US20070022919A1 - Low profile plastic pallet - Google Patents
Low profile plastic pallet Download PDFInfo
- Publication number
- US20070022919A1 US20070022919A1 US11/358,362 US35836206A US2007022919A1 US 20070022919 A1 US20070022919 A1 US 20070022919A1 US 35836206 A US35836206 A US 35836206A US 2007022919 A1 US2007022919 A1 US 2007022919A1
- Authority
- US
- United States
- Prior art keywords
- pallet
- deck
- inches
- less
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000004033 plastic Substances 0.000 title claims description 46
- 229920003023 plastic Polymers 0.000 title claims description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 53
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 27
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims description 29
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 5
- -1 polypropylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 9
- 239000006096 absorbing agent Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000002023 wood Substances 0.000 description 6
- 239000003063 flame retardant Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 229910000788 1018 steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229930091051 Arenine Natural products 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 238000012888 cubic function Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002843 nonmetals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000006269 thermoset foam Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 235000012773 waffles Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D19/0004—Rigid pallets without side walls
- B65D19/0053—Rigid pallets without side walls the load supporting surface being made of more than one element
- B65D19/0055—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface
- B65D19/0057—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element
- B65D19/0059—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element forming a continuous plane contact surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D19/0004—Rigid pallets without side walls
- B65D19/0053—Rigid pallets without side walls the load supporting surface being made of more than one element
- B65D19/0055—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface
- B65D19/0057—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element
- B65D19/0061—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element forming discontinuous or non-planar contact surfaces
- B65D19/0063—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element forming discontinuous or non-planar contact surfaces and each contact surface having a stringer-like shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D19/0004—Rigid pallets without side walls
- B65D19/0053—Rigid pallets without side walls the load supporting surface being made of more than one element
- B65D19/0077—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces
- B65D19/0079—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces the base surface being made of a single element
- B65D19/0081—Rigid pallets without side walls the load supporting surface being made of more than one element forming discontinuous or non-planar contact surfaces the base surface being made of a single element forming a continuous plane contact surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00014—Materials for the load supporting surface
- B65D2519/00024—Metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00014—Materials for the load supporting surface
- B65D2519/00034—Plastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00014—Materials for the load supporting surface
- B65D2519/00044—Combination, e.g. different elements made of different materials, laminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00049—Materials for the base surface
- B65D2519/00069—Plastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00084—Materials for the non-integral separating spacer
- B65D2519/00104—Plastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00009—Materials
- B65D2519/00119—Materials for the construction of the reinforcements
- B65D2519/00129—Metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00263—Overall construction of the pallet
- B65D2519/00273—Overall construction of the pallet made of more than one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00283—Overall construction of the load supporting surface
- B65D2519/00288—Overall construction of the load supporting surface made of one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00283—Overall construction of the load supporting surface
- B65D2519/00293—Overall construction of the load supporting surface made of more than one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00313—Overall construction of the base surface
- B65D2519/00318—Overall construction of the base surface made of one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00313—Overall construction of the base surface
- B65D2519/00323—Overall construction of the base surface made of more than one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00313—Overall construction of the base surface
- B65D2519/00328—Overall construction of the base surface shape of the contact surface of the base
- B65D2519/00333—Overall construction of the base surface shape of the contact surface of the base contact surface having a stringer-like shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00313—Overall construction of the base surface
- B65D2519/00363—Overall construction of the base surface grid type, e.g. perforated plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00368—Overall construction of the non-integral separating spacer
- B65D2519/00373—Overall construction of the non-integral separating spacer whereby at least one spacer is made of one piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00368—Overall construction of the non-integral separating spacer
- B65D2519/00388—Cell type, e.g. honeycomb
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00368—Overall construction of the non-integral separating spacer
- B65D2519/00393—Overall construction of the non-integral separating spacer grid type, e.g. perforated plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00398—Overall construction reinforcements
- B65D2519/00402—Integral, e.g. ribs
- B65D2519/00407—Integral, e.g. ribs on the load supporting surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00398—Overall construction reinforcements
- B65D2519/00402—Integral, e.g. ribs
- B65D2519/00417—Integral, e.g. ribs on the non-integral separating spacer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00398—Overall construction reinforcements
- B65D2519/00432—Non-integral, e.g. inserts
- B65D2519/00437—Non-integral, e.g. inserts on the load supporting surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00398—Overall construction reinforcements
- B65D2519/00432—Non-integral, e.g. inserts
- B65D2519/00442—Non-integral, e.g. inserts on the base surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00258—Overall construction
- B65D2519/00398—Overall construction reinforcements
- B65D2519/00432—Non-integral, e.g. inserts
- B65D2519/00447—Non-integral, e.g. inserts on the non-integral separating spacer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00547—Connections
- B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
- B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00547—Connections
- B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
- B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements
- B65D2519/00562—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements chemical connection, e.g. glued, welded, sealed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00547—Connections
- B65D2519/00552—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer
- B65D2519/00572—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer with separate auxiliary element, e.g. screws, nails, bayonets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00736—Details
- B65D2519/00825—Finishing of the external surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
- B65D2519/00004—Details relating to pallets
- B65D2519/00736—Details
- B65D2519/0086—Protection against environmental hazards, e.g. humidity, bacteria, fire
Definitions
- the present invention relates to plastic pallets, particularly those used for transporting miscellaneous industrial and commercial goods by means of forklift devices and the like.
- Rectangular wood pallets have been long used with forklift devices for transporting and storing common goods. They have been attractive because of simplicity and low cost. However, wood pallets are prone to damage during use, and constantly must be replaced or discarded. They also are difficult to keep clean. In recent years plastic pallets have been commercially available. They would seem to offer a number of potential advantages over wood pallets, including better durability, moisture resistance, and other known advantages of a polymer material, compared to wood. Plastic pallets have most often been made of familiar polyolefin thermoplastics; some other polymers have been used, particularly for fire-resistance. However, plastic pallets have not gained wide acceptance, for a number or reasons, which can be stated briefly as relating to a failure to satisfactorily meet all of a variety of criteria, including mechanical performance, weight, cost, and fire resistance.
- a plastic pallet which can be made in the present invention, is often referred in the U.S. to as a GMA pallet. It has a rectangular base, eight columns running up from the periphery of the base, and a rectangular deck. The pallet is in the shape of a 40 inch ⁇ 48 inch rectangle.
- a comparable European pallet is a 1000 mm by 1200 mm pallet, sometimes called a CP-1 pallet. For such pallets to become accepted for widespread use in commerce, they must meet various technical and performance standards.
- the Grocery Manufacturers of America (GMA), Washington, D.C., U.S. in conjunction with other organizations, has published a document entitled “Recommendations on the Grocery Industry Pallet System” (1992).
- the height must be less about 5.56 inches or less.
- the pallet must allow four-way entry by forks, and each side must have two openings which are at least 3.1 to 3.8 inches high and 12 to 12.5 inches wide.
- the pallet should weigh less than 55 pounds.
- the pallet has to be “rackable.” By that is meant, among other things, that the pallet must be capable of being held on open beam warehouse racks without failing or exceeding a specified amount of creep deformation when loaded.
- plastic pallets of the size and type described have not been able to simultaneously meet all of the performance criteria for an acceptable cost and weight. Thus, they have not substantially replaced widely used wood pallets. It is an aim of the invention to do better.
- decks appear to have been mostly made from sheet or injection molded plastic. Typically, decks are permanently attached to the other parts of the pallet, although sometimes they have been mechanically and detachably assembled. Often the decks have many openings and ribs for lightness and drainage, which present large surface areas and adversely affect fire test performance.
- thermoplastics combined with the high surface area of plastic decks and other parts, have meant that the rate of heat evolution during a fire is much greater than allowed by the UL 2335 standard.
- fire retardants have been included within the plastics to address the issue, it has been difficult for plastic pallet makers to meet the standard while meeting the other requirements.
- the fire retarding additives can compromise mechanical properties, increase cost and weight, and introduce environmental problems.
- An object of the invention is to provide a plastic pallet which has a desirable combination of properties that meet industry requirements which include racking creep strength, maximum weight, minimum size of openings for fork lift devices, and fire test performance.
- a further object of the invention is to reduce the cost of shipping empty pallets by reducing the height of pallets below that which is required by the industry standards.
- a 40 inch by 48 inch rectangular thermoplastic pallet comprises a base having beam-reinforced thermoplastic outer rails, cross rails which connect the outer rails, hollow plastic columns, including a center column, running upwardly from the base, a thermoplastic frame attached to the tops of the outer columns, and a corrugated metal deck which is fastened to the frame or a subframe which is within the frame.
- the deck is inset from the outer edge of the top and preferably the frame comprises impact absorbers and metal stays.
- the pallet has eight openings which are at least 3.2 inches high and 12.5 inches wide, to provide four-way entry for fork lifting devices.
- the reinforcing beams are preferably steel.
- the deck is preferably a corrugated aluminum alloy sheet, with at least three corrugations running substantially parallel to a line connecting diagonally opposed comers of the deck. In an embodiment of pallet, the deck area is at least 75 percent of the total area of the pallet top.
- the pallet weighs less than 55 pounds and is comprised of 30-45 percent metal by weight.
- the use of the metal deck and avoidance of metal beams in the top of the pallet enables the deck to be made unusually thin compared to the prior art.
- the deck is less than about 15 percent of the height of the pallet.
- the metal deck also enables reduction in the height of the beams, and thus of the rails, in the base. Thus, the height of the fork openings is more than 60 percent of the height of the pallet.
- the unique combination of elements provides a pallet with a height which is significantly less than the maximum 5.56 inches industry requirement, while still meeting the multiplicity of other criteria necessary for commercial acceptance as a GMA pallet, including weight, configuration, structural strength and fire test performance.
- Pallets of the invention have heights less than 5.4 inches, as low as 4.9 inches.
- the pallets have a density property of stacked pallets, wherein the stacking density is greater than 2.2, preferably less than 2.3 pallets per vertical foot.
- the number of pallets which can be contained within a stack of a given height can be increased by twenty percent or more, as can the number of pallets carried on a standard size truck, so the shipping cost for each empty pallet can be significantly reduced.
- FIG. 1 is an isometric view of a quarter section of a pallet.
- FIG. 2 is a vertical cross section through the outer edge and part of the deck of the pallet of FIG. 1 .
- FIG. 3 is like FIG. 2 , showing another embodiment pallet deck attachment.
- FIG. 4 shows in vertical section part of the top outer edge of a pallet, where the deck is attached by means of plastic nubs.
- FIG. 5 is a vertical cross section of the top outer edge of a pallet, where the deck is attached by means of a rail having integral pins.
- FIG. 6 shows in vertical section part of the top outer edge of a pallet, where the deck is encapsulated with thermoplastic.
- FIG. 7 is an isometric view of a quarter of a rectangular pallet having diagonal corrugations.
- FIG. 8 is a top view of the pallet, showing continuous corrugations which run parallel to a line L connecting diagonally opposing comers of the pallet.
- FIG. 9 is a vertical cross section through a portion of a corrugated deck showing the shape of the corrugations.
- FIG. 10 is like FIG. 9 and shows different contour corrugations.
- FIG. 11 is a graph comparing the mechanical behavior of decks having different corrugation patterns.
- FIG. 12 is like FIG. 2 , showing a vertical cross section portion of a pallet having metal beams, for describing pallet vertical dimensions.
- FIG. 13 is an isometric view of a quadrant of a pallet having a deck mounted on a suspension system which comprises a subframe.
- FIG. 14 is an exploded view of the pallet of FIG. 13 .
- FIG. 15 is a graph of pallet stacking density as a function of pallet height.
- the invention is mostly described in terms of a preferred embodiment pallet, having the dimensions of a GMA pallet.
- the invention will be useful in non-GMA pallets.
- the present invention is aimed at meeting particular mechanical requirements, along with the fire test requirements of UL Standard 2335, while minimizing the use of fire retardants.
- a predominately thermoplastic pallet has a combination of metal beams in the base and a textured, preferably a metal, deck.
- a metal deck enables avoiding the use of reinforcing beams in the top. That aspect is described first. There is an advantage to having corrugations which having specified orientations and dimensions. That is described next.
- a GMA pallet has the property of uniquely high stacking density. That is described last.
- a pallet of the present invention pallet may be molded-in components and subassemblies, preferably by injection molding using gas assistance. See U.S. Pat. No. 5,401,459.
- the several parts or subassemblies may be joined as an assembly by known thermoplastic fabrication methods, for example, by mechanical means, by hot plate welding, vibratory welding, or ultrasonic welding. See, for instance, U.S. Pat. Nos. 6,250,234 and 6,283,044.
- the thermoplastic parts of the pallet may be made of commercial grade polypropylene, high density polyethylene or other polyolefin. Other plastics, including thermosets and engineered plastics, may be used for the parts of the pallet.
- FIG. 1 is an isometric view of a quadrant portion of pallet 20 which has a rectangular base 30 . It is useful and illustrates many principles of the invention.
- the pallet 320 described below, is more complex and more preferred.
- Frame 24 is supported by the eight columns 28 which are at the rectangular periphery of the pallet.
- a frame is by definition a rectangular structure with an interior opening; and the interior opening is spanned by the deck.
- Formed aluminum sheet metal deck 22 is attached to frame 24 .
- Base 30 is comprised of four outside rails 31 which form a rectangle that corresponds with the shape of frame 24 .
- Two cross rails 33 connect the opposing centers of the outside rails; they cross each other at the center of the pallet.
- Center column 29 is at the cross rail intersection and deck 22 is fastened to the top of the center column.
- the openings 34 , between adjacent columns 28 have a width and height which enables “four-way” fork entry for lifting and transport and which meet industry dimensional requirements.
- Metal beams 74 are embedded within the rails 31 , 33 of base 30 . See also the vertical cross section of FIG. 2 .
- the metal beams provide strength and stiffness to the base of the pallet, so that the pallet can be stored in a rack which has spaced apart rack supports, and so the pallet can endure other specified loads.
- Beams are incorporated within the frame in accord with the teachings of U.S. Pat. Nos. 6,705,237 of Moore et al., 6,955,128 of Apps et al., and 5,868,080 of Wyler et al., the disclosures of which are hereby incorporated by reference.
- the beams are preferably configured so that during a fire the embedded beams, and the pallet, collapse when the burning thermoplastic softens. See the related application entitled “Fire collapsible beamed pallet,” bearing Atty. No. EPC-2443 filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference.
- the construction of the deck and its attachment to the thermoplastic parts of the pallet are features of the invention.
- the deck has texturing which provides the sheet material with strength sufficient to both carry a load of goods and to impart strength to the pallet as a whole.
- a variety of ways for imparting stiffness to the deck sheet material may be used.
- RigidizedTM metal sheet may be used.
- the sheet may have a waffle pattern.
- the deck has a multiplicity of corrugations, and it is also made of metal, as described below.
- deck 22 of pallet 20 has corrugations running in several different directions, in accord with the corrugation pattern shown as Type B in FIG. 11 .
- the deck is made of 0.060 inch thick Type 5052 aluminum alloy sheet.
- the periphery of deck 22 comprises a flange 49 , as shown in FIGS. 1 and 4 , which is plain or un-textured and which and facilitates attachment to the frame.
- FIG. 3 through 6 show in vertical cross section some alternative deck attachments.
- FIG. 3 shows how deck 22 is pinned to the frame by screw or driven pin fasteners 36 .
- FIG. 4 shows a multiplicity of vertically extending projections or nubs, which are molded into the plastic frame when it is fabricated. After a deck with mating holes is placed on the frame, the nubs are headed, or flattened over, as indicated by the arrows and phantom in FIG. 4 .
- the deck and frame have holes, to receive the stakes of a metal or plastic rail 40 , which is pressed down onto the frame to capture the flange of the deck.
- deck 22 is first encapsulated in whole or part by a layer 340 of thermoplastic, using commercial processes. Then, the layer is plastic-welded to the frame, for instance by ultrasonic, vibratory or hot plate welding.
- This embodiment can provide a good seal between the deck and the frame. See a related application entitled “Plastic pallet with sealed deck to frame joint”, bearing Atty. No. EPC-2442, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference.
- the outer edge of the deck may be mechanically captured within the frame during the molding of the frame.
- FIG. 3 shows a corrugated deck 22 which has no flange and which is not inset from the outer edge of the frame; the deck covers the entire top of the pallet.
- the edges of a metal deck are inset from, or inwardly spaced apart from, the outside edge of the frame by a distance D, as shown in FIGS. 1 and 2 .
- a distance D As shown in FIGS. 1 and 2 .
- the inset of the deck edge With the inset of the deck edge, a peripheral portion of the top of the frame is exposed.
- Distance D will be a design choice, according to the character of the exposed part the frame and anticipated impacts.
- D is preferably the same for all edges, at about 1-3 inches for a GMA size pallet. D may be different at different sides of the pallet. In the pallet 120 embodiment discussed below, D is preferably about 4-5 inches. Thus for a 40 ⁇ 48 GMA pallet the deck area will be at least about 75 percent of total area of the top of the pallet. When the deck is metal, fire test performance is much improved due to the lessening of the quantity and surface area of combustible plastic in the pallet.
- the frame may be constructed in a manner which is familiar to those making ordinary injection molded structural beams.
- it may be shaped like a C-channel; it may have lightening pockets and ribs, etc.
- the bridge parts 25 of the frame 24 are less conventionally constructed, and they have one or more lengthwise compliant zones which comprise an impact absorber. 26 .
- a bridge is that portion of a frame which spans the space between adjacent columns 28 .
- One type of impact absorber 26 is shown in FIG. 1 and FIG. 2 ; another is shown in FIG. 7 .
- the impact absorber comprises two parallel rows of open cells bounded by lengthwise and transverse ribs near the outer edge 27 of bridge 25 .
- the bridge comprises a third lengthwise zone, namely, the innermost portion of the bridge, where deck 22 is attached. See FIG. 6 . That portion is not designed for impact absorption and is of conventional structural plastic design. Thus, when horizontally impacted, the outer portion of the bridge 25 is more complaint, or less stiff and therefore more deformable, than is the innermost part of the bridge. The outer portions absorb the force of a horizontal impact and the inner portion does not appreciably move. Impact absorber construction is described more particularly in the related application entitled “Plastic pallet with sealed deck to frame joint,” bearing Atty. No. EPC-2442, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference.
- Rectangular cross section beams 74 in the rails 31 , 33 of the base 30 are made of sheet metal.
- 0.059 inch thick AISI 1040 steel having yield strength of at least 80,000 pounds per square inch, may be used.
- 0.090 inch thick cold rolled AISI 1018 steel having a Rockwell B hardness of 60-65 may be used.
- the vertical height (or depth) of the beams is about 0.7 inch, when a metal deck is used.
- the texturing of deck 122 of pallet 120 comprises parallel corrugations 45 which run at an angle to the edges of the deck and pallet. While a GMA pallet 120 preferably has an aluminum alloy sheet metal deck, as described above, the corrugation pattern invention may be employed other pallets having non-metal decks.
- Flange 149 of deck 122 is attached to the frame 124 of the pallet by means of screw or stake fasteners, or in other ways mentioned above.
- the center of the deck is fastened to the top of center column 129 .
- Deck 122 has a multiplicity of corrugations 45 which, when viewed in a vertical cross section, comprise valleys 41 and peaks 47 .
- Some exemplary corrugation cross section patterns are shown in the vertical cross section decks of FIG. 9 and FIG. 10 .
- the tops of peaks 47 and the bottoms of valleys 41 of deck 122 are substantially flat and parallel to the top of the frame; and, the peaks and valleys are connected by webs running at a nominal 45 degree angle to the horizontal.
- the pitch, P, or center to center spacing, of the corrugations is about 2 inches.
- Depth DP is the effective depth of the deck; and is nominally the depth of the valleys. All valleys are preferably of uniform depth and provide the deck with an effective depth of about 0.5 inches.
- FIG. 10 shows the corrugation cross section of alternate embodiment deck 122 A which has peaks 45 A and valleys 47 A running along a nominally sinusoidal path.
- Other dimension corrugations may be used, including those in which the corrugations vary in width or pitch.
- Depth DP may vary from valley to valley and along the length of any valley.
- the bottoms of the valleys preferably have spaced-apart drain holes, visible in FIG. 1 and FIG. 13 , to make fire sprinkler water drop onto the underlying cross rails, for helping performance in fire tests. See related application entitled “Fire sprinkler-friendly pallet,” bearing Atty. No. EPC-2440, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference.
- decks are formed from flat sheet using conventional metalworking techniques, including cold forming, press forming, drawing, etc. Especially when there is a flat flange, the deck may be conceived as a flat sheet into which valleys 41 have been pressed. Thus, in the following discussion a reference to a corrugation may be considered interchangeably to refer to a valley.
- FIG. 8 is a top view of pallet 120 and illustrates the lay of the lengthwise axes 53 of the corrugations.
- all the corrugations of deck 120 run parallel to L, the line running between the intersects of the edges at two diagonally opposed comers.
- L will also be the diagonal of the frame and pallet as a whole.
- Line L of the deck will not be coincident with the corresponding diagonal of the frame or pallet when the rectangle of the deck is not congruent with the rectangle of the pallet.
- the line L lies at an angle B of about 40 degrees to the longer edge of the frame 124 .
- Angle A is about 10 degrees, preferably 3 degrees. If a deck is deviant from a perfect rectangle shape, L will be the diagonal of a best fit rectangle. The invention will be useful with patents which are square. When it is said corrugations are parallel, that means they are substantially parallel, and there may be small deviations from exact parallelism between adjacent corrugations.
- FIG. 11 graphically illustrates the surprising advantage in performance for certain deck corrugation patterns, as revealed by finite element analysis (FEA) of decks which were subject to the same uniform loads.
- FEA finite element analysis
- decks were assumed to be made of 0.050 inch Type 5052 aluminum alloy sheet. All corrugations had the same width, depth and the cross section shape which is shown in FIG. 9 . Thus, only the orientations of the corrugations were changed, from one type deck to another, in the analysis.
- the icons in FIG. 11 are simplified top view sketches of pallet decks, to show the different deck corrugation patterns of the analysis.
- the decks in the FEA were analyzed when supported in two different ways. First, the pallet was supported at the opposing 48 inch length sides, or in the so-called “long direction” (the data for which is represented by circle symbols). Second, the pallet was supported at the opposing 40 inch length sides, or in the so-called “short direction” (the data for which is represented by circle symbols). In FIG. 11 , those two different support modes are indicated by stating the span between the supports, e.g., a span of 40 inches means the deck was supported along the 49 inch sides.
- the comparative FEA deformations of different configurations of decks were determined. Those data are represented in the graph by the open symbols. Maximum elastic stress in the deck was calculated according to Von Mises theory and criteria.
- the Von Mises analysis data are represented by solid symbols. A deck having better strength will have lower deflection and lower Von Mises values, when performance in both directions of support is considered. The comparative deflection performance of some of the patterns was confirmed in testing of prototype decks and pallets.
- Decks of type INV and type I have surprising advantage over the other patterns, and they are preferred embodiments of the present invention.
- type INV all the corrugations run parallel to L, the diagonal.
- the associated data set is marked by the box 80 .
- Deck of type I, with which is associated data set 90 is only somewhat inferior to the most preferred embodiment type INV.
- a deck of type B provides inferior performance, compared to what artisan intuition about its symmetry might suggest. In fact, such pattern was used on early prototypes.
- the long direction corrugations which characterize type III deck give the deck excellent results in one span-support direction and quite inferior results in the other span-support direction.
- the type II deck has similar but somewhat lesser inadequacy.
- Type I and type INV decks are characterized by at least three corrugations running continuously and parallel to the diagonal line of the deck.
- Type I deck has a second set of three corrugations, namely those running along the other diagonal of the pallet.
- the corrugations of the second set are discontinuous where their path crosses the first set of corrugations.
- Type I has in addition 4 to 6 valleys which run parallel to the each of the rectangular edges of the deck.
- type IA not shown, the configuration is like type I: A first set of at least 3 corrugations is parallel to a first diagonal line of the deck; and, all the other corrugations on the deck are parallel to the second diagonal.
- a type I deck is less preferred than a type INV deck, but both are substantially superior to other types of texturing.
- one corrugation valley is centered on line L, and there are two or more parallel valleys on either side of the primary valley.
- the two adjacent the primary valley have only a little shorter than the primary valley length.
- the term “corner” as applied to this aspect of the invention is to be interpreted as embracing a region of the deck, rather than a point.
- the three corrugations nearest line L run to the corners, even though the outer portion of the corner near the edge intersect is an un-textured flange. While the analysis simulated a metal deck, the invention will be useful with decks which are made of non-metals. Logic suggests that two, or even one, continuous diagonal corrugations would suffice, although providing less strength but that has not yet been proved.
- each corrugation provides strength to the edge of the deck, and helps inhibits bending of the deck about the length axis of the corrugation at the deck edge.
- the combination of features of the invention provides another unexpected advantage, namely, a heretofore unattainable low profile, or total height, for a pallet which meets the many requirements which have been mentioned above for a GMA pallet.
- a heretofore unattainable low profile, or total height for a pallet which meets the many requirements which have been mentioned above for a GMA pallet.
- FIG. 12 is used to illustrate dimensions associated with pallets.
- FIG. 12 is analogous to FIG. 2 and shows a vertical cross section of a simplified prior art pallet 220 having metal beams 275 , 274 , respectively in the top and base.
- the fork opening 234 (also sometimes called the window) must have a height FO of at least 3.1 inches and a width WO of at least 12.5 inches wide.
- the hollow square AISI 1018 steel beams 275 , 274 have a vertical height of about 0.875 inches. That produces a base rail height DB of about 1.1 inches.
- the top frame has a similar beams and similar height DT.
- the resultant total height of the pallet is near the maximum 5.56 inch height allowed.
- the present invention which comprises a corrugated metal deck, in particular an aluminum deck, having the corrugations of Type INV or Type I, enables both omitting metal beams in the top and reducing the height of the beams in the base, while meeting the dimensional, load bearing and weight requirements attending a GMA pallet. Leaving the beam out of the top means the top can be made thinner than heretofore has been possible.
- a top frame height DT of about 0.7 inches is achieved.
- the effective height of the deck is 0.5 inches, and that fits easily within the frame profile.
- the corrugated deck is sufficiently stiff and supported at the center column. Thus, when it deflects under a load of goods, it does not deflect below the elevation of the bottom of the frame.
- the strong metal deck and thermoplastic elements of the top cooperate with the base to provide good racking strength.
- the pallet construction enables a reduction in the size of the beams used in the base.
- the vertical height (also called “depth”) of the steel beams in the base of a preferred embodiment pallet is about 0.5 inches, which is about 60% of the previously required beam height of 0.875 inches.
- the thicknesses of both the top and both parts of the pallet are thinner than was heretofore possible.
- the use of the corrugated metal deck enables a surprising and significant reduction in height and associated stacking density, compared to what could be done in the past.
- Exemplary pallets of the invention have heights of less than 5.4 inches. In a preferred embodiment a pallet is 4.7 to 4.9 inches high. As a fraction of the height of the pallet, the required minimum 3.1 inch fork opening height is more than about 60 percent; the 0.7 inch top height is less than about 15 percent; and the 0.9 inch base height is less than about 20 percent. Those percentages are a measure of the efficiency and uniqueness of the design.
- FIG. 13 A quadrant of an exemplary pallet 320 which has features of the present invention is shown in FIG. 13 .
- the exploded view of FIG. 14 shows how it is constructed.
- pallet 320 has most elements like those previously described.
- the corrugated deck is of the type INV and all the corrugations are parallel to the deck diagonal.
- Pallet 320 is different from other embodiments described up to this point in the following way:
- the deck 322 is attached to a subframe 66 which is supported within the frame by attachment to cantilever brackets 68 , 78 .
- the deck is also fastened to center column 329 which preferably has vertical fins on top rather than a mirror-fit corrugation contour pattern.
- the subframe 66 and attached deck are spaced apart from the inner edge 72 of the frame.
- each bridge 325 has impact absorber construction across its whole width. Since the edge of the deck is spaced apart from the inner edge of the bridge, the bridge can deform compliantly and inwardly under horizontal impact loads without damaging the deck.
- the construction of the pallet of FIG. 13 is further described in a patent application entitled “Plastic pallet having impact resisting top”, bearing Atty. No. EPC-2437, and an application entitled “Plastic pallet having deck suspension system”, bearing Atty. No. EPC-2439, both filed on even date herewith by R. Moore et al., the disclosures of which is hereby incorporated by reference.
- a pallet of the present invention like that shown in FIG. 13 , when made of polypropylene or comparable density plastic, and when having corrugated aluminum alloy deck and steel beams only in the base, is by weight about 30-45 percent metal, balance thermoplastic.
- the metal is about 32-40 weight percent.
- the preferred embodiment pallet is approximately 90 percent plastic. Therefore, on both bases, the invention pallet is characterized as predominately plastic.
- the total weight is about less than 55 pounds, preferably about 51 pounds, according to the particular height.
- the aluminum deck weighs about 6 lb. and the steel reinforcing beams weigh about 12.5 lb., which are respectively about 11-12% and 23-25% of the total pallet weight.
- Such pallet is 34-37% percent metal by weight.
- Some or all of the metal parts may be replaced by non-metal parts, such as with engineered plastics or ceramics which provide comparable section moduli and strengths to the metal parts.
- the new technology makes possible the construction of GMA-load rated pallets which are predominately plastic, but at the same time they have a total height which is 10-15% less than GMA-rated pallets in the prior art.
- a pallet which has a 4.7 inch height has about 15% less height than a 5.56 inch high prior art pallet. That means that about 20% more pallets can be carried within the volume of a typical large truck or other vehicle, which is explained now.
- a typical stack of pallets for carrying within a familiar U.S. over-the-road enclosed semi-trailer cannot exceed about 109 inch. Obviously, if the remaining space above an uppermost pallet is less than the height of a full pallet, that space must remain empty. In the invention, a stack of 23 most preferred embodiment 4.7 inch high pallets will be about 108 inches high. A stack of 19 prior art 5.56 inch pallets will be about 106 inches high. Normalizing those numbers, a stack of 5.56 inch pallets has a vertical density of 2.15 pallets per foot. In the invention, the most preferred embodiment 4.7 inch high pallet has a stack density of 2.55 pallets per foot. Table 1 shows data for different models, or embodiments of the invention. The pallet height and density data of Table 1 are plotted in FIG. 15 . When certain cost considerations are weighed, the design Model A, having a 4.9 inch height, is most preferred at the present time; and a substantial advantage is obtained.
- Prototype GMA pallets which had the features of most preferred embodiments of the invention passed the test of UL 2335.
- the pallets were made of polypropylene containing fire retardants and had a corrugated aluminum deck with drain holes over the base rails, collapsible steel beams in the base rails, and thermoset foam within the hollows of the columns.
- the 5052 aluminum alloy has an elastic modulus in tension of 10.3 ⁇ 10 6 psi (7.1 ⁇ 10 4 MPa) and a specific stiffness of about 105 ⁇ 10 6 inch (26 ⁇ 10 5 m).
- AISI 300 series stainless steel may be used.
- Such steel alloy has about three times the density of the aluminum alloy, but it also has an elastic modulus which is about three times that of the aluminum alloy.
- the two classes of metals have about the same specific stiffness.
- the steel deck could be about one-third of the thickness of an aluminum deck.
- a deck may alternately be made of any of a number of steels which have mechanical properties comparable to the 300 series stainless steels.
- a deck may be made of alloys of magnesium or titanium, although they have poor fire test characteristics.
- Sheet of fiber reinforced thermoset plastic may be used.
- Pallets may be alternately constructed using beams which are not metal, such as those made of graphite or glass or metal fibers.
- the rails of bases may be constructed wholly of engineered plastics.
- thermoplastic or “thermoplastic,” unless qualified, the term does not exclude the presence of other materials such as metal reinforcing members, fillers, fibers, fire retardants, and the like; and it means that the pallet is mostly or predominately plastic or thermoplastic, as applies.
- a thermoplastic pallet or member may also be comprised of lesser fraction thermoset and or elastomer materials. Such terminology compares to a reference to a wholly or purely plastic or thermoplastic pallet or article.
- commercially available fire retardants are ordinarily included with thermoplastics, to help meet the UL 2335 requirements, as is known in the art.
- the base of a pallet may have cross rails which run in a different pattern from that described.
- the cross rails may run between diagonally opposed corners.
- the cross rails may be wholly metal.
- the columns might be wholly or part metal.
- a corrugated deck of the invention can be used with pallets which have no reinforcing beams in the base, or with pallets which have no base rails, but which are supported by resting the lower ends of the columns on a flat surface, in which case the columns might more accurately be called feet.
- the inventions will be useful as improvements for pallets which are not GMA dimensioned or structurally rated.
- the deck corrugation patterns can be used in other pallets having sheet material decks, including where the deck material is any kind of plastic, including engineered plastics, such as those reinforced with graphite fibers and fiberglass.
- the invention may be applied to wholly plastic pallets and pallets having wood bases.
Abstract
A predominately thermoplastic pallet, for use with a fork lift device, is provided and includes a rectangular base including rails having metal reinforcing beams, eight spaced apart outer columns extending upwardly from the outer rails and one center column extending upwardly from the center of the base. The pallet also includes a top including a rectangular thermoplastic frame and a corrugated sheet metal deck, wherein the frame is attached, to the tops of the outer columns and wherein the deck is inset from the outer edge of the frame and wherein the pallet has dimensions and properties which include outside dimensions of about 40 inches by about 48 inches, two forklift device openings on each side of the pallet, each of which are at least 3.1 inches high and 12 inches wide and a pallet height or 5.56 inches or less.
Description
- This application claims benefit of provisional patent applications Ser. Nos. 60/654,760, 60/654,761, 60/654,765, and 60/654,768, all filed Feb. 18, 2005.
- The present invention relates to plastic pallets, particularly those used for transporting miscellaneous industrial and commercial goods by means of forklift devices and the like.
- Rectangular wood pallets have been long used with forklift devices for transporting and storing common goods. They have been attractive because of simplicity and low cost. However, wood pallets are prone to damage during use, and constantly must be replaced or discarded. They also are difficult to keep clean. In recent years plastic pallets have been commercially available. They would seem to offer a number of potential advantages over wood pallets, including better durability, moisture resistance, and other known advantages of a polymer material, compared to wood. Plastic pallets have most often been made of familiar polyolefin thermoplastics; some other polymers have been used, particularly for fire-resistance. However, plastic pallets have not gained wide acceptance, for a number or reasons, which can be stated briefly as relating to a failure to satisfactorily meet all of a variety of criteria, including mechanical performance, weight, cost, and fire resistance.
- A plastic pallet, which can be made in the present invention, is often referred in the U.S. to as a GMA pallet. It has a rectangular base, eight columns running up from the periphery of the base, and a rectangular deck. The pallet is in the shape of a 40 inch×48 inch rectangle. A comparable European pallet is a 1000 mm by 1200 mm pallet, sometimes called a CP-1 pallet. For such pallets to become accepted for widespread use in commerce, they must meet various technical and performance standards. The Grocery Manufacturers of America (GMA), Washington, D.C., U.S., in conjunction with other organizations, has published a document entitled “Recommendations on the Grocery Industry Pallet System” (1992). From that and other references, the characteristics for a GMA pallet which are required for acceptance by large commercial users in the U.S. include the following: The height must be less about 5.56 inches or less. The pallet must allow four-way entry by forks, and each side must have two openings which are at least 3.1 to 3.8 inches high and 12 to 12.5 inches wide. The pallet should weigh less than 55 pounds. The pallet has to be “rackable.” By that is meant, among other things, that the pallet must be capable of being held on open beam warehouse racks without failing or exceeding a specified amount of creep deformation when loaded.
- “Recommended Test Protocol for Plastic Pallet,
Version 3” (1998) published by Virginia Tech, Blacksburg, Va., U.S., sets forth mechanical performance and test requirements for pallets including a warehouse racking test. ISO 8611:1991 and proposed Underwriters Laboratories (UL) Standard 2417 specify similar mechanical performance and testing standards. Pallets must also meet other standards. UL Standard 2335 specifies fire tests and performance for warehouse pallets made of plastic. To meet such fire test standard, pallets must not exceed a certain rate of heat release rate during a simulated warehouse fire. ANSI/NSF 2-1996, published by NSF and approved by American National Standards Institute, at Section 7, sets standards for pallets used in food service. Commercial purchasers have their own standards which are often somewhat more demanding. - In the past, plastic pallets of the size and type described have not been able to simultaneously meet all of the performance criteria for an acceptable cost and weight. Thus, they have not substantially replaced widely used wood pallets. It is an aim of the invention to do better.
- In the plastic pallets which have been commercially offered or described in patent literature, decks appear to have been mostly made from sheet or injection molded plastic. Typically, decks are permanently attached to the other parts of the pallet, although sometimes they have been mechanically and detachably assembled. Often the decks have many openings and ribs for lightness and drainage, which present large surface areas and adversely affect fire test performance.
- In order to have sufficient GMA strengths, the tops of pallets have had to be thick or have had to make use of metal beams, as described in various patents, including U.S. Pat. Nos. 5,868,080, 6,705,237, and 6,955,128. Beams, especially when they are encapsulated in plastic for protection, tend to increase the thickness, height and weight. Having a low pallet height, or low profile, is of interest for the following reason. Economics and current environmental concerns dictate that empty plastic pallets be exchanged, or returned to a source of goods for reuse Shippers want to pack as many empty pallets as possible on a truck or other transport vehicle, to reduce the shipping cost per pallet. Thus, it follows that the bigger the profile, the higher the cost of transporting a pallet.
- Despite the best efforts of engineers and designers, plastic pallets which seek to meet the GMA standards—with or without using beams, have tended to be at or beyond the user-specified maximum 5.56 inch height. Small height changes can have a powerful effect on pallet strength, since section modulus and therefore stiffness of any structure is a cubic function of section height.
- It has also been difficult for plastic pallet designers to meet the fire resisting requirements. The high energy content of thermoplastics, combined with the high surface area of plastic decks and other parts, have meant that the rate of heat evolution during a fire is much greater than allowed by the UL 2335 standard. While fire retardants have been included within the plastics to address the issue, it has been difficult for plastic pallet makers to meet the standard while meeting the other requirements. The fire retarding additives can compromise mechanical properties, increase cost and weight, and introduce environmental problems.
- Thus, there is a need for further improvements in the design and construction of plastic pallets, to meet the difficult goals mentioned above.
- An object of the invention is to provide a plastic pallet which has a desirable combination of properties that meet industry requirements which include racking creep strength, maximum weight, minimum size of openings for fork lift devices, and fire test performance. A further object of the invention is to reduce the cost of shipping empty pallets by reducing the height of pallets below that which is required by the industry standards.
- In accord with the invention, a 40 inch by 48 inch rectangular thermoplastic pallet comprises a base having beam-reinforced thermoplastic outer rails, cross rails which connect the outer rails, hollow plastic columns, including a center column, running upwardly from the base, a thermoplastic frame attached to the tops of the outer columns, and a corrugated metal deck which is fastened to the frame or a subframe which is within the frame. The deck is inset from the outer edge of the top and preferably the frame comprises impact absorbers and metal stays.
- The pallet has eight openings which are at least 3.2 inches high and 12.5 inches wide, to provide four-way entry for fork lifting devices. The reinforcing beams are preferably steel. The deck is preferably a corrugated aluminum alloy sheet, with at least three corrugations running substantially parallel to a line connecting diagonally opposed comers of the deck. In an embodiment of pallet, the deck area is at least 75 percent of the total area of the pallet top. The pallet weighs less than 55 pounds and is comprised of 30-45 percent metal by weight. When subjected to a uniform load of 2800 pounds for a period of 30 days at a temperature of 115° F., while being supported along the opposing 48 inch sides across a span of 45 inches, the center of the pallet deflects less than 0.8 inches, thus meeting an industry requirement for a so-called GMA pallet.
- The use of the metal deck and avoidance of metal beams in the top of the pallet, enables the deck to be made unusually thin compared to the prior art. The deck is less than about 15 percent of the height of the pallet. The metal deck also enables reduction in the height of the beams, and thus of the rails, in the base. Thus, the height of the fork openings is more than 60 percent of the height of the pallet.
- In further accord with the invention, the unique combination of elements provides a pallet with a height which is significantly less than the maximum 5.56 inches industry requirement, while still meeting the multiplicity of other criteria necessary for commercial acceptance as a GMA pallet, including weight, configuration, structural strength and fire test performance. Pallets of the invention have heights less than 5.4 inches, as low as 4.9 inches. The pallets have a density property of stacked pallets, wherein the stacking density is greater than 2.2, preferably less than 2.3 pallets per vertical foot. The number of pallets which can be contained within a stack of a given height can be increased by twenty percent or more, as can the number of pallets carried on a standard size truck, so the shipping cost for each empty pallet can be significantly reduced.
- The foregoing and other objects, features and advantages of the present invention will become more apparent from the following description of preferred embodiments and accompanying drawings.
-
FIG. 1 is an isometric view of a quarter section of a pallet. -
FIG. 2 is a vertical cross section through the outer edge and part of the deck of the pallet ofFIG. 1 . -
FIG. 3 is likeFIG. 2 , showing another embodiment pallet deck attachment. -
FIG. 4 shows in vertical section part of the top outer edge of a pallet, where the deck is attached by means of plastic nubs. -
FIG. 5 is a vertical cross section of the top outer edge of a pallet, where the deck is attached by means of a rail having integral pins. -
FIG. 6 shows in vertical section part of the top outer edge of a pallet, where the deck is encapsulated with thermoplastic. -
FIG. 7 is an isometric view of a quarter of a rectangular pallet having diagonal corrugations. -
FIG. 8 is a top view of the pallet, showing continuous corrugations which run parallel to a line L connecting diagonally opposing comers of the pallet. -
FIG. 9 is a vertical cross section through a portion of a corrugated deck showing the shape of the corrugations. -
FIG. 10 is likeFIG. 9 and shows different contour corrugations. -
FIG. 11 is a graph comparing the mechanical behavior of decks having different corrugation patterns. -
FIG. 12 is likeFIG. 2 , showing a vertical cross section portion of a pallet having metal beams, for describing pallet vertical dimensions. -
FIG. 13 is an isometric view of a quadrant of a pallet having a deck mounted on a suspension system which comprises a subframe. -
FIG. 14 is an exploded view of the pallet ofFIG. 13 . -
FIG. 15 is a graph of pallet stacking density as a function of pallet height. - The invention is mostly described in terms of a preferred embodiment pallet, having the dimensions of a GMA pallet. The invention will be useful in non-GMA pallets. As detailed further below, the present invention is aimed at meeting particular mechanical requirements, along with the fire test requirements of UL Standard 2335, while minimizing the use of fire retardants.
- In one aspect of the invention, a predominately thermoplastic pallet has a combination of metal beams in the base and a textured, preferably a metal, deck. A metal deck enables avoiding the use of reinforcing beams in the top. That aspect is described first. There is an advantage to having corrugations which having specified orientations and dimensions. That is described next. By using the special combination of features a GMA pallet has the property of uniquely high stacking density. That is described last.
- A pallet of the present invention pallet may be molded-in components and subassemblies, preferably by injection molding using gas assistance. See U.S. Pat. No. 5,401,459. The several parts or subassemblies may be joined as an assembly by known thermoplastic fabrication methods, for example, by mechanical means, by hot plate welding, vibratory welding, or ultrasonic welding. See, for instance, U.S. Pat. Nos. 6,250,234 and 6,283,044. The thermoplastic parts of the pallet may be made of commercial grade polypropylene, high density polyethylene or other polyolefin. Other plastics, including thermosets and engineered plastics, may be used for the parts of the pallet.
-
FIG. 1 is an isometric view of a quadrant portion ofpallet 20 which has arectangular base 30. It is useful and illustrates many principles of the invention. Thepallet 320, described below, is more complex and more preferred. There are nine columns which run upwardly from the rectangular base.Frame 24 is supported by the eightcolumns 28 which are at the rectangular periphery of the pallet. There are four comer columns and four columns at the midpoint of each side of the pallet. A frame is by definition a rectangular structure with an interior opening; and the interior opening is spanned by the deck. Formed aluminumsheet metal deck 22 is attached to frame 24.Base 30 is comprised of fouroutside rails 31 which form a rectangle that corresponds with the shape offrame 24. Two cross rails 33 connect the opposing centers of the outside rails; they cross each other at the center of the pallet.Center column 29 is at the cross rail intersection anddeck 22 is fastened to the top of the center column. Theopenings 34, betweenadjacent columns 28 have a width and height which enables “four-way” fork entry for lifting and transport and which meet industry dimensional requirements. - Metal beams 74 are embedded within the
rails 31, 33 ofbase 30. See also the vertical cross section ofFIG. 2 . The metal beams provide strength and stiffness to the base of the pallet, so that the pallet can be stored in a rack which has spaced apart rack supports, and so the pallet can endure other specified loads. Beams are incorporated within the frame in accord with the teachings of U.S. Pat. Nos. 6,705,237 of Moore et al., 6,955,128 of Apps et al., and 5,868,080 of Wyler et al., the disclosures of which are hereby incorporated by reference. The beams are preferably configured so that during a fire the embedded beams, and the pallet, collapse when the burning thermoplastic softens. See the related application entitled “Fire collapsible beamed pallet,” bearing Atty. No. EPC-2443 filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference. - The construction of the deck and its attachment to the thermoplastic parts of the pallet are features of the invention. The deck has texturing which provides the sheet material with strength sufficient to both carry a load of goods and to impart strength to the pallet as a whole. When meeting fire test performance is the main criterion, and diminished strength can be accepted, a variety of ways for imparting stiffness to the deck sheet material may be used. For instance, Rigidized™ metal sheet may be used. For instance, the sheet may have a waffle pattern. Preferably, the deck has a multiplicity of corrugations, and it is also made of metal, as described below.
- With reference to
FIG. 1 andFIG. 2 ,deck 22 ofpallet 20 has corrugations running in several different directions, in accord with the corrugation pattern shown as Type B inFIG. 11 . The deck is made of 0.060 inch thick Type 5052 aluminum alloy sheet. The periphery ofdeck 22 comprises aflange 49, as shown inFIGS. 1 and 4 , which is plain or un-textured and which and facilitates attachment to the frame. - The deck may be attached to the
frame 24 in various ways, to act as a structural element for racking strength and the like.FIG. 3 through 6 show in vertical cross section some alternative deck attachments.FIG. 3 shows howdeck 22 is pinned to the frame by screw or drivenpin fasteners 36.FIG. 4 shows a multiplicity of vertically extending projections or nubs, which are molded into the plastic frame when it is fabricated. After a deck with mating holes is placed on the frame, the nubs are headed, or flattened over, as indicated by the arrows and phantom inFIG. 4 . In another embodiment, shown inFIG. 5 , the deck and frame have holes, to receive the stakes of a metal orplastic rail 40, which is pressed down onto the frame to capture the flange of the deck. - In still another embodiment of deck attachment, illustrated by
FIG. 6 ,deck 22 is first encapsulated in whole or part by alayer 340 of thermoplastic, using commercial processes. Then, the layer is plastic-welded to the frame, for instance by ultrasonic, vibratory or hot plate welding. This embodiment can provide a good seal between the deck and the frame. See a related application entitled “Plastic pallet with sealed deck to frame joint”, bearing Atty. No. EPC-2442, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference. In another embodiment, not shown, the outer edge of the deck may be mechanically captured within the frame during the molding of the frame. -
FIG. 3 shows acorrugated deck 22 which has no flange and which is not inset from the outer edge of the frame; the deck covers the entire top of the pallet. Preferably, the edges of a metal deck are inset from, or inwardly spaced apart from, the outside edge of the frame by a distance D, as shown inFIGS. 1 and 2 . With the inset of the deck edge, a peripheral portion of the top of the frame is exposed. With the inset deck design, the edges of the deck are less prone to being damaged when objects horizontally impact the frame of the pallet. Distance D will be a design choice, according to the character of the exposed part the frame and anticipated impacts. In aFIG. 1 pallet embodiment, D is preferably the same for all edges, at about 1-3 inches for a GMA size pallet. D may be different at different sides of the pallet. In thepallet 120 embodiment discussed below, D is preferably about 4-5 inches. Thus for a 40×48 GMA pallet the deck area will be at least about 75 percent of total area of the top of the pallet. When the deck is metal, fire test performance is much improved due to the lessening of the quantity and surface area of combustible plastic in the pallet. - In the generality of the invention, the frame may be constructed in a manner which is familiar to those making ordinary injection molded structural beams. For example it may be shaped like a C-channel; it may have lightening pockets and ribs, etc. Preferably, the
bridge parts 25 of theframe 24 are less conventionally constructed, and they have one or more lengthwise compliant zones which comprise an impact absorber. 26. A bridge is that portion of a frame which spans the space betweenadjacent columns 28. One type ofimpact absorber 26 is shown inFIG. 1 andFIG. 2 ; another is shown inFIG. 7 . InFIG. 1 , the impact absorber comprises two parallel rows of open cells bounded by lengthwise and transverse ribs near theouter edge 27 ofbridge 25. The bridge comprises a third lengthwise zone, namely, the innermost portion of the bridge, wheredeck 22 is attached. SeeFIG. 6 . That portion is not designed for impact absorption and is of conventional structural plastic design. Thus, when horizontally impacted, the outer portion of thebridge 25 is more complaint, or less stiff and therefore more deformable, than is the innermost part of the bridge. The outer portions absorb the force of a horizontal impact and the inner portion does not appreciably move. Impact absorber construction is described more particularly in the related application entitled “Plastic pallet with sealed deck to frame joint,” bearing Atty. No. EPC-2442, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference. - Rectangular cross section beams 74 in the
rails 31, 33 of the base 30 are made of sheet metal. For example, 0.059 inch thick AISI 1040 steel, having yield strength of at least 80,000 pounds per square inch, may be used. For example, 0.090 inch thick cold rolled AISI 1018 steel having a Rockwell B hardness of 60-65 may be used. Preferably, the vertical height (or depth) of the beams is about 0.7 inch, when a metal deck is used. - If pallet weight is not critical, then the deck could be flat plate. However, it is preferred to use lighter gage sheet material and to texture the sheet, so it has good stiffness and section modulus. Some types of deck texturing are much preferred.
FIG. 11 illustrates some of the texturing patterns which are now discussed.FIG. 7 shows in isometric view, similar to the view ofFIG. 1 , a portion ofpallet 120 having a preferred corrugated deck.Pallet 120 has an essential construction and dimensions like those ofpallet 20. Numbers having two digits preceded by thedigit deck 122 ofpallet 120 comprisesparallel corrugations 45 which run at an angle to the edges of the deck and pallet. While aGMA pallet 120 preferably has an aluminum alloy sheet metal deck, as described above, the corrugation pattern invention may be employed other pallets having non-metal decks.Flange 149 ofdeck 122 is attached to theframe 124 of the pallet by means of screw or stake fasteners, or in other ways mentioned above. The center of the deck is fastened to the top ofcenter column 129. -
Deck 122 has a multiplicity ofcorrugations 45 which, when viewed in a vertical cross section, comprisevalleys 41 and peaks 47. Some exemplary corrugation cross section patterns are shown in the vertical cross section decks ofFIG. 9 andFIG. 10 . In the pattern shown inFIG. 9 the tops ofpeaks 47 and the bottoms ofvalleys 41 ofdeck 122 are substantially flat and parallel to the top of the frame; and, the peaks and valleys are connected by webs running at a nominal 45 degree angle to the horizontal. The pitch, P, or center to center spacing, of the corrugations is about 2 inches. Depth DP is the effective depth of the deck; and is nominally the depth of the valleys. All valleys are preferably of uniform depth and provide the deck with an effective depth of about 0.5 inches. -
FIG. 10 shows the corrugation cross section ofalternate embodiment deck 122A which has peaks 45A andvalleys 47A running along a nominally sinusoidal path. Other dimension corrugations may be used, including those in which the corrugations vary in width or pitch. Depth DP may vary from valley to valley and along the length of any valley. The bottoms of the valleys preferably have spaced-apart drain holes, visible inFIG. 1 andFIG. 13 , to make fire sprinkler water drop onto the underlying cross rails, for helping performance in fire tests. See related application entitled “Fire sprinkler-friendly pallet,” bearing Atty. No. EPC-2440, filed on even date herewith by R. Moore et al., the disclosure of which is hereby incorporated by reference. When made of metal, decks are formed from flat sheet using conventional metalworking techniques, including cold forming, press forming, drawing, etc. Especially when there is a flat flange, the deck may be conceived as a flat sheet into whichvalleys 41 have been pressed. Thus, in the following discussion a reference to a corrugation may be considered interchangeably to refer to a valley. - It has been discovered that particular corrugation dispositions or arrangements are surprisingly advantageous.
FIG. 8 is a top view ofpallet 120 and illustrates the lay of thelengthwise axes 53 of the corrugations. InFIG. 8 , all the corrugations ofdeck 120 run parallel to L, the line running between the intersects of the edges at two diagonally opposed comers. When the deck is congruent with the frame exterior, as is ordinarily the case, L will also be the diagonal of the frame and pallet as a whole. Line L of the deck will not be coincident with the corresponding diagonal of the frame or pallet when the rectangle of the deck is not congruent with the rectangle of the pallet. For the exemplary 40×48 pallet, the line L lies at an angle B of about 40 degrees to the longer edge of theframe 124. Theaxes 53 of all the corrugations ofdeck 120, and of certain corrugations in other embodiments, lie within plus or minus angle A of parallelism with line L. Angle A is about 10 degrees, preferably 3 degrees. If a deck is deviant from a perfect rectangle shape, L will be the diagonal of a best fit rectangle. The invention will be useful with patents which are square. When it is said corrugations are parallel, that means they are substantially parallel, and there may be small deviations from exact parallelism between adjacent corrugations. -
FIG. 11 graphically illustrates the surprising advantage in performance for certain deck corrugation patterns, as revealed by finite element analysis (FEA) of decks which were subject to the same uniform loads. In the analysis, decks were assumed to be made of 0.050 inch Type 5052 aluminum alloy sheet. All corrugations had the same width, depth and the cross section shape which is shown inFIG. 9 . Thus, only the orientations of the corrugations were changed, from one type deck to another, in the analysis. The icons inFIG. 11 are simplified top view sketches of pallet decks, to show the different deck corrugation patterns of the analysis. - The decks in the FEA were analyzed when supported in two different ways. First, the pallet was supported at the opposing 48 inch length sides, or in the so-called “long direction” (the data for which is represented by circle symbols). Second, the pallet was supported at the opposing 40 inch length sides, or in the so-called “short direction” (the data for which is represented by circle symbols). In
FIG. 11 , those two different support modes are indicated by stating the span between the supports, e.g., a span of 40 inches means the deck was supported along the 49 inch sides. The comparative FEA deformations of different configurations of decks were determined. Those data are represented in the graph by the open symbols. Maximum elastic stress in the deck was calculated according to Von Mises theory and criteria. The Von Mises analysis data are represented by solid symbols. A deck having better strength will have lower deflection and lower Von Mises values, when performance in both directions of support is considered. The comparative deflection performance of some of the patterns was confirmed in testing of prototype decks and pallets. - Decks of type INV and type I have surprising advantage over the other patterns, and they are preferred embodiments of the present invention. In type INV all the corrugations run parallel to L, the diagonal. The associated data set is marked by the
box 80. Deck of type I, with which is associateddata set 90, is only somewhat inferior to the most preferred embodiment type INV. A deck of type B provides inferior performance, compared to what artisan intuition about its symmetry might suggest. In fact, such pattern was used on early prototypes. The long direction corrugations which characterize type III deck give the deck excellent results in one span-support direction and quite inferior results in the other span-support direction. The type II deck has similar but somewhat lesser inadequacy. - The superior type I and type INV decks are characterized by at least three corrugations running continuously and parallel to the diagonal line of the deck. Type I deck has a second set of three corrugations, namely those running along the other diagonal of the pallet. The corrugations of the second set are discontinuous where their path crosses the first set of corrugations. Type I has in addition 4 to 6 valleys which run parallel to the each of the rectangular edges of the deck. In another embodiment, type IA, not shown, the configuration is like type I: A first set of at least 3 corrugations is parallel to a first diagonal line of the deck; and, all the other corrugations on the deck are parallel to the second diagonal.
- When decks are made of sheet metal, fabricating a deck of type I is much more difficult than fabricating a type INV deck. There is more of tendency for thinning of the deck material during forming, and the thinning can be difficult to predict or eliminate. Thus, a type I deck is less preferred than a type INV deck, but both are substantially superior to other types of texturing. Thus, in a preferred embodiment of the invention there are at least three parallel continuous corrugations running from one comer to the diagonally opposite comer. The permissible range of alignment of corrugations is as described above in connection with
FIG. 8 . - Variation is possible within the scope of the corrugation orientation invention. In preferred embodiment deck, one corrugation valley is centered on line L, and there are two or more parallel valleys on either side of the primary valley. The two adjacent the primary valley have only a little shorter than the primary valley length. There need not be a primary valley along L; that is, two equal length valleys of any set of three or more may straddle L. The term “corner” as applied to this aspect of the invention is to be interpreted as embracing a region of the deck, rather than a point. When corrugations are said to run from one corner of the deck to the other corner, that means the corrugations run substantially to the portion of the deck which is in proximity to the right angle intersection of two edges of the deck. Thus, when the deck has a preferred flange, the three corrugations nearest line L run to the corners, even though the outer portion of the corner near the edge intersect is an un-textured flange. While the analysis simulated a metal deck, the invention will be useful with decks which are made of non-metals. Logic suggests that two, or even one, continuous diagonal corrugations would suffice, although providing less strength but that has not yet been proved.
- There is a benefit of having a deck with a flange in combination with corrugations. Stated simplistically, the oblong or cupped end of each corrugation provides strength to the edge of the deck, and helps inhibits bending of the deck about the length axis of the corrugation at the deck edge.
- The combination of features of the invention provides another unexpected advantage, namely, a heretofore unattainable low profile, or total height, for a pallet which meets the many requirements which have been mentioned above for a GMA pallet. When invention pallets are stacked on top of each other, more pallets can be contained within a stack of a given height, than heretofore; i.e., the stacking density is significantly higher than heretofore. A significant economic benefit results from higher stacking density, since more GMA pallets can be carried on a standard transport truck.
-
FIG. 12 is used to illustrate dimensions associated with pallets.FIG. 12 is analogous toFIG. 2 and shows a vertical cross section of a simplifiedprior art pallet 220 havingmetal beams steel beams - The present invention which comprises a corrugated metal deck, in particular an aluminum deck, having the corrugations of Type INV or Type I, enables both omitting metal beams in the top and reducing the height of the beams in the base, while meeting the dimensional, load bearing and weight requirements attending a GMA pallet. Leaving the beam out of the top means the top can be made thinner than heretofore has been possible. In the invention, a top frame height DT of about 0.7 inches is achieved. As mentioned, the effective height of the deck is 0.5 inches, and that fits easily within the frame profile. The corrugated deck is sufficiently stiff and supported at the center column. Thus, when it deflects under a load of goods, it does not deflect below the elevation of the bottom of the frame.
- The strong metal deck and thermoplastic elements of the top cooperate with the base to provide good racking strength. The pallet construction enables a reduction in the size of the beams used in the base. For example, the vertical height (also called “depth”) of the steel beams in the base of a preferred embodiment pallet is about 0.5 inches, which is about 60% of the previously required beam height of 0.875 inches. Thus, in the present invention, the thicknesses of both the top and both parts of the pallet are thinner than was heretofore possible. The use of the corrugated metal deck enables a surprising and significant reduction in height and associated stacking density, compared to what could be done in the past.
- Exemplary pallets of the invention have heights of less than 5.4 inches. In a preferred embodiment a pallet is 4.7 to 4.9 inches high. As a fraction of the height of the pallet, the required minimum 3.1 inch fork opening height is more than about 60 percent; the 0.7 inch top height is less than about 15 percent; and the 0.9 inch base height is less than about 20 percent. Those percentages are a measure of the efficiency and uniqueness of the design.
- A quadrant of an
exemplary pallet 320 which has features of the present invention is shown inFIG. 13 . The exploded view ofFIG. 14 shows how it is constructed. With reference toFIG. 13 ,pallet 320 has most elements like those previously described. The corrugated deck is of the type INV and all the corrugations are parallel to the deck diagonal.Pallet 320 is different from other embodiments described up to this point in the following way: Thedeck 322 is attached to asubframe 66 which is supported within the frame by attachment to cantileverbrackets center column 329 which preferably has vertical fins on top rather than a mirror-fit corrugation contour pattern. Thesubframe 66 and attached deck are spaced apart from theinner edge 72 of the frame. Preferably, the subframe, brackets and frame are integrally molded. Eachbridge 325 has impact absorber construction across its whole width. Since the edge of the deck is spaced apart from the inner edge of the bridge, the bridge can deform compliantly and inwardly under horizontal impact loads without damaging the deck. The construction of the pallet ofFIG. 13 is further described in a patent application entitled “Plastic pallet having impact resisting top”, bearing Atty. No. EPC-2437, and an application entitled “Plastic pallet having deck suspension system”, bearing Atty. No. EPC-2439, both filed on even date herewith by R. Moore et al., the disclosures of which is hereby incorporated by reference. - A pallet of the present invention like that shown in
FIG. 13 , when made of polypropylene or comparable density plastic, and when having corrugated aluminum alloy deck and steel beams only in the base, is by weight about 30-45 percent metal, balance thermoplastic. In a preferred embodiment pallet, the metal is about 32-40 weight percent. On a volume percent basis the preferred embodiment pallet is approximately 90 percent plastic. Therefore, on both bases, the invention pallet is characterized as predominately plastic. In an exemplary a pallet, the total weight is about less than 55 pounds, preferably about 51 pounds, according to the particular height. The aluminum deck weighs about 6 lb. and the steel reinforcing beams weigh about 12.5 lb., which are respectively about 11-12% and 23-25% of the total pallet weight. Such pallet is 34-37% percent metal by weight. Some or all of the metal parts may be replaced by non-metal parts, such as with engineered plastics or ceramics which provide comparable section moduli and strengths to the metal parts. - In the present invention, the new technology makes possible the construction of GMA-load rated pallets which are predominately plastic, but at the same time they have a total height which is 10-15% less than GMA-rated pallets in the prior art. For example, a pallet which has a 4.7 inch height has about 15% less height than a 5.56 inch high prior art pallet. That means that about 20% more pallets can be carried within the volume of a typical large truck or other vehicle, which is explained now.
- A typical stack of pallets for carrying within a familiar U.S. over-the-road enclosed semi-trailer cannot exceed about 109 inch. Obviously, if the remaining space above an uppermost pallet is less than the height of a full pallet, that space must remain empty. In the invention, a stack of 23 most preferred embodiment 4.7 inch high pallets will be about 108 inches high. A stack of 19 prior art 5.56 inch pallets will be about 106 inches high. Normalizing those numbers, a stack of 5.56 inch pallets has a vertical density of 2.15 pallets per foot. In the invention, the most preferred embodiment 4.7 inch high pallet has a stack density of 2.55 pallets per foot. Table 1 shows data for different models, or embodiments of the invention. The pallet height and density data of Table 1 are plotted in
FIG. 15 . When certain cost considerations are weighed, the design Model A, having a 4.9 inch height, is most preferred at the present time; and a substantial advantage is obtained. - Of course, increased stacking density is only of interest when the pallet also meets the diverse other requirements which have been stated. Creep test performance is a demanding and critical parameter and it is used here as a measure of successful design. The creep test behavior of 40×48 pallets having the construction described in connection with
FIG. 13 was found to have the required creep properties, as well as meeting other requirements. A uniformly distributed load of 2800 pounds was applied to the deck for a period of 720 hours at a temperature of 115° F. The pallet was simply supported by its opposing base edges on open beam warehouse rack fixture. The span between the rail supports of the fixture was 4 inches less than the length of the pallet side which spanned the space between the support. In passing the test, a 4.9 inch high pallet did not deform downwardly more than 0.8 inches. Reference should be made to the Background here and the Virginia Tech Test Protocol for Plastic Pallet and proposed UL 2417 standard, the disclosures of which are hereby incorporated by reference. See especially “Bending Tests,” Section 1.2 of the Virginia Tech document, and the comparable Section 5.5 of the proposed UL 2417 standard. A pallet which passes the aforementioned 30 day creep test is said here to be GMA creep-rated. The exemplary pallet was capable of passing the other structural tests which are required for commercial usage and is thus said here to be GMA structurally rated.TABLE 1 Dimensional and stacking properties of pallets Stacking Pallet Pallet height Maximum Stack Density Embodiment inches quantity height(inches) units/foot D 4.7 23 108 2.55 A 4.9 22 108 2.44 B 5.15 21 108 2.33 C 5.45 20 109 2.2 Prior Art 5.56 19 106 2.15 - Prototype GMA pallets which had the features of most preferred embodiments of the invention passed the test of UL 2335. The pallets were made of polypropylene containing fire retardants and had a corrugated aluminum deck with drain holes over the base rails, collapsible steel beams in the base rails, and thermoset foam within the hollows of the columns.
- While the above described combinations of aluminum and steel and polypropylene materials are presently preferred, other materials can be used. For example, while the aforementioned 5000 series aluminum alloy is the preferred metal deck material, other wrought metals can be equivalently used within the scope of invention. The 5052 aluminum alloy has an elastic modulus in tension of 10.3×106 psi (7.1×104 MPa) and a specific stiffness of about 105×106 inch (26×105 m). In an alternate embodiment, AISI 300 series stainless steel may be used. Such steel alloy has about three times the density of the aluminum alloy, but it also has an elastic modulus which is about three times that of the aluminum alloy. The two classes of metals have about the same specific stiffness. Thus, in a GMA creep rated pallet, the steel deck could be about one-third of the thickness of an aluminum deck. Thus a deck may alternately be made of any of a number of steels which have mechanical properties comparable to the 300 series stainless steels. Alternately, a deck may be made of alloys of magnesium or titanium, although they have poor fire test characteristics. Sheet of fiber reinforced thermoset plastic may be used. Pallets may be alternately constructed using beams which are not metal, such as those made of graphite or glass or metal fibers. The rails of bases may be constructed wholly of engineered plastics.
- As will be understood from the foregoing and as is understood in the art, when a pallet is termed “plastic” or “thermoplastic,” unless qualified, the term does not exclude the presence of other materials such as metal reinforcing members, fillers, fibers, fire retardants, and the like; and it means that the pallet is mostly or predominately plastic or thermoplastic, as applies. A thermoplastic pallet or member may also be comprised of lesser fraction thermoset and or elastomer materials. Such terminology compares to a reference to a wholly or purely plastic or thermoplastic pallet or article. In the invention, commercially available fire retardants are ordinarily included with thermoplastics, to help meet the UL 2335 requirements, as is known in the art. See a related application entitled “Thermoplastic pallet having portions with different fire resistances”, bearing Atty. No.EPC-2514, filed on even date herewith by R. Moore et al., and U.S. Pat. No. 6,807,910, the disclosures of which are hereby incorporated by reference.
- While the invention is described and in some respects claimed in terms of a 40 inch×48 inch U.S. GMA pallet, those dimensions may vary within a several percent; and thus, the dimensions will comprehend a 1000 mm×1200 mm European pallet. The features of the invention can be applied to pallets which have other dimensions, different numbers of columns, and which meet other performance specifications. For example, the base of a pallet may have cross rails which run in a different pattern from that described. For instance, the cross rails may run between diagonally opposed corners. For instance, there may only be one cross rail. The cross rails may be wholly metal. Likewise, the columns might be wholly or part metal. For another example, a corrugated deck of the invention can be used with pallets which have no reinforcing beams in the base, or with pallets which have no base rails, but which are supported by resting the lower ends of the columns on a flat surface, in which case the columns might more accurately be called feet.
- The inventions will be useful as improvements for pallets which are not GMA dimensioned or structurally rated. The deck corrugation patterns can be used in other pallets having sheet material decks, including where the deck material is any kind of plastic, including engineered plastics, such as those reinforced with graphite fibers and fiberglass. The invention may be applied to wholly plastic pallets and pallets having wood bases.
- Although this invention has been shown and described with respect to a preferred embodiment, it will be understood by those skilled in this art that various changes in form and detail thereof may be made without departing from the spirit and scope of the claimed invention.
Claims (16)
1. A predominately thermoplastic pallet, for use with a fork lift device, which comprises:
a rectangular base comprised of rails having metal reinforcing beams;
eight spaced apart outer columns extending upwardly from the outer rails and one center column extending upwardly from the center of the base;
a top comprised of a rectangular thermoplastic frame and a corrugated sheet metal deck;
wherein the frame is attached to the tops of the outer columns;
wherein the deck is inset from the outer edge of the frame;
wherein the pallet has dimensions and properties which include
(a) outside dimensions of about 40 inches (1020 mm) by about 48 inches (1220 mm),
(b) two forklift device openings on each side of the pallet, each of which are at least 3.1 inches (79 mm) high and 12 inches (305 mm) wide;
(c) a pallet height of 5.56 inches (141 mm) or less;
(d) a weight of less than 55 pounds (25 kg) or less; and,
(e) a racking creep strength such that, when the pallet deck is subjected to a uniform load of 2800 pounds (1270 kg) for a period of 720 hours at a temperature of 115° F. (46° C.), while the pallet is supported along opposing 48 inch (1220 mm) sides by rack beams which are spaced apart 45 inches (1145 mm), the center of the pallet deflects 0.8 inches (2 mm) or less.
2. The pallet of claim 1 wherein the pallet height is about 5.4 inches (13.7 mm) or less.
3. The pallet of claim 2 wherein the pallet height is about 4.9 inches (12.4 mm) or less.
4. The pallet of claim 1 having a stacked pallet density property which is greater than 2.2 pallets per vertical foot (7.2 pallets per meter).
5. The pallet of claim 1 having a stacked pallet density property which is greater than 2.3 pallets per vertical foot (7.54 pallets per meter).
6. The pallet of claim 1 wherein the top deck is comprised of corrugated aluminum sheet metal, and the base is comprised of steel beams.
7. The pallet of claim 4 wherein the top deck is comprised of corrugated aluminum sheet metal, and the base is comprised of steel beams.
8. The pallet of claim 5 wherein the pallet is comprised of 30 to 45 percent metal by weight.
9. The pallet of claim 1 wherein the pallet has a fire test property which meets Underwriters Laboratories fire test standard UL 2335.
10. The pallet of claim 1 wherein the height of each entry opening is at least 60 percent of the height of the pallet.
11. The pallet of claim 2 , wherein the top is less than 15 percent of the height of the pallet.
12. The pallet of claim 1 , wherein said two openings are at least 12.5 inches wide.
13. The pallet of claim 1 , wherein the weight of the pallet is less than 51 pounds.
14. A GMA type pallet for use with a fork lift device which comprises:
a rectangular base comprised of outer rails arranged in a rectangular pattern and cross rails connecting the opposing side midpoints of the outer rails, the rails having steel reinforcing beams;
eight spaced apart outer columns extending upwardly from the outer rails and one center column extending upwardly from the center of the base;
a 40 inch by 48 inch top, attached to the outer columns; the top comprised of a thermoplastic rectangular frame, a subframe and a corrugated sheet metal deck;
wherein, the deck made of aluminum alloy sheet and has a circumscribing flange and at least three continuous corrugations running from one corner of the deck to a diagonally opposed corner of the deck;
wherein, the frame forms the periphery of the top and comprises bridges which span the spaces between the columns; wherein each bridge comprises a multiplicity of vertical ribs which bound closed cells within the bridge;
wherein the deck flange is attached to the subframe;
wherein the edges of the deck are spaced apart at least 4 inches from the exterior edges of the frame;
wherein the pallet is predominately comprised of a molded polyolefin selected from polyurethane and polypropylene and combinations thereof;
wherein the metal parts weigh less than 40 percent of the weight of the whole pallet; and
wherein the pallet has
(a) two forklift device openings on each side of the pallet, bounded by the bridges and the outer rails and adjacent outer columns, each opening having a height of at least about 3.1 inches (79 mm) and a width of 12 inches (305 mm);
(b) a height less not exceeding 5.5 inches (141 mm); and
(c) a stacked pallet density property which is greater than 2.2 pallets per vertical foot (7.2 pallets per meter).
15. The pallet of claim 14 , having further properties which comprise:
(d) a racking creep strength such that, when the pallet deck is subjected to a uniform load of 2800 pounds (1270 kg) for a period of 720 hours at a temperature of 115° F. (46° C.), while the pallet is supported along opposing 48 inch (1220 mm) sides by rack beams which are spaced apart 45 inches (1145 mm), the center of the pallet deflects 0.8 inches (2 mm) or less; and,
(e) a fire test performance which meets Underwriters Laboratories fire test standard UL 2335.
16. The method of making a GMA type thermoplastic pallet, wherein the pallet has a top mounted on columns extending upwardly from the base, wherein the pallet has properties which include (a) a racking creep strength such that, when the pallet deck is subjected to a uniform load of 2800 pounds (1270 kg) for a period of 720 hours at a temperature of 115° F. (46° C.), while the pallet is supported along opposing 48 inch (1220 mm) sides by rack beams which are spaced apart 45 inches (1145 mm), the center of the pallet deflects 0.8 inches (2 mm) or less; and (b) a fire test performance which meets Underwriters Laboratories fire test standard UL 2335, which comprises: providing the pallet base with steel reinforcing beams; providing the pallet with a top comprised of a plastic frame and a corrugated sheet metal deck which is inset from the outer edges of the frame and which has an area which is at least 75 percent of the area of the top of the pallet; wherein the corrugations of the deck comprise at least three of the corrugations which run diagonally from comer to comer of the deck; to thereby reduce the thermoplastic content of the deck to less than 70 percent of the weight of the pallet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/358,362 US20070022919A1 (en) | 2005-02-18 | 2006-02-21 | Low profile plastic pallet |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US65476805P | 2005-02-18 | 2005-02-18 | |
US65476005P | 2005-02-18 | 2005-02-18 | |
US65476505P | 2005-02-18 | 2005-02-18 | |
US65476105P | 2005-02-18 | 2005-02-18 | |
US11/358,362 US20070022919A1 (en) | 2005-02-18 | 2006-02-21 | Low profile plastic pallet |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070022919A1 true US20070022919A1 (en) | 2007-02-01 |
Family
ID=36917174
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/358,362 Abandoned US20070022919A1 (en) | 2005-02-18 | 2006-02-21 | Low profile plastic pallet |
US11/358,332 Abandoned US20060185565A1 (en) | 2005-02-18 | 2006-02-21 | Plastic pallet having metal deck |
US11/358,333 Abandoned US20060201398A1 (en) | 2005-02-18 | 2006-02-21 | Plastic pallet having diagonally corrugated deck |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/358,332 Abandoned US20060185565A1 (en) | 2005-02-18 | 2006-02-21 | Plastic pallet having metal deck |
US11/358,333 Abandoned US20060201398A1 (en) | 2005-02-18 | 2006-02-21 | Plastic pallet having diagonally corrugated deck |
Country Status (2)
Country | Link |
---|---|
US (3) | US20070022919A1 (en) |
WO (2) | WO2006089302A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060185565A1 (en) * | 2005-02-18 | 2006-08-24 | Brochu Ronald P | Plastic pallet having metal deck |
US20150216044A1 (en) * | 2013-12-27 | 2015-07-30 | Rohm Co., Ltd. | Chip parts and method for manufacturing the same, circuit assembly having the chip parts and electronic device |
US20180092459A1 (en) * | 2016-10-04 | 2018-04-05 | Jason Currie | Variable-Support-Point Span-Aligned-Grid Framing System |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2007241641B2 (en) * | 2006-04-20 | 2013-03-07 | Yah Corp Industries Limited | Improved Pallet |
US8302736B1 (en) * | 2007-09-28 | 2012-11-06 | Integris Rentals, L.L.C. | Containment work platform with protruding connection |
US10072465B1 (en) * | 2013-03-15 | 2018-09-11 | Integris Rentals, L.L.C. | Containment work platform |
CA2902087A1 (en) * | 2014-08-27 | 2016-02-27 | Rehrig Pacific Company | Stack and fold dairy shelves |
WO2016040300A1 (en) * | 2014-09-08 | 2016-03-17 | Green Ox Pallet Technology, Llc | Lightweight and rigid pallet |
CN113830397A (en) * | 2021-09-23 | 2021-12-24 | 业成科技(成都)有限公司 | Bearing plate and bearing plate stack structure |
Citations (87)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1910781A (en) * | 1931-03-05 | 1933-05-23 | Harry C Way | Packaging or crating structure |
US2699912A (en) * | 1953-10-06 | 1955-01-18 | Walton W Cushman | Knockdown pallet |
US2828933A (en) * | 1955-11-21 | 1958-04-01 | Arrowhead Products Inc | Pallet tiering frames |
US2908464A (en) * | 1956-01-26 | 1959-10-13 | Bird & Son | Pallet |
US2925978A (en) * | 1957-11-27 | 1960-02-23 | Marso Ernest | Platform |
US3187689A (en) * | 1961-10-20 | 1965-06-08 | Kunststoffwerk Erbach G M B H | Pallet |
US3481285A (en) * | 1968-03-07 | 1969-12-02 | Bernard Yellin | Pallet which is integrally molded of a plastic material or the like |
US3602157A (en) * | 1968-09-30 | 1971-08-31 | Abie Cohen | Pallet |
US3603272A (en) * | 1967-12-20 | 1971-09-07 | Craemer Press & Stanzwerk | Plastic pallet and die for producing the same |
US3606844A (en) * | 1969-10-30 | 1971-09-21 | Standard Oil Co | Pallet having guiding means in all sides |
US3613605A (en) * | 1970-02-01 | 1971-10-19 | Allastics Inc | Four-way, double-face general purpose pallet |
US3638586A (en) * | 1970-06-05 | 1972-02-01 | Crown Zellerbach Corp | Pallet |
US3654874A (en) * | 1970-04-28 | 1972-04-11 | Vulcan Inc | Pallet constructions |
US3664271A (en) * | 1969-12-15 | 1972-05-23 | Ernest Harold Wolder | Plastic molded pallet |
US3675595A (en) * | 1970-04-20 | 1972-07-11 | Sullifoam Inc | Pallet |
US3678868A (en) * | 1969-04-03 | 1972-07-25 | Kyowa Electric | Pallet |
US3680496A (en) * | 1970-06-08 | 1972-08-01 | Edward B Westlake Jr | Plastic pallet |
US3683823A (en) * | 1971-04-01 | 1972-08-15 | Donald E Schmid | Pallet |
US3685463A (en) * | 1971-01-18 | 1972-08-22 | Packaging Specialties Inc | Pallet |
US3685461A (en) * | 1970-10-30 | 1972-08-22 | Owens Illinois Inc | Pallet |
US3699901A (en) * | 1970-07-23 | 1972-10-24 | Oakland Plastics Corp | Pallet |
US3710733A (en) * | 1971-03-02 | 1973-01-16 | Plasteel Ind Inc | Integrated reinforced plastic unit and method and apparatus for making the same |
US3757704A (en) * | 1970-05-05 | 1973-09-11 | Owens Illinois Inc | Pallet |
US3759194A (en) * | 1970-12-19 | 1973-09-18 | Dainippon Ink & Chemicals | Plastic pallet |
US3814031A (en) * | 1972-05-26 | 1974-06-04 | Monsanto Co | Plastic pallets |
US3824933A (en) * | 1972-09-14 | 1974-07-23 | Jaw Bar Plastics Corp | Load bearing pallet and interlock |
US3868915A (en) * | 1971-12-29 | 1975-03-04 | Erich Hafner | Pallets |
US3878796A (en) * | 1973-12-05 | 1975-04-22 | Econopal Inc | Plastic pallet assembly |
US3917066A (en) * | 1973-03-22 | 1975-11-04 | Nosco Plastics | Palletized load with compression frame |
US3916803A (en) * | 1973-10-02 | 1975-11-04 | Emilia Miguel Garcia | Loading platform |
US3921279A (en) * | 1974-08-20 | 1975-11-25 | Thomas G Daley | Method for making a support for an object |
US3994241A (en) * | 1975-10-06 | 1976-11-30 | Keyrack Company, Inc. | Removable stacking frame assembly for pallets |
US4002126A (en) * | 1974-11-11 | 1977-01-11 | Said Thomas N. Depew, By Said Ferris Andrew Bell | Pallet construction |
US4050664A (en) * | 1976-05-27 | 1977-09-27 | Daley Thomas G | Object support with strapping means |
US4119205A (en) * | 1976-07-22 | 1978-10-10 | Delpack Limited | Palletized containers |
US4133270A (en) * | 1976-07-06 | 1979-01-09 | Stars Stampaggio Resine Speciali S.P.A. | Platform for the lifting and handling of goods |
US4146205A (en) * | 1973-02-05 | 1979-03-27 | Westmoreland Plastics Company | Assembly skid |
US4159681A (en) * | 1977-10-03 | 1979-07-03 | Vandament Daniel D | Reinforced, light-weight pallet |
US4183491A (en) * | 1978-05-11 | 1980-01-15 | Pinckney Molded Plastics, Inc. | Reinforced pallet |
US4359948A (en) * | 1980-04-07 | 1982-11-23 | Paul Judy & Associates | Knock-down pallet and stringer attaching mechanism |
US4403555A (en) * | 1981-06-11 | 1983-09-13 | Forrest John E | Pallet for use in handling material |
US4606278A (en) * | 1984-09-28 | 1986-08-19 | Shuert Lyle H | Twin sheet pallet |
USRE32344E (en) * | 1981-01-28 | 1987-02-03 | Bigelow-Sanford, Inc. | Shipping pallet and a package formed therefrom |
US4735154A (en) * | 1985-12-04 | 1988-04-05 | Allibert S.A. | Reinforced loading pallet and process for reinforcing same |
US4742781A (en) * | 1984-12-03 | 1988-05-10 | Shuert Lyle H | Twin sheet pallet with sleeve retaining construction |
US4799433A (en) * | 1987-02-06 | 1989-01-24 | Menasha Corporation | Large capacity shipping pallet assembly |
US4843976A (en) * | 1988-08-09 | 1989-07-04 | Pigott Maurice J | Plastic pallet |
US4869456A (en) * | 1987-11-16 | 1989-09-26 | Carson Industries, Inc. | Load supporting pad |
US4998619A (en) * | 1989-06-23 | 1991-03-12 | Signode Corporation | Close-pack, vertical-stack webbing roll packaging |
US5090336A (en) * | 1990-10-15 | 1992-02-25 | Golden Technologies Company, Inc. | Plastic shipping platform blank and shipping platform |
US5178075A (en) * | 1991-02-22 | 1993-01-12 | Okimune Kanazawa | Assembled pallet for forklift |
US5197395A (en) * | 1988-08-09 | 1993-03-30 | Pigott Maurice J | Plastic pallet with deck assembly |
US5205221A (en) * | 1986-03-14 | 1993-04-27 | Ulf Melin | Board with cellular structure |
USD346681S (en) * | 1993-04-21 | 1994-05-03 | Pigott Brandon L | Two part interlocking plastic pallet |
USD347511S (en) * | 1993-09-02 | 1994-05-31 | Pigott Brandon L | Two part interlocking plastic pallet assembly |
US5337681A (en) * | 1992-07-24 | 1994-08-16 | Schrage David A | Recyclable plastic pallet |
USD354606S (en) * | 1993-11-24 | 1995-01-17 | Pigott Brandon L | Connector for a pallet assembly |
US5391251A (en) * | 1990-05-15 | 1995-02-21 | Shuert; Lyle H. | Method of forming a pallet |
US5401347A (en) * | 1992-12-18 | 1995-03-28 | Shuert; Lyle H. | Method of making a panel structure and pallet utilizing same |
US5413052A (en) * | 1991-08-05 | 1995-05-09 | Trienda Corporation | Plastic pallet with two decks |
USD364030S (en) * | 1994-06-07 | 1995-11-07 | Pigott Brandon L | Plastic pallet assembly |
US5470641A (en) * | 1992-12-18 | 1995-11-28 | Shuert; Lyle H. | Panel structure |
USD371882S (en) * | 1994-12-15 | 1996-07-16 | Perstorp Ab | Pallet |
US5546872A (en) * | 1995-01-23 | 1996-08-20 | Young; Joseph R. | Plastic pallet |
US5549056A (en) * | 1994-03-31 | 1996-08-27 | Cadillac Products, Inc. | Load distributor for pallets |
US5550141A (en) * | 1995-08-31 | 1996-08-27 | Natural Resources - Canada | Method for inhibiting the formation of acid mine drainage |
US5551353A (en) * | 1992-08-27 | 1996-09-03 | Fiedler; Leslie C. | Lightweight pallets |
US5566624A (en) * | 1995-08-15 | 1996-10-22 | Trienda Corporation | Twin-sheet thermoformed pallet with high stiffness deck |
US5596933A (en) * | 1994-02-14 | 1997-01-28 | The Fabri-Form Co. | Reinforced plastic pallet |
USD378458S (en) * | 1995-01-17 | 1997-03-11 | Nucon Corporation | Connector for a pallet assembly |
US5666886A (en) * | 1994-07-18 | 1997-09-16 | E. I. Du Pont De Nemours And Company | Pallett assembly |
US5687652A (en) * | 1993-06-28 | 1997-11-18 | Ruma; Joseph G. | Oriented fiber reinforced monolithic plastic foam pallet |
US5778801A (en) * | 1993-05-10 | 1998-07-14 | Delacour; Frederic | Forklift pallet made of plastics material, and method of manufacture |
US5791262A (en) * | 1994-02-14 | 1998-08-11 | The Fabri-Form Co. | Reinforced plastic pallet |
USRE35870E (en) * | 1992-04-10 | 1998-08-18 | Antal Trading, Ltd. | Normed transport pallet |
USD398731S (en) * | 1997-09-30 | 1998-09-22 | Nucon Corporation | Connector for a pallet assembly |
USD398732S (en) * | 1997-09-30 | 1998-09-22 | Nucon Corporation | Connector attachment for a pallet assembly |
US5836255A (en) * | 1996-04-08 | 1998-11-17 | Uitz; Mark O. | Pallet for erected and collapsible container/pallet system |
US5845588A (en) * | 1996-01-11 | 1998-12-08 | Borealis A/S | Plastic pallet |
US5868080A (en) * | 1996-11-18 | 1999-02-09 | Engineered Polymers Corp. | Reinforced plastic pallets and methods of fabrication |
US6199488B1 (en) * | 1997-10-07 | 2001-03-13 | James Favaron | Reinforced plastic pallets |
US6354229B1 (en) * | 1999-12-06 | 2002-03-12 | Bruce T. Heidtke | Shipping platform |
US6357366B1 (en) * | 1999-02-05 | 2002-03-19 | Menasha Corporation | Rackable molded pallet |
US6389989B1 (en) * | 2001-01-05 | 2002-05-21 | Pl Eagle, Llc | Twin sheet pressure formed pallet |
US6644219B2 (en) * | 1998-07-01 | 2003-11-11 | Rehrig Pacific Company | Pallet assembly |
US6807910B2 (en) * | 2001-10-19 | 2004-10-26 | Rehrig Pacific Company | Pallet assembly |
US6986309B2 (en) * | 2000-05-31 | 2006-01-17 | Dainippon Ink And Chemicals, Inc. | Synthetic resin pallet |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3602151A (en) * | 1968-11-20 | 1971-08-31 | Grant W Walker | Energy dissipating construction for trains |
US3610173A (en) * | 1969-04-04 | 1971-10-05 | John W Mcilwraith | Plastic pallet |
US3720176A (en) * | 1970-08-13 | 1973-03-13 | Moraine Box Co | Molded pallet |
USD246296S (en) * | 1970-10-30 | 1977-11-08 | Dainippon Ink And Chemicals, Inc. | Pallet |
GB1571190A (en) * | 1975-12-09 | 1980-07-09 | Wavin Bv | Pallets |
US4220100A (en) * | 1979-02-28 | 1980-09-02 | Kitchen Michael B | Symmetrical pallets |
US4838178A (en) * | 1988-06-02 | 1989-06-13 | Haz Pal, Inc. | Hazardous material shipping pallet |
US5020667A (en) * | 1989-09-05 | 1991-06-04 | Harry Bush | Portable hazardous waste pallet structure |
US5392911A (en) * | 1993-06-03 | 1995-02-28 | Eagle Manufacturing Company | Two barrel hazardous material spill skid |
US5359955A (en) * | 1993-07-16 | 1994-11-01 | Enpac Corporation | Spill pallet with improved load bearing capability |
DE9317917U1 (en) * | 1993-11-23 | 1994-03-17 | Oeco Team Unternehmens Und Umw | Transport and storage system |
US5562047A (en) * | 1995-05-19 | 1996-10-08 | New Pig Corporation | Modular spill deck |
US5560141A (en) * | 1995-06-15 | 1996-10-01 | Inspiration Lures, Inc. | Fishing lure assembly |
US5579700A (en) * | 1995-08-07 | 1996-12-03 | Enpac Corporation | Interlocking spill pallet system |
US6446563B1 (en) * | 1998-10-07 | 2002-09-10 | Harout Ohanesian | Thermoplastic pallet |
US6186078B1 (en) * | 1999-10-29 | 2001-02-13 | Alltrista Corporation | Low profile material handling platform |
US20070051283A1 (en) * | 2000-08-24 | 2007-03-08 | Moore Roy E Jr | Plastic pallet with sealed deck to frame joint |
AU2001286752A1 (en) * | 2000-08-24 | 2002-03-04 | Infiltrator Systems, Inc. | Plastic pallet design |
US20060254478A1 (en) * | 2000-08-24 | 2006-11-16 | Kurt Kruger | Pallet with a lifting strap |
US20060249058A1 (en) * | 2000-08-24 | 2006-11-09 | Moore Roy E Jr | Fire resistant thermoplastic pallet |
US20060254477A1 (en) * | 2000-08-24 | 2006-11-16 | Moore Roy E Jr | Non-skid pallet plastic surface component |
US20020078863A1 (en) * | 2000-12-21 | 2002-06-27 | Marr Ronald J. | Metal Pallet |
WO2006089302A2 (en) * | 2005-02-18 | 2006-08-24 | The Engineered Pallet Company, Llc | Plastic pallet having diagonally corrugated deck |
US20060201401A1 (en) * | 2005-02-18 | 2006-09-14 | Moore Roy E Jr | Impact-resisting pallet having metal stay |
US20060201399A1 (en) * | 2005-02-18 | 2006-09-14 | Swistak Daniel J | Pallet having impact resisting plastic top |
-
2006
- 2006-02-21 WO PCT/US2006/006322 patent/WO2006089302A2/en active Application Filing
- 2006-02-21 US US11/358,362 patent/US20070022919A1/en not_active Abandoned
- 2006-02-21 US US11/358,332 patent/US20060185565A1/en not_active Abandoned
- 2006-02-21 US US11/358,333 patent/US20060201398A1/en not_active Abandoned
- 2006-02-21 WO PCT/US2006/006586 patent/WO2006089308A2/en active Application Filing
Patent Citations (88)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1910781A (en) * | 1931-03-05 | 1933-05-23 | Harry C Way | Packaging or crating structure |
US2699912A (en) * | 1953-10-06 | 1955-01-18 | Walton W Cushman | Knockdown pallet |
US2828933A (en) * | 1955-11-21 | 1958-04-01 | Arrowhead Products Inc | Pallet tiering frames |
US2908464A (en) * | 1956-01-26 | 1959-10-13 | Bird & Son | Pallet |
US2925978A (en) * | 1957-11-27 | 1960-02-23 | Marso Ernest | Platform |
US3187689A (en) * | 1961-10-20 | 1965-06-08 | Kunststoffwerk Erbach G M B H | Pallet |
US3603272A (en) * | 1967-12-20 | 1971-09-07 | Craemer Press & Stanzwerk | Plastic pallet and die for producing the same |
US3481285A (en) * | 1968-03-07 | 1969-12-02 | Bernard Yellin | Pallet which is integrally molded of a plastic material or the like |
US3602157A (en) * | 1968-09-30 | 1971-08-31 | Abie Cohen | Pallet |
US3678868A (en) * | 1969-04-03 | 1972-07-25 | Kyowa Electric | Pallet |
US3606844A (en) * | 1969-10-30 | 1971-09-21 | Standard Oil Co | Pallet having guiding means in all sides |
US3664271A (en) * | 1969-12-15 | 1972-05-23 | Ernest Harold Wolder | Plastic molded pallet |
US3613605A (en) * | 1970-02-01 | 1971-10-19 | Allastics Inc | Four-way, double-face general purpose pallet |
US3675595A (en) * | 1970-04-20 | 1972-07-11 | Sullifoam Inc | Pallet |
US3654874A (en) * | 1970-04-28 | 1972-04-11 | Vulcan Inc | Pallet constructions |
US3757704A (en) * | 1970-05-05 | 1973-09-11 | Owens Illinois Inc | Pallet |
US3638586A (en) * | 1970-06-05 | 1972-02-01 | Crown Zellerbach Corp | Pallet |
US3680496A (en) * | 1970-06-08 | 1972-08-01 | Edward B Westlake Jr | Plastic pallet |
US3699901A (en) * | 1970-07-23 | 1972-10-24 | Oakland Plastics Corp | Pallet |
US3685461A (en) * | 1970-10-30 | 1972-08-22 | Owens Illinois Inc | Pallet |
US3759194A (en) * | 1970-12-19 | 1973-09-18 | Dainippon Ink & Chemicals | Plastic pallet |
US3685463A (en) * | 1971-01-18 | 1972-08-22 | Packaging Specialties Inc | Pallet |
US3710733A (en) * | 1971-03-02 | 1973-01-16 | Plasteel Ind Inc | Integrated reinforced plastic unit and method and apparatus for making the same |
US3683823A (en) * | 1971-04-01 | 1972-08-15 | Donald E Schmid | Pallet |
US3868915A (en) * | 1971-12-29 | 1975-03-04 | Erich Hafner | Pallets |
US3814031A (en) * | 1972-05-26 | 1974-06-04 | Monsanto Co | Plastic pallets |
US3824933A (en) * | 1972-09-14 | 1974-07-23 | Jaw Bar Plastics Corp | Load bearing pallet and interlock |
US4146205A (en) * | 1973-02-05 | 1979-03-27 | Westmoreland Plastics Company | Assembly skid |
US3917066A (en) * | 1973-03-22 | 1975-11-04 | Nosco Plastics | Palletized load with compression frame |
US3916803A (en) * | 1973-10-02 | 1975-11-04 | Emilia Miguel Garcia | Loading platform |
US3878796A (en) * | 1973-12-05 | 1975-04-22 | Econopal Inc | Plastic pallet assembly |
US3921279A (en) * | 1974-08-20 | 1975-11-25 | Thomas G Daley | Method for making a support for an object |
US4002126A (en) * | 1974-11-11 | 1977-01-11 | Said Thomas N. Depew, By Said Ferris Andrew Bell | Pallet construction |
US3994241A (en) * | 1975-10-06 | 1976-11-30 | Keyrack Company, Inc. | Removable stacking frame assembly for pallets |
US4050664A (en) * | 1976-05-27 | 1977-09-27 | Daley Thomas G | Object support with strapping means |
US4133270A (en) * | 1976-07-06 | 1979-01-09 | Stars Stampaggio Resine Speciali S.P.A. | Platform for the lifting and handling of goods |
US4119205A (en) * | 1976-07-22 | 1978-10-10 | Delpack Limited | Palletized containers |
US4159681A (en) * | 1977-10-03 | 1979-07-03 | Vandament Daniel D | Reinforced, light-weight pallet |
US4183491A (en) * | 1978-05-11 | 1980-01-15 | Pinckney Molded Plastics, Inc. | Reinforced pallet |
US4359948A (en) * | 1980-04-07 | 1982-11-23 | Paul Judy & Associates | Knock-down pallet and stringer attaching mechanism |
USRE32344E (en) * | 1981-01-28 | 1987-02-03 | Bigelow-Sanford, Inc. | Shipping pallet and a package formed therefrom |
US4403555A (en) * | 1981-06-11 | 1983-09-13 | Forrest John E | Pallet for use in handling material |
US4606278A (en) * | 1984-09-28 | 1986-08-19 | Shuert Lyle H | Twin sheet pallet |
US4742781A (en) * | 1984-12-03 | 1988-05-10 | Shuert Lyle H | Twin sheet pallet with sleeve retaining construction |
US4735154A (en) * | 1985-12-04 | 1988-04-05 | Allibert S.A. | Reinforced loading pallet and process for reinforcing same |
US5205221A (en) * | 1986-03-14 | 1993-04-27 | Ulf Melin | Board with cellular structure |
US4799433A (en) * | 1987-02-06 | 1989-01-24 | Menasha Corporation | Large capacity shipping pallet assembly |
US4869456A (en) * | 1987-11-16 | 1989-09-26 | Carson Industries, Inc. | Load supporting pad |
US4843976A (en) * | 1988-08-09 | 1989-07-04 | Pigott Maurice J | Plastic pallet |
US5197395A (en) * | 1988-08-09 | 1993-03-30 | Pigott Maurice J | Plastic pallet with deck assembly |
US4998619A (en) * | 1989-06-23 | 1991-03-12 | Signode Corporation | Close-pack, vertical-stack webbing roll packaging |
US5391251A (en) * | 1990-05-15 | 1995-02-21 | Shuert; Lyle H. | Method of forming a pallet |
US5090336A (en) * | 1990-10-15 | 1992-02-25 | Golden Technologies Company, Inc. | Plastic shipping platform blank and shipping platform |
US5178075A (en) * | 1991-02-22 | 1993-01-12 | Okimune Kanazawa | Assembled pallet for forklift |
US5413052A (en) * | 1991-08-05 | 1995-05-09 | Trienda Corporation | Plastic pallet with two decks |
USRE35870E (en) * | 1992-04-10 | 1998-08-18 | Antal Trading, Ltd. | Normed transport pallet |
US5337681A (en) * | 1992-07-24 | 1994-08-16 | Schrage David A | Recyclable plastic pallet |
US5551353A (en) * | 1992-08-27 | 1996-09-03 | Fiedler; Leslie C. | Lightweight pallets |
US5401347A (en) * | 1992-12-18 | 1995-03-28 | Shuert; Lyle H. | Method of making a panel structure and pallet utilizing same |
US5470641A (en) * | 1992-12-18 | 1995-11-28 | Shuert; Lyle H. | Panel structure |
USD346681S (en) * | 1993-04-21 | 1994-05-03 | Pigott Brandon L | Two part interlocking plastic pallet |
US5778801A (en) * | 1993-05-10 | 1998-07-14 | Delacour; Frederic | Forklift pallet made of plastics material, and method of manufacture |
US5687652A (en) * | 1993-06-28 | 1997-11-18 | Ruma; Joseph G. | Oriented fiber reinforced monolithic plastic foam pallet |
USD347511S (en) * | 1993-09-02 | 1994-05-31 | Pigott Brandon L | Two part interlocking plastic pallet assembly |
USD354606S (en) * | 1993-11-24 | 1995-01-17 | Pigott Brandon L | Connector for a pallet assembly |
US5791262A (en) * | 1994-02-14 | 1998-08-11 | The Fabri-Form Co. | Reinforced plastic pallet |
US5596933A (en) * | 1994-02-14 | 1997-01-28 | The Fabri-Form Co. | Reinforced plastic pallet |
US5549056A (en) * | 1994-03-31 | 1996-08-27 | Cadillac Products, Inc. | Load distributor for pallets |
US5638760A (en) * | 1994-03-31 | 1997-06-17 | Cadillac Products, Inc. | Load distributor for pallets |
USD364030S (en) * | 1994-06-07 | 1995-11-07 | Pigott Brandon L | Plastic pallet assembly |
US5666886A (en) * | 1994-07-18 | 1997-09-16 | E. I. Du Pont De Nemours And Company | Pallett assembly |
USD371882S (en) * | 1994-12-15 | 1996-07-16 | Perstorp Ab | Pallet |
USD378458S (en) * | 1995-01-17 | 1997-03-11 | Nucon Corporation | Connector for a pallet assembly |
US5546872A (en) * | 1995-01-23 | 1996-08-20 | Young; Joseph R. | Plastic pallet |
US5566624A (en) * | 1995-08-15 | 1996-10-22 | Trienda Corporation | Twin-sheet thermoformed pallet with high stiffness deck |
US5550141A (en) * | 1995-08-31 | 1996-08-27 | Natural Resources - Canada | Method for inhibiting the formation of acid mine drainage |
US5845588A (en) * | 1996-01-11 | 1998-12-08 | Borealis A/S | Plastic pallet |
US5836255A (en) * | 1996-04-08 | 1998-11-17 | Uitz; Mark O. | Pallet for erected and collapsible container/pallet system |
US5868080A (en) * | 1996-11-18 | 1999-02-09 | Engineered Polymers Corp. | Reinforced plastic pallets and methods of fabrication |
USD398732S (en) * | 1997-09-30 | 1998-09-22 | Nucon Corporation | Connector attachment for a pallet assembly |
USD398731S (en) * | 1997-09-30 | 1998-09-22 | Nucon Corporation | Connector for a pallet assembly |
US6199488B1 (en) * | 1997-10-07 | 2001-03-13 | James Favaron | Reinforced plastic pallets |
US6644219B2 (en) * | 1998-07-01 | 2003-11-11 | Rehrig Pacific Company | Pallet assembly |
US6357366B1 (en) * | 1999-02-05 | 2002-03-19 | Menasha Corporation | Rackable molded pallet |
US6354229B1 (en) * | 1999-12-06 | 2002-03-12 | Bruce T. Heidtke | Shipping platform |
US6986309B2 (en) * | 2000-05-31 | 2006-01-17 | Dainippon Ink And Chemicals, Inc. | Synthetic resin pallet |
US6389989B1 (en) * | 2001-01-05 | 2002-05-21 | Pl Eagle, Llc | Twin sheet pressure formed pallet |
US6807910B2 (en) * | 2001-10-19 | 2004-10-26 | Rehrig Pacific Company | Pallet assembly |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060185565A1 (en) * | 2005-02-18 | 2006-08-24 | Brochu Ronald P | Plastic pallet having metal deck |
US20150216044A1 (en) * | 2013-12-27 | 2015-07-30 | Rohm Co., Ltd. | Chip parts and method for manufacturing the same, circuit assembly having the chip parts and electronic device |
US20180092459A1 (en) * | 2016-10-04 | 2018-04-05 | Jason Currie | Variable-Support-Point Span-Aligned-Grid Framing System |
US10070720B2 (en) * | 2016-10-04 | 2018-09-11 | Jason Currie | Variable-support-point span-aligned-grid framing system |
Also Published As
Publication number | Publication date |
---|---|
US20060201398A1 (en) | 2006-09-14 |
WO2006089308A2 (en) | 2006-08-24 |
WO2006089302A2 (en) | 2006-08-24 |
US20060185565A1 (en) | 2006-08-24 |
WO2006089308A3 (en) | 2007-09-20 |
WO2006089302A3 (en) | 2007-05-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20070022919A1 (en) | Low profile plastic pallet | |
US7308857B2 (en) | Pallet substructure and pallet design | |
US5813355A (en) | Twin-sheet thermoformed pallet with high stiffness deck | |
US6389990B1 (en) | Method of reinforcing a plastic pallet | |
AU2007241641B2 (en) | Improved Pallet | |
US20060201401A1 (en) | Impact-resisting pallet having metal stay | |
US20060201399A1 (en) | Pallet having impact resisting plastic top | |
CN114206739A (en) | Shipping pallet and/or pallet therefor | |
DK153753B (en) | MATERIALS HANDLING PALL | |
KR101115606B1 (en) | Structure for reinforcing strength in pallet | |
WO2006089299A2 (en) | Low profile plastic pallet | |
US20060201400A1 (en) | Plastic pallet having deck suspension system | |
WO2007123423A9 (en) | Pallet having a low density core upper deck. | |
KR100340558B1 (en) | Steel pallet and manufacturing method thereof | |
WO2006089242A2 (en) | Pallet having impact resisting plastic top | |
CA2599764A1 (en) | Impact-resisting pallet having metal stay | |
EP1853487A2 (en) | Plastic pallet having deck suspension system | |
AU2013200766A1 (en) | Improved pallet | |
KR20130070495A (en) | Pallet for stacking articles | |
KR20060100865A (en) | Pallet for article loading |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ENGINEERED PALLET COMPANY LLC, THE, CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOORE, ROY E JR;BROCHU, RONALD P.;SWISTAK, DANIEL J.;REEL/FRAME:019689/0967 Effective date: 20060221 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |