CA2204080A1 - Window assembly and lower saw guard for circular saw - Google Patents
Window assembly and lower saw guard for circular sawInfo
- Publication number
- CA2204080A1 CA2204080A1 CA002204080A CA2204080A CA2204080A1 CA 2204080 A1 CA2204080 A1 CA 2204080A1 CA 002204080 A CA002204080 A CA 002204080A CA 2204080 A CA2204080 A CA 2204080A CA 2204080 A1 CA2204080 A1 CA 2204080A1
- Authority
- CA
- Canada
- Prior art keywords
- guard
- blade
- saw
- line
- transparent member
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
- B23D59/002—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade for the position of the saw blade
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7734—With guard for tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/828—With illuminating or viewing means for work
Abstract
A window assembly is provided for use on a hand-held circular saw. The window assembly has a transparent member that is attached to an upper guard of the saw. The transparent member has a forward edge and a rearward edge and slopes downwardly to form a rearwardly facing acute angle with respect a planar base of the saw. The acute angle has a minimum value to prevent light from overhead sources from reflecting into the user's eyes and has a maximum value to prevent light from forward light sources from reflecting into the user's eyes. The forward edge of the transparent member is located rearwardly of the point at which a predetermined line intersects the guard. Additionally, a lower blade guard is provided for use on a circular saw having a clear viewing window on the upper blade guard. The lower blade guard has a truncated portion that allows a line of sight between the workpiece being sawed and the clear viewing window even when the lower guard is in a fully retracted position.
Description
WINDOW ASSEMBLY AND LOWER SAW GUARD
FOR CIRCULAR SAW
Back~round of the Invention This invention relates to a circular saw having a viewing window on the upper guard.
One of the problems associated with the use of a hand-held circular saw is properly aligning the saw so that the desired cut is achieved. Typically, a user will draw a line on the material to be cut. This line represents the location of the desired cut. The problem arises when the user of the hand-held circular saw attempts to align the blade with the line on the material. The problem continues as the user attempts to keep the blade tracking on the desired cut line.
To assist in the alignment circular saws are typically provided with a g ude slot. The guide slot is usually located on the planar cutting base of the saw, and is positioned in front of, and in line with, the circular saw blade. The user then positions the saw so that the line on the material appears in the guide slot. While the provision of such a guide slot does aid the user in proper saw alignment, problems still exist. First, because the guide slot is located in front of the blade, if the saw blade is not ~c~clldi~ relative to the workpiece, the guide slot can be positioned on the cut line while the blade is not. If the user begins to cut the material with the saw in this orientation, it is often difficult to correct the alignment problem. Second, because the blade is covered by a saw guard, the user cannot see the blade as it exits the material, and therefore cannot directly monitor the travel of the blade.
Attempts have been made to allow the user ofthe saw to view the blade as it exits the matenal, thereby allowing the user to properly g ude the blade along the desired cut line. A device that allows a user to view the blade is disclosed in U.S. Patent No. 4,450,627. This patent discloses a circular saw with a viewing window on the upper saw guard. The window is intended to allow Misso~ri\0031397 . 01 , ~
users of the saw to properly align the saw to the workpiece by allowing them to view the blade.
While this viewing window solves the above problems to some degree, its positioning remains a problem.
If the viewing window is not properly positioned, the user will be unable to see the blade exiting the material due to the reflection of light by the transparent section of the viewing window. To ~ lr, the user may attempt to reposition the light source, such as a flashlight, or may reposition himself relative to the saw. This Ir.~ " "~ can affect efficiency as well as the quality of the work being performed. If the user repositions himself relative to the saw, the resultirlg position may be an ull~,olllrolLablc one from which to operate the saw. Further, the trial amd error necessary to find the proper position of saw, user and light source wastes the user's time.
The position of the viewing window must also account for the sawdust generated as the saw cuts through the workpiece. If the window is positioned to far forwardly, the sawdust can accumulate on the Lla~ L section of the window and impair the user's view of the blade as it exits the workpiece. The viewing window must therefore be positioned so as to minimize or eliminate the Arc~ llAtion of sawdust on the viewing window.
Further, circular saws having a viewing window have heretofore not adequately addressed the problem caused by the lower saw guard in relation to the provision of a viewing window. The lower saw guard surrounds the lower portion of the blade when the saw is not in use.
When the saw is being used, the front portion of the lower saw guard engages the workpiece and is rotated upwardly to expose the lower portion of the blade. When the lower guard is rotated fully upwardly, the rear portion of the lower saw guard can imp~ir the user's view of the blade through the transparent section of the viewing ~vindow. This; ~ does not affect the user's view as Miss~ 31397.01 2 CA 02204080 l997-04-30 the cut is initiated, but rather impairs the view when the saw is sufficiently engaged with the workpiece so as to rotate the lower guard to a fully retracted position.
Therefore, a window assembly is needed that is properly positioned in the upper saw guard of a circular saw so that the user can view, from a normal operating position, the blade exiting the workpiece. A window assembly is needed that minimizes any light reflected into the eyes of the user from both above and in front of the viewing window. Further, a window assembly is needed that is properly positioned in the upper saw guard of a circular saw so that the ArcllTn~ tinn of sawdust on the viewing window is reduced or eliminated. Finally, a lower saw guard is needed which will allow a user to view the saw blade exiting the workpiece, through a transparent member of the window assembly in the upper saw guard, even when the lower guard is in a fully retracted position.
Summar,v of the Invention Accordingly, it is an object of the present invention to provide a window assembly in the upper guard of a circular saw positioned so as to minimize any light reflected into the eyes of the person using the saw.
It is another object of the present invention to provide a window assembly located rearwardly of a ~ ", "~rl point to minimize ~rcllTnlll~tinn of sawdust on the window assembly.
A further object of this invention is to provide a window assembly having a transparent member oriented at an angle greater than a minimum angle of inclination of the viewing window relative to the workpiece.
\003199~.01 3 A still further object of this invention is to provide a window assembly having a transparent member oriented at an angle less than a maximum angle of inclination of the viewing window relative to the workpiece.
Yet another object of the invention is to provide a lower saw guard, to be used on a circular saw with a viewing window, that will not obstruct the view through the transparent member of the window even in a fully retracted position.
According to the present invention, the foregoing and other objects are obtained by a window assembly for use on a hand-held circular saw. The window assembly has a transparent member that is attached to an upper guard of the saw, and that has a top surface, a forward edge and a rear~vard edge. The transparent member slopes downwardly to form a rearwardly facing acute angle with respect to a planar base ofthe saw. The acute angle has a minimum value which prevents light from overhead sources from reflecting into the user's eyes and has a maximum value which prevents light from forward light sources from reflecting into the user's eyes. In another aspect of the invention, the forward edge of the transparent member is located where a ~ rlr~ r(~ line intersects the guard. This location prevents sawdust from r~r~ on the transparent member.
In still another aspect of the invention, a lower blade guard is provided for use on a circular saw having a clear viewing window on the upper blade guard. The lower blade guard has a truncated portion that allows a line of sight between the workpiece being sawed and the transparent member of the window assembly even when the lower guard is in a fully retracted position.
To locate the forward-most point ofthe transparent member ofthe window assembly, a line is constructed extending tangentially away from the blade at the point at which the saw blade exits tlle workpiece. This line intersects the upper blade guard. The windo~- is placed rearwardly of this intersection point.
Missouri\0031397.01 4 To establish the minimum angle of inclination for the transparent member of the window assembly, a first line is constructed from the point at which the blade exits the workpiece to the rear edge of the transparent member of the window assembly. A second line is then constructed extending horizontally outward from the rear edge of the top surface of the transparent member. A third line is constructed bisecting the angle formed by the previous two lines. This third line establishes the minimum angle of inclination for the top surface of the transparent member.
To establish the maximum angle of inclination for the transparent member of the window assembly, a first line is constructed as above. Thereafter, a forward point is located six inches in front of the point at which the blade exits the workpiece. A second line is constructed from this forward point to the rear edge of the transparent member. A third line is then constructed bisecting the angle formed by the first and second lines. This third line represents the maximum angle of inclination for the top surface of the transparent member.
Brief Description of the Drawin~s In the a~ l".ally~lg drawings which form a part of this cr~rifil ~tir)n and which are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views:
Fig. I is a front perspective view showing a properly located window assembly of the present invention attached to the upper guard of a circular saw;
Fig. 2 is a side elevation view of the saw of Fig. I showing the lower guard in a fully retracted position, Fig. 3 is an enlarged paltial top plan view taken along line 3-3 of Fig. 2, with part of the transparent member being broken away to show particular details of construction;
1~5~ssouri\0031397. 01 5 .
Fig. 4 is an enlarged pattial perspective view taken along line 4-4 c7f Fig. 3 showing the lower guard in a fully retracted position;
Fig. S is a schematic view of the saw of Fig. I, illustrating the method of calculatirlg the minimum angle of inclination for the transparent member of the window assemb~y; and Fig. 6 is a schematic view similar to Fig. 5, illustrating the method of calculating the maximum angle of inclination for the transparent member of the window assembly.
Detailed Description of the Preferred Fmbodiments Referring to the drawings in greater detail, and irlitially to Fig. I, a power circular saw designated generally by numeral 10 is shown. Saw 10 has a motor 12 which is operably attached to a circular saw blade 14. A power cord (not shown) supplies electrical power to motor 12. The upper portion of blade 14 is surrounded by an upper saw guard 18. Upper guard 18 is fixedly secured to motor 12. The lower portion of blade 14 is surrounded by a lower saw guard 20. Saw 10 further has a planar base 2 1 with an alignment notch 23 .
Lower guard 20 exposes the lower portion of blade 14 in a manner that is well-known in the art. More specifically, the front edge 22 of lower guard 20 engages the leading edge of a workpiece 24. As the saw passes further into workpiece 24, lower guard 20 is rotated generally upwardly to expose the lower portion of the blade. Guard 20 is spring loaded so that when saw 10 is disengaged from workpiece 24, lower guard 20 returns to its lower, blade covering position.
Upper guard 18 is provided with a viewing window assembly 25. Window assembly 25 has a L~ L member 26 which is held in place on guard 18 by a window frame 27.
Transparent member 26 allows the user of saw 10 to view bl~.d.e 14 as it exits workpiece 24, thereby allowing the user to properly align, and maintain alignment, of saw 10.
Misso~ri\0031997 . 0l 6 .
Transparent member 26 must be properly positioned on guard 18 to allow the user of saw 10 to properly align and monitor the travel of blade 14. First, the forward-most position of transparent member 26 on guard 18 must be ~l~t~rrninP~ Locating transparent member 26 beyond the proper forward-most position can result in the sawdust generated by blade 14 Arcl~nnlllAtin~ on transparent member 26. If sawdust ~ ""~llt~ . on transparent member 26, either transparent member 26 must be cleaned or the user's view through transparent member 26 will be obstructed by sawdust. Fur~er, the proper angle of inclination of transparent member 26 must be determined and used. Generally, there is a range between a minimum amgle of inclination amd a maximum angle of inclination that may be used. If transparent member 26 has an angle of inclination different from the angles calculated in the manner described below, the user's view through transparent member 26 will be impaired by light reflecting from the top surface of transparent member 26.
In order to determine the forward-most position of transparent member 26 on guard 18, the point at which blade 14 exits workpiece 24 is first located. This point is designated in the drawings by reference numeral 28. The cutting depth for blade 14 can be adjusted by repositioning planar base 21 so that thinner or thicker workpieces may be sawed. M~ typically ship saw 10 with blade 14 at its maximum cutting depth. In ,~ 1 "; " " ,g exit point 28, blade 14 should be set at maximum depth wbich is the most common depth utilized by saw users. As shown in Fig.
FOR CIRCULAR SAW
Back~round of the Invention This invention relates to a circular saw having a viewing window on the upper guard.
One of the problems associated with the use of a hand-held circular saw is properly aligning the saw so that the desired cut is achieved. Typically, a user will draw a line on the material to be cut. This line represents the location of the desired cut. The problem arises when the user of the hand-held circular saw attempts to align the blade with the line on the material. The problem continues as the user attempts to keep the blade tracking on the desired cut line.
To assist in the alignment circular saws are typically provided with a g ude slot. The guide slot is usually located on the planar cutting base of the saw, and is positioned in front of, and in line with, the circular saw blade. The user then positions the saw so that the line on the material appears in the guide slot. While the provision of such a guide slot does aid the user in proper saw alignment, problems still exist. First, because the guide slot is located in front of the blade, if the saw blade is not ~c~clldi~ relative to the workpiece, the guide slot can be positioned on the cut line while the blade is not. If the user begins to cut the material with the saw in this orientation, it is often difficult to correct the alignment problem. Second, because the blade is covered by a saw guard, the user cannot see the blade as it exits the material, and therefore cannot directly monitor the travel of the blade.
Attempts have been made to allow the user ofthe saw to view the blade as it exits the matenal, thereby allowing the user to properly g ude the blade along the desired cut line. A device that allows a user to view the blade is disclosed in U.S. Patent No. 4,450,627. This patent discloses a circular saw with a viewing window on the upper saw guard. The window is intended to allow Misso~ri\0031397 . 01 , ~
users of the saw to properly align the saw to the workpiece by allowing them to view the blade.
While this viewing window solves the above problems to some degree, its positioning remains a problem.
If the viewing window is not properly positioned, the user will be unable to see the blade exiting the material due to the reflection of light by the transparent section of the viewing window. To ~ lr, the user may attempt to reposition the light source, such as a flashlight, or may reposition himself relative to the saw. This Ir.~ " "~ can affect efficiency as well as the quality of the work being performed. If the user repositions himself relative to the saw, the resultirlg position may be an ull~,olllrolLablc one from which to operate the saw. Further, the trial amd error necessary to find the proper position of saw, user and light source wastes the user's time.
The position of the viewing window must also account for the sawdust generated as the saw cuts through the workpiece. If the window is positioned to far forwardly, the sawdust can accumulate on the Lla~ L section of the window and impair the user's view of the blade as it exits the workpiece. The viewing window must therefore be positioned so as to minimize or eliminate the Arc~ llAtion of sawdust on the viewing window.
Further, circular saws having a viewing window have heretofore not adequately addressed the problem caused by the lower saw guard in relation to the provision of a viewing window. The lower saw guard surrounds the lower portion of the blade when the saw is not in use.
When the saw is being used, the front portion of the lower saw guard engages the workpiece and is rotated upwardly to expose the lower portion of the blade. When the lower guard is rotated fully upwardly, the rear portion of the lower saw guard can imp~ir the user's view of the blade through the transparent section of the viewing ~vindow. This; ~ does not affect the user's view as Miss~ 31397.01 2 CA 02204080 l997-04-30 the cut is initiated, but rather impairs the view when the saw is sufficiently engaged with the workpiece so as to rotate the lower guard to a fully retracted position.
Therefore, a window assembly is needed that is properly positioned in the upper saw guard of a circular saw so that the user can view, from a normal operating position, the blade exiting the workpiece. A window assembly is needed that minimizes any light reflected into the eyes of the user from both above and in front of the viewing window. Further, a window assembly is needed that is properly positioned in the upper saw guard of a circular saw so that the ArcllTn~ tinn of sawdust on the viewing window is reduced or eliminated. Finally, a lower saw guard is needed which will allow a user to view the saw blade exiting the workpiece, through a transparent member of the window assembly in the upper saw guard, even when the lower guard is in a fully retracted position.
Summar,v of the Invention Accordingly, it is an object of the present invention to provide a window assembly in the upper guard of a circular saw positioned so as to minimize any light reflected into the eyes of the person using the saw.
It is another object of the present invention to provide a window assembly located rearwardly of a ~ ", "~rl point to minimize ~rcllTnlll~tinn of sawdust on the window assembly.
A further object of this invention is to provide a window assembly having a transparent member oriented at an angle greater than a minimum angle of inclination of the viewing window relative to the workpiece.
\003199~.01 3 A still further object of this invention is to provide a window assembly having a transparent member oriented at an angle less than a maximum angle of inclination of the viewing window relative to the workpiece.
Yet another object of the invention is to provide a lower saw guard, to be used on a circular saw with a viewing window, that will not obstruct the view through the transparent member of the window even in a fully retracted position.
According to the present invention, the foregoing and other objects are obtained by a window assembly for use on a hand-held circular saw. The window assembly has a transparent member that is attached to an upper guard of the saw, and that has a top surface, a forward edge and a rear~vard edge. The transparent member slopes downwardly to form a rearwardly facing acute angle with respect to a planar base ofthe saw. The acute angle has a minimum value which prevents light from overhead sources from reflecting into the user's eyes and has a maximum value which prevents light from forward light sources from reflecting into the user's eyes. In another aspect of the invention, the forward edge of the transparent member is located where a ~ rlr~ r(~ line intersects the guard. This location prevents sawdust from r~r~ on the transparent member.
In still another aspect of the invention, a lower blade guard is provided for use on a circular saw having a clear viewing window on the upper blade guard. The lower blade guard has a truncated portion that allows a line of sight between the workpiece being sawed and the transparent member of the window assembly even when the lower guard is in a fully retracted position.
To locate the forward-most point ofthe transparent member ofthe window assembly, a line is constructed extending tangentially away from the blade at the point at which the saw blade exits tlle workpiece. This line intersects the upper blade guard. The windo~- is placed rearwardly of this intersection point.
Missouri\0031397.01 4 To establish the minimum angle of inclination for the transparent member of the window assembly, a first line is constructed from the point at which the blade exits the workpiece to the rear edge of the transparent member of the window assembly. A second line is then constructed extending horizontally outward from the rear edge of the top surface of the transparent member. A third line is constructed bisecting the angle formed by the previous two lines. This third line establishes the minimum angle of inclination for the top surface of the transparent member.
To establish the maximum angle of inclination for the transparent member of the window assembly, a first line is constructed as above. Thereafter, a forward point is located six inches in front of the point at which the blade exits the workpiece. A second line is constructed from this forward point to the rear edge of the transparent member. A third line is then constructed bisecting the angle formed by the first and second lines. This third line represents the maximum angle of inclination for the top surface of the transparent member.
Brief Description of the Drawin~s In the a~ l".ally~lg drawings which form a part of this cr~rifil ~tir)n and which are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views:
Fig. I is a front perspective view showing a properly located window assembly of the present invention attached to the upper guard of a circular saw;
Fig. 2 is a side elevation view of the saw of Fig. I showing the lower guard in a fully retracted position, Fig. 3 is an enlarged paltial top plan view taken along line 3-3 of Fig. 2, with part of the transparent member being broken away to show particular details of construction;
1~5~ssouri\0031397. 01 5 .
Fig. 4 is an enlarged pattial perspective view taken along line 4-4 c7f Fig. 3 showing the lower guard in a fully retracted position;
Fig. S is a schematic view of the saw of Fig. I, illustrating the method of calculatirlg the minimum angle of inclination for the transparent member of the window assemb~y; and Fig. 6 is a schematic view similar to Fig. 5, illustrating the method of calculating the maximum angle of inclination for the transparent member of the window assembly.
Detailed Description of the Preferred Fmbodiments Referring to the drawings in greater detail, and irlitially to Fig. I, a power circular saw designated generally by numeral 10 is shown. Saw 10 has a motor 12 which is operably attached to a circular saw blade 14. A power cord (not shown) supplies electrical power to motor 12. The upper portion of blade 14 is surrounded by an upper saw guard 18. Upper guard 18 is fixedly secured to motor 12. The lower portion of blade 14 is surrounded by a lower saw guard 20. Saw 10 further has a planar base 2 1 with an alignment notch 23 .
Lower guard 20 exposes the lower portion of blade 14 in a manner that is well-known in the art. More specifically, the front edge 22 of lower guard 20 engages the leading edge of a workpiece 24. As the saw passes further into workpiece 24, lower guard 20 is rotated generally upwardly to expose the lower portion of the blade. Guard 20 is spring loaded so that when saw 10 is disengaged from workpiece 24, lower guard 20 returns to its lower, blade covering position.
Upper guard 18 is provided with a viewing window assembly 25. Window assembly 25 has a L~ L member 26 which is held in place on guard 18 by a window frame 27.
Transparent member 26 allows the user of saw 10 to view bl~.d.e 14 as it exits workpiece 24, thereby allowing the user to properly align, and maintain alignment, of saw 10.
Misso~ri\0031997 . 0l 6 .
Transparent member 26 must be properly positioned on guard 18 to allow the user of saw 10 to properly align and monitor the travel of blade 14. First, the forward-most position of transparent member 26 on guard 18 must be ~l~t~rrninP~ Locating transparent member 26 beyond the proper forward-most position can result in the sawdust generated by blade 14 Arcl~nnlllAtin~ on transparent member 26. If sawdust ~ ""~llt~ . on transparent member 26, either transparent member 26 must be cleaned or the user's view through transparent member 26 will be obstructed by sawdust. Fur~er, the proper angle of inclination of transparent member 26 must be determined and used. Generally, there is a range between a minimum amgle of inclination amd a maximum angle of inclination that may be used. If transparent member 26 has an angle of inclination different from the angles calculated in the manner described below, the user's view through transparent member 26 will be impaired by light reflecting from the top surface of transparent member 26.
In order to determine the forward-most position of transparent member 26 on guard 18, the point at which blade 14 exits workpiece 24 is first located. This point is designated in the drawings by reference numeral 28. The cutting depth for blade 14 can be adjusted by repositioning planar base 21 so that thinner or thicker workpieces may be sawed. M~ typically ship saw 10 with blade 14 at its maximum cutting depth. In ,~ 1 "; " " ,g exit point 28, blade 14 should be set at maximum depth wbich is the most common depth utilized by saw users. As shown in Fig.
2, from point 28, a line is constructed extending tangentially away from blade 14 and upwardly towards guard 18. This tangential line is designated in the drawings by the reference numeral 30.
The point at which line 30 intersects guard 18 defines the maximum forward-most point at which the forward edge of transparent member 26 should be positioned. This intersection point is defined ~ in the drawings by reference numeral 32. Locating tr nsparent member 26-at or behind intersection point 32 ensures that transparent member 26 is located behind the main path of the dust particles Missouri\0031397.01 7 generated by blade 14 when saw 10 engages workpiece 24. Such a location will decrease the need and frequency at which transparent member 26 must be cleaned. Therefore, locating transparent member 26 rearwardly of intersection point 32 increases the ability of the user of saw 10 to view blade exit point 28 without having the view obstructed or impaired by sawdust particles.
Having properly located the forward-most point for transparent member 26, the proper angles of inclination of transparent member 26 must also be li~tPnnin~l Referring to Fig.
5, to determine the minimum angle of inclination, a line is constructed between blade exit point 28 and the rear edge of transparent member 26. Again, this line is constructed with blade 14 at its maximum cuKing depth. The rear edge of transparent member 26 is located on guard 18 to allow a line of sight between the user in a nommal saw operating position and blade exit point 28. The line between blade exit point 28 and the rear edge of transparent member 26 is shown in the drawings by reference numeral 34. The point at which line 34 intersects guard 18 and the rear edge of the top surface of transparent member 26 is shown in the drawings by reference numeral 36. A second line 38 is ~ u~ d extending from point 36 outwardly from guard 18. Line 38 is constructed to be horizontal so that it will be substantially parallel to workpiece 24 and planar base 21. A third line 40 is constructed and extends from point 36 downwardly between lines 34 and 38. Line 40 is lu~ d so as to bisect the angle formed by first line 34 and line 38. Line 40 establishes the minimum angle of inclination, indicated by a in the drawings, for transparent member 26.
Therefore, the angle formed by the plane of the top surface of transparent member 26 relative to workpiece 24 should be no less than the acute angle a established between line 40 and workpiece 24. When transparent member 26 has an angle of inclination equal to or greater than this minimum angle, only light originating from below !ine 38 is capable of reflecting into the eyes of the user.
11issouri\0031897.01 8 Any light originating from above line 38, such as from a ceiling light, will reflect away from the user's eyes.
Having determined the minimum angle of in~lin~ti~n, the maximum angle of inclination for transparent member 26 can be determined as outlined below, with reference to Fig.
6, to establish the range of amgles that may be used for transparent member 26. In tl~ tn rninin~ the maximum angle of inclination, first line 34 is constructed in the same manner as for .1. 1. . ",;,,, ,1~ the minimum angle of inclination. Therefore, point 36 is determined in the same fashion with blade 14 at its maximum depth. Next, a forward point 42 is located six inches directly in front of blade exit point 28, in a line extending from, and in line with, blade 14. Forward point 42 represents the distant edge of a typical workpiece 24, the importance of which is more fully discussed below. A fourth line 44 is constructed connecting forward point 42 with int~rs~c.tion point 36. Thereafter, a fifth line 46 is UU~ iUl.~d bisecting the angle formed by first line 34 and fourth line 44. Fifth line 46 establishes the maximum angle of inclination of transparent member 26, indicated by ~ in the drawings. Therefore, the angle formed by the plane of transparent member 26 relative to workpiece 24 should be no greater than the acute angle ,~ established between line 46 and workpiece 24.
Workpiece 24 is often light in color and thus can reflect a considerable amount of light. When transparent member 26 has an angle of inclination equal to or less than this maximum angle ~, the operator will only be able to see a reflection of the top surface of workpiece 24 from about point 42 and beyond. Therefore, because the typical workpiece is a~ 'y six inches wide, orienting transparent member 26 with an angle of inclination equal to or less than the acute angle ~ prevents the majority of light reflected from workpiece 24 from reaching the user's eyes. Thus, the user will be better able to view the blade ~xit.,r)ûint as the cut is r~ade.
Misso~i\0031397 . 01 9 By locating transparent member 26 rearwardly of point 32 and between the minimum angle of inclination a and the maximum angle of inclination ~ as determined above, transparent member 26 will be located in a position which minimizes any obstruction caused by sawdust, and which allows the user to view exit point 28 through transparent member 26 without his or her vision being obstructed by umwanted reflections from the top surface of transparent member 26.
In an alternative embodiment, transparent member 26 is oriented with an angle of inclination equal to or greater than the acute angle a. In this c~l-bodh~ -l an opaque vertical rib 47, shown in dashed lines in Fig. 6, is attached to upper guard 18 adjacent the forward edge of transparent member 26. Again, onenting transparent member 26 at an angle greater than acute angle a prevents light from overhead sources from reflecting into the user's eyes. Rib 47 extends outwardly from upper guard 18 and thus prevents light from any forward light sources from reflecting into the user's eyes. Rib 47 could also extend along the sides of transparent member 26 if it is desired to block light sources from the sides. Thus, the orientation of transparent member 26, at an angle greater than the minimum angle of inclination, and rib 47 operate to block unwanted reflections so that the user can view exit point 28 through transparent member 26.
As outlined above, a properly positioned window assembly having a transparent member allows the user of saw 10 to view workpiece 24 free of umwanted reflections and sawdust obstructions. However, even with a properly positioned window assembly, the user's view of the point at which the blade exits the workpiece can be obstructed by the lower guard. Such an obstruction can result when the lower guard is in a fully rotated position. Therefore, lower guard 20 of the present invention has a truncated portion 48 on a rear section of lower guard 20, as best ~ seen in Figs. 3 and 4. Trll~cafed portion 48 all~ws the user of saw 10 to view blade 14 as it exits the workpiece, even when lower guard 20 is in a fully retracted position, as shown in Figs. 2 and 3 A
llisso~lri\0031997 . 01 1 0 Iine of sight is maintained through transparent member 26 to blade exit point 28, as illustrated by reference line 51 in Fig. 2.
Lower guard 20 has a perimeter wall 52 that extends between am inner side 54 and an outer side 56. Truncated portion 48 is formed as a "cut-out" from perimeter wall 52 and inner side 54, as best seen in Figs. 3 and 4. Truncated portion 48 has an inner edge 58 extending perpendicularly from inner side 54 of lower guard 20. Inner edge 58 terminates at an outer edge 60.
Outer edge 60 extends from inner edge 58 to a rear edge 62 of perimeter wall 52. Outer edge 60 is tapered towards outer side 56 as best seen in Fig. 3. Inner edge 58 and outer edge 60 define the area through which a line of sight is provided, thus allowing the user to view blade exit point 28 even when lower guard 20 is in a fully retracted position. It should be noted that inner edge 58 could extend to outer side 56, thus eliminating outer edge 60. Such a structure would still provide a line of sight to workpiece 24 through transparent member 26, but would offer less coverage of blade 14 when lower guard 20 is in a normal, blade covering position.
In use, the user of saw 10 places planar base 21 on workpiece 24 and positions saw 10 so that the desired cut line is withm aligrlment notch 23. The user then aligns saw 10 so that the front edge of blade 14 is also on the desired cut line. The user can view blade 14 for this purpose through transparent member 26. As the user begins to saw workpiece 24, lower guard 20 is rotated upwardly. The user can continually monitor the point at which blade 14 exits the workpiece by viewing this point through transparent member 26. As the user saws into workpiece 24, lower guard 20 will eventually be in a fully retracted position. The user can morlitor blade exit point 28 even when lower guard 20 is in this fully retracted position due to truncated portion 48.
Fr~m the foregoing, it will be seen that this invention is one well-adapted to attain all the ends and objects hereinabove set forth together with other advantages which are obvious and Missouri\0031897.01 11 .
CA 02204080 l997-04-30 which are inherent to the structure. It will be understood that certain features and subcnmhin~finn~
are of utility and may be employed without reference to other features and ~u~cu~bi~aLions. This is ~" ," lr" ,l ,lntrd by and is within the scope of the claims. Since many possible embodiments may be made of the invention without depalting from the scope thereof, it is to be understood that all matter herein set forth or shown in the âlculll~Jrl l~illg drawings is to he interpreted as illustrative and not in a limiting sense.
Missouri\0031397.01 12
The point at which line 30 intersects guard 18 defines the maximum forward-most point at which the forward edge of transparent member 26 should be positioned. This intersection point is defined ~ in the drawings by reference numeral 32. Locating tr nsparent member 26-at or behind intersection point 32 ensures that transparent member 26 is located behind the main path of the dust particles Missouri\0031397.01 7 generated by blade 14 when saw 10 engages workpiece 24. Such a location will decrease the need and frequency at which transparent member 26 must be cleaned. Therefore, locating transparent member 26 rearwardly of intersection point 32 increases the ability of the user of saw 10 to view blade exit point 28 without having the view obstructed or impaired by sawdust particles.
Having properly located the forward-most point for transparent member 26, the proper angles of inclination of transparent member 26 must also be li~tPnnin~l Referring to Fig.
5, to determine the minimum angle of inclination, a line is constructed between blade exit point 28 and the rear edge of transparent member 26. Again, this line is constructed with blade 14 at its maximum cuKing depth. The rear edge of transparent member 26 is located on guard 18 to allow a line of sight between the user in a nommal saw operating position and blade exit point 28. The line between blade exit point 28 and the rear edge of transparent member 26 is shown in the drawings by reference numeral 34. The point at which line 34 intersects guard 18 and the rear edge of the top surface of transparent member 26 is shown in the drawings by reference numeral 36. A second line 38 is ~ u~ d extending from point 36 outwardly from guard 18. Line 38 is constructed to be horizontal so that it will be substantially parallel to workpiece 24 and planar base 21. A third line 40 is constructed and extends from point 36 downwardly between lines 34 and 38. Line 40 is lu~ d so as to bisect the angle formed by first line 34 and line 38. Line 40 establishes the minimum angle of inclination, indicated by a in the drawings, for transparent member 26.
Therefore, the angle formed by the plane of the top surface of transparent member 26 relative to workpiece 24 should be no less than the acute angle a established between line 40 and workpiece 24. When transparent member 26 has an angle of inclination equal to or greater than this minimum angle, only light originating from below !ine 38 is capable of reflecting into the eyes of the user.
11issouri\0031897.01 8 Any light originating from above line 38, such as from a ceiling light, will reflect away from the user's eyes.
Having determined the minimum angle of in~lin~ti~n, the maximum angle of inclination for transparent member 26 can be determined as outlined below, with reference to Fig.
6, to establish the range of amgles that may be used for transparent member 26. In tl~ tn rninin~ the maximum angle of inclination, first line 34 is constructed in the same manner as for .1. 1. . ",;,,, ,1~ the minimum angle of inclination. Therefore, point 36 is determined in the same fashion with blade 14 at its maximum depth. Next, a forward point 42 is located six inches directly in front of blade exit point 28, in a line extending from, and in line with, blade 14. Forward point 42 represents the distant edge of a typical workpiece 24, the importance of which is more fully discussed below. A fourth line 44 is constructed connecting forward point 42 with int~rs~c.tion point 36. Thereafter, a fifth line 46 is UU~ iUl.~d bisecting the angle formed by first line 34 and fourth line 44. Fifth line 46 establishes the maximum angle of inclination of transparent member 26, indicated by ~ in the drawings. Therefore, the angle formed by the plane of transparent member 26 relative to workpiece 24 should be no greater than the acute angle ,~ established between line 46 and workpiece 24.
Workpiece 24 is often light in color and thus can reflect a considerable amount of light. When transparent member 26 has an angle of inclination equal to or less than this maximum angle ~, the operator will only be able to see a reflection of the top surface of workpiece 24 from about point 42 and beyond. Therefore, because the typical workpiece is a~ 'y six inches wide, orienting transparent member 26 with an angle of inclination equal to or less than the acute angle ~ prevents the majority of light reflected from workpiece 24 from reaching the user's eyes. Thus, the user will be better able to view the blade ~xit.,r)ûint as the cut is r~ade.
Misso~i\0031397 . 01 9 By locating transparent member 26 rearwardly of point 32 and between the minimum angle of inclination a and the maximum angle of inclination ~ as determined above, transparent member 26 will be located in a position which minimizes any obstruction caused by sawdust, and which allows the user to view exit point 28 through transparent member 26 without his or her vision being obstructed by umwanted reflections from the top surface of transparent member 26.
In an alternative embodiment, transparent member 26 is oriented with an angle of inclination equal to or greater than the acute angle a. In this c~l-bodh~ -l an opaque vertical rib 47, shown in dashed lines in Fig. 6, is attached to upper guard 18 adjacent the forward edge of transparent member 26. Again, onenting transparent member 26 at an angle greater than acute angle a prevents light from overhead sources from reflecting into the user's eyes. Rib 47 extends outwardly from upper guard 18 and thus prevents light from any forward light sources from reflecting into the user's eyes. Rib 47 could also extend along the sides of transparent member 26 if it is desired to block light sources from the sides. Thus, the orientation of transparent member 26, at an angle greater than the minimum angle of inclination, and rib 47 operate to block unwanted reflections so that the user can view exit point 28 through transparent member 26.
As outlined above, a properly positioned window assembly having a transparent member allows the user of saw 10 to view workpiece 24 free of umwanted reflections and sawdust obstructions. However, even with a properly positioned window assembly, the user's view of the point at which the blade exits the workpiece can be obstructed by the lower guard. Such an obstruction can result when the lower guard is in a fully rotated position. Therefore, lower guard 20 of the present invention has a truncated portion 48 on a rear section of lower guard 20, as best ~ seen in Figs. 3 and 4. Trll~cafed portion 48 all~ws the user of saw 10 to view blade 14 as it exits the workpiece, even when lower guard 20 is in a fully retracted position, as shown in Figs. 2 and 3 A
llisso~lri\0031997 . 01 1 0 Iine of sight is maintained through transparent member 26 to blade exit point 28, as illustrated by reference line 51 in Fig. 2.
Lower guard 20 has a perimeter wall 52 that extends between am inner side 54 and an outer side 56. Truncated portion 48 is formed as a "cut-out" from perimeter wall 52 and inner side 54, as best seen in Figs. 3 and 4. Truncated portion 48 has an inner edge 58 extending perpendicularly from inner side 54 of lower guard 20. Inner edge 58 terminates at an outer edge 60.
Outer edge 60 extends from inner edge 58 to a rear edge 62 of perimeter wall 52. Outer edge 60 is tapered towards outer side 56 as best seen in Fig. 3. Inner edge 58 and outer edge 60 define the area through which a line of sight is provided, thus allowing the user to view blade exit point 28 even when lower guard 20 is in a fully retracted position. It should be noted that inner edge 58 could extend to outer side 56, thus eliminating outer edge 60. Such a structure would still provide a line of sight to workpiece 24 through transparent member 26, but would offer less coverage of blade 14 when lower guard 20 is in a normal, blade covering position.
In use, the user of saw 10 places planar base 21 on workpiece 24 and positions saw 10 so that the desired cut line is withm aligrlment notch 23. The user then aligns saw 10 so that the front edge of blade 14 is also on the desired cut line. The user can view blade 14 for this purpose through transparent member 26. As the user begins to saw workpiece 24, lower guard 20 is rotated upwardly. The user can continually monitor the point at which blade 14 exits the workpiece by viewing this point through transparent member 26. As the user saws into workpiece 24, lower guard 20 will eventually be in a fully retracted position. The user can morlitor blade exit point 28 even when lower guard 20 is in this fully retracted position due to truncated portion 48.
Fr~m the foregoing, it will be seen that this invention is one well-adapted to attain all the ends and objects hereinabove set forth together with other advantages which are obvious and Missouri\0031897.01 11 .
CA 02204080 l997-04-30 which are inherent to the structure. It will be understood that certain features and subcnmhin~finn~
are of utility and may be employed without reference to other features and ~u~cu~bi~aLions. This is ~" ," lr" ,l ,lntrd by and is within the scope of the claims. Since many possible embodiments may be made of the invention without depalting from the scope thereof, it is to be understood that all matter herein set forth or shown in the âlculll~Jrl l~illg drawings is to he interpreted as illustrative and not in a limiting sense.
Missouri\0031397.01 12
Claims (9)
1. A window assembly for a hand-held circular saw, the saw having a circular blade surrounded adjacent its upper periphery by an upper guard and having a substantially planar base for supporting the saw on a workpiece, the assembly comprising:
a transparent member adapted to be attached to the upper guard adjacent a forward half of the blade, said member having a top surface, a forward edge, and a rearward edge; and wherein said top surface of said member slopes downwardly from said rearward edge to said forward edge to form a rearwardly facing acute angle with respect to the planar base, said angle having a minimum value which reduces glare from overhead light sources that is the value of a bisecting angle of an angle formed by a first line extending from a first point where the periphery of the blade exits the top of the workpiece to said rear edge of said top surface of said member and a second line extending forwardly from said rear edge and parallel to said planar base.
a transparent member adapted to be attached to the upper guard adjacent a forward half of the blade, said member having a top surface, a forward edge, and a rearward edge; and wherein said top surface of said member slopes downwardly from said rearward edge to said forward edge to form a rearwardly facing acute angle with respect to the planar base, said angle having a minimum value which reduces glare from overhead light sources that is the value of a bisecting angle of an angle formed by a first line extending from a first point where the periphery of the blade exits the top of the workpiece to said rear edge of said top surface of said member and a second line extending forwardly from said rear edge and parallel to said planar base.
2. The window assembly of claim 1 wherein said rearwardly facing acute angle has a maximum value which reduces glare from forward light sources that is the value of a bisecting angle of an angle formed by said first line and a third line that extends from a second point six inches directly in front of said first point to said rear edge said top surface of said member.
3. The window assembly of claim 1 wherein said first point is determined when the blade is at its maximum cutting depth.
4. The window assembly of claim 1 wherein said transparent member is generally planar.
5. A window assembly for a hand-held circular saw, the saw having a circular blade surrounded adjacent its upper periphery by an upper guard and having a substantially planar base, the assembly comprising:
a transparent member adapted to be attached to the upper guard adjacent a forward half of the blade, said member having a forward edge and a rearward edge; and wherein said member slopes downwardly from said rearward edge to said forward edge to form a rearwardly facing acute angle with respect to the planar base, and wherein said forward edge of said member is placed at a horizontal location on the upper guard that is rearward of a point where a predetermined line intersects the guard, said line being the tangent line of the point where the blade exits the periphery of the workpiece.
a transparent member adapted to be attached to the upper guard adjacent a forward half of the blade, said member having a forward edge and a rearward edge; and wherein said member slopes downwardly from said rearward edge to said forward edge to form a rearwardly facing acute angle with respect to the planar base, and wherein said forward edge of said member is placed at a horizontal location on the upper guard that is rearward of a point where a predetermined line intersects the guard, said line being the tangent line of the point where the blade exits the periphery of the workpiece.
6. The window assembly of claim 4 wherein said exit point of said blade is determined when the blade is at its maximum cutting depth.
7. The window assembly of claim 5 wherein said transparent member is generally planar.
8. A lower saw guard for a hand-held circular saw having a blade and a clear viewing window located on an upper saw guard for viewing the point at which the blade exits a workpiece, the lower saw guard comprising:
a forward section for engaging the workpiece, wherein when said forward section engages the workpiece, the lower guard rotates upwardly towards said upper guard to expose a lower portion of the blade;
an arcuate perimeter wall surrounding a portion of a perimeter of the blade,said wall disposed between an inner side and an outer side; and a rear section having a truncated portion allowing a line of sight between the viewing window and the point at which the blade exits the workpiece, wherein said line of sight is maintained even when said lower guard has been rotated upwardly to a fully retracted position.
a forward section for engaging the workpiece, wherein when said forward section engages the workpiece, the lower guard rotates upwardly towards said upper guard to expose a lower portion of the blade;
an arcuate perimeter wall surrounding a portion of a perimeter of the blade,said wall disposed between an inner side and an outer side; and a rear section having a truncated portion allowing a line of sight between the viewing window and the point at which the blade exits the workpiece, wherein said line of sight is maintained even when said lower guard has been rotated upwardly to a fully retracted position.
9. The lower guard of claim 4 wherein said truncated portion of said rear section extends from said inner side into said perimeter wall and terminates prior to said outer wall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/655,991 US5794351A (en) | 1996-05-31 | 1996-05-31 | Window assembly and lower saw guard for circular saw |
| US08/655,991 | 1996-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2204080A1 true CA2204080A1 (en) | 1997-11-30 |
Family
ID=24631207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002204080A Abandoned CA2204080A1 (en) | 1996-05-31 | 1997-04-30 | Window assembly and lower saw guard for circular saw |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US5794351A (en) |
| EP (1) | EP0810070B1 (en) |
| CN (1) | CN1083311C (en) |
| CA (1) | CA2204080A1 (en) |
| DE (1) | DE69729977T2 (en) |
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-
1996
- 1996-05-31 US US08/655,991 patent/US5794351A/en not_active Expired - Lifetime
-
1997
- 1997-04-30 CA CA002204080A patent/CA2204080A1/en not_active Abandoned
- 1997-05-27 EP EP97303585A patent/EP0810070B1/en not_active Expired - Lifetime
- 1997-05-27 DE DE69729977T patent/DE69729977T2/en not_active Expired - Fee Related
- 1997-05-30 CN CN97112915A patent/CN1083311C/en not_active Expired - Fee Related
-
1998
- 1998-01-12 US US09/005,814 patent/US5911482A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1176861A (en) | 1998-03-25 |
| CN1083311C (en) | 2002-04-24 |
| EP0810070A3 (en) | 1998-09-23 |
| US5911482A (en) | 1999-06-15 |
| DE69729977D1 (en) | 2004-09-02 |
| US5794351A (en) | 1998-08-18 |
| EP0810070B1 (en) | 2004-07-28 |
| DE69729977T2 (en) | 2005-07-21 |
| EP0810070A2 (en) | 1997-12-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |