US2627880A - Arm mounting for tool operating motors - Google Patents

Description

Feb. 10, 1953 A. c. JOHNSON 2,627,830

' ARM MOUNTING FOR TOOL. OPERATING MOTORS Filed May 19, 1950 s Sheets-Shegt 1- IN VEN TOR. Arzfidr 6' Jab/veal? Ilia/97?] Feb. 10, 1953 A. c. JOHNSON ARM MOUNTING FOR TOOL OPERATING MOTORS 3 Sheets-Sheet 2 Filed May 19, 1950 IN V EN TOR. flrf/rar C .fofinsan Y Afforny Feb. 10, 1953 A. c. JOHNSON ARM MOUNTING FOR TOOL OPERATING MOTORS 3 Sheets-Sheet 5 Filed May 19, 1950 INVENTOR. A r/fiur (7 JZrAnSan Patented Feb. 10, 1953 UNITED STATES PATENT OFFICE ARM MOUNTING FOR TOOL OPERATING MOTORS 1 Claim.

This invention hasto do with an arm mounting and is particularly concerned with a. structure for supporting or mounting the arm of a machine such, for example, as a wood working machine of the general type wherein an arm is supported to reciprocate, usually in a horizontal plane, and serves to carry a motor which operates a saw or other tool. A general object of the present invention is to provide a mounting which is simple, efiective, and practical in construction and which serves to support an arm so that it is adjustable to various positions in a horizontal plane and can operate or reciprocate freely.

A general object of the present invention is to provide an arm mounting involving a post carried by a simple, inexpensive mechanism serving to adjust the post relative to the guide.

A further object of the invention is to provide an arm mounting of the general character referred to in which a simple, practical, inexpensive mounting means is provided in the head on the post to support the arm so that it reciprocates freely.

It is another object of the invention to provide a mechanism of the general character referred to in which various stop means and lock means are provided for controlling the working parts, all of which means are of simple construction and so constructed and located that they are simple and convenient to operate.

The mechanism embodying the present invention has a vertically disposed guide with a body portion that projects upwardly from a base.

The body portion of the guide has a vertical bore 7 that carries a tubular post so that the post can reciprocate, and rotate. A releasable stop means serves to hold the post in a predetermined rotative position in the guide while allowing it to reciprocate therein. A lock means is provided for setting or locking the post against movement relative to the guide when in any position .relative thereto.

A head on the upper end of the post involves a box-like body with vertical sides, a bottom and a top. The bottom has a depending collar portion that receives the upper end of the post and provides the means of connection between the post and the head. The top is formed separate from the other parts and is releasably secured in position by suitable fasteners. Opposite sides of the head or body have openings that pass the arm which is supported by the head. In accordance with the invention the arm is a fabricated structure involving two spaced parallel bars and these pass through suitable openings in the sides of the body. Wipers are carried by the sides of the body and engage around the rods.

Arm mountings in the head involve sets of rollers or anti-friction devices located in the body and engaging the rods of the arm. Where the arm involves two rods there are sets of rollers engaging each of the rods. In such case the sets of rollers engaging one of the rods each involves three rollers spaced around the rod and one of these is adjustable to establish the desired fit between the rod and the rollers. The set of rollers engaging the other rod involves but two rollers, for instance, upper and lower rollers, and these are adjustable to gain the desired fit with the rod and to suitably locate the rod in the head.

The arm construction is unique in that it involves two spaced parallel rods which may be plain, turned rods of like size. The rear end portions of the rods are joined by a transverse connector or web while the forward end portions are joined by a mounting which carries the tool driving motor, as for instance, through a suitable bracket or the like. A lock means is provided for setting the arm against movement relative to the head and this means preferably includes a clamp shoe in the body operated by a screw having threaded engagement with the top of the body. A suitable operating means serves to adjust the post vertically relative to its supporting guide and this means preferably involves a screw carried by the top of the body so that it can be rotated by a hand wheel mounted on the screw above the top. The screw depends cen trally through the post and has threaded engagement with a sleeve fixed to the base portion that carries the guide and extends upwardly into the lower end portion of the post.

The various objects and features of my invention will be fully understood from the followin detailed description of a typical preferred form and application of the invention, throughout which description reference is made to the accompanying drawings, in which:

Fig. 1 is a side elevation of a typical construction embodying the present invention showing it incorporated in a machine where the arm carries a motor which operates a saw. Fig. -2 is a plan view of the structure shown in Fig. 1, being a view taken as indicated by line 22 on Fig. 1. Fig. 3 is an enlarged sectional view taken as indicated by line 3-3 on Fig. '1. Fig. 4 is an enlarged vertical sectional view taken substantially as indicated by line 4-4 on Fig. 2. Fig, 5 is an enlarged plan section taken as indicated by line 5-5 on Fig. 1. Fig. 6 is a detailed sectional view taken as indicated by line 66 on Fig. 4. Fig. 7 is a plan view taken substantially as indicated by line 7-1 on Fig. 4. Fig. 8 is an enlarged view of a portion of the structure shown in Fig. 6, being a view taken as indicated by line 88 on Fig. 6. Fig. 9 is an enlarged detailed sectional view taken as indicated by line 9-9 on Fig. 4. Fig. 10 is a detailed sectional view taken as indicated by line l0l0 on Fig. l, and Fig. 11 is an enlarged detailed sectional View taken as in cheated by line ll-il on Fig. 5.

The mechanism provided by the present inven- 7 tion can be employed in various machines. However, it is particularly practical as applied to wood working machines of the type wherein a horizontally disposed reciprocating arm carries a motor driven tool such as a saw. For purpose of example the invention will be described as apfreely and lock means F serves to set or lock the post against movement in any desired position relative to the guide. I

A head G is provided on the upper end of post D and carries mounting-means H (Figs. 4, 6, 7 and 9) supporting an arm J for reciprocation. Lock means K is provided for setting the arm against movement relative to the head and operating means L is provided for operating the post vertically relative to the guide 0. The arm preferably involves spaced parallel rods l0 joined at their forward end by a motor mounting l2 shown as involving an adjustable bracket I3 that depends from the arm and carries the motor M which operates a suitable tool T. The motor and its mounting are more fully described and are the subject of copending application entitled Wood Working Machine with Motor Driven Tool and Shift-able Work Carrier, Serial No. 162,945, filed on even date herewith, now abandoned.

The base A is shown as a simple rigid horizontally disposed element suitable for mounting on a stand or bench and the particular work carrier or support B is shown as an elongate fiattopped element fixed on the forward portion of the base and provided at its rear edge with a guide or stop 20.

The guide C, as provided by the present invention, is a vertically disposed element projecting upwardly from the base A, preferably from the rear edge portion thereof. The guide C is shown as an integral extension or continuation of the base and is characterized by a vertical bore 2! (Fig. 4) that receives the post D.

The post D as provided by the present invention is a simple, elongate, tubular member, the exterior 23 of which is turned so that it is round and fits the bore 2| so the post can turn and also reciprocate relative to the guide C.

The stop means E is a releasable device serving to locate the post D in a predetermined rotative position in the guide while allowing the post 11) on the side of the guide to cooperatively engage a longitudinal slot or guideway 26 in the side of the post. A spring 21 normally yieldingly urges the pin inwardly to engage the guide and a head 28 is provided on the outer end of the pin to facilitate its operation. A lug 29 projects from one side of the pin and is engageable over a shoulder 36 so that the pin can be held in a retracted position when it is desired that the means E be held released so that it is not effective to control action of the post. The means E is illustrated in Figs. 5 and 11 of the drawings.

Y against movement relative to the guide.

to reciprocate freely while in that position. The

means E as shown in Fig. 5 may involve a stop Pin slidably was: gr s n; 2. File-.

' The lock means F serves to set or lock the post In the particular case illustrated the upper end portion of the guide is provided with a slit or opening 3!! and lugs 3| project outwardly from the guide at either side of the opening. A clamp screw 32 is carried by one of the lugs and extends through the other. A clamp nut 33 is threaded on the screw 32 to engage said other lug. The nut has an operating handle 34 so that it can be conveniently operated and when tightened'against said other lug it eiiects clamping of the guide onto the post. The details of this means are illustrated in Fig. 5 of the drawings.

The head G is provided on or carried by the post, preferably at the upper end thereof, and in accordance with the present invention the head is characterized by a box-like body having vertical sides 68, a bottom M and a top 42, see Fig. Fl. A suitable means 43 mounts the box-like body on the upper end of the post-and in the form of the invention illustrated this means involves a depending collar-like element 44 on the bottom 4| of the body, which element has a .bore 45 receiving the upper end portion of the post. Suitable lock means or set screws 45 may be provided to set the post in the collar.

The sides 40 of the box-like body are fiat vertically disposed elements and there are four sides 40 making the body rectangular in plan configuration. The top 42 of the body is removable from the other parts and is normally releasably held in place closing the, body by means of releasable fasteners 50.

The arm J, in accordance with the preferred form of the invention, involves two spaced like bars or rodsl0. Therods are coupled or joined together at their ends and are otherwise free of each other and extend parallel with each other and through the body of the head G. The coupling or connector I l joining the rear ends of the rods l0 has spaced openings or bores 53 (Fig. 3) receiving the ends of the rods and suitable set screws 54 set or look the rods in the bores 53. At the forward end of the arm the mounting 12 provided to carry the motor M serves to connect or couple the rods. 'In the particular case illustrated the mounting i2 involves a block 55 which is fixed to the rods and is, in effect,.a part of the arm, while an L-shaped bracket 13 is joined to th block 55 and depends therefrom to carry the motor M. The block 55 is shown in Fig. 10 as provided with bores 56 that receive the forward end portions of the rods and set screws 51 lock the rods in the bores 56. "A suitable center pin 58 couples the bracket I3 with the block 55 and a suitable mounting means 59 mounts the motor M on 2. depending portion of the bracket l3.

In accordance with the present invention opposite walls 40 of the body forming the head G have openings or apertures 60 (Fig. 4) that pass therods It withclearance. j 'Wherethe arm involves two sp c d parallel. ro s .121s herelnabove 5 described, each aperture wall has two suitably spaced apertures 60. j

The mounting means H provided to support the arm J in or from the head G supports the arm so that it extends horizontally or normal to the post and so that it is free to slide or reciprocate. Where the arm is made up of spaced parallel rods 10, as hereinabove described, the means H preferably involves sets X of rollers engaging one rod and a set Y of rollers engaging the other rod. In the case illustrated there are two sets X of rollers engaging one rod and one set Y of rollers engaging the other rod.

The sets X of rollers are located within the box-like body of head G and each involves a single central top roller I and two angularly related bottom rollers H, see Figs. 6 and 9. A roller mounting i 2 elongate in form is mounted on the bottom 41 of the box-like body, as by means of fasteners 18. Roller carrying spindles 74 project upwardly and outwardly at opposite sides of the mountin I2 and carry the lower rollers H. Through this element which is clearly illustrated in Fig. 6 of the drawings the rollers H cooperate to receive the rod 19 so that it is held against lateral displacement as well as being supported at the desired elevation. The top roller it! engages the top or uppermost part of the rod and retains the rod in engagement with the lower rollers H. In the particular case illustrated the lower rollers H which are spaced apart somewhat around the lower portion of the rod are supported by the mounting i2 and the spindles 14 thereon so that these rollers are in fixed position. The upper roller it, however, is mounted so that it is adjustable or can be varied in position. In the preferred form of the invention the upper or top roller I0 is carried on a spindle 75 projecting from a shank "1G rotatably supported in a bore H in the body of the head. The spindle i5 is eccentric to the shank it so that by rotating the shank in the bore ii the relationship of roller is to the bottom rollers I! can be varied. When the top roller has been suitably adjusted it can be fixed or set in position by a set screw 13 which engages the shank F6. The details of this mechanism are illustrated in Fig. 9 of the drawings.

There is one set of rollers Y engaging the other or second rod of the arm and involves but two rollers, namely a, top roller 86 and bottom roller 8 I, see Figs. 6 and 8. The rollers 80 and Bi engage the upper and lower portions of the second rod, it being unnecessary for these rollers to do other than to hold the rod against movement vertically in that the rollers first described serve to hold the arm in position laterally. In accordance with the present invention the rollers 80 and 8! are both subject to adjustment vertically so that the arm can be set accurately. In the case illustrated rollers 86 and 8| are shown carried on spindles 83 projecting from shanks 84 carried in bores 85 where they are set by screws 86 after the desired adjustment has been made.

With the mechanism above described the arm J which is an elongat element is effectively supported so that it cannot turn or rotate about its longitudinal axis but is free to slide or reciprocate longitudinally. With the construction that I have provided the desired mounting and action is gained without providing keyways, fiat sides, or other such features on any parts of the arm, but rather, I am able to employ simple straight plain round rods as the principal parts of the arm and by employing two rods of nominal weight and size I provide an arm which is-strong and rigid and at the same time light and inexpensive.

The lock means K provided for locking the arm against movement relative to the head G is shown as involving a lock shoe 9!) located in the body to extend between and bear on the rods of the arm, see Figs. 4 and 7. The shoe is carried by a stem 9| loosely linked to one side M) of the body. -A clamp s'crew 92 is threaded to the top 42 of the body and engages the shoe 310. An operating arm 92 on the screw 92 above the top 42 provides a means whereby the screw can be conveniently operated. When the screw 92 is operated so that it is elevated the shoe B0 merely rests freely on the rods of the arm, but when the screw is moved downwardly it presses the shoe tight against the rods and thus locks them against movement.

The operating means L provides for convenient operation or adjustment of the post D vertically. In accordance with the present invention the means L involves a feed screw 95 carried by the top 42 of the box-like body of head G to depend therefrom between the two rods I0 through an opening 96 in the bottom 4| and down through the post D to the lower end thereof. The screw 95 has a reduced stem 91 at its upper end rotatably carried in a central bore 98 in the top 42 and the hub 99 of a hand wheel I00 is set on the upper end of the stem 91 by a set screw I0 I. This provides a. suitable rotatable coupling between the screw 95 and the top 42 and provides a convenient operating handle above the top 42 and centrally of the structure. A sleeve I02 is fixed to the base as by fasteners I03 and extends upwardly around the lower end portion of the screw 95. The upper end of the sleeve I02 has threaded engagement with the screw so that when the screw is rotated the unit formed by the head G and post D operates vertically relative to the guide C.

In accordance with the present invention suitable sealing and wiping means is provided on each side of the box-like body that passes the rods H). In the construction illustrated a holder I I0 is provided on the exterior of each apertured side 40 and the holder carries a pad HI of suitable material such as felt, or packing, so that the rods 10 are surrounded where they pass into and out of the head. A suitable lubricant feed H2 maylbe provided for supplying lubricant to the pad I Having described only a typical preferred form and application of my invention, I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled in the art and fall within the scope of the following claim.

Having described my invention, I claim:

A post head carrying an arm and including, a box-shaped body having apertured vertical side walls passing the arm, a bottom integral with the walls, and a detachable top, a post-receiving collar integral with and depending from the bottom, a plurality of sets of rollers supported in the body and carrying the arm for reciprocation, and a lock for the arm including a lock shoe in the body carried by one of the walls and engaging the arm and an operating screw threaded to the top of the body and operating the shoe.

ARTHUR C. JOHNSON.

(References on following page) 7 REFERENCES ormn Number The following references are of record in the 3% file of this patent: iggg' gg UNITED STATES PATENTS 5 Number Name Date 2,367,461 Re. 17,329 Schmidt June 18, 1929 1,544,456 Hutchinson June 30, 1925 1,735,990 Belnap Nov. 19, 1929 Number 1,748,446 Gatzsch Feb. 25, 1930 10 274,236

Name Date Hedgpeth Apr. 29, 1930 Rueger Mar. 22, 1932 Hawley July 12, 1932 Atwood May 20, 1941 Emmons Jan. 16, 1945 FOREIGN PATENTS Country Date Great Britain July 21, 1927

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