US2521689A - Rubbing shoe - Google Patents

Description

Patented Sept. 12,1950

oFF ce I RUBBING SHOE Roy. Champayiie, Rockford, Ill. Application January 3, 1949, Serial N o. 68,813

3Claims. (01. 51-189) This invention relates to a rubbing shoe providing a backing for one or more rubbing sheets bent around the shoe ends and held by clamps.

The general object is to provide a new and improvedrubbing shoe clamp which is simple and inexpensive in construction, which facilitates insertion of one or more rubbing sheets while the latter are held against the shoe bottom, which is adapted to hold the sheets firmly, and which is disposed in an out of the way position so as not to interfere with the normal use of the shoe.

vA more detailed object is to provide a clamp of the above character which is adapted to be opened by manually squeezing together the rubbing shoe and an actuating member, which, when the clamp is closed, is spaced above and projects inwardly along the top of the shoe.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which Figure 1 is a fragmentary side elevational view of a rubbing machine equipped with a shoe clamp embodying the novel features of the present invention.

Fig. 2 is a section taken along the line 2-2 of Fig. 1.

Fig. 3 is avfragmentary plan view.

Fig. 4 is a view similar to Fig. 1 illustrating the manner of opening the clamp.

In the drawings, the invention is shown associated with a rubbing shoe 4 secured to a suitable support 5 and adapted to be actuated either manually or by power. The body of the shoe comprises a generally rectangular and relatively rigid plate 6 having secured to the underside thereof a pad I of softer and yieldable material providing a backing for one or more sheets 8 of abrasive paper or other rubbing material.

The abrasive sheets are somewhat longer than the shoe 5 so that their end portions 9, after being bent upwardly around the squared ends ID of the shoe, project a short distance above the top of the shoe for entry between the downwardly opening jaws of a clamp mounted on the top of the shoe adjacent the shoe end. The fixed jaw ll of the clamp is spaced 2. short distance back from the shoe end Ill and is disposed in upright position and preferably inclined inwardly away from the shoe end. Herein, this jaw is formed by one flange of an angle bar l2 whose other flange is secured as by screws 13 against the flat top of the block 6.

The movable jaw of the clamp comprises a bar 14 of suitable material such as relatively firm 2 rubber secured to the back of a flange IS on sheet metal member 16 of L-shaped cross section having a short arm I! disposed above and project-. ing across a pivot pin I8 supported by and projecting alongthe upper edge of the fixed jaw H. Herein, upstanding lugs I9 on the jaw II are curled around opposite end portions of the pinand are disposed between ears 20 integral with and bent down from opposite ends of the sheet metal member 16. Opposite ends of the pin project through holes in these ears which abut. against the lugs l9 and thus center the movablejaw relative to the shoe and the fixed jaw.

A spring 2| is coiled about the pin l8 between the lugs 19 with one end 22 hearing against the back of the jaw H and the other end 23 projecting through a hole 24 in themovable jaw flange I5 and acting downwardly on the latter. The torsional force exerted by the spring urges the movable jaw l l inwardly toward the fixed jaw H thereby snubbing the abrasive sheets around the upper edge 25 of the shoe end and pressing the sheets firmly against the jaw II.

In accordance with the present invention, out- 25 ward movement of the movable jaw to release the clamp is effected by pressing toward the top of the shoe an actuating arm 26 which, when the clamp is closed, is disposed above the top of the shoe but spaced close enough to the bottom of the shoe -to;enable the shoe and the 'arm to be squeezed between the operators thumb and forefinger as illustrated in Fig. 4. Preferably, the actuating member projects inwardly from the shoe end and diagonally across the latter so that; the end of the member is disposed in an out of the way position adjacent one edge of the shoe as shown in Fig. 3. The other end of the actuating member is rigid with the short flange I1 of the angle member l6, and the entire actuating member lies substantially in the plane of this flange so as to be disposed substantially parallel to the top of the shoe when the clamping jaws are closed together.

When it is desired to attach one or more abrasive sheets 8 to the shoe, the sheets are located properly against the shoe bottom and held in this position by the thumb 21 of the users hand. With the forefinger 28 overlapping the end of the actuating arm 26, a squeezing pressure is applied to swing the arm toward the top of the shoe as shown in Fig. 4. This swings the jaw 14 outwardly and thus opens the clamp. With the other hand, which is left free, the operator then bends the ends 9 of the rubbing sheets upwardly and around the shoe end I!) and threads them in.

between the separated clamping jaws. The ends are gripped and held firmly simply by releasing the pressure on the actuating arm 26. During this operation, it will be observed that the sheets are held in proper position relative to the shoe bottom by the same hand of the operator that is holding the clamp released. The other hand is left free to work the sheet ends around the shoe and draw the sheets tightly against the shoe bottom. y

It will be observed that the clamp proper is formed by two relatively simple sheet metal parts, and no portions of these parts overhang the ends of the shoe so as to interfere with the normal use of the shoe. Moreover, the actuating arm may be relatively long so as to act with substantial leverage in overcoming the spring 2| which may be scaled to produce firm gripping of the abrasive sheets.

I claim as my invention:

1. The combination of, a rubbing shoe providing: on, one side backing. for a rubbing sheet, .a jaw. fixed. toa-ndupstanding from. the other side of said shoeadjaoent one end. thereof so asto. face outwardly. from the shoe end, anflarm. mounted n on said shoe tcswing about an axis spacedabove the shoe anciextendingv along said jaw, said arm extending inwardly and diagonally across said shoe tQ-locatev the free end of 1e arm adjacent one. edge oi the shoe; a movable jaw disposed opposite said first. law. andv rigid with said-. arm so as. to. be swun outwardly away from the first jaw when thearm is pressed. toward. the shoe, and spring meansnormallyv urgingsaid movable jaw toward said first. jaw. I

The combination of,. arubbing shoe'providing abaoking; surface on one. side thereof, a member of. generally--. -L. -shaped;cross-section having ne leg; ex ending. across. and secured to one. end ofsaid shoeon the other side thereof and another leg upstanding fromnthe. shoe adjacent saidend o. as to. iace outwardly therefrom and' engage. one side of an abrasive sheet bent around the shoe nd..a..sec.ond. L-shaped. member pivoted intermQdiateits ends: on a, fixed axis extending along the free edge or the upstanding leg of said first. L,-.s;hap,ed member, said second L-shaped member having one leg disposed outwardly: from and. co nemt m with said, upstanding leg to form a damn downwardly. for receiving the:

abrasive sheet and another leg projecting iriwardly from the shoe end and disposed, when the clamp is closed, substantially parallel to and spaced from said other shoe side, and spring means acting at opposite ends on the respective legs forming the clamp to urge the two together, said inwardly projecting leg of said second L- shaped member being disposed adjacent a longitudinal edge of. said shoe so that the clamp may be opened by straddling the shoe edge and pressi'ng'the inwardly projecting leg toward said other shoe side.

3. The combination of, a rubbing shoe provid- 1 ing a backing surface on one side thereof, a

member generally L-shaped in cross-section having one leg extending across and secured to one end of said shoe on the other side thereof and another leg upstanding from the shoe adjacent said end so as to face outwardly therefrom and engage one side of an abrasive sheet bent around the shoeend a second L-shaped inember pivoted intermediate its ends on a fixed axis extending along the free edge of the upstanding leg of said first L-shaped member, said second L-shaped member having one leg disposed outwardly from and. cooperating with said upstanding leg to form a clamp opening downwardly for receiving the abrasive sheet and another leg projecting inwardly from the shoe end and disposed, when the clamp closed, substantially parallel to and spaced from said other shoe side to permit opening of the clamp by manually pressing said inwardly projecting leg toward the shoe.

ROY J. CHAMPAYNE.

v {EFERENoEs CITED The following"references are of record in the file of this patent:

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