US2475476A - Rubbing shoe - Google Patents

Description

July 5, 1949. R. J. CHAMPAYNE RUBBING SHOE Filed Jan. 25, 1945 Patented July 5, 1949 UNITED STATES PATENT OFFICE 9 Claims.

The general object of this invention is to provide a rubbing shoe having a new and improved means for fastening a rubbing sheet thereto, which fastening means is simple and inexpensive in construction, which will accommodate different numbers of rubbing sheets, which facilitates stretching of the sheets over the shoe backing, and which is adapted to clamp the sheets firmly irrespective of the number of sheets thatl are used.

A more detailed object is to provide a sheet clamping member mounted on the rubbing shoe for bodily movement relative thereto to tighten a rubbing sheet against one end surface or release the sheet.

Another object is to provide a novel rubbing sheet fastening means having a clamping element which is mounted for bodily adjustment to clamp and release the sheet, and is also swingable around the end of the rubbing shoe on which the element is supported.

The invention also resides in the novel character of the means for actuating the clamping element.

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 perspective view of a rubbing shoe embodying the present invention.

Figs. 2 and 3 are fragmentary plan views showing different positions of the sheet clamping device.

Fig. 4 is a fragmentary section taken along the line 4-4 of Fig. 3.

The invention is shown in the drawings embodied in a rubbing shoe 5 secured to a. suitable support G and adapted to be actuated either manually or by power. The body of the shoe comprises a generally rectangular block of material such as molded rubber having secured to the underside thereof a pad 'I of softer and yieldable material providing a backing for a sheet 8 of abrasive paper or other rubbing material. Narrow flanges 9 project from the substantially at ends I of the block 5 adjacent the top surface thereof, these flanges being molded integral with the block.

The abrasive sheets 8 are somewhat longer than the backing pad l, and their end portions are snubbed around the shoe ends Ill and forced by a clamping element II into the angular recess defined by theshoe end I!) and the underside of the anges 9. Herein, the clamping element is in the form of a roller of small diameter and of a length substantially equal to the width of the shoe 5. This roller is carried by a member I3 which is supported on the top of the shoe for bodily movement longitudinally of the latter to clamp and release the sheets. In this instance, this member is also swingable about an axis extending transversely of the shoe to permit the clamping roller II to be swung around the shoe end I0 and thereby facilitate stretching of the sheet 8 over the backing l.

Preferably, though not necessarily, the supporting member I3 is formed as a bail of generally rectangular shape and adapted for projection of one of the shoe ends through the bail. The bail I3, which is made of relatively stiff resilient wire, is slightly wider than the shoe, so that its opposite sides I4 are disposed adjacent the sides of the shoe when the end I5 of the bail rests on top of the block 5. The ends of the sides I5 are turned inwardly and received in holes in opposite ends of the roller II which is thus adapted to turn relative to the bail.

The closed end I5 of the bail rests on a metal plate i5 secured to the top of the shoe 5 by a fastening device I8. A lug Il integral with the plate I6 overlies the bail end I5 to form an eye which holds the bail on the shoe and is elongated in a direction longitudinally of the shoe so as to permit the bail to slide bodily back and forth, and thereby tighten the roller II against the shoe end I0 or release the clamping pressure.

The center portion of the closed bail end I5 constitutes the follower of a cam I9 which is mounted on the top of the shoe 5 for movement relative thereto in opposite directions to effect the bodily shifting of the clamping roller Il and its supporting member I3. Herein, the cam is in l the form of a disk journaled on a pin connecting the plate I6 and the forward end of the lug Il. The cam disk is disposed eccentrically relative to the pin 20 so that by swinging a lever 2| rigid with the cam, the bail may shift bodily toward the end of the shoe to release the clamping roller as shown in Fig. 3, or the bail may be shifted re- Versely to bend the end I5 thereof and draw the roller II tightly against the shoe end Ill.

To fasten one or more abrasive sheets to the shoe 5, both of the bails I3 are released as shown in Fig. 3, permitting the rollers I! to be swung downwardly around the shoe end beneath the pad 'I as shown in Fig. 4. The ends of the sheet 8 are first threaded through the hails, as shown in Fig. 4, after which the rollers II are rolled around the ends of the shoe and upwardly to a position limited by the flanges 9, thereby stretching the sheets lengthwise as their end portions become snubbed around the shoe ends. Finally, the handles 2| are turned clockwise from the position shown in Fig, 3 to the positions shown in Fig. 1 and Fig. 4 during which turning the rollers II are drawn toward the shoe ends IU to force the bent sheet ends into the recess defined by the shoe ends I0 and the undersides of the flanges 9. In this operation, the bail end I5 is bent by the cam so that the clamping force is yieldably applied, and full motion of the cam handle is permitted irrespective of the number of abrasive sheets that are used. .The friction eX- erted on the cam I9 by the bail thus stressed prevents accidental reverse turning of the cam so that the sheets remain firmly attached to the shoe during thefrubbing operations.

I Iclaim las my invention:

1. A rubbing shoe comprising a support providing a backing for a rubbing sheet projectingv beyond the end of the support, a bail of generally rectangular shape receiving the end portion of the support, means secured to the side of said, support opposite said sheet, and. providing an eye through which one end of the bail extends, said eye being elongated in a direction trans,- versely of said support, end whereby to permit swinging of the second. bail end around said support end and also bodily movement of thev bail, and a cam rotatably mounted on said sup.- -port between said support end and said rst mentioned bail end and` defining one wall of saidv eye, the periphery of said camengaging said. first bail end.

2. A rubbing shoe comprising a support pro.-- viding ay backing for av rubbing sheet projecting; beyond the end oithe support, avbailof generally rectangularshape receiving the end portion of; the' support, means; secured` to the side of s aidz support opposite said, sheet and providing an eyef through, which oneend of the; bail extends, said eye being elongated in a direction transversely of said` support end whereby to permit swinging of the secondl bail end around` said support end andC also bodilymovement of the, bail, 'and means mounted on sa-idV support for movement relative thereto and engagea/ble with; said first bail en-di to effectbodily shifting-,Vor the bail transversely of said; support end.

3. A rubbing; shoe oomprisinga; block having a flange projecting from one end'. and spaced above the bottom of the shoe,4 a bail having one end disposed above and extending across the end`r portion ofk the block and sides. lying along opposite sides thereof, a roller connecting said sides and adapted. tol rolly around the end of the block toV clampV an end of a rubbingy sheet against said block end and said flange, and a cam pivoted; on said block and engageable with said first bail: end toA tighten said roller; against the shoe end' or release'thel roller.

4. A rubbing shoe comprising a support providing a, backing for a. rubbing sheet and having: a` squared en,d a roller engageable with the end ofsaid support, a member carried by said support and supporting said roller forpivotal` movement around saidi end about an, axis spaced inwardly from the support end, said member also being mounted on said support for bodily movement relative tothe support toward and away from sai-d1 end, `and cam means mounted onI said support and movable relative thereto to shift said roller supporting` member bodily toward and awayfrom said support end f.

5,. A rubbing shoe comprising; a support` proa vidingz a backingfor4 a rubbing sheet projecting beyond; the end of the supprt', av resilientlyv ex, pansible and con-tractible bail; of generally reo. tarngular shape receiving the; end portion ofthe support, means on` the side of said support opposite said sheet supportingl onebail endfor swinging off the second bail end around said support end and also for bodily' movement of the bail along the support, and a member mountedI on said supportfor movement relative thereto and manually operable to shift the bail and draw said; secon-d bail; end against', said support end, said member' engaging the bail intermediate the sides 4 thereof whereby to expand the bail whereby to hold the other bail end yieldably against the support end.

6; A rubbing shoe comprising a support providing a backing for a rubbing sheet projecting beyond the end of the support, a bail of generally rectangular shape receiving the end portion of they support, means on the side of said support opposite said sheet supporting one bail end for swinging ofthe second bail end around said support and and. also. for bodily movement of the bail along the support, means on said support limiting said swinging movement to position said second bail end opposite said support end, and means engageable with. said -rst bail end and operable, tol shift the bail 'bodily relative to said. support and, drawv the second bail end against, the, support end.

7. A rubbing shoe, comprising a block, havingf a squaredend 'and providing, a backing surface` om one sidethereo a, clamping element extend ing alongy said. block; endy for receiving between5 thev element and block the. end portion of aruba bing sheet. lying against said.,backing,I a member supporting: Said clampingelement; for movement, toward and, away from s aid block und and mounted on, theside of said block oppositesaid., backing for bodily movement along such side, and!- a cam mounted on. saidblock tor movement Pelative theretoand., acting on saidmember to slriift.y the latter relative to; theblock in1 opposite dir-ccf. tions.

8. A rubbing-` shoe oomprising a block havingz a squared end and provid-ing; a backing surface; on one sidethereof, a,y clamping element extendingv along said block end-l for receiving between; the element and block the end of a rubbing' sheet; lying against saidbacking, a member supporting said clampingv element for movementtoward away fromI said block` endI and mountedon; the; side of said block opposite said backing for bodily` movement alo-ng such side,` and rotary cam means mounted onsaid -bltmlgfor,V movement relay. tive theretoy toshitt said member bodily relative tothe blockin; opposite direct/iurisl to releasefsaidl, clamping element or tighten the same against said; block'v end-l 9. A rubbing shoe comprising a supportl pro. vid-ins a Mak-inei for a; rubbing sheet projecting beyond the: end; 0f. the support. a roller of a length corresponding tothe width of said supe port at said end; means ornsaid support rotatably. supporting said roller to swing bodily around saidf support end;y from'. a position; beneath saidA sup port, said rollen vsupporting means; engaging said support at a point spaced inwardly from said support` endf and being; slid-'able1 alongv the supe port to; movel saidi rolle-x:` tov/:ard and away from Y the suppprt end tgl-respectively clamp.- and release the rubbing sheet, andzrneansron. said supportfolr shifting said roller supporting means bodily to clamp said' sheet against the4 support; end.

REFERENCES, CITED:

Thev following referenlces are oi?l recordI in the l'eof this patent:

UNITED, STATES. PATENTS Number Namey Date 672,408. McAfee Apr. 161, 1901 A 2,204,486 George June 1.1-, 194@ 2,282,043: Ekstrom- May-5, 1942l 2,313.4173A Champayna Nov. 16, 1945s-

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