US2072130A - Abrading tool - Google Patents

Description

March 2, 1937. w. R. BARCLAY ABRAD I NC: TOOL Filed Dec. 4, 1954 Fig". 2.

Patented Mar. 2, 1937 UNITED STATES PATENT OFFICE ABRADING TOOL William Roderick Barclay, Leicester, England,

assignor to United Shoe Machinery Corporation, Paterson, N. J., a corporation of New Jersey Application December 4, 1934, Serial No. 755,972 In Great Britain June 5, 1934 Claims. (O1. 51194) This invention relates to abrading tools and is pad for supporting an abrasive cover upon the herein disclosed as embodied in a disk type of above-mentioned tool; tool such as is used in buffing the shank and heel Fig. 3 is a sectional view taken on the line breasts of shoes. In the application for United IIIIII of Fig. 2;

5 States Letters Patent of Fred Ricks and Ernest Fig. 4 is a sectional view taken on the line 5 Hope, Serial No. 755,962., filed December 4, 1934, IV-IV of Fig. 2; there is disclosed a disk type of tool wherein the Fig. 5 is a perspective view of the abrasive eleabrasive element is supported upon an inflatable ment used on the tool; and

ring. The abrasive element of that tool consists Fig. 6 is a view showing a joint in the abrasive 10 of a strip of abrasive sheet material molded to element. 10 conform to the periphery of the supporting ring. Referring to Fig. 1, the illustrated tool is shown The ends of the abrasive strip are adhesively in operation upon the breast surface of a heel H secured together in overlapping relation, and the of a shoe S. As illustrated, the tool is supported expansion of the ring by air pressure holds the upon the tapered end of a tubular spindle I!) which abrasive element in place. The tool disclosed in is driven by a y Suitable meanse tool com- 5 the present application is similar in the respects, prises a body portion in the form of a wheel l2 above mentioned to the tool disclosed in the which is conveniently made of aluminum and application of Ri k nd H which has a hub H1 in which is formed a socket It is an object of the present invention to profor receiving the end of the p d e ll- The tool vide an improved abrading tool of the character body 12 is of general discoidal form but its cen- 2 under consideration. In accordance with a featral portion is s w COnVeX toward the p ture of the invention, the expansible ring is redle l0. Slidably fitted over the hub I4 is a hub cessed at the lapped joint of the abrasive element of a a p m mb "5 of substanti lly the to avoid undue bulkiness at this locality. In the same diameter as the tool body l2. The periphillustrated tool the outer wall of the expansible ry of he to l bo y I is rec ed nd thetocl ring is of substantially the same thickness at the body I2 and the clamping member I6 have flanges recess as at the other portions of the ring in a a respectively, formed t ereon- A nut order to prevent bulging of the ring at this locality 22 is threaded upon the hub 14 in abutting re awhen expanded by air pressure. In accordance tion to the hub of the clamping member I6.

with a further feature, the expansible ring has Mounted upon th p p y of the tool dy 30 a gritty surface to prevent slip between the abra- I2 is an t b e ring 24 of rubbers ring sive element and the ring in order to insure that is shown in perspectiv in and the form the'lapped joint of the abrasive element will alof its radial section is shown in Fig- At the ways be in register with the recess in the exbase of the ring there extends inwardly a tongue pansible ring. The gritty surface of the ring is 26 by w h t ring is clamped between t d sk 35 obtained by incorporating particles of frictiona d t e 13 0 dy The p e I has an producing material, for example flint, in the peaxial passageway 23 which, a its pp d, is ripheral surface portion of the ring prior to treat- Connected With a y Suitable Source of a under ment of the ring in a vulcanizing mold. The pressure. A small tube 30 opens at one end into increased frictional characteristics of the ring rethe Socket 0f the end at its other end 40 sulting from such treatment are umcient to tends the Surface of the recessed overcome any tendency of the abrasive element perlnherel portlPn of t tool body wh to creep which might otherwise result from the the inflatable ring 24 is assembled in position frictional drag of the work upon the abrasive upon the tool Small opentng through: the

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w the afbove i other oblects featmjes The ring 24 is provided with an annular air chamin view, the 1nvent1on will now be described with her 32 which communicates with the above ref erence the accPmpanymg drawmg and mentioned opening in the tongue 25. Air under pomted out m Clalms' pressure will thus pass from the passageway 28 5 In the drawmg, 0 into the socket of the hub l4, thence through the Fig. 1 is an e1evat1onal view, partly in section, tube 30 and t pening in the tongue 25 into of the improved tool in operation upon the breast th air h b 32 t inflate th i 24 As surface o the S e e is shown in Fig. 4, the wall of the air chamber 65 2 is a View in PerspectiVe f ab e 2 is thinner at the peripheral portion of the ring than at its sides, in order that the air under pressure being introduced into the ring will cause the expansion of the ring to take place diametrically rather than transversely. The ring 24 may conveniently be made by vulcanizing together two suitable pieces of rubber in a mold, and as shown in Figs. 3 and 4, a strip 34 of canvas may be introduced at the joint at the base to strengthen the ring.

As shown in Figs. 1, 5 and 6, the abrasive element of the tool consists of an annular cover 36 of abrasive sheet material. The abrasive cover 36 has an inherent shape which is similar to that of the periphery of the ring 24. This shape may conveniently be obtained by a molding operation which is illustrated and described in the abovementioned application of Ricks and Hope. The cover is applied to the tool when the ring 24 is in deflated condition, an overlapping end of the cover being cemented to an underlapping end.

As so far described, the abrading tool, including the abrasive cover 36 is similar to the tool disclosed in the above-mentioned application of Ricks and Hope. In the present construction, however, the tongue 26 is not of dove-tail formation but is provided with annular recesses 38, 38 at its base to accommodate the flanges l8 and 20 of the tool body and clamping disk, respectively. As shown in Fig. 6, the overlapping end 3! of the abrasive cover 36 in forming the joint is of a re-entrant V-shaped outline so that the joint is of greater extent at the sides than at the center of the cover. In the ordinary use of tools of this character, the side surfaces of the abrasive cover are used more than the central portion and this form of joint gives added strength at the localities where strength is most required, without rendering the joint unduly bulky. The abrasive material need not be removed from the end portions of the cover 36 at the point and is preferably retained at least upon the overlapping end.

The surface portion of the ring 24 which underlies the abrasive cover has incorporated in it particles of grit to increase its frictional characteristics. This is accomplished by sprinkling minute particles of grit, for example flint, upon the surface of the ring prior to the treatment of the ring in a vulcanizing mold.

As shown in Fig. 2- the inflatable ring 24 has a recessed portion 40 in its peripheral surface. Fig. 3 represents a cross section of the ring taken through this recessed portion. The recessed portion is of a length somewhat in excess of the length of that joint of the abrasive cover. The depth of the recess is substantially equal to or slightly in excess of the thickness of the abrasive sheet material from which the covers are made, and the recess at each end terminates in a shoulder 42 which conveniently is not perpendicular to the adjacent surface but is inclined at an angle of about In order to prevent the absence of material at the recessed portion 40 from causing undue inflation of the ring at that locality, the ring is so formed that the annular air chamber 32 at the recessed portion is displaced inwardly toward the center of the ring a distance corresponding to the depth of the recess. Thus, as appears from the comparison of Figs. 3 and 4, the same amount of material is left between the peripheral surface of the ring and the annular air chamber, both at the recessed portion 43 and at the remaining portions of the ring, and uneven inflation is thereby prevented.

The abrasive cover 36 is applied upon the ring 24 when the latter is in deflated condition. The ends of the abrasive cover are cemented together in overlapping relation at the locality of the recess 40. the hollow 32, the expansion of the ring will hold the abrasive cover in place, and the gritty surface of the ring will prevent any tendency on the part of the abrasive cover to creep in such a manner as to move the joint away from the recess 40. The recess 40 insures an even surface of the abrasive cover notwithstanding the joint.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. An abrading tool comprising a supporting member and a cover of abrasive sheetmaterial mounted upon said supporting member, said abrasive cover having its ends adhesively secured together to form a lapped joint, and said supporting member being recessed at the locality of. the joint to prevent undue bulkiness at that locality.

2. An abrading tool comprising an expansible pad, and an annular abrasive cover carried by said pad and retained upon said pad by the expansive pressure of the latter, said abrasive cover having a lapped joint, and said pad having a recess to accommodate said lapped joint.

3. An abrading tool comprising an inflatable pad adapted to carry an abrasive cover and having a recess in its cover-supporting surface to accommodate a lapped joint in the abrasive cover.

4. An abrading tool comprising an inflatable pad having an outer surface adapted to carry an abrasive cover and having a recess in its outer surface to accommodate a lapped joint in the abrasive cover, the outer wall of said pad being of substantially the same thickness at said recess as at other portions of said pad.

5. An abrading tool comprising an annular inflatable pad, and an annular abrasive cover carried by said pad and retained upon said pad by the expansive pressure of the pad when the latter is inflated, said abrasive cover having a lapped joint, and said pad having a recess to accommodate said lapped joint, said pad having also particles of gritty material incorporated in its cover-supporting surface to prevent relative slip between the pad and the cover and thereby to When air pressure is admitted into keep the lapped joint in register with the recess.

WILLIAM RODERICK BARCLAY.

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