US2072129A - Abrading tool - Google Patents

Description

March 2, 19370 F. HICKS ET AL 3 9 ABRADING TOOL Filed Dec. 4, 1934 Patented Mar. 2, 1937 UNITED STATES ABRADING TOOL Fred Ricks and Ernest Hope, Leicester, England,

assignors to United Shoe tion, Paterson, N. J., Jersey Application December 4, In Great Britain 2 Claims.

This invention relates to abrading tools and is herein disclosed as embodied in a disk type of tool such as is used in bufilng the shank and heel breast surfaces of shoes. In United States Letters Patent No. 2,025,125, granted December 24, 1935 upon our application, we disclosed a disk type of tool the abrasive element of which consists of a strip of abrasive sheet material molded to conform to the peripheral portion of the tool in body. The abrasive element of the tool disclosed in the present application is similarly molded to conform to the periphery of the tool body. In tools of this type, wherein only the marginal portion of the tool is used, a considerable saving of i5 abrasive material results from employing a strip of abrasive material rather than a large sheet which covers the entire face of the tool.

It is an object of the present invention to provide an improved abrading tool of the character 20 under consideration. In accordance with a feature of the invention, an inflatable ring is mounted upon the rim of a wheel-like member having a hub which is adapted for attachment to a rotary spindle, and a clamping disk is provided 25 which has a hub fitting over the hub of the wheel-like structure, to clamp a dove-tail annular tongue extending from the inflatable ring against the rim of the wheel-like structure.

With the above and other objects and features 30 in view, the invention will now be described with reference to the accompanying drawing, and pointed out in the claims.

In the drawing,

Fig. 1 is an elevational View partly in section 35 of the improved tool in operation upon the breast surface of a shoe heel;

Fig. 2 is a bottom plan view of the tool shown in Fig. 1;

Fig. 3 is a view in radial section (drawn to a 40 larger scale) of the peripheral portion of the tool shown in Fig. 1,-

Fig. 4 is a view similar to Fig. 3 but showing a modification;

Fig. 5 is a plan view of a piece of woven abra- 45 sive sheet material illustrating the direction in which a strip is cut to form an abrasive element therefrom;

Fig. 6 is an elevational view of a molding device; and

Fig. 7 is a view in perspective of a molded abrasive element ready for application to a tool such as is shown in Fig. 1.

Referring to Fig. 1, the illustrated tool is supported upon the tapered end portion of a tubular 55 spindle I III which is driven by any suitable means.

Machinery Corporaa corporation of New 1934, Serial No. 755,962 February 6, 1934 The tool comprises a body portion in the form of a. wheel I03 which is conveniently made of aluminum and which has a hub I05 in which is formed a socket for receiving the end of the spindle WI. The tool body I 03 is of general discoidal form, but its central portion is somewhat convex toward the spindle I III. Slidably'fitting over the hub I05 is a hub of a clamping member ill! of substantially the same diameter as the tool body I03. The periphery of the tool body I03 is recessed, and the tool body I03 and the clamping member I07 have flanges I09 and II! respectively formed thereon. A nut I I3 is threaded upon the hub I05 in abutting relation to the hub of the clamping member I01.

Mounted upon the periphery of the tool body I03 is an inflatable tubular ring N5 of rubber. The form of this ring in radial section is shown in Fig. 3. At the base of the ring there extends inwardly a dove-tail tongue III, so shaped as to be firmly gripped between the shoulders I09 and III. The spindle IIII has an axial passageway III! which at its upper end is connected with any suitable source of air under pressure. A small tube I 2| opens at one end into the socket of the hub I05 and at its other end extends slightly beyond the surface of the recessed peripheral portion of the tool body I03. When the inflatable ring II5 is assembled in position upon the tool body, a small opening through the tongue III of the ring registers with the projecting end of the tube I2I to form an air-tight joint. The ring H5 is provided with an annular air chamber I23 which communicates with the above-mentioned opening in the tongue II'I. Air under pressure will thus pass from the passageway II9 into the socket of the hub I05, thence through the tube I 2| and the opening in the tongue II'I into the air chamber I23 to inflate the ring II5. As is shown in'Fig. 3, the wall of the air chamber I23 is thinner at the peripheral portion of the ring than at its sides, in order that when air under pressure is introduced into the ring the expansion of the ring will take place diametrically rather than transversely. The ring II5 may conveniently be made by vulcanizing together two suitable pieces of rubber in a mold and, as shown in Fig. 3 a strip I25 of stout non-elastic fabric such as canvas may be introduced at the joint at the base to strengthen the ring and to prevent diametrical expansion of the tongue portion of the ring. The lines I26 (Figs. 3 and 4) represent the junction of the two pieces of rubber prior to vulcanization; after vulcanization the two pieces of rubber are united to form an integral ring.

As shown in Figs 1 and 2, the abrasive element of the tool consists of an annular cover I21 of abrasive sheet material. This cover, before application to the tool, is shown in Fig. 7. The cover I21 has an inherent shape which is similar to that of the periphery of the ring H5. This shape may conveniently be obtained by a molding operation which will later be described. The cover is applied to the tool when the ring H5 is in deflated condition, an overlapping end of the cover being cemented to an underlapping end. As shown at I49 in Figure 7, the abrasive material is removed from the cover at the joint to avoid undue thickness of the joint. With the abrasive cover it? thus applied to the ring H5, inflation of the ring will cause the ring to expand diametrically and thereby hold the cover I21 firmly place. It will be evident that not only the peripheral marginal portion H29 of the cover i2! is available for buffing or scouring, but also the portions lti of the cover adjacent to the periphery at each side thereof. These surfaces l3i are inclined at a substantial angle to the axis of rotation of the tool.

The external diameter of the illustrated tool is substantially six inches. In Fig. 1 the tool is shown in operation upon a breast surface of a shoe S having a heel it will be noted that by reason of the relatively large diameter of the tool, ample clearance is provided for the spindle and for the hub oi the tool.

In the shoe S, as shown in Fig. i, the locality of the shoe bottom at the junction between the shanl: and the heel breast surface has a substantiaii radius of curvature and there is no difficulty in bringing the scouring surface or the above-described tool to bear properly upon it. In the case of shoes wherein there is a sharp angle between the heel breast surface and the shank. it is convenient to employ a tool. having an infiatable ring such as is shown in Fig. 4 which is more sharply wedge-shaped at its periphery to enable the abrasive element to operate upon such angular portion of the shoe.

The abrasive cover 82? is conveniently formed from a strip of woven abrasive sheet material which, as illustrated in Fig. 5, is out on the bias from a large sheet The direction of the weave of the material is indicated at it? in Fig. 3. A strip i3?) is shown as having been cut at an angle of about 30 After the strip i139 has been cut, it is well moistened to soften it and is then molded upon a forming member Ml. As shown in Fig. 6, the forming member Ml comprises a wooden cylinder having a helical projection M3 in the nature of a large screw thread formed therearound. One

to the weave of the fabric.

end of the damp strip H9 is secured to the helical portion M8 by any suitable means such as a pin I45, whereupon the strip is wrapped around the helical projection under tension, the strip being pulled in a more or less tangential direction, as indicated by the arrow Ml. Under the influence of this tension the strip will conform itself to the surface of the helical projection. When a sufilcient length of the strip has thus been wrapped along the projection the free end of the strip is secured in place by another pin and the strip is left to dry upon the former. When the band is dry and removed from the former, it will be found to be in such firmly molded condition that it retains its molded shape satisfactorily under ordinary conditions of use. The external diameter of the forming member ifill is preferably somewhat less in diameter than the cover it? when in use. The efiective opening out of the molded strip to a somewhat larger diameter tends to increase to some extent the sharpness of the angle between the side portions till or the strip and thus tends to cause the strip to grip the rim of the inflatable ring lib. In using a helical forming member of the type above described, any desired length oi strip can be molded in a single operation.

A further improvement upon abrading tools of the type above described is disclosed and claimed in the application for Letters Patent of the United States Serial No. Z55,972, filed December a, 193% in the name oi William Roderick harclay.

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

3.. An abrading tool comprising a wheel having a hub adapted for attachment to a rotary spindle, an inflatable tubular ring mounted upon the rim oi said wheel for carrying an. abrasive cover, a clamping disl having a hub which fits over the hub of said wheel, said inflatable ring having an inwardly extending annular dove-tail adapted to be clamped between he rim of said wheel and the peripheral portion o3 said clamping dislr, and means for retaining said clamping dlslr in clamping position.

2. An abrading tool comprising a rotary tool body, an elastic tubular ring mounted on said tool body, said ring having within it an annular air chamber, said ring having also an annular inwardly extending tongue, means engageable with said tongue for securing said ring to said tool body, and a non-elastic reinforcing member secured within said tongue to prevent diametrical expansion of the tongue portion of the ring when the ring is inflated.

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