US2014069A - Buffing tool - Google Patents

Description

J. L. JONES BUFFING TOOL Filed April 19, 1933 Sept. 10, 1935.-

Patented Sept. 10, 1935 UNITED STATES ATE omer

BUFFING 'rooL Application April 19, 1933, Serial No. 666,841

4 Claims.

This invention relates to bufling tools and is herein disclosed as embodied in a bufling tool of the Naumkeag type. Buffing tools of this type consist of a rotary tool body carrying a disk of abrasive material and they are used extensively in buing shoe bottoms. It has been customary, when high grade work is desired, to provide a yieldable pad for backing the abrasive disk and to distend the pad by air pressure. Such air-inflated tools are particularly useful in bufng the shank portions of shoes, which portions are frequently curved in such a manner as to render them difficult of .access by ordinary buing tools. Air-inated tools, moreover, render it possible to obtain a soft, velvety finish which is superior to that resulting from the use of other types of tools.

An object of the present invention is to provide a buiing tool of the Naumkeag type having the desirable characteristics of an air-iniiated tool and which may readily be applied to machines not equipped for air pressure.

In accordance with a feature of the invention, there is provided a sleeve adapted at one end to t over a rotary spindle and having secured to it a screw for threadedly engaging the spindle, the sleeve having attached to its other end a tool body provided with a yieldable distendable pad for backing an abrasive cover, in combination with means for yieldably distending the pad. This construction results in a self-contained tool which may readily be attached to and detached from an ordinary spindle. The pad of the illustrated tool consists of a disk of felt reinforced by a disk of leather which is relatively thick at its central portion, and which tapers to a relatively thin margin. Such a pad, when distended by spring pressure, has the desirable characteristics of an airinated tool. It is convenient also to provide a plunger for transmitting the thrust of the spring to the distendable pad.

For a more complete understanding of the preferred embodiment of the invention, reference may be had to the accompanying drawing, which shows the improved bufling tool in longitudinal section.

'I'he improved tool is shown as attached to a shaft I0 having a truste-conical reduced end portion I2 in which is formed a threaded opening I4. Shafts of this type are very common in shoe repairing machines and are used for supporting various tools such, for example, as edge trimming tools which are mounted on the reduced portion I2 and are clamped there by means of a screw having threaded engagement with the opening I4. The shaft I0, as illustrated, constitutes an ordinary edge trimming tool spindle. The supporting structure of applicants improved bufng tool consists of a sleeve I6 having a knurled portion I8 adjacent to one of its ends and having secured within it by 5 means of a set screw 20, a block 22. The block 22 has formed in it a tapered opening to t the reduced end portion I2 of the spindle4 I0. Soldered to the block 22 is the head 24 of a screw 25. The screw 26 is thus, through the block 22, immovl0 ably secured to the sleeve I6. -The screw 26 eX- tends axially through the tapered opening of the block 22 and by reason of this arrangement the sleeve I6 may readily be attached to the spindle I0 by turning the knurled portion I8, thus threading 15"' the screw 26 into the opening I4. The sleeve I6 adjacent to its opposite end is internally threaded to receive a threaded shank 28 of a tool body having at its outer end a flange 343. A clamping disk 32 having a raised annular rim 34 is interposed be- 20 tween the ange 39 and the end of the sleeve I 6 so that, as the sleeve I6 is threaded upon the shank 28, the clamping disk 32 will be brought into clamping relation to the iiange 3i?. An abrasive disk 36 which is preferably molded and which 25 may have tabs formed in its marginal portion 35 is clamped between the flange 36 and the rim 34 with the marginal portion of the abrading disk 36 turned back over the inner face of the flange 30. Within the abrasive disk sa is a yieidabie distend- 30 able pad consisting of a felt disk 38 which directly supports the abrasive cover 36 against the pressure of the work and which has cemented to its inner face a leather disk lili which is relatively thick adjacent to its center portion and tapers to 35 relative thinness adjacent to its periphery. The tool body is bored to receive a plunger 42 having a flange 44, the outer face of which is convex for bearing against the leather disk 4E). The center of the leather disk Ml has formed in it an opening to 40 receive an extension 46 of the plunger l2 whereby the pad may be centered relatively to the plunger and to the tool body. The length of the extension 46 is less than the thickness of the central portion of the leather disk 36 to avoid any 45 possibility of the end of the extension 46 bearing directly against the felt disk 38. The thrust of the plunger 42 is thus transmitted to the leather disk 40 through the flange 44 at a locality which is substantially central with relation to the pad. 50 A slot 48, formed in the plunger ft2, is engaged by a screw 50 threaded into the tool body 28, thereby preventing undesired rotation of the plunger 42 while permitting axial or lengthwise sliding movement of the plunger relatively to the tool body. 55

Interposed between the screw-head 24 and a shoulder 52 formed on the plunger 42 is a coil compression spring 54. The screw head 24, together with the block 22, thus serves as an abutment for the spring 54.

When it is desired to replace the abrasive cover 36 by a fresh abrasive cover, the sleeve IG is unscrewed from the spindle IE). The operator, then grasping the working portion of the tool, partly unscrews the tool body 28 from the sleeve I6. The clamping pressure of the rim 34 is thus relieved and the old abrasive cover is readily removed. The operator then may apply a new abrasive cover merely by reversing the above-described operation, but ordinarily he will resort to a cover-applying tool of the type disclosed in United States Letters Patent No. 1,197,439 granted September 5, 1916, upon the application of E. F. Hodgkins. This cover-applying tool consists essentially of a support for the working face of the abrading tool and a plurality of wiping plates which engage the up-turned tabbed marginal portion of the abrasive cover and wipe it over the ange 3D of the tool body. With the tool body thus held in the applying device by the wiping plates, the operator now takes the sleeve I6 and screws it upon the threaded shank 28 of the tool body. This serves not only to clamp the marginal portion of the abrasive cover against the inner face of the flange 3@ but it serves also to compress the spring 54. The assembled tool may now be released from the coverapplying device and may be attached to the spindle Il) in the manner already indicated. It will be noted that the pad comprising the disks 38 and 40 is maintained in working position upon the tool body by the tension of the abrasive cover 36, being centered by the extension 4S of the plunger. The assembled tool is thus self-contained, having no loose parts which could be lost in shipment or storage, and it is ready for immediate attachment to a very common type of machine spindle. The effect of the spring pressure being transmitted into the pad through the leather disk 40, and particularly by reason of the fact that the leather disk 4B tapers to a relatively thin margin, imparts to the tool the soft yielding resilient characteristics of an air-innated tool.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. A buinng tool comprising a sleeve adapted at one end to t over a rotary spindle, a screw within said sleeve and rigidly and permanently secured to said sleeve in axial relation thereto for threaded engagement with an opening in the rotary spindle whereby the sleeve and screw are rotatable relatively to the spindle as a unit, a tool body attached to the opposite end of said sleeve and provided with a yieldable, distendable pad for backing an abrasive cover, and means for yieldably distending said pad.

2. A buffing tool comprising a sleeve adapted at one end to t over a rotary spindle, an abutment within said sleeve and secured thereto, a screw extending axially from said abutment for threaded engagement with an opening in the rotary spindle, a tool body attached to the opposite end of said sleeve and provided with a yieldable distendable pad for backing an abrasive cover, a plunger guided for axial movement in said tool body and arranged to exert a thrust against said pad, and a compression spring interposed between said plunger and said abutment and causing the plunger to distend the pad.

3. A bufhng tool comprising a sleeve adapted at one end for attachment to a rotary spindle and internally threaded at its opposite end, a tool body having a shank threaded for engagement with said opposite end of said sleeve, a yieldable distendable pad covering the working face of said tool body for backing an abrasive cover, a compression spring within said tool body for distending said pad, said sleeve having an abutment for one end of said compression spring, and a clamping disk loosely surrounding the shank of said tool body for clamping the marginal portion of an abrasive cover against the rear face of said tool body, said clamping collar being in abutting engagement with the threaded end of said sleeve, whereby the turning of the sleeve relatively to the tool body serves to compress the spring and also to cause the clamping disk to secure the abrasive cover to the tool body.

4. A bufng tool comprising a tool body adapted for attachment to a rotary spindle, a pad consisting of a disk of felt having secured upon one of its faces a disk of leather, the exposed face of the felt serving to afford backing to an abrasive cover, and means for applying localized pressure at substantially the center of said pad to distend the pad, the leather disk being relatively thick adjacent to its center and tapering to a relatively thin edge, whereby the pressure applied at the center of the pad is distributed in such a manner as to produce an effect similar to that of an air-inflated pad.

JOHN L. JONES.

Images