US2437650A - Abrading tool - Google Patents

Description

AU 323 EX FIP8109 March 9, 1948. H. PALMER ABRADING TOOL Filed May 22, 1946 LEVI H. PALMER Patented Mar. 9, 1948 UNITED STATES PATENT OFFICE ABRADING TOOL Levi Hester Palmer, Childersburg, Ala.

Application May 22, 1946, Serial No. 671,475

8 Claims. (Cl. 51-194) This invention relates to improvements in abrading tools, and in particular to an abrading or sanding roll of the type in which a sheet of abrasive material is secured about the periphery of a rotary cylindrical body or roll by securing means mounted internally thereof. While not limited thereto, the sanding roll of the present invention has special utility in the manufacture and/or rebuilding of shoes, for example, in sanding the shank of the shoe after placing on a new sole, in subsequent buffing and polishing operations, and the like.

A principal object of the invention is the provision of an abrasive or sanding roll characterized by improved and durable construction, and which is thoroughly dependable in use, Another object of the invention is the provision of a sanding roll of the type in which a sheet of abrasive material is secured about the periphery of a cylindrical body member, and which incorporates improved means for clamping the ends of the abrasive sheet, and for tightening the sheet to the degree desired by the operator or required for a particular sanding, bufiing, polishing or like operation, and which also permits ready replacement of a worn abrasive sheet or substitution of one type of sheet for another.

Other objects will be in part obvious and in part hereinafter pointed out in connection with the following analysis of this invention wherein is illustrated in detail a preferred embodiment of the invention.

In the drawings- Fig. 1 is a side elevational view of a sanding roll according to the invention, shown as secured in a hub drivingly connected with a powered shaft or spindle;

Fig. 2 is an end view of the sanding roll shown in Fig. 1;

Figs. 3 and 4 are views turned 90 one from the other, illustrating the improved sheet clamping means according to the invention;

Figs. 5 and 6 are detail views illustrating the two-part construction of the improved clamping means; and

Figs. 7 and 8 are section views taken on lines 1-! and 88, respectively, of Fig. 3.

Referring to the drawings, wherein like reference characters designate like parts throughout the several views, reference character l0 designates a rotary cylinder, one end thereof bein formed solid and terminating in a reduced diameter, axial stem II which is screw-threaded into an end bore of a hub l2, the latter being formed with a. socket adapted to receive a power-driven 2 shaft I3. through which latter the tool is powerdriven. Suitable means are provided to afiix the hub l2 to the shaft l3, for example a set screw l4.

The other end or working end of the cylinder is longitudinally bored, the bore ll thereof (Fig, 2) being offset slightly from the axis of the cylinder, so that the arcuate wall defining the tubular end thereof is thinner in one portion of its arcuate length than in its opposite portion. The cylinder bore Il extends approximately three-quarters the length of the cylinder and terminates in a small diameter bore extension Ila, the purpose of which is to center the sheet clamping pin to be described within the cylinder bore ll.

As seen in Figs. 1 and 2, the tubular or sleevelike end of the cylinder is provided with a longitudinally extending slot [8, through which the ends of an abrasive sheet l9 disposed about the periphery thereof extend into the bore ll wherein they are secured. Preferably, the slot [8 is cut through the thinner side or portion of the tubular wall of the cylinder, whereby the working end of the cylinder has a limited degree of yield.

According to the invention, the sheet clamping means takes the form of a clamp pin of two-part construction as shown in Figs. 3 and 4, the pin parts being hereinafter referred to as the main and complemental pin parts. The main pin part generally designated 22 is formed with a full circular mounting end 22a of diameter slightly less than that of the cylinder bore I1, and with a half-round clamping end 22b having a flat clamping face 220 extending the length thereof. The half-end wall or face 22d at the juncture of the mounting and clamping ends of the pin-part is inclined as shown, and similarly the end face of the half-round clamping end is inclined as at 22s, it being observed that the inclination of the faces 22d and 22e is approximately the same. Said inclined faces function as wedging surfaces as will appear hereinafter.

In its mounting end, the main pin-part is provided with 'a circular groove 22) in which the shank end of a set screw 24 is adapted to prolect. By reference to Fig. 1, the set screw is threaded into the sleeve end of the cylinder, its head seating'in a counter-sink provided in the periphery thereof. The set screw is adapted not only to project into the groove 22 for the purpose of holding the pin-part 22 within and against axial separation from the cylinder, but

also, upon tightening thereof, to engage against the groove bottom, thereby to secure the pin-part in any angular position to which it has been adiusted. The full circular mounting end 22a of 3 the pin terminates in a reduced diameter stem 229 (which may be threaded) and which is adapted to extend into the reduced-diameter end Ila of the cylinder bore I1, thereby to center the pin in the bore.

As best seen in Figs. 4 and 8, the full circular end of the pin is provided with a narrow-width slot 22h which extends rearwardly from the inclined end face 22d thereof and opens through said face for a portion of the length of the latter, as generally shown in Fig. 6. An angled tongue 22k projects outwardly from the inclined end face He or the half-round clamping end 22b of the pin-part, as shown in Figs. 3, 4 and 7.

The eomplemental pin-part generally designated 23 as shown comprises a half-round clamping end 2311 having a fiat clamping face 231) and terminating at one end in an inclined end face 230, and its other end being formed as a full circular head 23d kerfed to provide an inclined face 23c. The inclination of the faces 23c, 23c of the pin part 23 is opposite to that of the faces 22d, 22c of the pin-part 22, whereby, as seen in Fig. 3, the inclined faces 22d, 23c and 22e, 23c function upon assembly of the pin-parts to full formation as wedging surfaces which tend to bring the parts together as the pin-part 23 is moved endwise to mate with the pin-part 22.

The full circular head end 23d of the complemental pin-part is provided with a cross slot 23 (Figs. 2 and 4) adapted to receive the blade of a turning tool, for example, a screw driver. The cross slot is also adapted to receive the angled tongue 2210 of the pin part 22 in final assembly. At its opposite end the complemental pin-part is provided with a longitudinal tongue 23g which projects from the inclined end face 23c thereof, and is adapted to extend into the slot 2271. provided in the full-circular end of the pin-part 22 in assembly. The tongues 22k and 239 function as keys and, in conjunction with the inclined end faces of the parts, insure that turning motion applied to the pin-part 23 by a screw driver or like too] is transmitted to the pin-part 22 as well.

To secure an abrasive sheet in the cylinder lo, the main pin-part 22 is disposed within the bore l1 thereof and initially secured against axial separation by turning the set screw 24 an amount suflicient to project its shank end into the circular groove 22; of the part. The sheet of abrasive is then wrapped about the periphery of the cylinder and its ends passed through the cylinder slot I8. For such operation, it will be assumed that the pin-part 22 has been rotated to an angular position such that the ends of the sheet being secured may enter the cylinder bore l1 and be disposed generally parallel to the fiat clamping face 22c of the pin-part. With the ends of the sheet arranged as aforesaid, the complemental pin-part 23 is now inserted axially into the bore, being positioned so as to clamp the ends of the sheet between its clamping face 23b and the clamping face 220 of the pin-part 22. As the complemental pin-part mates with the main pin-part, it will be observed that the inclined end faces of both are axially efiective so that the axial insertion of the pin-part 23 tends to wedge or cam the parts together, whereby the ends of the sheet are secured with a force which increases with the amount of inserting force applied to the pin-part 23. Mating of the pin-parts also results in tongue 2270 of pin-part 22 seating in the head slot 23f or pin-part 23 and similarly in tongue 23g of the pin-part 23 passing into the slot 22h of pin-part 22, with the result that the pin-parts are keyed to each other for rotation in unison.

With the sheet ends now clamped between the clamping faces of the pin parts, the pin assembly may now be turned about its axis by inserting the blade of a screw-driver, for example, into the head slot 23f of pin part 23. This turning movement, although applied directly to the complemental pin-part 23, is transmitted to the main pin-part 22 by the inclined face and the key and slot connection of the pin-parts as described. The applied turning movement acts to draw the ends of the abrasive sheet further into the cylinder bore, thus insuring that the portion of the sheet disposed about the periphery of the cylinder is drawn taut as well as tensioned to the degree suiting the operators desires or to the requirements of the particular work. Upon the sheet being sufficiently tensioned, screw 24 is tightened, thereby to secure the two pin-parts to the cylinder in their angular position of adjustment to which they have been turned.

It will be observed that the two-part clamping pin assembly as described provides a simple yet thoroughly dependable means for securing the ends of an abrasive sheet about a rotary cylinder or roll. The free removability of one pin-part from the cylinder bore is of particular advantage in permitting easy insertion of the sheet ends when it is desired to apply the sheet to the roll, to replace a worn sheet, or to substitute one type of sheet for another. Moreover, the two-part construction of the holding pin permits the tightening of the abrasive sheet on the roll or cylinder, as may be required, in simple yet effective manner.

While an abrasive or sanding roll according to the invention is particularly useful in sanding the shank of high-heel shoes after placing on a new sole, it may also be employed in subsequent buffing and polishing operations, and for these latter operations, sheets of buffing and polishing material are substituted for the emery cloth used in sanding. Rolls incorporating the special sheet clamping means herein disclosed may of course be made up in any of the sizes required for the variety of operations for which it is useful.

With the sanding roll as described may be supplied a collar 30 as shown in Fig. 1, which is adapted to be slipped over the operating end of the roll after the abrasive sheet is secured, and thereupon fastened in desired adjusted position on the roll by a holding screw 3 I. The collar may serve as a guide or stop when the roll is used to sand around the edges of a thin halfsole of a womans shoe, particularly when the sole is cemented on and is of such thinness that it cannot be trimmed with the usual trimmer generally employed for this purpose.

As many changes could be made in carrying out the above construction without departing from the scope of the invention. it is intended that all matter contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. An abrading roll of the character set forth. comprising an elongated cylindrical member having a solid driving end, the other end of the member being tubular and having a longitudinal slot in its tubular wall, a sheet of abrasive material disposed about the periphery of the tubular end of the member with its ends passing through the slot, and clamping means contained in said tubular end and being operative to secure the ends of the abrasive sheet comprising a part mounted for rotation relative to but being normally secured against axial separation from said member, and a second part mounted to rotate in unison with said first part but being axially separable therefrom and removable from the member.

2. An abrasive roll as set forth in claim 1. wherein the said parts have coacting provisions whereby rotary motion applied to the second part is transmitted to the first part.

3. An abrading roll of the character set forth, comprising an elongated cylindrical member having a solid driving end, the other end of the member being tubular and having a longitudinal slot in its tubular wall, a sheet of abrasive material disposed about the periphery of the tubular end of the member with its ends passing through the slot, and clamping means contained in said tubular end and being operative to secure the ends of the abrasive sheet comprising a two-part clamping pin, of which one part is mounted for rotation relative to but is normally secured against axial separation from the member, and the other pin-part is adapted to rotate in unison with said first part but is axially separable therefrom and from said member.

4. An abrading roll of the character set forth, comprising an elongated cylindrical member having a solid driving end, the other end of the member being tubular and having a longitudinal slot in its tubular wall, a sheet of abrasive material disposed about the periphery of the tu bular end of said member with its ends passing through the slot, and a two-part clamping pin disposed in said tubular end and being adapted to receive between the parts thereof the ends of the abrasive sheets, the pin-parts being provided with coacting axially eflective wedging surfaces whereby in axial assembly of the pin parts, the ends of the abrasive sheet are clamped therebetween.

5. An abrading roll as set forth in claim 4, wherein one of the clamping pin-parts is secured against axial separation from said member.

6. An abrading roll as set forth in claim 4, wherein one of the clamping pin-parts is secured against axial separation from said member, and wherein both said clamping pin-parts are provided with mutually coacting means whereby rotary motion applied to the other pinpart is transmitted to said one pin-part.

7. An abrading roll of the character set forth,

comprising an elongated cylindrical member, one end of the member being tubular and having a longitudinal slot in its tubular wall, a sheet of abrasive material disposed about the periphery of the tubular end of said member with its ends passing through the slot, and a two-part clamping pin adapted for axial assembly and being operative to receive between the parts thereof the ends of the abrasive sheets, the pin-parts being provided with coacting axially effective wedging surfaces whereby in the axial assembly of the pin-parts the ends of the abrasive sheet are clamped therebetween, and with mutually coating tongue and slot connections whereby rotary motion applied to one of the pin-parts is transmitted to the other pin-part.

8. An abrading roll of the character set forth, comprising an elongated cylindrical member, one end of the member being tubular and having a longitudinal slot in its tubular wall, a sheet of abrasive material disposed about the periphery of the tubular end of said member with its ends passing through the slot, and a two-part clamping pin adapted to receive between the parts thereof the ends of the abrasive sheets, one pinpart being secured in and against axial separation from said member and including a full circular mounting end and a half-round clamping end having a flat clamping face, the other pin part being freely separable from said member and including a half-round clamping end having a flat clamping face and a head provided with a tool-receiving slot, said pin parts be ing provided with coacting wedging surfaces functioning to wedge the parts together in assembly thereof whereby to clamp the ends of the sheet disposed between their clamping faces, and with mutually coacting pin and slot connections providing for transmission of rotary motion applied to said other pin-part to said one pin-part.

LEVI HESTER PALMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 505,683 Stubbe Sept, 26, 1893 1,326,836 Bendix et a1 Dec. 30, 1919 1,374,052 Brauner et a1. Apr. 5, 1921 1,631,798 Davol June 7, 1927

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