US1948674A - Abrading tool - Google Patents

Description

Feb. 27, 1934. w, A. REED 1,948,674

ABRADING TOOL Filed May 19. 1933 Patented Feb. 27, 1934 UNITED STATES PATENT GFFICE ABRADING TOOL Application May 19, 1933. Serial No. 671,881

9 Claims.

This invention relates to abrading tools and is herein disclosed as embodied in a scouring wheel of relatively large diameter such as is frequently employed for performing scouring operations upon lasts. Securing wheels of this type are ordinarily provided with a cloth abrading element such as emery cloth and because ofthe large diameter of the wheel and also by reason of the tendency of emery cloth to stretch, it has been found desirable to provide an arrangement for securing the emery cloth upon the wheel in such a manner as to take up as much slackness as possible. In scouring Wheels of relatively small diameter, or which are provided with a less stretchable abrading element'the abrasive cover scouring means disclosed in the application for United States Letters Patent SerialNo.` 613,885, filed May 27, 1932, in the name of William A. Reed, has proved satisfactory. in that arrangement, both ends of the `abrasive cover are clamped simultaneously.' However, in wheels of larger diameter, or in cases where a highly stretchable abrasive cover is employed, it becomes desirable to take up in advance as much oi the slack as possible.

It is, accordingly, an object ofthe present invention to provide an improved arrangement having the desirable characteristics above referred to for securing an abrasive cover upon a tool-body. In accordance with a feature of the invention, a

pair of members are provided for engagement' with the opposite ends, respectively, of an abrasive cover to secure the abrasive cover upon the toolbody, these members being operated by a mechanism which, upon initial movement, brings one ofthe members into cover-securing position while leaving the other member' free, and, upon continued movement, brings theotber member also into cover-securing position. This arrangement affords considerable advantage in dealing with stretchable abrasive covers or abrasiveY cov ers upon relatively large wheels inasmuch as it enables the operator to secure one end of the abrasive cover in position upon the wheel and then to stretch the abrasive cover as much as he desires before securing the other end. Such stretching serves to take up in advance a considerable portion if not all of the slack which is likely to develop during the use oi the tool.

The cover-securing mechanism herein illustrated, and which comprises a preferred embodiment of my invention, consists of a T-shaped clamping hook having a stem mounted in the tool-body for retraction relatively thereto and having a relatively rigid cross-bar outside of the tool-body. A pair of spring metal bars are secured to the stem and extend from opposite sides of the stem beneath and parallel to the relatively rigid cross-bar, and means are provided for retracting the stem to cause the spring metal bars to secure an end of the abrasive cover against the tool body, for example, by means of a pair of downwardly extending prongs with which the spring metal bars may be provided. The operator. may then stretch the abrasive cover, and

upon further retraction of the stem cause the relatively rigid cross-bar to clamp the other end of the abrasive cover against the spring metal bar.

With the above and other objects and features y 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 end view of a scouring wheel pro vided with the improved cover clamping mechanism;

Fig. 2 is a sectional view taken on the line II-II of Fig. 1; and

Fig. 3 is a perspective View of a portion of theabrasive cover used upon the wheel shown in Figs. 1 and 2.

The body of the illustrated scouring wheel consists of a hub 10, a core l2 consisting of a wooden disk, and a yieldable support 14 surrounding the periphery of the core 12. The hub 10 may be mounted in any convenient manner upon a shaft. It is a common practice to provide a scouring tool shaft with a shoulder and a threaded thrust collar between which the hub 10 of the illustrated scouring tool may be clamped. e yieldable support 14 in the illustrated tool is composed of y lflannel and is formed to a bulged or convex shape, as shown in Fig. 2, but it is to be understood that the periphery of the support 14. may be made cylindrical or in any other desired shape. A cylindrical opening 16, the axis of which is preferably radial, is formed in the core 12. Secured within the opening 14 by pins 18 is a barrel 20 having formed in its wall a helical cam slot 22. Mounted within the barrel 20 for both sliding and rotary movement relatively thereto is a cylindrical block 24 into which is threaded a pin 26. The pin 26 extends throughthe slot 22 and, upon being rotated by the operator, it bears against one or the other of the edges of the cam slot 22 and thus serves to move the block 24 axially within the barrel 2G. A recess 28 is formed in one face of the core 12 to accommodate the movement oi the pin 26. Threaded into the block 24 and extending axially thereof is a stem 30 of a clamping hook. This clamping hook is T- shaped and has a cross-bar 32 positioned outside the periphery of the felt support 14. In the illustrated tool, as above pointed out, the felt support is bulged or convex in cross-section. The crossbar 32 of the illustrated tool is accordingly curved so as to conform to the curvature of the felt cover. However, in the case of a cylindrical scouring tool the cross-bar 32 would be straight and, in general, whatever the shape of the periphery of the tool, it is a simple matter to shape the cross-bar 32 accordingly. Secured to each side of the stem 30 beneath the cross-bar 32 and substantially parallel thereto is a spring metal bar 34. Each of the spring metal bars 34 is provided with a downwardly extending prong 36. In the illustrated tool the spring metal bars 34 are secured to the stem 30 by rivets 38. A metal bridge 40 extends across the opening 16 and is secured to the core 12 upon each side of the opening 16 by screws 42. The stem 30 is provided with a square portion 44 which extends through a square opening in the bridge 40, thus serving to prevent rotation of the clamping hook. Below the square portion 44 the stem 30 is cylindrical.

An abrasive cover 46, which in the illustrated tool consists of emery cloth, is mounted upon the periphery of the felt cover 14. In the illustrated tool the abrasive cover 46 is molded to a convex form and the length of the strip is in bias relation to the weave to facilitate molding of the cover to the desired form. Because of the relatively large diameter of the wheel and the fact that the abrasive cover is of emery cloth applied in bias relation to its weave, there is a considerable tendency on the part of the abrasive cover to stretch. A V-shaped slit 48 is formed in each of the ends of the abrasive cover 46 to accommodate the upper portion of the stem 30 which is reduced in width to form a relatively thin neck as shown in Fig. 2. The edge of the abrasive cover 46 is indicated in the drawing by the numeral 50.

To facilitate assembling of the cover-securing mechanism above described, the cylindrical block 24 is formed with two diametrical bores 52 and 54, respectively, which intersect substantially at right angles to each other and which are below the threaded opening which receives the pin 26. One or the other of the bores 52 or 54 may be engaged by a tool to hold the block 24 stationary while the lower end of the stem 30 is threaded into it. The pin 26, which has not yet been threaded into the opening provided for it, may thus be utilized as a tool to engage the bores 52 or 54. The block 24 will now occupy a position somewhat above that shown in Fig. 2, and the cylindrical portion of the stem 30 will extend through the square opening in the bridge 40. The stem 30 may now be freely turned until it has been threaded to the desired extent into the block 24. The holding tool is them removed from the bore 52 or the bore 54, and the clamping hook is pushed down, with the cross bar 32 extending across the periphery of the tool-body. The square portion 44 will engage the square opening provided for it in the bridge 40, and will thus maintain the cross-bar 32 in proper alinement. The pin 26 is then threaded into the opening provided for it in the block 24.

In the illustrated tool, the threads on the stem 30 are directed oppositely to the cam slot 22, so that rotation of the block 24 will serve to augment the extent of axial movement which is transmitted from the block 24 to the stem 30.

In applying the abrasive cover 46 upon the wheel body, one end of the abrasive cover is positioned beneath the spring bars 34 with the neck of the stem 30 Within the slit 48. The operator then rotates the pin 26 toward the right, as viewed in Fig. 1, which retracts the stem 30 suiiiciently to cause the prongs 36 to penetrate an end of the abrasive cover and to become embedded in the felt cover 14, thus securing that end of the abrasive cover in position on the tool-body. The operator then stretches the abrasive cover tightly around the periphery of the tool-body, inserts the opposite end of the tightly stretched cover loetween the rigid cross-bar 32 and the spring bars 34 with the neck portion of the stem 30 within the slit 48 upon that end of the abrasive cover and rotates the pin 26 further to the right thus causing further retraction of the stem 30. As the stem is thus further retracted the spring bars 34 yield until the rigid cross-bar 32 clamps the stretched abrasive cover securely against the spring bars 34. When the pin 26 has been rotated fully to its clamping position it lies wholly within the recess 28 and below the surface of the core 12, so that it will be out of the wayV when the wheel is in operation.

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

1. An abrading tool comprising a tool-body constructed and arranged to support an abrasive cover, a member adapted upon engagement with one end of an abrasive cover to hold that end of the abrasive cover against movement on said tool-body, a second member engageable with the other end of the abrasive cover to hold said other end, and operating means for said holding members constructed an-d arranged upon initial movement to move the first-mentioned member into cover-holding position while leaving the secondmentioned member free, and upon continued movement to move the second-mentioned member into cover-holding position while maintaining the first-mentioned member in cover-holding position.

2. An abrading tool comprising a tool-body constructed and arranged to support an abrasive cover, a yieldable member engageable with one end of an abrasive cover to secure that end on said tool-body, a second member engageable with the other end of the abrasive cover to secure said other end, and a common operating means for said members, said yieldable member being constructed and arranged to enter into coversecuring position before the second-mentioned member and, by yielding, to permit the secondmentioned member to enter into cover securing position.

3. An abrading tool comprising a tool-body constructed and arranged to support an abrasive cover, a stem mounted in said tool-body for retraction relatively thereto, a spring metal member secured to said stem outside of said tool-body and adapted to hold one end of an abrasive cover upon the tool-body, a relatively rigid clamp secured to said stem outside of said spring metal member for exerting clamping pressure upon the other end of the abrasive cover, and means for retracting said stem to cause said spring metal member to enter into cover-holding position and then, as said spring metal member yields, to cause said relatively rigid clamp to enter into clamping position.

4. An abrading tool comprising a tool-body constructed and arranged to support an abrasive cover, a clamping hook having a stem mounted in said tool-body for retraction relatively thereto and having a relatively rigid clamping bar outside of said tool-body, a spring metal bar secured to said stem between said relatively rigid clamping bar and the surface of said tool-body, and means for retracting said stem to cause said spring metal bar to hold one end of an abrasive cover upon said tool-body and then, as the spring metal bar yields, to cause the relatively rigid clamping bar to clamp the opposite end of the abrasive cover against said spring metal bar.

5. An abrading tool comprising a rotary toolbody, an abrasive cover surrounding said toolbody with the ends of the abrasive cover in overlapping relation, a T-shaped clamping hook having a stem mounted in said tool-body for retraction relatively thereto and having a relatively rigid cross-bar outside of said tool-body, a pair of spring metal bars secured to said stem and extending from opposite sides of said stem beneath and parallel to said relatively rigid cross-bar, and means for retracting said stem to cause said spring metal bars to secure the overlapped end of the abrasive cover upon said tool-body, and, upon further retraction of said stem While said spring metal bars yield, to cause said relatively rigid cross-bar to clamp the overlapping end of the abrasive cover against said spring metal bars.

6. An abrading tool comprising a rotary toolbody, an abrasive cover surrounding said toolbody with the ends of the abrasive cover in overlapping relation, a clamping hook having a stem mounted in said tool-body for retraction relatively thereto and having a relatively rigid clamping bar outside of said tool-body, a spring metal bar secured to said stem between said relatively rigid clarnping bar and the surface of said tool-body, a prong secured to the under surface of said spring metal bar and extending toward said tool-body, and means for retracting said stem to cause said prong to penetrate the overlapped end of said abrasive cover to secure said overlapped end against the toolbody, said retracting means being operable upon further movement, as the spring metal bar yields, to cause the relatively rigid clamping bar to clamp the overlapping end of the abrasive cover against the spring metal bar.

7. An abrading tool comprising a tool-body adapted to support an abrasive cover, a hook for securing an abrasive cover to said tool-body, said hook having a hook-bar outside of the tool-body and a stem extending into said tool-body, a member rotatable about the stem of said hook, said rotatable member being constructed and arranged to retract said hook upon rotation of said inember, and means on said tool-body constructed and arranged for non-rotary engagement with the stem of said hook to maintain said hook in a desired position of alinement notwithstanding the rotation of said rotary member.

8. A device for securing an abrasive cover upon a tool-body, comprising a hook having a stem and a relatively rigid clamping bar extending from one end of said stern, the opposite end of said stem being constructed and arranged for engagement with a retracting mechanism, and a spring metal bar secured to said stem below and adjacent to said relatively rigid clamping bar, whereby upon initial retraction of the stem the spring metal bar will secure an end of the abrasive cover against the tool-body, and upon further retraction of the stem the spring metal bar will yield and the relatively rigid bar will clamp the opposite end of the abrasive cover against the spring metal bar.

9. A device for securing an abrasive cover upon a tool-body, comprising a T-shaped hook having a stem and a relatively rigid cross-bar, the opposite end of said stem being constructed and arranged for engagement with a retracting mechanism, a pair of spring metal bars secured to said stem adjacent to and below said cross-bar and extending substantially parallel to the arms of said cross-bar respectively, and a prong extending from the undersurface of each of said spring metal bars, whereby upon initial retraction of the stem the prongs will engage an end of the abrasive cover and secure that end against the tool-body, and upon further retraction of the stem the spring metal bars will yield and the relatively rigid cross-bar will clamp the opposite end of the abrasive cover against the upper surfaces of the spring metal bars.

WILLIAM A. REED.

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