US2818693A

US2818693A - Abrasive wheel

Info

Publication number: US2818693A
Application number: US616014A
Authority: US
Inventors: Russell W Bernstein; Block Aleck
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-10-15
Filing date: 1956-10-15
Publication date: 1958-01-07
Anticipated expiration: 1975-01-07

Description

1958 R. w. BERINSTEIN ETAL 2,818,693

, ABRASIVE WHEEL Filed Oct. 15, 1956 INVENTORS RUSSELL w. BERNSTEIN V ALECKQ BLOCK ATTORNEY United States Patent ABRASIVE WHEEL Russell W. Bernstein and Aleck Block, Culver City, Calif. Application October 15, 1956, Serial No. 616,014

7 Claims. (Cl. 51-194) This invention relates to an abrasive wheel which is adapted to be used for polishing and grinding purposes. This invention is a continuation-in-part and improvement upon the invention disclosed in our co-pending application Serial No. 539,622, filed October 10, 1955.

It is an object of our invention to provide a wheel which is formed entirely of cardboard, paper and similar economical and disposable materials so that it can be easily discarded and replaced when it has become worn. Our wheel in use is supported by rigid metal flanges which impart to it sufiicient rigidity so that it can perform cutting operations beyond those normally achieved by ordinary abrasive wheels formed of such materials.

It is a further object of our invention to provide an abrasive wheel which is adapted for use in grinding and polishing concave surfaces and which can also be used fora large variety of grinding, cutting and polishing operations.

In essence, our invention contemplates a substantially circular wheel, around the outer periphery of which extend a plurality of overlapping segments of abrasive coated material. The wheel comprises a complete unit which is capable of easy handling and shipment. In use, the ends of the abrasive segments are held between a pair of metal flanges which prevent their separation from the wheel.

It is an object of our invention to provide an abrasive wheel having the advantages and benefits of the structure set forth above. It is a further object of our invention to provide a wheel of the type described in which the abrasive segments overlap each other a substantial amount, so that as the exposed portions become worn, new abrasive is exposed from the portion of the abrasive segment disposed therebeneath, thus providing fresh abrasive and extending the life of the wheel.

It is a further object of our invention to provide such a wheel in which the use of segments of abrasive material extending substantially transversely to the periphery of the wheel permits the formation of an abrasive wheel having a small radius without buckling or folding .of the abrasive material.

Another object of our invention is to provide a wheel of the type described which is light in weight, simple and economical to manufacture and easy to replace when it has become worn. It is among the further objects of our invention to provide such a wheel which is sturdy in construction and in which the abrasive segments will not become separated from the wheel in use.

Our invention also comprises such other objects, advantages and capabilities as will later more fully appear and which are inherently possessed by our invention.

While we have shown in the accompanying drawings a preferred embodiment of our invention, it should be understood that the same is susceptible of modification and change without departing from the spirit of our invention.

ice

Referring to the drawings,

Fig. 1 is a side elevational view of our abrasive wheel, partly broken away to show the interior structure;

Fig. 2 is an end view of our abrasive Wheel in use, partly broken away and shown in section;

Fig. 3 is a perspective view showing attachment of the abrasive segments to the mounting strip;

Pig. 4 is an enlarged perspective view showing the abrasive segments and mounting strip prior to their attachment to the core;

Fig. 5 is a side elevationalview of the wheel in use, partly detailed in section and partly indicated in dotted lines; v

Fig. 6 is a side elevational view of the core before mounting the abrasive segments thereon.

A preferred embodiment which has been selected to illustrate our invention comprises a core 10, which is preferably formed of twisted paper. The core 10 is preferably circular in cross-section. A length of the core 10 sufficient to form a wheel of the desired circumference is cut from a long strip and its ends secured together by tape 11 or other suitable attaching means. The result is the provision of a circular core 10 as shown in Fig. 6 of the drawings.

A plurality of abrasive segments 12 are then cut or otherwise suitably formed from a length of abrasive carrying material such as paper, cloth or the like. Each of the abrasive segments 12 is preferably substantially oblong in shape. The segments 12 are then arranged in a straight line, with their longer edges adjacent each other. The segments 12 are preferably disposed in an overlapping relationship in which each segment 12 overlaps half of the next adjacent segment 12.

A mounting strip 13, which may be formed of paper, cloth or plastic tape or other suitable material is then attached by glue or the like so that it extends transversely along the strip of segments 12, being secured to the non-abrasive side of each of the segments 12. This structure is best shown in Fig. 3 of the drawings.

The ends of the abrasive segments 12 are then brought up so as to form a channel, as best shown in Fig. 4 of the drawings. The circular core 10 is then fitted within this channel, the strip of segments 12 being curved around the core 10. The length of the strip of segments12 should, of course, be equal to the circumference of the core 10.

A pair of cardboard side pieces 14 are then adhered to the opposite end portions of the abrasive segments 12 in such a manner that they form the sides of the wheel. The side pieces 14 are preferably formed of cardboad or other suitable material and are circular,

having an outer circumference which is slightly smaller than that of the circular core 10. The side pieces 14 also have circular open portions adjacent their centers.

The outer periphery of each of the side pieces 14 is securely adhered to the end portions of the abrasive segments 12, preferably with vinyl glue or other suitable adhesive material. The wheel which is so formed is capable of being easily handled and packed for shipping and replacement purposes.

In use, our wheel is preferably mounted between a pair of

metal side plates

15 and 16. The metal side plate 15 has a flange 17 which extends through the open center portions of the side pieces 14 and into a right angular shoulder 18 of the other side plate 16. The outer peripheries of the

side plates

15 and 16 are only slightly smaller in circumference than the core 10, so that they overlap the end portions of the abrasive segments 12 and the edges of the side pieces 14 and extend beyond the inner diameter of the core 10 in order to bind the abrasive segments1-2 against the sides of the core to prevent their separation from the core 10 during high speed rotational use of the wheel. 7

The side plates and 16 are provided with small centrally disposed circular openings 19 and20'for mounting the assembly on the mandrel or other mounting device which is in turn operated by a. suitable source of high speed rotation.

If twisted paper is used to form the circular core 10, it provides a certain amount of resiliency which is home ficial in the operation of the wheel.

In use, the entire outer periphery of the wheel presents a continuous somewhat resilient convex abrasive surface. As the, abrasive segments 12 become worn through use, portions offthe abrasive segments 12 therebeneath become exposed, so that fresh abrasive is always present and the life of the wheel is doubled. When the abrasive segments 12 are completely worn away, the wheel is usually replaced by separating the

mounting plates

15 and 16 and mounting a new wheel between them.

It' will be noted that the entire. area of the abrasive segments 12 is held closely adjacent to the periphery of the wheel so that no whipping or flapping action takes place. There is no play or loose area between the abrasive segments 12 and the core 10. The result is that our wheel prov-ides a very strong and positive cutting action.

We claim:

1. An abrasive wheel comprising a circular core formed of twist paper or the like, said core being substantially circular in cross section, a plurality of abrasive segments having abrasive material on the outer side thereof, said segments being substantially oblong in shape, said segments being disposed so that their longer sides extend transversely across said core, said segments extending around the entire periphery of said core, with each of said segments overlapping substantially half of the adjacent segment, a pair of circular cardboard side pieces, the diameter of said side pieces being slightlyless than the outer diameter of said core, the outer periphery of each of said side pieces overlying and being adhered to an end portion of each of said abrasive segments, said segments being held so that their midportions overlie and are held closely adjacent to said core with their ends disposed toward the center of said core.

2. The structure set forth in claim 1 and a pair of substantially rigid circular side plates disposed on opposite sides of said side plates being slightly greater than the inner circumference of said core and slightly less than the outer circumference of said core, so that said abrasive segments are disposed between the outer edges of said side plates and said core, and means for clamping said side plates together to prevent separation of said segments from said core during high speed rotational use of said wheel.

3. An abrasive wheel comprising a circular core, a

plurality of abrasive segments having abrasive material on the outer side thereof, said segments being substantially oblong in shape, said segments being disposed so that their longer sides extend transversely across said core, said segments extending around the entire periphery of said core, with each of said segments overlapping substantially half of the adjacent segment, a pair of circular cardboard side pieces, the outer periphery of each of said side pieces overlying and being adhered to an end portion of each of said abrasive segments, said segments being held so that their midportions overlie and are held closely adjacent to said core with their ends disposed toward the center of said core.

4. The structure set forth in claim 3, and a substantially circular side plate disposed on each side of said wheel, the outer edge of each of said side plates overlying the adjacent end portions of said abrasive segments, and means for clamping said side plates together to prevent separation of said segments from said wheel during high speed rotational use of said wheel.

5. An abrasive wheel comprising a circular core, a plurality of abrasive segments having abrasive material on the outer side thereof, said segments being disposed so that they extend transversely across said core around the entire periphery of said core, each of said segments overlapping substantially half of the adjacent segment, a pair of circular side. pieces, each of said side pieces being, slightly smaller in outer circumference than said core, the outer edges of said side pieces overlying and being adhered to the end portions of said segments on the, opposite sides of said wheel, said segments being thereby held so that their midportions overlie and are held closely adjacent to said core, with their ends disposed toward the center of said core.

6.. An abrasive wheel comprising a circular core, a plurality of abrasive segments having abrasive material on the outer side thereof, said segments being disposed so that they extend transversely across said core around the entire periphery of said core, a pair of circular side pieces, each of said side pieces being slightly smaller in outer circumference than said core, the outer edges of said side pieces overlying and being adhered to the end portions of said segments on the opposite sides of said wheel, said segments being thereby held so that each of their entire midportions closely overlies and substantially followsthe contour of the periphery of said core, the ends of said segments being disposed toward the center of said core.

7. The structure set forth in claim 6, and a pair of substantially circular side plates disposed on opposite sides of said wheel, the outer edges of said side plates overlying the adjacent end portions of said abrasive segments, and means for clamping said side plates together to prevent separation of said segments from said wheel during high speed rotational use of said wheel.

References Cited in the file of this patent UNITED STATES PATENTS 233,211 Crooker Oct. 12, 1880 837,556 Fryer Dec. 4, 1906 1,377,598 Paoli May 10, 1921 1,869,564 Johnston Aug. 2, 1932 2,447,748 Graham Aug. 24, 1948 n iw y