US927145A - Safety-collar for abrasive wheels. - Google Patents

Description

D. B. HYDE.

SAFETY COLLAR FQB ABBASLVE WHEELS.

APPLICATION FILED 11121, 1907.

Patented July 6, 1909.

A X i MI. I. awn cm WM- mm"! a a UNITED STATES PATENT OFFICE.

DAVID B. HYDE, OF SANTA ANA, CALIFORNIA.

SAFETY-COLLAR FOR ABBASIVE WHEELS.

To all whom it may concern:

Be it known that I, DAVID B. Hrnn, a citizen of the United States, residing at Santa Ana, in the county of Orange, State of California, have invented a new and useful Safety-Collar for Abrasive heels, of which the following is a specification.

This invention relates to collars to be used for emery wheels, polishing wheels, or other abrasive wheels, and the main object of the invention is to prevent accidents to workmen by flying pieces of emery or other material of which the wheel is composed. This object is secured first, by providing means which, far as possible, safeguards or prevents the wheel from breaking, and second, by providing means, which in case of breakage,

holds the pieces of the wheel from dying out.

In the manufacturing of emery or other abrasive grinding wheels, the sides of the wheel have to be smoothed or turned after coming from the kilns or molds. The material of which the wheel is composed and the cements of varying hardness that have to be used for wheels of different classes, render it very expensive and almost an impossibility to turn up the sides of the wheel so that they are always true to each other. Moreover, the least variation in the bushings of the wheels is liable to throw the sides out of line. In the use of safety collars on wheels with one or both sides turned convex, many wheels have been broken or strained from the unequal pressure of the side safety collars. This invention provides for safeguarding against such breakage or straining by means of a pressure ring of rubber or other flexible material, the surface of which bears against the sides of the wheel so that the wheel will revolve in unison with the spindle or arbor upon which it is mounted, while at the same time the lateral strain or pressure on the sides of the wheel is equalized, compensating for inequalities of surface, and in combination with such equalizing pressure means I provide teeth or serrations surrounding said flexible material, said teeth or serrations only coming in contact with the sides of the wheel in case of the accidental breakage of said wheel.

In the accompanying drawings :Figure 1 is an. axial section of a grinding wheel provided with my improved collars. Fig. 2 is an inner face elevation of one of the collars.

1 designates an abrasive wheel, which may be an emery or other abrasive wheel, grind- Specification of Letters Patent.

Application filed January 21, 1907.

Patented July 6, 1909.

Serial No. 353,395.

ing, or polishing wheel. Said wheel has the usual central hole 2 for the reception of the arbor or spindle 3.

A collar 4t is placed at each side of the wheel, said collar being formed to fit more or less, the side of the wheel being concave or dished in case of a convex sided wheel, as shown. These collars have central holes 5 to receive the arbor 3 and are held in place by fast collar 6 on the spindle, loose collar 7, and nut 8.

The inner face of each collar is grooved or recessed annularly as shown at 10, and also provided with inwardly projecting guard teeth or serrations 11. The projections are preferably located immediately adjacent to the outer wall. of each recess and thereby increase the height of said all to the extent of the height of the serrations. The distance between the serrations on the opposing collars is normally less than the maximum thickness of the wheel 1, so that of can not move radially from between the collars without being caught'by said serrations. A pad or ring of elastic material, as rubber, is seated in each groove with its inner face normally projecting inward beyond said serrations so as to engage with the sides of the wheel 1 when the collars are forced inward, and hold the wheel in position independently of the serrations.

So long as the wheel remains intact the pressure upon the cushions 10 is not sufficient to compress them so as to permit of the engagement of the serrations with the sides of the wheel, but if the wheel should break the pieces would immediately be thrown outward which would cause the thicker portion of the fragments nearer the hub to be wedged in bet-ween the opposing cushions and compress them to such an ex tent that the unyielding serrations would engage with said fragments and stop their outward movement. As this movement of the fragments is radial there would be a tendency for their inclined walls to push the pads or elastic bands outward which would have a tendency to unseat them, or cause them to roll over onto the serrations, and thereby prevent the sharp edges of the serrations from engaging with the sides of the fragments and holding them fast. This outward movement of the bands is stopped, or retarded, by the higher outer wall of each recess formed by locating the serraon breaking of the wheel the portions there.

tions immediately adjacent thereto and causing them to project inward as heretofore stated.

In operation, the wheel is clamped between the collars, the yielding or cushion members 9 engaging with the collar faces and clamping the same tightly and yet yieldingly, so that any slight deviations of the wheel surface from uniformity will not cause strain or bending by the pressure of the collars, and pressure will not be concentrated at a few highpoints but will be distributed uniformly over considerable space, covered by the members 9. I thus obviate the most serious cause of breakage, namely, unequally distributed pressure on the wheel by the collars.

What I claim is In a grinding and polishing wheel, the combination with a convex sided wheel, of a pair of clamping collars upon opposite sides thereof, the inner face of each collar being concaved and recessed annularly and provided with inwardly projecting serrations immediately adjacent to the outer wall of each recess, the distance between said serrations being normally less than the maximum thickness of the convex sided wheel, and an annular pad of elastic material in each recess, the inner face of which projects inward beyond said serrations and normally holds the wheel out of engagement with said serrations, said elastic material being adapted to be compressed by the outward movement of the thicker portions of the wheel until said thicker portions engage with and are held against further outward movement by said serrations.

In testimony whereof, I have hereunto set my hand at Los Angeles California this 10th day of January 1907.

DAVID B. HYDE.

In presence of- ARTHUR P. KNIGHT, FRANK L. A. GRAHAM.

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