US2468241A - Means for forming the surface of grinding wheel - Google Patents

Description

A ril 26, 1949. A, NER 2,468,241

MEANS FOR FORMING THE SURFACE OF GRINDING WHEELS Filed Oct. 26, 1945 Patented Apr. 26, 1949 UNITED STATES PATENT OFFICE MEANS FOR FORLIING THE SURFACE OF GRINDING WHEEL 3 Claims.

This invention has reference to an improved means of forming the surface of a grinding wheel, and is particularly identified with the type of hardened steel rotary former usually employed to effect through pressure a surfacing of the grinding wheel by impressing by embedment therein serrations which form the ultimate surface of the grinding wheel.

Existing means of surfacing grinding wheels generally involve a gap in the periphery of the former wheel with a consequent periodic discontinuity or variation in the rotational speed btaining between the two contacting wheels with the result that at the moment of starting up and intermittently thereafter it is necessary to overcome an initial inertia which tends to produce damage due to drag on the peripheral surface of the former.

The invention consists of a means of forming the surface of a grinding wheel, characterised by the former being associated with a resilient annulus or track adapted to maintain contact with the surface of the grinding wheel to ensure and maintain a continuity of speed throughout the forming operation.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended drawings upon which:

Figure 1 illustrates in vertical sectional elevation a former having a resilient annulus or track in accordance with the present invention, and

Figure 2 is a transverse sectional elevation taken on line 2-2 of Figure 1.

Broadly describing one means of carrying the present invention into practice, the former wheel a. is produced from hardened steel and has very fine serrations or cutting teeth a on its periphery which effect by pressure the formation to the surfacing of the grinding wheel; this former wheel a is provided at say the one side with a driving member, for example a resilient annulus b of slightly larger diameter than the diameter of the former wheel a and the periphery of this resilient annulus is maintained in contact with part of the periphery of the grinding Wheel and thus provides a continuous resilient or flexible peripheral frictional contact drive between the former wheel a having the gap a and the grinding wheel throughout the whole period of rotation and operation The driving member may be a wheel or a disc or other similarly shaped member having a circular periphery for example, as shown, it may be a resilient annulus b which may be produced from asbestos or fibre, cork, india rubber, or may comprise a plurality of spring-loaded segments which peripherally form the annulus or ring which is maintained in driving abutment with part of the periphery of the grinding wheel. As illus- 5 Number trated the resilient annulus b is mounted upon a steel spacing ring 11 and both annulus and ring are held in position by threaded annuli c, d as shown.

In common with other wheel forming devices the forming wheel and resilient driving means are rotatably mounted on a shaft e which is supported in the bifurcated ends of a handle 1.

It will be obvious that various modifications may be effected in the particular construction and arrangement of the driving member comprising the annulus b and that when the surface forming operation is in progress the outer section or periphery of the resilient or flexible annulus b is deformed or distorted and thus at the line of contact between the former wheel and the grinding wheel the periphery of the resilient driving member is forced back to admit of the desired degree of pressure crushing contact between the two rotating wheels, thus the wheels maintain a continuity of rotational speed throughout the surface forming operation upon the periphery of the grinding wheel and avoid the possibility of any variations of rotational speed arising which are known to obtain in existing methods of surfacing grinding operations of the kind referred to.

I claim:

1. A grinding wheel surface forming device comprising, in combination, a toothed surface rotatable former, and a driving member comprising a resilient circular member having a periphery extending beyond the peripheral limits of the teeth on said former and secured to and rotatable with said former, said driving member being engageable with the periphery of the wheel being ground.

2. A device for surfacing grinding wheels, comprising, in combination, a handle, a toothed forming wheel rotatably mounted in said handle and a resilient driving annulus attached to said forming wheel and engageable with the periphery of the grinding wheel to be surfaced.

3. Means for driving a rotatably mounted, toothed forming wheel for surfacing grinding Wheels, comprising a resilient circular member attached to one side of said forming wheel and having an outside diameter greater than the outside diameter of the teeth of said forming wheel for driving engagement with the periphery of the grinding wheel to be surfaced.

ARTHUR SCRIVENER.

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

FOREIGN PATENTS Country Date 417,771 Great Britain Oct. 11, 1934

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