US1130163A - Superimposed emery-wheel and grindstone. - Google Patents

Description

D. HALL. SUPEBIMPOSED EMERY WHEEL AND GRINDSTONE.

APPLICATION FILED MAR.7, 1913.

Patented Mar. 2, 1915.

INVENTOR A TTORNE Y THE NORRIS PETERS CO.. PHOTG-LITHO.. WASHINGTON. u. C.

DAVID HALL, OF WILKINSBURG, PENNSYLVANIA.

SUPERIMPOSED EMERY-WHEEL AND GRINDSTONE.

Application filed March 7, 1913.

cavities of cut and using the larger stone as a fly wheel for the smaller stone. Tool rests 20 and 21 are shown.

Further purposes of my invention will appear in the specification and claim hereof.

I have preferred to illustrate my invention by one form thereof which is practical, inexpensixe and eiiicient and which at the same time well illustrates the principles of my invention.

Figure 1 is a side elevation of the preferred form of my invention. Fig. 2 is a rear elevation of the structure seen in Fig. 1.

Similar numerals of reference indicate like parts in the figures of the drawing.

1 represents uprights or supports forming part of a frame having top bars 2 braced to the uprights, as at 3, and supporting a pillow or other suitable bearing 4, within which the shaft 5 is rotated by arms 6, 7, through rods 8 and treadles 9, pivoted at 10.

The shaft 5 carries the main stone 11, preferably a grind stone, to which I attach a pulley wheel 12, as by studs 18. A much smaller stone 14;, preferably of emery or .carborundum is mounted above the main stone upon a shaft 15 parallel to the shaft 5 and is supported by arms 16 at a convenient distance from the seat 17 occupied by the workman. For convenience in reference and claiming, I shall hereafter use emery as a general term to refer to materials of like general character, whether natural or artificial. I drive the auxiliary stone 1 1 from the pulley upon the main stone, and a much smaller pulley 18, upon the shaft 15, using any desired belt or chain drive, here represented by a rope 19. I

Specification of Letters Patent.

Patented Mar. 2, 1915.

Serial No. 752,541.

prefer to place the center of the smaller stone directly above the center of the larger one, though its position about the axis of the lower stone, whether nearer to or farther from the seat for the operator will not ordinarily be material.

I intend the upper stone for rougher grinding and operate it at a niuch higher speed than the speed of the lower stone, even ten times the speed being desirable for some uses with a small auxiliary, the speed desirable varying with the size but always much greater than that of the main stone, in order that I may effect the above purpose and at the same time give a greater concavity to the tools or other parts thus rough ground, so that the rake or clearance of machine tools, etc., may be given to advantage during the rough grinding and the larger and finer stone need be used for the finish only.

he direct connection which I have shown between the two stones enables me to obtain to the fullest degree a balance wheel effect of the lower stone upon the upper stone, so that with a small upper stone I am able to get regular and forcible rotation from treadle operation.

It will be evident that the characters as well as the sizes of the stones, may be modified to suit the needs of different workmen, provided there be a considerable difierence in their sizes and the character of their cutting faces.

It will be evident that reference to belt connection herein may properly include such connection, whether by link, chain or other belting. It is evident that tool rests may be removable or adjustable, as desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

In a device of the character stated, a pair of abrasive stones of different surface characters having substantially parallel aXes and one much larger than the other and adapted to act as a fly wheel for the other, operative connection between the stones, supports for the stones and means for driving the larger stone.

DAVID HALL. Vvitnesses:

F. G. MONROE, R. F. MCKINNEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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