US56246A - Improvement in grinding-m ills - Google Patents

Description

No. 56,246. Patented July 10, 1866.

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Witnesses: v Inventor: v

UNITED STATES PATENT OFFICE,

JAMES W. MILES, OF HUBBARDSTON VILLAGE, MICHIGAN.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 56,2416, at d Ju y 1 1 llte July 1866- To all whom it may concern:

Be it known that 1, JAMES W. MILES, of the village of Hubbardston, North Plains township, in the county of Ionia and State of Michigan, have invented a new and useful Improvement in Millstone-Drivers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 represents the driver, in plan, upside down, the cover being detached. Fig. 2 is a cross-section in the line :11.

Similar letters indicate corresponding parts in both of the figures.

The object of my invention is to transmit the driving power from a mill-spindle to the runner in such manner as to better divide and equalize resistance at the driving points, and at the same time permit the freest possible vibration to the stone; and it consists in the employment of an annular casing in connection with elastic stops and jointed bars; and the better to enable others skilled in the art to construct and use my invention, I will now proceed more minutely to describe the same.

A represents a metal ring whose interior diameter corresponds with that of the eye of the stone. I usually make this ring of a rectangular form in cross-section; but it may be made of any suitable form, divided into as many channels or hollow compartments as will correspond with the required number of bearing-points. In each of these compartments a sliding block, B, proportionally shorter than such compartment, is loosely fitted, and the spaces between each end of said block and the contiguous abutments or partitions, as seen at a a, are occupied by'some sufficiently durable and elastic material, such as vulcanized sheet-rubber folded in corrugations, as exhibited at D, or, in place thereof, solid rubber may be advantageously used, or metal springs of any of the known suitable forms.

0 represents a metal sleeve fitted to the mill-spindle S, (shown as broken ofi below,) said sleeve being provided with keyways to match the splines c, with which the spindle is furnished. As this sleeve is lifted ofi from the spindle Whenever the stone is taken up, it must have a snug, yet free sliding fit.

M is a detachable cover, bolted at m to the ring-ears I.

The ring A is maintained concentric with the sleeve and spindle by the jointed drivingbars F, the outer ends of which pass through slots (not seen) in the inner wall of the ring and through slots in the sliding blocks B, to which they are jointed by pins 29, and the inner ends are jointed to elongated portions cof the sleeve by the pins 19 so as to bring the line of the driving-bars as nearly tangential with the ring as may be practicable and convenient.

H represents the bale, to which the ring A is firmly bolted through the ears I, said bail being secured in the eye of the runner and hung upon the cock-head J of the spindle in the usual manner.

I will say here that although I have described and illustrated my improved driver as operated by three driving-bars, which necessitates a three-pronged bail, yet in practice from two to'four bars may be used, and with a bail of the ordinary construction attached to the ring and stone at two opposite points.

When the several parts are connected to each other and to the stone, as herein described, and the stone properly hung and balanced upon its spindle, it will be seen that when the spindle is revolved the driving-bars F draw or push the sliding blocks B against the elastic abutments at D, and revolve the stone in such manner that its well-balanced equilibrium cannot be impaired when running, even if the spindle should not be in exact tram with the bed-stone, which it hardly ever is. This result is effected by the self-adjusted equalization of pressure due to the elastic bearings combined with the vertical play in the jointed driving-bars.

I am aware that some use rollers between rigid driving-bearings in order to prevent cramping the runner when the spindle was not in perfect tram, and that various devices have been employed to equalize the bearingpressure at opposite points; but all these contrivances have been only measurably successful, because the friction or adhesion was only partially removed, or the equilibrium of the meansof jointed driving-bars F, operating tanr stone only preserved at definite points and gentially against elastic bearings D, or their not (luring the Whole revolution and at all equivalents, substantially in the manner and points of the stone. for the purpose as herein described and set Having thus described my invention, what forth. I claim, and desire to secure by Letters Pat- JAMES W. MILES. a ent, is- Witnesses:

Transmitting motion from the driving-power GEORGE JOHNSON, through the mill-spindle to the runner by GEORGE F. MORRIS.

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