US43802A - Improvement in grinding-mills - Google Patents

Description

W." H. STAR-RY. Grinding Mill Patented Aug. 9;1864;

UNITED STATES PATENT OFFICE.

\VILLIAM l1. STARRY, OF FRANKLIN, OHIO.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 13,802, dated August 9, 1864; antedated February 28, 1864.

.T 0 aZZ whom it may concern.-

Be it known that I, WILLIAM H. STARRY, of Franklin, Warren county, Ohio, have invented anew and useful Device to Prevent Grinding-Mills Running Empty; and I do hereby declare the following to be a full, clear,

and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

My invention relates to an automatic provision to prevent the frequent destruction of the grinding-surfaces of niillstones and the burning up of mills, arising from the severe abrasion which takes place between said surfaces while running in the condition technically known as empty, or without grain between them.

Figure 1 is a perspective view of my improvement. Fig. 2 is a side elevation thereof. Figs. 3, 4, and 5 represent portions of the disengaging mechanism. Fig. 6 shows a modification of the ratchet-movement adapted for a steam-mill.

For convenience of illustration, the hopper A in the drawings is brought down to a level with the husk-floor B, but in practice will usually be the entire height of the husk and hoop above it. Hinged to an inner side of the hopper is a pedal or trigger, C, which, when the mill is full, or charged with grain, is held by the momentum of the descending grain to the horizontal position shown in black. A strap, I), extends from said trigger to the outer end of a weighted L- formed lever, E c. This lever, with its accessories, weighing a little less than the loaded trigger and a little more than the unloaded trigger, remains inactive while a full supply of grain is passing down the hopper, but the instant that the hopper runs empty falls by the excess of its weight over that of the unloaded tiigger, and acts to stop the mill, as will be presently explained.

'F is a sluice-gate, having a customary rack, G, pinion H, ratchet I, and pawl J. The gate may be elevated by a common spanner, K, fitting on the arbor L or otherwise, and will be held to its open position by the pawl J, as usual.

The automatic arrest of the grinding action is eii'ected by the above, in connection with the following mechanism.

M m is a lever, whose shorter limb, m, has a rod or finger, N, which, on the descent of the longer and heavier limb, M, presses under the pawl J, and thus, by releasing the ratchet I, permits the gate to close. The long limb of the lever M at has a link, 0, which traverses a vertical guide, I, in the frame, and in its upper position depends from a projection, Q. The counter-arm e of the lever E is so located relatively to the link 0 as to push the link off of the projection Q on the liberation and descent of the lever in consequence of the emptying of the hopper, as above explained. A slidable counter balance, R, on the lever E 0 enables the apparatus to be adjusted to operate with equal efliciency with light or heavy grain. In like manner, a counter-balance, R, on the lever M enables the momentum of the liberated lever to be adjusted for any weight of gate.

Sis astrap, by means of which the long arm of the lever M on may be. elevated so as to engage its link with the projection Q.

Fig. 6 represents a steam-throttle adapted to operate on my plan, corresponding parts being indicated by like letters.

My method is equally applicable in other forms of uiillsthus it may be made to opera e a slip-belt, or a clutch, or to unship a sliding pinion upon the spindle through the medium of the common yoke and lover. I have, however, preferred to select for illustration a form successfully usedby me, and by which I am enabled to remove a casualty well known to be the most destructive of any to the burrs and a frequent cause ot'contlagration.

My devicc,being self-acting and certain, supersedes the perpetual vigilance on the part of the miller now necessary.

I claim hereinas new and of my invention- The mode, substantially as described, of

automatically arresting the motion of a grindingmill, when running empty, by means of the disengaging mechanism 0 D E e M m N Q, or devices substantially equivalent.

In testimony of which invention I hereunto set my hand.

VILLIAM II. STARRY.

Witnesses:

GEO. H.1(1vrcnrr, CHARLES L. FISHER.

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