US97134A - Improvement in balancing millstones - Google Patents

Description

G. S. THOMPSON. Balancing Millstones.

- Patented 'Nov. 23, 1869.

N. Ptrilm Prwbumo mr. Wnhingtnn. n c

waited Estates g am attire Letters Patent No. 97,134, dated November 23, 1869.

IMPROVEMENT IN BALANCING MILL STONES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, GEORGE S. THOMPSON, of the ;e.ity and county of Philadelphia, and State of Penn- ;sylvania, have made certain Improvements in Mills for Grinding Grain, MineralSubstances, &c.; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying sheet of drawings, and to the letters of reference marked'thereon.

My invention consists in adjusting the upper stone of a mill, in which the lower stone is the runner, by the use and application of upper and lower adj ustingscrews, in connection with adjustable nuts, having dovetailed tenons which take into corresponding mortises in the housings of the same, whereby the upward pressure of the upper stone is prevented from spreading and cracking the housings.

\ On reference to the accoinpan yin g sheet of d rawin gs, making part of this specification Figure 1 is a perspective view, and

Figure 2 is an elevation of the housing.

Similar letters refer to similar parts in the several views.

A great drawback in mills for grinding, and which in a great measure affects their etiicieucy, is the difliculty experienced in adjusting the stones at the proper distance apart, and balancing them to run perfectly true and even. I accomplish the operation of levelling and adjusting or setting the stones at the requireddistance apart, by means of levelling adjustingscre-ws,-as follows: (As before stated, the lower stone is the runner, the upper one being fixed.)

A B are the upperandlower stones of a mill. The lower one turns with aspindlc, as usual; the upper one has a horn-band, O, shrunk on it.

This band has a suitable number, four being shown in this instance, of horns I), projecting from it, forearrying the stone.

These horns take into the slots E, of the housings F, on the table G-of the mill, and are carried on the ends of the upwardly-projecting screws H, which take through correspondingly-tappcd openings in the crosspieces a of the housing. The ends of the downwardlyprojecting screws K bear on the upper sides of the horns, and are prevented from lifting by means of the nuts L in the slots E. The points ofthe horns, where the upper and lower screws bear, are recessed to stiffen the ends of the same.

To level and adjust theupper stone A, the top or downwardly-projecting screws K are hacked or unscrewed, and the lower screws H either raised or lowered by turning in the cross-pieces a, until the stone 7 is perfectly true and level, and set at the required distance from the runner-stone B. The jain-nutsM on the same screws are then screwed against the crosspiece a, to keep them from unscrewing, after which the upper screws K are screwed firmly on the top of the horns, to keep the upper stone from liftin".

The upward pressure of the stationary stone A is very great, and varies with the grain or other article to be ground, the tendency of which, acting on the nuts L, through the horns D and the screws K, is to spread the sides or guides l) of the housings, when the flanges or projections of the nut are level, and bear squarely against the ledges or projections c at the top of the guides, to prevent which, and make thehousingscapable of sustaining any upward pressure commensurate with the size of the mill, 1 construct the nut L with dovetailed tenons d, which take into corresponding mortises e in the housings, so that when the pressure of the stone is brought upon the nut, the tenons will be forced firmly into the mortises, thereby keeping the sides or guides l) from-spreading apart and cracking at their intersection with the cross-piece a.

I am aware that mills have been constructed with one levelling and adjusting-screw foreach horn, as shown in the patents ot'J. Straub, May 28, 1867, and H. I Straub, March 20,1866; anda rolling-mill, having a pressure screw-nut with projecting flanges, is exhibited in the patent of Josiah Holmes, July 18, 1865, thertenon-and-mortise device not being shown.

My invention is designed to tram or level and adjust the stones of a mill, and, atthe same time, to correct the effect of the upward pressure of the upper stone.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

The horns D, the upper and lower upwardly and downwardly-projecting screws H K, the nuts L, with their tenons d, and the housings F, with their mortises e, substantially as shown and described.

In testimonywhereofil hereunto sign my name to this specification, in presence of two subscribing wit- IIOSSGS.

GEORGE S. THOMPSON.

Witnesses:

FRANCIS D. PASTORIUS, J on: H. LIBBON.

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