US176527A - Improvement in grinding-mills - Google Patents

Description

UNITED STATES PATENT GEEICE.

CHARLES A. HARPER, OF BURLINGTON, NEW JERSEY.

IMPROVEMENT IN GRlNDlNG-MILLS.

Specification forming part of Letters Patent No. l76,527, dated April 25, 1876; application filed July 31, 1875.

To all lwhom it may concern Be it known that I, UHARLEs A. HARPER, of Burlington, in the county of Burlington and State of New Jersey, have invented a new and useful Improvement on Grinding- Mills, of which the following is a specification This invention relates especially to improvements Ina-de on my Hour-mill patented on the 4th day of March, A. D. 1873, No.136,508.

In the annexed drawings, making part of this specification, Figure 1 is a vertical 1ongitudinal section. Fig. 2 is a'horizontal section. Fig. 3 is a transversel section of the hopper. t

The same letters are employed in all the figures in the designation of identical parts.

The mill is inclosed in a tight case, A, having on top of ita hopper, B, from4 which the grain is fed to the mill. In order -to give a more perfect adjustment to the feed two Acurved plates, B1 B2, are secured to the ends of the hopper by set-nuts and slots, sothat they may be independently adjusted.

C is a short axle, having both ends supported in bearings, and its inner end bearing against a plate, D, adjusted and held by them by nut D". It is driven'by a crank or pulley, and has upon its outer end a spurwheel, communicating motion to the ily-wheel shaft.

The mill consists of the concave bed E, rigidly secured to the casing, and a runner, F, convex on its face to fit the concavity ot' the bed. rIhe grain is ground when fed from Y the hopper into the space between the bed and runner. In order to relieve the surfaces from friction the runner F is loosely attached on the shaft., not being keyed to it, but secured by a pin,F/, which allows it to oscillate on the shaft, and thus permits small stones or other hard substances to pass through the mill without breaking it. The space between the bed and runner may be regulated by loosening or tightening the thumb-nuts D.

The shaft Gr carries a y-wheel, H, formed by arms and adjustable weights, and has on one side a projection for giving motion to the shaking screen I, which swings on straps I I', a pin, K, on the shaker encountering the projection G. A spring (not shown) brings back the shaker. The line Hour falls from the shaker into a drawer, L, while the oft'al passes over the end of the screenY and falls upon a slide, M, conducting it into a lower drawer or other receptacle.

As the piu F engages a recess in the back of the runner it will cause the latter to revolve with the shaft; at the same time ythe shaft, havlng bearings at both ends, may be moved longitudinally by the adjustable plate D and thumb-nuts D', to regulate the space between the surfaces for high or low grinding.

The adjustable weights H H may be set nearer to or farther from the center, so as to regulate the momentum of the ily-wheel according to the feed and character of grain passing through the mill.

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

1. The combination, with the bed E, of the runner F, swung loosely on a. longitudinallyadjustable shaft, having bearings at both ends, and carried by the pin F', engaging a groove in the back of the runner, substantially as sct forth.

2. In combination with the mill E F and hopperB, the independentlyadj ustable curved plates B1 B2, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

C. A. HARPER.Y Witnesses: v

LEMUEL C. REEVES, HOWARD D. LE ROY.

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