US122605A - Improvement in grist-mills - Google Patents

Description

EDWARD HAHRiSON.

Improvement in'Grst MHs'.

Patented Jan. 9, 1872.

EDWARD YHARRIsON, or New RAVEN, CONNECTICUT.

IMPROVEMENT IN GRIST'MILLS.

Specification forming part of Letters Patent No. 122,605, dated January 9, 1872.

' To all whom it may concern:

Be it known that I, EDWARD HARRISON, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Grist-Mills; and I do hereby declare the following, when taken in connection with the accompanying drawing and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes part of this specification and represents, in-

Figure 1, a side view; Fig. 2, a longitudinal central section, and in Fig. 3 a'transverse section.

This invention relates to an improvement in combined grinding and bolt-mills, the object being to combine with the mill a revolving bolt, and so that the stones will discharge into the bolt around their circumference-that is to say, so that the runner-stone shall revolve directly within the bolt; and the invention consists chieiiy in so combining the bed and runner-stone of a grist-mill with a revolving bolt that the runner-stone will revolve directly within the bolt, as more fully hereinafter set forth.

A is the bolt-case, to one head, B, of which the mill is attached. C is the bed-stone case, within which the bed-stone D is arranged in the usual manner for the mill known as the Harrison mill, and embodying the improvements in the mill for which I filed an application for patent on or about November 29, 1871. E is the driving-shaft or mill-spindle, supported in a bearing, F, ruiming through into the runner-stone, driven by a pulley, G, in substantially the manner as in the mill before referred to. Upon the shaft E the runner-case H is iixed, and so as to revolve therewith. Centrally in the runner-case I form a sleeve, l, fitting closely the bearing F ofthe shaft E, so as to form a compound bearing for the runnerstone, or a bearing in addition to F formed on the bed-stone case. Lis the feed-spout; M the hopper, applied and Operating as in the mill before `referred to. In this construction the runner-stone is adjusted by a nut, a, on the bed-stone case, which bears against the pulley, and by the turning of this nut-the pulley being xed to the shaft-the runner-stone may be drawn closer to the bed-stone or permitted to run further from it. A second head, N, similar to the head B, is arranged distant from the head B the length required for the bolt, and between the two heads is tted with a case, A, with a longitudinal openin g, P. Vithin this case the bolt is arranged, consisting of two rings, d e, of angular form, as seen in transverse section, Fig. 2, so that the one,

takes a bearing withina flange, f, within the head B, the other, e, within a similar flange, g, within the head N. These rings are joined together by longitudinal bars B, which, by preference, are made of wood, on account of its weight. The bolt is made to revolve by means of an internal gear, h, on the ring 0l through a pinion, S, in the shaft T, driven by a pulley, U, to give the bolt the necessary velocity. The bolt outside the bars B is covered with bolt-cloth, as denoted by broken lines in Figs. 2 and 3, a little less in diameter than the shell, and outside these bars, over the bolt-cloth, sweeps or bars W are applied so as to run in close proximity to the shell; hence when the mill is set in motion, and the bolt with it--the bolt by preference being driven directly from the mill-shaft-the meal is driven with great force against the bolt-cloth and thefinest portion will pass directly through the bolt-cloth into the space between it and the shell. Other portions, the bolt being inclined, naturally tend to work from the stones toward the other end of the bolt, and different grades or neness of meal pass through the bolt at different sections, leaving only the bran at the eXtreme end within the mill. The bars B carry up the meal until it falls therefrom back onto the bolt-cloth to facilitate the sifting. The flour which passes through the boltcloth is taken by the sweeps W and carried up to the opening P and there discharged, provision being made for the different grades. The bran which is still within the bolt is continually carried up by the bars B until it reaches the extreme end and is there discharged inside the bolt bythe bars B into the dischargespout Y, thence passing out` through the conductor Z, the said vspout being denoted in broken lines, Fig.` 3. By preference I make the head N removable, so that by taking it from the case the hopper may be drawn directly out, if for any purpose this should be FFICR.'

required. By applying power to drive the bolt to one of the rings of the bolt I avoid the central shaft, which is usually employed, and the necessary arms or spokes to connect the shaft to the rings or heads. To strengthen the bolt to prevent this manner of driving from twisting the bolt I extend from one bar to the next, and so on around the bolt, brace-rods n, (see Fig. 2,) forming, as it were, a truss for the internal support of the bolt.

I claim as my invention- I. The arrangement of the bed and runnerstone of a grist-mill within a revolving bolt, substantially as described, so that the runnerstone discharges the meal around its periphery directly into the bolt.

2. In combination with the bearing F, formed upon the bed-stone case C of the mill, I claim the sleeve I formed on the runner-stone case surrounding said bearing` F, through which the shaft E passes to the runner-stone case, substantially as set forth.

3. In combination with the mill and revolvingbolt, constructed substantially as described, 1 claim the gear h on one head of the boit and the pinion S Working in the said gear to cause the said bolt to revolve, substantially as specied.

4. In a bolt, consisting ofthe heads e h, bars R, bolt-cloth and case A, I claim the sWeepsW Within the case to carry the ilour to the dischargespout P, in the manner and for the purpose substantially as set forth.

5. In combination With the subject-matter of the fourth clause of claims, I claim the diag onal braces n within the bolt, as and for the purpose specified..

6. In combination with the subject-matter of the fourth clause of claims, I claim the internal discharge Y Z, as and for the purpose set forth.

EDWARD HARRISON.

Witnesses A. J TIBBI'rs, J. H. SHUMWAY.

Images