US85444A - Improved griwding-milii - Google Patents

Description

v.9. Sheets-Sheet 2.

E. HARRISON.

l Grinding Mill.

Patented Dec. 29;*1868.

MPETERS, PHOYQMTHDGRAPNER WASH NGwN u c ginnt, @anni Msaaeeww @time Meo b EDWARD HA RRISON, OF NEW HAVEN, CONNECTICUT.'

Leners Patent No. 85,444, dated December 29, 1868.

IMPRO'VED GBINDING-MLL.

To all .whom it ma/y concern Be it known that I, EDWARD HARRISON, of New Haven, in the county of New Haven, and State of Connecticut, have invented anew Improvement in Grinding-Mills and I do hereby declare the following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said dlawings'constitute part of this specification, and represent, in I Figure l, a side view;

Figure 2, a front view;

Figure 3, a longitudinal'central section;

Figure 4, a vertical section between the two stones; and in Figures 5, 6, and 7, modifications of my invention.

rlhis invention relates to an'improvement in mills for grinding grain, specially designed for the manufacture of flour, the object being to combine with the millcasing the bolt, so that the our and the hulls may be discharged separately from the same mill; and

The invention consists in the arrangement of a boltcloth, or screen, around the stones, so that the meal, in passing from the stones, is thrown against the boltcloth, the ne or flour-portion passing through the cloth to one exit, while the coarse or hull-portion is driven out at another exit, separating the one entirely from the other.

To enable others to construct and'use my improvement, I will fully describe the same, as illustrated in the accompanying drawings.

A is the casing lof the mill, constructedin any convenient form, centrally through which passes a shaft, B, supported in a bearing,- O, and in an adjustable step, D, and caused to revolve by the application of power thereto through the pulley E,

On the said4 shaft is fixeda plate, F, with a hub, G, so as to receive and carry the runner-stone-H, and in a positionlcorresponding to the runner-stoneH, .the bede stone I is arrangedwithin the case, as seen in iig. 3.

Within the case, between the stones and case, and

' surrounding the stones, I place a cylinder, K, of boltcloth, as seen in figs. 3 and 4, supported in the case so that the runner-stone will revolve freely within the -Xed bolt-cloth, as seen in iig. 3, the boltfcloth secured to a fixed plate, L, upon one side, and by a ring, a, upon the other edge, and these secured by bolts, d.

To the edge of the runner-stone casing, or plate F, are'xed sweeps, c, more or less in number, (by preference, two,) which, as the runner-stone revolves, sweep around between the bed-stone and bolt-cloth; and to the shaft, I ix other sweeps, b, as seen in gs. 3 and 4, so as to revolve in the space between the bolt-cloth and the inner surface of the casing, in close proximity to the bolt-cloth.

M is the outlet from the casing outside the bolt-cloth. (See g. 4.)

N is the outlet between the bolt-cloth and the stone, as seen in fig. 2. i V

, P is the hopper, into which the grain is placed, opening through the bedfstone I, as seen in g. 3.

At the said opening is arranged a worm, R, fixed to.

tween the stones, as fast as ground, and, by the centrifugal force of the revolving stone, the meal is thrown against the bolt-cloth, and the sweeps c serve to keep the m'eal in agitation between the boltcloth and the stones, and this, by the rapid revolution of the stones, forces the finer portion or flour through the bolt-cloth, which is brushed or swept from the bolt-cloth by other sweeps, b, and by the said sweeps -b the flour is forced out through the opening M, while the coarser portion, which cannot pass through the bolt-cloth, is forced, by the sweep c, out through the opening N between the bolt-clothand the stones.

The sweeps are inclined, upon their advancing edge, towards the outlet N, which facilitates the passage of the coarser portion, to that side of the mill, and, .consequently, out from themilh The casing of the mill, the driving and adjustment of the stones, are such as are in use, and have been long manufactured and known to the trade as the Hare rison mill.

The position of the outlets M and N may be varied,

as it is not essential at which point around the'mill they are placed. i

Itis often desirable, in grinding wheat, to produce two qualities or grades of flour, which is accomplished by the use of two bolt-cloths, of different meshes.

In iig. 5, I illustrate my arrangement for producing two grades of flour. Y

The different parts of the mill are represented by the same letters, but, in addition to the bolt-cloth K, I place between that and the case, a second boltcloth,S, also' making an additional outlet, T, between the two boltclothsthe outer cloth S being of' aner mesh than the inner; and I also arrange an additional sweep, jf'between the two cloths. l v g By this arrangement, that portion of our which will pass the rst bolt-cloth, enters the space between the two bolt-cloths, and is there separated, the finer portion passing through the cloth S, while the coarser portion passes through the outlet T. f

Other bolt-cloths, forfurther grading of the flour, may be added in like manner.

In g. 6, I showa diiferent modication for producing different grades of flour.

I employ, as inthe first instance, asingle bolt-cloth,

but of two different meshes, 'm and n, n being the finer,l

and I form a ring or partition, l, around the space between the bolt-cloth and casing, so that the portion of flour which passes through one boltcloth, cannot enter into the chamber where the i'our from the other chamber passes, and I form a separate outlet, M and T, for the separate spaces therefore, only the finest portion of the our will pass through the part n, while the coarser will pass out through the part an of the bolt-cloth, and each quality through its respective outlet, the bran pass- .ing out separated, as before.

I have ,thus far represented the holtlcloths as arranged entirely around the stones, and have also represented the sweeps as being fixed within the case to the shaft. It will, however, be readily seen that the holt-cloth need not extend entirely around, as a portion of the cylindermay be of solid material, the flour only passing out of the perforated or cloth-portion of the cylinder; and it will also be readily seen that the sweeps may be detached from and driven independent of the shaft, by arranging a plate, rin g, or wheel, Within the case, with projecting arms, to act as sweeps, and communicating power to the said plate from outside the cylinder. 4

In fig. 7, I show a still different modification or arrangement of the bolt-cloth. In this, the bolt-cloth K is simply placed over the outlet from the casing. This arrangement serves a good purpose when it is not deslrable to entirely separate the flour from the hulls,

In this construction, the grain, when ground, is thrown against the clothv K, the nest portion of which will pass through, and escape at the outlet M, while the coarscr portion will escape atanother outlet, with the hulls or gran, thus,'in the 4same mill, producing both meal 'and our.

I have thussucceeded in producing a mill of very .little enlarged dimensions, which combines within itself both a grinding and holting-apnaratus--an advantage oi'er other mills and bolting-apparatus, which is too apparent to require that more be said in explanation.

I do not claim the arrangement of a bolt-cloth upon the stones of a grinding-mill, as such, I am, aware, is not new.

Having thus fully described my invention,

What I claim as new and useful, and desire to secure by Letters Patent, is-T A The arrangement, with the casing which encloses the stones, of one or more bolt-cloths, so as to separate the liner from the coarser portion of meal within the casing of the mill, substantially as set forth.

EDWARD HARRISON.

Witnesses: Y

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

Images