US101917A - Charles henry roberts - Google Patents

Description

O.H.ROBERT& Grinding Mill.

Patented April 12. 1870.

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CHARLES HENRY-ROBERTS." or EVANSVILLE, INDIANA.

Letters PatcntNo. 10 1,917, dated April 12, 1870.

1, CHARLES HENRY ROBERTg-of Evansville, county of Vanderburg, State of Indiana, have invented an ImprovedGrinding-Mill, of which the following is a specification. Nata-re and Oly'cctof the In'rcntwn.

My' invention consists of a gninding-niill having a cylindrical bur revolving in fixed bearings, anda concave grinding-surface rendered adjustable with the case which cont-ains'the bur, in amanncr which will be fully described hereafter; and

My invention also consists in the combination of the said adjustable case,'and a concave consisting-of a'nu'mher of plates or disks having serrated edges, with irrtervening plates having plain edges, as hereafter explained. l

Description of the Accompanying Drawing,

Figure 1 is a side elevation of my improved grinding-mill Figure 2, a vertical section of the same;

Figure 3, a sectional plan .view on the line 1 2, fig.

1; and v 3 Figure 4, a transverse section of part .of the will on the line 3 4, fig. 1.

General Description. A represents a wooden beam or other stationary object, to which a frame or plate, B, is secured by bolts,

a,-but it should be understood-that this frame can be so modified in form as to be entirely self-supporting.

The frame B has two arms or brackets, I) and b, at are formed bearings, c c, for the journals of a horizontal shalt, D, which carries a driving-pulley, F, and the cylindrical bur G of themill.

The bur is of the peculiar construction best observed .in fig. 3, as it consists of a number of thin serrated disks or plates, d, of steel, resembling circular saw blades, which are adjusted upon the shaft alternately with thin disks or plates, at, of sheet-iron, tin, orother suitable material, these disks being of a somewhat less diameter than those with serrated edges.

The whole oftlie platesforming the bur are confined between a collar, e, of the shaft 1), and a washer,

j,- whieh is forced against the said plates by a nut, g, adapted to the threaded portion 9 of the shaft.

I have found that burs constructed in the above manner are most effective in practice, as the teeth of the several plates form a continuous dress,, which can be readily sharpened when necessary, orwvhieh can be quickly repaired by the removing and replacing of any of the plates when the teeth become broken.

The cylindrical bur (J is contained within a cast-iron shell or case H, which consists of side-plates l: h, a

'veitical'guides on the frameB;

top plate, 13, "bottom plate i, and vertical end-piece j,

the whole being secured together by suitable bolts, 16.

A hopper, l, of appropriate capacity, is secured to the top of the case B, and the opening at the bottom of't-he said hopper is arranged to be wholly or partially closed by a sliding gate, in. I

The concave griudingrsurfi'tee I of the mill is constructed in precisely the same manner as thecylindri cal bur G, that is, of a number of plain and serrated plates arranged alternately. It is permanently secured within the case H by bolts 7c, rests against the end piece j of the saidcase, and is so arranged in respect to the cylindrical bur G that the space between it and the latter shall gradually decrease in width toward the bottom. I

' The case B so attached to the frame-B that it can, together with the concave, be adjusted vertically,

while the shaft 1) and cylindrical bar, which are carried by the frame B, remain stationary. The. concave can thus be adjusted toward or from the cylindrical bur.

The niethod of connecting and of adjusting thcsaid case is, in the present instance, as follows:

The frame Bhas at the top two vertically-slotted lugs, 11 p, and at the bottom a vertical slot, 1), and to these slots are adapted the bolts q and q of the case, furnished with suitable nuts, which, after a vertical adjustment of the case, can be tightened, sons to retain the. latter in any desired position.

The adjustment is effected by means of a set-screw, 1r, which passes through a threaded projection, r, on the case, and bears upon the top of the frame B, so

' that, after loosening the nuts of the bolts q and q, the

said case can be raised or lowered and the concave bur I correspondingly adjusted,,to the greatest nicet-y, by simply turning the set-screw 0'.

Thus the mill can be qniokl y and accurately adjusted for either fine oncoa'rse grinding. and is, therefore, particularlarly applicable for farmers use, for grinding cornand other grain into meal of various degrees of fineness.

The bolts 'q and q may in some cases be altogether dispensedwith, and the case be inade adjustable in but I prefer to use these bolts, as they enable the case and frame to be rigidly connected together after roach adjustment of the parts.

When the mill is'. inoperation the feeding of the grain into the space between the bur and concave is regulated by the gate in in the bottom of the be )per, and the meal passes from the outlet or spou to the case into any suitable receptacle.

In constructing the mill it is neccssar y 1 order to permit the above-described vertical adjustment of the case, that the openings in the side plates I; h of-'the same should be elongated or made of somewhat great-ten diameter then the portion of theshaft D, which passes through them; but as these opening are situated at one side of and above the space betweenthe bur and eoncnve, there islittle or no tendency of the grounder partly-ground 'mate ial'to'eseape througl 'l them.

1; The combination of abur revolving in fixed hen'rings, an adjustable case inelo'sing the bur'," aud a eoncave secured to the case, all substantially as described.

thisspeoification in the 2. The ease H, eontaininga concave, I, and adjust able on a frame, B, substantially as described.

v 3. The combination of the adjustable case H and a concave consisting of plain and serrated plates, arranged as set forth. Iu testimonv whereof I have signed my name to witnesses. v

, CHARLES HENRY ROBERTS. Witnesses: 4

' THOMAS ROBERTS,

ASTLEY COOPER ANGOXA.

presence of two subscribing,

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