USRE347E - Improvement in gri nding-m i lls - Google Patents

Description

A. FELTON.

Grain Mm.

v @N6-V 347.

Etains-sued Jany 29, 1856.

UNITED STATES PATENT OEEICE.

AMORY FELTON, OF TROY, NEW YORK.

IMPROVEMENT IN GRlNDlNG-MILLS.

Specification forming part ofLctters Patent No. 12,181 dated lIanuary 2, 1855; Reissue No. 311 7, dated To @ZZ whom it may concern:

Be it known that I, AMORY FELToN, of Troy, in the county of Rensselaer and State of New York, have invented certain new and useful Improvements in GrindingMills; and I do hereby declare the following to be a full, clear, and exact description of the saine, reference being had to the accompanying drawings, making a part thereof, in which- Figure 1 represents alongitudinal verlical section through the Inill centrally, the cylinder being represented in full, or as uncut. Fig. 2 represents a vertical transverse section, the hopper and shoe not being cut. Fig. 3 represents a detached plan or top view of the concave; and Fi g. represents an internal view of the cap which covers the cylinder, said cap being inverted.

Similar letters of reference in the several figures denote like parts in all.

The nature of my invention relates, rst, to combining with the cylinder and concave a peculiarly-contrived cap with spirall ribs or projections on its under side, which advance the ground material along the cylinder and point, and, secondly, to the reciprocating teeth for agitating the grain, or partially-ground material, to cause it to more readily pass in between the cylinder and concave.

To enable others skilled in the art to make and use my invention, I will proceed to describe the saine with reference to the drawings. A, Figs. l and 2, represents a box or case upon the upper part of which the axis a of the cylinderB has its bearings, a portion ofthe cylinder-say about one-haltl-being within the box or case. The periphery of the cylinder B is corrugated or has teeth upon it, one side of which is radial with the cylinder, the opposite side being oblique or inclined, but not quite tangential with the periphery ofthe cylinder, as shown in Fig. 2. The cylinder is made of cast-iron, chilled cast-iron being preferable; or it can be made of stone, or stone and iron combined, or of any other material. Directly underneath the cylinder B there is a concave, C, of semicircular forni, (see Fig. 2,) and constructed of the saine material as the cylinder. The concave is provided with teeth on about two-thirds of its surface, the

January 29, 1856.

said teeth being precisely similar to the teeth of the cylinder. in semicircular grooves or recesses at the inner sides of the box or case, and directly underneath the concave there is a frame, D, the ends of which fit in the inner sides of the box or case. To the outer edge of this frame an upright rod, E, is attached,having a screwthread cut on its upper end, on which a nut, F, is fitted. The upper end of the screwthread passes through thecenter of a spring, G, the nut F being on the upper side ofthe spring, as shown in Fig. 2.

His a cap which is fitted over the top of the cylinder B. One side of the cap is curved` and corresponds to a portion of the periphery of the cylinder. (See Fig. 2.) At one end of the cap there is an opening, b. The under surface of the cap is provided with spiral anges c, (see Fig. 4,) and the portion ot' the concave c which is not provided with teeth is also provided with spiral flanges c, (see Fig. 3,) which, when the cap is placed over the cylinder, coincide with the iianges of the cap H. (See red dotted lines, Fig. -1.) prevent its choking or clogging at any one) I is a rod which passes longitudinally through the cap H at one side. (See Figs. 1, 2, and 4.) One end of' this rod is bent and fits in an irregular groove, d, cut in the periphery of a pulley, J, which is hung at one endof the aXis a of the cylinder B. The oppositeend of the rod I is bent upward and passes through a slotted plate, K, attached to the end of a slice, L, which is underneath a hopper, M, said hopper being supported by a frame, N, on the upper part of the box or case A. (See Figs. l 2.)

y To the rod l is attached a series of teeth or lingers, e, (see Figs. 1, 2, and 4,) the teeth or iingers being shown by dotted lines in Fig. 1. The teeth or fingers c project downward to a point about on a line with the center of the. cylinder, as shown in Figs. 1 and 2.

At one end of the concave C there is an opening, (see Figs. 1, 2, and 3,) the opening being shown by dotted lines in Fig. 1.

The grain to be ground is placed in the hopper M, and the cylinder B being made to rotate, the grain passes from Athe shoe L, and through the opening b, and then between the cylinder and c oncave, the shake motion being The ends of the concave rest given the shoe by the reciprocating motion of i the rod I, and the reciprocating motion being to pass over the cylinder and between the grinding-surfaces several times before reaching the discharge end, and in such manner as to render it impossible for the grain to pass twice between any portions of thesame grinding-surfaces, thus leaving the passage clear for that which follows, by which means the mill can be fed very fast without clogging. The cylinder and concave are -made of sufficient length so that the grain may be passed through a sufficient grinding-surfacel to reduce it to the desired ineness.

The fingers c vibrate or work with a reciprocating motion at the discharge end of the concave opposite the openingf, and prevent the ground grain from clogging at that part. With many kinds of grain these lingers would not be required; but in grinding oats they are of importance, and may be equally important in grinding other material. They are not, however, in the way when not really serviceable, and as they are operated through the same devices that operate the shoe are altogether a desirable addition to the mill which is designed for any kind ofcrushing and grinding which may be required, and applicableto all.

The concave is adjusted to the cylinder so as to grind coarse or ne by operating the nut F on the upper part ofthe rod E. Although the term cylinder is used in the description of the mill, still it may be of a slight taper form, the concave in suchcase having the same form. By increasing slightly the diameters of the cylinder and concave toward the discharge end it would give a greater grindingsnrface with a given length of cylinder than though they were of the same diameter.

This niill has beenfound in practice to work well, and requires but very little power to drive it. The power of one horse will grind four bushels per hour. i

The mill is intended for farmers, and principally for grinding feed, but works equally well for grinding coffee, spices, drugs, &c., and when made of stone works Well for grinding flour.

Having thus fully described the nature of my invention, what I claim therein as new, and desire to secure by Letters Patent, is-

l. In combination with the cylinder and concave, the cap H, provided with spiral ribs on its under side for carrying forward the ground material toward the discharge end, and thus to make room for that which follows, and prevent clogging or choking, substanA tially as described.

2. In combination with the cylindeljconcave, and cap, the lingers e for agitating the material and causing it to pass more readily in between the cylinder and concave, substantially as described.

AMORY FELTON. VVit-nesses:

A. B. SToUGH'roN, rlI-Ios. H. UPPERMAN.

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