US244189A - Millstone-face - Google Patents

Description

(ModeL) G; A. COLE-S.

MILLSTONE I AGE No. 244,189. Patented July 12,1881.

ATTORNEYS.

N4 PEIERS. Phow-Lillmgnphor. Washingwm D. c

PATENT OFFICE.

GEORGE A. COLES, OF MIDDLETOWN, CONNECTICUT.

M l LLSTO N'E-FAC E.

SPECIFICATION forming part of Letters Patent No. 244,189, dated July 12, 1881.

Application filed July 22, I880. (Model) To all whom it may concern:

Be it known that I, GEORGE AUGUSTUS COLES, a citizen of the United States, residing at Middletown, in the county of Middlesex and State of Connecticut, have invented a new and useful Improvement in Millstone Dress, of which the following is a full, clear, and exact description, reference being had to the drawings hereto annexed.

The object of my invention is to save middlings by preventing the granules formed in the furrows from being crushed or pulverized by the lands as the said middlings make their way toward the skirts of the stones.

My invention consists in connecting the main furrows of a millstone by channels made severally at right angles to a given radius of the face of the stone, and being limited in extent by said furrows and distributed over the working-surface of the stone from the bosom to the skirt thereof, as hereinafter described.

In the accompanying drawings, Figure l is a plan view of a portion of a millstone illustrating my improvement; Fig. 2, a sectional elevation taken through the line aat, Fig. 1; and Fig. 3, a sectional elevation taken through the line y y, Fig. 1.

During recent years the science of milling has materially changed, and the methods formerly considered satisfactory are now almost entirely abandoned, while new ones are being adopted to meet the requirements of the state of the art brought about by the progressive development of the purification of middlings, so that every system which leads to pulverization instead of granulation of wheat between millstones is being rejected by the more advanced millers. It is necessary under any known system, in order to produce granules or middlings, to have but a small proportion of the face left for lands, as it will be readily seen that the movement of the stone over the grain across the lands, if the lands are in large proportion, must pulverize all the farina which comes between said lands, and at the same time a considerable percentage of the husk and woody fiber found in wheat.

Referring to the drawings, A represents a portion of a millstone, of which B is the eye, C the bosom, D the furrows, E the lands, and F the skirt. The bosom C extends from the eye about one-third the distance to the skirt, and is deeply recessed, thus enabling the grain to pass freely between the stones, and allowin g all necessary ventilation. The furrows D, as usually constructed, are in the proportion of about sixty to the stone, thus making the lands E very narrow, and are constructed with a slight obliquity with respect to the radii of the stone, in order that the centrifugal tendency of the granules may be checked sufficiently to allow of their perfect formation and purification before passing out at the skirt. Across the lands E, and severally at right angles with a given radius of the face of the stone, are formed smooth shallow channels G, which are so arranged in the direction of motion that they can have no grinding or pulverizing effect, as they would necessarily have if they were made at right angles with the furrows, or in any other direction than the direction of motion. The channels G are made of only sufficientwidth and depth to allow the granules of the middlings to pass through them without being pulverized, and are arranged closely together, so as to leave just face enough upon thelands to clean the bran without a secondary process.

With this construction,when the-millstones are at work, the kernels of grain are crushed in the furrows D and the granules of the middlings pass along the furrows D, through the channels G to the next furrows D, along the said furrows D to the next channels G, through the said channels G to the next furrows D, and so on, as they are impelled by the motion of the stones and by the centrifugal force engendered by the said motion, to the skirts of the stones, where they pass out. In this way the granules of middlings are kept from being crushed and pulverized to flour, so that a larger yield of middlings with their granules in more perfect shape will be obtained than has heretofore been possible. The flour will be removed from the bran also as it passes between the millstones, thus obviating the necessity of passing the bran through rolls or submitting it to any secondary process, thereby obtaining a greater yield and better grade of flour from first bolting, besides a larger percentage of highergrade flour from middlin gs with correspondingly improved quality.

I am aware that it is a common thing to connect the main furrows of a millstone by drift-channels of various arrangement; but heretofore such channels have been constructed with such a degree of obliquity with respect to the line of motion that the tendency has been to crush the granules instead of passing them out in a pure and perfect condition.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- In combination with the main furrows of a millstone-face, the channels G, made severally at right angles to a given radius of the face of the stone, and being limited in extent by said furrows and distributed over the work- 1 5 ing-surface of the stone from the bosom to the skirt thereof, substantially as shown and described, whereby the pulverization of the granules shall be prevented as they pass from furrow to furrow, as set forth.

GEORGE AUGUSTUS OOLES. Witnesses:

FRANK B. WEEKS, UHAs. G. R. VINAL.

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