US71733A - garland - Google Patents

Description

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To ALL wHoMuIT MAY CONCERN:

Be it known that I, A. N. GARLAND, of West Charleston, in the county of Orleans, and State of Vermont, have invented a new and improved Millstone Dress and I do hereby declare the following to be a full, clear, Aand exact description of the same, reference being-had to the' accompanying drawings, forming part of this specification, and inA whichn Figure'l is a view of the face of one of the stones.

Figures 2 and 4 are vertical sections through the centre of the-stones a's-they are in'position for working.

Figure 3 is a longitudinal section ofthe pattern used in bosoming the stone. i

i Similar letters of reference indicate corresponding parts fin the several figures.

l In this invention thefurrows are made wide, shallow, and smooth, one edge being cut clean and sharp. Between the furrows the surface near the centre of the stone is smooth, and' at other 'parts of the stone 'is cut like the face of a file. A- new method of bosoming the stone is also used.

In order that others skilled in the artto which my invention appertains may he enabled to make and use the same, 1 will proceed to describe it in detail.

In the drawings, A represents the upper and B the lower stone. A'.lhe channels C C are curved, radiating from the centre, and arranged in `the turbine or vertical manner, having their bottom inclined from the side e c to the deeperside c c', where they terminate at the bottom of aperpendicular wall, the upper'edge of which is carefully dressed and smoothed into a sharp, clear cutting-edge. At the inner end of the lchannels C C thel incline commences at the top of the perpendicular wall 0'., terminating at the bottom of the next one to the right ofV it, thus occupying the whole space between the walls cf c. Atthe outer end ofv thel channels their inclined surface does not occupy the whole distance from e` toe', but only the distance from c to c' on its right, or about one-half'the distance from c to c. The surfaccof stone between the point e and the point c on its right hand,and extending from the outer edge of. the stone to theA line D, is fiat, and cut in iine threads, like the face of a tile, the threads running in the same direction as the channels C C. Inside of the line D the surface of stone between the channels is perfectly smooth. The surface enclosed by the circular line D is designed to-be in proportion to the whole surface of the stone nearly as shown in the drawing, in which the diameter of the circle D is about two-fths the diameter of the whole stone. The depth of the channels CC is onc-eigbth of an inch in the bed-stone, and 'three-'sixteenths of an inch in the upper stone. The inclined bottom surface of the channels 'is'nade perfectly smooth. There is no difference between the channels in the upper and those in the nether stone, except in their depth. To bosom the upper stone, -I make a. pattern, of which a longitudinal section is shown in g. 3, the length of which, from E Ato F, is to be one-half theradius of the storie, and the depth at Gr, the deepest part, about one-sixteenth of an inch, running to nothing at F. is the rod on which it turns, standing vertically in the centre of the'eye. I paint the under side ofthe pattern from E to F, then, while the paint is not dry, apply it to thestone and rotate it till the paint, where it touches,` adheres tothe surface of the stone. 'I then remove the pattern and pick off the painted surface of the stone, continuing the operation till the bosom is formed as desired. This part of the stone is. then to be smoothed as perfectly as possible, as is also the corresponding surface of the bed-stone. l

The old form of channel is cut so as to occupy about one-third of the surface from-c to c',- and is onei quarter of an inch or more in depth. Such a narrow and deep furrow causes a great.V amount' of friction, and the meal'leaves the stone heated, especially in grinding fast. The perpendicular walls c e', with'smooth, sharp, upper edges, prevent the bran from being chopped up, and render the separation of the bran from the flour more perfect. Millers are very liable to break off small particles from the edge of the shouldenor wall c' c', leaving it rough and irregular, imagining that such irregularities can do no harm. The effect, however, is `that the crushed wheat passes over this shoulder, and the bran adhering to it, catches on the sharp points along the rough edge', and is cut and ground'ii'ne,'so that it cannotbe Separated from the our. In my invention these defects in the working of tbc millstones are completely obviated. The ilour runs freely in the smooth, well-defined channels, the air is admitted without obstruction in the deeper channels of the upper stone, the sharp upper Aedges of thewalls c c refuse to tear and grind the bran and the smooth inner surface of stone,\j.f f

inside of the line D, cracks and crushes instead of cutting the kernel, while the threaded file-surface on the outer part of the stone thoroughly pulverizes the flour.

Having thus described my invention, what'I claim as new, and desire to secure by Letters Patent, is-

The mills'tone dress above described, oonsisting of tho smooth-surface inside,'and the le surface out side ofthe line D, together with the smooth shallow channels in the bed-stone, and deeper ones in the runner, the channels in both stones being constructed in the curved form above described, widening towards the rim of the stones,`and haring one smooth inclined surface and one perpendicular wall, e', the upper edge of the wall being sharp and smooth, and all' the parts heingconstrueted and arranged substantially in the manner and for the purposes specified.

A. N. GARLAND. Witnesses vCEYLON COLE, JAMES LEWIS.

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