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Description: |
| Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
“Specification of a patent for an Iron Mill, for grinding various articles. Granted to John W. Post, of Washington, D. C. and Calvin Post, of Springport, Cayuga County, New York, April 11th.
The grinding part of this instrument is made either of wrought or cast iron, or of steel; it consists of two parts, one of which moves within the other. The outer part may consist of one solid piece, or of sections, forming a conical tube. The imer part corresponds with the outer. On the grinding surfaces of each are either spiral, perpendicular or cross threads, projections, or furrows, increasing in number, and decreasing in depth, as they approach the vent of the mill. The threads on each may run parallel, being of any inclination required. The inner grinder moves, and the outer one remains. stationary, it being unnecessary that more than one of them should move, although both of them may be made to move, if thought necessary. The lower part of the inner grinder terminates in a pivot, or point, which stands in a cup on a piece of timber, and is raised and lowered with the timber, to set the mill for grinding coarser or finer, by means of screw-bolts and nuts; the bolts passing through the timber which supports the outer grinder.
The upper part of the inner grinder terminates in a shaft, or gudgeon, on which is fixed a long pinion capable of rising and falling with the grinder, from three to eight inches, and still remaining in mash with the driving wheel.
The leading principle of this improvement consists in having the least possible diameter of the grinders at the upper or feeding end; great length and as little increase of diameter at the bottom, or vent, as will merely admit of setting the mill for grinding coarser, or finer.
For a hand mill, the upper, or feeding end, is required to be little more than one inch diameter, and the lower end, or vent, two inches, being two, or more, feet in length, and uniformly tapering from the top to the bottom. By this form and construction the greatest possible mechanical leverage and power is obtained; the mill may move with great velocity, the grain, or article, being introduced as nearly as possible at the fulcrum, or centre of the shaft or grinders, and continuing near the centre until it is discharged, almost any resistance is easily overcome.
For grinding corn with the cobs, bark, apples, or any other coarse article, the upper part of the outer grinder has a funnel top, which contracts gradually in its capacity for a short distance; after which it is continued with a small and uniform increase of diameter, as described in the mill for grain, and other small articles; the whole being three feet in length.
In grinding corn with the cobs, bark, or other coarse articles, the mill may first be set coarse, and after the corn is shelled from the cob, and the cob broken, or the article rendered finer, the mill may be set finer, and the grain, or article, passed through a second time.
For the hand mill, the pinion, which has already been mentioned, may have from ten to twenty cogs; and the driving wheel, which is a faced cog-wheel, may have from fifty to a hundred cogs; to which may be connected, either on the same piece, or on the same shaft, a fly-wheel, all moved by a crank.
For the horse mill, a whorl, instead of the pinion, may be used, receiving a strap from a large horizontal wheel upon a vertical shaft. · Either of the forms of the grinder may be used for breaking grain, or other articles, preparatory for the common flour mill, to which it may be either mediately or immediately connected, as circumstances may require.
Mills may be constructed upon this principle, consisting in part or altogether of stone. The lower part may be stone, so as to make flour of the article ground.
What we claim as new, and as our own invention or discovery, in the above described mill, and for the use of which we ask an exclusive privilege, are, the grinders, as above described, and the mode of regulating the mill both for hand and other power.”
Journal of the Franklin Institute Vol. 6, Sept. 1829 pgs. 201-202
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