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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.
“For an improvement in the mode of Hanging and Straining Saws; Levi Chapin, Walpole, Cheshire County, New Hampshire, October 13.
The plan proposed is intended to render the ordinary saw frame unnecessary in the straining of mill saws. Two wheels, or drums, are placed one over the other, each working upon gudgeons. The boxes of the upper gudgeons are to be stationary, those of the lower ones are to work in a slat, so that by means of a wedge, or a lever and weights, the drum may be forced down for the purpose of straining the saws. A band, or chain, passes over the upper drum, and another under the lower drum; to the ends of these bands, or chains, saws are to be fixed by stirrups; the two chains, and two saws, when thus united, form a continued band round the two drums, or wheels; an alternating, crank motion, communicated to one of the drums, will cause the saws alternately to ascend and descend. The novelty, and improvement claimed "consists in hanging two saws, without the use of saw frames and gates, and wholly relieving the crank, or power, necessary to operate saws, from the heft or burthen of any apparatus necessary to hang or strain saws, leaving all the power to operate the saws in the work. The principle is intended to embrace all the various forms in which sawing is required, whether by means of wheels, cylinders, or drums, or parts of either, or by use of chains, ropes, belts, or springs, or by forcing the strain by the power of the wedge, lever, or screw, of whatsoever materials they may be formed." The above claim appears to us to be much too broad and general. The particular mode described by the patentee is probably new, but the idea of a saw acting as a band, strained over drums, is old. By turning to the article saw, in Rees' Cyclopædia, it will be seen that a patent was obtained in England, many years ago, for a saw forming a continued band, working over two wheels, or drums, not by a vibratory, but by a continued motion.”
Journal of the Franklin Institute, V5, Jan., 1830, pgs. 30-31
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