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US Patent: 66,692
Improvement in saws
James E. Emerson - Trenton, NJ

USPTO Classifications:

Tool Categories:
woodworking machines : circular saws : saw teeth
woodworking machines : machine and tool cutters : saw teeth


American Saw Co. - Trenton, NJ

Charles A. Pettit
Charles D. Smith

Patent Dates:
Granted: Jul. 16, 1867

Patent Pictures:
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"Vintage Machinery" entry for James E. Emerson
An advertorial in the 1868-02-01 issue of Scientific American features this invention, complete with four engravings.

The principle of this invention is that below each gullet there is a series of semi-circular holes. When a tooth is sharpened, the gullet is filed down to the next semi-circular hole. The semi-circle defines the bottom of the gullet, avoiding the stress concentration of a sharp gullet. This innovation was heavily promoted by the American Saw Co.

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