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US Patent: 7,603
Saw
Teeth for straight and circular saws
Patentee:
Hazard Knowles (exact or similar names) - Washington, DC

USPTO Classifications:
223/72, 83/855

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

Assignees:
None

Manufacturer:
W. B. Gregory & Co. - Albany, NY

Witnesses:
E. L. Brundage
Z. C. Robbins

Patent Dates:
Granted: Aug. 27, 1850

Patent Pictures:
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Vintage Machinery entry for Hazard Knowles
Description:
The patent mentions sawmill blades, either circular or straight, but the only known example of this patent is a handsaw, which is stamped "W. B. Gregory & Co. / Albany / Warranted", and "H. Knowles / Patent / 7 Aug 1850". The sawblade retains its patented teeth. It is likely that sawmill blades, both circular and straight, were manufactured under this patent but such blades only last a few years of use and would have been discarded.

The cutting edges of the patent teeth are swaged outward beyond the edge of the saw plate, and are not set; rather, the swaging provides the side clearance. Because each tooth projects only a small amount from the edge of the saw plate, the saw plate itself acts as a chip limiter to prevent the saw from taking an excessive bit. This chip limiting is claimed to prevent tooth breakage.

There was an article on this patent in the September 1983 (No. 33, p. 5) issue of the MWTCA "Gristmill".

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