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US Patent: 6,370
Cutter for tonguing and grooving
Hazard Knowles - Washington, DC

USPTO Classifications:
144/234, 144/235, 144/91.2

Tool Categories:
woodworking machines : machine and tool cutters : cutters

John Levy - New York, NY


W. J. Whipple
W. R. Johnson

Patent Dates:
Granted: Apr. 17, 1849

Patent Pictures: [ 1 | 2 ]
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"Vintage Machinery" entry for Hazard Knowles
Although we don't know who manufactured this side-head during the term of the patent, the 1882 catalog from Daniel Doncaster, Jr., mentions "the celebrated Knowles patent cutter head" in multiple places. The key feature of the Knowles side-head is the use of cutters that are circular segments: after each cutter is sharpened it is simply advanced slightly in its groove so that the cutting circle remains exactly the same. Furthermore, the cutter's shape determines the cut profile and sharpening a cutter merely involves flattening its end, which is simple and reproducible. The patent calls for two or three cutters; the Doncaster version has five cutters. Also, because the cutters are circumferential in shape, they can be manufactured by turning rings on a lathe and then cutting up each ring into multiple (probably four) cutters.

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