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US Patent: 930,472
Valve Grinder
Frank I. Harding - Cleveland, OH

USPTO Classifications:
451/117, 74/320, 74/74

Tool Categories:
specialty tools : valve grinding tools


Not known to have been produced

A. L. Lord
H. R. Sullivan
John P. Dempsey
James G. Bachman

Patent Dates:
Applied: May 06, 1909
Granted: Aug. 10, 1909

Patent Pictures:
Frank I. Harding patent Aug. 10, 1909
USPTO pdf tiff
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Reciprocating rotary motion for the "bit" provided by opposing "mutilated bevel gears" with unequal numbers of teeth. The "bit" has a square shank that slides in the driving gear, and is pressed against the valve by a compression spring. The frame of the grinder is stabilized above the valve by a tripod.

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