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US Patent: 303,385
Art of Making the Screw And Head For Wrenches
Making Screws For Monkey Wrenches
Matthew E. Campfield - Cleveland, OH

USPTO Classifications:
411/397, 76/114, 81/171

Tool Categories:
wrenches : wrench components
wrenches : wrench adjustment types : screw adjust wrenches


Cleveland Screw Wrench Company - Cleveland, OH
Sterling Wrench Co. - Sterling, OH

F. R. Tibbits
M. G. Norton

Patent Dates:
Applied: Jan. 09, 1884
Granted: Aug. 12, 1884

Patent Pictures: [ 1 | 2 ]
Matthew E. Campfield patent Aug. 12, 1884
USPTO pdf tiff
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The patent is for a method of making the adjusting screw for the monkey wrench described in Campfield's May 9, 1882 patent (no. 257,468).

The "head resembling a gear pinion" appears on Cleveland Screw Wrench Company wrenches with ferules matching the May, 1882 Campfield patent. A known example marked with the patent date and "STERLING, O." is evidence for a second manufacturer.

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