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US Patent: 186,155
Wrench
Patentee:
Oliver B. North - New Haven, CT

USPTO Classifications:
81/171

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

Assignees:
O. B. North & Co. - New Haven, CT

Manufacturer:
O. B. North & Co. - New Haven, CT

Witnesses:
Samuel Brace
Geo. P. North
J. H. Shumway
Clara Broughton

Patent Dates:
Applied: Jun. 14, 1876
Granted: Jan. 09, 1877

Patent Pictures:
Oliver B. North patent Jan. 9, 1877 with 6 inch example
USPTO pdf tiff
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Description:
This improvement to North's January 11, 1876 patent (no. 172,155) replaces the rack and pawl adjustment with a screw-adjustment. The base for the adjusting screw is slid on to the handle and "crimped" into a notch in the shank casting before the "loop" portion of the handle is expanded.

North's monkey wrenches cite both patents.

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