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US Patent: 178,162
Edward H. Knight - Philadelphia, PA

USPTO Classifications:
81/157, 81/175, 81/361, 81/389

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


Edward H. Knight - Philadelphia, PA

A. P. Grant
John A. Wiedersheim

Patent Dates:
Applied: Mar. 31, 1876
Granted: May 30, 1876

Patent Pictures:
Edward H. Knight Pat. May 30, 1876
USPTO pdf tiff
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The wrench combines a screw-adjusting movable jaw with a "fixed" jaw that can be held in position by an auxiliary handle, or released to move against a tensioning spring. The resulting freedom of motion allows "ratchet" type action in restricted spaces.

Corresponding British patent GB-187602550 was granted June 20, 1876.

Ken Cope's "American Wrench Makers 1830-1930" cites an 1877 "Iron Age" listing for Knight's Ratchet Screw Wrench, and the June 1988 issue of the Missouri Valley Wrench Club Newsletter reprints a patent summary and "new product announcement" from 1876 issues of "Iron Age." One account of the 1876 "Philadelphia World's Fair" notes this wrench among the wrenches displayed.

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