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US Patent: 20,211
Improved Mode of Fixing the Movable Jaws of Adjustable Wrenches
Patentee:
James McKenzie - Green Island, NY

USPTO Classifications:
81/142, 81/148

Tool Categories:
wrenches : wrench adjustment types : wedge adjust wrenches
wrenches : nut wrenches

Assignees:
None

Manufacturer:
James McKenzie - Troy, NY

Witnesses:
James Remington
Austin Childs

Patent Dates:
Granted: May 11, 1858

Patent Pictures: [ 1 | 2 ]
James McKenzie patent May 11, 1858
USPTO pdf tiff
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Description:
The sliding jaw adjustment is held in position by a laterally sliding toothed wedge-shaped key that engages teeth cut in the wrench shank. Ken Cope's "American Wrench Makers 1830-1930" cites an 1859 "Scientific American" listing for the McKenzie combination screwdriver and quick adjust wrench.

A known example is marked " J. M. KENZIE PAT.D May 11, 1858 " -- It does not have a screwdriver on the end, nor a socket where one could have been inserted.

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