US Patent: 20,211
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| Improved Mode of Fixing the Movable Jaws of Adjustable Wrenches
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Patentee:
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| James McKenzie (exact or similar names) - Green Island, NY |
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Patent Dates:
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| Granted: |
May 11, 1858 |
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Patent Pictures:
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James McKenzie patent May 11, 1858 |
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Stan Schulz
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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.
One known example is marked " J. M. [Mc?] KENZIE PAT.D May 11, 1858 " -- It does not have a screwdriver on the end, nor a socket where one could have been inserted. Examples with the socket are also extant. |
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