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US Patent: 179,456
Wrench
Improvements in Monkey-Wrenches
Patentee:
Luther M. Johnson - La Grange, OH

USPTO Classifications:
81/141

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

Assignees:
Luther M. Johnson - La Grange, OH
George D Johnson - La Grange, OH

Manufacturer:
Unknown

Witnesses:
E. G. Johnson
A. J. Blanchard
Ed. J. Nottingham
F. O. M'Cleary

Patent Dates:
Applied: May 18, 1876
Granted: Jul. 04, 1876

Patent Pictures: [ 1 | 2 ]
Luther M. Johnson Pat. July 4, 1876
USPTO pdf tiff
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Description:
The extended shank on the movable jaw has a row of rack teeth. The shank has a single tooth enclosed within a housing that also has a cam lever. The cam lever locks the selected adjustment.

A known example of the wrench has no visible markings.

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