US Patent: 179,456 - Improvements in Monkey-Wrenches


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US Patent: 179,456

Wrench
Improvements in Monkey-Wrenches

Patentee:

Luther M. Johnson (exact or similar names) - 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:

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

Patent Pictures: [ 1 | 2 ]

Luther M. Johnson Pat. July 4, 1876

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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.