US Patent: 256,867 - Improved Monkey Wrench


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US Patent: 256,867

Wrench
Improved Monkey Wrench

Patentee:

John Thomson (exact or similar names) - Brooklyn, NY

USPTO Classifications:

81/157, 81/DIG.6

Tool Categories:

wrenches : wrench adjustment types : quick adjust wrenches

wrenches : nut wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Mar. 15, 1882
Granted:	Apr. 25, 1882

Patent Pictures:

John Thomson patent April 24, 1882

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Description:

A leaf spring behind the adjusting screw pushes the screw against matching semi-circular threads in the movable jaw. Pushing the adjusting screw in toward the wrench shanks releases the threads and allows for quick adjustment.