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US Patent: 255,182
Wrench
Improved Differential Self-Adjusting Wrench
Patentee:
Milton H. McNair - Meadville, PA

USPTO Classifications:
81/97

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
McNair Wrench Co. - Meadville, PA
Meadville Vise and Tool Co. - Meadville, PA

Witnesses:
L. Barr
T. L. Rossiter

Patent Dates:
Applied: Aug. 24, 1880
Granted: Mar. 21, 1882

Patent Pictures:
Milton H. McNair patent March 21, 1882, with McNair Wrench Co. wrench.
USPTO pdf tiff
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Description:
The movable jaw is described as a "serrated-faced cam." It is moved by a spring-loaded push button. The spring also keeps the jaw in contact with the work piece.

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