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US Patent: 208,059
Wrench
Patentee:
John S. Birch - Orange, NJ

USPTO Classifications:
81/129.5

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
Gustave Dieterich
James T. Graham

Patent Dates:
Applied: Mar. 12, 1878
Granted: Sep. 17, 1878

Patent Pictures:
John S. Birch patent September 17, 1878
USPTO pdf tiff
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Description:
The wrench is self-adjusting; the movable jaw tends to close under the pressure of a compression spring. It is held in position by a toothed cam that bears against an extension of the movable jaw. The cam has side grips to rock it back to release its grip to readjust the wrench.

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