US Patent: 208,059


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US Patent: 208,059

Wrench

Patentee:

John S. Birch (exact or similar names) - 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

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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.