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US Patent: 291,934
Wrench
Patentee:
Daniel R. Porter - Revere, MA

USPTO Classifications:
81/99

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Porter Mfg. Co. - Revere, MA

Witnesses:
G. W. Gregory
B. J. Noyes
John F.C. Preinkert
Arthur Tipperton

Patent Dates:
Applied: Nov. 19, 1883
Granted: Jan. 15, 1884

Patent Pictures: [ 1 | 2 ]
Daniel R. Porter patent January 15, 1884
USPTO pdf tiff
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Description:
The wrench has a spring pushing a movable jaw into gripping engagement with the work piece. The specifications call it an improvement on Porter's previous application (issued as pat. no. 291,933).

In the wrench as produced, the spring is fastened to the end of the movable jaw, and slides on the wrench shank. This arrangement appears in Canadian patent CA-20,932.

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