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US Patent: 291,933
Wrench
Patentee:
Daniel R. Porter - Randolph, MA

USPTO Classifications:
81/99

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Fred A. Powell
John F. C. Preinkert
W. H. Sigston
Jos. P. Livermore

Patent Dates:
Applied: Jun. 25, 1883
Granted: Jan. 15, 1884

Patent Pictures:
Daniel R. Porter patent January 15, 1884
USPTO pdf tiff
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Description:
The spring between the lever and main handle tends to close the swinging jaw through the intermediate linking mechanism.

The specifications note a later patent application in which the spring acts directly on the jaw (which was issued as no. 291,934).

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