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US Patent: 325,010
Wrench
Patentee:
Daniel R. Porter - Revere, MA

USPTO Classifications:
81/103, 81/129.5

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. Planta
Milton Chase
J. H. Adams

Patent Dates:
Applied: Apr. 08, 1885
Granted: Aug. 25, 1885

Patent Pictures:
Daniel R. Porter patent August 25, 1885
USPTO pdf tiff
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Description:
The quick adjust jaw is connected to the main bar by an intermediate frame. A leaf spring in the frame holds the jaw's adjustment, and a second leaf spring on the main bar holds the intermediate frame and jaw assembly in gripping position.

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