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US Patent: 492,834
Pipe Wrench
Patentee:
George W. Porter - Parkersburg, WV

USPTO Classifications:
81/108

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
William Henry Mayberry
Walter Edmund McDougle
John Grigsley McCluer
Albert B. Blackwood
Jos. H. Blackwood

Patent Dates:
Applied: Nov. 09, 1891
Granted: Mar. 07, 1893

Patent Pictures:
George W. Porter patent March 7, 1893
USPTO pdf tiff
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Description:
The swinging hook jaw pivots from a block threaded on the main shank. A leaf spring attached to the block forces the hook jaw into gripping position in relation to the jaw face on the main shank.

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