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US Patent: 460,230
Three Gripped Self Adjusting Pipe Wrench
Patentee:
Gustaf Gunnarson - San Francisco, CA

USPTO Classifications:
81/186, 81/426, 81/98

Tool Categories:
wrenches : pipe wrenches : pipe tongs
wrenches : wrench components : wrench jaw components

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. R. Carlyle
Burnette G. Haskell
Benjie B. Haskell
Wilhelm Umlong

Patent Dates:
Applied: Sep. 18, 1890
Granted: Sep. 29, 1891

Patent Pictures:
Gustaf Gunnarson patent September 29, 1891
USPTO pdf tiff
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Description:
The patent describes the design considerations that dictate the jaw shape and position of the pivot. As noted by the title, one of the design considerations is that the jaws grip pipe at three places. The results are shown both as a swinging "self-adjusting" hook jaw, and as a "pliers / tongs" pipe wrench.

Corresponding Canadian patent no. CA-42,296 was issued March 14, 1893.

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