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US Patent: 65,465
Improvement in Pipe and Stud-Wrenches
Patentee:
Joshua B. Barnes - Fort Wayne, IN

USPTO Classifications:
81/99

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. N. Milliman
R. E. Sloane

Patent Dates:
Granted: Jun. 04, 1867

Patent Pictures:
Joshua B. Barnes patent June 4, 1867
USPTO pdf tiff
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Description:
A spring-activated pawl between the movable jaw and a rack on the jaw end of the handle tightens and holds the grip. As a result, the movable jaw is not free to "relax its grip" on reverse movement of the handle.

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