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US Patent: 111,422
Pipe Wrench
Patentee:
Oramel Graves Barrett - Boston Highlands, MA

USPTO Classifications:
81/100, 81/106

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. R. Snow
R. H. Eddy
S. N. Piper
L. N. Moeller

Patent Dates:
Granted: Jan. 31, 1871

Patent Pictures:
O.G. Barrett Pat. Jan 31, 1871
USPTO pdf tiff
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Description:
The pivot point for the hook jaws can be changed by a series of holes in the jaws and shank. The specifications differentiate this patent from J.H. Doolittle's March 27, 1860 patent (no. 27,622), which has a single hook jaw.

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