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US Patent: 27,622
Improved Pipe-Wrench
Patentee:
J. H. Doolittle - Ansonia, CT

USPTO Classifications:
81/106

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
George Bristol
George L. Bisstol

Patent Dates:
Granted: Mar. 27, 1860

Patent Pictures:
J. H. Doolittle patent March 27, 1860
USPTO pdf tiff
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Description:
The wrench features a swinging hook jaw pivoting on a movable base. The base has an internal lip which engages one of several notches on the shank. Swinging the hook jaw fully away from the shank frees the base to move to set the size adjustment.

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