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US Patent: 15,184
Pipe Wrench
Wrench for Gas-Pipe, etc.
Patentee:
Gustavus A. Jenks - Worcester, MA

USPTO Classifications:
81/107, 81/97

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. B. Dexter
Wm. N. Green

Patent Dates:
Granted: Jun. 24, 1856

Patent Pictures:
Gustavus A. Jenks patent June 24, 1856
USPTO pdf tiff
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Description:
The wrench has teeth on the end of the handle stock, and a spring loaded hook jaw mounted on the adjustable portion. The overall leverage of the wrench increases as the jaws are opened. The specifications cite this as an improvement on Bartholomew & Merrick's 1849 patent 6,002 (shown as Fig. 1 in the drawings), where the leverage decreases as the jaw opening increases.

This patent noted in patent no. 18,135.

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