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US Patent: 18,135
Improved Wrench
Hinged Claw and Screw-Adjusting Gripper Wrench
Patentee:
H. M. Clark - New Britain, CT

USPTO Classifications:
81/166, 81/99

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

Assignees:
None

Manufacturer:
H. M. Clark - New Britain, CT

Witnesses:
S. C. Belden
S. E. Case

Patent Dates:
Granted: Sep. 08, 1857

Patent Pictures:
H. M. Clark patent Sept. 8, 1857
USPTO pdf tiff
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Description:
The adjustable toothed portion on handle grips pipe by wedging it against a spring-loaded "hook" jaw. The specifications specifically note and distinguish this design from Bartholomew & Merrick's 1849 patent 6,002 and G.A. Jenks' June 24, 1856 patent 15,184.

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