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US Patent: 221,633
Pipe-Wrench
Patentee:
John H. Vinton (exact or similar names) - Bridgeport, CT

USPTO Classifications:
81/108, 81/164

Tool Categories:
wrenches : wrench components : wrench handle components
wrenches : pipe wrenches

Assignees:
Frank Armstrong - Bridgeport, CT

Manufacturer:
Not known to have been produced

Witnesses:
John Tyler
F. W. Howard
M. M. Rohrer
Wm. C. McIntire

Patent Dates:
Applied: Oct. 23, 1878
Granted: Nov. 11, 1879

Patent Pictures:
John H. Vinton patent November 11, 1879
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Description:
The handle screws in and out to adjust the "fixed" jaw. That jaw is held tight against the handle by an internal coil spring. The hook jaw has a stop to prevent its swinging back against the handle.

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