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US Patent: 449,410
Wrench
Improvements in Pipe and Other Wrenches
Patentee:
Henry Hammond - New Haven, CT

USPTO Classifications:
81/103, 81/163

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. D. Garfield
Wm. S. Bellows
H. A. Chapin

Patent Dates:
Applied: Feb. 24, 1890
Granted: Mar. 31, 1891

Patent Pictures:
Henry Hammond patent March 31, 1891
USPTO pdf tiff
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Description:
Double-speed adjustment accomplished by a nut with interior and exterior threads, a threaded shank on the movable jaw, and threads cut on the interior of the clamping frame.

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