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US Patent: 451,183
Wrench
Patentee:
George F. Hall - Newark, NJ

USPTO Classifications:
81/144

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

Assignees:
None

Manufacturer:
Alsdorf and Company - Newark, NJ

Witnesses:
Wm. H. Canfield, Jr.
John G. Trusdeu
Wm. H. Camfield, Jr.
Fredk. C. Fraentzel

Patent Dates:
Applied: Feb. 25, 1891
Granted: Apr. 28, 1891

Patent Pictures:
George F. Hall patent April 28, 1891
USPTO pdf tiff
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Description:
Turning the handle clamps or loosens the grip between the wedge and the shank of the movable jaw. Both the wedge and jaw shank have fine serrations. Corresponding British patent GB-189107952 was registered May 8, 1891.

The patent is an evolution of Hall's Nov. 26, 1889 patent (no. 415,969).

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