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US Patent: 172,854
Wrench
Improvement in Tap-Wrenches
Patentee:
John J. Grant - Hartford, CT

USPTO Classifications:
408/120

Tool Categories:
wrenches : tap wrenches and die stocks

Assignees:
Pratt & Whitney Co. - Hartford, CT

Manufacturer:
Not known to have been produced

Witnesses:
Theodore G. Ellis
Wendell R. Curtis

Patent Dates:
Applied: Dec. 16, 1875
Granted: Feb. 01, 1876

Patent Pictures:
John J. Grant Patent February 1, 1876
USPTO pdf tiff
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Description:
The gripping jaws are actuated by ratchet action. The inside of the ratchet wheel has "tapered" flanges which engage slots in the gripping jaws, to close or open them. A spring-loaded pawl on one side provides the ratchet action.

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