US Patent: 583,741


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US Patent: 583,741

Wrench

Patentee:

Karl Gerhardt (exact or similar names) - Hartford, CT

USPTO Classifications:

81/128, 81/179

Tool Categories:

wrenches : wrench adjustment types : self-adjust wrenches

wrenches : nut wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Fred. J. Dole

Chas. D. King

Geo. A. Hoffman

Patent Dates:
Applied:	Feb. 15, 1897
Granted:	Jun. 01, 1897

Patent Pictures:

Karl Gerhardt patent June 1, 1897

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Description:

Self-adjusting nut wrench employing sliding jaws on opposite faces of a wedge-shaped opening. Springs act to return the jaws to "open" position when the closing pressure is released.