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US Patent: 419,816
Wrench
Improved Pipe Wrench
Patentee:
Benjamin G. Berrien, Jr. - Yonkers, NY

USPTO Classifications:
81/365, 81/391, 81/427, 81/97

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. R. Ferguson
William H. Robinson
C. S. Burnham
John S. Stilwell

Patent Dates:
Applied: Nov. 13, 1888
Granted: Jan. 21, 1890

Patent Pictures:
Benjamin G. Berrien, Jr. patent January 21, 1890
USPTO pdf tiff
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Description:
The secondary lever acts as a "pry" against spurs on the back side of the swinging gripping jaw to tighten the grip. The swinging jaw may swing freely, or have a leaf spring to hold it in "closed" position.

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