US Patent: 657,391


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US Patent: 657,391

Wrench

Patentee:

Thomas H. Brosnihan (exact or similar names) - Livermore Falls, ME

USPTO Classifications:

81/171, 81/179, 81/185.2

Tool Categories:

wrenches : pipe wrenches

Assignees:

None

Manufacturer:

Brosnihan Wrench Co. - Worcester, MA

Sargent & Co. - New Haven, CT

Witnesses:

Patent Dates:
Applied:	Dec. 15, 1899
Granted:	Sep. 04, 1900

Patent Pictures: [ 1 | 2 ]

Thomas H. Brosnihan patent Sept. 4, 1900

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Description:

The key elements of the patent are the hardened pipe-gripping jaw faces. The pipe-gripping jaw face on the adjustable jaw slides on a keyway-shaped base, and is pressed outward by a spring.

A Dec. 1911 trade journal item noted the liquidation of the former Brosnihan Wrench Co. manufacturing facilities.