US Patent: 291,267 - Pipe Wrench


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US Patent: 291,267

Pipe Wrench

Patentees:

Frank Armstrong (exact or similar names) - Bridgeport, CT

Nathaniel W. Vandegrift (exact or similar names) - Bridgeport, CT

USPTO Classifications:

81/126

Tool Categories:

wrenches : pipe wrenches

Assignees:

Frank Armstrong - Bridgeport, CT

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Jun. 21, 1883
Granted:	Jan. 01, 1884

Patent Pictures:

Frank Armstrong and Nathaniel W. Vandegrift patent January 1, 1884

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Description:

This patent shares an adjustable jaw and handle design with Armstrong and Vandegrift's parallel patent (no. 291,266). The internal linkage within the lower jaw differs.

The adjustable jaw and some aspects of the handle design carried over into the next patents (nos. 298,043 and 392,300) which were put into production.