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US Patent: 392,300
Wrench
Patentees:
Nathaniel W. Vandegrift - Bridgeport, CT
Frank Armstrong - Bridgeport, CT

USPTO Classifications:
81/166, 81/99

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Armstrong Mfg. Co. - Bridgeport, CT

Witnesses:
H. L. Smith
May E. Stickles

Patent Dates:
Applied: Oct. 15, 1887
Granted: Nov. 06, 1888

Patent Pictures: [ 1 | 2 ]
Armstrong and Vandegrift Pat. Nov. 6, 1888
USPTO pdf tiff
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Description:
This modification of Vandegrift's May 6, 1884 patent (No. 298,043) lengthens the adjustable jaw and frame so the threaded portion of the adjustable jaw does not extend to the bearing surface of the frame.

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