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US Patent: 106,129
Improvement in Duplex Wrench
Nut-Wrench
Patentee:
Augustus Ball Davis - Philadelphia, PA

USPTO Classifications:
81/93

Tool Categories:
wrenches : pipe and nut combination wrenches

Assignees:
None

Manufacturer:
Philadelphia Tool Co. - Philadelphia, PA

Witnesses:
Wm. A. Steel
Jus. B. Harding
Harry Smith

Patent Dates:
Granted: Aug. 09, 1870

Patent Pictures:
A. B. Davis Pat. Aug. 9, 1870
USPTO pdf tiff
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Description:
This combination nut and pipe wrench is an improvement on Davis' August 24, 1869 patent (no.94,085). The adjusting nut is rounded on the top and bottom to allow for a rocking motion for the pipe wrench function. To cut down on weight, the inside of the movable jaw is hollow. The manufactured wrench also incorporates additional improvements Davis patented on November 14, 1871 (pat. no. 120,947).

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