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US Patent: 20,379
Improved Screw-Wrench
Reverse double screw nut wrench
Patentee:
George C. Taft - Worcester, MA

USPTO Classifications:
81/163

Tool Categories:
wrenches : nut wrenches
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
D. A. Hawkins - Worcester, MA

Witnesses:
John Goulding
James H. Bancroft

Patent Dates:
Applied: Oct. 30, 1857
Granted: May 25, 1858

Patent Pictures: [ 1 | 2 ]
George C. Taft patent May 25, 1858 ,with 6-inch example
USPTO pdf tiff
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Description:
Adjusting 'rosette' is threaded to bear against a rack on shank, and has second set of threads engaging threads in the adjustable jaw. In the specifications, Taft distinguishes his patent from Coes' earlier patents 2,054, 9,945 and 11,208, and his own earlier patent 17,609.

This patent, along with 23,725 and 23,798 was "licensed" to Daniel Hawkins, Jr. in 1859.

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