US Patent: 20,379 - Reverse double screw nut wrench


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US Patent: 20,379

Improved Screw-Wrench
Reverse double screw nut wrench

Patentee:

George C. Taft (exact or similar names) - 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

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Vintage Machinery entry for George C. Taft

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.