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US Patent: 157,968
David McFarland - Worcester, MA

USPTO Classifications:
81/128, 81/176, 81/DIG.3

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


D. McFarland - Worcester, MA

George C. Taft
S. R. Barton

Patent Dates:
Applied: Nov. 05, 1874
Granted: Dec. 22, 1874

Patent Pictures: [ 1 | 2 ]
David McFarland patent Dec. 22, 1874
USPTO pdf tiff
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The large adjusting worm on the movable jaw combined with the adjustment-locking thumb screw is the most distinctive feature of this patent. Most of the wrenches based on this patent have the angled jaws for axle nuts, and solid metal handles with the open end on one side as shown in the drawing. Wood handled nut wrench versions with flat jaw faces are also rarely found.

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