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US Patent: 296,942
Wrench
Patentee:
James Du Shane - South Bend, IN

USPTO Classifications:
81/137, 81/175, 81/DIG.4

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Phil C. Dieterich
A. E. Dowell
William L. Kizer
Willis A. Bugbee

Patent Dates:
Applied: Nov. 30, 1883
Granted: Apr. 15, 1884

Patent Pictures:
James Du Shane patent April 15, 1884
USPTO pdf tiff
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Description:
The wrench has a two-part screw adjustment. The smaller screw works similarly to a "typical" adjusting screw, except that its range of motion is less than the overall adjustment range of the wrench. The larger nut has interrupted threads so that when the gap in its threads align with the main bar of the wrench the movable jaw is free to slide.

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