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US Patent: 364,765
Wrench
Improvements in Screw-Wrenches
Patentee:
Rufus B. Marks - Newark, NJ

USPTO Classifications:
81/161

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Emil Herter
C. L. Sundgren
Henry J. McBride
Fredk. Haynes

Patent Dates:
Applied: Sep. 30, 1886
Granted: Jun. 14, 1887

Patent Pictures:
Rufus B. Marks patent June 14, 1887
USPTO pdf tiff
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Description:
The shank is trapezoidal with threads cut on the corners. The adjusting nut is threaded, with provisions for ability to slide freely at some point in its rotation. A secondary nut or abutment collar provides additional adjustment capability.

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