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US Patent: 206,067
Feed Screw and Nut For Rock Drills, etc.
Patentee:
Robert Allison - Port Carbon, PA

USPTO Classifications:
74/441

Tool Categories:
wrenches : auxiliary wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
P. C. Dieterich
W. W. Turner
Wm. McQuade
Frank H. Duffy

Patent Dates:
Applied: Jun. 27, 1878
Granted: Jul. 16, 1878

Patent Pictures:
Robert Allison patent July 16, 1878
USPTO pdf tiff
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Description:
The patent is for a feed screw mechanism with adjustment provisions to compensate for wear. The wrench is described in the specifications and shown in the drawing.

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