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US Patent: 501,985
Pipe or Nut Wrench
Patentee:
Peter Armantrout (exact or similar names) - Hoover, IN

USPTO Classifications:
81/100, 81/106, 81/186

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
Peter Armantrout - Hoover, IN
Frederick L. Schneider - Hoover, IN

Manufacturer:
Not known to have been produced

Witnesses:
J. E. Pywell
Harry O. Rohrer
Daniel A. Sunday
Oliver Armantrout

Patent Dates:
Applied: Sep. 02, 1892
Granted: Jul. 25, 1893

Patent Pictures:
Peter Armantrout patent July 25, 1893
USPTO (New site tip)
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Description:
A series of holes in the shank portion of the hook jaw together with a bolt and nut provide size adjustment for this self-adjusting pipe wrench. The broad "fixed" jaw has a square stop which would also facilitate the wrench's use with square nuts.

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