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US Patent: 449,627
Pipe Wrench
Patentee:
Milton H. McNair - Meadville, PA

USPTO Classifications:
81/185.2, 81/384, 81/403, 81/427

Tool Categories:
wrenches : pipe wrenches

Assignees:
Milton H. McNair - Meadville, PA
Edward Smith - Meadville, PA

Manufacturer:
Not known to have been produced

Witnesses:
J. D. Kingsbery
G. A. Tauberschmidt
W. S. Hanson
John Lawson

Patent Dates:
Applied: Jan. 26, 1891
Granted: Mar. 31, 1891

Patent Pictures:
Milton H. McNair patent March 31, 1891
USPTO pdf tiff
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Description:
The hinged jaw's effective gripping range is shifted by the screw linkage which also moves the fulcrum point for the lever handle.

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