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US Patent: 419,854
Pipe Wrench
Don J. Hersey - Providence, RI

USPTO Classifications:
81/135, 81/90.9, 81/94, 81/DIG.6

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

Don J. Hersey - Providence, RI
Henry B. Spitz - Boston, MA

Not known to have been produced

M. B. Harris
G. W. Ballard
S. S. Lapham
John W. Hogan

Patent Dates:
Applied: Aug. 23, 1889
Granted: Jan. 21, 1890

Patent Pictures:
Don J. Hersey patent January 21, 1890
USPTO pdf tiff
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An intermediate lever between the handle and movable jaw has rack teeth that engage teeth on the shaft of the movable jaw. The end of this lever is wider than the body of the wrench to provide a grip surface for adjustment. Springs hold the parts in engagement.

Corresponding British patent GB-189005238 was registered April 5, 1890.

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