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US Patent: 341,815
Pipe Wrench
Henry Newton - Providence, RI

USPTO Classifications:
81/185.1, 81/99, 81/DIG.6

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches

Herbert O. Johnson - Boston, MA
Henry Newton - Providence, RI

Not known to have been produced

Joseph J. Scholfield
Chas. F. Schmelz
Socrates Scholfield

Patent Dates:
Applied: Jul. 24, 1885
Granted: May 11, 1886

Patent Pictures:
Henry Newton patent May 11, 1886
USPTO pdf tiff
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A hook-jaw self-adjusting pipe wrench. The patent covers the spring closing the hook jaw, and the replaceable interchangeable toothed piece for the gripping surface of the fixed jaw.

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