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US Patent: 226,490
Wrench
Patentee:
Joseph Warren Calef - North Easton, MA

USPTO Classifications:
81/127

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

Assignees:
Joseph Warren Calef - North Easton, MA
Austin Demmons Cable - Montreal, QC Canada

Manufacturer:
Peter Lowentraut - Newark, NJ
P. Lowentraut Manufacturing Co. - Newark, NJ

Witnesses:
Fred. G. Dieterich
Albert H. Krause
J. Brossoit
J. B. Ostell

Patent Dates:
Applied: Jan. 31, 1880
Granted: Apr. 13, 1880

Patent Pictures:
Joseph W. Calef patent April 13, 1880
USPTO pdf tiff
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Description:
This self-adjusting wrench operates by gear-teeth on the inner end of the swinging handle engaging rack teeth on the back side of the movable jaw.

The U.S. patent was preceded by Canadian patent CA-10,613 issued Nov. 5, 1879.

This patent along with Calef's March 6, 1883 patent (no. 273,461) was used in P. Lowentraut's SAMSON self-adjusting wrench.

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