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US Patent: 273,461
Wrench
Improved Self-Adjusting Wrench
Patentee:
Joseph Warren Calef - North Easton, MA

USPTO Classifications:
81/127

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

Assignees:
None

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

Witnesses:
Wm. Legher
Fred. G. Dieterich
Chs. F. Darlington
Wm. L. Clark
Benjamin F. Edsall

Patent Dates:
Applied: Feb. 03, 1883
Granted: Mar. 06, 1883

Patent Pictures: [ 1 | 2 ]
Joseph W. Calef patent March 6, 1883
USPTO pdf tiff
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Lowentraut SAMSON wrench (FLICKR)
Description:
This improvement on Calef's April 13, 1880 patent (no. 226,490) changes the shape of the teeth on the handle and sliding jaw.

Both patents were used for the Lowentraut SAMSON self-adjusting wrench.

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