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US Patent: 1,377,772
Wrench
Patentee:
Alton Bunker Heimbach - Duluth, MN

USPTO Classifications:
81/134, 81/141

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

Assignees:
None

Manufacturer:
Lever Wrench Co. - Duluth, MN

Witnesses:
S. Geo. Stevens
A. M. Ouellette

Patent Dates:
Applied: May 21, 1919
Granted: May 10, 1921

Patent Pictures:
Alton B. Heimbach patent May 10, 1921
USPTO pdf tiff
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Description:
The patent is an improvement of Heimbach's June 8, 1915 patent (no. 1,142,426). The improvements are the curved handle which enables the head to reach into places difficult of access, modifications to the adjusting lever, and the movement stop lug at the top of the extension on the movable jaw.

Extant Heimbach wrenches marked HEIMBACH PATENT 1915 incorporate some of the features noted in this patent -- most notably the movement stop on the jaw extension.

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