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US Patent: 1,602,620
Automatic Nut Wrench
Patentees:
John V. Larson - Chicago, IL
August Kuring - Chicago, IL

USPTO Classifications:
81/127

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

Assignees:
John V. Larson - Chicago, IL

Manufacturer:
Speednut Corp. - Chicago, IL

Witnesses:
Unknown

Patent Dates:
Applied: Aug. 30, 1924
Granted: Oct. 12, 1926

Patent Pictures:
John V. Larson and August Kuring patent October 12, 1926
USPTO pdf tiff
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Description:
The focus of this patent is the interposed spring which tends to close the movable jaws. The outside lever is to relax the spring tension when the self-closing feature is not desired.

The self-closing feature worked well until the spring failed. A few examples have survived the intervening decades. The shape and placement of the gear teeth were addressed in Larson's subsequent patent (no. 1,830,033).

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