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US Patent: 1,830,033
Automatic Nut Wrench
Patentee:
John V. Larson - Chicago, IL

USPTO Classifications:
81/127

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

Assignees:
None

Manufacturer:
Speednut Corp. - Chicago, IL
Hedstrom Industries - Chicago, IL

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 26, 1931
Granted: Nov. 03, 1931

Patent Pictures: [ 1 | 2 ]
John V. Larson patent November 3, 1931
USPTO pdf tiff
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Description:
Automatic wrench patents begin with August Kinderman's Jan. 25, 1870 design patent D3,821. By the 1920s, the patents focus on very subtle features. This patent's focus is on the shape and placement of the gear teeth so that maximum holding power coincides with standard nut sizes falling within the capacity of the wrench.

LARCOLOY automatic nut wrenches used this patent and nos. 1,602,620 and 2,351,821. This patent was also used for Hedstrom Industries LARC-O-MATIC.

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