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US Patent: 2,351,821
Hand Tool
Hand Tools of the Wrench Type
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, INC. - Chicago, IL

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 06, 1942
Granted: Jun. 20, 1944

Patent Pictures: [ 1 | 2 ]
John V. Larson patent June 20, 1944
USPTO pdf tiff
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Description:
From the specifications: The patent relates to the construction of hand tools such as those described in patent numbers 1,602,620 and 1,830,033. The main new features are having pivot trunnions integral to the handle, rather than having the pivot be a separate pin passing through holes in the other parts, and having the "nib" extending which facilitates opening the jaws.

Known examples marked 1)AUTOMATIC PAT PEND LARCOLOY CHICAGO USA, with arrows on the handle indicating the pull direction, and 2) 10 IN. LARC-O-MATIC PAT. 1830033 - 2351821 // CHICAGO O-H TOOLS HEDSTROM INDUSTRIES INC.

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