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US Patent: 2,623,428
Self-Adjusting Pipe Wrench of A Spring-Impelled Trigger Actuator Type
Patentee:
John V. Larson - Chicago, IL

USPTO Classifications:
81/99

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 09, 1947
Granted: Dec. 30, 1952

Patent Pictures:
USPTO pdf tiff
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Description:
This self-closing pipe wrench is an evolution of self-closing wrenches of the type described in patent nos. 1,602,620, 1,830,033, and 2,351,821.

The key elements are the curved fixed jaw, actuating spring, and movable jaw with "trigger" end.

The patent references patent nos. 115,678, 614,255, 1,276,596, 1,337,678, 1,445,211, 1,486,981, 2,028,406, and 2,351,821.

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