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US Patent: 5,056,385
Compound Toggle Link
Ralph Petersen - DeWitt, NE

USPTO Classifications:
81/367, 81/370, 81/377, 81/380

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Petersen Manufacturing Company, Inc. - DeWitt, NE

Irwin Industrial Tools - Huntersville, NC


Patent Dates:
Applied: Apr. 30, 1990
Granted: Oct. 15, 1991

Patent Pictures:
Ralph Petersen patent October 15, 1991
USPTO pdf tiff
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The patent is for a toggle link with four pivot points in the "power line." The fourth pivot is a secondary piece in the swing lever handle. Used together with pat. no, 6,626,070 in Vise-Grip (tm) Fast-Release (tm) tools. In 2015, the patents also appear on CRAFTSMAN (tm) branded locking pliers.

The patent has an extensive history of toggle locking tools and related prior art. The text has two series of prior art patents. The first relates to quick release; the second to toggle locking tools.

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