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US Patent: 2,705,899
Release Mechanism For A Lever Jaw Wrench
Harold A. Berger - Plano, IL

USPTO Classifications:
81/371, 81/372, 81/380

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Metal Engineering Company - Plano, IL

Metal Engineering Company - Chicago, IL

none listed

Patent Dates:
Applied: Oct. 20, 1951
Granted: Apr. 12, 1955

Patent Pictures: [ 1 | 2 | 3 ]
Harold A. Berger patent April 12, 1955
USPTO pdf tiff
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The focus of the patent is the lock release which is a hinged segment of the lever handle. The specifications claim this structure generates sufficient leverage to overcome the locking force of the "over center" link.

A 1954 METCOID (Metal Engineering Co.) ad for their LEVER JAW E-Z ACTION locking plier wrench shows this style of lock release, but cites patent no. 2,592,807.

One known example is marked "GREAT GRIP - EASY ACTION / PAT. NO. 2705899." The patent also was used for early 1950s CRAFTSMAN plier wrenches with "EASY OPEN" handles.

The specifications note patent nos. 2,443,153, 2,532,659, 2,543,922, 2,589,511, 2,590,750, 2,592,803, and 2,604,803 as references.

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