Petersen Manufacturing Co., Inc.

Ralph Petersen

A hand tool which comprises a fixed handle with a fixed jaw on the front portion and a movable jaw pivotally connected to the front portion of the fixed handle. A movable handle is connected to the movable jaw. An adjusting mechanism is provided for adjusting the position of the movable jaw relative to the fixed jaw and consists of a threaded opening in the rear of the fixed handle and a screw member received within the opening. The screw member has a plurality of multiple first individual threads with the same diameter and pitch that mate with the threaded opening in the fixed handle.

Rapid jaw adjustment for tools and the like

A quick release for a conventional plier-type, toggle-locking hand tool comprises a compound toggle link. The new link is pivotably mounted between the movable handle and the conventional toggle member. Four pivot points rather than the usual three form the 'power line' of the tool. Locking the tool involves pushing the two internal pivot points inwardly across the power line. Release involves opening the handles which moves the internal pivot points back across the power line. Depending on the dimensions of the actual hand tool, the mechanical advantage of the novel compound link is between 4 to 16.

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DeWitt, NE, United States of America

Ralph Petersen