Importance

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Abstract

A locking hole punch for punching holes in metal sheets, particularly metal sheets difficult of access such as metal C-studs, is disclosed. This hole punch comprises an arm member that has a head at the end of an outwardly curved portion and a first handle extending from that curved portion. A first lever member formed in a generally mating outwardly curved configuration is pivotably connected to the arm at the top of the arm handle at a first pivot. A generally straight second lever, which acts as a second handle spaced from the arm handle, is pivotably connected to the first lever member at a second pivot near the first pivot. A toggle member is connected to the second lever at a third pivot and to the arm handle at a fourth pivot. When the arm and second handles are pressed together, the toggle member is driven so that the second, third, and fourth pivots are moved into a straightline alignment so that the punch, which includes a punching pin, is driven into a working position with the head. The toggle member can be further driven into a locked mode, which is releasable by operation of a toggle release device. The punching pin can be adjusted to various lengths from the face of the punch by a pin adjusting mechanism. The hole punch is biased from the working position to an open position.

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First Claim