Cutlery – Perforating or indenting implements – Pivoted handles
Patent
1986-06-11
1987-11-24
Watts, Douglas D.
Cutlery
Perforating or indenting implements
Pivoted handles
30366, B26F 106
Patent
active
047079240
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.
REFERENCES:
patent: 1890955 (1932-12-01), Spengler
patent: 2590750 (1952-03-01), Burns
patent: 2783797 (1957-03-01), Blatt
patent: 2937677 (1960-05-01), McIlwain
patent: 3261073 (1966-07-01), Klenk
patent: 3505714 (1970-04-01), Boileau
Peterson Manufacturing Co., Inc.
Watts Douglas D.
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