Hole punch apparatus

Details Hole punch apparatus Hole punch apparatus

1982-09-30

1985-01-29

Bell, Paul A.

Cutlery

Perforating or indenting implements

With portion positioned in work aperture

30361, 408710, B26F 100, B23B 500

Patent

active

044956991

ABSTRACT:
Hole punch apparatus comprises a worm and worm wheel whereby an ordinary electric drill can be employed to punch holes in sheet metal by means of a punch and die. The several disclosed structures variously comprise a shear pin for preventing overload, a handle for rapid engagement of the punch and die with the workpiece, bushings to protect against unusual torques, and special threads.

REFERENCES:
patent: 382947 (1888-05-01), Brown
patent: 1315100 (1919-09-01), Dufresne
patent: 2222064 (1940-11-01), Benner
patent: 2633197 (1953-03-01), Nischan
patent: 3025600 (1962-03-01), Leibinger

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