Punch pin head structure

Details Punch pin head structure Punch pin head structure

1986-04-28

1987-10-20

Watts, Douglas D.

Cutting

Tool or tool with support

Cutting couple type

30366, 834411, 83622, 83626, B26F 114

Patent

active

047006013

ABSTRACT:
Punches for paper and the like have a metal pin having a male punch element formed on one end and a pressure application area on the opposite end. To withdraw the punch pin an enlargement is formed at or near the opposite end, the enlargement cooperating with a gripper or a spring in the punch to cause the pin to retract when the pressure applicator retracts. In accordance with the present invention a circumferential groove is formed in the punch pin and a collar of plastic material is formed around the pin protruding into said groove and functioning as the enlargement.

REFERENCES:
patent: 1863801 (1932-06-01), Lorber
patent: 3191462 (1965-06-01), Plunske
patent: 4077288 (1978-03-01), Holland
patent: 4079647 (1978-03-01), Elder et al.

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