Method of making weakening lines in sheet metal

Details Method of making weakening lines in sheet metal Method of making weakening lines in sheet metal

1976-05-24

1977-07-19

Keenan, Michael J.

B21D 5144

Patent

active

040361608

ABSTRACT:
A new sequence of steps provides more control in the formation in sheet metal of weakening lines of the type characterized by an integral yet fractured section. Basically, the method employs, in making so-called easy-open can ends, for example:

REFERENCES:
patent: 2444463 (1948-07-01), Nordquist
patent: 3881437 (1975-05-01), Lovell et al.
patent: 3881630 (1975-05-01), Lovell et al.

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