Machine for making can ends having rupturable closures

Details Machine for making can ends having rupturable closures Machine for making can ends having rupturable closures

1976-04-16

1977-06-28

Keenan, Michael J.

113121C, B21D 5144

Patent

active

040318362

ABSTRACT:
In a punch press for making metal can tops with closures, respectively, especially those closures of easy-open construction involving an integral but fractured section, cooperative dies are caused in each cycle to perform at a single station first a forming operation, then a peripheral coining step, preferably during the last phase of the forming, and lastly a primary and a secondary swaging or "fracture sealing" operation, the latter occurring as the dies separate. The invention, though not so limited, is applicable to production of can tops of the type disclosed in U.S. Letters Pat. No. 3,881,630, for example, and has particular merit in enabling can top production to occur largely at a single station. It thus conserves manufacturing space as well as lowers cost.

REFERENCES:
patent: 2136933 (1938-11-01), Calleson
patent: 2434375 (1948-01-01), Van Saun
patent: 3580200 (1971-05-01), Cvacho
patent: 3760752 (1973-09-01), Geiger
patent: 3768295 (1973-10-01), Cudzik
patent: 3881437 (1975-05-01), Lovell
patent: 3967751 (1976-07-01), Gane et al.

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