Method for forming opening means in panel

Details Method for forming opening means in panel Method for forming opening means in panel

1978-01-30

1979-04-17

Keenan, Michael J.

113 15A, B21D 5144

Patent

active

041494792

ABSTRACT:
A method of forming a removable section in a metal wall portion of a container is disclosed herein. A first, area of reduced cross-section is coined the wall portion outside the first coined area and most of the displaced metal is forced inside the first area so that the portion inside the first area is in compression and is substantially dish-shaped in cross section, a weakened line is then produced in the first area to define a removable section.

REFERENCES:
patent: 3428210 (1969-02-01), Brown
patent: 3820681 (1974-06-01), Hulse
patent: 3871314 (1975-03-01), Stargell
patent: 3912113 (1975-10-01), Peyser
patent: 3912114 (1975-10-01), Morran et al.
patent: 4036159 (1977-07-01), Gane et al.

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