Method of producing an easily openable container closure having

Details Method of producing an easily openable container closure having Method of producing an easily openable container closure having

1979-08-13

1981-08-18

Goldberg, Howard N.

113120Q, 113121C, B21D 5126

Patent

active

042840236

ABSTRACT:
A method of producing an easily openable container closure which has (1) a shell of with unitary structure including a top and cylindrical skirt, the top having an annular top surface portion leading to the upper end of the skirt and a pull ring connected to a part of the inner peripheral edge of the annular top surface portion by a linking piece, and the annular top surface portion and the skirt having a pair of breaking weakened lines extending from both side edges of the linking piece. A set of lance slits is formed in a metal blank, and a pair of weakening lines is formed spaced from each other at a predetermined distance in the circumferential direction and extending over a predetermined distance from near the lance slits toward the center of a circular portion located inwardly of the lance slits. An opening is punched out of the circular portion and the circular portion located inwardly of the lance slits is drawn to form a shell having a circular top with said opening therein and a substantially cylindrical skirt continuous therewith. A slit is formed along said opening spaced a predetermined distance outwardly from the opening. The portion between the opening and the slit is then bent to form a pull ring, and the thus formed shell is separated from the metal blank.

REFERENCES:
patent: 3195756 (1965-07-01), Luviano
patent: 3920142 (1975-11-01), Vandrebeck
patent: 3963141 (1966-06-01), Liu
patent: 4003488 (1977-01-01), Moller

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