Container closure with increased strength

Details Container closure with increased strength Container closure with increased strength

1987-12-08

1989-05-23

Pollard, Steven M.

Receptacles

Receptacle side wall made of two or more layers of material...

Beverage receptacle

220 67, 413 8, B65D 808

Patent

active

048322237

ABSTRACT:
A metal closure for a container includes a center panel, a center-panel ring with a convex curved surface, and an inner leg. The metal closure is provided with a band formed by at least coining to increase the buckling pressure. The band is defined as one of intersecting strain fields. The coining cold-works a total uncoined curvilinear length that includes a portion of the center-panel ring, and that optionally includes a portion of the center panel and/or a portion of the inner leg. In one embodiment, the coining produces two frustoconical coined surfaces. In another embodiment, the coining produces a curvilinear coined surface with a generally constant coin residual.

REFERENCES:
patent: 3406866 (1968-10-01), Jasper
patent: 3441170 (1969-04-01), Khoury
patent: 3774801 (1973-11-01), Gedde
patent: 3894652 (1975-07-01), Brown
patent: 4027612 (1977-06-01), Herbst
patent: 4031837 (1977-06-01), Jordan
patent: 4109599 (1978-08-01), Schultz
patent: 4215795 (1980-08-01), Elser
patent: 4254890 (1981-03-01), Westphal
patent: 4354784 (1982-10-01), Westphal
patent: 4448322 (1984-05-01), Kraska
patent: 4577774 (1986-03-01), Nguyen
patent: 4606472 (1986-08-01), Taube et al.

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