EP 0103074 A3 19840523 - INCREASED STRENGHT FOR METAL CLOSURES THROUGH REVERSING CURVED SEGMENTS

Title (en)

INCREASED STRENGHT FOR METAL CLOSURES THROUGH REVERSING CURVED SEGMENTS

Publication

EP 0103074 A3 19840523 (EN)

Application

EP 83105729 A 19830610

Priority

US 41619882 A 19820909

Abstract (en)

[origin: EP0103074A2] The present invention relates to improvements in the strength of ends used on metal beverage containers. Such ends generally comprise a center panel of a substantially planar character, a surrounding annular grooved portion or countersink made up of an inner panel wall, a chuckwall and a first upwardly bowed arcuate segment integrally joining the inner wall and the chuckwall, and a second downwardly bowed arcuate segment integrally joining the inner wall and the center panel. In accordance with the present invention the second arcuate segment is reversed by herein disclosed tooling to provide the closure with three reversing arcuate segments between the inner wall and the center panel and a reduced center panel diameter. The closure so formed exhibits an increase in buckle resistance between 8 and 10 percent which allows a thinner gauge material to be used in forming the closures. Other than the three reversing arcuate segments the closure formed in accordance with the present invention conforms very closely to standard dimensional characteristics allowing its use on existing customers' fill-and-seal equipment without modification. An additional advantage of the present invention is that it can be easily instituted on many of the existing closure production lines with minor modifications and extremely low additional press tonnage requirements.

IPC 1-7

B21D 51/26; B21D 51/44

IPC 8 full level

B21D 51/38 (2006.01); B21D 51/44 (2006.01); B65D 8/08 (2006.01)

CPC (source: EP)

B21D 51/383 (2013.01); B65D 17/08 (2013.01)

Citation (search report)

[AD] US 3441170 A 19690429 - KHOURY NICK S
[AD] US 3774801 A 19731127 - GEDDE E
[AD] US 4217843 A 19800819 - KRASKA JOHN L [US]
[A] US 4093102 A 19780606 - KRASKA JOHN L
[A] GB 2051646 A 19810121 - CONTINENTAL GROUP
[A] DE 2532194 A1 19760205 - CONTINENTAL CAN CO
[A] DE 2820514 A1 19781123 - FEREMBAL SA

Designated contracting state (EPC)

AT BE CH DE FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0103074 A2 19840321; EP 0103074 A3 19840523; AU 1618683 A 19840315; JP S5962444 A 19840409

DOCDB simple family (application)

EP 83105729 A 19830610; AU 1618683 A 19830623; JP 16530083 A 19830909