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US 5,950,858 AGranted
Container end closure
OwnerDavid Robert Sergeantinventor
Life of this patent
Estimating the term…
Abstract
An end closure for a container has a central panel, a circumferential countersink (18) formed around the center panel and adjacent the periphery of the end closure, and a fold (22) formed at the junction between the countersink and the center panel, the fold having opposite side walls which lie closely adjacent or in contact with each other and project upwards from the end closure. The fold may instead be formed at the base of the countersink. The fold forms an annular rigid zone in the end closure.
Claims16
A sheet material end closure for a container, comprising:
- an end closure having a center panel;
- a circumferential countersink formed around said center panel, said countersink being in a form of a valley having opposite inner and outer side walls and an interconnecting bottom portion, with the inner side wall extending substantially vertically downwards from the center panel;
- and,
- an annular peripheral rim portion extending from, and disposed around, said circumferential countersink, said annular peripheral rim portion being at an extreme outer edge of said end closure and being curved in section and being of reduced thickness as compared with said center panel.
1 more element
A method for forming a container end closure, comprising the steps of:
- providing a sheet material end closure blank;
- punching said end closure blank through a die using a punch having a clearance, between itself and at least a portion of the die, of less than the thickness of said sheet material end closure blank, said end closure blank having a size greater than an opening through the die for forming a peripheral rim portion of said blank to a reduced thickness;
- forming a circumferential countersink in said end closure blank between a center panel and said peripheral rim portion;
- and,
- forming said peripheral rim portion to a curved section.
2 more elements
Dependencies are inferred from the claim text.