Method and apparatus for forming container end having annular pa

Details Method and apparatus for forming container end having annular pa Method and apparatus for forming container end having annular pa

1996-11-21

1998-02-17

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

723792, 72352, 413 8, B21D 2200, B21D 2221, B21C 3702

Patent

active

057181438

ABSTRACT:
A container end, including a die and the method for making, for pressurized containers includes a circular center panel, an inner annular panel around the center panel, and an outer annular panel around the inner annular panel. The inner annular panel has a generally arcuate cross-section viewed in a plane extending radially from the centerpoint of the container lid. The inner annular panel comprises a plurality of first segments, spaced apart about the circumference of the inner annular panel, and a plurality of second segments, with at least one second segment being positioned between adjacent pairs of first segments. The radius of curvature of the arcuate cross section of each of the first segments is less than the radius of curvature of the arcuate cross section of each of the second segments, so that the radius of curvature of the inner annular panel varies along the circumferential length of the inner annular panel.

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