Patent ID: 7500376

Claim:
A method for forming a predetermined shape in a metallic container end closure adapted for interconnection to a neck of a container, comprising: positioning a metallic end closure blank in a forming press; providing a clamping force on at least a portion of a seaming panel between a first tool and a second tool, said at least a portion of a seaming panel being oriented in a first substantially horizontal direction; providing a clamping force on at least a portion of a central panel between a third tool and a fourth tool to substantially prevent movement of the central panel; while the clamping force is provided on the at least a portion of the central panel, supporting at least a portion of a chuck wall and an inner seaming panel radius on both an interior surface and an exterior surface to substantially prevent movement of at least a portion of the chuck wall and inner seaming panel radius, wherein said inner seaming panel radius is supported along its cross-sectional radius of curvature that begins proximate to a first point of divergence from said first substantially horizontal direction of said seaming panel; supporting a first portion of the countersink with at least one of said third tool and said fourth tool while an exterior portion of the countersink is unsupported with any tools; and providing a compressive force on a lower portion of the countersink while retaining the chuck wall in a preferred position, wherein the end closure is formed into a predetermined shape.