Aluminum Company of America

Gary L Myers

Hans H Diekhoff

Andrew B Trageser

A drawn container is disclosed having a substantially cylindrical sidewall extending upwardly from an integral base portion to form an open neck which is double seamed with a top end closure. The base portion has a downwardly extending, generally U-shaped, circumferential nose portion, the outside surface of which defines the plane of the base of the container on which the container normally sets. The nose portion is defined by a radius between a substantially vertical inner wall and an outside wall. The outside wall extends from a lower portion of the sidewall through a convex lower body radius to a concave profile radius disposed above the nose portion. A frustoconical portion is provided between the convex lower body radius and the concave profile radius. The frustoconical portion forms a lower body angle of at least 30.degree. with respect to the plane of the base of the container. An inwardly directed bottom dome extends inwardly of the inner wall and has at least three progressively increasing radii of curvature in the direction of the center of the dome. A method is also disclosed for reforming the base portion of the above-described container. This method includes the steps of holding the substantially vertical disposition and the diameter of the inner wall defining the nose portion while simultaneously moving a reforming tool against the outside wall of the nose portion to tighten the nose radius therebetween and form the concave profile radius of the base portion while retaining a lower body angle greater than 30.degree., and retaining the progressively increasing radii of curvature in the bottom dome.

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Natrona Heights, PA, United States of America

Gary L Myers