Patent ID: 6516968
Filing Date: 2003-02-11
Classification: B21D,B65D

Abstract:
A sheet metal can shell having a vertical center axis and a curled peripheral crown adapted to be double-seamed to an end portion of a formed sheet metal can body, said shell comprising a circular center panel connected by a curved panel wall to an inner wall of a countersink having a generally cylindrical outer wall and a U-shaped cross-sectional configuration, a generally frusto-conical chuckwall extending from said outer wall of said countersink and having an inclined upper wall portion extending at an angle of at least 16Â° relative to said center axis and an inclined lower wall portion extending at an angle less than said angle of said upper wall portion, said chuckwall further having a generally vertical short riser wall portion connecting said lower wall portion to said upper wall portion, said crown having an inner wall connected to said chuckwall, said countersink having a radius of curvature substantially smaller than a radius of curvature of said curved panel wall, and said countersink having a width at the bottom of said countersink between said inner and outer walls of said countersink less than said radius of curvature of said panel wall.