Can shell and double-seamed can end

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, said inner wall of said countersink extending at an angle greater than 10° relative to said center axis, 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 16° relative to said center axis, said chuckwall having an inclined lower portion connected to said outer wall of said countersink at a junction disposed substantially below the level of said center panel, said crown having an inner wall connected to said upper wall portion of said chuckwall, said countersink having a radius of curvature substantially smaller than a radius of curvature of said curved panel wall, and the width of said countersink at the bottom of said countersink between said inner and outer walls of said countersink being less than said radius of curvature of said panel wall and less than 0.040 inch.

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 U-shaped cross-section, a generally frusto-conical chuckwall including an upper wall portion extending at an angle greater than 16° relative to said center axis and having an inclined lower wall portion connected to an outer wall of said countersink at a first junction, said crown having an inner wall connected to said upper wall portion of said chuckwall at a second junction, said countersink having a radius of curvature substantially smaller than a radius of curvature of said curved panel wall, said first junction being spaced below the level of said center panel, and the axial distance from said center panel to the bottom of said countersink being less than the axial distance from said center panel to the top of said crown.

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 an outer wall extending at an angle less than 10° and a U-shaped cross-sectional configuration, said inner wall of said countersink extending at an angle greater than 10° relative to said center axis, a generally frusto-conical chuckwall extending from said outer wall of said countersink and having an inclined wall portion extending at an angle of at least 16° relative to said center axis, said chuckwall connected to said outer wall of said countersink at a junction disposed substantially below the level of said center panel, said crown having an inner wall connected to said inclined wall portion of said chuckwall, said countersink having a radius of curvature substantially smaller than a radius of curvature of said curved panel wall, and the width of said countersink at the bottom of said countersink between said inner and outer walls of said countersink being less than said radius of curvature of said panel wall and less than 0.040 inch.