Can Shell and Double-Seamed Can End Closure

摘要

A drawn aluminum can shell has a peripheral crown which is double-seamed with an end portion of an aluminum can body to provide a can end having a generally flat center panel connected by an inclined curved or straight panel wall to an inner wall of an annular U-shaped countersink. The countersink has an outer wall which connects with a lower wall portion of a chuck wall, and the chuck wall has an upper wall portion which connects with an inner wall of the crown. The chuck wall also has an intermediate wall portion forming a break, and the inner bottom width of the countersink is less than the radial width of the panel wall.

主权项

1. A one-piece sheet metal end closure having a vertical center axis and a curled peripheral crown adapted to be double-seamed to a container body, the end closure further comprising:
a circular center panel connected by a panel wall to an inner wall portion of a countersink having an outer wall portion and a generally U-shaped cross-sectional configuration, a chuck wall having a lower wall portion connected to the outer wall portion of the countersink and an upper wall portion connected to an inner wall portion of the curled peripheral crown, the upper wall portion of the chuck wall forming an angular break with the lower wall portion of the chuck wall, the upper wall portion of the chuck wall having opposite end points defining in axial cross-section a first angle relative to the vertical center axis that is greater than a second angle relative to the vertical center axis that is defined by opposite end points of the lower wall portion of the chuck wall in axial cross-section, the inner wall portion of the curled peripheral crown forming an angular junction with the upper wall portion of the chuck wall and extending from the junction at a third angle relative to the vertical center axis that is less than the first angle in axial cross-section, and at least a portion of the upper wall portion of the chuck wall projecting above the circular center panel, and the upper wall portion of the chuck wall having a horizontal radial width defined between the angular junction and the angular break which is greater than a horizontal radial width of the countersink adjacent a bottom of the countersink and defined between the inner and outer wall portions of the countersink.