Metallic beverage can end with improved chuck wall and countersink

A container end closure, comprising:

• a circular end wall adapted for interconnection to a side wall of a container;
• a non-linear chuck wall integrally interconnected to said circular end wall and extending downwardly, said chuck wall comprising an outwardly extending arch having a radius of curvature between about 0.170 inches and 0.300 inches and a non-linear upper chuck wall portion positioned above said outwardly extending arch with a radius of curvature between about 0.070 and 0.090 inches;
• a countersink interconnected on a first end to a lower portion of said chuck wall and on a second end to a lower portion of an inner panel wall and having a radius of curvature less than about 0.0 15 inches, wherein said lower portion of said chuck wall extends substantially to a non-linear portion of said countersink;
• and
• a central panel interconnected to an upper end of said inner panel wall and raised above a lowermost portion of said countersink no greater than about 0.090 inches, said central panel positioned above said lower portion of said chuckwall.

A metallic container end closure adapted for interconnection to a container body, comprising:

• a peripheral end wall adapted for interconnection to a side wall of the container body;
• an upper chuck wall portion integrally interconnected to said peripheral end wall and having a radius of curvature of at least about 0.070 inches;
• an inwardly projecting arch integrally interconnected to said upper chuck wall and having a radius of curvature of at least about 0.015 inches;
• a lower chuck wall portion integrally interconnected to said inwardly projecting arch and having a radius of curvature of at least about 0.150 inches;
• a countersink integrally interconnected to said lower chuck wall portion on a first end and a lower end of an inner panel wall on a second end, said inner panel wall extending upwardly and comprising a lower portion oriented at a first angle and an upper portion oriented at a second angle which is distinct from said second angle;
• and
• a central panel interconnected to an upper end of said inner panel wall, said central panel positioned above a lowermost portion of said countersink a distance no greater than about 0.090 inches.