Base for metallic container
View Patent ↗An improved metallic can has an integral base that defines a standing ring that is more resistant to buckling than conventional designs. It includes a vertically oriented cylindrical sidewall and a unitary end wall having a recessed central portion and a downwardly flanged rim portion that defines the standing ring. The downwardly flanged rim portion preferably includes a first outer convexly curved annular surface that when viewed in vertical cross-section has a first radius of curvature R 1 , a second, lower convexly curved annular surface that when viewed in vertical cross-section has a second radius of curvature R 2 , and a third, inner convexly curved annular surface that when viewed in vertical cross-section has a third radius of curvature R 3 . Advantageously, the first, second and third radii of curvature R 1 , R 2 and R 3 are each different from each other.
1. A metallic can, comprising:
a vertically oriented cylindrical sidewall;
an end wall that is unitary with said cylindrical sidewall, said end wall comprising a recessed central portion and a downwardly flanged rim portion that defines a substantially circular standing ring, and where said downwardly flanged rim portion comprises;
a first outer convexly curved annular surface that when viewed in vertical cross-section has a first radius of curvature R 1 ;
a second, lower convexly curved annular surface that when viewed in vertical cross-section has a second radius of curvature R 2 ;
a third, inner convexly curved annular surface that when viewed in vertical cross-section has a third radius of curvature R 3 ; and
wherein said first, second and third radii of curvature R 1 , R 2 and R 3 are each different from each other; wherein said third radius of curvature R 3 is greater than said second radius of curvature R 2 , wherein said second radius of curvature R 2 is greater than said first radius of curvature R 1 .
2. A metallic can according to claim 1 , wherein said third radius of curvature R 3 is greater than said first radius of curvature R 1 .
3. A metallic can according to claim 1 , wherein said first radius of curvature R 1 subtends a first angle that is within a range of about 5° to about 80°.
4. A metallic can according to claim 1 , wherein said second radius of curvature R 2 subtends a second angle that is within a range of about 5° to about 50°.
5. A metallic can according to claim 1 , wherein said third radius of curvature R 3 subtends a third angle that is within a range of about 5° to about 80°.
6. A metallic can according to claim 1 , wherein an innermost end of said third, inner convexly curved annular surface extends at an angle with respect to a horizontal plane that is within a range of about 50° to about 90°.
7. A metallic can according to claim 1 , wherein said is substantially circular standing ring has a diameter that is within a range of about 1.2 inches to about 2.0 inches.
8. A metallic can according to claim 1 , wherein said first radius of curvature R 1 is within a range of about 0.015 inches to about 0.090 inches.
9. A metallic can according to claim 8 , wherein said first radius of curvature R 1 is within range of about 0.025 inches to about 0.070 inches.
10. A metallic can according to claim 1 , wherein said second radius of curvature R 2 is within a range of about 0.015 inches to about 0.080 inches.
11. A metallic can according to claim 10 , wherein said second radius of curvature R 2 is within a range of about 0.025 inches to about 0.065 inches.
12. A metallic can according to claim 1 , wherein said third radius of curvature R 3 is within a range of about 0.015 inches to about 0.090 inches.
13. A metallic can according to claim 12 , wherein said third radius of curvature R 3 is within a range of about 0.025 inches to about 0.070 inches.