| 摘要 |
<p>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 (12) and a unitary end wall (14) having a recessed central portion (16) and a downwardly flanged rim portion (18).that defines the standing ring (20). 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 R1, a second, lower convexly curved annular surface that when viewed in vertical cross-section has a second radius of curvature R2, and a third, inner convexly curved annular surface that when viewed in vertical cross-section has a third radius of curvature R3. Advantageously, the first, second and third radii of curvature R1, R2 and R3 are each different from each other.</p> |
