초록 ▼

A plastic container comprises a lower base forming portion that includes a plurality of circumferentially spaced downwardly convex segments (126) and a plurality of intervening, circumferentially spaced, totally convex, hollow foot forming portions (121) that extend radially from the central bottom

A plastic container comprises a lower base forming portion that includes a plurality of circumferentially spaced downwardly convex segments (126) and a plurality of intervening, circumferentially spaced, totally convex, hollow foot forming portions (121) that extend radially from the central bottom portion (120) and downwardly from the downwardly convex segments to form a clearance (124) for the central bottom portion. The downwardly convex segments have smoothly curved cross sections, in radially extending planes through their central regions and coplanar with the container's longitudinal axis (120a). The clearance forming portion (123) of each foot forming portion includes a compound curved offset formed with opposing radii of curvature lying in a range of about 15% to over about 30% of foot contact diameter, the compound curved offset curving downwardly and outwardly about a center of curvature (131) below the bottom forming portion before curving about a center of curvature (130) above the bottom forming portion.

대표청구항 ▼

[ We claim:] [1.]1. A blow molded plastic container for carbonated beverages, comprising an upper mouth-forming portion, a cylindrical sidewall portion and a lower base-forming portion, all about a central longitudinal axis,said lower base-forming portion comprising a plurality of hollow foot-formin

[ We claim:] [1.]1. A blow molded plastic container for carbonated beverages, comprising an upper mouth-forming portion, a cylindrical sidewall portion and a lower base-forming portion, all about a central longitudinal axis,said lower base-forming portion comprising a plurality of hollow foot-forming portions extending outwardly from the central portion of the lower base-forming portion to form a plurality of feet lying substantially on a contact diameter, each foot-forming portion including between said central portion of the base-forming portion and its foot, a bottom clearance-forming portion including a compound-curved offset of a substantial fraction of an inch formed by opposing radii of curvature, said compound-curved offset curving downwardly from said central portion about a radius of curvature below the bottom of the base-forming portion before curving about a radius of curvature above the bottom of the base-forming portion, and further comprising a plurality of downwardly convex segments between adjacent pairs of hollow foot-forming portions, each of said downwardly convex segments extending upwardly between said adjacent hollow foot-forming portions, the downwardly convex segments having cross-sections, in a radially extending plane in its central portion coplanar with the longitudinal axis of the container, with a coefficient of curvature of from about 0.68 to about 0.75, and flaring outwardly to merge into said cylindrical sidewall portion at its upper end.