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US 6,634,517 B2Granted
Base for plastic container
AssigneeCrown Cork & Seal Technologies Corporation
InventorsJ. John Cheng, XiaoXu Yuan
Life of this patent
Estimating the term…
Abstract
A molded polymeric container includes a body portion having a sidewall and an integral champagne type base. The base includes a lower end that defines an annular contact ring for supporting the container with respect to an underlying surface. An annular step ring is defined immediately radially inwardly of the annular contact ring and has a radial length LS. The base further has a central push-up area and a generally concave transition region interposed between the central push-up area and the annular contact ring. The transition region further includes a plurality of integrally molded radially extending ribs, each of the ribs having a length LR. According to one advantageous aspect of the invention, the ratio LR/LS is within a range of about 1.0 to about 4.0.
Claims33
A molded polymeric container, comprising:
- a body portion having a sidewall;
- and
- a champagne type base portion that is molded integrally with said sidewall, said champagne type base portion comprising
- a lower end that defines an annular contact ring for supporting the container with respect to an underlying surface;
- an annular step ring defined immediately radially inwardly of said annular contact ring, said annular step ring including at least one top step and at least one bottom step, said annular step ring further having an inner radius, an outer radius and a radial length Lsrepresenting a distance between said inner and outer radii;
- a central push-up area;
- a generally concave transition region interposed between said central push-up area and said annular contact ring, said transition region further comprising a plurality of integrally molded radially extending ribs that are located radially inwardly of said inner radius of said annular step ring, each of said ribs having a length LR;
- and wherein
- the ratio of said length LR of said radially extending ribs divided by said radial length LS is within a range of-about 1.0 to about 4.0.
6 more elements
A molded polymeric container, comprising:
- a body portion having a sidewall;
- and
- a champagne type base portion that is molded integrally with said sidewall, said champagne type base portion comprising
- a lower end that defines an annular contact ring for supporting the container with respect
- to an underlying surface;
- an annular step ring defined immediately radially inwardly of said annular contact ring, said annular step ring having a radial length LS and a depth DS, and wherein said depth DS is within a range of about 0.2 to about 0.5 of the radial length LS of the annular step ring;
- a central push-up area;
- a generally concave transition region interposed between said central push-up area and said annular contact ring, said transition region further comprising a plurality of integrally molded radially extending ribs, each of said ribs having a length LR;
- and wherein
- the ratio of said length LR of said radially extending ribs divided by said radial length LS is within a range of about 1.0 to about 4.0.
7 more elements
A molded polymeric container, comprising:
- a body portion having a sidewall;
- and
- a champagne type base portion that is molded integrally with said sidewall, said champagne type base portion comprising
- a lower end that defines an annular contact ring for supporting the container with respect to an underlying surface;
- an annular step ring defined immediately radially inwardly of said annular contact ring, said annular step ring having a radial length LS;
- a central push-up area;
- a generally concave transition region interposed between said central push-up area and said annular contact ring, said transition region further comprising a plurality of integrally molded radially extending ribs, each of said ribs having a length LR, said generally concave transition region having a radius of curvature RRB, and wherein each of said radially extending ribs has a convex outer radius of curvature RRT, and wherein the ratio RRT/RRB is within a range of about 0.6 to about 1.0;
- and wherein
- the ratio of said length LR of said radially extending ribs divided by said radial length LS is within a range of about 1.0 to about 4.0.
6 more elements
A molded polymeric container, comprising:
- a body portion having a sidewall;
- and
- a champagne type base portion that is molded integrally with said sidewall, said champagne type base portion comprising
- a lower end that defines an annular contact ring for supporting the container with respect to an underlying surface;
- an annular step ring defined immediately radially inwardly of said annular contact ring, said annular step ring having a radial length LS,said annular step ring defining a concave circumferentially extending top step that has a radius of curvature RST, and a plurality of radially extending bottom steps, each of which has a convex radius of curvature RSB.
- a central push-up area;
- a generally concave transition region interposed between said central push-up area and said annular contact ring, said transition region further comprising a plurality of integrally molded radially extending ribs, each of said ribs having a length LR;
- and
- wherein the ratio of said length LR of said radially extending ribs divided by said radial length LS is within a range of about 1.0 to about 4.0.
6 more elements
A molded polymeric container, comprising:
- a body portion having a sidewall;
- and
- a champagne type base portion that is molded integrally with said sidewall, said champagne type base portion comprising
- a lower end that defines an annular contact ring for supporting the container with respect to an underlying surface;
- an annular step ring defined immediately radially inwardly of said annular contact ring, said annular step ring having a radial length LS;
- a central push-up area;
- a generally concave transition region interposed between said central push-up area and said annular contact ring, said transition region further comprising a plurality of integrally molded radially extending ribs, each of said ribs having a length LR;
- and wherein said base portion is shaped so that for any given radial cross-section one of said annular step ring and said transition region has a concave profile while the other of said annular step ring and transition region has a convex profile.
5 more elements
Dependencies are inferred from the claim text.