Variable displacement container base

Abstract

Base includes an outer support wall, a support surface extending inwardly from the outer support wall and defining a reference plane, an inner support wall extending upwardly from the support surface, a first radiused portion extending radially inward from the inner support wall and concave relative to the reference plane, a second radiused portion extending radially inward from the first radiused portion and convex relative to the reference plane, an intermediate surface extending radially inward from the second radiused portion, the intermediate surface including a linear portion and an intermediate radiused portion, a third radiused portion extending radially inward from the intermediate surface and convex relative to the reference plane, and a central portion disposed proximate the third radiused portion.

1 . A blow-molded container adapted for filling with a heated liquid, the container including a central longitudinal axis and a base, the base comprising:
 a support surface defining a horizontal reference plane;   a sidewall having a plurality of horizontally displaced annular ribs;   an inner support wall extending upwardly from the support surface;   a first radiused portion extending radially inward toward the central longitudinal axis from the inner support wall and concave relative to the reference plane;   a second radiused portion extending radially inward toward the longitudinal axis from the first radiused portion and convex relative to the reference plane;   an intermediate surface extending radially inward toward the longitudinal axis from the second radiused portion, wherein the intermediate surface comprises an intermediate radiused portion concave relative to the reference plane;   a third radiused portion extending radially inward toward the longitudinal axis from the intermediate surface and convex relative to the reference plane;   a transition portion extending radially inward toward the longitudinal axis from the third radiused portion and being concave relative to the reference plane; and   a central portion disposed proximate the third radiused portion.   
     
     
         2 . A blow-molded container adapted for filling with a heated liquid, the container including a central longitudinal axis and a base, the base comprising:
 a support surface defining a horizontal reference plane;   a sidewall having a plurality of horizontally displaced annular ribs;   an inner support wall extending upwardly from the support surface;   a first radiused portion extending radially inward toward the central longitudinal axis from the inner support wall and concave relative to the reference plane;   a second radiused portion extending radially inward toward the longitudinal axis from the first radiused portion and convex relative to the reference plane;   an intermediate surface extending radially inward toward the longitudinal axis from the second radiused portion, wherein the intermediate surface comprises an intermediate radiused portion concave relative to the reference plane and a linear portion extending radially from the second radiused portion to the intermediate radiused portion;   a third radiused portion extending radially inward toward the longitudinal axis from the intermediate surface and convex relative to the reference plane;   a transition portion extending radially inward toward the longitudinal axis from the third radiused portion and being concave relative to the reference plane; and   a central portion disposed proximate the third radiused portion, the central portion including an inner core having a core sidewall and a top surface extending from the core sidewall, the top surface having a convex portion relative the reference plane.