Patent ID: 8235704

Claim:
A base assembly for forming a container with a base having a moveable region and a bearing surface, comprising: a base pedestal; a base plug coupled to said base pedestal, said base plug having a base mold adapted to form the moveable region and the bearing surface of the container base so that a first portion of the moveable region protrudes outward from the base beyond the bearing surface in a first position of said base mold before activation thereof to move the moveable region inwardly, and so that a second portion of the moveable region does not project beyond the bearing surface in the first position of said base mold before activation thereof, said base mold having: a bearing surface forming portion to form a portion of the bearing surface of the container base; a cavity portion to form the first portion of the moveable region protruding outward from the base beyond the bearing surface, said cavity portion being below said bearing surface forming portion in cross section view and circumscribed by said bearing surface forming portion in plan view; and a moveable portion to form the second portion of the moveable region which does not project beyond the bearing surface in the first position, said moveable portion being arranged at a central longitudinal axis of said base mold and being above said bearing surface forming portion in cross section view, wherein, during activation said moveable portion is constructed and operative to move relative to said bearing surface forming portion and said cavity portion.