Patent ID: 11970324
Assignee: ENVASES USA, INC.
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A plastic container adapted for vacuum absorption, the container comprising a base and a container body extending up from the base along a central axis to a finish portion defining a mouth, the base including
an outside wall;
a chime connecting the outside wall to an annular contact ring;
an inner wall extending upward from the contact ring to a hinge; and
a diaphragm connected to the hinge, the diaphragm movable between a first position and a second position in response to pressure change within the plastic container, the diaphragm having a central region connected to an annular flexible wall around the central region, the annular flexible wall in the first position having a profile as viewed in cross section that curves concavely inward and downward, with respect to an outside of the container, from the hinge to the central region, wherein at least a radially outer portion of the central region protrudes downward;
wherein the annular flexible wall includes a first annular portion having a first radius of curvature and a second annular portion having a second radius of curvature less than the first radius of curvature, wherein the second annular portion is radially between the first annular portion and the central portion and connects the first annular portion to the central region;
wherein the second radius of curvature is in a range from 0.15 to 0.25 inch and the first radius of curvature is in a range from 1.0-1.5 inches when the diaphragm is in the first position; and
wherein the second radius of curvature is maintained in the range from 0.15 to 0.25 inch when the diaphragm moves from the first position to the second position, and wherein the first radius of curvature is reduced when the diaphragm moves to the second position.