Patent ID: 7469795

Claim:
A closure suitable for attachment to a container having an end portion having a free end defining an opening of the container, the closure comprising: a top portion; a skirt portion depending from the top portion to an end distal the top portion, said top portion and skirt portion defining a cavity; a support ring which is hingedly connected to said skirt portion; a first sealing portion depending from the top portion and having a cylindrical inner surface; and a second sealing portion separated from the top portion by the inner surface of the first portion and which, prior to attachment of the closure to the container, extends at least inwardly into said cavity for a length to a free edge positioned inwardly of the skirt portion; wherein the length of the second portion is such that, during attachment of the closure with the end portion of the container, the end portion of the container contacts the second portion and pushes it upwardly and at least towards the first sealing portion of the closure to form a seal between the end portion of the container and the closure; wherein the support ring comprises a generally cylindrical body portion and a rib extending inwardly from an inner surface of the body portion that provides a lip having an inner free edge to engage under a retaining flange extending outwardly from the end portion of the container but spaced a distance from the free end thereof; wherein an undercut is formed on the inner surface of the support ring above the rib, the undercut providing an abutment surface and defining an upper extremity of a region of the body portion that is thinner than the body portion immediately above and below that region; and wherein the abutment surface provided by the undercut is substantially at a right angle to the inner surface of the support ring and bears on the upper surface of the retaining flange of the container on relatively downward movement of the support ring on the end portion and so resists that downward movement.