Stopper for a container

Abstract

A stopper for a container with a lid with a peripheral wall, which engages around the neck of the container and integrally formed on whose lower edge there is a peripheral security ring, which may be torn off, for tamper-evident security with inwardly directed locking formations, which, in the fastened position of the stopper, engage beneath an outwardly directed annular projection on the container, and with an olive provided with an outer, peripheral annular bead for gripping engagement in the container opening includes a circular, concentric recessed channel in the lid, which has a radially outer annular wall and a radially inner annular wall, which are connected together by a base wall, that the radially outward annular wall defines the olive and that formed directly above the locking formations there are openings, which pass through the security ring and which extend on both sides beyond the locking formations.

1 . A stopper for a container with a lid with a peripheral wall, which engages around the neck of the container and integrally formed on whose lower edge there is a peripheral security ring, which may be torn off, for tamper-evident security of the contents of the container with inwardly directed locking formations, which, in the fastened position of the stopper, engage beneath an outwardly directed annular projection on the container, and with an olive, which is provided with an outer peripheral annular bead, for gripping engagement in the container opening, the stopper comprising a circular, concentric recessed channel in the lid, which has a radially outer annular wall and a radially inner annular wall, which are connected together by a base wall, that the recessed channel is integrally formed on the central circular lid region and the outer annular lid region, that the radially outer annular wall defines the olive and that the upper side of the annular lid region is provided with at least one upwardly projecting rib. 
     
     
         2 . A stopper as claimed in  claim 1 , wherein the radially inner annular wall is extended beyond the base wall and defines the peripheral wall of a desiccant chamber. 
     
     
         3 . A stopper as claimed in  claim 1 , wherein a lower end region of the olive is bevelled linearly. 
     
     
         4 . A stopper as claimed in  claim 1 , wherein the olive has a ribbed wall surface on its inner side, which is defined by a plurality of grooves in the wall of the olive extending in the longitudinal direction of the olive. 
     
     
         5 . A stopper as claimed in  claim 4 , wherein the grooves have a generally constant depth of 10% to 50% of the minimum wall thickness of the olive. 
     
     
         6 . A stopper as claimed in  claim 4 , wherein the webs between the grooves have a domed cross-sectional shape. 
     
     
         7 . A stopper as claimed in  claim 1 , wherein a spiral retaining device is integrally formed on the base wall of the recessed channel.