Bottle stopper

Claim 1

A bottle stopper of the type having a substantially rigid plastics body and a seal, said body having a cap form with an internally threaded side wall and said seal being applied to the area of the edge of the body bottom and the side wall area adjacent said bottom, wherein the body bottom is provided with a concentric rib and between said rib and the side wall a plurality of recesses while the side wall is provided on the inner side thereof with an annular flange close to the bottom and between said flange and the bottom a plurality of hollows, said seal being comprised between said rib and said flange and filling said recesses and hollows, said side wall being integrally axially attached to a security member, the transition between said side wall to said security member being constituted by weakened means and by a reinforced portion, said security member having on the inside thereof an inwardly extending transverse peak adapted to engage an outwardly extending rib of the vessel, wherein said security member is provided with an aperture having a pointed portion adjacent said reinforced portion having the apex thereof extending away from the cap portion, said aperture being adjacent said side wall and wherein said security member has a thin portion centered relative to said pointed portion from which said inwardly extending transverse peak is missing, forming an ideal line of priority rupture beyond said apex.