Annular lock

Claim 1

An annular lock stopper for closing an aperture of a bottle having a neck with an inner wall, an upper edge which delimits the aperture, and an outer recess (8) situated below said upper edge on an outer wall, the annular lock stopper comprising: a stopper part comprising: a central stem (4) for insertion into the neck of the bottle, said central stem having an outer wall with sealing rings (3) for providing sealing between the outer wall and the inner wall of the neck of the bottle; an upper part, fixed to said central stem (4), said upper part including a cap part (9) comprising an abutment surface for abutting against the upper edge of the bottle when said stopper part is in an inserted position in which said central stem (4) is disposed inside the neck of the bottle; and an outer part, depending from said upper part and arranged to embrace the outer surface of the neck of the bottle when said stopper part is in the inserted position, said outer part having a lower end portion comprising a widening arranged to fit into the outer recess (8) of the neck of the bottle when said stopper part is in said inserted position; and a ring part (6) attached to said stopper part by frangible connection means (7) disposed between a lower portion of said ring part and an upper portion of said stopper part, said ring part having an inner diameter such that, once said stopper part is in the inserted position and once said frangible connection means is broken, said ring part is displaceable in a first direction to a closed position in which said ring part surrounds and embraces the outer part of said stopper part, said ring part having a lower inner flange (2) disposed below the lower end portion of said outer part of said stopper part in the closed position, in order to block said ring part so as to prevent accidental displacement of said ring part from the closed position.