Patent ID: 8485373

Claim:
A stopper device for stopping a container neck, said stopper device comprising: a base that is substantially tubular and that is adapted to be fastened around the neck; a lid that is substantially tubular and that is carried movably by the base between a closed position, in which the lid closes off the base in a leaktight manner by covering it in part, and an open position, in which the lid is spaced apart from the base so as to enable a flow to pass through the base, the lid configured to be moved away from the neck when it leaves the closed position to go into the open position; and tamper-proofing means suitable for indicating visually whether the lid has already been pivoted from the closed position towards the open position, said tamper-proofing means comprising: a breakable strand that, prior to breaking, extends lengthwise in a longitudinal direction which is along the periphery of a first portion of either the lid or the base, wherein the strand includes two longitudinal ends, which are opposed to each other in the longitudinal direction, and a main portion which prior to breaking of the strand, couples the two longitudinal ends to each other in the longitudinal direction, wherein at least one of the two longitudinal ends of the strand is connected permanently to the first portion; and a stud that is connected permanently to a second portion of the base or the lid and that projects outwards from said second portion, the stud being adapted to press against at least the main portion of the strand such that the stud is configured to break the strand at a break zone along the strand when the lid is moved for the first time from the closed position to the open position, and wherein the stud is interposed, along the periphery of the first portion, between two edges of said break zone when the lid is put back into the closed position.