Shutoff system for a container

Abstract

Said closure system comprises a neck element intended to be fastened on the receptacle and comprising a neck portion provided with a retaining collar; a closure cap intended to be removably fastened on the neck portion, the closure cap including a closure wall and a fastening skirt; and a tamper-proof ring connected to the fastening skirt by a plurality of frangible elements, the tamper-proof ring comprising at least one flexible retaining element. The neck portion and the tamper-proof ring are configured such that, in use, the retaining collar defines an annular hooking housing in which the at least one flexible retaining element is adapted to be at least partially received.

1 . A closure system for a receptacle, comprising:
 a neck element intended to be fastened on the receptacle, the neck element comprising a neck portion provided with a retaining collar which is flexible,   a closure cap intended to be screwed on the neck portion, the closure cap including a closure wall and a fastening skirt, and   a tamper-proof ring connected to the fastening skirt by a plurality of frangible elements, the tamper-proof ring comprising at least one flexible retaining element   the neck portion and the tamper-proof ring being configured such that, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, the retaining collar defines an annular hooking housing, and the at least one flexible retaining element is configured to be at least partially received and be hooked into the annular hooking housing,   characterized in that the retaining collar is configured to extend at least partially between the fastening skirt and the tamper-proof ring during the first screwing back of the closure cap on the neck portion after breakage of the frangible elements.   
     
     
         2 . The closure system according to  claim 1 , wherein the retaining collar is deformable between an initial position in which the retaining collar extends substantially radially relative to an extension axis of the neck portion, and a retaining position in which the retaining collar is curved and delimits the annular hooking housing. 
     
     
         3 . The closure system according to  claim 2 , wherein the tamper-proof ring is configured to deform and hold the retaining collar in its retaining position at least until the breakage of the frangible elements. 
     
     
         4 . The closure system according to  claim 1 , wherein the tamper-proof ring is configured to extend around the retaining collar. 
     
     
         5 . The closure system according to  claim 1 , wherein the peripheral edge of the retaining collar delimits, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, an insertion opening emerging in the annular hooking housing, the at least one flexible retaining element being configured to extend through the insertion opening. 
     
     
         6 . The closure system according to  claim 1 , wherein the tamper-proof ring comprises an annular portion connected to the fastening skirt by the frangible elements, the retaining collar having an outer diameter larger than the inner diameter of the annular portion. 
     
     
         7 . The closure system according to  claim 1 , wherein the retaining collar is configured to exert, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, a radial force against the tamper-proof ring. 
     
     
         8 . The closure system according to  claim 1 , wherein the tamper-proof ring comprises at least one first drive element extending towards the fastening skirt, and the closure cap comprises at least one second drive element extending towards the tamper-proof ring, the at least one second drive element being configured to cooperate with the at least one first drive element, during the first screwing back of the closure cap on the neck portion after breakage of the frangible elements, so as to displace the tamper-proof ring away from the fastening skirt and to form at least one opening check space between the fastening skirt and the tamper-proof ring. 
     
     
         9 . The closure system according to  claim 8 , wherein the at least one first drive element comprises a first cam surface, and the at least one second drive element comprises a second cam surface configured to cooperate with the first cam surface so as to bias, during the first screwing back of the closure cap on the neck portion after breakage of the frangible elements, the tamper-proof ring away from the fastening skirt. 
     
     
         10 . The closure system according to  claim 1 , wherein the neck portion includes an annular stop element against which the at least one flexible retaining element is configured to abut during the first unscrewing of the closure cap. 
     
     
         11 . The closure system according to  claim 10 , wherein the annular stop element is configured to extend into the annular hooking housing. 
     
     
         12 . The closure system according to  claim 2 , wherein the tamper-proof ring is configured to extend around the retaining collar. 
     
     
         13 . The closure system according to  claim 3 , wherein the tamper-proof ring is configured to extend around the retaining collar. 
     
     
         14 . The closure system according to  claim 2 , wherein the peripheral edge of the retaining collar delimits, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, an insertion opening emerging in the annular hooking housing, the at least one flexible retaining element being configured to extend through the insertion opening. 
     
     
         15 . The closure system according to  claim 3 , wherein the peripheral edge of the retaining collar delimits, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, an insertion opening emerging in the annular hooking housing, the at least one flexible retaining element being configured to extend through the insertion opening. 
     
     
         16 . The closure system according to  claim 4 , wherein the peripheral edge of the retaining collar delimits, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, an insertion opening emerging in the annular hooking housing, the at least one flexible retaining element being configured to extend through the insertion opening. 
     
     
         17 . The closure system according to  claim 2 , wherein the tamper-proof ring comprises an annular portion connected to the fastening skirt by the frangible elements, the retaining collar having an outer diameter larger than the inner diameter of the annular portion. 
     
     
         18 . The closure system according to  claim 3 , wherein the tamper-proof ring comprises an annular portion connected to the fastening skirt by the frangible elements, the retaining collar having an outer diameter larger than the inner diameter of the annular portion. 
     
     
         19 . The closure system according to  claim 2 , wherein the retaining collar is configured to exert, when the closure cap is fastened on the neck portion and at least until a breakage of the frangible elements, a radial force against the tamper-proof ring. 
     
     
         20 . The closure system according to  claim 2 , wherein the tamper-proof ring comprises at least one first drive element extending towards the fastening skirt, and the closure cap comprises at least one second drive element extending towards the tamper-proof ring, the at least one second drive element being configured to cooperate with the at least one first drive element, during the first screwing back of the closure cap on the neck portion after breakage of the frangible elements, so as to displace the tamper-proof ring away from the fastening skirt and to form at least one opening check space between the fastening skirt and the tamper-proof ring.