Patent ID: 8308022
Filing Date: 2012-11-13
Classification: B65D

Abstract:
1. A stopper intended to be mounted on a container, an internal volume of which may contain contents capable of flowing, said stopper comprising: a base comprising mounting means for mounting on the container, the container having a neck sealable with respect to the contents of said container, and a discharge duct designed to communicate with an internal volume of said container in order to discharge the contents, comprising an outlet orifice for letting said contents out, a lid comprising shut-off means designed to close the outlet orifice of the base in a way that is sealed with respect to the contents of said container, articulation means for articulating the lid with respect to the base, between an open position in which the outlet orifice of the base is completely uncovered, and a flipped-down position in which said outlet orifice is closed, the articulation means including a spring-back hinge comprising a piece or web of viscoelastic material, which joins the lid and the base, the spring-back hinge being designed to be stressed when the lid is in a flipped-down position onto the base, and being designed to automatically urge the lid to spring back to the open position, retaining means for locking the lid on the base, in the flipped-down position, the retaining means being designed to require a predetermined unlatching force, exerted between said lid and the base, in order to disengage one from the other and free the hinge to automatically urge the lid to spring back to the open position, and positive unlatching means for unlatching the lid from the base, the unlatching means being designed to be actuated manually by exerting an opposing force between said base and said lid, the opposing force being at least equal to the unlatching force of the retaining means that holds the lid in the flipped-down position, wherein when the unlatching means is manually actuated, the hinge is designed to automatically urge the lid to spring back to the open position, wherein the unlatching means comprises: the base comprises two more or less parallel and oblique external wings that project outwardly and away from the base, each wing having a top edge and a side edge and the wings forming between them a protected volume within which the flap can pivot about an end formed into the base, the end opposing the free end, and wherein the side edge of each wing extends no farther in a radial direction than a corresponding edge of the flap based upon a diametrical cross section of the stopper extending through a center of the spring-back hinge.