Abstract: A process for manufacturing a closing device constituted by a tapped closing device and a tamper-proof ring inlcuding, on the one hand, an annular joining strip with controlled deformation and, on the other hand, an inner annular projection. A preforming of the tamper-proof ring is effected:by axially introducing in said device a cylindrical mandrel which is provided with an annular peripheral cam such that the lower face of the inner annular projection comes into abutment against said cam, thenby exerting on said device and/or on the mandrel a bearing effort whose force is sufficient to ensure a relative stroke of the mandrel in the device in contact with the cam up to a preforming position maintained for a determined time so as jointly to produce an outward bending of the strip with controlled deformation and a remanent deflection towards the closing device of the inner annular projection so that its upper face remains inclined by an angle with respect to the normal to the axis of the device.

Abstract: A closure device for a recipient with a threaded neck. It includes a tapped closure having a lower part attached to a guarantee strip by a zone of connection of low mechanical resistance, the strip presenting an elastically-deformable, inner, annular bead adapted to clip beneath a holding flange formed on a lower periphery of the neck by forced screwing of the closure; and an outer peripheral boss axially separated from the bead by a zone of controlled elastic deformation, an upper face of the boss and a lower edge of a lateral wall of the closure having formed therein, respectively, at least one tooth and at least one notch, the tooth being intended to be temporarily received in the notch during screwing when the bead is in abutment with the holding flange in order to avoid any relative rotational displacement of the closure with respect to the strip and to ensure clipping without deteriorating the zone of connection.

Abstract: The closure device provided for a container ending in a neck is of the type comprising a cap (1) with a lid (5) which is hinged thereon.With a view to facilitating the molding operation of the cap and the lid thereof in one single piece, the hinge (6) is a double hinge having a few millimeter width.

Abstract: Cover for a vessel aperture manufactured in one piece notably through the casting of a plastic material, comprising in part a channeled frame adapted to be sealed or otherwise attached to the outer edges of a vessel aperture, a cover adapted to fit into the frame in closed position, the frame and cover being connected by a zone of liaison constituting a hinge and formed in a single piece interdependent with the frame and cover from the time they were cast with the cover piece in the open position.