US Patent 6851586 Closure device and container provided with same

A closure divice for a container including a pourer designed to be fixed on a neck of the container wherein the closure device includes a cover assembly adapted to be mounted on the neck and over the pourer. The cover assembly includes a cap movable between a first position wherein it closes the neck and the pourer from the outside and a second position where it allows access to the neck and to the pourer. The pourer is arranged at least partly inside the neck. The cap is provided with a skirt extending, in the first position of the cap, inside the neck. The skirt has at least one flange capable, when the cap is in the first position, of exerting a force urging the pourer against an edge of the neck.