Abstract: An assembly device comprises an external element and an open-loop ring. The external element comprises a tubular part extending along an axis. The open-loop ring is elastically deformable between an open position and a closed position. The external element comprises an assembly part assemblable with the ring by elastic interlocking. The assembly part comprises recessed elements and/or projecting elements arranged on an internal wall of the tubular part. The ring comprises first assembly part assemblable with the external element by elastic interlocking when the ring is in the open position, and the second assembly part interlocking with the external element by elastic interlocking when the ring is in the closed position. Such elastic interlocking assembly device allows for the irreversible assembly of the external element with a container neck.

Abstract: An assembly device comprises an external element and an open-loop ring. The external element comprises a tubular part extending along an axis. The open-loop ring is elastically deformable between an open position and a closed position. The external element comprises an assembly part assemblable with the ring by elastic interlocking The assembly part comprises recessed elements and/or projecting elements arranged on an internal wall of the tubular part. The ring comprises first assembly part assemblable with the external element by elastic interlocking when the ring is in the open position, and the second assembly part interlocking with the external element by elastic interlocking when the ring is in the closed position. Such elastic interlocking assembly device allows for the irreversible assembly of the external element with a container neck.