TAMPER EVIDENT CLOSURE

摘要

A tamper evident closure for a container having an externally threaded neck. The tamper evident features provide visual evidence that the container has been opened. A thermoplastic closure of the type having an annular internally threaded skirt; an annular skirt extension (3) permanently attached to the skirt adjacent the skirt's lower extremity; one or more discrete arcuate sectors of the skirt extension (3) being configured as flaps (4) permanently affixed to the main body of the skirt extension at a first end (5) being the trailing end during the unscrewing operation and frangibly connected to the main body of the extension at a second end being the leading end of the flap during the unscrewing operation; a container engaging tooth (8) extending towards the container from each flap adjacent its second end; a hinge (11) on each flap intermediate its first end and the container engaging tooth (8); the container engaging tooth being adapted to override a trigger tooth (9) adjacent a container neck (10) during the running up of the closure onto the container but to lock against the trigger tooth (9) during the unscrewing operation; such locking adapted to break the frangible connection (7) between the main body of the skirt extension (3) and the second end of the flap; the container engaging tooth (8) and second end of the flap being adapted upon further unscrewing of the closure to fold inwardly about the hinge (11) and towards the first end of the flap to a tamper evident position radially inward of the non-folded portion of the flap.