VENTED SNAP-ON, SCREW-OFF CAP AND CONTAINER NECK

摘要

A tamper-evident closure (21) is used with a container neck (22). The neck (22) has first helical thread on an upper neck stretch portion and external ratchet teeth (51, 81) on a locking wall portion below the upper neck stretch portion. The closure (21) has an upper skirt (64) having second helical thread mating with the first helical thread. A downward extending lower skirt portion (63) includes an outer skirt portion and a shoulder extending inwardly from the outer skirt portion. A frangible section (87) interconnects the shoulder and the upper skirt portion. Fins (100) are formed upstanding from the shoulder (73) preventing upward deformation of the lower skirt portion (63) without breaking the frangible section (87), the lower skirt portion (63) has internal ratchet teeth and is formed with a line of weakness (87) extending through the outer skirt portion and the shoulder. The lower skirt (63) has a tear tab (86) which, when pulled fractures the lower skirt (63) on a vertical line.