Tamper proof bottle cap - stopper sealing ring remaining locked on bottle neck with screw cap removed

摘要

A screw cap for a bottle has a screw thread on outer surface of cylindrical part of its neck and corresponding screw thread on inner surface of the stopper cap engaging the outer thread on bottle neck. Attached to bottom part of the cap along circumferential break-line is a downwards projecting ring part which seals the stopper against the bottle neck and which remains in position when the cap is separated along the break-line by unscrewing it from bottle neck. The ring part is held in position during removal of the cap by a tooth shaped projection on its inner surface positioned parallel with the bottle axis and engaging one of corresponding tooth shaped projections circumferentially spaced on outer surface of bottle neck.