Improvements in screw-topped containers.

摘要

A bottle with a neck (1) has a child-resistant screw closure cap (13). In order to make the cap (13) child-resistant, the neck (1) is fitted with a collar (7) of U-shaped cross- section. The collar (7) is retained on the neck (1) by engagement of pawls (11) inside a portion (8) of the collar under a retaining ring (2) on the neck (1). The cap (13) is screwed onto the part (8) of the collar and to allow this to be done, the collar (7) is prevented from rotating on the neck (1) by engagement of the pawls (11) with ratchet teeth (4) on the outside of the neck (1). The pawls (11) and the ratchet teeth (4) are so shaped that if an attempt is made to unscrew the cap (13) merely by turning it in a counter-clockwise direction as seen from above, the pawls (11) ride over the ratchet teeth (4) so that the collar (7) is lifted on the neck (1) and is free to rotate. To enable the cap (13) to be unscrewed, the cap must be pressed downwards while it is rotated in a counter-clockwise direction to hold the pawls (11) in engagement with the ratchet teeth (4) and thus prevent the collar (7) from turning on the neck (1).