| 摘要 |
A closure device (10) including a fluid chamber (22) is disclosed. The closure device (10) is fitted to an opening in the neck (16) of a container (12), such as a bottle. The additive can be introduced and mixed into a liquid in the container (12) by operation of the closure device (10). The closure device (10) includes a cap member (20) having a fluid chamber and a housing having a plug member (42). The cap member (20) is provided with a primary engagement means, such as an internal thread (30), which engages with a corresponding primary engagement means provided on the housing, such as an external thread (50), to allow the cap member (20) to be lifted relative to the housing (40) from a closed position in which the plug member closes an aperture (25) in the fluid chamber (22) to an open position in which the plug member is at least partially withdrawn from the aperture (25), thereby allowing the additive to pass from the fluid chamber (22) to the liquid in the bottle (12). The closure device (10) enables mixing of the additive and liquid in the bottle (12) without opening the closure in such a way as to allow the liquid to escape.
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