Carbonaceous drink bottle sealing cap - has vibrating built in whistle generating noise on opening due to escaping gas

摘要

The sealing cap is for a bottle (1) accommodating drink containing carbonic oxide gas, and incorporates a part (9) with built in plastics whistle (5) caused to vibrate, and thus generate a noise, by the gas escaping on opening. The part (9) can be so joined to the cap that on opening fully it is removed from the pouring aperture. The design affords a useful publicity feature.