BOTTLE CAP

摘要

A bottle cap comprises an outer cylinder (1) attached to the mouth portion of a bottle, and an inner cylinder (2) connected to the outer cylinder (1) and suspended in a cavity within the mouth portion. The inner cylinder (2) includes a barrier (3) at its one end, which can be displaced toward the bottom of the bottle, and a thin sheet (4) at the other end, thereby forming a closed chamber (M) for storing an ingredient to be added to the liquid content in the bottle. The barrier (3) has a perforator (5) which can be displaced to open the thin sheet (4), thereby allowing the ingredient in the chamber (M) to fall into the bottle.