Patent ID: 7828141

Claim:
A closure for a container having a nozzle, the closure comprising: an adapter part having an external thread and that can be fastened onto the container nozzle forming a container opening; a hood-shaped part screwed onto the external thread of the adapter part and forming an upper removal opening; a capsule adapted to rest on an upper edge of the container nozzle and holding an active compound that can be brought into an interior of the container; and blades that can cut open the capsule and that project from a blade ring which can be rotated by rotation of the hood-shaped part and can be moved downward, wherein during a first rotational range of the hood-shaped part, the blade ring can be moved downward until the blades stab into the capsule and a spring in the blade ring can be tensioned to exert a spring pressure on the capsule, and during a subsequent, second rotational range of the hood-shaped part, the blade ring can be rotated by the hood-shaped part generally without a further movement downward.