Closure device including a lid for closing an opening of a container

摘要

The device (1) has a cover (4) and a sealing unit (17) operating between the cover and an edge (16) of a container (3), which laterally surrounds a container opening. A retainer (28) holds down the cover on the container opening after attaching the cover on the container opening, where a hollow space is attached to the sealing unit. The hollow space increases a cross section of the sealing unit in an effective direction by the cover.