Abstract: A closure device for sealing an opening of a container, wherein the container opening has an opening edge which includes an inner wall and an outer wall. The closure device further includes a sealing element so that the opening of the container can be tightly sealed. A closure device of this kind is characterized in that a sealing of the container by the closure device is independent of a contact pressure applied from the closure device onto the container, in particular onto the opening edge.

Abstract: The invention relates to a securing element (10) for a closing element (20), said closing element (20) having a center piece (21) which comprises an actuation zone (22), and holding means (23). The closing element (20) closes an opening (31) of a container (30) which has a longitudinal axis (34) in a first position (I) and releases the same in a second position (II), the holding means (23) being in positive fit with the container in the first position (I). The closing element (20) can be brought from the first into the second position (I, II) by the action of a pressure onto the actuation zone (22) in the direction of the container (30) so that the holding means (23) releases the form fit.

Abstract: The invention relates to a closure device (2) for sealing an opening of a container (1), wherein the opening (1.1) of the container (1) has an opening edge (1.2) which comprises an inner wall (1.3) and outer wall (1.4), and wherein the closure device (2) has a sealing element (4) so that the opening (1.1) of the container (1) can be tightly sealed. A closure device of this kind is characterized in that a sealing of the container (1) by the closure device (2) is independent of a contact pressure (Pk) which is applied from the closure device (2) onto the container (1), in particular onto the opening edge (1.2).