Trailing piston having a support lip

A sealing and dispensing piston for insertion into an interior of a cartridge, the piston comprising:

• a piston plate configured to contact a filling substance disposed in the interior of the cartridge;
• a skirt section adjoining a rear of the piston plate;
• a front lamella extending forward from the skirt section to form a space between the front lamella and a front portion of the skirt section, wherein the front lamella has a sealing surface configured to abut against an inner surface of a wall of the cartridge;
• at least one first rear sealing lip extending in the region of a rear end of the skirt section or is formed by the rear end of the skirt section, the first rear sealing lip configured to bear elastically against the wall of the cartridge to seal against the inside of the wall of the cartridge and configured to automatically press outward when acted upon by a fluid coming from the rear of the piston;
• and
• at least one second rear sealing lip extending from the skirt section at an axial position spaced from the rear end of the skirt section, the second rear sealing lip configured to bear elastically against the wall of the cartridge to seal against the inner side of the wall of the cartridge and configured to automatically press outward when acted upon by a fluid coming from the rear of the piston;
• wherein the sealing surface is configured to form a seal between the inside of the wall of the cartridge and the piston, such that the sealing surface elastically abuts the inside of the wall to prevent the filling substance from passing through the area between the front lamella and the inside of the wall;
• wherein the front lamella is at least one of elastically designed and mounted in such a way that the piston automatically moves backwards or forwards along the wall of the cartridge when an overpressure or underpressure is generated due to expansion, shrinkage, or movement of the filling substance;
• and
• wherein the front lamella has a lamella edge from which a plurality of projections extend toward a central axis of the piston, and the projections project forward beyond the front end of the front lamella, and the plurality of the projections form an outwardly facing ramp surface extending obliquely rearwardly and merging into the lamella edge.