| 20110309111 | CARTRIDGE PISTON - A cartridge piston for pressing out a compound from a cartridge body is provided with a forwardly directed, elastic sealing lip which is arranged to bear against the cartridge wall. To allow for escape of air while the piston is being introduced, air passages are provided on the sealing lip. In a wall portion of the side wall, the piston has a non-circular shape so that, in certain regions, the abutment of the piston on the cartridge wall is less close than in other regions. In this manner, the outflow of air to the outside is facilitated. Further, the piston is arranged in its inserted state in a sealing abutment on the cartridge wall, thus precluding ingress of air into the cartridge. | 12-22-2011 |
