Patent ID: 7431179

Claim:
A two-chamber cartridge for two-component plastic materials with storage chambers (K 1 , K 2 ) arranged axially one after the other, comprising: a cartridge tube ( 1 ) having an open rear end and a front end wall ( 2 ) with an outer mouthpiece ( 3 ) projecting from the front end wall ( 2 ), a double-walled insert ( 4 ) disposed centrally in the front part of the cartridge tube ( 1 ) and consisting of two concentric spaced tube walls ( 41 , 42 ) forming an annular gap ( 43 ) therebetween, said insert ( 4 ) dividing the front part of the cartridge interior into an annular outer partial chamber (K 1 a ) and an inner partial chamber (K 1 b ), said insert ( 4 ) being open at its rear end and closed at its front end by an end wall ( 5 ), an inner mouthpiece ( 6 ) extending from the end wall ( 5 ) into the outer mouthpiece ( 3 ) of the cartridge tube ( 1 ) and passages ( 51 , 52 ) being provided between the annular partial chamber (K 1 a ) as well as the annular gap ( 43 ) and the space between the outer mouthpiece ( 3 ) and the inner mouthpiece ( 6 ), an annular piston ( 7 ) closing the rear end of the outer partial chamber (K 1 a ) and an inner piston ( 8 ) closing the rear end of the inner partial chamber (K 1 b ), a beaker ( 9 ) inserted into the rear open end of the cartridge tube ( 1 ) and having a beaker bottom wall ( 10 ) and a center pin ( 11 ) extending centrally from the bottom wall ( 10 ), and an annular piston ( 12 ) closing the open front end of the beaker ( 9 ) and being disposed between the beaker wall and the center pin ( 11 ) and having passages ( 14 ) formed therein, said arrangement being such that the wall of the beaker ( 9 ) abuts with its front edges the annular piston ( 7 ) closing the annular partial chamber (K 1 a ), the pin ( 11 ) abuts with its front end face, the piston ( 8 ) closing the inner partial chamber (K 1 b ), the insert ( 4 ) abuts with the rear end faces of its tubular walls ( 41 , 42 ) the annular piston ( 12 ) closing the beaker ( 9 ), and the passages ( 14 ) in the annular piston ( 12 ) closing the beaker ( 9 ) extending to the annular gap ( 43 ) between the spaced tubular walls ( 41 , 42 ) of the insert ( 4 ).