Device for mixing and discharging a molding composition

A two-plunger mixing gun for forming and dispensing a self-curing two-component molding composition, comprising a body (1) having a fixed grip (2), a trigger lever (3), a cartridge housing (4) and cartridge housing cover (5), said cartridge housing having a first end and a second end, said cartridge housing and housing cover having complementary semi-cylindrical recesses (10a, 10b, 12a and 12b);

• two plunger rods (8) each having a first end which protrudes out of the body (1), and a second end which is provided with a plunger (15) and movable, by actuation of said trigger lever, into the first end of said cartridge housing;
• a head piece (16) which is removably inserted into said housing adjacent the second end of said cartridge housing, a first side of said head piece facing said cartridge housing, and a second side of said head piece facing away from said cartridge housing, said first side of said head piece having two cylindrical continuations (26a, 26b) having hollow spikes (27a, 27b) molded therein, said hollow spikes communicating with separate flow channels (28a, 28b) molded internally in said head piece, said second side of said head piece having flange recesses (29) for connection of a static mixer thereto, and an inlet for a static mixer;
• said internal flow channels merging into said inlet;
• and a static mixer (6) having an inlet end and an outlet end, with flange connections (17) at the inlet end, which are attachable to said flange recesses (29) and an outlet nozzle 7 at said outlet end, whereby in operation, individual cartridges (22), each containing one of said two components, are inserted into said cartridge housing (4), cartridge housing cover (5) is closed;
• trigger lever (3) is actuated to cause said plungers to move against said cartridges and force said cartridges against said head piece and said spikes (27a, 27b) whereupon said spikes pierce said cartridges so that the components contained within said cartridges are forced into said flow channels (28a, 28b), and to flow through said flow channels into said static mixer inlet and through said static mixer, where they are mixed to form said two-component composition, which is then discharged through said outlet nozzle.