Cartridge for separate ingredients - has cup-shaped main piston containing one ingredient and auxiliary piston which is slidable to produce mixing of ingredients

摘要

The cartridge contains a number of separate ingredients, which after mixing together are force out of the cylindrical body by a piston and through a nozzle. The piston accommodates one of the ingredients and is cup-shaped, having a port in its crown which can be sealed. An auxiliary piston inside the main piston forms a seal as it slides in it until it encounters the crown. Further movement of the auxiliary piston moves the main piston so as to extrude the mixture of the material initially inside the piston and that inside the main part of the cartridge.