Multi-component mixing capsule having an ejection device for the mixed compound, in particular for dental purposes

A capsule usable with an actuating tool, for mixing components and ejecting the resulting mixed compound comprising:

• a receptacle part (1) having a front portion forming a mixing chamber (5) with an ejection opening (7) in a front wall thereof and an open rear portion;
• a hollow piston (2) which can be displaced in the receptacle part (1), the piston including a rear portion initially extending rearward of the receptacle part and having a radial projection thereon and a perforated front wall (19) defining a rear wall of the mixing chamber (5) away from the ejection opening (7), the hollow portion of the piston on the rear side of the perforated wall defining an accommodation chamber (31) for a film container (32) containing a liquid component;
• a ram (3) which can be displaced in the accommodation chamber (31) by the actuating tool (16) in order to first empty the film container (32) through the perforated front wall (19) into the mixing chamber (5), and then advance the piston relative to the receptacle to eject the mixing compound;
• wherein,
• the piston (2) is initially supported relative to the receptacle by the projection against the tool force pushing forward the ram (3), and then is self-released from the receptacle while the tool advances the ram and piston to empty the film container, and
• the projection (22) is radially flexible and initially held radially outward into engagement with the receptacle part (1) by the ram (3), the ram initially protruding rearwards beyond the projection (22) by about the distance that the ram (3) travels relative to the piston (2) in order to completely empty the film container (32).