Patent ID: 6840757

Claim:
An injection nozzle for a mixing head of reaction molding machine, comprising: a housing; a nozzle needle received in the housing and movable between two end positions to thereby adjust outflow of a component through art exit opening wherein the exit opening has a first opening cross section, when the nozzle assumes one of the end positions, and has a second opening cross section, when the nozzle needle assumes the other one of the end positions, wherein the first and second opening cross sections are different in size to allow to thereby allow different amounts of components to be discharged; a control sleeve operatively connected to the nozzle needle to move the nozzle needle between the end positions and having a pressure chamber provided for admission of a pressure medium; a control piston received in the pressure chamber and having a nozzle-needle proximal side confronting the pressure chamber and a nozzle-needle distal side; an adjustable first stop defining one of the end positions and abutted by the control sleeve as a result of inflowing component; and an adjustable second stop for abutment of the nozzle-needle distal side of the control piston, said control sleeve moving against the nozzle-needle distal side of the control piston to define the other one of the end positions as pressure medium is admitted into the pressure chamber.