Closure for the die cylinder of die-casting machines for thermoplastic material

Claim 1

A CLOSURE FOR THE DIE-CYLINDER OF DIE-CASTING MACHINES FOR THERMOPLASTIC ARTIFICAL MATERIAL FOR THE SECURING OF A NOZZLE HEAD AND OF A CYLINDER HEAD IN SAID DIECYLINDER, COMPRISING A CYLINDER HEAD, A NOZZLE HEAD RECEIVED BY AND AXIALLY MOVABLE IN SAID CYLINDER HEAD, SAID CYLINDER HEAD AND SAID NOZZLE HEAD CONSTITUTING ELEMENTS TO BE RELEASABLY COUPLED TOGETHER, ONE OF SAID ELEMENTS HAVING A RECESS OPEN FORWARDLY AT TWO DIAMETRICALLY OPPOSITE OPEN ZONES, THE OTHER OF SAID ELEMENTS HAVING DIAMETRICALLY OPPOSITE FLANGES COMPLEMENTARY TO SAID RECESS AND EXTENDING ANGULARLY FOR A LENGTH SUBSTANTIALLY EQUAL WITH THAT OF SAID OPEN ZONES OF SAID ONE OF SAID ELEMENTS, SO THAT OPEN RELATIVE ROTATION OF SAID ELEMENTS FOR ABOUT 90* SAID NOZZLE HEAD IS AXIALLY REMOVABLE FROM SAID CYLINDER HEAD, AND SAID RECESS BEING OF GREATER AXIAL WIDTH THAN THE AXIAL WIDTH OF SAID FLANGES, SO THAT SAID OTHER OF SAID ELEMENTS IS AXIALLY MOVABLE RELATIVE TO SAID OTHER OF SAID SAID ELEMENTS WHILE IN OPERATIVE LOCKING POSITION AND YIELDINGLY CHARGEABLE BY THE PRESSURE OF THE THERMOPLASTIC ARTIFICIAL MATERIAL.