Patent ID: 7326045
Filing Date: 2008-02-05
Classification: B29C,Y10S

Abstract:
1. A system for the improved release of a molded container from entrapping core rings in an injection mold comprising: a core portion and a cavity portion movable relative to each other between an open position whereat said core and cavity portions are separated, and a closed position whereat the core and cavity portions are pressed together to form therebetween a mold cavity in the shape of the molded container into which molten material may be injected to form said molded container; the core portion forming a central boss forming the inner surface of the container and the cavity portion forming the outer portion of the container; the core portion forming an annular trough surrounding the central boss, the boss forming an inner trough wall; an annular core ring positioned in the annular trough of the core portion adjacent the inner trough wall; a plurality of slide segments attached coaxially adjacent the annular core ring toward the cavity portion, the slide segments being positioned adjacent the inner trough wall and being outwardly laterally slidable relative to the core ring, said slide segments defining in part the rim of the molded container; a centering ring protruding from the cavity portion toward the core portion, positioned such that in said closed position the centering ring engages the slide segments to position them adjacent the inner trough wall and prevent outward lateral movement of the slide segments relative to the ring; a ring ejector system connected to the core ring which pulls the core ring and attached slide segments towards the core portion as the mold opens from the closed position to separate the slide segments from the molded container, and once the slide segments become disengaged upon opening of the mold, the slide segments are free to move outwardly laterally as the ring and slide segments are withdrawn from the molded part so as to facilitate separation of the slide segments from the inner trough wall during ejection, and thereby reduce wear of these parts during said mold opening.