Hot runner injection orifice control apparatus

Claim 1

IN AN INJECTION ORIFICE CONTROL ASSEMBYL FOR INJECTION MOLDING PLASTICIZED MATERIAL IN AN ARTICLE-FORMING MOLD, A CONTAINER ADAPTED TO HOLD PLASTICIZED MATERIAL, MEANS FOR DISPENISNG MATERIAL FROM SAID CONTAINER UNDER PRESSURE, AN INJECTION NOZZLE HAVING AN ORIFICE THROUGH WHICH MATERIAL FROM THE CONTAINER CAN BE INTRODUCED INTO SAID MOLD, AND AN ORIFICE CONTROL PIN HAVING AN END OF A SIZE AND CONFIGURATION (1) TO CLOSE THE NOZZLE ORIFICE WHEN THE PIN ABUTS THE NOZZLE AND (2) TO ACCOMMODATE THE FLOW OF MATERIAL THROUGH THE NOZZEL ORIFICE WHEN THE PIN IS SPACED FROM THE NOZZLE, THE PIN HAVING AN EXTERIOR SURFACE EXPOSED TO THE PLASTICIZED MATERIAL SO THAT THE PRESSURE OF SAID MATERIAL BIASES SAID PIN AWAY FROM SAID NOZZLE ORIFICE, THE IMPROVEMENT OF A FIRST POWER MEANS ACTING DIRECTLY ON SAID PIN AND NORMALLY BIASING SAID PIN END INTO CONTACT WITH SAID NOZLE, AND SECOND POWER MEANS FOR OVERRIDING SAID FIRST POWER MEANS TO REMOVE THE BIASING EFFECT OF SAID FIRST POWER MEANS, THEREBY ACCOMMODATING ACTUATION OF SAID PIN BY THE PRESSURE OF SAID MATERIAL TO ITS POSITION SPACED FROM SAID NOZZLE FREE OF THE BIAISNG EFFECT OF SAID FIRST POWER MEANS.