Patent ID: 6206682
Filing Date: 2001-03-27
Classification: B29C,Y10S

Abstract:
A mold assembly for use in a molding machine that includes a knockout piston that can move up, comprising:a cavity plate forming a mold cavity with a pair of ejector pin-receiving apertures;first and second ejectors that are independently vertically moveable, with said injectors both lying under said cavity plate, with said second ejector lying under said first ejector, and with said second ejector having a primarily vertical through hole;first and second ejector pins having lower ends supported respectively on said first and second ejectors and having upper ends lying in said apertures of said cavity plate;a force member moveably mounted in said hole, said force member having a lower end lying directly over a first portion of said knockout piston so said force member is moved up when said knockout piston moves up, and said force member having an upper end lying directly under said first ejector to move up said first ejector and said first ejector pin;said force member having a vertical height between said upper and lower ends which is greater than the vertical height of said hole in said second ejector, so said force member lower end can lie below the bottom of said hole and can be moved up by said knockout piston while said force member upper end moves up said first ejector, without moving up said second ejector;said second ejector having a portion positioned in line with said knockout piston to be pushed up by said knockout piston after said force member has been moved up a predetermined distance.