Patent ID: 6676401
Filing Date: 2004-01-13
Classification: B29C

Abstract:
An in-mold gate opening and closing mechanism, comprising, in one unit:a base body formed of a metallic block, said base body having a surface and an inner space; a runner gate opened and closed from a direction orthogonal to or a direction the same as a gate direction; a gate void formed at an upper end portion of the base body; a gate pin disposed in a guide groove extending continuously from said gate void; a columnar space at a lower part of said gate void inside said base body; a spring inside a moving cylinder inserted into said columnar space, a lower end of said gate pin being engaged with and fixed at a rear end of said moving cylinder, said gate pin always being pressed in a direction of said gate void by a force of said spring; and a spring pressure adjusting nut pressing a rear end of said spring provided in a screwed-in state to turn clockwise and counterclockwise at an open end side of said moving cylinder of said base body, whereby a pressing force acting on said gate pin can be increased by turning said spring pressure adjusting nut in a direction of contraction of said spring, said pressing force acting on said gate pin being decreased by turning said adjusting nut in a reverse direction.