Patent ID: 8029267

Claim:
An ejector apparatus for moving a lift core which extends through a core constituting a component of a resin molding mold to form an undercut portion in a molded piece and which is installed so as to be capable of moving obliquely with respect to the core surface and in the longitudinal direction, comprising: an ejector plate arranged between the core and a base plate so as to be capable of moving up and down, the base plate being arranged below the core; a slide path formed in the ejector plate so as to extend in a direction in which a lower end of the lift core makes relative horizontal movement at a time of ascent and descent of the lift core; a slide base movably arranged in the slide path and coupled to the lower end of the lift core; a guide rod imparting a moving force within the slide path to the lower end of the lift core at a time of ascent and descent of the ejector plate; and an adjustment coupling supporting the lower end of the lift core such that the lift core is extendable in the longitudinal direction, wherein the slide base includes a base main body having forked portions at the ends of the base main body, and a guide bush supported by the forked portions so as to be rotatable in an inclining direction of the lift core, wherein the guide bush has a passing hole extending along an axis perpendicular to a rotation axis of the guide bush, through which the guide rod that serves to force the slide base to slide at the time of ascent and descent of the ejector plate is slidably passed, wherein the lower end of the lift core is mounted supportively so as to be rotatable in the inclining direction such that an inclination angle of the guide rod is the same as that of the lift core, wherein the base main body has two forked portions, with the guide bush being arranged in one forked portion, and a shaft coupling supported so as to be rotatable in the inclining direction being arranged in the other forked portion, and wherein rotation-restraining members are provided within the other forked portions, which make contact with the shaft coupling and prevent free rotation of the shaft coupling in the inclining direction.