| 摘要 |
In accordance with the present invention there is provided a new and improved internal core lifter for molding and ejecting plastic parts having undercuts. The preferred internal core lifter has a core blade with a first end configured to cooperate with the surfaces of the mold for molding a plastic part and for assisting in safe ejection of the plastic part. The core blade may be pivotally mounted at an opposite end for being disposed at a predetermined molding angle in a range of angles for accommodating various molding angles of mold apparatus. In ejecting the plastic part, the first end of the core blade moves horizontally away from the undercut while moving vertical to assist in safe ejection of the plastic part. The coupling may pivotally mount the core blade's opposite end for pivoting about multiple axes, and a support may be provided for mounting the coupling to the mold apparatus to move the opposite end of the core blade as the mold apparatus shifts its mold halves between open and closed positions. The core blade may pivot about the coupling in a first plane aligned with the linear travel of the lower end of the core blade along the support; and, if transverse loads are applied to the core blade, the core blade may also pivot in a plane at an angle to the first plane to prevent binding of the core blade and coupling relative to the support.
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