| 摘要 |
A mold core having an upper surface and at least one hole passing therethrough is provided. An ejector pin is disposed within at least one of the holes in the mold core. The ejector pin includes a bushing having an undercut portion protruding above the upper surface of the mold core for enhancing the adherence of a part molded on the mold core thereto. The bushing also has a hole passing laterally therethrough through which passes an ejector pin shaft. The ejector pin shaft, which includes a head, forces a part adhered to the mold core off of the mold core when so desired. The protruding portion of the bushing is undercut in the form of a back-drafted angle, a circumferential rib, either indented or projecting, and of a partially round or V-shaped cross-section, a series of dimples, or of any other shape which will cause the molded plastic to adhere tightly to it. The head of the ejector pin may be located out beyond bushing and may be dome-shaped, conical, or any of other various shapes. Alternately, the head of the ejector pin may be flush with bushing or may be recessed within the bushing.
|
