Importance

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Abstract

A side-action mechanism is provided for forming recesses or apertures in injection molded plastic parts and which includes a slide carrier and a driver actuator therefor which are part of a modular side-action cam unit that can be attached entirely into one mold half, e.g., the core half, so as to avoid having to machine and customize the other mold half or cavity half as with prior side-action devices. In addition, the modular side-action cam unit provides a driving surface that is preferably flat which engages the bottom flat of the cavity half to obviate the alignment problems which can occur in the prior angled cam pin side-action mechanisms. The present modular cam unit is a small unit and does not take as long to install into the mold as the prior side-action cam mechanisms which required installing parts in both the cavity and core halves of the mold. The cam unit herein in its preferred form, utilizes a total of five (5) parts which are all self-contained in a housing to provide a design which can be fit in the mold in a very straightforward and quick manner by the mold builder. The actuator is spring biased so that the opening force of the mold is not used to withdraw the core pin from the mold cavity. Preferably, two-stage spring loading is utilized with a high initial spring load applied to free the coring pin from the plastic in the cavity and a lower secondary load applied for the remainder of the withdrawal travel.

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First Claim