An injection molding apparatus having ejector pins with oriented shaping surfaces for product removal

Claim 1

Injection molding apparatus, for producing molded plastic articles having hook portions, perforated webs, or both, and capable of disassembly, after molding, into separate components, said apparatus comprising, in combination, two interengageable compression mold halves defining, when closed, a mold cavity conforming to the article to be molded; interengageable guiding means on said mold halves for guiding the same into closed relation; pins extending outwardly of one mold half into the mold cavity to cooperate with cavity formations on the other mold half, each of said pins being formed with a cavity at its outer end; certain of said pin cavities having a hook-defining contour and others of said pin cavities having a lug extending substantially centrally therefrom; said pin cavities receiving and retaining plastic composition material injected into said mold cavity to form hook portions and perforated web portions of the molded article; an ejector movably mounted outwardly of said one mold half and carrying article ejecting pins extending slidably through said one mold half; said first-named pins being mounted on said ejector and extending slidably through said one mold half and serving as additional article ejecting pins when said ejector is moved inwardly toward said one mold half to eject the finished article from the mold cavity following retraction of the other mold half from said one mold half; all of said pin cavities opening in the same rotational direction and providing for automatic disengagement of the molded article from said pin cavities, following ejection of the article by said ejector, by slightly rotating the molded article tHrough an angular distance of 4*-5* in said rotational direction and relative to said firstmentioned pins.