Apparatus for injection-molding threaded plastic caps and stoppers
AssigneesWilfried Dreyfuss, Thomas E. Remp
InventorsWilfried Dreyfuss, Thomas E. Remp, Kurt Muller
Life of this patent
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Abstract
In injection-molding threaded molded articles in the form of plastic caps and stoppers with or without imbedded reinforcing cages, an injection unit, a closing unit and an injection mold are provided, where the movable mold half is equipped with a threading part. The threading part is irrotational and integral. A rotating tool is provided, which for the condition of open injection mold can be moved between the mold halves and is operationally linked to the molded article so it can be jointly moved with it to unscrew the molded article from the threading part. Radial and axial centering pins are provided in the injection mold to center the cage.
Claims12
Apparaus for injection molding a threaded plastic closure, comprising:
- (a) a longitudinally disposed male mold element fixed on an axis and including integral first means for forming a generally radially directed groove transverse to said axis in an endwall of a closure;
- (b) a female mold element displacable along said axis and cooperating with said male mold element for defining a mold cavity in which the closure is formed when said female element is proximate said male element and for removing the formed closure from the male element when displaced away therefrom and including integral second means for forming threads in a sidewall of the closure;
- and,
- (c) tool means displacable between a first position spaced from said mold elements and a second position disposed therebetween and including longitudinally extending ejection means comprising strip means positionable in the endwall groove of the formed closure and said ejection means rotatable on said axis for removing the closure from said female element so that the closure may be displaced therewith to said first position.
Dependencies are inferred from the claim text.