Patent ID: 7134866
Filing Date: 2006-11-14
Classification: B29C,B29L,Y10S

Abstract:
1. An apparatus for manufacturing hollow articles made of plastics having internals undercuts, comprising at least one compression-molding unit, which is composed of an upper mold part and of a lower female mold part which is aligned, along a vertical axis, with said mold part, actuation means for actuating said mold parts between a spaced position, at which a dose of plastic material sufficient to mold an article is deposited in the female mold part, and a mutually adjacent position, in order to produce the compression molding of an article, said mold part comprising a tube forming a plug, which can slide in a sleeve that constitutes an extractor associated with said plug in order to remove said molded article when said mold parts are in said space position, a stem which is accommodated coaxially, for axial movement, inside said tube, said tube having an end part provided with angularly distributed seats with respective oscillating elements articulated therein along radial planes, said oscillating elements being provided with an outer face with recesses whose shape is complementary to the shape of said undercuts and with an inner face with ramps which are in functional contact with said stem, whereby said stem is suitable, during the closure of the mold, to move with respect to said tube to actuate said oscillating elements into an external position, in which they form, with said end part of tube, said plug for molding said articles, and, during the opening of the mold parts, to allow said elements to assume an internal position in which said undercuts are disengaged from said recesses in order to allow said extractor to remove said articles from said plug.