| 摘要 |
An apparatus for manufacturing hollow articles made of plastics having internal undercuts, comprising at least one compression-molding unit (S), which is composed of an upper male mold part (1) which comprises a plug (15) and of a lower female mold part (2) which is aligned, along a vertical axis, with the male mold part (1), means for actuating the mold parts (1, 2) between a spaced position, at which a dose of plastic material sufficient to mold an article is deposited in the female mold part (2), and a mutually adjacent position, in order to produce the compression molding of an article, the male mold part (1) comprising a plug, which can slide in a sleeve (34) that constitutes an extractor (36) associated with the plug in order to remove the molded article when the mold parts are in the spaced position, the apparatus comprising a tube (30) which can slide in the sleeve (34), a stem (3) which is accommodated coaxially inside the tube (30), the tube (30) having an end portion (32) provided with angularly distributed seats in which respective oscillating elements (41) are articulated along radial planes, the elements being provided externally with recesses ( 45) whose shape is complementary to the shape of the undercuts, the stem (3) being suitable, during the closure of the mold, to actuate the oscillating elements ( 41) into an external position, in which they form, with the end portion of the tube (30), the plug for molding the articles, and, during the opening of the mold, to allow the elements to assume an internal position in which the undercuts are disengaged from the recesses in order to allow the extractor (36) to remove the articles from the plug. |
