Continuous hollow object casting machine comprises a plurality of chucks with means to convey the chucks through a helical path along a longitudinal, preferably a closed longitudinal, path, in the course of which the chucks are also rotated about an axis perpendicular to the primary helical path and...http://www.google.fr/patents/US4436500?utm_source=gb-gplus-shareBrevet US4436500 - In-line rotational casting apparatus
