TUBE CORRUGATING APPARATUS

摘要

A tube is advanced lengthwise through passages provided in two longitudinally spaced universally movable bearing means of which each surrounds a portion of the path of advancement of the tube. That section of the tube which is located between the bearing means can thus flex transversely of the path without appreciable stretching of its material. A grooving unit is located between the bearing means and can orbit about the tube, engaging the same individually and successively with a plurality of grooving tools each of which comprises at least two pressure rolls, with the tools traveling about an axis at least substantially normal to the path of advancement of the tube and at such a rate of speed that the tube section is contacted by one tool at a time.