Patents Assigned to WK Worek Kunststofftechnik GmbH
  • Patent number: 5326247
    Abstract: An apparatus for extruding plastic tubing includes a machine stand; an extrusion cylinder supported by the machine stand; a housing supported on the machine stand; a hollow extrusion piston introducible into and withdrawable from the extrusion cylinder; an extrusion drive accommodated in the housing and connected to the extrusion piston for advancing the extrusion piston into and for withdrawing the extrusion piston from the extrusion cycliner; an mandrel pulling rod mounted in, and axially displaceable relative to, the hollow extrusion piston; a mandrel affixed to the mandrel pulling rod and moving as a unit with the mandrel pulling rod for introduction into and withdrawal from the extrusion cylinder; and a mandrel actuating drive circumferentially surrounded by a sleeve-shaped component of the extrusion drive in the housing and connected to the mandrel pulling rod for axially displacing the mandrel pulling rod.
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: July 5, 1994
    Assignee: WK Worek Kunststofftechnik GmbH
    Inventors: Karl Prenzel, Heinrich Bergner