Patents by Inventor Heinrich Bergner

Heinrich Bergner has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 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