Patents by Inventor Klaus-Juergen Pahl

Klaus-Juergen Pahl 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: 5979211
    Abstract: A hydraulic deep drawing apparatus for a press for drawing shaped sheet metal parts from a workpiece. The apparatus comprises hydraulic pressure cylinders, a sheet holding plate supported by the hydraulic pressure cylinders and onto which the workpiece is laid, a tool baseplate arranged under the sheet holding plate, a ram which moves vertically toward the workpiece until just before contact with the workpiece, and which is fixed to a frame of the press at a gap .DELTA.s from the workpiece, and a multipoint unit having plural short stroke cylinders arranged according to a drawing ring contour, the short stroke cylinders being hydraulically actuated to bridge the gap .DELTA.s and press the workpiece against a drawing ring. A holding force for deep drawing the workpiece comprises an outer effect ring and an inner effect ring. The outer effect ring is loaded by sheet holding cylinders, and the inner effect ring is loaded by pressure pins and shaping pins.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: November 9, 1999
    Assignee: Maschinenfabrik J. Dieffenbacher GmbH & Co.
    Inventors: Klaus-Juergen Pahl, Dieter Therolf, Stephan Kruse