Patents by Inventor Karl-Heinz Margraf

Karl-Heinz Margraf 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).

  • Positioning of edge rolls
    Patent number: 4803862
    Abstract: A positioning device for rollers in an edging stand includes two hydraulic cylinder piston adjusting drives being laterally offset from each other and from a vertical plane; further included are two spindle drives each with a spindle and a nut, the spindles being arranged one above the other in that plane, the stand further includes a cross head and a coupler plate which holds the nuts and is articulated to the pistons of the cylinder piston adjusting drives while the cylinders are articulated on the cross head.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: February 14, 1989
    Assignee: Mannesmann AG
    Inventors: Dieter Schulze, Karl-Heinz Margraf
  • Fastening a hydraulic drive in roll stands
    Patent number: 4748840
    Abstract: Existing roll housings are retro-fitted with a hydraulic drive by placing a sleeve with a collar in the bore that used to accommodate an adjusting spindle. The sleeve has a threaded extension on which is screwed a nut with a flange to which, in turn, the drive is releasably fastened. The sleeve is tension-biased in that the collar is urged against an internal shoulder. The piston rod traverses the sleeve and holds the mount for the upper roll.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: June 7, 1988
    Assignee: Mannesmann AG
    Inventors: Dieter Schulze, Karl-Heinz Margraf, Kurt Rotert