Patents by Inventor Erhard Hentzschel

Erhard Hentzschel 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).

  • Controlling upsetting during welding of a split tube
    Patent number: 4287402
    Abstract: Markings are placed alongside the gap of a split tube and their distance is measured downstream from the point of welding; the measuring result is used to control upsetting pressure in the weld print.
    Type: Grant
    Filed: June 7, 1979
    Date of Patent: September 1, 1981
    Assignee: Mannesmann AG.
    Inventors: Erhard Hentzschel, Erhard Jaspert, Kurt Niederhoff
  • Motion control for the feed mechanism in pilger rolling mills
    Patent number: 3948070
    Abstract: The feed mechanism for a pilger or Mannesmann rolling mill is driven by an electrical linear motor which is controlled on the basis of two pulse trains. One train is derived from the rolls, the other one from the reciprocating motor. The control is carried out to distinguish between a constant speed phase during a rolling pass, an acceleration phase for advancing the feed mechanism and a deceleration phase to obtain reversal ahead of re-engagement of the bloom by the rolls for the next rolling step.
    Type: Grant
    Filed: January 8, 1975
    Date of Patent: April 6, 1976
    Assignee: Mannesmannrohren-Werke AG
    Inventors: Erhard Hentzschel, Heinz Schumacher