Patents by Inventor Martin Demharter

Martin Demharter 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: 9956644
    Abstract: A method and a device for improving the quality of the weld seam in friction stir welding is provided. The process of friction stir welding is effected by means of a friction welding tip, in which a spiral conveyor screw is provided in the spindle bearing. The longitudinal axis of the spindle bearing is inclined at an angle to the vertical. The sliding surface of the rotating spindle consists of a flat sliding surface and, for the welding of curved seams, in each case of a sliding surface inclined at an acute angle to the sliding surface, the friction welding tip is designed in the shape of a truncated cone. The lateral surface of the truncated cone is formed by six trapezoidal planar parts, of which three planar parts each uniformly distributed at the circumference lie at an angle of 120 degrees with respect to one another and account for a proportion greater than ? at the circumference.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: May 1, 2018
    Assignee: Grenzenbach Maschinenbau GmbH
    Inventors: Johann Foerg, Martin Demharter, Andreas Reitenauer
  • Publication number: 20150102087
    Abstract: A method and a device for improving the quality of the weld seam in friction stir welding is provided. The process of friction stir welding is effected by means of a friction welding tip, in which a spiral conveyor screw is provided in the spindle bearing. The longitudinal axis of the spindle bearing is inclined at an angle to the vertical. The sliding surface of the rotating spindle consists of a flat sliding surface and, for the welding of curved seams, in each case of a sliding surface inclined at an acute angle to the sliding surface, the friction welding tip is designed in the shape of a truncated cone. The lateral surface of the truncated cone is formed by six trapezoidal planar parts, of which three planar parts each uniformly distributed at the circumference lie at an angle of 120 degrees with respect to one another and account for a proportion greater than ? at the circumference.
    Type: Application
    Filed: May 29, 2013
    Publication date: April 16, 2015
    Applicant: Grenzebach Maschinenbau GmbH
    Inventors: Johann Foerg, Martin Demharter, Andreas Reitenauer