Patents by Inventor Herbert Windelbandt

Herbert Windelbandt 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: 4926534
    Abstract: A poppet valve head with its stem, is formed in a female finish forming die cooperating with two male die members. A cylindrical raw blank, which has been heated is cut to length. An extrusion pressing or molding forms the shaft region and widened shaft region. An immediately following upset pressing forms the poppet disk. Both pressing steps are performed in the same female finish forming die made of hard metal mounted in a supporting frame. The female finish forming die has a cylindrical guide region on the poppet disk end. A force actuated annular or ring piston forms a first male die member fitting into the guide region. The raw blank is inserted into a central cavity of the annular piston on a coaxially arranged force actuated extrusion molding stamp forming a second male die member slidable in the central cavity. The extrusion molding stamp is axially slidable together with the annular piston and also axially slidable relative to the annular piston.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: May 22, 1990
    Assignee: Sempell Armaturen GmbH
    Inventor: Herbert Windelbandt
  • Patent number: 4163363
    Abstract: Chain links are formed of wire pins by bending each wire pin about work faces of a mandrel with bending tools which engage the pin at the two end zones thereof. The locations of engagement describe, at least during the terminal phase of the bending operation, a circular involute, the reference point of which coincides with the center of curvature of the respective work face of the mandrel.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: August 7, 1979
    Assignee: Meyer, Roth & Pastor Maschinenfabrik GmbH
    Inventors: Herbert Windelbandt, Gunter Ditges
  • Patent number: 4123899
    Abstract: Chain links are formed of wire pins by bending each wire pin about work faces of a mandrel with bending tools which engage the pin at the two end zones thereof. The locations of engagement describe, at least during the terminal phase of the bending operation, a circular involute, the reference point of which coincides with the center of curvature of the respective work face of the mandrel.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: November 7, 1978
    Assignee: Meyer, Roth & Pastor Maschinenfabrik GmbH
    Inventors: Herbert Windelbandt, Gunter Ditges