Patents by Inventor Rolf Ellermann

Rolf Ellermann 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: 5939687
    Abstract: A knee-operated switch for a working machine, the switch including a carrier supported to the machine and a profile extending off the carrier at an angle to the profile. The profile includes first and second elongate, parallel electric contact strips that are normally separated. Sheathing over at least one of the strips is deflectable to in turn deflect the contact strips into engagement. Support strips support the contact strips normally apart until the contact strips are deflected together. A flexible elastic housing over the sheathing and the strips is deflectable to deflect the sheathing to move the contact strips together. The switch profile extends over a length so that actuation can take place at different actuating points along the profile.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: August 17, 1999
    Assignee: Durkopp Adler Aktiengellschaft
    Inventor: Rolf Ellermann
  • Patent number: 4815404
    Abstract: A servo device for a multineedle sewing machine which includes two needle bars; driving and steop devices for said needle bars; devices for engaging and disengaging the two needle bars relative to the driving and stop devices; a feed-length adjustment device associated with at least one feed dog for the transport of the material being sewn; an adjustable thread tensioning device for the needle threads; devices for locking each needle bar selectively in its highest position; a positioning drive for the multineedle sewing machine; and a device including a position indicator attached to an arm shaft of the multineedle sewing machine, for adjusting the speed of rotation and positioning of the needle bars in predetermined positions.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: March 28, 1989
    Assignee: Durkoppwerke GmbH
    Inventors: Rolf Ellermann, Wilhelm Stapel, Gunter Droste