Patents by Inventor Hansrudolf Bisang

Hansrudolf Bisang 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).

  • Electro-mechanical pivot wing drive for pivoting wings of doors or the like
    Patent number: 5386885
    Abstract: The electro-mechanical drive includes an electric motor, a transmission and a restoring spring. To improve the capacity to close the door, particularly in the event of a power failure, a large coil spring used as the restoring spring surrounds the electric motor and transmission. The electric motor is short circuited when not powered in order to create a generator effect with consequent damping during movement of the door.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: February 7, 1995
    Assignee: Record Turautomation GmbH
    Inventors: Helmut H. Bunzl, Hansrudolf Bisang, Hans Minder, Daniel Burgi