Patents by Inventor Markku Surakka

Markku Surakka 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).

  • Publication number: 20070022664
    Abstract: An arrangement in a swing door apparatus comprising a door closer provided with a return spring, which door closer comprises a body part and inside it a movable piston member, which is in force transmitting connection with a driving shaft, which is turned in accordance with the movements of the door, and an actuator, for instance an electric motor, the operating shaft of which may be in operative connection with said piston means for providing the opening movement of the door by utilizing a worm shaft, one end of which is driven by a drive nut connected to the piston member and the other end may be connected to said operating shaft of the actuator. The worm shaft comprises a worm section and a shaft section integrated thereto and provided with a flange member, which is in cooperation with a thrust bearing unit so that the moving of the worm shaft in the axial direction with respect to the body part of the door closer is prevented.
    Type: Application
    Filed: August 27, 2004
    Publication date: February 1, 2007
    Inventors: Markku Mähönen, Markku Surakka