Patents by Inventor Kouji Nishii

Kouji Nishii 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).

  • Automatic pressure control device for a ball screw
    Patent number: 5367915
    Abstract: Varying fluid pressure varies the thickness of an elastic spacer between ball nuts of the ball screw. The spacer thickness determines opposed axial forces applied to the ball nuts. During a high-speed excursion of the screw, pressure in the elastic spacer is reduced, thus reducing friction between the ball nuts and the screw. When the screw is being fine positioned for precise operation, pressure in the elastic spacer is increased, thereby urging the ball nuts apart to eliminate play in the ball screw.
    Type: Grant
    Filed: January 23, 1991
    Date of Patent: November 29, 1994
    Assignee: Asuka Trading Co., Ltd.
    Inventor: Kouji Nishii