Patents by Inventor Toruaki Yogo

Toruaki Yogo 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: 5819574
    Abstract: A hydraulic device provided with a plurality of hydraulic actuators directly connected to a hydraulic pump for control. A hydraulic pump is operable in both rotational directions when the electric motor is rotated forwards and in reverse. Ports of each hydraulic actuator are connected via a connecting line in parallel with ports of the hydraulic pump. A plurality of electromagnetic valves are provided in the connecting lines to the hydraulic actuators. By opening or closing each electromagnetic valve, the operation of the associated hydraulic actuator is controlled. The operation direction of each hydraulic actuator is controlled by rotating the electric motor clockwise or counterclockwise. Further, a position sensor is provided for detecting displacement of the specified hydraulic actuator and the electric motor is controlled based on a signal transmitted from the position sensor.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: October 13, 1998
    Assignee: Kabushiki Kaisha Opton
    Inventor: Toruaki Yogo