Patents by Inventor Yasuo Ueki

Yasuo Ueki 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).

  • Device for stopping passenger conveyor
    Patent number: 4139810
    Abstract: The present invention is a device for stopping a passenger conveyor.A stop pushbutton is depressed to deenergize a driving motor for an escalator and an operating winding for an electromagnetic brake. The electromagnetic brake has a mechanical braking means whose operations is opposed by the magnetic force of the operating winding. Then two timing relays are energized and also the brake operating winding is reenergized through a variable resistor to brake the motor with a low braking force. The timing relays are successively picked up after predetermined time intervals to increase the resistance of the resistor to increase the braking force stepwise by decreasing the current and hence the magnetic force of the operating winding. When the escalator reaches a predetermined low speed, the brake operating winding is again deenergized to apply the rated braking force to the motor until the escalator is stopped.
    Type: Grant
    Filed: March 23, 1977
    Date of Patent: February 13, 1979
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuo Ueki, Masaaki Nakayama