Patents by Inventor Tatsutoshi Tokuyama

Tatsutoshi Tokuyama 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).

  • Control rod drive mechanism
    Patent number: 8571162
    Abstract: A control rod drive mechanism according to the present invention includes a cylindrical guide tube having a latch hole, a hollow piston coupled to the control rod and freely moving up and down within the guide tube, a latch provided in the hollow piston so as to freely swing and freely engaging with and disengaging from the latch hole of the guide tube, and a spring locking the latch to the latch hole of the guide tube. Further, an elevating member having a latch guide which can come into contact with the latch is provided so as to freely move up and down within the guide tube. Further, the latch includes a guide surface coming into contact with the latch guide of the elevating member, and the latch guide includes a guide roller coming into contact with the guide surface of the latch.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: October 29, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Daiki Maruyama, Tatsutoshi Tokuyama, Kazuhiro Kawagoe
  • CONTROL ROD DRIVE MECHANISM
    Publication number: 20100067642
    Abstract: A control rod drive mechanism according to the present invention includes a cylindrical guide tube having a latch hole, a hollow piston coupled to the control rod and freely moving up and down within the guide tube, a latch provided in the hollow piston so as to freely swing and freely engaging with and disengaging from the latch hole of the guide tube, and a spring locking the latch to the latch hole of the guide tube. Further, an elevating member having a latch guide which can come into contact with the latch is provided so as to freely move up and down within the guide tube. Further, the latch includes a guide surface coming into contact with the latch guide of the elevating member, and the latch guide includes a guide roller coming into contact with the guide surface of the latch.
    Type: Application
    Filed: September 11, 2009
    Publication date: March 18, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Daiki MARUYAMA, Tatsutoshi Tokuyama, Kazuhiro Kawagoe