Patents by Inventor Tadamitsu Iwamoto

Tadamitsu Iwamoto 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: 7318592
    Abstract: According to the invention, there is provided a steering damper (10) in which the interior of a cylinder (12) is divided into two oil chambers (A), (B) by a piston (14) which slides in the cylinder (12) as a steering operation takes place, an oil hole (15) is formed in the piston (14) for providing a communication between the two oil chambers (A), (B) and a bypass passageway (16) is provided for allowing oil in one (A or B) of the oil chambers to flow into the other oil chamber (B or A) by bypassing the oil hole (15), the motorcycle steering damper being characterized in that a subsidiary chamber (17) is defined at an intermediate position along the length of the bypass passageway (16), and in that a check ball (18) is provided in the subsidiary chamber (17).
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: January 15, 2008
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Tadamitsu Iwamoto, Takafumi Fujimori
  • Publication number: 20050151341
    Abstract: According to the invention, there is provided a steering damper (10) in which the interior of a cylinder (12) is divided into two oil chambers (A), (B) by a piston (14) which slides in the cylinder (12) as a steering operation takes place, an oil hole (15) is formed in the piston (14) for providing a communication between the two oil chambers (A), (B) and a bypass passageway (16) is provided for allowing oil in one (A or B) of the oil chambers to flow into the other oil chamber (B or A) by bypassing the oil hole (15), the motorcycle steering damper being characterized in that a subsidiary chamber (17) is defined at an intermediate position along the length of the bypass passageway (16), and in that a check ball (18) is provided in the subsidiary chamber (17), the check ball is adapted to move so as to close the bypass passageway (16) when a steering speed exceeds a predetermined value and a differential pressure between the two oil chambers reaches or exceeds a certain value.
    Type: Application
    Filed: February 20, 2003
    Publication date: July 14, 2005
    Inventors: Tadamitsu Iwamoto, Takafumi Fujimori