Patents by Inventor Shuuzou Hirakushi

Shuuzou Hirakushi 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).

  • Expansion shaft
    Patent number: 6428236
    Abstract: An expansion shaft includes a first and a second shaft section aligned on the same axis. The second shaft section is inserted in a fit hole of the first shaft section while both the shaft sections are interconnected via a spline or serration. A resilient member is provided which possesses a single snap ring of C-shape fitted on a thin shaft portion of the second shaft section. An arm is axially extended from the snap ring. The arm resiliently presses against an inner circumferential surface of the fit hole for preventing the shaft sections from radially vibrating relative to each other.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: August 6, 2002
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Kenichi Aota, Takayoshi Hashimoto, Junya Watanabe, Shuuzou Hirakushi
  • Expansion shaft
    Publication number: 20010002966
    Abstract: An expansion shaft includes a first and a second shaft section aligned on the same axis. The second shaft section is inserted in a fit hole of the first shaft section while both the shaft sections are interconnected via a spline or serration. A resilient member is provided which possesses a single snap ring of C-shape fitted on a thin shaft portion of the second shaft section. An arm is axially extended from the snap ring. The arm resiliently presses against an inner circumferential surface of the fit hole for preventing the shaft sections from radially vibrating relative to each other.
    Type: Application
    Filed: December 1, 2000
    Publication date: June 7, 2001
    Inventors: Kenichi Aota, Takayoshi Hashimoto, Junya Watanabe, Shuuzou Hirakushi