Patents by Inventor Sadaaki Hara

Sadaaki Hara 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).

  • Seal structure
    Patent number: 6454273
    Abstract: A seal structure of the present invention is composed of a sliding member 2, a supporting member 1 which stores the sliding member 2 slidably, and a seal ring 5 provided between the sliding member 2 and the supporting member 1. The seal ring 5 is formed by a lip section 10 on which a pressure of a hydraulic operating fluid acts and a heel section 11 for supporting a working pressure. Since the seal structure is such that an annular pressure receiving area between an inner circumference and an outer circumference of the lip section 10 is smaller than an annular supporting area between an inner circumference and an outer circumference of the heel section 11, a pressure which acts on the seal ring 5 is reduced and deformation to a sliding surface side of the heel section 11 is prevented.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: September 24, 2002
    Assignee: Kayaba Kogyo Kabushiki Kaisha
    Inventors: Mituhiro Kashima, Sadaaki Hara, Masahide Kanda, Koji Mitushima