Patents by Inventor Kazuhiro Itonaga

Kazuhiro Itonaga 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).

  • Return spring for clutch
    Patent number: 5911295
    Abstract: A compression coil spring is used as a return spring which is stored in the housing of a clutch to urge the clutch piston in its returning direction. The effective number of turns of the compression coil spring is two or less, and the number of turns at an end-turn portion thereof is more than 0.45 and not more than 0.7. The compression coil spring is used in the compressed state throughout the operating stroke of the clutch piston. The number of turns at the end-turn portion is desirably within the range of 0.5 to 0.65, more desirably within the range of 0.55 to 0.62.
    Type: Grant
    Filed: October 1, 1997
    Date of Patent: June 15, 1999
    Assignees: F.C.C. Ltd., NHK Spring Co., Ltd.
    Inventors: Kazuhiro Itonaga, Jun Tokumasu, Kenjiro Kawanabe, Yutaka Nishida, Ichiro Sasuga