Patents by Inventor Shuji Hitani

Shuji Hitani 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).

  • Yoke for universal joint, and production process for the same
    Patent number: 6347900
    Abstract: A yoke for a universal joint is produced by press forming of a steel sheet, and mutually concentric circular holes are formed by press punching at the tip ends of a pair of arms opposite to each other. After the circular holes are punched by inserting a punching punch through the tip ends of the arms in the state that the backs of the arms are supported by a die relative to the punching direction and the outer peripheries of these arms are restrained by a restraining member in the vicinity of a portion in which the circular holes are to be formed, a finishing punch is inserted from the direction opposite to the punching punch into the punched circular holes, thereby improving the accuracy of the circular holes.
    Type: Grant
    Filed: November 22, 2000
    Date of Patent: February 19, 2002
    Assignees: NSK Ltd., Otsuka Koki Co., Ltd.
    Inventors: Kiyoshi Sadakata, Yoshihide Sasamoto, Shuji Hitani