Patents by Inventor Junichi Kasa

Junichi Kasa 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).

  • Method of forming helical splines with stoppers on a rotary shaft, and rolling tools for practicing the method
    Patent number: 5379622
    Abstract: In forming helical splines with stoppers on a rotary shaft, its large-diameter portion is held between a pair of rolling tools, each of which comprises: a helical teeth forming die having inclined teeth; an aligning teeth die having aligning teeth which are aligned with every other inclined tooth when combined with the helical teeth forming die; and a finishing teeth die having finishing teeth which are equal in pitch to the aligning teeth. Under this condition, the shaft is rolled under pressure by moving the rolling tools, to form helical grooves, and communication grooves communicated with every other helical grooves on the large-diameter portion, leaving stoppers between the communication grooves. Hence, the helical splines are formed by one rolling operation, with burrs formed between the spline grooves and the communication grooves being automatically removed.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: January 10, 1995
    Assignees: Mitsubishi Denki Kabushiki Kaisha, O S G Corporation
    Inventors: Mitsuo Saito, Yoshihiro Umebayashi, Shigetake Aoyagi, Shuzo Isozumi, Noriyuki Tanaka, Junichi Kasa