Patents by Inventor Kikuo Yamashita

Kikuo Yamashita 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).

  • Injection molding machine for making a worm wheel
    Patent number: 6638054
    Abstract: The invention relates to a worm wheel for use in a reduction gear, for example, and to a machine and a method for forming the same. The worm wheel includes a tooth having a tooth crest. At least the teeth are formed by injection molding a synthetic resin. The tooth crest includes a trace formed along a parting line as a result of the injection molding process. The trace does not exist on a surface of action of the tooth. The invention is suitable for applications demanding high contact gear accuracies.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: October 28, 2003
    Assignees: Koyo Seiko Co., Ltd., Fukui Seiki Kogyo Co., Ltd.
    Inventors: Kikuo Yamashita, Tetsuya Minamiguchi, Takanori Kurokawa, Michitoshi Mitsumaru
  • Worm wheel and machine and method for forming the same
    Publication number: 20020078776
    Abstract: The invention relates to a worm wheel for use in a reduction gear, for example, and to a machine and a method for forming the same. The worm wheel includes a tooth having a tooth crest. At least the teeth are formed by injection molding a synthetic resin. The tooth crest includes a trace formed along a parting line as a result of the injection molding process. The trace does not exist on a surface of action of the tooth. The invention is suitable for applications demanding high contact gear accuracies.
    Type: Application
    Filed: December 26, 2001
    Publication date: June 27, 2002
    Inventors: Kikuo Yamashita, Tetsuya Minamiguchi, Takanori Kurokawa, Michitoshi Mitsumaru