Patents by Inventor Tamio Totsuka

Tamio Totsuka 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 for inclearing thickness of outer peripheral portion of disc, and method for molding disc member having transmitting portion in outer periphery thereof
    Patent number: 5737955
    Abstract: In a method for increasing the thickness of an outer peripheral portion of a metallic disc material, a first forming die is prepared so as to have a first groove portion on an outer periphery thereof for receiving the metallic disc material. The first groove portion has a pair of side walls and a bottom wall therebetween. The side walls has inclined surfaces facing each other so as to increase the width of the first groove portion toward the outer peripheral portion of the metallic disc material. One of the side walls has a greater length from the bottom wall of the first groove portion than that of the other side wall. The first cylindrical forming die is pressed against the outer peripheral portion of the metallic disc material in a radial direction to form a thickened outer peripheral portion of the metallic disc material.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: April 14, 1998
    Assignee: Fujikiko Kabushiki Kaisha
    Inventors: Masakiyo Ohya, Tamio Totsuka