Patents by Inventor Yujiro Nagayama

Yujiro Nagayama 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 manufacturing outside ring
    Patent number: 5125256
    Abstract: An outside ring manufacturing method comprises a first step of blanking out from a metal sheet a blank with a circular body portion and tongue portions which protrude at several places from the outer peripheral edge of this body portion, a second step of press forming the blank so that the body portion is formed into a tapered cylinder portion which tapers off or decreases in diameter with the distance away from the tongue portions and so that the tongue portions are made parallel to an axis of the tapered cylinder portion, a third step of adjusting the geometry of each part to a predetermined geometry through the machining of an end surface of the tapered cylinder portion and the tongue portions, and a fourth step of heat treatment to achieve a desired hardness.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: June 30, 1992
    Assignee: Nippon Seiko Kabushiki Kaisha
    Inventors: Kiyoshi Ohkubo, Yujiro Nagayama