Patents by Inventor Kenichi Usuda

Kenichi Usuda 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).

  • Ball bearing for small size fan
    Patent number: 5924800
    Abstract: A ball bearing for a small size fan for supporting an axis of rotation of an impeller is formed of four or five balls (21), a crown-shaped cage (25), an inner ring (22), and an outer ring (23). By using an optimized number of the balls (21) under the working condition of a ball bearing for a small size fan, structually useless portions are eliminated. Further, by adopting the crown-shaped cage (25), reduction of the cost and the friction torque is attained, and a ball bearing having necessary and sufficinet durability is provided. By incorporating the ball bearing in a small size fan, reduction of the cost, simplification of the structure, and reduction of the electric power consumption of the small size fan are facilitated, thereby improving the commerciality as a small size fan.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: July 20, 1999
    Assignee: Minebea Co., Ltd.
    Inventors: Rikuro Obara, Motoharu Akiyama, Kenichi Usuda