Patents by Inventor Toshimi Takajo

Toshimi Takajo 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).

  • Thrust needle-shaped roller bearing, rolling bearing, and cage of the thrust needle-shaped roller bearing
    Patent number: 5630668
    Abstract: A rolling bearing includes an outer raceway, an inner raceway, a plurality of rolling elements interposed between the outer raceway and the inner raceway, and a cage for holding the rolling elements away from each other at the same interval in a rolling direction of the rolling elements, the cage including a first layer subjected to a surface treatment of at least one of carbonitriding, phosphating, sulfonitriding and gas soft nitfriding, and a second layer formed of at least one of PTFE, MoS.sub.2, WS.sub.2, Ag and Sn when the first layer includes a treated surface subjected to the surface treatment of phosphating. The rolling bearing can stabilize the attitude of the rolling elements and retain the ease of grinding them. At the same time, the dynamic torque of the rolling elements can be minimized while insuring to prevent the rolling elements from falling away from the cage.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: May 20, 1997
    Assignee: NSK Ltd.
    Inventors: Katsuhiro Ikezawa, Hiroshi Iwasa, Yasuhiro Nomura, Toshiro Kawamura, Hiroshi Narai, Takashi Nagato, Dai Kinno, Tsutomu Abe, Magozo Hamamoto, Fumio Ueki, Toshimi Takajo
  • Cage for rolling bearing
    Patent number: 5575570
    Abstract: A cage for a rolling bearing; the cage is obtained by molding a resin composition comprising 100 parts by weight of a heat-resistant and oil-resistant resin and from 5 to 100 parts by weight of a polyolefin and immersing the resulting molded article in a lubricating oil. Also is disclosed is a rolling bearing with the cage fitted therein and having been subjected to oil plating.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: November 19, 1996
    Assignee: NSK Ltd.
    Inventors: Takahiko Uchiyama, Youichiro Sugimori, Toshimi Takajo, Michiharu Naka, Masao Yamamoto, Emiko Shiraishi, Atushi Yokouchi
  • Dynamic pressure type bearing and spindle unit
    Patent number: 5009520
    Abstract: A dynamic pressure type bearing is applicable to a precision mechanical equipment. The bearing includes a hollow inner cylinder to fit a rotatable shaft. The inner cylinder is made of a thermosetting resin containing a 5 wt % to 75 wt % heat treated phenol resin powder and a 5 wt % to 75 wt % silicon dioxide, the total content of the phenol resin powder and the silicon dioxide being 50 wt % to 80 wt %. A spindle unit includes the bearing and a spindle made of an alloy containing aluminum as a main element. The bearing has a superior wear resistance, frictional characteristic and molding accuracy of the inner cylinder. The superior frictional characteristic of the inner cylinder allows a relatively soft spindle to be used in a spindle unit.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: April 23, 1991
    Assignee: Nippon Seiko Kabushiki Kaisha
    Inventors: Toshimi Takajo, Hiromitsu Asai, Kiyoshi Haginuma