Patents by Inventor Masaru Terasaki

Masaru Terasaki 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).

  • Rolling bearing and spindle apparatus for machine tool
    Patent number: 6742934
    Abstract: A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression: AI=LH3/dm≧0.025 in which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: June 1, 2004
    Assignee: NSK Ltd.
    Inventors: Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Tamotsu Misawa, Masaru Terasaki
  • Rolling bearing and spindle apparatus for machine tool
    Publication number: 20020097939
    Abstract: A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression: AI=LH3/dm ≧0.025 in which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.
    Type: Application
    Filed: October 26, 2001
    Publication date: July 25, 2002
    Applicant: NSK LTD.
    Inventors: Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Tamotsu Misawa, Masaru Terasaki
  • Rolling bearing and spindle apparatus for machine tool
    Patent number: RE48843
    Abstract: A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression: AI=LH3/dm?0.025 LH3/dm2?0.025 mm2 in which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: December 7, 2021
    Assignee: NSK LTD.
    Inventors: Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Tamotsu Misawa, Masaru Terasaki