Patents by Inventor Takeshi Tanimaru

Takeshi Tanimaru 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).

  • High-accuracy sliding bearing
    Patent number: 7785013
    Abstract: The present invention provides a high-accuracy sliding bearing which eliminates the need for treating a gate mark, has a high accuracy, is excellent in its mechanical strength, and is in its productivity. A sintered metal (2) is used as a bearing peripheral part. A resin material is molded at a sliding portion of the bearing peripheral part to form a resin layer (3). In the resin layer (3), a product of a coefficient of linear thermal expansion of the resin material and a thickness of the resin layer is not more than 0.15. The resin layer (3) is molded through tunnel gates. The resin layer comprises a plurality of axial grooves (4A) and (4B) on a bearing sliding surface thereof, and the tunnel gate marks (5) are alternately formed on a bottom of each of the grooves.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: August 31, 2010
    Assignees: NTN Corporation, Nakanishi Metal Works Co. Ltd.
    Inventors: Masaki Egami, Seiji Shimizu, Takeshi Tanimaru
  • High-accuracy sliding bearing
    Publication number: 20070177833
    Abstract: The present invention provides a high-accuracy sliding bearing which eliminates the need for treating a gate mark, has a high accuracy, is excellent in its mechanical strength, and is in its productivity. A sintered metal (2) is used as a bearing peripheral part. A resin material is molded at a sliding portion of the bearing peripheral part to form a resin layer (3). In the resin layer (3), a product of a coefficient of linear thermal expansion of the resin material and a thickness of the resin layer is not more than 0.15. The resin layer (3) is molded through tunnel gates. The resin layer comprises a plurality of axial grooves (4A) and (4B) on a bearing sliding surface thereof, and the tunnel gate marks (5) are alternately formed on a bottom of each of the grooves.
    Type: Application
    Filed: May 24, 2005
    Publication date: August 2, 2007
    Inventors: Masaki Egami, Seiji Shimizu, Takeshi Tanimaru
  • Ultrathin-walled rolling bearing and cage therefor
    Patent number: 6835000
    Abstract: It is intended to suppress rattling in the fitted state of segments to improve operating efficiency in bonding the segments together. A cage composed of a plurality of arcuate segments, wherein a joining projection formed in the bonding section of one of adjacent segments is fitted in a joining recess formed in the bonding section of the other to thereby annularly bond the segments. In this cage, said joining projection and joining recess have tapered fitting surfaces as seen in a radial section, and the two fitting surfaces are closely contacted and joined together.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: December 28, 2004
    Assignees: NTN Corporation, Nakanishi Metal Works Co., Ltd.
    Inventors: Kengo Hiramatsu, Takeshi Tanimaru
  • Ultrathin-walled rolling bearing and cage therefor
    Publication number: 20040170349
    Abstract: It is intended to suppress rattling in the fitted state of segments to improve operating efficiency in bonding the segments together.
    Type: Application
    Filed: December 22, 2003
    Publication date: September 2, 2004
    Inventors: Kengo Hiramatsu, Takeshi Tanimaru