Patents by Inventor Kengo Tsurugai

Kengo Tsurugai 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).

  • Publication number: 20170152907
    Abstract: Provided is a coiled spring assembly having a coiled spring and a seat for the coiled spring, in which the coiled spring has an end turn formed up to a first turn with a reduced diameter and a transition portion with a diameter gradually increasing from the end turn to a body portion, the seat has a seat portion, a mounting shaft portion, and an enlarged diameter portion, the mounting shaft portion has an axial length defining a gap or a zero-gap between the enlarged diameter portion and the end turn in a free state in which the end turn is fitted to the mounting shaft portion and the bearing surface of the end turn is in contact with the receiving surface of the seat portion, and the transition portion circumvents the enlarged diameter portion while the bearing surface is in contact with the receiving surface.
    Type: Application
    Filed: June 19, 2015
    Publication date: June 1, 2017
    Inventors: Nobuharu KATO, Kengo TSURUGAI, Masafumi MORIMOTO
  • Publication number: 20160160306
    Abstract: To provide a coil spring having excellent fatigue resistance. Disclosed is a coil spring made of steel, including (in % by mass, the same shall apply for a chemical composition): C: 0.40 to 0.70%; Si: 1.50 to 3.50%; Mn: 0.30 to 1.50%; Cr: 0.10 to 1.50%; V: 0.50 to 1.00%, and Al: 0.01% or less (excluding 0%), with the balance being iron and inevitable impurities, wherein an average crystal grain size number of prior austenite crystals in a depth of 0.3 mm from a surface is 11.0 or more, while a difference in grain size number between the respective prior austenite crystals is in a range of less than 3 from a grain size number observed at the maximum frequency, and wherein a carburized layer is provided in a depth of 0.30 to 1.00 mm from the surface, while an average Vickers hardness is 600 or higher at a position in a depth of (¬ľ)√ódiameter in the depth direction from the surface.
    Type: Application
    Filed: July 8, 2014
    Publication date: June 9, 2016
    Applicants: NHK Spring Co., Ltd., Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Shinko Wire Co., Ltd.
    Inventors: Fumio YAMAMOTO, Kengo TSURUGAI, Nao YOSHIHARA, Kei MASUMOTO, Hiroshi OURA, Tetsuo JINBO, Toshio MAEHATA, Yoshiharu YAMAMOTO
  • Patent number: 9041194
    Abstract: The pressure unit includes a spring member that is formed into a coil form obtained by winding a wire rod and that has a periodically changing pitch angle and a housing member to which end portions of the spring member are attached, and the pressure unit pressurizes a semiconductor stacked unit obtained by alternately stacking a semiconductor element module and a cooling tube that makes contact with the semiconductor element module and cools the semiconductor element module.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: May 26, 2015
    Assignee: NHK Spring Co., Ltd.
    Inventors: Noritoshi Takamura, Michiya Masuda, Ichiro Sasuga, Nobuharu Kato, Kengo Tsurugai
  • Publication number: 20140001630
    Abstract: The pressure unit includes a spring member that is formed into a coil form obtained by winding a wire rod and that has a periodically changing pitch angle and a housing member to which end portions of the spring member are attached, and the pressure unit pressurizes a semiconductor stacked unit obtained by alternately stacking a semiconductor element module and a cooling tube that makes contact with the semiconductor element module and cools the semiconductor element module.
    Type: Application
    Filed: March 15, 2012
    Publication date: January 2, 2014
    Applicant: NHK SPRING CO., LTD.
    Inventors: Noritoshi Takamura, Michiya Masuda, Ichiro Sasuga, Nobuharu Kato, Kengo Tsurugai