Patents by Inventor Haruo Oka

Haruo Oka 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).

  • Retainer assembling apparatus and retainer assembling method
    Patent number: 8793851
    Abstract: This invention provides a retainer assembling apparatus which assembles a retainer to a valve stem via a cotter which engage with an engaging groove formed on the valve stem. The cotter comprises a pair of cotter segments. The apparatus includes a cylindrical body, a holding portion which holds the retainer contacting a lower end of the cylindrical body, a push-up shaft which pushes up the pair of cotter segments into the cylindrical body, and an axial body which is arranged in the cylindrical body to be coaxial with the push-up shaft and to be coaxially movable. The cylindrical body includes a tapered inner circumferential portion on an inner circumferential wall lower portion thereof.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: August 5, 2014
    Assignee: Hirata Corporation
    Inventors: Hiroyuki Shiga, Kotaro Takamura, Yukihiro Kawamoto, Masahiro Koizumi, Haruo Oka, Koji Matsuda
  • RETAINER ASSEMBLING APPARATUS AND RETAINER ASSEMBLING METHOD
    Publication number: 20120285015
    Abstract: This invention provides a retainer assembling apparatus which assembles a retainer to a valve stem via a cotter which engage with an engaging groove formed on the valve stem. The cotter comprises a pair of cotter segments. The apparatus includes a cylindrical body, a holding portion which holds the retainer contacting a lower end of the cylindrical body, a push-up shaft which pushes up the pair of cotter segments into the cylindrical body, and an axial body which is arranged in the cylindrical body to be coaxial with the push-up shaft and to be coaxially movable. The cylindrical body includes a tapered inner circumferential portion on an inner circumferential wall lower portion thereof.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Applicant: HIRATA CORPORATION
    Inventors: Hiroyuki SHIGA, Kotaro Takamura, Yukihiro Kawamoto, Masahiro Koizumi, Haruo Oka, Koji Matsuda