Patents by Inventor Chiaki Kubota

Chiaki Kubota 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).

  • Method for producing hollow rack bar
    Patent number: 7225541
    Abstract: A method for forging a rack bar from a blank pipe. Prior to the rack forging process, a blank pipe is subjected to a process for obtaining an adjustment of a cross-sectional shape of the blank pipe. Such a preliminary adjustment is constructed by a swaging process for reducing an outer diameter of the blank pipe and a ironing process for obtaining a desired irregular cross-sectional shape of the blank pipe. The ironing process is such that locally thickened wall portions are obtained at length wise ends as well as tooth width ends of a rack forging die.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: June 5, 2007
    Inventor: Chiaki Kubota
  • Method and apparatus for producing hollow rack bar
    Publication number: 20050072002
    Abstract: A method for forging a rack bar from a blank pipe. Prior to the rack forging process, a blank pipe is subjected to a process for obtaining an adjustment of a cross-sectional shape of the blank pipe. Such a preliminary adjustment is constructed by a swaging process for reducing an outer diameter of the blank pipe and a ironing process for obtaining a desired irregular cross-sectional shape of the blank pipe. The ironing process is such that locally thickened wall portions are obtained at length wise ends as well as tooth width ends of a rack forging die.
    Type: Application
    Filed: October 7, 2003
    Publication date: April 7, 2005
    Applicants: Minako Matsuoka, Hirohisa Shiokawa, Akimasa Shiokawa
    Inventor: Chiaki Kubota