Patents by Inventor Takeshi Tatsumi

Takeshi Tatsumi 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).

  • Forming machine
    Patent number: 6477882
    Abstract: In order to obtain uniform pressing force applied to a workpiece by an ironing die and easily disengage the workpiece after completing plastic working for the workpiece, a forming machine for performing the plastic working for the workpiece has a base pedestal, a forming punch provided on the base pedestal, and an annular ironing die arranged over the forming punch. The forming punch comprises a main punch body, six punch collets to be engaged with the main punch body and separated from each other at equal angles, a metal sleeve externally fitted to the main punch body and the punch collets, and a holder for holding the metal sleeve.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: November 12, 2002
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yuichi Nagao, Yoshihisa Doi, Takeshi Tatsumi
  • Forging die incorporated with a forging apparatus
    Patent number: 6389868
    Abstract: A hydraulic pressure control apparatus comprises a high pressure accumulator for sucking pressure oil supplied to a relief chamber of a relief valve to make changeover for the relief valve from a valve-closed state to a valve-open state when a forming load is applied to the pressure oil charged in a pressure chamber and the hydraulic pressure of the pressure oil arrives at a relief preset pressure, and a low pressure accumulator for sucking the pressure oil charged in the pressure chamber via the relief valve which is in the valve-open state.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: May 21, 2002
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yuichi Nagao, Takeshi Tatsumi, Yoshihisa Doi
  • Forming machine
    Publication number: 20010011469
    Abstract: In order to obtain uniform pressing force applied to a workpiece by an ironing die and easily disengage the workpiece after completing plastic working for the workpiece, a forming machine for performing the plastic working for the workpiece has a base pedestal, a forming punch provided on the base pedestal, and an annular ironing die arranged over the forming punch. The forming punch comprises a main punch body, six punch collets to be engaged with the main punch body and separated from each other at equal angles, a metal sleeve externally fitted to the main punch body and the punch collets, and a holder for holding the metal sleeve.
    Type: Application
    Filed: February 7, 2001
    Publication date: August 9, 2001
    Inventors: Yuichi Nagao, Yoshihisa Doi, Takeshi Tatsumi
  • Forging die,and method and apparatus for controlling the same
    Publication number: 20010008080
    Abstract: A hydraulic pressure control apparatus comprises a high pressure accumulator for sucking pressure oil supplied to a relief chamber of a relief valve to make changeover for the relief valve from a valve-closed state to a valve-open state when a forming load is applied to the pressure oil charged in a pressure chamber and the hydraulic pressure of the pressure oil arrives at a relief preset pressure, and a low pressure accumulator for sucking the pressure oil charged in the pressure chamber via the relief valve which is in the valve-open state.
    Type: Application
    Filed: February 9, 2001
    Publication date: July 19, 2001
    Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
    Inventors: Yuichi Nagao, Takeshi Tatsumi, Yoshihisa Doi
  • Forging die, and method and apparatus for controlling the same
    Patent number: 6205828
    Abstract: A hydraulic pressure control apparatus comprises a high pressure accumulator for sucking pressure oil supplied to a relief chamber of a relief valve to make changeover for the relief valve from a valve-closed state to a valve-open state when a forming load is applied to the pressure oil charged in a pressure chamber and the hydraulic pressure of the pressure oil arrives at a relief preset pressure, and a low pressure accumulator for sucking the pressure oil charged in the pressure chamber via the relief valve which is in the valve-open state.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: March 27, 2001
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yuichi Nagao, Takeshi Tatsumi, Yoshihisa Doi