Patents by Inventor Shigehiro Kirii

Shigehiro Kirii 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).

  • Patent number: 5457980
    Abstract: A cushioning apparatus for applying a blank-holding force to a pressure member to hold a blank on a press, through hydraulic cylinders on a cushion platen biased by a force generating device toward the pressure member, and cushion pins linked with the cylinders and supporting the pressure member, the blank-holding force being based on a biasing force generated by the force generating device, and controllable by a controller through a flow regulator provided in a discharge line for discharging the fluid from the cylinders, such that the controller controls the flow regulator to discharge the fluid from the cylinders during a pressing action on the blank by upper and lower dies, for thereby controlling the cylinder pressure according to a predetermined pattern of change in the pressure in relation to a downward movement of the upper die. The hydraulic cylinders may be classified into two or more groups connected to mutually independent discharge lines.
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: October 17, 1995
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazunari Kirii, Masahiro Shinabe, Shigehiro Kirii