Patents by Inventor Koichi Tonai

Koichi Tonai 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).

  • Impact absorbing device
    Patent number: 4272114
    Abstract: An impact absorbing device comprising a hollow polyhedral body formed with a plurality of elongated cutouts in each of its side walls. These cutouts extend in parallel relation in a direction substantially orthogonal with respect to the longitudinal axis of the polyhedral body, and each cutout has one of its longer edges protruding outward and the other longer edge protruding inward. The polyhedral body is subjected to deformation or partial breakage to absorb an impact imparted to a vehicle as when the vehicle collides against another. The device may be combined with a conventional shock absorber to enhance the effect of impact absorption.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: June 9, 1981
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tomoyuki Hirano, Akira Yamanaka, Koichi Tonai
  • Deformable impact absorbing device for vehicles
    Patent number: 4190276
    Abstract: An impact absorbing device comprising a hollow polyhedral body formed with a plurality of elongated cutouts in each of its side walls. These cutouts extend in parallel relation in a direction substantially orthogonal with respect to the longitudinal axis of the polyhedral body, and each cutout has one of its longer edges protruding outward and the other longer edge protruding inward. The polyhedral body is subjected to deformation or partial breakage to absorb an impact imparted to a vehicle as when the vehicle collides against another. The device may be combined with a conventional shock absorber to enhance the effect of impact absorption.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: February 26, 1980
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Tomoyuki Hirano, Akira Yamanaka, Koichi Tonai