Patents by Inventor Shigehiro Saitou

Shigehiro Saitou 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).

  • Backflow prevention device for in-line screw injection molding machine
    Patent number: 7241132
    Abstract: A screw tip is provided in front of a screw with a shaft interposed therebetween, and a check ring is fitted around the shaft. The check ring is separated from a front end portion of the screw when the screw is rotated in a forward direction. The check ring contacts the front end portion of the screw when the screw is advanced. A front end surface of the check ring is provided with teeth, and a rear end surface of the screw tip is provided with grooves with which the respective teeth are engaged. Respective one side surfaces of the grooves and the teeth which are pressed against each other when the screw is rotated in the forward direction are formed vertical to the front end surface of the check ring, and side surfaces thereof located on the reverse sides of the above respective one side surfaces are inclined.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: July 10, 2007
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Haruyuki Matsubayashi, Keisuke Mori, Shigehiro Saitou
  • Backflow prevention device for in-line screw type injection molding machine
    Publication number: 20050129802
    Abstract: A screw tip is provided in front of a screw with a shaft interposed therebetween, and a check ring is fitted around the shaft. The check ring is separated from a front end portion of the screw when the screw is rotated in a forward direction. The check ring contacts the front end portion of the screw when the screw is advanced. A front end surface of the check ring is provided with teeth, and a rear end surface of the screw tip is provided with grooves with which the respective teeth are engaged. Respective one side surfaces of the grooves and the teeth which are pressed against each other when the screw is rotated in the forward direction are formed vertical to the front end surface of the check ring, and side surfaces thereof located on the reverse sides of the above respective one side surfaces are inclined.
    Type: Application
    Filed: November 24, 2004
    Publication date: June 16, 2005
    Inventors: Haruyuki Matsubayashi, Keisuke Mori, Shigehiro Saitou