Patents by Inventor Kyoshi Kawamoto

Kyoshi Kawamoto 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).

  • Linear actuator with abutment stoppers
    Patent number: 6670734
    Abstract: A linear actuator includes a screw shaft rotatably supported within a housing with play in motion in the axial direction of the screw shaft, and a cushioning stopper disposed between the housing and the screw shaft and elastically deformable to absorb a force acting from the screw shaft to the housing when the screw shaft is forced to move relative to the housing in the axial direction within the range of the play at an abutment of a rod with an obstacle or stopper. When the rod is stopped moving, the motor current increases with the degree of elastic deformation of the cushioning stopper. An overload sensor cuts off the supply of power to an electric motor when excessive current in the motor is detected.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: December 30, 2003
    Assignee: Tsubakimoto Chain Co.
    Inventors: Satoshi Morishima, Kyoshi Kawamoto, Yutaka Kobayashi
  • Linear actuator with abutment stoppers
    Publication number: 20020074866
    Abstract: A linear actuator includes a screw shaft rotatably supported within a housing with play in motion in the axial direction of the screw shaft, and a cushioning stopper disposed between the housing and the screw shaft and elastically deformable to absorb a force acting from the screw shaft to the housing when the screw shaft is forced to move relative to the housing in the axial direction within the range of the play at an abutment of a rod with an obstacle or stopper. When the rod is stopped moving, the motor current increases with the degree of elastic deformation of the cushioning stopper. An overload sensor cuts off the supply of power to an electric motor when excessive current in the motor is detected.
    Type: Application
    Filed: December 6, 2001
    Publication date: June 20, 2002
    Inventors: Satoshi Morishima, Kyoshi Kawamoto, Yutaka Kobayashi