Patents Assigned to Kabushiki Kaisha Hasegawa Seiko
  • Method for producing ratchet devices
    Patent number: 5463891
    Abstract: A method for producing ratchet devices, the method including the steps of forming a circular recess in a blank metal plate by drawing, compressing the metal plate in a pair of dies so as to reduce the depth of the recess and thicken the side wall thereof, and forming ratchet teeth on and along the inner annular surface of the side wall of the recess.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: November 7, 1995
    Assignees: Kabushiki Kaisha Hasegawa Seiko, Maruei Kogyo Kabushiki Kaisha
    Inventor: Isao Hasegawa