Patents Assigned to Kabushiki Kaisha Kuken
  • Impact wrench for tightening to a desired level
    Patent number: 4609089
    Abstract: An impact wrench including a hammer and an anvil to which impacts are imparted by the hammer, the impact wrench comprising a pair of sensors located at a stationary section of the wrench wherein the sensors are electrically arranged so as to have different phases, the sensors being to detect the rebounds occurring on the anvil, a second sensor adapted to detect an angular displacement of the anvil from a time when the rebounds detected by the first sensors exceed a predetermined value, and means for stopping the motor.
    Type: Grant
    Filed: December 27, 1982
    Date of Patent: September 2, 1986
    Assignee: Kabushiki Kaisha Kuken
    Inventors: Takashi Kobayashi, Masaru Mizuhara
  • Impact wrench
    Patent number: 4460049
    Abstract: An impact wrench includes a hammer, an anvil and a rotor driven by a motor, the hammer being swingeable in either direction with respect to the rotary axis of the rotor, the hammer resting on the anvil in a spring-loaded state so as to enable the hammer to line up with the axis of the anvil, the hammer including means for engaging itself with the inside surface of the rotor, whereby the hammer produces impacts at fixed intervals and transmits the same to the anvil.
    Type: Grant
    Filed: January 19, 1982
    Date of Patent: July 17, 1984
    Assignee: Kabushiki Kaisha Kuken
    Inventor: Ryoichi Shibata