Patents by Inventor Yoshihiko Nagare

Yoshihiko Nagare 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).

  • Reading method of screw rotation angle of hand-held impact wrench, hand-vibration detection method, tightening evaluation method and control method of hand-held power screw loosening tool
    Patent number: 6546815
    Abstract: A hand-held powered screw tightening tool has a detecting device to detect a rotation angle of a rotary member in a clockwise direction and a counterclockwise direction. In screw tightening, an angle obtained by subtracting a cumulative total of the rotation angle of the rotary member with rebound, if any, in a counterclockwise direction from a cumulative total of the rotation angle of the rotary member in the clockwise direction is detected and accumulated as a total rotation angle (P) and a rotation angle formed during the deceleration at the hammering is detected as &Dgr;H and accumulated, and a preset design angle Pd for hammering is accumulated. A wobbling angle is calculated from Equation: A wobbling angle=P−a cumulative total of Pd−a cumulative total of &Dgr;H (where Pd is a design value of the impact wrench, indicating an angle corresponding to 360°/m for the case of the m number of hammerings per rotation of the rotary member).
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: April 15, 2003
    Assignee: Kuken Co., Ltd.
    Inventors: Masakazu Yamada, Ryoichi Shibata, Yoshihiko Nagare
  • Reading method of crew rotation angle of hand-held impact wrench, hand-vibration detection method, tightening evaluation and control method of hand-held power screw loosening tool
    Publication number: 20020134172
    Abstract: A hand-held powered screw tightening tool is provided with a detecting means to detect a rotation angle of a rotary member in a clockwise direction and a counterclockwise direction. In screw tightening, an angle obtained by subtracting a cumulative total of the rotation angle of the rotary member with rebound, if any, in a counterclockwise direction from a cumulative total of the rotation angle of the same in the clockwise direction is detected and accumulated as a total rotation angle (P) and a rotation angle formed in the middle of the deceleration at the hammering is detected as &Dgr;H and accumulated, and a preset design angle Pd for hammering is accumulated. A wobbling angle is calculated from Equation: A wobbling angle=P−a cumulative total of Pd−a cumulative total of &Dgr;H (where Pd is a design value of the powered wrench, indicating an angle corresponding to 360°/m for the case of the m number of hammerings per rotation of the rotary member).
    Type: Application
    Filed: September 14, 2001
    Publication date: September 26, 2002
    Inventors: Masakazu Yamada, Ryoichi Shibata, Yoshihiko Nagare