Patents Assigned to Kowa Shoji, Ltd.
  • Sliding displacement detecting apparatus
    Patent number: 4582183
    Abstract: In a disclosed displacement detecting apparatus, a nut member retains a plurality of balls to circulate therein while in engagement with a helical groove of a screw shaft. The nut member is unrotatable and linearly movable, and the screw shaft is rotatable and linearly immovable. A rotation detector and a brake are attached to the screw shaft. The nut member may act as a piston of a cylinder in which the nut member is mounted, or may be connected to a separately provided piston of the cylinder.
    Type: Grant
    Filed: May 31, 1983
    Date of Patent: April 15, 1986
    Assignee: Kowa Shoji, Ltd.
    Inventor: Takeshi Kuroda
  • Fluid pressure actuator
    Patent number: 4509408
    Abstract: A piston member is mounted in a cylinder body to be axially movable and unrotatable relative thereto. A ball nut retaining balls is fixed to the piston member, and a screw shaft having a helical groove in engagement with the balls is mounted to be rotatable and axially immovable relative to the cylinder body. The screw shaft makes many rotations when the piston under fluid pressure slightly advances axially inside the cylinder.
    Type: Grant
    Filed: April 20, 1983
    Date of Patent: April 9, 1985
    Assignee: Kowa Shoji, Ltd.
    Inventor: Takeshi Kuroda