Patents Assigned to R. J. Ifield & Sons Pty. Limited
  • Hydraulic actuator
    Patent number: RE29000
    Abstract: A hydraulic actuator for producing translational movement over a long distance having two jack cylinders with pistons mounted for reciprocal movement and connected to a worm wheel through a worm gear. When a piston is driving, the worm gear acts as a rack to turn the worm wheel and when a piston is being returned to its starting position the worm gear rotates. Means are provided to alternately switch from one cylinder to the other.
    Type: Grant
    Filed: March 21, 1974
    Date of Patent: October 12, 1976
    Assignee: R. J. Ifield & Sons Pty. Limited
    Inventors: Richard J. Ifield, William R. Ifield