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Magnetic cylinder

  • US 4,371,798 A
  • Filed: 03/18/1980
  • Issued: 02/01/1983
  • Est. Priority Date: 03/26/1979
  • Status: Expired due to Term
First Claim
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1. A piston assembly comprising:

  • a slidably mounted piston rod;

    a first magnetic unit mounted to said piston rod so as to be axially movable therewith, said magnetic unit including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod;

    means for rotationally moving said first magnetic unit with respect to the axis of said piston rod; and

    a second fixedly mounted magnetic unit, said second magnetic unit opposing said first magnetic unit and including a plurality of segments of alternating polarity in the direction of rotation about the axis of said piston rod, said first and second magnetic units disposed such that they will attract or repel each other, thereby causing linear movement of said piston rod, when said first magnetic unit is rotated into a selected position.

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