Rotational control apparatus

  • US 5,613,586 A
  • Filed: 02/25/1994
  • Issued: 03/25/1997
  • Est. Priority Date: 02/25/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. Rotational control apparatus comprising, in combination:

  • a friction disc rotatable about an axis, with the friction disc having a first surface and a second, opposing surface;

    an output, with the friction disc being rotatable relative to the output about the axis, with the output having a friction ring for engagement with the first surface of the friction disc and a surface parallel to but spaced from the second surface of the friction disc;

    means for rotatably fixing the friction ring to the output while allowing the friction ring to be axially displaceable relative to the output between an engaged condition and a disengaged condition with the friction disc;

    means for moving the friction ring between the engaged and disengaged condition; and

    an eddy current drive including permanent magnets mounted to one of the second surface of the friction disc and the surface of the output and a ring of magnetic material mounted to the other of the second surface of the friction disc and the surface of the output, with the output being driven either with the friction disc when the friction ring is in the engaged condition or at a rotational speed less than the friction disc when the friction ring is in the disengaged condition by the eddy current drivel with the output being in the form of first and second shell housings secured together to define an interior, with the friction disc, the friction ring and the eddy current drive located inside the interior of the first and second shell housings and protected thereby from the environment or other outside forces.

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