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Mid-wheel drive power wheelchair

  • US 5,944,131 A
  • Filed: 11/12/1996
  • Issued: 08/31/1999
  • Est. Priority Date: 07/03/1996
  • Status: Expired due to Term
First Claim
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1. A power wheelchair comprising:

  • a. a frame;

    b. a seat supported on the frame, the seat having a cushion portion and a back portion for respectively supporting a person'"'"'s thighs and buttocks and a person'"'"'s back when the person is in a seated upright position;

    c. a pair of drive wheels positioned on opposite sides of the frame and rotatable about transverse axes positioned below a central portion of the cushion of the seat;

    d. drive means for causing rotation of the drive wheels for powered movement of the wheelchair;

    e. means for controlling the rotation on the drive wheels by the drive means;

    f. at least one idler wheel connected to the frame and positioned behind the drive wheels and rearward of the back portion of the seat, the idler wheel mounted for rotation about a horizontal axis and supported for rotational movement about a vertical axis;

    g. anti-tip idler wheels positioned forward of the drive wheels and the cushion portion of the seat, the forward anti-tip idler wheels positioned off the ground when the drive wheels and rear idler wheels are in their normal ground engaging position on level ground; and

    h. a resilient suspension supporting the idler wheels forward of the front portion of the frame.

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