Mid-wheel drive wheelchair

  • US 6,196,343 B1
  • Filed: 10/25/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 10/23/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A mid-wheel drive wheelchair comprising:

  • a central base frame, a seat or chair frame attachable to said base frame, a pair of leading pivot arms pivotally supported on opposite sides of said base frame for independent pivotal movement relative to the base frame about a common transverse pivot axis, each said pivot arm extending forwardly of the front end of the base frame, a mid-drive wheel mounted for rotation on each of said pivot arms adjacent its trailing end, with the axle of each drive wheel being located a short distance rearwardly of the common transverse pivot axis of said pivot arms, a pair of ground engaging front castor wheels respectively mounted at the leading ends of said pivot arms, spring means respectively acting between each said pivot arm and an adjacent side portion of the base frame, said spring means, in use, being arranged to resist pivotal movement of its associated said pivot arm and to allow the base frame to tilt under spring pressure with respect the pivot arms, and a pair of transversely spaced apart ground engaging rear castor wheels movable supported with respect to said base frame.

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