Mid-wheel drive wheelchair
DCFirst Claim
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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Abstract
The invention provides a mid-wheel drive wheelchair assembly (10) which includes a central base frame (11), a seat frame (12) removably attached to the base frame (11), a pair of transversely spaced leading pivot arms (13, 14) pivotally attached to opposite sides of the base frame respectively for pivotal movement about a common transverse pivot axis (17), a pair of ground engaging mid-drive wheels (19, 20) each mounted adjacent the trailing end of a respective side pivot arm (13, 14), a pair of ground engaging front castor wheels (21, 22) rotatably mounted at the leading ends of the pivot arms (13, 14), and a pair of ground engage rear castor wheels (23, 24) rotatably mounted at opposite ends of a rigid transverse port arm (25) which itself is pivotally mounted to the rear of the base frame (11) centrally thereof. Each of the pivot arms (13, 14) is spring mounted with respect to the base frame by means of coil springs (28, 29) arranged so that any pivotal movement of the arms is cushioned by the coil springs.
182 Citations
8 Claims
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1. A mid-wheel drive wheelchair comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification