| 摘要 |
A wheelchair is disclosed herein. The wheelchair includes a base frame extending in a fore-aft direction and a lateral direction perpendicular to the fore-aft direction. The wheelchair also includes a plurality of wheels supporting the base frame for movement. The wheelchair also includes a seat frame operable to support a seat and a wheelchair occupant sitting in the seat. The wheelchair also includes a support assembly interconnecting the seat frame to the base frame for pivoting movement between an upright position, a fully-tilted position and an intermediate position between the upright position and the fully-tilted position. The support assembly utilizes a plurality of control paths to direct the seat frame in translating and rotating planar body motion that defines a fixed centrode. A center of gravity of the seat frame and the seat and the wheelchair occupant is definable in operation. In one aspect of the present disclosure, the plurality of control paths are arranged such that the center of gravity is directable during pivoting movement of the seat frame along a follower path being at least one of substantially horizontal and concave with the center of gravity vertically lower in the intermediate position than in at least one of the upright position and the fully-tilted position. In another aspect of the disclosure, the seat frame is adjustably positionable relative to the base frame in the fore-aft direction such that the position of the center of gravity is settable through adjust along a single axis to create an alignment of the center of gravity with the fixed centrode and thereby creates stability within the limits of the range of motion of the system. |
