| 摘要 |
The present invention provides a manually operable propulsion unit for the detachable attachment to a wheelchair in which the wheels are arranged to be driven by circular handrails fixedly attached to, concentric with and laterally spaced outside the wheels of the wheelchair so as to facilitate manual propulsion of the wheelchair by means of the back and forwards motion of hand levers in addition to the wheelchair being propellable directly by the handrails. The manually operatable propulsion unit is detachably attachable to the wheelchair and suitably comprises a pair of crossbars each adapted to be detachably attached diametrically across one of the handrails, basebar means adapted to be detachably attached transversely of the frame of the wheelchair, a pair of hand lever bars pivotably mounted about a horizontal axis on the basebar means on either side of the wheelchair, a pair of mounting means each on one of said crossbars extending across the hand rail and a pair of connecting bars each pivotably mounted at either end to said mounting means at a point off-center from the center of the hand rail and to an intermediate point on the hand lever bar such that the back and forwards motion in the vertical plane of each of the hand lever bars drives its associated wheel of the wheelchair via the attached hand rail. The present invention also provides a conversion kit which on erection provides said unit. |
