| 摘要 |
In the wheelchair (10) embodiment, a foldable frame (12) has a seat for supporting the user and a propulsor (16) movably attached to the frame for allowing the user to pump the propulsor. The propulsor is engaged with both rear wheels (42, 44) of the wheelchair through independent ratchet-clutch mechanisms (62, 64) for permitting torque to be transferred to one or both wheels when the propulsor is pumped to propel and steer the wheelchair. In the three-wheeled skateboard embodiment, a frame has two wheels (214, 216) mounted in tandem near the front of the frame and a third wheel (222) mounted on the centerline of the frame behind the front wheels. Two pedals (226, 228) are hingedly mounted side-by-side on the frame and are ratchetably engaged with the rear wheel. Each pedal is spring-returned (230, 232) to its thrust position. The user can alternately or simultaneously depress the pedals to impart torque to the rear wheel and thereby propel the skateboard. |
