| 摘要 |
A power wheelchair is capable of operating in either a two-wheel or a four-wheel drive configuration. The wheelchair includes first and second forward drive wheels in contact a supporting surface. First and second wheel support assemblies each include a support member pivotally connected to the wheelchair frame. Each wheel support assembly further includes a rear drive wheel and a rear non-driven wheel connected to the support member. At least one actuator is provided to control movement of the support members to pivot between a first position and a second position. In the first position, the rear non-driven wheel is moved into contact with the supporting surface and the rear drive wheel is moved out of contact with the supporting surface. In the second position the rear drive wheel is moved into contact with the supporting surface.
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