| 摘要 |
A propulsion unit for a wheelchair wherein the wheelchair has a pair of large diameter wheels of the type having a circular handrail. The propulsion unit comprising a body having a front portion, a rear portion and a handle, at least three rollers pivotally mounted to said body, front and rear friction elements positioned in said front and rear portions of said body respectively. When the handle is pressed forward the wheel is propelled forward and when the handle is pressed rearward the wheel is propelled rearward. |
