| 摘要 |
<p>A wheeled chair including a main frame, a pair of large wheels affixed to and supporting the main frame, and a pair of small wheels pivotally mounted to and supporting the main frame. The wheeled chair further comprises a seat frame and an adjustable support device for adjustably supporting a rear portion of the seat frame on a rear portion of the main frame in a plurality of vertical positions. The wheeled chair further comprises a first selectively operable pivot for pivotally supporting a forward portion of the seat frame on a forward portion of the main frame. The wheeled chair further comprises a second selectively operable pivot for pivotally supporting the seat frame on the main frame. The second selectively operable pivot means is located between the forward portion of the seat frame and the rear portion of the seat frame. The seat frame can thereby be selectively pivoted about one or the other of the first and second selectively operable pivots.</p> |
