| 摘要 |
An electrical wheelchair includes a chassis on which a seat is mounted. The chassis has a double-framed structure including a primary frame and a secondary frame pivotally connected to each other so as to be rotatable with respect to each other about a first rotational axis. Two driving wheels are mounted to the primary frame and independently driven by motors. Two rear guide wheels are rotatably and swivellingly mounted to the primary frame. The secondary frame has a front edge frontward extending beyond the primary frame with two front guide wheels rotatably and swivellingly mounted thereto whereby the front guide wheels are capable to orbit about the driving wheels by means of the pivotal connection between the primary and secondary frames so as to provide the front guide wheels and the driving wheels with excellent surface compliance when the wheelchair is moving on an uneven surface. Furthermore, the wheelchair is capable of spinning about its own central axis on both raised surfaces, recessed surfaces, and inclined surfaces.
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