| 摘要 |
<p>The collapsible invalid chair has its seat mounted on the framework between two large diameter main wheels. At front and rear is a single castor wheel of small diameter, able to swing about a vertical axis. The frame hinge about an axis at the centre of the main wheels. The seat is supported by a vertical front frame attached near the rear of the front horizontal frame, and by a vertical rear frame. The latter is attached near the middle of the rear horizontal frame.</p> |
