| 摘要 |
An ambulatory wheelstand includes a user support structure pivotably attached to a wheeled frame. The frame includes a pair of large diameter drive wheels and a pair of front castor wheels. The user support structure includes hinge pins which are entrained in elongated horizontal slots in the frame. A pivot arm also connects the support structure to the frame so that the structure can pivot between an upright and a prone position. As the support structure is lowered to a prone position, the hinge pin slides rearwardly in the elongated slot to prevent the center of gravity from shifting too far forward. Conversely, when in the upright position, the hinge pin slides to the forward end of the slot, maintaining the center of gravity in substantially the same position. |
