| 摘要 |
The bed (1) has a lower frame (3) with legs (9) and wheels, and a height adjustment device for adjusting height of an upper frame (4) with respect to the lower frame. The lower frame includes a support (6) on which the legs and the device are fixed, and another support on which the wheels are fixed. The device maintains the upper frame to be isolated from the lower frame at rest when the bed is set at a position on legs. The device arranges the upper frame closer to the lower frame and raises the legs when the bed is set at a position on wheels. |
