| 摘要 |
An adjustable bed is provided having a lower frame (1) and an upper frame (3) mounted for longitudinal movement on the lower frame. A supporting surface (7, 8, 9, 10), including a back support member (7), is connected to the upper frame for pivotal movement about a transverse axis. The back support (7) is adjustable by an adjustment mechanism comprising two pairs of pivotally interconnected arms (17, 19), one of each pair being also pivoted to the lower frame (1) and the other arm of each pair being pivoted to the upper frame (3). The pivotal interconnections (18, 20) between the arms bear on the underside of the back support members, and a drive mechanism (13, 14, 15, 16) produces longitudinal movement of the upper frame with respect to the lower frame and, simultaneously, vertical movement of the pivotal interconnection (18). |
