| 摘要 |
<p>An adjustable bed comprises a head end, a foot end, and a planar mattress portion extending therebetween. The head end and foot end each feature a drive screw (32) and a nut housing (30). Each head end and foot end also features tubes which are slidingly received within the head end and the foot end. The tubes are attached via cables (24) to the nut housing (30). Upon rotation of the drive screw (32), the nut housing (30) rises or descends, thereby adjusting the height of the bed. The translational movement of the nut housing (30) along the drive screw (32) is limited by a drive screw pin (38) at the upper and lower extremities of the drive screw (32). The drive screw pin (38) selectively engages a similar slip nut pin (50, 54) located on a slip nut (44) which is received within the nut housing (30). Frictional force between the slip nut (44) and the nut housing (30) is maintained by a pair of pressure plates (66) which are compressively received within the nut housing (30). The compressive force between the slip nut (44) and the nut housing (30) is adjusted by means of a pair of set screws (76) and springs (70). <IMAGE></p> |
