| 摘要 |
The underlay (30) comprises a flexible surface layer, rollers along each length side for rolling up the opposing side regions of the surface layer and moving the surface layer backwards and forwards in the lateral direction, and a drive device for the rollers. The surface layer and rollers are divided into length sections (30A-30C) which are pivotally connected via the rollers to enable the underlay to be used on beds (60) with adjustable angle sections. |
