| 摘要 |
This invention relates to a load-supporting frame. A load-supporting frame has load-supporting means e.g. in the form of filaments stretched across the frame, the filaments being secured at one end to one of the frame sides and at the other end to a variable tensioning device which itself is connected to the opposite frame side. The tensioning device comprises a spinal column of links each secured to one of the filaments and connected at its opposite end to the adjacent frame side by springs. Intermediate the springs is a variable tension coupling comprising a carriage slidable along the flexible column of links, a slider slidable along the frame side, and a screw connection connecting the slider to the carriage and operable to vary the tension in the filaments adjacent thereto. The frame is particularly intended to provide variable-position lumbar support in the back rest of a vehicle seat. |
