| 摘要 |
A back support (1), preferably a lumbar support, for a seat such as a motor-vehicle seat, is generally hourglass- or butterfly-shaped and is constituted by two symmetrical, complementary portions (3). Each portion is supported on one of the uprights (7) of the backrest (B) by a horizontal tie (4) which extends through a hole (11) in a flap (8) which is articulated (9) to the outer end of the respective complementary portion (3). Traction means, such as flexible- or Bowden-cable controls (13), enable the free ends of the flaps (8) to be pulled outwardly. The movement apart of the free ends of the flaps (8) thus achieved urges the outer ends of the complementary portions (3) forwardly, modifying the horizontal profile of the support (1) towards a more concave condition and increasing the lateral restraint achieved by the backrest (B). <IMAGE> |
