| 摘要 |
<p>An adjustable lumbar support for the backrest of a seat, including an elongate flexible band (3) having first and second ends attachable to sides (9) of a backrest. Drive means (24) is connected to the band (3) so as to tension the band (3) and so decrease the extent to which the band (3) curves rearwardly with respect to the ends thereof. The band (3) includes a plurality of pleats (14, 15), extending transverse to the length of the band (3) and arranged to expand or collapse in response to changes in the longitudinal tension in the band (3). As shown, the pleats (14, 15) form part of a shield overlying a tensionable strap (10). In another arrangement (not shown) the pleats are disposed between and interconnect adjacent relatively rigid rib-like elements. The drive (24) may include a motor (25) driving a screw-threaded spindle arranged at right angles thereto and connected to the band (3) so that the spindle extends in the longitudinal direction of the band (3). A carriage (28) responds to rotation of the spindle (26) so as to tension the band (3).</p> |
