| 摘要 |
<p>A backrest for supporting a person's back having a front surface and a rear surface has a flexible support section (66) having a fixed end which is mounted to a support structure and a free end which is displaceable vertically with respect to the fixed end, the support section is configured to be compressed and displaced forwardly when the free end is moved towards the fixed end. In one embodiment, an adjustment member (25) is drivingly connected to the free end; and, a detent member for selectively receiving the adjustment member in one of a plurality of positions, the support member biasing the adjustment member into retaining engagement with the detent member due to the compression of the flexible support member by the displacement of the free end towards the fixed end. In another embodiment, a cam mounted off-centre on a shaft controls the compression of the support structure.</p> |
