| 摘要 |
<p>The assembly has an upper support (14) movable vertically with respect to a base support (12) and interconnected by crossed linkage arms (32, 36). A support arm (56) pivoted to the upper support (14) and biassed by a spring (45) carries a cam (60) at its lower end which engages a roller (62) carried on the base support (12). The roller (62) is mounted for upward and downward adjustment, to raise or lower the seat height, on a ratchet-operated height-adjustment mechanism.</p> |
