| 摘要 |
<p>A height adjustable device (D) for suspending a planter (P) comprises a locking member (14) mounted above the planter, a handle member (10) and a cable (12) attached at a first end thereof to the planter. The cable (12) passes through the locking member (14) and is wound around a reel (36) biasedly mounted in the handle member (10) with a second end of the cable being attached to the reel. The cable (12) is partly wound around the reel (36). A disengageable brake (54) is provided for the reel (36). The locking member (14) comprises a pair of fixed wheels (70,72) which guide the cable (12) therethrough. The locking member (14) further comprises a locking arm (76) pivotally mounted therein and comprising a series of teeth (78). The locking arm (76) is biased towards a first one (72) of the wheels, whereby the cable (12) can be secured between the locking arm (76) and the first wheel (72). Tension provided in the cable (12) by the handle member (10) forces the locking arm (76) away from the cable thereby releasing the same and allowing free movement thereof through the locking member (14) and thus permitting the planter (P) to be raised and lowered. To secure the cable (12) between the teeth (78) of the locking arm (76) and the first wheel (72), a sudden slack is provided in the cable (12) using the handle member (10) in order to reduce the forces exerted by the cable (12) on the locking arm (76) in such a way that the locking arm is urged towards the wheel (72) to imprison the cable (12) therebetween. The disengageable brake (54) allows the handle member (10) to be positioned at various distances from the locking member (14) by counterbalancing the forces of the biased reel (36) provided in the handle member (10).</p> |
