| 摘要 |
<p>The system has two cable circuits, each having a cable (C1,C2) connected between an end of a fixed point (PF1, PF2) and an end of a lifting apparatus (T1,T2) by deflecting pulleys (A1-A3, B1-B3) mounted on two parallel axes of each end of a load support. One of the pulleys turns in a same direction as that of a pulley of another cable circuit by similar actions of lifting or lowering of the lifting apparatus.</p> |
