| 摘要 |
PCT No. PCT/AU96/00749 Sec. 371 Date Jul. 8, 1998 Sec. 102(e) Date Jul. 8, 1998 PCT Filed Nov. 22, 1996 PCT Pub. No. WO97/19888 PCT Pub. Date Jun. 5, 1997A crane arranged through its reeving system to manoeuver a load. The crane includes an upper support structure, a lower support structure arranged to carry a load and six reeving cables suspending the lower support structure from the upper support structure. Means are provided for changing the effective length between the upper and lower support structure of selective ones of the reeving cables. The reeving cables are arranged such that they are connected geometrically to the upper and lower support structures at apexes of an upper and a lower quadrilateral plane figure, respectively. The reeving cables are arranged such that the cables of a first pair of the reeving cables converge in a downward direction, the cables of a second pair of the reeving cables converge in an upward direction, and the cables of the third pair of reeving cables extend between opposite ends of the first and second pair reeving cables at the upper and lower support structures. A crane with such reeving arrangement enables adjustment of the position and altitude of the lower support structure with respect to the upper support structure by manipulating the length in individual reeving cables. The reeving cable arrangement results in "stiffness" between the upper and lower support structures when all cables are in tension.
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