The invention relates to a crane which is arranged through its reeving system to manoeuvre a load. The crane comprises an upper support structure, a lower support structure arrranged to carry a load and six reeving cables suspending the lower support structure from the upper support structure. There are incorporated means 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 trapezium, respectively, the reeving cables being 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 attitude 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' being present in the connection between the upper and lower support structures when all cables are in tension.
展开▼