Crane with undercarriage with movable supporting legs and an auxiliary supporting leg for temporarily taking over the carrying load of the supporting legs for the purpose of moving the undercarriage

摘要

Hoisting crane, comprising a hoisting body (1) supported by an undercarriage (2), which undercarriage is provided with at least three supporting legs (4), each provided with an up and down movable supporting surface (3), each of which is substantially horizontal movement plane can be rotated independently of each other and can be varied in effective length. The underframe is furthermore provided with at least one auxiliary support leg (6) provided with an upwardly and downwardly movable supporting surface (5) which is rotatable in an essentially horizontal movement surface and can be varied in effective length. Furthermore, the crane is provided with control and driving means with the aid of which the supporting legs and the at least one auxiliary supporting leg can be independently rotated to the left and to the right and can be varied in effective length and their respective supporting surfaces can be moved up and down, the base and the crane can be moved step by step.