| 摘要 |
A crane comprising a rigid column (1) pivotally mounted on a support structure, an arm section (2) connected to the column and comprising two arms (4, 5) which extend substantially parallel with one another, a maneuvering device (6) which acts between the arms, a rocker arm (3) which is mounted for pivotal movement in one plane on the end of the arm section (2) distal from the column (1) and the free-end of which rocker arm is intended to carry a lifting device, tool or the like, wherein the other ends of the mutually parallel arms are mutually spaced apart and are connected with a yoke (7) for pivotal movement in the aforementioned plane. The invention is characterised by a carrier arm (8) which is connected at one end thereof to the column (1) for pivotal movement in the aforementioned plane and the other end of which carrier arm is oonnected to the arm section (2) for pivotal movement in the aforementioned plane by means of a journal shaft (11,11') separate from the journal shafts of the parallel arms (4, 5) on the yoke (7); in that a first piston-cylinder maneuvering device (9) is mounted between the column (1) and the yoke (7); and in that a second piston-cylinder maneuvering device (10) is mounted between the column (1) and the carrier arm (8).
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