| 摘要 |
A drawbar construction for a semitrailer is provided, by means of which the pulling device, such as a tractor, and the trailer form a rigid vehicle combination. This rigid vehicle combination is applicable especially in loading timber, whereby an effective lifting crane can be mounted on the trailer without the risk of insufficient stability exerted by the laterally extending crane. The drawbar construction comprises a rigid drawbar part extending from the trailer and a connection shaft which connects the rigid drawbar part to the pulling vehicle. The rigid drawbar part and the connecting shaft are interconnected by means of a first joint which is turnable only in the horizontal plane. The second joint connecting the connecting shaft to the pulling device is essentially of the same construction as the first joint but turnable only in the vertical plane. The drawbar construction includes preferably also a rotation joint. The supporting effect of the drawbar to the trailer can be essentially increased by means of a double action hydraulic cylinder, which locks the movement of the drawbar at the second joint in the vertical plane. |
