Abstract: The hydraulic lifting provision for the mounting of a crane jib comprises two lift provisions disposed successively at a distance, where each lift provision comprises two base frames rising up from the trailer and disposed at a distance from each other and in each case a tiltable lift arm is disposed at the free end. The free ends of the lift arms are in each case hingedly connected via a cross-frame, where the support for the crane jib is disposed in each case on the cross frame. The cross frames with the supports disposed thereon are tiltable to the side by way of a different operating action of the hydraulic cylinders engaging them. In addition, the supports are constructed shiftable to the sides along the cross-frames by way of a corresponding disposition of additional hydraulic cylinders.

Abstract: A movable frame slidably supported on a mobile chassis, pivot points on each of opposite sides of the movable frame, a pair of extendable members pivotally mounted at one end to each of said pivot points, the other ends of each extendable member being pivoted at spaced points on the chassis and means for individually and independently actuating the extendable members to position the movable frame about the top side of the chassis. The movable frame can rotatably support a load-carrying table and polytetrafluoroethylene plates may be used as bearing surfaces between the chassis and the movable frame and the movable frame and the rotatable table.