Abstract: The present invention relates to a telescopic boom with at least one outer structure and at least one inner structure, each of which is designed as a hollow section with upper flange and lower flange, the upper flange having a half-basket profile with two rounded edges to which the lower flange is joined with a liner of an essentially U-shaped profile, and each structure being mounted on the adjoining structure with a front and a back bearing. To achieve a stable bearing of the structures and a great usable extension length with this boom under high force level, the invention proposes that the front bearing has a slide element in the area between the lower flanges only in the region of the curvature, and the back bearing has a separate plain bearing half liner in the area between the upper flanges only in the region of each rounded edge.

Abstract: A telescopic boom contains a multistage hydraulic cylinder for extending and retracting the boom parts. The telescopic boom is characterized in that a first component of a supporting device is secured to at least one cylinder and in that a second component of the supporting device is secured to a least one telescopic boom part. The second component co-operates with the first component to support the hydraulic cylinder on the boom parts. The first component of the supporting device is shaped as two opposing claws and the second component is shaped as two opposing rails or rail sections. The claws grasp the rails or rail sections, and the rails or rail sections are provided on the inner wall part of the boom part.

Abstract: A device for driving, guiding and steering a vehicle wheel comprises a link-guided shock-absorbing cylinder through which a hydraulic oil passage extends. The hydraulic oil passage feeds a hydraulic motor which is provided in the area of the wheel hub and which acts on a shift transmission that is also provided in the hub area. The wheel hub is substantially arranged at the level of the vehicle frame which supports a transverse bar on which the upper end of the shock-absorbing cylinder is movably supported.

Abstract: The present invention relates to a rotary passage for passing liquids and/or other media between a rotary member (1) and a stationary member (2). The rotary passage according to the invention is characterized in that the rotary member (1) and the stationary member (2) comprise hollow-cylindrical sections (59, 10, 16) respectively lamellarly interlaced in pairs, with two rotary passage stages being formed in that sliding surfaces (3, 3', 4, 4') have provided thereon a plurality of horizontal annular channels (6, 11) which extend in parallel with each other and which respectively interconnect feed lines (7,1 2) of the rotary member (1) to discharge lines (8, 13) of the stationary member (2), and that all of the annular channels (6, 11) of the two rotary passage stages have each assigned thereto upper and lower insulation means (14, 15) on the sliding surface (3, 4).

Abstract: A crane vehicle which reaches a minimum traveling speed of 62 km/h on public roads and gives the vehicle driver a range of vision with a radius of not more than 12 m comprises a vehicle frame which is substantially lowered to the level of the centers of the vehicle wheels, with at least part of the vehicle wheels being provided with hydrostatic individual wheel drives that are respectively arranged in the area of the wheel hubs. Furthermore, the crane vehicle comprises motor means for travel operation and crane operation, with said motor means being supported above the vehicle frame in a turntable which is supported on the vehicle frame in a horizontally pivotable manner. When viewed in the direction of travel, a driver's cab is mounted upstream of the motor means on the turntable, and a split longitudinal spindle which is mechanically lockable with the steering means for the vehicle wheels for travel operation is provided in the area of the driver's cab.