Abstract: The invention relates to a locking system for a telescopic crane jib, in particular for a mobile crane, in which a lock is established between a telescoping cylinder (10, 20) and a telescopic part (1-4) by means of a locking unit (21) in order to extract and retract the telescopic parts, and the locking unit (21) is disposed on the telescoping cylinder (10, 20) in such a way that it can be moved longitudinally.

Abstract: A support device for a mobile lifting machine, in particular a vehicle crane, comprises a carrier support coupled to the vehicle chassis, a piston rod coupled to the carrier support and movable relative to the carrier support, and a support disc coupled to the piston rod, wherein the support device is configured such that it allows a movement of the support disc relative to the carrier support in a direction perpendicular to the longitudinal axis (L) of the piston rod.

Abstract: A method of installing and removing concrete blocks involves using handling device that is equipped with means for attaching and suspending a concrete block and which itself comprises a protective barrier placed temporarily on the concrete block to safeguard the operations of detaching or attaching this block. The barrier advantageously has safeguarded lateral access of the safety bow type that comes into register or alignment with rungs with which the concrete blocks are equipped. The method keeps an operator safe while installing and removing stackable concrete blocks, particularly an operation in which the concrete blocks are stacked on a base chassis of a tower crane.

Abstract: A crane jib system having a main jib, an auxiliary jib, and a telescoping cylinder. The main jib is comprised of main telescoping portions and the auxiliary jib is attached to the main jib and comprises auxiliary telescoping portions. The telescoping cylinder has a first telescopic part locking unit disposed on a base portion of the telescoping cylinder. The first telescopic locking unit is adapted to selectively engage the main telescoping portions. A second telescopic part locking unit is disposed on the telescoping cylinder above the first telescopic part locking unit. The second telescopic part locking unit is adapted to selectively engage the auxiliary telescoping portions.

Abstract: A device for detecting and monitoring an assembled counterweight on a crane includes a turntable steelwork construction comprising a counterweight cylinder; a sensor which is arranged in the region of a connection between the counterweight cylinder and the turntable steelwork construction; and a computational unit (8), wherein the sensor is connected to the computational unit, and the computational unit comprises a logic which determines a weight of a counterweight which can be connected to the turntable steelwork construction from data which are captured by the sensor and transmitted to the computational unit.

Abstract: The invention relates to a system for bracing a telescopic crane, in particular a mobile crane, with a bracing unit which can be mounted on the jib. The bracing unit comprises erectable bracing supports and a holding frame for securing the bracing unit to the jib. The holding frame has a cross-section which is open at the top and allows the jib to be inserted from above the bracing unit The invention also relates to a method of positioning and mounting such a bracing unit on the jib of a telescopic crane.

Abstract: A self-propelled work machine, in particular a mobile crane, comprises an undercarriage configured for moving the work machine, a superstructure which is rotatably mounted on the undercarriage, and a drive device comprising a drive motor. The drive device comprises a moment transmission which is formed between the superstructure and the undercarriage and configured to transmit power outputted by the drive motor between the superstructure and the undercarriage in the form of a moment. At least one and, in particular, all of the elements to be driven receive a moment about an axis which extends in the region of a rotary bearing of the superstructure and the undercarriage, in particular about the rotational axis of the superstructure.

Abstract: A jib part (10) for a crane, in particular a mobile crane, a includes an inner shaping shell (15), tensile elements (11) within hollow profiles (12) and a sheathing, made from a layer of transverse fibers (13) covered by a protective or slide layer (14). The tensile elements (11) are biased and fitted with sensors and/or actuators.

Abstract: A support device for a mobile lifting machine, in particular a vehicle crane, comprises a carrier support coupled to the vehicle chassis, a piston rod coupled to the carrier support and movable relative to the carrier support, and a support disc coupled to the piston rod, wherein the support device is configured such that it allows a movement of the support disc relative to the carrier support in a direction perpendicular to the longitudinal axis (L) of the piston rod.

Abstract: A rotary position transducer assembly for a rotary connection on a work machine, between a first rotary element and a second rotary element, includes a rotary position transducer and a roll-off element coupled to the rotary position transducer, configured to roll off on the circumferential area on the first rotary element. The rotary position transducer detects a rotational movement about a first rotational axis of the roll-off element. The rotary position transducer assembly further includes a bearing securing the roll-off element to the second rotary element such that the roll-off element can be translationally adjusted to vary a distance between the roll-off element and the first rotary element.

Abstract: A height access device enables motorized access to the driving station of a tower crane atop a mast formed of superposed mast elements. It includes a lift cabin installed inside the mast of the crane and movable vertically along the mast. The height access devices further includes a working platform positioned above and separably connected to the lift cabin. A coupling device provides a non-permanent connection of the working platform to the lift cabin and immobilizes the working platform relative to the mast at a required height. The height access device enables the crane driver to ascend and descend with the lift cabin alone when disconnected from the working platform and with the lift cabin and working platform together, particularly during the assembly and dismantling of the mast.

Abstract: A crane jib system having a main jib, an auxiliary jib, and a telescoping cylinder. The main jib is comprised of main telescoping portions and the auxiliary jib is attached to the main jib and comprises auxiliary telescoping portions. The telescoping cylinder has a first telescopic part locking unit disposed on a base portion of the telescoping cylinder. The first telescopic locking unit is adapted to selectively engage the main telescoping portions. A second telescopic part locking unit is disposed on the telescoping cylinder above the first telescopic part locking unit. The second telescopic part locking unit is adapted to selectively engage the auxiliary telescoping portions.

Abstract: The invention relates to a method of determining changes in loads on lifting gear, whereby a change in load is determined within load curve data at a transition point of the load curve gradient, and whereby the load curve is broken down into discrete-time observation intervals at the transition points. It further relates to a method of reconstructing load situations on lifting gear, for which such a method of determining changes in load is used.

Abstract: The invention relates to an electro-hydraulic leak compensating device for a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor (5) coupled with a lifting unit (6,7), a lowering brake valve (4) and a mechanical brake (9), with a pressure sensor (13) which measures the hydraulic pressure prevailing on the load side of the hydraulic motor (5) in the hydraulic circuit and on the side of the lifting conduit (3) before the mechanical brake (9) is closed, in particular immediately before it is closed, as well as a method of electro-hydraulically compensating for leaks of a mobile crane lowering brake system in an open hydraulic circuit with a hydraulic motor (5) coupled with a lifting unit (6,7), a lowering brake valve (4) and a mechanical brake (9), comprising the following method steps: measuring the hydraulic actual pressure prevailing on the load side of the hydraulic motor (5) before the mechanical brake (9) is closed, in particular immediately before it is closed; determ

Abstract: A telescopic crane jib part has a top profiled part and a bottom profiled part joined together at joining points. The top profiled part and the bottom profiled part, on a side of the cross-section defining one-half of the cross section that is symmetrical with respect to the vertical mid-plane, each comprise, starting from the joining point of the profiled parts, at least a less pronounced outwardly curved segment and a more pronounced outwardly curved segment. Mutually adjoining end segments of the top and bottom profile parts meet at the joining points and extend outwards forming an angle.