Abstract: A tower crane, and in particular a hammerhead crane, having at least one crane operator elevator, wherein the at least one crane operator elevator is arranged inside the rectangular cross section of the crane tower.

Abstract: The invention relates to a method of operating a crane having a luffable crane boom and having a trolley travelable at the crane boom, wherein the crane can be operated in a luffing mode, on the one hand, and in a trolley mode, on the other hand. In accordance with the invention, a switch is made between a luffing mode and a trolley mode by varying the hoist rope reeving. The invention further relates to such a crane for carrying out the method.

Abstract: The present invention relates to a climbing device for a revolving tower crane having a climbing frame movable along, the crane tower for climbing in and/or climbing down tower sections, wherein a guide is provided for the longitudinally movable support of the climbing frame with respect to the crane tower. In accordance with the invention, the guide has resiliently flexibly supported and/or resiliently flexible transverse support elements transversely to the travel direction of the climbing frame.

Abstract: The present invention relates to a tower crane with a tower of at least one tower element, in particular lattice piece, and a structural guying with at least one guy rod for the horizontal anchorage of the tower at a structure, wherein the at least one guy rod of the structural guying is attached or attachable to an attachment point of the tower element.

Abstract: An apparatus (1) for assembling or dismantling a crane has a coupling unit (11) for coupling with a tower part (3). The coupling unit (11) can be moved into a latching position or into an unlatching position. The coupling unit (11) furthermore has counterweights (110) for setting a center of gravity of the crane.

Abstract: A crane, in particular a tower crane, with a boom rotatable about an upright slewing gear axis and an out-of-service brake which permits and slows down the rotary movements of the boom in the out-of-service condition. The out-of-service brake is formed to operate in a rotational-speed-dependent manner such that with a greater rotational speed of the crane the applied braking torque is greater than with a smaller rotational speed of the crane.

Abstract: The present disclosure concerns a crane, in particular a tower crane, with a jib from which a load hook can be raised and lowered via a hoisting cable, and with an electric power supply to the load hook and/or to a trolley that may be movable along the crane jib. According to the disclosure, the electric power supply to the load hook and/or to the trolley is at least partly conducted by a running cable which transmits tractive forces for the crane operation.

Abstract: The invention relates to a method of operating a crane having a luffable crane boom and having a trolley travelable at the crane boom, wherein the crane can be operated in a luffing mode, on the one hand, and in a trolley mode, on the other hand. In accordance with the invention, a switch is made between a luffing mode and a trolley mode by varying the hoist rope reeving. The invention further relates to such a crane for carrying out the method.

Abstract: The present disclosure relates to a self-propelled surface milling cutter, with a working assembly comprising a rotatingly drivable drum body, and at least one drum drive unit which is accommodated in the interior of the drum body and forms at least part of a rotatable bearing of the drum body on a drum supporting frame, wherein the at least one drum drive unit includes a stationary drive part attached to the drum supporting frame and a rotatable drive part connected with the drum body. The rotatable drive part of the drum drive unit is mounted on the drum body by a positive entrainment connection in a torque-transmitting, but longitudinally movable manner. The entrainment connection rotatorily entrains the drum body, in order to be able to transmit the rotary drive movements of the drive part to the drum body.

Abstract: The present invention relates to an electric tracklaying gear and the use thereof for a self-propelled working machine, preferably for a construction or earth-moving machine or a surface mining machine such as Surface Miner, which includes an endlessly circulating track chain which can be driven by a crawler drive that is arranged inside the path of circulation of the track chain. It is proposed to associate a cooling device with a closed fluid cooling circuit to the electric motor of the crawler drive arranged in the interior of the path of circulation of the track chain. Due to the high thermal capacity of a suitable cooling fluid such as oil or water-glycol mixture small volumetric flow rates in the fluid cooling circuit and hence small conduit cross-sections are sufficient. On the other hand, due to the closed formation of the fluid cooling circuit any dust input into the crawler drive and also any generation of dust by exhaust air can be avoided.

Abstract: The present invention relates to a crane, in particular a tower crane, with a boom rotatable about an upright slewing gear axis and an out-of-service brake which permits and slows down the rotary movements of the boom in the out-of-service condition. According to the invention, the out-of-service brake is formed to operate in a rotational-speed-dependent manner such that with a greater rotational speed of the crane the applied braking torque is greater than with a smaller rotational speed of the crane.

Abstract: The present invention relates to a tower crane with a tower of at least one tower element, in particular lattice piece, and a structural guying with at least one guy rod for the horizontal anchorage of the tower at a structure, wherein the at least one guy rod of the structural guying is attached or attachable to an attachment point of the tower element.

Abstract: The present invention relates to an electric tracklaying gear and the use thereof for a self-propelled working machine, preferably for a construction or earth-moving machine or a surface mining machine such as Surface Miner, which includes an endlessly circulating track chain which can be driven by a crawler drive that is arranged inside the path of circulation of the track chain. It is proposed to associate a cooling device with a closed fluid cooling circuit to the electric motor of the crawler drive arranged in the interior of the path of circulation of the track chain. Due to the high thermal capacity of a suitable cooling fluid such as oil or water-glycol mixture small volumetric flow rates in the fluid cooling circuit and hence small conduit cross-sections are sufficient. On the other hand, due to the closed formation of the fluid cooling circuit any dust input into the crawler drive and also any generation of dust by exhaust air can be avoided.

Abstract: The present disclosure relates to a self-propelled surface milling cutter, with a working assembly comprising a rotatingly drivable drum body, and at least one drum drive unit which is accommodated in the interior of the drum body and forms at least part of a rotatable bearing of the drum body on a drum supporting frame, wherein the at least one drum drive unit includes a stationary drive part attached to the drum supporting frame and a rotatable drive part connected with the drum body. The rotatable drive part of the drum drive unit is mounted on the drum body by a positive entrainment connection in a torque-transmitting, but longitudinally movable manner. The entrainment connection rotatorily entrains the drum body, in order to be able to transmit the rotary drive movements of the drive part to the drum body.

Abstract: The present invention relates to an electric tracklaying gear and the use thereof for a self-propelled working machine, preferably for a construction or earth-moving machine or a surface mining machine such as Surface Miner, which includes an endlessly circulating track chain which can be driven by a crawler drive that is arranged inside the path of circulation of the track chain. It is proposed to associate a cooling device with a closed fluid cooling circuit to the electric motor of the crawler drive arranged in the interior of the path of circulation of the track chain. Due to the high thermal capacity of a suitable cooling fluid such as oil or water-glycol mixture small volumetric flow rates in the fluid cooling circuit and hence small conduit cross-sections are sufficient. On the other hand, due to the closed formation of the fluid cooling circuit any dust input into the crawler drive and also any generation of dust by exhaust air can be avoided.

Abstract: The present invention relates to a self-propelled surface cutter, preferably in the form of an asphalt cutter, a snow cutter or a surface miner, having working equipment including a rotatingly drivable roller body, and having at least one roller drive unit which is received in the interior of the roller body and forms at least one part of a rotatable support of the roller body at a roller carrier frame, wherein the rotatable support of the roller body includes at least two roller bearing arrangements which support the roller body at two roller carrier frame parts engaging around the roller body at the end face, wherein each of the named two roller bearing arrangements on its own forms a statically determined or overdetermined radial and axial support which includes at least two mutually spaced apart bearing points and supports the roller body at the respective roller carrier frame part in an axially and radially fixed manner and/or at a fixed angle to one another so that the roller body overall is supported w

Abstract: The present invention relates to a self-propelled surface milling machine, preferably in the form of an asphalt-milling machine, snow-milling machine or Surface Miner, having a mill roll which is drivable about a rotational axis, and a mill roll drive comprising an electrical motor which is accommodated within the mill roll, wherein stator and rotor of the electrical motor are accommodated within a dust and air-tightly sealed motor housing. It will be suggested to associate a cooling device comprising a closed circuit liquid cooling system to the electrical motor located within the milling roll body. Due to the high heat capacity of a suitable coolant, such as oil or mixed water and glycol small volume flows and hence small conduit cross sections will be sufficient. On the other hand, any incorporation of dust into the mill-roll drive as well as any formation of dust by discharge air can be avoided by the closed form of the circuit liquid cooling system.

Abstract: The present invention relates to a self-propelled working machine, especially in the form of a surface milling machine, such as asphalt-milling machine or snow-milling machine comprising a main operating unit and/or a drive unit, which is operable in a steady-state or near steady-state operating status and is drivable by a drive device comprising at least an electrical motor, the electrical motor being associated with a start-up including a frequency converter for the limitation of starting current. The invention also relates to a process for operating such a self-propelled working machine. According to the invention an operating circuit for steady-state operation is provided, comprising a jumper for bridging the frequency converter following starting or reaching steady-state operational status. Optionally, the jumper is switchable to activate or inactivate the frequency converter of the start-up circuit, respectively.

Abstract: A truck has improved control with a plurality of wheels each having a single wheel drive and a device for controlling speed and/or torque of the single wheel drives. The control device has a separate controller train for each wheel drive, with each controller train having a differential controller for correcting divided torque depending on steering angle and a wheel slip controller correcting the divided torque or torque value corrected by the differential controller depending on wheel slip and providing a corresponding single wheel drive torque value.

Abstract: The present invention relates to a rotor blade adjusting drive for adjusting the pitch angle of a rotor blade of a wind power plant, comprising a drive train which at the output end can be connected with the rotor blade and/or a bearing member supporting the rotor blade, and a spring accumulator connectable with the drive train, which includes a spring accumulator shaft, a spring accumulator housing and a spring means which can be tensioned by rotating spring accumulator shaft and spring accumulator housing relative to each other, wherein the spring accumulator shaft and/or the spring accumulator housing can be uncoupled from the drive train and is rotatable with respect to the same for biasing the spring accumulator, wherein a braking device is provided for retarding and/or holding the spring accumulator shaft and/or the spring accumulator housing against the spring bias in the uncoupled condition of the spring accumulator.