A telescopic jib bracing unit for a mobile crane includes a holding frame which is embodied for fastening to the telescopic jib of the mobile crane and exhibits an open cross-section, the cross-sectional opening of which enables the jib to be retracted into the holding frame, and two bracing supports which are connected by the holding frame to form a structural unit. Two frame parts which form the open cross-section of the holding frame are coupled to each other via a coupling point such that they can be moved with respect to each other. A bracing unit transport system, a mobile crane and a fitting method are also provided.

A vehicle crane having a luffable main jib and an additional jib system arranged on a free end section of the main jib and comprising a first additional jib part and a second additional jib part. To further reduce the weight of the additional jib system and the vehicle crane fitted therewith, and to permit an overall more economical mode of production, the first additional jib part has a rectangular cross-section having four longitudinal chords connected together via transverse struts or/and diagonal struts and the second additional jib part has a triangular cross-section having three longitudinal chords connected together via transverse struts, wherein the two additional jib parts are coupled, or can be coupled, together via a cross-section change adapter.

A telescoping jib of a mobile crane includes sections that telescope out of a jib housing from a transport position into an operating position. A guying system has successively connected tension rods extending from the jib housing to at least one of the extended telescoping jibs by at least one guying support. The mobile crane provides a lighter construction and improved road handling, and an increased load capacity for unchanged telescoping jib measurements. To this end, a guide holder arranged on the jib housing receives the tension rods in the transport position and, in the operating position, at least one movable tension rod on one of the guying supports is respectively securely connected to the outer end of a telescoping section head in an articulated manner and can be secured to a holding mechanism on the opposite end on an adjacent guying support of an adjacent telescoping section head.

An apparatus for maintaining a wind turbine generator includes at least, but is not limited to, a wind turbine connected to a wind turbine generator, the wind turbine generator is supported by a generator platform, a gearbox disposed between the wind turbine and said wind turbine generator, and a break assembly disposed between the gearbox and the wind turbine generator. The generator platform provides at least one maintenance stud adjacent the wind turbine generator, which is used to secure a portable crane to the generator platform. The portable crane includes at least, but is not limited to, a support member secured to a mounting plate, the support member extends from the mounting plate in an upward direction and at an angle that is less than a ninety degree angle relative to said mounting plate.

The invention relates to a crane, in particular to a mobile crane, comprising a lattice boom, a derrick boom, and a boom guying led from the derrick boom to the boom tip, wherein at least one guying frame is provided that is fastened to the boom between the derrick boom and the boom tip and is connected to the boom guying.

A mounting framework of a vehicle crane in which at least one bracing arm of a bracing apparatus of the vehicle crane can be temporarily stored on the mounting framework, where the mounting framework comprises at least one displaceable sliding frame and a single bracing arm can be temporarily stored on the sliding frame. In order to provide a mounting framework of a vehicle crane with an optimized placing option for a bracing apparatus on the lower carriage, the mounting framework comprises one displaceable sliding frame. A vehicle crane is configured with such a mounting framework and embodiments include a method for mounting a bracing apparatus on a telescoping jib of a vehicle crane comprising such a mounting framework.

To reduce the number of places where dimension control regarding an attachment position of a coupling portion to a structure is required. A first coupling portion includes a first pin receiving portion into which a coupling pin can be inserted, and a load transmitting portion integrally provided with the first pin receiving portion. A second coupling portion includes a second pin receiving portion into which the coupling pin can be inserted, and a load receiving portion integrally provided with the second pin receiving portion. The first pin receiving portion and the second pin receiving portion match with each other so as to detachably attach the coupling pin in a state where the load transmitting portion and the load receiving portion are in contact with each other.