A system for transporting and testing a crane includes a crane, a transporting frame and a foundation. A first connecting mechanism is provided for establishing a releasable connection between the crane and the transporting frame. A second connecting mechanism is provided for establishing a releasable connection between the transporting frame and the foundation. In a starting state, the crane, the transporting frame and the foundation are separate from one another. In a transporting state, the crane is connected to the transporting frame. In a testing state, the crane is connected to the transporting frame and the transporting frame is connected to the foundation. The invention also relates to a corresponding method. The invention makes it possible for the crane to be assembled, and tested, at a site remote from an offshore wind turbine.

A cylinder retraction system causes a crawler side frame hoisting hydraulic cylinder, swingably suspended on a ventral surface side of a lower boom, to swing between a retracted attitude, in which the hydraulic cylinder is set along a ventral surface of the lower boom, and an operating attitude, in which the hydraulic cylinder is oriented along a vertical direction. As the rod of the hydraulic cylinder, currently having the operating attitude, is contracted by a predetermined extent, the rod front end of the hydraulic cylinder is guided by the guiding portion until the hydraulic cylinder takes on the retracted attitude. As the hydraulic cylinder, currently having the retracted attitude, is extended by a predetermined extent, engagement between the rod front end of the hydraulic cylinder and the guiding portion is released so as to allow the hydraulic cylinder to take on the operating attitude.

A boom attach/detach device includes a boom, an extensible cylinder, and a boom supporting device. At least a part of the boom supporting device is arranged more to a boom front end side than an upper slewing body. When the extensible cylinder conducts extension and contraction operation in a state where coupling between the upper slewing body and the boom by a boom foot pin is cut off, the boom supporting device supports the boom to enable a rear end portion of the boom to move in a boom axis direction. The boom can be attached or detached with ease without a need to use a separate power device from a crane to suppress increases in size, in mass, and in cost of an upper slewing body.

An undercarriage for a vehicle crane includes multiple supports that are pivotably articulated on the chassis between a working arrangement and a transport arrangement, and includes a rotary joint component for the rotatable connection of a superstructure to the undercarriage, with the rotary joint component determining a transport height of the undercarriage, which completely uses a maximum admissible transport height.

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.

The hoist comprises a crosspiece, an insertion portion, and two folding members. The insertion portion may be inserted into a receiver. The folding members are each positioned near opposite ends of the crosspiece and are pivotally coupled to the crosspiece such that each folding member may be pivoted upward and towards each other. The folding members may be lengthened and shortened. When in a folded position, the folding members are retracted and turned inward so that each folding member aligns parallel to the crosspiece. When in the extended working position, a chain is coupled to a top portion of a vertical extension member to the coupling member such that the folding members are in an upright, lifting position. A winch cable extending from the crosspiece and through a pulley positioned near the coupling member is adapted for lifting an object.

A slewing frame of a work machine and a method of assembling a slewing frame of a work machine where the slewing frame is separable into at least two front and rear members, and an operation of connecting these two members can be easily performed. A slewing frame is separable into a front frame and a rear frame. When a pin fitting portion of a rear frame is fitted on a positioning pin of a front frame, and the rear frame is rotated downward, at a position where a front pin hole and a rear pin hole are aligned with each other, a contact portion of the rear connecting portion is brought into contact with a rotation preventing portion. As a result, a connecting pin can be easily inserted into the front pin hole and the rear pin hole.

A cylinder retraction system causes a crawler side frame hoisting hydraulic cylinder, swingably suspended on a ventral surface side of a lower boom, to swing between a retracted attitude, in which the hydraulic cylinder is set along a ventral surface of the lower boom, and an operating attitude, in which the hydraulic cylinder is oriented along a vertical direction. As the rod of the hydraulic cylinder, currently having the operating attitude, is contracted by a predetermined extent, the rod front end of the hydraulic cylinder is guided by the guiding portion until the hydraulic cylinder takes on the retracted attitude. As the hydraulic cylinder, currently having the retracted attitude, is extended by a predetermined extent, engagement between the rod front end of the hydraulic cylinder and the guiding portion is released so as to allow the hydraulic cylinder to take on the operating attitude.

A port crane, such as a mobile port crane, comprising an undercarriage and a superstructure that is attached onto the undercarriage, such as in a rotatable manner. The undercarriage has a modular design such that the undercarriage can be connected to different chassis via modular adapter components in a selective manner so that the selected chassis on the undercarriage is designed as a conventional undercarriage chassis. The undercarriage can alternatively be connected to different chassis via modular adapter components in a selective manner such that the selected chassis on the undercarriage is designed as a port chassis.

An industrial vehicle includes at least a structure 1 with the chassis 3 and a pair of crawler undercarriages 2 each of which is driven by a hydraulic motor 5 which transmits the motion and the engine torque to a planetary gear unit 6 on which is keyed a drive wheel 4. The hydraulic motor 5 and the reduction gear 6 are not directly connected, but between them is interposed a transmission device 10. During the detachment operation of the crawler undercarriage 2 from the chassis 3, the hydraulic motor 5 is released from the device of transmission 10 and remains attached to the chassis 3, preserving its hydraulic connections, while the planetary gear unit 6 and the transmission device 10 remain fixed to the undercarriage 2.