Jib system for a vehicle crane equipped with a bracing device and method for rigging and derigging the bracing device of a vehicle crane

Abstract

To perform processing independently of the orientation of a jib relative to the rest of a vehicle crane with a small amount of structural preparation when automatically rigging and de-rigging a jib system of the vehicle crane.SOLUTION: A bracing device is coupled to a jib (5) by a base frame (6a), and the jib (5) has a lifting cable (9) deflected through a roller head (5c). An articulated, integrated transfer rocker (8) is provided between the jib (5) and the bracing device for automatic rigging and de-rigging. The base frame (6a) swivelingly supporting the transfer rocker (8) on the jib (5) and coupled to the lifting cable (9) displaces the bracing device from a set-down position to a set-up position by changing the length of the lifting cable (9) in the coupled state on a circular path of the roller head (5c) of the jib (5).SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a jib system for a vehicle crane, comprising a telescopic jib and a bracing apparatus, wherein the bracing apparatus can be coupled to the jib by its base frame, and the jib has a roller head and a lifting cable deflected via the roller head. Further, the present invention also relates to a correspondingly equipped vehicle crane and a vehicle crane system comprising such a vehicle crane. The present invention also relates to a method of transferring the bracing apparatus from a transport unit onto the jib of a vehicle crane and a method of transferring the bracing apparatus from the jib of a vehicle crane onto a transport unit.

Background Art

[0002] The factors determining how a vehicle crane or mobile crane can be used are usually set by the respective structural design of the crane. Technical variables such as load-bearing capacity, working radius, lifting height, etc. are essentially determined by the design of the telescopic jib for most cranes. The variables of a vehicle crane can be changed via auxiliary devices so as to increase the load-bearing capacity of the crane and / or reduce the elastic deflection of the crane's jib. An auxiliary device in the form of a bracing device established for this purpose can be, for example, a lateral superlift. By arranging this auxiliary device, the lever arm of the jib can be advantageously shortened. The resulting load increase is in most cases achieved in combination with additional weights and corresponding deflections by the bracing device. These vehicle crane systems equipped with a bracing device should be configured such that the rigging and de-rigging of the bracing device can be easily carried out on-site by structural configurations and corresponding procedures.

[0003] Since the weight of such a vehicle crane is already very considerable, the crane often arrives at the place of use only in a partially disassembled state. This is done in particular to comply with the axle load and the maximum vehicle weight set for driving on public roads. In this context, European Patent No. 1342692 discloses a vehicle crane system comprising a transport unit configured to transport a bracing device in addition to the vehicle crane. The vehicle crane itself comprises a telescopic jib having a basic box and a linearly displaceable inner box. The vehicle crane is designed such that a jib lowered to a temporary storage area for the bracing device is provided laterally. On-site, the bracing device is lifted from the transport unit by the jib and stored temporarily on the storage area of the vehicle crane. Then, the jib is lowered to the rigging position so that the bracing device can be fixed to a fixed area arranged on the basic box of the jib.

[0004] German Patent Application Publication No. 102009020338 and European Patent No. 2248754 disclose vehicle crane systems designed in a similar manner. Specifically, in these cases, the bracing device is also carried to the place of use on a separate transport unit and lifted by the jib of the vehicle crane. However, the bracing device is then partially supported on the ground and partially supported on a small storage area of the vehicle crane. The support on the ground is effected via a support device arranged on the bracing device so that it can be extended from the folded state. The free space created by placing the bracing device away from the ground is used to place the lowered jib under the bracing device by moving the vehicle crane. When the bracing device and the jib are coupled, the vehicle crane system can be used.

[0005] In known designs, in order to enable rigging / delrigging of the bracing device, it is necessary to always store the received bracing device temporarily on the ground or on a storage area formed on a vehicle crane for this purpose. Furthermore, in these designs, in order to be able to receive and store the bracing device that should be at least partially supported on the storage area of the bracing device, it is necessary to always accurately orient the telescopic jib in the direction opposite to the direction of travel and parallel to the longitudinal direction of the vehicle crane. Especially in the case of uneven or unstable ground, it can be difficult to support at least the end side of the bracing device on the ground. Similarly, when forming an additional storage area on the vehicle crane, the installation space required for this purpose must be left empty, and thus there is a drawback that it cannot be used for other purposes or can only be used with difficulty. As a result of typical continuous production, such a vehicle crane, in that case, although not actually used for the configured order received, possible preparations are also made. Therefore, in addition to increasing production costs, the weight and, in relation to this, the operating costs also increase. Overall, in this regard, there is still room for improvement in the previously disclosed embodiments of the prior art.

[0006] Also, another method of attaching the bracing device to the telescopic jib of a vehicle crane has already been described in the German Patent Specification No. 102018115632. The bracing device consists of two bracing arms connected to each other at the ends via a U-shaped holding frame. In this case, the holding frame can be folded from an open receiving position to a fixed position. For the purpose of attachment, the bracing device is received by a semi-trailer and placed at a receiving position on the lower carriage of the vehicle crane. Then, the telescopic jib is introduced into the U-shaped holding frame of the bracing device, and then the U-shaped holding frame is folded to its fixed position and fixed to the telescopic jib.

[0007] Furthermore, the later published German Patent Application Publication No. 102018119316 describes another method of attaching a bracing device to the telescopic boom of a vehicle crane. In this case, the bracing device is based on a semi-trailer and is erected obliquely by the hydraulic cylinder of the semi-trailer. Subsequently, the telescopic boom moves into the bracing device and is pressed onto the telescopic boom by the hydraulic cylinder, and is further pressed onto the telescopic boom in the direction of the mounting position by another hydraulic tilting device of the semi-trailer, and is fixed to the end at this location.

[0008] Furthermore, a method of attaching and detaching an extension lattice mast to and from the telescopic boom of a vehicle crane is already known from German Patent Application Publication No. 102009010452. For the purpose of attachment, the assembled extension lattice mast and the telescopic boom resting on the ground are oriented flush with each other. A lattice mast adapter is arranged at the foot end of the extension lattice mast, and the lattice mast adapter is rotatable about a horizontal axis, is rotated upward by the telescopic boom, and is held in this position via a spacer rod. Subsequently, the lattice mast adapter is fixed to the head of the telescopic boom, and the lifting cable of the telescopic boom is fixed to the head end of the lattice mast adapter. After removing the spacer rod, by retracting the lifting cable, the lattice mast adapter is folded against the head of the telescopic boom, and at the same time the extension lattice mast is lifted and is also folded against the lattice mast adapter. Subsequently, the lattice mast adapter is bolted to the head of the telescopic boom and the extension lattice mast. The separation procedure is performed in the reverse order.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

[0010] Therefore, an object of the present invention is to improve a boom system for a vehicle crane, a vehicle crane equipped therewith, and a vehicle crane system including the vehicle crane, so that when automatically rigging and derigging the vehicle crane, only minor structural preparations are required, and the required procedures can be carried out substantially independently of the orientation of the boom relative to the rest of the vehicle crane. Two methods are also shown that enable the bracing device to be moved between the boom of the vehicle crane and the transport unit in a simple manner in just a few steps. [Means for Solving the Problems

[0011] The device part of this object is achieved by a boom system having the features of claim 1, a vehicle crane having the features of claim 7, and a vehicle crane system having the features of claim 8. The method part of this object is achieved by a method having the features of claim 9 and a method having the features of claim 14. Dependent claims 2-6, 10-13 and 15 each describe other advantageous embodiments of the present invention.

[0012] Accordingly, next, the present invention proposes a boom system for a vehicle crane, the boom system being provided with at least one transfer rocker that can be integrally articulated between the boom of the vehicle crane and the bracing device. The base frame of the bracing device is designed to be able to couple the bracing device to a lifting cable. By rotatably supporting at least one transfer rocker on the boom, the base frame can be displaced along a circular path around the roller head of the boom. As a result, by retracting the lifting cable in the coupled state, the base frame can be reciprocally displaced from the set-down position of the bracing device suspended to some extent below or in the plane of the boom to the setup position of the bracing device lifted onto the boom.

[0013] These vehicle crane systems with a bracing device should be configured such that the rigging and derigging of the bracing device are made possible by the structural configuration and corresponding on-site procedures, preferably with the help of an additional auxiliary crane, a rigging frame, or a special trailer for self-rigging.

[0014] The advantages obtained can be seen in the fact that the jib system requires only very few individual components to enable its self-rigging. A vehicle crane equipped or capable of being equipped with a jib system does not require additional structural configurations to temporarily support or even arrange a bracing device, for example, on the jib system. In this regard, the jib system according to the invention can be considered to be universally applicable as a whole and economically advantageous. In particular, due to modifications and configurations of the structure that are no longer necessary, for example, on the lower carriage and / or the upper structure of the vehicle crane, it becomes possible to construct the vehicle crane as a whole in an economically advantageous manner. Furthermore, initially attaching the bracing device to the jib may allow for a large tolerance range with respect to the orientation of the bracing device relative to the jib. At the same time, the weight of the jib is reduced compared to other typical configurations, which not only reduces the amount of material used but also makes the operation of the jib more economically advantageous as a whole. At the latest after the jib has been roughly erected, the bracing device will be automatically or with only very minor additional measures in an oriented state relative to the jib. As a result, the staff required for rigging and derigging can be minimized.

[0015] Preferably, two transfer lockers, which are not necessarily structurally identical, can be provided in order to obtain better weight distribution and more accurate guidance of the bracing device during rigging and derigging.

[0016] According to one advantageous development of the basic concept of the present invention, at least one fixed point can be provided on or within the area of the roller head. When arranged within the area of the roller head, this can be done, for example, on the inner box of the jib. In an advantageous way, this can be a specific inner box that supports the roller head of the jib. If two transfer rollers are used, two such fixed points can be provided, and in that case, the two fixed points can be arranged, for example, in opposite positions. In this case, "in opposite positions" means arranged on one of the two sides of the plane in which the jib extends. In any case, at least one fixed point is preferably designed to be articulately connectable to the first end region of at least one transfer roller. Thus, depending on the configuration, the transfer roller can also be permanently connected to the relevant fixed point.

[0017] According to the present invention, at least one connection point can be provided on the base frame of the bracing device. Thus, if two transfer rollers are used, two such fixed points can be provided, and in that case, the two fixed points can be arranged, for example, in opposite positions. In this case, "in opposite positions" means arranged on one of the two sides of the plane in which the jib extends. At least one fixed point is preferably designed to be articulately connectable to the second end region of at least one transfer roller. Thus, depending on the configuration, the transfer roller can also be permanently connected to the relevant connection point.

[0018] Furthermore, the present invention proposes that at least one linear drive connected to the roller head via its first end can be provided. As a deviation therefrom, it is equally feasible that the linear drive can be connected to the roller head, for example, only as required. In any case, at least one transfer rocker can be supported at least indirectly at a second end opposite to the first end of the linear drive. Depending on the configuration, the support can be carried out continuously. Regarding the support, it is considered advantageous in this regard if the transfer rocker is connected to the lever in a bend-resistant manner, and the support of the transfer rocker via this lever can be carried out indirectly in this regard.

[0019] Alternatively, at least one transfer rocker extends between a first end region of the transfer rocker and a second end region opposite to the first end region of the transfer rocker, and can comprise a linear drive and a lever. In this case, the lever is articulated to the first end region of the transfer rocker. An attachment portion configured to support on the roller head is arranged at a free end portion of the lever remote from the first end region of the transfer rocker. The linear drive is articulated to the lever via a first end of the linear drive. The connection is arranged within the region of the free end portion of the lever. Furthermore, the linear drive is articulated to a central portion of the transfer rocker via a second end opposite to its first end.

[0020] The aforementioned structure of at least one transfer rocker or at least one of two transfer rockers enables a controlled swiveling of the transfer rocker equipped in this way. This is mainly advantageous when the transfer rocker pivots about its first end region and the free second end region of the transfer rocker reaches top dead center at this point. In this orientation, the transfer rocker can tilt laterally due to gravity in a substantially unbraked and uncontrolled manner. In this case, the attachment part arranged on the lever facilitates the support of the transfer rocker on the jib roller head in such a way that the transfer rocker is prevented from tilting in at least one direction. In that case, a linear drive extending at least indirectly between the attachment part and the transfer rocker then enables, for example due to a change in the length of a hydraulically, pneumatically or electrically driven linear drive, a controlled orientation of the transfer rocker in at least one direction. As described above, it is also feasible to fix the attachment part to the roller head at least temporarily so that the transfer rocker can also be oriented in both directions in a controlled manner.

[0021] According to a particularly preferred embodiment of the present invention, at least one tension element configured to connect the bracing device to the jib at least temporarily can be provided. At least a section of the tension element is rigid, elastic, or essentially movable and can take the form of, for example, a chain with links. By connecting the bracing device and the jib via at least one, preferably four, tension elements, the bracing device can be oriented relative to the jib only by gravity, by being lifted by the bracing device roughing up the corresponding jib for the corresponding period. Preferably, the bracing device can comprise two arms articulated to its base frame, said arms further having connection points that can be connected to the tension elements in any case. It is also feasible for the tension elements to be permanently connected to the connection points. Of course, as an alternative means, the base frame of the bracing device can be configured to have the corresponding connection points. In any case, it is left to those skilled in the art to select a more advantageous configuration, and for that reason, the individual configurations of the bracing device are adopted as a basis.

[0022] The jib system according to the present invention currently presented requires only a few structural preparations to enable automatic rigging and derigging in relation to the bracing device. The movement sequence when setting up and setting down the bracing device can be achieved with existing means that vehicle cranes generally already include as standard. In particular, by at least initially pre-suspending the bracing device on the jib via at least one transfer hook and at least one tension means or at least two, preferably four, tension means, it becomes possible to simply and effectively orient the bracing device relative to the jib, and thus, for example, completely omit complex operations and / or active displacements before the bracing device is displaced to its setup position on the jib. As a result, the required procedures, especially during rigging, are thus minimized.

[0023] The present invention also relates to a vehicle crane having a jib system according to the present invention, as described above. The present invention also relates to a vehicle crane system comprising such a vehicle crane having a jib system and a transport unit formed for transporting a bracing device of the jib system. The advantages obtained are in each case already described in more detail in connection with the jib system of the present invention, and in order to avoid repetition, at this point, the corresponding statements regarding the jib system are referred to.

[0024] Furthermore, the present invention relates to a method useful for transferring a bracing device from a transport unit, in particular a vehicle crane system, to the jib of a vehicle crane. In a particularly preferred method, the vehicle crane system can be a vehicle crane system according to the present invention. This method comprises providing a transport unit on which the bracing device is received within the area of the vehicle crane such that the bracing device is arranged within at least the area below the front part of the jib; coupling in each case at least one transfer roller and at least one tension element to the bracing device and / or the jib; coupling a lifting cable of the vehicle crane deflected on the roller head of the jib to the base frame of the bracing device; starting to displace the bracing device attached to the jib from its set-down position in the direction of the setup position by partially retracting the lifting cable coupled to the base frame, such that the base frame of the bracing device supported on the jib by at least one transfer roller is rotated on a circular path around the roller head with respect to the rocking movement of the entire bracing device attached to the jib via the tension element; Further retract the lifting cable coupled to the base frame until the attachment portion of the transfer lock is supported on the roller head or on a linear drive connected to the roller head, thereby preventing the base frame from further rotating on a circular path; Changing the length of the linear drive that extends at least indirectly between the attachment portion and the transfer lock or the roller head, and then causing any further pivoting movement of the transfer lock that is not otherwise braked to occur as the length of the linear drive changes as the base frame rotates on a circular path and passes beyond the top dead center of the transfer lock; Changing the length of the linear drive further in parallel, whether or not the lifting cable coupled to the base frame is further retracted until the base frame of the bracing device is fully positioned on the jib, especially in its setup position; Fixing the base frame of the bracing device to the fixed area of the jib, especially via at least one releasable connection means; Disconnecting at least the transfer lock from the bracing device before, during, or after fixing the base frame of the bracing device to the fixed area of the jib; including.

[0025] By the measures demonstrated above in the method according to the invention, it becomes possible to transfer the bracing device from the transport unit onto the jib of the vehicle crane, which can be achieved with the involvement of only a few personnel. For this purpose, only a few steps are required to substantially enable the automatic rigging of the vehicle crane. In particular, the orientation of the jib with respect to the lower carriage of the vehicle crane is not thus important, so that it can be very advantageously adapted to the respective local conditions. Thus, the jib can, for example, be oriented at right angles to the longitudinal direction of the lower carriage as a result without adversely affecting the rigging of the vehicle crane.

[0026] According to a preferred development of the method according to the invention, the jib can be roughly lowered, if necessary, in the direction of the bracing device received on the transport unit even before the jib is connected to the bracing device. As a result, the areas of the bracing device and the jib to be connected to each other via the transfer rocker and / or the tension means are approached accordingly in order to enable the work necessary for this purpose to be carried out easily.

[0027] The method according to the invention provides a very advantageous means for automatically orienting the bracing device relative to the jib in that the bracing device is connected to the jib via at least two mutually spaced tension elements, if necessary, before at least one transfer rocker is incorporated between the bracing device and the jib. In other words, the bracing device is in this case connected to the jib exclusively via at least two, preferably four, tension elements. By lifting up the jib, the bracing device is at least partially lifted from the transport unit so that the bracing device is suspended without being at least partially supported under or in the plane of the jib. For this purpose, for example, at least one of the tension elements can be arranged around a part of the jib, and thus the free end portion of the tension element can be connected to the bracing device. For this purpose, the jib can have correspondingly arranged fixing means, and the tension element is held on the fixing means to prevent unwanted displacement. In contrast, the tension element can also be directly connected to the fixing means via one of the end portions of the tension element. Preferably, a total of four tension elements can be used in this way in order to ensure that the jib swings reliably under the jib in a well-timed manner as much as possible before the bracing device is lifted onto the jib.

[0028] Essentially, it is provided that the bracing device can be at least partially lifted from the transport unit by roughing up the jib even before the start of the displacement of the bracing device from the set-down position to the setup position. In this way, the automatic orientation of the bracing device with respect to the jib is advantageously assisted.

[0029] According to another preferred development of the method according to the invention, the jib can be telescopically shortened and / or extended, if necessary, before, during or after the displacement of the linear drive. Such an active change in the length of the jib can serve to ensure that the base frame of the bracing device, which is configured to couple to the fixed area, is displaced at a specified position with respect to the fixed area. In fact, even if the bracing device is pivoted up onto the jib, the fixed area of the jib is not forced to be directly aligned with the base frame of the bracing device, and thus, in this way, the exact orientation of these areas becomes possible.

[0030] The invention also relates to a method useful for moving a bracing device from the jib of a vehicle crane onto a transport unit. Preferably, the vehicle crane can be a vehicle crane according to the invention. The method comprises the step of coupling at each time at least one transfer lock and at least one tension element to the bracing device and / or the jib, the step of releasing the base frame of the bracing device from the fixed area of the jib before, during or after coupling the bracing device to the jib, the step of initiating the displacement of the bracing device arranged on the jib in the direction from its setup position to its set-down position by changing the length of the linear drive that extends at least indirectly between the attachment part and the transfer lock or the roller head until the transfer lock rotates beyond its top dead center, Before, during, or after turning the transfer rocker by changing the length of the linear drive, coupling the lifting cable of the vehicle crane deflected by the jib roller head to the base frame; In particular, by removing the support of the attachment part of the transfer rocker in the roller head, loosening the lifting cable coupled to the base frame, and regarding the swinging movement of the entire bracing device attached to the jib via the tension element, rotating the base frame of the bracing device supported on the jib by at least one transfer rocker on a circular path around the roller head; Before, during, or after the aforementioned measures, providing a transport unit within the area of the vehicle crane such that the transport unit is arranged at least within the area under the bracing device and / or the front part of the jib; Further loosening the lifting cable coupled to the base frame and / or lowering the jib until the bracing device is at least partially arranged on the transport unit; Detaching the bracing device from the jib comprising.

[0031] According to a preferred development of the method according to the invention, the jib can be lowered as required before, during, or after loosening the lifting cable coupled to the base frame until the bracing device is at least partially arranged on the transport unit. Thanks to this interaction, the bracing device can be accurately arranged on the transport unit. Furthermore, according to the invention, it is provided that the jib can be telescopically shortened and / or extended as required before, during, or after releasing the base frame of the bracing device from the fixed area of the jib. In this way, sufficient space can be created to freely displace the base frame on a circular path around the roller head. In other words, the roller head can thereby be retracted until the base frame can be displaced without collision.

[0032] Basically, the treatment of the method according to the invention that has been proven can always be associated with the change in the orientation of the jib with respect to the lower carriage of the vehicle crane. This applies in particular to the placement of the jib with respect to the transport unit in connection with the rigging and / or derigging of the vehicle crane.

[0033] The advantages achieved by the method according to the invention have, by chance, already been disclosed or at least discussed in a similar context in connection with the jib system according to the invention. Therefore, for the sake of avoiding repetition at this point, reference is also made to the previous statement in its entirety regarding that aspect.

[0034] The invention will be explained in more detail below with the aid of the exemplary embodiments shown in the figures.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0036] Figure 1 shows a side view of a vehicle crane system 1 according to the present invention. The vehicle crane system is arranged on the ground U and comprises a multi-axle vehicle crane 2 or mobile crane that can be operated on a road and a transport unit 3. The vehicle crane 2 is equipped with a boom system 4 according to the present invention, and the boom system includes a boom 5 arranged on the vehicle crane 2 and a bracing device 6. In the situation shown here regarding the procedure for attaching the bracing device 6 to the boom 5, the bracing device 6 is still on the storage surface 3a of the transport unit 3, and the bracing device 6 is separately transported from the vehicle crane 1 to the location of use of the vehicle crane 1 by the transport unit 3. In this case, the transport unit 3 is designed in a known manner as a trailer truck comprising a towing vehicle and a semi-trailer. Correspondingly, the storage surface 3a for the bracing device 6 is on the semi-trailer. The vehicle crane 2 usually has a lower carriage 2a, and an upper structure 2b that supports the boom 5 is arranged on the lower carriage 2a. The upper structure 2b can be pivoted relative to the lower carriage 3 about a rotation axis Z1 extending parallel to the upward direction Z. The boom 5 extends together with a longitudinal axis X1 of the boom substantially parallel to the longitudinal direction X, and is articulated to the upper structure 2b so as to be correspondingly raised and lowered (indicated by the curved double arrow) via a horizontal pivot axis Y1. In the example shown here, the lower carriage 2a has a wheeled running gear unit having a total of seven axles each having at least two rubber-tired wheels, and the rubber-tired wheels are rotatably mounted on the axles and are spaced apart from each other parallel to the vertical direction Y. In this case, the slightly nested boom 5 has a basic box 5a arranged on the upper structure 2b, and in the basic box 5a, an inner box 5b is arranged so as to be hydraulically displaceable longitudinally preferably relative to the longitudinal axis X1 of the boom 5. Inside the inner box, the innermost inner box 5b supports a roller head 5c at its upper end and is slightly extended.

[0037] The superstructure 2b of the vehicle crane 2 is swiveled approximately 180° rearward from the position facing forward for the operation of driving the vehicle crane 2 on the road. Thus, it can also be seen in FIG. 1 that the jib 5 projects rearward well beyond the lower carriage 2a. In a corresponding manner, it is shown in FIG. 1 that a rear support of the vehicle crane 2, not detailed by reference numerals, is extended for the purpose of leveling and stabilizing the vehicle crane 2.

[0038] FIG. 2 shows the vehicle crane system 1 of FIG. 1 in a position where the bracing device 6 is being moved from the transport unit 3 by the main jib 5. For the next procedure of attaching the bracing device 6 to the main jib 5, the main jib 5 is slightly roughed up about the pivot axis Y1, and subsequently, the transport unit 3 is driven rearward toward the rear end of the vehicle crane 2. The driving movement of the transport unit 3 is indicated by the white arrow. After the transport unit 3 is driven toward the vehicle crane 2, the main jib 5 is roughed up to such an extent that the roller head 5c of the jib 5 is placed on the bracing device 6. Since the jib 5 faces upward, the basic box 5a of the jib 5 is partially and gradually introduced into the bracing device 6 from above as seen in the longitudinal direction X1 of the jib and the direction of the superstructure 2b. In a corresponding manner, the transport unit 3 is placed in this transfer position relative to the vehicle crane 2 such that most of the bracing device 6 is disposed under the front part of the jib 5.

[0039] Figure 3 shows a top view of the vehicle crane system 1 of Figure 2. It can be seen that the bracing device 6 is not oriented in an optimal way with respect to the boom 5. In contrast to Figure 2, the boom 5 is no longer disposed between the arms 6b, 6c of the bracing device 6, but instead is already disposed slightly above the left arm 6b of the bracing device 6. Thus, the boom 5 is even more raked than shown in Figure 2 in order to avoid collision with the arm 6b. An optimal orientation would exist if the longitudinal axis X1 of the boom 5 were aligned with the central longitudinal axis of the bracing device 6, which is not shown in detail. However, in this case, there is an angular offset between the longitudinal axis X1 and the longitudinal axis of the bracing device 6. In addition to this angular offset, a lateral offset and / or a vertical offset may exist, or may additionally exist. These different types of offsets that can occur are due to the orientation of the transport unit 3 when the transport unit 3 moves backward towards the vehicle crane 2, the orientation of the bracing device 6 on the storage surface 3a of the transport unit 3, and the orientation of the storage surface 3a of the transport unit with respect to the vehicle crane 2 due to the non-horizontal movement of the ground U. In the transfer position shown in Figure 3, the bracing device 6 is oriented slightly obliquely with respect to the longitudinal axis X1 of the boom 5, but the vehicle crane 2 and the transport unit 3 are disposed on a flat ground U.

[0040] Furthermore, Figure 3 shows the basic structure of the bracing device 6 having a base frame 6a and two arms 6b, 6c articulated to the base frame 6a. In this top view, it can be seen that the bracing device 6 is thus configured in a substantially U-shape, and the arms 6b, 6c are adjacent to both side ends of the base frame 6a. The base frame 6a connecting the two arms 6b, 6c is disposed in the transfer position with a sufficient spatial interval in front of the roller head 5c as seen in the direction of the longitudinal axis X1 of the boom 5. Thus, after the bracing device 6 is oriented with respect to the boom 5, the boom 5 can be introduced into the bracing device 6 between the two arms 6b, 6c and through the base frame 6a.

[0041] Regarding the orientation of the bracing device 6 with respect to the jib 5, it can be seen from FIG. 3 that the bracing device 6 is directed obliquely with respect to the jib 5 such that the free end of the arm 6b is disposed below the basic box 5a of the trailer 5. In a corresponding manner, the jib 5 must be roughly lifted in the previous step until the basic box 5a of the jib 5 is disposed completely above the bracing device 6 which is at this point still resting on the storage surface 3a of the transport unit 3. Only when the bracing device 6 is more effectively oriented with respect to the jib 5 can the jib 5 be lifted to a lesser extent, because in that case the jib 5 can be partially moved between the arms 6b, 6c when the transport unit 3 is driven backwards towards the vehicle crane 2.

[0042] In order to orient the bracing device 6 with respect to the jib 5, the bracing device 6 is connected to the jib 5 via a total of four tension elements 7a to 7d, which are in this case only indicated by black dots. The tension elements 7a to 7d are designed as a chain, cable or belt in a typical manner. As can be seen in this top view, the four tension elements 7a to 7d are arranged at the corners of a conceptual rectangle, the longitudinal extension of which runs in the direction of the longitudinal axis X1. In this case, the tension elements 7a, 7d facing the vehicle crane 2 connect the basic box 5a to the free ends of the arms 6b, 6c each time, and the tension elements 7b, 7c remote from the vehicle crane 2 connect the roller head 5c to the ends of the arms 6b, 6c facing the base frame 6a within the region of the upper roller head axis. After being joined via the tension elements 7a to 7d, the jib 5 is rough-lifted, whereby the bracing device 6 is lifted from the storage surface 3a of the transport unit 3 and is thus automatically oriented with respect to the jib 5 in a freely suspended manner by utilising gravity. Subsequently, the bracing device 6 thus oriented is then set down onto the storage surface 3a of the transport unit 3 by rough-lowering the jib 5. In this regard, it can be seen in FIG. 2 that the bracing device 6 in the set-down state is substantially resting on the storage surface 3a of the transport unit 3 via four points. In this regard, the support 6d is arranged in each case within the region of the centre of each of the arms 6b, 6c and can be formed in a V-shape or as a vertical strut. The fixed winch 6e of the bracing device 6, which is arranged within the region of the ends of the arms 6b, 6c facing the base frame 6a and projects downwards, is used as a further support. In the case of other designs of the bracing device 6, a corresponding support can also be provided instead of the fixed winch 6e or on the fixed winch 6e. In connection with setting down the bracing device 6 onto the support surface 3a of the transport unit 3 after the automatic orientation has taken place, it may be necessary for the length of the support 6d or the corresponding support on the fixed winch 6e to be adapted in order to at least maintain the achieved horizontal orientation of the bracing device 6 with respect to the jib 5. This is necessary in particular when the load surface 3a is not oriented horizontally when the vehicle crane 3 is supported horizontally.

[0043] It is obvious that this orienting step can be omitted if the bracing device 6 is already oriented with respect to the jib 5 on the storage surface 3a of the transport unit 3 by simply driving the transport unit 3 towards the vehicle crane 2.

[0044] Figure 4 shows a top view according to Figure 3, but shows the situation after automatically orienting the bracing device 6 with respect to the jib 5 and setting down the oriented bracing device 6 on the storage surface 3a of the transport unit 3. Subsequently, the tension elements 7b, 7c arranged within the region of the base frame 6a of the bracing device 6 are removed. The remaining two tension elements 7a, 7d within the region of the arms 6b, 6c remain on the jib 5 and are lengthened or replaced by other, preferably even longer, tension elements 7a, 7d, which are adapted to a further step of the mounting procedure with respect to the length of the tension elements 7a, 7d. If necessary, the jib 5 is further rough - downed in the direction of the bracing device 6 so that the jib 5 assumes a position convenient for the next treatment with respect to the bracing device 6.

[0045] Figure 5 shows a detailed side view of the vehicle crane 2 according to FIG. 1 from the jib 5 and the bracing device 6 to be attached, with the bracing device 6 in a first position relative to the jib 5, the first position being defined as the set-down position A1. In this set-down position A1, the bracing device 6 is already suspended from the jib 5 and has already been slightly lifted in advance by the jib 5 from the storage surface 3a of the transport unit 3, and the transport unit 3 has run away from under the jib 5. The bracing device 6 is suspended from the jib 5 via the illustrated front tension element 7a, a hidden rear tension element 7d parallel to this tension element 7a, a front rod-shaped transfer rocker 8, and a hidden rear transfer rocker parallel to this transfer rocker 8. Furthermore, the lifting cable 9 is guided along the jib 5 to the front central end of the base frame 6a via the upper deflection roller 13 of the roller head 5c as seen along the longitudinal axis X1 of the jib 5, and is fixed to the base frame 6a at a fourth fixed point S4 at this location. The lifting cable 9 is merely symbolically illustrated by a dashed-dotted line. Thus, the bracing device 6 is suspended from the jib 5 at a total of five points.

[0046] To achieve this state, in addition to the lifting cable 9, before lifting the bracing device 6 from the transport unit 3, the tension elements 7a, 7d are each such that the lower ends of the tension elements 7a, 7d are articulated to the lower end of the support 6d at a third fixed point S3, and the upper ends of the tension elements 7a, 7d are articulated to the basic box 5a of the jib 5 at a fifth fixed point S5 laterally at the top. At this location, when the bracing device 6 is automatically oriented with respect to the jib 5, the tension elements 7a, 7d are already fixed. Also, the transfer rocker 8 is such that the lower first end region 8a of the transfer rocker 8 is fixed each time at a first fixed point S1 within the lower region of the roller head 5c, and the upper second end region 8b on the opposite side of the transfer rocker 8 is fixed to the base frame 6a at a second fixed point S2 laterally at the front. From the arrangement of the fifth fixed point S5 with respect to the third fixed point S3 and the arrangement of the second fixed point S2 with respect to the first fixed point S1, the bracing device 6 is not freely suspended from the jib 5. Instead, it has already been swiveled to the left on a circular path via the lifting cable 9, and thus it is clear that it is arranged outside the possible dead points with respect to the swivel drive or attachment drive via the lifting cable 9. In a corresponding manner, the tension elements 7a, 7d and the deflection rocker 8 are swiveled to the left about the fifth fixed point S5 or the second fixed point S2 with respect to the vertical line.

[0047] Fixing the tension elements 7a, 7d and the two transfer rockers 8 to the jib 5 or the bracing device 6 is each configured such that they can swivel about an axis that is at least horizontal and oriented laterally with respect to the longitudinal axis X1 of the trailer 5. As can be seen in the top view according to FIG. 4, the tension elements 7a, 7d and the two transfer rockers 8 extend into the lateral intermediate space between the jib 5 or the basic box 5a of the jib 5 or the roller head 5c and the inner sides of the arms 6b, 6c. Furthermore, the transfer rocker 8 is provided to be oriented outside the dead point of the transfer rocker and forward in the direction of the longitudinal axis X1 with respect to the drive lifting cable 9. The same applies to the tension elements 7a, 7d in order to achieve the defined kinematics of the bracing device 6 with respect to the jib 5 in this way.

[0048] The tensioned lifting cable 9, the tension elements 7a, 7d to which a tensile load is applied thereby, and the two transfer lockers 8 to which a compressive load is applied ensure that the bracing device 6 remains firmly in the set-down position A1 shown in FIG. 5 even if the bracing device 6 is lifted from the storage surface 3a of the transport unit 3 by raising and lowering the jib 5.

[0049] FIG. 6 shows the start of the displacement of the bracing device 6 in the direction from the set-down position A\(_1\) of the bracing device 6 to the setup position A\(_2\) above the jib 5. For this purpose, by winding up the lifting cable 9, a corresponding tensile force is applied to the bracing device 6, and thus the base frame 6a, which is coupled to the lifting cable 9 and supported by the two transfer lockers 8 on the jib 5, is rotated without colliding upward at a spatial interval on a circular path around the roller head 5c (indicated by the white arrow curved in the clockwise direction). The radius of the circular path is defined by the length of the transfer locker 8 extending between the fixed point S\(_1\) and the fixed point S\(_2\). In this case, the bracing device 6, which is simultaneously attached to the jib 5 via the tension elements 7a, 7d, is displaced with respect to the swinging movement of the vehicle crane 2 in the direction of the jib 5, and the swinging movement consists of a movement sequence of translation simultaneous with the rotation, in which movement sequence the bracing device 6 is supported on the swivel tension elements 7a, 7d (indicated by the white arrow curved in the counterclockwise direction). Since the height of the fourth fixed point S\(_4\) of the lifting cable 9 in the base frame 6a is higher than the height of the deflection roller 13 in the roller head 5c, the guidance via the deflection roller 13 is abandoned or is no longer required.

[0050] After passing beyond the vertical orientation of the transfer rocker 8 with respect to the top dead center and further pulling and moving the lifting cable 9, in order to avoid the situation where the bracing device 6 would have its base frame 6a lying horizontally on the upper side of the basic box 5a in an uncontrolled manner, it is advantageous for the tensile force of the lifting cable 9 to receive a reaction force acting on the transfer rocker 8 that is smaller than the tensile force of the lifting cable 9. This reaction force can be provided in the form of a spring or a hydraulic cylinder. The hydraulic cylinder has the advantage that it can also be used to reach and pass beyond the aforementioned top dead center in the opposite direction during the process of removing the bracing device 6 from the jib 5.

[0051] In a variation of the embodiment shown here purely as an example, the transfer rocker 8 is additionally connected to the lever 10 in a bending-resistant manner within the region of the first fixed point S1 and is thus configured as an angle lever. An attachment part 11 is arranged at the free end of the lever 10. Furthermore, a linear drive 12 is laterally connected to the roller head 5c via its first end 12a and is oriented vertically when the jib 5 extends horizontally. Before or when reaching the top dead center (in this case approximately a vertical line) of the second end region 8b of the transfer rocker 8, the attachment part 11 of the lever 10 is supported on the second end 12b of the linear drive 12 opposite to the first end 12a. At this time, the ability of the base frame 6a to further rotate on a circular path around the roller head 5c is initially blocked and depends on the change in the length of the linear drive 12.

[0052] Figure 7 shows a further detailed view according to FIG. 5, in which the bracing device 6 is in a third position relative to the jib 5. In this third position, the base frame 6a of the bracing device 6 is arranged on the basic box 5a of the jib 5, and the bracing device 6 has reached the setup position A2 of the bracing device on the jib 5. For this purpose, the further rotation of the base frame 6a on a circular path around the roller head 5c was carried out by the linear drive 12 being retracted against the cable force of the lifting cable 9. The second end region 8b of the transfer rocker 8, which is loaded by the weight of the bracing device 6, is thereby slowly lowered towards the jib 5, and the first end region 8a of the transfer rocker 8 is continuously damped or braked in a controlled manner with respect to the free rotation about the fixed point S1 of the roller head 5c via the lever 10 supported on the linear drive 12. Depending on the configuration or procedure, during this movement, a further retraction of the lifting cable 9 can be carried out or omitted. In the absence of the lifting cable 9, the attachment part 11 must be pre-bolted to the second end 12b of the linear drive 12.

[0053] Finally, the bracing device 6, in particular its base frame 6a, should then still be fixed to the basic box 5a. This is usually done by bolting the first connecting plate 14a to the basic box 5a and the second connecting plate 14b to the base frame 6a. Only by reaching the setup position A2, the base frame 6a is oriented by the connecting plate 14a of the base frame, but only the front one of these connecting plates is shown in FIG. 7, because the rear one parallel to this connecting plate is thereby hidden in the height direction with respect to the second connecting plate 14b on the base frame 6a as required. The spatial interval between the first connecting plate 14a and the second connecting plate 14b forms a fixing area when the bracing device 6 is arranged in the setup position A2 and can be adjusted over the length of the transfer rocker 8. In the present exemplary embodiment, the length of the transfer rocker 8 is selected to be slightly longer such that the first connecting plate 14a is oriented as seen along the longitudinal axis X1 with respect to the second connecting plate 14b in a manner slightly offset with respect to the upper structure 2b. Basically, the length of the transfer rocker 8 can also be selected such that the two connecting plates 14a, 14b are already aligned with each other when they reach the setup position A2. In this case, the base frame 6a of the bracing device 6 connected to the roller head 5c via the transfer rocker 8 is displaced together with the first connecting plate 14a to an aligned position with respect to the second connecting plate 14b of the jib 5 by the innermost inner box 5b having the roller head 5c being telescopically extended accordingly. As a result, when the first connecting plate 14a and the second connecting plate 14b of the fixing area are aligned with each other, the base frame 6a is fixed to the jib 5 via fastening means not shown in detail here. Subsequently, the rigging cylinders 15, which are arranged in each case close to the base frame 6a on the arms 6b, 6c, are swiveled from the parking position to the operating position and fixed to the lower side of the basic box 5a at the corresponding support points. By actuating the rigging cylinders 15, the arms 6b, 6c can be swiveled slightly upwards, and thus the tension elements 7a, 7d can be released and removed.Next, the transfer lock 8 is disengaged from the bracing device 6 or its base frame 6a in order to enable the telescoping function of the jib 5. The transfer lock 8 remains on the roller head 5c in the parking position. Thus, the lifting cable is released from the fourth fixed point S4 and passed through the roller head 5c for the normal crane operation of the vehicle crane 2.

[0054] In an alternative embodiment of the transfer lock 8, instead of forming the lever 10 in a way that is strong against bending, the lever is prepared to be formed like the transfer lock 8 in such a way that it is pivotable about the first fixed point S1. Further, the linear drive 12 is then articulated at the free end portion 10a of the lever 10 via the first end portion 12a of the linear drive 12. The second end portion 12b of the linear drive 12 is articulated to the central portion 8c of the transfer lock 8. In the case of this alternative, the lever 10 also pivots to the stopper on the roller head 5c together with the attachment portion 11 of the lever 10 while pulling in the lifting cable 9 coupled to the base frame 6a. From this point on, further pivot movements of the transfer lock 8 without other braking are similarly affected by the change in the length of the linear drive 12 when the transfer lock 8 passes beyond its top dead center, as in the previously demonstrated deformed configurations.

[0055] The transfer of the bracing device 6 onto the transport unit 3, which extends to some extent in the opposite direction from the boom 5 of the vehicle crane 2, is carried out in the reverse order appropriate to the individual procedures, as has already been explained in more detail in this specification. In both deformation forms, the displacement of the bracing device 6 arranged on the boom 5 from its setup position A2 to the set-down position A1 in the direction of the boom 5 begins by reducing the length of the linear drive 12 that is indirectly supported on the roller head 5c of the boom 5 via the attachment part 11. In contrast, in the deformation form of the previously demonstrated embodiment, the said transfer is carried out by increasing or reducing the length of the linear drive 12 connected to the roller head 5c. In either case, the transfer rocker 8 is swiveled until its second end region 8b reaches the top dead center. The movement sequence beyond this is based on the slackening of the lifting cable 9 coupled to the base frame 6a of the bracing device 6.

Explanation of Signs

[0056] 1 Vehicle crane system 2 Vehicle crane 2a Lower carriage 2b Upper structure 3 Transport unit 3a Storage surface 4 Boom system 5 Boom 5a Basic box 5b Inner box 5c Roller head 6 Bracing device 6a Base frame 6b Arm 6c Arm 6d Support 6e Fixed winch 7a Tension element 7b Tension element 7c Tension element 7d Tension element 8 Transfer rocker 8a First end region 8b Second end region 9 Lifting cable 10 Lever 11 Attachment portion 12 Linear drive 12a First end 12b Second end 13 Deflection roller 14a First connecting plate 14b Second connecting plate 15 Rigging cylinder A1 Set-down position A2 Setup position S1 First fixed point S2 Second fixed point S3 Third fixed point S4 Fourth fixed point S5 Fifth fixed point U Ground X Vertical direction X1 Vertical axis Y Horizontal direction Y1 Pivot axis Z Upward direction Z1 Rotation axis

Claims

1. A boom system (4) of a vehicle crane (2), comprising a telescopic boom (5) and a bracing device (6), wherein the bracing device (6) can be coupled to the telescopic boom (5) by a base frame (6a) of the bracing device (6), and the telescopic boom (5) has a roller head (5c) and a lifting cable (9) deflected via the roller head (5c), wherein at least one transfer rocker (8) that can be integrally joined in an articulated manner is provided between the telescopic boom (5) and the bracing device (6), and by rotatably supporting the transfer rocker on the telescopic boom (5), the base frame (6a) configured to be coupled to the lifting cable (9) can reciprocally displace from a set-down position (A1) of the bracing device (6) to a setup position (A2) of the bracing device (6) by changing the length of the lifting cable (9) on a circular path around the roller head (5c) in a coupled state. boom system (4).

2. At least one, particularly two, first fixing points (S1) on the opposite sides are provided on or in the region of the roller head (5c), and the first fixing points (S1) can be or are coupled to a first end region (8a) of the at least one transfer rocker (8). The boom system (4) according to Claim 1.

3. At least one, particularly two, second fixing points (S2) are provided on the base frame (6a) of the bracing device (6), and the second fixing points (S2) can be or are coupled to a second end region (8b) of the transfer rocker (8). The boom system (4) according to Claim 2.

4. At least one linear drive (12) is provided, and the linear drive (12) is connected or can be connected to the roller head (5c) via a first end (12a) of the linear drive (12). The at least one transfer lock (8) is supported on a second end (12b) of the linear drive (12) opposite to the first end (12a) of the linear drive (12), at least indirectly, in particular in a bend-resistant manner, via a lever (10) connected to the transfer lock (8). The lever (10) is characterized by having an attachment part (11) supported on the second end (12b) of the linear drive (12). The jib system (4) according to claim 3.

5. At least one tension element (7a - 7d) is provided for at least temporarily connecting the bracing device (6) to the telescopic jib (5), the bracing device (6) comprises two arms (6b, 6c), the two arms (6b, 6c) are articulated to the base frame (6a), and each has a connection point (S3) that can be or is connected to the tension element (7a - 7d). The jib system (4) according to any one of claims 1 to 4.

6. Comprising the jib system (4) according to any one of claims 1 to 5 Vehicle crane.

7. A vehicle crane having the jib system (4) according to claim 5 and a transport unit (3) configured to transport the bracing device (6) of the jib system (4). Vehicle crane system (1).

8. A method of moving a bracing device (6) from a transport unit (3), in particular the vehicle crane system (1) according to claim 7, onto the telescopic jib (5) of the vehicle crane according to claim 6, comprising: Providing the transport unit (3) on which the bracing device (6) is received within the area of the vehicle crane such that the bracing device (6) is arranged at least within the area below the front part of the telescopic jib (5); Coupling at least one transfer lock (8) and at least one tension element (7a, 7d) to the bracing device (6) and the telescopic jib (5) each time; Coupling a lifting cable (9) of the vehicle crane deflected on a roller head (5c) of the telescopic jib (5) to a base frame (6a) of the bracing device (6). By partially retracting the lifting cable (9) coupled to the base frame (6a), starting to displace the bracing device (6) attached to the telescopic jib (5) from its set-down position (A1) in the direction of the setup position (A2), and regarding the rocking movement of the entire bracing device (6) attached to the telescopic jib (5) via the tension elements (7a, 7b), a step of causing the base frame (6a) supported on the telescopic jib (5) by the at least one transfer rocker (8) to rotate on a circular path around the roller head (5c); Until the attachment portion (11) of the transfer rocker (8) is supported on a linear drive (12) connected to the roller head (5c), further retract the lifting cable (9) coupled to the base frame (6a), thereby preventing the base frame (6a) from further rotating on the circular path; A step of changing the length of the linear drive (12) that extends at least indirectly between the attachment portion (11) and the roller head (5c), and then causing another non-braked pivoting movement of the transfer rocker (8) to occur when passing beyond the top dead center of the transfer rocker (8) in response to the change in the length of the linear drive (12) during the rotation of the base frame (6a) on the circular path. The linear drive (12) is or can be connected to the roller head (5c) via a first end portion (12a) of the linear drive (12). The at least one transfer rocker (8) is supported on a second end portion (12b) opposite to the first end portion (12a) of the linear drive (12) at least indirectly, in particular in a bend-resistant manner, via a lever (10) connected to the transfer rocker (8). The attachment portion (11) supported on the second end portion (12b) of the linear drive (12) is part of the lever (10). the step of further varying the length of the linear drive (12) in parallel, regardless of whether the lifting cable (9) coupled to the base frame (6a) of the bracing device (6) is further retracted until the base frame (6a) is fully disposed on the telescopic jib (5), particularly at the setup position (A2); the step of fixing the base frame (6a) of the bracing device (6) to the fixed region (5d) of the telescopic jib (5), particularly via at least one releasable connecting means; the step of disconnecting at least the transfer roller (8) from the bracing device (6) before, during, or after fixing the base frame (6a) of the bracing device (6) to the fixed region (5d) of the telescopic jib (5); comprising a method.

9. The method according to claim 8, characterized in that, before coupling the telescopic jib (5) to the bracing device (6), the telescopic jib (5) is roughly lowered in the direction of the bracing device (6) received, if necessary, on the transport unit (3). The method according to claim 8.

10. Before integrating the at least one transfer roller (8) between the bracing device (6) and the telescopic jib (5), the bracing device (6) is coupled to the telescopic jib (5) via at least two mutually spaced tension elements (7a - 7d), if necessary, and by roughly lifting the telescopic jib (5), the bracing device (6) is at least partially lifted from the transport unit (3), whereby the bracing device (6) is particularly automatically oriented with respect to the telescopic jib (5). The method according to claim 8 is characterized by this. The method according to claim 8.

11. The method according to claim 8, characterized in that the bracing device (6) is at least partially lifted from the transport unit (3) by roughly lifting the telescopic jib (5) before starting the displacement of the bracing device (6) from the set - down position (A1) to the setup position (A2). The method according to claim 8.

12. Before, during, or after the displacement of the linear drive (12), the telescopic jib (5) is, if necessary, telescopically shortened and / or extended until the base frame (6a) of the bracing device (6), which is configured to couple to the fixed region of the telescopic jib (5), is arranged at a specified position relative to the fixed region. The method according to claim 8.

13. A method of transferring a bracing device (6) from a telescopic jib (5) of a vehicle crane according to claim 6 to a transport unit (3), in particular onto a vehicle crane system (1) according to claim 7, comprising: coupling at each time at least one transfer roller (8) and at least one tension element (7a - 7d) to the bracing device (6) and / or the telescopic jib (5); releasing the base frame (6a) of the bracing device (6) from the fixed region (5d) of the telescopic jib (5) before, during, or after coupling the bracing device (6) to the telescopic jib (5); initiating displacement of the bracing device (6) arranged on the telescopic jib (5) from its setup position (A2) in the direction of the set - down position (A1) by changing the length of a linear drive (12) that extends at least indirectly between an attachment portion (11) and the roller head (5c) until the transfer roller (8) is pivoted beyond its top - dead - center position, wherein the linear drive (12) is or can be connected to the roller head (5c) via a first end (12a) of the linear drive (12), the at least one transfer roller (8) is supported on a second end (12b) of the linear drive (12) opposite the first end (12a) via a lever (10) connected to the transfer roller (8) at least indirectly, in particular in a bend - resistant manner, and the attachment portion (11) supported on the second end (12b) of the linear drive (12) is part of the lever (10). Before, during, or after turning the transfer roller (8) by changing the length of the linear drive (12), coupling the lifting cable (9) of the vehicle crane deflected by the roller head (5c) of the telescopic jib (5) to the base frame (6a); In particular, by removing the support of the attachment portion (11) on the roller head (5c), loosening the lifting cable (9) coupled to the base frame (6a), and regarding the swinging movement of the entire bracing device (6) attached to the telescopic jib (5) via the tension elements (7a - 7d), enabling the base frame (6a) supported on the telescopic jib (5) by the at least one transfer roller (8) to be rotated on a circular path around the roller head (5c); Before, during, or after the above-described procedure, providing the transport unit (3) within the area of the vehicle crane such that the transport unit (3) is arranged at least within the area under the front part of the bracing device (6) and / or the telescopic jib (5); Loosening the lifting cable (9) coupled to the base frame (6a) and / or lowering the telescopic jib (5) further until the bracing device (6) is at least partially arranged on the transport unit (3); Detaching the bracing device (6) from the telescopic jib (5); comprising a method.

14. The method according to claim 13, characterized in that the telescopic jib (5) is lowered as required before, during, or after loosening the lifting cable (9) coupled to the base frame (6a) until the bracing device (6) is at least partially arranged on the transport unit (3). The method according to claim 13.

Images