EP3793929B1 - Vehicle crane comprising a movable adapter between the main boom and the main boom extension - Google Patents

Description

The invention relates to a mobile crane, in particular a mobile crane or crawler crane, with a main boom, a main boom extension and an adapter arranged between the main boom and the main boom extension with a first connection level and a second connection level, the adapter being designed to be movable in such a way that the first connection level relative to the second connection level is movable.

The European disclosure document EP 0 728 695 A1 discloses a mobile crane according to the preamble of claim 1 with a telescoping main boom and a telescoping main boom extension, which are connected to each other via an adapter. The adapter is designed as a double rocker in order to move the main boom extension from a rest position, in which a longitudinal direction of the main boom runs parallel and next to a longitudinal direction of the main boom extension, into an operating position in which the longitudinal direction of the main boom extends in the longitudinal direction of the main boom extension. For this purpose, the adapter has a main boom extension connection element and a main boom connection element, which run parallel to one another in the operating position and also in the rest position.

From the German utility model DE 201 07 984 U1 Another mobile crane with a telescoping main boom and a main boom extension is known. The main boom extension is attached to a head of the main boom via an adapter. The rigid adapter is arranged at its lower end and thus a first connection level fixed to the head of the main boom and at its upper end the main boom extension and thus a second connection level is mounted rocking about a horizontal luffing axis. In the area of the lower end of the main boom extension and in the area of the adapter, a total of four luffing supports are arranged, which protrude in pairs in the longitudinal direction of the main boom extension backwards in a V-shape and at the ends of which ropes or guy rods are arranged. With regard to such mobile cranes with a luffing main boom extension, it is generally known that Rocking axis to be arranged either in front on the edge of the adapter or centrally on the adapter.

The German Offenlegungsschrift DE 10 2016 009 038 A1 discloses a comparable mobile crane with a telescoping main boom and a main boom extension. There, however, the adapter is not designed to be rigid. The adapter is only rigidly attached to the boom head on the one hand, but on the other hand a fastening frame that can be pivoted about a luffing axis is provided for fastening the main boom extension. For a luffing movement of the main boom extension, this fastening frame can be pivoted at the end opposite its luffing axis via an adjusting cylinder, whereby a luffing of the main boom extension can be achieved. The adjustment cylinder is supported on the outside of the adapter as a mounting frame.

Another adapter for a mobile crane with a telescopic boom for luffing a main boom extension is also from the Chinese patent application CN 101 898 728 A known. The adapter used there has, instead of the adjustment cylinder, a connecting rod that can be gradually changed in length using bolts.

It is also generally known to bolt a rigid main boom extension directly or via a rigid adapter to a main boom in a fixed angular position between the main boom and the main boom extension. In one variant, the main boom extension can also be attached to the main boom or the adapter in other fixed angular positions. For this purpose, the main boom extension can be swiveled in relation to the main boom or the adapter via two bolt connections. This pivoting movement and the subsequent definition in the other angular position can be connected to tabs via hydraulic cylinders or other auxiliary drives. In this variant, the load transfer, especially that of the transverse force, occurs only via the two bolt connections, which absorb the forces acting transversely to a system axis. The torsional moments are also only distributed between two bolt connections because the hydraulic cylinders or shackles are connected in an articulated manner.

The object of the invention is to provide a mobile crane with an adapter between the main boom and the main boom extension, the load-bearing capacity of which is improved and the set-up is simplified.

This object is achieved by a mobile crane with the features of claim 1. In the dependent claims 2 to 13 advantageous embodiments of the invention are specified.

There is an improvement in the carrying capacity and a simplification of setting up a mobile crane, in particular a mobile crane or crawler crane, with a main boom, a main boom extension and an adapter arranged between the main boom and the main boom extension with a first connection level and a second connection level, the adapter being designed as a double rocker is achieved in that the first connection level is laterally displaceable and angled relative to the second connection level. This advantageously enables controlled mobility in the area of the adapter. As a result, the introduction of force from the main boom extension into the main boom can be optimized, which is associated with an increase in load capacity. In addition, a seesaw movement of the main boom extension relative to the main boom can be implemented passively during setup or actively during operation of the mobile crane under load. The optimization achieved makes it possible to avoid using additional and/or higher-quality material for the adapter in order to passively reduce the deformation of the adapter. Additional and/or higher-quality material or significantly stronger hydraulic cylinders always mean an increase in costs, which is also avoided here. Since the location of the pivot point or the location of the luffing axis for the luffing main boom extension can be moved relative to the main boom, simplified set-up can be carried out in a position of the pivot point "front" and after a movement or adjustment of the adapter in a position of the pivot point " in the middle" the statics and thus the load-bearing capacity are improved.

The location of the pivot point "front" means that the pivot point or the rocking axis in the second connection level to the edge of the adapter, the dem Ground is facing or a counterweight of the mobile crane is facing away, that is offset in the direction of the main boom extension from the center. When the adapter is in the "front" position, the main boom extension can be set up easily. For a better static position, main booms with a pivot point in the middle of the main boom head, i.e. at a distance from the lateral outer edge, are also known. The pivot points or the components of the pivot points are exposed to different loads depending on the angle of attack of the additional device. With the new option of adjusting the pivot point, an optimal load transfer from the luffing main boom extension to the main boom can be achieved via the "middle" pivot point position. As a result, the main boom can then be designed correspondingly lighter or achieve higher load capacities. Due to the limitation of axle loads for mobile cranes to 12 t for road operation, the weight and thus the weight of the main boom is an important criterion, especially for mobile cranes.

In principle, it is now possible with the movable adapter according to the invention to luff a luffing main boom extension using a conventional guying such as the luffing cable and to use the movable adapter instead of the otherwise conventional luffing axis.

In an advantageous embodiment, it is provided that the adapter is fastened with its first connection level directly to a main boom head of the main boom and is fixed indirectly with its second connection level to a foot piece of the main boom extension. In this configuration, additional intermediate pieces, preferably as lattice mast elements, can be provided between the first connection level and the main boom head and/or the second connection level and the base piece of the main boom extension, which can also serve as an adapter and/or extension, for example. Thus, an existing adapter in a different size can also be used in the sense of the invention between the main boom and the main boom extension.

In a preferred embodiment, it is provided that the first connection level of the adapter is directly attached to a main boom head of the main boom is fastened and/or, preferably and, is fastened with its second connection level directly to a foot piece of the main boom extension. This advantageously optimizes power transmission and mobility in the area of the adapter, which is arranged near the head of the main boom and/or the base piece.

In an advantageous embodiment of the invention, the adapter is designed as a double rocker. The design as a double rocker allows in particular a defined mobility of the adapter and the adapter combines mobility with high static stability.

It is advantageously provided that the adapter, seen transversely and laterally to a longitudinal direction of the main boom, consists of a frame element, a rocker element, a coupling element and a crank element, which are connected circumferentially via first, second, third and fourth joint axes running parallel to one another and between A length-adjustable diagonal element is arranged on two diagonally opposite joint axes, with which the adapter is fixed.

It is advantageous if the first and fourth joint axis lie in the first connection level and the second and third joint axis lie in the second connection level.

The diagonal element can be designed in different ways. The diagonal element is particularly preferably a piston-cylinder unit, which is in particular continuously adjustable.

Alternatively, the diagonal element is a sliding tab that can be fixed in different lengths. As a result, a 0° position, a 20° position or a 40° position of the main boom extension relative to the main boom can preferably be set. Depending on the version, the adapter with a sliding lug as a diagonal can implement any other preset angle between the main boom and the main boom extension.

In an alternative embodiment, the diagonal element is a belt with a preselected length, which can be exchanged in particular for a change of position. Advantageous the preselected length of the chord corresponds to a 0° position, a 20° position or a 40° position of the main boom extension to the main boom.

A further alternative embodiment provides that the diagonal element can be adjusted, preferably steplessly, by means of a rack and pinion drive.

In a further preferred embodiment of the invention, the frame element, the rocker element, the coupling element and the crank element are of different lengths. The same length of the crank element and the link element is preferred if, for example, one wants to provide pure displacement but not a great deal of twisting of the main boom extension.

In principle, it is also conceivable to arrange several adapters one behind the other, next to one another and/or rotated, in order to increase the mobility per se or to achieve mobility in several planes.

The rigid design of the movable adapter advantageously makes it possible to design the adapter so that it can be moved under load. The positioning of the adjustable diagonal element in the diagonal of the adapter is particularly advantageous here, since when the diagonal element is actively moved under load, the main forces are conducted through the crank element and the oscillating element and the diagonal element, in particular the piston-cylinder unit, only transmits the forces transverse to the System axis must remove.

It is also conceivable, by moving the adapter, to actively pretension an external guying that acts on the main boom and/or the main boom extension.

• Figur 1 eine schematische Seitenansicht eines Fahrzeugkrans mit einem Hauptausleger und einer starren Hauptauslegerverlängerung,
• Figuren 2a bis 2c eine Detailansicht des Fahrzeugkrans gemäß Figur 1 aus dem Bereich eines Adapters zwischen dem Hauptausleger und der Hauptauslegerverlängerung in verschiedenen Stellungen,
• Figur 3 eine schematische Seitenansicht eines Fahrzeugkrans mit einem Hauptausleger und einer wippbaren Hauptauslegerverlängerung,
• Figuren 4a bis 4c eine Detailansicht des Fahrzeugkrans gemäß Figur 3 aus dem Bereich eines Adapters zwischen dem Hauptausleger und der Hauptauslegerverlängerung in verschiedenen Stellungen.

The invention is explained in more detail below using exemplary embodiments. Show it:

• figure 1 a schematic side view of a mobile crane with a main boom and a rigid main boom extension,
• Figures 2a to 2c a detailed view of the mobile crane according to FIG figure 1 from the area of an adapter between the main boom and the main boom extension in different positions,
• figure 3 a schematic side view of a mobile crane with a main boom and a luffing main boom extension,
• Figures 4a to 4c a detailed view of the mobile crane according to FIG figure 3 from the area of an adapter between the main boom and the main boom extension in different positions.

The figure 1 is a schematic and side view of a mobile crane 1, in particular a mobile crane that can be moved on public roads, which essentially consists of an undercarriage 2 and an uppercarriage 3. The undercarriage 2 has a driver's cab 4 and four vehicle axles 5, each with two roadworthy, rubber-tyred wheels 6. Of course, the undercarriage 2 can also be equipped with more or fewer than four vehicle axles 5 . The undercarriage 2 also carries the superstructure 3 which, in relation to the undercarriage 2 , can be pivoted about an essentially vertically aligned axis of rotation D by means of a pivot bearing 7 . Of course, the superstructure 3 and the undercarriage 2 can also be mounted rigidly one on top of the other. A main boom 8 that can be luffed via a luffing cylinder (not shown) is mounted on the superstructure 3 and can be fully retracted for road travel and placed on the undercarriage 2 . In the embodiment shown, the main boom 8 is designed as a telescopic boom. It is of course possible that the main boom 8 can also be designed as a lattice mast carrier and/or the mobile crane 1 can be designed as a crawler crane. The main boom 8 designed as a telescopic boom consists of a boom base box 10 and several telescopic sections 10a to 10d that can be extended and retracted and are arranged inside one another. The innermost telescopic section 10d, which is therefore the smallest in terms of its diameter, carries a main boom head 11 at its upper or outer end. The adapter 12 is designed as a cuboid lattice mast element. At the end of the adapter 12 opposite the main boom head 11, a so-called rigid main boom extension 16 is connected in a second connection level II via four additional bolts (not shown), which is aligned in the usual way only in one orientation to the main boom 8 via the adapter 12.

The adapter 12 according to the invention is designed to be movable and lockable to a limited extent in such a way that the main boom extension 16 can be connected to the adapter 12 with its longitudinal direction v in a preselected alignment with the longitudinal direction h of the main boom 8 or the adapter 12 with the connected main boom extension 16 can be aligned accordingly . In the figure 1 the main boom extension 16 is inclined at an angle b of approximately 20° to the main boom 8 .

In a preferred embodiment, the main boom 8 also includes a first guy support 18 which is arranged at the head of the boom base box 10 and points rearward at a right angle, over which a first guy rope 18a runs from the base of the base box 10 via the guy support 18 to the main boom head 11.

Usually, the main boom extension 16 is divided into a basic boom designed as a lattice mast, which is usually a framework tubular construction, and an adjoining tip 16b, which is designed as a box boom or framework tubular construction. Such main boom extensions 16 are basically constructed as a modular system from individual main elements and can be put together depending on their length or load capacity. The individual main elements have transportable dimensions and in most cases are not carried along with the mobile crane 1 but are transported separately. If the axle loads of the mobile crane 1 and the size of the main boom extension 16 allow it, the main boom extension 16 can be carried along if necessary.

In the Figures 2a, 2b and 2c 12 is a detailed view of the adapter 12 of the mobile crane 1 according to FIG figure 1 shown in three different positions. The adapter 12, which is designed in the form of a truncated pyramid or trapezoidal prism and preferably as a lattice mast element, consists of a crank element 13a arranged on the right, a rocker element 13b arranged on the left, and a frame element arranged on the bottom 13c and a top arranged coupling element 13d, which in the form of a four-bar linkage in the manner of a double rocker with each other via rotatable joints A, B, C and D are connected. Spatially, the two opposite crank elements 13a, of which the Figures 2a to 2c show only the front, connected to a rear frame via upper and lower cross members, not shown. The same applies to the two rocker elements 13b, which are connected to a front frame via cross members, which are also not shown. The front frame and the rear frame are then connected to the adapter 12 via the two frame elements 13c and the two coupling elements 13d.

The geometric relationships, in particular the lengths of the crank element 13a, the rocker element 13b, the frame element 13c and the coupling element 13d to each other are selected such that in a 0° position or basic position of the main boom extension 16 to the main boom 8, a first connection plane I parallel to a second connection level II runs. The two first articulation axes A, the two fourth articulation axes D and also the two frame elements 13c with their longitudinal extension are located in the first connection plane I. The two second articulation axes B, the two third articulation axes C and also the two coupling elements 13d with their longitudinal extension are located in the second connection plane II. from the associated Figure 2a it can be seen that due to the mutually parallel connection planes I and II and the different lengths of the crank element 13a and the rocker element 13b, the longitudinal extent v of the main boom extension 16 runs parallel to the longitudinal extent h of the main boom 8 and is not aligned with one another, but offset laterally with respect to one another - Seen in a side view of the main boom 8 are. The rocker element 13a and the coupling element 13d are here in particular of unequal length and arranged at an acute angle to one another. In contrast to a conventional four-bar linkage, the crank element 13a and also the oscillating element 13b are not arranged circumferentially, but only pivot about the associated joint axes A and D in order to bring about the desired displacement of the connection plane II to the connection plane I.

In order to limit the mobility of the adapter 12 or to set the alignment of the connection level II to the connection level I, at least one diagonal element 14 is provided, which is in a diagonal of the is arranged by the elements 13a to 13d formed four-bar linkage. For this purpose, the diagonal element 14 engages on the one hand in an articulated manner in the region of the articulation axis A on a lug of the oscillating element 13b and on the other hand in an articulated manner in the region of the articulation axis C on a lug of the crank element 13a. In the present exemplary embodiment, a front and a rear diagonal element 14 are provided in the front and the rear four-bar linkage of the adapter 12, respectively. In principle, the use of only one diagonal element 14 is also possible, which is then preferably arranged centrally in the adapter 12 . It is also possible to rotate the diagonal element 14 by approx. 90 degrees and thus connect it to a bracket of the crank element 13a in an articulated manner in the area of the joint axis D on the one hand and to a bracket of the oscillating element 13b in the area of the joint axis D on the other hand.

The diagonal element 14 is preferably designed as a sliding tab that can be fixed in different lengths using bolts. A design as a set of rods, each with a fixed length, is also conceivable. It is also advantageously possible to form the diagonal element 14 as a hydraulically driven piston-cylinder unit, which is then hydraulically locked in the desired lengths via corresponding valves. The length of the diagonal element 14 can also be adjusted and fixed by means of a toothed rail and a toothed wheel drive meshing with it. The diagonal element 14 also causes the adapter 12 to be stiffened.

In the Figures 2a to 2c a lattice piece from the foot area of the main boom extension 16 is shown schematically, which is connected via tabs and corresponding bolts (not shown) to the adapter 12, in particular to the coupling element 13d. As a result, the longitudinal direction v of the main boom extension 16 is then aligned at right angles to the coupling element 13d. The lattice piece of the main boom extension 16, shown schematically as a rectangle, is part of the lattice mast-like design of the main boom extension 16 in the usual way.

The Figure 2a shows the adapter 12 in a basic position, which is a 0° position in relation to the parallel alignment of the longitudinal direction h of the main boom 8 to the longitudinal direction v of the main boom extension 16 Main boom extension 16 corresponds. Here, the diagonal element 14 has its shortest length. Also shows the Figure 2a that the central longitudinal direction v of the main boom extension 16 is offset laterally to the left of the central longitudinal direction h of the main boom 8 and that a central longitudinal direction v of the main boom extension 16 is approximately in extension of an upper side of the main boom 8. The adapter 12 itself is inclined to the left, in particular in relation to its crank element 13a and its oscillating element 13b. In order to be able to attach the main boom extension 16 to the main boom 6 in other orientations in addition to the 0° position, the adapter 12 can be pivoted laterally as described above. As a result, the second connection level II shifts laterally to the first connection level I and, starting from the parallel basic position, tilts at any angle, preferably into the usual 20° position or 40° position. The same then applies to the alignment of the longitudinal direction v of the main boom extension 16 to the longitudinal direction h of the main boom 8. The articulation points B and C as well as the crank element 13a, the oscillating element 13b and the coupling element 13d shift in the manner of the double rocker. The pivot points A and D and the frame element 13c do not change their position on the main boom 6 or the main boom head 11.

In the Figure 2b the adapter 12 is shown in a 20° position of the main boom extension 16. In this case, the diagonal element 14 has a longer length than in the 0° position. Also shows the Figure 2b that the central longitudinal direction v of the main boom extension 16 is arranged in the foot piece 16a approximately in extension of the central longitudinal direction h of the main boom 8 . The adapter 12 itself is in this case, in particular with regard to its crank element 13a and its oscillating element 13b, almost upright, albeit in each case inclined to the left or right.

The Figure 2c shows the adapter 12 in a 40° position of the main boom extension 16. Here the diagonal element 14 has its longest length. Also shows the Figure 2c that the central longitudinal direction v of the main boom extension 16 is offset to the right laterally to the central longitudinal direction h of the main boom 8 and that a central longitudinal direction v of the main boom extension 16 on the base piece 16a is approximately in Extension of a bottom of the main boom 8 is located. The adapter 12 itself is inclined to the right, in particular with regard to its crank element 13a and its oscillating element 13b.

By placing the adapter 12 between the main boom 8 and the main boom extension 16, it is possible to bend the main boom extension 16 relative to the main boom 8 by using diagonal elements 14 of different lengths.

The figure 3 FIG. 1 shows a schematic side view of the mobile crane 1 with a main boom 8 according to FIG figure 1 , on which instead of a rigid main boom extension 16 a luffing main boom extension 16 is arranged. With regard to the corresponding parts of the mobile crane 1, the above description is therefore applied figure 1 referred. Only the differences are discussed below.

In order to achieve the luffing ability of the main boom extension 16 , the lattice mast-like base piece 16a is wedge-shaped in the manner of a flat tip with a tip directed in the direction of the main boom 8 . In the area of the tip, the rocking axis w runs over the entire width of the foot piece 16a, which is formed from one or more bolt connections. Here, the luffing axis w is aligned transversely to the longitudinal direction h of the main boom extension 16 and largely horizontally. It can also be seen that the rocking axis w is arranged approximately in the middle in relation to the front and rear of the adapter 12 .

In addition to the already in figure 1 described guying of the main boom 8 with the first guy support 18 comprises the embodiment according to figure 3 a second guying of the main boom extension 16. For this purpose, a second guying support 19a and a third guying support 19b are connected in the area of the luffing axis w. A guy cable 19c is guided from the superstructure 3 to the guy support 19b and guy rods to a point approximately in the middle of the main boom extension 16 . The main boom extension 16 is also actively luffed under load via this guy rope 19c.

In the Figures 4a, 4b and 4c is a detailed view of the adapter 12 of the Mobile crane 1 according figure 3 shown in three different positions, the adapter 12 having a hydraulic piston/cylinder unit as the diagonal element 14 instead of the diagonal element 14 with a fixed or fixed length. In relation to the matching parts of the adapter 12 is therefore on the above description of the Figures 2a, 2b and 2c referred. Only the differences are discussed below. In addition, the second and third guy supports 19a, 19b are shown in FIGS Figures 4a to 4c not illustrated.

Furthermore, from the Figures 4a, 4b and 4c seen that contrary to in the figure 3 In the embodiment shown, the luffing axis w is not in the middle between the second articulation axis B and the third articulation axis C, but rather in the area of the front third articulation axis C, preferably even slightly forward over the third articulation axis C and thus the edge of the adapter 12 and the main boom head connected underneath 11 is arranged outstanding. The arrangement of the luffing axis w allows the main boom extension 16 to be set up, in which the main boom extension 16 hangs vertically downwards on the erected main boom 8 . This position of the main boom extension 16 is in the Figure 4c implied.

As previously stated, the adapter 12 according to the Figures 4a to 4c a diagonal element 14 designed as a piston-cylinder unit in order to allow a stepless luffing of the main boom extension 16 about the luffing axis w in active operation. Like the Figures 2a to 2c is the adapter 12 in the Figures 4a to 4c shown in a 0° position, a 20° position and a 40° position. Accordingly, the diagonal element 14 is extended to different extents. In the Figure 4b the diagonal element 14 has been extended a little and is no longer in the almost completely extended position, as shown in Figure 4c is shown.

In the Figure 4c The representation shown corresponds to the 40° position of the main boom 8, adapter 12 and main boom extension 16. The diagonal element 14 is retracted a further piece for this purpose.

The present invention is above in connection with a mobile crane a telescoping main boom 8 and a lattice mast-like main boom extension 16 have been described. Since the core of the invention relates to the pivotable design of the adapter 12, the idea can also be transferred to other designs and combinations of main boom 8 and main boom extension 16 and to other vehicle cranes 1 such as a crawler crane.

In the above exemplary embodiments, the frame element 13c, the rocker element 13b, the coupling element 13d and the crank element 13a are each described as having different lengths. Seen in the side view, a parallelogram-like design of the adapter 12 is also conceivable, in which at least the crank element 13a and the oscillating element 13b have the same length. The main boom extension 16 can then be moved laterally and without seesaws to the main boom 8 via this adapter 12 . This embodiment could be useful in connection with a luffing main boom extension 16 .

With regard to the adapter 12, it should be noted that its function is retained even if the frame element 13c arranged below is replaced by the main boom head 11. Furthermore, its function is retained if the coupling element 13d is replaced by other components, such as an additional adapter piece or the foot piece 16a.

Reference List

1

mobile crane

2

undercarriage

3

superstructure

4

driver's cabin

5

vehicle axles

6

Tires

7

pivot bearing

8th

main boom

10

boom base box

10a

first telescopic shot

10b

second telescopic shot

10c

third telescopic shot

10d

fourth telescopic shot

11

main boom head

12

adapter

13a

crank element

13b

vibrating element

13c

frame element

13d

coupling element

14

diagonal element

15

foot articulation adapter

16

main boom extension

16a

base

16b

Top

17

Floor

18

first guy support

18a

guy rope

19a

second guy support

19b

third guy support

19c

guy rope

A

first joint axis

B

second joint axis

C

third axis of articulation

D

fourth axis of articulation

b

angle

H

Longitudinal direction of the main boom

L

longitudinal axis

v

Longitudinal direction of the main boom extension

w

rocking axis

I

first connection level

II

second connection level

Claims (13)

1. A vehicle-mounted crane (1), in particular mobile crane or crawler crane, having a main boom (8), a main boom extension (16) and an adapter (12) which is arranged between the main boom (8) and the main boom extension (16) and has a first connection plane (I) and a second connection plane (II), the adapter (12) being designed as a double rocker, the first connection plane (I) being arranged such that it can be displaced laterally relative to the second connection plane (II),
   characterised in that the first connection plane (I) is arranged such that it can be angled relative to the second connection plane (II).
2. The vehicle-mounted crane (1) according to claim 1, characterised in that the adapter (12) is fastened with its first connection plane (I) indirectly to a main boom head (11) of the main boom (8) and is fastened with its second connection plane (II) indirectly to a foot piece (16a) of the main boom extension (16).
3. The vehicle-mounted crane (1) according to claim 1 or 2, characterised in that the adapter (12) is fastened with its first connection plane (I) directly to a main boom head (11) of the main boom (8) and/or is fastened with its second connection plane (II) directly to a foot piece (16a) of the main boom extension (16).
4. The vehicle-mounted crane (1) according to one of claims 1 to 3,
   characterised in that the adapter (12), viewed transversely and laterally with respect to a longitudinal direction (L) of the main boom (8), consists of a frame element (13c), a swing element (13b), a coupling element (13d) and a crank element (13a), which are connected in a rotary manner via first, second, third and fourth articulation spindles (A, B, C, D) extending in parallel with one another and a diagonal element (14) is arranged between two diagonally opposite articulation spindles (A, C or B, D), with which element the adapter (12) is fixed.
5. The vehicle-mounted crane (1) according to one of claims 1 to 4,
   characterised in that the first and fourth articulation spindles (A, D) lie in the first connection plane (I) and the second and third articulation spindles (B, C) lie in the second connection plane (II).
6. The vehicle-mounted crane (1) according to claim 4 or 5, characterised in that the diagonal element (14) is a piston-cylinder unit, in particular one that is continuously adjustable.
7. The vehicle-mounted crane (1) according to claim 4 or 5, characterised in that the diagonal element (14) is a sliding tab that can be locked into different lengths.
8. The vehicle-mounted crane (1) according to claim 4 or 5, characterised in that the diagonal element (14) is a replaceable belt of preselected length.
9. The vehicle-mounted crane (1) according to claim 4 or 5, characterised in that the diagonal element (14) is adjustable by means of a toothed rail and gear drive.
10. The vehicle-mounted crane (1) according to at least one of claims 4 to 9, characterised in that the frame element (13c), the swing element (13b), the coupling element (13d) and the crank element (13a) are of different lengths.
11. The vehicle-mounted crane (1) according to at least one of claims 1 to 10, characterised in that a plurality of adapters (12) are arranged one behind the other, next to one another and/or are arranged so as to be rotated.
12. The vehicle-mounted crane (1) according to at least one of claims 1 to 11, characterised in that the adapter (12) is movable under load.
13. The vehicle-mounted crane (1) according to at least one of claims 1 to 12, characterised in that an outer guying arrangement engaging the main boom (8) and/or the main boom extension (16) can be actively pretensioned via a movement of the adapter (12).

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