MOBILE CRANE WITH A LUFFING MAIN BOOM AND WITH AN ADDITIONAL BOOM SYSTEM

Abstract

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

Claims

1. A vehicle crane comprising: a luffable main jib and an additional jib system arranged on a free end section of the main jib and comprising a first additional jib part and a second additional jib part; wherein the first additional jib part has a rectangular cross-section having four longitudinal chords connected together via transverse struts and/or diagonal struts, and wherein the second additional jib part has a triangular cross-section having three longitudinal chords connected together via transverse struts, and wherein the two additional jib parts are configured to be coupled together via a cross-section change adapter.

2. The vehicle crane as claimed in claim 1 further comprising a hinge assembly, and wherein the first additional jib part and/or the second additional jib part is/are supported on the cross-section change adapter so as to be pivotable via the hinge assembly.

3. The vehicle crane as claimed in claim 2, wherein at least one linear drive is provided by which the first additional jib part and/or the second additional jib part can be actively pivoted with respect to the cross-section change adapter.

4. The vehicle crane as claimed in claim 3, wherein the first additional jib part and/or the second additional jib part can be actively pivoted with respect to the cross-section change adapter about the hinge assembly by the at least one linear drive.

5. The vehicle crane as claimed in claim 1, wherein the first additional jib part and the second additional jib part are each rigidly fastened to the cross-section change adapter.

6. The vehicle crane as claimed in claim 1, wherein the additional jib system is guyed via a guying system, wherein the guying system is connected by an intermediate guying support to the first additional jib part and/or the second additional jib part and/or the cross-section change adapter.

7. The vehicle crane as claimed in claim 1, wherein a length of the first additional jib part is 4.0 m to 150.0 m.

8. The vehicle crane as claimed in claim 7, wherein the length of the additional jib part is 5.0 m to 65.0 m.

9. The vehicle crane as claimed in claim 1, wherein the first additional jib part and the second additional jib part are or form a common component of an auxiliary jib

10. The vehicle crane as claimed in claim 9, wherein the auxiliary jib is free of a guying system and/or is luffable.

11. The vehicle crane as claimed in claim 1, wherein the first additional jib part is a main jib extension.

12. The vehicle crane as claimed in claim 1, wherein the second additional jib part is an auxiliary jib.

13. The vehicle crane as claimed in claim 1, wherein the cross-section change adapter includes a first connection side formed for coupling to the first additional jib part and a second connection side formed for coupling to the second additional jib part; wherein the first connection side thereof has four corner regions spanning a rectangular or quadratic plane there between and the second connection side thereof has three corner regions spanning a triangular plane there between; wherein two upper corner regions of the first connection side provided for arrangement in the region of an upper side of the first additional jib part are connected, in each case via an upper chord to an upper corner region of the second connection side provided for arrangement in the region of an upper side of the second additional jib part, and two lower corner regions of the first connection side provided for arrangement in the region of a lower side of the first additional jib part opposite its upper side are connected, in each case via a lower chord, to one of two lower corner regions of the second connection side provided for arrangement in the region of a lower side of the second additional jib part opposite its upper side, whilst one of the lower corner regions of the first connection side is connected to the upper corner region of the second connection side by a first transverse strut and one lower corner region of the second connection side diagonally opposite the lower corner region of the first connection side connected to the first transverse strut is connected to one of the upper corner regions of the first connection side by a second transverse strut, and two of the diagonally opposite lower corner regions of the first connection side and of the second connection side are connected together by a third transverse strut.

14. The vehicle crane as claimed in claim 13, wherein in relation to the first connection side, its lower corner region connected to the first transverse strut and its upper corner region connected to the second transverse strut or its lower corner region which has no direct connection to the first transverse strut and its upper corner region which has no direct connection to the second transverse strut are connected together by a diagonal strut.

15. The vehicle crane as claimed in claim 1, wherein the main jib is a telescoping jib or a lattice mast jib.

16. The vehicle crane as claimed in claim 1, wherein a lifting cable is guided above the additional jib system.

17. A vehicle crane comprising: a luffable main jib and an additional jib system arranged on a free end section of the main jib and comprising a first additional jib part and a second additional jib part, wherein the first additional jib part is a main jib extension, and wherein the second additional jib part is an auxiliary jib; wherein the first additional jib part has a rectangular cross-section having four longitudinal chords connected together via transverse struts and/or diagonal struts, and wherein the second additional jib part has a triangular cross-section having three longitudinal chords connected together via transverse struts, and wherein the two additional jib parts are configured to be coupled together via a cross-section change adapter.

18. The vehicle crane as claimed in claim 17, further comprising a hinge assembly, and wherein the first additional jib part and/or the second additional jib part is/are supported on the cross-section change adapter so as to be pivotable via a hinge assembly, and wherein at least one linear drive is provided by which the first additional jib part and/or the second additional jib part can be actively pivoted with respect to the cross-section change adapter about the hinge assembly.

19. The vehicle crane as claimed in claim 17, wherein the first additional jib part and the second additional jib part are each rigidly fastened to the cross-section change adapter.

20. The vehicle crane as claimed in claim 17, wherein the additional jib system is guyed via a guying system, wherein the guying system is connected by an intermediate guying support to the first additional jib part and/or the second additional jib part and/or the cross-section change adapter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 shows a vehicle crane in accordance with the invention having an additional jib system in accordance with the invention in a side view;

[0038] FIG. 2 shows the vehicle crane in accordance with the invention in a first alternative design having a first alternative of the additional jib system in an otherwise identical illustration;

[0039] FIG. 3 shows the vehicle crane in accordance with the invention in a second alternative design having the additional jib system with a luffable foot piece in an otherwise identical illustration;

[0040] FIG. 4 shows the vehicle crane in accordance with the invention in a third alternative design having an alternative guying arrangement of the additional jib system in an otherwise identical illustration; and

[0041] FIG. 5 shows a section of the additional jib system in accordance with the invention showing its cross-section change adapter in accordance with the invention in a perspective illustration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] FIG. 1 shows the structure of a vehicle crane 1 in accordance with aspects of the present invention in which the crane 1 is parked on a ground U and comprises in the exemplified embodiment illustrated here a telescopic main jib 2 and in this respect a telescoping jib with boxes 2a-2c arranged one inside the other and longitudinally displaceable relative to each other. Purely by way of example, in the present case one basic box 2a and two inner boxes 2b and 2c are shown. Alternatively, the main jib 2 can, of course, also be designed as a lattice mast jib (not shown here). The vehicle crane 1 has a lower carriage 3, oriented in the present case in parallel with a horizontal direction X, with a driver's cabin 3a which has a wheeled running gear unit 4 with, here by way of example, four axles 4a-4d, on each of which at least two rubber-tired wheels 5 spaced apart from each other in parallel with a transverse direction Y are rotatably arranged. Seated on the lower carriage 3 is a superstructure 6, supporting the main jib 2, which can be rotated relative to the lower carriage 3 about an axis of rotation Z1 extending in parallel with an upwards direction Z. The telescoping jib 2 extending in its longitudinal direction X1 is articulated on the superstructure 6 so as to be luffable via a horizontal pivot axis Y1 typically in an angular range of −4° to 87°. Therefore, the telescoping jib 2 is not vertical compared with a tower crane.

[0043] As can be seen, the main jib 2 is extended by an additional jib system 7 in accordance with the invention. In the present case, and purely by way of example, this is coupled to a jib head 9 of the main jib 2 with interpositioning of an adapter 8. Depending upon the design, the additional jib system 7 can also be coupled directly to the jib head 9 in a manner not shown in more detail here. In this case and purely by way of example, the adapter 8 is configured such that the additional jib system 7 extending in its longitudinal direction X2 is bent with respect to the longitudinal direction X1 of the main jib 2. The additional jib system 7 arranged in this respect at a free end section E of the main jib 2 includes a first additional jib part T1 and a second additional jib part T2, the first additional jib part T1 having a rectangular cross-section which cannot be seen in more detail here whilst the second additional jib part T2 has a triangular cross-section which likewise cannot be seen in more detail here. The two additional jib parts T1 and T2 are coupled together via a cross-section change adapter 10 in accordance with the invention, details of which are shown in more detail in FIG. 5. The two additional jib parts T1 and T2 form a common component of an auxiliary jib.

[0044] In a typical manner, a lifting cable extends, starting from a lifting mechanism winch, not shown, on the superstructure 6, above the main jib 2 and above the additional jib system 7 to a head of the additional jib system 7 and is deflected at that location in order to receive a hook 16 at its free end. The same applies for FIGS. 2 to 4.

[0045] FIG. 2 shows an alternative embodiment of the vehicle crane 1 with an additional jib system 7 which is likewise configured in an alternative manner. The additional jib system 7 is coupled to the jib head 9 of the main jib 2 directly via its first additional jib part T1. Without the adapter 8, the first additional jib part T1 now extends in parallel with or coaxially with respect to the longitudinal direction X1 of the main jib 2, whilst the second additional jib part T2 is bent in its longitudinal direction X3 with respect to the first additional jib part T1. In this respect, the second additional jib part T2 is pivotably supported on the cross-section change adapter 10 via a hinge assembly 11. A linear drive 12 acting between the cross-section change adapter 10 and the second additional jib part T2 is used to pivot the second additional jib part T2 about the hinge assembly 11 as required actively with respect to the cross-section change adapter 10. The first additional jib part T1 hereby forms a main jib extension, whilst the second additional jib part T2 is an auxiliary jib which can pivot with respect thereto.

[0046] FIG. 3 shows a further, second alternative embodiment of the vehicle crane 1, the additional jib system 7 of which substantially corresponding to the above description. In order to achieve a further extension of the main jib 2, the additional jib system 7 is connected to the main jib 2 with the incorporation of a luffable foot piece 13. In turn, the luffable foot piece 13 is coupled to the jib head 9 via the adapter 8. For the purposes of stabilization and luffing, the vehicle crane 1 illustrated here additionally has a guying arrangement or guying system 14. In the present case, and purely by way of example, this includes a tensile means or tensioner 14a that comprises a tensile member or members, such as a rod, cable, band or chain, such as in a row and combinations thereof, and includes two guying supports 14b and 14c, via which the tensile means 14a is supported on the adapter 8 and on the luffable foot piece 13. The tensile means 14a is connected on the one hand to the superstructure 6 and on the other hand to the additional jib system 7, where it is connected purely by way of example to the cross-section change adapter 10.

[0047] FIG. 4 shows a last alternative embodiment of the vehicle crane 1 which corresponds substantially to the embodiment shown in FIG. 3. In contrast thereto, the guying arrangement or guying system 14 is configured differently, in that the tensile means 14a thereof is further supported via the support or guying support 14c arranged on the adapter 8, whilst its further transverse guying arrangement 14b is connected to the cross-section change adapter 10 as a tensile member. Of course, this transverse guying arrangement 14b in the form of a support can also be provided on other components.

[0048] In all of the embodiments shown herein, the first additional jib part T1 can have a length L of e.g. 4.0 m to 150.0 m. Preferably, its length L can be 5.0 m to 65.0 m.

[0049] FIG. 5 shows a section of the additional jib system 7 in which its cross-section change adapter 10 is located, this adapter connecting the two additional jib parts T1 and T2 and being clearly shown here with thick lines. The figure shows the first additional jib part T1 and also the second additional jib part T2 each formed as a lattice girder which has longitudinal chords G1a-G1d; G2a-G2c extending in parallel with their respective longitudinal directions X2 and X3 and transverse struts Q1a-Q1h; Q2a-Q2h connecting the longitudinal chords together and also diagonal struts D1a, wherein in the present case by way of example only one diagonal strut D1a of the first additional jib part T1 can be seen. The illustration shows the rectangular cross-section of the first additional jib part T1 and the triangular cross-section of the second additional jib part T2.

[0050] The cross-section change adapter 10 has a first connection side S1 coupled to the first additional jib part T1 and a second connection side S2 coupled to the second additional jib part T2. With reference to the illustration in FIG. 5, its first connection side S1 is located on the left-hand side and the second connection side S2 is located on the right-hand side. In the present case, the two connection sides S1 and S2 of the cross-section change adapter 10 extend in parallel with each other. Of course, these can also be inclined with respect to each other in a manner not shown in more detail, in order to incline the additional jib parts T1 and T2 with respect to each other. Owing to the aim of coupling to the first additional jib part T1, the first connection side S1 has a total of four corner regions E1a-E1d which span a correspondingly rectangular surface there between. Of these corner regions, two upper corner regions E1b and E1c are located on an upper side O1 of the first additional jib part T1, whilst the other two lower corner regions E1a and E1d are located on a lower side U1 of the first additional jib part T1 opposite the upper side O1. In contrast, the second connection side S2 provided for coupling to the second additional jib part T2 has a total of three corner regions E2a-E2c, which span a correspondingly triangular plane there between. Of these corner regions E2a-E2c, only one upper corner region E2b is located on an upper side O2 of the second additional jib part T2, whilst the remaining two lower corner regions E2a and E2c are located on a lower side U2 of the second additional jib part T2 opposite the upper side O2.

[0051] Looking at the design of the cross-section change adapter 10, it is clear that the two upper corner regions E1b and E1c of its first connection side S1 are connected to the upper corner region E2b of its opposite second connection side S2 in each case by an upper chord Oa and Ob. Said upper chords Oa and Ob thus form a quasi V-shape there between, the tip of which points towards the second connection side S2. Furthermore, the two lower corner regions E1a, E1d of the first connection side S1 are connected to one of the two lower corner regions E2a, E2c of the second connection side S2 by a lower chord Ua, Ub in each case. The two lower chords Ua, Ub extend with respect to each other such that they connect the directly opposite lower corner regions E1a, E2a; E1d, E2c of the two connection sides S1, S2 to each other and in this respect do not cross. In order to stiffen and further stabilize the cross-section change adapter 10 in particular with respect to movements, one of the lower corner regions E1d of the first connection side S1 is connected to the single upper corner region E2b of the second connection side S2 by a first transverse strut Qa. A further second transverse strut Qb is used for stiffening the opposite side of the cross-section change adapter 10 in that it connects the lower corner region E2a of the second connection side S2—diagonally opposite the lower corner region E1d of the first connection side S1 connected to the first transverse strut Qa—to the upper corner region E1b of the first connection side S1. A third transverse strut Qc connects the two diagonally opposite lower corner regions E1d, E2a of the first connection side S1 and the second connection side S2 to each other. In relation to the first connection side S1, in the present case the lower corner region E1a, which has no direct connection to the first transverse strut Qa and the upper corner region E1c which has no direct connection to the second transverse strut Qb are also connected together by a diagonal strut Da. Of course, the transverse struts Qa and Qb can also be arranged in a mirror-symmetrical manner and so the corner region E2b is connected to the two corner regions E1d and E1a. Alternatively, the surfaces which include E1a, E1b, E2a, E2b and E1c, E1d, E2b, E2c can be stiffened with a plurality of transverse struts.

[0052] The cross-section change adapter 10 can have further transverse struts Qd-Qg on its first connection side S1—as shown by way of example in FIG. 5—which struts are used to connect two corner regions E1a, E1b; E1b, E1c; E1c, E1d; E1d, E1a in each case. This can also be present on the second connection side S2, and so the corner regions E2a, E2b; E2b, E2c; E2c, E2a located there can also be connected together in each case via a transverse strut Qh-Qj.

[0053] Owing to the arrangement or/and design of the upper chords Oa and Ob and lower chords Ua and Ub and the transverse struts Qa-Qc, the longitudinal directions X2 and X3 of the two additional jib parts T1 and T2 can extend either congruently, and in this respect coaxially, non-parallel or else offset with respect to each other, as shown purely by way of example in FIG. 5. Furthermore, the vertical and/or horizontal dimensions on connection side S1 and connection side S2 can have different or identical orders of magnitude.

[0054] In an embodiment which is alternative to the previously described variant, the additional jib system can be rotated about its longitudinal axis by 180 degrees. In this way, the second triangular additional jib system T1 would then only have one lower chord, but two upper chords. It is also feasible for the cross-section change adapter 10 to be an integral component of the first additional jib part T1 or of the second additional jib part T2. The first additional jib part T1 could also be formed as a box girder.

[0055] Changes and modifications in the specifically described embodiments can be carried out without departing from the principles of the present invention which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents