telescopic boom and crane

Abstract

The present invention relates to a telescopic boom with a rocker element for rocking the telescopic boom, a pivot point and a support element, wherein the support element is arranged at least on the underside of the pivot point and has a receptacle designed for fastening the rocker element, wherein the telescopic boom has one or more, in particular two, bracket elements which are arranged at least on the top side of the pivot point and are connected to the support element, such that the support element and the bracket element or bracket elements enclose the pivot point.

Description

[0001] The present invention relates to a telescopic boom with a rocker element for rocking the telescopic boom, a pivot point and a support element, wherein the support element is arranged at least on the underside of the pivot point and has a receptacle designed for fastening the rocker element.

[0002] Such telescopic booms are known from JP 2010 - 126 287 A, DE 10 2019 110 505 B3 and DE 10 2017 110 412 A1. A telescopic boom with a rocker element for rocking the telescopic boom, a pivot point and a receptacle designed for attaching the rocker element is known from CN 2 01 890 731 U, wherein the telescopic boom has all elements that are arranged at least on the upper side of the pivot point.

[0003] In the Fig. 6 and Fig. Figure 7 shows, by way of example, a crane 1000 in the form of a mobile crane, which has a chassis 1010 and a superstructure 1020, which in turn has a telescopic boom 1021 and a slewing platform 1022.

[0004] To enable the telescopic boom 1021 to be raised, a rocker cylinder 1 connects the telescopic boom 1021 and the turntable 1022. The telescopic boom 1021 has a pivot section with which the telescopic boom 1021 is articulated to the turntable 1022 via a pivot of the pivot section and several telescopic sections that can be extended from the pivot section.

[0005] At the in Fig. In the crane shown in section 6, a rocker cylinder 1 is arranged on one side of the pivot point. In the crane shown in section 6, a rocker cylinder 1 is arranged on each side of the pivot point. Fig. In the crane shown in figure 7, a rocker cylinder 1 is arranged below the pivot point.

[0006] Out of Fig. Figure 8 shows that during operation of the crane 1000, very large forces can arise at or in the luffing cylinder 1 due to a lifting load arranged on the telescopic boom 1021 and its leverage effect. To introduce these large forces into the telescopic boom 1021, a luffing cylinder housing 2, designed as a sheet metal construction, is welded to it. The luffing cylinder housing 2 is also shown in Fig. 6 is marked. The rocker cylinder 1 is articulated to the rocker cylinder housing 2. Due to the lifting load being spaced away from the turntable 1022, a load moment is created in the telescopic boom 2021, which loads the telescopic boom 1021.

[0007] The telescopic boom 1021, which has an approximately circular cylindrical cross-section, absorbs the resulting load moment via the compressive force 5 in the rocker cylinder 1 and the rocker cylinder box 2, as well as a linkage in the form of a bolted connection at the end of the telescopic boom 1021 to the rotary platform 1022.

[0008] In large cranes, a rocker cylinder 1 is attached to one side of the rocker cylinder housing 2 or the telescopic boom 1021 in order to allow the largest possible cross-sectional area (in height and width) for the telescopic boom 1021.

[0009] Depending on the position of rocker cylinder 1 or rocker cylinders 1, the design of the rocker cylinder box 2 is adapted. Fig. Figure 8 shows that the rocker cylinder 1 is at an angle 74° to the telescopic boom 1021. The compressive force 5 can thus be resolved into a force along the telescopic boom 1021 and a force acting transversely to the telescopic boom 1021 along the vertical axis.

[0010] As can be seen in particular from the Fig. 9 and Fig. As can be seen from Figure 11, the pivot section 7 of the telescopic boom 1021 has two side walls 4. The pivot section 7 is a telescopic boom profile of the telescopic boom 1021.

[0011] The compressive force 5 of each rocker cylinder 1 is introduced laterally at the pivot point 7 of the telescopic boom 1021.

[0012] The compressive force 5 of each rocker cylinder 1 is transmitted via a lateral mounting in the form of a bolt mount and / or linkage, which is in Fig. The rocker cylinder mount 21 shown in section 9 is initiated by the compressive force 5, which acts at an angle 74 to the longitudinal axis 71 of the pivot point 7 of the telescopic boom 1021, as shown in the diagram. Fig. As can be seen from Figure 8, a flexing moment 51 arises about the vertical axes 52 on the side walls 4 of the pivoting section 7 and the telescopic boom 1021, respectively, which is in the Fig. 10 and Fig. 11 is shown.

[0013] The pivot shot 7 is subjected to a compressive load 41 and a tensile load 42 resulting from the flexing moment 51, which in Fig. Figure 11, illustrated by arrows, is subjected to loads. These loads 41 and 42 are absorbed by the side walls 4 of the pivoting section 7. This absorption of loads 41 and 42 is made possible by a sheet metal construction of the rocker cylinder housing 2 that is optimized for force flow.

[0014] According to the prior art, various forms of rocker cylinder housings 2 are known, which, as a sheet metal construction, form a kind of half-shell in which the pivoting section 7 is located and which is connected to the pivoting section 7 almost all around by means of welds 31, as shown from Fig. 9 emerges.

[0015] Depending on the position of the rocker cylinder mounting 21 and with a corresponding lifting load, the load from the compressive load 41, the tensile load 42 and the twisting moment 51 can lead to overloading of the pivot joint 7.

[0016] The left cross-sectional view in Fig. Figure 1a shows the cross-section of a telescopic boom of a smaller crane 1000 with only one rocker cylinder 1 connected by means of a rocker cylinder mount 21 centrally below the pivot point 7. Here, the compressive force 5 can be applied by only one rocker cylinder 1. The other cross-sectional views in Fig. Figure 1a shows the solution for a crane 1000 with two rocker cylinder mounts 21 or rocker cylinders 1. Here, the compressive force 5 cannot be applied by just one rocker cylinder 1.

[0017] Depending on the crane, the force application of the rocker cylinder(s) 1 or the rocker cylinder mounting 21 is positioned differently.

[0018] The middle cross-sectional view in Fig. Figure 1a shows the cross-section of a telescopic boom of a crane 1000, wherein two rocker cylinders 1 or rocker cylinder mounts 21 are arranged laterally below the pivot section 7.

[0019] The right cross-sectional view in Fig. Figure 1a shows the cross-section of a telescopic boom of a crane 1000, wherein two rocker cylinders 1 or rocker cylinder mounts 21 are arranged laterally next to the pivot point 7.

[0020] From the Fig. Figures 12 to 15 describe a prior art linkage for a telescopic boom. This prior art linkage has a connecting element 8 for connecting or linking and / or connecting a TY bracing 9, i.e., a spatial bracing of the telescopic boom. Such a linkage also has a rocker cylinder housing 2 for dissipating the compressive forces 5 of the rocker cylinders. The compressive forces 5 are not dissipated via the connecting element 8.

[0021] The connecting element 8 does not completely encompass the linkage piece. The connecting element 8 is not closed at the lower end of the linkage piece, as can be seen from... Fig. 15. The force flow 92 for introducing the normal forces 91 of the TY bracing 9 runs only in a direction perpendicular to the pivot point, as can be seen from the Fig. 12 to 14. In contrast, the force flow of the pressure forces 5 on the rocker cylinder housing 2 runs more in the longitudinal direction of the respective pivot point.

[0022] The connecting element 8 serves to absorb the normal forces 91, which act perpendicular to the longitudinal axis 71 of the pivoting section.

[0023] When the normal forces 91 are introduced at the TY bracing 9, no twisting moment is created which can lead to large stresses in the less stiff areas of the pivot joint.

[0024] Against this background, the present invention aims to improve a telescopic boom, particularly with regard to an improved introduction of forces from a rocker element into the pivot point or the telescopic boom.

[0025] This problem is solved by the subject matter with the features of independent claim 1. Advantageous embodiments of the invention are the subject of the dependent claims.

[0026] According to the invention, the telescopic boom has one or more, in particular two, bracket elements which are arranged at least on the top of the pivot section and are connected to the support element, so that the support element and the bracket element or bracket elements enclose the pivot section.

[0027] Preferably, the support element is designed in a semi-shell shape, with the support element partially enclosing the pivot point in a cross-section.

[0028] The pivot point is preferably located in the support element.

[0029] The support element and / or the bracket elements preferably form a rocker cylinder box with lateral force application.

[0030] The support element and / or the bracket elements preferably form a rocker cylinder box enclosing the pivot point.

[0031] Preferably, the ironing element has two ends, and both ends of each ironing element are preferably arranged on the support element.

[0032] The support element can also be described as a rocker cylinder box.

[0033] The pivot piece preferably has a top, a bottom, and two sides connecting the top and bottom. The top can also be called the top wall, the bottom can also be called the bottom wall, and the sides can also be called side walls.

[0034] Preferably, the support element extends over at least a part of the underside, at least a part of the sides and / or at least a part of the top of the pivot piece, and the bracket element or one of the bracket elements extends over the part of the pivot piece over which the support element does not extend.

[0035] The support element and the bracket element(s) preferably do not completely enclose the pivot point in the longitudinal direction. In the longitudinal direction, the support element preferably has a larger extent than the bracket element(s).

[0036] It is conceivable that the support element also runs partially on the top side of the pivot point.

[0037] Preferably, the support element extends in a cross-section over at least a part of the underside, and in the cross-section over at least a part of the sides, and one of the stirrup elements extends in the cross-section over the part of the pivot section over which the support element does not extend.

[0038] Each cross-section is preferably a cross-section of the telescopic boom.

[0039] Preferably, the support element and one of the stirrup elements completely enclose the pivot point in a cross-section.

[0040] Preferably, the support element extends in a further cross-section over at least a part of the underside and in each further cross-section and / or in each longitudinal direction of the pivot section over at least a part of the sides, and a further bracket element connects to the sections of the support element, which in each further cross-section and / or in each longitudinal direction extend over at least a part of the sides, and extends over the part of the pivot section over which the support element does not extend.

[0041] Preferably, it is provided that none of the bracket elements is directly connected to the pivot point, in particular welded, and / or that none of the bracket elements is completely connected to the pivot point, in particular welded, and / or that one or more gaps are present between the respective bracket element and the pivot point.

[0042] Preferably, the support element has a further receptacle, in particular one identical in construction to the aforementioned receptacle, which is designed for attaching a rocker element, wherein the support element is further arranged at least partially on both sides of the pivot point and / or further at least partially on the top of the pivot point, wherein one of the receptacles is located on one side of the pivot point on the support element and the other receptacle is located on the other side of the pivot point on the support element.

[0043] Each mounting point can be a bolt mounting point.

[0044] Preferably, each ironing element is identical or different in construction and / or designed in a box construction and / or has an elongated section and two shorter sections angled from it.

[0045] Preferably, both ends, especially the shorter sections, of each stirrup element are connected to the support element, in particular welded.

[0046] Preferably, it is provided that several ribs, in particular extending in the longitudinal direction of the pivot point, e.g. triangular, are connected, in particular welded, to the support element at the rear and front, and are also connected, in particular welded, to the pivot point.

[0047] Preferably, the supporting element is designed in a box construction and / or is fully or partially connected to the pivot point, in particular welded.

[0048] Preferably, each inlet is arranged in an upper quarter, fifth or sixth of the pivot shot, preferably above a neutral fiber of the pivot shot.

[0049] Preferably, the supporting element and each stirrup element are made of sheet steel and are designed as welded constructions.

[0050] The invention also relates to a crane, in particular a mobile crane with a telescopic boom according to the invention.

[0051] The crane, in particular a mobile crane, preferably has a turntable, wherein the telescopic boom is pivotally connected to the turntable, wherein the crane has a length-variable rocker element which has two ends and one end is pivotally connected to a receptacle of the support element and the other end to the turntable, wherein the telescopic boom can be rocked relative to the turntable by changing the length of the rocker element.

[0052] Each rocker element is preferably a rocker cylinder, in particular a hydraulic cylinder.

[0053] Preferably, the crane is provided to have a chassis and the turntable is rotatably arranged on the chassis.

[0054] Preferably, the crane is provided to have a further, in particular a length-variable rocking element identical in construction to the aforementioned rocking element, which has two ends and one end is articulated to a receptacle of the support element and the other end to the slewing platform, wherein the telescopic boom can be rocked relative to the slewing platform by changing the length of the rocking elements, wherein one of the rocking elements is arranged on one side of the telescopic boom at a receptacle of the support element and the other rocking element is arranged on the other side of the telescopic boom at a receptacle of the support element.

[0055] It should be noted here that the terms "a" and "an" do not necessarily refer to exactly one of the elements, although this is a possible interpretation, but can also denote a plurality of elements. Likewise, the use of the plural also includes the presence of the element in question in the singular, and conversely, the singular also includes several of the elements in question. Furthermore, all features of the invention described herein can be combined with one another or claimed separately from one another as desired.

[0056] Further advantages, features, and effects of the present invention will become apparent from the following description of preferred embodiments with reference to the figures, in which identical or similar components are designated by the same reference numerals. These figures show: Fig. 1: a cross-sectional view of a prior art telescopic boom and a cross-sectional view of an embodiment of a telescopic boom according to the invention. Fig. 1a: Three cross-sectional views of telescopic booms from the state of the art. Fig. 2: a perspective view of an embodiment of a telescopic boom according to the invention. Fig. 3: A perspective view of an embodiment of a telescopic boom according to the invention. Fig. 3a: a sketch of an embodiment of a telescopic boom from the prior art. Fig. 4: A cross-sectional view of an embodiment of a telescopic boom according to the invention. Fig. 5: a detail of the cross-sectional view from Fig. 4. Fig. 6: A perspective view of a crane from the state of the art. Fig. 7: A side view of a state-of-the-art crane. Fig. 8: a sketch of components of a crane from the state of the art. Fig. 9: A perspective view of a prior art telescopic boom. Fig. 10: A top view of a prior art telescopic boom. Fig. 11: A perspective view of a prior art telescopic boom. Fig. 12: A perspective view of a prior art telescopic boom. Fig. 13: A perspective view of a prior art telescopic boom. Fig. 14: A perspective sectional view of a prior art telescopic boom. Fig. 15: A perspective sectional view of a prior art telescopic boom. Fig. 16: A perspective sectional view of a prior art telescopic boom.

[0057] In Fig. Figure 1 shows a cross-section of a telescopic boom with a pivoting section 7 and a support element in the form of a rocker cylinder box 2, which has two rocker cylinder mounts 21, wherein the rocker cylinder box 2 extends in cross-section over the underside and over a part of the side walls 4 of the pivoting section 7.

[0058] A bracket element in the form of a bracket 6 is arranged on the upper side of the pivoting section, wherein the bracket 6 extends in cross-section over the upper side of the pivoting section 7 and over a part of the side walls 4 of the pivoting section 7 and is connected on both sides to the rocker cylinder box 2.

[0059] The rocker cylinder box 2 and one or more brackets 6 enclose the linkage 7.

[0060] The rocker cylinder housing 2 and / or the bracket(s) 6 are constructed of sheet metal.

[0061] To minimize the compressive forces 5 of the rocker cylinder 1, the rocker cylinder mount 21 of the rocker cylinder is positioned as high as possible on the side wall 4. This results in a favorable, in Fig. 8 shown, angle 74 between the direction of action of the rocker cylinder 1 and the longitudinal axis 71 of the pivot shot 7.

[0062] This favorable angle 74 reduces the necessary pressure forces 5 in crane operation and thus enables a slimmer design of the rocker cylinder 1.

[0063] The pivot joint 7 exhibits less stiffness in the area of ​​the side wall 4 due to forces acting transversely to the side wall 4 than in areas above or below.

[0064] In Fig. Figure 1 shows on the left a cross-section of a telescopic boom known from the prior art with a pivoting section 7 and a support element in the form of a rocker cylinder box 2, which has two rocker cylinder mounts 21.

[0065] In the embodiment of the telescopic boom according to the invention, the rocker cylinder mounts 21 were moved upwards compared to the telescopic boom known from the prior art. As this is shown from Fig. As can be seen from 1, a height offset of 22 results. This results in an angle of 74°. Fig. 8 further optimized and the pressure force 5 can be kept small.

[0066] In particular, to increase the load-bearing capacity of the telescopic boom while keeping the weight as low as possible, one, two or more brackets 6 are arranged above the pivot point 7.

[0067] The pivot point 7 can assume any cross-sectional profile.

[0068] The pivoting piece preferably has the form of a circular cylindrical shell in a region of a cross-section and is enclosed in at least one cross-section by the rocker cylinder box 2 and a bracket 6.

[0069] Without the bracket(s), the rocker cylinder housing would have to be constructed with correspondingly high mass to absorb the resulting compressive load 41 and tensile load 42 resulting from the twisting moment 51 of the compressive force 5 in the side wall 4 and to compensate for the lack of stiffness against loads perpendicular to the side wall 4 of the pivot point 7. This would not be feasible with an economical steel structure weight.

[0070] The rocker cylinder housing 2 absorbs compressive forces 5, preferably mainly along the longitudinal axis 71 of the pivot section 7 or telescopic boom, and transfers them into the pivot section 7. The transverse loads compression 41 and tension 42 resulting from the compressive load and the resulting rolling moment are absorbed by the stirrups 6.

[0071] The resulting twisting moment 51, as explained above, results in tensile loads 53 and compressive loads 54, as can be seen from Fig. 3 emerges.

[0072] Through the rocker cylinder housing 2, tensile forces 53 and compressive forces 54 are transferred into the brackets 6 and into the ribs 23 connected to the pivot joint 7 by means of welds 31, which are in Fig. 2 and Fig. The process shown in Figure 3 is initiated. The tensile and compressive forces 42 and 41, resulting from the compressive force 5 and thus from the winding moment 51, are short-circuited via the brackets 6 without overloading the pivot point 7. This results in compressive 54 and tensile loads 53 in the bracket 6.

[0073] As this can be seen from the Fig. 2 and Fig. As can be seen from Figure 3, the rocker cylinder housing 21 has two half-shells that partially enclose the pivot piece 7 in a lower area and two longitudinal elements extending lengthwise along each side of the pivot piece 7. A rocker cylinder receptacle 2 is integrated into each of the longitudinal elements. The rear half-shell 24 is wider than the front half-shell. The rear bracket and the front bracket 6 are arranged at a certain distance from the pivot point 52 in order to minimize the compressive 54 and tensile loads 53 in the brackets 6 by means of a larger lever arm.

[0074] The front bracket 6 adjoins the front half-shell. The front bracket 6 has the same width as the front half-shell.

[0075] The front half-shell and the front bracket 6 completely enclose the pivot piece 7 in a cross-section.

[0076] The longitudinal elements extend further to the rear than the rear half-shell 24. The rear bracket 6 connects to the area of ​​each longitudinal element located behind the rear half-shell 24.

[0077] Due to the space requirements of the rocker cylinders 1, it is not possible for the rocker cylinder housing 2 and the rear bracket 6 to form a complete, enclosing cross-section in the rear area of ​​the rocker cylinder housing 21. The function of a structure enclosing the pivot point 7 in a cross-section is fulfilled by the rear half-shell 24 of the rocker cylinder housing 2 below the rocker cylinder receptacle 21, the rear bracket 6, and the sections of the two longitudinally extending longitudinal elements located between the rear half-shell 24 and the rear bracket 6.

[0078] The rear bracket 6 short-circuits the tensile load 42 in the side wall 4 and therefore experiences tensile forces 53. The front bracket 6 short-circuits the compressive loads 41 in the side wall 4 and therefore experiences compressive forces 54.

[0079] With regard to the linkage section, the terms "rear" and "front" are preferably used such that "rear" denotes the direction of the linkage, with which the linkage section can be attached to, for example, a crane, and "front" denotes the other direction. Similarly, "top" and "bottom" preferably refer to orientations that exist during the intended use of the telescopic boom, i.e., for example, when the telescopic boom is mounted on a crane and in transport position.

[0080] Without the two brackets 6, the pivot point 7 would experience a significantly higher load.

[0081] In Fig. Figure 3a is the expected deformation of a pivot bolt 7 from the prior art without a stirrup 6 due to the compressive load 41 and the tensile load 42, which is shown by arrows in the illustration, and is significantly exaggerated for illustrative purposes. Fig. 3a are symbolized, represented.

[0082] The force flow of the pressure force 5 in the rocker cylinder 1 was optimized and the load was distributed so that both the bracket 6 and the linkage 7 can absorb loads and short-circuit to the other side.

[0083] In the rear area of ​​the pivot point 7, the enclosure is formed by the large half-shell 24 of the rocker cylinder housing 2 below the rocker cylinder receptacle 21, respectively by the sections of the two longitudinally extending longitudinal elements that lie longitudinally between the rear half-shell 24 and the rear bracket 6, and by the rear bracket 6, as shown in Fig. 3 emerges.

[0084] The enclosure can thus be, for example, ring-shaped, running in one cross-section or over several cross-sections, whereby the enclosure partially runs in the longitudinal direction of the pivot shot 7.

[0085] Preferably, a cross-section denotes a cross-sectional plane. A cross-section is preferably a cross-section perpendicular to the longitudinal axis of the pivot point.

[0086] The brackets 6 are not connected to the pivot piece 7, in particular not by welds. A gap 61 exists across the entire width between the brackets 6 and the pivot piece 7, as can be seen from Fig. 5. This avoids the negative effects of welding distortion on the shape and dimensional stability of the pivot joint 7. Likewise, no notch or structural change is created in the Fig. 5 marked area 10 of the pivot shot 7, which is highly stressed by tensile stress.

[0087] It is conceivable that without a bracket enclosing the pivot point, the compressive forces 5 arising during the operation of the crane cannot be introduced with the respective position of the rocker cylinder mount 21, or only with significantly higher material usage and thus weight.

[0088] Out of Fig. Figure 16 shows the influence of the height offset 22 of the rocker cylinder mount 21 to the mounting of the rocker cylinder 1 on the pivot piece 7 on the loads of the pivot piece 7. Fig. 16 no bracket is arranged on the pivot point 7.

[0089] In Fig. Figure 16 shows the height 72 of the pivot shot 7 and its neutral 73 fiber during bending. Reference symbol list: 1000 crane 1010 undercarriage 1020 upper carriage 1021 Telescopic boom 1022 Turntable 1 rocker cylinder 2 rocker cylinder boxes 21 rocker cylinder mount 22 Height offset of the rocker cylinder mount 23 ribs for load introduction on the rocker cylinder box 24 half-shells 31 welds between linkage and rocker cylinder housing 4 Side wall of the pivot shot 41 Printing area on the side wall 42 Pull area on the side wall 5. Pressure force, which is generated in particular by the rocker cylinder 51. Folding moment acting on the side wall of the pivot shot 52 Vertical axis around which the rolling moment acts 53 Tensile force in the rear bracket 54 pressure force in the front bracket 6 hangers 61 Gap between bracket and pivot point 7. Linkage shot 71 Longitudinal axis of the pivot shot 72 Height of the pivot shot 73 Neutral fiber of the pivot shot (with respect to a bending load) 74° angle of force action of rocker cylinder to longitudinal axis pivot shot 8 Connection element of the TY tensioning 9 TY tensioning 91 Normal force from load due to TY bracing 92 Force flow in the connection element of the TY tensioning 10 Area subjected to high tensile stress

Claims

[1] Telescopic boom with a rocker element for rocking the telescopic boom, a pivot point and a support element, wherein the support element is arranged at least on the underside of the pivot point and has a receptacle designed for fastening the rocker element, characterized by that the telescopic boom has one or more, in particular two, bracket elements which are arranged at least on the top of the pivot section and are connected to the support element, so that the support element and the bracket element or bracket elements enclose the pivot section. [2] Telescopic boom according to claim 1, characterized by that the support element extends over at least part of the underside, at least part of the sides and / or at least part of the top of the pivot piece, and that the bracket element or one of the bracket elements extends over the part of the pivot piece over which the support element does not extend. [3] Telescopic boom according to claim 1 or 2, characterized by , that the support element extends in a cross-section over at least part of the underside, in the cross-section over at least part of the sides, and that one of the stirrup elements extends in the cross-section over the part of the pivot section over which the support element does not extend. [4] Telescopic boom according to claim 3, characterized by , that the support element extends in a further cross-section over at least a part of the underside and in each further cross-section and / or in each longitudinal direction of the pivot section over at least a part of the sides, and that another of the bracket elements connects to the sections of the support element, which in each further cross-section and / or in each longitudinal direction extend over at least a part of the sides, and extends over the part of the pivot section over which the support element does not extend. [5] Telescopic boom according to any one of the preceding claims, characterized by , that none of the bracket elements is directly connected to the linkage, in particular welded, and / or that none of the bracket elements is completely connected to the linkage, in particular welded, and / or that one or more gaps are present between the respective bracket element and the linkage. [6] Telescopic boom according to any one of the preceding claims, characterized by, that the support element has a further receptacle, in particular one identical in construction to the aforementioned receptacle, which is designed for the attachment of a rocker element, wherein the support element is further arranged at least partially on both sides of the pivot point and / or further at least partially on the top of the pivot point, wherein one of the receptacles is located on one side of the pivot point on the support element and the other receptacle is located on the other side of the pivot point on the support element. [7] Telescopic boom according to any one of the preceding claims, characterized by , that each ironing element is identical or different from each other and / or is of box construction and / or has an elongated section and two shorter sections angled from it. [8] Telescopic boom according to any one of the preceding claims, characterized bythat both ends, especially the shorter sections, of each stirrup element are connected to the supporting element, in particular welded. [9] Telescopic boom according to any one of the preceding claims, characterized by , that several ribs, especially triangular ones extending in the longitudinal direction of the pivot point, are connected, especially welded, to the support element at the rear and front, and are also connected, especially welded, to the pivot point. [10] Telescopic boom according to any one of the preceding claims, characterized by that the supporting element is of box construction and / or is fully or partially connected to the pivot point, in particular welded. [11] Telescopic boom according to any one of the preceding claims, characterized by that each inlet is located in an upper quarter, fifth or sixth of the pivot shot, preferably over a neutral fiber of the pivot shot. [12] Telescopic boom according to any one of the preceding claims, characterized by that the supporting element and each stirrup element are made of sheet steel and are constructed as welded structures. [13] Crane, in particular mobile crane with a telescopic boom according to one of the preceding claims.

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