Working implement, in particular telescopic boom for a crane or mobile crane

Abstract

A telescopic boom (1) for a working implement, in particular a crane or mobile crane, comprising: - at least three telescopic sections (3, 4, 5), wherein a first telescopic section (3) is arranged to surround a second telescopic section (4) over at least a predetermined range, and the second telescopic section (4) is arranged to surround a third telescopic section (5) over at least a predetermined range; - at least one drive device (6) for telescopically retracting and / or extending the second telescopic section (4) relative to the first telescopic section (3); - at least one synchronizing device (7) by which the third telescopic section (5) is telescopically extendable and retractable relative to the second telescopic section (4), in particular synchronously. In the telescopic boom (1), at least one synchronizing device (7) is arranged substantially completely inside the second telescopic section (4).

Description

Technical Field

[0001] The present invention relates to a telescopic boom for a working implement, in particular a crane or a mobile crane, having at least three telescopic sections, wherein a first telescopic section is arranged to surround a second telescopic section over at least a predetermined range, and the second telescopic section is arranged to surround a third telescopic section over at least a predetermined range, the at least three telescopic sections, at least one drive device for telescopically retracting and / or extending the second telescopic section relative to the first telescopic section, and at least one synchronizing device by which the third telescopic section is telescopically extendable and retractable relative to the second telescopic section, in particular synchronously. Furthermore, the present invention relates to a working implement, in particular a crane or a mobile crane, having at least one such telescopic boom. Furthermore, the present invention relates to a method for telescopically retracting or extending such a telescopic boom.

Background Art

[0002] Based on WO 2014 / 006474, telescopic booms with telescopically extendable telescopic sections are already known.

[0003] In the prior art, the disadvantages are that the weight of the hydraulic system for telescopic telescopic movement is too large and the maintenance of the hydraulic control unit is time-consuming. Furthermore, since the innermost telescopic section is generally provided for accommodating the extension part and / or the load receiving means, the adaptability of known hydraulic systems is limited. The allowable load is inconvenient for efficient use of the working tool in a hydraulic system - especially based on the center of gravity distribution and / or the dead weight in the telescopic section. In this case, arranging the hydraulic system inside the innermost telescopic section is out of the question from the viewpoints of space and technical feasibility.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] Therefore, the objective technical problem of the present invention is to improve the telescopic boom according to the prior art so that the disadvantages of the prior art are at least partially eliminated, and in particular, to provide a telescopic boom that is excellent in terms of efficient space utilization of the telescopic section and / or efficient weight distribution with a small number of component parts and / or less maintenance.

MEANS FOR SOLVING THE PROBLEM

[0005] This problem is solved by the features described in the characterizing part of claim 1.

[0006] Therefore, according to the present invention, it is defined that at least one synchronizing device is arranged substantially completely inside the second telescopic section.

[0007] Thereby, for the first time, it becomes possible to use the storage chamber inside the third telescopic section - generally the innermost telescopic section - for accommodating the synchronizing device. Therefore, a particularly compact telescopic boom can be provided.

[0008] At least one synchronization device is arranged substantially completely inside the second telescopic section, and is set in at least one predetermined operating position. Particularly preferably, such an arrangement exists both in the telescopically retracted operating position and in the telescopically extended operating position of the second telescopic section and / or the third telescopic section.

[0009] In addition to this, a positive characteristic is obtained that an additional reach addition can be obtained by an additional telescopic section - the third telescopic section - without relying on an additional external extension in the telescopic section while maintaining the hydraulic control unit of the telescopic section or the telescopic drive arm.

[0010] Particularly preferably, the synchronization device itself is not controlled (in a hydraulic, electric or similar manner), and can form a mechanical connection between the third telescopic section and the second telescopic section via the first telescopic section. Therefore, during the telescopic expansion and contraction movement of the second telescopic section from the first telescopic section, the telescopic expansion and contraction movement of the third telescopic section from the second telescopic section can be automatically obtained. In this case, the constant velocity chain or the sequential control unit is arranged at least partially outside the telescopic section - at least outside the second telescopic section.

[0011] Furthermore, the synchronization device can be formed such that the telescopic expansion and contraction movement of the third telescopic section can be disabled. By means of at least one synchronization device arranged completely inside the telescopic section, a particularly advantageous center of gravity distribution can be achieved. In this case, this at least one synchronization device is protected against contamination and / or weather. The mechanical synchronization device is much lighter compared to the hydraulic system and / or the electric control unit. In this case, the moment of inertia in the telescopic boom increases minimally based on the internal arrangement form, particularly based on the internal arrangement form in the second last telescopic section - the second telescopic section.

[0012] Furthermore, the added reach produced by this at least one synchronizing device can be flexibly incorporated or retrofitted in a large number of different telescopic booms and / or work implements, such as cranes, lifting devices or the like. The defined increase in reach enables convenience functions, such as overload monitoring and / or reach measurement, to be equipped accordingly in this at least one synchronizing device.

[0013] The first telescopic section may be telescopically extendable per se, but this is generally not necessarily the case. In the telescopically retracted operating position of the telescopic boom, the first telescopic section surrounds the two separate telescopic sections over at least a predetermined range, in which case the third telescopic section is arranged inside the plane formed by the side surface of the second telescopic section. A telescopic section can be considered synonymous with a telescopic boom or a telescopic extensible boom.

[0014] The telescopic section can preferably be used synonymously with "telescopic boom" in this specification. Preferably, at least one synchronizing device mediates the synchronous movement of the innermost telescopic boom or the third telescopic boom. In this case, generally, for example, by means of a speed-changing means, an asynchronous movement can be caused via this at least one synchronizing device.

[0015] As described at the beginning, protection is also required for a work implement, in particular a crane or a mobile crane, having at least one such telescopic boom, in particular provided with at least one further telescopic section, which further telescopic section is arranged to surround at least three telescopic sections over at least a predetermined range.

[0016] This enables a working implement that has additional - especially not located on the outside and / or hydraulically controlled - telescopic stages, or, with the number of telescopic stages remaining the same, efficiently utilizes the last telescopic stage for telescopic extension and retraction together with the second - last telescopic stage.

[0017] As described at the beginning, in a method of telescopically retracting or extending such a telescopic boom, the following method steps, especially to be carried out in parallel: a method step of translationally moving a second telescopic stage relative to a first telescopic stage, especially via a hydraulic drive device, and a method step of translationally moving a third telescopic stage, preferably synchronously, relative to the second telescopic stage by means of the movement of the second telescopic stage via at least one synchronizing device, are also required to be protected.

[0018] Advantageous embodiments of the invention are described in each of the dependent claims.

[0019] In an advantageous embodiment of the invention, it is defined that the first telescopic stage is formed to be telescopically extendable or non - telescopically extendable relative to at least one other telescopic stage via at least one other drive device.

[0020] The number of telescopic stages of a telescopic boom is generally arbitrary. Thus, the first telescopic stage can be a telescopic stage closest to the crane base that is itself non - telescopically extendable, or can itself be formed to be telescopically extendable relative to another telescopic stage. By the telescopic extension and retraction movement of the second telescopic stage relative to the first telescopic stage, the third - innermost - telescopic stage is automatically moved together via at least one, preferably mechanical, synchronizing device.

[0021] It is advantageous if at least one synchronizing device is arranged inside the third telescopic section over at least a predetermined range and inside a plane formed by at least four sides, preferably all sides, of the third telescopic section.

[0022] Preferably, at least one synchronizing device is arranged inside the second - second - last - telescopic section, preferably completely, during the process of a complete telescopic movement, and is moved so as to be at least partially retracted into the first telescopic section during the process of a telescopic retraction movement and / or is moved so as to be at least partially withdrawn from the third telescopic section during the process of a telescopic extension movement.

[0023] It has been found to be expedient if at least one synchronizing device is formed in the form of a chain, belt and / or cable. In this case, it is preferably specified that the chain, belt and / or cable is elastically deformable.

[0024] Particularly preferably, the synchronizing device is present in the form of a chain, which is arranged on the second telescopic section and / or the third telescopic section, preferably directly via attachment means.

[0025] In another embodiment of the invention, it is specified that at least one synchronizing device is formed as a rack with gears. In this case, preferably, the gears are arranged on the second telescopic section, preferably on the rear wall of the second telescopic section, are positioned inside the second telescopic section and project into the third telescopic section over at least a predetermined range, and / or it is specified that the rack is arranged inside the third telescopic section over at least a predetermined range, particularly preferably completely.

[0026] It has been found to be advantageous for at least one synchronizing device to include at least one deflector roller. In this case, the at least one synchronizing device is guided around the at least one deflector roller and / or is coupled to the synchronizing device itself, and in this case, preferably, at least two deflector rollers that are spatially separate from each other are provided.

[0027] The translational movement of the second telescopic section is transmitted to the third telescopic section via at least one synchronizing device by means of at least one deflector roller. In this case, the at least one deflector roller is preferably arranged inside the first telescopic section and / or the second telescopic section and / or the third telescopic section, - preferably inside the second telescopic section in all operating positions.

[0028] An advantageous variant is that the second telescopic section includes at least one mounting device, preferably a shaped body or a shaped tube, arranged indirectly or directly on the second telescopic section, preferably on the rear wall of the second telescopic section, and this mounting device projects into the third telescopic section over at least a predetermined range, and at least one deflector roller is arranged on this at least one mounting device.

[0029] By arranging at least one mounting device on the second telescopic section, a kinematic connection between the at least one synchronizing device and the second telescopic section can be produced. In this case, the third telescopic section is preferably moved together with the second telescopic section via a kinematic connection with at least one synchronizing device and / or is telescopically extended synchronously.

[0030] However, generally speaking, it is also conceivable to attach at least one mounting device to the third telescopic section. In this case, this at least one mounting device is moved so as to project from the second telescopic section over a predetermined range during the telescopic expansion and contraction movement.

[0031] Generally, the third telescopic stage telescopically extends and retracts together with the second telescopic stage by the same amount, and advances from the second telescopic stage by the same amount as the second telescopic stage is telescopically extended from the first telescopic stage (synchronous movement), and / or can advance from the second telescopic stage by an amount less than or greater than the amount by which the second telescopic stage is telescopically extended from the first telescopic stage. The same applies to the telescopic retraction process.

[0032] Particularly preferably, it is specified that one, preferably the turning roller closer to the front side of one, preferably the second telescopic stage, is pre-tensioned by at least one chain tensioner arranged on a preferably at least one, optionally existing mounting device.

[0033] Thereby, undesirable cable sag and / or inappropriately high chain tension can be reduced.

[0034] In one embodiment of the present invention, it is specified that at least one chain tensioner is formed in a threaded shape arranged on a translationally extensible mounting device, a plug-in connection part and / or a mounting device.

[0035] For example, the mounting device includes a thread, and by this thread, the mounting device can be telescopically extended and retracted to increase the chain tension. However, generally, a tensioning device separate from the mounting device or a tensioning device arranged on the mounting device may be provided, and such a tensioning device increases the tension of at least one synchronizing device, for example, by pressure. The "chain tensioner" can be interpreted broadly in this specification, and in this case, this term may also be applied to other forms of synchronizing devices such as belts or cables.

[0036] In another preferred embodiment of the present invention, it is defined that at least one synchronizing device is arranged on the third telescopic section at a first fixed point of position. In this case, preferably, it is defined that the first fixed point of position is formed as a pin connection, a magnetic connection, a screw connection and / or a material connection type connection between at least one synchronizing device and the third telescopic section.

[0037] The first fixed point of position can cause a kinematic connection with the third telescopic section during the movement of the second telescopic section. Optionally, the magnetic connection present can be switched to inoperative or operative via the rear side of the second telescopic section or remotely.

[0038] It has been found advantageous for the first fixed point of position to be arranged near the rear side of the third telescopic section and / or in the region of the deflection roller present, if any, in the telescopically retracted operating position of the third telescopic section.

[0039] This can facilitate the deactivation of the kinematic connection and / or direct maintenance work on at least one synchronizing device. However, it is also possible to arrange the first fixed point of position near the front side of the third telescopic section.

[0040] Furthermore, preferably, it is defined that at least one synchronizing device can be arranged or is arranged together with the first telescopic section at a second fixed point of position, preferably detachably, via at least one mounting means.

[0041] The second fixed point of position can cause a kinematic connection with the second telescopic section for moving the third telescopic section together - in particular via the mounting device.

[0042] In yet another embodiment, it may be defined that the second position fixing point is arranged near the front side of the third telescopic section and / or in the region of the deflecting roller that may be present in the telescopically retracted operating position of the third telescopic section.

[0043] Thereby, it is possible to facilitate the disabling of the kinematic connection and / or direct maintenance work in at least one synchronizing device. However, it is also possible to arrange the second position fixing point near the rear side of the second telescopic section.

[0044] In an advantageous embodiment of the invention, at least one mounting means of the second position fixing point - is formed in the form of at least one pin connection, which is manually, preferably from the front side of the third telescopic section, and / or mechanically, preferably hydraulically separable and / or connectable, and / or - is formed in the form of at least one magnetic connection, which is manually, preferably from the front side of the third telescopic section, or electromagnetically separable and / or operable is defined.

[0045] The pin connection - which can generally also be used for the first position fixing point - forms a structurally simple kinematic connection with at least one synchronizing device.

[0046] The magnetic connection - which can generally also be used for the first position fixing point - forms a simple connection with at least one synchronizing device that can be disabled, and such a connection can be used remotely, for example, when the position fixing point is in a hard-to-reach position.

[0047] Advantageously, both position fixing points are spaced apart from each other in the telescopically retracted operating position, preferably spatially by at least the longitudinal extent of one mounting device, and / or by spatially spacing both deflection rollers, such that a high telescopic stroke can be achieved - in particular without a free space for an optional telescopic section extension - substantially via the longitudinal extent of a third telescopic section.

[0048] In a further advantageous embodiment of the invention, the first telescopic section comprises at least one retaining element arranged preferably on the rear wall of the first telescopic section, which retaining element is defined as engaging with the second telescopic section and with the third telescopic section in the telescopically retracted operating position of at least the third telescopic section. In this case, at least one mounting means is arranged on at least one retaining element, and in this case it is preferably defined that at least one retaining element is formed in the shape of a deformed shaped body or a deformed shaped tube, particularly preferably in the shape of a U-shaped deformed shaped body.

[0049] The retaining element can effect a kinematic connection between the third telescopic section and the first telescopic section via at least one synchronizing device. In this case, preferably, the third telescopic section and the first telescopic section are connected to at least one synchronizing device via both position fixing points.

[0050] It is advantageous if at least one mounting device and / or at least one retaining element are formed such that at least one synchronizing device can be supported on at least one mounting device and / or can be supported on at least one retaining element when the at least one synchronizing device hangs down.

[0051] For example, at least one retaining element may form a chain trough for guiding at least one synchronizing device.

[0052] It has been found to be advantageous if at least one drive device and / or optionally at least one further drive device present is formed as a hydraulic cylinder unit, an electric drive unit and / or a Bowden cable drive unit. In this case, it is preferably specified that at least one drive unit is arranged outside the second telescopic stage.

[0053] Particularly preferably, at least one synchronizing device includes a transmission, and using this transmission, it is specified that the telescopic speed of the third telescopic stage can be decelerated and / or accelerated compared to the telescopic speed of the second telescopic stage.

[0054] Thereby, any telescopic speed of the third telescopic stage can be adjusted.

[0055] In yet another preferred embodiment of the present invention, in the telescopically retracted operating position of the third telescopic stage, a free space is provided for connecting at least one telescopic stage extension between the front side of the third telescopic stage and at least one synchronizing device.

[0056] Through this free space, for example, load receiving means or optionally a crane arm extension to be attached to the telescopic boom can be arranged.

[0057] In yet another example of the present invention, it is specified that at least one mounting means is provided for the kinematic connection between the second telescopic stage and the third telescopic stage. In this case, by means of at least one mounting means, the third telescopic stage is moved together with the second telescopic stage during the relative movement of the second telescopic stage with respect to the first telescopic stage.

[0058] In this way, the kinematic connection of the three telescopic sections of the telescopic boom can be achieved.

[0059] In yet another preferred embodiment of the present invention, it is provided that at least one synchronizing device has at least one, preferably driven, sprocket arranged thereon.

[0060] The sprocket enables at least one transmission for the asynchronous movement of the third telescopic section or the third telescopic boom to be particularly advantageously incorporated. Further, in a drive unit directly coupled to at least one sprocket - for example, an electric or hydraulic drive unit - an outer, particularly hydraulic drive unit arranged on the telescopic section can be dispensed with.

[0061] For example, a form - fitting connection to at least one synchronizing device can be made via at least one sprocket and / or an alternative or supplementary drive device for at least one synchronizing device can be provided. Such a drive device is preferably formed as an integrated drive device. Particularly preferably, a sensor device - for example, a rotary angle transmitter - for the post - processing of detection and / or measurement data can be coupled to at least one sprocket.

[0062] Preferably, the innermost / third telescopic section is telescopically extended and retracted relative to the second telescopic boom without an indirect kinematic connection between the outer / first telescopic boom and the second telescopic boom, using a drive device for the synchronizing device, which is directly on the shaft of the synchronizing device and / or the sprocket and / or is electric and / or is arranged inside the second telescopic boom. Thus, the relative movement of the innermost telescopic section is made possible without the need for an external drive device (such as a hydraulic drive device). The decoupling from the first telescopic section can be achieved, for example, by separating the position fixing points in relation to the first telescopic section.

[0063] The synchronizing device can preferably act as an intermediary for converting the rotational movement of the shaft into a translational movement of the third telescopic section via a drive device directly arranged on the shaft, particularly preferably on the shaft of at least one sprocket. In this case, no additional drive via the first telescopic section is required to telescopically extend the innermost telescopic section from the second telescopic section.

[0064] It is particularly preferred that the working implement has at least one attachment point separate from the first telescopic section, and at least one holding element is arranged at this attachment point.

[0065] Preferably, at least one synchronizing device is decoupled from the second telescopic section, preferably via at least one attachment means, and the second telescopic section is kinematically connected to the third telescopic section, preferably via at least one attachment means, so that the third telescopic section is defined to move together with the second telescopic section relative to the first telescopic section during the translational movement of the second telescopic section.

[0066] By disconnecting at least one synchronizing device, the relative telescopic movement between the second telescopic section and the third telescopic section is rendered inoperable, so that the second telescopic section and the third telescopic section can be telescopically extended and retracted together by the same amount relative to the first telescopic section.

[0067] The features of the claims regarding the device can also be used in the claims regarding the method, and vice versa. Further details and advantages of the present invention will be described in detail below with reference to the drawings based on the illustrated embodiments.

Brief Description of the Drawings

[0068]

Figure 1

Figure 2a

Figure 2b

Figure 3a

Figure 3b

Figure 4a

Figure 4b

Figure 5

Mode for Carrying Out the Invention

[0069] Figure 1 shows a telescopic boom 1 for a working implement in the form of a crane or mobile crane. This telescopic boom 1 includes three telescopic sections 3, 4, 5, where in this case the first telescopic section 3 is arranged to surround the second telescopic section 4, and the second telescopic section 4 is arranged to surround the third telescopic section 5. The telescopic boom 1 further includes at least one drive device 6 for telescopically retracting and / or extending the second telescopic section 4 relative to the first telescopic section 3, and at least one synchronizing device 7, by which the third telescopic section 5 can be telescopically extended and retracted synchronously relative to the second telescopic section 4.

[0070] Generally, the synchronizing device 7 may include a transmission 31. Using this transmission 31, the telescopic speed of the third telescopic section 5 can be decelerated or accelerated compared to the telescopic speed of the second telescopic section 4, so that the telescopic movement proceeds asynchronously even if the telescopic directions are the same. However, this is not necessarily required.

[0071] The first telescopic section 3 can be telescopically extended and retracted relative to another telescopic section 8 via another drive device 9, where in this case the first telescopic section 3 may form a telescopic section that cannot be telescopically extended and retracted (for example, if the working implement has only three telescopic sections).

[0072] In the telescopic boom 1, the synchronizing device 7 is arranged completely inside the second telescopic section 4.

[0073] In telescopic boom 1, in the retracted operating position 25 as shown in the figure, the synchronization device 7 is completely disposed inside the first telescopic section 3 and inside the third telescopic section 5 over a predetermined range when retracted in the telescopic manner shown in the figure. Generally, it is also conceivable that the synchronization device 7 is completely disposed inside the third telescopic section 5 in the retracted operating position 25 retracted in the telescopic manner. In the operating position partially extended in the telescopic manner, the synchronization device 7 is disposed inside the third telescopic section 5 over a predetermined range and is drawn out from the first telescopic section 3 over a predetermined range during the telescopic expansion and contraction movement. In the operating position fully extended in the telescopic manner, the synchronization device 7 may be completely disposed outside the first telescopic section 3 or the third telescopic section 5.

[0074] In telescopic boom 1, a plurality of other telescopic sections 8 are provided, and these telescopic sections 8 are arranged so as to surround the three telescopic sections 3, 4, 5 and are operable by a plurality of other drive devices 9.

[0075] The drive device 6 and the other drive devices 9 are formed as a hydraulic cylinder unit 29, and each or all of the drive devices 6, 9 may be formed as an electric drive unit or a Bowden cable drive unit. The drive unit 6 is disposed outside 30 of the second telescopic section 4.

[0076] The synchronization device 7 includes a chain 10. A large number of synchronization devices 7 may be included in the telescopic boom 1. Alternatively or additionally, the synchronization device 7 may be formed as a belt or a cable. By means of the chain links, the chain 10 is elastically deformable itself.

[0077] Based on FIGS. 2a to 4b, the process of telescopically extending the telescopic boom 1 will be described. In this case, the method of telescopically retracting or extending the telescopic boom can be described as follows: The second telescopic stage 4 is moved translationally relative to the first telescopic stage 3 via a hydraulic or electric drive device 6. In parallel with this, the third telescopic stage 5 is moved translationally and synchronously relative to the second telescopic stage 4 via a synchronizing device 7 by the movement of the second telescopic stage 4.

[0078] In some cases, the synchronizing device 7 can be disconnected from the second telescopic stage 4 via the mounting means 24, and the second telescopic stage 4 can be kinematically connected to the third telescopic stage 5 by the mounting means 24. So, during the translational movement of the second telescopic stage 4, the third telescopic stage 5 is moved together with the second telescopic stage 4 relative to the first telescopic stage 3.

[0079] As shown in FIG. 2a, the synchronizing device 7 includes two deflecting rollers 11. In this case, the chain 10 is guided so as to go around both deflecting rollers 11 and is coupled to the chain 10 itself. The two deflecting rollers 11 are spatially arranged separately from each other on the telescopic boom 1.

[0080] As can be seen from FIG. 2b, in the telescopically retracted operating position 25 of the third telescopic stage 5, a free space 32 remains between the front side 15 of the third telescopic stage 5 and the synchronizing device 7 for coupling a telescopic stage extension 33. The illustrated telescopic stage extension 33 exists in the form of load-bearing means. In this case, alternatively or additionally, a telescopic stage extension 33 of another type (for example, a bending arm system) can be coupled to the telescopic boom 1.

[0081] Mounting means 24 are provided for the kinematic connection of the second telescopic stage 4 and the third telescopic stage 5. In this case, by means of this mounting means 24, the third telescopic stage 5 is moved together with the second telescopic stage 4 during the relative movement of the second telescopic stage 4 with respect to the first telescopic stage 3.

[0082] The synchronizing device 7 is arranged at the third telescopic stage 5 at the first fixed point 20, where in this case the first fixed point 20 is formed as a pin joint 21. Alternatively or additionally, the first fixed point may be formed as a screw joint, a material connection type joint between the synchronizing device 7 and the third telescopic stage 5, or a magnetic joint.

[0083] The first fixed point 20 is arranged in the region of one of the two deflection rollers 11 near the rear side 22 of the third telescopic stage 5 in the telescopically retracted operating position 25 of the third telescopic stage 5.

[0084] The synchronizing device 7 is detachably arranged via the mounting means 24 together with the first telescopic stage 3 at the second fixed point 23, where in general a non-detachable connection is also possible.

[0085] The second fixed point 23 is arranged in the region of one of the two deflection rollers 11 near the front side 15 of the third telescopic stage 5 in the telescopically retracted operating position 25 of the third telescopic stage 5.

[0086] The synchronizing device 7 is connected to the first telescopic stage 3 via a holding element 27, to the second telescopic stage 4 via a mounting device 13, and to the third telescopic stage 5 via the first fixed point 20, respectively.

[0087] The attachment means 24 of the second position fixing point 23 is formed as a magnet coupling part 26. This magnet coupling part 26 is separable and operable manually - from the front side 15 of the third telescopic stage 5 or from the rear wall 12 of the second telescopic stage 4 - or electromagnetically. The attachment means 24 may generally be formed by a pin coupling part 21 or a screw coupling part. The pin coupling part 21 or the screw coupling part is separable and connectable manually from the front side 15 of the third telescopic stage 5 and mechanically - for example hydraulically. Generally, a material connection type of coupling of the second position fixing point 23 is also conceivable, in which case the deactivation of the simultaneous movement of the third telescopic stage 5 and the second telescopic stage 4 may be permanently set or may be carried out via a different type of - for example provided at the first position fixing point 20 - immobilization means.

[0088] Figure 3a shows the actuated position in which the second telescopic stage 4 is partially telescopically extended relative to the first telescopic stage, effected via the drive device 6 (not shown for the sake of clarity of the drawing - see Figure 2b). Thereby, automatically the third telescopic stage 5 is telescopically extended by the same amount (synchronously) relative to the second telescopic stage 4 via the synchronizing device 7 (because no gear change is set in this embodiment).

[0089] Figure 3b is different from Figure 3a in terms of the viewing angle of the telescopic boom. As can be seen from Figure 3b, the second telescopic stage 4 includes an attachment device 13 arranged on the second telescopic stage 4 - on the rear wall 12 of the second telescopic stage 4 - and this attachment device 13 is formed in the shape of a profiled tube 14. The profiled tube 14 enters into the third telescopic stage 5 and the first telescopic stage 3 over a predetermined region in this actuated position, in which case both deflection rollers 11 are arranged - for example welded laterally - on the attachment device 13.

[0090] The deflecting roller 11 closer to the front side 15 of the second telescopic section 4 is pre-tensioned by a chain tensioner 16 arranged on the mounting device 13. Generally, the chain tensioner 16 may be arranged on the telescopic boom 1 spatially separately from the mounting device 13.

[0091] The chain tensioner 16 exists as a thread arranged on the mounting device 13 in the form of a mounting device 13 that can be extended translationally. The chain 10 can alternatively or additionally be stretched via a plug-in connection.

[0092] In both the telescopically retracted position and the telescopically extended position of the telescopic boom 1, the synchronizing device 7 is completely arranged inside the plane formed by the entire side surface 10 of the third telescopic section 5.

[0093] Figure 4a shows the telescopic boom 1 in the fully extended operating position. The working implement on which the telescopic boom 1 is arranged may generally have a mounting point separate from the first telescopic section 3, and a holding element 27 is arranged at this mounting point. The telescopic boom 1 may generally have a mounting point for the mounting device 13 separate from the second telescopic section 4.

[0094] In this embodiment, the first telescopic section 3 includes a holding element 27 arranged on the rear wall 12 of the first telescopic section 3, and this holding element 27 protrudes into the second telescopic section 4 and into the third telescopic section 5 in the telescopically retracted operating position 25 of the third telescopic section 5. Mounting means 24 are arranged on the holding element 27, and in this case, the holding element 27 is formed in the shape of a U-shaped deformed body 28.

[0095] FIG. 4b shows a view of FIG. 4a seen from a different direction. The mounting device 13 and the holding element 27 are formed such that the synchronizing device 7 can be supported by the mounting device 13 based on gravity and can be supported by the holding element 27 based on gravity when the synchronizing device 7 hangs down. However, this is not necessary when sufficient tension is previously applied to the synchronizing device 7 via the chain tensioner 16.

[0096] In the embodiment of the telescopic boom 1 shown in FIG. 5, two sprockets 34 are provided instead of the deflecting roller 11. In this case, the two sprockets 34 are arranged on the synchronizing device 7. At least one of the sprockets 34 is driven (not shown for the sake of clarity of the drawing) in an electric or hydraulic manner via a drive unit arranged inside the second telescopic stage 4 (this is not generally necessary), whereby the hydraulic cylinder unit 29 arranged outside the telescopic boom 1 can be dispensed with or used additionally.

[0097] The synchronizing device 7, in combination with the sprocket 34, includes a transmission 31 with a pinion device. Using this transmission 31, the telescoping speed of the third telescopic stage 5 can be decelerated or accelerated compared to the telescoping speed of the second telescopic stage 4. Therefore, the telescopic movement is performed asynchronously even though the telescoping directions are the same.

[0098] In this telescopic boom 1, the first position fixing point 20 is formed as a separable magnetic coupling 26, and the second position fixing point 23 is formed as a pin coupling 21. In this case, generally, both position fixing points 20, 23 may be formed as a magnetic coupling 26.

[0099] Another structural feature related to the deflecting roller 11, such as the chain tensioner 16, can also be used in the embodiment using the sprocket 34. A combination of the deflecting roller 11 and the sprocket 34 is also possible.

[0100] Even without the first telescopic stage 3 or with the first telescopic stage 3 disconnected, relative movement of the third telescopic stage 5 is possible via the drive of the synchronization device 7.

Claims

1. A telescopic boom (1) for a working implement, in particular for a crane or mobile crane, comprising: - at least three telescopic sections (3, 4, 5), wherein a first telescopic section (3) is arranged to surround a second telescopic section (4) over at least a predetermined range, and said second telescopic section (4) is arranged to surround a third telescopic section (5) over at least a predetermined range; - at least one drive device (6) for telescopically retracting and / or extending the second telescopic section (4) relative to the first telescopic section (3); - at least one synchronizing device (7) by which the third telescopic section (5) is telescopically extendable and retractable relative to the second telescopic section (4), in particular synchronously; in a telescopic boom (1) comprising the above, characterized in that the at least one synchronizing device (7) is arranged substantially completely inside the second telescopic section (4).

2. The telescopic boom (1) according to claim 1, wherein the first telescopic section (3) is telescopically extendable and retractable or non-telescopically extendable and retractable relative to at least one further telescopic section (8) via at least one further drive device (9).

3. The telescopic boom (1) according to claim 1 or 2, wherein the at least one synchronizing device (7) is arranged inside the third telescopic section (5) over at least a predetermined range and completely inside a plane formed by at least four, preferably all, sides (17) of the third telescopic section (5).

4. The telescopic boom (1) according to any one of claims 1 to 3, wherein the at least one synchronizing device (7) is formed in the form of a chain (10), a belt and / or a cable, and preferably it is defined that the chain (10), the belt and / or the cable is elastically deformable.

5. The at least one synchronizing device (7) includes at least one deflecting roller (11), the at least one synchronizing device (7) being guided around the at least one deflecting roller (11) and / or being coupled to the synchronizing device (7) itself, preferably at least two deflecting rollers (11) being provided which are spatially separate from each other, the telescopic boom (1) according to any one of claims 1 to 4.

6. The second telescopic section (4) includes at least one mounting device (13), preferably a profiled body or profiled tube (14), arranged indirectly or directly on the second telescopic section (4), preferably on the rear wall (12) of the second telescopic section (4), the mounting device (13) protruding into the third telescopic section (5) over at least a predetermined range, and the at least one deflecting roller (11) being arranged on the at least one mounting device (13), the telescopic boom (1) according to claim 5.

7. One, preferably the deflecting roller (11) closer to the front side (15) of the second telescopic section (4), is pre-tensioned by at least one chain tensioner (16) arranged on at least one, possibly existing, mounting device (13), the telescopic boom (1) according to claim 5 or 6.

8. The at least one chain tensioner (16) is formed in the form of a mounting device (13) which can be extended translationally, a plug-in connection and / or a thread formed on the mounting device (13), the telescopic boom (1) according to claim 7.

9. The at least one synchronizing device (7) is arranged on the third telescopic section (5) at a first fixing point (20), preferably the first fixing point (20) being formed as a pin connection (21), a magnetic connection (26), a screw connection and / or a material connection type connection between the at least one synchronizing device (7) and the third telescopic section (5), the telescopic boom (1) according to any one of claims 1 to 8.

10. The telescopic boom (1) according to claim 9, wherein the first position fixing point (20) is arranged near the rear side (22) of the third telescopic section (5) in the retracted operating position (25) of the third telescopic section (5) in a telescopic manner, and / or in the region of the deflection roller (11) which may be present in some cases.

11. The telescopic boom (1) according to any one of claims 1 to 10, wherein the at least one synchronizing device (7) can be arranged or is arranged together with the first telescopic section (3) at a second position fixing point (23), preferably detachably, via at least one mounting means (24).

12. The telescopic boom (1) according to claim 11, wherein the second position fixing point (23) is arranged near the front side (15) of the third telescopic section (5) in the retracted operating position (25) of the third telescopic section (5) in a telescopic manner, and / or in the region of the deflection roller (11) which may be present in some cases.

13. The at least one mounting means (24) of the second position fixing point (23) is - formed in the form of at least one pin connection (21), which pin connection (21) is manually, preferably from the front side (15) of the third telescopic section (5), and / or mechanically, preferably hydraulically, separable and / or connectable, and / or - formed in the form of at least one magnetic connection (26), which magnetic connection (26) is manually, preferably from the front side (15) of the third telescopic section (5), or electromagnetically separable and / or operable. The telescopic boom (1) according to claim 11 or 12.

14. The first telescopic section (3) includes at least one holding element (27) arranged on the first telescopic section (3), preferably on the rear wall (12) of the first telescopic section (3), the holding element (27) penetrating into the second telescopic section (4) and the third telescopic section (5) in a telescopically retracted operating position (25) of at least the third telescopic section (5), at least one mounting means (24) being arranged on the at least one holding element (27), and it is defined that preferably the at least one holding element (27) is formed in the shape of a deformed body or a deformed tube, particularly preferably a U-shaped deformed body (28). The telescopic boom (1) according to any one of claims 11 to 13.

15. The at least one mounting device (13) and / or the at least one holding element (27) are formed such that the at least one synchronizing device (7) can be supported on the at least one mounting device (13) and / or can be supported on the at least one holding element (27) when the at least one synchronizing device (7) hangs down. The telescopic boom (1) according to any one of claims 6 to 13 and / or claim 14.

16. The at least one drive device (6) and / or, optionally, at least one further drive device (9) present are formed as a hydraulic cylinder unit (29), an electric drive unit and / or a Bowden cable drive unit, and it is defined that preferably the at least one drive unit (6) is arranged on the outside (30) of the second telescopic section (4). The telescopic boom (1) according to any one of claims 1 to 15.

17. The at least one synchronizing device (7) includes a transmission (31), and by using the transmission (31), the telescopic speed of the third telescopic section (5) can be decelerated and / or accelerated compared to the telescopic speed of the second telescopic section (4). The telescopic boom (1) according to any one of claims 1 to 16.

18. In the retracted operating position (25) of the telescopic third telescopic section (5), there remains a free space (32) for connecting at least one telescopic section extension (33) between the front side (15) of the third telescopic section (5) and the at least one synchronizing device (7). The telescopic boom (1) according to any one of claims 1 to 17.

19. At least one mounting means (24) is provided for the kinematic connection between the second telescopic section (4) and the third telescopic section (5), and by means of the at least one mounting means (24), the third telescopic section (5) is moved together with the second telescopic section (4) during the relative movement of the second telescopic section (4) with respect to the first telescopic section (3). The telescopic boom (1) according to any one of claims 1 to 18.

20. At least one, preferably driven, sprocket (34) is arranged on the at least one synchronizing device (7). The telescopic boom (1) according to any one of claims 1 to 19.

21. A working implement, in particular a crane or a mobile crane, comprising at least one telescopic boom (1) according to any one of claims 1 to 20, in particular having at least one further telescopic section (8) arranged so as to surround the at least three telescopic sections (3, 4, 5) over at least a predetermined range.

22. The working implement according to claim 21, wherein the working implement has at least one mounting point separate from the first telescopic section (3), and at least one holding element (27) is arranged at the mounting point.

23. In a method of telescopically retracting or extending the telescopic boom (1) according to any one of claims 1 to 20, the following method steps, in particular to be carried out in parallel: - A method step of moving the second telescopic section (4) translationally relative to the first telescopic section (3), in particular via the drive device (6) which is preferably hydraulic. - A method step of moving the third telescopic section (5) translationally, preferably synchronously, with respect to the second telescopic section (4) by the movement of the second telescopic section (4) via the at least one synchronizing device (7); A method for telescopically retracting or extending a telescopic boom (1). **Claim 24** The method according to claim 23, wherein the at least one synchronizing device (7) is disconnected from the second telescopic section (4), preferably via at least one mounting means (24), and the second telescopic section (4) is kinematically connected to the third telescopic section (5), preferably by at least one mounting means (24), such that the third telescopic section (5) moves together with the second telescopic section (4) relative to the first telescopic section (3) during translational movement of the second telescopic section (4).

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