Mobile crane with foldable boom arrester device and foldable boom for the crane

Abstract

To enhance safety during assembling and disassembling a mobile crane.SOLUTION: A mobile crane includes an undercarriage having a chassis and an upper structure having a telescopic boom that is rotatable around a vertical axis with respect to the undercarriage and has a boom head arranged on a tip. The boom has holding means for holding a folding boom that is releasably installed on a boom head. The boom includes a console and a holding element arranged between the console and the boom head on its side part. The folding boom is supported by the console and rotatable around a vertical axis of the holding element so as to be mounted on the boom head. A first fixing device for restricting movement deviating from the movement of the folding boom rotating around the vertical axis is arranged in an area of the console. The present invention is further related to the folding boom for a crane.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a mobile crane according to the preamble of claim 1 and to a folding boom for such a crane. [Background technology]

[0002] Mobile cranes are generally suitable for driving on public roads. In this sector, special regulations apply regarding the permissible weight and maximum permissible dimensions (especially height and width) of mobile cranes. Approvals can vary depending on these dimensions. The effort required to apply for and obtain exemptions also varies depending on the dimensions.

[0003] Mobile cranes generally have a telescoping boom in addition to a chassis and a rotatably supported superstructure. It is common practice for some mobile cranes to have a fly boom, also known as a folding boom, attached to a boom head or pulley head located at the end of the boom. Especially for smaller mobile cranes, the folding boom is often supported on the sides of the boom when traveling on public roads. This makes the availability of mobile cranes highly variable. For this purpose, it is known to support a folding jib laterally on the boom by multiple support means, and to provide a laterally protruding console on which the folding boom can be supported during storage and / or during the installation process.

[0004] A key feature of mobile cranes that are carried by a boom with a folding boom is that the folding boom can be moved from its transport position to its working position where it is attached to the boom head, and vice versa (also known as assembling or disassembling the crane). Such mobile cranes, which can be transported to their location as a fully autonomous unit and assembled there, are also known as taxi cranes.

[0005] Assembling a folding boom into its working position requires various movements, both linear and about one or more generally vertical pivot axes. However, as a rule, the crane's actuators for these movements are only available to a limited extent. In this regard, the drive devices can be either existing devices, such as telescopic cylinders, or specially installed devices, such as manually operated hydraulic presses. Summary of the Invention [Problem to be solved by the invention]

[0006] During the assembly process, the folding boom must be partially rotated if the connection to the telescopic boom is not securely or completely established due to operational error. For example, the folding boom, which is supported on the console via rolls / rollers, moves along the console during the rotational movement of this process. If an operational error occurs, the support for the folding boom may move to the edge of the console, causing further unwanted movement due to the weight of the folding boom, ultimately causing the folding boom to slip off the console. In the worst case scenario, the folding boom may fall off completely.

[0007] Against this background, the underlying object of the present invention is to further develop mobile cranes to increase safety during assembly and disassembly. [Means for solving the problem]

[0008] This object is achieved by a crane having the features of claim 1 of the present invention. The mobile crane of the present invention comprises a chassis having a base and a superstructure having a telescopic boom swivelable about a vertical axis relative to the chassis and with a boom head disposed at its tip. The boom has a holding means on one side for supporting a folding boom that is removably attached to the boom head. The boom has a console and a holding element disposed on the side between the console and the boom head. The folding boom is swivelable about the vertical axis of the holding element for installation at the boom head while supported by the console.

[0009] During assembly or disassembly, the force generated by the weight of the folding boom is dispersed by being supported by the console, thereby reducing the force acting on the holding element. The chassis can be a crawler chassis or a wheel chassis.

[0010] According to the invention, a first fixing device is arranged in the area of ​​the console, which limits the movement of the folding boom from deviating from the movement of pivoting about a vertical axis.

[0011] In this specification, the term "vertical axis of the holding element" means that the connection between the folding boom and the boom formed by the holding element allows for a pivoting movement of the folding boom about a vertical axis. Movements of the folding boom that deviate from a pivoting movement about a vertical axis are movements that not only occur in a substantially horizontal plane, but also have a vertical movement component. This can occur, in particular, when the folding boom falls or falls off during an improper assembly process due to the weight of the folding boom.

[0012] In this regard, it is assumed in this application that the folding boom assembly process is performed on a horizontally oriented boom, so that the pivot axis about which the folding boom pivots is vertical. However, the present invention also covers assembling / disassembling the folding boom on an inclined boom, i.e., a boom that is not completely horizontal. In this case, the terms "vertical axis" and "horizontal plane" should be understood to mean that the folding boom pivots in a plane perpendicular to the pivot axis, which is oriented perpendicular to the longitudinal axis of the boom and lies in a plane parallel to the plane intersecting the longitudinal axis and the vertical direction.

[0013] The first securing device prevents the folding boom from slipping off the console in the event of an incorrect operation, thereby increasing the safety of the assembly and disassembly process. Therefore, the protection of the present application also extends to the case where the safety system according to the present invention, in which the folding boom is swung around the vertical axis of the holding element to connect the fastening means of the folding boom and the boom head together, forgets to connect or pin the connected fastening means, resulting in the disconnection of the folding boom from the holding means. In this case, the folding boom is no longer held by the connection of the fastening means at the boom head, and the folding boom may slip off the console and fall when further holding or securing devices are used. In such cases, the additional securing device in the area of ​​the console effectively prevents the folding boom from tipping over.

[0014] Advantageous embodiments of the invention emerge from the dependent claims and from the following description.

[0015] In one embodiment, a second fixing device capable of restricting vertical or falling movement of the folding boom is disposed on the side of the boom between the first fixing device and the boom head. The combination of the first fixing device and the second fixing device reliably prevents the folding boom from falling even in the event of a major operational error.

[0016] In yet another embodiment, the second securing device includes a securing arm extending from the boom, configured to prevent contact with the folding boom when the boom is in a transport position supported by the boom and when the boom is pivoting about a vertical axis. In the transport position, the securing arm can be positioned below the folding boom or can extend between the corner bar of the folding boom and the connecting strut to prevent contact with the folding boom. When the folding boom collapses, the folding boom falls onto the securing arm, thereby stopping the falling motion. Furthermore, the securing arm has a nose extending upward at the end away from the boom that prevents the folding boom from sliding sideways. Therefore, the nose can prevent horizontal movement of the folding boom.

[0017] Although the secondary locking device alone certainly reduces the risk of the folding boom tipping over in the event of an incorrect operation, it does not address all possible scenarios of incorrect movement of the folding boom during the assembly and disassembly process. Thus, for example, in the aforementioned scenario where the connection of the combined locking means is forgotten and the connection at the holding element is released, there is a risk that the folding boom will slip off the secondary locking device and the console, despite the capturing effect of the secondary locking device. This can only be effectively prevented by the first locking device according to the invention, which is arranged in the rear region of the boom.

[0018] Yet another embodiment provides that the first fixation device is located on the console, and thus is connected to the console or to part of the console.

[0019] In yet another embodiment, the console has a foldable structure and includes at least two console sections that are pivotally connected to and releasably latchable with each other, and the console can be unfolded from a transport position to an assembly position for assembling the folding boom with the boom head, and vice versa for disassembly. Because the lever relationship causes the folding boom to cover a relatively long distance on the console as it pivots about the retaining member, the console must be configured to be relatively long during assembly. The foldable structure of the console allows for space-saving operation of the crane and allows for support of the folding boom, since the folding boom is supported only by a portion of the console closest to the boom in the transport position. The console can be configured with two, three, or more sections that are pivotally connected to and releasably latchable with each other.

[0020] In yet another embodiment, the console is configured such that the folding boom is supported in a transport position on the boom, preferably via at least one roller of a first console part fixedly connected to the boom, and such that the folding boom rolls down over the at least one roller along the upper side of the console during a pivoting movement about the vertical axis of the holding element, causing the console to unfold into an assembly position.

[0021] In yet another embodiment, the first securing device is located on a pivotable portion of the console that forms the end piece of the console in the assembled position and is configured so that the folding boom does not contact the first securing device when in the boom-supported transport position and when pivoting about a vertical axis. Thus, the folding boom does not contact the first securing device when a proper assembly process is performed in which the folding boom performs a pivoting movement about a vertical axis, i.e., movement in a substantially horizontal plane. In the case of an additional vertical movement element, contact with the first securing device that prevents the folding boom from falling occurs only when the folding boom is about to slide off the console.

[0022] The upper side of the console facing the folding boom preferably has a downwardly chamfered shape in the area of ​​the first fixing device. This is necessary, for example, because the outer part of the console must be swivelable, while the folding boom is supported in its transport position on the inner or first part of the console, which is not particularly movable. If the folding boom is not held in a purely swivel path around the vertical axis by appropriate fixing, the support, e.g., a roller / roll, could move up this inclined part, causing the folding boom to accelerate and slide down. The first fixing device can advantageously be installed in such a way that the folding boom is allowed to roll down along this chamfered surface, i.e., contact of the first fixing device by the folding boom occurs specifically and only in this case.

[0023] In yet another embodiment, the first fixing device comprises an arrester (restraint) element, particularly a rod- or bar-shaped element, configured such that an arrester hook on the folding boom engages with the arrester element to prevent further movement of the folding boom during a movement other than a pivoting movement about the vertical axis or a sliding movement of the folding boom from the console. The arrester hook is preferably configured so that it does not become disconnected from the arrester element. Furthermore, the arrester hook is positioned so that contact with the arrester element does not occur during the appropriate setting process. The arrester hook can be fixed to the folding boom, particularly to the corner bars or connecting struts, by welding or in another way, for example, by screws, clamps, etc.

[0024] In yet another embodiment, the arrester elements protrude from the console on both sides, and two arrester hooks on the folding boom are arranged to engage with the arrester elements on both sides of the console when the folding boom slides away from the console. This symmetrical solution is more stable and allows the tilted position of the folding boom to be corrected as needed when sliding away from the console, so that at least one of the two arrester hooks will always engage with a corresponding arrester element. The arrester elements may be formed in one piece, for example as a single bar-shaped element protruding from both sides of the console, or in multiple pieces, for example as two separate rod-shaped elements attached to either side of the console.

[0025] In another embodiment, the first fixing device has at least one arrester element, which is configured such that during a movement other than a pivoting movement about the vertical axis or during a sliding movement of the folding boom from the console, a particularly rod-shaped arrester element arranged on the folding boom engages with an arrester hook to prevent further movement of the folding boom, where multiple arrester hooks can also be provided, for example arranged symmetrically with respect to the console.

[0026] In yet another embodiment, the arrestor elements are formed by the corner bars or connecting struts of the folding boom, which eliminates the need for additional components on the folding boom, thereby reducing cost and weight.

[0027] It is also conceivable to combine the two aforementioned embodiments so that the first fixing device cooperates with a corresponding arrester hook and a corresponding arrester element on the folding boom, or has both an arrester element and an arrester hook that engage when the folding boom slides off the console.

[0028] In yet another embodiment, the boom head has fastening means for connecting with corresponding fastening means of the folding boom, and at least one fastening means of the folding boom can be coupled together by the fastening means of the boom head by pivoting the folding boom around the vertical axis of the holding element, and the folding boom can preferably be pivoted around the vertical axis of the fastening means coupled together after connecting and disconnecting the fastening means from the holding element, thereby coupling the remaining fastening means together. The fastening means can be pinning points or fork elements reversibly connectable to each other by pins, where the pin connections each form a vertical axis about which the folding boom can pivot.

[0029] The invention further relates to a folding boom for a crane according to the invention. In this respect, the same advantages and characteristics are clearly obtained for the crane according to the invention, so that a repetition will not be given at this point. The above description of possible embodiments of the folding boom for the crane according to the invention therefore also applies accordingly to the folding boom.

[0030] The folding boom according to the present invention in particular has at least one roller / roll via which it rests on the console and rolls down on the console as described above during the pivoting of the holding element about the vertical axis. The folding boom further preferably has an arrester hook or element as described above, which engages with a corresponding arrester element or hook in the area of ​​the console during a sliding movement of the folding boom from the console different from the pivoting movement about the vertical axis so that further movement of the folding boom is prevented. The folding boom may further have multiple mutually tiltable or pivotable sections so that the front of the installed folding boom can be tilted, for example by means of an adjustment cylinder.

[0031] The present invention further relates to a crane according to the invention, which incorporates the aforementioned folding boom according to the invention. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a side view of one embodiment of a crane according to the present invention with a folding boom in a transport position. [Figure 2] FIG. 2 is a plan view of the boom and folding boom of the crane according to FIG. [Figure 3] FIG. 3 is a diagram showing a schematic diagram of FIG. [Figure 4] FIG. 4 is a schematic cross-section perpendicular to the longitudinal axis through the folding boom and the boom in the region of the second fixing device. [Figure 5] FIG. 5 is a schematic cross-section perpendicular to the longitudinal axis through the folding boom and the boom in the region of the first fixing device. [Figure 6] FIG. 6 is a perspective view of the details of the folding boom supported by the boom, looking towards the console in the transport position. [Figure 7] FIG. 7 is a view of the console of FIG. 6 as seen from below. [Figure 8] FIG. 8 is a perspective view showing details of the folding boom rolling down onto the deployed console. [Figure 9] FIG. 9 is a perspective view showing details of the arrestor hook engaging the periphery of the arrestor element after sliding of the folding boom off the console. [Figure 10] FIG. 10 is a diagram showing an arrester hook according to another embodiment provided in the state of FIG. [Figure 11] FIG. 11 is a perspective view showing details of the arrester hook and arrester element after sliding from the console of the folding boom according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0033] Further features, details and advantages of the present invention will be explained below by means of embodiments shown in the drawings.

[0034] A side view of one embodiment of a mobile crane 10 according to the present invention is shown in Figure 1. The crane 10 comprises a chassis 12 having a four-axle wheeled chassis, a superstructure 14 rotatably supported on the chassis 12 about a vertical axis, and a telescoping boom 16 pivotally disposed on the superstructure 14 about a horizontal axis. At the end of the boom 16 is a roller head or boom head 18 having a plurality of fastening means 50 formed as pinning points and capable of attaching a folding boom 20 to the boom as needed. Figures 2 and 3 are both plan views of the boom 16 and folding boom 20 (Figure 3 is a schematic view).

[0035] This embodiment is a so-called taxi crane 10, since the folding boom 20 can be transported together with the crane 10 to the installation site and can be assembled and disassembled on-site without further external assistance. For this purpose, the folding boom 20 can be supported and laterally fixed on the boom 16 in its transport position (as shown in FIG. 1 ). The boom 16 has a row of retaining means laterally for this purpose. For assembly on the boom head 18, the folding boom 20 likewise has a plurality of fastening means 60 formed as pinning points. In this respect, the folding boom 20 is supported in its transport position so that its wide end with the fastening means 60 is located next to the boom head 18.

[0036] The boom 16 has retaining elements 24 on its sides, by means of which the folding boom 20 is supported on the boom 16 for pivoting movement about a vertical axis, the folding boom 20 being secured against unwanted pivoting in the transport position by additional retaining means not shown in further detail here. Furthermore, behind the boom 16 (in the direction of support on the superstructure 14), there is arranged on the side a console 22 on which the folding boom 20 is supported via a number of rolls or rollers 26. In the region of the retaining elements 24, at its end spaced from the boom 16, there is provided a fixing arm 34 having an upwardly protruding nose 36, the fixing arm 34 being arranged and configured so as not to come into contact with the folding boom 20 in the transport position and during proper assembly and disassembly.

[0037] 4 and 5 are schematic cross-sectional views of the folding boom 20 and the boom 16, taken perpendicular to the longitudinal axis of the folding boom 20 or the boom 16, respectively, at the fixed arm 34 (FIG. 4) and the console 22 (FIG. 5). The boom 16 is shown only diagrammatically. As can be seen from FIG. 4, the fixed arm 34 is positioned at a level where it protrudes downward through the upper corner bar of the folding boom 20 and protrudes upward through the lower corner bar. This prevents contact during lateral rotation of the folding boom. The fixed arm 34 functions as an arrestor device to prevent the folding boom 20 from falling due to operational error. If the folding boom 20 falls from the boom 16, the fall is arrested by the fixed arm 34, and the nose 35 prevents the folding boom 20 from sliding sideways off the fixed arm 34.

[0038] When assembling the folding boom 20, first, a pivoting movement (e.g., by a hydraulic cylinder) is performed about the vertical axis formed by the retaining element 34 to couple the fastening means 50, 60 of the boom head 18 and the folding boom 20 in a horizontal trajectory of movement and protect them from each other. From this point on, the folding boom 20 is firmly fixed to the boom 16, and they are then pinned so that the folding boom 20 can no longer fall off. The connection at the retaining element 24 can then be released. In a next step, a horizontal pivoting movement of the folding boom 20 is performed about the vertical axis formed by the pinned connection of the fastening means 50, 60 until the longitudinal axes of the folding boom 20 and the boom 16 are aligned and positioned in the same or parallel planes, and the remaining fastening means 50, 60 are coupled. Finally, the remaining fastening means 50, 60 are similarly pinned. When dismantling, the above steps are performed in reverse order.

[0039] During the pivoting movement of the folding boom 20 around the retaining element 24, the outer end of the folding boom 20 (the left end in FIG. 2 ) separates from the boom 16. The outer end of the folding boom 20 is guided on the console 22 during this process. The rollers 26 are provided to reduce the force. The area required to support the folding boom 20 during its pivoting movement is relatively long due to the lever ratio. For this reason, the console 22 is foldable and has three console sections 22′, 22″, 22′″ that are pivotally connected to each other and can be hooked together.

[0040] In the transport position of the folding boom 20, the console 22 folds inward in the transport position to reduce the space required for the boom 16. Here, the folding boom 20 is supported by a first console section 22' that is fixed directly to the boom 16. When the folding boom 20 is assembled, in contrast, the console 22 is unfolded so that the console sections 22', 22'', and 22''' are linearly aligned and latched together, thereby allowing the folding boom 20 to roll off rollers 26 on the surface of the unfolded console 22 during a lateral swing. The console 22 is shown diagrammatically in its unfolded (assembled) state in FIG. 3.

[0041] Although the fixed arm 34 already provides some protection against the folding boom 20 tipping over as a result of improper operation, it does not necessarily provide sufficient protection against particularly serious operating errors. A situation in which the coupled fastening means 50, 60 are forgotten to be pinned after a pivoting movement around the holding means 24 and subsequently released from the holding means 24 can result, for example, in the folding boom 20 falling onto the fixed arm 34 and sliding off the console 22. During such an operation, the folding boom 20 is in an inclined position due to its own weight and the two support points 22, 24, which can cause the folding boom 20 to slide over the nose 36 and subsequently fall.

[0042] In order to cover the situation where the folding boom 20 also slides backwards and to guarantee a safe installation process even in the event of serious operating errors, a further arrestor or locking device 30 according to the invention is provided in the area of ​​the console 22. The device according to the invention, arranged in the rear area of ​​the boom 16, will be referred to below as the first locking device 30, and the secure arm 34, together with the nose 36 arranged in the front area of ​​the boom 16, will be referred to as the second locking device 32.

[0043] 6-9 show a first embodiment of the first fixing device 30 according to the present invention in more detail. Here, the console 22 is shown in FIGS. 6 and 7 in a folded-inward or transport position in which the two pivotable console sections 22'', 22''' contact the first console section 22'. The folding boom 20 is located on the boom 16 in the transport position and is supported by the first console section 22' via rollers 26. The outermost console section 22''' is tapered or chamfered downward toward its end. This is due, inter alia, to the fact that the outer console sections 22'', 22''' must be able to pivot freely while the rollers 26 of the folding boom 20 are supported by the first console section 22'. The tapered area of ​​the console is actually due to the disassembly process. During disassembly, the operator pivots the folding boom toward the boom 16. Here, the folding boom is merely held by two pins around the pivot axis. The large overhang creates a large lever arm that tends to pull the folding boom downwards, so the folding boom needs to be supported via rollers 26 at the end of its swinging motion and thereby raised in its transport position.

[0044] 8 shows the outermost console section 22'" in its unfolded state, i.e., when the console 22 is in its assembled position. When the folding boom 20 is swung outward, the rollers 26 roll down on the unfolded console 22. In a proper assembly process, the folding boom 20 moves in a horizontal plane with a pivoting movement about a vertical axis (of the holding element 24 or of the pinning of the fastening means 50, 60). In the event of a mishandling that causes the folding boom 20 to slide downwards, i.e., a mishandling that causes the movement of the folding boom 20 to have a vertical component, the first fixing device 30 thus stops or blocks this unwanted movement.

[0045] For this purpose, the folding boom 20 is provided with an arrester element in the form of a hook or arrester hook 42, which is welded to the corner bar of the folding boom 20 in the embodiment shown in Figures 6 to 9, and in contrast, is clamped to the corner bar by a clamp 44 in the embodiment shown in Figure 10. When the rollers 26 of the folding boom 20 leave the console 22, the folding boom 20 rolls down the inclined surface of the outermost console section 22''' as seen in Figure 8 and accelerates due to gravity. After leaving the console 22, the supporting effect is completely lost. However, the previous movement of the folding boom 20 is maintained, resulting in a combined movement of vertical and horizontal components. Therefore, the positions of the arrester hook 42 and the arrester element 40 are appropriately selected, so that the arrester hook 42 of the folding boom 20 that has just fallen engages around the arrester element 40, thereby "intercepting" the folding boom 20 (see Figures 9 and 10). However, during a proper assembly or disassembly process, the arrestor element 40 does not contact the arrestor hook 42 .

[0046] The shape / profile of the arrester hook 42 is configured such that it cannot release the connection to the arrester element 40 by itself. The connection between the arrester element 40 and the arrester hook 42 can be configured in any way to contain the energy. This can be done by plastic deformation of the arrester element 40 and / or the arrester hook 42 or by friction. It is also conceivable to use a certain elasticity of the components.

[0047] Unlike the illustrated example, a symmetrical solution is also conceivable. For this purpose, it is possible to use longer arrester elements 40 protruding on both sides of the outer console part 22''' and two or more arrester hooks 42 on both sides of the console 22. It is also conceivable to use an arrester hook 40 formed longer on one side and multiple arrester hooks 42 on one side of the console 22. This makes it possible to take into account different positions / inclinations of the folding boom 20 when it falls and to ensure safe mid-catch.

[0048] FIG. 11 shows another embodiment in which an arrester hook 42' formed from two parallel metal plates is provided at the end of the console 22 or as an extension of the outermost console section 22''', and an arrester element 40' is disposed on the folding boom 20. For example, as shown in FIG. 11, one of the corner bars of the folding boom 20 can form the arrester element 40' to prevent and hold a fall from the arrester hook 42'. Of course, it is also possible to provide a separate arrester element 40' on the folding boom 20. The position and shape of the arrester hook 42' can also be different from the embodiment shown in FIG. 11. [Explanation of symbols]

[0049] 10 Mobile Crane 12 chassis 14 Superstructure 16. Boom 18 Boom Head 20 Folding Boom 22 Console 22' console section 22'' console 22'' console section 24 Retention elements 26 Laura 30 First fixation device 32 Second fixation device 34 Fixed arm 36 Nose 40 Arrester element 40' arrester element (corner bar) 42 Arrester hook 42' Arrester Hook 44 Clamp 50 Boom head fastening means 60 Folding boom fastening means

Claims

1. A mobile crane (10) comprising: a chassis (12); and an upper structure (14) having a telescopic boom (16) rotatable about a vertical axis relative to the chassis (12) and having a boom head (18) at its tip, the boom (16) having a holding means on one side for supporting a foldable boom (20) releasably assembled to the boom head (18), the boom (16) having a console (22) and a holding element (24) on one side thereof, the foldable boom (20) being supported by the console (22) and rotatable about the vertical axis of the holding element (24) at the boom head (18), a first fixing device (30) for restricting the movement of the folding boom (20) from deviating from the movement of pivoting about a vertical axis is arranged in the area of ​​the console (22); a second fixing device (32) capable of limiting vertical movement of the folding boom (20) is disposed on the side of the boom (16) between the first fixing device (30) and the boom head (18); The second fixing device (32) comprises a fixing arm (34) protruding from the boom (16), the fixing arm (34) being configured to prevent contact with the folding boom (20) when the folding boom (20) is in a transport position supported by the boom (16) and when the folding boom (20) is rotating about a vertical axis, and the fixing arm (34) has an upwardly protruding nose (36) at its tip.

2. The crane (10) of claim 1, A crane (10) characterized in that a first fixing device (30) is arranged on a console (22).

3. A crane (10) according to claim 1 or 2, The crane (10) is characterized in that the console (22) has a foldable structure and has at least two console sections (22', 22'', 22''') that are pivotally connected to each other and releasably hookable, and the console (22) is operable to be unfolded from a transport position to an assembly position for assembling a foldable boom (20) with a boom head (18), and vice versa.

4. A crane (10) according to claim 3, 1. A crane (10) comprising a console (22) configured such that the folding boom (20) is supported in a transport position on the boom (16) via at least one roller (26) of a first console part (22') fixedly connected to the boom (16), and such that the folding boom (20) rolls down over the at least one roller (26) along an upper side of the console (22) during a pivoting movement about a vertical axis of a holding element (24), so that the console (22) is deployed into an assembly position.

5. A crane (10) according to claim 3 or 4, The crane (10) is characterized in that the first fixing device (30) is arranged on a pivotable part (22''') of the console (22) that forms an end piece of the console (22) in the assembled position and is configured so that the folding boom (20) does not come into contact with the first fixing device (30) when in a transport position supported by the boom (16) and when pivoting about a vertical axis, and the upper side of the console (22) facing the folding boom (20) has a downwardly chamfered shape in the area of ​​the first fixing device (30).

6. A crane (10) according to any one of claims 3 to 5, The crane (10) is characterized in that the first fixing device (30) has a rod-shaped arrester element (40), and the arrester element (40) is configured so that an arrester hook (42) provided on the folding boom (20) engages with the arrester element (40) to prevent further movement of the folding boom (20) during a sliding motion from the console (22) that is different from a rotation motion around a vertical axis.

7. A crane (10) according to claim 6, A crane (10) characterized in that arrester elements (40) protrude from both sides of a console (22), two arrester hooks (42) provided on a folding boom (20) are arranged to engage with the arrester elements (40) on both sides of the console (22) when the folding boom (20) slides away from the console (22), and the arrester elements (40) can be formed of one part or multiple parts.

8. A crane (10) according to any one of claims 3 to 5, The crane (10) is characterized in that the first fixing device (30) has at least one arrester hook (42'), and the arrester hook (42') is configured such that, upon sliding movement of the folding boom (20) from the console (22), a rod-shaped arrester element (40') arranged on the folding boom (20) engages with the arrester hook (42') to prevent further movement of the folding boom (20).

9. A crane (10) according to claim 8, A crane (10) characterized in that the arrester element (40') is formed by a corner bar or connecting strut of the folding boom (20).

10. A crane (10) according to any one of claims 1 to 9, A crane (10) characterized in that the boom head (18) has fastening means (50) for connecting with corresponding fastening means (60) of the folding boom (20), at least one fastening means (60) of the folding boom (20) can be coupled together by the fastening means (50) of the boom head (50) by pivoting the folding boom (20) around the vertical axis of the holding element (24), and the folding boom (20) can be pivoted around the vertical axis of the fastening means (50, 60) coupled together after connecting one coupled fastening means (50, 60) and disconnecting it from the holding element (24), thereby allowing the remaining fastening means (50, 60) to be coupled together.

11. A folding boom (20) for a crane (10) according to any one of claims 1 to 10.

12. The folding boom (20) according to claim 11, A folding boom (20) having at least one roller (26) seated on the console (22) via the roller and rolling down on the console (22) during the pivoting of the holding element (24) about the vertical axis, the folding boom (20) having an arrester hook (42') or arrester element (40) which engages with a corresponding arrester element (40') or arrester hook (42) in the area of ​​the console (22) during a sliding movement of the folding boom (20) from the console (22) different from the pivoting movement about the vertical axis so that further movement of the folding boom (20) is prevented.

13. A crane (10) according to any one of claims 1 to 10, A crane (10) having a folding boom (20) according to claim 11 or 12.

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