EP0354167A1 - Crane, especially a crane for heavy loads - Google Patents

Abstract

The invention relates to a crane, especially a mobile crane for heavy loads, the underwagon of which has a rotary connection for a revolving superstructure which bears a jib at one end and at least one capstan at the other end. In order to design such a crane so that it can be produced with at least the same carrying capacity with simultaneous reduction of the travelling weight and shortening of equipping times in comparison with comparable devices at a lower cost and, nevertheless, has a higher degree of availability, in particular in terms of versatility of application, it is proposed that the capstans (15) are arranged on a pivot part (6) of the revolving superstructure, said pivot part being articulated so that it can be pivoted upwards via a horizontal pivot bearing (9) on the revolving superstructure centre part (5) attached to the rotary connection (3) and having at its end opposite the pivot bearing (9) a luffing gear (17) with roller head (16) for staying (25) the jib (7, 23, 24). …<IMAGE>…

Description

The invention relates to a crane, in particular a mobile large crane with an undercarriage carrying an at least one boom, in particular lattice boom supporting superstructure via a rotary connection.

Cranes of the aforementioned type essentially consist of a - often mobile - undercarriage or undercarriage, an upper carriage rotatable thereon about a vertical axis and at least one boom which can be pivoted in the vertical plane, at the upper end of which further booms can be articulated. For the raising - and also lowering - of the main boom, various devices are known and also required, as is evident, for example, from DE-PS 29 33 382. Although the measures specified in this patent cope with the requirements relating to the stability of the crane in use and its load-bearing capacities, these measures not only mean a considerable outlay in terms of construction and thus also considerable weights for the device, but also a time expenditure when the and dismantling the device.

In addition, legal regulations for mobile cranes on the roads limit the permissible axle loads. These regulations lead to a high number of axles, particularly for large mobile cranes, so that ten-axis devices are not uncommon. This also means elaborate undercarriage designs, which require extraordinarily strong drive units to transport the entire vehicle. This drive must be transferred to several axles that are far apart from one another via a complex longitudinal differential. Because of its high performance, the drive of the undercarriage cannot be used economically for crane operation be pulled so that an additional drive unit with the usual peripherals for the crane is provided in the superstructure. In this regard, DE-OS 36 39 709 proposals have been made to reduce the manufacturing costs.

However, none of these previously known proposals could change the fact that the requirement of the highest possible load capacities could only be met with a correspondingly high construction effort - with the consequence of considerably higher weights - with the disadvantage of costly set-up times.

The invention has for its object to design a crane of the type mentioned in such a way that it can be produced with lower costs and at least the same load capacity while reducing the set-up time and shortening the set-up times compared to comparable devices at lower costs and yet has greater availability, in particular versatility.

In a departure from previous proposals, the solution according to the invention is based on the idea that the entire problem is not primarily addressed by constructive measures on the undercarriage, but in a fundamentally different superstructure concept, and consists in that at least part of the superstructure or its longitudinal axis is at an angle to Longitudinal axis of the undercarriage is adjustable. In particular, it is provided that the superstructure is divided into at least two parts and its part facing away from the main boom (hereinafter referred to as "swivel part") can be pivoted in a vertical plane relative to the part connected to the rotary connection (hereinafter referred to as "middle part").

This concept surprisingly results in considerable simplifications, and in detail below Design options still to be discussed, including in particular the elimination of the otherwise usual assembly support, with the surprising possibility of using their overall height for the overall height of the load-bearing supporting structure (superstructure according to the invention) or of benefiting other components with the spatial advantage obtained by the inventive concept Let come, for example, the undercarriage, which again higher loads than with comparable large devices are possible. The construction height gain possible through the invention, ie the comparatively lower construction height, can of course also be used as such if, for example, the maneuverability and use in covered terrain are considered. In addition, this results, in particular through the elimination of the assembly support, in a reduction in costs and a reduction in driving weight, so that instead of an otherwise required ten-axle undercarriage, at most eight axles are now required for the same output.

In particular in the case of cranes provided with lattice booms, the invention has an extremely advantageous effect, since assembly for erecting the crane is considerably simplified, since a longer boom foot is now possible due to the lower superstructure weight with the same high load capacity of the undercarriage.

The new design of the uppercarriage according to the invention still allows the central part to identify or carry a driver's cab on the side facing away from the pivoting part, preferably in the area of the main boom foot, so that the operating personnel need not change significantly.

The conception according to the invention results in a surprising number of adaptable configurations of the uppercarriage, all of which have the advantages shown above and furthermore lead to further simplifications or optimizations. Of these possibilities specified in detail in the subclaims, a particularly rational and structurally inexpensive embodiment is addressed, in which the central part is designed as a flat plate lying on the rotary connection and connected to it, over which the pivoting part extends at least partially. The dimensions of the plate can correspond approximately to those of the slewing ring. With the same vehicle length, the swivel part can therefore be correspondingly longer and thus more effective in terms of its mode of action and range.

If, in a preferred embodiment, the swiveling part carries winches and is equipped with a roller head and rope pulleys for a pull-in mechanism, the particular advantage of the invention is shown, since it achieves that the superstructure for winches and for the counterweight can now also be used as an assembly support with a set of rollers and as a counter jib while saving a second main jib foot. Another advantage of this design is that the cylinder (s) pivoting the superstructure or part of it against the horizontal also serves to accommodate the counterweight plates, the pivotable uppercarriage part being, so to speak, the jib of an auxiliary crane that in comparable devices for this set-up work is additionally needed and at least during this set-up time is missing in other work, which also saves set-up times and the desired goal for such large devices, driving at night, complete use during the day, can be achieved.

The free end of the swivel part is preferably equipped with a counterweight receptacle, which consists of a hydraulic cylinder with a possibility of hooking in at its free end. The arrangement of this hydraulic cylinder enables vertical adjustment of the counterweight.

A further advantageous adaptation of the counterweight effects to the respective use of the crane can be achieved if, according to a further advantageous embodiment, at least one hydraulic cylinder is articulated on the central part, which in the working position - preferably directed essentially horizontally - engages with its free end on the counterweight. This enables a continuous change of the counterweight lever arm.

For the connection between the middle part and the swivel part of the superstructure, the invention provides a swivel connection, preferably a swivel cylinder between the middle part and the swivel part, which are connected via at least one swivel bearing with a preferably horizontal axis running perpendicular to the longitudinal axis of the superstructure. This basic concept of the swivel connection between the swivel part and the middle part opens up a variety of advantageous solution options for the structural design of the connection. For example, the swivel bearing can be located at the level of the rotary connection, preferably on the side of the middle part facing away from the driver's cabin. In this case, the swivel cylinder should be hinged to the middle part in the region of the upper edge thereof. If, in a further embodiment, the swivel bearing is arranged on the side of the middle part facing the driver's cab, a particularly simple but effective possibility results, namely by the middle part being a simple plate can be formed, which lies flat on the rotary connection and is connected to it, both the pivot bearing and the articulation point of the pivot cylinder on the central part are approximately at the height of the rotary connection and the end connected to the pivot part to the driver's cab end of the central part or the plate-facing pivot cylinder is articulated at its other end to the end of the middle part or the plate facing away from the driver's cab, so that the pivot part extends at least partially in a space-saving manner over the plate.

On the other hand, however, the pivot bearing can also be located in the area of the upper edge of the middle part for certain purposes, either on the side of the middle part facing away from the driver's cab or in the middle above the rotary connection, which is readily apparent advantageous variants for introducing the forces, in particular the opposing forces in the superstructure and thus optimal utilization of the slewing ring. In this version, the swivel cylinder is expediently articulated on the side of the central part facing away from the driver's cab, approximately at the level of the rotary connection.

In all of the aforementioned versions, the swivel part can be braced as a jib, so to speak, of an auxiliary crane via the pull-in mechanism with the jib foot of the main jib, the jib foot possibly bearing a counterweight. Since the swivel connection between the middle part and the swivel part is infinitely adjustable in relation to one another (floating), in cooperation with another feature of the invention, namely the extensibility of the swivel part, a variable adaptation of the crane properties to local conditions, both with regard to possible building and other conditions spatial obstacle nisse as well as possible with regard to the load differences. Because the uppercarriage is now not only designed for counterweight support by the invention, the uppercarriage can also be used as the main boom for normal crane operation, the main boom being able to remain in the driving position, ie, and the guying of the swivel part provided for crane operation as Boom on the main boom or his foot can be done. This possible application offers particular advantages when working inside buildings where there are only relatively low room heights.

In order to simplify the crane operation even further, the swivel part can be bolted in front of the front middle part, that is to say in the direction of view of the driver's cab, in a further embodiment of the invention. On the other hand, in this situation, a heavier telescopic crane boom can then be attached to the rear part, so that the optional use of lattice boom and telescopic booms is possible without the need for several devices, with the aforementioned extraordinary for all possible uses and structural designs The advantage of eliminating a separate assembly support and additional accessories, which saves weight, manufacturing costs and time.

In order to increase the load capacity, the further proposal of the invention serves to make the superstructure, in particular its pivoting part, extendable. This extension can be gradual, by arranging one or more, preferably different lengths of intermediate pieces after bolting the roller set between the roller head and the cable winch part of the swivel part, or also continuously by equipping the swivel part at least over part of its length as a telescopically retractable and extendable carrier consequences. Of course, a combination of gradual and infinite extensibility is also possible within the scope of the invention.

The stepless and / or gradual extension of the swivel part should be accompanied by a corresponding vertical extensibility of the counterweight receptacle, for example by means of correspondingly long hydraulic cylinders for suspending the counterweight, which may be equipped with intermediate pieces.

Finally, a division of the pivoting part into two parts is proposed according to the invention, wherein the pivoting part can consist of a main support and a guy support. This solution becomes structurally particularly simple when the guy support lies flat on the main support in the resting or driving position and extends almost over the entire length of the main support and is preferably adapted in outline to the main support. The tensioning beam can be pivotally connected at one end to the main beam near its roller head, while its other end is attached to the pivot cylinder. This design results in a particularly stable guying concept without increasing the weight of the superstructure, i.e. without impairing the advantages of the uppercarriage, which according to the invention is divided into two parts, into a central part and a pivoting part, which are connected to one another in an articulated manner and are infinitely adjustable in terms of their longitudinal axes.

• Fig. 1 Einen Kran in Transportstellung mit einer ersten erfindungsgemäßen Ausführung des Oberwagens;
• Fig. 2 den Kran gemäß Fig. 1 in Arbeitsstellung;
• Fig. 3 bis 6 weitere Ausführungsformen des Oberwagens mit er­höhter Kran-Tragfähigkeit, jeweils in Arbeitsstel­lung;
• Fig. 7 bis 12 drei weitere Ausführungsmöglichkeiten für die erfindungsgemäße Schwenkverbindung der Oberwagen­teile, jeweils in Transport- und Arbeitsstellung;
• Fig. 13 die Arbeitsstellung in einer Ausführung, bei der das Schwenkteil als Ausleger genutzt wird;
• Fig. 14 eine weitere Ausführungsform, bei der das Schwenk­teil zweigeteilt ist, in Transportstellung;
• Fig. 15 den Kran gemäß Fig. 14 in Arbeitsstellung;
• Fig. 16 die in den Fig. 14 und 15 dargestellte Schwenk­teilversion mit weit außerhalb des Bereichs der Drehverbindung liegendem Schwenklager, in Trans­portstellung; und
• Fig. 17 den Kran gemäß Fig. 16 in bevorzugter Arbeitsstel­lung.

Further refinements and advantages of the invention are specified below in connection with the explanation of the accompanying drawings. Show it:

• 1 shows a crane in the transport position with a first embodiment of the superstructure according to the invention;
• FIG. 2 the crane according to FIG. 1 in the working position;
• Fig. 3 to 6 further embodiments of the superstructure with increased crane load capacity, each in the working position;
• 7 to 12 show three further design options for the swivel connection of the superstructure parts, in each case in the transport and working position;
• 13 shows the working position in an embodiment in which the swivel part is used as a boom;
• 14 shows a further embodiment, in which the swivel part is divided into two, in the transport position;
• 15 shows the crane according to FIG. 14 in the working position;
• 16 shows the pivot part version shown in FIGS. 14 and 15 with the pivot bearing lying far outside the region of the rotary connection, in the transport position; and
• 17 shows the crane according to FIG. 16 in a preferred working position.

In the following description, the same reference numerals are used for identical or equivalent components, for the sake of clarity, only the most important reference numerals are entered in FIGS. 3 to 17.

The large crane shown in Fig. 1 consists of a crane chassis 1 with wheels 2, a superstructure arranged according to the invention, which is arranged thereon and which can be pivoted about a vertical axis 4 via a ball or roller rotating connection 3, which consists of a central part 5 and a pivoting part 6.

As can be seen from the drawing in accordance with FIG. 1, as is customary in conventional cranes of this type, there is a driver's cab 8 on the superstructure in the direction of the main boom foot 7 articulated thereon. On the side of the middle part 5 of the superstructure opposite the driver's cab 8 the mentioned pivot part is bolted on, in the exemplary embodiment shown here with a pivot bearing 9 arranged approximately at the level of the rotary connection 3, which allows pivoting of the pivot part 6 about an essentially horizontal axis. For this purpose, at the level of the upper edge of the middle part 5 in the area between the articulation point 11 of the cantilever foot 7 and the vertical axis 4, a hydraulic swivel cylinder 13 is pivotably attached to a articulation point 12, which with its free piston end in the area of the top edge of the swivel part at a corresponding articulation point 14 attacks such that in the transport situation shown in Fig. 1, the pivot cylinder 13 assumes a horizontal position.

As is also clear from FIG. 1, the swivel part 6 carries the cable winches 15 required for the crane and, at its free end, a roller head 16 with the cable rollers of a pull-in mechanism 17 shown in FIG. 2.

In Fig. 2 the crane is shown in FIG. 1 in the working position, which is essentially achieved in that the pivot cylinder 13 is actuated, ie in the present case is retracted so that the pivot part 6 pivots about the pivot bearing 9 in a vertical plane and thus the longitudinal axes of the two uppercarriage parts, in contrast to the transport position, now run at an angle to one another.

As can further be seen from FIG. 2, a hydraulic cylinder 19 is provided for attaching a counterweight 18 to the free end of the swivel part 6, via which the counterweight 18 can be moved up and down in the vertical direction. The individual plates of the counterweight 18 can be suspended using appropriate ropes 21. To stabilize the position of the hanging counterweight 18, two further hydraulic cylinders 22 are provided, which are articulated at their base in the area of the pivot bearing 9 and act on the counterweight 18 with their free piston end. However, these hydraulic cylinders 22 not only have the task of stabilization, but also make it possible in a simple and extremely advantageous manner to change the position of the counterweight 18 horizontally, so that via the hydraulic cylinders 19 and 22 a very sensitive and variably adaptable counterweight positioning depending on the position desired load capacity and the outreaches is possible, since both the height and lever arm of the counterweight 18 can be adjusted optimally and quickly.

Fig. 2 further shows the lattice boom in a steep inclined position with shots 23 and 24 additionally bolted onto the jib foot, rearward bracing 25 taking place from the retractor 17 to the head of the main boom, via which the load rope 26 to be actuated by the cable winches 15 also runs.

Finally, Fig. 2 also shows that when working hard in the working position hydraulically laterally and vertically extendable support feet 27 relieve the wheels 2 and ensure a safe and wide ground support.

For the description of the further exemplary embodiments, details already described above in connection with the explanation of FIGS. 1 and 2 can be dispensed with, insofar as they also apply to the following exemplary embodiments, so that the description deals with the essential differences between the exemplary embodiments.

3 to 6, which represent variants for changing the length of the swivel part 6, the swivel bearing 9 is, as in the previously explained embodiment, on the lower right side of the upper carriage middle part 5, while also in accordance with the previously explained exemplary embodiment of the swivel cylinder 13 with its articulation points in the upper region of the middle part 5 and the swivel part 6. Furthermore, in these embodiments, in accordance with the example according to FIGS. 1 and 2, an infinitely variable adjustability of the swivel position of the swivel part 6 is possible by correspondingly extending or retracting the swivel cylinder 13 - of course, several swivel cylinders can also be arranged in parallel and then in each case accordingly with a smaller diameter - the end position is determined on the block position. Intermediate rings, which can be attached to the piston rod, allow changeable angular positions of the superstructure swivel part, whereby the middle part and swivel part are mechanically locked using the swivel cylinder (s) for the standard load capacity. In the Working position for increased load capacity is not locked, so that the swivel cylinder is (is) in the floating position.

In Fig. 3 an extension of the pivoting part is provided to approximately twice its length, wherein after the roller head 16 has been bolted off, an intermediate piece 28 is inserted between it and the rest of the pivoting part 6 and is releasably bolted. At the same time, a corresponding extension rod 29 or the like can be attached to the hydraulic cylinder 19 serving to suspend the counterweight 18.

Correspondingly, according to FIG. 4, an even greater extension of the pivoting part is achieved by bolting in an even longer intermediate piece 31 with a corresponding extension of the counterweight suspension via a correspondingly longer rod 32. 5 shows the addition of the two extension options according to FIGS. 3 and 4, so that a very wide rearward outreach for the counterweight 18 can then be achieved.

In the possibility shown in FIG. 6, the swiveling part 6 is continuously and automatically extended by a push-out device 34 which extends or retracts the telescopic section 33 provided at least over part of the swiveling part 6 at its end. It should be mentioned in this context that there is also the possibility, in the case of the swivel part 6 provided with the telescopic part according to FIG. 6, intermediate pieces 28 and 31 between the roller head 16 and the swivel part 6 in the manner shown in FIGS. 3 to 5 to bolt in.

In the exemplary embodiments shown in FIGS. 7 to 10, the pivot bearing 9 is located laterally at the top right on the central part 5, while the pivot cylinder or cylinders 13 are articulated below at approximately the level of the rotary connection 3. The cantilever foot 7 is also mounted on the middle part 5, this articulation point 11 being located approximately at the level of the pivot bearing 9.

The difference between the embodiment according to FIGS. 7 and 8 and that according to FIGS. 9 and 10 is that in the latter the pivot bearing 9 is arranged centrally above the rotary connection 3 at the upper part of the central part 5, whereby a particularly central introduction of the the swivel part supporting forces in the rotary connection is possible.

11 and 12 there is a particularly inexpensive and structurally clear way of executing the uppercarriage which is divided into two parts according to the invention, namely that the central part 5 is designed as a flat plate which rests on the rotary connection 3 and is connected to it in a rotationally fixed manner, via which plate is in the transport position (See FIG. 11) the pivot part 6 extends with its articulation area. The pivot bearing 9 is located laterally at the bottom left on the middle part 5 and also the pivot point for the pivot cylinder 13 lies on the middle part at approximately the same vertical height as the pivot bearing 9, the pivot cylinder 13 pointing with its other end in the direction of the main boom foot 7 and on the top side is articulated on the swivel part 6. As shown in FIG. 12 in particular, this results in a particularly favorable static support position for the swivel cylinder 13 in the working position. The dimensions of the plate-shaped central part 5 can correspond approximately to those of the rotary connection 3. Please note in this embodiment still that the articulation point 11 for the cantilever foot 7 is now in the swivel part 6, to the side somewhat above the swivel bearing 9.

In the embodiment shown in FIG. 13 in the working position, the uppercarriage concept shown in FIGS. 1 and 2 is used and the swivel part 6 is used as a jib of an auxiliary crane, the foot 7 of the main boom being braced via the retracting mechanism 17 and preferably without Counterweight 35 works, so that the swivel part 6 can now be used, for example, as an auxiliary crane for receiving its counterweight; this can also be carried out with a higher load capacity with counterweight or ballast 35 on the boom foot 7.

14 to 17 are finally exemplary embodiments with a swivel part 6.1; 6.2 shown, the lower, the cable winches 15 and the roller head 16 carrying larger part quasi as the main support 6.1 and the smaller, upper part as anchoring support 6.2. A particularly compact, space-saving and at the same time enormously stable construction is clearly achieved. 14 and 15 for the main support 6.1 laterally at the bottom right on the middle part 5 at approximately the height of the rotary connection 3. The pivot cylinder 13 is or are arranged on the top side and directly with the free end of the guy support connected, which is articulated at its other end near the roller head 16 on the main carrier 6.1. After swiveling the swivel part 6.1; 6.2 by retracting the pivot cylinder 13, for example into the position shown in FIG. 15, form the pivot cylinder 13 and the guy support 6.2 the guy for the swivel part, a coupling member 36 between the main carrier 6.1 and the guy support 6.2 prevents the deflection of the guy under pressure. The main boom foot 7 is mounted on the middle part near the articulation point of the pivot cylinder 13 at 11.

In contrast to the embodiment according to FIGS. 14 and 15, the pivot bearing 9 in the exemplary embodiment according to FIGS. 16 and 17 lies far outside the region of the rotary connection 3 on the central part 5, which extends relatively far in the direction of its longitudinal axis in comparison to the other exemplary embodiments 17, so that, according to FIG. 17, in the working position for the swivel part, in particular the main support 6.1, there is a vertical position which is advantageous for some applications. In particular, the counterweight 18 can be placed on a bracket 37 fastened in the region of the pivot bearing 9, as a result of which a stable positioning of the counterweight 18 is guaranteed.

Claims (29)

1. crane, in particular a mobile large crane, the undercarriage of which carries a slewing ring for an uppercarriage which has a jib at one end and at least one winch at the other end,
characterized,
that the winches (15) are arranged on a swivel part (6) of the uppercarriage, that a horizontal swivel bearing (9) is pivotally articulated on the central part (5) of the uppercarriage fixed to the rotary connection (3) and that the swivel bearing ( 9) opposite end has a pull-in mechanism (17) with roller head (16) for guying (25) the boom (7, 23, 24). 2. Crane according to claim 1,
characterized,
that the central part (5) is formed as a flat on the rotary connection (3) and connected to this plate, over which the pivot part (6) extends partially. 3. Crane according to claim 2,
characterized,
that the dimensions of the plate correspond approximately to those of the rotary connection (3). 4. Crane according to one or more of claims 1 to 3
marked by
a counterweight holder at the free end of the swivel part (6). 5. Crane according to claim 4
marked by
at least one hydraulic cylinder (22) articulated on the central part (5), which in the working position - preferably directed essentially horizontally - engages with its free end on the counterweight (18). 6. Crane according to one or more of claims 1 to 5
marked by
a swivel connection, preferably a swivel cylinder (13) between the central part (5) and the swivel part (6), which are connected via at least one swivel (9) with a preferably horizontal axis running perpendicular to the longitudinal axis of the superstructure. 7. Crane according to claim 6,
characterized,
that the pivot bearing (9) is at the level of the rotary connection (3). 8. Crane according to claim 6 or 7,
characterized,
that the pivot bearing (9) is on the side of the middle part (5) facing away from the driver's cab (8). (e.g. Fig. 1 to 6) 9. Crane according to one or more of claims 6 to 8,
characterized,
that the pivot cylinder (13) is articulated to the upper part of the central part (5). 10. Crane according to claim 1,
characterized,
that the pivot bearing (9) is located on the side of the central part (5) facing the driver's cab (8). (e.g. Figs. 11 and 12) 11. Crane according to claim 1,
characterized,
that both the pivot bearing (9) and a pivot point (12) of the pivot cylinder (13) on the central part (5) are approximately at the level of the rotary connection (3) and the end connected to the pivot part (6) towards the driver's cab end of the Middle part (5) or the plate-facing pivot cylinder (13) is articulated with its other end to the end of the middle part (5) or the plate facing away from the driver's cab (8). 12. Crane according to claim 6,
characterized,
that the pivot bearing (9) is in the area of the upper edge of the central part (5). (e.g. Fig. 7 to 10) 13. Crane according to claim 12,
characterized,
that the pivot bearing (9) is on the side of the middle part (5) facing away from the driver's cab (8). 14. Crane according to claim 12,
characterized,
that the pivot bearing (9) is arranged centrally above the rotary connection (3). (Figs. 9 and 10) 15. Crane according to one or more of claims 12 to 14,
characterized,
that the swivel cylinder (13) is articulated on the side of the central part (5) facing the driver's cab (8) approximately at the level of the rotary connection (3). 16. Crane according to one or more of claims 1 to 15,
characterized,
that the swivel part (6) is braced as a boom (auxiliary crane) via the pull-in mechanism (17) with the boom foot (7) of the main boom. (Fig. 13) 17. Crane according to claim 16,
characterized,
that the cantilever foot (7) carries a counterweight (18). 18. Crane according to one or more of claims 1 to 17,
characterized,
that the swivel part (6) can be extended. (e.g. Fig. 3 to 6) 19. Crane according to claim 18
marked by
a gradual extensibility of the swivel part (6). (Figs. 3, 4 and 5) 20. Crane according to claim 18 or 19
marked by
at least one intermediate piece to be detachably fastened between the roller head and the cable winch part of the swivel part (6). 21. Crane according to claim 20,
characterized,
that several intermediate pieces of different lengths are provided. 22. Crane according to claim 18
marked by
stepless extension of the swivel part (6). (Fig. 6) 23. Crane according to claim 18 or 22,
marked by
that the swivel part (6) is equipped at least over part of its length as a telescopic (34) retractable and extendable support. 24. Crane according to one or more of claims 18 to 23
characterized,
a combination of gradual and continuous extensibility. 25. Crane according to one or more of claims 1 to 24,
characterized,
that the swivel part (6) consists of a main support (6.1) and a guy support (6.2) which is pivotally connected at one end to the main support (6.1) near the roller head (16), while its other end is attached to the swivel cylinder (13) is. 26. Crane according to claim 25,
characterized,
that the guy support (6.2) lies flat on the main support (6.1) in the rest or driving position and extends almost over the entire length of the main support and is preferably adapted to the outline of the main support. 27. Crane according to one or more of claims 1 to 26,
characterized,
that the pivot bearing (9) lies far outside the area of the rotary connection (3) at the level of its horizontal plane. (Figs. 16 and 17) 28. Crane according to claim 27
marked by
a bracket (37) for the counterweight (18) which is supported in the region of the pivot bearing (9) and is hinged to the pivoting part (6.1) and can be folded down. (Fig. 17) 29. Crane according to one or more of claims 1 to 28,
characterized,
that the pivoting part (6) can be bolted to the side of the middle part (5) facing the driver's cabin (8), so that the side of the middle part facing away from the driver's cabin (8) is available for bolting on a main boom.

Images