EP3328780A1

EP3328780A1 - Mobile crane and method for angling a main jib extension relative to a main jib of a mobile crane

Info

Publication number: EP3328780A1
Application number: EP16793863.8A
Authority: EP
Inventors: Michael Martin; Traugott Feß; Roland Kuhn
Original assignee: Terex Global GmbH
Current assignee: Terex Global GmbH
Priority date: 2015-11-10
Filing date: 2016-11-08
Publication date: 2018-06-06
Anticipated expiration: 2036-11-08
Also published as: EP3328780B1; CN108137295B; CN108137295A; DE102015119379B3; US10640339B2; WO2017081021A1; US20180346291A1

Abstract

The invention relates to a mobile crane having a main jib (2) that is mounted thereupon for luffing and that can be oriented by means of a luffing cylinder (7), and a main jib extension (1) which is detachably connected to a main jib head (2a) of said main jib (2) by means of upper and lower bolts (4c), it being possible to angle said main jib extension (1) about a luffing axis (w) relative to the main jib (1) proceeding from a base position following release of the upper or lower bolts (4c) and using an angle drive (6j), said angle drive engaging with a foot (1c) of the main jib extension (1), a maximum angling angle (b) being delimited by an adjustable angling plate (5), and said angling plate (5) engaging with the foot (1c) of the main jib extension (1) and the main jib head (2a). In order to obtain a mobile crane which simplifies angling of the main jib extension, it is suggested that the angle drive (6j) is a component of an angling plate (5) in the form of a combi-angling plate (6). The invention also relates to a method for angling this main jib extension.

Description

Mobile crane and method for tilting a main boom extension relative to a main boom of a mobile crane

The invention relates to a mobile crane with a rocker mounted thereon and erectable via a luffing cylinder main boom and with a detachable on a

Main boom head of the main boom via upper and lower bolts connected main boom extension, the main boom extension from a basic position after a release of the upper or lower bolt by means of a Abwinkelantriebs about a rocking axis relative to the main boom is angled, the Abwinkelantrieb acts on a foot of the main boom extension, a maximum angle of deflection is limited by an adjustable Abwinkelellasche and the Abwinkellasche at the foot of the main boom extension and the

Main boom head attacks. Also, the invention relates to a method for bending in a

Main boom extension relative to a main boom of a mobile crane.

German Utility Model DE 20 2004 020 760 U1 already discloses a mobile crane with a main boom and a main boom extension fastened to its main boom head. The main boom extension is from a home position in which the main boom extension with its

Longitudinal direction is aligned in extension of the longitudinal direction of the main boom, in a 20 ° position and a 40 ° position tiltable. The

Main boom extension is usually over two lower in the range of lower boom of the main boom extension and two upper in the range of

The upper boom of the main boom extension bolts arranged releasably attached to the main boom head. Around the main boom extension around as

In a first step, the two upper bolts are pulled and in a second step, hydraulic rocker cylinders, which engage the main boom head and the main boom extension, cause the rocker axes of the two rocker pins to rock from the basic position

Main boom extension effected. The two upper pins are inserted and removed via a hydraulic bolting cylinder. To supply the luffing cylinder and the bolting cylinder, a self-sufficient hydraulic unit is arranged at the lower end of the main boom extension. When Hydraulic unit, for example, a diesel engine or electric motor can be used in each case with an associated hydraulic pump.

Also, from the German patent DE 103 21 493 B4 a mobile crane with a main boom extension and a Abwinkellasche known. The Abwinkellasche is designed as mechanically lockable telescopic device with a tubular guide tab and a guided and extendable therein

Sliding tab, which is also tubular. The guide tab has stop apertures for receiving bolts which provide support for the slide tab at its lower end and thus provide a preselected length of the angled tab and thus angular adjustment of the main boom extension. The Abwinkellasche is located in the region of a lower flange of the main boom and the main boom extension. The desired angulation is achieved by lifting the main boom, thereby shortening the angled tab until the sliding tab hits and is supported on the bolt.

In addition, European Patent Application EP 2 253 576 A1 discloses another embodiment of an angle bracket for bending a main boom extension of mobile cranes. The formed from two angle levers Abwinkellasche has in its basic position corresponding to a 0 ° position of the main boom extension to the main boom, a plurality of pairs of aligned stop openings for bolts. Through a choice of a pair of stop holes for the bolts, the length of the angle bracket can be varied and the main boom extension in various angular positions, preferably 0 °, 20 ° and 40 °, set. The actual Abwinkelbewegung the main boom extension is done by means of a hoist located on the crane or next to the crane.

It is an object of the present invention to provide a mobile crane and a method for tilting a main boom extension relative to a main boom of a mobile crane, with which the inclination of the main boom extension is simplified.

This object is achieved by a mobile crane having the features of claim 1 and by a method having the features of claim 10. Advantageous embodiments of the invention are in the subclaims 2 to 9 and 11 specified.

According to the main boom extension, the main boom extension starting from a basic position after loosening the upper bolt or the lower bolt by means of a mobile crane with a rocker mounted thereon and aufrichtbaren about a luffing cylinder main boom extension connected to a main boom head of the main boom an Abwinkelantriebs about a rocking axis relative to the main boom

is bendable, the Abwinkelantrieb attacks on one foot of the main boom extension, a maximum angle of deflection is limited by an adjustable Abwinkellasche and the Abwinkellasche attacks on the foot of the main boom extension and the main boom head, thereby achieving a simplification that the Abwinkelantrieb part of a Abwinkellasche in the form of a combi Abwinkellasche is. Advantageously, thus, a known passive mechanical limiting Abwinkellasche is converted into a hydraulically assisted combination Abwinkellasche, which also provides the mechanical limit. By the

Integration of the Abwinkelantriebes in the combination Abwinkellasche are no

additional force application points on the main boom head or

Main boom extension required. The bending itself is largely at the bottom or the storage position of the main boom, so that it is not necessary to work well above the top of the mobile crane. The

This invention allows the main boom extension to be bent when the mobile crane is on a level ground with a horizontally oriented telescopic boom. For the last part of the whip extension of the main boom extension into a 20 ° or 40 ° position, the luffing cylinder of the main boom is used. Since the extension of the hydraulic cylinder of the Abwinkelantriebs can be chosen freely, can at a longer chosen extension of the

Abwinkelantrieb be designed relatively independent of terrain. Since the combination Abwinkelellasche attacks in the area of the foot of the main boom extension is no fork head offset between main boom and

Main boom extension required, a deformation of the

Main boom extension compensates. This is especially important for long narrow boom systems. Also, this does not require an auxiliary cylinder over which a fork head offset must be compensated. It is preferably provided that the Abwinkelantrieb one hand on the

Main boom head and on the other hand at the main boom extension attacks. In this case, in particular the Abwinkelantrieb is designed such that the

Main boom extension against the gravitational effect of

Main boom extension about the rocker axis pivotally raised and lowered.

In an advantageous embodiment it is provided that, starting from a basic position after loosening the upper bolts, the main boom extension can be bent by means of the Abwinkelantriebs a Wippachse in the region of a lower chord of Hauptauslegerverlängerung and the Abwinkelantrieb engages in the upper belt of the main boom extension.

It is particularly advantageous that the Abwinkelantrieb is designed as a hydraulic cylinder with housing and rod.

In a structurally simple and advantageous embodiment, it is provided that the combination Abwinkellasche consists of a sliding tab, a guide tab and the Abwinkelantrieb, the Abwinkelantrieb drivingly on the one hand on the sliding tab and on the other hand on the guide tab attacks and on the

Abwinkelantrieb the sliding latch is displaceable relative to the guide plate. In this case, in particular the Abwinkelantrieb is releasably attached to the sliding latch. Particularly preferably, the sliding plate is pivotally mounted on the main boom head, the guide plate pivotally mounted on the main boom extension, the sliding tab guided in the guide tab and a

Stop bolts a maximum displacement of the sliding latch in the

Guide tab can be limited.

According to the invention, in a method for bending in a

Main boom extension relative to a main boom of a mobile crane, in particular a previously described mobile crane, wherein the main boom is tiltably mounted on the mobile crane and erectable via a luffing cylinder, the

Main boom extension is releasably connected to a main boom head of the main boom via upper and lower bolts, a Abwinkelantrieb on a foot of the main boom extension attacks, a maximum angle of deflection by a adjustable Abwinkellasche is limited and the Abwinkellasche attacks on the foot of the main boom extension and the main boom head, a simplification achieved in that by means of the Abwinkelantriebs, the part of a

Abwinkellasche in the form of a combo Abwinkellasche is, the

Main boom extension is raised starting from a home position about a rocking axis relative to the main boom, as far as the upper or lower bolts are relieved, then the upper or lower bolts are removed, between the main boom head and a top flange or lower flange of the main boom extension at least one combination Abwinkellasche used is or is already used, by means of Abwinkelantriebs the

Main boom extension is lowered until the maximum

Abwinkelstellung is reached or a head of the main boom extension comes to rest on a floor, the Abwinkelantrieb is drivingly separated from the combination Abwinkellasche and if the maximum Abwinkelstellung is not reached, by raising the main boom, the main boom extension is angled until reaching the desired angle of deflection. With regard to the advantages associated with this, reference is made to the statements above for the mobile crane. Preferably, it is provided that the main boom extension is raised from a home position about a rocking axis relative to the main boom, as far as the upper bolts are relieved, then the upper bolts are removed, between the main boom head and a top flange

Main boom extension at least one combi Abwinkellasche is used or is already used.

In the context of the present invention, a mobile crane is understood as meaning both a mobile telescopic crane and a movable crawler crane with a lattice boom.

The invention will be explained in more detail with reference to an embodiment shown in a drawing. Show it:

1 shows a side view of a main boom extension in a basic position on a main boom, FIG. 2 shows a detailed view of FIG. 1 from the area of the coupling of FIG

Main boom extension to the main boom, Figure 3 is an exploded view of a combination Abwinkellasche of Figure 2,

4a is a detail view of a combination Abwinkellasche in the position shown in Figure 1, Figure 4b is a side view of Figure 4a,

FIG. 5 shows a sectional view of FIG. 4b along the section line B-B,

FIG. 6 shows the main boom according to FIG. 1 with the main boom extension in a 15 ° position,

7a is a detail view of a combination Abwinkellasche in the position shown in Figure 6, Figure 7b is a side view of Figure 7a,

8 shows the main boom according to FIG. 1 with the main boom extension in a 40 ° position, FIG. 9a shows a detail view of a combination angle bracket in the position according to FIG. 8, FIG.

FIG. 9b shows a side view of FIG. 9a, FIG. 10 shows an exploded view of a combination angle flap in an alternative embodiment,

FIG. 11 a shows a detailed view of a combined combination bent-off angle pocket according to FIG. 10 and FIG Figure 1 1 b is a side view of Figure 1 1 a.

In the figure 1 is a side view of a main boom extension 1 in

Basic position shown on a main boom 2. The main boom 2 is designed as a telescopic boom with a base box 2 b and corresponding telescopic shots 2 c. At the free end of the innermost telescopic section 2c, a main boom head 2a is provided. The main boom 2 is part of a telescopic crane, not shown, and is in the usual way via a hydraulic rocker cylinder 7, which is supported on an upper carriage 8 of the telescopic crane, erectable. The superstructure 8 is indicated only by a frame part hereof in Figure 1. In the figure 1, the main boom extension 1 and the

Main boom 2 shown in a so-called stowed position in which the

Main boom extension 1 with its longitudinal direction v and the main boom 2 with its longitudinal direction h are aligned substantially horizontally. A so-called Wippwinkel a of the main boom 2 relative to the superstructure 8 is thus in the stored position 0 °. With the rocking angle a, the erection of the

Main boom 2 relative to the superstructure 8 described. To the

Main boom head 2a is the main boom extension 1 via a

Bolt connection releasably attached. The main boom extension 1 can be used temporarily or permanently with the telescopic crane to a larger than the largest boom length of the main boom 2 even greater

Total length of the boom to achieve.

This main boom extension 1 is divided into a trained as a lattice mast boom 1 a, which is a truss pipe construction in the usual way, and a subsequent thereto tip 1 b, which is designed as a box boom. The main boom 2 and the main boom extension 1 are in Figure 1 in a 0 ° position or normal position in which the longitudinal direction h of the main boom 1 and the longitudinal direction v of the main boom extension 1 are aligned or parallel to each other. One

corresponding angle of deflection b is therefore 0 °. The main boom extension 1 is tiltable to the main boom 2 about a luffing axis w, which is formed by a lower roll head axis. The main boom extension 1 is in this

Starting position of a bottom 3 with first to third floor levels 3a to 3c spaced and is thus from the main boom 2 via the bolt connections in corresponding Verbolzungsstellen A, B, C and D (see Figure 2) on the

Main boom head 2a carried.

Such main boom extensions 1 are basically constructed as modular systems of individual main elements and can be assembled according to the requirements of their length or load capacity. The single ones

Main elements have transportable dimensions and are not carried along with the telescopic crane in most cases, but are transported separately. If the axle loads of the telescopic crane and the size of the

Main boom extension 1 allow, if necessary, the

Main boom extension 1 are carried. This would then be in a transport position laterally next to and parallel to the main boom 2. A connection of the individual main elements to each other to the desired

Main boom extension 1 via bolt connections. The attachment to the main boom head 2a can be made as a whole element or as a preassembled unit or units.

FIG. 2 shows a detailed view of FIG. 1 from the area of the coupling of the main boom extension 1 to the main boom 2. The main boom extension 1, which has a rectangular cross section in the usual way, is arranged over four in the corner regions of the main boom extension 4

Bolt connections to bolting points A, B, C and D are attached to the main boom 2. The lower right bolt connection at the bolting point C is concealed by the main boom 2, but identical to the bolted connection at the

Verbolzungstelle D trained. Each of the four bolt connections is designed as a so-called two-pin bolt connection, which is constructed in a corresponding manner substantially from a forked tongue 4a, a tab 4b and a bolt 4c. The fork lug 4 a with its two opposite holes for the bolt 4 c is in each case in the four Verbolzungsstellen A to D at a foot 1 c of the main boom extension 1 and in extension of the

Main boom extension 1 attached. Here are the holes in the

Fork lug 4a vertically aligned with horizontal main boom extension 1. The tab 4b is fixed to the main boom head 2a via an axle 4d. The axis 4d is horizontally and transversely to the longitudinal direction of the main boom 2 aligned and rotatable in the horizontally oriented main boom head 2a Main boom head 2a stored. Correspondingly, in each case the tab 4b is also rotatable about the horizontal axis 4d. Also, the tab 4b has a bore which is aligned with the holes of the fork tab 4a. In the holes of the tab 4b and the fork lug 4a, a bolt 4c is inserted to fix the main boom extension 1 to the main boom head 2a in a corresponding manner.

In order to be able to angle the main boom extension 1 relative to the main boom head 2a or main boom 2, it is provided to pull the two upper bolts 4c at the bolting points A and B in the region of a top belt 1d of the main boom extension 1, so that the main boom extension 1 relative to the main boom 2 around the lower axis 4d in the region of the lower bolting points C and D in the region of a lower belt 1 e of

Main boom extension 1 can be turned by the angle of deflection b. The lower axis 4d thus forms the rocking axis w. Instead of the axis 4d could also serve the bolt 4c, if they were aligned horizontally. The angle of deflection b is usually in the range of 0 ° to 40 °. In order to be able to limit the angle of deflection b or to adjust it to the usual values of 20 ° and 40 ° angle of deflection, two so-called angled lugs 5 are provided, of which one is designed as an active combination angle lug 6. The Abwinkellasche 5 and the combination Abwinkellasche 6 extend in the region of the longitudinal sides of the upper belt 1 d of the main boom extension 1 and parallel to each other.

The passive Abwinkellasche 5, on the manual over a stop surface 5a a displacement and thus the Abwinkelwinkel b is limited, consists in

Essentially from a sliding tab 5b with a slot-shaped

Guide opening 5c, on which a guide plate 5d in the longitudinal direction c along a sliding latch 5b can be guided. The sliding lug 5b is formed as an elongated flat profile with the stop opening 5c and extends substantially parallel to the longitudinal direction v of the main boom extension. 1 At an end facing the main boom head 2a, the sliding lug 5b has a bore, via which the sliding lug 5b is connected to a bolt 5e on the main boom head 2a on the

Verbolzungsstelle E is releasably attached. The bolt 5e is with his

Longitudinal direction aligned parallel to the axis 4d. On the sliding tab 5b, the guide plate 5d is pushed, which for this purpose has a closed rectangular cross-section with a guide opening 5f (see Figure 5), in which the Sliding tab 5b inserted and is guided displaceably. The guide plate 5d per se is at one of the main boom head 2a facing the end of a further pin 5i in a Verbolzungstelle G to the basic boom 1 a of

Main boom extension 1 detachably attached. The bolt 5i is with his

Longitudinal direction aligned parallel to the axis 4d. Also, the pin 5i is passed through the stopper opening 5c of the sliding tab 5b. To one

Movement of the guide plate 5d to delimit on the sliding tab 5b, two continuous and in the longitudinal direction of the guide plate 5d spaced apart stop holes 5g in the side parts of the guide plate 5d are arranged. A first of the two stop holes 5g serves to limit the angle of deflection b to 20 ° and a second to 40 °. The stopper holes 5g for 40 ° are correspondingly located closer to the main boom head 2a to allow a larger displacement. Depending on the desired Abwinkelwinkel b 5g a stop pin is inserted into the respective stop hole 5g, which then passes through the two opposite stop holes 5g and the intermediate stop opening 5c. In the figure 2, the stop pin 5h is inserted into the second of the two stop holes 5g, which limits the angle of deflection b to 40 °. The stopper bolt 5h is guided adjacent to the pin 5i in the stopper opening 5c. The bolt 5i would come into contact only with the opposing abutment surface 5a of the stopper opening 5c when no stopper bolt 5h is inserted. The second of the two stop holes 5g is free.

The active combi Abwinkellasche 6 is similar to the structure of the manual part with the above-described passive Abwinkellasche 5 and has a stop surface 6a, a sliding plate 6b, a stop opening 6c, a guide plate 6d, a bolt 6e, a guide opening 6f, a corresponding manner

Stop hole 6g, a stop pin 5h corresponding stop pin 6h, which is also referred to as a bolt 6p, and a bolt 6i on. Of the

Stop bolt 6h and the bolt 6p are the same in the embodiment and provided only with respect to their Einsteckort with different terms and reference numerals. It is also possible to provide two bolts side by side, but the function of the active combi angled lug 6 does not provide for the simultaneous use of stop bolts 6h and bolts 6p, so that only one bolt can be provided for this purpose. The bolt 6e is in a Verbolzungsstelle F at the

Main jib head 2a releasably secured and the bolt 6i at a Verbolzungsstelle H. The stop pin 6h is not plugged in the basic position with the angle of deflection b of 0 °.

Compared to the passive Abwinkellasche 5, the active combination Abwinkellasche 6 is supplemented by a drive 6j to actively the guide plate 6d relative to the

Slide slide 6b to move. For this purpose, the sliding lug 6d is provided at its end opposite the main boom head 2a with a connection angle 6m at which the angle drive 6j of two parallel hydraulic cylinders with housings 6k and rod 61 are connected on the housing side. The hydraulic cylinders extend in the longitudinal direction of the Abwinkellasche. 5

or combi Abwinkellasche 6. To the Abwinkelantrieb 6j

or to connect the mutually parallel hydraulic cylinder with its rods 61 with the sliding tab 6b of the combination Abwinkellasche 6, compared to the passive Abwinkellasche 5, the sliding plate 6b with a

Bar member 6n extended to form a repository for the Abwinkelantrieb 6j. At the end of the rod part 6n opposite the main boom head 2a, a bore 6o (see FIG. 3) is arranged to fasten, via another bolt 6p, a coupling part 6q to which the rods 61 of the hydraulic cylinders

or Abwinkelantriebe 6j are stored. The hydraulic cylinders can be connected, for example, to existing hydraulic circuits. Basically, this is the hydraulic circuit of a Beiziehzylinders for horizontal

Swiveling a entrained main boom extension from one

Transport position out. The Abwinkelantrieb 6j is dimensioned so that only the weight of the

Main boom extension 1 can be angled or angled.

It can be seen that the coupling part 6q has a total of three holes to receive the bolt 6p and the ends of the rods 61 of the Abwinkelantriebs 6j and thus the force between the sliding tab 6b and to deflect the guide tab 6d. In addition, the stop pin 6h is shown in FIG.

FIG. 4 a shows a detailed view of a combi-angled lug 6 in the position according to FIG. 1. It can be seen that the Abwinkelantrieb 6j extended is, ie, the rod 61 is about a Ausfahrweg d from the housing 6k

moved out. This extension d corresponds to that shown in FIG

Starting position between main boom extension 1 and main boom 2. The angle drive 6j can be further extended to reduce the distance between the bolting points G, H and E, F. This leads to a

Relief of the upper pin 4c at the Verbolzungsstellen A, B. In addition, the Abwinkelantrieb 6j is coupled to the sliding tab 6b, since the pin 6p is inserted.

4b shows a side view of Figure 4a with the drawn

Extension d.

FIG. 5 shows a sectional view of FIG. 4b along the section line B-B. It can be seen that the guide tab 6d is rectangular

Cross-section having a central guide opening 6f, in which the sliding tab 6b is guided with its stop opening 6c.

In the following, a deviation of the main boom extension 1 located in the basic position according to FIG. 1 into a 40 ° position will be explained with reference to FIGS. 1 to 9, in particular FIGS. 6 to 9. In a first step, the

Abwinkellasche 5 and the combination Abwinkellasche 6 in the Verbolzungsstellen E and F via the bolts 5e and 6e attached to the main boom head 2a. Then the Abwinkelantrieb 6j is actuated and the rods 61 of the hydraulic cylinder extended so far that the sliding plate 6b is pulled relative to the guide plate 6d via the coupling part 6q in the direction of the main boom extension 1, so that the distance between the Verbolzungsstellen G, H and E, F reduces and the main boom extension 1 about the arranged in the region of the lower chord 1 d axes 4 d of the Verbolzungsstellen C, D slightly upwards. As a result, the main boom extension 1 is slightly raised, so that the upper pin 4c on the upper flange 1 d of the main boom extension 1 in the Verbolzungsstellen A, B are relieved. The now relieved bolts 4c are then removed. The main boom extension 1 is now based on the two lower pin 4c in combination with the combination Abwinkellasche 6 on the main boom 2 from. The two lower pins 4c and the axis 4d, which is also a lower

Rollenkopfachse is thus forming the rocking w for the Abwinkein the

Main boom extension 1. In a next step, the Abwinkelantrieb 6j is operated again and the rods 61 of the hydraulic cylinders retracted slowly. This will be the

Sliding tab 6b relative to the guide plate 6d via the coupling part 6q in

Direction of the main boom 2 pushed so that the distance between the Verbolzungsstellen G, H and E, F increases and the main boom extension 1 pivots about the arranged in the region of the lower chord 1 d axis 4 d of the Verbolzungsstellen C, D by the Abwinkelwinkel b. By this Abwinkelbewegung the head 1 f of the main boom extension 1 lowers in the direction of the bottom 3 until it touches the bottom 3. The Abwinkelantrieb 6j is now retracted a little further, whereby the bolt 6p relieved in the bore 6o and then plugged as a stop pin 6h in the stop hole 6g. This has the advantage that it is not forgotten during the set-up process to decouple the Abwinkelantrieb 6j and lifting this load is no longer involved in the main power flow. Also, the desired maximum displacement is now set before or at the latest now also at the Abwinkellasche 5 to allow or limit the bending of the main boom extension 1 in the 20 ° - or 40 ° -position. In the figure 6, which shows the main boom extension 1 of Figure 1 in a 15 ° position, the previously described position is shown, in which the lowered head 1f is supported on the bottom 3. The rocking angle a of the main boom 2 is still 0 °. FIG. 7a shows a detailed view of the combination bent-off angle pocket 6 in the 15 ° position according to FIG. 6. It is shown that the rods 61 of the hydraulic cylinder are completely retracted and the coupling part 6q continues to contact the rod part 6n of the sliding tab via the bolt 6p 6b is connected. Now, as the tip 1f rests on the bottom 3, the bolt 6p is pulled, thus releasing the bending drive 6j from the combination bending-back pocket 6, which thus also becomes a passive bending-off pocket.

FIG. 7b shows a side view of FIG. 7a. In a further step, by a Aufwippen the main boom 2 to the Wippwinkel a the main boom extension 1 further angled and the tip 1f of the main boom extension 1 slides hereby over the bottom 3 in the direction of the main boom 2. By Aufwippen the main boom extension 1 is further angled until the Abwinkellasche 5 and the combination Abwinkellasche 6 the Abwinkein in a limit selected position. At the time of

Limiting the Abwinkelbewegung in the 40 ° position by the Abwinkellasche 5 and the combination Abwinkellasche 6, the tip 1f just in contact with the ground 3. In a further Auflippen of the main boom 2 then raises the

Main boom extension 1 from floor 3 in the 40 ° position. This position, in which the main boom extension 1 to the main boom 2 is in a 40 ° position, is shown in FIG. For reasons of clarity, the tip 1 b of the main boom extension 1 is not shown there.

FIG. 9 a shows a detail view of a combination bent-off angle pocket 6 in the position according to FIG. 8. The stopper bolt 6h is in the stopper hole 6g, which faces the main boom head 2a, inserted so as to be the maximum

Move possibility of the guide tab 6d to limit the sliding tab 6b. The stopper bolt 6h abuts the stopper surface 6a at the end of the stopper opening 6c. Since the stopper bolt 6h is inserted into the stopper hole 6g closer to the main boom head 2a, the angle of angling b is limited to 40 °. In addition, the Abwinkelantrieb 6j is further decoupled, since the pin 6p is not plugged.

FIG. 9b shows a side view of FIG. 9a.

A backward or upright of the main boom extension 1 takes place in the reverse order.

FIG. 10 shows an exploded view of a combination bending-off pocket 6 in an alternative embodiment, which is presently preferred. The active combination Abwinkellasche 6 is comparable to the construction with the above-described active combination Abwinkellasche 6 and has a corresponding manner

Sliding tab 6b, a guide plate 6d and a Abwinkelantrieb 6j on. The main difference of this alternative sliding tab 6b over the previously described sliding tab 6b is that this sliding tab 6b is not flat profile over its entire length, but at least in the region of the stop opening 6c and the bore 6o of two parallel and spaced running flat profile sliding shackle parts 6b ', 6b "is formed to intervene between The sliding lug 6b also has a bore 6o adjacent to the stop opening 6c in the region of its center in order to releasably connect the rod 61 of the bending drive 6j to the sliding lug 6b via the bolt 6p Stop pin 6a 'for the stop pin 6h or pin 6p in the 20 ° position The other pin shown in Figure 10 without reference numeral is without function.The associated hole can be used to store currently not used bolts.

The guide tab 6d according to FIG. 10 is comparable to the one described above, the guide opening 6f being correspondingly wider in order to accommodate the wider sliding tab 6b. Instead of two stop holes 6g in the guide plate 6d only one slot-shaped stop opening 6g 'is present. In order to achieve the desired bending of the main boom extension in 20 ° and 40 ° position, not only a stopper opening 6c, but the additional hole 6o in the sliding plate 6b. The illustrated bolt 6p, 6h can be used either to connect the Abwinkelantriebs 6j to the sliding tab 6b or limiting the displacement of the guide plate 6d along the sliding tab 6b. Also in the figure 10, the Abwinkelantrieb 6j in the form of a single

Hydraulic cylinder with housing 6k and rod 61 shown. At the free end of the rod 61, the hydraulic cylinder via the bolt 6p when needed with the bore 6o of the sliding plate 6b connectable. At the opposite end, the housing 6k of the hydraulic cylinder together with the guide tab 6d in

Anchor point H on a tab of the foot 1 c of the main boom extension 1 connected to the pin 6i. Compared to the illustration in Figure 2, the tab will be located further away from the main boom head 2a, since the force flow through the combination Abwinkellasche 6 according to Figure 10 differs from that of the combination Abwinkellasche 6 in Figure 2. 1 a shows a detailed view of a combined combination bending angle pocket 6 according to FIG. 10. It can be seen that the bending drive 6j is arranged in the sliding lug 6b between the two sliding lug parts 6b 'and 6b ". are guided accordingly in the guide opening 6f of the guide plate 6d. According to the nested design is on the coupled Abwinkelantrieb 6j or decoupled Abwinkelantrieb 6 on the weight of the

Main boom extension 1, the sliding plate 6b relative to the guide plate 6d displaceable.

FIG. 11b shows a side view of FIG. 11a.

Although in the context of the present embodiment of the

Main boom 2 is described as a telescopic boom and the main boom extension 1 as a lattice boom with box top, the invention is also applicable to other embodiments of main boom 2 and main boom extension 1. The main boom 2 may also be a lattice boom or a combination of telescopic boom, lattice boom and / or box boom. For the main boom extension 1 are lattice boom or

Box boom or combinations thereof conceivable.

Furthermore, the embodiment is the use of a Abwinkellasche

5 and a combi Abwinkellasche 6 related. It is also possible instead of a Abwinkellasche 5 and a combination Abwinkellasche 6 two each arranged in the edge region of the upper belt 1 d of the main boom extension 1 combination Abwinkellaschen

6 provide. This embodiment with two combination Abwinkellaschen 6 without a Abwinkellasche 5 is preferred. Also, the use of a single and centrally relative to the width of the upper belt 1 d of the main boom extension 1 arranged combi Abwinkellasche 6 is conceivable. Furthermore, the combination Abwinkellasche 6 has been described as a pull rod. A design as a push bar also works and an arrangement in the lower flange area. It is also conceivable that then the rocking axis w is arranged in the region of the upper flange 1 d. The foot 1 c of

Main boom extension 1 is chamfered accordingly, preferably in the form of an adapter, to allow a deviation of the main boom extension 1 about the upper luffing axis w. LIST OF REFERENCE NUMBERS

1 main boom extension

1 a basic boom

1 b tip

c foot

1 d upper belt

1 e lower flange

1f head

2 main booms

2a main boom head

2b basic box

2c telescopic shots

3 floor

3a first floor level

3b second floor level

3c third floor level

4a fork strap

4b tab

4c bolt

4d axis

5 Abwinkellasche

5a stop surface

5b sliding latch

5c stop opening

5d guide strap

5e bolts

5f guide opening

5g stop hole

5h stop bolt

5i bolt

6 combi Abwinkellasche 6a, 6a 'stop surface 6b sliding latch

6b 'first sliding tab part 6b "second sliding lug part

6c stop opening

6d guide strap

6e bolts

6f guide opening

6g stop hole

6g 'stop opening

6h stop bolt

6i bolts

6j Abwinkelantrieb

6k case

61 pole

6m connection angle

6n rod part

6o hole

6p bolt

6q coupling part

6r connection hole

7 rocker cylinders

8 uppercarriage

A bolting point

B bolting point

C bolting point

D bolting point

E bolting point

F bolting point

G Verbolzungsstelle

H bolting point a Wippwinkel

b angle of attack

c longitudinal direction of the Abwinkellasche d extension path

h longitudinal direction of the main boom v Longitudinal direction of main boom extension w Rocker axle

Claims

claims

1 . Mobile crane with a rocker mounted thereon and about a luffing cylinder (7) erectable main boom (2) and with a releasably connected to a main boom head (2a) of the main boom (2) via upper and lower bolts (4c)

Main boom extension (1), the main boom extension (1) starting from a home position after a release of the upper or lower bolts (4c) by means of a Abwinkelantriebs (6j) about a rocking axis (w) relative to the

Main boom (1) is angled, the Abwinkelantrieb on a foot (1 c) of the main boom extension (1) engages a maximum angle of deflection (b) by an adjustable Abwinkellasche (5) is limited and the Abwinkellasche (5) on the foot (1 c ) of the main boom extension (1) and the main boom head (2a) engages, characterized in that the Abwinkelantrieb (6j) is part of a

Abwinkellasche (5) in the form of a combination Abwinkellasche (6).

2. Mobile crane according to claim 1, characterized in that the Abwinkelantrieb (6j) on the one hand to the main boom head (2a) and on the other hand on the

Main boom extension (1) attacks.

3. Mobile crane according to claim 1 or 2, characterized in that starting from a basic position after a release of the upper bolt (4 c) the

Main boom extension (1) by means of the Abwinkelantriebs (6j) about a rocking axis (w) in the region of a lower chord (1 e) of the main boom extension (1) is bendable and the Abwinkelantrieb (6j) in the region of the upper chord (1 d) of

Main boom extension (1) attacks.

4. Mobile crane according to one of claims 1 to 3, characterized in that the Abwinkelantrieb (6j) is designed such that the main boom extension (1) against the force of gravity of the main boom extension (1) to the

Wippachse (w) is pivotally raised and lowered.

5. Mobile crane according to one of claims 1 to 4, characterized in that the rocking axis (w) in the region of the lower bolt (4c) is formed.

6. Mobile crane according to one of claims 1 to 5, characterized in that the Abwinkelantrieb (6j) as a hydraulic cylinder with housing (6k) and rod (61) is formed.

7. Mobile crane according to one of claims 1 to 6, characterized in that the combination Abwinkellasche (6) consists of a sliding tab (6b), a guide tab (6d) and the Abwinkelantrieb (6j), the Abwinkelantrieb (6j) drivingly on the one hand the sliding lug (6b) and on the other hand on the guide tab (6d) engages and on the Abwinkelantrieb (6j), the sliding lug (6b) relative to the guide plate (6d) is displaceable.

8. Mobile crane according to claim 7, characterized in that the Abwinkelantrieb (6j) is releasably attached to the sliding latch (6b).

9. Mobile crane according to claim 7 or 8, characterized in that the

Sliding tab (6b) is pivotally mounted on the main boom head (2a), the guide plate (6d) is pivotally mounted on the main boom extension (4), the sliding tab (6b) in the guide tab (6d) is guided and a

Stop bolt (6h) a maximum displacement of the sliding lug (6b) in the guide plate (6d) can be limited.

10. A method for bending a main boom extension (1) relative to a main boom (2) of a mobile crane, in particular a mobile crane according to one of claims 1 to 9, wherein the main boom (2) stored rocking on the mobile crane and a luffing cylinder (7) erectable is, the main boom extension (1) releasably connected to a main boom head (2a) of the main boom (2) via upper and lower bolts (4c), a Abwinkelantrieb (6j) on a foot (1 c) of the main boom extension (1) attacks maximum angle of deflection (b) is limited by an adjustable Abwinkellasche (5) and the Abwinkellasche (5) on the foot (1 c) of the main boom extension (1) and the main boom head (2a) engages, characterized in that by means of Abwinkelantriebs (6j) , which is part of a Abwinkellasche (5) in the form of a combination Abwinkellasche (6), the

Main boom extension (1) starting from a basic position by one

Rocking axis (w) is raised relative to the main boom (2), as far as the upper or lower bolts (4c) are relieved, then the upper or lower bolts (4c) are removed, between the main boom head (2a) and a Upper belt (1 d) and lower belt (1 e) of the main boom extension (1) at least one combination Abwinkellasche (6) is used or is already used by the Abwinkelantriebs (6j), the main boom extension (4) is lowered until the maximum Abwinkelstellung or a head (1f) of the main boom extension (1) on a floor (3) comes to rest, the Abwinkelantrieb (6j) is drivingly separated from the combination Abwinkellasche (6) and when the maximum Abwinkelstellung is not reached by means of

Erect the main boom (2) the main boom extension (1) until the

Achieving the desired angle of deflection (b) is angled.

1 1. A method according to claim 10, characterized in that the

Main boom extension (1) starting from a basic position by one

Rocking axis (w) is raised relative to the main boom (2), as far as the upper bolts (4c) are relieved, then the upper bolts (4c) are removed, between the main boom head (2a) and a top flange (1 d)

Main boom extension (1) at least one combination Abwinkellasche (6) is used or is already used.