Support for the rear anchoring line of a telescopic crane

Abstract

A vehicle crane, such as a mobile crane, includes a main jib and a main jib extension that is mounted thereon and can be luffed by at least one luffing cable. The vehicle crane includes at least one anchoring support that is arranged on the main jib and guides the luffing cable in order to anchor the main jib to provided improved load-bearing capacity.

Claims

1. A vehicle crane comprising: a main jib and a main jib extension mounted thereon and being luffable by at least one luffing cable, wherein the main jib is configured as a telescoping jib with a jib basic box and a plurality of telescoping sections and wherein the main jib is mounted on a superstructure of the vehicle crane in such a manner as to be able to be raised; wherein the luffing cable, starting from a winch on the vehicle crane, is guided by at least one guying support and at least one luffing support in the region of a main jib head and is fastened at that location; and wherein the winch is disposed in a rear region of the superstructure, the at least one guying support is disposed on the main jib between the jib basic box and the innermost telescoping section and deflects the luffing cable in order to guy the main jib and alternatively the luffing cable is guided by the luffing support further as far as the main jib extension and is fastened at that location.

2. The vehicle crane as claimed in claim 1, wherein the at least one guying support is disposed on the main jib in the region of the middle three, middle two, or the middle one of the telescoping sections.

3. The vehicle crane as claimed in claim 1, wherein a deflection roller is mounted on a free end of the guying support, with the luffing cable being guided over the deflection roller.

4. The vehicle crane as claimed in claim 1, wherein at least a part of the luffing cable is replaced by guying rods, belts, chains or other flexible component with a high level of tensile strength.

5. The vehicle crane as claimed in claim 1, wherein the guying support is disposed so as to be pivotable about a horizontal axis on the main jib and the guying support can be raised from an inoperative position into an operating position.

6. The vehicle crane as claimed in claim 5, wherein the main jib is designed as a telescoping jib and the guying support can be raised by an extension movement of the telescoping jib out of the inoperative position into the operating position.

7. The vehicle crane as claimed in claim 6, wherein the guying support is disposed on a head of the telescoping section of the telescoping jib.

8. The vehicle crane as claimed in claim 6, wherein the guying support can be raised by a raising cable that engages at the end of the guying support by a bracket on the guying support and is connected to a head of a telescoping section above the guying support.

9. The vehicle crane as claimed in claim 6, wherein a safety cable defines maximum raising of the guying support and the safety cable engages at the end of the guying support and is connected to a head of a telescoping section below the guying support.

10. The vehicle crane as claimed in claim 6, wherein a plurality of guying supports are disposed on different heads of telescoping sections of the telescoping jib.

11. The vehicle crane as claimed in claim 6, wherein a safety cable defines maximum raising of the guying support and the safety cable engages at the end of the guying support and is connected to a head of a telescoping section below the guying support.

12. The vehicle crane as claimed in claim 1, wherein the guying support in the operating position forms an angle with respect to the main jib in the range of 75 to 90 degrees.

13. The vehicle crane as claimed in claim 1, wherein the length of the guying support is variably adjustable.

14. A vehicle crane comprising: a main jib and a main jib extension mounted thereon and being luffable by at least one luffing cable, wherein the main jib is configured as a telescoping jib with a jib basic box and a plurality of telescoping sections and wherein the main jib is mounted on a superstructure of the vehicle crane in such a manner as to be able to be raised; wherein the luffing cable, starting from a winch on the vehicle crane, is guided by at least one guying support and at least one luffing support in the region of a main jib head and is fastened at that location; wherein the winch is disposed in a rear region of the superstructure, the at least one guying support is disposed on the main jib between the jib basic box and the innermost telescoping section and deflects the luffing cable in order to guy the main jib and alternatively the luffing cable is guided by the luffing support further as far as the main jib extension and is fastened at that location; and wherein the at least one guying support is disposed on the main jib in the region of a middle one of the telescoping sections.

15. The vehicle crane as claimed in claim 14, wherein a deflection roller is mounted on a free end of the guying support, with the luffing cable being guided over the deflection roller.

16. The vehicle crane as claimed in claim 14, wherein the guying support is disposed so as to be pivotable about a horizontal axis on the main jib and the guying support can be raised from an inoperative position into an operating position.

17. The vehicle crane as claimed in claim 14, wherein the guying support in the operating position forms an angle with respect to the main jib in the range of 75 to 90 degrees.

18. The vehicle crane as claimed in claim 17, wherein the main jib is designed as a telescoping jib and the guying support can be raised by an extension movement of the telescoping jib out of the inoperative position into the operating position.

19. The vehicle crane as claimed in claim 17, wherein the at least one guying support is disposed on a head of the telescoping section of the telescoping jib, or wherein the at least one guying support comprises a plurality of guying supports and wherein the plurality of guying supports are disposed on different heads of telescoping sections of the telescoping jib.

20. The vehicle crane as claimed in claim 17, wherein the guying support can be raised by a raising cable that engages at the end of the guying support by a bracket on the guying support and is connected to a head of a telescoping section above the guying support.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic side view of a vehicle crane with a main jib and a luffable main jib extension;

(2) FIG. 2a shows a partial view of the vehicle crane according to FIG. 1 from the region of the main jib with a guying support in the inoperative position;

(3) FIG. 2b shows a partial view according to FIG. 2a with a guying support in an intermediate position; and

(4) FIG. 2c shows a partial view according to FIG. 2a with a guying support in an operating position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) FIG. 1 is a schematic side view of a vehicle crane 1, in particular of a mobile crane, with a lower carriage 2 and a superstructure 3. The lower carriage 2 comprises a driver's cabin 4 and six axles 5 each with two rubber-tyred wheels 6 suitable for road travel. The lower carriage 2 can naturally comprise more or less than six vehicle axles 5 or alternatively comprise a crawler track. The superstructure 3 is mounted on the lower carriage 2 in such a manner as to be pivotable about a vertically orientated axis of rotation D. The superstructure 3 and lower carriage 2 can alternatively also be rigidly mounted one on another. A main jib 7 is disposed on the superstructure 3 which can pivot about the horizontal axis D, this main jib being designed as a telescoping jib. The main jib 7 comprises a jib basic box 7a and a plurality of telescoping sections 7b to 7f which are disposed one inside another and can telescope out. The jib basic box 7a is mounted on the superstructure 3 so that it can be raised by means of a luffing cylinder 8, whereby the main jib 7, after complete retraction of the telescoping sections 7b to 7f into the jib basic box 7a can be laid onto the lower carriage 2 for road transport.

(6) Furthermore, at an upper end of the fifth telescoping section 7f, and therefore on a main jib head 7g, a luffable main jib extension 8, designed as a lattice mast girder, is pivotably attached and can be raised relative to the main jib 7 about a horizontal luffing axis W. In a conventional manner, the luffing axis W is orientated orthogonally to the longitudinal axis of the main jib 7. In a conventional manner, at least one luffing cable 9 is provided for the luffing process of the main jib extension 8, this cable extending from a winch, not illustrated, which is disposed in the rear region of the superstructure 3, to a first luffing support 10a and is fastened at that location. Further along, the function of the luffing cable 9 is taken over by guying rods 16, which in a corresponding manner are fastened between the first luffing support 10a and a second luffing support 10b and between the second luffing support 10b and approximately the middle of the main jib extension 8. The first luffing support 10a and the second luffing support 10b are mounted in a conventional manner in the region of the main jib head 7g in an articulated manner about horizontal axes and extend backwards in relation to the main jib 7 and in a V shape with respect to each other.

(7) This at least one luffing cable 9 is additionally guyed by means of a further guying support 11 in accordance with the invention in the region of the main jib 7. In the present case, the guying support 11 is disposed approximately in the middle of the main jib 7 so as to be pivotable about a horizontal axis A and therefore in an articulated manner. The guying support 11 can fundamentally be disposed between the articulation of the luffing cylinder 8 on the main jib 7 and the main jib head 7g. In terms of relieving the load on the main jib 7 a middle region will certainly ultimately result when considered statically. In addition to the illustrated single guying support 11, two or more guying supports 11 can also be disposed spaced apart along the rear side of the main jib 7.

(8) In addition, a further auxiliary guying support 12a is fastened to the head or the upper end of the jib basic box 7a and likewise extends from the jib basic box 7a approximately at a right angle backwards. This auxiliary guying support 12a is a component of a main jib guying arrangement which comprises an auxiliary guying cable 12b. The guying cable 12b is guided from a foot of the jib basic box 7a by means of the auxiliary guying support 12a to the main jib head 7g. The auxiliary guying support 12a can also be designed as a pair of guying supports disposed in a horizontal plane and in a V shape next to, and with respect to, each other. This additional auxiliary guying arrangement 12a, 12b serves to brace the main jib 7.

(9) FIGS. 2a to 2c each show a partial view of the main jib 7 of the vehicle crane 1 according to FIG. 1, wherein the guying support 11 is illustrated in each case in one of three positions. The main jib extension 8 has been omitted in order to improve illustration of the guying support 11. Since FIG. 1 is largely identical to FIGS. 2a to 2c, the following paragraphs will relate only to the differences between the individual figures in the region of the guying support 11.

(10) FIG. 2a shows the second guying support 15 in a folded-down inoperative position or transport position almost lying on the main jib 7 and not raised on the main jib 8. The telescoping sections 7b, 7c, 7e and 7f are fully or greatly extended and the third telescoping section 7d only partially so (about 10%). The third telescoping section 7d is telescoped out only far enough for a raising cable 14 to be tensioned, for the guying support 11 to move from the inoperative position lying against the main jib 7 but not yet to move away. The raising cable 14 is fastened at one end to an upper end of the third telescoping section 7d and at the other end to the guying support 11 in the region of its free end 11 a at a bracket 11b, in particular a front end bracket. In order to be able to introduce raising forces more effectively into the guying support 11, the bracket 11b is disposed at a right angle on the guying support 11 and protruding backwards, the raising cable 14 engaging at the free end thereof. Furthermore, FIG. 2a shows that the free end 11a of the guying support 11 supports a deflection roller 11c in a rotatably mounted manner, which deflection roller is in engagement with the luffing cable 9 in the operating position (see FIG. 2c). The raising cable 19 can naturally also be fastened to a head of another telescoping section 7e or 7f.

(11) A safety cable 15 hangs down without tension between the free end 11a of the guying support 11, the second guying support 15 and the head of the first telescoping section 7a. The safety cable 15 can naturally also be mounted on the head of another telescoping section 7b to 7f—depending on the installation site of the guying support 11—on the head of the jib basic box 7a or on the superstructure 3. The function of the safety cable 15 is to prevent the guying support 11 flipping upwards. In the inoperative position shown in this case, there is no contact between the deflection roller 11c and the luffing cable 9. The luffing cable 9 therefore passes from the superstructure 3 to the first luffing support 10 without being deflected.

(12) In FIG. 2b, which shows a further partial view of FIG. 1, the guying support 11 is in an intermediate position, i.e. between the inoperative position and an operating position. The telescoping sections 7b and 7f of the main jib 8 are fully extended, the second telescoping section 7c is about 90% extended, the third telescoping section 7d is about 20% extended and the fourth telescoping section 7e is about 45% extended. The third telescoping section 7d is telescoped out further than in FIG. 2a so that the raising cable 14 lifts or pulls up the guying support 11 out of its laid-down inoperative position and the deflection roller 11 comes into initial contact with the luffing cable 9 and passes into same. With the guying support 11 in this intermediate position, the safety cable 15 is still not tensioned. In FIG. 2b the luffing cable 9 is still not deflected by the deflection roller 11c. There is merely initial contact between the luffing cable 9 forming a guying arrangement and the deflection roller 11c.

(13) FIG. 2c shows a further partial view of FIG. 1 in which the guying support 11 is illustrated in the raised operating position. An angle between the guying support 11 and the second telescoping section 7c is between 75 and 90 degrees, preferably 80 degrees, so that under the action of the deflection force from the luffing cable 9 the guying support 11 automatically returns to the inoperative state for transportation even as telescoping section 7d is telescoping in. The telescoping sections 7b and 7c of the main jib 8 are about 90% extended and the telescoping sections 7d to 7f are about 45% extended. Owing to the fact that the second and third telescoping sections 7c, 7d are each not fully extended, the tension in the raising cable 14 and the safety cable 15 can be adjusted. The guying support 11 engages the luffing cable 9 with its deflection roller 11c and deflects the luffing cable 9 via the deflection roller 11c. In this operating position of the guying support 11, the main jib 7 is additionally guyed or stabilised with respect to auxiliary guying arrangement 12a, 12b. A deformation of the main jib 7 in the load picking-up direction and severe curving of the main jib 7 can hereby be reduced.

(14) In the present exemplified embodiment, the invention is described with the aid of a mobile crane with a telescoping jib. It is obvious that the principle of the present invention can also be applied to lattice mast jibs or folding jibs (foldable jibs of a lattice mast or box design) and also to crawler cranes. Alternatively, the guying support can be brought into the operating position by means of at least one hydraulic raising cylinder. In the case of this alternative, an angle of about 90 degrees between the main jib 7 and guying support 11 would be preferred.

(15) In conjunction with the present exemplified embodiment, it is also feasible that for the case where a vehicle crane 1 comprises a main jib 7 as a telescoping jib with a jib basic box 7a and a plurality of telescoping sections 7b to 7f, the at least one guying support 11 is disposed on the main jib 7 between the jib basic box 7a and the innermost telescoping section 7f. Preferably, the at least one guying support 11 should be disposed on the main jib 7 in the region of the middle three (in the case where the jib basic box 7a and the telescoping sections 7b to 7f make up an odd number in total), preferably two (in the case where the jib basic box 7a and the telescoping sections 7b to 7f make up an even number in total), particularly preferably of the one middle telescoping section 7c, 7d (in the case where the jib basic box 7a and the telescoping sections 7b to 7f make up an odd number in total).

(16) If the vehicle crane 1 with a main jib 7 as a telescoping jib is fitted with a jib basic box 7a and a plurality of telescoping sections 7b to 7f and the main jib 7 can be luffed by means of a luffing cylinder 13 articulated on the jib basic box 7a, the at least one guying support 11 is thus disposed on the main jib 7 between an articulation of the luffing cylinder 13 on the jib basic box 7a and the innermost telescoping section 7f.