EP1863692B1 - Drive device of a self-propelled ropeway carriage - Google Patents

Abstract

A driving system of a self-driving cableway car includes on both sides of a vertical plane (8), in which the bearing cable (6) is located, driving chains (9, 10) that revolve about chain sprocket wheels (13, 14) with horizontal rotational axes (15, 16) The driving chains carry clamping units (31) with friction linings (35) for contacting the bearing cable (1), and lead rails (36, 37) disposed on opposite sides of the bearing cable. The clamping units (31) are guided during the revolution of the driving chains (9, 10) through a particular interspace (38, 39) between the bearing cable (6) and one of the lead rails (36, 37), and the friction linings (35) of the clamping units (31) are pressed onto the bearing cable (6) by rollers (33) rolling out on running faces (40, 41). Also, a particular lead rail (36, 37) is preloaded by a spring device (46) against clamping units (31) located in the interspace (38, 39) between this lead rail (36, 37) and the bearing cable (6). The rollers (33) are rotatably supported on the clamping units (31). The lead rails (36, 37) have the running faces (40, 41) on which roll out the rollers (33) of the clamping units (31) for pressing the friction linings (35) of the clamping units (31) onto the bearing cable (6).

Description

The invention relates to a drive device of a self-propelled cable car, comprising on both sides of the vertical plane in which the support cable is to chain wheels with horizontal axes of rotation encircling drive chains having chain links connected by chain pins link plates and wear clamping units with friction linings to rest on the support cable, and on opposite sides arranged on the support cable Anstellschienen, wherein the clamping units are guided during rotation of the drive chains through a respective space between the support cable and one of the Anstellschienen and in this case the friction linings of the clamping units are pressed by rollers rolling on treads on the support cable, wherein the rollers rotatably mounted on the clamping units are and the Anstellschienen have the running surfaces on which the rollers of the clamping units to press the friction linings of the clamping units to the support cable.

Although there are a large number of proposals for the design of self-propelled aerial ropeways, these have so far only been suitable for practical applications, for example rescue vehicles. An economical application for permanent cable cars is so far not possible. For such not only a high gradeability and driving speed must be given, but it must also be a sufficient wear resistance. In addition, it is essential that the ratio of dead weight to payload is not too great. Gradeability is usually required to be at least 100%. For the driving speed, a value of at least 2 to 5 m / s is desired. With customary cable usage intensities, hundreds of operating hours and more per year are achieved and appropriate wear resistance must be available. Acceptable weight ratios between tare and net weight should be better than three, preferably better than two.

To achieve sufficiently large friction surfaces between the friction elements and the support rope crawler-type constructions are used for self-propelled aerial tramways. Here, elastically chucked friction elements are prescribed. To be able to apply sufficiently high forces for pressing the friction elements to the support cable, the rollers which roll on corresponding running surfaces and in this case press the friction elements to the support cable, hardened, as well as the running surfaces for the rollers.

In the AT 263 851 B is in addition to embodiments in which a single in a vertical plane rotating drive chain is present, also described an embodiment of a drive device of a self-propelled cable car of the type mentioned, in which both sides of the vertical plane in which the support cable is located, each with a drive chain to sprockets horizontal axes rotates. At the chain links clamping plates are arranged, which in each of the supporting cable adjacent portion of the drive chains through a respective space between a drive rail and the support cable be performed. On the clamping straps rollers are rotatably mounted with the interposition of springs, which roll on running surfaces of the Anstellschienen, wherein the springs are compressed and the clamping straps are pressed against the support cable. A disadvantage of this device is the complicated design of the attached to the drive chains clamping units. Each clamping unit requires a spring device, from which a sufficient contact force must be applied to the supporting cable and which is exposed to very high wear due to the continuous working movements with each revolution of the chain and therefore must be designed with appropriate effort. In addition to the increased design complexity, this leads in particular to a relatively high weight of the drive device and thus the entire cable car, whereby the efficiency of the device is significantly affected.

At the time of the CH 462 225 known drive device attached to the chain links clamp straps are loaded by spring stationary stationary rollers, as is common in crawler tracks. The spring-loaded rollers press the clamping straps against the carrying cable in the section of the chain which is in each case located in the region of the rollers. The spring-loaded rollers must pass over the gaps between the individual clamping straps. This continuous driving over of rail joints not only leads to a troubled run but also to a high degree of wear. It is achieved only a relatively short life, especially if the design effort and the weight should not be too high.

When setting up the CA 1096368 A are arranged on opposite sides of the supporting cable, lying in a common plane drive chains available. On the chain links clamping plates are mounted, which are pressed from above and below against the suspension cable. To pressurize the clamping plates, in turn, as is known from crawler tracks, a roller unit is provided, wherein the rollers are rotatably mounted in this case on separate chains, which rotate around a support within the area surrounded by the drive chains. To clamp the suspension cable between the opposing clamping plates, the carriers are pulled together by means of piston-cylinder units. In addition, a spring device for exerting a mutually directed bias of the two carriers is also available. The equipment cost of this device is still much higher than in the aforementioned constructions of AT 263 851 and CH 462 225 and the weight requirements for an economical operation of a self-propelled cable car, especially if this is to be used as a means of transport for people can not be met approximately. Also, the rollers acting on the clamping plates in turn overrun the joints between the clamping plates, which causes wear problems. Furthermore, in the area in which the clamping plates are pressed from above and from below to the support cable, no support rollers of the cable car on the support cable roll, so that a cable car would be feasible only with a very sweeping design.

In the DE 202 13 353 U1 known drive means are the rollers by means of which the friction linings are pressed by clamping units to the support cable, rotatably mounted on U-profiles. The running surfaces on which these rollers roll are arranged on the clamping units, which are supported by the chain links of the drive chains. In this case, the rollers are run over by the roles when circulating the drive chains, the shocks between the individual clamping units, which brings a troubled run and high wear with it. The U-profiles are acted upon by a spring device to press the clamping units by means of the rollers to the support cable.

From the DE 2 354 767 A1 goes out of a stationary drive device for a production line. The rope forming the conveyor line and the drive chains driving this are in a common plane in this device. On chain pins of the drive chains rollers are rotatably mounted, which roll on spring-loaded Anstellschienen to press friction linings of clamping units to the rope. The pressing of the clamping units thus takes place via the chain links, ie the clamping force is transmitted via the chain links.

The object of the invention is to provide an improved drive device of the type mentioned, with a sufficient Gradeability and driving speed can be achieved and this case has a high wear resistance and a relatively low weight. According to the invention, this is achieved by a drive device having the features of claim 1.

Essential features of the device according to the invention are in particular that the rollers are rotatably mounted on the clamping units and the Anstellschienen are spring-loaded. The required contact forces of the clamping units on the supporting cable are applied by the suspension device acting on the Anstellschienen. Therefore, no springs need to be present on the clamping units themselves, which must carry out continuous working movements with each revolution of the chain, whereby a significant weight saving is made possible. The rotatably mounted on the clamping units rollers run off at bum-free continuous running surfaces of Anstellschienen. The wear of these rollers and the running surfaces of the rails can thus be kept relatively small. The running surfaces of the rollers and the rails can be made hardened in this case.

In an advantageous embodiment of the invention engage the Anstellschienen each two or more spaced apart in the longitudinal direction of the rails brackets, said brackets are pairwise opposite each other and formed as a one-armed lever and between which spring-tension rods extend, pulling the brackets about their axes of rotation against each other.

The clamping units are inventively mounted slidably in the link plates of the chain links, wherein they protrude on both sides over the chain and a respective clamping unit window recesses in the two link plates of a chain link passes through. It is particularly preferred in this case that the window recesses of the two link plates of a body of the respective clamping unit to be interspersed. In this case, a very simple and expedient construction is achieved, whereby tilting moments between the drive chain and the friction linings pressed onto the carrying cable can also be minimized. Conveniently, the chain links connecting the chain pins and the friction linings of the clamping units and preferably also the rollers of the clamping units can lie in a common plane.

Fig. 1

eine vereinfachte, teilweise schematisierte Darstellung eines Ausführungsbeispiel der Erfindung, in Schrägsicht;

Fig. 2

eine Darstellung entsprechend Fig. 1, wobei Teile der Antriebseinrichtung zur Verdeutlichung der übrigen Elemente weggelassen worden sind;

Fig. 3

eine Schrägsicht der Anstellschienen, des Tragseils und von Abschnitten der dazwischenliegenden Kettenstränge der Antriebsketten, aus einer etwas geänderten Blickrichtung;

Fig. 4

eine Schrägsicht der Anstellschienen und der sie beaufschlagenden Federeinrichtung aus einer wiederum anderen Blickrichtung;

Fig. 5

einen vereinfachten Querschnitt durch eine der beiden mittleren Tragrollen,

Fig. 6

einen vergrößerten Ausschnitt A von Fig. 1, wobei die vordere Anstellschiene und ihre Federeinrichtung weggelassen sind.

Further advantages and details of the invention are explained below with reference to the accompanying drawings. In this show:

Fig. 1

a simplified, partially schematic representation of an embodiment of the invention, in oblique view;

Fig. 2

a representation accordingly Fig. 1 wherein parts of the drive means have been omitted to illustrate the remaining elements;

Fig. 3

an oblique view of Anstellschienen, the support cable and portions of the intervening chain strands of the drive chains, from a slightly different direction of view;

Fig. 4

an oblique view of Anstellschienen and acting on it spring device from a different direction of view;

Fig. 5

a simplified cross section through one of the two middle carrying rollers,

Fig. 6

an enlarged section A of Fig. 1 , wherein the front Anstellschiene and its spring means are omitted.

An embodiment of the invention is shown in FIGS. A support frame 1 comprises the longitudinal members 2, on which the two middle support rollers 3, 4 are rotatably mounted, and a longitudinal beam 2 connecting the cross member 5. The support rollers 3, 4 run on the support cable 6 from.

On the support frame 1 a hanger 7 is suspended from the in the Fig. 1 and 2 only an upper arm hingedly connected to the cross member is visible and which may in particular comprise a cable car cabin.

On both sides of the vertical plane 8 (see. Fig. 5 ), in which the support cable 6 is running drive chains 9, 10 in vertical planes 11, 12 to. The drive chains 9, 10 each run around first and second sprockets 13, 14, which in Fig. 2 only shown by dash-dotted lines. The drive chains 9, 10 are in the Fig. 1 and 2 only partially excellent and their remaining course is indicated by dash-dotted lines.

The two first sprockets 13 of the two drive chains 9, 10 are just like the two second sprockets 14 of the drive chains 9, 10 coaxial with each other (the axes of rotation 15,16 are in Fig. 2 shown). The two sprockets 13 of the respective drive chain 9, 10 are driven by a motor, not shown in the figures for the sake of simplicity, to move the self-propelled cable car. This drive of the sprockets 13 may be formed in a conventional manner. The two sprockets 14 are freely rotatably mounted.

Between the two first sprockets 13 as well as between the two second sprockets 14 additional support rollers 54, 55 are arranged, which roll on the support cable 6. The first sprockets 13 with the intermediate support roller 54 are preferably as well as the second sprockets 14 with the intermediate support roller 55 as rigidly interconnected units 17, 18 formed in Fig. 1 the sake of clarity are shown only schematically. These units 17, 18 are rotatably mounted on supports 19, 20 and 21, 22, which are pivotally mounted about pivot connections 23, 24 about a horizontal and perpendicular to the supporting cable 6 pivot axis.

On the carriers 19, 20 and 21, 22 attacking, only schematically illustrated springs 25, 26 act as tension and compression springs. When the supports 19, 20 and the supports 21, 22 are pivoted relative to each other from their parallel orientation, the springs 25, 26 cause a restoring force in the direction of this parallel orientation. Depending on the curvature of the support cable 6, there is a loading or unloading of the outer support rollers 54, 55, so that in each case a part of the weight of the cable car over the support rollers 54, 55 is derived on the support cable 6. The springs 25, 26 act in the embodiment shown in each case between two in opposite directions of the pivotal connections 23, 24 extending beams 19, 21 and 20, 22nd

In this way, a part of the weight of the cable car is transferred to the support cables 6 of the support rollers of the units 17, 18. The other part of the weight is transmitted to the support cable 6 by the intermediate support rollers 3, 4 lying between these outer support rollers. The unit comprising the pivotally interconnected supports 19 to 22, the springs 25, 26 acting therebetween, the sprockets 13, 14 and the support rollers 54, 55 disposed therebetween, and the drive chains 9, 10 revolving around the sprockets 13, 14 , Is mounted pivotally on the support frame 1 total. For this purpose, the carriers 19, 20 are rigidly connected via connecting pieces 56 to a cross member 57. The cross member 57 has on both sides connecting arms 58 which are hingedly connected to the cross member 5 attached to the connecting plates 59. This pivot axis 60 is horizontal and perpendicular to the support cable and in a plane in which the support cable 6 is located. Different slopes of the support cable 6 have thereby no influences on the wheel loads of the support rollers 54 and 55th

It would also be conceivable and possible to provide only support rollers that are independent of the chain drive. The formation of the support rollers and their storage could then be done in a conventional manner.

The drive chains 9,10 are formed as link chains. A respective chain link has two transversely spaced apart link plates 27, 28, which are connected to each other via chain pins 29. On the chain pin chain rollers 30 are arranged.

The drive chains 9,10 carry clamping units 31. In the illustrated embodiment, a clamping unit 31 is supported by each chain link, as is preferred.

A respective clamping unit 31 is slidably mounted in the two link plates 27, 28 of a respective chain link, in the direction perpendicular to the support cable 6. Here, the link plates window recesses, which are penetrated by the clamping units 31, wherein the clamping units 31 on both sides of a respective drive chain 9, 10 protrude from the link plates 27, 28.

The clamping units 31 each comprise a body 32 on which on the one hand a roller 33 is rotatably mounted and on the other hand, a lining carrier 34 is fixed, which receives a friction lining 35 and determines. The lining carrier 34 with the friction linings 35 are respectively attached to the protruding on the side of the support cable 6 from the link plates 28 portion of the body 32. The rollers 33 protrude on the side facing away from the support cable 6 on the respective link plate 27 and the front end of the body 32.

The friction lining 35 of a respective clamping unit 31 and the link plates 27, 28 of this clamping unit 31 overlapping chain link lie in a common plane. The roller 33 of the clamping unit is also in this plane. Preferably, this plane passes through the chain pins 29 connecting the link plates 27, 28.

The drive chains 9, 10 each lie with a section in a common plane, in which the support cable 6 is located. Anstellschienen 36, 37 are arranged in the region of these sections of the drive chains 9, 10, which also lie in the same plane. The Anstellschienen 36, 37 extend here on both sides at a distance from the support cable 6 parallel to this.

The respective sections of the drive chains 9, 10, which lie in a common plane, in which the support cable 6 is located, are guided through intermediate spaces 38, 39 between the support cable 6 and the respective Anstellschiene 36, 37. The slidably mounted in the link plates 27, 28 of the chain links clamping units 31 are thus guided by the drive chains 9,10 also through these spaces 38, 39. In this case, the rollers 33 come to rest on running surfaces 40, 41 of the positioning rails 36, 37 and roll along these running surfaces 40, 41. These running surfaces are thus arranged on the support cable 6 facing sides of the Anstellschienen 36, 37.

The running surfaces 40, 41 extend over the major part of their longitudinal extension parallel to the carrying cable 6. In the vicinity of their two longitudinal ends they have sections 42, 43 in which their distance from the carrying cable 6 to the respective free end 44, 45 of the adjusting rail 36, 37 enlarged. These sections are formed by inlet slopes of the Anstellschienen 36, 37.

The Anstellschienen 36, 37 are biased by a spring means 46 against each in the spaces 38, 39 between the Anstellschienen 36, 37 and the support cable 6 located clamping units 31, the rollers 33 roll on the running surfaces 40, 41. It is thereby applied the required clamping force with which the friction linings 35 are pressed from opposite sides to the support cable 6.

How this particular out Fig. 4 it can be seen, the spring device 46 comprises brackets connected to the Anstellschienen 36 47, 37 engage on the side facing away from the supporting cable 6 outer sides of the Anstellschienen 36, and with which springs 48 cooperate. With each of the Anstellschienen 36, 37 at least two in the longitudinal direction of the Anstellschienen 36, 37 spaced apart brackets 47 are connected (in the illustrated embodiment, four), wherein the brackets 47 of the two Anstellschienen 36, 37 opposite each other in pairs and projecting from the Anstellschienen 36, 37 respectively upwards.

The brackets 47 act as a one-armed lever, wherein at the remote from the Anstellschienen 36, 37 ends of the consoles 47 push rods 49 extend between them. In the area between the push rods 49 and the Anstellschienen 36, preferably in the vicinity of Anstellschienen 36, 37 extend between opposite brackets 47 tie rods 50 which pass through the brackets 47 through holes. On the outside of one of the two opposite brackets 47, the tie rod 50 is supported, for example, by a nut 51 screwed onto an external thread of the tie rod. On the outside of the other console 47, the pull rod 50 passes through the spring 48 formed in the illustrated embodiment as a plate spring assembly and is supported on the outside thereof via a contact plate 52 which can be formed, for example, by an enlarged head of the pull rod 50.

Between the brackets 47 and the push rods 49 joints could be present or the low pivoting angle are applied by the elasticity of the material, as in Fig. 4 is shown schematically. The same applies to the connections of the consoles 47 with the Anstellschienen 36th

The Anstellschienen 36, 37 are mounted in the transverse direction on the support frame 1 slidably. A transverse guide 53 on the cross member 5 is in Fig. 1 indicated schematically.

When the drive chains 9, 10 are driven by the motor, not shown in the figures, the clamping units 31 are guided by the drive chains 9, 10 through the intermediate spaces 38, 39, wherein the spring loading of the Anstellschienen 36, 37 against the at the Running surfaces 40, 41 of the Anstellschienen 36, 37 rolling rollers 33 of the clamping units 31, the friction linings 35 are pressed against the support cable 6. As a result, the drive chains 9, 10 are sections of the clamping units 31 in frictional connection with the support cable 6, whereby the cable car is moved.

In order to align the friction linings 35 of the clamping units 31 when entering the intermediate spaces 38, 39 between the Anstellschienen 36, 37 and the support cable 6 to the support cable 6 (in the plane of circulation of the chain and in the direction perpendicular to the support cable 6) are not shown guide parts , z. B. roles available.

Furthermore, it is ensured by auxiliary means, also not shown, that the clamping units 31 are when passing over the sprockets 13, 14 in its open position.

The running surfaces 40, 41 of the Anstellschienen 36, 37 are formed of hardened steel. The rollers 33 of the clamping units 31 are made of steel and are hardened at least in the region of their treads.

The friction linings 35 are made of an elastic material. It is thus of the friction linings only relatively low surface pressure can be introduced, so that a total of relatively large friction surface is required, which can be achieved by the caterpillar-like construction.

In special cases, the clamping units 31 may each have a force acting between the roller 33 and the friction lining 35 spring whose spring force is greater than acting on this clamping unit 31 portion of the total transmitted via the Anstellschienen 36, 37 contact force when the support cable over the clamped area has a constant diameter. It comes therefore with such a constant diameter of the support cable 6 to no compression of such springs not shown in the figures of the support units 31. Only if a local thickening of the support rope is present (eg., By holding down or securing), which on the pressed in the region of this thickening of the support cable clamping unit 31 has a much higher force acts, this spring is compressed and thus acts as overload protection.

Various modifications of the embodiment shown are conceivable and possible without departing from the scope of the invention. For example, it would be conceivable and possible, although less preferred, not to slidably mount the clamping units 31 in window recesses of the link plates 27, 28, but to suspend them from the link plates. The clamping units 31 are then still guided by the intermediate spaces 38, 39, but then the drive chains 9, 10 would extend above these intermediate spaces 38, 39.

Legend to the reference numbers:

1

supporting frame

2

longitudinal beams

3

supporting role

4

supporting role

5

crossbeam

6

supporting cable

7

hanger

8th

vertical plane

9

drive chain

10

drive chain

11

vertical level

12

vertical level

13

first sprocket

14

second sprocket

15

axis of rotation

16

axis of rotation

17

unit

18

unit

19

carrier

20

carrier

21

carrier

22

carrier

23

pivot connection

24

pivot connection

25

feather

26

feather

27

link plate

28

link plate

29

chain pins

30

chain roller

31

terminal unit

32

body

33

role

34

lining support

35

friction lining

36

Anstellschiene

37

Anstellschiene

38

gap

39

gap

40

tread

41

tread

42

section

43

section

44

free end

45

free end

46

spring means

47

console

48

feather

49

pushrod

50

pull bar

51

mother

52

bearing plate

53

width guide

54

supporting role

55

supporting role

56

joint

57

crossbeam

58

connecting arm

59

connecting strap

60

swivel axis

Claims (14)

1. A drive means of a self-propelled cableway carriage, comprising, on either side of the vertical plane (8) in which the supporting cable (6) lies, drive chains (9, 10) which revolve about chain wheels (13, 14) with horizontal axes of rotation (15, 16), which drive chains have chain links with link plates (27, 28) connected by link pins (29) and bear clamping units (31) with friction linings (35) for bearing on the supporting cable (6), and setting rails (36, 37) arranged on opposite sides of the supporting cable (6), the clamping units (31) upon rotation of the drive chains (9, 10) being passed through a gap (38, 39) in each case between the supporting cable (6) and one of the setting rails (36, 37) and in so doing the friction linings (35) of the clamping units (31) being pressed against the supporting cable (6) by rollers (33) which roll on running surfaces (40, 41), the rollers (33) being rotatably mounted on the clamping units (31) and the setting rails (36, 37) having the running surfaces (40, 41) on which the rollers (33) of the clamping units (31) for pressing the friction linings (35) of the clamping units (31) against the supporting cable (6) roll, characterised in that a respective setting rail (36, 37) is tensioned by a spring means (46) against clamping units (31) located in each case in the gap (38, 39) between this setting rail (36, 37) and the supporting cable (6), in that the clamping units (31) are in each case mounted to be displaceable in the two link plates (27, 28) of one of the chain links, one respective clamping unit (31) penetrating window cutouts in the two link plates (27, 28) of a chain link, and in that the friction lining (35) and the roller (33) of a respective clamping unit (31) and also the link plates (27, 28) of the chain link bearing this clamping unit lie in a common plane.
2. A drive means according to Claim 1, characterised in that the spring means (46) comprises brackets (47) connected to the setting rails (36, 37), which brackets are acted upon by springs (48).
3. A drive means according to Claim 2, characterised in that at least two brackets (47) spaced apart in the longitudinal direction of the setting rails (36, 37) are connected to each of the setting rails (36, 37), which brackets lie opposite one another in pairs, with opposing brackets (47) being connected together in each case via tie rods (50) which are acted upon by springs (48).
4. A drive means according to Claim 2 or Claim 3, characterised in that the brackets (47) are designed as one-armed levers.
5. A drive means according to Claim 4, characterised in that the ends remote from the setting rails (36, 37) of opposing brackets (47) in each case are spaced apart from one another by press rods (49).
6. A drive means according to one of Claims 1 to 5, characterised in that the setting rails (36, 37) are mounted to be displaceable transversely to the supporting cable (6) on a supporting frame (1).
7. A drive means according to one of Claims 1 to 6, characterised in that the link pins (29) connecting the link plates (27, 28) lie in a common plane with the friction lining (35) and the roller (33) of the clamping unit (31).
8. A drive means according to one of Claims 1 to 7, characterised in that the first chain wheels (13) of the two drive chains (9, 10) lie coaxially to one another and there is arranged between the first chain wheels (13) a carrying roller (54) lying coaxially thereto which rolls on the supporting cable (6), and in that the second chain wheels (14) of the two drive chains (9, 10) lie coaxially to one another and there is arranged between the second chain wheels (14) a carrying roller (55) lying coaxially thereto which rolls on the supporting cable (6).
9. A drive means according to Claim 8, characterised in that the first chain wheels (13) and the carrying roller located therebetween and also the second chain wheels (14) and the carrying roller located therebetween are designed as units (17, 18) which are rigidly connected to one another.
10. A drive means according to Claim 8 or Claim 9, characterised in that the first chain wheels (13) and the carrying roller (54) located therebetween and also the second chain wheels (14) and the carrying roller (55) located therebetween are mounted on supports (19, 20; 21, 22) which can be pivoted about a horizontal axis which is at right-angles to the supporting cable (6).
11. A drive means according to Claim 10, characterised in that springs (25, 26) act between the supports (19, 20) bearing the one outer carrying roller (54) and the supports (21, 22) bearing the other outer carrying roller (55), which springs, when the supports (19, 20; 21, 22) pivot out of their parallel orientation, exert a restoring force into this parallel orientation.
12. A drive means according to Claim 11, characterised in that the springs (25, 26) act between the supports (19, 20; 21, 22) of these two carrying rollers which are pivotably connected together.
13. A drive means according to Claim 11 or Claim 12, characterised in that the unit comprising the supports (19, 20; 21, 22) is connected pivotably to the supporting frame (1) as a whole, namely about a horizontal pivot axis (60) which is at right-angles to the supporting cable (6) and which lies in a plane extending through the supporting cable (6).
14. A drive means according to one of Claims 8 to 13, characterised in that furthermore middle carrying rollers (3, 4) are rotatably mounted on the supporting frame (1) in the region between these carrying rollers.

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