EP2655240B1 - Lifting apparatus with an adjustable chassis - Google Patents

Description

The invention relates to a lifting device with a chassis, in particular a Einschienenunterflansch suspension.

Suspensions for hoists are also known as trolleys or trolleys. They are known in different versions. Unterflanschfahrwerke often have two side shields, on each of which two wheels are mounted, the side shields are interconnected by a bolt. The load, for example in the form of a chain hoist, can also be fastened to the bolt. Such a chassis is for example from the DE 10 2004 009 062 A1 known.

The corresponding rails exist in different flange widths. It is therefore desirable on the part of the hoist manufacturer to adapt the trolleys to different rails, i. different flange widths to adapt.

The above sees DE 10 2004 009 062 A1 a Abstandsverstellmöglichkeit between the two side shields before. The two side shields are connected to each other via a bolt-shaped traverse, the side shields are mounted on the crossbar adjustable. There are provided securing elements in the form of adjusting rings, which are axially fixable on the truss pin, to prevent inadvertent displacement of the side shields.

Also from the WO 2009/156587 A1 is a chassis with two side shields known whose distance from each other is adjustable. The side shields engage with hook-like projections in a Einhängenut, which is formed in the housing of the hoist. For distance adjustment of the two side shields a threaded rod is provided, which connects the two side shields. A twist of the threaded rod adjusts the distance between the side shields.

Also the EP 0 912 383 B1 discloses a trolley with adjustable track width. Threaded rods connect the two side cheeks with each other and allow the adjustment of the track width. For this purpose, the threaded rods pass through the side cheeks at corresponding openings, where they are then secured by mutually braced nuts.

The GB 2 128 566 A discloses a suspension with adjustable track width. For adjustment, in turn, a threaded spindle is provided which is rotatable on a side plate, but it is axially fixed and which engages in a threaded bore of the opposite side plate. By turning the spindle, the track width can be adjusted. On the two side shields, a load is suspended centrally via swiveling tabs. This design automatically centers the attached load. However, it requires a relatively large amount of space, resulting in hoists to Hubhöhenverlusten and is undesirable.

From the EP 0 802 149 A1 is known a chassis that runs on a crane rail. The chassis has two frames, which are hinged together below the crane rail and carry casters. The spacing of the castors adapts to the width of the running rail.

It has been found that it is important for lifting devices that the pulling means extending from the hoist downwards for lifting the load is located in relatively narrow limits in the center plane of the running rail. When adjusting the track width of a trolley, this must be taken into account. Thus, the track adjustment in the entrusted personnel requires appropriate care.

The US 1,151,226 discloses a landing gear that runs down an I-profile mounting rail. The chassis includes two side parts, on which wheels are rotatably mounted, which run on the lower flange of the mounting rail. The two side parts are connected by a threaded bolt, which is screwed for Abstandsjustage with a right-hand thread in one of the side parts and with a left-hand thread in the other of the side parts. Between the side parts, a portion of the bolt is exposed. At this point it is provided with an annular groove in which a load-bearing tab is hung. By turning the bolt, the distance of the side parts from each other can be adjusted within limits, whereby the load-bearing flap always remains in the middle. However, the bolt is subject to bending stresses.

On this basis, it is an object of the invention to provide a lifting device that can be adjusted particularly easily with reduced susceptibility to different rails or track widths.

This object is achieved with the lifting device according to claim 1:

The lifting device according to the invention consists of a chassis and a hoist, via a linear guide device are interconnected, wherein a distance adjustment device for adjusting the distance of the side parts of the chassis is provided from each other and wherein a centering ensures that the side parts are moved in relation to the hoist with each adjustment, based on the hoist, equidistant to or away from each other , Thanks to the centering is thereby ensured that regardless of the set gauge the load carried by the hoist is suspended centrally under the rail. In this way, tilting moments that could occur with asymmetric adjustment are minimized or avoided. Due to the direct connection between the hoist and chassis via a linear guide device can be ensured that no additional vertical space for the centering device is consumed. Thus, the lifting device according to the invention provides the same lifting height as a non-self-centering lifting device.

The linear guide device allows the adjustment of the side parts transverse to the direction of travel defined by the chassis. The adjustment is horizontal. The distance adjustment of the side parts therefore takes place without changing the height position of the hoist.

The linear guide device for connecting the side parts with the hoist is formed by one or two on the hoist, preferably on the housing of the hoist, trained rib-like bracket or a corresponding groove which is under attack by hook-like extensions of the side parts. The side parts are preferably formed as a sheet metal part. Preferably, a side part is formed as a flat, in side view approximately rectangular, sheet metal part, at its vertical edges it is angled at right angles. From the angled parts Starting from sections extending parallel to each other downwards, which are angled towards each other at their lower ends. The angled parts engage as a hook in the groove or under the console of the housing. The brackets or grooves are preferably arranged at away from each other with respect to the direction of travel front and rear walls of the housing. But it is also possible to use other linear guide devices in another embodiment. For example, the housing of the hoist can be supported by loop-shaped bands that engage under the housing and whose ends are connected to the side panels. Also, as a linear guide, only one groove, for example a T-slot, may be provided, which runs centrally above the housing centrally.

The housing of the hoist is preferably an aluminum housing. In order to ensure a slight clamping-free displacement of the side parts on the housing or to increase the carrying capacity, it is expedient to armor the console accordingly on its side facing the hook. This can serve a steel rail. Which is arranged under the console. Also, such a steel rail can be arranged in a groove to protect the groove flank and to provide a contact surface for the hook.

The distance adjustment device and the centering device can be realized in a single adjustment unit. For example, this consists of a threaded spindle having a right-hand thread at one end and a left-hand thread at the other end. While the right-hand thread is in communication with an internal thread of the one side cheek, the left-hand thread engages with a corresponding left-hand thread of the other side cheek. At a suitable location, for example in the middle or at one end, the threaded rod is axially fixed, thereby however rotatably connected to the housing of the hoist. As a result, the two side parts are adjusted symmetrically to each other upon rotation of the threaded spindle.

Alternatively, the threaded rod may be formed divided, wherein the rotation of the two partial rods is preferably in opposite directions. The two sub-rods can be rotatably mounted on the housing of the hoist but axially immovable. They can each be provided with a gear, the gears mesh with each other and thus cause the desired opposite rotation. In this case, the partial rods can both be provided with right-hand thread and screwed into corresponding threaded holes of the two side parts.

There are different types of adjustment and centering possible. For example, the adjusting device can be formed by a threaded spindle, which is bolted to only one of the side walls and in the other side cheek axially fixed, but rotatable, is stored. The centering of the two side cheeks to the housing of the hoist can be done via a lever mechanism. Preferably, the levers of this lever mechanism lie in a horizontal plane, e.g. between the threaded spindle and the housing of the hoist. In this way, a separate centering device from the adjustment without additional space between the side walls can be accommodated.

Further details of advantageous embodiments of the invention are the subject of the description of claims or the drawings.

• Fig. 1 eine Hebeeinrichtung an einer Fahrschiene in einer perspektivischen schematischen Darstellung,
• Fig. 2 die Hebeeinrichtung nach Fig. 1, in einer vereinfachten Draufsicht,
• Fig. 3 eine Seitenwange mit Gewindespindel, in ausschnittsweiser perspektivischer Ansicht,
• Fig. 4 das Hubwerk und eine Seitenwange des Fahrwerks der Hebeeinrichtung, in einer ausschnittsweisen perspektivischen Darstellung,
• Fig. 5 das Hubwerk und das Fahrwerk nach Fig. 1 und 4, in einer ausschnittsweisen Schnittdarstellung,
• Fig. 6 ein Detail aus Fig. 5,
• Fig. 7 und 8 abweichende Ausführungsformen zu dem Detail entsprechend Fig. 6
• Fig. 9 eine erfindungsgemäße Hebeeinrichtung, in schematisierter Draufsicht, in einer abgewandelten Ausführungsform,
• Fig. 10 eine ausgewandelte Ausführungsform eines Seitenteils und eines Gehäuses in ausschnittsweiser Schnittdarstellung,
• Fig. 11 das Seitenteil nach Figur 10 in Vertikalschnittansicht,
• Fig. 12 eine abgewandelte Ausführungsform einer Hebeeinrichtung, in ausschnittsweiser Perspektivansicht,
• Fig. 13 eine weitere abgewandelte Ausführungsform einer Hebeeinrichtung, in ausschnittsweiser Perspektivansicht, und
• Fig. 14 die Hebeeinrichtung nach Figur 13 in Schnittdarstellung.

The following description is limited to the details of embodiments required for understanding and assumes the usual technical understanding with regard to the addition of constructive details. Show it:

• Fig. 1 a lifting device on a running rail in a perspective schematic representation,
• Fig. 2 the lifting device after Fig. 1 in a simplified plan view,
• Fig. 3 a side cheek with threaded spindle, in a fragmentary perspective view,
• Fig. 4 the hoist and a side wall of the chassis of the lifting device, in a fragmentary perspective view,
• Fig. 5 the hoist and the chassis after Fig. 1 and 4 in a fragmentary sectional view,
• Fig. 6 a detail from Fig. 5 .
• FIGS. 7 and 8 different embodiments according to the detail accordingly Fig. 6
• Fig. 9 a lifting device according to the invention, in a schematic plan view, in a modified embodiment,
• Fig. 10 a modified embodiment of a side part and a housing in a sectional detail view,
• Fig. 11 the side part after FIG. 10 in vertical section view,
• Fig. 12 a modified embodiment of a lifting device, in a fragmentary perspective view,
• Fig. 13 a further modified embodiment of a lifting device, in a fragmentary perspective view, and
• Fig. 14 the lifting device after FIG. 13 in section.

In Fig. 1 a crane rail 10 is illustrated with a lifting device 11 movable thereon. The lifting device 11 is used for lifting and method of not further illustrated loads. A designated hook 12 is in Fig. 1 illustrated schematically.

The crane rail 10 has an upper and a lower flange 13, 14, which are connected to each other via a vertical web 15. The latter defines a vertical longitudinal median plane. The crane rail 10 has a given width, which is defined by the width of the lower flange 14. The lifting device 11 can be adapted to crane rails with flanges 14 of different widths. It has a correspondingly adjustable chassis 16, that the hoist 17 carries. The hoist 17 carries the hook 12 by means of a chain 18 or other traction means, such as a rope, a belt or the like.

Fig. 2 illustrates the lifting device 11 in a schematic plan view. To the chassis 16 includes two side parts 19, 20, which are preferably arranged parallel to each other at an adjustable distance from each other. Each of the side parts 19, 20 carries at least one, preferably two, wheels 21, 22, 23, 24, which are rotatably mounted on the side parts 19, 20. They are adapted to run on top of the flange 14.

At least one of the wheels 21 - 24, in the present embodiment, the impeller 24 is connected to a traction drive 25. This consists for example of a motor gear unit, which is correspondingly remotely controllable to effect a targeted driving movement of the lifting device 11 on the crane rail 10. The traction drive 25 can, for example via not further illustrated gears on more Wheels of the same side part 20, preferably the wheel 23, act. The wheels 21, 22 run with no drive. However, it is also possible to assign drives to these wheels 21, 22.

The lifting of the load is effected by a lifting drive 26, for example, to an in Fig. 5 indicated sprocket 27 acts. The lifting drive 26 is preferably flanged to a lateral end face of the hoist 17.

The hoist 17 comprises a housing 28 or other basic support, on the one hand supports the linear actuator 26 and on the other hand, the sprocket 27, a cable drum or the like. The housing 28 may consist, for example, of a middle part 28a and two side terminations 28b, 28c (FIG. FIG. 4 ), which are flanged on the front side to the central part 28 a. At the central part 28a, the transmission is arranged with sprocket and flanged motor. The side finishes 28b, 28c are preferably (but not necessarily) cup-shaped or profiled tubular shaped and accommodate the engine and the transmission and optionally a controller. The housing 28 is connected to the chassis 16 by at least one, preferably two, linear guides 29, 30. The linear guides 29, 30 are disposed on sides of the housing 28 facing away from each other and formed symmetrical to each other. The following description of the linear guide 30 therefore applies correspondingly to the linear guide 29.

To the linear guide 30 belongs, as in particular from Fig. 4 shows, one also off FIGS. 5 and 6 apparent console 31, which protrudes as a horizontally extending rib with eg horizontal lower surface of the housing wall of the housing 28 away. The bracket 31 may also be part of the boundary of a groove 32, below the bracket 31 horizontal over the vertical front or rear wall of the housing 28 runs. The bracket 31 and / or the groove 31 may extend over the middle part and the side ends of the housing 28.

Preferably, the console 31 is armored. If the housing 28 is made of aluminum, a e.g. made of steel (e.g., smooth drawn sheet or ground) bar 33 may be placed in the groove 32 or under the bracket 31. The rail 33 may be designed as a flat rail, angle rail, as a round profile or otherwise appropriate.

To the linear guide 30 also includes a hook-like projection 34 extending from an angled wall 35 (FIG. Fig. 4 ) of the side part 19 extends downwards. The hook-like extension 34 engages under the bracket 31, as in particular Fig. 6 evident. If necessary, the extension 34 can be secured in place with a clamping piece 34a. The clamping piece can be wedge-shaped and held in the groove 32 with corresponding fastening means, not further illustrated, such as screws, bolts, clamping claws or the like. Alternatively, for example, a series of threaded bores may be provided in the console, to which clamping screws for attaching the extension 34 are assigned. Alternative clamping options for the need-based fixation and solution of the linear guide device 30 are possible. Also, the extensions can engage under the housing as a whole and so make the console 31 redundant. The linear guide also results in this case by the displaceability of the extensions along the housing 28th

The side part 19 has on the opposite side of the linear guide 29 a similar extension 34 ' on. Next, the side parts 19, 20 formed symmetrically to each other, so that the description of the side part 19 applies mutatis mutandis to the side part 20 and its extensions.

Fig. 2 illustrates a distance adjustment device 36, by means of which the side parts 19 and 20 can be moved toward and away from each other. The distance adjusting device 36 comprises a threaded spindle 37 which carries a right-hand thread 38 at one end and a left-hand thread 39 at its other end. The right-hand thread 38 is screwed into a corresponding threaded opening 40, which is formed on the right side part 20, for example in a bushing. The left-hand thread 39 is screwed to a threaded opening 41 which is formed on the side part 19 or a socket 41 a connected thereto. The bushing 41 a is welded or otherwise connected to the side part 20. Preferably, their length exceeds their diameter. Preferably, the length is at least twice or three times the inner diameter. As a result, the threaded spindle gives the side parts a parallel guidance. At a front end of the threaded spindle 37, a coupling opening 43 for attaching a tool, such as a hex key, may be provided. Further, one or more lock nuts 44 can be seated on the threaded spindle 37 in order to secure the threaded spindle 37 in a torque-proof manner as required.

To the chassis 16 also includes a centering device 45, the exemplary in Fig. 2 is illustrated. In this simple embodiment, the centering device 45 consists of a collar or radial flange 46 which sits axially immovably on the threaded spindle 37. The radial flange 46 engages in a recess 47 in a housing projection 48 (see Fig. 2 and 5 ) educated is. The housing projection 48 may be located centrally on the top of the housing 28.

The radial flange 46 is in the embodiment according to Fig. 2 formed centrally on the threaded spindle 37 and fixed the threaded spindle 37 on the housing 28, although rotatable, but axially immovable. Instead of the solution presented, however, other fixing options can be provided, for example, a rolling bearing of the threaded spindle 37 on the housing 28. In addition, the fixation does not necessarily have to be arranged centrally. It can just as well be provided at one end of the threaded spindle 37. It is essential that an axial adjustment of the threaded spindle 37 with respect to the housing 28 is prevented.

The adjustment of the track is done by turning the threaded spindle 37. As a result, the side parts 19, 20 are moved toward or away from each other. With respect to the housing projection 48, the stroke distance of the right and left housing parts 19, 20 are each uniform. This results from the fact that the pitches of the threads 38, 39 have the same amount but opposite sign.

Due to the axial fixation of the threaded spindle 37, the hoist 17 remains centered with respect to the running rail 10. The chain 18 does not move out of the predetermined by the web 15 level.

If the chassis 16 is set to the desired track width, the threaded spindle 37 can be secured with the lock nut 44 and optionally further locknuts. In addition, the extensions 34 can be secured by the clamping pieces 34a or otherwise stationary.

At the presented lifting device 11 several modifications are possible. For example, illustrated Fig. 7 a housing 28 which has only the console 31 instead of a groove, which is under attacked by the extension 34. Fig. 8 illustrates an example to illustrate the fact that the bottom of the console 31 does not necessarily have to be flat or flat. The groove 32 may, if necessary, also have an undercut. This measure keeps the extension 34 particularly secure in the groove 32.

While in the above embodiment, the centering device 45 and the Abstandsverstelleinrichtung 36 were formed in the shape of the provided with the radial flange 46 threaded spindle 37 on one and the same machine part, it is also possible to separate these functions. Such an embodiment shows Fig. 9 , Again, a threaded spindle 37 is provided, which is, however, provided here only at its right end with the right-hand thread 38. The left end is rotatably axially retained in a bearing 49 which is attached to the side member 19.

For centering the centering device 45 is formed here by a lever apparatus. On the housing 28, a longitudinal groove 50 is provided at the top. The groove 50 is oriented transversely to the threaded spindle 37. The longitudinal direction of the groove 50 coincides with the direction of travel of the wheels 21-24.

In the groove 50 run one or two sliding blocks 51, 52. The sliding block 51 is pivotally connected via two links 53, 54 provided on the side parts 19, 20 tabs 55, 56. Likewise, the nut 52 is connected via links 57, 58 with the tabs 55, 56. Be the side parts 19, 20 by actuation of the threaded spindle 37, that is, by targeted rotation of the same, towards each other or away from each other, the sliding blocks 51, 52 are displaced in the groove 50 toward or away from each other. They hold on the links 53, 54, and 57, 58, the side parts 19, 20 at the same distance from the central groove 50th

Instead of the illustrated threaded spindle 37, which carries only the right-hand thread 38, it is also possible to use a threaded rod with a uniform thread, which extends through holes in the side parts 19, 20. The side parts 19, 20 can then be secured with nuts on the threaded spindle and thereby kept at the desired distance. It is also possible to use a threaded spindle 37 with right-hand thread 38 and left-hand thread 39, as previously associated with FIG Figure 1 to 8 has been described. However, this threaded spindle is then not axially fixed to the housing 28. The centering takes place via the separate centering device 45. The spindle 37 alone serves as a distance adjusting device.

The Figures 9 and 10 show an alternative embodiment of side part 19 and housing 28 in a schematic representation. The side part 20 is formed corresponding mirror-symmetrically to the side part 19. The side part 19 in turn has the extension 34, which is angled down and thus has a slightly rising portion. This protrudes into the likewise slightly rising trained groove 32. For fixing the side part 19 in a desired sliding position, a suitable clamping means may be provided. Preferably, the clamping means acts from above on the console 31, thus the bracket 31 is tensioned between the angled extension and the clamping means. As an example, an eccentric 59 serve as a clamping means, of a side member 19 by cross-bolt 60th worn. The bolt 60 may be secured by a lock nut 61 against rotation. The lock nut 61 is screwed onto the bolt and braces it against the side part 19th

By selective rotation of the bolt 61 of the rotatably connected to the bolt 60 eccentric 59 can be tightened or released against the console 31.

FIG. 12 illustrates a further embodiment of side part 19 (and corresponding mirrored side part 20) and the housing 28. The latter can be constructed as previously explained one or more parts. The previous description is based on the already introduced reference numerals accordingly. In addition, the following applies: The projection 34 is provided with a finger 62. This extends downwardly via the groove 32 via a second groove 63, which is arranged in the housing 28 parallel to the first groove 32. The groove 63 is preferably formed as an undercut groove 63. In the groove 63 not shown further Nutensteine can be arranged, each with a threaded hole or other fastening or Verankerrungsmittel. Such nuts are preferably arranged in the groove 63 easily displaced.

The finger 62 has, for example at its lower end a aligned with the groove 63 bore 64. Through this hole, a screw can be screwed into the threaded hole of the sliding block. When the screw is tightened, the slightly elastic finger 62 is pressed against the housing. The screw and the finger 62 thus secure the side member 19 (20) immovably and firmly to the housing 28. After loosening the screw, the side member can be provided by operating the Abstandsverstelleinrichtung 36, which in one of the embodiments described above can be adjusted along the grooves 32, 63.

Another embodiment of the lifting device 11 is in the FIGS. 13 and 14 illustrated. As far as identical construction or function to the above-described embodiments, the introduced reference numerals are used in the same way. The previous description applies in particular to all possible implementations and alternatives, with particular regard to the adjustment device 36 accordingly.

The modification of the lifting device 11 after FIGS. 13 and 14 consists in the design of the rail 33. This is designed as a hook rail 33a, 33b or z-rail. Their length corresponds to the corresponding length of the housing. In cross section, it is z-shaped or hook-shaped. With a lower leg, it engages under the console 31. Your upper leg lies on the extension 34. In this way, a stable construction with large-scale load introduction into the housing 28 is provided. The hook rail 33a, 33b is preferably made of steel. It can be provided as a milled part or as a sheet metal part. It forms a holding profile that sits securely in the console 31. Preferably, the upper part forms a hook head 33c which is offset horizontally against a lower hook leg 33d. Thus, the extension 34 can stand vertically just above the console 31. The hook rail 33a, 33b is thus torque-free and transmits only tensile forces. However, it may also be desired and expedient to provide a horizontal offset between the hook head 33c and the hook foot 33d. In this way, the force can be optimized in the console.

The lifting device 11 according to the invention comprises a chassis 16 and a hoist 17, which via linear guides 29, 30 are interconnected. The chassis 16 comprises two side parts 19, 20, which are adjustable by means of a distance adjusting device 36 with respect to their distance from one another. They are centered by a centering device 45 with respect to the hoist 17, in particular with respect to the traction means emanating from the hoist 17.

LIST OF REFERENCE NUMBERS

10

crane rail

11

lifter

12

hook

13

Upper flange of crane rail 10

14

Bottom flange of crane rail 10

15

center web

16

landing gear

17

hoist

18

Chain

19

Left side panel

20

Right side part

21 - 24

impellers

25

traction drive

26

Linear actuator

27

gipsy

28

casing

29, 30

linear guide

31

console

32

groove

33

rail

33a, 33b

hook rail

34, 34 '

extension

34a

clamp

35

wall

36

Abstandsverstelleinrichtung

37

screw

38

right-hand thread

39

left-hand thread

40

Threaded opening with right-hand thread

41

Thread opening with left-hand thread

41a

Rifle

42

The End

43

coupling opening

44

locknut

45

centering

46

radial flange

47

recess

48

housing projection

49

Storage facility

50

groove

51, 52

sliding block

53, 54

handlebars

55, 56

tabs

57, 58

handlebars

59

eccentric

60

bolt

61

mother

62

finger

63

groove

64

drilling

Claims (12)

1. Lifting device (10)
   with running gear (16), which has two side parts (19, 20) respectively with at least one running wheel (21-24),
   with hoisting gear (17), which carries a traction mechanism (18) in a height adjustable manner for load pick-up,
   with a linear guide device (29, 30), by means of which the side parts (19, 20) are connected to the hoisting gear (17) in a supporting manner and which defines a horizontal displacement direction,
   wherein for connection of the side parts (19, 20) to the hoisting gear (17) the linear guide device (29, 30) is formed by one or two rib-like brackets (31), which are configured on the hoisting gear (17) and are gripped from below by hook-like extensions (34, 34') of the side parts (19, 20), or a corresponding groove (32), into which hook-like extensions (34, 34') of the side parts (19, 20) grip,
   with a spacing adjustment device (36) for adjusting the distance of the side parts (19, 20) from one another,
   characterised in that
   the lifting device (11) has a centring device (45) for generating opposing adjusting movements of the side parts (19, 20) of equal dimension relative to the hoisting gear (17).
2. Lifting device according to claim 1, characterised in that the running gear (16) has at least one travel drive (25), which is connected to at least one of the wheels (24) to drive same.
3. Lifting device according to one of the preceding claims, characterised in that the side parts (19, 20) are configured as sheet metal bent parts.
4. Lifting device according to claim 1, characterised in that a rail (33) preferably made of steel is provided on the bracket (31).
5. Lifting device according to claim 1, characterised in that the extension (34) is displaceable along the bracket (31).
6. Lifting device according to one of the preceding claims, characterised in that the centring device (45) is connected to the hoisting gear (17).
7. Lifting device according to one of the preceding claims, characterised in that the centring device (45) is configured as a component of the spacing adjustment device (36).
8. Lifting device according to one of the preceding claims, characterised in that the spacing adjustment device (36) comprises a threaded spindle (37) with at least one thread (38).
9. Lifting device according to one of the preceding claims, characterised in that the spacing adjustment device (36) comprises a threaded spindle (37) with a right-hand thread (38) and with a left-hand thread (39), wherein the right-hand thread (38) meshes with a thread (40) associated with one of the side cheeks (20), whereas the left-hand thread (39) meshes with a thread (41) associated with the other side cheek (19).
10. Lifting device according to claim 9, characterised in that the threaded spindle (37) is connected to the hoisting gear (17) to be axially fixed.
11. Lifting device according to one of the preceding claims, characterised in that the spacing adjustment device (36) comprises a threaded spindle (37), which is connected to one of the side parts (19, 20) to be axially fixed.
12. Lifting device according to claim 8, characterised in that the threaded spindle meshes with a threaded bushing (41a), which is fixedly connected to one of the side parts (19, 29).

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