DK176328B1

DK176328B1 - Carriage kits for handling and transporting wind turbine blades.

Info

Publication number: DK176328B1
Application number: DK200000610A
Authority: DK
Inventors: Anders Boisen; Moelgaard Christensen Ole
Original assignee: Lm Glasfiber As
Priority date: 2000-04-12
Filing date: 2000-04-12
Publication date: 2007-08-13
Also published as: DK200000610A

Description

i DK 176328 B1in DK 176328 B1

Opfindelsen angår et vognsæt til håndtering og transport af vindmøllevinger med en i hovedsagen cylindrisk vingerodsende og en vingetipende og omfattende en vingerodsvogn og en vingetipvogn, hvilken vingetipvogn omfatter en tipvognsramme med kørehjul og en drejeligt om en horisontal akse på rammen anbragt drejekrans, som er forsynet 5 med en støtte- og fastgørelsesindretning til understøtning og fastgørelse af vingetipenden, hvilken vingerodsvogn omfatter en rodvognsramme med kørehjul, en på rammen anbragt støtteindretning med ruller til understøtning af vingerodsenden, hvor mindst en af rullerne er en drivrulle med friktionsoverflade, som kan drives til rotation for drejning af en på vognsættet anbragt vinge om dens centrale længdeakse, idet rullernes akser er i hold vedsagen parallelle med vingens centrale længdeakse, hvor vingerodsvognens støtteind-retning omfatter to med indbyrdes afstand anbragte vægtstangsindretninger, i hver af hvilke der med indbyrdes afstand drejeligt er lejret to ruller, og hvor hver af vægts tangs-indretningerne er anbragt svingbart i forhold til rodvognsrammen om en svingakse, som er i hovedsagen parallel med rulleakseme og beliggende mellem disse set i retning 15 vinkelret på det af rulleakseme definerede plan.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carriage set for handling and transporting wind turbine blades having a generally cylindrical wing tip and a wing tip and comprising a wing root carriage and a wing tip carriage, with a support and fastening device for supporting and fastening the wing tip, said wing root carriage comprising a root carriage frame with drive wheels, a support device with rollers for supporting the wing root end, at least one of the rollers being a friction surface drive roller which can be rotated for rotation. rotating a wing disposed on the carriage set about its central longitudinal axis, the axes of the rollers being held parallel to the central longitudinal axis of the vane, wherein the wing carriage support device comprises two spaced-apart barbell devices, each of which is spaced apart d is pivotally mounted two rollers, each of the pliers of the weight being arranged pivotally with respect to the root carriage frame about a pivot axis which is substantially parallel to the rolling axes and located therebetween in the direction 15 perpendicular to the plane defined by the rolling axes.

Der kendes vognsæt af den nævnte art, hvor vingerodsvognens støtteindretning består af to med indbyrdes afstand anbragte ruller, hvoraf den ene er en drivrulle med en overflade, der har en sådan friktionskoefficient i forhold til overfladen af en herpå anbragt vinge, at rullen kan dreje denne. Vognsættet og den ved hjælp af vingerodsvog-20 nens drivrulle muliggjorte drejning af vingen, benyttes dels til intern transport af vinger i virksomheden og dels i forbindelse med at de støbte vinger efterbearbejdes, hvor det er væsentligt at kunne dreje disse.It is known in the case of carriage sets of the said kind, in which the support device of the wing carriage consists of two spaced-apart rollers, one of which is a drive roller having a surface which has such a coefficient of friction with respect to the surface of a wing placed on it that the roller can rotate it. . The carriage set and the rotary blade of the vane trolley enabled by the rotary vane are used partly for the internal transport of blades in the company and partly in connection with the reworking of the cast blades, where it is important to be able to turn them.

Udviklingen indenfor vindmølleområdet går i retning af stadig større vindmøller og dermed stadig større vinger. Kendte vognsæt til håndtering af vindmøllevinger har vist 25 sig ikke at være i stand til at håndtere sådanne større vinger på helt tilfredsstillende måde, især på grund af at vingerodsvognens to ruller er tilbøjelige til at bevirke en uønsket og undertiden skadelig deformation af vingens rodende og giver problemer med drejning af vingen.The development within the wind turbine area is moving towards ever-larger wind turbines and thus increasingly larger blades. Known wagon sets for handling wind turbine blades have been found to be incapable of handling such larger blades in a perfectly satisfactory manner, especially because the two rollers of the blades wagon tend to cause an undesirable and sometimes harmful deformation of the blade's rooting and problems with turning the wing.

2 DK 176328 B12 DK 176328 B1

Der kendes endvidere fra US 3.836,103 en støtteindretning til understøtning og rotation af store cylindriske emner, og som omfatter to med indbyrdes afstand anbragt vægtstangsindretninger, i hver af hvilke der med indbyrdes afstand drejeligt er lejret ruller, og hvor hver vægtstangsindretning er anbragt svingbart i forhold til rammen om en 5 svingakse, og hvor der på rullerne kan anbringes et større cirkulært emne for rotation. Svingakseme er anbragt i det af ralleakserne definerede plan.Also known from US 3,836,103 is a support device for supporting and rotating large cylindrical parts, and comprising two spaced-apart barriers, each of which is spaced with rotatable bearings, and each bar of which is pivotally mounted in relative to the frame of a 5 pivot axis, and where a larger circular blank can be placed for rotation. The pivot axes are arranged in the plane defined by the rally axes.

Formålet med den foreliggende opfindelse er, at anvise et vognsæt af den indledningsvist nævnte art til afhjælpning af ovennævnte ulemper ved kendte vognsæt.The object of the present invention is to provide a carriage set of the kind mentioned above to remedy the above-mentioned disadvantages of known carriage sets.

Til opnåelse af dette formål er vognsættet ifølge opfindelsen ejendommelig ved, at 10 mindst den ene og fortrinsvis begge vægtstangsindretninger er anbragt vipbart i forhold til rodvognsrammen om en vippeakse til at tillade, at den mindst ene vægtstangsindret-ning indtager stillinger, hvor de to heri anbragte rullers akser ikke er parallelle med akserne af rullerne i den anden vægtstangsindretning, og at vægtstangsindretningemes svingakser er tilvejebragt ved de ydre ender af skråt opad og indad fra rodvognsrammen 15 forløbende ben.To achieve this purpose, the carriage set of the invention is characterized in that at least one and preferably both lever means are tiltably positioned relative to the root carriage frame of a rocker axis to allow the at least one lever device to take positions where the two are disposed therein. the axes of rollers are not parallel to the axes of the rollers of the second lever assembly, and the pivot axes of the lever assemblies are provided at the outer ends of inclined upwardly and inwardly from the legs of the root carriage frame 15.

Når en viiidmøllevinge skal anbringes i vognsættet løftes denne op, f.eks. af en støbeform, ved hjælp af en kran. Herefter føres vingetipvognen ind over vingetippen og vingerodsvognene ind under rodenden. Dernæst sænkes vingen ned på vingetipvognens støtte- og fastgørelsesindretning og på vingerodsvognens støtteindretning. Når vingens 20 rodende sænkes ned på rodvognens støtteindretning vil vægtstangsindretningeme automatisk dreje om deres svingakser, således at begge deres ruller får anlæg mod rodendens i hovedsagen cylindriske overflade og understøtter vingen. Herved reduceres belastningen af vingeskallen og derved risikoen for at denne påføres skadelige deformationer. Vippeaksen tillader at den mindst ene og fortrinsvis begge vægtstangsindretninger indta-25 ger en stilling, hvor begge dens/deres ruller over hele deres længde er i berøring med vingerodendens overflade, selv når rodenden ikke er fuldstændig cylindrisk med let ko- 3 DK 176328 B1 nisk. Herved undgår i tilfælde af en let konisk vingerodsende en utilladelig punktbelast-ning af denne, ifølge opfindelsen kan den mindst ene vippeakse være tilvejebragt ved et af de skrå bens nedre ender.When a long-wind turbine blade is to be placed in the carriage set, it is lifted, e.g. of a mold, using a crane. Then the wingtip trolley is inserted over the wingtip and the wingtip trolleys under the root end. Next, the wing is lowered onto the wingtip trolley support and fastening device and on the wingtip trolley support device. As the root 20 of the blade 20 is lowered onto the root carriage support device, the lever devices will automatically rotate their pivot axes so that both of their rollers abut the root end of a generally cylindrical surface and support the blade. This reduces the load on the blade shell and thereby the risk of it being applied to harmful deformations. The rocker axis permits the at least one and preferably both lever devices to occupy a position where both its / their rollers, over their entire length, are in contact with the surface of the wing end, even when the root end is not completely cylindrical with light carbon. . In this case, in the case of a slightly tapered wing root end, an inadmissible point loading thereof is avoided, according to the invention the at least one tilt axis may be provided at one of the lower ends of the inclined legs.

5 Fremdeles kan der ifølge opfindelsen forefindes midler til indstilling af den indbyrdes afstand mellem de to vægtstangsindretninger for herved at gøre det muligt at benytte vognsættet ifølge opfindelsen og specielt rodendevognen til vinger med forskellige rodendediametre.5 Still, according to the invention, means can be provided for adjusting the spacing between the two lever devices to make it possible to use the carriage set according to the invention and in particular the rowing car for wings with different rowing diameters.

Indstillingsmidleme kan ifølge en udførelsesform for opfindelsen kan udgøres af rod-10 vognsrammen, idet denne består af to vognparter, som hver er forsynet med en vægtstangsindretning og som er forbundet indbyrdes forskydeligt på tværs af de i vægtstangs-indretningeme anbragte rullers akser.According to an embodiment of the invention, the adjusting means can be constituted by the root carriage frame, which consists of two carriage parts, each of which is provided with a barbell device and which are interconnected displaceably across the axes of the barbell devices.

I denne forbindelse kan indstillingsmidleme udgøres af de tidligere nævnte skrå ben, idet hvert af disse er udformet som teleskopagtigt længdeindstilleiige ben.In this connection, the adjusting means can be constituted by the aforementioned inclined legs, each of which is designed as telescoping longitudinally adjustable legs.

15 Yderligere kan ifølge opfindelsen hver af vægtstangsindretningemes svingakser være anbragt med lige stor afstand til dens to rullers akser.Further, according to the invention, each of the pivot axes of the lever devices may be spaced equally spaced from the axes of its two rollers.

I forbindelse med ovennævnte udførelsesform kan hver af vægtstangsindretningemes svingakser være anbragt i planet defineret af dens rullers akser.In connection with the above embodiment, each of the pivot axes of the lever devices may be arranged in the plane defined by the axes of its rollers.

Desuden kan ifølge opfindelsen vægtstangsindretningemes ruller hensigtsmæssig have 20 samme diameter.In addition, according to the invention, the rollers of the lever devices may conveniently have the same diameter.

4 DK 176328 B14 DK 176328 B1

Endelig kan ifølge opfindelsen alle rullerne være drivruller, som har en ydre ffiktionso-verflade, fortrinsvis af gummi med henblik på at sikre et godt indgreb med rodendes ydre overflade og derved den ønskede drejning af vingen.Finally, according to the invention, all of the rollers may be drive rollers having an outer fictional surface, preferably of rubber, to ensure good engagement with the outer surface of the root and thereby the desired rotation of the blade.

Opfindelsen forklares nærmere nedenfor under henvisning til tegningen, hvor 5 fig. 1 viser skematisk og set i perspektiv et vognsæt ifølge opfindelsen med en herpå anbragt vinge, fig. 2 en vingerodsvogn, set fra enden, dvs. aksialt mod rodenden af en heri anbragt vinge, fig. 3 samme set fra siden i retningen III i fig. 2, 10 fig. 4 en tipendevogn set fra enden, dvs. aksialt i retning mod en heri anbragt vinges tipende og fig. 5 samme set fra siden i retningen V i fig. 4.The invention is explained in more detail below with reference to the drawing, in which: FIG. 1 is a schematic perspective view of a carriage set according to the invention with a wing mounted thereon; FIG. 2 is a winged carriage, viewed from the end, ie. axially to the root end of a wing disposed therein; 3 is a side view in the direction III of FIG. 2, 10 FIG. 4 shows a tipping trolley seen from the end, ie. axially towards the tip of a blade disposed therein and FIG. 5 is a side view in the direction V of FIG. 4th

Som vist på tegningen omfatter vognsættet til håndtering og transport af en vindmølle-vinge 1 med en i hovedsagen cylindrisk vingerodsende 2 og en vingetipende 3, en vinge-15 rodsvogn 4 og en vingetipvogn 5 (se især fig. 1, hvor vingen 1 er vist i en vandret stilling, dvs. med vingeprofilens korde i hovedsagen vandret). Som det vil fremgå nærmere nedenfor tjener vognsættet primært til at dreje vingen 1 om den centrale længdeakse C i forbindelse med der gennemføres arbejder på denne.As shown in the drawing, the carriage kit for handling and transporting a wind turbine vane 1 with a generally cylindrical vane tip 2 and a vane tip 3, a vane root carriage 4 and a vane tip van 5 (see, in particular, Fig. 1, where the vane 1 is shown in a horizontal position, i.e. with the chord of the blade profile substantially horizontal). As will be seen in more detail below, the carriage set primarily serves to rotate the wing 1 about the central longitudinal axis C in connection with work carried out on it.

Idet der især henvises fig, 4 og 5 omfatter vingetipvognen 5 en i hovedsagen rektangulær 20 tipvognsramme 6, som ved hvert hjørne er forsynet med et hjul 7. Fra rammen 6 strækker to sidegavle 8, 9 sig lodret opad. I rammen er der anbragt en drejekrans 10 med horisontal centerakse 11. Drejekransen er på den ydre periferi understøttet af to med 5 DK 176328 B1 flanger forsynede ruller 12, 13, som er anbragt drejeligt i konsoller 14, 15, der er fastgjort til rammen 6. Drejekransen 10 holdes i dens lodrette stilling ved hjælp af to sæt styreruller, som er anbragt ved den øvre ende af hver sidegavl 8,9, Rullerne i hvert rullesæt lægger an mod hver sin sideflade af drejekransen 10. I fig. 5 er der vist en 5 enkelt styrerulle 16.Referring in particular to Figs. 4 and 5, the wingtip trolley 5 comprises a generally rectangular 20 trolley frame 6, which is provided at each corner with a wheel 7. From the frame 6, two side ends 8, 9 extend vertically upwards. In the frame is arranged a pivot ring 10 with horizontal center axis 11. The pivot ring is supported on the outer periphery by two rollers 12, 13 provided with flanges 12, 13 which are pivotally mounted in brackets 14, 15 which are fixed to the frame 6 The turntable 10 is held in its vertical position by means of two sets of guide rollers arranged at the upper end of each side face 8,9. The rollers in each roller set abut each side surface of the turntable 10. In fig. 5 shows a 5 single guide roller 16.

I drejekransen 10 er der anbragt en støtte- og fastgørelsesindretning 17 til understøtning og fastgørelse af vingetipenden 3. Støtte- og fastgørelsesindretningen 17 omfatter to fast med drejekransen 10 forbundne stænger 18,19, som med indbyrdes afstand strækker sig tværs gennem drejekransen 10.In the pivot 10 is supported a support and fastening device 17 for supporting and fastening the blade tip 3. The supporting and fastening device 17 comprises two bars 18, 19 connected to the pivot ring 10, spaced apart transversely through the pivot 10.

10 Ved hver af tværstængemes 18,19 ene ende er der nær drejekransen 10 drejeligt forbundet en arm 20, 21, som strækker sig ind i kransens 10 indre. Armene 20, 21 kan drejes ved hjælp af en spindel 22, der er forsynet med et håndtag 23. Hver af armene 20, 21 er ved deres mod hinanden vendende sider forsynet med en tryksko 24, 25, hvis form ved hjælp af justeringsskruer 26 kan ændres til at blive bragt i fladeanlæg med henholds-15 vis vingens under- og overside.At one end of each of the cross rods 18,19, an arm 20, 21 which is pivotally connected to the interior of the rim 10 is pivotally connected to the ring 10. The arms 20, 21 can be turned by means of a spindle 22 provided with a handle 23. Each of the arms 20, 21 is provided at their opposite sides with a pressure shoe 24, 25, the shape of which by means of adjusting screws 26 can is altered to be brought into surface systems with the lower and upper sides of the wing respectively.

Støtte- og fastgørelsesindretningen 17 omfatter endvidere en løftestrop 27, som er forbundet mellem de to arme 20, 21 og hvis længde kan justeres ved hjælp af en talje 28. Løftestroppen 27 er forsynet med en pude 29 til at understøtte vingens forkant. Ved hjælp af at støtte- og fastgørelsesindretningen kan en vingetipende fastgøres således til 20 vingetipvognen at vingens centrale længdeakse C er i hovedsagen sammenfaldende med drejekransens horisontale centerakse 11.The support and fastening device 17 further comprises a lifting strap 27 which is connected between the two arms 20, 21 and the length of which can be adjusted by means of a waist 28. The lifting strap 27 is provided with a pad 29 to support the leading edge of the wing. By means of the support and fastening device, a blade tip can be secured to the blade tip carriage such that the central longitudinal axis C of the blade is substantially coincident with the horizontal center axis 11 of the pivot.

Idet der henvises til fig. 2 og 3 omfatter vingerodsvognen 4 en i hovedsagen rektangulær rodvognsramme 30, som består af to rammeparter 31, 32, som er teleskopisk forskydelige i forhold til hinanden til ændring af rodvognsrammens 30 bredde. Ved hver af ram-25 mens hjørner er der anbragt et hjul 33. På hver af rammeparteme 31, 32 er der anbragt et rullestativ 34, 35, som hver har et ben 36, 37, der strækker sig skråt opad og indad 6 DK 176328 B1 mod hinanden. Ved hvert skrå bens 36, 37 øvre ende er der drejeligt om en vandret svingakse 38, 39 lejret en vægtstang 40, 41. Ved modstående ender af vægtstangen 40, 41 er der drejeligt om vandrette rulleakser 42, 43; 44, 45, lejret ruller 46, 47; 48, 49. Rullerne er identiske og er på deres periferi forsynet med en friktionsbelægning af gum-5 mi.Referring to FIG. 2 and 3, the wing root carriage 4 comprises a substantially rectangular root carriage frame 30, which consists of two frame portions 31, 32 which are telescopically displaceable relative to each other for changing the width of the carriage frame 30. At each of the frame 25 at corners there is arranged a wheel 33. On each of the frame parts 31, 32 there is arranged a roller stand 34, 35, each having a leg 36, 37 extending obliquely upwards and inwards 6 DK 176328 B1 towards each other. At the upper end of each inclined leg 36, 37 there is pivoted about a horizontal pivot axis 38, 39 a bar 40, 41. At opposite ends of the bar 40, 41 there are pivoted horizontal rolling axes 42, 43; 44, 45, camp rolls 46, 47; 48, 49. The rollers are identical and are provided on their periphery with a friction coating of gum-5 ml.

Hver af rullerne 46, 47; 48, 49 drives ved hjælp af en gearmotor 50, 51. Vægtstængernes 40, 41 svingakser 38, 39 bevirker at når en rodende 2, der er illustreret punkteret i fig. 2, anbringes på rodende vognen vil rullerne 46 til 49 automatisk blive skubbet ind i en stilling hvor de har anlæg mod rodendens 2 ydre periferi. Herved fordeles vægten 10 på alle fire ruller, således at risikoen for en skadelig deformation af vingeskallen minimeres. Samtidig bevirker det faktum, at alle fire ruller er i indgreb med rodendens periferi og drives af en motor, at der med sikkerhed sker en drejning af vingen, når rullerne bringes til at rotere.Each of rollers 46, 47; 48, 49 are driven by means of a gear motor 50, 51. The pivot axes 38, 39 of the lever rods 40, 41 cause a roving 2 illustrated to be punctured in FIG. 2, the rollers 46 to 49 will automatically be pushed into a position where they abut against the outer periphery of the root end 2. In this way, the weight 10 is distributed on all four rollers, so that the risk of harmful deformation of the blade shell is minimized. At the same time, the fact that all four rollers engage the periphery of the root end and are driven by a motor makes it safe to turn the blade when the rollers are caused to rotate.

Rullestativerne 34, 35 omfatter yderligere hver en fod 52,53, som er fast forbundet med 15 henholdsvis vognrammeparten 31 og vognrammeparten 32. Benet 36 er ved dets nedre ende vipbart forbundet med foden 52 og benet 37 er ved dets nedre ende vipbart forbundet med foden 53. Vippeakseme 54, 55 mellem benene 36, 37 og fødderne 52, 53 er beliggende i et diametralt plan gennem en på rodvognen 4 anbragt vinges rodende 2 og står vinkelret på benene 36, 37. Vippeaksemes 54, 55 forlængelser i nedadgående retning 20 mødes således i en punkt, som vil ligge lodret under længdemidteraksen C af en på rodendevognen anbragt vinge. Vippeakseme 54, 55 sikrer at alle milerne 46 til 49 over i hovedsagen hele deres længde vil have anlæg mod rodendens 2 periferi, selv når denne ikke er fuldstændig cylindrisk, men let konisk.The roll racks 34, 35 each further comprise a foot 52,53 which is firmly connected to the carriage frame portion 31 and the carriage frame portion 32 respectively. The leg 36 is pivotally connected to the foot 52 at its lower end and the leg 37 is pivotally connected to the foot 53. The rocker axes 54, 55 between the legs 36, 37 and the feet 52, 53 are located in a diametrical plane through a rotating blade 2 arranged on the root carriage 4 and are perpendicular to the legs 36, 37. The extensions of the rocker axes 54, 55 descend 20 thus at a point which will lie vertically below the longitudinal center axis C of a wing mounted on the rowing trolley. The rocker axes 54, 55 ensure that all of the miles 46 to 49 over their entire length will abut the periphery of the root end 2, even when it is not completely cylindrical but slightly conical.

Det skal yderligere nævnes, at der på vingerodsvognen 4 er anbragt et styreskab 56 med 25 en tilslutning for strøm, og at vingerodsvognen 4 og vingetipvognen 5 kan forbindes med et kabel, således at drejningen af milerne 46 til 49 også kan standses fra vingetipvognen 5.It should be further mentioned that on the wingtip trolley 4 a control cabinet 56 is provided with a connection for current and that the wingtip trolley 4 and the wingtip trolley 5 can be connected to a cable, so that the turning of the miles 46 to 49 can also be stopped from the wingtip trolley 5.

Claims

A carriage set for handling and transporting wind turbine blades (1) having a generally cylindrical wing tip (2) and a wing tip (3) and comprising a wing root wagon (4) 5 and a wing tip wagon (5), which wing tip wagon (5) comprises a tip wagon frame (6) with drive wheels (7) and a pivot about a horizontal axis (11) provided with a swivel ring (10) provided with a support and fastening device (17) for supporting and fastening the wing tip (3), which wing carriage (4) ) comprises a trolley frame (30) with drive wheels (33), a support device with rollers arranged on the frame (32) for support 10 of the wing root end (2), at least one of the rollers being a friction surface drive roller driven for rotation of a wing (1) arranged on the carriage set about its central longitudinal axis C, the axes (42 - 45) of the rollers (46 - 49) being substantially parallel to the central longitudinal axis C of the vane, the supporting device of the wing carriage (4) comprising two spaced apart large lever means (40, 41), in each of which 15 are spaced rotatably spaced (46, 47); 48, 49), wherein each of the barbell means (40, 41) is pivotally positioned relative to the root carriage frame (30) about a pivot axis (38, 39) which is substantially parallel to the axes of the rollers (42, 43; 44 , 45) and disposed therebetween in a direction perpendicular to the plane defined by the roll-off axis (42,43; 44,45), characterized in that at least one and preferably both bar-rod devices (40, 41) are tilted in proportion to to the trolley frame (30) about a rocker axis (54,55) to allow the at least one barbell device (40, 41) to take positions where the axes 42, 43 of the two rollers (46, 47; 48, 49) disposed therein; 44, 45 are not parallel to the axes of the rollers of the second barbell device, and the pivot axes (38, 39) of the barriers are provided at the outer ends of inclined upwardly and 25 inwardly extending from the root carriage frame (30). .

Carriage set according to claim 1, characterized in that the at least one rocker axis (54, 55. is provided at one of the lower ends of the inclined legs (36, 37). 8 DK 176328 B1

Carriage set according to claim 1, characterized in that means are provided for adjusting the distance between the two lever devices (40, 41).

Carriage set according to claim 3, characterized in that the adjusting means are constituted by the root carriage frame (32), which consists of two carriage parts (31, 32), each of which is provided with a lever bar (40, 41) and which are interconnected displaceable transversely to the axes (42, 43; 44, 45) of the rollers (46, 47; 48, 49) disposed in the lever devices (40, 41).

Carriage set according to claim 3 or 4, characterized in that the adjusting means are constituted by the inclined legs (36, 37), each of which is formed as telescoping longitudinally adjustable legs.

Carriage set according to one or more of the preceding claims, characterized in that each of the pivot axes (38, 39) of each of the lever devices (40, 41) is spaced equally spaced from the axes of its two rollers (42, 43; 44, 45). .

Carriage set according to claim 6, characterized in that each of the pivot axes (38, 39) of each of the lever devices (40, 41) is arranged in the plane defined by the axes of its rollers (42, 43; 44, 45).

7 DK 176328 B1

Carriage set according to one or more of the preceding claims, characterized in that the rollers (46, 47; 48, 49) of the lever bar (40, 41) have the same diameter. 20