DK152712B

DK152712B - CONTINUOUSLY CONTINUOUS ELEVATOR FOR UPDATE OR DOWN TRANSPORT OF ARTICLES.

Info

Publication number: DK152712B
Application number: DK042380AA
Authority: DK
Inventors: Michel Gilbert Yves Fouassier; Remi Robert Alfred Piette
Original assignee: Tissmetal Lionel Dupont
Priority date: 1979-02-12
Filing date: 1980-01-31
Publication date: 1988-04-25
Also published as: DE3063798D1; FR2448491A1; JPS55135013A; DK152712C; ES488492A0; DK42380A; ES8100207A1; JPS6011645B2; ATE3839T1; EP0015790B1; EP0015790A1; FR2448491B3

Abstract

1. Continuously operated vertical elevator, in particular for objects (P) of irregular volume, comprising an endless belt (1) and an endless surface (4) extending parallel to each other along substantially vertical runs (2, 3) on their corresponding trajectories, the endless surface being comparatively rigid, whereas the endless belt is comparatively flexible, and guided by at least one roller chain (9, 10, 11, 12, 13, 16) on whose links (16) are secured via carrying elements (14) rendered integral with the chain and having orifices (17), resilient ties (18) in unit with the flexible endless belt and placed between two longitudinal edgings held parallel to each other, characterised in that the carrying elements (14) into whose orifices (17) are inserted and held the resilient or flexible ties (18) have a surface (21) facing towards the rigid endless surface (4) which has the form of a cylindrical sector the radius of which is substantially equal to the radius of a concave joining curvature (8) situated at the foot of the vertical run (3) of the rigid endless surface (4), between this latter and a horizontal run adjacent to the rigid endless surface (4).

Description

Opfindelsen angår en kontinuerligt løbende elevator til opadgående eller nedadgående transport af genstande ad en S-formet bane og af den art, der omfatter et relativt fleksibelt, endeløst bånd og en relativt formfast flade, der over et i hovedsagen lodret afsnit af det endeløse bånds bane strækker sig i hovedsagen parallelt med og i umiddelbar nærhed af nævnte afsnit, og hvor det endeløse bånd med elastiske strammeorganer strammes ud mellem holdere, der har forbindelse med de enkelte led af mindst én med ruller udstyret drivkæde, og hvor de enkelte transporterede genstande placeres mellem båndet og nævnte flade.BACKGROUND OF THE INVENTION The invention relates to a continuous running elevator for upward or downward transport of objects along an S-shaped web and of the type comprising a relatively flexible, endless web and a relatively mold-resistant surface, which over a substantially vertical section of the web of the endless web extending substantially parallel to and in the immediate vicinity of said section, wherein the endless band of resilient tensioning means is extended between holders connected to the individual joints of at least one roller-driven drive chain, and the individual conveyed articles being placed between the band and said surface.

Man kender elevatorer af den indledningsvis nævnte art fra beskrivelserne til US-PS nr. 3.819.030 og FR-PS nr. 1.380.653.Elevators of the kind mentioned above are known from the descriptions of US-PS No. 3,819,030 and FR-PS No. 1,380,653.

I den konstruktion, man kender fra US-PS nr. 3.819. 030, er forbindelsen mellem det fleksible, endeløse bånd og dens holdere tilvejebragt ved hjælp af f.eks. fjedre, der i den ene ende har forbindelse med elastiske snore og i den anden ende har forbindelse med L-formede holdere, der styres i skinner.In the construction known from US PS 3,819. 030, the connection between the flexible endless band and its holders is provided by e.g. springs connected at one end to elastic cords and at the other end connected to L-shaped rails guided in rails.

I den konstruktion, man kender fra FR-PS nr. 1.380. 653, udgøres det fleksible, endeløse bånd af en fleksibel dug, hvis kanter har forbindelse med endeløse drivkæder.In the construction known from FR-PS No. 1,380. 653, the flexible, endless band is constituted by a flexible cloth whose edges are connected to endless drive chains.

Sædvanligvis omfatter elevatorer af denne art et vandret afsnit afsnit i den nederste ende af det vertikale transportafsnit, med en buet overgang mellem nævnte to afsnit. Ligeledes er der i den øvre ende af det vertikale transportafsnit en buet overgang til et vandret afsnit. Normalt støttes et transportbånd af underliggende styrevalser, men for et transportbånd af den her omtalte art, hvor selve båndet deformerer sig og om de enkelte transporterede genstande danner en slags lomme og presser genstandene mod den modsvarende, relativt formfaste flade med en kraft, der direkte afhænger af genstandens størrelse, er det vanskeligt på den konkave side af en sådan buet overgang at understøtte og styre det fleksible bånd, eftersom man netop på grund af denne lommedeformation af båndet ikke kan anvende de sædvanlige tværgående båndstøtte- og styrevalser i den side, hvor denne lomme forekommer.Usually, elevators of this kind comprise a horizontal section section at the lower end of the vertical transport section, with a curved transition between said two sections. Likewise, at the upper end of the vertical transport section there is a curved transition to a horizontal section. Normally, a conveyor belt is supported by underlying guide rollers, but for a conveyor belt of the kind referred to herein, where the belt itself deforms and whether the individual conveyed articles form a pocket and press the objects against the corresponding, relatively solid surface with a force which depends directly of the size of the object, it is difficult on the concave side of such a curved transition to support and guide the flexible belt, because precisely because of this pocket deformation of the belt, the usual transverse band support and guide rollers cannot be used in the side where this pocket occurs.

Opfindelsen tager sigte på at afhjælpe disse vanskeligheder, og med henblik herpå er en elevator ifølge opfindelsen ejendommelig ved, at holdernes mod nævnte relativt formfaste flade vendende side er en cylinderflade med akse i hovedsagen vinkelret på det endeløse bånds bevægelsesretning og med radius i hovedagen lig med radien af en konkav overgang for det endeløse bånd mellem foden af nævnte relativt formfaste flades lodrette afsnit og et hosliggende vandret afsnit af nævnte relativt formfaste flade.The invention aims to alleviate these difficulties, and for this purpose an elevator according to the invention is characterized in that the holders facing said relatively shaped fixed surface are a cylindrical surface with axis generally perpendicular to the direction of movement of the endless belt and with radius in the main axis equal to the radius of a concave transition for the endless band between the foot of said relatively sectional surface of said relatively solid surface and an adjacent horizontal section of said relatively shaped surface.

Med sådanne holdere har man mulighed for at styre begge kanter af det fleksible transportbånd uden behov for anden understøtning eller styring på den konkave side af den buede overgang fra vandret afsnit til i hovedsagen lodret transportafsnit.With such holders, it is possible to control both edges of the flexible conveyor belt without the need for other support or control on the concave side of the curved transition from horizontal section to substantially vertical transport section.

I det tilfælde, hvor den nævnte relativt formfaste flade udgøres af et relativt stift, endeløst bånd, der ved hjælp af drivvalser drives med i hovedsagen samme lineære hastighed som nævnte relativt fleksible, endeløse bånd i nævnte indbyrdes parallelle, lodrette afsnit, kan nævnte holdere være indrettet til i hvert fald inden for nævnte konkave overgang med deres cylinderflade at udøve tryk mod det relativt stive, endeløse bånd. Herved kan det fleksible transportbånds holdere også benyttes til i den buede overgang at styre det relativt stive transportbånd, hvorved konstruktionen i denne overgang forenkles væsentligt.In the case where said relatively shaped fixed surface is constituted by a relatively rigid, endless belt driven by drive rollers at substantially the same linear speed as said relatively flexible, endless bands in said mutually parallel vertical sections, said holders may be arranged to at least, within said concave transition with their cylinder surface, exert pressure against the relatively rigid, endless belt. In this way, the holders of the flexible conveyor belt can also be used to control the relatively rigid conveyor belt in the curved transition, thereby greatly simplifying the structure of this transition.

Opfindelsen forklares nærmere i det følgende under henvisning til den skematiske tegning, hvor fig. 1 viser en udførelsesform for en elevator ifølge opfindelsen, fig. 2 et snit gennem en del af elevatorbåndet ved dets ene sidekant, fig. 3 og 4 henholdsvis ovenfra og nedenfra et opspændings s tykke til elevatorbåndet, og fig. 5 en anden udførelsesform for elevatoren i-følge opfindelsen.The invention is explained in more detail below with reference to the schematic drawing, in which fig. 1 shows an embodiment of an elevator according to the invention; FIG. 2 is a section through a portion of the elevator conveyor at its one side edge; FIG. 3 and 4, respectively, from above and from below, a clamping thickness of the elevator belt; and FIG. 5 shows another embodiment of the elevator according to the invention.

Fig. 1 viser en kontinuerligt løbende elevator, uden dog at vise de bjælker eller chassiser, der tjener til at understøtte båndene, og kun med enkelte båndspæn-deruller og -valser. Denne elevator omfatter et elevatorbånd 1, der over en sektion 2 løber parallelt og praktisk taget i kontakt med et endeløst bånd 4 langs dette bånds sektion 3. En motor 5 og et sæt ikke-vis-te føreruller driver elevatorbåndet 1 i højredrejende bevægelse, medens båndet 4 drives i venstredrejende bevægelse med samme hastighed ved en drivforbindelse som antydet ved en stiplet streg 6 eller alene på grund af det tryk, der udøves af de genstande, som skal transporteres, plus den driveffekt, der hidrører fra de elementer, der opretholder båndets konkavitet. I sidstnævnte tilfælde er båndet frit bevægeligt over valserne, eftersom det er ønskeligt, at båndene over sektionerne 2 og 3 bibringes i hvert fald nogenlunde den samme hastighed i den samme retning således, at der mekanisk fås en tvangstyret aktivering uden glidning.FIG. 1 shows a continuously running elevator, without, however, showing the beams or chassis which serve to support the belts, and only with a few belt tensioner rollers and rollers. This elevator comprises an elevator belt 1 running across a section 2 parallel and practically in contact with an endless belt 4 along the section 3. of this belt. A motor 5 and a set of unseen driver rollers drive the elevator belt 1 in a right-hand motion, while the belt 4 is operated in the left-hand motion at the same speed at a drive connection as indicated by a dashed line 6 or solely because of the pressure exerted by the objects to be transported, plus the drive power resulting from the elements maintaining the belt concavity. In the latter case, the belt is freely movable over the rollers, since it is desirable that the belts above sections 2 and 3 are provided at least at approximately the same speed in the same direction so as to mechanically provide a forced-controlled activation without slipping.

Det endeløse bånd 4 føres over valser 7, som har til formål at bibringe båndet en vis stramning, idet dette bånd i elevatoren ifølge opfindelsen ikke har til formål at bringe genstandene med sig, men kun til formål at danne en referenceflade. I så henseende er der ikke behov for styring. Genstandene P føres ind i elevatoren, forneden mellem båndene 1 og 4. På grund af båndet l's fleksibilitet er pakken så at sige omsluttet af båndet 1. Det problem dernu opstår er i sektion 8, at opretholde en konkav overgang på båndet 4, eftersom dette bånd af sig selv ikke kan holdes stramt.The endless belt 4 is passed over rollers 7, which are intended to impart some tension to the belt, since this belt in the elevator according to the invention is not intended to carry the objects, but only for the purpose of forming a reference surface. In this regard, there is no need for governance. The items P are brought into the elevator at the bottom between the belts 1 and 4. Due to the flexibility of the belt 1, the package is, so to speak, enclosed by the belt 1. The problem then arises in section 8 is to maintain a concave transition on the belt 4, since this ties of themselves cannot be held tight.

Det er elevatorbåndet 1, der i dette område presser på kanterne af båndet 4 for herved at opretholde den ønskede konkavitet af dette bånd. Hvis man ønskede, at båndet 4 alene skulle presses af båndet 1 i dette område, ville det være nødvendigt at tilvejebringe store trykkræfter over hele bredden af båndet 1 med risiko for at en skrøbelig genstand mere eller mindre presses flad. I den her beskrevne konstruktion dissocieres båndet 4's holdefunktion i den konkave sektion ved anlæg af båndet 4 mod holdere, der bærer strammeorganer og som skal beskrives nærmere senere, fra lastholdefunktionen, som opnås ved hjælp af strammeorganer, der er tilknyttede nævnte holdere.It is the elevator belt 1 which in this area presses on the edges of the belt 4 in order to maintain the desired concavity of this belt. If the belt 4 were to be pressed alone by the belt 1 in this area, it would be necessary to provide high compressive forces over the entire width of the belt 1, with the risk that a fragile object will more or less be pressed flat. In the construction described herein, the holding function of the belt 4 in the concave section by abutment of the belt 4 against brackets carrying tension members and to be described later is dissociated from the load holding function which is obtained by means of tension members associated with said brackets.

Medens den ovenfor givne beskrivelse har relation til en elevator, hvor genstandene, som indføres forneden, transporteres opad over en højdeforskel svarende til længden af sektionerne 2 og 3, kan man ved at lade båndene køre den anden vej også bruge elevatoren til at transportere genstandene i nedadgående retning. Et væsentligt moment i anlæggets funktion er indføringen af genstandene i elevatoren. Forneden divergerer båndene fra hinanden således, at det først er genstandens øvre forkant, der kommer i anlæg mod båndet 1. Hvis der er for stor stramning af dette bånd, er der risiko for at genstanden vipper om en vandret akse. Når der er tale om en elevator til store genstande, kan man øge afstanden mellem de to grene af båndet 1 i den ne-derste del af elevatoren, således at genstandene kommer mere progressivt i berøring med båndet 1. I så henseende er der dog den begræsning, at man ønsker mindste gulvplads for elevatoren.While the above description relates to an elevator in which the objects introduced below are transported upward over a height difference corresponding to the length of sections 2 and 3, by allowing the bands to run the other way, the elevator can also be used to transport the objects in downward direction. An important step in the operation of the system is the introduction of the objects into the elevator. Below, the straps diverge so that it is only the upper leading edge of the article that abuts the strap 1. If there is too much tightening of the strap, there is a risk that the article will tilt over a horizontal axis. In the case of a lift for large objects, the distance between the two branches of the belt 1 in the lower part of the elevator can be increased, so that the objects come into contact with the belt more progressively. restriction that one wants the minimum floor space for the elevator.

I denne elevator kommer de fornødne kræfter til løftning af genstandene for det meste fra elevatorbåndet 1. Derfor må dette bånd være udformet således, at det kan tåle disse kræfter. Elevatorbåndet 1 drives og styres af mindst én kæde, der er forbundet med båndet ved hjælp af Cardan-ophæng af den art, der er beskrevet i fransk patent nr. 1.182.570. Fig. 2 er et vandret delsnit. I henhold til en udførelsesform er der ved hver sidekant af båndet 1 to køreskinner, hvoraf én enkelt er vist i fig. 2. Hver skinne består af to Ω-for-mede profiler 9 og 10 med parallelle, bort fra hinanden vendende kantflader, der er forbundet med elevatorens stativ. I disse skinneprofiler 9 og 10 kører to par indbyrdes ortogonale ruller, der er forbundet med drivkædens led. De to ruller 11 kører inden i skinneprofilerne, medens de to ruller 12 kører på skinneprofilernes udadrettede kantflanger. De fire ruller er parvis forbundet med hinanden ved hjælp af afstandsstykker, såkaldte led, der er sammenkoblede gennem Cardan-led 13. På hvert led 16 er der fastboltet en holder 14 for strammeorganer, hvilken holder rager indad i forhold til båndets kant. Det er kendt at Car-dan-monteringen af holderen 14 på kæden giver denne kæde mulighed for nemt at følge skinnernes forløb. En bolt 15 er ført gennem kædeleddet 16 og giver mulighed for justering af holderen 14 på kæden. Holderen 14 har flere huller 17, hvori der indsættes enderne af strammeorganer 18, der udgøres af elastiske snore. På samme måde som beskrevet i fransk patent nr. 2.088.076 kan strammeorganerne være indlagt i en fleksibel dug, der består af to fleksible lag 19 og 20.In this elevator, the necessary forces for lifting the objects mostly come from the elevator belt 1. Therefore, this belt must be designed so that it can withstand these forces. The elevator belt 1 is operated and controlled by at least one chain connected to the belt by means of Cardan suspension of the kind described in French Patent No. 1,182,570. FIG. 2 is a horizontal sectional view. According to one embodiment, at each side edge of the belt 1 there are two running rails, one of which is shown in FIG. 2. Each rail consists of two Ω-shaped profiles 9 and 10 with parallel, mutually facing edge surfaces connected to the elevator stand. In these rail profiles 9 and 10, two pairs of mutually orthogonal rollers connected to the drive chain joints. The two rollers 11 run within the rail profiles, while the two rollers 12 run on the outward edge flanges of the rail profiles. The four rollers are connected in pairs by means of spacers, so-called joints, which are interconnected through Cardan joints 13. On each joint 16 there is fastened a retaining means 14 for tensioning means, which holds inwards relative to the edge of the belt. It is known that the Car-dan mounting of the holder 14 on the chain allows this chain to easily follow the course of the rails. A bolt 15 is passed through the chain link 16 and allows the holder 14 to be adjusted on the chain. The holder 14 has a plurality of holes 17 in which the ends of the tensioning means 18 are constituted by elastic cords. In the same way as described in French Patent No. 2,088,076, the tensioning means may be housed in a flexible tablecloth consisting of two flexible layers 19 and 20.

Fig. 3 og 4 viser holderen set henholdsvis nedenfra og ovenfra. Holderen har fire huller 17, hvori man kan indsætte enderne af strammesnorene uden at skulle bruge kroge, der i denne type apparat ikke er tilstrækkelig solide. Disse huller har konisk facon både foroven, hvor man folder enden af snoren 18 tilbage, og forneden, som vist ved ' 17a, for at snoren frit kan bevæge sig uden at komme i anlæg mod en skarp kant, der hurtigt ville såre snoren. I øvrigt har snoren kun anlæg mod kanten 17a, når den ikke er spændt, dvs. når trykket er svagt. Når der er en pakke af store dimensioner, der skal transporteres, søger snoren at placere sig på aksen gennem hullet 17. Holderen 14's underside 21 er krum med krumningsradius lig med krumning s rad i en i den konkave overgangssektion 8 af elevatoren. Holderen har huller 22 for boltene 15 med hvilke holderen påmonteres driv- og styrekæden. Holderen består fortrinsvis af støbt letmetal. Med disse holdere 14 kan kanterne af elevatorbåndet 1 hele vejen langs sektionerne 2 og 3 presses mod holdebåndet 4, hvilket også bevirker, at genstandene, medens de transporteres opad, styres i forhold til båndkanterne. Holdebåndet 4 har en vis stivhed i tværretningen og kan f.eks. være det bånd, der i handelen kendes under betegnelsen "Dunloflex TD 200/3” fra firmaet DUNLOP.FIG. 3 and 4 show the holder seen from below and from above, respectively. The holder has four holes 17 in which one can insert the ends of the tightening cords without having to use hooks, which in this type of apparatus are not sufficiently solid. These holes have a conical shape both at the top, where the end of the cord 18 is folded back, and the bottom, as shown at '17a, so that the cord can move freely without touching a sharp edge that would quickly injure the cord. Incidentally, the cord only has contact with the edge 17a when it is not tensioned, ie. when the pressure is weak. When there is a package of large dimensions to be transported, the string seeks to place on the axis through hole 17. The underside 21 of the holder 14 is curved with radius of curvature equal to curvature radius in one in the concave transition section 8 of the elevator. The holder has holes 22 for the bolts 15 with which the holder is mounted on the drive and steering chain. The holder preferably consists of cast light metal. With these holders 14, the edges of the elevator belt 1 can be pressed all the way along sections 2 and 3 against the holding belt 4, which also causes the objects, while being transported upwards, to be controlled relative to the belt edges. The holding band 4 has some stiffness in the transverse direction and can e.g. be the band known commercially under the designation "Dunloflex TD 200/3" from the company DUNLOP.

Som det fremgår af fig. 1 dannes der på elevatorbåndet 1 en slags lomme, der omgiver genstanden uden at presse den flad, eftersom båndets elastiske deformation er proportional med genstandens størrelse.As shown in FIG. 1, a kind of pocket is formed on the elevator belt 1 which surrounds the object without pressing it flat since the elastic deformation of the belt is proportional to the size of the object.

Det bemærkes, at den maksimale højde, genstandene kan have, er afstanden H mellem elevatorbåndets to grene i den øvre del af elevatoren.It should be noted that the maximum height the objects can have is the distance H between the two branches of the elevator belt in the upper part of the elevator.

Fig. 5 viser en anden udførelsesform, hvor den aktive gren 3 af styrebåndet 3 løber langs grenen 2 af elevatorbåndet 1 og fastholdes af holdere 14 på samme måde scan i den foregående udførelsesform. Disse holdere 14 er dog påmonteret U-formede bøjler 23 med benlængde større end højden af den største genstand, der kan transporteres på denne elevator. I denne udførelsesform er der kun behov for én enkelt drivkæde 24, hvilket gør anlægget billigere.FIG. 5 shows another embodiment in which the active branch 3 of the control belt 3 runs along the branch 2 of the elevator belt 1 and is held by holders 14 in the same manner scan in the previous embodiment. However, these holders 14 are mounted on U-shaped shackles 23 with leg length greater than the height of the largest object transportable on this elevator. In this embodiment, only a single drive chain 24 is needed, which makes the system cheaper.

Den fleksibilitet, hvormed kæden kan bruges, giver endvidere mulighed for at ændre banen for pressebåndet, der kan cirkulere i flere planer. Pressebåndet kan også cirkulere med én enkelt drivkæde såfremt båndet er formet som et Mobius-bånd.Furthermore, the flexibility with which the chain can be used allows for changing the path of the press belt, which can circulate in several planes. The press belt can also circulate with a single drive chain if the belt is shaped like a Mobius belt.

Claims

1. Kontinuerligt løbende elevator til opadgående eller nedadgående transport af genstande (P) ad en S-formet bane og af den art, der omfatter et relativt fleksibelt, endeløst bånd (1) og en relativt formfast flade (4), der over et i hovedsagen lodret afsnit (2) af det endeløse bånds (1) bane strækker sig i hovedsagen parallelt med og i umiddelbar nærhed af nævnte afsnit, og hvor det endeløse bånd (1) med elastiske strammeorganer i (18) strammes ud mellem holdere (14), der har forbindelse med de enkelte led (16) af mindst én med ruller (11, 12) udstyret drivkæde, og hvor de enkelte transporterede genstande (P) placeres mellem båndet (1) og nævnte flade (4), kendetegnet ved, at holdernes (14) mod nævnte relativt formfaste flade (4) vendende side er en cylinderflade (21) med akse i hovedsagen vinkelret på det endeløse bånds (1) bevægelsesretning og med radius i hovedsagen lig med radien af en konkav overgang (8) for det endeløse bånd (1) mellem foden af nævnte relativt formfaste flades (4) lodrette afsnit (3) og et hosliggende vandret afsnit af nævnte relativt formfaste flade (4).A continuous running elevator for the upward or downward transport of articles (P) along an S-shaped web and of the type comprising a relatively flexible, endless band (1) and a relatively mold-resistant surface (4) extending over an the substantially vertical portion (2) of the path of the endless band (1) extends substantially parallel to and in the immediate vicinity of said section, and wherein the endless band (1) with elastic tension means in (18) is stretched out between holders (14) associated with the individual joints (16) of at least one drive chain equipped with rollers (11, 12) and wherein the individual conveyed articles (P) are positioned between the belt (1) and said surface (4), characterized in that: facing side of said relatively shaped solid surface (4) is a cylindrical surface (21) with axis substantially perpendicular to the direction of movement of the endless belt (1) and having radius substantially equal to the radius of a concave transition (8) for it. endless strips (1) between the foot of said relatively shaped surfaces ( 4) a vertical section (3) and an adjacent horizontal section of said relatively shaped surface (4).

2. Elevator ifølge krav 1, hvor den nævnte relativt formfaste flade (4) udgøres af et relativt stift, endeløst bånd, der ved hjælp af drivvalser (7) drives med i hovedsagen samme lineære hastighed som nævnte relativt fleksible, endeløse bånd (1) i nævnte indbyrdes parallelle, lodrette afsnit (2, 3), kendetegnet ved, at nævnte holdere (14) er indrettede til i hvert fald inden for nævnte konkave overgang (8) med deres cylinderflade (21) at udøve tryk mod det relativt stive, endeløse bånd (4).Elevator according to claim 1, wherein said relatively shaped solid surface (4) is constituted by a relatively rigid endless belt driven by drive rollers (7) at substantially the same linear speed as said relatively flexible endless belt (1). in said mutually parallel vertical sections (2, 3), characterized in that said holders (14) are adapted to exert pressure at least within said concave transition (8) with their cylinder surface (21) against the relatively rigid, endless bands (4).

3. Elevator ifølge krav 1 eller 2, kendetegnet ved, at holderne (14) er påmonteret enderne af U-formede organer (23), der har forbindelse med én enkelt drivkæde (24).Elevator according to claim 1 or 2, characterized in that the holders (14) are mounted on the ends of U-shaped means (23) which are connected to a single drive chain (24).