EP0913353A1 - Modular construction of elevator installation - Google Patents

Abstract

The cage (2) has a fixed point (9) to which the end of the cable opposite to the counterweight is attached. The cage and counterweight run in guides such that the guide for the cage is located on one side of the cage in the frame (5) of the lift shaft. The guide preferably comprises two guide rails (11). these rails are formed by T-sections (13) along which the cage is guided on one side.

Description

The invention relates to an elevator system with a car, one with this at least one cable connected counterweight and a modular buildable Elevator scaffold, in which car and counterweight along guides are movable, the cable pull at least on its opposite the counterweight End is attached to a fixed point.

Such an elevator installation is known from practice, in which in an elevator shaft preferably an elevator scaffold that can be assembled in a modular manner is introduced from above. The elevator frame is essentially spaced apart by two pairs Guide rails formed as guides that are approximately perpendicular to each other in the elevator shaft be attached. A couple assigned to a wall of the elevator shaft are used to guide a counterweight. The other couple, centered and extend across the elevator shaft, serves to guide a car. Counterweights and the car are connected to each other via a cable pull, preferably of several cables connected. The cable is at an upper end of the guide rails for the counterweight and at an upper end of the guide rails for the car attached to a fixed point. There is a pulley above the counterweight and below the car there is also at least one deflection roller for deflection arranged of the cable. At the top of a pair of guide rails is also a traction sheave driven by a motor is arranged around which the cable pull is at least partially put around to drive it.

The elevator system previously known in practice has a relatively complex structure, for example one or two pulleys for the cable are arranged on the car and a total of two fixed points must be formed on the elevator scaffold. Furthermore are the guide rails for both the counterweight and the car on both sides arranged, making the installation of the elevator system more expensive and becomes more time consuming.

The subject of the registration is based on the elevator system described at the beginning based on the task, the installation and work effort to set up an elevator system with a simpler construction.

This object is achieved in that the fixed point is formed on the car and the the guide assigned to the car is arranged on one side of the car in the elevator frame is.

Due to the design of the fixed point directly on the car, complex storage is possible one or more deflection rollers on an underside of the car are dispensed with become. In addition, no additional safety devices have to be installed through which the cable pulls out of the car Deflection pulley is prevented or at least checked. Through training The guidance for the car only on one side to the car reduces the installation and work effort and at the same time the overall system is cheaper.

In a further elevator system known from practice, a car without Counterweight used. The elevator scaffold is arranged on both sides of the elevator car vertical pylons or the like are formed. These can be modular up to one required height can be composed of subunits. On a bottom of the car, a drive device with a pair of friction wheels is arranged. In each case, a friction wheel rests on one side of a pylon, with each being opposite presses another friction wheel on the opposite side of the respective pylons. The other friction wheels are also rotatably mounted on the underside of the car.

In this known elevator system it is disadvantageous that the driving ability and the load capacity of the elevator car compared to a cable-operated elevator system is less. Furthermore, there are complex emergency braking devices and control devices necessary to prevent the car from falling on the one hand and on the other hand an exact approach to floors is possible. Overall, one is Elevator system cannot be compared to a cable-operated elevator system.

In order to obtain a simple guide for the car, it can consist of two guide rails be formed, along which the car is guided on one side.

Such guide rails can preferably be made of a T-profile and facing one another T-bars should be formed. The car is guided along the T-bars, for example can press guide wheels on both sides of a T-bar. The T-bars are usually used for emergency braking of the car at the same time.

To fasten the guide rails directly to the elevator frame can, the guide rails can be spaced in the vertical direction in the elevator frame arranged U-brackets can be releasably attached.

A simple and sufficiently stable construction of the elevator scaffold or an elevator scaffold module results, for example, from the fact that at least one elevator scaffold module has essentially vertical corner stands and cross struts connecting them. Corner stands and cross struts can be tubular with a round or angular and in particular square cross section. Corner stands and cross struts are preferred made of steel or another similarly stable material. Such materials are also sufficiently resistant to corrosion, whereby they increase further corrosion resistance can also be surface treated.

To attach the corner stands at their lower and upper ends in a simple manner To be able to, the elevator scaffold a lower floor element and / or an upper Have cover element to which the corner stands are releasably attached. For example by screwing or the like. Floor element and ceiling element also increase inherent stability by fastening with the corner stands of the elevator scaffold.

As a rule, an elevator system is arranged so that its lower end in a Pit located below the level of a bottom access to the elevator system is. Furthermore, the elevator system extends to above the highest access or top floor. To assemble the elevator scaffold from modules accordingly To be able to do this, as elevator scaffold modules, at least one pit module, have a floor module and a ceiling module. The pit module extends for example up to the entry level of the lowest access. Then follow one corresponding number of floor modules. A floor module can, for example have a height corresponding to two, three or more floors. Furthermore, each floor module can only be accessed from the entry level Extend the floor to the entry level of the floor above. Finally the ceiling module connects to the top floor module. As with installations of elevator systems the height of the entire system is generally known beforehand, the ceiling module can also be designed as a combination of a floor and ceiling module be, for example, from the entry level of the top floor extends upwards.

In order to be able to easily attach a U-bracket to the elevator frame, such a bracket can be arranged on a cross strut. This can be done by screwing Welding or the like take place.

A floor module can be used to further simplify the installation of the elevator system have a floor access door directly. This is movably supported in the elevator frame. In this context, it should be noted that the entire elevator electronics continue can also be delivered pre-assembled with the elevator system can, so that, for example, only corresponding ones in the area of the floor access doors Connections between the elevator electronics and those located on each floor Control buttons must be made.

To further simplify the installation of the elevator system, buffers for counterweight and / or car and / or a drive motor with a traction sheave on the Bottom element may be arranged so that it is already pre-assembled for installation can be transported.

In an analogous manner, pulleys for the cable can be attached to a cross member in the elevator scaffold and / or be rotatably mounted on the ceiling element. About these pulleys the cable pull becomes on the one hand from the drive motor to the fixed point on the car and on the other hand to the fixed point on the counterweight.

Just like the guide for the car, the guide for the counterweight can have two guide rails, in particular on an outside of a U-leg of the U-bracket are releasably attached. For example, one Outside of a U-leg two guide rails can be releasably attached with their Assign T-bars to each other.

In order to be able to fasten the car in a simple manner with the cable, the Fixed point as a fixed point beam projecting essentially vertically from a car wall be formed, on which a car end of the cable is releasably attached. The The length of the fixed point beam is usually determined so that the cable is essentially vertically between the corresponding deflection roller and attachment point on the fixed point bracket runs.

In order to be able to easily attach the cable to the counterweight, too a mounting insert for detachable fastening on an upper side of the counterweight the counterweight end of the cable can be arranged. This can also be designed in this way be that the cable between the associated pulley and attachment point runs essentially vertically on the mounting insert. You can also the pulleys and the corresponding attachment points on the fixed point bracket or Assembly insert can be arranged in one plane, preferably vertically between one Car wall and one side of the elevator scaffold runs. At this level you can also preferably be arranged the traction sheave.

To the at the point of attachment between the cable and car or counterweight A spring element can dampen the effects of force at the cable ends be arranged. This can be done in such a way that the cable pull through a hole is passed through in the fixed point support or assembly insert and between the actual one Cable end and the fixed point carrier or the mounting insert between this and the respective ends of the cable supporting spring element arranged is.

Each guide rail can be attached to U-brackets to simplify the assembly of the elevator system and / or detachable on the base element and / or cover element by means of fastening angles be attached.

In order to be able to precisely determine the respective position of the car in a simple manner, often becomes a rotating one above and below in the elevator shaft over disks and regulator rope attached to the car. Such a regulator rope can be used for Subject of application can also be used in a simple manner, one Controller console for the rotatable mounting of a controller cable drum on the outside a U-leg of a U-bracket or on a T-beam of a guide rail in particular is releasably attached in the area of the ceiling module. Another regulator rope drum can be attached in an analogous manner in the pit module or on the floor element be.

A simple guidance of the car and the counterweight can advantageously be realized by if car and / or counterweight guide shoes with guide slots have, with a T-web of a guide rail at least in each guide slot is partially inserted. In addition, the guide shoes can also be used as emergency braking devices be formed by a crash or the like Narrowing the guide slot frictional engagement with the T-bar for braking the car and / or the counterweight.

A corresponding emergency braking device can also be used elsewhere and in a similar manner Be constructed in such a way.

To a large extent on supporting the elevator scaffold in an elevator shaft To be able to do without, the elevator scaffolding and each corresponding module can be self-supporting be trained. An elevator installation in Elevator shafts or buildings are installed that are not otherwise suitable Loads are designed. The self-supporting elevator frame is only on the side attached in the elevator shaft, so that essentially only forces perpendicular to the direction of travel the elevator car exerted on the elevator shaft surrounding the elevator frame become.

The elevator installation according to the invention can also be used entirely without an elevator shaft their self-supporting elevator scaffold, which may only be that Pit module in a corresponding pit below the lowest access level for the elevator system is arranged. In such a case, it is used to cover the elevator scaffold of advantage if on this bracket for releasable attachment of in particular see-through cladding arranged on cross struts and / or corner stands are. When using such transparent coverings as glass surfaces or the like, there is also an optically impressive elevator system, such as nowadays they are often found in shopping centers, department stores, restaurants or the like is used.

For reasons of vibration suppression, particularly in the area of the drive device it is also advantageous if a vibration plate for storing the Drive motor with gear can be arranged on the floor element. By any vibrations that occur are damped and only slightly transfer the elevator scaffold and possibly the car.

A reduction in the time to install the elevator and a reduction in Installation costs can still be achieved in that each module already has guide rails is pre-assembled. The pre-assembly can also be done by attaching the rotating rollers, the floor access doors, the buffer for counterweights and car, the drive motor etc. include.

In the following an advantageous embodiment of the invention based on the in the Drawing accompanying figures explained and described.

Fig. 1

einen Vertikalschnitt durch eine erfindungsgemäße Aufzugsanlage;

Fig. 2

einen Schnitt entlang der Linie II-II aus Fig. 1;

Fig. 3

einen weiteren Schnitt analog zu Fig. 2 insbesondere im Bereich einer Stockwerkzugangstür, wobei der Vertikalschnitt nach Fig. 1 einem Schnitt entlang der Linie I-I aus Fig. 3 entspricht;

Fig. 4

einen weiteren Schnitt analog zu Fig. 2 und 3 im Bereich eines Grubenmoduls;

Fig. 5

einen Schnitt entlang der Linie V-V aus Fig. 4;

Fig. 6

einen Schnitt entlang der Linie VI-VI aus Fig. 4, und

Fig. 7

eine vergrößerte Darstellung eines U-Bügels zur Halterung von Führungsschienen.

Show it:

Fig. 1

a vertical section through an elevator system according to the invention;

Fig. 2

a section along the line II-II of Fig. 1;

Fig. 3

2 shows a further section analogous to FIG. 2, in particular in the area of a floor access door, the vertical section according to FIG. 1 corresponding to a section along line II from FIG. 3;

Fig. 4

another section analogous to Figures 2 and 3 in the area of a pit module.

Fig. 5

a section along the line VV of Fig. 4;

Fig. 6

a section along the line VI-VI of Fig. 4, and

Fig. 7

an enlarged view of a U-bracket for holding guide rails.

1 shows a vertical section through an elevator installation 1 according to the invention. This comprises at least one pit module 19, one floor module 20 and one Ceiling module 21. The modules form an elevator scaffold 5, which is self-supporting is.

The elevator scaffold 5 and thus the individual modules 19, 20, 21 are made of corner stands 15 and these connecting cross struts 16 are formed. The corner stand 15 extend from a bottom element 17 closing the pit module 19 down to one the ceiling module 21 closing the ceiling element 18.

The floor element 17 is constructed essentially like a platform, the corresponding ones Platform sides are formed from supports, which are upwards by an end plate Are completed.

The ceiling element 18 can be constructed in a similar manner, with the floor element 17 and ceiling element 18 are releasably connected to the ends of the corner stand 15. The Connection between corner stands and these elements is made, for example, via Brackets or the like, which are not shown for simplicity.

The corner stands 15 can be installed in an elevator shaft Elevator system each extend over the height of the individual modules. The ends of the Corner stands are then connected to one another in a corresponding manner. However, it is also possible, the corner stand already over the entire height of the elevator system pre-assembled and equipped with the cross struts at an installation point for the elevator system to transport and install there, as it is especially for outside so-called glass elevators arranged in a building or within a building is an advantage.

As a rule, only the pit module 19 is below a lowest access level Elevator system arranged in a pit. The pit module has a pit ladder 59 on. This is used for maintenance, for example, to mount one on the base element 17 Drive motor 25 reachable. The drive motor 25 also has a not shown Gear on and drives a traction sheave 26, of which a cable 3 with sufficient Driving ability is driven. Buffers 23 are also in the pit module 19 and 24, see Fig. 5, arranged for a counterweight 4 and a car 2.

In the position of the counterweight shown in FIG. 1, this is except for the buffer 23 lowered.

On an upper side 36 of the counterweight 4 is a counterweight end 38 of the cable 3 attached. The cable extends essentially vertically from this end up to adjacent to the ceiling element 18. There is the cable 3 around a pulley 28 substantially semicircular and then runs vertically downwards in the direction of the traction sheave 26 essentially wrapped in a semicircle and then the cable 3 runs vertically up to a second pulley 27. This is together with the other Deflection roller 28 by means of a cross member 50 in the ceiling module 21 directly below of the ceiling element 18 rotatably mounted. The cable 3 wraps around the deflection roller 27 also essentially semicircular and from there is vertically down to Car 2 out where the cable 3 is releasably attached with its car end 8. The Fastening point between car end 8 and car forms a fixed point 9, see Fig. 3. An analog fixed point is achieved by fastening the counterweight end 38 formed on the top 36 of the counterweight 4.

U-brackets 14 are fastened to cross struts 16 on one side of the elevator frame 5, see also the following figures and in particular Fig. 7. By means of this U-bracket 14 guides 6, 7 are held for car 2 and counterweight 4. The guide 6 for the car 2 has two guide rails 10, 11 which extend from the floor element 17 extend to a cross strut 16 in the ceiling module 21. Stand over this cross strut the guide rails upwards in the direction of the ceiling element 18. Also on U-bracket is that of two guide rails 29, 30, see also the following figures, formed guide 7 attached to the counterweight 4. The guide rails 29, 30 extend parallel to and over the same height as the guide rails 10, 11. Mounting brackets 39, 40 are used to fasten the guide rails, see for example Fig. 7, by means of which the guide rails 10, 11 and 29, 30 on the different U-brackets 14 are releasably attached.

Above the car 2 there is also a controller console 41 for rotatable mounting a regulator cable drum 42 releasably attached. The attachment of the controller console 41 can also on a U-bracket 14, on the guide 6 or directly on a cross strut 16 respectively. About the regulator cable drum 42 and an analog, not shown and on Base element 17 rotatably mounted further cable drum, the control cable 60 is guided around. This is attached to car 2.

FIG. 2 shows a section along the line II-II from FIG. 1. It is special can be seen that corresponding floor access doors 22, see also Fig. 1, inside of the elevator scaffold 5 are arranged. Above the car 2 is the Cross member 50 for rotatably mounting the two deflection rollers 27, 28 arranged extends between two opposite cross struts 16 and with this over Stiffening ribs 58 is attached. The cross member 50 is spaced apart by two Half carrier formed, between which the deflection rollers 27, 28 are arranged. Below the cross member 50, a U-bracket 14 is visible, which with its U-web 57 runs parallel to a cross strut 16 and is fastened to it. The corresponding U-legs protrude vertically from U-web 57 in the direction of car 2.

FIG. 3 shows a further section analogous to FIG. 2 through the elevator installation according to FIG. 1 shown in particular in the area of the doors 22, 55. The same reference numerals according to Fig. 3 or the other figures identify the same parts and are only each partially mentioned.

In Fig. 3 it can be seen in particular that the deflection roller 27 approximately above the traction sheave 26 is arranged and how the guide roller 28 in a vertical plane with the Traction sheave 26 is arranged. To guide the cable 3 essentially vertically 1, the traction sheave 26 ends approximately in the direction of the doors 22, 25 flush with the pulley 27. Via this the cable to fixed point 9 on the fixed point carrier 34 passed around, a vertical through the fixed point 9 a tangent to the Deflection roller 27 forms. The fixed point bracket 34 is perpendicular to a car wall in Direction U-bracket 14.

Furthermore, the traction sheave 26 is arranged such that it is used to guide the cable 3 vertically upwards to the other deflection roller 28 also with this one common Has tangential plane. The cable around the pulley 28 is on Attachment point 56 attached to the top of the counterweight 4 as a further fixed point. It also applies that a vertical through the attachment point 56 a Tangent forms relative to the pulley 28.

The guide rails 10, 11 are fastened to U-legs 32, 33 of the U-bracket 14, see also FIG. 7. The guide rails 10, 11 as well as the guide rails 29, 30 are formed from a T-profile with a T-bar and T-beam.

In Fig. 3 brackets 48 are also shown in principle, by two corner stands 15 protrude above a cross strut 16 connecting them. The bracket 48 is used for example for holding glass panes or similar transparent wall elements, which can disguise the elevator installation 1 according to FIG. 1. More mounts on the other corner posts 15 or cross struts 16 are not shown for simplicity.

4 is a section analogous to FIGS. 2 and 3 approximately above the pit module 19 shown.

In the pit module on the base element 17, the drive motor 25 with a Not shown gearbox and buffer 24 for the car. Farther the lower ends of the guide rails 10, 11 and 29, 30 are visible, which by means of Mounting brackets 39, 40 are releasably attached to the base member 17.

The corner stands 15 extend vertically upwards from the floor element 17, wherein between them to form an essentially rectangular elevator frame in cross section corresponding cross struts 16 run.

FIG. 5 shows a section along the line V-V from FIG. 4.

Between the base element 17 and the drive motor 25 is a vibration plate 49 for vibration-damping Storage of the drive motor 25 arranged. The buffer 24 for the Car 2 protrude vertically upwards from the floor element 17, below the car 2, a corresponding stop for the buffer 24 is arranged.

5 only one guide rail 10 is visible, a corresponding one T-bar of this rail arranged perpendicular to the plane of the figure in FIG. 5 is.

FIG. 6 shows a section along the line VI-VI from FIG. 4. Same reference numbers again identify the same parts and are only partially mentioned.

In particular, it can be seen in FIG. 6 that the guide rails for the counterweight, of which the guide rail 30 is shown, also from a T-profile with a T-web 52 and T-bar 54 are formed. The guide rail 30 is at its lower End releasably attached to the base member 17 by means of the mounting bracket 40.

FIG. 7 shows an enlarged illustration of a U-bracket 14. This is made of a U-bridge 57 and U-legs 32, 33 constructed, see also Fig. 2 and 3. On the U-leg 33 a mounting bracket 39 is screwed. This is used for detachable attachment the guide rail 11 on the U-leg 33. The guide rail 11 is by means of her T-beam 45 attached to the bracket 39. From the T-beam 45 is the T-web 13 perpendicular to the opposite guide rail 10. This is constructed analogously from T-bar 44 and T-web 12. Furthermore, the guide rail 10 releasably in an analogous manner by means of fastening bracket 39 on the U-leg 32 attached.

Between the U-legs 32, 33, the fixed point carrier 34 is arranged, which of the Car wall 35, see also FIGS. 2 and 3, protrudes vertically in the direction of U-web 57. At the free end of the fixed point carrier 34 is a fixed point 9 for fastening the Cable 3 arranged. In the illustrated embodiment, the fixed point is through five fastening holes for fastening five individual cables of the cable 3 educated.

Furthermore, the traction sheave 26 is shown in principle, between the U-legs 32, 33 is visible. The middle plane 61 is relative to the mutually facing T-webs 12, 13 arranged offset in the direction of U-web 57.

On an outer side 43 of the U-web 33 is, for example, the controller console 41, see Fig. 1 releasably attached (not shown).

On an outer side 31 of the other U-leg 32 there is an angle bracket 40 detachably fastened with screws. Another bracket 40 is at the free end of the U-leg 32, for example, by welding or the like. The two mounting brackets 40 serve to releasably hold the guide rail 29, 30. These are also made of a T-profile with T-webs 51, 52 and T-beams 53, 54 built up. The two T-bars 51, 52 are directed towards each other and along this the counterweight 4 guided in the vertical direction.

The counterweight 4 is different in the illustrated embodiment Assembled shells on the top of which an assembly insert 37 with fastening or fixed point 56 is detachably fastened by screwing or the like. Below of the mounting insert 37 are in the bowl-shaped counterweight 4 different weight inserts according to the required weight of the Counterweight can be used.

Guide shoes 46 are also arranged on the counterweight 4, only one of which is shown on one side to the counterweight. These guide shoes 46 have one Guide slot 47 in which the T-web 51 or 52 is at least partially inserted. The guide slots 47 can be formed from a wearing part, which if necessary is interchangeable. Appropriate guide shoes with guide slots can can also be used to guide the car along the T-webs 12, 13.

Claims (22)

Elevator system (1) with a car (2), a counterweight (4) connected to it by means of at least one cable (3) and an elevator frame (5) that can be assembled in a modular manner, in which car (2) and counterweight (4) along guides ( 6,7) are movable, the cable (3), at least at its end opposite the counterweight (4), being fastened to a fixed point (9), characterized in that the fixed point (9) is formed on the car (2) and the the guide (6) assigned to the car is arranged on one side of the car in the elevator frame (5). Elevator installation according to claim 1, characterized in that the guide (6) is formed from two guide rails (10, 11) along which the elevator car is guided on one side. Elevator system according to claim 1 or 2, characterized in that the guide rails (10, 11) are formed from a T-profile with mutually facing T-webs (12, 13). Elevator system according to at least one of the preceding claims, characterized in that each guide rail is detachably attached to U-brackets (14) which are spaced apart in the vertical direction in the elevator frame (5) Elevator system according to at least one of the preceding claims, characterized in that an elevator scaffold module (19, 20, 21) has at least substantially vertical corner stands (15) and cross struts (16) connecting them. Elevator system according to at least one of the preceding claims, characterized in that the elevator frame (5) has a lower floor element (17) and / or an upper ceiling element (18), to which the corner stands (15) are detachably fastened. Elevator system according to at least one of the preceding claims, characterized in that the elevator scaffold (5) has at least one pit module (19), one floor module (20) and one ceiling module (21) as elevator scaffold modules. Elevator system according to at least one of the preceding claims, characterized in that the U-bracket (14) is arranged on a cross strut (16). Elevator system according to at least one of the preceding claims, characterized in that the floor module (20) has a floor access door (22). Elevator system according to at least one of the preceding claims, characterized in that buffers (23, 24) for counterweight (4) and / or car (2) and / or a drive motor (25) with traction sheave (26) are arranged on the floor element (17) are. Elevator system according to at least one of the preceding claims, characterized in that at least one deflection roller (27, 28) for the cable pull (3) is rotatably mounted on a cross member (50) and / or on the ceiling module (21). Elevator system according to at least one of the preceding claims, characterized in that the guide (7) for the counterweight (4) has two guide rails (29, 30), in particular on outer sides (31) of U-legs (32) of the U-bracket (14) are releasably attached. Elevator system according to at least one of the preceding claims, characterized in that the fixed point (9) is designed as a fixed point support (34) which is essentially perpendicular to a car wall (35) and to which a car end (8) of the cable pull (3) is detachably fastened is. Elevator system according to at least one of the preceding claims, characterized in that an assembly insert (37) for releasably fastening the counterweight end (38) of the cable pull (3) is arranged on an upper side (36) of the counterweight (4). Elevator system according to at least one of the preceding claims, characterized in that spring elements are arranged on the cable pull ends (8, 38). Elevator system according to at least one of the preceding claims, characterized in that the guide rail (10, 11, 29, 30) on U-brackets (14) and / or on the floor element (17) and / or on the ceiling element (18) by means of fastening angles (39 , 40) are releasably attached. Elevator installation according to at least one of the preceding claims, characterized in that a control console (41) for rotatably mounting a control cable drum (42) on an outer side (43) of a U-leg (33), a U-bracket (14) or a T-bar (44, 45) a guide rail (10, 11) is detachably fastened in the area of the ceiling module (21). Elevator system according to at least one of the preceding claims, characterized in that the car (2) and / or counterweight (4) have guide shoes (46) with guide slots (47), a T-web (12, 13, 51, 52) is at least partially inserted. Elevator system according to at least one of the preceding claims, characterized in that the elevator frame (5) is self-supporting. Elevator system according to at least one of the preceding claims, characterized in that brackets (48) are arranged in the elevator frame (5) for the releasable fastening of, in particular, transparent coverings to cross struts (16) and / or corner posts (15). Elevator system according to at least one of the preceding claims, characterized in that a vibrating plate (49) for mounting the drive motor (25) with a gear is arranged on the floor element (17). Elevator installation according to at least one of the preceding claims, characterized in that each module (19, 20, 21) is preassembled with guide rails (10, 11, 29, 30).

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