EP0433726A1 - Sliding/folding door system for a cabinet - Google Patents

Abstract

The invention relates to a sliding/folding door system for a cabinet, having a first door leaf (1) and a second door leaf (2) which are pivotable relative to one another, and having a carrier arrangement (5) which, in the state of the door leaves (1,2) oriented parallel to one another, can be pushed together with these into a push-in gap (23). To achieve a reliable guidance and movement of the door leaves (1,2) and to make it possible also to use the system for very large dimensions, according to the invention the first door leaf (1) is mounted on a guide rail (8) by means of a guide element (7) so as to be displaceable transversely to the front side of the cabinet, in the swung-open state of the door leaves (1,2) the guide element (7) can be transferred into a second guide rail (9) arranged parallel to the outer wall (6), and attached to the carrier arrangement is a bolt device (10) which prevents unintentional movements and pivotings of the door leaves (1,2) (Figure 1). <IMAGE>

Description

The invention relates to a sliding folding door system for a cabinet, in which a first door leaf is mounted on a second door leaf by means of a first hinge arrangement and in which the second door leaf is attached by means of a second hinge arrangement to a carrier arrangement which is horizontally displaceable an outer wall of the cabinet is stored.

With cabinets there is always the problem that when the cabinet is opened, the doors protrude into the respective room in which the cabinet is installed. This does not play a major role in a normal cabinet, since the doors are only opened for a short time in order to bring objects into or remove them from the cabinet. In cabinets, however, which are to remain in an open state for a longer period of time, the outwardly open doors are undesirable because, on the one hand, they hinder access or insight into the interior of the cabinet and, on the other hand, require a considerable amount of space.

To avoid these disadvantages, systems have been developed, for example for filing cabinets, in which the doors have been replaced by rollable cover devices, as is known from roll cabinets, in which the cover can be moved either upwards or to the side. This embodiment has the disadvantage that a complex guide and displacement mechanism is required to enable the cover to move without jamming. Furthermore, such constructions are limited in size, since an operator is often unable to apply the required operator force, particularly in the case of very high and / or wide cabinets.

Push-in folding door systems are also known from the prior art, in which the door of a cabinet is divided into two door leaves which are connected to one another in an articulated manner. When the door wing hinged to the outer wall of the cabinet is opened, the other door wing can thus be arranged parallel to the first door wing. As a result, the two door leaves protrude into the respective room by a smaller amount when open. In order to completely remove the door leaves from the front area of the cabinet when the cabinet is open, slide-in devices have been developed by means of which the opened, parallel door wings can be pushed into the interior of the cabinet. In order to enable this insertion movement, the outer door leaf is articulated on a carrier arrangement, which in turn can be displaced parallel to the inside of the outer cabinet wall by means of a suitable guide mechanism. For this purpose, rails with ball roller guides are provided, for example. The disadvantage of this embodiment is that there is always the risk that the two door leaves pivot towards each other during the insertion process and thus jam in the interior of the cabinet or prevent further movement into or out of the cabinet. Another disadvantage of this embodiment is that the entire weight of the door leaf must be supported on the support arrangement, so that it must have considerable dimensions in the case of larger door leaves or larger cupboards. Nevertheless, this known construction is only suitable for cabinets of a smaller design, since a secure pivoting and displacement of the door leaf is not possible with larger cabinets.

The invention has for its object to provide a sliding folding door system of the type mentioned, which avoids malfunctions with a simple structure and ease of use and is also suitable for very large cabinets.

The object is achieved in that the first door leaf is guided by means of a guide element on at least one edge area on a first guide rail arranged parallel to the front of the cabinet, that the guide element can be transferred into a second guide rail arranged parallel to the outer wall when the door leaf is open and that on the carrier arrangement a displacement of the carrier arrangement in the not fully opened state of the door leaf and a pivoting of the door leaf in the insertion state preventing locking device is arranged.

The system according to the invention is characterized by a number of considerable advantages. Since two guide rails are provided according to the invention, it is ensured that the door leaves are additionally guided or held in a safe manner both during normal pivoting operation and during the insertion process. This creates the possibility of handling very large and heavy door leaves in a safe manner. The system according to the invention is suitable, for example, for very large cabinets, for example up to widths of 3 m and with door heights of 2.5 m and more.

Another essential advantage of the system according to the invention is given in that a locking device is attached to the carrier arrangement, which controls the respective function of the system in the simplest way and prevents malfunctions. So it is possible by means of the locking device to prevent the insertion process from being initiated before the two door leaves are fully opened, ie are aligned exactly parallel to one another. The locking device also prevents the door leaves from pivoting relative to each other during the insertion process and thus jamming in the cabinet. Additional measures and operating steps are therefore not necessary. Using a very small number of individual elements, the system according to the invention thus offers the highest degree of operating safety and comfort, since it is also inexperienced Operators can operate the system without prior instruction. Damage to the cabinet or the sliding door system can thus be completely avoided.

Another essential advantage of the system according to the invention is given in that the door leaves are guided in an exact, predetermined movement path, since both the first and the second guide rails force the first door leaf to be guided, i.e. ensures the outer edge of the respective door arrangement. It is thereby achieved that the two door leaves can only be pushed into the cabinet when they are aligned parallel to one another, the guide element then being automatically transferred into the second guide rail. In the opposite movement, i.e. when the two door leaves are pulled out of the cabinet, the guide element can only be transferred to the first guide rail when the pull-out process has been completed and the two door leaves can be pivoted without fear of damage to the system.

In a favorable development of the invention it is provided that the locking device comprises a pivotable lever about a horizontal axis, which can be pivoted by placing the first door leaf into a release position and which in its rest position to prevent insertion of the door leaf into the cabinet with a stop of the Cabinets can be brought into engagement. The lever according to the invention thus automatically locks the insertion function before the two door leaves are exactly aligned with one another. At the same time there is an automatic unlocking, ie release of the lever by the approach of the first door wing to the second door wing. Since the lever is mounted on the support arrangement, it is also prevented that the lever can be actuated before the second door leaf is aligned parallel to the outer wall of the cabinet. The one to be effected by the lever The locking function of the insertion process is thus automatically effected when the two door leaves are opened when the cabinet is opened.

It is also advantageous if the lever is biased into a locked position by means of a spring element. The preload ensures, on the one hand, that the lever is not erroneously moved into its release position by other influences, for example vibrations, before the two door leaves are fully opened. Furthermore, the spring pre-tensioning force can be used to spread the two door leaves apart after they have been pulled out of the cabinet, so that the first door leaf is pivoted relative to the second door leaf and the guide element is transferred into the first guide rail.

The guide element is preferably mounted on the free end of the first door leaf, since this ensures the most favorable force relationships and the best guidance of the first door leaf.

Furthermore, it is particularly advantageous according to the invention if the first and the second guide rails are arranged above the door leaves, i.e. the guide element hangs in the two guide rails. This embodiment is favorable on the one hand for optical reasons, since the guide rails are invisible or hardly visible, and secondly it is avoided that objects fall into the guide rails and can impair the function of the system.

In a particularly favorable embodiment of the invention, it is provided that the guide element has a plate-shaped extension which is arranged perpendicular to the plane of the door leaf and which can be inserted into a slot in the lever. In the unlocked state of the lever, the plate-shaped extension is thus located in the lever such that a relative movement between the lever and the extension is at most in the direction of Middle plane of the approach or the groove of the lever is possible, but not a lateral pivoting, which would occur, for example, if the first and the second door leaf were pivoted relative to each other. Thus, the plate-shaped approach serves to keep the two door leaves in their parallel orientation when they are inserted into the cabinet or are in the insertion position or are pulled out of the cabinet. It is advantageous if the slot of the lever is formed on the free end area of the lever, since a particularly favorable torque transmission is made possible and because the size of the plate-shaped extension can be selected independently of the other configuration of the lever.

The support arrangement provided according to the invention preferably comprises a support element which has an L-shaped cross section, a first leg of the support element being aligned parallel to the outer wall, while a second leg is arranged pointing towards the interior of the cabinet. The carrier element is thus designed in the form of an angle element which, on the one hand, enables secure attachment to the displacement mechanism along the outer wall of the cabinet and, on the other hand, creates sufficient space for mounting the lever. The lever can thus be guided and held in a safe manner, with additional, large-sized bearings, for example in the form of a bearing axis or the like. can be dispensed with.

In order to improve the guiding and holding of the lever and to increase its lateral stability, it is provided that the second leg is rounded at its upper edge and engages in an arcuate groove of the lever.

In an advantageous manner, the lifting is still mounted in its central region on the second leg of the carrier element, while the lower end of the lever in the blocking position for locking the carrier element into a recess the outer wall of the cabinet is insertable. Depending on the design of the cabinet, it is therefore not necessary that the lever, which extends in the direction of the interior of the cabinet, supports against a second inner wall of the cabinet covering the doors and the sliding mechanism. Rather, it is sufficient to provide a recess only on the outer wall of the cabinet.

Furthermore, the hinge arrangement for the second door leaf is preferably mounted on the carrier element, since then additional additional bearing elements can be dispensed with.

The spring element for pretensioning the lever is articulated at the lower end of the lever and fastened with its second end to the carrier element. This results in favorable force transmission conditions for the movement of the lever.

According to the invention, the guide element has the task of storing and holding the free end of the first door leaf both during the pivoting process and during the insertion process. For this purpose, it is provided that the guide element for engagement in the first guide rail is provided with four guide wheels, which are each rotatable about a horizontal axis. It is naturally necessary that the guide element itself is pivotally mounted on the first door leaf. Furthermore, the guide element comprises an upper guide wheel, which serves to support the guide element in the second guide rail when it is pushed in. Since only a movement along the second guide rail occurs in the insertion position, tilting or tilting is not to be feared, so that a single guide wheel is sufficient, while the four guide wheels move exactly along the first guide rail in an exact straight line movement without the risk of tilting or ensure tilting.

In order to ensure that the carrier element can be moved in a uniform manner along the guide device on the outer wall of the cabinet, it is provided that a gear wheel is rotatably mounted on the upper and lower region of the carrier element, which gear wheel has a horizontal one arranged on the inside of the outer wall Rack combs. The two gearwheels are preferably fastened on a common axis, so that it is ensured that the upper and the lower region of the carrier element are each displaced by the same path.

In order to remove play from this rack and pinion arrangement and to ensure a uniform movement of the carrier element, it is provided that the rack and the gear wheel are each designed twice, the double regions of both the rack and the gear wheel being in each case part of the division from one another are offset.

Fig. 1

eine schematische Darstellung, in der Draufsicht, auf das erfindungsgemäße System im teilverschwenkten Zustand der Türflügel,

Fig. 2

eine Darstellung entsprechend Fig. 1, im vollständig zurückgeschwenkten, noch nicht eingeschobenen Zustand der Türflügel,

Fig. 3

eine schematische Vorderansicht eines Teils eines mit dem erfindungsgemäßen System ausgerüsteten Schranks,

Fig. 4

eine schematische Draufsicht auf die in Fig. 3 gezeigte Anordnung, wobei die verschwenkte Stellung der Türflügel und die Einschieberichtung erkennbar sind,

Fig. 5

eine schematische Seitenansicht, teils im Schnitt, auf das Trägerelement und das Führungselement in dem in Fig. 2 gezeigten Betriebszustand unter Weglassung der beiden Türflügel,

Fig. 6

eine Draufsicht auf den Endbereich der Außenwand und auf das Trägerelement bei geschlossenem Zustand der Türflügel,

Fig. 7

eine Seitenansicht des erfindungsgemäßen Trägerelementes,

Fig. 8

eine Draufsicht auf das in Fig. 7 gezeigte Trägerelement,

Fig. 9

eine Vorderansicht des erfindungsgemäßen Hebels,

Fig. 10

eine Seitenansicht des Hebels,

Fig. 11

eine rückseitige Ansicht des Hebels,

Fig. 12

eine Schnittansicht des Hebels entlang der Linie XII-XII von Fig. 10,

Fig. 13

eine Schnittansicht entlang der Linie XIII-XIII von Fig. 9,

Fig. 14

eine Draufsicht auf den Hebel,

Fig. 15

eine stirnseitige Ansicht des in den Fig. 7 und 8 dargestellten Trägerelements,

Fig. 16

eine Draufsicht, im Schnitt, auf den Endbereich des zweiten Türflügels, ähnlich der in Fig. 6 gewählten Darstellungsweise,

Fig. 17

eine Schnittansicht eines Ausführungsbeispiels der ersten Führungsschiene,

Fig. 18

eine Schnittansicht eines Ausführungsbeispiels der zweiten Führungsschiene,

Fig. 19

eine Seitenansicht, teils im Schnitt, der ersten Führungsschiene und des ersten Türflügels sowie des Führungselements und

Fig. 20

eine Detailansicht des Trägers des Führungselementes.

The invention is described below using an exemplary embodiment in conjunction with the drawing. It shows:

Fig. 1

1 shows a schematic illustration, in plan view, of the system according to the invention in the partially pivoted state of the door leaves,

Fig. 2

1, in the fully pivoted back, not yet inserted state of the door leaf,

Fig. 3

2 shows a schematic front view of part of a cabinet equipped with the system according to the invention,

Fig. 4

3 shows a schematic top view of the arrangement shown in FIG. 3, the pivoted position of the door leaves and the direction of insertion being recognizable,

Fig. 5

2 shows a schematic side view, partly in section, of the carrier element and the guide element in the operating state shown in FIG. 2, with the two door leaves omitted,

Fig. 6

3 shows a plan view of the end region of the outer wall and of the carrier element when the door leaves are closed,

Fig. 7

a side view of the support element according to the invention,

Fig. 8

7 shows a plan view of the carrier element shown in FIG. 7,

Fig. 9

a front view of the lever according to the invention,

Fig. 10

a side view of the lever,

Fig. 11

a rear view of the lever,

Fig. 12

6 shows a sectional view of the lever along the line XII-XII of FIG. 10,

Fig. 13

3 shows a sectional view along the line XIII-XIII from FIG. 9,

Fig. 14

a top view of the lever,

Fig. 15

7 shows an end view of the carrier element shown in FIGS. 7 and 8,

Fig. 16

3 shows a plan view, in section, of the end region of the second door leaf, similar to the representation chosen in FIG. 6,

Fig. 17

2 shows a sectional view of an exemplary embodiment of the first guide rail,

Fig. 18

2 shows a sectional view of an exemplary embodiment of the second guide rail,

Fig. 19

a side view, partly in section, the first guide rail and the first door leaf and the guide element and

Fig. 20

a detailed view of the carrier of the guide element.

1-4 show schematic representations of the structure and mode of operation of the slide-in folding door system according to the invention. 3 shows a front view of a cabinet according to the invention, FIG. 4 shows a top view of the arrangement according to FIG. 3. The cabinet, symmetrically constructed, comprises a left and a right area. To simplify the illustration, only the operation of the left area is described below. This comprises a first door leaf 1 and a second door leaf 2, which are pivotally connected to one another via a first hinge arrangement 3. The second door leaf 2 is mounted on an outer wall 6 of the cabinet via a second hinge arrangement 4, which is only shown in simplified form in FIGS. 3 and 4. In the closed state of the cabinet, the two door panels 1 and 2 are aligned with one another and close the opening of the cabinet, while the two door panels 1 and 2 can be pivoted toward one another to open the cabinet, as shown in the schematic illustration in FIG. 1 is. After the two door leaves 1 and 2 have been pivoted, they are aligned parallel to one another and can be inserted into an insertion gap 23 of the cabinet, which is formed by the outer wall 6 and an inner wall 24.

The second hinge arrangement 4 is attached to a carrier arrangement 5, which or the like via guide rails, not shown, using ball guide rollers or the like. parallel is displaceable in the horizontal direction to the outer wall 6 in order to introduce the door leaves 1 and 2 into the insertion gap 23. On the inside of the outer wall 6, an upper and a lower rack 25 is also attached, with which a gear meshes, which is mounted on the carrier arrangement 5, in order to ensure that an uneven displacement movement or tilting of the carrier arrangement 5 is avoided.

At the free end of the first door leaf 1, a guide element 7 is attached, which can be moved in a first, horizontal guide rail 8 mounted transversely to the cabinet opening during the pivoting process of the door leaves 1, 2. The guide rail 8 serves to absorb vertical forces and to hold the first door leaf accordingly. The guide rail 8 merges into a second guide rail 9 arranged parallel to the outer wall 6, which is shown schematically in FIGS. 1 and 2. After the two door leaves 1, 2 have been completely pivoted into their parallel position, the guide element 7 is transferred into the second guide rail 9, so that the two door leaves 1, 2 are held and guided in a safe manner even during the insertion process. The second guide rail 9 also serves to absorb vertical forces.

A locking device 10 is further provided on the carrier arrangement 5, which prevents the carrier arrangement 5 from being pushed into the insertion gap 23 before the two door leaves 1, 2 are arranged in the insertion position shown in FIG. Furthermore, the locking device 10 has the effect that the two door leaves 1, 2 are held in the mutually parallel position as long as an insertion or extraction movement takes place along the outer wall 6.

5 shows a side view of a detail of the cabinet according to the invention, the view being directed into the insertion gap 23. The two door panels 1, 2 are shown in the The operating state has already been aligned parallel to one another, similar to the illustration chosen in FIG. 2, but has been omitted to clarify the illustration. 5 that the guide element 7 has a plate-shaped carrier, on the upper area of which four guide wheels 21 are mounted, which are arranged in pairs on both sides of the carrier and can each rotate about a horizontal axis. Furthermore, an upper guide wheel 22 is arranged on the upper area of the guide element 7, which serves to guide or hold the guide element 7 in the second guide rail 9. The two FIGS. 17 and 18 each show cross-sectional representations of embodiments of the guide rails 8, 9 or of the elements formed by them, which can be plugged onto corresponding wall elements of the cabinet. The first guide rail 8 is, as can be seen from FIG. 17, essentially U-shaped and comprises two inwardly directed legs 26 which form the running surfaces for the guide wheels 21, as can be seen from FIG. 19. In the upper area, the first guide rail 8 is provided with a recess 27, in which the upper guide wheel 22 can be moved along the first guide rail 8 without a supporting function during the displacement. 18 shows a profile shape of the second guide rail 9, in which a recess 28 can be seen in particular, which is dimensioned such that the upper guide wheel 22 can run in this recess 28.

19 and 20, the guide element 7 is shown in detail, wherein in particular the configuration of the plate-shaped carrier can be seen from FIG. 20. The carrier, which is provided with a projection 15, is attached via a rotary fitting 29, which is pivotably mounted on the first door leaf 1 and on the carrier of the guide element 7. Using a screw 30 and a suitable threaded rod, the height of the guide element 7 can be adjusted in order to adapt it exactly to the first guide rail 8.

5 further shows a carrier element 16 according to the invention, which is shown in FIGS. 7 and 8 in a side view and in a top view. The carrier element 16 is designed in the form of an angle element and comprises a first and a second leg 17, 18, the first leg 17 being aligned parallel to the outer wall 6 of the cabinet, while the second leg 18 is perpendicular to the outer wall 6 in the interior of the cabinet or the insertion gap 23 protrudes.

The carrier element 16 is provided with a horizontal axis 11, about which a lever 12, which is omitted in FIG. 5, is pivotably mounted, which will be described in detail in FIGS. 11-14. The upper end of the carrier element 16 is provided with an upper, rounded, arcuate edge 19, the bending radius of which has its center in the horizontal axis 11. Furthermore, a guide slot 31 is formed in the central area, which also serves to mount the lever 12, since a guide pin of the lever 12 can be moved in this guide slot 31. The guide slot 31 is arcuate, the center of curvature also being formed by the horizontal axis 11 here.

Furthermore, a spring element 13 is shown schematically in FIG. 5, which serves to pivot the lever 12 into a locking position in which it prevents the door leaves 1, 2 from being pushed into the insertion gap 23.

In the illustration according to FIG. 5, the rack 25 and the insertion and guide mechanism, with the aid of which the carrier element 16 can be displaced to the outer wall 6, have been omitted. This mechanism corresponds to the state of the art. 7 and 8 each show support feet 32, or the like on roller guide cages. can be attached to move the support member 16 relative to the outer wall 6. The slots 33, 34, which are formed on the second leg 18 of the carrier element 16, serve to accommodate the second hinge arrangement 4 for mounting the second door leaf 2 on the carrier element 16.

FIG. 6 shows a top view of the carrier element 16, the configuration of the second hinge arrangement 4 for mounting the second door leaf 2 being recognizable in particular. A ball roller guide mechanism 35 is also schematically shown in FIG. 6, which is fastened to the outer wall 6 for displacing the carrier element 16.

9-14 each show views of the lever according to the invention, which is mounted on the carrier element 16. The side view shown in FIG. 10 corresponds to the assignment to the illustration according to FIG. 5, it being evident that the lever 12 is pivotably mounted on the carrier element 16 by means of the horizontal axis 11. At the lower end, the lever 12 has a bolt 36 which is guided in the guide slot 31 of the carrier element 16. The bolt 36 together with the guide slot 31 limits the pivoting of the lever 12. The lever 12 is furthermore, as can be seen from the figures, cranked and provided with an arcuate groove 20 whose center of curvature, as can be seen from FIG. 10 , is formed by the axis 11. The groove 20 is arranged and dimensioned such that the upper, arcuate edge 19 of the second leg 18 of the carrier element 16 can be inserted in order to guide and hold the lever 12 in a suitable manner.

At the upper area of the lever 12, an attachment provided with a slot 14 is provided. The slot 14 is dimensioned and dimensioned such that the extension 15 of the guide element 7 can be inserted into it when the first and second door leaves are in the position parallel to one another. By pressing the first door leaf 1 against the second door leaf 2, the shoulder 15 is thus inserted into the slot 14 and at the same time the lever is pivoted into an unlocked position, in which the latter is essentially aligned with the second leg 18 and thus enables insertion into the insertion gap 23. As soon as the first door leaf 1 is pivoted away from the lever 12, the lever 12 is pivoted by the spring element 13, which engages a bolt 37 at the lower end of the lever 12. The lever thus projects laterally beyond the insertion gap 23 and would abut against the inner wall 24 during an insertion operation or engage with its lower end in a recess of the outer wall 6, not shown in the figures, so that a displacement movement of the carrier element 16 is prevented. It follows at the same time that it is not possible to pivot the door panels 1, 2 when the door is inserted, since the extension 15 of the guide element 7, which is located in the slot 14 of the lever 12, because of the tight fit and the when the door leaves 1, 2 tilt relative to one another, such a pivoting is prevented.

16 shows in detail in section view the rotary fitting 29 already described in connection with FIG. 19, with the aid of which the guide element 7 is pivotably mounted on the first door leaf 1.

The invention is not limited to the exemplary embodiments shown, but there are many possible modifications and modifications within the scope of the invention.

Claims (19)

Sliding-folding door system for a cabinet, in which a first door leaf (1) is mounted on a second door leaf (2) by means of a first hinge arrangement (3) and in which the second door leaf (2) is mounted on by means of a second hinge arrangement (4) A support arrangement (5) is attached, which is horizontally displaceably mounted on an outer wall (6) of the cabinet, characterized in that the first door leaf (1) by means of a guide element (7) on at least one edge area on a first, parallel to the front of the Cabinet-arranged guide rail (8) is guided so that the guide element (7) in the opened state of the door leaves (1, 2) can be transferred into a second guide rail (9) arranged parallel to the outer wall (6), and that on the carrier arrangement (5) a displacement of the carrier arrangement (5) when the door leaves (1, 2) are not fully opened and pivoting of the door leaves (1, 2) in the insertion stood preventing locking device (10) is arranged. System according to Claim 1, characterized in that the locking device (10) comprises a lever (12) which can be pivoted about a horizontal axis (11) and which can be pivoted into a release position by placing the first door leaf (1) and which in its rest position to prevent it inserting the door leaves (1, 2) into the cabinet can be brought into engagement with a stop of the cabinet. System according to claim 2, characterized in that the lever (12) is biased into its locked position by means of a spring element (13). System according to claim 1 or 2, characterized in that the guide element (7) is mounted at the free end of the first door leaf (1). System according to one of Claims 1-4, characterized in that the first (8) and the second (9) guide rails are arranged above the door leaves (1, 2). System according to one of claims 1-5, characterized in that the guide element (7) has a plate-shaped extension (15) which is arranged perpendicular to the plane of the door leaf and which can be inserted into a slot (14) in the lever (12). System according to claim 6, characterized in that the slot (14) of the lever (12) is formed at the free end region of the lever (12). System according to one of claims 1-7, characterized in that the carrier arrangement (5) comprises a carrier element (16) which has an L-shaped cross section and that a first leg (17) of the carrier element (16) parallel to the outer wall (6 ) and a second leg (18) are arranged facing the interior of the cabinet. System according to claim 8, characterized in that the lever (12) is mounted on the second leg (18). System according to claim 9, characterized in that the second leg (18) is rounded at an upper edge (19) and engages in an arcuate groove (20) of the lever (12). System according to one of claims 8-10, characterized in that the lever (12) is mounted on the second leg (18) in its central region. System according to claim 11, characterized in that the lower end of the lever (12) can be inserted into a recess in the outer wall (6) in the blocking position for locking the carrier element (16). System according to claim 12, characterized in that the hinge arrangement (4) for the second door leaf (2) is mounted on the carrier element (16). System according to one of claims 12 or 13, characterized in that the spring element (13) is articulated at the lower end region of the lever (12). System according to one of claims 1-14, characterized in that the guide element (7) for engaging in the first guide rail (8) comprises four guide wheels (21) which can each be rotated about a horizontal axis, and an upper guide wheel (22) , which can be inserted into the second guide rail (9). System according to one of claims 1-15, characterized in that the guide element (7) is pivotally mounted on the first door leaf (1). System according to one of claims 1-16, characterized in that a gear is rotatably mounted on the upper and lower area of the carrier element (16), which meshes with a horizontal rack arranged on the inside of the outer wall (6). System according to claim 17, characterized in that the gear wheels are fixed on a common axis. System according to one of Claims 17 or 18, characterized in that the toothed rack and the toothed wheel are each designed twice to eliminate play and are offset from one another by part of the division.

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