EP2281966B1 - Sliding sunroof with multiple window leaves - Google Patents

Description

The invention relates to a roof sliding window with a plurality of window sashes which are displaceable side by side in the window opening in a open position releasing a window opening from one of the window sash stacking Nachrückvorrichtung. Such roof sliding windows are usually used as roof windows or, for example, as an emergency exit or smoke heat vent or are designed in such a way and allow for a relatively small space requirement closing or releasing a large window opening. Such roof sliding windows according to the prior art, for example, in DE19711469A1 . WO91 / 19070A1 and DE9016628U1 disclosed. The special feature is that the individual window sashes are stacked when opening or releasing the window opening in the Nachrückvorrichtung one above the other. As a result, the space required for stowing the window sash next to the window opening substantially corresponds to the width of one of the window sash. When moving the uppermost window sash in the window opening, the Nachrückvorrichtung that the underlying window sash nachges and thus can also be moved into the window opening or is moved. The roof sliding window according to the invention provides that the Nachrückvorrichtung in this case has at least one biased spring element for automatic moving back of the superimposed window sash and that the window sash coupling means by which a window sash is releasably coupled during its displacement with a nachückenden window sash, wherein the Nachrückvorrichtung such controllable means for adjusting the spring tension of the spring element having a coupling does not occur. When pushing out the window sash from the Nachrückvorrichtung so the retraction of the window sash is ensured by the force stored in the prestressed spring element. If the window sash is moved out of the window opening into the follower device, the weight of the respective window sash ensures that a window sash already lying in the follower device is displaced in such a way and the spring element is further tensioned, that the window sash pushed into the follower device over the already in it Window sash is pushed. As a result, the stacking of the casement is made possible in a simple manner one above the other in the Nachrückvorrichtung. If the uppermost window sash moved into the window opening, the underlying sash takes the position of the pushed-out sash, so he moves to the position for pushing out. Furthermore, it is provided that the window sashes have connectable coupling means. The coupling means are designed such that when a window sash is moved into the window opening, this is coupled to the underlying and nachrückenden by the Nachrückvorrichtung window sash. This ensures that only one of the sash must be moved, and this automatically pulls the other, following sash after him. The same applies when opening or releasing the window opening, in which it is sufficient to move one of the window sash in the Nachrückvorrichtung. Due to the coupling, the window sashes remaining in the window opening follow automatically. When moving the sash in the Nachrückvorrichtung the sash are decoupled from each other, so that a particularly simple and compact stacking of the sash in the Nachrückvorrichtung is enabled. The above-mentioned device of the Nachrückvorrichtung serves to adjust the spring tension of the spring element. The device is controllable in such a way that a coupling-up does not occur. This means that the spring tension of the spring element by means of the device is reduced such that when moving a sash from the Nachrückvorrichtung or the underlying casement or the remaining in the Nachrückvorrichtung / remaining sash does not move, since his or her weight the remaining Spring tension of the spring element exceeds. This prevents a window sash from coming in, and thus the sashes from being interlinked with each other.

The roof sliding window according to the invention has the advantage that the window sash can be moved independently of each other in the window opening. This facilitates in particular the cleaning of the roof sliding window. Namely, it is now possible for a user, for example, to move a single window sash out of the follower device into the window opening, so that it can clean the window sash in question, in particular from the outside, through the remaining released window opening. In a roof sliding window with, for example, three window sashes, the user can thus, for example, first move the first window sash into the window opening, clean it from the outside, and then only the second sash in order to clean it from the outside. The outside of the third, remaining in the Nachrückvorrichtung window sash can then be cleaned in the Nachrückvorrichtung. Conveniently, the Nachrückvorrichtung on a corresponding access opening. If necessary, this can be done Also special cleaning tool can be provided. Advantageously, the user can either individually during assembly or even later determine which of the casements to be verkuppelt each other, and in which casement a coupling nachzuschiben should be omitted.

According to an advantageous development it is provided that the Nachrückvorrichtung has a height-movable and operatively connected to the spring element frame on which the sash can be stacked. The Nachrückvorgang the window sash is thus effected by the movable in height frame, which is operatively connected to the prestressed spring element. At least the lowermost window sash and the frame advantageously have corresponding guide means for guiding the window sash on the frame.

Advantageously, the spring element between the frame and a displaceable for adjusting the spring tension holding means of the device is biased. This means that the device can act directly on the spring element, in particular on the spring travel of the spring element and thus on the spring tension.

Preferably, the holding means is displaceable by an electric motor. As a result, a simple control or adjustment of the spring tension is possible. Particularly preferably, the device is remotely controllable, so that the spring tension of the spring element is adjustable from any location, whereby the operation and maintenance or cleaning is simplified.

It is advantageously provided that the device for displacing the holding means has an electromotive rack drive. In this case, either the electromotive drive unit of the rack drive can be arranged stationary and the rack on which the holding means is arranged to be movable. Or the holding means is arranged on the drive unit, which is movable on the stationary rack. Conveniently, the rack is aligned in the longitudinal extent of the spring element, so that the spring travel or the spring tension is easy and precise adjustable.

Advantageously, the spring element is designed as a tension spring, so that a tensile force is always transmitted from the device, or the holding means, via the spring element to the frame. Particularly preferably, the spring element is designed as a spiral spring. This allows a cost-effective production of the roof sliding window and easy installation. Regardless of the design of the spring element should be noted here that the device described above, of course, is not only suitable to prevent a coupling nachrücken if necessary, but that it is also suitable over the life of the spring element away occurring fatigue of both the spring element as well as other components relating to the process of the frame of the follower. If the device is designed to be remotely controllable, as described above, this allows easy maintenance and readjustment of the roof sliding window, without having to dismantle or partially dismantle the roof sliding window.

According to a development of the invention, a cable, Zahnriemen- and / or chain hoist between the frame and the spring element is interposed. This allows both the spring element as Also, the device for adjusting the spring tension space-optimized in or on the Nachrückvorrichtung or the roof sliding window are arranged. In particular, this makes it possible to arrange the device and the spring element in the Nachrückvorrichtung below the frame and thus optionally stacked on the frame window sash. This results in a particularly compact arrangement, yet allows an efficient power transmission for the Nachrücken.

According to an advantageous embodiment of the roof sliding window is provided that the movable in height frame is tiltable. Preferably, the tilting axis is aligned perpendicular to the direction of displacement of the window sash and advantageously arranged centrally with respect to the frame and / or the window sash. The tilting of the frame makes it possible, in particular, for the window sashes to be able to tilt with respect to the displacement plane in the window opening in the follower device, so that the window sash that is moved out of or into the follower device is tilted the underlying inclined / tilted sash off or runs up. This results in a gentle upward or stacking, in which the method of the frame in its height over the entire width of the window - in the direction of movement - takes place. Advantageously, the Nachrückvorrichtung has at least one, the frame overlapping carriage, which is conveniently movable on a stationary frame in height.

Furthermore, it is provided that the window sash as a coupling agent in each case have at least one driving element. Under a Driving element here is an element to understand that is designed and arranged on a window sash and / or aligned that it engages a corresponding entrainment of an adjacent - above or below - window sash when moving a window sash form-fitting and thereby entrains the adjacent sash.

Advantageously, the overhead window sash as entrainment each have a catch rail, in which engages a driving element of an underlying sash when coupling rearward. When moving the sash from the Nachrückvorrichtung in the window opening, ie in the frame of Dachschiebefensters, the catching track captures the entrainment of the underlying sash - as long as this moves behind -, whereby the two sash are coupled together. By appropriate actuation of the device described above for adjusting the spring tension, the coupling-up movement is prevented, so that the catch rail is moved past the driving element of the underlying window sash.

It is further provided that the entrainment element of the underlying window sash is designed as a particular rotatably mounted catch roller. Due to the rotatable mounting frictional forces between the window sashes when moving minimized and the sliding of the sash altogether. Conveniently, the catch rail is aligned obliquely, in particular here the rotatable mounting of the roller leads to a reduction in friction force. The inclination also causes the moving of a window sash raised in the Nachrückvorrichtung underlying sash or pushed down - depending on the direction of the shift - thereby supporting the procedure of the framework.

Advantageously, the catch rail seen in cross-section on a U-profile, wherein the roller engages in the catch rail such that it cooperates with two legs of the U-profile, depending on the direction of movement of the sash. As a result, not only the entrainment of the underlying casement is guaranteed, but also initiated the stacking process in the Nachrückvorrichtung. If two mutually coupled window sash retracted into the Nachrückvorrichtung, so the front lying in the direction of movement window sash is moved to an advantageously arranged stop in the Nachrückvorrichtung or on the frame of the Nachrückvorrichtung. Once the window sash meets the stop, the obliquely oriented, the U-profile having catching rail causes the window sash lying on the frame of the Nachrückvorrichtung is first pressed down in the region of the roller, so preferably on its side facing the window opening, whereby - if the frame is tilted as described above - first the frame is tilted together with the window sash lying on it so far that the following window sash pushed over the now tilted under it sash and then the entire underlying sash or the frame is moved in height.

According to a development of the invention, each rack is associated with a toothed rack which can be brought into operative connection with an electromotive drive for displacing the casements in the window opening. Conveniently, the electromotive Drive designed as a reduction drive and arranged at the window opening associated side of the Nachrückvorrichtung. By the coupling means described above, it is thus possible in a simple manner, by means of the single electromotive drive to move all the casement from the Nachrückvorrichtung in the window opening next to each other.

Finally, it is provided that the roof sliding window has at least one sensor for detecting the position of at least partially pushed out of the Nachrückvorrichtung window sash. The sensor is operatively connected to the means for adjusting the spring tension, so that the time at which the spring tension for preventing a coupling Nachrückens should be reduced, is controlled in a simple manner by the sensor / detected.

Figur 1

eine vorteilhafte Nachrückvorrichtung eines Dachschiebefensters in einer perspektivischen Darstellung,

Figur 2

die Nachrückvorrichtung in einer schematischen Seitenansicht,

Figur 3

die Nachrückvorrichtung in einer schematischen Schnittdarstellung,

Figur 4

vorteilhafte Kupplungsmittel von Fensterflügeln des Dachschiebefensters in einer perspektivischen Draufsicht,

Figur 5

die Kupplungsmittel in einer perspektivischen Unteransicht und

Figur 6

Beschläge von drei miteinander lösbar gekuppelten Fensterflügeln des Dachschiebefensters in einer perspektivischen Darstellung.

In the following, the invention will be explained in more detail with reference to an embodiment. Show this

FIG. 1

an advantageous Nachrückvorrichtung a Dachschiebefensters in a perspective view,

FIG. 2

the Nachrückvorrichtung in a schematic side view,

FIG. 3

the Nachrückvorrichtung in a schematic sectional view,

FIG. 4

advantageous coupling means of window sashes of the roof sliding window in a perspective plan view,

FIG. 5

the coupling means in a perspective bottom view and

FIG. 6

Fittings of three detachably coupled window sashes of the roof sliding window in a perspective view.

The FIG. 1 shows a perspective view of an embodiment of an advantageous roof sliding window 1, which is particularly suitable for installation in residential roofs. Of the roof sliding window 1 in this case essentially a Nachrückvorrichtung 2 is shown. In the Nachrückvorrichtung 2 window sash - not shown here - the roof sliding window 1 stacked one above the other and from there side by side slidable in a window opening. For this purpose, the Nachrückvorrichtung 2 a movable in height frame 3, on which the sash can be stacked.

How best of the FIG. 2 can be seen, which is a schematic side view of the Nachrückvorrichtung 2 - seen from the window opening -, depends the frame 3 of the Nachrückvorrichtung 2 on both sides of a respective chain hoist 4 and 5. The respective chain hoist 4, 5 is on a frame supporting, on a stationary frame 6 of the Nachrückvorrichtung 2 guided slide 7 and 8 attached. The respective chain hoist 4, 5 leads from the corresponding carriage 7, 8 via a chain wheel 9 or 10 arranged above the frame 3, where the chain hoist is deflected by 180 ° and leads to a further chain wheel 11 or 12 below the frame 3. There, the respective chain hoist 4, 5 is substantially at 90 ° is redirected to a below the frame 3 and in the bottom region of the Nachrückvorrichtung 2 arranged device 13.

The device 13 has according to FIG. 2 an electric motor rack drive 14, which is operatively connected to the chain hoist 4, and an electric motor rack drive 15, which is operatively connected to the chain hoist 5. The rack drives 14 and 15 each have a stationary rack 16 and 17, respectively, on each of which a drive unit 18 or 19 can be moved by an electric motor. On the drive units 18, 19, a holding means 20, 21 is arranged in each case, which may be formed in particular integrally with a housing part of the respective drive unit 18 or 19. The holding means 20, 21 are each connected to one end of a spring element 22, 23, whose respective other end is connected to the chain hoist 4 or 5. The spring elements 22, 23 are thus interposed between the device 13 and the frame 3. According to the embodiment of the FIG. 1 are the spring elements 22, 23 each formed as a spiral spring 24 and loaded on train. As is also evident from FIG. 1, the chain hoists 4, 5 each have two chains running parallel to one another, which are tensioned between an intermediate piece 25 connected to the corresponding end of the respective spring element 22, 23 and the corresponding slide 7, 8.

From the FIG. 1 is also apparent that the rack drives 14 and 15 of the device 13 not with each other, as in the FIG. 2 for reasons of clarity shown schematically, but are preferably arranged side by side at the same height. About that out shows FIG. 1 an alternative embodiment of the device 13, in contrast to the above-described embodiment according to FIG. 2 Advantageously, the drive units 18, 19 are arranged stationary, while the racks 16, 17 corresponding to the holding means 20, 21 and by means of the drive units 18, 19 for adjusting the spring tension can be moved.

• Bei vollständig freigegebener Fensteröffnung des Dachschiebefensters 1 liegen sämtliche Fensterflügel des Dachschiebefensters übereinander gestapelt in der Nachrückvorrichtung 2 beziehungsweise auf dem Rahmen 3. Der Rahmen 3 befindet sich dabei auf einer derartigen Höhe, dass der zuoberst liegende Fensterflügel nach rechts beziehungsweise in Richtung eines Pfeils 26 aus der Nachrückvorrichtung 2 herausgeschoben werden kann. Dazu liegt die Unterseite des zuoberst liegenden Fensterflügels im Wesentlichen auf Höhe einer Blendrahmenführung 28 des die Fensteröffnung bildenden Blendrahmens. Durch Verschieben des Fensterflügels von dem Rahmen 3 verringert sich das auf den Rahmen 3 wirkende Gesamtgewicht der verbleibenden Fensterflügel, sodass die auf Zug beanspruchten Federelemente den Rahmen 3 mittels der Kettenzüge 4, 5 und der Schlitten 7, 8 nach oben - wie durch einen Pfeil 27 gekennzeichnet - verfahren. Dadurch rückt der unter dem zuerst verschobenen Fensterflügel liegende Fensterflügel nach. Insbesondere rückt er in die Ausschiebeposition nach, aus der der Fensterflügel dann in die Fensteröffnung verschoben werden kann.

In the following, the operation of the advantageous roof sliding window will be explained in more detail:

• When fully released window opening of the roof sliding window 1 are all the sash of Dachschiebefensters stacked in the Nachrückvorrichtung 2 or on the frame 3. The frame 3 is located at such a height that the uppermost lying window sash to the right or in the direction of an arrow 26 from the Nachrückvorrichtung 2 can be pushed out. For this purpose, the underside of the uppermost window sash lies substantially at the height of a window frame guide 28 of the window opening forming the frame. By moving the sash of the frame 3, the force acting on the frame 3 total weight of the remaining window sash decreases, so that the claimed on train spring elements the frame 3 by means of chain hoists 4, 5 and the carriage 7, 8 upwards - as indicated by an arrow 27 characterized - method. As a result, the window sash below the first window sash moves. In particular, it moves to the Ausschiebeposition from which the window sash can then be moved into the window opening.

The window sash advantageously have coupling means 31, as they are exemplified in the FIGS. 4 to 6 are shown. On the embodiment and operation of the coupling agent will be discussed in more detail later.

When Nachrückvorgang in which due to the prestressed spring elements 22 and 23 of the underlying sash is pressed against the (still) overlying sash, the sash are coupled together by means of the coupling means 31, so that the movement of a sash is transmitted to the other. As a result, all of the window sashes from the follower device can be successively moved side by side into the window opening, wherein only the sliding of one of the window sashes is necessary for this purpose. When releasing the window opening, the principle described above works the other way round. The window sash in the Nachrückvorrichtung, as indicated by an arrow 30, inserted, each window sash can be pushed only up to a certain stop on the frame 3. Due to its weight and / or due to a certain shape of the coupling means 31, the frame 3 is moved downwards, as indicated by an arrow 29, so that the following window sash can be pushed over the window sash 3 lying on the frame. This is repeated until all of the sashes in the follower 2 are stacked one above the other.

A particular advantage of the roof sliding window is that when moving a sash in the window opening, the device 13 is controlled so that a coupling rearward movement of the remaining window sash is omitted, and from the Nachrückvorrichtung 2 pushed out window sash is moved alone in the window opening without him pulling another window sash after. By moving the drive units 18 and 19 on the racks 16 or 17, or alternatively by moving the racks 16, 17 by means of the drive units 18 and 19, the spring tension of the spring elements 22, 23 can be influenced or adjusted in a simple manner. This makes it possible, when moving a sash out of the Nachrückvorrichtung 2 in the window opening to prevent a coupling nachrücken. Namely, the spring tension is reduced while a window sash is moved into the window opening, the spring tension is not sufficient to move the frame 3 with the remaining / remaining window sashes in the direction of arrow 27 upwards. Rather, the window sash remain substantially in the previous position without moving. The coupling means 31 can thus not be brought into operation with each other, so that the casement alone or detached from the underlying casement is moved into the window opening or can be.

This allows the user in particular a simple and straightforward cleaning of the outside of the window sash. By means of the device 13, it is possible for him to move one or more casements detached from one or more other of the casements in the window opening, so that always a portion of the window opening remains released. Through this opening area, the user can reach through to clean the outside of the window sash. The roof sliding window described thus makes it possible in a simple manner, without the coupling means must be operated directly, a joint-domes of the sash to prevent when moving. Due to the advantageous embodiment of the device 13, it is possible verkuppelt the window sash in any manner or decoupled from the Nachrückvorrichtung move into the window opening.

Since in such roof sliding windows the weight of the individual window sash can be comparatively high, it is advantageous to provide an electric motor drive 32 for moving the window sash. Preferably, the drive 32 is a gear, toothed belt or chain drive, which can be brought into operative connection with the window wings associated racks. Conveniently, the drive is in the area close to the window opening, spaced from the frame 3, as in FIG FIG. 3 represented, arranged. This allows the user to move the window sashes individually or continuously in the window opening. For emergency, a clutch is advantageously provided by means of which the drive 32 can be decoupled from the window sashes, so that even in a power failure, for example, the window sash can be moved without the frictional torque of the drive must be overcome.

As best of the sectional view of the FIG. 3 can be seen, which is a plan view of the carriage 8, the frame 3 is tiltable about a suitably aligned perpendicular to the direction of movement of the sash axis. The FIG. 3 shows on the one hand the frame 3 in a horizontal position in which the frame is parallel or in a plane with the window frame guide 28, so that the lying on the frame 3 sash moved easily and horizontally in or on the frame guide 28 into the window opening can be (for example by means of the electric motor drive 32). Furthermore, in the FIG. 3 a tilted position of the frame 3 shown in phantom. Differently high shock absorbers 33 and 34 on the carriage 8 limit the tilting of the frame 3 in such a way that it can only be displaced downward from a first position lying in one plane with the frame guide 28 into a second position tilted downwards with the frame guide 28 / can be tilted. The shock absorber 33 is correspondingly higher than the shock absorber 34 is formed. Particularly advantageously, the shock absorbers 33 and 34 are formed at least partially elastically deformable, so that shocks are damped when tilting the frame 3. Furthermore, 7 corresponding shock absorbers are advantageously arranged on the carriage.

The tilting of the frame 3 allows when moving a sash in or out of the Nachrückvorrichtung 2 that the carriage 7, 8 or the frame 3 over the entire travel, so over the entire width of the sash, in height in the direction of arrows 27 or 29, depending on the direction of movement, is moved. Are all the sashes side by side in the window opening, the frame 3 is advantageously in tilted position (shown in phantom), with its pointing to the frame guide 28 end at the level of the frame guide 28, so that when the first sash is inserted into the Nachrückvorrichtung, the frame 3 "slowly" down - in the direction of arrow 29 - is moved. Alternatively, the frame 3 can also lie horizontally in the extension of the window frame guide 28 (solid line) when all the window sashes are in the window opening.

The FIGS. 4 to 6 show an embodiment of the above-mentioned coupling means 31 of the window sash of the roof sliding window 1 in different perspective views. The FIG. 6 shows for this purpose fittings 35, 36 and 37 of three window wings of the roof sliding window 1. The fittings 35, 36 and 37 each have a with the electric motor drive 32 operatively engageable rack 38, 39 and 40 for moving the window sash. According to FIG. 6 the fittings 35 to 37 and thus the corresponding associated window sash by means of the coupling means 31 are releasably coupled together. With reference to the fittings 36 and 37 will now be with reference to the FIGS. 4 and 5 the coupling means 31 will be explained in more detail.

As a coupling means 31, the fitting 37 has a roller 42 rotatably mounted on a flange 42, whose axis of rotation is aligned perpendicular to the direction of movement of the sash or the fittings 35 to 37. The roller 42 in this case forms a driving element 43 of the fitting 37. The fitting 36 has at its fitting 37 associated end as entrainment a catch rail 44, which seen in cross section has a U-profile and obliquely, approximately at an angle of 45 ° the fitting 36 is aligned. The two legs of the catching rail 44 engage around the roller 42. If the window sashes are in the window opening, the movement of one of the window sashes or fittings 36, 37 on the other fitting 37, 36 is transmitted via the catching rail 44 and the roller 42. Appropriately, the window sash are guided in the window opening, that they are displaceable only in the displacement direction, ie in a plane.

On the underside of the fitting 36 of the fitting 37 closer leg of the catch rail 44 ends so below the more distant leg that when moving the fitting 36 in the Nachrückvorrichtung 2, the roller 42 below the fitting 36 from the catch and exit on the underside of the fitting 36 can roll, and that when moving the fitting 36 from the Nachrückvorrichtung 2, the roller 42 is taken through the longer leg of the catch rail 44. If the window sash moved into the Nachrückvorrichtung 2 and the fitting 37 or the corresponding window sash completely on the frame 3, so causes the inclined catch rail 44 together with the roller 42, that the roller 42 having the end of the fitting 37 is pressed down. If the frame 3 is tiltably mounted as described above, the lying on the frame 3 sash is tilted accordingly, so that the fitting 36 having window sash over the fitting 37 having window sash can be pushed into the Nachrückvorrichtung. Accordingly, it behaves between the fittings 36 and 35. As a result, the casements are stacked one above the other in the Nachrückvorrichtung 2 in a simple manner.

If, by means of the device 13, the spring tension of the spring element 22 and 23 is changed so that a coupling does not occur, the catch rail 44 is pushed over the roller 42 when moving a window sash out of the follower 2, so that the driving element 43 of the window sash below (roller 42) not taken.

To guide the window sash, the fittings at their ends in each case two mutually perpendicular roller body 45 and 46, which einliegen in corresponding guides of the window frame guide 28 and thereby support the window sash and lead.

At least the fitting 36 advantageously has at its catch rail 44 end having a cam contour 47, which is arranged at the bottom spaced from the catch rail 44 such that the roller 42 runs on the cam contour. The cam contour 47 causes either the fitting 36 or the fitting 37 and thus the corresponding window sash is tilted so that a bent sheet metal edge of a window sash, which is located on the opposite side of the sash and should prevent the ingress of water between the sashes over the Rolled body 46 is lifted away.

Overall, the advantageous roof sliding window thus provides a simple and inexpensive way to move the sash independently of each other in the window opening, and thus to enable a user in particular to clean the outside of the sash.

Claims (17)

1. A roof sliding window (1) having a plurality of window sashes which, in an open position in which a window opening is uncovered, are slidable from a succession device (2) into the window opening in a side-by-side manner, with the succession device (2) stacking the window sashes one on top of the other, wherein the succession device (2) has at least one biased spring element (22, 23) for an automatic succession of the superposed window sashes, and wherein the window sashes have coupling means (31) which couple a window sash, while it is being slid, to a succession window sash in a detachable manner, characterised in that the succession device (2) has an assembly (13) for adjusting the spring tension of the spring element (22, 23), the assembly (13) being controllable such that a coupling succession is omitted.
2. The roof sliding window according to claim 1, characterised in that the succession device (2) has a frame (3) which is movable in height and is operably connected to the spring element (22, 23) and on which the window sashes can be stacked.
3. The roof sliding window according to claim 2, characterised in that the spring element (22, 23) is biased between the frame (3) and a holding means (20, 21) of the assembly (13), which holding means (20, 21) can be displaced to adjust the spring tension.
4. The roof sliding window according to claim 3, characterised in that the holding means (20, 21) is displaceable in an electromotive manner.
5. The roof sliding window according to any one of claims 3 or 4, characterised in that the assembly (13) has an electromotive rack and pinion drive (14, 15) to displace the holding means (20, 21).
6. The roof sliding window according to any one of the preceding claims, characterised in that the spring element (22, 23) is formed as an extension spring.
7. The roof sliding window according to any one of the preceding claims, characterised in that the spring element (22, 23) is formed as a spiral spring (24).
8. The roof sliding window according to any one of claims 2 or 3, characterised in that a cable pull, a toothed belt pull and/or a chain pull (4, 5) is interposed between the frame (3) and the window element (22, 23).
9. The roof sliding window according to any one of claims 2, 3 or 8, characterised in that the frame (3) is mounted in a tiltable manner.
10. The roof sliding window according to any one of claims 2, 3, 8 or 9, characterised in that the succession device (2) has at least one slide (7, 8) bearing the frame (3).
11. The roof sliding window according to any one of the preceding claims, characterised in that the window sashes each have at least one entrainment element (43) as coupling means (31).
12. The roof sliding window according to claim 11, characterised in that the window sash lying on top has a guard rail (44) as entrainment element (43), into which the entrainment element (43) of a window sash lying thereunder engages during coupling succession.
13. The roof sliding window according to any one of claims 11 or 12, characterised in that the entrainment element (43) of the window sash lying thereunder is formed as a pivot-mounted roller (42).
14. The roof sliding window according to claim 12, characterised in that the guard rail (44) has a U-profile as seen in a cross-sectional view.
15. The roof sliding window according to any one of claims 12 or 14, characterised in that the guard rail (44) is aligned in an oblique manner as seen in the direction of movement.
16. The roof sliding window according to any one of the preceding claims, characterised in that each of the window sashes has a toothed rack (38, 39, 40) which can be brought into operative connection with a drive (32) for displacing the window sashes in/into the window opening, the drive (32) being, in particular, an electromotive drive.
17. The roof sliding window according to any one of the preceding claims, characterised by a sensor for detecting the position of a window sash that has been displaced into the window opening.

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