EP1237457B1 - Cleaning device for the surface of a facade - Google Patents

Abstract

A cleaning device ( 9 ) for a facade surface ( 3 ) of a building ( 1 ), comprising at least one elongate wiper strip unit ( 10 ) movable back and forth along at least one guide rail unit ( 6 ) by means of a stationarily arranged drive motor ( 45 ), the wiper strip unit extending at right angles to the guide rail unit ( 6 ), and comprising at least one cleaning fluid line ( 29 ) with which spray nozzles ( 31 ) directed towards the surface ( 2 ) to be cleaned are connected; for a simple, space-saving design thereof, the wiper strip unit ( 10 ) includes at least one carrier ( 19 ) slidingly guided in the guide rail unit ( 6 ), the carrier being tightly connected to a linear driving element ( 32 ), e.g. a toothed belt ( 33 ) that is movable along the guide rail unit ( 6 ), the stationarily arranged drive motor ( 45 ) being associated with this driving element.

Description

The invention relates to a facade cleaning device for a facade surface of a building, with at least one with At least with the help of a stationary drive motor a guide rail unit provided on the facade surface can be moved back and forth, elongated, extending at right angles to the guide rail unit Wiper strip unit and with at least one cleaning liquid line, with the surface to be cleaned directional spray nozzles are connected.

Such a cleaning device is from the EP 709 054 A known, in one embodiment of these known Cleaning device the wiper strip unit over the Height of the facade horizontally and vertically along another is moved by guide rails attached to the facade become. The wiper strip unit of this known cleaning device is equipped with its own motors, on the one hand the wiper strip unit along the guide rails in which driven gears engaged with a stationary rack stand, and on the other hand to drive a pump to cleaning liquid over the in the area of the wiper strip provided spray nozzles against the surface to be cleaned squirt. This known cleaning device is therefore quite elaborate in construction, but the effort is all the more difficult is more important than several such cleaning devices per facade be arranged side by side and with each of these Cleaning devices a wiper strip unit with its own Motor drive etc. is present. In addition, the type of a wagon movable wiper strip units, caused by the installation of the two motors and the pump for the cleaning liquid, relatively voluminous, but desirable would be that the cleaning devices change the look of the Do not or not significantly impair building facades.

A window cleaning device is known from EP 0 047 344 A1 known in which a spray and / or wiping unit with Using a spindle and a nut mounted on the spindle, which is rigidly connected to the spraying or wiping unit, is slidable along the window pane. Such a spindle drive is relatively complex and massive, and this is all the more true more when a spindle drive extends over the entire height of a Building - in the case of a facade cleaning device must, whereby there is also a high risk of self-locking given is.

In US 4,257,138 A there is a comparable automatic Window cleaning device described, in which a cleaning unit by means of a window pane arranged on both sides Spindles is slidably mounted. In addition there is one Brush unit provided, which can be rotated via a bevel gear drive is driven. Here again, there is a complex process Construction of the drive of the cleaning unit.

DE 39 23 070 A is a window cleaning device with a cleaning element movably arranged on a window frame shown which one between two rubber strips Contains brush. In the space between the rubber strips a cleaning solution is supplied from the side, which is but especially in the case of larger widths of the ones to be cleaned Area only distributed unevenly across the width.

Finally, from EP 302 343 A is a window cleaning system especially known for motor vehicles, in which a windshield wiper using two opposing belts as Drive means can be moved back and forth along a disk. Here, with the help of opposing bands, an inclination of the wiper are made possible, but one pretty elaborate drive device is obtained, which itself only suitable for small window panes.

The aim of the invention is now a cleaning device of the type mentioned at the beginning, which provide a simple, has efficient training that takes up little space, so that it hardly catches the eye on a building facade, and the also simply on existing building facades afterwards can be attached. In addition, the danger of a Jamming or self-locking of the drive must be low.

The cleaning device according to the invention of the above Art is characterized in that the wiper strip unit at least one in the guide rail unit has slidably guided driver, which with a along the Guide rail unit movable linear drive element fixed is connected to which the stationary drive motor is assigned is. With such a construction, the above Objective met in an advantageous manner, wherein in particular the wiper strip unit is comparatively compact and can be kept small because they have no drive units has to record. The linear drive element that goes back and forth is driven in the guide rail unit recorded, and it can be, for example, a drive cable, a drive belt or the like, preferably by one Trade timing belts; this drive element is fixed to the driver the wiper strip unit coupled, which is thus by the Drive element is driven back and forth and at its Move the actual wiper strip unit along the cleaning facade surface. Here, the risk of Self-locking of the drive compared to known spindle drives be significantly reduced, which also means time and Costs for any repair or maintenance work reduced become. In the case of small versions, it would be theoretical conceivable that only one side on the wiper strip unit such driver is present, so that the wiper strip unit from Carrier, i.e. cantilevered from the guide rail unit; this would also be conceivable especially if the back and forth Horizontal movement of the wiper strip unit with the driver is. However, preferably - with regard to the then simpler guide construction - a vertical movement of the Wiper strip unit provided, the wiper strip unit also a corresponding width, for cleaning larger facade areas in a cleaning process, so that it then It is expedient to take drivers at both ends of the wiper strip unit to attach the wiper strip unit on both sides in Guide rail units to guide. The drive elements in the Guide rail units can be of a common stationary Drive motor, via appropriate gears and shafts, are driven, so that the related effort is additional is reduced, apart from being a stationary one Drive motor already the design effort for the cleaning device helps reduce.

As already mentioned, the drive element could, for example be a rope or a strap, although it is also conceivable would be to unwind this drive element from drums or on Reeling drums when the wiper strip unit goes back and forth should be moved. For efficient, space-saving training However, it has proven to be particularly advantageous if the drive element is an endless drive element, which by two beyond the reversal points of the movement stroke of the wiper strip unit stationary wheels or the like. Looped is one of which can be driven by the drive motor is.

If the wiper strip with a correspondingly rigid strip body or support body is formed, it can directly with connected to the driver, so that no further constructive Measures for attaching the wiper strip are required are. However, to remove the wiper strips that wear during operation, to be able to train as a simple wear part, as well as in With regard to one for protection reasons as well as for optical reasons desired cladding, however, it is particularly advantageous if the driver is connected to a housing of the wiper strip unit is in which a wiper strip is attached, which with one long side protrudes through a slot opening of the housing. To ensure assembly tolerances in the area of the guide rail units as well as the carriers listed therein, which may the distances between the guide rail units vary too easily to be able to compensate, it is further favorable if the housing with the driver in its longitudinal direction adjustable, e.g. connected via a pin-slot arrangement is.

So that the wiper strip without excessive stress Obstacles present on the facade surface to be cleaned can be easily moved away, it is also advantageous if the wiper strip in the housing towards the surface to be cleaned and is movably received back. It is with regard to a simple, effective construction also cheap if the Wiper strip resilient towards the slot opening of the housing is biased. It is particularly advantageous to achieve one controlled evasive movement of the wiper strip when the Wiper strip with an opening from the side of the housing projecting cam follower is connected, if necessary at least one control cam is assigned which is in the area of a projecting horizontally relative to the plane of the surface to be cleaned Part of the facade, like a connecting profile between Glass panes is arranged, the wiper strip when driving over of the projecting facade part by the over the Control cam moving cam follower can be moved back in the housing. It is also to achieve smooth movement advantageous if the cam follower with a freely rotatable Role is formed. For the sake of a simplified Assembly, it is also favorable if the control cam on the Guide rail unit is attached.

For an efficient coupling of the driver to the drive element then it turned out to be useful if the driver with several, e.g. two, firmly connected Clamping parts is formed, between which the drive element is fixed. It is also a safe one Carrying the driver while avoiding slipping particularly advantageous if one of the clamping parts has one on it has fixedly arranged toothed rail part, which with that as the drive element provided toothed belt is engaged.

For simple training and assembly of the guide rail unit it is also advantageous if the guide rail unit through interconnected, defining several channels Profiles is formed, being in a channel through a longitudinal slot is guided by it protruding outwards. In particular it is favorable here if the guide rail unit is a Base profile set up for attachment to the facade and a connected cover profile, which has a through Cover strip closed receiving channel for the cleaning liquid line contains.

The spray nozzles can with the present cleaning device Appropriately stationary on profiles on the facade or the like. For example it is conceivable, in the case of a vertically moving wiper strip unit the spray nozzles on above or between the glass surfaces existing building profiles of the building facade to be installed stationary. For particularly easy assembly, in particular for a later installation on an existing one Building, however, it has proven beneficial if the Spray nozzles attached to the guide rail unit are. It is in the case of the formation of the guide rail unit consisting of base profile, cover profile and cover strip cheap if the spray nozzles are attached to the cover strip and through this cover strip with the cleaning liquid line are connected. The spray nozzles are with their nozzle openings to the associated facade surface to be cleaned directed, and for cleaning - by opening a valve, e.g. Solenoid valve, in the supply line - with the help of a stationary pump cleaning fluid supplied under pressure.

To a possible pressure drop that increases with increasing distance the spray nozzles from the cleaning liquid pump, to compensate, it is also advantageous if the Spray cross sections varying spray nozzles along the guide rail unit and / or have varying mutual distances.

In the case of an endless drive element, its returning To keep the strand away from the driver, it should be when starting off or when stopping the wiper strip unit Vibrations in the drive element, it is furthermore favorable if the base profile with at least one L-shaped in cross section Ledge ledge a guide channel for the retracting Defined strand of the endless drive element.

To prevent unwanted moisture penetration, in particular also the cleaning fluid, in the assembly area of the To counteract guide rail unit, it is ultimately from Advantage if the base profile is facing away from the cover profile Back has receiving channels for seals.

Fig.1 eine schematische Ansicht einer Fassade mit zu reinigenden Glasflächen eines Gebäudes, mit pro vertikaler Glasflächenreihe vorgesehenen Reinigungsvorrichtungen mit vertikal verfahrbaren Wischerleisteneinheiten;

Fig.2 einen schematischen horizontalen Teilschnitt durch eine solche Reinigungsvorrichtung, etwa gemäß der Linie II-II in Fig.1, mit einer abgebrochen dargestellten Wischerleisteneinheit an einer nur schematisch gezeigten Glasfläche;

Fig.3 eine schaubildliche Ansicht des in Fig.2 ersichtlichen Teils der Reinigungsvorrichtung von schräg oben;

Fig.4 eine schematische, teilweise auseinandergezogene Darstellung der Reinigungsvorrichtung gemäß Fig.2 und 3; und

   die Fig.5,6 und 7 in schematischen Stirnansichten eine Wischerleisteneinheit über einem Ausschnitt einer zu reinigenden Fassadenfläche beim Überfahren eines Hindernisses, d.h. vorspringenden Fassadenteils, an der Fassadenfläche, wobei in Fig.5 die Situation noch vor Beginn des Überfahrens des Hindernisses gezeigt ist, in Fig.6 die anfängliche Phase des durch einen Steuernocken gesteuerten Überfahrens veranschaulicht ist und in Fig.7 die Wischerleiste in der durch den Steuernocken vollständig abgehobenen Position beim Überfahren des Hindernisses dargestellt ist.The invention is explained in more detail below on the basis of preferred exemplary embodiments illustrated in the drawing, to which, however, it is not intended to be limited. They show in detail:

1 shows a schematic view of a facade with glass surfaces of a building to be cleaned, with cleaning devices provided for each vertical glass surface row with vertically movable wiper strip units;

2 shows a schematic horizontal partial section through such a cleaning device, approximately along the line II-II in FIG. 1, with a wiper strip unit shown broken off on a glass surface which is only shown schematically;

3 shows a perspective view of the part of the cleaning device shown in FIG. 2 obliquely from above;

4 shows a schematic, partially exploded view of the cleaning device according to FIGS. 2 and 3; and

FIGS. 5, 6 and 7 show, in schematic end views, a wiper strip unit over a section of a facade surface to be cleaned when passing over an obstacle, ie projecting facade part, on the facade surface, the situation in FIG. 5 being shown before the obstacle begins to be passed over, 6 shows the initial phase of the overrun controlled by a control cam and FIG. 7 shows the wiper strip in the position completely lifted by the control cam when the obstacle is passed over.

1 is a very schematic view of a building 1 illustrated with glass surfaces 2 to be cleaned on a facade surface 3. The glass surfaces 2 are vertical profile rails 4 and horizontal joints or connecting profiles 5 separated from each other or laterally limited. The vertical profile rails 4 form from Figures 2 and 3 more clearly Guide rail units 6 over the entire height of the facade 3 run continuously, and that, as can be seen from Fig.2 is connected to each other on the individual glass surfaces 2 Connection profiles 7 attached, e.g. are screwed on, as in 2 is indicated schematically at 8.

The guide rail units 6 belong to cleaning devices 9, each containing a wiper strip unit 10, the Movable up and down along the guide rail units 6 are, as indicated in Fig.1 by the arrows 11. According to 2 is each wiper strip unit 10 with one made of one narrow (see also Fig.3), strip-shaped housing 12 on the latter the associated glass surface 2 facing narrow side a slot opening 13 (see FIG. 5) passing through the wiper strip or lip 14 provided with a profile surround according to FIG 15 provided and horizontally reciprocable in the housing 12 is arranged, as in Figures 4 and 5 with the double arrow 16 is indicated.

As is further illustrated schematically in FIG. 5, the wiper strip profile surround 15 by one or more Helical compression springs 17 are loaded into the outward position, a stop not shown in the drawing the outward movement of the wiper strip 14 with its profile surround 15 from the housing 12 in a conventional manner can. This horizontal mobility of the wiper strip 14 enables, as will be explained in more detail below with reference to FIGS. 5 to 7 will be explained, advantageously a controlled Driving over obstacles on the facade surface 3 when opening and closing Moving the wiper strip unit 10 of the cleaning device 9th

The wiper strip unit 10 is on each of its two End faces, e.g. 18 in Figure 2, with the help of a driver 19 in the associated guide rail unit 6 slidably guided. Hiezu is each guide rail unit 6 with vertical over the entire Facade-height channels 20 formed, each in each of these vertical channels 20 has a driver 19 Wiper strip unit 10 is slidably guided as this in particular in FIG. 2 in the case of the one shown in the left channel 20 Driver 19 within the guide rail unit 6 reveals. The right channel 20 in Figure 2 is for the purpose of better Clarity drawn blank, and it's on this side no wiper strip unit above the adjacent glass surface 2 ' illustrated. Of course, the next would be there Connect wiper strip unit 10 and with a corresponding one Driver 19 in the (right) channel 20 to be slidably guided.

Each guide rail unit points to the formation of the channels 20 6 a base profile 21, which on the connection profile mentioned 7 is fastened, for example, by means of screws 8. This basic profile 21 has L-shaped ledge projections or webs 22, one in each case protruding into a vertical channel 20; the The purpose of these webs 22 will be explained in more detail below. On the inside facing the facade 3 is the base profile 21 further with paired hook-shaped Profile projections formed, the pair of receiving channels 23 form for seals 24. This creates a sealed arrangement of the base profile 21 on the facade 3.

At central, web-like projections 25 of the base profile 21 then there is a cover profile 26, which in the central area for example by means of screws 27 with the base profile 21 is connected after the respective driver 19 in the associated Channel 20 was attached, cf. in this context also the exploded view of Figure 4.

The cover profile 26 has a central receiving channel 28 in which a cleaning liquid line 29, for example in the form of a hose. The recording channel 28 is after attaching the cleaning liquid line 29 completed by a cover strip 30, which in abutting Butt lengths laid together, and which with Spray nozzles 31 is provided, which with its nozzle opening are each directed towards glass surface 2 to be cleaned, cf. except Fig.2 and 3 also Fig.1, where such spray nozzles 31 schematically are indicated. These spray nozzles 31 are thus stationary attached to the guide rail units 6, and when the Glass surfaces 2 of the thread surface 3 are to be cleaned them over lines 29 using one in the drawing not illustrated pump cleaning fluid, in particular Water, fed under pressure, so that the cleaning liquid is sprayed onto the glass surfaces 2. Then drive the wiper strip units 10 - preferably together in one Line as shown in Fig.1 - from top to bottom, being clean the glass surfaces 2; wipe in the subsequent upward stroke the wiper strip units 10 more or less the glass surfaces 2 dry so that after this work cycle cleaned and dry glass surfaces 2 are present.

For this up and down procedure of the wiper strip units 10 under the guidance of their drivers 19 in the channels 20 of the guide rail units 6 is an endless for each driver 19 Drive element 32, for example in the form of a toothed belt 33, intended. This toothed belt 33 is with one strand 34 between two firmly together, for example by screwing, as indicated in Fig.2 at 35, connected clamping parts 36.37 of the two-part driver fixed, cf. also 4, so that the toothed belt 33 with its strand 34 at its back and forth movement (see also double arrow 38 in Fig. 4) the driver 19 moves up and down without slipping, all the more so the wiper strip unit 10 firmly connected to the driver 19 to move up and down on the facade. The one clamping part 37 equipped with a fixed toothed rail part 19 'or be formed with which the toothed belt 33 is engaged.

The idling run 39 of the toothed belt 33 runs without contact back with the driver 19 in the respective channel 20, wherein by the above-mentioned, in cross-section L-shaped ledge projections 22 in pairs a guide channel 40 for this returning strand 39 is formed. The facade surface 3 parallel leg of the ledge projection 22 forms one Limitation of the guide channel 40 to the respective driver 19, so that the strand 39 of the toothed belt 33 from the driver 19 or whose inner clamping part 37 - the one with a corresponding cutout 41 is provided, s. Fig.2 - is kept away.

As indicated only schematically in Fig.1, are for the endless toothed belts 33 on the top of the facade surface 3 as well as on the underside of which gears 42 and 43 are provided, over which the endless toothed belts 33 are looped; this Gears 42, 43 can each sit on a shaft and so run around together; at least it is envisaged that the one e.g. upper, gears 42 on a common drive shaft sit that only very schematically with a dashed line 44 is indicated, and also only very schematically by one illustrated stationary motor 45 driven becomes.

In FIG. 1 there is also a supply line 46 with a Shut-off valve 47 for the cleaning liquid to the spray nozzles 31 shown. It is also shown that in addition or instead of of the spray nozzles 31 on the vertical guide rail units 6 also on horizontal connecting profiles 5, or at the top Profile 5 ', downward spray nozzles 31' for application of cleaning fluid to be attached to the glass surfaces 2 can. Such spray nozzles 31 'can also, even if this is not shown in Figure 1, on the intermediate connection profiles 5 be mounted between the glass surfaces 2, and not only with a downward orientation, but also with one Alignment of the nozzle openings upwards.

As can also be seen from FIG. 2, the driver shows 19 a plate-shaped fastening part 48, which over a connecting web 49 through a lateral, vertical longitudinal slot 50 between the two profiles 21,26 protrudes through the guide rail unit 6 with the one clamping part 37 of the driver 19 is firmly connected. The plate 48 is with itself in the longitudinal direction of the wiper strip unit 10 extending elongated holes 51, in each of which one - in Fig.2 only schematically illustrated - pin 52 added which is fixed to the housing 12 of the wiper strip unit 10 is connected, which ensures horizontal mobility of the housing 12 relative to the driver 19 through this pin-slot arrangement 52, 51 is secured. Of course there is such pin-slot arrangement 52, 51 only on one side of the Wiper strip unit 10 is necessary, however, on the other, side of the wiper strip unit, not shown in the drawing 10 the plate 48 can be firmly connected to the housing 12, for example by screwing or welding or riveting. The horizontal given by the pin-slot arrangement 52, 51 Any manufacturing and Installation tolerances when attaching the guide rail units 6 on the facade 3 should be compensated for of these tolerances the adjacent guide rail units 6, between which there is the respective wiper strip unit 10 extends, not a constant distance over the entire Have height of building 1.

As already mentioned above, the wiper strip 14 is in the Housing 12 of the wiper strip unit 10 inwards and outwards arranged adjustable, the spring 17, the wiper strip 14 abroad, i.e. against the glass surface 2, presses. This can the wiper strip 14 in the event of obstacles on the facade surface 3 move into the housing 12 so that its front Lip part 53 (see Fig. 5) is protected. About this withdrawal movement can control in the area of such obstacles, i.e. projecting facade parts, on the facade surface 3, for example through the horizontal connection profiles already mentioned 5 are formed between the glass surfaces 2, Control cams 54 are attached to the guide rail unit 6, see. in particular also Figures 3 and 4 and Figures 5 to 7. This Control cams 54 can each be attached to the cover profile 26, for example screwed. The profile surround 15 of the respective wiper strip 14 is also with a bearing part 55 for a freely rotatable roller 56 provided as a cam follower connected. When moving the wiper strip unit 10 up and down, when the toothed belt 33 is driven, the roller 56 thus runs against the respective control cam 54, which with corresponding Ramps 57.58 is formed, lifting the wiper strip 14 from the glass surface 2 or more precisely from the obstacle, i.e. from the connection profile 5, cf. the different phases of this Lift off and run over according to the Fig. 5,6 (where the roller 56 just rolls over the upper ramp 57) and Fig. 7 (according to which the Roller 56 the wiper strip 14 has fully retracted). In connection the compression spring 17 shown only in FIG Wiper strip 14 when they are on the ramp 58 to the guide rail unit 6 moved back to the glass surface 2 so that she can continue her cleaning activity there.

The spray nozzles 31 can extend over the height of the building 1 have varying nozzle cross-sections or distances to one Pressure drop across the height of line 29 or the facade 3 results in balancing; in the arrangement according to FIG. 1 according to which the spray nozzles 31, the higher they are arranged, all the closer to each other, and they can too have smaller nozzle openings so that the cleaning liquid even at greater heights on the glass surfaces 2 is injected.

Claims (21)

1. A cleaning device (9) for a facade surface (3) of a building (1), comprising at least one elongate wiper strip unit (10) movable back and forth along at least one guide rail unit (6) provided at the facade surface by means of a stationarily arranged drive motor (45), the wiper strip unit extending at right angles to the guide rail unit, and further comprising at least one cleaning fluid line (29) with which spray nozzles (31) directed towards the surface to be cleaned are connected, characterised in that the wiper strip unit (10) comprises at least one carrier (19) slidingly guided in the guide rail unit (6), the carrier being fixedly connected to a linear driving element (32) that is movable along the guide rail unit (6), the stationarily arranged drive motor (45) being associated with this driving element.
2. A cleaning device according to claim 1, characterised in that a toothed belt (33) is provided as the driving element (32).
3. A cleaning device according to claim 1 or 2, characterised in that the driving element (32) is an endless driving element which is wound about two wheels or the like (42, 43) stationarily arranged beyond the points of reversal of the movement stroke of the wiper strip unit (10), one of these wheels or the like being drivable by the drive motor (45).
4. A cleaning device according to any one of claims 1 to 3, characterised in that the carrier (19) is connected to a housing (12) of the wiper strip unit (10), in which a wiper strip (14) is mounted which projects with a longitudinal side thereof through a slot opening (13) of the housing (12).
5. A cleaning device according to claim 4, characterised in that the housing (12) is connected to the carrier (19) so as to be displaceable in its longitudinal direction.
6. A cleaning device according to claim 5, characterised in that the housing (12) is connected to the carrier (19) via a pin/long hole arrangement (52, 51).
7. A cleaning device according to any one of claims 4 to 6, characterised in that the wiper strip (14) is received in the housing (12) so as to be movable towards and away from the surface (2) to be cleaned.
8. A cleaning device according to claim 7, characterised in that the wiper strip (14) is resiliently biased in the direction towards the slot opening (13) of the housing (12).
9. A cleaning device according to claim 7 or 8, characterised in that the wiper strip (14) is connected to a cam follower laterally projecting from the housing (12) through an opening thereof, which cam follower optionally has at least one associated control cam which is arranged in the region of a facade part that projects horizontally relative to the plane of the surface (2) to be cleaned, such as a joining section between panes of glass, the wiper strip (14) being rearwardly movable in the housing (12) by the cam follower moved over the control cam when the wiper strip is travelling over the projecting facade part.
10. A cleaning device according to claim 9, characterised in that the cam follower is designed with a freely rotatably mounted roller.
11. A cleaning device according to claim 9 or 10, characterised in that the control cam is mounted on the guide rail unit (6).
12. A cleaning device according to any one of claims 1 to 11, characterised in that the carrier (19) is designed with several tightly interconnected clamping parts (36, 37) between which the driving element (32) is fixed.
13. A cleaning device according to claim 12, characterised in that the carrier (19) is designed with two clamping parts (36, 37).
14. A cleaning device according to claim 12 or 13, characterised in that one of the clamping parts (37) includes a toothed rail part (19') fixedly arranged thereon, which is engaged with the toothed belt (33) provided as the driving element (32).
15. A cleaning device according to any one of claims 1 to 14, characterised in that the guide rail unit (6) is formed by interconnected sections (21, 26) defining several channels (20, 28), the carrier (19) being guided in one channel (20) and projecting outward from the guide rail unit through a longitudinal slot.
16. A cleaning device according to any one of claims 1 to 15, characterised in that the guide rail unit (6) includes a base section (21) adapted to be fastened to the facade and a cover section (26) connected to the base section, which cover section contains a receiving channel (28) provided for the cleaning fluid line (29) and closed by a lid ledge (30).
17. A cleaning device according to any one of claims 1 to 16, characterised in that the spray nozzles (31) are stationarily arranged on the guide rail unit (6).
18. A cleaning device according to claim 17, characterised in that the spray nozzles (31) are mounted on the lid ledge (30) and connected to the cleaning fluid line (29) through this lid ledge (30).
19. A cleaning device according to claim 14 or 15, characterised in that the spray nozzles (31) have nozzle cross-sections varying along the guide rail unit (6) and/or varying mutual spacings.
20. A cleaning device according to any one of claims 15 to 19, characterised in that the base section (21) defines a guide channel (40) with at least one ledge projection (22) of L-shaped cross-section for the returning run (39) of the endless driving element (32).
21. A cleaning device according to any one of claims 15 to 20, characterised in that the base section (21) has receiving channels (23) for seals (24) at its rear side facing away from the cover section (26).

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