WO2007122237A2

WO2007122237A2 - Device for cleaning ground surfaces

Info

Publication number: WO2007122237A2
Application number: PCT/EP2007/054001
Authority: WO
Inventors: Wolfgang Krumm; Hubert Schulte
Original assignee: Airmatic Gesellschaft für Umwelt und Technik mbH
Priority date: 2006-04-25
Filing date: 2007-04-24
Publication date: 2007-11-01
Also published as: EP2012642A2; DE202006006573U1; WO2007122237A3

Abstract

Disclosed is a device (1) for cleaning soiled ground surfaces (6), especially traffic surfaces. Said device (1) comprises at least one driven cleaning tool which is disposed underneath a hood (2) and mechanically acts upon the surface that is to be cleaned. A brush encompassing a brush cup and/or several brush cups (8, 8', 8") that are rotatably connected to a brush cup holder (7) in a preferably star-shaped arrangement is/are used as a cleaning tool. The inventive device (1) further comprises at least one hot vapor feed pipe with a brush or bristles (13, 13', 13") which is/are retained within the brush cup (8, 8', 8"), or the hot vapor feed pipe is provided with a vapor outlet that is placed between the brush cups (8, 8', 8") within the hood.

Description

Device for cleaning floor surfaces

The invention relates to a device for cleaning contaminated floor surfaces, in particular of traffic areas with arranged under a hood, mechanically acting on the surface to be cleaned, driven cleaning tools, being provided as cleaning tools several, rotatably connected in a preferably star-shaped arrangement on a brush divider holder brush plate are.

Devices for cleaning floor surfaces, with which particularly heavily contaminated floor surfaces are to be cleaned, have motor-driven cleaning tools, in which cleaning tools are typically rotating brush plates. Due to the mechanical drive of these brush plates, these act with their bristles mechanically on the floor surface to be cleaned and remove the contamination. Particularly stubborn contaminants, such as dried sticky substances, such as chewing gum, can not be removed from soil surfaces by mechanical means alone, at least not completely. For this purpose, cleaning devices have been developed, which in addition to the mechanical cleaning tools have means for supplying a cleaning liquid and / or for supplying steam. Such a device has become known from WO 2004/017805 A1. In this known Abreinigungsvorrichtung a cleaning agent or steam outlet is upstream of the cleaning tools in the direction of movement of the device. The upstream of the detergent or steam outlet serves the purpose so that the detergent and the steam can act on the substance to be cleaned for a few seconds before the cleaning tools acting mechanically on the floor surface to be cleaned are replaced by the impurities and mechanically on the Impurity to remove it act. The purpose of supplying steam is to heat the substance to be cleaned to facilitate removal thereof. If the substance to be removed from the bottom surface is a bonded chewing gum or, for example, a resin, the heating serves the purpose of to bring the substance to be removed to a temperature above its decomposition temperature. Only then is it ultimately ensured that this substance can be removed from the floor surface. In the previously known cleaning devices, however, it has been shown that the desired cleaning effect does not occur in many cases and that residues of the substance to be cleaned remain on the bottom surface.

Based on this discussed prior art, the invention is therefore based on the object of further developing an aforementioned cleaning device in such a way that a cleaning of floor surfaces, in particular of traffic areas, is improved.

This object is achieved on the one hand by a cleaning device mentioned at the outset, in which the device comprises at least one hot steam feed with a steam outlet opening arranged within the brush or bristle held by the brush plate.

This object is further achieved by an abreinigungsvorrichtung mentioned above, in which the device comprises at least one hot steam supply with a arranged within the hood between the brush plates steam outlet opening.

Is used in these cleaning machines due to the rotation of the brush plate or the brush or bristle divider holder with it typically star-shaped brush plates adjusting, radially outward suction, through which the steam guided targeted the rest on the ground to be cleaned Beborstung of or the cleaning tools is supplied.

According to the first proposed solution, the steam outlet opening of the superheated steam supply is arranged within the brush carried by a brush divider holder. As a brush is preferably a ring brush. As a result of the rotational movement of the bristles developed within such a brush in a radially outward directed suction, through which the supplied superheated steam is supplied to the working on the surface to be cleaned brush ends. The cleaning device according to the second proposed solution has a hot steam supply with a disposed within the hood between the brush plates steam outlet opening. This is particularly suitable for those cleaning devices that have several cleaning tools. An arrangement of the steam outlet opening between the typically star-shaped arranged on the brush divider holder brush plates as cleaning tools has the advantage that the exiting steam due to the rotational movement of the brush plate and the consequent air movement due to centrifugal force is moved outwards and thus to the bristles of the brush plate. This creates the above-described suction. The rotational movement of the brush divider holder is thus responsible for the vapor distribution and leads to a distribution of steam within the hood, in which the supplied hot steam is brought directly to the ground surface to be cleaned off. The hot steam passes in this way directly to the bristles of the brush plates, in the region of their bottom-side support and thus to the point where the mechanical action on the substance to be cleaned takes place. In contrast to previously known cleaning devices, a simultaneous thermal and mechanical action on the substance to be cleaned takes place in this cleaning device. This was not possible in the cited prior art, in which the steam supply in the working direction in front of the brush is arranged, since due to the rotational movement of the brushes of the introduced steam is accelerated to the hood side walls. In the device according to the invention, a chewing gum which is located on a floor surface which is to be cleaned off, for example, is thus brought to a temperature which is above its decomposition temperature by the supplied superheated steam under simultaneous mechanical action of the cleaning tools. For a chewing gum, the decomposition temperature is about 100 ^° C. The supplied steam therefore has a temperature of at least 100 ^° C. Due to the simultaneous mechanical action of the bristles of the brush plates on the chewing gum, this is successively removed with continuous supply of steam. The described embodiment of the cleaning device ensures that during the entire time of the mechanical action of the cleaning tools on the contaminant to be removed, for example, the chewing gum which has seeped is exposed to supplied superheated steam and thus at any time of the cleaning of the abradable surface area is above its decomposition temperature. By virtue of this measure, the steam production can be reduced to a minimum since, in contrast to previously known cleaning devices, the substance or object to be cleaned does not have to be heated until the mechanical treatment of the substance to be cleaned is started after expiry of the exposure time. The same applies to a supply of any cleaning agents.

A combination of the prescribed hot steam supply is possible.

According to one embodiment of this cleaning machine, it is provided that the brush divider holder is rotationally driven via a hollow shaft. The hollow shaft has a lower opening located below the brush divider holder. The hollow shaft is used as a channel for the steam supply. Thus, the superheated steam needed for cleaning can be brought directly into the area between the individual brush plates in a simple manner. This can be done directly in the hollow shaft itself or by a arranged in the hollow shaft separate steam supply. In the latter case, it is expedient if the separate steam supply line is thermally insulated from the hollow shaft in order to minimize a temperature loss over this distance. The hollow shaft and / or a channel insert inserted in the hollow shaft extend in accordance with a preferred embodiment of this cleaning machine with an extension beyond the underside of the brush divider holder. The hot steam flowing into the hood then leaves the supply line only shortly above the floor surface to be cleaned off. In a further development, it is provided that a supply of superheated steam not only takes place in the area between the brush plates, but is also provided in the bristle plates.

When providing a brush divider holder to which a plurality of brush plates are connected, if the brush plates have steam outlets, the brush divider holder has hot steam supply passages connected to a prescribed hot steam supply and in directed to the brush plates inside the bristles to be cleaned surface.

In a further development of this cleaning device, it is provided that a preheating hood is arranged in front of the hood with the cleaning tools. This serves the purpose that heat is supplied under this to be cleaned off the bottom surface and thus the bottom surface is preheated. As a result, a cleaning can be improved. The preheating is advantageously carried out by supplying superheated steam from the already existing hot steam supply. The superheated steam is preferably applied evenly over the areal extent of the preheating hood in the direction of the ground to be cleaned, for example by providing a pipe which has several meanders and extends over the width of the preheating hood, into which numerous vapor outlet openings are made.

A further improvement of the cleaning effect can be achieved if an exhaust is arranged between the preheating hood and the hood with the actual mechanical cleaning tools. By means of this suction, the steam condensed out in the preheating as a result of a steam feed is to be sucked off in the form of water from the surface to be cleaned. Thus, the transported by the steam heat remains in the ground surface to be cleaned, without this is covered with a liquid coating. The steam supplied under the hood enclosing the cleaning tools then immediately reaches the preheated surface to be cleaned.

According to a further embodiment, the brush plates are decoupled with respect to their rotatability from the drive of the brush divider holder. This measure, which can be taken alone or in combination with one or more of the aforementioned measures, on the one hand has the advantage that a mechanical drive of the individual brush plates, as provided in the prior art, is not required. Rotary driven according to this embodiment, only the brush holder. The star-shaped arranged to the rotational axis of the brush divider holder brush plate have in this embodiment, an annularly arranged bristles. From the bristle ring of this brush tenteller is then edged an unbeborsteter interior. A rotating movement of the brush divider holder has, in the case of a rotatable connection of the brush plates to the brush divider holder, as provided in this embodiment, the result that the brush plates are nevertheless caused to rotate as a result of their bottom-side support. During this rotational movement, the bristle ends are rolled in different directions in the course of each complete revolution of the brush plate. This has the consequence that the bristles are not subject to a one-sided wear and then over the life of a brush tent or the bristles of the brush plate a constant mechanical cleaning force can be exerted on the ground surface to be cleaned.

It is advantageous in one of the above-described cleaning devices when the brush plates are suspended resiliently relative to the brush divider holder. The resilient suspension of the brush plates relative to the brush holder has the advantage that the brushes act on the surface to be cleaned, regardless of the topography of the bottom surface, with a largely constant contact pressure. This is considered essential if a consistent and over the surface of the cleaning tools same cleaning result to be achieved. In many cases, the floor surfaces to be cleaned have unevenness, which then results in a different, in particular partially lower, contact pressure of the brushes of the brush plates on the floor surface to be cleaned. Consequently, the acting mechanical force for removing, for example, a chewing gum that has seeped is sometimes too small to remove it completely. The proposed resilient suspension of the individual brush plates relative to the brush divider holder can counteract this disadvantage. Particularly useful is a resilient suspension of the brush plate on the brush divider holder, in which they can be tilted against the brush divider holder against the force of the spring elements used for the resilient mounting. With cleaning tools designed in this way, even uneven floor surfaces can be effectively cleaned, it being ensured that, even with such floor structures, each brush plate rests on its surface resting on the floor with a largely identical contact pressure. A springy suspension of the individual brush plate allows this suspension is adjustable with respect to the force acting on the brush plate and thus by the bristles of the brush plates on the ground surface to be cleaned off. By means of this measure, the force of the mechanical action of the cleaning tools on the surface to be cleaned off can be adjusted as a function of the contamination to be removed. Contaminants which can be removed with less mechanical force can therefore be removed with a setting of the cleaning device, in which the brushes only touch the bottom surface with a low contact pressure. As a result, the wear of the bristles of the brush plates can be reduced. Such an adjustment also allows wear of the bristles of the brush plates to be compensated for by effectively adjusting the resilient suspension in which they lose their effective length and thus reduce the force acting on the bottom surface. In principle, it is also possible to suspend brush plates as cleaning tools in a manner such that they can be adjusted with respect to their height to be cleaned ground surface and thus with respect to the force exerted by the bristles on the abzureinigende bottom surface contact pressure independent of the provision of a resilient suspension with the aforementioned advantages is.

The invention is described below with reference to an embodiment with reference to the accompanying figures. Show it:

1 shows a cross-sectional view of a cleaning device,

2 shows a schematic representation of the device of FIG. 1 illustrating the mobility of the cleaning tools, FIG.

3 shows a top view of the cleaning device of FIG. 1 and FIG

4 shows a schematic representation of the cleaning device of FIG. 3 with a preheating hood.

A cleaning device 1 is shown with its front cleaning part in the figures. The cleaning device 1 comprises a housing be 2, which includes a working space 3. The hood 2 carries at its lower end a circumferential skirt 4. The skirt 4 is made of an elastic material and ends just before the surface of the abreinigerigen- the bottom surface 6. In other embodiments, the apron extends to the bottom surface and grinds on this. Within the hood 2, three individual brush plates 8, 8 ', 8 "are arranged on a brush-divider holder 7 in a star-shaped arrangement provided in the illustrated embodiment The brush divider holder 7 is rotatably driven by means of an electric motor 9. For transmitting the rotary motion of the drive shaft of the The hollow shaft 10 is mounted and held in a drive housing 11 with the electric motor 9. The drive housing 11 is in the vertical direction with respect to the generally designated by the reference numeral 12 frame of the cleaning device 1, as by 1, by means of the device of the drive housing 11 in the vertical direction and the consequent device in the vertical device of the hollow shaft 10, the brush divider holder 7 arranged at the lower end of the hollow shaft 10 can likewise be set up accordingly.

A brush plate 8, 8 ', 8 "is connected to each rotary arm of the brush divider holder 7. The brush plates 8, 8', 8" are rotatably mounted relative to the brush divider holder 7. However, the brush plates 8, 8 ', 8 "are not actively driven by the cleaning device 1. The brush plates 8, 8', 8" shown in the figures are those with an annular bristles 13, 13 ', 13 ", so that each brush plate 8, 8 ', 8 "includes a bristle-free interior 14. The brush plates 8, 8 ', 8 "are connected to the brush divider holder 7 by a respective rotary joint 15, 15' The rotary joint 15 itself is part of the brush holder holder 7. This has, as shown with reference to the rotary joint 15, a connection flange 16 The brush plate 8 is connected to the connecting flange 16 of the rotary joint 15 with a plurality of bolts 17. The bolts 17 are held on each side of the brush plate in a rubber element 18. The rubber elements 18 are pressed into a holding opening 19 and are adhesively fixed therein. tenteller 8 is suspended quasi floating relative to the hinge 15 and the brush divider holder 7 and therefore can be tilted relative to the plane of the brush divider holder 7. Such tilting occurs when the brush plate 8 strikes an unevenness of the bottom surface 6. In the illustrated embodiment, the brush plate 8 is tiltable in all directions relative to the rotary joint 15 and its connecting flange 16, to an extent as is possible by the rubber elements 18. It is clear that in the illustrated embodiment, the material properties of the rubber elements used 18 are responsible for the extent to which the brush plate 8 can be tilted with respect to the hinge 15 with its connecting flange 16.

The further brush plates 8 ', 8 "of the arrangement shown in Figure 1 are connected in the same manner to the brush divider holder 7 and adjustable with respect to this.

The tilting of the brush plates 8, 8 ', 8 "relative to the brush divider holder can also be achieved by other design solutions, for example by replacing the rubber element with a boring for the bolts by means of a rigid element, in which case the bolts are not The respective contact pressure of the brush holders 8, 8 ', 8 "on the bottom is then achieved, for example, by a spring acting against the connecting flange of the brush divider holder.

The hollow shaft 10 of the drive device serves to receive a steam supply line. The steam supply line protrudes from the underside of the hollow shaft 10 with an extension provided with the reference numeral 20 out. The introduction of steam into the hollow shaft 10, or the supply line extending in the hollow shaft 10 is not shown in Figure 1 for clarity and is located at a suitable location. The steam supply line serves the purpose of supplying superheated steam, in particular dry superheated steam, into the working chamber 3 of the cleaning device at temperatures of more than 100 ^° C. The extension 20 of the steam supply line serves the purpose of delivering the supplied steam close to the bottom surface 6 becomes. The steam therefore readily reaches the bristle ends of the bristles of the brush plates 8, 8 ', 8 "which are effective for mechanical removal of an impurity located on the bottom surface 6. Thermal energy is introduced into the working space 3 via the superheated steam, directly to the location, at which the mechanical removal of the contaminant, for example a chewing gum located on the bottom surface 6, takes place, in which cleaning device 1 a mechanical action takes place on the object to be cleaned or the substance to be cleaned, with simultaneous steaming. is in the working space 3 centrifugally generated by a radially outwardly pulling suction that promotes the supply of exiting from the extension 20 superheated steam to the brush plates 8, 8 ', 8 "out. Therefore, basically no further measures for a steam distribution are necessary. Nevertheless, the extension 20 of the steam supply line projecting from the hollow shaft 10 can carry vapor-conducting or vapor-emitting elements in order to support a supply to the mechanically active regions of the bristles of the brush plates 8, 8 ', 8 " In order to achieve the above-described suction effect for the distribution of steam, rotation speeds of more than 100 rpm are considered sufficient with its brush plate arrangement in the illustrated embodiment.

In an embodiment, not shown in the figures, the steam outlet opening is connected to the brush plate and rotated with this. If a cleaning device has several brush plates, it can be when each brush plate is assigned a steam outlet opening. Likewise, a combination of one or more stationary steam outlet openings, as they are characterized in the above-described embodiment with the extension 20, with such steam outlet openings are possible, which are associated with the brush divider holders and / or the brush plates. Furthermore, it is possible for a steam outlet opening to be arranged between individual brush plates, specifically in such a way that it rotates together with the brush divider holder carrying these brush plates. The inlet opening of a suction line 21 opens into the working chamber 3. The suction line 21 serves to suck off excess steam. If there is too much steam within the working space 3, it begins to condense due to its cooling and wets the floor surface 6 to be cleaned off, which in turn is associated with a cooling down. The hot steam emerging from the steam supply line then no longer acts directly on the object to be removed or the substance to be removed from the bottom surface 6, but first of all the condensation water located on the surface of the bottom surface 6. For this reason, in an operation of the cleaning device 1 of the illustrated embodiment, efforts are made in the working space 3 to ensure that there is not an excessive amount of steam contained therein. In addition, the steam extraction supports the distribution of steam over the floor area to be cleaned. The suction effect of the vapor extraction is favored when, between the area of the chewing gum dissolution and the aspiration, a partition wall (not shown in the figures) is drawn in which terminates just above the floor surface 6 to be cleaned leaving a small gap.

Figure 2 illustrates in the selected schematic representation of the suspension of the brush plates 8, 8 ', 8 "of the arrangement of Figure 1 and the resulting mobility of the brush plates 8, 8', 8" opposite the brush divider holder. 7

In a development of the device 1 described in FIGS. 1 and 2, whose brush plates 8, 8 ', 8 "have an annular bristles 13, 13', 13", it can be provided that a plurality of further, in diameter, are provided on the brush divider holder 7 smaller brush divider holders are connected, which in turn each carry one or more brush plates.

In the event that a steam supply is provided within a brush plate or within the bristles of a brush plate, to the steam supply serving hollow shaft 10 is connected to the brush holder 7 associated steam supply line through which the supplied via the hollow shaft 10 steam the brush plates or ever after refinement carried by this brush divider holder further Brush plate holders and then turn the brush plates is supplied. In such a case, the brush divider holder is associated with a rotary feedthrough through which the supplied superheated steam can be supplied to the brush plate rotatably connected to the brush divider holder 7 or the further brush divider holder.

It is clear from the top view of the cleaning device 1 of FIG. 1 that, in order to achieve a broader cleaning track, it has three devices arranged offset to one another, as described for FIGS. 1 and 2. From this representation it is also clear that the cleaning device 1 has a working chamber 3 in the direction of movement of the device downstream suction chamber 22. The direction of movement of the cleaning device 1 is indicated in FIG. 3 by a block arrow. The suction chamber 22 is separated from the working space 3 by a wall 23. The wall 23 is designed so that a gap remains between this and the top of the bottom surface 6 to be cleaned off. During operation of the cleaning device 1, the suction chamber connected to a suction device via the manner not shown in detail, which is loosened or removed by the mechanical processing of the bottom surface 6, is also sucked off, as are liquid residues remaining on the bottom surface 6.

FIG. 4 shows the cleaning device 1 of the preceding figures, which is equipped with an additional preheating hood 24. The preheating hood 24 is connected upstream of the hood 2 and the brush plates 8, 8 ', 8 "arranged underneath in the direction of movement of the preheating hood 24. The preheating hood 24 is used to preheat the floor surface to be cleaned , which is connected in a manner not shown in detail to a steam supply, preferably the one which also supplies the space under the hood 2 with steam via the extension 20. Towards the bottom of the floor to be cleaned, are pointing into the steam supply pipe 25 introduced numerous steam outlet openings.

Between the preheating hood 24 and the working space 3 limiting hood 2 is a suction chamber 26. The suction 26 is connected in a manner not shown to a suction device via the suction line 21. In an operation of the cleaning device 1 with the preheating hood 24 and the suction chamber 26 is condensed vapor via the suction chamber 26 and other loosely resting on the floor impurities or particles removed from the surface to be cleaned.

LIST OF REFERENCE NUMBERS

1 cleaning device

2 hood

3 workspace

4 apron

5 top

6 floor space

7 brush divider holder, 8 ', 8 "brush plate

9 electric motor

10 hollow shaft

11 drive housing

12 frame 3 ', 13 "ring brush

14 interior 5, 15 'swivel

16 connection flange

17 bolts

18 rubber element

19 holding opening

20 extension

21 suction line

22 suction chamber

23 wall

24 preheating hood

25 steam supply pipe

26 suction chamber

Claims

Patentansprϋche

1. A device for cleaning contaminated floor surfaces (6), in particular of traffic areas with at least one under a hood (2) arranged, mechanically acting on the surface to be cleaned, driven cleaning tool, being used as a cleaning tool, a brush with a brush plate (8, 8 ' , 8 "), characterized in that the device (1) has at least one superheated steam supply with a brush or sheath (13, 13 ', 13") held within the brush plate (8, 8', 8 ") ") arranged steam outlet.

2. A device for cleaning contaminated floor surfaces (6), in particular of traffic areas with at least one under a hood (2) arranged, mechanically acting on the surface to be cleaned, driven cleaning tool, as a cleaning tool a plurality of rotatable in a preferably star-shaped arrangement on a brush divider holder (7) connected brush plates (8, 8 ', 8 ") are provided, characterized in that the device (1) at least one hot steam supply with a within the hood between the brush plates (8, 8', 8") arranged Includes steam outlet.

3. Apparatus according to claim 2, characterized in that the superheated steam supply comprises at least one within one of a brush plate (8, 8 ', 8 ") held brush or bristles (13, 13', 13") arranged steam outlet opening.

4. Device according to one of claims 1 to 3, characterized in that the steam outlet opening for applying the voltage applied to the floor to be cleaned portions of the bristles (13, 13 ', 13 ") of the brush or the (8, 8', 8" ) is formed with emergent superheated steam.

5. Device according to one of claims 1 to 4, characterized characterized in that the brush divider holder (7) via a hollow shaft (10) is driven and via the channel formed by the hollow shaft (10), the steam is supplied.

6. Apparatus according to claim 5, characterized in that in the channel formed by the hollow shaft (10) a separate steam supply line is arranged.

7. Apparatus according to claim 5 or 6, characterized in that the hollow shaft (10) or arranged in the hollow shaft

Steam supply line is arranged in the direction of the floor to be cleaned extending extension (20).

8. The device according to claim 5 or 6, characterized in that the steam supply via a the brush divider holder associated steam supply line for supplying steam to the or a brush plate associated steam outlet openings takes place.

9. Apparatus according to claim 5 or 8, characterized in that the steam supply via a brush plate associated with the steam supply line for supplying steam to the or a brush associated steam outlet openings takes place.

10. Device according to one of claims 2 to 9, characterized in that within the hood, a first brush divider holder is arranged, are connected to the, preferably in a star-shaped arrangement further brush divider holder, in turn, each carrying one or more brush plates.

11. Device according to one of claims 1 to 10, characterized in that in the direction of movement of the device for cleaning a bottom surface of the hood (2) with the cleaning tools (8, 8 ', 8 ") a Vorwärmhaube (24) for applying the un ter the preheating hood (24) located bottom surface is arranged with heat.

12. The device according to claim 11, characterized in that the preheating hood (24) has one or more acted upon by the hot steam supply steam outlet openings.

13. The apparatus according to claim 12, characterized in that within the Vorwärmhaube (24) a plurality of meander exhibiting tube (25) is arranged, in which the steam outlet openings are introduced.

14. Device according to one of claims 11 to 13, characterized in that between the preheating hood (24) and the hood (2) with the cleaning tools (8, 8 ', 8 "), a suction device (26) for removing liquid and others arranged on the ground surface to be cleaned loose particles is arranged.

15. Device according to one of claims 1 to 14, characterized in that the brush plate (8, 8 ', 8 ") relative to the brush divider holder (7) is resiliently suspended.

16. The apparatus according to claim 15, characterized in that the suspension of the brush plates (8, 8 ', 8 ") on the brush divider holder (7) against the force of the resilient suspension allows a tilting movement.

17. The apparatus of claim 15 or 16, characterized in that on the brush plates (8, 8 ', 8 ") acting force of the resilient suspension is adjustable.

18. Device according to one of claims 11 to 17, characterized in that the brush plates (8, 8 ', 8 ") with respect to their rotatability by the drive (9, 10) of the brush divider holder (7) are decoupled.

19. A device for cleaning contaminated floor surfaces (6), in particular of traffic areas with under a hood (2) arranged, mechanically acting on the surface to be cleaned the, motor-driven cleaning tools, wherein as cleaning tools a plurality, in a preferably star-shaped arrangement rotatably connected to a brush divider holder (7) brush plates (8, 8 ', 8 ") are provided, characterized in that the brush plates (8, 8', 8 ") are decoupled with respect to their rotatability by the drive (9, 10) of the brush divider holder (7).