JP2024518870A - Supplying liquid to at least one area of the surface to be cleaned - Google Patents

Abstract

In the context of vacuum cleaning, a suction head 101 is provided, which comprises a housing 30, which is coupleable to an air suction source of a vacuum cleaner, and two brushes 20 arranged substantially parallel within the housing 30, each brush 20 being rotatable about an axis of rotation 21 and interacting with the surface 10 to be cleaned. The suction head 101 further comprises a wetting device 42, which allows a direct supply of liquid from at least one liquid supply position to at least one area of the surface 10 to be cleaned, the at least one liquid supply position being at the level of the area 24 between the brushes 20 and the axis of rotation 21 of the brushes 20 or at a level close to the surface level.

Description

The present invention relates to a suction head applied to a vacuum cleaner for performing a cleaning action on a surface, the suction head comprising a housing having a coupling area allowing coupling of the housing to an air suction source of the vacuum cleaner, and two brushes arranged substantially parallel within the housing, each brush being rotatable about an axis of rotation and interacting with the surface to be cleaned.

Furthermore, the present invention relates to a cordless vacuum cleaner including the above-mentioned suction head.

It is known that vacuum cleaners are intended to remove dirt from the surface to be cleaned. The term "dirt" as used in this text should be understood to cover any contaminant that may be present on the surface and that may be removable under the influence of the vacuum cleaning action (possibly in combination with another cleaning action such as mopping). In this respect, examples include dust and small particles of any kind, as well as wet types of contaminants such as spilled drinks. An example of a surface to be cleaned is a floor, which may be of any kind, such as a wooden floor, a carpeted floor, a tiled floor, etc.

Generally, a vacuum cleaner has a vacuum cleaner head or suction head. The head is the part of the vacuum cleaner where the actual process of picking up dirt from the surface to be cleaned takes place and is therefore placed on or at least close to the surface. Furthermore, the vacuum cleaner usually includes a body part including a dirt accumulation area and a device acting on the suction head so that suction is distributed in the suction head during the operation of the vacuum cleaner. The suction helps to facilitate the transport of dirt picked up from the surface during the operation of the vacuum cleaner to the dirt accumulation area, where the dirt passes through the outlet opening of the housing of the suction head. The suction may also have a function in the actual process of picking up dirt from the surface. On the other hand, the suction head may be equipped with at least one mobile component that interacts with the surface to pick up the dirt, such as at least one rotating brush that acts as a dirt agitator and in particular helps to detach the dirt from the surface and direct it towards the outlet opening.

International Patent Publication WO 2011/083373 A1 discloses a cleaning device for removing particles from a surface, comprising a spraying means for spraying droplets of a working liquid, a rotating brush having flexible brush elements, an inlet for receiving dirty air, such as particle-laden air, and a cleaning unit. The cleaning unit is suitable for separating at least a portion of the droplets of the working liquid from the air. During operation, the rotating brush is wetted with the working liquid. The brush is dimensioned and rotated at such a rotational speed that the droplets of the working liquid are discharged from the flexible brush element as a mist of droplets into a coalescence space of the device. The dirty air received at the inlet can be received in the coalescence space, and coalesced particles of the droplets discharged from the brush element form particles in the dirty air, which are transported from the coalescence space to the cleaning unit.

WO 2012/107876 A1 discloses a cleaning device comprising a head with an open side facing the surface to be cleaned and at least one brush rotatably arranged in the head, which contacts the surface to be cleaned. The at least one brush is provided with a plurality of bristles, which can be very soft and flexible. In such a case, the cleaning action of the surface is not performed by rubbing the surface, but by alternately bringing the bristles into and out of contact with the surface during the rotation of the brush. In particular, during one rotation of the brush, the bristles remove particles and/or liquid droplets from the soiled surface and, when they reach a position where they are not in contact with the surface and can be fully extended, they splash the particles and/or droplets. The head of the cleaning device, in which the brush is arranged, has means for receiving the particles and/or droplets and, optionally, transporting the particles and/or droplets to a collection space. The cleaning device is provided with means for realizing a suction force on the head in order to direct the particles and/or droplets in a desired direction when released from the bristles. Additionally, the cleaning device may supply cleaning fluid to the rotating brush to promote adhesion of particles to the bristles and/or provide additional cleaning benefits to the surface being cleaned.

International Patent Publication No. WO 2017/071727 A1 discloses a vacuum cleaner head including a housing having a vacuum extraction zone and first and second rollers positioned against a surface to be cleaned. Each of the first and second rollers picks up dirt from the surface as it rotates and moves over the surface during operation and carries the dirt to a vacuum extraction zone in the housing of the vacuum cleaner head. The vacuum extraction zone is defined between an outlet opening and the first and second rollers. When the vacuum cleaner head is used in a vacuum cleaner and the vacuum cleaner is operated, an air flow is generated through the vacuum extraction zone to the outlet opening. The vacuum cleaner head further includes a liquid dispenser for dispensing liquid onto the surface to be cleaned, and the vacuum cleaner head may further include a liquid dispenser for dispensing liquid onto at least one of the first and second rollers. Thus, the surface to be cleaned can be moistened to facilitate removal of detritus from the surface.

In general, the present invention aims to provide a means intended to achieve a good cleaning result of a vacuum cleaning action performed on a surface. Furthermore, the present invention aims to provide a means intended to prevent contamination of the suction head.

In view of the above, the present invention provides a suction head adapted for application in a vacuum cleaner to perform a cleaning action on a surface, the suction head comprising: a housing having a coupling area enabling coupling of the housing to an air suction source of the vacuum cleaner; two brushes arranged substantially parallel within the housing, each brush being rotatable about an axis of rotation and interacting with the surface to be cleaned; and a wetting device enabling direct supply of liquid from at least one liquid supply position to at least one area of the surface to be cleaned, the at least one liquid supply position being at the area between the brushes and at the level of the axis of rotation of the brushes or at a level close to the surface level.

From the above definition of the suction head according to the invention, it follows that the invention involves equipping the suction head with a wetting device that allows the direct supply of liquid from at least one liquid supply position to at least one area of the surface to be cleaned, the at least one liquid supply position being selected to be at the level of the area between the brushes and the rotation axis of the brush or at a level close to the surface level. In this way, it is achieved that the brush is indirectly wetted through contact with the surface and that the surface to be cleaned is wetted in a controlled manner without the need for a direct supply of liquid to the brush (although this is not excluded in the context of the invention). Since the suction head is usually moved back and forth by the user over the surface to be cleaned, the presence of a liquid supply source at a position between the brushes is effective enough to wet both brushes. By having at least one liquid supply position at the level of the rotation axis of the brush or at a level close to the surface level, the bottom side of the suction head can be effectively cleaned with clean liquid. It is practical if the direct supply of liquid to at least one area of the surface to be cleaned is accompanied by a continuous or intermittent flow of liquid or a spray of liquid directed from at least one liquid supply position of the suction head to the at least one area. The wetting device can be provided as an add-on to the existing design of the suction head, but it is also possible to provide the wetting device in a more integrated form. An example of a liquid is water or a mixture of water and a cleaning agent.

In the context of the present invention, it is possible that at least one liquid supply location is on the bottom surface portion of the suction head facing the surface at a distance of at least 2 mm and at most 6 mm from the surface to be cleaned. In this way, the cleaning effect of the bottom surface portion can be obtained by the liquid bridging the distance due to surface tension without the bottom surface portion being exposed to the dirt 11 shaken off by the brush 20. Keeping the bottom surface portion clean is one way of preventing contamination of the suction head and therefore also helps to optimize the cleaning result of the surface to be cleaned, since there is no contaminating effect of the clean surface portion of the suction head on the surface to be cleaned.

In a practical embodiment of the suction head according to the invention, the wetting device allows a direct supply of liquid from at least two liquid supply positions distributed on the suction head in the direction in which the rotation axis of the brush extends. The distribution of the liquid supply positions as described above is a factor in achieving a sufficient wetting of the brush without dry or nearly dry areas that would make the cleaning action less effective.

According to an advantageous option, the suction head comprises an elongated intermediate component that is in the area between the brushes and includes two parts that optionally cover part of the brushes. It is practical if the elongated intermediate component is suspended from a part of the housing of the supply head in its upper position. Covering as much of the brushes as possible (preferably in a very close range) is beneficial with regard to the efficient generation of suction forces in the suction head. The elongated intermediate component may be an integrated part of the housing or a separate component that is removably coupled to another component of the housing, for example to allow repairs or cleaning. On the one hand, the presence of an elongated intermediate component in the suction head negates the known option of one brush wetting the other brush during operation, but on the other hand, the elongated intermediate component has the function of facilitating the liquid supply and, moreover, preventing contamination of the internal surface of the suction head. In particular, it is possible that at least one liquid supply position is in the bottom surface part of the elongated intermediate component facing the surface to be cleaned. When the bottom surface portion of the elongated intermediate component is positioned so that it is close to the surface to be cleaned, i.e., when the bottom surface portion is positioned so that it faces the surface at a distance of at least 2 mm and at most 6 mm from the surface to be cleaned, as described above, the above-mentioned cleaning effect is achieved at the bottom surface portion.

It is practical if the wetting device includes a conduit system for transporting the liquid and discharging the liquid at at least one liquid supply location. If the suction head includes an elongated intermediate component as described above, the conduit system is adapted to include at least one conduit extending through the elongated intermediate component. In particular, if the wetting device allows direct supply of liquid from two or more liquid supply locations to two or more areas of the surface to be cleaned, it is advantageous if the conduit system includes at least one main conduit and at least one branch conduit coupled to the at least one main conduit and extending from the at least one main conduit towards the at least one liquid supply location. In this case, the main conduit may act as a kind of liquid buffer and/or distributor. It is beneficial to have a restricted liquid passage at the junction of the at least one main conduit and the at least one branch conduit in order to control the flow of liquid from the at least one main conduit to the at least one branch conduit. In one embodiment of the suction head in which the suction head includes an elongated intermediate component and the option of at least one conduit of the conduit system extending through the elongated intermediate component is combined with the option of the conduit system including at least one main conduit and at least one branch conduit, the at least one branch conduit is typically the at least one conduit extending through the elongated intermediate component.

In an advantageous embodiment, the suction head comprises a restrictive element in fluid communication with at least one main conduit and at least one branch conduit, the restrictive element being provided with at least one restrictive opening allowing liquid to pass in a direction from the at least one main conduit towards the at least one branch conduit. In this embodiment, the restrictive element or an assembly of components including the restrictive element is removably arranged in the suction head. This allows the restrictive element to be easily cleaned in order to avoid clogging of the at least one restrictive opening of the restrictive element.

The wetting device can be used for other purposes than supplying liquid to at least one area of the surface to be cleaned. For example, assuming that the suction head includes at least one wheel rotatably arranged on the suction head and adapted to contact the surface to be cleaned, the wetting device further allows for the direct supply of liquid to the at least one wheel. An important advantage of this option is that the cleaning of the at least one wheel is performed automatically, without requiring any action on the part of the user and without the need for external cleaning tools or tools for dismantling the components of the suction head. Thus, a very reliable way of keeping the at least one wheel of the suction head clean is provided, thereby avoiding situations in which the at least one wheel affects the cleaning result. In particular, the wetting device allows for the direct supply of liquid to the at least one wheel from the outside of the at least one wheel at the location of the tread of the at least one wheel. In this case, the at least one wheel can simply be of conventional design and made from one or more conventional materials, such as plastic or rubber, and the at least one wheel can be attached to the suction head in any suitable known manner. With regard to spreading the liquid over the tread of the wheel, the rotational movement of the wheel can be used advantageously. Additional measures aimed at keeping the at least one wheel clean include positioning the at least one wheel so that the rotating brush can interact with said wheel during operation of the suction head. A further advantage of this measure is that the part of the brush close to the wheel is to some extent wetted by the wheel. In any case, the at least one wheel is in the area between the brushes.

In the context of the present invention, a brush is any type suitable for use in picking up dirt from a surface to be cleaned. The brushes are selected to be identical or different. Each brush is specifically designed, for example, to act as an agitator or agitator of dirt particles present on the surface. In a practical embodiment of the suction head according to the invention, at least one of the brushes comprises a core element and flexible microfiber elements arranged on the core element. In such brushes, a linear mass density lower than 150 g per 10 km can be applied to the microfiber elements or at least their tip parts, so that the microfiber elements become very flexible. The above linear mass density can further be lower than 10 g per 10 km, 5 g per 10 km or 1 g per 10 km. Such microfiber elements are arranged on the core element in a dense arrangement so as to interact very effectively with the surface to be cleaned during operation of the suction head. Furthermore, it is practical if such microfiber elements are arranged on the core element in tufts.

It is practical if the operative shape of both brushes is generally cylindrical with a circular outer surface, i.e. if the operative shape of the brushes is generally roller-shaped (elongated roller).

The invention further relates to a vacuum cleaner, in particular a cordless vacuum cleaner, including a suction head as described above, equipped with a wetting device allowing a direct supply of liquid from at least one liquid supply position to at least one area of the surface to be cleaned. It is practical if such a vacuum cleaner includes a reservoir for receiving, storing and releasing liquid to the wetting device of the suction head. Advantageously, this reservoir is removably arranged on the vacuum cleaner, which makes it easy for the user to take the reservoir to a location where it is to be filled with liquid.

These and other aspects of the invention will become apparent from and will be described with reference to the following detailed description of a practical embodiment of a suction head comprising a housing and two brushes arranged within the housing, and further comprising a wetting device enabling the direct supply of liquid from at least one liquid supply location to at least one area of the surface to be cleaned.

The invention will now be described in more detail with reference to the figures, in which the same or similar parts are designated by the same reference numerals.

FIG. 1 shows components of a wet vacuum cleaner according to one embodiment of the invention and a portion of a floor having a surface to be cleaned. FIG. 2 shows a longitudinal cross-section of a suction head according to an embodiment of the invention taken at a position between two brushes included in the suction head. FIG. 3 shows an enlarged view of a detail of FIG. FIG. 4 shows a top perspective view of a portion of the suction head. FIG. 5 shows cross-sectional views of the suction head taken at different longitudinal positions of the suction head. FIG. 6 shows cross-sectional views of the suction head taken at different longitudinal positions of the suction head. FIG. 7 shows an enlarged view of a detail of FIG. FIG. 8 shows an optional assembly of the conduit system of the wetting device contained in the suction head.

Figure 1 shows the design of a wet vacuum cleaner 100 according to an embodiment of the present invention. The particular vacuum cleaner shown in Figure 1 and described below is only one example of the many types of vacuum cleaners that can be realized within the framework of the present invention. In this respect, it is noted that the present invention relates not only to wet vacuum cleaners, but also to other types of vacuum cleaners, such as wet/dry vacuum cleaners that have a dry cleaning function in addition to the wet cleaning function.

The wet vacuum cleaner 100 is used for the purpose of subjecting a surface 10, such as a floor surface, to a wet cleaning action. FIG. 1 shows the vacuum cleaner 100 in a normal operable position relative to the surface 10 to be cleaned. In this text, use of the term having a positional characteristic should be understood in relation to this normal operable position of the vacuum cleaner 100 relative to the surface 10 to be cleaned, which assumes that the surface 10 to be cleaned is in a bottom position and the vacuum cleaner 100 is placed on the surface 10.

On the side facing the surface 10 during operation of the vacuum cleaner 100, the vacuum cleaner 100 comprises a suction head 101 housing two brushes 20 which interact with the surface 10 during operation of the vacuum cleaner 100. In the following, it is assumed that each brush 20 is provided in the form of a roller rotatable about an axis of rotation 21 defined by the central longitudinal axis of the roller, and that each brush 20 comprises a core element 22 and a flexible microfiber element 23 arranged on the core element 22, this does not change the fact that other embodiments of the brushes 20 are also possible. The brushes 20 may be identical, but this is not necessary in the context of the present invention. As shown in FIG. 1 by the curved arrows depicted at the positions of the brushes 20, the brushes 20 are arranged so that they are rotatable in mutually opposite directions about their respective axes of rotation 21. The suction head 101 comprises a housing 30 which partially covers the brushes 20. The housing 30 is made, for example, of a plastic material.

Besides the suction head 101, the vacuum cleaner 100 includes a body portion 102 which is held by a user of the vacuum cleaner 100. Preferably, the suction head 101 and the body portion 102 are removably connectable to each other. The body portion 102 is shaped in any suitable manner. The profile of the body portion 102 shown in FIG. 1 is merely illustrative. It is useful if the body portion 102 includes a handle to enable a user to easily hold the body portion 102 and move the vacuum cleaner 100 over the surface 10 to be cleaned as desired.

To drive the brush 20 during operation of the vacuum cleaner 100, the vacuum cleaner 100 is provided with a suitable electric drive mechanism (not shown). To power the drive mechanism and possibly also other components of the vacuum cleaner 100, the vacuum cleaner 100 is connectable to a mains power supply and/or is provided with a suitable battery arrangement. Preferably, the vacuum cleaner 100 is a cordless device including a rechargeable battery arrangement, in which case it is more practical if the vacuum cleaner 100 is part of a set which includes a charging dock in addition to the vacuum cleaner 100. Such a set may also include a flushing tray which can be used to clean the brush 20. If the vacuum cleaner 100 is not provided with a battery, a simple dock without charging capabilities may be provided to receive and hold the vacuum cleaner 100 while it is not in operation.

The main body 102 of the vacuum cleaner 100 includes a liquid reservoir 40 for holding a liquid, such as water or a mixture of water and cleaning agent, and a liquid supply mechanism 41 for supplying liquid to the wetting device 42 of the suction head 101 during operation of the vacuum cleaner 100. The liquid supply mechanism 41 may, for example, include any suitable type of pump device or allow the displacement of liquid as required under the influence of gravity. In the illustrated embodiment, the wetting device 42 of the suction head 101 allows both a direct supply of liquid to the area of the surface 10 to be cleaned and to the two wheels 90 of the suction head 101 (see Figures 2, 3, 5 and 6). More details will be described below. Furthermore, in the illustrated embodiment, the suction head 101 includes an elongated intermediate component 25 in the area 24 between the brushes 20 and including two concave portions covering a part of the brushes 20, and the wetting device 42 includes a conduit system 43 partially arranged in the elongated intermediate component 25 and transporting the liquid and discharging the liquid to the area of the surface 10 and the two wheels 90. In FIG. 1, the liquid reservoir 40, the liquid supply mechanism 41, and the wetting device 42 of the suction head 101 are shown in dotted lines. It is practical if the liquid reservoir 40 is removably coupled to the body portion 102 so that the user can separate the liquid reservoir 40 from the body portion 102 when it is desired to take the liquid reservoir 40 to a location where it will be filled with liquid.

The body portion 102 of the vacuum cleaner 100 further includes a dirt reservoir 50 that receives and accumulates the wet dirt 11 picked up from the surface 10 by the brush 20 during operation of the vacuum cleaner 100. The dirt reservoir 50 is configured in various ways that are conventionally available for accumulating the wet dirt from the incoming dirt 11 picked up from the surface 10, such as a cyclone-type device or a tube-in-cup-type device. The body portion 102 includes a vacuum mechanism 60 that generates a negative pressure that functions to transport the dirt 11 from the area where the brush 20 is placed to the dirt reservoir 50 in the body portion 102 through an outlet opening 31 in the surface 32 of the housing 30 facing the brush 20 and a suction channel 51 that extends from the outlet opening 31 to the dirt reservoir 50. As can be seen from the partial view of the suction head 101 in FIG. 4, the housing 30 includes a coupling area 33 that allows coupling of the housing 30 to the suction channel 51, dirt reservoir 50, and vacuum mechanism 60 assembly of the body portion 102 of the vacuum cleaner 100. The outlet opening 31 is in fluid communication with this coupling area 33.

The basic features of the wet vacuum cleaner 100's mode of operation are as follows: In operation, the brush 20 is driven to rotate and the liquid supply mechanism 41 is activated to supply liquid to the wetting device 42 of the suction head 101, which releases the liquid onto the surface 10 to be cleaned and onto the two wheels 90. Stains on the area of the surface 10 within the reach of the brush 20 are separated under the influence of the liquid and the agitation caused by the brush 20, and dirt particles and dust on the area of the surface 10 are removed together with the liquid and transported to the dirt reservoir 50, passing on the way through the outlet openings 31 and the suction channels 51. The dirt 11 is picked up from the surface 10 by the tip portions of the microfiber elements 23 of the brush 20 and is shaken off from them as the brush 20 rotates in a position where the tip portions are no longer in contact with the surface 10.

As shown in FIG. 1, the vacuum cleaner 100 includes a user interface 70, which may include, for example, an on/off button 71. The vacuum cleaner 100 further includes a control system 80, which may include a microcontroller, which is programmed to move the brush 20 and activate both the liquid delivery mechanism 41 and the vacuum mechanism 60 in response to input received from a user via the user interface 70.

2 to 8 show aspects of the suction head 101 according to an embodiment of the present invention, in particular aspects of the wetting device 42 of the suction head 101. As can be seen in Fig. 2 and Fig. 4, the conduit system 43 of the wetting device 42 comprises two main conduits 44, 45, which are in different halves of the suction head 101 when viewed in the longitudinal direction/direction in which the rotation axis 21 of the brush 20 extends, and which can be coupled to a liquid supply mechanism 41. 2 , i) a branch conduit 46 coupled to a first one of the main conduits 44, 45, discharging liquid to one of the wheels 90 and extending from the first one of the main conduits 44, 45 to the wheel 90; ii) a branch conduit 47 coupled to the first one of the main conduits 44, 45 at a longitudinal position between the wheel 90 and the outlet opening 31, discharging liquid to a first region of the surface 10 to be cleaned and extending from the first one of the main conduits 44, 45 to the wheel 90; 0; iii) a branch conduit 48 coupled to the second of the main conduits 44, 45 at a longitudinal position between the other wheel 90 and the outlet opening 31, discharging liquid to a second region of the surface 10 to be cleaned and extending from the second of the main conduits 44, 45 to the surface 10; and iv) a branch conduit 49 coupled to the second of the main conduits 44, 45, discharging liquid to the other wheel 90 and extending from the second of the main conduits 44, 45 to the wheel 90.

The branched conduits 47, 48 which discharge the liquid onto the surface 10 to be cleaned extend partially through the elongated intermediate component 25, the liquid supply location from which the liquid is discharged onto the surface 10 being on the bottom side of the elongated intermediate component 25, i.e. on the bottom surface portion 26 of the elongated intermediate component 25 which faces the surface 10 to be cleaned. In this regard, it should be noted that in general, in the context of the present invention, the liquid supply location from which the liquid is discharged onto the surface 10 is at the level of the axis of rotation 21 of the brush 20 or closer to the surface level, i.e. at the level of the axis of rotation 21 of the brush 20 or at a lower level.

The discharge of liquid onto the surface 10 at liquid supply locations distributed along the brush 20 in the longitudinal direction l is a factor in achieving a sufficient wetting of the brush 20 without dry or nearly dry areas that would make the cleaning action less effective. Discharging liquid onto the wheel 90 during operation of the suction head 101 keeps the wheel 90 wet and clean, thus avoiding any adverse effects on the results of the cleaning action on the surface 10 that would result from the wheel 90 coming into contact with the surface 10. As can be seen from Figures 2 and 3, the location at which the liquid is discharged onto the wheel 90 is directly above the wheel so that the wheel 90 can receive the liquid at its tread 91.

Figure 5 shows another advantageous aspect of the design of the suction head 101 according to an embodiment of the invention, which is that each of the two wheels 90 contacts the brush 20, in particular the microfiber elements 23 of the brush 20. Firstly, this keeps the wheels 90 clean. Secondly, this wets the brushes 20 along their length, i.e. along their dimension in the longitudinal direction l.

Figure 6 shows an advantageous option in which at least one liquid supply location for discharging liquid onto the surface 10 to be cleaned is on the bottom surface portion of the suction head 101 facing the surface 10 at a distance of at least 2 mm and at most 6 mm from the surface 10. By ensuring that there is only a small space between the surface 10 and the bottom surface portion of the suction head 101, the bottom surface portion of the suction head 101 can be kept effectively clean. As mentioned above, it is practical if the bottom surface portion of the suction head 101 facing the surface 10 at a relatively small distance from the surface 10 constitutes the bottom surface portion 26 of the elongated intermediate component 25.

Based on the above, the advantages of a small space between the surface 10 to be cleaned and the bottom surface portion of the suction head 101 can be outlined.
- The liquid beneath the bottom surface portion fills the gap with the surface 10 and cleans the bottom surface portion by surface tension, trapping small dirt particles that adhere to the bottom surface portion.
The flow of clean liquid from the different positions where it is released provides a direct cleaning effect on the bottom surface portion, especially on the bottom side of the elongated intermediate component 25 .
- Due to the movement of the suction head 101, the area beneath the bottom surface portion always interacts with the brush 20.

Furthermore, it should be noted that when the surface 32 of the housing 30 facing the brush 20 is positioned to cover the brush 20 at a minimum distance, in addition to there being substantially no space for dirt to accumulate, suction is effectively generated within the suction head 101, resulting in a relatively high air velocity along the surface 32, which is also advantageous in keeping the surface 32 clean.

To promote an even distribution of liquid through each of the branch conduits 46, 47, 48, 49, it is practical if a restricted liquid passage 27 is present at the junction of the main conduit 44, 45 with each of the branch conduits 46, 47, 48, 49, as best seen in FIG. 7. In effect, the restricted liquid passage 27 serves to prevent drainage of the main conduit 44, 45 at the location of the first branch conduit 47, 48 when viewed in the downstream direction (which would prevent the supply of fluid to the other branch conduits 46, 49). The presence of the restricted liquid passage 27 thus provides a controlled withdrawal of liquid from the main conduits 44, 45 at the location where the branch conduits 46, 47, 48, 49 are joined to the main conduits 44, 45.

8 shows the option of applying the restrictive element 28 at the location where each branch conduit 46, 47 is joined to the main conduit 44, with the main conduit 44 being dimensioned to act as a buffer for the liquid 15. In this illustrated embodiment, the restrictive element 28 comprises a strip with two restrictive openings. The restrictive openings are dimensioned to achieve a restricted liquid passage 27 that creates a stream of droplets of the liquid 15 rather than a continuous flow. Preferably, the restrictive element 28 or the assembly of components in which the restrictive element 28 is included is removably arranged in the suction head 101, so that the user can occasionally remove the restrictive element 28 or the entire assembly for cleaning purposes. Regular cleaning of the restrictive element 28 and possibly also the adjacent components is particularly useful to avoid clogging of the restrictive openings, which would prevent the supply of the liquid 15 to the wheel 90 and the surface 10 to be cleaned.

Although both the options of directly supplying liquid 15 to at least one area of the surface 10 to be cleaned and directly supplying liquid 15 to at least one wheel 90 are illustrated and described in the context of a single embodiment of the suction head 101 according to the present invention, it should be understood that these options can be applied independently. Furthermore, it should be noted that in addition to or instead of the option of directly supplying liquid 15 to at least one wheel 90, the option of directly supplying liquid 15 to a position in the suction head 101 (e.g., a position on one or both brushes 20) is also feasible in the context of the present invention. Generally speaking, the wetting device 42 can be realized in any suitable manner. For example, the wetting device 42 can be designed with the ability to temporarily stop the supply of liquid to at least one wheel 90, if necessary. This can be useful considering situations in which the type of surface 10 to be cleaned requires more than an average amount of liquid, so that the user can sometimes manually start the cleaning action of at least one wheel 90.

When the suction head 101 includes an elongated intermediate element 25 that covers a portion of the brush 20 from the bottom side of the suction head 101, as is the case in the illustrated embodiment of the suction head 101, it is beneficial to use the elongated intermediate element 25 to accommodate at least a portion of one or more conduits of the conduit system 43 of the wetting device 42, but this is not essential in the context of the present invention.

It will be apparent to those skilled in the art that the scope of the present invention is not limited to the foregoing examples, and that certain amendments and modifications are possible without departing from the scope of the present invention as defined in the appended claims. It is intended that the present invention be construed as including all such amendments and modifications insofar as they come within the scope of the claims or their equivalents. While the present invention has been illustrated and described in detail in the drawings and description, such illustration and description should be considered as illustrative or exemplary only and not restrictive. The present invention is not limited to the disclosed embodiments. The drawings are schematic, and details not necessary for understanding the present invention may be omitted, and are not necessarily drawn to scale.

Variations of the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the figures, the disclosure, and the appended claims. In the claims, the word "comprises" does not exclude other steps or elements, and the word "a" or "an" does not exclude a plurality of elements. Any reference signs in the claims should not be construed as limiting the scope of the invention.

Elements and features described with respect to or in connection with a particular embodiment may be combined with elements and features of other embodiments as appropriate, unless expressly stated otherwise. Thus, the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

The terms "having" and "including" as used in this text will be understood by those skilled in the art to encompass the term "consisting of." Thus, the terms "having" or "including" may mean "consisting of" in the context of one embodiment, but may mean "containing/having/comprising at least the defined species and optionally one or more other species" in another embodiment.

An important aspect of the invention is as follows: In the context of vacuum cleaning, a suction head 101 is provided, comprising a housing 30 that can be coupled to an air suction source 60 of a vacuum cleaner 100, and two brushes 20 arranged substantially parallel in the housing 30, each brush 20 being rotatable about an axis of rotation 21 and of a type that interacts with the surface 10 to be cleaned. The suction head 101 further comprises a wetting device 42, which allows a direct supply of liquid 15 to at least one area of the surface 10 to be cleaned from at least one liquid supply position, the at least one liquid supply position being at the level of the area 24 between the brushes 20 and the axis of rotation 21 of the brushes 20 or close to the surface level.

Claims (15)

1. A suction head adapted for use in a vacuum cleaner to perform a cleaning action on a surface, comprising:
The suction head comprises a housing having a coupling area allowing coupling of the housing to an air suction source of the vacuum cleaner;
two brushes arranged substantially parallel within the housing, each brush rotatable about an axis of rotation and adapted to interact with the surface to be cleaned;
a wetting device that enables direct supply of liquid from at least one liquid supply position to at least one area of the surface to be cleaned, the at least one liquid supply position being in the area between the brushes and at the level of the rotation axis of the brush or at a level close to surface level. The suction head of claim 1, wherein the at least one liquid supply location is on a bottom surface portion of the suction head facing the surface to be cleaned at a distance of at least 2 mm and at most 6 mm from the surface. The suction head according to claim 1 or 2, wherein the wetting device enables direct supply of liquid from at least two liquid supply positions distributed on the suction head in the direction in which the rotation axis of the brush extends. A suction head according to any one of claims 1 to 3, comprising an elongated intermediate component including two parts in the region between the brushes and optionally covering a portion of the brushes. The suction head of claim 4, wherein the elongated intermediate component is suspended from a portion of the housing at a position above the elongated intermediate component. The suction head of claim 4 or 5, wherein the at least one liquid supply location is on a bottom surface portion of the elongated intermediate component facing the surface to be cleaned. The suction head according to any one of claims 1 to 6, wherein the wetting device includes a conduit system for transporting liquid and discharging liquid at the at least one liquid supply location. The suction head of claim 7, which is dependent on claim 6, wherein the conduit system includes at least one conduit extending through the elongated intermediate component. The suction head according to claim 7 or 8, wherein the conduit system includes at least one main conduit and at least one branch conduit coupled to the at least one main conduit and extending from the at least one main conduit towards the at least one liquid supply location. The suction head of claim 9, comprising a restrictive element in fluid communication with the at least one main conduit and the at least one branch conduit, the restrictive element being provided with a restrictive opening that allows liquid to pass in a direction from the at least one main conduit toward the at least one branch conduit, and the restrictive element or an assembly of components including the restrictive element being removably disposed within the suction head. A suction head according to any one of claims 1 to 10, comprising at least one wheel rotatably arranged on the suction head and adapted to contact the surface to be cleaned, the wetting device further enabling the direct supply of liquid to the at least one wheel. The suction head of claim 11, wherein the wetting device allows for direct supply of liquid to the at least one wheel at the location of the tread of the at least one wheel from the outside of the at least one wheel. The suction head according to claim 11 or 12, wherein the at least one wheel is arranged such that the rotating brush can interact with the at least one wheel during operation of the suction head. A suction head according to any one of claims 11 to 13, wherein the at least one wheel is in the area between the brushes. A cordless vacuum cleaner comprising a suction head according to any one of claims 1 to 14.

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