WO2011077273A1

WO2011077273A1 - Floor washing device

Info

Publication number: WO2011077273A1
Application number: PCT/IB2010/055174
Authority: WO
Inventors: Giada Vassanelli; Manuel Vassanelli
Original assignee: Giada Vassanelli; Manuel Vassanelli
Priority date: 2009-12-21
Filing date: 2010-11-15
Publication date: 2011-06-30
Also published as: ITVR20090220A1

Abstract

The present invention relates to a washing device (10) for washing a floor (P), comprising a frame (31); a brushing assembly (20) located at one end of the frame (31 ) and comprising one or more roller brushes (51, 51 a, 51 b); a power unit (41 ) equipped with transmission members (52, 53, 54) connected to the brushing assembly (20); means for dispensing a washing fluid (100), a cover element (92) of said brushing assembly (20) having a width substantially equal to the transversal extent of the brushing assembly (20); and a stabilizing wheel (64) mounted on an axis (68a) parallel to the floor and orthogonal to a direction of movement (A, B). The stabilizing wheel (64) is connected to said frame (31) through a damper element (63).

Description

FLOOR WASHING DEVICE

DESCRIPTION

The present invention relates to a specific electrical household appliance for washing and drying a floor. In particular, the present invention relates to a floor washing device, also called floor washer.

As is known, washing devices include roller brushes, a device for dispensing a detergent and a suction device. The roller brushes exert a mechanical scrubbing action on the floor, in which such cleaning action is assisted by a dispensing of the detergent on the floor. The suction circuit allows sucking the fluid after the cleaning, at the same time drying the floor.

However, it has been found that no washing devices are available which are capable of cleaning in corner areas of a floor and, at the same, time easy to maneuver.

Therefore, object of the present invention is to provide an innovative solution to the problems still unsolved by the known art, by providing a floor washing device as defined in independent claim 1.

Secondary features of the present invention are instead defined in the corresponding dependent claims.

The washing device according to the present invention entails several advantages.

For instance, the washing device according to the present invention entails the advantage of allowing washing in corner areas of a floor.

In particular, the washing device comprises a cover element of a brushing assembly shaped so as to have a width substantially equal to the transversal extent of the brushing assembly. The brushing assembly, which therefore is flush with the cover element at sides of the latter, can clean an area having a width corresponding to the width of the cover element. Therefore, it is possible to reach a corner area, e.g. by steering the brushing assembly along a wall defineing such corner area.

Preferably, the cover element has open sides, and the brushing assembly is exposed to view on said sides.

Moreover, the washing device has brushes arranged at one end of the frame, and this arrangement allows a high maneuverability of the device, as a user can easily steer and control the direction of movement of the washing device by driving the frame by means of a handle that is located, e.g., at an opposite end with respect to the brushing assembly.

In fact, as will be seen from the appended figures of the embodiment example described below, the brushing assembly is located substantially in a zone corresponding to a zone of axial extent of the frame, and therefore it is easily maneuverable and steerable by action on the frame itself.

Moreover, thanks to the fact that the brushing assembly is located at the end of the frame, an entailed advantage is that the weight of the frame rests at least partially on the brushing assembly; therefore, the weight force of the frame can contribute to increase the scrubbing force exerted by the brushing assembly.

At the same time, the device according to the present invention includes a stabilizing wheel connected to the frame by means of a damper element.

Such stabilizing wheel, which, as can be seen from the figures, is preferably arranged outside the brushing assembly, and, with respect to a direction of forward movement, is located behind the brushing assembly (therefore, between the brushing assembly and a user maneuvering the washing device) acts, together with the damper element, as a load bearing unit for the washing device, both in a resting position and in use. Basically, the weight of the entire device is distributed between the stabilizing wheel and the brushing assembly.

For instance, in an embodiment, the stabilizing wheel, together with the damper element, the frame and the brushing assembly, defines a structure that observed from a side has a triangular profile, in which the base of the triangle is defineed by the brushing assembly and the stabilizing wheel.

This embodiment entails the advantage that it is possible to place the washing device in a standing position, by resting it on the stabilizing wheel and on the brushing assembly, without having to rest it on a wall or any other support. In other words, when the washing device is not in use, the frame and the power unit are resting on the brushing assembly and the stabilizing wheel.

Moreover, the damper element has the function of allowing moving in a vertical direction (with a sort of bounce) the frame during use, e.g. when it is necessary to lower the frame in order to clean-beneath-a-pieee of furniture, or push the device toward an area difficult to reach. Basically, the damper element allows to angularly move the frame with respect to the floor.

Preferably, in order to obtain such angular motion or bounce, the damper element comprises a cylindrical body and a rod, arranged in a mutual telescopic relationship, and cooperating with a spring. In other words, by raising or lowering the washing device with respect to the floor, the rod of the damper element moves axially with respect to the cylindrical body, in a manner damped by means of the spring.

In an embodiment, the washing device comprises a preload unit, or adjustment unit, which acts on the compression of the spring and allows to obtain a variation of the overall length of the damper element, i.e. a variation of the maximum travel of axial displacement of the rod with respect to the cylindrical body.

Such variation of overall length of the damper element allows to delocalize the center of gravity of the entire washing device and distribute, according to needs, the weight of the entire washing device between the brushing assembly and the stabilizing wheel, so as to be able to vary the operating or scrubbing force exerted by the brushing assembly.

In fact, the greater the weight supported by the brushing assembly, the greater the operating force of the brushing assembly (in this case, in fact, the brush can exert a greater scrubbing force on the floor); alternatively, by delocalizing the weight of the entire washing device on the stabilizing wheel, it is possible to decrease the scrubbing force on the floor and lighten a user's effort during use of the washing device.

Other advantages, features and operation steps of the subject-matter of the present disclosure will be made evident in the following detailed description of preferred embodiments thereof, given by way of example and not for limitative purposes.

However, it is evident how each embodiment may entail one or more of the advantages listed above; in any case, it is however not required for each embodiment to concomitantly entail all of the advantages listed.

It is also to be understood that all possible combinations of the afore-indicated embodiments, and of those described with reference to the following detailed description, fall within the scope of the present disclosure.

Reference will be made to the figures of the appended drawings, wherein:

Figure 1 is an overall perspective view of a washing device according to the present invention;

Figure 2A is a side sectional view of a device according to the present invention; Figure 2B is a schematized side view of the structure of a device according to the present invention;

Figure 3 is a view of a frame and some parts related to a power unit and a brushing assembly of a device according to the present invention;

Figures 4, 5A and 5B show a brushing assembly and a power unit of a device according to the present invention;

Figure 6 is a partial view of a device according to the invention, showing a stabilizing wheel;

Figure 6A is a bottom perspective view of the stabilizing wheel of Figure 6;

Figure 6B is another perspective view of an assembly for supporting a stabilizing wheel of Figure 6A, in which the stabilizing wheel has been removed;

Figure 6C is a side view of the stabilizing wheel of Figure 6 and 6A;

Figure 6D is a sectional view along line VI-VI of Figure 6C;

Figures 7A-7B are side views of a damper element of a device according to the present invention;

Figure 7C is a sectional view along line VII-VII of Figure 7B;

Figure 7D is a view of a detail P in enlarged scale of Figure 7C;

Figures 8A to 8C are views illustrating three different working positions assumed by a washing device according to the present invention;

Figures 9A to 9C are views of a cover element of a brushing assembly of a washing device according to the present invention;

Figure 10 is a view of a suction assembly of a washing device according to the present invention;

Figure 11 is a view of a suction assembly of a device according to the present invention, provided with a brushing assembly and a stabilizing wheel;

Figure 12 is a perspective view from a front zone of a suction assembly of a device according to the present invention;

Figure 13 is a perspective and schematic view of an assembly for dispensing a washing fluid;

Figure 1 is a view of a control device for the assembly for dispensing a washing fluid of Figure 13;

Figure 15 is a schematized side view of the structure of a washing device according to the present invention in accordance to a variant embodiment.

Referring to Figure 1 , a washing device according to the present invention is denoted by reference number 10.

The washing device 10 is arranged in a standing position, substantially vertical on a floor P. With respect to such standing position a direction of movement is defined, in particular a forward one, denoted by reference letter A in Figure 1 , and a rearward one, denoted by reference letter B.

Hereinafter in the description and in the following claims, any mention to such direction of forward movement A or of rearward movement B, and in general any spatial reference, like, e.g., top or bottom, is to be understood, as specified above, with reference to the position of the washing device 10 shown in figure 1 resting on the floor P.

The washing device 10 comprises a frame 31 , a brushing assembly 20 locatedat one of the two ends of the frame 31 , i.e., as can be seen in the figures, substantially in a zone corresponding to a zone of downward axial extent of the frame 31 , a power unit 41 and cover element 92, also referred to as carter 92, which covers the brushing assembly 20.

At the opposite end of the frame 31 , i.e. toward the top, there is a handle 21.

Basically, in this preferred embodiment of the invention, the frame 31 is an elongated body including, at a top thereof, a handle 21 provided with an on/off actuating button 24 and connected, at the other end thereof, in correspondence of a bottom zone, to a brushing assembly 20.

As can be seen in the drawings, the power unit 41 is interposed between the frame 31 and the brushing assembly 20.

The washing device 10 also comprises a dispensing unit 100 for dispensing a detergent fluid or washing fluid, and a suction assembly 110. The unit 100 for dispensing the detergent fluid allows to dispense the detergent fluid from a storage tank 101.

As shown in Figures 3, 4, 5A and 5B, the brushing assembly 20 comprises one or more roller brushes 51 , capable of rotating about a shaft 22 arranged along an rotation axis 22a parallel to the floor P and substantially orthogonal to the direction of movement A, B during the cleaning of the floor P.

In the preferred embodiment of the invention, the brushing assembly 20 is comprised of three coaxial brushes 51 , 51a, 51b. The three brushes 51 , 51a, 51b are made of cylindrical elements provided with bristles on their respective external mantel.

Said brushes 51 , 51a, 51 b rotate about the axis 22a. The central brush 51 is substantially aligned to and underlying the power unit 41. The other two brushes 51a, 51 b project laterally in a cantilevered manner from the central brush 51 , being lateral protrusions of the central brush 51.

More specifically, as can be seen in Figures 3, 4, 5A and 5B, the power unit 41 which is fastened to said frame 31 is arranged topwise with respect to the brushing assembly 20, and more specifically to the central brush 51.

It follows that, in the embodiment example, the power unit 41 rests on the brushing assembly 20, and more specifically on the central brush 51.

As depicted in Figures 3, 4, 5A, 5B and 6, the power unit 41 is equipped with transmission members connected to the brushing assembly 20, which serve to rotate the brushes 51 about the rotation axis 22a.

More specifically, an electric motor 42 is housed in a cylindrical casing 42a equipped with finnings 42b acting as air intakes (Figures 5A-5B).

Two brackets 43 are connected to the sides of the electric motor 42 and are equipped with feet 62 (Figure 4) such as to allow, in case of non-use, to be able to raise the brushes 51 , 51a, 51b with respect to the floor P supporting the weight of the washing device 10, further preventing a forward upturning of the washing device 10.

As can be seen in Figures 3, 4, 5A e 5B the electric motor 42, having a substantially cylindrical shape, transmits motion through a shaft 61 to which a belt mechanism 52 is connected. The belt mechanism 52 sets in rotation a pulley 53 which transfers motion from the electric motor 42 to the brushing assembly 20.

Moreover, a belt tightening device 54 is arranged at a bottom portion of the electric motor 42, on a side facing the belt 52.

In the preferred embodiment of the invention, the shaft 22 of the brushes 51 ,

51a, 51b, which is mounted on bearings not shown in the drawings, is rotated by the pulley 53 connected thereto, and is free to rotate with respect to said brackets 43 (Figures 5A and 5B).

The driving belt 52 is preferably positioned between one of the two lateral brushes 51a and the central brush 51 (Figure 5B). Moreover, it can be seen that the brackets 43 are fitted in corresponding slits made in the cover element 92.

The cover element 92, shown in detail in Figures 9A, 9B and 9C, covers the brushing assembly 20, and is shaped so as to shield the brushes 51 , 51a, 51 b along the direction of movement A, B. The cover element 92 has a width substantially equal to the transversal extent of the brushing assembly, so as to be flush with the cover element 92 at sides of the latter.

In the example illustrated, the cover element 92 has open sides, and the brushing assembly 20 is exposed to view on said sides.

Even more specifically, in the preferred embodiment of the invention, said cover element 92 is a carter 92 substantially half-cylinder-shaped, cut by a plane passing by the axis of the cylinder itself, covering the brushes 51 , 51a, 51 b. The carter 92, besides having the function of covering the brushes 51 , allows to obtain a connection between a stabilizing wheel 64 and the frame 31 , as described below.

In particular, the stabilizing wheel 64 is located, with respect to a direction of forward movement A, in a rear zone with respect to the brushing assembly 20 and to the frame 31 , therefore outside the carter 92, between the brushing assembly 20 and a user utilizing the washing device 20.

Such stabilizing wheel 64 acts as bearing of the washing device 10, both in use in a washing step and in a rest step, for instance a short-timed rest step between one cleaning and the other one, and at the same time serves to distribute the weight force of the entire washing device, without having the weight resting entirely on the brush 51 , 51a, 51b during a use of the washing device 10. As can be observed from Figures 2a and 2b, the stabilizing wheel 64 substantially defines with the brushing assembly and the frame 31 a structure that, observed from a side, has a triangular profile, denoted by T1 in Figure 2b. In other words, the stabilizing wheel 64, the brushing assembly and the frame 31 are joined by means of a triangle-shaped ideal line T1.

Referring to Figures 6 and 6A-6D, the stabilizing wheel 64 is mounted on a shaft 68 arranged on an axis 68a parallel to the floor P and orthogonal to the direction of movement A, B.

More specifically, referring to Figures 6A and 6D, said stabilizing wheel 64 is internally hollow and cooperates with two friction discs 66, or friction bushings, arranged coaxial to the shaft 68 in an internal zone 64a of the stabilizing wheel 64, and pushed toward each other by springs 67.

Between the friction discs 66 and the stabilizing wheel 64, a one-way bearing 65 is interposed (in the radial direction). The one-way bearing 65 is braked in a direction (corresponding to the direction of forward movement A of the entire washing device 10) by the above-mentioned friction discs or bushings 66, whereas it is free to rotate in the opposite direction (backward direction B). Thus, the friction discs 66 can determine a motion braking action in the direction of forward movement A, leaving the stabilizing wheel 64 free to rotate in the direction B opposite to that of forward movement A.

It follows that the motion of the entire washing device 10 is at least partially braked when the latter moves forward. Said braking action is advantageous as it allows to reduce a dragging force exerted by the brushes 51 , 51a, 51 b, which by being in rotation exert a high traction of the washing device 10 forward in the direction of movement A.

In other words, the braking action exerted on the stabilizing wheel 64 is such as to at least partially compensate for dragging due to rotation of the brushes 51 , 51a, 51 b.

At the same time, the washing device 10 can be moved in the opposite direction B without hindrance by the stabilizing wheel 64, so as to lighten any effort by the user.

In order to keep said stabilizing wheel 64 at a specific distance from the axis 22a of the brushes 51 , 51a, 51b, the washing device 10 includes a spacer casing 63c interposed between the stabilizing wheel 64 and the carter 92.

As can be seen in Figure 6 and in Figures 6A-6D, said stabilizing wheel 64 is connected to the frame 11 by a damper element 63, which allows to obtain a damped lowering/raising motion of the whole of the frame 31 with respect to the floor P, according to a vertical path or direction. Possible working positions of the washing device 10 are illustrated in Figures 8A-8C.

In particular, the stabilizing wheel 64 is connected to the damper element 63 by a bridge-shaped body 63a, which is fastened to opposite ends of the shaft 68 of the stabilizing wheel 64. In the bridge-shaped body 63a, a hole 63b is made in which one end of the damper element 63 is fitted and fastened.

Such connection may be made by other fastenings, for instance male/female fastenings.

Even more particularly, referring to Figures 7A-7D, it is observed that the damper element 63 is an elongated or shaft-like unit, which comprises at least two bodies, in particular a rod 73 and a cylindrical body 74 disposed in telescopic relationship. A compression spring 72, which cooperates with the rod 73, is housed in the cylindrical body 74. Basically, in a preferred embodiment of the invention, the damper element 63 is a body of variable length.

The variability of length of the damper element 63, in the example obtained by means of the above-mentioned telescopic structure, allows to raise or lower the frame 31 with respect to the floor P during the. cleaning. Such maneuverability is fostered by the presence of a slotted hole 63d made in the spacer casing 63c, which houses with a wide clearance a bottom end of the rod 73. In other words, the damper element 63 allows to utilize the washing device 10 with any tilt angle with respect to the floor, thanks to an automatic adjustment guaranteed by the cylindrical body 74 and the body 73 in telescopic relationship, and the spring 72.

The washing device 10 further comprises a preload or adjustment mechanism 71 , which allows to adjust the load of the spring 72, and therefore the maximum lengthening/shortening travel of the damper element 63.

More particularly, the preload mechanism 71 comprises a knob 71a having a threaded portion 71 d which is fitted in a sleeve 71b. The sleeve 71 b is coaxially located outside the cylindrical body 74, and between them a relative movement in the axial direction is allowed. In particular, guides 71 e are interposed between the sleeve 71 b and the cylindrical body 74 in order to allow a relative movement between the sleeve 71 b and the cylindrical body 74.

Moreover, it can be observed that the threaded portion 71 d is in pressing contact with the spring 72. In other words, the spring 73 is interposed inside the cylindrical body 74 between the rod 73 and the threaded portion 71 d of the knob 71a.

Furthermore, the sleeve 71 b is fastened to the frame 31 by means of a flange

71c, which is stably screwed into the cylindrical body 74.

The screwing of the threaded portion 71 d of the knob 71a into the sleeve 71 b and into the cylindrical body 74 causes an upward withdrawal of the cylindrical body 74 and an increase in the compression of the spring 72, as well as a variation of the pressure exerted by the spring 72 on the rod 73.

Thus, by acting on the preload mechanism 71 , it is possible to increase or decrease the overall length of the entire damper element 63 and therefore, by effect of the set of constraints of the entire washing device 10 described above, to delocalize the center of gravity of the entire washing device 10 forward or backward, to or from the brushes 51 , 51a, 51b. Thus, it is possible to vary the weight force acting on the rotary brushes 51 , 51a, 51 b in order to obtain an adequate cleaning on various typologies of rough or smooth surfaces.

In fact, by unscrewing the knob 71a and decreasing the compression of the spring 72, an overall length of the damper element 63 and a forward delocalizing of the center of gravity of the washing device 10 are obtained, such that the weight force on the brushes 51 , 51a, 51b is increased. Therefore, a greater scrubbing action can be exerted on the floor P.

On the contrary, by screwing the knob 71a and increasing the compression of the spring 52, the overall length of the damper element 63 is reduced, therefore the center of gravity is delocalized backward and the weight force on the rotating brushes 51 is reduced. The washing device 10 in this case will be lighter to maneuver for a user, by means of the handle 21.

It has to be observed that, in the example illustrated, the damper element 63 is arranged outside the frame 31. However, a variant embodiment may be provided in which, unlike the afore-described variant embodiment the damper element 63 is housed in a casing of the frame 31 , so as to define a single body with the frame 31. This solution, which is schematized in Figure 15, causes no modification to the operation of the washing device 10 described above, and maintains all of the features and advantages obtained by the afore-described embodiment.

In particular, in accordance with such variant, it can be recognized that the washing device 10 has a triangular profile, denoted by T2 in Figure 15. In particular, the triangle is defineed by a closed line, ideally connecting an end portion of the frame 31 , the stabilizing wheel 64 and the brushing assembly 20.

Referring to Figures 13 and 14, it is described a dispensing unit 100 for dispensing the above-mentioned detergent fluid.

The dispensing unit 100 for dispensing a detergent fluid comprises the abovementioned tank 101 for the detergent and a duct 104, coming out of the tank 101 toward the brushes 51 , 51a, 51b and having, near the brushes 51 , 51a, 51 b, a branch 105. Downstream of said branch 105, following a detergent outlet direction, the dispensing unit 100 for dispensing the detergent fluid comprises first diffusing nozzles 106 and second diffusing nozzles 107 for diffusing detergent fluid, which are arranged near the brushes 51 , 51a, 51b.

In particular, with respect to the direction of forward movement A, the first diffusing nozzles 106 are arranged behind the brushes 51 , whereas the second diffusing nozzles 107 are arranged in front of the brushes 51 , 51a, 51 b.

In order to forward the detergent liquid into the first diffusing nozzles 106 and the second diffusing nozzles 107, the washing device 10 includes a feeler 102, which is a sensor arranged at the foot of the washing device 10, near the floor P, and is adapted to contact the floor P while in motion. The feeler 102 is housed in a casing 103, which contains a control unit 108.

In particular, the control unit 108 is configured to control a pair of electrovalves 109a, 109b, set each between the branch 105 and the respective first diffusing nozzles 106, and the second diffusing nozzles 107.

In operation of the washing device 10, the feeler 102 detects the direction of forward (A) or backward (B) movement of the washing device 10. On the basis of the detection of direction by the feeler 102, the control unit 108 opens/closes the respective electrovalve 109a, 109b and allows to open/close the transit of fluid only in the first diffusing nozzles 106 or in the second diffusing nozzles 107.

In other terms, the feeler 102 outputs a suitable electric signal, which, under control by the control unit 108, opens/closes respective electrovalves 109a, 109b associated to the first diffusing nozzles 106 and the second diffusing nozzles 107. Thus, detergent is sprayed only in the diffusing nozzles 106/107 which each time are located in front of the brushing assembly 20.

This step allows to prevent the dispensing of detergent in an area which is not covered by the brushes 51 , 51a, 51b.

Referring to Figures 10, 11 and 12, the above-mentioned suction assembly 110 is described.

The suction assembly 110 comprises an electric motor 161 for sucking the detergent and any dust collected, so as to carry out an at least partial drying of the floor P immediately after washing. The suction assembly 110 further comprises a suction mouth (not shown in the figures) ending with one or more blades 124 made of rubber material, which, during use, are located in direct contact with the floor P. The suction assembly 110 further comprises a suction duct 122, having an end connected to said suction mouth and an opposite end ending into a recovery tank 121 for sucked fluid. A filter element 151 is interposed between said recovery tank 121 and an air inlet of said electric motor 161 , and allows a suitable filtering upstream of the electric motor 161. In the preferred embodiment of the invention, shown in Figures 10 and 11 , said blades 124 are housed directly in the carter 92 and connected, through a conveyor 123, to a suction hose 122. Said hose 122 is connected with an air-liquid separation unit 152 which is located at a median zone of the frame 31. Such unit 152 comprises the above-mentioned filter element 151 , and deflectors adapted to separate air from the sucked fluids and the recovery tank 121. Suction is obtained from an actuation of the electric motor 161 mounted on a fulcrumed support 162 on the frame 31. By rotation of a handle with an eccentric pin, it is possible to facilitate the removal of the recovery tank 121 in order to allow the emptying, the cleaning and the subsequent assembling thereof.

The present invention has been hereto described with reference to a preferred embodiment thereof. It is understood that other embodiments might exist, all falling within the concept of the same invention, and all comprised within the protective scope of the claims hereinafter.

Claims

1. A washing device (10) for washing a floor (P), comprising:

- a frame (31 );

- a brushing assembly (20) located at one end of said frame (31), comprising one or more roller brushes (51 , 51 a, 51 b), rotatably mounted on respective rotation axes (22, 22a), said brushes (51 , 51 a, 51 b) being arranged with said rotation axes (22, 22a) parallel to the floor (P) and substantially orthogonal to a direction of movement (A, B);

- a power unit (41 ) equipped with transmission members (52, 53, 54) connected to said brushing assembly (20) to rotate said brushes (51) about the respective rotation axes (22, 22a);

means for dispensing a washing fluid (100),

a cover element (92) of said brushing assembly (20), said cover element (92) being shaped so as to shield said brushes (51) along the direction of movement (A, B) and have a width substantially equal to the transversal extent of the brushing assembly (20);

- a stabilizing wheel (64) mounted on an axis (68a) parallel to the floor and orthogonal to the direction of movement (A, B); wherein said stabilizing wheel (64) is connected to said frame (31) through a damper element (63).

2. The washing device (10) according to claim 1 , wherein said frame (31 ), said damper element (63), said stabilizing wheel (64) and said brushing assembly (20) define a structure having triangular profile (T1).

3. The washing device (10) according to claim 1 , wherein at least one portion of said frame (31), said stabilizing wheel (64) and said brushing assembly (20) define a structure having triangular profile (T2).

4. The washing device (10) according to any one of the preceding claims, wherein, with respect to the direction of movement (A, B), said stabilizing wheel (64) is located in a region rearward of said brushing assembly (20).

5. The washing device (10) according to any one of the preceding claims, wherein said power unit (41) is interposed between said frame (31) and said brushing assembly (20).

6. The washing device (10) according to any one of the preceding claims, wherein said brushing assembly (20) comprises three coaxial brushes (51 , 51 a, 51 b), wherein a central brush (51 ) is aligned to said power unit (41 ) and two lateral brushes (51a, 51 ) project laterally in a cantilevered manner with respect to said central brush (51 ).

7. The washing device (10) according to any one of the preceding claims, wherein said stabilizing wheel (64) is mounted on a bearing (65) rotatable in a braked manner in a direction corresponding to a direction (A) of forward movement of the washing device (10), and free to rotate in a direction (B) opposite to said direction (A) of forward movement.

8. The washing device (10) according to any one of the preceding claims, wherein said damper element (63) is an extensible body, wherein a variation of length of said damper element (63) corresponds to a derealization of the center of gravity of the washing device (10).

9. The washing device (10) according to any one of the preceding claims, wherein said damper element (63) comprises at least one cylindrical body (74) and one rod-shaped body (73) housed in telescopic relationship in the cylindrical body (74), in said cylindrical body 74 being housed a spring (72) cooperating with the rod (73).

10. The washing device (10) according to claim 9, comprising an adjustment mechanism (71) adapted to adjust an overall length of the damper element (63).

11. The washing device (10) according to claim 10, wherein said adjustment mechanism (71) includes a knob (71a) having a threaded portion (71 d) which is screwed into the cylindrical body (74) of the damper element (63) and fitted in a sleeve (71b) fastened to said frame (31), said sleeve (71b) coaxially surrounding said cylindrical body (74) and being axially movable with respect to said cylindrical body (74), wherein said threaded portion (71 d) is in pressing contact with the spring (72).

12. The washing device (10) according to any one of the preceding claims, wherein said stabilizing wheel (64) rotates about a shaft (68) arranged along an axis (68a) and wherein said washing device (10) comprises a bridge-shaped body (63a) which is fastened to opposite ends of said shaft (68) of the stabilizing wheel (64), wherein one end of the damper element (63) is fastened to said bridge-shaped body (63a).

13. The washing device (10) according to any one of the preceding claims, comprising a spacer casing (63c) interposed between the stabilizing wheel (64) and the brushing assembly (20), wherein said spacer casing (63c) keeps such stabilizing wheel (64) at a specific distance from the brushing assembly (20).

14. The washing device (10) according to claim 13, wherein said spacer casing (63c) includes a slotted hole (63d) in which is fitted, passing with clearance, said damper element (63).

15. The washing device (10) according to any one of the preceding claims, comprising suction means (123, 121 , 122, 124, 161) which comprises a suction duct (122), having an end connected to a suction mouth and an opposite end ending into a recovery tank (121) for sucked fluid.

16. The washing device (10) according to any one of the preceding claims, comprising a recovery tank (121) and a handle provided with an eccentric pin for opening and closing a suction circuit, wherein an actuation of said handle allows a removal of the recovery tank (121).

17. The washing device (10) according to any one of the preceding claims, wherein said means for dispensing a washing fluid (100) includes a duct (104), first diffusing nozzles (106), second diffusing nozzles (107) and a branch (105) interposed between the duct (74) and said first diffusing nozzles (106) and second diffusing nozzles (107), wherein, with respect to a direction of forward movement (A), the first diffusing nozzles (106) are arranged behind the brushing assembly (20) and the second diffusing nozzles (107) are arranged in front of the brushing assembly (20).

18. The washing device (10) according to claim 17, wherein said means for dispensing a washing fluid (100) includes a feeler (102) adapted to contact the floor (P) and detect the direction of movement (A, B) and a control unit (108) electrically connected to said feeler (102), and adapted to open/close respective electrovalves (109a, 109b) associated to said first diffusing nozzles (106) and second diffusing nozzles (107) on the basis of said direction of movement (A, B) detected by said feeler (102).