EP3440973B1 - Vacuum cleaner and floor nozzle for vacuum cleaner - Google Patents

Description

The invention relates to a floor nozzle for a vacuum cleaner for cleaning and care of floor surfaces, wherein the floor nozzle has at least one elongate, extending transversely to the machining direction agitator, which is rotatably driven via a drive unit to the floor nozzle, wherein the drive unit comprises a rotating on a rotation axis driver for transmitting a torque to the Agitatorwalze, wherein the driver has a shaft, wherein the shaft is arranged coaxially to the axis of rotation and at one end forms a loose shaft tip. Moreover, the invention relates to a vacuum cleaner with such a floor nozzle.

In the private household as well as in the industry, vacuum cleaners are used to clean surfaces such as textile floor coverings and smooth floors. In this case, a floor nozzle of the vacuum cleaner is continuously pushed back and forth on a floor surface for dust absorption. The noise emission of the vacuum cleaner depends strongly on the design of the floor nozzle. As part of the reduction of noise emissions in vacuum cleaners, the design of the floor nozzle plays an increasingly important role. Furthermore, the dimensioning of vacuum cleaner fans this follows a trend towards less power, which leads first to lower, available at the floor nozzle, volume flows, so that due to the continuity relationship at the bottom nozzles usually lower flow rates. In order nevertheless to absorb sufficient dust, the bottom nozzles are equipped with agitator rollers, such as brush rollers, which actively work on the bottom surface and thus detach adhering dirt particles from the bottom surface, in particular from carpet fibers. A problem with these agitators is that there is some degree of backlash between the agitator roller and the drive unit, especially when the agitator roller is removable from the floor nozzle for maintenance purposes. The play between Agitatorwalze and drive unit means that upon rotation of the Agitatorwalze, driven by the drive unit, the Agitatorwalze vibrates and thereby generates noise.

From the WO 2014/195670 A1 a floor care device is known, wherein the floor nozzle has an elongated, extending transversely to the machining direction Agitatorwalze, wherein the Agitatorwalze is rotatably mounted relative to the floor nozzle. The drive unit provided here for driving the agitator roller is arranged laterally on the agitator roller.

In order to be able to remove such an agitator roller more easily from a floor nozzle and in order to reduce the noise and vibrations arising during the drive of the agitator roller, is in the EP 2 882 328 B1 proposed to equip the drive unit with a rotating driver for transmitting torque to the Agitatorwalze. A disadvantage of the driver described here is that the production of the tapered head requires relatively much material and the production of such a part in the plastic injection molding due to the large volume of the tapered head is prone to error, which also leads to larger tolerances. In addition, the centering and tightening of the tapered head on the one hand and the positive connection by the thread running around the shaft on the other hand to movements of the components, which continue to generate considerable noise and vibration, especially if the components have large tolerances.

The invention thus presents the problem of providing an improved floor nozzle and an improved vacuum cleaner.

According to the invention this problem is solved by a floor nozzle with the features of claim 1 and a vacuum cleaner according to claim 10. Characterized in that the shaft extends at least one thread of a along the axis of rotation tapered to the stem tip thread, wherein the drive unit has a rotating on the axis of rotation cam receiver having a corresponding with the shank and the tapered to the stem tip thread of the driver bore, For example, a floor nozzle with a drive unit can be specified that reduces noise and vibration and can be easily and inexpensively manufactured. In addition, the Agitatorwalze can be easily removed from the floor nozzle by simply unscrewing the driver and the Mitnehmeraufnahme. Preferably, the shaft is cylindrical. The conical tapering to the shaft tip thread takes next to the positive connection between the driver and the driver receiving the centering of the two components to each other. The proposed drive unit is not susceptible to noise emissions when driving the Agitatorwalze especially for larger tolerances between driver and driver pickup. The conical tapering of the stem tip causes a tolerance compensation between the driver and the driver holder, so that these components can be manufactured with greater tolerance, without this leading to vibrations of the floor nozzle and the agitator roller when the agitator roller is driven. With these larger tolerances, the components of the drive unit can be produced cheaper and easier to assemble and disassemble, without thereby having to accept considerable noise emissions when driving the Agitatorwalze in purchasing. As a result, the floor nozzle can absorb very effectively and quietly dissolved dirt particles and thus ensure effective dust pickup, especially on carpets. With such a floor nozzle, the dust absorption efficiency - in particular on carpets - can thus be advantageously increased, Thus, even at low recording powers good performance classes and dust absorption values can be achieved without the noise emission through the floor nozzle unnecessarily increases.

The floor surface may be covered by a textile floor covering such as a carpet or carpet or by a hard floor such. As a wood parquet, laminate or PVC flooring are formed.

The vacuum cleaner may have a fan for generating a negative pressure, through which the floor nozzle guided over a floor surface to be cleaned receives dust and dirt from the floor surface. For this purpose, the floor nozzle is moved back and forth by the user by means of push and pull movements in the machine direction. As a result, the floor nozzle slides over the floor surface to be cleaned. Especially with long-pile carpets, the underside of the floor nozzle slides over the carpet, while the underside of hard floors spaced, possibly by spacer bristles, floats over these bottom surfaces. The user can handle for example a connected to the suction pipe handle of the vacuum cleaner. So that the cleaning and care of the floor covering can be carried out as effectively as possible, the suction mouth is elongated and extends substantially transversely to the machining direction. In this context, elongated means that the preferably substantially rectangular suction mouth has a greater length transversely to the machining direction than the width in the machining direction. The suction mouth is preferably between 20 and 30 cm across the processing direction long. The floor nozzle can also be arranged on a self-propelled vacuum cleaner, in particular suction robot, so that the machining direction of the floor nozzle corresponds to the direction of travel of the self-propelled vacuum cleaner. A vacuum cleaner housing of the vacuum cleaner may have a dust receiving chamber in which the dust received via the floor nozzle can be collected, for example, in a dust bag.

Advantageous embodiments and modifications of the invention will become apparent from the following dependent claims.

According to an advantageous embodiment of the invention, it is provided that the angle at which the conically tapered to the stem tip thread tapers, between 5 and 15 degrees, preferably at 10 degrees. Such a tapered thread can make the tolerance compensation between the driver and the driver receiving particularly effective. The thread thus formed ensures a secure hold of the driver in the driver receiving. As a result, the noise of the floor nozzle when driving the Agitatorwalze can be reduced very easily with the thread.

An advantageous embodiment is that the at least one thread has rounded flanks. The rounding of the flanks of the thread facilitates the assembly and disassembly of the driver and the driver receiving, so that the floor nozzle can be easily manufactured and maintained. In addition, the rounding of the flanks of the thread leads to a simpler tolerance compensation and a more uniform centering between the driver and the cam receiver, whereby the noise emission when driving the Agitatorwalze can be further reduced.

A preferred embodiment provides that the shank tip of the shank has a remaining area without a thread extending beyond it. The remaining free area on the shaft tip simplifies the insertion of the driver into the bore of the driver receiving, whereby the assembly and disassembly during the preparation of the floor nozzle but also during the maintenance of the floor nozzle is simplified. The remaining free area of the shaft serves as the first centering of the driver in the driver receiving, so that the two components can be rotated against each other for further assembly until the thread engages the shaft in the corresponding shape of the bore.

Particularly advantageous is the embodiment that the shaft has a coaxial with the axis of rotation arranged centering bore with beveled from the shaft tip Montagefase at the shaft tip. With such a centering hole, the driver can be very easily mounted in the drive unit, which significantly simplifies the production of the floor nozzle.

Further advantageous is the configuration that the flank profile of the at least one thread tapers along the axis of rotation to the stem tip. The taper of the edge profile reduces on the one hand the material required for the production of the driver, on the other hand, the taper of the flank profile provides an additional positive connection between the driver and the driver receiving. In addition, the assembly and disassembly of driver and Mitnehmeraufnahme is simplified, which significantly simplifies the production of the floor nozzle and the maintenance of the floor nozzle, in particular by removing the Agitatorwalze. The tapered flank profile leads to a reliable tolerance compensation between the driver and the cam receiver and reduces noise that results from the drive of the Agitatorwalze with the drive unit.

An advantageous embodiment of the invention provides that the thread essentially forms a round profile thread with approximately the same flank angles. Such a thread ensures a secure hold of the driver in the driver receiving and allows a reliable tolerance compensation between the two components of the Drive unit, as they can be very easily screwed against each other over the thus formed thread.

According to an advantageous embodiment of the invention, it is provided that the corresponding bore of the cam receiver has at least one corresponding to the at least one thread of the driver thread, wherein a formed in the driver receiving, is provided to the at least one thread of the driver receiving recess extending mounting guide. The corresponding with the shaft and the thread arranged bore has a corresponding shape for receiving the driver in the driver receiving. For easier assembly and disassembly of the driver and the Mitnehmeraufnahme during the preparation of the floor nozzle and the maintenance of the floor nozzle, the cam receiver on a mounting guide slope. About this mounting guide slope of the thread of the driver is guided in the thread of the driver. As a result, the user must position the two components of the drive unit, so the driver and the cam receiver, less accurate to each other to mount them, which makes this process handy.

A preferred embodiment provides that the thread of the driver has three threads which are fixed in a star-shaped manner on a plate-shaped head. The arrangement of three threads, which are fixed in a star shape on the plate-shaped head, creates a stable and easy to manufacture form of the driver. Due to the three threads, the torque to be transmitted via the driver is distributed uniformly, so that the flank profile of the individual threads can be made thinner in order to save material. In addition, several threads lead to a more uniform support of the driver on the cam receiver, which improves the centering by the conically tapered thread. The formation of the plate-shaped head reduces the material required for the production of the driver. To the plate-shaped head of the shaft connects with the conically tapered to the stem tip thread. This may also be attached to the plate with more than three or fewer than three threads.

Furthermore, the subject matter of the invention is a vacuum cleaner for cleaning and care of floor surfaces with a fan for generating a negative pressure for receiving dirt by means of an air flow and a separation system for cleaning the air taken from the dirt, wherein the already described in more detail below vacuum cleaner and a floor nozzle according to has the previous and following description.

Figur 1

Erfindungsgemäßer Staubsauger mit Bodendüse,

Figur 2

Bodendüse in perspektivischer Seitenansicht,

Figur 3

Bodendüse in Schnittdarstellung,

Figur 4

Mitnehmer in perspektivischer Seitenansicht,

Figur 5

Mitnehmer in Seitenansicht,

Figur 6

Mitnehmer in Schnittdarstellung,

Figur 7

Mitnehmer in Draufsicht,

Figur 8a

Mitnehmer in Mitnehmeraufnahme,

Figur 8b

Mitnehmer in Mitnehmeraufnahme teilweise eingeschraubt,

Figur 8c

Mitnehmer in Mitnehmeraufnahme vollständig eingeschraubt,

Figur 9

Mitnehmer und Mitnehmeraufnahme in Schnittdarstellung,

Figur 10

Mitnehmer in perspektivischer Seitenansicht,

Figur 11

Mitnehmer in Seitenansicht,

Figur 12

Mitnehmer in Mitnehmeraufnahme mit Montageführungsschrägen.

Further features, details and advantages of the invention will become apparent from the following description and from the drawings. Embodiments of the invention are shown purely schematically in the following drawings and will be described in more detail below. Corresponding objects or elements are provided in all figures with the same reference numerals. It shows

FIG. 1

Vacuum cleaner according to the invention with floor nozzle,

FIG. 2

Floor nozzle in perspective side view,

FIG. 3

Floor nozzle in section,

FIG. 4

Driver in perspective side view,

FIG. 5

Driver in side view,

FIG. 6

Driver in section,

FIG. 7

Driver in plan view,

FIG. 8a

Driver in driver intake,

FIG. 8b

Carrier partially entrained in driver receptacle,

FIG. 8c

Carrier completely screwed into cam receiver,

FIG. 9

Driver and driver receiver in sectional view,

FIG. 10

Driver in perspective side view,

FIG. 11

Driver in side view,

FIG. 12

Driver in Mitnehmeraufnahme with mounting guide slopes.

In the figures, designated by the reference numeral 1, a floor nozzle is shown purely schematically. The representation according to FIG. 1 shows a vacuum cleaner 2 according to the invention with a connected to the vacuum cleaner 2 floor nozzle 1. The vacuum cleaner 1 shown in the embodiment is a so-called canister vacuum cleaner. The floor nozzle 1 is connected here via its connecting piece 30 with a preferably telescopically designed suction tube 37. Furthermore, the floor nozzle 1 in this embodiment shown on a separate from the vacuum cleaner housing 32, 32 a housing 3. The telescopic suction tube 37 merges into a handle 38, to which a suction hose 27 is connected, which is connected to the vacuum cleaner housing 32, 32 a. An electric connection cable 33 is used to operate a blower (not shown) of the vacuum cleaner 2, which is integrated in the vacuum cleaner housing 32, 32a, in order to generate a negative pressure. By means of this negative pressure dirt and dirt are taken up by the floor surface 50 to be cleaned by a stream of air through the suction 6 of the floor nozzle 1 and transported via the suction pipe 37 and the suction hose 27 into the housing 32, 32 a of the vacuum cleaner 2. Provided in this housing 32, 32a is a separation system 35, which in the exemplary embodiment is designed as a dust bag. This separation system 35 is located in a through the This dust chamber 36 is shown by a folding mechanism between the vacuum cleaner housing parts 32 and 32a accessible and open, so that the separation system 35 is visible and removable. For the operation of the vacuum cleaner 2, the dust chamber 36 is closed and creates a negative pressure. The air flow generated by the negative pressure is freed of dirt and dirt in the separation system 35 and led out of the vacuum cleaner 2 via an exhaust air grille 34. To turn on and off the vacuum cleaner 2, this has a treadle 29. This treadle 29 includes switches that are sufficiently large for a user to manipulate with their foot. The treadle circuit 29 usually also has a switch for actuating the automatic winder for the connection cable 33 (not shown) integrated in the vacuum cleaner housing 32, 32a. On the handle 38 is also a manual circuit 28, with the functions of the vacuum cleaner 2 can be activated. In addition, the vacuum cleaner 2 can be switched on and off via the manual circuit 28, and power levels of the fan (not shown) can be selected. A user of the vacuum cleaner 1 can grasp it on the handle 38 and thus push the floor nozzle 1 forward and backward in a machining direction 5 marked by means of a push and pull movement in the machining direction 5, in order to clean the floor surface 50. In this case, the floor nozzle 1 slides over the floor surface 50 to be cleaned. Particularly in the case of long-pile carpets, the underside 4 slides (FIG. Fig. 2 ) of the floor nozzle 1 over the bottom surface 50, while the bottom 4 ( Fig. 2 ) spaced apart on hard floors, possibly by spacer bristles, hovers over these bottom surfaces 50 away. In the illustrated embodiment, the floor nozzle 1 also supporting elements 31 in the form of wheels, which ensure a defined distance of the bottom 4 to be cleaned to the bottom surfaces 50 and easy handling when pushing back and forth the floor nozzle 1.

The FIG. 2 shows a floor nozzle 1 according to the invention for a vacuum cleaner 2 ( Fig. 1 ) in a perspective side view. In the embodiment illustrated here, the housing 3 forms one of the bottom surface 50 (FIG. Fig. 1 ) in the machining position facing bottom 4, which by Abstütztelemente 31 spaced from the bottom surface 50 (FIG. Fig. 1 ) is guided.

The FIG. 3 shows schematically a floor nozzle 1 according to the invention FIG. 2 for a vacuum cleaner 2 ( Fig. 1 ) for cleaning and maintaining floor surfaces 50 ( Fig. 1 ) in a sectional view in the direction of the working position of the bottom surface 50 (FIG. Fig. 1 ) facing bottom 4 ( Fig. 2 ). As can be seen from this illustration, the floor nozzle 1 has an elongated agitator roller 7, which extends transversely to the machining direction 5 and which is rotatably driven by a drive unit 8 on the floor nozzle 1. To drive the Agitatorwalze 7, the floor nozzle 1 according to the illustrated embodiment, an electric motor 39 which is connected via tension members 40 to the drive unit 8. As an alternative to the electric motor 39, the floor nozzle 1 may also have a turbine which is driven by the suction air flow generated in the vacuum cleaner 2. The drive unit 8 comprises a driver 10 which rotates on the axis of rotation 9 of the agitator roller 7 and which is designed to transmit a torque to the agitator roller 7 and thus to rotate the agitator roller 7 on the axis of rotation 9. The driver 10 is received by a rotating on the axis of rotation 9 cam receiver 18 in a corresponding manner with the driver bore 19. The driver seat 18 is connected in the embodiment shown with the rotating about the axis of rotation 9 Agitatorwalze 7, so that the drive power of the electric motor 39 can be transmitted. The agitator roller 7 can be used to machine the bottom surface 50 (FIG. Fig. 1 ) Brush filaments, rubber lips, both or other agitators. A more detailed description of the driver 10 shown and the indicated driver receptacle 18 is made for reasons of clarity with reference to the following figures.

The FIG. 4 shows a driver 10 according to the invention in a perspective side view. The driver 10 is for transmitting a torque to the Agitatorwalze 7 (FIG. Fig. 3 ) and, according to the exemplary embodiment, on the rotation axis 9 (FIG. Fig. 3 ) of the agitator roller 7 in the floor nozzle 1 ( Fig. 3 ) arranged. The driver 10 has a plate-shaped head 11 and a cylindrical shaft 12. The cylindrical shaft 12, which extends orthogonally to the plate plane, is connected to the head 11 at one end 13, the circular plate 11 and the cylindrical shaft 12 being coaxial with the axis of rotation 9 (FIG. Fig. 3 ) are arranged. On the side opposite the plate 11, the shank 12 has an end 14, also referred to below as a loose shank tip 15. On the shaft 12, in the example shown here, there are three threads 16, 16a, 16b of an external thread 17 extending along the shank 12. The thread 17 formed by the three threads 16, 16a, 16b tapers along the axis of rotation 9 in a tapered manner to the shank tip 15 out. This means that the envelope contour of the threads 16, 16a, 16b forms a conical outer contour when rotating about the axis of rotation 9. As can be clearly seen, the thread 17 does not extend completely along the shank 12, but at the shank tip 15 a remaining area 21 is formed. This remaining area 21 makes the assembly of the driver 10 in the driver receptacle 18 (FIG. Fig. 8a . 8b . 8c ) easier, as will be explained below. At the shaft tip 15 a coaxial with the axis of rotation arranged centering bore 22 is provided, which has a mounting phase 23 which starts directly on the shaft tip 15. As in FIG. 4 As can be clearly seen, the three threads 16, 16a, 16b which extend along the shank 12 are also connected to the dish-shaped head 11. The connection of the threads 16, 16a, 16b and the plate-shaped head 11 has a star-shaped contour, which forms the attachment. This star-shaped contour ensures a uniform distribution of force in the driver 10 and makes it particularly robust.

The FIG. 5 shows a driver 10 according to FIG. 4 in a side view. In this side view, it can be seen that the plate-shaped head 11 forms a rotationally symmetrical structure about the axis of rotation 9, which is shown here in phantom. Also, the cylindrical shaft 12 is designed as a rotationally symmetrical formation about the drawn axis of rotation 9. Along the marked axis of rotation 9, the thread formed by the three threads 16, 16a, 16b 17 extends on the cylindrical shaft 12. The thread 17 tapers along the axis of rotation 9 to the shaft tip 15 in the form of a cone. This is indicated by the dashed lines indicated outer contour 41 of the threads 16, 16 a, 16 b. The angle at which the conical thread 17 tapers towards the stem tip 15 is 10 degrees, but may also be in the range between 5 degrees and 15 degrees. This angle is indicated by the dashed lines 41 of the outer contour. The rounded flanks 20, 20a of the threads 16, 16a, 16b extend from the flank profile of the threads 16, 16a, 16b up to the cylindrical shaft 12. It can also be seen that the remaining area 21 on the shaft tip 15 has no thread 17.

The FIG. 6 shows a sectional view through the driver 10 according to FIG. 5 , As a result, the expansion of the centering bore 22 with the mounting phase 23 bevelled by the shaft tip 15 can be recognized particularly well. About this centering bore 22 of the driver 10 is fixed in the floor nozzle 1, as is made FIG. 3 is apparent. The provided in the driver 10 centering hole 22 reduces the material required for the production of the driver 10 and makes it easier. It can also be clearly seen in this illustration that the shank 12 extending in a cylindrical manner along the axis of rotation 9 is fastened orthogonally to the dish-shaped head 11. Along the shank 12, the thread 17 extends, wherein at the stem tip 15 a remaining free area 21 is obtained. The thread 17 is substantially formed as a round profile thread with approximately the same flank angles, as shown in the sectional view FIG. 6 evident. The flanks 20, 20a of the threads 16, 16a, 16b are rounded in order to simplify the manufacture and assembly of the driver 10 with the catch receptacle 18.

Out FIG. 7 is a plan view of the driver 10, which from the view of the axis of rotation 9 (FIG. Fig. 6 ) is oriented. On the plate-shaped head 11, the threads 16, 16a, 16b of the conically tapered towards the stem tip 15 thread 17 are shown. It can be seen that the flanks 20, 20a of the conical thread are rounded. The conically tapering to the shaft tip 15 out contour of the threads 16, 16 a, 16 b can also be seen from the fact that arranged in the vicinity of the shaft tip 15 part of a thread 16, 16a, 16b the adjacent underlying thread 16, 16a, 16b only partially covered.

The FIG. 8a shows a first step in the assembly of the driver 10 in the corresponding driver receptacle 18. The driver receptacle 18 has to transmit a torque to the Agitatorwalze 7 (FIG. Fig. 3 ) on the cylindrical shaft 12 and the tapered to the shaft tip 15 tapered thread 17 of the driver 10 corresponding bore 19. The corresponding bore 19 has star-shaped threads 25, 25a, 25b for receiving the conically tapering to the shaft tip 15 thread 17 of the driver 10. The threads 25, 25a, 25b of the corresponding bore 19 are tapered corresponding to the thread 17 of the driver 10. As a result, a reliable centering of the driver receptacle 18 on the driver 10 is possible and it turns when driving the Agitatorwalze 7 (FIG. Fig. 3 ) by the drive unit 8 a reliable positive engagement, the vibration of the Agitatorwalze 7 ( Fig. 3 ) significantly reduced. To the driver 10 and the cam receiver 18 in the context of the production of the floor nozzle 1 ( Fig. 1 ) or during maintenance in the context of removal of the Agitatorwalze 7 ( Fig. 3 ) into one another, the driver 10 is inserted with the remaining free area 21 of the shaft 12 in the corresponding hole 19, as is made FIG. 8a is apparent.

By turning the driver 10 and the driver seat 18 against each other, find the slightly chamfered threads 16, 16a, 16b of the external thread 17 easily into the threads 25, 25a, 25b provided in the corresponding hole 19 thread, as shown in FIG. 8b is indicated. By screwing the driver seat 18 on the driver 10, there is a positive connection in FIG. 8c is shown. Between the dish-shaped head 11 and the plate-shaped end 42 of the cam receiver 18 is, as in FIG. 8c can be seen, a gap provided, which is maintained as tolerance compensation in positive engagement of the driver 10 and the driver seat 18. This also goes from the sectional view according to FIG. 9 which shows a position of the driver 10 and the driver receiving 18 according to FIG. 8c shows.

In FIG. 9 is a sectional view through a driver 10 according to the invention and a Mitnehmeraufnahme 18 according to the invention shown, wherein the driver 10 is arranged in the Mitnehmeraufnahme 18 so that there is a positive connection. This form-fit is produced by the tapered to the stem tip 15 towards the thread 17 of the driver 10 and the corresponding, receiving bore 19 of the driver 18 receiving. The driver seat 18 takes the driver 10 in this case so far that positive engagement exists. Between the plate-shaped head 11 of the driver 10 and the plate-shaped end 42 of the cam receiver 18 remains in the FIG. 9 obtained apparent gap, which serves as a tolerance compensation. This gap is reduced and enlarged in a certain range depending on tolerance deviation of the driver 10 and the driver seat 18. If the bore 19 in the driver receptacle 18 at the tolerance upper limit of the set dimension, so shifts the terminal point or the point of the form fit between the driver 10 and the cam receiver 18 is in this view to the left. This means that the driver 10 is screwed into the driver receptacle 18 until the conical contour of the threads 16, 16a, 16b, 25, 25a, 25b sets a clamp between the driver 10 and the driver receptacle 18. If the corresponding bore 19 of the driver receptacle 18 at the tolerance lower limit of the specified dimension, so the terminal point shifts, so the point at the positive connection between the driver 10 and the driver seat 18 is in this view to the right. The same applies to dimensional deviations of the conical thread 17 of the driver 10. As a result, a particularly effective tolerance compensation is possible, which enables a low-vibration drive of the Agitatorwalze 7 in the floor nozzle 1.

The FIG. 11 shows a supplementary embodiment of the driver in a side view. The conical tapering to the shaft tip 15 thread 17 here has threads 16, 16a, 16b, the flank profile 24 along the axis of rotation 9 to the shaft tip 15 also tapers. By this additional taper of the screw geometry, an additional positive locking can be achieved. In addition, the assembly and disassembly of driver 10 and driver receptacle 18 is simplified, which significantly simplifies the production of the floor nozzle 1 and the maintenance of the floor nozzle 1, in particular by removing the agitator roller 7. The tapered flank profile 24 improves the above-described tolerance compensation between the driver 10 and the driver receptacle 18 and further reduces noise caused by the drive of the Agitatorwalze 7 with the drive unit 8.

Out FIG. 12 is a supplementary embodiment of the driver 18 recording. The cam receiver 18 shown here has to the threads 25, 25a, 25b of the bore 19 extending mounting guide bevels 26, 26a 26b. About this Montageführungsschrägen 26, 26 a 26 b, the threads 16, 16 a, 16 b of the external thread 17 are guided to the threads 25, 25 a, 25 b of the internal thread of the bore 19 when assembling the driver 10 and the driver receptacle 18, which the assembly of the driver seat 18 and Driver 10 simplified.

Described is a summary of a floor nozzle 1 for a vacuum cleaner 2 for cleaning and care of bottom surfaces 50, with a housing 3, which has a in working position of the bottom surface 50 facing bottom 4, on which an elongated, transverse to Machining direction 5 extending suction mouth 6 is arranged, wherein the floor nozzle 1 has at least one elongate, transverse to the machining direction 5 extending agitator 7, which is rotatably driven via a drive unit 8 to the floor nozzle 1, wherein the drive unit 8 a rotating on a rotation axis 9 carrier 10th comprises for transmitting a torque to the Agitatorwalze 7, wherein the driver 10 has a plate-shaped head 11 and a cylindrical shaft 12, wherein the head 11 and the shaft 12 are arranged coaxially to the axis of rotation 9, the shaft 12 at one end 13 with the Head 11 is connected and at the other end 14 of the shaft 12 forms a loose shaft tip 15, wherein the shank 12 at least one thread 16, 16a, 16b of a along the axis of rotation 9 conically tapered to the shaft tip 15 thread 17 extends, wherein the drive unit a rotating on the axis of rotation 9 driver receptacle 18 which a with the cylindrical shaft 12 and the tapered to the stem tip 15 thread 17 of the driver 10 corresponding bore 19 and a vacuum cleaner 2 with such a floor nozzle first

Of course, the invention is not limited to the illustrated embodiments. Further embodiments are possible without departing from the basic idea. Thus, the floor nozzle 1 may also be formed as part of a self-propelled vacuum cleaner.

LIST OF REFERENCE NUMBERS

1

floor nozzle

2

vacuum cleaner

3

casing

4

Bottom (sliding sole)

5

machining direction

6

saugmund

7

agitator roller

8th

drive unit

9

axis of rotation

10

takeaway

11

head

12

shaft

13

First end (shaft)

14

Second end (shaft)

15

shaft tip

16

16a 16b thread (external thread)

17

Thread (external thread)

18

driver receptacle

19

Bore (driver receiving)

20

20a flanks (thread)

21

non-binding area

22

Zentrierungsbohrung

23

Montagefase

24

Flank profile (thread)

25 25a 25b

Thread (internal thread)

26 26a 26b

Installation guide slope

27

suction

28

manual gearshift

29

enters circuit

30

spigot

31

support elements

32 32a

Vacuum cleaner housing, vacuum cleaner housing parts

33

connection cable

34

Abluftgitter

35

Separating

36

dust chamber

37

suction tube

38

handle

39

electric motor

40

tension elements

41

outer contour

42

graduation

50

floor area

Claims (10)

1. Floor nozzle (1) for a vacuum cleaner (2) for cleaning and care of floor surfaces (50), the floor nozzle (1) comprising at least one elongate agitator roller (7) which extends transversely to the treatment direction (5) and is rotatably driven on the floor nozzle (1) by means of a drive unit (8), the drive unit (8) comprising an entraining element (10), which rotates on an axis of rotation (9), for transmitting a torque to the agitator roller (7), the entraining element (10) comprising a shaft (12), the shaft (12) being arranged so as to be coaxial with the axis of rotation (9) and forming a loose shaft tip (15) at one end (14), characterised in that at least one thread turn (16, 16a, 16b) of a thread (17), which tapers conically along the axis of rotation (9) to the shaft tip (15), extends on the shaft (12), the drive unit (8) comprising an entraining element receptacle (18), which rotates on the axis of rotation (9) and has a hole (19) that corresponds to the shaft (12) and the thread (17) of the entraining element (10) that tapers conically to the shaft tip (15).
2. Floor nozzle (1) according to claim 1, characterised in that the angle (X) around which the thread (17), which conically tapers to the shaft tip (15), tapers is between 5 and 15 degrees, preferably 10 degrees.
3. Floor nozzle (1) according to either claim 1 or claim 2, characterised in that the at least one thread turn (16, 16a, 16b) has rounded flanks (20, 20a).
4. Floor nozzle (1) according to any of claims 1 to 3, characterised in that the shaft tip (15) of the shaft (12) has a region (21) that remains free, without a thread (17) extending across it.
5. Floor nozzle (1) according to any of claims 1 to 4, characterised in that the shaft (12) comprises, on the shaft tip (15), a centring hole (22) which is arranged so as to be coaxial with the axis of rotation (9) and has an assembly bevel (23) that slopes away from the shaft tip (15).
6. Floor nozzle (1) according to any of claims 1 to 5, characterised in that the flank profile (24) of the at least one thread turn (16, 16a, 16b) tapers along the axis of rotation (9) to the shaft tip (15).
7. Floor nozzle (1) according to any of claims 1 to 6, characterised in that the thread (17) substantially forms a round profile thread with approximately identical flank angles.
8. Floor nozzle (1) according to any of claims 1 to 7, characterised in that the corresponding hole (19) of the entraining element receptacle (18) comprises at least one thread turn (25, 25a, 25b) that corresponds to the at least one thread turn (16, 16a, 16b) of the entraining element (10),
   an assembly guide slope (26, 26a, 26b) being provided, which is formed in the entraining element receptacle (18) and extends to the at least one thread turn (25, 25a, 25b) of the entraining element receptacle (18).
9. Floor nozzle (1) according to any of claims 1 to 8, characterised in that the thread (17) of the entraining element (10) has three thread turns (16, 16a, 16b), which are fastened to a disc-shaped head (11) so as to be in the form of a star.
10. Vacuum cleaner (2) for cleaning and care of floor surfaces (50), comprising a fan for generating a negative pressure for picking up dirt using an air flow, and a separation system (24) for cleaning dirt from the taken-in air, characterised by a floor nozzle (1) according to any of the preceding claims.

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