Patent Application
20160073841
The present invention relates to a nozzle for a vacuum cleaner comprising a rotatable member and a cleaning arrangement for removing articles entangled to the rotatable member. The invention is intended for battery powered vacuum cleaners as well as mains-operated vacuum cleaners. The nozzle according to the present invention is further envisaged for robotic vacuum cleaners.
In vacuum cleaning nozzles provided with a rotatable member, i.e. a rotatable brush roll, it is known that threads, lint, human or animal hairs or any other fibrous material tend to cling or wrap around adhere to the brush roll during operation of the vacuum cleaner. This may impair the functioning of the cleaning nozzle.
In WO2009/117383A2 it is disclosed a cleaning nozzle for a vacuum cleaner provided with a rotary brush having projecting friction surfaces and one or more cleaning members for removing debris that has been wrapped around the rotary brush. The cleaning members are positioned adjacent the rotary brush and are adapted to move between a resting position and a cleaning position, and are arranged to clean the rotary brush during rotation of the brush. Debris that has been collected on a rotary brush is often difficult to remove because it has wrapped tightly around the brush roll and intertwined the bristles. Therefore, a significant force is needed to be able to thread off the entangled threads by means of a cleaning member pressing against a friction member. Such a force may be applied manually by a user of the vacuum cleaner. The electrical vacuum cleaner or motor brush head need to be capable of providing the necessary power to obtain rotation of the brush roll when such force is applied.
A drawback with the disclosed design is that the brush roll rotates during a cleaning action and may cause wear on a surface on which the nozzle rests during the cleaning action, such as a carpet or a wooden floor.
An object of the present invention is to overcome the above mentioned drawback relating to potential wear of a surface on which the nozzle rests during a cleaning action.
This object is achieved according to a first aspect of the invention by a nozzle for a vacuum cleaner. The nozzle comprises a rotatable member for picking up particles from a surface to be cleaned. The rotatable member is arranged around a longitudinal axis. The nozzle further comprises a cleaning arrangement for removing articles entangled to the rotatable member. The cleaning arrangement comprises at least one support surface provided on at least one radially projecting member of the rotatable member, and at least one cleaning member. The rotatable member is movable between a first position in which the cleaning member is arranged at a distance from the support surface and a second position in the vicinity of the rotatable member in which the cleaning member, during rotation of the rotatable member, co-operates with at least one segment of the support surface to remove any entangled articles from the rotatable member.
By having the rotatable member move between the first and the second position in the nozzle when debris is to be picked up on a surface underlying the nozzle on the one hand, and when articles entangled to the rotatable member are to be removed by the cleaning member on the other, the rotatable member will advantageously not be in contact with the underlying surface when a cleaning action is to be performed. i.e. when the rotatable member is set into contact with the cleaning member to remove the entangled articles. This eliminates the risk of having the rotatable member cause wear on a surface on which the nozzle rests during the cleaning action, such as a carpet or a wooden floor.
By providing resilient contact for a cleaning action, the necessary power to obtain rotation of a rotatable member, such as a brush roll, is limited compared to earlier solutions. Thereby, proper cleaning function is ensured during cleaning action.
The object is achieved according to a second aspect of the invention by a vacuum cleaner provided with such a nozzle.
In an embodiment of the present invention, the cleaning member comprises a sheet member, preferably a resilient sheet member, capable of providing a resilient contact with at least one segment of the at least one support surface in the at least one cleaning position during rotation of the rotatable member. Advantageously, by providing resilient contact for a cleaning action, the necessary power to obtain rotation of a rotatable member, such as a brush roll, is limited compared to earlier solutions. Thereby, proper cleaning function is ensured during cleaning action.
In embodiments, the cleaning member comprises a longitudinal bar holding the sheet member, preferably a resilient sheet member. The longitudinal bar is arranged along a longitudinal axis of the rotatable member.
In embodiments, the sheet member, preferably a resilient sheet member, of the cleaning member in the at least one cleaning position meets a tangent of the at least one segment of the at least one support surface at an angle a which is in the range of 40°-90°. The angle is chosen to enable efficient cleaning but still enable rotational movement of the rotatable member of the nozzle to ensure proper cleaning function during cleaning operation.
In embodiments, the sheet member, preferably a resilient sheet member, has a thickness in the range of 0.2-0.8 mm.
In embodiments, the at least one radially projecting member is helically arranged along a longitudinal axis of the rotatable member. The helical arrangement ensures proper cleaning of the rotatable member during rotation while at the same time the cleaning interaction is performed within a limited support surface. Thereby, the impact on the rotational speed of the rotatable member is reduced and an effective cleaning action is performed while at the same time normal cleaning operation is maintained.
In embodiments, one single radially projecting member is helically arranged along a longitudinal axis of the rotatable member.
In embodiments, a plurality of radially projecting members is helically arranged along a longitudinal axis of the rotatable member.
In embodiments, the rotatable member is moved from the first position to the second position by applying a pressing force to a push button provided on the nozzle at a surface turned towards a user.
In embodiments, at least one of the lever arms is connected via a linking mechanism to the push button on the nozzle.
In embodiments, at least one protruding part is arranged on the nozzle at a surface turned towards the surface to be cleaned. When a cleaning action is performed, the protruding part prevents the nozzle from tilting due to the force applied on it.
In embodiments, the rotatable member comprises radial ribs arranged perpendicular to the longitudinal axis of the rotatable member.
In embodiments, the radial ribs extend from the rotatable member to the at least one projecting member creating multiple pockets along the rotatable member. The multiple pockets hinder entangled articles from wandering towards the middle segment of the rotatable member. Thereby, entangled articles are distributed along the length of the rotatable member. Even distribution of the entangled articles is advantageous because the layers of entanglement will be fewer. Fewer revolutions of the rotatable member will then be needed for proper cleaning. The total cleaning time is thereby reduced.
In embodiments, the at least one support surface comprises a plurality of segments. Each of the segments is arranged at an individual radius in relation to the longitudinal axis. By choosing proper radius of the segments, the sheet member of the cleaning member will be in resilient contact with a limited area of the support surface. Contact in a limited area such as a single point ensure efficient cleaning while still not disturbing normal cleaning operation.
In embodiments, the radius of the segments is gradually changed whereby the segments form a continuous support surface.
In embodiments, a plurality of support surfaces is arranged on a plurality of radially projecting members.
In embodiments, the nozzle further comprises a nozzle cover that at least partly is made of transparent material such that the rotatable member may be visible through the nozzle cover. Thereby, the user is able to see if there are a lot of entangled articles present requiring a cleaning action to be performed.
The object of the present invention is further attained in a third aspect of the present invention by a nozzle for a vacuum cleaner. The nozzle comprises a rotatable member for picking up particles from a surface to be cleaned. The rotatable member is arranged around a longitudinal axis and comprises at least one support surface provided on at least one radially projecting member of the rotatable member. The rotatable member is movable between a first position, in which it is arranged to pick up particles from a surface to be cleaned, and a second position in which an external cleaning member cooperates with at least one segment of the support surface to remove any entangled articles from the rotatable member, the rotatable member projecting further out from the nozzle when in the second position than when in the first position.
The object of the present invention is further attained in a fourth aspect of the present invention by a cleaning arrangement comprising a socket for receiving the vacuum cleaner nozzle of the third aspect of the invention and at least one cleaning member arranged in the socket for cooperating with the rotatable member to remove articles entangled to the rotatable member when in the second position.
Thus, the nozzle of the vacuum cleaner is positioned in the socket of the cleaning arrangement of the fourth aspect of the present invention, wherein the rotatable member embodied in the form of a brush roll arranged around a longitudinal axis of the nozzle and employed for picking up particles from a surface to be cleaned cooperates with a correspondingly longitudinally extending cleaning member of the socket when the rotatable member is in the second position and set to rotate by having a user operating the vacuum cleaner to start the rotation, or by having the rotation start automatically when the arrangement receives the vacuum cleaner. Hence, the cleaning member will cooperate with the rotating brush roll of the vacuum cleaner to remove articles such as threads, lint, human or animal hairs or any other fibrous material which wraps around or adheres to the brush roll. To this end, the cleaning member is arranged to be positioned on a small distance from, or even in contact with, the rotating brush roll when the articles are to be removed. Advantageously, the debris is removed from the brush roll without having the user going through the tedious and awkward process of removing it manually. Further advantageous is that the cleaning arrangement of the fourth aspect of the present invention is arranged externally from the nozzle and thus no longer contained in the nozzle itself.
In an embodiment of the present invention, the cleaning arrangement is arranged in a charging stand for charging the vacuum cleaner. Thus, the vacuum cleaner nozzle according to the third aspect of the present invention is positioned in the socket of the charging stand whereupon the brush roll is set to rotate to commence cleaning thereof while the battery of vacuum cleaner simultaneous is charged. This embodiment further has the advantage that the vacuum cleaner will have access to required operating power for rotating the brush roll when cleaning of the brush roll is to be undertaken.
In an alternative embodiment of the present invention, the cleaning arrangement of the third aspect of the present invention is arranged to be hand-held. By providing a hand-held and portable cleaning arrangement, a user can advantageously move the arrangement around his/her house and clean the vacuum cleaner brush roll without having to position the vacuum cleaner in its charging stand. Such cleaning arrangement could further be used with vacuum cleaners which are not battery-driven and hence do not have an associated charging stand.
In a further embodiment of the fourth aspect of the present invention, the cleaning member comprises a sheet member, preferably a resilient sheet member, capable of providing a resilient contact with the rotatable member of the vacuum cleaner nozzle when in the second position. Advantageously, by providing resilient contact for a cleaning action, the power required by the vacuum cleaner to obtain rotation of the rotatable member is less as compared to a rigid, non-resilient cleaning arrangement. A further advantage is that wear of the rotatable member caused by the cleaning member decreases.
Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following description. Disclosed features of example embodiments may be combined to create embodiments other than those described in the following as readily understood by one of ordinary skill in the art to which this invention belongs, without departing from the scope of the present invention, as defined by the appended claims.
The various aspects of the invention, including its particular features and advantages, will be readily understood from the following detailed description and the accompanying drawings, in which:
a-d illustrate a cleaning arrangement for the brush roll of the nozzle according to embodiments,
a and 5b show a side view of the cleaning arrangement and the brush roll according to an embodiment,
a and 6b illustrate alternative arrangements in order to protect the cleaning arrangement and the brush roll with bristles from unnecessary wear when the cleaning arrangement is in a resting mode,
a shows a vacuum cleaner nozzle positioned in a cleaning arrangement according to an embodiment of the fourth aspect of the present invention;
b shows the cleaning arrangement of
a shows a portable cleaning arrangement according to an embodiment of the fourth aspect of the present invention;
b shows the portable cleaning arrangement of
The present invention will now be described more fully with reference to the accompanying drawings, in which example embodiments are shown. However, this invention should not be construed as limited to the embodiments set forth herein. Throughout the following description similar reference numerals have been used to denote similar elements, parts, items or features, when applicable.
It should be noted that in an alternative embodiment, the cleaning member 5 is movably arranged in the nozzle 1 such that the cleaning member 5 can be moved towards the rotatable member 3 when a cleaning action is to be undertaken and then move back into the nozzle 1 when the cleaning of the rotatable member 3 has ben performed.
In a further embodiment of the present invention, in the second position, a sheet member 5a, preferably a resilient sheet member, of the cleaning member 5 co-operates with the support surface 4 during rotation of the rotatable member 3 to remove any entangled articles from the rotatable member 3. The sheet member 5a is capable of providing a resilient contact with the support surface 4 in the cleaning position during rotation of the rotatable member 3. Thereby, the possible slow down of the rotational speed of the rotatable member 3 due to the cleaning action will be limited if there is a lot of entangled articles to be removed. As previously mentioned, the nozzle 1 may comprise a cover 12 that at least partly is made of transparent material such that the rotatable member 3 may be visible through the nozzle cover 12. The transparency enables a user to see if a cleaning action is needed or not for the rotatable member 3.
As can be seen, the rotatable member 3 can be moved between the first position where the rotatable member 3 is not in contact with the cleaning member 5 but is lowered towards an underlying surface and thus is set in an debris extracting mode, and the second position where the rotatable member 3 is lifted up from the underlying surface and set into contact with the cleaning member and thus is in a cleaning mode.
a-b illustrates these two different modes of the cleaning arrangement for a brush roll of the nozzle according to an embodiment. The cleaning member 5 is arranged via a longitudinal bar 5b above the rotatable member 3 such that the rotatable member 3 is pivoted from the first position where it contacts the underlying floor for removing debris to a second position where the support surface 4 of the rotatable member 3 comes in contact with the cleaning member 5. The length of the cleaning member 5 is preferably the same as the length of the brush roll that is covered by the support surface 4. Two radially projecting members 13 are helically arranged along a longitudinal axis 10 of the rotatable member 3. The cleaning member 5 comprises a longitudinal bar 5b holding a sheet member 5a, preferably a resilient sheet member. The cleaning member 5 is arranged along a longitudinal axis 10 of the rotatable member 3. The sheet member 5a has preferably a thickness in the range of 0.2-0.8 mm. It is of importance to choose a suited material for the sheet member 5a. The material will, over time, get worn and loose its original tearing ability. To be wear resistant relatively hard spring steel may be used. The edge of the cleaning member 5 that will be in contact with the support surface need to be relatively sharp in order to effectively remove entangled articles. By shearing, or punch pressing the spring steel, one of the edges of the sheared surface will be rounded while the other will have an edge burr. By punch pressing the cleaning member 5 one edge of the cut surface will be sharper than the other. By shearing, or punch pressing, there will be as mentioned above, an edge burr at the cleaning member 5 edge. If the edge burr is minimized this will create a sharp edge suited for cleaning entangled articles from the brush roll. As an alternative to the above mentioned edge burr, the edge of the cleaning member 5 may be sharpened by machining. Thereby, improved tolerance of the sharp edge is achieved.
With further reference to
It should be noted that a number of different ways of applying the force to the lever arms 15, 16 to cause a pivotal movement around the shaft 19 can be envisaged. In an embodiment, a push button 6 (previously illustrated in
In a further embodiment, the nozzle 1 further comprises a locking mechanism arranged to retain the rotatable member 3 in the first position when being activated. This embodiment may be implemented by having the push button 6 enter a locking mode when pressed downwards to an end position, for instance by providing the push button with snap functionality. When pressing the push button 6 downwards a second time, the locking mode is inactivated and the push button 6 will snap out of the locking mode and move from its end position in an upwards direction. This may further require that the push button 6 is arranged to be appropriately spring-loaded to move in the upwards direction.
With reference to
c illustrates a rotatable member 3 shown as a brush roll provided with a support surface 4 with a plurality of segments 4a, 4b, 4c. Each of the segments 4a, 4b, 4c are arranged at an individual radius in relation to the longitudinal axis 10. The radius of the segments is in the shown embodiment gradually changed whereby the segments form a continuous support surface 4. Alternatively, the radius may be changed in steps whereby three separate support surfaces with different radius are provided. The radius of the segment 4a is chosen to enable cleaning contact between the cleaning member and the surface segment 4a, when the rotatable member 3 is in the cleaning position. The radius of the segment 4c is chosen to enable a small distance between the cleaning member 5 and the segment 4c, when the rotatable member 3 is in the cleaning position. The segment 4b is provided with a gradually changing radius providing a smooth transition from the radius of segment 4a to the radius of segment 4c.
In
A problem during cleaning of the brush roll is that entanglement around the brush roll seems not to be evenly spread along the length of the brush roll. Instead, entanglement is of greatest magnitude in the middle segment of the brush roll. Such uneven distribution of the entangled articles is disadvantageous from a brush roll cleaning perspective because cleaning of the top layers of entanglement are performed for each revolution of the brush roll, i.e. the more the layers of entangled articles at a specific segment the longer the total cleaning time. Therefore, the brush roll cleaning time is dependent on the maximum layers of entanglement at one specific segment of the brush roll. Therefore it is more beneficial if the total entanglement is spread out along the length of the brush roll. As seen from the
a and 5b show a detailed side view of the cleaning arrangement and the brush roll according to an embodiment. In
a and 6b illustrate alternative arrangements in order to protect the brush roll from unnecessary wear when in the debris extracting mode. The cleaning member 5 is designed to be protected from wear during normal vacuum cleaning, and also to help in minimizing the wear of the bristles during brush roll cleaning. Hard particles like small stones or the like cleaned up by the rotatable member 3 may contribute to wear of the cleaning member 5, and especially of the sharp edge. As seen in the drawings particles are prevented from contact with the cleaning member 5 by a flange 14 arranged to face the rotatable member 3. Further, the flange 14 delimits wear of bristles on the brush roll due to contact between the bristles and the edge of the cleaning member 5. The bristles will first be in contact with the flange 14. Thereby, the bristles are bent before they get in contact with the edge and wear of the bristles are limited.
When in use, the cleaning arrangement works as follows. During brush roll cleaning the support surface 4 provided on the rotatable brush roll will interact and apply pressure on the cleaning member 5 provided in the nozzle 1 of a vacuum cleaner. During the cleaning process, the motor fan of the vacuum cleaner is also turned on. The support surface 4 is the only area of the brush roll, apart from the bristles, that will be in contact with the cleaning member 5 during a cleaning process. For a full revolution of the brush roll, the entire support surface 4 will have been in contact with the cleaning member 5 and therefore will any entangled article be exposed to the cleaning interaction in between these parts. Entangled articles will get torn into smaller pieces by the tearing, or friction, caused by the cleaning member 5 at the support surface. These torn articles may be separated from the brush roll by the airflow of the vacuum cleaner in combination with centrifugal force due to the rotational movement of the brush roll and will end up in the dust container or dust bag of the vacuum cleaner. The bristles of the brush roll will flex below the cleaning member 5 during brush roll cleaning. Since it is the pressure that the surface of the support surface 4 applies on the cleaning member 5 that generates the majority of the tearing friction, the bristles will not be exposed to the same wear as the entangled articles. Further, since the sheet member 5a, preferably a resilient sheet member, is able to flex, a consistent interaction in between the sheet member 5a and the support surface 4 during brush roll cleaning is achieved, which in turn will lower the tolerances. The brush roll cleaning performance is dependent on the rotational speed of the brush roll; the higher speed, the faster brush roll cleaning. Further on the speed is closely related to the torque; an increased torque will decrease the speed. It is therefore desirable to find a state were the applied torque is high enough for efficient brush roll cleaning whilst at the same time low enough to not decrease the speed too much.
With reference to
The nozzle 1 according to the third aspect of the invention works in a similar manner as that of the first aspect of the invention discussed e.g. with reference to
The difference in movement of the rotatable member 3 of the first aspect of the present as compared to the third aspect of the invention is that the rotatable member 3 according to the third aspect of the invention moves between a first position in which it is arranged to pick up particles from a surface to be cleaned, and a second position in which a cleaning member 5 (for instance the cleaning member arranged in the socket 21 of the charging stand 20 of
However, the rotatable member 3 of the third aspect of the present invention can be moved between the first and second position in the manner shown in
It should be noted that there are several alternatives for raising the cleaning member 5 from the socket 21; for instance, in an embodiment, the cleaning arrangement may comprise a pivot mechanism (not shown) to pivotally move the cleaning member 5 to its cleaning position when the weight of the vacuum cleaner acts on the pivot mechanism. Thus, the vacuum cleaner is positioned in the socket 21 of the cleaning arrangement whereby the cleaning member 5 is raised into the cleaning position, making the complete procedure of setting the cleaning member in its cleaning position automatic from the perspective of the user. Thereafter, the brush roll 3 is set into rotating motion, either automatically or by user operation of the vacuum cleaner. In an alternative, the cleaning member 5 is arranged to be moved from the resting position to the cleaning position by applying a pressing force to a push button (not shown) provided on the socket 21, which force subsequently will act on the pivot mechanism to pivotally move the cleaning member 5 to its cleaning position.
When in use, the cleaning arrangement works as follows. During brush roll cleaning the cleaning member 5 will interact and apply pressure on the support surface 4 provided on the rotatable brush roll 3 of the vacuum cleaner nozzle. During the cleaning process, the motor fan of the vacuum cleaner is also turned on. For the brush roll 3 of
a and b shows an alternative embodiment according to the fourth aspect of the present invention, where the cleaning arrangement 30 is arranged to be hand-held. By providing a hand-held and portable cleaning arrangement, a user can advantageously move the arrangement around his/her house and clean the vacuum cleaner brush roll without having to position the vacuum cleaner in its charging stand. Such cleaning arrangement could further be used with vacuum cleaners which are not battery-driven and hence do not have an associated charging stand. With reference to
Even though the invention has been described with reference to specific exemplifying embodiments thereof, many different alterations, modifications and the like will become apparent for those skilled in the art. The described embodiments are therefore not intended to limit the scope of the invention, as defined by the appended claims.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2013/059148 | 5/2/2013 | WO | 00 |
