WO2018199862A2

WO2018199862A2 - An electronically controlled flushing system

Info

Publication number: WO2018199862A2
Application number: PCT/TR2017/050646
Authority: WO
Inventors: Boğaç ŞİMŞİR
Original assignee: Eczacibaşi Yapi Gereçleri̇ Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇
Priority date: 2016-12-20
Filing date: 2017-12-12
Publication date: 2018-11-01
Also published as: TR201619022A2; WO2018199862A3

Abstract

The electronically controlled flushing system (F) developed according to the present invention is suitable for use in the delivery of water into a toilet bowl wherein said flushing system comprises the reservoir (H) where the water (S) is stored; the passageway (H2) through which the water (S) within the reservoir (H) is delivered into the toilet bowl; the cover (H3) regulating the passage of water through said passageway (H2); the triggering member, which regulates the open/closed position of the cover (H3); the reference electrode (E1) positioned in the reservoir (H) in a way to be on the same level as the minimum water level desired to be present within the reservoir (H); the measurement electrode (E2) positioned into the reservoir (H) in such a way that it is located in an upper part of the reference electrode (E1) and that it corresponds to a predetermined water level, different from the minimum level, within the reservoir (H), said measurement electrode being equivalent to said reference electrode (E1); at least one control unit (U) connected with the reference electrode (E1) and the measurement electrode (E2), said control unit checking and determining the conductivity values of the reference electrode (E1) and the measurement electrode (E2) at the predetermined periods and accordingly determining the level of water within the reservoir (H) and controlling and regulating the operation of the flushing system (F); and at least one control panel (K), which is connected to the control unit (U) and which comprises at least one indicator (K1) for informing the user about the operational status of the flushing system (F).

Description

AN ELECTRONICALLY CONTROLLED FLUSHING SYSTEM

Relevant Technical Field

The present invention relates to the electronically controlled flushing systems.

Prior Art

The flushing systems are the equipment employed in the toilets for the purpose of cleaning the toilet bowls particularly after the use of the same. In said systems, there is present at least one reservoir connected to a water source and said reservoir is connected to the toilet bowl via a passageway. Said passageway is closed by a cover and it assumes the open or closed position by means of a triggering member to provide the control over the flow of water into the toilet bowl through the passageway. In this context, the availability of the flushing systems particularly in the public toilets becomes more of an issue from the point of view of hygiene. However, in the known flushing systems of the art (particularly in the systems with a toilet reservoir that is present as embedded within a wall of the toilet room), it is not possible to determine whether or not the flushing system is operational or whether or not an adequate quantity of water is available within the reservoir unless the triggering member is used. The use of the triggering member mostly takes place following the use of the toilet, in which case the toilet bowl may remain dirty if the flushing system is malfunctioning or if no adequate quantity of water is available within the reservoir.

On the other hand, with the increasing demand for the water resources, it has become a need to more effectively control the water consumption in the flushing systems. By means of the technology advancing in this context, the flushing systems that enable the delivery of different quantities of water into the toilet bowls have been developed to address this need. However, the quantity of water transferred into the toilet bowl in these systems is provided by the mechanical equipment already included in the flushing system wherein said equipment unfortunately fail to be sufficient for the precise control over the quantity of water to be transferred.

Brief Description of the Invention

The electronically controlled flushing system developed according to the present invention is suitable for use in the delivery of water into a toilet bowl particularly for the purpose of cleaning said toilet bowl wherein said flushing system comprises at least one reservoir with at least one bottom where the water obtained from a source is stored; at least one passageway through which the water within the reservoir passes to be delivered into the toilet bowl, said passageway having at least one side opening into said reservoir and at least one other side opening into the toilet bowl; at least one cover regulating the passage of water through said passageway and having an open position at which the transfer of water from the reservoir into the toilet bowl is enabled and a closed position at which the transfer of water from the reservoir into the toilet bowl is prevented; at least one triggering member, which regulates the open/closed position of the cover, enables the cover to assume the open position for the delivery of the water within the reservoir into the toilet bowl and is able to be triggered mechanically, in a touch-operated manner or in a non-contact manner; at least one reference electrode in said reservoir, said reference electrode being positioned in a way to be on the same level as the minimum water level desired to be present within the reservoir, having a first conductivity value when the water within the reservoir is not in contact with the same and having a second conductivity value different from the first conductivity value when the water within the reservoir is in contact with the same; at least one measurement electrode positioned into the reservoir in such a way that it is located in an upper part of said reference electrode and that it corresponds to a predetermined water level, different from the minimum level, within the reservoir, said measurement electrode being equivalent to said reference electrode such that it has said first conductivity value when the water within the reservoir is not in contact with the same and it has said second conductivity value when the water within the reservoir is in contact with the same; at least one control unit connected with the reference electrode and the measurement electrode, said control unit keeping the recorded water level information that corresponds to the position of the reference electrode and the measurement electrode within the reservoir and the first conductivity value, checking and determining the conductivity values of the reference electrode and the measurement electrode at the predetermined periods and comparing the determined conductivity value to the first conductivity value, determining that the adequate quantity of water is not available within the reservoir in case the determined conductivity value for the reference electrode and the measurement electrode is the same as the first conductivity value, comparing the determined conductivity values for the reference electrode and the measurement electrode in case the determined conductivity value for the reference electrode is different from the first conductivity value, and accordingly, determining the level of water within the reservoir, identifying the quantity of water available within the reservoir according to the determined water level and the reservoir dimensions, and controlling and regulating the operation of the flushing system; and at least one control panel, which is connected to the control unit and which comprises at least indicator for informing the user about the quantity of water available within the reservoir based on the water level and/or water quantity determined by the control unit and thus, informing the user about the operational status of the flushing system. Owing to the electronically controlled flushing system developed according to the present invention, the water level within the reservoir may be continuously determined at certain periods and informed to the user in a precise manner. Thus, particularly in the wall- embedded flushing systems, the user may be aware of the quantity of water available within the reservoir and accordingly, the user may be provided with information regarding whether or not the flushing system is operational. As a result, it becomes possible to enhance the level of hygiene in an inexpensive, simple and practical manner especially in the public toilets. Object of the Invention

An object of the present invention is to devise a flushing system, which is controlled in an automated and/or digitalized manner.

Another object of the present invention is to devise an electronically controlled flushing system, which determines and notifies to a user the quantity of water available within the reservoir said system contains.

Another object of the present invention is to devise an electronically controlled flushing system where it is possible to precisely control the quantity of water to be delivered into a toilet bowl.

Another object of the present invention is to devise an electronically controlled flushing system for achieving a higher level of hygiene in a toilet in an inexpensive, simple and practical manner.

Description of the Figures

The representative embodiments of the flushing system developed according to the present invention are shown in the accompanying drawings in which: Figure 1 is a perspective view of the flushing system developed.

Figure 2 is an exemplary illustration of a control panel that the developed flushing system comprises. Figure 3 is a sectional perspective view of an embodiment of the developed flushing system. Figure 4 is a sectional view of another embodiment of the developed flushing system. The parts in the figures are individually assigned with reference numerals and the designations for the reference numerals are provided below:

Flushing system (F)

Reservoir (H)

Bottom (H1 )

Passageway (H2)

Cover (H3)

Control panel (K)

Indicator (K1 )

Water (S)

Control unit (U)

Reference electrode (E1 )

Measurement electrode (E2)

Description of the Invention

The flushing systems used for cleaning the toilet bowls comprise the equipment that enable different quantities of water to be delivered into a toilet bowl in order to reduce the water consumption. However, such equipment are usually mechanically controlled; hence the quantity of water delivered into a toilet bowl may not be controlled precisely. Moreover, in the flushing systems (particularly in the embedded flushing systems), it is not possible to easily detect the operational status of the flushing system or whether adequate quantity of water is available within the flushing system, which in turn could result in the failure to clean a toilet bowl after the use of the same. For this reason, an electronically controlled flushing system is developed according to the present invention with a view to provide a solution to the aforesaid problems.

The electronically controlled flushing system (F), exemplary views of which are provided in Figures 1 -4, is suitable for use in the delivery of water into a toilet bowl particularly for the purpose of cleaning said toilet bowl wherein said flushing system comprises at least one reservoir (H) with at least one bottom (H1 ) where the water (S) obtained from a source (such as a municipal water distribution network or a storage tank) is stored; at least one passageway (H2) through which the water (S) within the reservoir (H) passes to be delivered into the toilet bowl, said passageway having at least one side opening into said reservoir (H) and at least one other side opening into the toilet bowl; at least one cover (H3) regulating the passage of water through said passageway (H2) and having an open position at which the transfer of water from the reservoir (H) into the toilet bowl is enabled and a closed position at which the transfer of water from the reservoir (H) into the toilet bowl is prevented; and at least one triggering member, which regulates the open/closed position of the cover (H3), enables the cover (H3) to assume the open position for the delivery of the water (S) within the reservoir (H) into the toilet bowl (and/or enables said cover (H3) to assume the closed position preferably once the water (S) received from the source has begun to refill the reservoir (H) following the transfer of the desired quantity of water (S) from the reservoir (H) into said bowl) and is able to be triggered mechanically, in a touch-operated manner or in a non-contact manner. The developed flushing system (F) further comprises at least one reference electrode (E1 ) in said reservoir (H), said reference electrode being positioned in a way to be on the same level as the minimum water level desired to be present within the reservoir (H), having a first conductivity value when the water within the reservoir (H) is not in contact with the same and having a second conductivity value different from the first conductivity value when the water within the reservoir (H) is in contact with the same (said reference electrode (E1 ) being preferably positioned within the reservoir (H) in a region where a side wall of the reservoir (H) joins the bottom (H1 ) of the reservoir (H)) ; at least one measurement electrode (E2) positioned into the reservoir (H) in such a way that it is located in an upper part of said reference electrode (E1 ) and that it corresponds to a predetermined water level, different from the minimum level, within the reservoir (H), said measurement electrode being equivalent to said reference electrode (E1 ) such that it has said first conductivity value when the water within the reservoir (H) is not in contact with the same and it has said second conductivity value when the water within the reservoir (H) is in contact with the same; at least one control unit (U) connected preferably via a cable connection with the reference electrode (E1 ) and the measurement electrode (E2), said control unit keeping the recorded water level information that corresponds to the position of the reference electrode (E1 ) and the measurement electrode (E2) within the reservoir (H) and the first conductivity value, checking and determining the conductivity values of the reference electrode (E1 ) and the measurement electrode (E2) at the predetermined periods, preferably in an instant manner, and comparing the determined conductivity value to the first conductivity value, determining that the adequate quantity of water is not available within the reservoir (H) in case the determined conductivity value for the reference electrode (E1 ) and the measurement electrode (E2) is the same as the first conductivity value, comparing the determined conductivity values for the reference electrode (E1 ) and the measurement electrode (E2) in case the determined conductivity value for the reference electrode (E1 ) is different from the first conductivity value, and accordingly, determining the level of water within the reservoir (H), identifying the quantity of water available within the reservoir (H) according to the determined water level and the reservoir (H) dimensions, and controlling and regulating the operation of the flushing system (F); and at least one control panel (K), which is connected to the control unit (U) and which comprises at least one indicator (K1 ) for informing the user about the quantity of water available within the reservoir (H) based on the water level and/or water quantity determined by the control unit (U) and thus, informing the user about the operational status of the flushing system (F) and which preferably has the triggering member positioned therein. Said flushing system (F) is preferably a system disposed inside a wall in an area where the toilet bowl is present (i.e. it is a wall-embedded system).

According to an exemplary manner of operation of the invention, said cover (H3) is in the closed position at which the delivery of water (S) from the reservoir (H) into the toilet bowl is prevented and the reservoir (H) is in a state filled with the water (S) received from the source. In this case, the control unit (U) applies a low level of voltage (having a value of 20 volts, for example) into the reservoir (H) and measures in this way the conductivity values of the electrodes. Since the reservoir (H) is full with water (S), the water (S) contacts both the reference electrode (E1 ) and the measurement electrode (E2). In this case, the control unit (U) obtains the second conductivity value from both electrodes and, as this value is different from the first conductivity value (as the conductivity values for both the reference electrode (E1 ) and the measurement electrode (E2) are the same as one another), the information that the reservoir (H) is full and contains adequate quantity of water (S) is notified to the user by means of said indicator (K1 ). Since it is determined within this period that the water (S) within the reservoir (H) is at the level of the measurement electrode (E2), the height of the water (S) within the reservoir (H) and preferably the quantity of water (S) dependent on the dimensions of the reservoir (H) are determined by means of the control unit (U). When the user brings said cover (H3) into the open position by means of said triggering member, the water (S) within the reservoir (H) passes through said passageway (H2) and is delivered into the toilet bowl. In the meantime, the level of water (S) within the reservoir (H) drops and the control unit (U) detects that the conductivity values for the reference electrode (E1 ) and the measurement electrode (E2) are different from one another. When the conductivity value of the reference electrode (E1 ) is equal to the first conductivity value, the control unit (U) determines that the water (S) within the reservoir (H) has been transferred into the toilet bowl and enables said cover (H3) to assume its closed position. After the cover (H3) has assumed its closed position, the intake of water from the source into the reservoir (H) is carried out and the control unit (U) continues to perform the measurement of conductivity. When the conductivity values for the reference electrode (E1 ) and the measurement electrode (E2) are identical to each other and are different from the first conductivity value, the information that the reservoir (H) has become filled with the adequate quantity of water is detected and the intake of water from the source is interrupted by means of the control unit (U). When the conductivity values for the reference electrode (E1 ) and the measurement electrode (E2) are different from one another for a predetermined duration, the information that the adequate quantity of water is not available within the reservoir (H) and thus a problem is present in the flushing system (F) is notified to the user again by means of said indicator (K1 ). According to a representative embodiment, such notification of the proper operation status or problem status to the user may be provided by means of said indicator (K1 ) informing the user about the water level within the reservoir (H) according to certain value ranges. In this embodiment, for example at least one illuminating member is employed and the part up to the value that corresponds to the water (S) level (or quantity) within the reservoir (H) is shown in a certain color (e.g. green). In another embodiment, an illuminating member that emits light in different colors for different water levels is used, wherein it may be provided, for example, that the illuminating member disposed on the indicator (K1 ) emits the light in red color in case the water level within the reservoir (H) is low, whereas said illuminating member emits the light in green color in case the water level within the reservoir (H) is normal. In this way, the user may easily determine, prior to using the toilet, whether or not the flushing system (F) is properly functioning and whether or not an adequate quantity of water is available within the reservoir (H) and it may be ensured that a higher level of hygiene is achieved in an inexpensive, simple and practical manner particularly in the public toilets. According to a preferred embodiment of the invention, the developed flushing system (F) comprises at least two measurement electrodes (E2) inside the reservoir (H), said measurement electrodes being positioned in an upper part of the reference electrode (E1 ) in such a way that each corresponds to a different water (S) level. In this embodiment, while the water (S) level within the reservoir (H) is being detected by means of the control unit (U), first whether the conductivity value of the reference electrode (E1 ) is equal to the first conductivity value is checked. In case the conductivity value of the reference electrode (E1 ) is different from the first conductivity value, the conductivity values for the measurement electrodes (E2) are checked and the level, which corresponds to the position of the measurement electrode (E2) having the same conductivity value as the reference electrode (E1 ), is determined as the water (S) level within the reservoir (H) and notified to the user. In this manner, it may be made possible for the user to monitor the water (S) level within the reservoir (H) and to easily determine whether an adequate quantity of water (S) is available within the reservoir (H) depending on his/her need. According to a preferred embodiment of the invention, the developed flushing system (F) comprises at least one motion member (e.g. a motor) for providing the open/closed position of said cover (H3). In an embodiment, said motion member is preferably associated with the triggering member wherein when the triggering member is actuated by a user, the cover (H3) may assume the open position (and/or preferably the closed position). In another representative embodiment, said motion member is preferably associated with the control unit (U) wherein said member controls the movement of the cover (H3) into the open position (and/or preferably the closed position) according to the water level (and/or quantity) determined in the control unit (U). In another preferred embodiment, said motion member is connected to both the triggering member and the control unit (U). For example, when a user actuates the triggering member to enable the transfer of water (S) from the reservoir (H) into the toilet bowl, he/she activates the motion member at the same time and the motion member in turn enables the cover (H3) to assume the open position. Meanwhile, the level of water (S) transferred from the reservoir (H) into the toilet bowl is monitored by means of the control unit (U) based on the determined conductivity values, and, once the transfer of water (S) (preferably in a quantity that suits the need) has been complete, the control unit (U) activates the motion member and the motion member in turn enables the cover (H3) to assume the closed position. In this way, the opening and closing of the cover (H3) are controlled electronically in an automated manner and it is possible to precisely monitor the level and/or quantity of the water (S) within the reservoir (H).

According to another representative embodiment of the invention, the flushing system (F) features the ability to enable the cleaning of the toilet bowl to be performed with at least two quantities of water that are different from one another, and to achieve this purpose, said system comprises at least two triggering members and at least two measurement electrodes (E2) each corresponding to a separate quantity in order to enable the transfer of different quantities of water (S) into the toilet bowl. In this embodiment, the different water quantities to be used in cleaning the toilet bowl are recorded in the control unit (U) in a way corresponding to separate triggering members and measurement electrodes (E2). When a user actuates a triggering member that is appropriate for his/her need, the conductivity value of the measurement electrode (E2) corresponding to the level dependent on such quantity is monitored by means of the control unit (U) in order to transfer the water (S) in a quantity corresponding to that triggering member into the toilet bowl and when the conductivity value of said measurement electrode (E2) is different from the conductivity value of the reference electrode (E1 ), it is determined that the desired quantity of water (S) has been transferred into the toilet bowl and in this case, the cover (H3) is enabled to assume the closed position preferably via a motion member and the transfer of water (S) from the reservoir (H) into the toilet bowl is enabled to stop. In this way, the delivery of a desired quantity of water into the toilet bowl may be realized more precisely in a way that suits the actual need, and as a result, the consumption of water may be reduced even further. According to another preferred embodiment of the invention, the closing action of said cover (H3) may be achieved by means of the triggering member. For example, in case a user reaches, during the delivery of the water into the toilet bowl, the conclusion that the adequate quantity of water has been delivered into the toilet bowl, he/she actuates the triggering member again, and in this way, the user may enable the cover (H3) to assume the closed position preferably via a motion member, thereby interrupting the delivery of water from the reservoir (H) into the toilet bowl. Afterwards, the intake of water from the source to the reservoir (H) is restarted and the reservoir (H) is enabled to be refilled with water (S). Meanwhile, preferably the state of the rise in the level of water is presented to the user at predetermined periods (e.g. instantly) via said indicator (K1 ).

According to another representative embodiment of the invention, the flushing system (F) developed further comprises at least one audible warning member for warning the user about the operating status. Thus, it may be ensured that the flushing system (F) is used more efficiently by the user.

Owing to the electronically controlled flushing system (F) developed according to the present invention, the water level within the reservoir (H) may be continuously determined at certain periods and informed to the user in a precise manner. Thus, particularly in the wall- embedded flushing systems (F), the user may be aware of the quantity of water (S) available within the reservoir (H) and accordingly, the user may also be provided with information regarding whether or not the flushing system (F) is operational. As a result, it becomes possible to enhance the level of hygiene in an inexpensive, simple and practical manner especially in the public toilets.

Claims

1. A flushing system (F) suitable for use in the delivery of water into a toilet bowl particularly for the purpose of cleaning said toilet bowl, comprising · at least one reservoir (H) with at least one bottom (H1 ) where the water (S) obtained from a source is stored;

• at least one passageway (H2) through which the water (S) within the reservoir (H) passes to be delivered into the toilet bowl, said passageway having at least one side opening into said reservoir (H) and at least one other side opening into the toilet bowl;

• at least one cover (H3) regulating the passage of water through said passageway (H2) and having an open position at which the transfer of water from the reservoir (H) into the toilet bowl is enabled and a closed position at which the transfer of water from the reservoir (H) into the toilet bowl is prevented; and

· at least one triggering member, which regulates the open/closed position of the cover (H3), enables the cover (H3) to assume the open position for the delivery of the water (S) within the reservoir (H) into the toilet bowl and is able to be triggered mechanically, in a touch-operated manner or in a non-contact manner characterized in that it comprises

- at least one reference electrode (E1 ) in said reservoir (H), said reference electrode being positioned in a way to be on the same level as the minimum water level desired to be present within the reservoir (H), having a first conductivity value when the water within the reservoir (H) is not in contact with the same and having a second conductivity value different from the first conductivity value when the water within the reservoir (H) is in contact with the same;

- at least one measurement electrode (E2) positioned into the reservoir (H) in such a way that it is located in an upper part of said reference electrode (E1 ) and that it corresponds to a predetermined water level, different from the minimum level, within the reservoir (H), said measurement electrode being equivalent to said reference electrode (E1 ) such that it has said first conductivity value when the water within the reservoir (H) is not in contact with the same and it has said second conductivity value when the water within the reservoir (H) is in contact with the same;

- at least one control unit (U) connected with the reference electrode (E1 ) and the measurement electrode (E2), said control unit keeping the recorded water level information that corresponds to the position of the reference electrode (E1 ) and the measurement electrode (E2) within the reservoir (H) and the first conductivity value, checking and determining the conductivity values of the reference electrode (E1 ) and the measurement electrode (E2) at the predetermined periods and comparing the determined conductivity value to the first conductivity value, determining that the adequate quantity of water is not available within the reservoir (H) in case the determined conductivity value for the reference electrode (E1 ) and the measurement electrode (E2) is the same as the first conductivity value, comparing the determined conductivity values for the reference electrode (E1 ) and the measurement electrode (E2) in case the determined conductivity value for the reference electrode (E1 ) is different from the first conductivity value, and accordingly, determining the level of water within the reservoir (H), identifying the quantity of water available within the reservoir (H) according to the determined water level and the reservoir (H) dimensions, and controlling and regulating the operation of the flushing system (F); and

- at least one control panel (K), which is connected to the control unit (U) and which comprises at least one indicator (K1 ) for informing the user about the quantity of water available within the reservoir (H) based on the water level and/or water quantity determined by the control unit (U) and thus, informing the user about the operational status of the flushing system (F).

2. A flushing system (F) according to Claim 1 characterized in that said flushing system (F) is a system disposed inside a wall in an area where the toilet bowl is present.

3. A flushing system (F) according to Claim 1 characterized in that the reference electrode (E1 ) is positioned within the reservoir (H) in a region where a side wall of the reservoir (H) joins the bottom (H1 ) of the reservoir.

4. A flushing system (F) according to Claim 1 characterized in that said triggering member is a member enabling said cover (H3) to assume the closed position once the water (S) received from the source has begun to refill the reservoir (H) following the transfer of the desired quantity of water (S) from the reservoir (H) into the toilet bowl.

5. A flushing system (F) according to Claim 1 characterized in that said triggering member is positioned on the control panel (K).

6. A flushing system (F) according to Claim 1 characterized in that said indicator (K1 ) is an indicator, which informs the user about the proper operation status or problem status of the flushing system (F) by way of showing the water level within the reservoir (H) according to certain value ranges.

7. A flushing system (F) according to Claim 6 characterized in that it comprises at least one illuminating member positioned on the indicator (K1 ).

8. A flushing system (F) according to Claim 7 characterized in that said illuminating member is an illuminating member that emits light in different colors for different water levels.

9. A flushing system (F) according to Claim 1 characterized in that it comprises at least two measurement electrodes (E2) inside the reservoir (H), said measurement electrodes being positioned in an upper part of the reference electrode (E1 ) in such a way that each corresponds to a different water (S) level.

10. A flushing system (F) according to Claim 1 characterized in that it comprises at least one motion member for providing the open/closed position of said cover (H3).

11. A flushing system (F) according to Claim 10 characterized in that said motion member is a motor.

12. A flushing system (F) according to Claim 1 1 characterized in that said motion member is connected with said triggering member such that the cover (H3) may assume the open position and/or closed position when the triggering member is actuated by a user.

13. A flushing system (F) according to Claim 1 1 characterized in that said motion member is connected with the control unit (U) in a way to control the movement of the cover (H3) into the open position and/or closed position according to the water level determined in the control unit (U).

14. A flushing system (F) according to Claim 1 1 characterized in that said motion member is connected to both the triggering member and the control unit (U).

15. A flushing system (F) according to Claim 1 characterized in that it features the ability to enable the cleaning of the toilet bowl to be performed with at least two quantities of water that are different from one another.

16. A flushing system (F) according to Claim 15 characterized in that it comprises at least two triggering members and at least two measurement electrodes (E2) each corresponding to a separate quantity in order to enable the transfer of different quantities of water (S) into the toilet bowl.

17. A flushing system (F) according to Claim 16 characterized in that the control unit (U) contains the information about the water quantities corresponding to different triggering members and measurement electrodes (E2).

18. A flushing system (F) according to Claim 1 characterized in that it comprises at least one audible warning member for warning the user about the operating status.