CN212547234U - Shock-absorbing structure, handle and electric toothbrush - Google Patents

Abstract

The application discloses shock-absorbing structure, handle and electric toothbrush. The damping structure comprises a power shaft, a damping piece connected with the power shaft and a shaft rod connected with one end of the damping piece far away from the power shaft; the coincidence length of the shock-absorbing piece and the shaft lever is larger than that of the shock-absorbing piece and the power shaft. Vibrations that the brush head during operation of electric toothbrush produced, when transmitting to the motor through axostylus axostyle, damper and power axle, apparent reduction, the casing of electric toothbrush's handle is difficult for being strikeed to producing great vibrations by the motor, and user's hand numb feeling is showing and is reducing or even disappearance.

Description

Shock-absorbing structure, handle and electric toothbrush

Technical Field

The application relates to the field of electric toothbrushes, in particular to a damping structure, a handle and an electric toothbrush.

Background

When the electric toothbrush works, the motor drives the brush head to rotate or vibrate, and then the teeth are cleaned. In order to improve the cleaning force of the electric toothbrush, the rotating frequency of the motor needs to be adjusted, but the handle body is easy to vibrate violently, and the use experience of the electric toothbrush is reduced.

In the related art, the chinese utility model patent with publication number CN207613904U discloses a sound wave electric toothbrush, which uses a vibrator motor as an acting point, and transmits the swing of the motor with the center of the circle to a replacement rod through a connecting elastic sheet and a damping fixing sheet, and the toothbrush head tightly fitted on the replacement rod realizes the swing together therewith, so as to solve the problem that the handle body of the electric toothbrush shakes violently. But its shock attenuation effect is general, and when the motor rotated at the high frequency, the handle fuselage still had great vibrations.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a shock-absorbing structure, aim at solving prior art, electric toothbrush's handle fuselage vibrations problem violent.

To achieve the purpose, the embodiment of the application adopts the following technical scheme:

the damping structure comprises a power shaft, a damping piece connected with the power shaft and a shaft rod connected with one end of the damping piece, which is far away from the power shaft; the coincidence length of the shock-absorbing piece and the shaft lever is larger than that of the shock-absorbing piece and the power shaft.

In one embodiment, the shock absorber has a first connection to the shaft and a second connection to the power shaft; the length of the first connecting portion is greater than that of the second connecting portion.

In one embodiment, the shock absorbing member is provided with a yielding notch, and the yielding notch is located between the first connecting portion and the second connecting portion.

In one embodiment, the first connecting portion is a U-shaped member, and the first connecting portion is wound around the outside of the shaft.

In one embodiment, the shock-absorbing structure further includes a first connection member, and the first connection portion is connected to the shaft by the first connection member.

In one embodiment, the first connection portion is threadedly connected with the first connection assembly; or the first connecting part is clamped with the first connecting assembly.

In one embodiment, when the first connection part is screwed with the first connection assembly, the first connection assembly includes a first connection member fixedly connected with the shaft, a second connection member disposed opposite to the first connection member, and a first screw connected between the first connection member and the second connection member.

In one embodiment, the shock-absorbing structure further comprises a second connecting assembly, and the second connecting portion is connected with the power shaft through the second connecting assembly.

In one embodiment, the second connecting portion is threadedly connected with the second connection assembly; or the second connecting part is clamped with the second connecting component.

In one embodiment, when the second connecting part is threadedly connected with the second connecting assembly, the second connecting assembly includes a third connecting member, a fourth connecting member opposite to the third connecting member, and a second screw connected between the third connecting member and the fourth connecting member.

It is another object of the present application to provide a handle comprising a housing, a motor, and the shock absorbing structure described in any of the above embodiments; the motor is fixedly arranged on the inner wall of the shell, the power shaft is an output shaft of the motor, and the shaft rod extends out of the shell.

It is a further object of the present application to provide an electric toothbrush comprising a head and a handle as in the previous embodiments; the brush head is mounted on the shaft.

The beneficial effects of the embodiment of the application are as follows: and enabling the coincidence length of the shock absorption piece and the shaft lever to be larger than that of the shock absorption piece and the power shaft. Vibrations that the brush head during operation of electric toothbrush produced, when transmitting to the motor through axostylus axostyle, damper and power axle, apparent reduction, the casing of electric toothbrush's handle is difficult for being strikeed to producing great vibrations by the motor, and user's hand numb feeling is showing and is reducing or even disappearance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural view of a shock absorbing structure (when a brush head is installed) in an embodiment of the present application;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is an exploded view of the shock absorbing structure of FIG. 1;

FIG. 4 is a schematic structural view of the shock absorbing member of FIG. 3;

FIG. 5 is a schematic view of the construction of an electric toothbrush in an embodiment of the present application;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a waveform diagram of vibration generated when the shock-absorbing structure operates;

in the figure:

1. a motor; 101. a power shaft; 1011. a contact plane;

2. a shock absorbing member; 201. a first connection portion; 202. a second connecting portion; 203. a abdication gap; 204. a second abdicating hole; 205. a third abdicating hole;

3. a shaft lever; 301. a first abdicating hole;

4. a first connection assembly; 401. a first connecting member; 4011. a jack; 4012. a first threaded hole; 402. a second connecting member; 4021. a first connection hole; 403. a first screw;

5. a second connection assembly; 501. a third connecting member; 5011. a second threaded hole; 502. a fourth connecting member; 5021. a second connection hole; 503. a second screw;

6. a housing; 7. a brush head; 800. a handle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The inventor finds that even if a connecting elastic sheet is additionally arranged between the motor and a shaft rod (a replacing rod in the related art is used for being connected with a toothbrush head), most of unbalanced vibration generated in the swinging process of the toothbrush head can still be directly transmitted back to the motor when the motor works, so that the vibration is transmitted to the handle body through the motor, and a user can still feel numb feeling generated by large vibration when holding the handle body.

In order to solve the technical problem, the inventor finds out through a large number of experiments that the reason why the connecting elastic sheet does not effectively solve the vibration of the handle of the machine body is as follows: the opposite ends (the two ends in the length direction) of the connecting elastic sheet are connected with the power shaft of the motor and the shaft lever, the length of the connecting elastic sheet which is overlapped with the power shaft of the motor when being connected with the power shaft of the motor is equal to (or approaches to be equal to) the length of the connecting elastic sheet which is overlapped with the shaft lever when being connected with the shaft lever, namely the shaft lever and the power shaft of the motor are arranged at the opposite ends of the connecting elastic sheet in a symmetrical mode. This kind of mounting means has still guaranteed higher symmetry between the power shaft of axostylus axostyle and motor, and the unbalanced vibrations that toothbrush head swing in-process produced pass through the axostylus axostyle and connect the shell fragment and transmit to the motor, and motor and axostylus axostyle are the symmetry vibrations at the relative both ends of connecting the shell fragment in the transmission process for the vibrations difference at connection shell fragment both ends is little, and the vibrations majority that the toothbrush head produced still can directly transmit back to the motor.

The following detailed description of implementations of the present application is provided in conjunction with specific embodiments.

As shown in fig. 1 to 3, the present embodiment proposes a shock-absorbing structure including a power shaft 101 (the power shaft 101 may be an output shaft of a motor 1 in a handle 800 of an electric toothbrush), a shock-absorbing member 2 connected to the power shaft 101, and a shaft 3 connected to an end of the shock-absorbing member 2 remote from the power shaft 101. When shock-absorbing structure was applied to electric toothbrush, the essential part was installed in electric toothbrush's casing 6, and power axle 101 is motor 1's output shaft, and the one end that the axostylus axostyle 3 kept away from damper 2 links to each other with electric toothbrush's brush head 7. When the electric toothbrush works, the motor 1 works to enable the power shaft 101 to rotate, the shock absorption piece 2 rotates along with the power shaft 101 and drives the shaft lever 3 to rotate, and finally the brush head 7 connected with the shaft lever 3 is driven to swing (to reciprocate within a certain angle).

In order to reduce the transmission of the vibration generated when the brush head 7 swings back to the motor 1, the overlapping length of the damper 2 and the shaft 3 is larger than the overlapping length of the damper 2 and the power shaft 101. The overlap length is defined as: the length of the shaft lever 3 coinciding with the shock absorbing member 2 in the axial direction when the shaft lever 3 is connected with the shock absorbing member 2; the length of overlap of the axial direction of the power shaft 101 and the damper 2 when the power shaft 101 is connected to the damper 2.

In the embodiment of the application, the shaft lever 3 and the power shaft 101 are respectively connected to two opposite ends of the shock absorbing member 2, when the brush head 7 swings, the shaft lever 3 is driven to swing, and the overlapped part of the shock absorbing member 2 and the shaft lever 3 when being connected swings along with the shaft lever 3. Since the damper 2 itself has a movable elastic deformation capability, the damper 2 itself deforms when subjected to the swinging force of the shaft 3, and the deformation occurs mainly in a free portion (a region not overlapping with the power shaft 101 and the shaft 3) of the damper 2.

The overlapping length of the shock absorbing piece 2 and the shaft rod 3 is larger than that of the shock absorbing piece 2 and the power shaft 101; the most severely deformed portion of the damper 2 is located closer to the power shaft 101 than the middle portion of the damper 2, and the most severely deformed portion can be defined approximately as the oscillation midpoint. The length of the damping member 2 on the side close to the brush head 7 at the midpoint of oscillation is therefore greater than the length of the damping member 2 on the side away from the brush head 7 at the midpoint of oscillation.

Therefore, when the shock absorber 2 transmits a shock, the deflection amplitude of the end connected with the shaft rod 3 is larger, and the deflection amplitude of the end connected with the power shaft 101 is smaller (assuming that the swing midpoint is the fulcrum of the shock elastic sheet, the shock absorber 2 swings around the fulcrum, and under the condition of the same angle, the deflection amplitude of the end with the larger length is larger). Therefore, the vibration generated by the brush head 7 during operation is significantly reduced when the vibration is transmitted to the motor 1 through the shaft 3, the damper 2 and the power shaft 101. Therefore, even if the brush head 7 is swung at a high speed, the vibration transmitted to the motor 1 is not so large, and the housing 6 of the handle 800 of the electric toothbrush is not hit by the motor 1 to generate a large vibration, so that the hand numbness feeling of the user is significantly reduced.

Meanwhile, when the power shaft 101 of the motor 1 rotates and the brush head 7 is driven to rotate by the damping member 2 and the shaft 3, the deformation of the damping member 2 is the same as that when the brush head 7 transmits vibration to the motor 1. Therefore, the power shaft 101 of the motor 1 drives one end of the shock absorbing part 2 to form a smaller swing amplitude, namely the other end of the shock absorbing part 2 can be driven to form a larger swing amplitude, the swing speed of the brush head 7 is increased, and the cleaning force of the brush head 7 is further enhanced.

As shown in fig. 7, the waveform of the vibration generated by the operation of the shock absorbing structure provided by the present application is a sine wave due to the arrangement of the shock absorbing members 2 and the specific arrangement of the connection positions of the shock absorbing members with the power shaft 101 and the shaft 3. The sine wave can correct and reduce the self-generated vibration amplitude at any moment of vibration.

Alternatively, in the embodiment of the present application, the damping member 2 may be a spring, such as a steel spring.

Referring to fig. 4, as another embodiment of the damping structure provided in the present application, the damping member 2 has a first connecting portion 201 connected to the shaft 3 and a second connecting portion 202 connected to the power shaft 101; the length of the first connection portion 201 is greater than the length of the second connection portion 202.

Let a breach 203 for the position of bumper shock absorber 2 local fretwork, and let a breach 203 be located between first connecting portion 201 and the second connecting portion 202, when bumper shock absorber 2 deformation with let a breach 203 be the boundary department, first connecting portion 201 takes place separately with the second connecting portion 202 deflection deformation, because the length of first connecting portion 201 is greater than the length of second connecting portion 202, consequently the swing range of first connecting portion 201 is bigger, the one end swing range that also links to each other with axostylus axostyle 3 and brush head 7 is bigger. Therefore, the vibration generated by the swinging of the brush head 7 is obviously reduced in strength after being transmitted to the motor 1 through the shock absorbing member 2; the motor 1 can drive the brush head 7 to generate larger swing amplitude under the condition of the same rotating speed.

Meanwhile, the yielding notch 203 is partially hollowed out in the shock absorbing member 2, so that the yielding notch 203 has a certain deformation buffering space, most positions of the first connecting portion 201 cannot directly impact the second connecting portion 202 when the first connecting portion vibrates, and the first connecting portion 201 is further prevented from transmitting a large amount of vibration to the second connecting portion 202.

In the embodiment of the present application, a groove structure may be disposed on the shock absorbing member 2, the groove structure may be located between the first connecting portion 201 and the second connecting portion 202, the shock absorbing member 2 is deformed by taking the groove structure as a boundary, the first connecting portion 201 and the second connecting portion 202 are respectively deflected and deformed, and since the length of the first connecting portion 201 is greater than that of the second connecting portion 202, the swing amplitude of the first connecting portion 201 is greater, that is, the swing amplitude of the end connected to the shaft rod 3 and the brush head 7 is greater. Therefore, the vibration generated by the swinging of the brush head 7 is obviously reduced in strength after being transmitted to the motor 1 through the shock absorbing member 2; the motor 1 can drive the brush head 7 to generate larger swing amplitude under the condition of the same rotating speed.

Referring to fig. 1 to 3, as another embodiment of the shock absorbing structure provided by the present application, the first connecting portion 201 is a U-shaped member, and the first connecting portion 201 is wound around the shaft 3. When the first connecting portion 201 of damper 2 links to each other with axostylus axostyle 3, drive axostylus axostyle 3 and swing on the circular arc of certain angle, the first connecting portion 201 that the U type spare formed can drive the circular arc swing of doing that axostylus axostyle 3 is steady around the outside of locating axostylus axostyle 3, is difficult for skidding or not hard up.

In the embodiment of the present application, the structure of the first connection portion 201 is different from that of the second connection portion 202, so that the vibration frequency of the first connection portion 201 is different from that of the second connection portion 202, and the first connection portion 201 is less prone to transmit a large amount of vibration generated by the brush head 7 to the second connection portion 202, thereby effectively reducing the transmission of vibration generated by the brush head 7 to the motor 1. For example, when the first connecting portion 201 is a U-shaped member, the second connecting portion 202 may be a folded plate including a flat plate and vertical plates disposed at two ends of the flat plate, and the vertical plates are at a predetermined angle, for example, 90 degrees.

Referring to fig. 2-3, as another embodiment of the shock absorbing structure provided by the present application, the shock absorbing structure further includes a first connecting component 4, and the first connecting portion 201 is connected to the shaft 3 through the first connecting component 4.

Referring to fig. 2-3, as another embodiment of the damping structure provided by the present application, the first connecting portion 201 may be connected with the first connecting component 4 by a screw thread, a snap connection, or a mutual embedding manner.

When the first connection portion 201 is screwed with the first connection assembly 4, the first connection assembly 4 includes a first connection member 401 fixedly connected with the shaft 3, a second connection member 402 disposed opposite to the first connection member 401, and a first screw 403 connected between the first connection member 401 and the second connection member 402. Through the effect of the first screw 403, the threaded connection (indirect threaded connection) between the first connection portion 201 and the first connection assembly 4 is realized in other embodiments of the present application, and a screw thread that can be matched with the first connection portion 201 and the first connection assembly 4 may also be provided on the first connection portion 201 and the first connection assembly 4, so as to realize the direct threaded connection between the first connection portion and the first connection assembly.

Referring to fig. 3, as another specific embodiment of the shock absorbing structure provided by the present application, a jack 4011 is formed on the first connecting member 401, the shaft rod 3 is inserted into the jack 4011, an inner wall of the jack 4011 has a limiting plane, and a surface of the shaft rod 3 has another plane adapted to the limiting plane, so that the shaft rod 3 cannot rotate in the jack 4011 after being inserted into the jack 4011. The shaft rod 3 is provided with a first abdicating hole 301, the shock absorption piece 2 is provided with at least one second abdicating hole 204, the first connecting piece 401 is provided with a first threaded hole 4012 communicated with the jack 4011, and the second connecting piece 402 is provided with a first connecting hole 4021. The first screw 403 passes through the first connecting hole 4021, the second abdicating hole 204, the first threaded hole 4012 and the first abdicating hole 301 in sequence, so that after the first screw 403 is in threaded connection with the first threaded hole 4012 on the first connecting piece 401, the shaft rod 3 and the damping piece 2 are fixed between the first connecting piece 401 and the second connecting piece 402.

Referring to fig. 4, as another embodiment of the shock absorbing structure provided by the present application, the number of the second receding holes 204 is multiple, and the multiple second receding holes 204 are sequentially arranged along the length direction of the shock absorbing member 2. Therefore, the damping member 2 can be coupled to the shaft 3 through the different second relief holes 204 and the first screws 403, thereby changing the coupling length of the shaft 3 to the damping member 2.

Referring to fig. 2 to 3, as another specific embodiment of the damping structure provided by the present application, a second connecting assembly 5 is further included, and the second connecting portion 202 is connected to the power shaft 101 through the second connecting assembly 5.

Referring to fig. 2-3, as another embodiment of the damping structure provided by the present application, the second connecting portion 202 can be connected with the second connecting component 5 by a screw thread, a snap connection, or a mutual embedding manner.

Referring to fig. 2 to 3, as another embodiment of the shock absorbing structure provided by the present application, when the second connecting portion 202 is screwed with the second connecting member 5. The second connecting assembly 5 includes a third connecting member 501, a fourth connecting member 502 disposed opposite to the third connecting member 501, and a second screw 503 connected between the third connecting member 501 and the fourth connecting member 502, and further, the second connecting member 202 is in threaded connection (indirect threaded connection) with the second connecting assembly 5 by the action of the second screw 503. The power shaft 101 is compressed between the third connector 501 and the fourth connector 502. In other embodiments of the present application, matching threads may be provided on the second connection portion 202 and the second connection component 5 to achieve a direct threaded connection therebetween.

Referring to fig. 2-3, when the third connecting member 501 and the fourth connecting member 502 are fixedly connected, the power shaft 101 and the damping member 2 can be fixed between the third connecting member 501 and the fourth connecting member 502. The side of power shaft 101 has contact plane 1011, and bumper shock absorber 2 sets up with the contact plane 1011 laminating, and when power shaft 101 applied force to bumper shock absorber 2, contact plane 1011 can with the steady contact of bumper shock absorber 2, bumper shock absorber 2 is difficult for sliding.

Referring to fig. 3, as another embodiment of the shock absorbing structure provided by the present application, a plurality of second threaded holes 5011 are formed in the third connector 501, a plurality of third receding holes 205 corresponding to the plurality of second threaded holes 5011 one to one are formed in the shock absorbing member 2, and a second connecting hole 5021 corresponding to the plurality of second threaded holes 5011 one to one is formed in the fourth connector 502; the second connecting assembly 5 further includes a plurality of second screws 503 in one-to-one correspondence with the plurality of second screw holes 5011 and in threaded connection; the second screw 503 sequentially passes through the second connecting hole 5021, the third abdicating hole 205 and the second threaded hole 5011, and the second screw 503 is arranged on two opposite sides of the power shaft 101.

The present embodiment provides a handle 800, as shown in fig. 5-6, including a housing 6, a motor 1, and a shock-absorbing structure in any of the above embodiments; the motor 1 is fixedly arranged on the inner wall of the shell 6, the power shaft 101 is an output shaft of the motor 1, and the shaft lever 3 extends out of the shell 6.

When the handle 800 having the shock-absorbing structure of the above-described embodiment is applied to an electric toothbrush, the shock generated by the deflection of the brush head 7 is significantly reduced when it is transmitted to the motor 1 through the shaft 3, the shock-absorbing member 2 and the power shaft 101. Therefore, even if the brush head 7 is swung at a high speed, the vibration transmitted to the motor 1 is not so large, and the housing 6 of the handle 800 is not hit by the motor 1 to generate a large vibration, so that the hand numbness of the user is significantly reduced.

As shown in fig. 5-6, the present embodiment provides a power toothbrush, which includes a brush head 7 and a handle 800 in the above embodiment; the brush head 7 is mounted on the shaft 3 of the handle 800.

In the electric toothbrush (e.g., acoustic wave electric toothbrush) having the handle 800 of the above embodiment, the vibration generated by the deflection of the brush head 7 is significantly reduced when transmitted to the motor 1 through the shaft 3, the damper 2 and the power shaft 101, and the housing 6 of the handle 800 is not impacted by the motor 1 to generate a large vibration, so that the hand numbness of the user is significantly reduced.

It is to be understood that aspects of the present invention may be practiced otherwise than as specifically described.

It should be understood that the above examples are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims (12)

1. The damping structure is characterized by comprising a power shaft, a damping piece connected with the power shaft and a shaft rod connected with one end of the damping piece, which is far away from the power shaft; the coincidence length of the shock-absorbing piece and the shaft lever is larger than that of the shock-absorbing piece and the power shaft.

2. The shock absorbing structure of claim 1, wherein said shock absorbing member has a first connecting portion connected to said shaft and a second connecting portion connected to said power shaft; the length of the first connecting portion is greater than that of the second connecting portion.

3. The shock-absorbing structure of claim 2, wherein the shock-absorbing member has a relief notch, and the relief notch is located between the first connecting portion and the second connecting portion.

4. The shock-absorbing structure according to claim 2 or 3, wherein the first connecting portion is a U-shaped member, and the first connecting portion is wound around the outside of the shaft.

5. The shock-absorbing structure according to claim 2 or 3, further comprising a first connecting member through which the first connecting portion is connected to the shaft.

6. The shock absorbing structure according to claim 5, wherein the first connecting portion is screw-coupled with the first connecting member; or the first connecting part is clamped with the first connecting assembly.

7. The shock-absorbing structure according to claim 6, wherein when the first connecting portion is screw-coupled with the first connecting member, the first connecting member includes a first connecting member fixedly coupled with the shaft, a second connecting member disposed opposite to the first connecting member, and a first screw coupled between the first connecting member and the second connecting member.

8. The shock absorbing structure of claim 2 or 3 further comprising a second connecting assembly, said second connecting portion being connected to said power shaft by said second connecting assembly.

9. The shock absorbing structure according to claim 8, wherein the second connecting portion is screw-coupled with the second connecting member; or the second connecting part is clamped with the second connecting component.

10. The shock-absorbing structure according to claim 9, wherein when the second connecting portion is screw-coupled with the second coupling member, the second coupling member includes a third coupling member, a fourth coupling member opposite to the third coupling member, and a second screw coupled between the third coupling member and the fourth coupling member.

11. A handle comprising a housing, a motor, and the shock absorbing structure of any one of claims 1-10; the motor is fixedly arranged on the inner wall of the shell, the power shaft is an output shaft of the motor, and the shaft rod extends out of the shell.

12. An electric toothbrush comprising a head and a handle as claimed in claim 11; the brush head is mounted on the shaft.

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