Brush head assembly and electric toothbrush

Abstract

The utility model discloses a brush head assembly and an electric toothbrush, the brush head assembly is connected to a brush handle assembly, the brush handle assembly comprises a driving shaft, the brush head assembly comprises a brush head rod, a connecting sleeve and a damping assembly, the driving shaft is in transmission connection with the brush head rod through the connecting sleeve, the brush head rod is provided with a connecting hole and an end joint surface, and the end joint surface intersects with the axial direction of the connecting hole; the connecting sleeve is provided with an inserting part and an end cover part, the inserting part is inserted into the connecting hole, and the end cover part covers the end connecting surface; the damping assembly comprises a first damping piece and a second damping piece, the first damping piece and the second damping piece are distributed in the axial direction of the connecting hole in a spaced mode, the first damping piece is arranged on the peripheral wall of the inserting part, and the second damping piece is arranged between the end connecting face and the end cover part. According to the electric toothbrush, the first damping part is arranged on the peripheral wall of the inserting part, and the second damping part is arranged between the end connecting surface and the end cover part, so that vibration between the connecting sleeve and the connecting hole is reduced, the noise of the electric toothbrush is reduced, and the experience feeling of a user is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of toothbrushes, and in particular to a brush head assembly and an electric toothbrush. Background Art

[0002] As people's living standards improve, they pay more and more attention to oral health. Electric toothbrushes have the advantages of strong cleaning ability, convenience and practicality, and can reduce damage to teeth or gums, and their popularity is growing. Electric toothbrushes use motors to provide driving power, drive the brush head to swing, and achieve teeth cleaning. However, during the operation of the motor, it generates large vibrations and noise, which reduces the user experience.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art and provides a brush head assembly and an electric toothbrush.

[0005] According to one aspect of the present application, the present application provides a brush head assembly connected to a brush handle assembly, the brush handle assembly comprising a drive shaft, the brush head assembly comprising a brush head rod, a connecting sleeve and a shock absorbing assembly, the drive shaft being transmission-connected to the brush head rod via the connecting sleeve, the brush head rod having a connecting hole and an end connection surface, the end connection surface intersecting with the axial direction of the connecting hole, the connecting sleeve having an insert portion and an end cover portion, the insert portion being inserted into the connecting hole, and the end cover portion being covered on the end connection surface; the shock absorbing assembly comprising a first shock absorbing member and a second shock absorbing member, the first shock absorbing member and the second shock absorbing member being spaced apart in the axial direction of the connecting hole, the first shock absorbing member being arranged on the outer peripheral wall of the insert portion, and the second shock absorbing member being arranged between the end connection surface and the end cover portion.

[0006] Furthermore, one of the hole wall of the connecting hole and the outer peripheral wall of the plug-in portion is provided with a first protrusion, and the other is provided with a first groove, and the first protrusion is embedded in the first groove to fix the relative position of the brush head rod and the connecting sleeve in the axial direction of the connecting hole.

[0007] Optionally, the second shock-absorbing member includes a mounting portion and a protruding portion, the mounting portion and the protruding portion are distributed along the circumference of the connecting hole, and the protruding portion is arranged to protrude relative to the mounting portion along the axial direction of the connecting hole.

[0008] Furthermore, there are multiple mounting parts, each of which is spaced apart along the circumference of the connecting hole, and two adjacent mounting parts are connected by the raised part, and the raised part surrounds a clearance groove, and the notch of the clearance groove faces the gap between the two adjacent mounting parts.

[0009] Furthermore, the driving shaft is inserted into the connecting sleeve, and the driving shaft and the connecting sleeve are connected via threads.

[0010] Furthermore, the shock absorbing assembly also includes a third shock absorbing member, and the third shock absorbing member is arranged between the driving shaft and the connecting sleeve.

[0011] Furthermore, the first shock absorbing member is a shock absorbing ring sleeved on the outer peripheral wall of the connecting sleeve, and the third shock absorbing member is a shock absorbing ring sleeved on the driving shaft.

[0012] Furthermore, in the direction from the first shock absorbing member to the second shock absorbing member, the cross-sectional area of ​​the connecting hole and the cross-sectional area of ​​the connecting sleeve both gradually increase.

[0013] Furthermore, one of the hole wall of the connecting hole and the outer peripheral wall of the plug-in portion is provided with a second protrusion, and the other is provided with a second groove, and the second protrusion is embedded in the second groove to fix the relative position of the brush head rod and the connecting sleeve in the circumferential direction of the connecting hole.

[0014] According to another aspect of the present application, there is provided an electric toothbrush, comprising a brush head assembly as described in any one of the above, the electric toothbrush further comprising a brush handle assembly, the brush handle assembly being transmission-connected to the brush head assembly via the drive shaft.

[0015] The beneficial effects of the present application are as follows: different from the prior art, the brush head assembly provided by the present application reduces the vibration between the connecting sleeve and the connecting hole by arranging a first shock-absorbing member on the outer peripheral wall of the plug-in part, and arranging a second shock-absorbing member between the terminal surface and the end cover part, thereby reducing the noise of the electric toothbrush and enhancing the user's experience. At the same time, the connecting sleeve is plugged into the brush head cover, and the brush handle assembly is connected to the connecting sleeve through the driving shaft, which is convenient for assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of an electric toothbrush provided in an embodiment of the present application.

[0018] Figure 2 It is an exploded view of an electric toothbrush provided in an embodiment of the present application.

[0019] Figure 3 It is a schematic diagram of a second shock-absorbing component provided in an embodiment of the present application.

[0020] Figure 4 yes Figure 1 sectional view of .

[0021] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0022] Figure 6 It is a partial cross-sectional view of an electric toothbrush provided in an embodiment of the present application.

[0023] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0024] In the figure:

[0025] 10. Brush head assembly; 11. Brush head rod; 111. Connecting hole; 112. Terminal surface; 12. Connecting sleeve; 121. Connecting portion; 122. End cover portion; 13. Shock absorbing assembly; 131. First shock absorbing member; 132. Second shock absorbing member; 1321. Mounting portion; 1322. Protruding portion; 1323. Displacement groove; 133. Third shock absorbing member;

[0026] 20. Brush handle assembly; 21. Drive shaft; 22. Thread;

[0027] 30. Axial limiting structure; 31. First protrusion; 32. First groove;

[0028] 40. Circumferential limiting structure; 41. Second protrusion; 42. Second groove. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The brush head assembly and the electric toothbrush in the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0032] In order to solve the technical problems of large vibration and high noise of electric toothbrushes in the prior art, an embodiment of the present application provides a brush head assembly connected to a brush handle assembly, the brush handle assembly includes a drive shaft, the brush head assembly includes a brush head rod, a connecting sleeve and a shock absorbing assembly, the drive shaft is connected to the brush head rod through the connecting sleeve, the brush head rod has a connecting hole and a terminal surface, the terminal surface intersects with the axial direction of the connecting hole, the connecting sleeve has a plug-in portion and an end cover portion, the plug-in portion is plugged into the connecting hole, and the end cover portion is covered on the terminal surface; the shock absorbing assembly includes a first shock absorbing member and a second shock absorbing member, the first shock absorbing member and the second shock absorbing member are spaced apart in the axial direction of the connecting hole, the first shock absorbing member is arranged on the outer peripheral wall of the plug-in portion, and the second shock absorbing member is arranged between the terminal surface and the end cover portion. The following is a detailed description.

[0033] See also Figure 1 In one embodiment, the electric toothbrush includes a brush head assembly 10 and a brush handle assembly 20. The brush handle assembly 20 includes a drive shaft 21, which is transmission-connected to the brush head assembly 10. Under the action of the drive shaft 21, the brush head assembly 10 vibrates to clean the teeth.

[0034] It should be noted that the drive shaft 21 may drive the brush head assembly 10 in the form of swing or other forms, in one driving mode, or in a switching of multiple driving modes, which will not be elaborated here, and the driving method and type are determined according to actual use.

[0035] Further, see Figure 2 and Figure 5 The brush head assembly 10 includes a brush head rod 11, a connecting sleeve 12 and a shock absorbing assembly 13. The brush head rod 11 has a connecting hole 111 and an end surface 112, and the end surface 112 is axially aligned with the connecting hole 111 (such as Figure 4The connecting sleeve 12 has a plug-in portion 121 and an end cover portion 122, the plug-in portion 121 is plugged into the connecting hole 111, and the end cover portion 122 is covered on the terminal surface 112, and is plugged into the connecting hole 111 through the plug-in portion 121 until the end cover portion 122 is covered on the terminal surface 112, so that it is easy to assemble; at the same time, the shock absorbing assembly 13 includes a first shock absorbing member 131 and a second shock absorbing member 132, and the first shock absorbing member 131 and the second shock absorbing member 132 are spaced apart in the axial direction of the connecting hole 111, and the spaced apart distribution can dampen the two ends of the connecting sleeve 12, thereby improving the damping effect, the first shock absorbing member 131 is arranged on the outer peripheral wall of the plug-in portion 121, and the second shock absorbing member 132 is arranged between the terminal surface 112 and the end cover portion 122.

[0036] It should be noted that the driving shaft 21 is drivably connected to the connecting sleeve 12, and the driving shaft 21 drives the connecting sleeve 12 to vibrate, thereby driving the brush head rod 11 to vibrate. By setting the first shock absorbing member 131 and the second shock absorbing member 132, the vibration between the connecting sleeve 12 and the brush head rod 11 can be effectively reduced, noise can be reduced, and the user experience can be improved. When in use, the driving shaft 21 drives the connecting sleeve 12 to vibrate. Since the outer peripheral wall of the plug-in portion 121 is provided with the first shock absorbing member 131, the connecting sleeve 12 is away from the driving shaft 2 1 and the hole wall of the connecting hole 111 are reduced, and the other end of the connecting sleeve 12 is provided with the second shock absorbing member 132 to reduce the vibration. The shock absorbing components 13 are provided at both ends of the connecting sleeve 12 to ensure that the vibration between the connecting sleeve 12 and the brush head rod 11 is reduced; and the axial direction of the terminal surface 112 and the connecting hole 111 are vertically arranged in the above embodiment, so that it is easy to process and assemble. In other embodiments, the axial direction of the terminal surface 112 and the connecting hole 111 can be non-vertical, for example, with the vertical direction ( Figure 4 Correspondingly, the end cover portion 122 of the connecting sleeve 12 also forms an angle of 45° with the vertical direction (not shown in the figure). When in use, the water flow between the brush head rod 11 and the connecting sleeve 12 can be discharged quickly and timely, thereby improving the sealing performance. This is not limited to this and will not be elaborated here.

[0037] See also Figure 6 and Figure 7In one embodiment, an axial limiting structure 30 is provided between the hole wall of the connecting hole 111 and the outer peripheral wall of the plug-in portion 121. The axial limiting structure 30 includes a first protrusion 31 and a first groove 32. The hole wall of the connecting hole 111 is provided with a first protrusion 31, and the outer peripheral wall of the plug-in portion 121 is provided with a first groove 32. The first protrusion 31 is embedded in the first groove 32 to fix the relative position of the brush head rod 11 and the connecting sleeve 12 in the axial direction of the connecting hole 111 (i.e. Figure 4 horizontal relative position in the viewing angle).

[0038] It should be noted that, in some embodiments, the first protrusion 31 and the first groove 32 can be interchangeably arranged. Specifically, the inner wall of the connecting hole 111 is provided with the first groove 32, and the outer peripheral wall of the plug-in portion 121 is provided with the first protrusion 31. At the same time, in order to facilitate the assembly of the first protrusion 31 and the first groove 32, in some embodiments, the portion of the first protrusion 31 contacting the first groove 32 is arranged in an arc shape (such as Figure 5 As shown), and in order to ensure the reliability of axial limitation, the above-mentioned first protrusion 31 forms a ring along the inner wall of the connecting hole 111. In some embodiments, it can also be a split setting, but it is not limited to this.

[0039] See also Figure 3 In one embodiment, the second shock absorber 132 includes a mounting portion 1321 and a protruding portion 1322, the mounting portion 1321 and the protruding portion 1322 are distributed along the circumference of the connecting hole 111, and the protruding portion 1322 is arranged to protrude axially relative to the mounting portion 1321 along the connecting hole 111, that is, the mounting portion 1321 abuts against the terminal surface 112, and the protruding portion 1322 abuts against the end cover portion 122; the protruding portion 1322 and the mounting portion 1321 are arranged in this way to increase the axial thickness of the second shock absorber 132. When the second shock absorber 132 is arranged between the terminal surface 112 and the end cover portion 122, it can ensure that the second shock absorber 132 is in full contact with the terminal surface 112 and the end cover portion 122, which is beneficial to reducing vibration.

[0040] It should be noted that, in some embodiments, the mounting portion 1321 may also abut against the end cover portion 122 , and the protruding portion 1322 may abut against the terminal surface 112 , which is selected according to actual assembly.

[0041] Please continue reading Figure 3In one embodiment, the above-mentioned mounting portions 1321 are provided with four, and each mounting portion 1321 is spaced apart along the circumference of the above-mentioned connecting hole 111, and two adjacent mounting portions 1321 are connected by the above-mentioned protruding portion 1322, and the protruding portion 1322 surrounds a clearance groove 1323, and the notch of the clearance groove 1323 faces the gap between the two adjacent mounting portions 1321; when the connecting hole 111 and the plug-in portion 121 are axially limited, in order to ensure smooth assembly, the above-mentioned first protrusion 31 and the upper There will be a gap between the first grooves 32 when the assembly is completed. At the same time, when the assembly is completed, the protrusion 1322 and the mounting portion 1321 will be squeezed, and the protrusion 1322 will be deformed toward the give way groove 1323. At the same time, a force acting on the end surface 112 or the end cover portion 122 will be generated (that is, the force generated by the protrusion 1322 for resetting). Under the action of this resetting force, the first protrusion 31 and the first groove 32 are fully abutted, and there is no gap between the two, which can effectively reduce vibration and reduce noise.

[0042] It should be noted that the number of the above-mentioned mounting portions 1321 can be two or more than two in other embodiments, depending on the circumferential size of the brush head rod 11. The setting of the above-mentioned paving groove 1323 provides space for the protrusion 1322 to deform, ensures that the protrusion 1322 is fully deformed, and provides reliable force to act on the terminal surface 112 or the end cover portion 122, thereby ensuring that the first protrusion 31 and the first groove 32 are fully abutted. At the same time, the setting of the paving groove 1323 does not require overcoming a large elastic force (the force generated by the deformation of the protrusion 1322) when the connecting sleeve 12 is inserted into the connecting hole 111, so that assembly can be achieved, which facilitates assembly. In other embodiments, the paving groove 1323 may not be set, and the protrusion 1322 can generate a force acting on the terminal surface 112 or the end cover portion 122, but is not limited to this.

[0043] Continue reading Figure 5 The drive shaft 21 is plugged into the connecting sleeve 12, and the drive shaft 21 and the connecting sleeve 12 are connected by a thread 22. At the same time, the shock absorbing assembly 13 also includes a third shock absorbing member 133, which is arranged between the drive shaft 21 and the connecting sleeve 12. The thread 22 is connected to ensure that the vibration between one end of the drive shaft 21 and the connecting sleeve 12 is reduced. At the same time, the third shock absorbing member 133 is used to dampen the non-threaded 22 section of the drive shaft 21 and the connecting sleeve 12, which is beneficial to reducing the vibration between the drive shaft 21 and the connecting sleeve 12. At the same time, the first shock absorbing member 131 and the second shock absorbing member 132 are arranged to reduce the vibration between the connecting sleeve 12 and the brush head cover, which can effectively reduce the overall vibration, reduce the noise during use, and improve the user's comfort.

[0044] It should be noted that, in some embodiments, the above-mentioned thread 22 can be a precision thread 22, which can be integrally formed with the connecting sleeve 12 or separately provided. There is no specific limitation here and it is determined according to the actual processing technology; and in some embodiments, the above-mentioned first shock-absorbing member 131 is a shock-absorbing ring sleeved on the outer peripheral wall of the above-mentioned connecting sleeve 12, and the above-mentioned third shock-absorbing member 133 is a shock-absorbing ring sleeved on the above-mentioned driving shaft 21, which is convenient for assembly and has a significant shock-absorbing effect. The contact surface between the shock-absorbing ring and the connecting hole 111 is arc-shaped, which is convenient for assembly. The shock-absorbing ring cooperates with the precision thread 22 to achieve multiple shock absorption.

[0045] Continue reading Figure 5 In the direction from the first shock absorber 131 to the second shock absorber 132, the cross-sectional area of ​​the connecting hole 111 and the cross-sectional area of ​​the connecting sleeve 12 are gradually increased. Such a configuration can facilitate the plug-in installation of the connecting sleeve 12 and the connecting hole 111.

[0046] It should be noted that the above cross section is a plane perpendicular to the axial direction of the connecting hole 111 .

[0047] Continue reading Figure 5 In one embodiment, a circumferential limiting structure 40 is provided between the hole wall of the above-mentioned connecting hole 111 and the outer peripheral wall of the above-mentioned plug-in portion 121, and the circumferential limiting structure 40 includes a second protrusion 41 and a second groove 42, the above-mentioned second protrusion 41 is arranged on the outer peripheral wall of the above-mentioned plug-in portion 121, the above-mentioned second groove 42 is arranged on the hole wall of the above-mentioned connecting hole 111, and the above-mentioned second protrusion 41 is embedded in the above-mentioned second groove 42 to fix the relative position of the above-mentioned brush head rod 11 and the above-mentioned connecting sleeve 12 in the circumferential direction of the above-mentioned connecting hole 111; in some embodiments, the positions of the above-mentioned second protrusion 41 and the above-mentioned second groove 42 can be interchanged, which will not be repeated here; in the present embodiment, the above-mentioned second protrusion 41 and the above-mentioned second groove 42 extend along the axial direction of the above-mentioned connecting hole 111, and can complete the fixation of the relative position of the brush head rod 11 and the above-mentioned connecting sleeve 12 in the circumferential direction of the connecting hole 111 when the connecting sleeve 12 is inserted into the above-mentioned connecting hole 111.

[0048] By arranging a first shock-absorbing member 131 on the outer peripheral wall of the plug-in portion 121 and arranging a second shock-absorbing member 132 between the terminal surface 112 and the end cover portion 122, the vibration between the connecting sleeve 12 and the connecting hole 111 is reduced, the noise of the electric toothbrush is reduced, and the user's experience is enhanced. At the same time, the connecting sleeve 12 is plugged into the brush head cover, and the brush handle assembly 20 is connected to the connecting sleeve 12 through the driving shaft 21, which is convenient for assembly.

[0049] In the various embodiments of the present application, if there is no special explanation and logical conflict, the terms or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships. In the present application, "at least one" means one or more, and "more" means two or more.

[0050] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

[0051] The brush head assembly and electric toothbrush provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the brush head assembly of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A brush head assembly connected to a brush handle assembly (20), wherein the brush handle assembly (20) comprises a drive shaft (21), characterized in that: The brush head assembly (10) comprises a brush head rod (11), a connecting sleeve (12) and a shock absorbing assembly (13); the driving shaft (21) is connected to the brush head rod (11) by transmission through the connecting sleeve (12); the brush head rod (11) has a connecting hole (111) and an end surface (112); the end surface (112) intersects with the axial direction of the connecting hole (111); the connecting sleeve (12) has a plug-in portion (121) and an end cover portion (122); the plug-in portion (121) is plugged into the connecting hole (111); and the end cover portion (122) is covered on the end surface (112); The shock absorbing assembly (13) comprises a first shock absorbing member (131) and a second shock absorbing member (132); the first shock absorbing member (131) and the second shock absorbing member (132) are spaced apart in the axial direction of the connecting hole (111); the first shock absorbing member (131) is arranged on the outer peripheral wall of the plug-in portion (121); and the second shock absorbing member (132) is arranged between the end surface (112) and the end cover portion (122).

2. The brush head assembly according to claim 1, characterized in that: One of the hole wall of the connecting hole (111) and the outer peripheral wall of the plug-in portion (121) is provided with a first protrusion (31), and the other is provided with a first groove (32); the first protrusion (31) is embedded in the first groove (32) to fix the relative positions of the brush head rod (11) and the connecting sleeve (12) in the axial direction of the connecting hole (111).

3. The brush head assembly according to claim 1, characterized in that: The second shock-absorbing member (132) comprises a mounting portion (1321) and a protruding portion (1322); the mounting portion (1321) and the protruding portion (1322) are distributed along the circumference of the connecting hole (111); and the protruding portion (1322) is arranged to protrude relative to the mounting portion (1321) along the axial direction of the connecting hole (111).

4. The brush head assembly according to claim 3, characterized in that: There are a plurality of mounting portions (1321), each of which is spaced apart along the circumference of the connecting hole (111), and two adjacent mounting portions (1321) are connected via the protruding portion (1322), the protruding portion (1322) surrounds a clearance groove (1323), and the notch of the clearance groove (1323) faces the gap between the two adjacent mounting portions (1321).

5. The brush head assembly according to claim 1, characterized in that: The driving shaft (21) is inserted into the connecting sleeve (12), and the driving shaft (21) and the connecting sleeve (12) are connected via a thread (22).

6. The brush head assembly according to claim 5, characterized in that: The shock absorbing assembly (13) further comprises a third shock absorbing member (133), wherein the third shock absorbing member (133) is arranged between the driving shaft (21) and the connecting sleeve (12).

7. The brush head assembly according to claim 6, characterized in that: The first shock absorbing member (131) is a shock absorbing ring sleeved on the outer peripheral wall of the connecting sleeve (12), and the third shock absorbing member (133) is a shock absorbing ring sleeved on the driving shaft (21).

8. The brush head assembly according to claim 1, wherein: In the direction from the first shock absorbing member (131) to the second shock absorbing member (132), the cross-sectional area of ​​the connecting hole (111) and the cross-sectional area of ​​the connecting sleeve (12) both gradually increase.

9. The brush head assembly according to claim 1, characterized in that: One of the hole wall of the connecting hole (111) and the outer peripheral wall of the plug-in portion (121) is provided with a second protrusion (41), and the other is provided with a second groove (42); the second protrusion (41) is embedded in the second groove (42) to fix the relative positions of the brush head rod (11) and the connecting sleeve (12) in the circumferential direction of the connecting hole (111).

10. An electric toothbrush, characterized in that: The electric toothbrush comprises a brush head assembly as claimed in any one of claims 1 to 9, and further comprises a brush handle assembly (20), wherein the brush handle assembly (20) is transmission-connected to the brush head assembly (10) via the drive shaft (21).

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