Electric toothbrush and replacement head thereof

Abstract

The utility model discloses an electric toothbrush and a replacement head thereof, the replacement head of the electric toothbrush comprises: a brush body, the upper part of which is provided with a bristle member and the lower part of which is provided with an assembly cavity; the bottom plug is accommodated in the assembly cavity; the bottom plug comprises a side wall and a top wall, a containing groove is defined by the side wall and the top wall, and the containing groove is used for containing a power output shaft of the electric toothbrush in a matched mode; the side wall comprises an elastic part, and the elastic part extends in the axis direction of the assembling cavity and comprises a first side wall facing the containing groove and a second side wall backing on to the containing groove; the elastic part is provided with a cambered surface groove, the cambered surface groove is formed in the mode that the second side wall of the elastic part sinks towards the first side wall of the elastic part, and at least part of the groove edge of the cambered surface groove abuts against the inner wall of the assembling cavity. The replacement head of the electric toothbrush is stable in structure, and the using effect of the electric toothbrush is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, and in particular to a novel electric toothbrush and its replacement head. Background Technology

[0002] Electric toothbrushes, as a personal care device in the field of oral health, are increasingly favored by consumers. Electric toothbrushes typically have removable and replaceable attachment brushes, also known as "replacement heads." When replacement is needed after a period of use, only the brush head needs to be replaced, and the electric toothbrush itself can continue to be used.

[0003] When using an electric toothbrush, the protruding drive shaft on the handle inserts into the tubular connector of the replacement head. The high-speed rotating drive shaft drives the replacement head to clean the mouth. Electric toothbrushes are widely used due to their high efficiency, portability, and excellent cleaning effect.

[0004] However, the internal structure of existing electric toothbrush heads is unstable, resulting in poor performance of electric toothbrushes. Utility Model Content

[0005] The main purpose of this utility model is to provide an electric toothbrush and its replacement head that have a stable structure and improve the performance of electric toothbrushes.

[0006] To achieve the above objectives, this utility model proposes an electric toothbrush replacement head, comprising:

[0007] The brush body has brush bristles on the upper part and an assembly cavity on the lower part;

[0008] A bottom plug is housed within the assembly cavity; the bottom plug includes a side wall and a top wall, which together form a receiving groove for accommodating the power output shaft of an electric toothbrush; the side wall includes an elastic portion extending along the axial direction of the assembly cavity, including a first side wall facing the receiving groove and a second side wall facing away from the receiving groove; the elastic portion is provided with an arcuate groove, which is formed by the second side wall of the elastic portion being recessed towards the first side wall of the elastic portion, and the groove edge of the arcuate groove at least partially abuts against the inner wall of the assembly cavity.

[0009] Optionally, the bottom plug sidewall is provided with an opening, and the two ends of the elastic part extending along the axis of the assembly cavity are connected to the opposite sidewalls of the opening.

[0010] Optionally, the opening is covered with soft rubber.

[0011] Optionally, the length of the elastic part along the axis of the assembly cavity is L1, the length of the arc groove along the axis of the assembly cavity is L2, and the maximum depth of the arc groove is H; the value range of L1 is 5mm-10mm, the value range of L2 is 3mm-8mm, and the value range of H is 0.3mm-1.6mm.

[0012] Optionally, the inner bottom wall of the arc-shaped groove is provided with an opening groove, and the opening groove is filled with an elastic material.

[0013] Optionally, the groove edge of the arcuate groove is connected to a transition portion, which extends from the arcuate groove to the side wall of the bottom plug.

[0014] Optionally, the second sidewall of the elastic part is further provided with a protrusion extending toward the inner wall of the assembly cavity. The protrusion is located on at least one side of the arcuate groove, and the protrusion abuts against the inner wall of the assembly cavity, so that the force between the inner wall of the assembly cavity and the elastic part is concentrated on the protrusion.

[0015] Optionally, the protrusion includes a first protrusion and a second protrusion, the first protrusion being located on the side of the arcuate groove near the top wall of the bottom plug, and the second protrusion being located on the side of the arcuate groove away from the top wall of the bottom plug;

[0016] Wherein, the distance between the outer side of the first protrusion and the axis of the receiving groove is less than the distance between the outer side of the second protrusion and the axis of the receiving groove.

[0017] Optionally, the first sidewall of the elastic part is provided with a serrated engagement portion adapted to the outer wall surface of the power output shaft.

[0018] Optionally, the bottom plug further includes at least one first fixing part circumferentially disposed on the outer side wall of the bottom plug, and the inner side wall of the assembly cavity is provided with a second fixing part that cooperates with the first fixing part; and / or, the bottom plug further includes a shaped protrusion located on the top wall, the shaped protrusion abutting against the inner wall of the assembly cavity.

[0019] Optionally, the bottom plug further includes a positioning rib, which protrudes from the outer side of the sidewall and has a positioning groove that mates with the positioning rib on the inner side of the assembly cavity. The positioning rib is located on the opposite side of the elastic part; and / or, the bottom plug includes a support rib, which protrudes from the outer side of the sidewall and is located at the lower part of the bottom plug.

[0020] Optionally, the bottom of the bottom plug is further provided with a base, which is located inside the assembly cavity; or the base is located outside the assembly cavity, and the top surface of the base abuts against the bottom surface of the assembly cavity.

[0021] This utility model also provides an electric toothbrush, including a main unit and a brush head; a power output shaft protrudes from the upper end of the main unit; the brush head is a replacement head structure of any of the above embodiments; the power output shaft is adapted to be housed in the bottom plug of the brush head and drives the brush head to move.

[0022] The beneficial technical effects of this invention are as follows: When the power output shaft is inserted into the bottom plug, the outer wall of the power output shaft and the elastic part are compressed. At this time, the groove edge of the arc-shaped groove abuts against the inner wall of the assembly cavity, and the inner wall of the assembly cavity exerts a reverse force on the elastic part, thereby achieving the compression of the power output shaft by the elastic part. Through the mutual compression between the bottom plug and the power output shaft, the power output shaft can be stably connected to the brush body, thereby improving the performance of the electric toothbrush. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the electric toothbrush of this utility model;

[0025] Figure 2 This is an exploded structural diagram of an embodiment of the electric toothbrush replacement head of this utility model;

[0026] Figure 3 This is a cross-sectional structural diagram of an embodiment of the electric toothbrush replacement head of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of an embodiment of the bottom plug of the electric toothbrush replacement head of the present invention.

[0028] Figure 5 A cross-sectional structural schematic diagram of another embodiment of the bottom plug of the electric toothbrush replacement head of this utility model;

[0029] Figure 6 This is a schematic diagram of another embodiment of the bottom plug of the electric toothbrush replacement head of this utility model;

[0030] Figure 7 This is a schematic diagram of another embodiment of the bottom plug of the electric toothbrush replacement head of this utility model;

[0031] Figure 8 for Figure 4 A structural diagram of the midsole plug from another angle;

[0032] Figure 9This is a cross-sectional structural diagram of an embodiment of the electric toothbrush replacement head of this utility model;

[0033] Figure 10 This is an exploded structural diagram of another embodiment of the electric toothbrush replacement head of this utility model;

[0034] Figure 11 This is a cross-sectional structural diagram of another embodiment of the electric toothbrush replacement head of this utility model.

[0035] To better illustrate the toothbrush replacement head structure, some of the structures in the accompanying drawings have been enlarged.

[0036] Explanation of icon numbers:

[0037] Brush head -100;

[0038] Brush body-10; Assembly cavity-101; Brush bristle component-11; Positioning groove-12; Second fixing part-13;

[0039] Bottom plug-20; Receiving groove-201; Limiting surface-2011; Side wall-21; Top wall-22; Elastic part-23; Arc groove-231; Opening groove-2311; Transition part-233; Serrated engagement part-234; First side wall-235; Second side wall-236; Protrusion-237; First protrusion-237a; Second protrusion-237b; Opening-24; Soft rubber block-241; Strip hole-2411; Protrusion-242; Positioning rib-25; Support rib-26; Irregular protrusion-27; First fixing part-28; Base-29;

[0040] Main unit - 300; Power take-off shaft - 301; Flat surface - 3011.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0046] This utility model discloses an electric toothbrush, and more particularly, a replacement head for the electric toothbrush. (See reference...) Figure 1 as well as Figure 2 The electric toothbrush includes a brush head 100, a main unit 300, and a motor assembly, control circuit, power supply, and other structures (not shown in the figure) located within the main unit 300. The brush head 100 is detachably connected to the main unit 300 for easy brush head replacement. A power output shaft 301 protrudes from the end of the main unit 300 and is inserted into the brush head 100, mounting the brush head 100 onto the main unit 300. When the motor assembly is operating, the power output shaft 301 transmits power to the brush head 100, thereby driving the brush head 100 to rotate or vibrate, achieving efficient oral cleaning.

[0047] Combined with reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In one embodiment of this utility model, the replacement head of the electric toothbrush, namely the aforementioned brush head 100, includes a brush body 10 and a bottom plug 20 inserted into the lower part of the brush body 10. The bottom plug 20 serves as a connector, allowing the power output shaft 301 of the main unit 300 to be inserted, thereby connecting the main unit 300 and the brush head 100.

[0048] The brush body 10 is tubular and includes a first end and a second end. The first end is provided with a bristle 11, which cleans the oral cavity. The second end of the brush body 10 is provided with an opening, which extends toward the first end to form an assembly cavity 101. The bottom plug 20 is inserted into the assembly cavity 101 and engages with it.

[0049] The bottom plug 20 has a cylindrical structure, including a side wall 21 and a top wall 22. The side wall 21 is adapted to the inner wall of the assembly cavity 101 so that the bottom plug 20 can be better accommodated in the assembly cavity 101. The side wall 21 and the top wall 22 enclose a receiving groove 201, which is used to accommodate the power output shaft 301 of the electric toothbrush. The side wall 21 includes an elastic portion 23; the elastic portion 23 extends along the axial direction of the assembly cavity 101 and includes a first side wall 235 facing the receiving groove 201 and a second side wall 236 facing away from the receiving groove 201. The elastic portion 23 is provided with an arcuate groove 231, which is formed by the second side wall 236 of the elastic portion 23 recessed towards the first side wall 235 of the elastic portion 23, and the groove edge of the arcuate groove 231 at least partially abuts against the inner wall of the assembly cavity 101.

[0050] When the power output shaft 301 is inserted into the bottom plug 20, it enters the bottom plug 20 along the side wall 21. When the outer wall of the power output shaft 301 contacts the inner wall of the elastic part 23, it is squeezed against the elastic part 23. At this time, the arc groove 231 undergoes elastic deformation, causing the groove edge of the arc groove 231 to abut against the inner wall of the assembly cavity 101. The inner wall of the assembly cavity 101 exerts a reverse force on the elastic part 23, thereby squeezing the power output shaft 301. Through the mutual squeezing between the bottom plug 20 and the power output shaft 301, the power output shaft 301 can be stably connected to the brush body 10, thereby improving the performance of the electric toothbrush.

[0051] Furthermore, referring to Figure 1 , Figure 3 and Figure 9 The free end of the power output shaft 301 has two opposing sides, one of which is a flat surface 3011, and the other side is also a flat surface. The inner wall of the receiving groove 202 of the bottom plug 20 has a limiting surface 2011 arranged along its length direction. The limiting surface 2011 is configured to abut against the flat surface 3011 of the power output shaft 301, restricting relative movement of the power output shaft 301 in the circumferential direction within the bottom plug 20. In addition, by having the limiting surface 2011 and the elastic part 23 located on opposite sides of the power output shaft 301, the force exerted by the elastic part 23 on the power output shaft 301 is perpendicular to the surface of the limiting surface 2011, making the fit between the flat surface 3011 of the power output shaft 301 and the limiting surface 2011 more tight.

[0052] In one embodiment, reference is made to Figure 4 An opening 24 is provided on the side wall 21 of the brush body, and the two ends of the elastic part 23 extending along the axial direction of the assembly cavity 12 are connected to the opposite side walls of the opening 24. The opening 24 not only facilitates the forming of the elastic part 23, but also makes the deformation of the elastic part 23 more convenient.

[0053] In one embodiment, reference is made to Figure 4 The bottom wall of the arc-shaped groove 231 is provided with an opening groove 2311, and the opening groove 2311 is filled with elastic material. This design allows the elastic part 23 filled with elastic material to have better elasticity, which not only improves the stability of the connection between the elastic part 23 and the power output shaft, but also extends the service life of the bottom plug 20.

[0054] In one embodiment, reference is made to Figure 3 and 4 At least one end of the arcuate groove 231 is connected to a transition portion 233, which extends from the arcuate groove 231 toward the side wall of the bottom plug 20. When the elastic portion 23 deforms, the transition portion 233 can abut against the inner wall of the assembly cavity 101. Compared to the abutment of the arcuate groove 231's groove edge, this increases the contact area, thereby increasing the reaction force of the inner wall of the assembly cavity 101, improving the stability of the connection between the elastic portion 23 and the power output shaft, and extending the service life of the bottom plug 20. Furthermore, the transition portion 233 is sloped, making the groove edge of the arcuate groove 231 flared, thereby enhancing the deformation of the elastic portion 23.

[0055] In another embodiment, refer to Figure 5 The second sidewall 236 of the elastic part 23 also includes a protrusion 237 extending along the second sidewall of the elastic part toward the inner wall of the assembly cavity 101. The protrusion 237 is located on at least one side of the arcuate groove 231. The protrusion 237 abuts against the inner wall of the assembly cavity 101 so that the force between the inner wall of the assembly cavity 101 and the elastic part 23 is concentrated on the protrusion.

[0056] Further, the protrusion 237 includes a first protrusion 237a and a second protrusion 237b. The first protrusion 237a is located on the side of the arcuate groove 231 near the top wall of the bottom plug 20, and the second protrusion 237b is located on the side of the arcuate groove 231 away from the top wall of the bottom plug 20. The distance between the outer side of the first protrusion 237a and the axis P1 of the receiving groove 201 is less than the distance between the outer side of the second protrusion 237b and the axis P1 of the receiving groove 201. Figure 5As shown, two reference lines extend from the second protrusion 237b. Reference line L3 is parallel to the axis P1 of the receiving groove 201, and reference line L4 is the line connecting the outer side of the second protrusion 237b and the outer side of the first protrusion 237a. Thus, the outer walls of the first protrusion 237a and the second protrusion 237b together form a slope. Correspondingly, the inner wall of the assembly cavity 101 is provided with an inclined inner wall that mates with the aforementioned slope. When the brush body 10 is assembled with the bottom plug 20, the fit between the slope and the inclined inner wall allows for a tighter fit between the first protrusion 237a, the second protrusion 237b, and the assembly cavity 101. In addition, the fit between the slope and the inclined inner wall facilitates the assembly of the bottom plug 20 and the brush body 10.

[0057] In one embodiment, reference is made to Figure 5 The inner wall of the elastic part 23 is provided with a serrated engagement part 234 that is adapted to the outer wall surface of the power output shaft. The serrated engagement part 234 is provided to cooperate with the main unit having a strip-shaped transverse groove on the outer wall of the power output shaft. When the brush head with the serrated engagement part 234 is installed on the main unit having a groove on the outer wall of the power output shaft, the serrated engagement part 234 and the transverse groove on the power output shaft of the main unit engage with each other, thereby making the connection between the brush head and the power output shaft of the main unit more stable.

[0058] In one embodiment, reference is made to Figure 6 The opening 24 is covered with soft rubber. After the bottom plug 20 is injection molded, the bottom plug 20 is injection molded again to form a soft rubber block 241. The soft rubber block 241 has a strip-shaped hole 2411 that mates with the elastic part 23. The missing part around the elastic part 23 is filled with the soft rubber block 241 to make the outer wall of the bottom plug 20 more complete, thereby making the connection between the bottom plug 20 and the brush body 10 more stable. Furthermore, the sidewall of the opening 24 and / or both sides of the elastic part 23 are also provided with protrusions 242. The protrusions 242 increase the contact area between the opening 24 and the soft rubber block 241, increase the friction, and thus improve the stability of the connection between the opening 24 and the soft rubber block 241.

[0059] In one embodiment, reference is made to Figure 7 The elastic part 23 has a length L1 along the axis of the assembly cavity 101, the arc groove 231 has a length L2 along the axis of the assembly cavity 101, and the maximum depth of the arc groove 231 is H. The value range of L1 is 5mm-10mm, the value range of L2 is 3mm-8mm, and the value range of H is 0.3mm-1.6mm. L1, L2, and H can be set according to actual applications. For example, L1 is 6mm, L2 is 4mm, and H is 0.7mm; or L1 is 8mm, L2 is 6mm, and H is 1.2mm.

[0060] In one embodiment, reference is made to Figure 3 and Figure 4 The bottom plug 20 also includes an irregularly shaped protrusion 27 located on the top wall, such as... Figure 3 The cross-shaped structure shown in the diagram has the irregularly shaped protrusion 27 abutting against the inner wall of the assembly cavity. This design of the irregularly shaped protrusion 27 minimizes the adverse effects of thermal expansion and contraction on the product during production. This is because, in terms of manufacturing processes, achieving a tight fit between a solid columnar structure and the cavity wall is relatively difficult. The workpiece deforms during cooling, and the magnitude of this deformation affects the fit between the workpieces. Furthermore, solid structures require longer cooling times, resulting in greater deformation variations. In contrast, the irregularly shaped structure has multiple notches, lower thickness in each part, facilitates heat dissipation, and requires shorter cooling times, resulting in relatively smaller deformation variations. Therefore, the manufacturing process for achieving a tight fit between the outer wall of the irregularly shaped bottom plug and the inner wall of the brush body assembly cavity is relatively easier.

[0061] In one embodiment, reference is made to Figure 4 The bottom plug 20 further includes at least one first fixing part 28 circumferentially disposed on the outer side of the side wall, and a second fixing part 13 that cooperates with the first fixing part 28 is provided on the inner side of the assembly cavity 101. The first fixing part 28 and the second fixing part 13 may be an annular groove and the other an annular protrusion; or one may be an annular protrusion or groove structure and the other may be a corresponding groove or protrusion structure.

[0062] Furthermore, the bottom plug 20 also includes a support rib 26, which protrudes from the outer side of the sidewall and is located at the lower part of the bottom plug 20. Multiple support ribs 26 can be provided to enhance the overall strength of the bottom plug 20.

[0063] Furthermore, referring to Figure 8 and 9 The bottom plug 20 also includes a positioning rib 25, which protrudes from the outer side of the side wall. The inner side of the assembly cavity 101 is provided with a positioning groove 12 that mates with the positioning rib 25. The positioning rib 25 is located on the opposite side of the elastic part 23. By setting the positioning rib 25, the bottom plug 20 can be correctly installed on the brush body 10.

[0064] In one embodiment, reference is made to Figure 3 and Figure 4 The bottom of the bottom plug 20 is further provided with a base 29, which is located inside the assembly cavity 101. In another embodiment, refer to... Figure 10 and Figure 11 The base 29 is located outside the assembly cavity 101, and the upper side of the base 29 abuts against the bottom surface of the assembly cavity 101.

[0065] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A replacement head for an electric toothbrush, characterized in that, include: The brush body has brush bristles on the upper part and an assembly cavity on the lower part; A bottom plug is housed within the assembly cavity; the bottom plug includes a side wall and a top wall, which together form a receiving groove for accommodating the power output shaft of an electric toothbrush; the side wall includes an elastic portion extending along the axial direction of the assembly cavity, including a first side wall facing the receiving groove and a second side wall facing away from the receiving groove; the elastic portion is provided with an arcuate groove, which is formed by the second side wall of the elastic portion being recessed towards the first side wall of the elastic portion, and the groove edge of the arcuate groove at least partially abuts against the inner wall of the assembly cavity.

2. The electric toothbrush replacement head as described in claim 1, characterized in that, The bottom plug has an opening on its side wall, and the two ends of the elastic part extending along the axis of the assembly cavity are connected to the opposite side walls of the opening.

3. The electric toothbrush replacement head as described in claim 2, characterized in that, The opening is covered with soft rubber.

4. The electric toothbrush replacement head as described in claim 1, characterized in that, The length of the elastic part along the axis of the assembly cavity is L1, the length of the arc groove along the axis of the assembly cavity is L2, and the maximum depth of the arc groove is H; the value range of L1 is 5mm-10mm, the value range of L2 is 3mm-8mm, and the value range of H is 0.3mm-1.6mm.

5. The electric toothbrush replacement head as described in claim 1, characterized in that, The inner bottom wall of the arc-shaped groove is provided with an opening groove, and the opening groove is filled with an elastic material.

6. The electric toothbrush replacement head as described in claim 1, characterized in that, The groove edge of the arc-shaped groove is connected to a transition portion, which extends from the arc-shaped groove to the side wall of the bottom plug.

7. The electric toothbrush replacement head as described in claim 1, characterized in that, The second sidewall of the elastic part is further provided with a protrusion extending toward the inner wall of the assembly cavity. The protrusion is located on at least one side of the arcuate groove. The protrusion abuts against the inner wall of the assembly cavity so that the force between the inner wall of the assembly cavity and the elastic part is concentrated on the protrusion.

8. The electric toothbrush replacement head according to claim 7, characterized in that, The protrusion includes a first protrusion and a second protrusion. The first protrusion is located on the side of the arcuate groove near the top wall of the bottom plug, and the second protrusion is located on the side of the arcuate groove away from the top wall of the bottom plug. Wherein, the distance between the outer side of the first protrusion and the axis of the receiving groove is less than the distance between the outer side of the second protrusion and the axis of the receiving groove.

9. The electric toothbrush replacement head as described in claim 1, characterized in that, The first sidewall of the elastic part is provided with a serrated engagement part that is adapted to the outer wall surface of the power output shaft.

10. The electric toothbrush replacement head as described in claim 1, characterized in that, The bottom plug further includes at least one first fixing part circumferentially disposed on the outer side wall of the bottom plug, and the inner side wall of the assembly cavity is provided with a second fixing part that cooperates with the first fixing part; and / or, the bottom plug further includes a shaped protrusion located on the top wall, the shaped protrusion abutting against the inner wall of the assembly cavity.

11. The electric toothbrush replacement head as described in claim 10, characterized in that, The bottom plug further includes a positioning rib, which protrudes from the outer side of the sidewall and has a positioning groove that mates with the positioning rib on the inner side of the assembly cavity. The positioning rib is located on the opposite side of the elastic part; and / or, the bottom plug includes a support rib, which protrudes from the outer side of the sidewall and is located at the lower part of the bottom plug.

12. The electric toothbrush replacement head as described in any one of claims 1-11, characterized in that, The bottom of the bottom plug is also provided with a base, which is located inside the assembly cavity; or the base is located outside the assembly cavity, and the top surface of the base abuts against the bottom surface of the assembly cavity.

13. An electric toothbrush, characterized in that, The electric toothbrush includes a main unit and a brush head; a power output shaft protrudes from the upper end of the main unit; the brush head is an electric toothbrush replacement head as described in any one of claims 1-12; the power output shaft is adapted to be housed in the bottom plug of the brush head and drives the brush head to move.

Images