Electric toothbrush

Abstract

The utility model discloses an electric toothbrush which comprises a brush head, a toothbrush body and a shaft sleeve, an output shaft is arranged at the top of the toothbrush body, and the shaft sleeve is provided with a shaft sleeve channel. The shaft sleeve is arranged on the top of the toothbrush body in the mode that the output shaft is kept in the shaft sleeve channel of the shaft sleeve in a vibratable mode, a gap is formed between the shaft sleeve and the output shaft, and the top of the shaft sleeve is lower than the top of the output shaft so that the top of the output shaft can be exposed. Wherein the brush head is detachably mounted at the top of the output shaft, so that the vibration amplitude of the shaft sleeve can be greatly reduced, and when a user uses the electric toothbrush to brush teeth, the teeth do not feel uncomfortable even if the teeth are in contact with the shaft sleeve.

Description

[0001] The present application is a divisional application of the patent application with the application number 2023232789754, the application date of December 1, 2023, and the utility model name of "Electric toothbrush and brush head". TECHNICAL FIELD

[0002] The utility model relates to a toothbrush, in particular to an electric toothbrush. BACKGROUND

[0003] In recent years, electric toothbrushes have become increasingly popular. In the Chinese utility model patent with the authorization announcement number CN218739216U, an electric toothbrush is disclosed, which includes a connecting shaft, a brush head, and a buckle assembly. The brush head is detachably connected to one end of the connecting shaft. The brush head includes a brush head main body and a brushing part. The brush head main body includes a head part and a rod part connected to the head part. In the axial direction of the rod part, the length of the rod part is less than or equal to the length of the head part, and the maximum width W1 of the cross section of the rod part is less than the maximum width W2 of the cross section of the head part. The brushing part is fixedly installed on the head part. The buckle assembly includes a spring buckle and a metal buckle sleeve sleeved on the periphery of the spring buckle. The spring buckle has a body part and a buckle part connected to the body part. The body part is provided with an empty space on the side of the buckle part away from the metal buckle sleeve. A deformation space is formed between the buckle part and the metal buckle sleeve. The brush head main body is injection molded and wrapped around the periphery of the metal buckle sleeve. The buckle assembly is at least partially located in the rod part. The end surface of the rod part away from the head part is provided with a plug-in hole corresponding to the spring buckle. The connecting shaft extends into the empty space of the body part through the plug-in hole and is connected to the buckle part. The defects of the prior art electric toothbrush are: first, the connecting shaft is directly exposed. Since the connecting shaft transmits power to the brush head through high-frequency vibration, when the user uses the electric toothbrush to brush teeth, if the connecting shaft touches the teeth, the high-frequency vibration of the connecting shaft will cause the connecting shaft to repeatedly collide with the teeth, which not only causes discomfort to the teeth but also damages the health of the teeth. Second, the structure of the buckle assembly of the prior art electric toothbrush is complex. It requires the configuration of the metal buckle sleeve, otherwise the deformation space cannot be formed between the spring buckle and the brush head main body, and the connection between the spring buckle and the connecting shaft cannot be achieved. UTILITY MODEL CONTENTS

[0004] The utility model discloses a purpose lies in providing a kind of electric toothbrush and brush head, wherein the electric toothbrush is with shaft sleeve set in the outside of output shaft, to hide the output shaft, avoid the output shaft direct contact user's teeth, since the output shaft is vibratablely kept in the shaft sleeve channel of the shaft sleeve, and the shaft sleeve and the output shaft have gap between, therefore the vibration of the shaft sleeve can be substantially reduced, so that when user uses the electric toothbrush of the utility model to brush teeth, even if tooth contacts the shaft sleeve, tooth also does not feel uncomfortable, to reach the purpose of protecting tooth.

[0005] The utility model discloses a purpose lies in providing a kind of electric toothbrush and brush head, wherein the electric toothbrush is with flexible waterproof ring sealingly set in the top of output shaft and sealingly connect the outer edge of waterproof ring on the top of shaft sleeve, by such mode, on the one hand, the waterproof ring can prevent water or the mixture of water and toothpaste from entering the shaft sleeve channel of the shaft sleeve, to improve the waterproofness and hygienic property of the electric toothbrush, on the other hand, the waterproof ring can absorb vibration, prevent the vibration generated by the output shaft from being transmitted to the shaft sleeve through the waterproof ring, to reduce the vibration of the shaft sleeve.

[0006] The utility model discloses a purpose lies in providing a kind of electric toothbrush and brush head, compared with prior art electric toothbrush, the brush head of the electric toothbrush of the utility model does not need to be equipped with metal buckle sleeve, just need to be equipped with fixed element and elastic element, this makes the electric toothbrush of the utility model structure more simple, to be favorable for reducing the cost of the electric toothbrush and improving the reliability of the electric toothbrush.

[0007] According to an aspect of the utility model, the utility model provides a kind of electric toothbrush, it includes:

[0008] Brush head;

[0009] Toothbrush body, wherein the top of the toothbrush body has output shaft;And

[0010] Shaft sleeve, wherein the shaft sleeve has shaft sleeve channel, the shaft sleeve is set on the top of the toothbrush body, the output shaft is vibratablely kept in the shaft sleeve channel of the shaft sleeve, the shaft sleeve and the output shaft have gap between, and the top of the shaft sleeve is lower than the top of the output shaft, to expose the top of the output shaft, wherein the brush head is detachably mounted on the top of the output shaft.

[0011] According to an embodiment of the utility model, the shaft sleeve is integrally extended upwards from the top of the shell of the toothbrush body, to set the shaft sleeve on the toothbrush body.

[0012] According to one embodiment of the present application, the electric toothbrush comprises a flexible waterproof ring, the waterproof ring has a ring body passage, the top of the output shaft passes through the ring body passage of the waterproof ring to sealingly sleeve the waterproof ring on the top of the output shaft, and the outer edge of the waterproof ring is sealingly connected to the top of the shaft sleeve.

[0013] According to one embodiment of the present application, the outer edge of the waterproof ring is bonded to the top of the shaft sleeve, or the waterproof ring is integrally formed on the top of the shaft sleeve through a rubber coating process.

[0014] According to one embodiment of the present application, the electric toothbrush comprises a cover body, the cover body has a cover body passage, the top of the output shaft passes through the cover body passage of the cover body to sleeve the cover body on the top of the output shaft, the cover body is fixedly connected to the top of the shaft sleeve, the outer edge of the waterproof ring is clamped between the cover body and the shaft sleeve.

[0015] According to one embodiment of the present application, the cover body has an annular cover body groove, the shaft sleeve has an annular shaft sleeve groove, the outer edge of the waterproof ring has a top boss and a bottom boss, the top boss of the waterproof ring protrudes into the cover body groove of the cover body, and the bottom boss of the waterproof ring protrudes into the shaft sleeve groove of the shaft sleeve.

[0016] According to one embodiment of the present application, the cover body is bonded to the top of the shaft sleeve, or the cover body is ultrasonically welded to the top of the shaft sleeve, or the cover body is clamped to the top of the shaft sleeve, or the cover body is screwed to the top of the shaft sleeve.

[0017] According to one embodiment of the utility model, the top of output shaft has the clamping groove, wherein the brush head includes head, the rod part which is integrally downward from the head and the clamping part which is arranged in the rod groove of the rod part, the clamping part includes fixed element and elastic element, the fixed element has the clamping through -hole of passing through the opposite ends of fixed element and the lateral passage which is communicated with the clamping through -hole, the elastic element has first extension arm and second extension arm, the first extension arm and the second extension arm are " V " shape extension, the end of first extension arm and the end of second extension arm are fixedly connected to the outer wall of fixed element, the connecting end of first extension arm and the connecting end of second extension arm extend to the clamping through -hole through the lateral passage of fixed element, wherein when the output shaft begins to insert the clamping through -hole of fixed element, the output shaft pushes the connecting end of first extension arm and the connecting end of second extension arm outward to make the elastic element produce elastic deformation and accumulate elastic potential energy, when the position of output shaft insertion corresponds to the position of the connecting end of first extension arm and the connecting end of second extension arm in the clamping groove, the elastic element begins to restore the initial state and allows the connecting end of first extension arm and the connecting end of second extension arm to protrude into the clamping groove of the output shaft, for installing the brush head on the top of output shaft.

[0018] According to one embodiment of the utility model, the end of first extension arm and the end of second extension arm of elastic element are clamped between the outer wall of fixed element and the inner wall of rod part to fixedly connect the end of first extension arm and the end of second extension arm to the outer wall of fixed element.

[0019] According to one embodiment of the utility model, the outer wall of fixed element has the accommodation groove, the accommodation groove is communicated with the lateral passage, the depth size of accommodation groove is equal to the size of the end of first extension arm and the end of second extension arm, and the end of first extension arm and the end of second extension arm are accommodated in the accommodation groove of fixed element.

[0020] According to another aspect of the utility model, the utility model further provides a brush head, which includes:

[0021] Head;

[0022] Rod part which is integrally downward from the head; and

[0023] A clamping portion of a rod slot of the rod portion, the clamping portion comprising a fixed element and an elastic element, the fixed element having a clamping through hole penetrating through opposite ends of the fixed element and a side channel communicated with the clamping through hole, the elastic element having a first extension arm and a second extension arm, the first extension arm and the second extension arm extending in a "V" shape, the end of the first extension arm and the end of the second extension arm being fixedly connected to the outer wall of the fixed element, the connecting end of the first extension arm and the connecting end of the second extension arm extending to the clamping through hole through the side channel of the fixed element.

[0024] According to an embodiment of the present application, the end of the first extension arm and the end of the second extension arm of the elastic element are clamped between the outer wall of the fixed element and the inner wall of the rod portion, so as to fixedly connect the end of the first extension arm and the end of the second extension arm to the outer wall of the fixed element.

[0025] According to an embodiment of the present application, the outer wall of the fixed element has a receiving groove, the receiving groove being communicated with the side channel, the depth size of the receiving groove being equal to the size of the end of the first extension arm and the end of the second extension arm, and the end of the first extension arm and the end of the second extension arm being received in the receiving groove of the fixed element.

[0026] According to another aspect of the present application, the present application further provides an electric toothbrush, which comprises:

[0027] A toothbrush body, wherein the top of the toothbrush body has an output shaft, and the top of the output shaft has a clamping slot; and

[0028] A brush head, wherein the brush head comprises a head, a stem portion integrally extending downward from the head, and a clamping portion provided in a stem slot of the stem portion, the clamping portion comprising a fixed element and an elastic element, the fixed element having a clamping through hole penetrating through opposite ends of the fixed element and a lateral passage communicated with the clamping through hole, the elastic element having a first extension arm and a second extension arm, the first extension arm and the second extension arm extending in a "V" shape, the ends of the first extension arm and the second extension arm being fixedly connected to an outer wall of the fixed element, the connecting ends of the first extension arm and the second extension arm extending to the clamping through hole through the lateral passage of the fixed element, wherein when the output shaft begins to be inserted into the clamping through hole of the fixed element, the output shaft pushes the connecting ends of the first extension arm and the second extension arm outward to make the elastic element elastically deform to accumulate elastic potential energy, when the output shaft is inserted to a position corresponding to the positions of the connecting ends of the first extension arm and the second extension arm, the elastic element begins to restore the initial state to allow the connecting ends of the first extension arm and the second extension arm to protrude into the clamping slot of the output shaft, so as to install the brush head on the top of the output shaft. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a perspective view of an electric toothbrush according to a preferred embodiment of the present application.

[0030] Figure 2 is a cross-sectional view of the electric toothbrush according to the preferred embodiment of the present application.

[0031] Figure 3 is a perspective view of a toothbrush body of the electric toothbrush according to the preferred embodiment of the present application.

[0032] Figure 4 is an exploded view of the toothbrush body of the electric toothbrush according to the preferred embodiment of the present application.

[0033] Figure 5 is a perspective view of a brush head of the electric toothbrush according to the preferred embodiment of the present application.

[0034] Figure 6 is an exploded view of the brush head of the electric toothbrush according to the preferred embodiment of the present application.

[0035] Figure 7 is a cross-sectional view of a process of installing the brush head of the electric toothbrush according to the preferred embodiment of the present application in a partial position of the toothbrush body.

[0036] Figure 8 This is a partial cross-sectional view of a second part of the process of installing the brush head of the electric toothbrush according to the above-described preferred embodiment of the present invention onto the toothbrush body.

[0037] Figure 9 This is a partial cross-sectional view of a third step in the process of mounting the brush head of the electric toothbrush according to the above-described preferred embodiment of the present invention onto the toothbrush body.

[0038] Figure 10 This is a cross-sectional schematic diagram of a modified example of the electric toothbrush according to the above-described preferred embodiment of the present invention.

[0039] Figure 11 This is a cross-sectional schematic diagram of another modified example of the electric toothbrush according to the above-described preferred embodiment of the present invention. Detailed Implementation

[0040] Before describing any embodiment of this invention in detail, it should be understood that the invention is not limited in its application to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising,” or “having,” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0041] Furthermore, firstly, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation on this utility model. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0042] Refer to the accompanying drawings of the specification of this utility model. Figures 1 to 9An electric toothbrush according to a preferred embodiment of the present invention will be disclosed and described in the following description, wherein the electric toothbrush includes a toothbrush body 10, a bushing 20 and a brush head 30.

[0043] Specifically, the toothbrush body 10 includes a shell 11, a motor assembly 12, a battery 13, a circuit board 14, a control switch 15, a bracket 16, and a charging port 17. The shell 11 has a housing space 111 and a top opening 112, a side opening 113, and a bottom opening 114 respectively communicating with the housing space 111. The motor assembly 12 includes a power section 121 and an output shaft 122 connected to the power section 121. The power section 121 is housed within the housing space 111 of the shell 11, and the output shaft 122 extends through the top opening 112 of the shell 11 to the outside of the shell 11. Both the battery 13 and the circuit board 14 are housed within the housing space 111 of the outer casing 11, and the battery 13 and the power unit 121 are respectively connected to the circuit board 14. A control switch 15 is located in the side opening 113 of the outer casing 11 and is connected to the circuit board 14, allowing the user to control the operating state of the power unit 121. A charging port 17 is located on the bracket 16 and is connected to the circuit board 14. The bracket 16 is located in the bottom opening 114 of the outer casing 11, allowing the user to charge the battery 13 through the charging port 17. In other words, the toothbrush body 10 has the output shaft 122.

[0044] The bushing 20 has a bushing channel 21. The bushing 20 is disposed on the top of the toothbrush body 10 such that the output shaft 122 is vibratoryly held in the bushing channel 21 of the bushing 20. There is a gap between the bushing 20 and the output shaft 122, and the top of the bushing 20 is lower than the top of the output shaft 122 so that the top of the output shaft 122 is exposed. In this way, the brush head 30 can be mounted on the top of the output shaft 122 of the toothbrush body 10. When the battery 13 supplies power to the power section 121 of the motor assembly 12 through the circuit board 14, the power section 121 can drive the output shaft 122 to generate high-frequency vibration, thereby driving the brush head 30 to generate high-frequency vibration to help the user brush their teeth. Since the bushing 20 is fitted outside the output shaft 122 and there is a gap between the bushing 20 and the output shaft 122, the vibration of the bushing 20 is greatly reduced. Therefore, when the user uses the electric toothbrush to brush their teeth, even if the bushing 20 comes into contact with the teeth, the teeth will not feel uncomfortable, thereby achieving the purpose of protecting the teeth.

[0045] Preferably, in the appendix Figures 1 to 9 In this specific example of the electric toothbrush of the present invention, the bushing 20 extends integrally upward from the top of the outer shell 11 of the toothbrush body 10 to be disposed on the toothbrush body 10. That is, the bushing 20 and the outer shell 11 are an integral structure. This not only helps to reduce the assembly cost of the electric toothbrush but also improves the sealing performance of the electric toothbrush, preventing water or a mixture of water and toothpaste from entering the housing space 111 of the outer shell 11.

[0046] Continue to refer to the appendix Figures 1 to 9 The electric toothbrush includes a flexible waterproof ring 40 with an annular channel 41. The top of the output shaft 122 passes through the annular channel 41 of the waterproof ring 40 to seal the top of the output shaft 122. The outer edge of the waterproof ring 40 is sealed to the top of the bushing 20. In this way, on the one hand, the waterproof ring 40 can prevent water or a mixture of water and toothpaste from entering the bushing channel 21 of the bushing 20, thereby improving the waterproofness and hygiene of the electric toothbrush. On the other hand, the waterproof ring 40 can absorb vibration and prevent the vibration generated by the output shaft 122 from being transmitted to the bushing 20 through the waterproof ring 40, thereby reducing the vibration of the bushing 20. This is crucial for protecting the dental health of users when using the electric toothbrush.

[0047] In the appendix Figures 1 to 9In this specific example of the electric toothbrush shown, the electric toothbrush further includes a cover 50 having a cover through-hole 51 through which the top of the output shaft 122 passes to fit the cover 50 onto the top of the output shaft 122. The cover 50 is fixedly connected to the top of the bushing 20, and the outer edge of the waterproof ring 40 is clamped between the cover 50 and the bushing 20 to sealably connect the outer edge of the waterproof ring 40 to the top of the bushing 20.

[0048] It is worth mentioning that the specific manner in which the cover 50 is fixedly connected to the top of the bushing 20 is not limited in this specific example of the electric toothbrush of this utility model. For example, in the appendix Figures 1 to 9 In this specific example of the electric toothbrush shown, the cover 50 and the bushing 20 are ultrasonically welded to securely connect the cover 50 and the bushing 20, thereby ensuring that the outer edge of the waterproof ring 40 is sealed to the top of the bushing 20. Optionally, in other specific examples of the electric toothbrush of this invention, the cover 50 may be glued to the top of the bushing 20, or the cover 50 may be snapped onto the top of the bushing 20, or the cover 50 may be screwed onto the top of the bushing 20.

[0049] Reference Appendix Figure 2 The cover 50 has an annular cover groove 52, and the bushing 20 has an annular bushing groove 22. The outer edge of the waterproof ring 40 has a top boss 42 and a bottom boss 43. The top boss 42 of the waterproof ring 40 protrudes into the cover groove 52 of the cover 50, and the bottom boss 43 of the waterproof ring 40 protrudes into the bushing groove 22 of the bushing 20. In this way, on the one hand, the outer edge of the waterproof ring 40 can be reliably clamped between the cover 50 and the bushing 20, preventing the outer edge of the waterproof ring 40 from falling off between the cover 50 and the bushing 20. On the other hand, the sealing performance of the joint of the cover 50, the waterproof ring 40 and the bushing 20 can be further increased.

[0050] Appendix Figure 10 A modified example of the electric toothbrush of this invention is shown, with reference to the appendix. Figures 1 to 9 The electric toothbrush shown differs from the one described above in that it has an attached... Figure 10 In this specific example of the electric toothbrush shown, the waterproof ring 40 is integrally formed onto the cover 50 via an overmolding process. The cover 50 is fixedly connected to the top of the bushing 20 such that the outer edge of the waterproof ring 40 is clamped between the cover 50 and the bushing 20, thus sealingly connecting the outer edge of the waterproof ring 40 to the top of the bushing 20. (See attached...)Figures 1 to 10 The electric toothbrush shown is the same as the one with attached Figure 7 In this specific example of the electric toothbrush shown, the cover 50 and the bushing 20 can be ultrasonically welded together.

[0051] Appendix Figure 11 A modified example of the electric toothbrush of this invention is shown, with reference to the appendix. Figures 1 to 9 The electric toothbrush shown differs from the one described above in that it has an attached... Figure 11 In this specific example of the electric toothbrush shown, the toothbrush may not have the cover 50 configured, and the waterproof ring 40 may be integrally formed on the top of the bushing 20 by an overmolding process to seal the outer edge of the waterproof ring 40 to the top of the bushing 20. Alternatively, in other examples of the electric toothbrush, the outer edge of the waterproof ring 40 and the top of the bushing 20 may be glued together.

[0052] Continue to refer to the appendix Figure 2 , Figures 5 to 9 The toothbrush body 10 has a snap-fit ​​groove 1221 at the top of the output shaft 122, so that the brush head 30 can be fixedly mounted on the top of the output shaft 122. Specifically, refer to the attached drawing. Figure 5 and Figure 6 The brush head 30 includes a head 31, a shaft 32, and a locking portion 33. The shaft 32 extends integrally downward from the head 31 and has a shaft groove 321. The locking portion 33 is disposed in the shaft groove 321 of the shaft 32. When the top of the output shaft 122 of the toothbrush body 10 is inserted into the locking portion 33 of the brush head 30, the locking portion 33 engages the locking groove 1221 of the output shaft 122, thereby fixing the brush head 30 to the top of the output shaft 122.

[0053] More specifically, the snap-fit ​​portion 33 includes a fixing element 331 and an elastic element 332, wherein the fixing element 331 has a snap-fit ​​through hole 3311 and a side channel 3312, the snap-fit ​​through hole 3311 extends through opposite ends of the fixing element 331, and the side channel 3312 communicates with the snap-fit ​​through hole 3311 on the side of the fixing element 331. The fixing element 331 is embedded in the rod groove 321 of the rod portion 32 to provide the snap-fit ​​portion 33 in the rod groove 321 of the rod portion 32. The elastic element 332 has a first extension arm 3321 and a second extension arm 3322, which extend in a “V” shape. The ends of the first extension arm 3321 and the second extension arm 3322 are fixedly connected to the outer wall of the fixing element 331. The connecting ends of the first extension arm 3321 and the second extension arm 3322 extend through the side channel 3312 of the fixing element 331 to the snap-fit ​​hole 3311. When the output shaft 122 of the toothbrush body 10 begins to insert into the snap-fit ​​hole 3311 of the fixing element 331, the output shaft 122 pushes outward the connecting ends of the first extension arm 3321 and the second extension arm 3322, causing the elastic element 332 to undergo elastic deformation and accumulate elastic potential energy. When the position of the output shaft 122 inserted into the snap-fit ​​groove 1221 corresponds to the position of the connecting ends of the first extension arm 3321 and the second extension arm 3321, the elastic element 332 begins to return to its initial state, allowing the connecting ends of the first extension arm 3321 and the second extension arm 3322 to protrude into the snap-fit ​​groove 1221 of the output shaft 122, for mounting the brush head 30 on the top of the output shaft 122. (Refer to the attached drawing.) Figures 7 to 9 .

[0054] Preferably, in a specific example of the electric toothbrush of the present invention, the shape and size of the fixing element 331 are matched with the shape and size of the rod portion 32, so that after the fixing element 331 is inserted into the rod groove 321 of the rod portion 32, the fixing element 331 is reliably disposed in the rod groove 321 of the rod portion 32 based on the frictional force generated between the inner wall of the rod portion 32 and the outer wall of the fixing element 331.

[0055] Furthermore, the ends of the first extension arm 3321 and the second extension arm 3322 of the elastic element 332 are clamped between the outer wall of the fixing element 331 and the inner wall of the rod portion 32 to fix the ends of the first extension arm 3321 and the second extension arm 3322 to the outer wall of the fixing element 331. In this way, the connecting ends of the first extension arm 3321 and the second extension arm 3322 are held in the position protruding into the snap-fit ​​hole 3311 of the fixing element 331. Thus, when the output shaft 122 of the toothbrush body 10 is inserted into the snap-fit ​​groove 1221 at a position corresponding to the connecting ends of the first extension arm 3321 and the second extension arm 3322, the connecting ends of the first extension arm 3321 and the second extension arm 3322 can automatically protrude into the snap-fit ​​groove 1221 of the output shaft 122, thereby reliably mounting the brush head 30 on the top of the output shaft 122.

[0056] Furthermore, the outer wall of the fixing element 331 has a receiving groove 3313, which communicates with the side channel 3312. The depth of the receiving groove 3313 is equal to the dimensions of the ends of the first extension arm 3321 and the second extension arm 3322. The ends of the first extension arm 3321 and the second extension arm 3322 are received in the receiving groove 3313 of the fixing element 331. Thus, after the fixing element 331 is inserted into the rod groove 321 of the rod portion 32, the brush head 30 prevents a gap from forming between the inner wall of the rod portion 32 and the outer wall of the fixing element 331. This is crucial for ensuring the hygiene of the electric toothbrush.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An electric toothbrush, characterized in that, include: Brush head; A toothbrush body, wherein the top of the toothbrush body has an output shaft; as well as A bushing having a bushing channel, the bushing being disposed at the top of the toothbrush body, the output shaft being vibratoryly held in the bushing channel of the bushing, a gap being present between the bushing and the output shaft, and the top of the bushing being lower than the top of the output shaft to expose the top of the output shaft, wherein the brush head is detachably mounted on the top of the output shaft.

2. The electric toothbrush according to claim 1, wherein the bushing extends integrally upward from the top of the outer shell of the toothbrush body to be disposed on the toothbrush body.

3. The electric toothbrush according to claim 2, wherein the electric toothbrush includes a flexible waterproof ring having a ring body channel, the top of the output shaft passing through the ring body channel of the waterproof ring to seal the waterproof ring onto the top of the output shaft, and the outer edge of the waterproof ring being sealably connected to the top of the bushing.

4. The electric toothbrush according to claim 3, wherein the outer edge of the waterproof ring is bonded to the top of the bushing; or the waterproof ring is integrally formed on the top of the bushing by an overmolding process.

5. The electric toothbrush according to claim 3, wherein the electric toothbrush includes a cover body having a cover body through hole, the top of the output shaft passing through the cover body through the cover body through hole to fit the cover body onto the top of the output shaft, wherein the cover body is fixedly connected to the top of the bushing, and the outer edge of the waterproof ring is clamped between the cover body and the bushing.

6. The electric toothbrush according to claim 5, wherein the cover has an annular cover groove, the bushing has an annular bushing groove, wherein the outer edge of the waterproof ring has a top boss and a bottom boss, the top boss of the waterproof ring protruding into the cover groove of the cover, and the bottom boss of the waterproof ring protruding into the bushing groove of the bushing.

7. The electric toothbrush according to claim 5, wherein the cover is bonded to the top of the bushing; or the cover is ultrasonically welded to the top of the bushing; or the cover is snapped to the top of the bushing; or the cover is screwed to the top of the bushing.

8. The electric toothbrush according to any one of claims 1 to 7, wherein the top of the output shaft has a snap-fit ​​groove, wherein the brush head includes a head, a shaft extending integrally downward from the head, and a snap-fit ​​portion disposed in a groove of the shaft, the snap-fit ​​portion including a fixing element and an elastic element, the fixing element having snap-fit ​​through holes penetrating opposite ends of the fixing element and a lateral channel communicating with the snap-fit ​​through holes, the elastic element having a first extension arm and a second extension arm extending in a "V" shape, the ends of the first extension arm and the second extension arm being fixedly connected to the outer wall of the fixing element, the connecting end of the first extension arm and the... The connecting end of the second extension arm extends through the side channel of the fixing element to the snap-fit ​​hole. When the output shaft begins to be inserted into the snap-fit ​​hole of the fixing element, the output shaft pushes the connecting ends of the first extension arm and the second extension arm outward to cause the elastic element to undergo elastic deformation and accumulate elastic potential energy. When the position of the output shaft inserted into the snap-fit ​​groove corresponds to the position of the connecting ends of the first extension arm and the second extension arm, the elastic element begins to return to its initial state, allowing the connecting ends of the first extension arm and the second extension arm to protrude into the snap-fit ​​groove of the output shaft for mounting the brush head on the top of the output shaft.

9. The electric toothbrush of claim 8, wherein the ends of the first extension arm and the second extension arm of the elastic element are clamped between the outer wall of the fixing element and the inner wall of the rod portion to fix the ends of the first extension arm and the second extension arm to the outer wall of the fixing element.

10. The electric toothbrush of claim 9, wherein the outer wall of the fixing element has a receiving groove communicating with the side channel, the depth dimension of the receiving groove being equal to the dimensions of the ends of the first extension arm and the second extension arm, and the ends of the first extension arm and the second extension arm being received in the receiving groove of the fixing element.

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