Electric toothbrush

Abstract

The utility model discloses an electric toothbrush, which belongs to the technical field of toothbrushes and has the following beneficial effects compared with the prior art: a brush head connecting piece, a brush head, a connecting rod and a transmission shaft can be conveniently disassembled and assembled, so that the brush head is conveniently disassembled and replaced, and the electric toothbrush is more convenient to use and comprises a handle, a transmission shaft arranged in the handle and a brush head assembly, the toothbrush is characterized in that the brush head assembly comprises a brush head connecting piece which is detachably and fixedly connected with the handle in the axial direction of the transmission shaft; one end of the brush head is in running fit with the brush head connecting piece, and the other end of the brush head is in inserted transmission fit with the transmission shaft.

Description

Technical Field

[0001] This utility model relates to the field of toothbrush technology, and in particular to an electric toothbrush. Background Technology

[0002] Electric toothbrushes are currently a commonly used teeth cleaning tool. Chinese utility model patent application number 2023234982262 discloses a combination adult toothbrush with a rotatable brush head. This toothbrush features a rotatable brush head design, driven by a motor to rotate. The rotating brush head thoroughly cleans the gaps between teeth and the corners of the mouth, improving the cleaning effect on teeth and the oral cavity. The vertical brushing bristles conform to scientific brushing principles, not only cleaning residue between teeth but also massaging the gums, slowing gum recession and promoting gum growth.

[0003] However, the brush heads of the aforementioned toothbrushes are not easy to disassemble and replace. In order to ensure cleaning effect and hygiene, the brush heads need to be replaced after a period of use. Therefore, we propose an electric toothbrush. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems by providing an electric toothbrush that facilitates the disassembly and installation of the brush head and the replacement of the brush head through a detachable brush head assembly.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: an electric toothbrush, comprising a handle, a drive shaft disposed within the handle, and a brush head assembly, wherein the brush head assembly comprises:

[0006] The brush head connector is detachably and fixedly connected to the handle along the axial direction of the drive shaft;

[0007] The brush head is coaxially mounted with the drive shaft. One end of the brush head is rotatably connected to the brush head connector, and the other end is inserted into the drive shaft for transmission.

[0008] Furthermore, the brush head connector includes a connecting sleeve that connects and mates with the handle and a protective plate disposed on one side of the connecting sleeve. An end plate is disposed at the end of the protective plate away from the connecting sleeve, and one end of the brush head is rotatably engaged with the end plate.

[0009] Furthermore, one of the end plate and the brush head is provided with a plug-in post, and the other is provided with a mating hole that is inserted and rotated with the plug-in post.

[0010] Furthermore, the brush head includes a column and bristles disposed on the outer peripheral surface of the column. The insertion post is connected to the column. The column is provided with a stepped shaft coaxial with the insertion post, and the axial dimension of the stepped shaft is smaller than the axial dimension of the insertion post.

[0011] Furthermore, a bushing is embedded in the mating hole, and the insertion post is rotatably engaged with the bushing.

[0012] Furthermore, the guard plate is an arc-shaped plate coaxially arranged with the drive shaft.

[0013] Furthermore, one of the ends of the column and the drive shaft is provided with a first mating part, and the other is provided with a second mating part that is axially inserted and driven to engage with the first mating part.

[0014] Furthermore, the first mating part is a plug groove, and the second mating part is a plug rod.

[0015] Furthermore, a limiting surface is provided at the end of the plug rod away from the plug groove, and the limiting surface is provided facing the end of the plug groove; the distance from the plug end of the plug rod to the limiting surface is less than the depth of the plug groove.

[0016] Furthermore, the cross-section of the connector rod is either straight or cross-shaped.

[0017] The electric toothbrush disclosed in this utility model has the following advantages compared with the prior art: it facilitates the disassembly and installation of the brush head connector, the brush head, the connecting rod, and the drive shaft, thereby facilitating the disassembly and replacement of the brush head and making it more convenient to use. It includes a handle, a drive shaft disposed in the handle, and a brush head assembly. The brush head assembly is characterized in that: the brush head connector is detachably and fixedly connected to the handle along the axial direction of the drive shaft; the brush head is coaxially disposed with the drive shaft, one end of which is rotatably engaged with the brush head connector, and the other end is inserted into the drive shaft for transmission engagement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an electric toothbrush according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the brush head connector in an electric toothbrush according to the present invention.

[0020] Figure 3 This is a cross-sectional view of the brush head connector in an electric toothbrush according to the present invention.

[0021] Figure 4 This is a schematic diagram of the handle of an electric toothbrush according to the present invention.

[0022] Figure 5 This is an exploded view of the handle of an electric toothbrush according to the present invention.

[0023] Figure 6 This is a schematic diagram of the brush head structure in an electric toothbrush according to the present invention.

[0024] Figure 7This is a partial structural diagram of the first connecting part of the brush head in an electric toothbrush according to the present invention.

[0025] Figure 8 This is a partial structural diagram of the second connecting part of the brush head in an electric toothbrush according to the present invention.

[0026] Figure 9 This is a schematic diagram of the first embodiment of the brush head in this utility model.

[0027] Figure 10 This is a schematic diagram of the second embodiment of the brush head in this utility model.

[0028] In the diagram: 1. Handle; 10. External thread; 11. Switch; 12. Charging port; 2. Connecting rod; 21. Connecting post; 22. Internal thread; 23. Mounting hole; 3. Brush head assembly; 30. Protective plate; 31. Connecting sleeve; 32. End plate; 320. Mating hole; 33. Brush head; 330. Post; 331. Brush bristles; 332. Second mating part; 3321. Limiting surface; 333. Insertion post; 3330. Stepped shaft; 34. Bushing; 4. Drive shaft; 41. First mating part. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] Example 1

[0031] Please refer to Figures 1-4 , Figures 6-8 The technical solution of this utility model is as follows: an electric toothbrush, comprising a handle 1, a drive shaft 4 disposed within the handle 1, and a brush head assembly 3, wherein the brush head assembly 3 comprises:

[0032] The brush head connector is detachably and fixedly connected to the handle 1 along the axial direction of the drive shaft 4;

[0033] The brush head 33 is coaxially arranged with the drive shaft 4. One end is rotatably engaged with the brush head connector, and the other end is inserted into the drive shaft 4 for transmission.

[0034] For details, please refer to Figures 1-4 The electric toothbrush provided in this application has the following specific structure: it includes a handle 1, a connecting rod 2 is provided at the end of the handle 1, and a brush head assembly 3 is detachably provided at the end of the connecting rod 2. Consistent with the prior art, the handle 1 has an installation space inside, and a drive motor is provided inside. The drive motor is driven and connected to the transmission shaft 4. The connecting rod 2 has a mounting hole 23 coaxially provided inside for the transmission shaft 4 to extend out. One end of the transmission shaft 4 can protrude from the end of the connecting rod 2 and be driven and connected to the brush head assembly 3.

[0035] refer to Figures 1-3 The brush head assembly 3 includes a brush head connector that is detachably and fixedly connected to the connecting rod 2 along the axial direction. In a specific embodiment, the brush head connector has the following structure: it includes a connecting sleeve 31 that is sleeved on the end of the connecting rod 2, and a brush head 33. The end of the brush head 33 near the drive shaft 4 is inserted into the drive shaft 4 for transmission, and the other end is axially limited and rotated with the brush head connector. This arrangement facilitates the disassembly and installation of the brush head connector and the brush head 33 with the connecting rod 2 and the drive shaft 4, thereby facilitating the disassembly and replacement of the brush head 33 and making it more convenient to use.

[0036] In a specific implementation, a connecting post 21 is provided at the end of the connecting rod 2. The outer circumferential surface of the connecting post 21 is provided with an external thread 10, and the connecting sleeve 31 is provided with an internal thread 22. The two are detachably and fixedly connected by the thread.

[0037] In another embodiment, the connecting sleeve 31 is sleeved on the outer peripheral surface of the connecting post 21, and a threaded through hole (not shown in the figure) is provided on the side wall of the connecting sleeve 31. After the connecting sleeve 31 is placed on the periphery of the connecting post 21, the connecting sleeve 31 and the connecting rod 2 are fixed together by screwing a locking screw into the threaded through hole (not shown in the figure).

[0038] Furthermore, as a specific implementation method, refer to Figures 1-3 The specific structure of the brush head connector is as follows: the brush head connector includes a connecting sleeve 31 that connects and cooperates with the handle 1 and a protective plate 30 disposed on one side of the connecting sleeve 31. An end plate 32 is disposed at the end of the protective plate 30 away from the connecting sleeve 31, and one end of the brush head 33 is rotatably engaged with the end plate 32.

[0039] Specifically, the connecting sleeve 31, the protective plate 30, and the end plate 32 are integrated and all made of plastic. The end plate 32 is perpendicular to the axis of the connecting sleeve 31. When the connecting sleeve 31 is fixed to the end of the connecting rod 2, the end plate 32 and the end of the connecting rod 2 together provide axial limitation for the brush head 33.

[0040] Furthermore, as a specific implementation, one of the end plate 32 and the brush head 33 is provided with a plug-in post 333, and the other is provided with a mating hole 320 that is plugged into and rotated with the plug-in post 333.

[0041] Specifically, as one implementation method, refer to Figure 2 , Figure 3 , Figure 6 , Figure 7The end plate 32 has a mating hole 320 on the side near the connecting sleeve 31. The brush head 33 includes a column 330 and bristles 331 disposed on the outer peripheral surface of the column 330. The end of the column 330 is integrally formed and coaxially provided with a plug post 333. When the brush head assembly 3 is installed on the connecting post 21, the plug post 333 can be inserted into the mating hole 320 and rotated with the mating hole 320. It can be understood that when using the electric toothbrush provided in this application to brush teeth, the end plate 32 will contact the oral cavity wall. In order to ensure that the bristles 331 can fully clean the oral cavity, the axial distance between the bristles 331 and the end plate 32 should be small enough. Through the above-mentioned arrangement, this application can minimize the gap between the column 330 and the end plate 32. Thus, after the brush head 33 is installed, the bristles 331 set on the outer peripheral surface of the column 330 can be as close as possible to the end plate 32, ensuring that the distance between the bristles 331 and the end plate 32 is small enough, thereby ensuring that the bristles 331 can fully clean the oral cavity.

[0042] Furthermore, it is understood that, as another implementation, the mating hole 320 can also be installed on the end face of the column 330, and the insertion post 333 is disposed on the surface of the end plate 32, which can also achieve the purpose of installation and mating.

[0043] Further, as a specific embodiment, the brush head 33 includes a column 330 and bristles 331 disposed on the outer peripheral surface of the column 330. The insertion post 333 is connected to the column 330. The column 330 is provided with a stepped shaft 3330 coaxial with the insertion post 333, and the axial dimension of the stepped shaft 3330 is smaller than the axial dimension of the insertion post 333. As a preferred embodiment, refer to... Figure 7 When the plug 333 is set on the column 330, a stepped shaft 3330 is integrally formed at the end of the column 330. In specific use, the axial dimension of the stepped shaft 3330 is 1-2 mm, and the distance from the plug end of the plug 333 to the end face of the stepped shaft 3330 is less than the hole depth of the mating hole 320. With this setting, after the brush head 33 is installed on the connecting rod 2, the end face of the stepped shaft 3330 contacts and limits the contact with the end plate 32. The end face of the column 330 directly contacts the end plate 32, which can effectively reduce the sliding friction between the column 330 and the end plate 32 when the column 330 rotates, making the brush head 33 rotate more smoothly.

[0044] Furthermore, as a preferred embodiment, refer to Figure 3A bushing 34 is embedded in the mating hole 320, and the insertion post 333 is inserted into and rotates with the bushing 34. Specifically, the bushing 34 is made of copper and is set inside the mating hole 320, while the insertion post 333 is inserted into the bushing 34. By setting the bushing 34, the bushing 34 slides with the insertion shaft, thereby ensuring service life. Furthermore, the axial dimension of the bushing 34 is greater than the depth of the mating hole 320, so that after the bushing 34 is installed in the mating hole 320, it protrudes 5-1 mm from the end plate 320. This allows the end face of the bushing 34 to mate with the end face of the stepped shaft 3330, further reducing the contact area between the post 330 and the end plate 320, resulting in less resistance when the brush head 33 rotates.

[0045] Furthermore, as a preferred embodiment, refer to Figure 2 , Figure 3 The guard plate 30 is an arc-shaped plate coaxially arranged with the transmission shaft 4.

[0046] Further, refer to Figure 4 , Figure 8 One of the ends of the column 330 and the drive shaft 4 is provided with a first mating part 41, and the other is provided with a second mating part 332 that is axially inserted and driven to engage with the first mating part 41.

[0047] Furthermore, the first mating part 41 is a insertion groove, and the second mating part 332 is a insertion rod. As one specific embodiment, refer to... Figure 8 The first mating part 41 is coaxially disposed at the end of the column 330 and is a columnar structure. The second mating part 332 is a groove disposed at the end of the transmission shaft 4 for inserting and mating the columnar structure. After insertion, it can transmit torque. Specifically, the columnar structure can be any structure with a cross-section of triangle, hexagonal prism, straight line, cross, etc., and the cross-section of the groove can be any structure of a matching triangle, hexagonal prism, straight line, cross, etc. The columnar structure can also be a cylinder 330 with at least one keyway on its outer circumferential surface. The groove is a cylindrical groove, and at least one transmission key is disposed on the inner circumferential surface of the cylindrical groove to insert and mate with at least one keyway. Through the above arrangement, the column 330 of the brush head 33 can be inserted and mated with the transmission shaft 4 for transmission.

[0048] Furthermore, a limiting surface 3321 is provided at the end of the plug rod away from the plug groove, and the limiting surface 3321 is provided facing the end of the plug groove; the distance from the plug end of the plug rod to the limiting surface 3321 is less than the depth of the plug groove.

[0049] Preferred, Reference Figure 8Taking a cross-shaped plug rod as an example, the plug rod and the column 330 are integrally formed. A second connecting post 21 is provided at the connection position between the plug rod and the column 330. The end face of the second connecting post 21 is the limiting surface 3321. By setting the limiting surface 3321, after the plug rod 333 is inserted into the plug groove of the drive shaft 4, the limiting surface 3321 contacts and positions the end face of the drive shaft 4 for positioning and limiting cooperation. After the brush head 33 is installed on the connecting rod 2, the limiting surface 3321 and the end face of the stepped shaft 3330 jointly limit and position the brush head 33 axially. By setting the limiting surface 3321, after the brush head 33 is installed on the connecting rod 2, it is ensured that the end face of the column 330 and the connecting shaft can be spaced a certain distance apart and do not directly contact and rub against each other.

[0050] Furthermore, as another embodiment, the insertion shaft can also be provided at the end of the transmission shaft 4, while the insertion groove is provided on the end face of the column 330.

[0051] Furthermore, as a specific implementation, the cross-section of the connector rod is either straight or cross-shaped. Specifically, straight and cross-shaped structures are simple in structure, easy and convenient to manufacture, and provide reliable transmission, thus reducing production costs.

[0052] Furthermore, as a specific implementation method, in a specific application process, the brush head 33 includes... Figure 9 , Figure 10 The two structures shown, Figure 9 In the middle, along the axial direction, the bristles 331 are arranged in a wavy pattern with alternating long and short bristles. Figure 10 In the middle, the bristles of brush 331 are all of the same length.

[0053] Example 2

[0054] The technical solution of this utility model is: an electric toothbrush, as shown in the reference. Figure 5 In a preferred embodiment, the handle 1 and the connecting rod 2 are detachably fixedly connected. Specifically, the end of the handle 1 is provided with an external thread 10, and the connecting rod 2 is provided with an internal thread 22. The handle 1 has a cavity inside to accommodate the drive motor, and the connecting rod 2 has a mounting hole 23 coaxially inside. The mounting hole 23 is a through hole that passes through both ends of the connecting rod 2 and is used to install the drive shaft 4. The connection method between the drive motor and the drive shaft 4 can adopt any method in the prior art. It is not specifically limited here, as long as it can achieve the purpose of use.

[0055] Furthermore, a storage battery can be installed at the bottom of the receiving cavity, and a charging port 12 is provided at the end of the handle 1 for charging the storage battery.

[0056] Further, refer to Figure 5A control switch 11 is provided on the handle 1. The control switch 11 includes forward and reverse control positions and speed control positions. When using the electric toothbrush, the control switch 11 can be adjusted as needed to switch between forward and reverse rotation and speed. It should be noted that the control switch 11 is a switch 11 with corresponding control functions currently available in the art. As long as the corresponding control purpose can be achieved, it is acceptable. There is no specific limitation here, and those skilled in the art should understand.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An electric toothbrush comprising a handle (1), a transmission shaft (4) and a brush head assembly (3) arranged in the handle (1), characterized in that, The brush head assembly (3) comprises: a brush head connecting piece, which is detachably fixedly connected with the handle (1) in the axial direction of the transmission shaft (4); a brush head (33), which is coaxially arranged with the transmission shaft (4), one end of which is rotationally matched with the brush head connecting piece, and the other end of which is plug-in transmission matched with the transmission shaft (4).

2. The electric toothbrush according to claim 1, wherein The brush head (33) connecting piece comprises a connecting sleeve (31) connected and matched with the handle (1) and a guard plate (30) arranged on one side of the connecting sleeve (31), and an end plate (32) is arranged at the end of the guard plate (30) away from the connecting sleeve (31), and one end of the brush head (33) is rotationally matched with the end plate (32).

3. The electric toothbrush according to claim 2, wherein One of the end plate (32) and the brush head (33) is provided with a plug-in column (333), and the other is provided with a matching hole (320) plug-in rotationally matched with the plug-in column (333).

4. The electric toothbrush according to claim 3, wherein The brush head (33) comprises a column body (330) and bristles (331) arranged on the outer circumferential surface of the column body (330), the plug-in column (333) is connected with the column body (330), and a stepped shaft (3330) coaxial with the plug-in column (333) is arranged on the column body (330), and the axial dimension of the stepped shaft (3330) is smaller than that of the plug-in column (333).

5. An electrically powered toothbrush according to claim 3 or 4, wherein the head is mounted on the neck by a hinge arrangement. The matching hole (320) is embedded with a bushing (34), and the plug-in column (333) is plug-in rotationally matched with the bushing (34).

6. An electrically powered toothbrush according to any one of claims 2 to 4, wherein the head is pivotally mounted to the handle. The guard plate (30) is an arc-shaped plate coaxially arranged with the transmission shaft (4).

7. The electrically powered toothbrush of claim 4 wherein: One of the end of the column body (330) and the end of the transmission shaft (4) is provided with a first matching part (41), and the other is provided with a second matching part (332) axially plug-in transmission matched with the first matching part (41).

8. The electrically powered toothbrush of claim 7 wherein, The first matching part (41) is a plug-in slot, and the second matching part (332) is a plug-in rod.

9. The electrically powered toothbrush of claim 8 wherein, The end of the plug-in rod away from the plug-in slot is provided with a limiting surface (3321), and the limiting surface (3321) is arranged to face the end of the plug-in slot; the distance from the plug-in end of the plug-in rod to the limiting surface (3321) is smaller than the depth of the plug-in slot.

10. The electrically powered toothbrush of claim 9 wherein, The cross section of the plug-in rod is in the shape of a Chinese character or a cross.

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