Brush head assembly of electric toothbrush

Abstract

The utility model provides a brush head assembly of an electric toothbrush, the lower end of the brush head assembly is clamped with an output shaft of an electric toothbrush body, and the brush head assembly comprises a brush head and a connecting neck; the lower end face of the brush head is provided with a vertical slot, and the edge of the lower port of the slot protrudes inwards in the radial direction to form a first tooth part; the upper end face of the connecting neck is provided with a vertical plug, and the edge of the upper end of the plug protrudes outwards in the radial direction to form a second tooth part. After the plug is inserted into the slot, the second tooth part can be clamped above the first tooth part along with the horizontal rotation of the connecting neck; a locking piece is arranged in the connecting neck and slides vertically, a locking groove is formed in the non-center position of the lower end of the brush head, and the top end of the locking piece can penetrate out of the upper end of the connecting neck to be inserted into the locking groove to limit horizontal rotation of the brush head. According to the brush head assembly, the brush head with the bristles is detachably connected with the connecting neck, so that the bristles can be directly detached and the brush head can be replaced when the bristles are replaced, the connecting neck can be repeatedly used, and waste of resources is avoided.

Description

Technical Field

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

[0002] An electric toothbrush is a new technology product that can efficiently clean teeth and protect gums. It includes a main body and a brush head. The main body usually includes a housing and a motor. The brush head usually includes bristles and a connecting neck for mounting the bristles. The brush head is detachably connected to the output shaft of the motor by means of a snap connection. When not in use or when the brush head needs to be replaced, the brush head can be removed.

[0003] However, the most vulnerable part of the brush head is the bristles. After using the electric toothbrush for a period of time, the bristles are prone to bending, turning outward, wearing and shortening, and other problems, and the brush head needs to be replaced. In addition, for health reasons, people usually replace the brush head regularly, mainly to avoid bacteria in the bristles.

[0004] However, the existing brush head part is an integral part and needs to be replaced as a whole. However, when the bristle part has problems, the connecting neck part can still be used. If the brush head part is replaced as a whole, the connecting neck part will be wasted, which is not conducive to saving resources. Utility Model Content

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a brush head assembly of an electric toothbrush.

[0006] The technical solution of this utility model is as follows:

[0007] A brush head assembly of an electric toothbrush, the lower end of which is clamped with the output shaft of the electric toothbrush body, and comprises a brush head and a connecting neck;

[0008] A vertical slot is provided on the lower end surface of the brush head, and a first tooth portion protrudes radially inwardly from the edge of the lower port of the slot;

[0009] A vertical plug is provided on the upper end surface of the connecting neck, and a second tooth portion protrudes radially outward from the upper edge of the plug;

[0010] After the plug is inserted into the slot, the second tooth portion can rotate horizontally with the connecting neck and be stuck above the first tooth portion;

[0011] A locking piece is arranged inside the connecting neck, and the locking piece slides vertically. A locking groove is arranged at a non-central position of the lower end of the brush head, and the top end of the locking piece can pass through the upper end of the connecting neck and be inserted into the locking groove, thereby limiting the horizontal rotation of the brush head.

[0012] When in use, the brush head is first plugged into the connecting neck, and then twisted relative to each other so that the first tooth portion and the second tooth portion engage with each other, limiting the axial separation between the brush head and the connecting neck, and then the locking piece is axially slid into the locking groove to limit the relative circumferential rotation between the brush head and the connecting neck, thereby stably fixing the brush head and the connecting neck together.

[0013] When replacement is needed, just reverse the operation, remove the brush head from the connecting neck, and replace it separately. The connecting neck part can be reused.

[0014] In the above solution, both the first tooth portion and the second tooth portion include a plurality of teeth, and the number of the first tooth portion and the second tooth portion is the same, so as to improve the clamping effect between the first tooth portion and the second tooth portion, so that the brush head can be stably clamped on the connecting neck.

[0015] Furthermore, a plurality of first teeth are evenly distributed along the edge of the lower port of the slot, and the second teeth matched therewith are also evenly distributed along the edge of the upper end of the plug, which not only facilitates processing but also ensures uniform force at the clamping position when the brush head and the connecting neck are clamped.

[0016] In order to prevent the brush head and the connecting neck from rotating excessively relative to each other, which would affect the clamping effect, a stopper is bent upward on a side edge of at least one first tooth portion, which is located on the circumference of the slot. When the brush head and the connecting neck rotate relative to each other, the stopper is located in the rotation direction of the second tooth portion, blocking the second tooth portion. In addition, it also serves to remind the user that the connection has been made, making the connection operation of the brush head and the connecting neck more convenient. In addition, it also serves to quickly align the upper end of the locking piece with the locking groove, avoiding repeated rotation and debugging.

[0017] Preferably, the first tooth portion and the second tooth portion are both in the shape of horizontal plates, so as to increase the joint surface between the first tooth portion and the second tooth portion, so that the brush head can be stably connected to the connecting neck.

[0018] In order to facilitate processing and avoid affecting the installation of bristles, the brush head includes a bristle part, a connecting column protruding downward from the lower end of the bristle part, and a slot is set at the lower end of the connecting column. The design of the connecting column can avoid damage to the structure of the bristle part, and also avoid making the bristle part too thick or too long due to the design of the slot and other structures, which affects the comfort of use.

[0019] Preferably, the upper end surface of the connecting neck is the same shape as the connecting cylinder, and the vertical center lines of the slot, plug, upper end surface of the connecting neck and lower end surface of the connecting cylinder are collinear, so that the brush head and the connecting neck are seamlessly connected, and the outer side surfaces are aligned, thereby improving the overall appearance of the brush head assembly.

[0020] In order to prevent water or toothpaste from entering between the brush head and the connecting neck through the connecting gap, causing long-term bacterial growth and being detrimental to health, the present application further provides a sealing gasket between the lower end of the connecting column and the upper end of the connecting neck.

[0021] In the present application, the lower end of the locking member can abut against the top end of the output shaft of the electric toothbrush body. When the brush head assembly is installed on the electric toothbrush body, the locking member is lifted up by the output shaft on the body, so that the top of the locking member is inserted into the locking groove. During the use of the electric toothbrush, since the output shaft always presses against the locking member, the locking member will not be separated from the locking groove, thereby ensuring that the connecting neck locks the circumferential rotation of the brush head, thereby ensuring the structural stability of the brush head assembly during the use of the electric toothbrush.

[0022] In order to allow the locking piece to automatically fall back and unlock the brush head when the brush head assembly is removed from the electric toothbrush body, a connecting groove is provided at the lower end of the connecting neck, the lower end of the locking piece is located in the connecting groove, and a compression spring is provided between the locking piece and the bottom surface of the connecting groove.

[0023] The utility model provides a brush head assembly for an electric toothbrush, in which a brush head with bristles and a connecting neck are detachably connected, so that when the bristles are replaced, the brush head can be directly disassembled and replaced, and the connecting neck can be reused, thus avoiding waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached picture:

[0025] Figure 1 is a cross-sectional schematic diagram of a brush head assembly;

[0026] Figure 2 is an exploded schematic diagram of a brush head assembly;

[0027] Figure 3 A schematic diagram of a brush head viewed from above;

[0028] Figure 4 Schematic diagram of the top view of the connecting neck.

[0029] The components represented by the reference numerals in the figure are:

[0030] 1. Brush head; 11. Slot; 12. First tooth portion; 13. Locking groove; 14. Bristle portion; 15. Connecting column; 16. Stop portion; 2. Connecting neck; 21. Plug; 22. Second tooth portion; 23. Locking piece; 24. Slideway; 25. Connecting groove; 3. Sealing gasket; 4. Output shaft. DETAILED DESCRIPTION

[0031] like Figures 1 to 4 As shown, the embodiment of the utility model provides a brush head assembly of an electric toothbrush, the lower end of which is clamped with the output shaft 4 of the electric toothbrush body, and includes a brush head 1 and a connecting neck 2;

[0032] A vertical slot 11 is provided on the lower end surface of the brush head 1, and a first tooth portion 12 protrudes radially inwardly from the lower end edge of the slot 11;

[0033] A vertical plug 21 is provided on the upper end surface of the connecting neck 2, and a second tooth portion 22 protrudes radially outward from the upper edge of the plug 21;

[0034] After the plug 21 is inserted into the slot 11, the second tooth portion 22 can rotate horizontally with the connecting neck 2 and be stuck above the first tooth portion 12;

[0035] A locking piece 23 is provided inside the connecting neck 2, and the locking piece 23 slides vertically. A locking groove 13 is provided at a non-central position at the lower end of the brush head 1, and the top end of the locking piece 23 can pass through the upper end of the connecting neck 2 and insert into the locking groove 13, thereby limiting the horizontal rotation of the brush head 1.

[0036] When in use, the brush head 1 and the connecting neck 2 are first plugged in, and then twisted relative to each other, so that the first tooth portion 12 and the second tooth portion 22 rotate horizontally and then engage with each other, limiting the vertical separation between the brush head 1 and the connecting neck 2, and then the locking piece 23 is vertically slid into the locking groove 13 to limit the relative horizontal rotation between the brush head 1 and the connecting neck 2, thereby stably fixing the brush head 1 and the connecting neck 2 together.

[0037] When replacement is needed, the brush head 1 can be removed from the connecting neck 2 by simply performing the reverse operation and then replaced separately. The connecting neck 2 can be reused, thus avoiding waste of resources.

[0038] The technical solution of this embodiment is described in detail below with reference to the accompanying drawings:

[0039] In the present application, the brush head 1 includes a bristle portion 14, and the slot 11 can be directly arranged at the lower end of the bristle portion 14. However, if so, the bristle portion 14 will be too thick or too long in order to be able to process the slot 11 and other structures, which will affect the comfort of use. In addition, the structure of the bristle portion 14 will be damaged. Therefore, in this embodiment, a connecting column 15 protrudes downward from the lower end of the bristle portion 14, and the slot 11 is arranged at the lower end of the connecting column 15, which facilitates the processing of the connecting groove 25 and provides free space for the structural design of the bristle portion 14. Usually, the length of the connecting column 15 will not be too long to save materials. (See Figure 1 and Figure 2 )

[0040] Please combine Figure 3 and Figure 4 In this embodiment, the upper end surface of the connection neck 2 and the connection column 15 have the same shape, preferably both are circular, and the slot 11 is preferably a cylindrical slot, and the plug 21 is a cylinder. The vertical center lines of the slot 11, the plug 21, the upper end surface of the connection neck 2 and the lower end surface of the connection column 15 are collinear, so that the brush head 1 and the connection neck 2 can be seamlessly connected, and the outer side surfaces are aligned, which improves the overall appearance of the brush head assembly.

[0041] In addition, the first tooth portion 12 and the second tooth portion 22 each include a plurality of the same number, so as to improve the clamping effect between the first tooth portion 12 and the second tooth portion 22 , so that the brush head 1 can be stably clamped on the connecting neck 2 .

[0042] Among them, a plurality of first teeth 12 are evenly distributed along the edge of the lower port of the slot 11, and the second teeth 22 matched therewith are also evenly distributed along the edge of the upper end of the plug 21. This not only facilitates processing, but also makes the force at the clamping position of the brush head 1 and the connecting neck 2 uniform when clamped, thereby improving the stability of the clamping between the brush head 1 and the connecting neck 2.

[0043] There is a spacing distance between two adjacent first tooth portions 12, and there is also a spacing distance between two adjacent second tooth portions 22. When the brush head 1 is docked with the connecting neck 2, each first tooth portion 12 corresponds between two adjacent second tooth portions 22, and each second tooth portion 22 corresponds between two adjacent first tooth portions 12, so that the first tooth portions 12 and the second tooth portions 22 can be staggered and interspersed with each other.

[0044] In order to prevent the brush head 1 and the connecting neck 2 from rotating excessively relative to each other and affecting the clamping effect, a stopper 16 is bent upward on a side edge of at least one first tooth portion 12 located on the circumference of the slot 11. When the brush head 1 and the connecting neck 2 rotate relative to each other, the stopper 16 blocks the second tooth portion 22 in the rotation direction and prevents the second tooth portion 22 from continuing to rotate.

[0045] In addition, the resistance when the second tooth portion 22 abuts against the stop portion 16 can remind the user that the lock is in place and the subsequent locking operation can be performed, making the connection operation between the brush head 1 and the connecting neck 2 more convenient. In addition, the stop portion 16 also plays a role in quickly aligning the upper end of the locking member 23 with the locking groove 13 to avoid repeated rotation attempts.

[0046] In this embodiment, the first tooth portion 12 and the second tooth portion 22 are preferably both in a horizontal plate shape to increase the joint surface of the first tooth portion 12 and the second tooth portion 22 so that the brush head 1 can be stably connected to the connecting neck 2 .

[0047] Please refer to Figure 1 and Figure 2 In order to prevent water or toothpaste from entering between the brush head 1 and the connecting neck 2 through the connecting gap, which may cause long-term bacterial growth and be detrimental to health, the present embodiment further provides a sealing gasket 3 between the lower end of the connecting column 15 and the upper end of the connecting neck 2. The sealing gasket 3 is made of elastic material, which can not only seal the gap, but also apply elastic force to the brush head 1 and the connecting neck 2, so that the first tooth portion 12 and the second tooth portion 22 are clamped more tightly and firmly.

[0048] In this embodiment, the locking member 23 slides vertically in the connecting neck 2 , and a slideway 24 matching the shape of the locking member 23 and allowing the locking member 23 to slide up and down is provided in the connecting neck 2 .

[0049] In this embodiment, the locking piece 23 is a rectangular plate, and the slide 24 is a rectangular groove. The upper end extends to the lower side surface of the second tooth portion 22, and the lower end extends to the lower end surface of the connecting neck 2. Specifically, a connecting groove 25 is provided at the lower end of the connecting neck 2, and the lower end of the slide 24 extends to the bottom surface of the connecting groove 25, so that the lower end of the locking piece 23 extends out of the slide 24 and is located in the connecting groove 25.

[0050] The locking piece 23 is located at the vertical center of the connecting neck 2, and its width is greater than the diameter of the plug 21. The locking groove 13 is opened on one or two first tooth portions 12 at opposite positions, forming a U-shaped notch, and the opening is located on the side of the first tooth portion 12 away from the brush head 1 housing. The locking piece 23 slides upward, and one or both sides of the top are stuck in the locking groove 13.

[0051] A compression spring is provided between the lower end of the locking member 23 and the bottom surface of the connecting groove 25, and the lower end of the locking member 23 can abut against the top end of the output shaft 4 of the electric toothbrush body. When the brush head assembly is installed on the electric toothbrush body, the locking member 23 is lifted up by the output shaft 4, so that the locking member 23 is inserted into the locking groove 13. During the use of the electric toothbrush, since the output shaft 4 always presses against the locking member 23, the locking member 23 will not be separated from the locking groove 13, thereby ensuring that the connecting neck 2 locks the brush head 1 in circumferential rotation, thereby ensuring the structural stability of the brush head assembly during the use of the electric toothbrush.

[0052] When the brush head assembly is removed from the electric toothbrush body, the locking member 23 automatically falls back under the action of the compression spring, thereby releasing the lock on the brush head 1 .

Claims

1. A brush head assembly of an electric toothbrush, the lower end of which is clamped with an output shaft (4) of an electric toothbrush body, characterized in that: It comprises a brush head (1) and a connecting neck (2); The lower end surface of the brush head (1) is provided with a vertical slot (11), and the lower end edge of the slot (11) is provided with a first tooth portion (12) protruding radially inwardly; The upper end surface of the connecting neck (2) is provided with a vertical plug (21), and the upper end edge of the plug (21) is provided with a second tooth portion (22) protruding radially outward; After the plug (21) is inserted into the slot (11), the second tooth portion (22) can rotate horizontally with the connecting neck (2) and be stuck above the first tooth portion (12); A locking piece (23) is provided inside the connecting neck (2), and the locking piece (23) slides vertically. A locking groove (13) is provided at a non-central position of the lower end of the brush head (1), and the top end of the locking piece (23) can pass through the upper end of the connecting neck (2) and be inserted into the locking groove (13), thereby limiting the horizontal rotation of the brush head (1).

2. A brush head assembly for an electric toothbrush as claimed in claim 1, characterized in that: The first tooth portion (12) and the second tooth portion (22) each include a plurality of teeth, and the number of the two teeth is the same.

3. A brush head assembly for an electric toothbrush as claimed in claim 2, characterized in that: A plurality of the first teeth (12) are evenly distributed along the edge of the lower port of the slot (11).

4. A brush head assembly for an electric toothbrush as claimed in claim 3, characterized in that: At least one of the first tooth portions (12) is located on a side edge in the circumferential direction of the slot (11) and is bent upward to form a stop portion (16).

5. A brush head assembly for an electric toothbrush as claimed in claim 4, characterized in that: The first tooth portion (12) and the second tooth portion (22) are both in the shape of horizontal plates.

6. A brush head assembly for an electric toothbrush as claimed in claim 1, characterized in that: The brush head (1) comprises a bristle portion (14), a connecting column (15) protruding downward from the lower end of the bristle portion (14), and the slot (11) is arranged at the lower end of the connecting column (15).

7. A brush head assembly for an electric toothbrush as claimed in claim 6, characterized in that: The upper end surface of the connecting neck (2) has the same shape as the surface of the connecting column (15), and the vertical center lines of the slot (11), the plug (21), the upper end surface of the connecting neck (2) and the lower end surface of the connecting column (15) are collinear.

8. A brush head assembly for an electric toothbrush as claimed in claim 7, characterized in that: A sealing gasket (3) is provided between the lower end of the connecting column (15) and the upper end of the connecting neck (2).

9. A brush head assembly for an electric toothbrush as claimed in claim 1, characterized in that: The lower end of the locking member (23) can abut against the top end of the output shaft (4) of the electric toothbrush body.

10. A brush head assembly for an electric toothbrush as claimed in claim 9, characterized in that: The lower end of the connecting neck (2) is provided with a connecting groove (25), the lower end of the locking member (23) is located in the connecting groove (25), and a compression spring is provided between the lower end of the locking member (23) and the bottom surface of the connecting groove (25).

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