Electric toothbrush and replacement head therefor
By machining insertion holes on the brush handle and using a retaining structure that abuts against the motor shaft with a soft rubber block, the problems of complex structure and high processing cost of electric toothbrush replacement heads are solved, resulting in a simple and low-cost electric toothbrush replacement head that improves the fixing effect and aesthetics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANGLO-AMERICAN TOOTHBRUSH TECHNOLOGY (DONGGUAN) CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-29
AI Technical Summary
Existing electric toothbrush replacement heads have complex structures, high processing costs, and high requirements for bottom plug assembly.
Insertion holes are directly machined on the brush rod, and notches are made on the cylinder wall. Soft rubber blocks are used to abut against the motor shaft, and the soft rubber blocks are used to hold the motor shaft in place, thus eliminating the need for a bottom plug structure.
The structure of the electric toothbrush replacement head has been simplified, reducing processing costs and achieving a more stable motor shaft fixation, thus improving the aesthetics of the electric toothbrush.
Smart Images
Figure CN224292038U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oral care technology, and in particular to an electric toothbrush and its replacement head. Background Technology
[0002] Toothbrushes are essential oral care tools for humans. With the advent of electric toothbrushes, their high efficiency, portability, and superior cleaning effect have made them increasingly popular among consumers.
[0003] Existing electric toothbrushes include a main unit and a replacement toothbrush head. The main unit includes a motor shaft, and the replacement toothbrush head includes a brush handle and a brush head. The brush handle has a shaft hole for inserting the motor shaft. The main unit is inserted into the shaft hole of the replacement toothbrush head via the motor shaft, and the high-speed rotating motor shaft drives the replacement toothbrush head to move, thus cleaning the oral cavity.
[0004] To ensure a stable connection between the motor shaft and the toothbrush replacement head's shaft hole, existing electric toothbrush replacement heads use a bottom plug inside the shaft hole to effectively secure the motor shaft. However, this type of electric toothbrush replacement head has a complex structure, and the assembly requirements for the bottom plug within the shaft hole are high, increasing the manufacturing cost of the electric toothbrush replacement head. Utility Model Content
[0005] The main objective of this invention is to provide an electric toothbrush and its replacement head that are simple in structure and have low processing costs.
[0006] To achieve the above objectives, this utility model proposes an electric toothbrush replacement head for connection to the main unit of an electric toothbrush; characterized in that it includes a brush handle and a brush head connected to the brush handle; the brush handle includes:
[0007] The body includes a cylindrical wall, which includes a first end and a second end opposite to each other. The first end is connected to the brush head, and the end face of the second end is recessed toward the first end to form an insertion hole for the motor shaft of the host to be fitted and inserted. The cylindrical wall of the body is provided with a notch, which extends from the end face of the second end of the body toward the first end of the body.
[0008] A soft rubber block is embedded in the notch and is used to abut against the motor shaft.
[0009] Optionally, the soft rubber block includes an inner wall surface embedded in the notch, and the inner wall surface is provided with a first retaining part, which retains itself in conjunction with a second retaining part on the main motor shaft.
[0010] Optionally, the first retaining part is integrally formed with the soft rubber block; and / or, of the first retaining part and the second retaining part, one is a recess and the other is a buckle.
[0011] Optionally, the first holding part includes an embedded plate and a latching part protruding perpendicular to the embedded plate. The embedded plate is embedded in the inner wall surface of the soft rubber block, and the latching part is located outside the inner wall surface of the soft rubber block and is held by the second holding part.
[0012] Optionally, the hardness of the first holding part is higher than the hardness of the soft rubber block.
[0013] Optionally, the first holding part is a locking protrusion provided on the inner wall surface of the soft rubber block; the soft rubber block is provided with a blind groove, which extends from one end of the soft rubber block to the other end; and the first holding part is provided on the side wall of the blind groove.
[0014] Optionally, the soft rubber block includes an inner wall surface and an outer wall surface that are disposed opposite to each other. After the soft rubber block is inserted into the notch, the inner wall surface is coplanar with the inner surface of the insertion hole, and / or the outer wall surface is coplanar with the outer surface of the cylinder wall.
[0015] Optionally, the soft rubber block includes an inner wall surface and an outer wall surface disposed opposite to each other, and a peripheral sidewall connecting the inner wall surface and the outer wall surface, wherein the peripheral sidewall is interlocked with the second sidewall of the notch.
[0016] Optionally, one of the peripheral sidewalls of the soft rubber block and the second sidewall of the notch is provided with a retaining block, and the other is provided with a retaining groove corresponding to the retaining block. The retaining block and the retaining groove retain each other to fix the soft rubber block to the notch.
[0017] Optionally, both the retaining block and the retaining groove extend along the extension direction of the notch.
[0018] Optionally, the end face of the second end of the body is inclined on the side away from the socket; and / or, the end face of the second end of the body is inclined on the side close to the socket.
[0019] Optionally, the brush head includes a brush plate and bristles fixed on the brush plate; the insertion hole includes a first sidewall and a top wall, the first sidewall has a directional surface on the side near the bristles, the directional surface abuts against the first flat surface of the motor shaft; the distance between the directional surface and the central axis of the insertion hole is less than the distance between the first flat surface and the central axis of the insertion hole.
[0020] Optionally, the opposite side of the first flat surface on the motor shaft is a second flat surface, the opposite side of the orientation surface on the first sidewall is an arc surface, and a receiving cavity is formed between the opposite side of the orientation surface on the first sidewall and the second flat surface.
[0021] Optionally, the notch includes two opposing second sidewalls, with a connecting bridge between the two second sidewalls.
[0022] This utility model also provides an electric toothbrush, including a toothbrush replacement head and a main unit, wherein a motor shaft protrudes from the upper end of the main unit; the motor shaft is inserted into the toothbrush replacement head; the toothbrush replacement head is the toothbrush replacement head structure of any of the above embodiments.
[0023] Compared with the existing electric toothbrush replacement head, this utility model has the following beneficial technical effects: the electric toothbrush replacement head directly forms an insertion hole for the main motor shaft to be assembled on the brush handle, and at the same time, a notch is opened on the wall of the brush handle, and a soft rubber block is installed at the notch. The soft rubber block abuts against the main motor shaft, which not only saves the bottom plug structure of the toothbrush replacement head, but also achieves better fixation between the toothbrush replacement head and the motor shaft. It is not only simple in structure, but also reduces the processing cost. Attached Figure Description
[0024] 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.
[0025] Figure 1 This is a schematic diagram of the structure of an embodiment of the electric toothbrush of this utility model;
[0026] Figure 2 This is a cross-sectional structural diagram of an embodiment of the electric toothbrush of this utility model;
[0027] Figure 3 This is a schematic diagram of the structure of a toothbrush replacement head according to an embodiment of the present invention;
[0028] Figure 4 This is a schematic diagram of another embodiment of the toothbrush replacement head of this utility model;
[0029] Figure 5 This is a schematic diagram of the structure of a soft rubber block in an embodiment of the toothbrush replacement head of this utility model;
[0030] Figure 6 This is a schematic diagram of another embodiment of the soft rubber block in the toothbrush replacement head of this utility model;
[0031] Figure 7 This is a partial cross-sectional structural diagram of another embodiment of the toothbrush replacement head of this utility model;
[0032] Figure 8 This is a schematic diagram of another embodiment of the toothbrush replacement head of this utility model;
[0033] Figure 9This is a cross-sectional structural diagram of a toothbrush replacement head according to an embodiment of the present invention;
[0034] Figure 10 for Figure 9 A structural diagram of a toothbrush replacement head from another angle;
[0035] Figure 11 for Figure 9 An enlarged structural diagram of part A in a toothbrush replacement head;
[0036] Figure 12 This is a schematic diagram of the toothbrush replacement head according to another embodiment of the present invention.
[0037] To better illustrate the toothbrush replacement head structure, some of the structures in the accompanying drawings have been enlarged.
[0038] Explanation of icon numbers:
[0039] Electric toothbrush-1;
[0040] Toothbrush replacement head - 100;
[0041] Brush rod - 10; Insertion hole 101; First side wall - 102; Arc surface - 102a; Guide surface - 102b; Orientation surface - 102c; Top wall - 103; Clearing hole - 104; Receiving cavity - 105; Body - 12; First end - 12a; Second end - 12b; Cylinder wall - 121; End face - 122; Notch - 13; Second side wall - 130; Holding block - 131; Connecting bridge - 132; Soft rubber block - 14; Inner wall surface - 141; Outer wall surface - 142; First holding part 143; Embedded plate - 1431; Buckle part - 1432; Peripheral side wall - 144; Holding groove - 145; Blind groove - 146
[0042] Brush head - 20; Brush plate - 21; Brush bristles - 22;
[0043] Main unit - 300; motor shaft - 301; second clamping part - 302; first flat surface - 303; second flat surface - 304.
[0044] 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
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] This utility model proposes a novel electric toothbrush structure, and in particular, a toothbrush replacement head structure for an electric toothbrush.
[0050] Reference Figure 1 and Figure 2The electric toothbrush 1 includes a toothbrush replacement head 100 and a main unit 300, as well as a motor assembly, control circuit, power supply, and other structures (not shown) located within the main unit 300. The main unit 300 can also be referred to as the brush handle. The toothbrush replacement head 100 is detachably connected to the main unit 300 for easy replacement. A motor shaft 301 protrudes from one end of the main unit 300 facing the toothbrush replacement head 100, and a recessed insertion hole 101 is provided at the end of the toothbrush replacement head 100 near the main unit 300. The motor shaft 301 is inserted into the insertion hole 101 of the toothbrush replacement head 100, thereby mounting the toothbrush replacement head 100 onto the main unit 300. When the motor assembly is working, the motor shaft 301 transmits power to the toothbrush replacement head 100, thereby driving the toothbrush replacement head 100 to rotate or vibrate, achieving efficient oral cleaning.
[0051] Combined with reference Figure 3 , Figure 4 ,and Figure 5 In one embodiment of the present invention, the toothbrush replacement head 100 includes a brush handle 10 and a brush head 20 connected to the brush handle 10.
[0052] The brush handle 10 includes a body 12 and a soft rubber block 14. Among them,
[0053] The main body 12 includes a cylindrical wall 121, which includes a first end 12a and a second end 12b. The first end 12a is connected to the brush head 20, and the end face 122 of the second end 12b is recessed toward the first end 12a to form an insertion hole 101. The insertion hole 101 is for the motor shaft 301 of the main unit 300 to be inserted and assembled.
[0054] The cylindrical wall 121 of the main body 12 is provided with a notch 13, which is formed from the end face 122 of the second end 12b of the main body 12 toward the first end 12a of the main body 12.
[0055] The soft rubber block 14 is embedded in the notch 13 and is used to abut against the motor shaft 301, thereby holding the motor shaft 301 in the socket 101.
[0056] This utility model of an electric toothbrush replacement head has an insertion hole for assembling the main motor shaft directly machined on the brush handle. At the same time, a notch is made in the wall of the brush handle, and a soft rubber block is installed at the notch. The soft rubber block abuts against the main motor shaft. This not only saves the bottom plug structure of the toothbrush replacement head, but also achieves better fixation between the toothbrush replacement head and the motor shaft. It is not only simple in structure, but also reduces the processing cost.
[0057] Furthermore, the soft rubber block 14 includes an inner wall surface 141 and an outer wall surface 142 disposed opposite to each other. The inner wall surface 141 is an arc surface, and the radius of the arc surface of the inner wall surface 141 is equal to the radius of the insertion hole 101. This allows the inner wall surface 141 to be coplanar with the inner surface of the insertion hole 101 after the soft rubber block 14 is embedded in the notch 13, thereby adapting and fitting with the motor shaft 301. Since the soft rubber block 14 is elastic, the inner wall surface 141 of the soft rubber block 14 and the motor shaft 301 can also achieve an interference fit, so that the inner wall surface 141 of the soft rubber block 14 and the inner wall of the insertion hole 101 together fix the motor shaft 301.
[0058] Furthermore, the outer wall surface 142 of the soft rubber block 14 can be coplanar with the outer surface of the cylinder wall 121. This makes the toothbrush replacement head more aesthetically pleasing.
[0059] In one embodiment, in conjunction with reference to Figure 1 , Figure 2 , Figure 5 The motor shaft 301 is provided with a second retaining part 302, as shown in the recess. The inner wall surface 141 of the soft rubber block 14 is provided with a first retaining part 143, which is engaged with the second retaining part 302 on the main motor shaft 301. After the soft rubber block 14 is inserted into the notch 13, the inner wall surface 141 of the soft rubber block 14 is in close contact with the outer surface of the motor shaft 301, and the first retaining part 143 and the second retaining part 302 are engaged, so that the soft rubber block 14 and the inner wall of the insertion hole 101 together achieve better fixation of the motor shaft 301.
[0060] Specifically, refer to Figure 1 and Figure 5 The second retaining part 302 is recessed, and correspondingly, the first retaining part 143 is a snap-fit structure protruding from the inner wall surface 141 of the soft rubber block 14. Alternatively, the second retaining part 302 can be protruding, and correspondingly, the first retaining part 143 can be a recessed structure within the inner wall surface 141 of the soft rubber block 14. Through the mutual snapping of the first retaining part 143 and the second retaining part 302, the motor shaft 301 is better secured.
[0061] Furthermore, the first retaining part 143 and the soft rubber block 14 can be integrally formed, that is, the first retaining part 143 and the soft rubber block 14 are made of the same material and are processed simultaneously. In order to achieve the retaining effect of the first retaining part 143 on the motor shaft 301, the hardness of the first retaining part 143 can be set to be higher than that of the soft rubber block 14.
[0062] In another embodiment, the first retaining part 143 and the soft rubber block 14 can also be processed independently and then assembled together. That is, the first retaining part 143 is formed independently and then embedded into the soft rubber block 14. In order to facilitate better assembly of the first retaining part 143, an embedding groove can be formed at the corresponding position of the soft rubber block 14 for the first retaining part 143 to be installed.
[0063] Furthermore, in conjunction with reference Figure 1 and Figure 6 In one embodiment, the first holding part 143 includes an embedded plate 1431 and a latching part 1432 protruding perpendicularly to the embedded plate 1431. The embedded plate 1431 is embedded in the inner wall surface 141 of the soft rubber block 14, and the latching part 1432 is located outside the inner wall surface 141 of the soft rubber block 14, engaging with the second holding part 302. The embedded plate 1431 better fixes the first holding part 143 in the soft rubber block 14, while the latching part 1432 engages with the second holding part 302, achieving a better holding effect on the motor shaft 301.
[0064] Combined with reference Figure 1 and Figure 7 In another embodiment, the first retaining part 143 is a retaining protrusion provided on the inner wall surface 141 of the soft rubber block 14. The soft rubber block 14 is provided with a blind groove 146, which extends from one end of the soft rubber block to the other end. Moreover, the first retaining part 143 is provided on the side wall of the blind groove 146. After the motor shaft 301 is inserted into the insertion hole 101, it squeezes the blind groove 146, causing the blind groove 146 to deform. After the motor shaft 301 is inserted into place, the blind groove 146 returns to its deformed state, and the retaining protrusion of the first retaining part 143 is retained and fixed with the second retaining part 302 of the motor shaft 301.
[0065] Furthermore, referring to Figure 4 and Figure 5 The soft rubber block 14 also includes a peripheral sidewall 144 connecting the outer wall surface 142 and the inner wall surface 141. The notch 13 includes two opposing second sidewalls 130. When the soft rubber block 14 is embedded in the notch 13, the peripheral sidewall 144 of the soft rubber block 14 and the second sidewall 130 of the notch 13 are mutually engaged and connected.
[0066] Specifically, the soft rubber block 14 has a retaining groove 145 on its peripheral sidewall 144, which extends from the inner wall surface 141 toward the outer wall surface 142; the notch 13 has a retaining block 131 on its second sidewall 130, which extends perpendicular to the cylinder wall 121. When the soft rubber block 14 is assembled into the notch 13, the retaining block 131 is aligned with the retaining groove 145, so that the retaining block 131 enters the retaining groove 145 and slides within the retaining groove 145 until it slides into place, thus fixing the soft rubber block 14 into the notch 13.
[0067] In an alternative embodiment, the aforementioned retaining groove 145 may be disposed on the second sidewall 130 of the notch 13, and the retaining block 131 may be disposed on the peripheral sidewall 144 of the soft rubber block 14.
[0068] Furthermore, the cross-section of the aforementioned retaining block 131 can be an irregular structure such as trapezoidal, circular, square, or triangular, and the cross-section of the slot 145 is consistent with the cross-section of the retaining block 131.
[0069] Furthermore, to enhance the connection between the soft rubber block 14 and the notch 13, the retaining block 131 and the retaining groove 145 can be made to have an interference fit. Since the retaining groove 145 is made of a soft material, when the retaining block 131 enters the retaining groove 145, the retaining groove 145 deforms outward. When the retaining block 131 is fully inserted into the retaining groove 145, the deformation force of the retaining groove 145 compresses the retaining block 131, thereby tightly wrapping the retaining block 131 and making the connection between the soft rubber block 14 and the notch 13 more stable.
[0070] Furthermore, in conjunction with reference Figure 1 and Figure 8 The aforementioned retaining block 131 and retaining groove 145 both extend along the extension direction of the notch 13, that is, along the length direction of the cylinder wall 121. Since the soft rubber block 14 is inserted into the notch 13 and then into the insertion hole 101 of the motor shaft 301, the motor shaft 301 applies a force to the soft rubber block 14 in the direction perpendicular to the cylinder wall 121. Therefore, the retaining block 131 and retaining groove 145 provided in this embodiment can prevent the soft rubber block 14 from being dislodged from the notch 13 due to the force of the motor shaft 301.
[0071] Furthermore, in conjunction with reference Figure 1 , Figure 2 , Figure 9 and Figure 10 The lower end of the motor shaft 301 is cylindrical, and a second retaining part 302 is provided on the circumferential wall of the lower end. The upper end of the motor shaft 301 includes a first flat surface 303, and the opposite side of the first flat surface 303 can be a second flat surface 304. Of course, the second flat surface 304 can also be an arc surface.
[0072] The insertion hole 101 of the brush handle 10 includes a first side wall 102 and a top wall 103. A clearance hole 104 is also provided at the upper end of the top wall 103, meaning the clearance hole 104 is separated from the insertion hole 101 by the top wall 103. The top wall 103 can be flat or inclined. The top wall 103 abuts against the top end of the motor shaft 301. The clearance hole 104 reduces the weight of the toothbrush replacement head and increases the amplitude frequency. Simultaneously, it prevents the toothbrush replacement head from having excessively thick glue layers, thus avoiding appearance defects caused by thermal expansion and contraction during production.
[0073] Combined with reference Figure 1 , Figure 2 , Figure 4 , Figure 9 and Figure 10The brush head 20 includes a brush plate 21 and bristles 22 mounted on the brush plate 21. On the side of the first sidewall 102 closest to the bristles 22, from the second end 12b of the main body 12 towards the first end 12a of the main body 12, a circular arc surface 102a, a guide surface 102b, and a directional surface 102c are sequentially provided. The directional surface 102c abuts against the first flat surface 303 of the motor shaft 301, achieving positioning of the toothbrush replacement head 100 when assembled onto the main unit 300. The side of the first sidewall 102 furthest from the bristles 22 can be entirely circular arc surfaces, or it can consist of a circular arc surface, a guide surface, and a clamping surface that clamps against the second flat surface 304 in sequence.
[0074] Furthermore, the distance between the directional surface 102c and the center line L of the socket is less than the distance between the first flat surface 303 of the motor shaft 301 and the center line L of the socket. Thus, when the motor shaft 301 is installed, an interference fit is formed between the directional surface 102c and the first flat surface 303. The directional surface 102c presses against the first flat surface 303 of the motor shaft 301, generating pressure. This pressure increases the friction between the directional surface 102c and the first flat surface 303, fixing the motor shaft 301 in place and preventing it from easily coming off after installation.
[0075] In one embodiment, the opposite side of the first flat surface 303 on the motor shaft 301 is the second flat surface 304. Since the distance between the first flat surface 303 and the center line L of the socket is smaller than the distance between the second flat surface 304 and the center line L of the socket, when the motor shaft 303 is installed in reverse, the interference distance between the second flat surface 304 and the orientation surface 102c is too large, making it impossible to install the motor shaft 303, thereby avoiding the reverse installation of the motor shaft 303.
[0076] Furthermore, when the motor shaft 301 is installed into the insertion hole 101, a receiving cavity 105 is formed between the second flat surface 304 and the cylindrical wall of the insertion hole 101. Since the motor shaft 301 is made of metal, and metal has the characteristic of elastic deformation, when the first flat surface 303 is subjected to pressure, if the pressure is too high, the metal motor shaft 301 will undergo some slight deformation towards the receiving cavity 105, thereby reducing the pressure; when the pressure disappears, the motor shaft 301 will return to its original shape. Therefore, the receiving cavity 105 has the function of adjusting the pressure tightness, which facilitates the installation and removal of the motor shaft 301.
[0077] The guide surface 102b serves to guide the installation of the motor shaft 301. Specifically, when installing the motor shaft 301, the guide surface 102b guides the first flat surface 303 of the motor shaft 301 to a direction parallel to the orientation surface 102c, so as to facilitate the opposing installation of the motor shaft 301.
[0078] Reference Figure 11The end face 122 of the second end 12b of the body 12 is conical. The end face 122 of the second end 12b includes at least one inclined surface, which in this embodiment is two inclined surfaces: an inner inclined surface near the insertion hole 101 and an outer inclined surface away from the insertion hole 101. Let the plane perpendicular to the axis of the insertion hole be the horizontal plane P0, the angle between the extension plane P2 of the inner inclined surface and the horizontal plane P0 be θ2, and the angle between the extension plane P1 of the outer inclined surface and the horizontal plane P0 be θ1. The values of the included angles θ1 and θ2 are in the range of 1-10°, preferably 5°. Moreover, the included angle θ2 is greater than or equal to the included angle θ1. Since the soft rubber block 14 is installed in the notch 13 after being produced by injection molding, and the end face 122 of the second end 12b of the body 12 is set with an inclined surface during the installation process, it is easier for the soft rubber block 14 to be pressed into the notch 13, thus realizing the installation of the soft rubber block 14.
[0079] Furthermore, in conjunction with reference Figure 4 , Figure 5 and Figure 12 A connecting bridge 132 is provided between the second sidewalls 130 of the notch 13. The outer surface of the connecting bridge 132 is adapted to the inner wall surface 141 of the soft rubber block 14, and the inner surface of the connecting bridge 132 is arc-shaped, with the radius of the arc being equal to the radius of the insertion hole 101. By providing the connecting bridge 132, the length of the notch 13 can be reduced, and the installation stability of the main motor shaft 301 can be improved. Furthermore, the aforementioned first holding part 143 can also be provided on the connecting bridge 132.
[0080] 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, for connection to the main unit (300) of an electric toothbrush; characterized in that, The electric toothbrush replacement head (100) includes a brush handle (10) and a brush head (20) connected to the brush handle (10); the brush handle (10) includes: The body (12) includes a cylindrical wall (121) that is cylindrical in shape. The cylindrical wall (121) includes a first end (12a) and a second end (12b) that are opposite each other. The first end (12a) is connected to the brush head (20). The end face (122) of the second end (12b) is recessed toward the first end (12a) to form an insertion hole (101) for the motor shaft (301) of the host (300) to be fitted into. The cylindrical wall (121) of the body (12) is provided with a notch (13) that extends from the end face (122) of the second end (12b) of the body (12) toward the first end (12a) of the body (12). A soft rubber block (14) is embedded in the notch (13) and is used to abut against the motor shaft (301).
2. The electric toothbrush replacement head as described in claim 1, characterized in that, The soft rubber block (14) includes an inner wall surface (141) embedded in the notch (13), and a first retaining part (143) is provided on the inner wall surface (141), and the first retaining part (143) and the second retaining part (302) on the main motor shaft (301) retain each other.
3. The electric toothbrush replacement head as described in claim 2, characterized in that, The first retaining part (143) is integrally formed with the soft rubber block (14); and / or, of the first retaining part (143) and the second retaining part (302), one is a recess and the other is a buckle.
4. The electric toothbrush replacement head as described in claim 2, characterized in that, The first holding part (143) includes an embedded plate (1431) and a buckle part (1432) protruding perpendicularly from the embedded plate (1431). The embedded plate (1431) is embedded in the inner wall surface (141) of the soft rubber block (14), and the buckle part (1432) is located outside the inner wall surface (141) of the soft rubber block (14) and is held by the second holding part (302).
5. The electric toothbrush replacement head as described in claim 2, characterized in that, The first holding part (143) has a higher hardness than the soft rubber block (14).
6. The electric toothbrush replacement head as described in claim 2, characterized in that, The first holding part (143) is a locking protrusion provided on the inner wall surface (141) of the soft rubber block (14); the soft rubber block (14) is provided with a blind groove (146), which extends from one end of the soft rubber block (14) to the other end; and the first holding part (143) is provided on the side wall of the blind groove (146).
7. The electric toothbrush replacement head as described in claim 1, characterized in that, The soft rubber block (14) includes an inner wall surface (141) and an outer wall surface (142) arranged opposite to each other. After the soft rubber block (14) is embedded in the notch (13), the inner wall surface (141) is coplanar with the inner surface of the insertion hole (101), and / or the outer wall surface (142) is coplanar with the outer surface of the cylinder wall (121).
8. The electric toothbrush replacement head as described in claim 1, characterized in that, The soft rubber block (14) includes an inner wall surface (141) and an outer wall surface (142) disposed opposite to each other, and a peripheral sidewall (144) connecting the inner wall surface (141) and the outer wall surface (142), wherein the peripheral sidewall (144) is mutually engaged with the second sidewall (130) of the notch (13).
9. The electric toothbrush replacement head as described in claim 8, characterized in that, The peripheral sidewall (144) of the soft rubber block (14) and the second sidewall (130) of the notch (13) are provided with a retaining block (131) on one side and a retaining groove (145) corresponding to the retaining block (131) on the other side. The retaining block (131) and the retaining groove (145) retain each other and fix the soft rubber block (14) to the notch (13).
10. The electric toothbrush replacement head as described in claim 9, characterized in that, Both the retaining block (131) and the retaining groove (145) extend along the extension direction of the notch (13).
11. The electric toothbrush replacement head as described in claim 1, characterized in that, The end face (122) of the second end (12b) of the body (12) is inclined on the side away from the socket (101); and / or, the end face (122) of the second end (12b) of the body (12) is inclined on the side close to the socket (101).
12. The electric toothbrush replacement head as described in claim 1, characterized in that, The brush head (20) includes a brush plate (21) and bristles (22) fixed on the brush plate (21); the socket (101) includes a first sidewall (102) and a top wall (103), the first sidewall (102) has an orientation surface (102c) on the side near the bristles (22), the orientation surface (102c) abuts against the first flat surface (303) of the motor shaft (301); the distance between the orientation surface (102c) and the central axis of the socket is less than the distance between the first flat surface (303) and the central axis of the socket.
13. The electric toothbrush replacement head as described in claim 12, characterized in that, The opposite side of the first flat surface (303) on the motor shaft (301) is the second flat surface (304), and the opposite side of the orientation surface (102c) on the first sidewall (102) is an arc surface. A receiving cavity (105) is formed between the opposite side of the orientation surface (102c) on the first sidewall (102) and the second flat surface (304).
14. The electric toothbrush replacement head as described in claim 1, characterized in that, The notch (13) includes two opposing second sidewalls (130), and a connecting bridge (132) is provided between the two second sidewalls (130).
15. An electric toothbrush, characterized in that, The electric toothbrush (1) includes a toothbrush replacement head (100) and a main unit (300), wherein a motor shaft (301) protrudes from the upper end of the main unit (300); the motor shaft (301) is inserted into the toothbrush replacement head (100); the toothbrush replacement head is the toothbrush replacement head as described in any one of claims 1-14.