Toothbrush head connecting structure of electric toothbrush
By employing a first spring arm, a second spring arm, and a cantilever design in the toothbrush head connection structure, and utilizing interference fit and locking structure, the problem of loosening or over-tightening caused by dimensional tolerances is solved, achieving a stable connection between the toothbrush head and the motor shaft.
Patent Information
- Application Number
- CN202520142617.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-21
AI Technical Summary
Due to dimensional tolerances, the brush head connection structure of existing electric toothbrushes may become loose or too tight, affecting the performance.
The toothbrush head connection structure, which includes the connecting body, is designed with a first spring arm, a second spring arm, and a cantilever arm. The interference fit of the first and second protrusions, along with the engagement of the hook and the slot, absorbs the dimensional tolerance of the parts and improves the controllability of the insertion and extraction force.
It effectively absorbs the dimensional tolerances of parts, improves the problem of difficult-to-control insertion and extraction force, and ensures a stable connection between the toothbrush head and the motor shaft.
Smart Images
Figure CN223622046U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of electric toothbrush technology and relates to a toothbrush head connection structure for an electric toothbrush. Background Technology
[0002] In the process of realizing this invention, the inventors discovered that the prior art has at least the following problems: when the brush head of an existing electric toothbrush is connected to the motor shaft, due to dimensional tolerance issues, it may become loose or too tight, affecting the normal use of the toothbrush.
[0003] Therefore, how to provide a toothbrush head connection structure for electric toothbrushes to improve the difficulty in controlling the insertion and extraction force has become an urgent technical problem to be solved. Utility Model Content
[0004] To overcome the problems existing in the related technologies, this application aims to provide a toothbrush head connection structure for an electric toothbrush that can improve the problem of difficulty in controlling the insertion and extraction force.
[0005] This application is achieved through the following technical solution.
[0006] This technical solution provides a toothbrush head connection structure for connecting a toothbrush head and a motor shaft. The structure includes a connecting body, which has a socket for inserting into the motor shaft. The side of the socket has a first spring arm for abutting against the motor shaft and a cantilever arm for locking the motor shaft. The first spring arm and the cantilever arm are arranged opposite to each other to limit the motor shaft.
[0007] Both ends of the first elastic arm are fixed to the connecting body, the first end of the cantilever is fixed to the connecting body, and the second end of the cantilever is a movable end with a hook.
[0008] The present invention is further configured such that the first elastic arm has an abutment surface that abuts against the motor shaft, and the abutment surface has a first protrusion.
[0009] The present invention is further configured such that a second spring arm is provided on the side of the socket for abutting against the motor shaft. The second spring arm is located on the same side of the cantilever and is disposed away from the socket opening relative to the cantilever, so as to form an alignment with the first spring arm.
[0010] The present invention is further configured such that the second elastic arm has an abutment surface that abuts against the motor shaft, and the abutment surface has a second protrusion that cooperates with the first protrusion to limit the motor shaft, and the first protrusion and the second protrusion are arranged opposite to each other.
[0011] The present invention is further configured such that the motor shaft is provided with a first limiting surface, the side of the insertion hole is provided with a second limiting surface, and the second protrusion is formed on the second limiting surface and the abutment surface.
[0012] The present invention is further configured such that the end of the first protrusion facing the opening of the socket is provided with an arc-shaped guide surface.
[0013] The present invention is further configured such that the end of the second protrusion facing the opening of the socket has an arc-shaped guide surface.
[0014] The present invention is further configured such that a groove is provided on the back side of the first elastic arm relative to the first protrusion to assist the first elastic arm in elastic deformation, and the length of the groove is equal to or greater than the length of the first protrusion.
[0015] The present invention is further configured such that the connecting body is provided with a first slot and a third slot on both sides of the first elastic arm and the second elastic arm, respectively, and the connecting body is provided with a second slot on the outer side of the movable end of the cantilever.
[0016] The present invention is further configured such that the motor shaft is provided with a slot, and the hook cooperates with the slot.
[0017] The above technical solution has the following technical effects: by providing a connecting body with a first spring arm, a second spring arm, and a cantilever, an interference fit is formed with the motor shaft to absorb the dimensional tolerance of the parts and improve the problem of difficult control of insertion and extraction force.
[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0019] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.
[0020] Figure 1 This is a cross-sectional view of the connection body shown in one embodiment of this application;
[0021] Figure 2 This is a schematic diagram of the connection body structure shown in one embodiment of this application;
[0022] Figure 3 This is a positional relationship diagram shown in one embodiment of this application;
[0023] Figure 4 This is a cross-sectional view shown in one embodiment of this application;
[0024] Figure 5This is a schematic diagram of the motor shaft structure shown in one embodiment of this application.
[0025] Reference numerals in the attached drawings: 1. Connecting body; 2. First spring arm; 21. First slot; 22. Second spring arm; 23. Third slot; 3. Cantilever; 31. Second slot; 4. First limiting surface; 5. Second limiting surface; 6. First protrusion; 7. Second protrusion; 8. Slot; 9. Hook; 10. Toothbrush head; 11. Motor shaft. Detailed Implementation
[0026] The technical solutions of some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.
[0028] This utility model discloses a toothbrush head connection structure for an electric toothbrush, such as... Figures 1-4 As shown, the toothbrush head 10 and the motor shaft 11 are connected by a connecting body 1. The connecting body 1 is provided with a socket for inserting into the motor shaft 11. The side of the socket is provided with a first spring arm 2 for abutting against the motor shaft 11 and a cantilever arm 3 for locking the motor shaft 11. The first spring arm 2 and the cantilever arm 3 are arranged opposite to each other to limit the motor shaft 11.
[0029] Both ends of the first elastic arm 2 are fixed to the connecting body 1, the first end of the cantilever 3 is fixed to the connecting body 1, and the second end of the cantilever 3 is a movable end with a hook 9.
[0030] It should be noted that the connecting body 1 includes a first spring arm 2 and a second spring arm 22 for abutting against the motor shaft 11, and a cantilever 3 for engaging the motor shaft 11. The first spring arm 2 and the second spring arm 22 are arranged opposite to each other to form an engaged state. At the same time, the first protrusion 6 provided on the first spring arm 2 can move with the first spring arm 2. The first protrusion 6 and the second protrusion 7 can form an interference fit with the step provided on the motor shaft 11. The hook 9 provided on the movable end of the cantilever 3 can engage with the slot provided on the motor shaft 11, thereby achieving two points of movable limit to absorb the dimensional tolerance of the parts and improve the problem of difficult control of insertion and extraction force.
[0031] like Figure 4 As shown, the first spring arm 2 has a contact surface that abuts against the motor shaft 11, and a first protrusion 6 is provided on the contact surface.
[0032] like Figure 1 and Figure 4As shown, the side of the socket is provided with a second spring arm 22 for abutting against the motor shaft 11. The second spring arm 22 is located on the same side of the cantilever 3, and the second spring arm 22 is positioned away from the socket opening relative to the cantilever 3 to form an alignment with the first spring arm 2.
[0033] like Figure 1 and Figure 3 As shown, the second spring arm 22 has a contact surface that abuts against the motor shaft 11. The contact surface has a second protrusion 7 that cooperates with the first protrusion 6 to limit the movement of the motor shaft 11. The first protrusion 6 and the second protrusion 7 are arranged opposite to each other.
[0034] like Figure 1 and Figure 5 As shown, the motor shaft 11 is provided with a first limiting surface 4, the side of the insertion hole is provided with a second limiting surface 5, and a second protrusion 7 is formed on the second limiting surface 5 and the contact surface.
[0035] It should be noted that the first limiting surface 4 of the motor shaft 11 abuts against the second protrusion 7 on the second limiting surface 5. The second protrusion 7 and the first protrusion 6 form an interference fit to limit the motor shaft 11, thereby limiting the motor shaft 11.
[0036] like Figure 4 As shown, the end of the first protrusion 6 facing the opening of the socket has an arc-shaped guide surface.
[0037] like Figure 1 As shown, the end of the second protrusion 7 facing the socket opening has an arc-shaped guide surface.
[0038] like Figures 1-5 As shown, the first elastic arm 2 has a groove on the back side relative to the first protrusion 6 to assist the first elastic arm 2 in elastic deformation, and the length of the groove is equal to or greater than the length of the first protrusion 6.
[0039] It should be noted that when the motor shaft 11 is inserted into the toothbrush head 10, it passes through the cantilever 3 and reaches the first spring arm 2 and the second spring arm 22. First, it passes through the first protrusion 6 and the second protrusion 7 at the end facing the insertion hole, and then engages between the two. The first protrusion 6 can adjust its position within a certain distance as the first spring arm 2 cooperates with the insertion of the motor shaft 11 to form an elastic deformation, and then together with the second protrusion 7, it squeezes the motor shaft 11 to form a limit.
[0040] like Figure 1 As shown, the connecting body 1 has a first slot 21 and a third slot 23 on both sides of the first spring arm 2 and the second spring arm 22, respectively, and a second slot 31 on the outer side of the movable end of the cantilever 3.
[0041] like Figure 5 As shown, the motor shaft 11 is provided with a slot 8, and the hook 9 cooperates with the slot 8.
[0042] Working principle: The hook 9 on the cantilever 3 engages with the slot 8 on the motor shaft 11 to form a locking state. The first protrusion 6 on the first spring arm 2 on one side of the motor shaft 11 moves with the first spring arm 2 and engages with the second protrusion 7 on the second spring arm 22 on the other side of the motor shaft. This allows the first protrusion 6 and the second protrusion 7 to form an interference fit with the motor shaft 11, thereby achieving two points of movable limit to absorb the dimensional tolerance of the parts and improve the problem of difficult insertion and extraction force control.
[0043] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A toothbrush head connection structure for an electric toothbrush, used to connect a toothbrush head (10) and a motor shaft (11), characterized in that, The device includes a connecting body (1), which has a socket for inserting into the motor shaft (11). The side of the socket has a first spring arm (2) for abutting against the motor shaft (11) and a cantilever arm (3) for locking the motor shaft (11). The first spring arm (2) and the cantilever arm (3) are arranged opposite to each other to limit the motor shaft (11). The two ends of the first elastic arm (2) are fixed to the connecting body (1), the first end of the cantilever (3) is fixed to the connecting body (1), and the second end of the cantilever (3) is a movable end with a hook (9).
2. The toothbrush head connection structure of the electric toothbrush according to claim 1, characterized in that, The first spring arm (2) is provided with a contact surface that abuts against the motor shaft (11), and a first protrusion (6) is provided on the contact surface.
3. The toothbrush head connection structure of the electric toothbrush according to claim 1, characterized in that, The side of the socket is provided with a second spring arm (22) for abutting against the motor shaft (11). The second spring arm (22) is located on the same side of the cantilever (3), and the second spring arm (22) is located away from the socket opening relative to the cantilever (3) to form an alignment with the first spring arm (2).
4. The toothbrush head connection structure of the electric toothbrush according to claim 3, characterized in that, The second spring arm (22) is provided with a contact surface that abuts against the motor shaft (11). The contact surface is provided with a second protrusion (7) that cooperates with the first protrusion (6) to limit the motor shaft (11). The first protrusion (6) and the second protrusion (7) are arranged opposite to each other.
5. The toothbrush head connection structure of the electric toothbrush according to claim 4, characterized in that, The motor shaft (11) is provided with a first limiting surface (4), and the side of the insertion hole is provided with a second limiting surface (5). The second protrusion (7) is formed on the second limiting surface (5) and the contact surface.
6. The toothbrush head connection structure of the electric toothbrush according to claim 2, characterized in that, The first protrusion (6) has an arc-shaped guide surface at one end facing the opening of the socket.
7. The toothbrush head connection structure of the electric toothbrush according to claim 4, characterized in that, The second protrusion (7) has an arc-shaped guide surface at one end facing the opening of the socket.
8. The toothbrush head connection structure of the electric toothbrush according to claim 2, characterized in that, The first elastic arm (2) has a groove on the back side of the first protrusion (6) to assist the first elastic arm (2) in elastic deformation. The length of the groove is equal to or greater than the length of the first protrusion (6).
9. The toothbrush head connection structure of the electric toothbrush according to claim 1, characterized in that, The connecting body (1) is provided with a first slot (21) and a third slot (23) on both sides of the first elastic arm (2) and the second elastic arm (22), respectively. The connecting body (1) is provided with a second slot (31) on the outer side of the movable end of the cantilever (3).
10. The toothbrush head connection structure of the electric toothbrush according to claim 1, characterized in that, The motor shaft (11) is provided with a slot (8), and the hook (9) cooperates with the slot (8).