A brush head and brush head accessory

Abstract

The application discloses a brush head and a brush head accessory, the brush head comprises a brush head main body, a brush head insert and a motor driving shaft, a mounting groove is arranged in the brush head main body, the brush head insert is mounted in the mounting groove, elastic arms and fixed arms are arranged on the brush head insert, a fixing groove is arranged between the elastic arms and the fixed arms, the fixing groove is used for clamping and fixing the motor driving shaft, grooves are formed in the elastic arms and the fixed arms, elastic bodies are embedded in the grooves, the elastic bodies are arranged between the brush head insert and the inner wall of the brush head main body, and the elastic bodies are in interference fit with the inner wall of the brush head main body.

Description

Technical Field

[0001] The present application relates to the technical field of toothbrushes, and in particular to a brush head and brush head accessories. Background Art

[0002] An electric toothbrush is a common cleaning appliance, primarily consisting of a handle and a brush head. The toothbrush head should be replaced regularly during use to ensure effective cleaning and ensure safety. To facilitate installation and removal of the toothbrush head, a brush head insert is installed inside the toothbrush head, connecting it to the motor shaft on the handle. This insert is typically produced through an injection molding process. Repeated insertion and removal of the toothbrush head can easily lead to irreversible deformation of the brush head insert, resulting in loose fit and loud noise. Chinese invention patent CN101902986B discloses a brush head / handle interface for an electric toothbrush. This invention utilizes a spring component to secure the connection between the drive motor shaft and the brush head connecting member during frequent insertion and removal. However, this structural design has certain drawbacks: the tension between the drive motor shaft and the brush head connecting member relies solely on the tensioning force of the spring component material itself. Over long-term use, the spring component ages, causing the tensioning force to decrease. Furthermore, this spring component presents challenges such as inconvenient assembly, difficulty in manufacturing, and high cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a brush head and brush head accessories to solve the deficiencies existing in the above-mentioned technology.

[0004] One advantage of the present invention is that the brush head body and the brush head insert fit tightly together, making insertion and removal easy.

[0005] One advantage of the present invention is that the brush head insert is embedded / filled with an elastomer, which can extend the service life of the brush head insert and reduce the toothbrush noise problem caused by loose parts due to deformation of the brush head insert.

[0006] One advantage of the present invention is that the elastic body can continuously provide a tightening force, so that the connection between the drive motor shaft and the brush head insert is more stable and tight.

[0007] One advantage of the present invention is that the elastomer can compensate for the tolerance of the brush head insert caused by the injection molding process, thereby reducing the noise problem caused by the assembly gap caused by the tolerance problem.

[0008] A brush head and brush head accessories, the brush head comprising a brush head body, a brush head insert and a motor drive shaft, a mounting groove being provided in the brush head body, the brush head insert being installed in the mounting groove, an elastic arm and a fixed arm being provided on the brush head insert, a fixing groove being provided between the elastic arm and the fixed arm, the fixing groove being used for clamping and fixing the motor drive shaft, a groove being provided on both the elastic arm and the fixed arm, the groove being embedded / filled with an elastomer, the elastomer being provided between the brush head insert and the inner wall of the brush head body, the elastomer being interference fit with the inner wall of the brush head body.

[0009] In at least one embodiment, the interference between the elastic body and the inner wall of the brush head body is preferably 0.3-0.5 mm.

[0010] In at least one embodiment, the elastic arm is further provided with an abutment portion, which is a protrusion facing the fixed groove, and the inner wall of the brush head body has an inner wall protrusion, which is a protrusion facing the groove, and the abutment portion and the inner wall protrusion can elastically abut with the motor drive shaft and the elastomer respectively.

[0011] In at least one embodiment, both sides of the elastic arm are hollow, so that when squeezed by the drive motor shaft, the elastic arm can be deformed to ensure that the drive shaft can be stably clamped in the fixing groove.

[0012] In at least one embodiment, the brush head insert includes an insert top and an insert bottom, the insert top includes a cross positioning portion, the inner side of the mounting groove has a cross-shaped groove corresponding to the cross positioning portion, and the cross positioning portion is used to quickly locate the installation position of the brush head insert in the mounting groove.

[0013] In at least one embodiment, a first boss and a second boss parallel to the elastic arm are provided on the outer wall of the cross positioning portion, and the first boss and the second boss are elastic.

[0014] In at least one embodiment, a limiting portion is provided below the cross positioning portion, and the limiting portion abuts against the top of the motor drive shaft.

[0015] In at least one embodiment, the bottom end of the insert further includes an insert base, and a first fixing bar and a second fixing bar are provided on both sides of the insert base, and the first fixing bar and the second fixing bar are in the shape of raised bars.

[0016] In at least one embodiment, the motor drive shaft also includes a first recess, and the brush head insert also includes a free arm, one end of the free arm is connected to the fixed arm, and the other end is a free end, and the free end also includes a clamping portion, which is a protrusion facing the fixed groove, and the clamping portion is clamped with the first recess on the motor shaft.

[0017] In at least one embodiment, the motor drive shaft includes a first abutting surface abutting against the elastic arm, and an area of ​​the first abutting surface is larger than an area of ​​the elastic arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a brush head and brush head accessories according to an embodiment of the present application is shown;

[0019] Figure 2 A side view of a brush head insert of a brush head and a brush head accessory according to an embodiment of the present application is shown;

[0020] Figure 3 A three-dimensional view of a brush head insert of a brush head and a brush head accessory according to an embodiment of the present application is shown;

[0021] Figure 4 A cross-sectional schematic diagram of the brush head and brush head accessories is shown with the drive motor shaft in an "uninserted" state;

[0022] Figure 5 A cross-sectional schematic diagram of the brush head and brush head accessories is shown with the drive motor shaft in an "inserted" state;

[0023] Figure 6 A top view of a brush head and brush head accessories according to an embodiment of the present application is shown;

[0024] Figure 7 A bottom view of a brush head and brush head accessories according to an embodiment of the present application is shown;

[0025] 1-brush head body; 10-brush end; 11-connection end; 12-inner wall protrusion; 100-installation slot;

[0026] 2-brush head insert; 20-elastic arm; 21-fixed arm; 22-free arm; 23-reinforcement arm; 200-fixed slot;

[0027] 201 - abutment portion; 210 - groove; 211 - elastic body; 212 - top end of insert; 213 - bottom end of insert; 220 - free end; 2120 - cross positioning portion; 2121 - cross groove; 2122 - first boss; 2123 - second boss; 2124 - limiting portion; 2130 - insert base; 2131 - first fixing bar; 2132 - second fixing bar; 2201 - clamping portion;

[0028] 3-motor drive shaft; 30-first abutting surface; 31-first recess. Implementation Method

[0029] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, this section describes in detail the specific embodiments of the present application in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions. Therefore, the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application shall be based on the claims.

[0030] Reference Figure 1-Figure 7 The brush head includes a brush head body 1 and a brush head insert 2. The brush head body 1 has opposite bristle ends 10 and a connecting end 11. A mounting groove 100 is provided in the brush head body 1, and the brush head insert 2 is installed in the mounting groove 110.

[0031] Reference Figure 2-Figure 3 The brush head insert 2 is provided with an elastic arm 20 and a fixed arm 21. A fixing groove 200 is defined between the elastic arm 20 and the fixed arm 21. The fixing groove 112 is used to clamp and fix the motor drive shaft 3. A groove 210 is defined on both the elastic arm 20 and the fixed arm 21. An elastic body 211 is embedded or filled in the groove 210. The elastic body 211 is disposed between the brush head insert 2 and the inner wall of the brush head body 1. The elastic body 211 has an interference fit with the inner wall of the brush head body 1.

[0032] Reference Figure 5 When the motor drive shaft 3 is inserted into the fixing groove 200, the elastic arm 20 is deformed and compresses the elastic body 211 to deform. The elastic body 211 is squeezed by the inner wall of the brush head body 1 and applies a reaction force to the elastic arm 20, and applies a reaction force to the motor drive shaft 3 through the elastic arm 20, thereby clamping and fixing the motor drive shaft 3 in the fixing groove 200.

[0033] In this embodiment, the elastic arm 20 is further provided with an abutment portion 201, and the inner wall protrusion 12 is provided on the inner wall of the brush head body 1. The abutment portion 201 is a protrusion facing the fixing groove 200, and the inner wall protrusion 12 is a protrusion facing the installation groove. The abutment portion 201 can elastically abut against the motor drive shaft 3, and the inner wall protrusion 12 can elastically abut against the elastomer 211. In addition, since the elastic body 211 itself has a tightening function, the elastic body 211 can apply a tightening force to the elastic arm. At the same time, since the elastic body 211 and the inner wall protrusion 12 have an interference fit, the inner wall protrusion 12 applies a corresponding reaction force to the elastic body 211 to maintain the tightening force of the elastic body 211. The dual combination of the above two structures can better maintain the tightening force of the elastic body 211, so that the elastic body 211 can continuously output the tightening force to the elastic arm 20. The elastic body 211 is not prone to failure, so that the motor drive shaft 3 can still maintain a tight connection with the brush head insert 2 after multiple plugging and unplugging, thereby avoiding abnormal noise caused by loosening between the motor drive shaft 3 and the brush head insert 2. The elastic body 211 can also slow down the irreversible deformation of the elastic arm 20 caused by multiple plugging and unplugging, extend the service life of the brush head insert 2, and reduce the noise caused by loose assembly due to deformation of parts.

[0034] It is understandable that, because the size of the fixing groove 200 is generally compatible with the motor drive shaft 3 on the toothbrush handle, when the motor drive shaft 3 is inserted into the fixing groove 200, it will squeeze the elastic arm 20 and cause the elastic arm 20 to undergo elastic deformation. While undergoing elastic deformation, the elastic arm 20 will apply a reverse force to the motor drive shaft 3 through the abutment portion 201, thereby stably clamping the motor drive shaft 3 in the fixing groove 200, thereby achieving a stable connection between the toothbrush head body 1 and the toothbrush handle. Because the motor drive shaft 3 is elastically clamped in the fixing groove 200, when the brush head needs to be removed from the toothbrush handle, it only needs to be pulled out with force, which is very convenient and quick.

[0035] Reference Figure 4-Figure 5When the motor drive shaft 3 is not inserted into the fixing slot 200, the interference between the elastic body 211 and the inner wall of the brush head body 1 is preferably 0.3-0.5mm. This interference provides a pre-support or pre-interference effect, ensuring that the inner wall of the brush head body 1 always exerts a compressive force on the elastic body 211, thereby strengthening the elastic body 211 and preventing the tightening force of the elastic body 211 from being reduced. When the drive motor shaft 3 is fully inserted into the fixing slot 200, due to the thickness of the abutment portion 201, the interference between the elastic body 211 and the inner wall of the brush head body 1 is preferably the sum of (0.3-0.5mm) and the thickness of the abutment portion 201. If the interference is too large, the motor drive shaft 3 and the brush head insert 2 may become too tight, making it difficult to insert and remove the motor drive shaft 3 and easily damaging the brush head insert 2. If the interference is too small, the elastic body 211 cannot effectively support and tighten the elastic arm 20.

[0036] The elastomer 211 in this embodiment is a flexible silicone ring. The silicone material has the characteristics of wear resistance, high temperature resistance, non-toxicity, odorlessness, and good elasticity. Therefore, after the motor drive shaft 3 is plugged and unplugged many times, since the elastomer 211 itself has good elasticity and the inner wall protrusion 12 continues to apply force to the elastomer 211, the elastic arm 20 can always remain tightly connected with the motor drive shaft 3.

[0037] Of course, the elastomer 211 can be in various forms. For example, the elastomer 211 can also be an elastic material embedded in the brush head insert 2. The elastic material can be integrally formed with the brush head insert 2. The specific setting can be based on actual conditions, and this application does not impose any specific restrictions on it.

[0038] In this embodiment, a groove 210 is provided on the brush head insert 2, and the elastic body 211 is a flexible silicone ring. The flexible silicone ring can be easily put on the groove 210, and is simple to operate and easy to produce.

[0039] Since the brush head insert 2 is generally obtained by an injection molding process, the elastic body 211 can also compensate for the manufacturing error of the brush head insert 2 and reduce the noise problem caused by the assembly gap caused by the tolerance problem.

[0040] Specifically, when the brush head needs to be replaced, one only needs to hold the handle and apply force to the brush head to pull it out. During the plugging and unplugging process, due to the deformation and positioning of the elastic arm 20, the brush head and the handle can be quickly separated and connected.

[0041] The elastic arm 20 has a hollow design on both sides, which facilitates the deformation of the elastic arm 20 when squeezed by the motor drive shaft 3, so as to ensure that the motor drive shaft 3 can be easily clamped in the fixing groove 200 or removed from the fixing groove 200.

[0042] The brush head insert 2 includes an insert top 212 and an insert bottom 213. The insert top 212 includes a cross-shaped positioning portion 2120. The mounting groove 100 has a cross-shaped groove 2121 corresponding to the cross-shaped positioning portion 2120. The cross-shaped positioning portion 2120 is used to quickly locate the clamping position of the brush head insert 2 in the mounting groove 100. When the cross-shaped positioning portion 2120 and the cross-shaped groove 2121 are arranged opposite each other, the brush head insert 2 can be smoothly inserted into the mounting groove 100 for fixation. The cross-shaped positioning portion 2120 has a smaller cross-sectional area and the force is more concentrated, which is conducive to a tighter connection between the brush head insert 2 and the brush head body 1 and is not easy to loosen.

[0043] Reference Figure 3 and Figure 4 The bottom end 213 of the insert also includes an insert base 2130. The insert base 2130 has a first fixing strip 2131 and a second fixing strip 2132 on both sides. The first fixing strip 2131 and the second fixing strip 2132 are in the shape of raised strips. The first fixing strip 2131 and the second fixing strip 2132 are engaged with the inner wall of the brush head body 1 to prevent the brush head insert 2 from deflecting and moving. Of course, it can also be set that a protrusion is provided on the inner side of the brush head body 1 and the insert base 2130 is provided with a groove. The specific setting can be made according to actual needs. For the stability of the clamping, there are at least two fixing strips, and they are arranged at intervals along the circumferential direction of the brush head body 1. It can be understood that the combination of the protrusion and the groove greatly facilitates the assembly and disassembly of the brush head insert 2 on the toothbrush head body 1.

[0044] Reference Figure 3 A triangular reinforcement arm 23 is further provided between the insert base 2130 and the elastic arm 20. The reinforcement arm 23 is used to enhance the stability of the brush head insert 2, preventing deformation of the brush head insert 2. The number of reinforcement arms 23 can be multiple, depending on the actual structure, and is not specifically limited in this application.

[0045] The insert bottom end 213 and the connecting end 11 of the brush head body 1 are fixed by ultrasonic welding, so that the connection between the brush head body 1 and the brush head insert 2 is more stable.

[0046] Reference Figure 4The motor drive shaft 3 includes a first abutting surface 30 abutting against the elastic arm 20. The first abutting surface 30 is a semicircular arc-shaped side of the motor drive shaft 3. The area of ​​the first abutting surface 30 is larger than the area of ​​the elastic arm 20 to ensure sufficient abutting contact area, ensuring that the elastic arm 20 can tightly abut against the motor drive shaft 3, and further ensuring the stability of the motor drive shaft 3 in the fixing groove 200.

[0047] The drive motor shaft 3 includes a first recess 31, and the brush head insert 2 also includes a free arm 22. One end of the free arm 22 is connected to the fixed arm 21, and the other end is a free end 220. The free end 220 also includes a clamping portion 2201, and the clamping portion 2201 is a protrusion facing the fixed groove 220. The clamping portion 2201 is clamped with the first recess 31 on the drive motor shaft 3 so as to better fix the motor drive shaft 3 to the fixed groove 200.

[0048] It can be understood that when the motor drive shaft 3 is fully inserted into the fixing groove 220, the clamping portion 2201 and the first recess 31 of the motor drive shaft 3 are clamped and a "click" sound is emitted, reminding the user that the motor drive shaft 3 and the brush head are connected in place and the toothbrush can be started for oral cleaning.

[0049] A limiting portion 2124 is provided below the cross positioning portion 2120 . The limiting portion 2124 abuts against the top of the motor drive shaft 3 . The limiting portion 2124 limits the depth of the motor drive shaft 3 inserted into the fixing groove 200 .

[0050] The outer wall of the cross positioning portion 2120 is provided with a first boss 2122 and a second boss 2123 parallel to the elastic arm 20. The first boss 2122 and the second boss 2123 are elastic. The first boss 2122 and the second boss 2123 abut against the inner wall of the brush head body 1. The above structure makes the connection of the brush head insert 2 in the mounting groove 100 more stable, thereby further reducing abnormal noise caused by loose accessories during the operation of the toothbrush head.

[0051] The present invention provides an electric toothbrush, comprising a brush head and a handle (not shown in the figure), wherein the handle has a motor drive shaft 3, and the brush head is detachably connected to the handle via the motor drive shaft 3.

[0052] In summary, in the electric toothbrush of the embodiment of the present application, the brush head insert 2 is installed in the installation groove 100 in the brush head body 1. The brush head insert 2 has an elastic arm 20 and a fixed arm 21. A fixed groove 200 is defined between the elastic arm 20 and the fixed arm 21. The drive motor shaft 3 is inserted into the fixed groove 200, making it easy to assemble and disassemble the toothbrush head. The brush head insert 2 is provided with an elastic body 211, which is interference fit between the inner wall of the brush head body 1 and the brush head insert 2. The elastic body 211 can reduce the irreversible deformation of the elastic arm 20 caused by repeated plugging and unplugging, thereby extending the service life of the brush head insert 2, thereby preventing loosening between the motor drive shaft 3 and the brush head insert 2, and reducing the noise generated when the electric toothbrush is in operation. In addition, the elastic body 211 itself has a certain tightening force, which can act on the elastic arm 20, and because the inner wall protrusion 12 continuously applies a reaction force to the elastic body 211, this structure can maintain the tightening force of the elastic body 211, avoiding the tightening force of the elastic body 211 from being reduced or failing after multiple plugging and unplugging, so as to ensure that the motor drive shaft 3 can be stably fixed in the fixing groove.

[0053] In this application, unless otherwise expressly specified or limited, terms such as "install," "assemble," "connect," "connect," "link," "join," "abut," "communicate," "intercommunicate," "connect," "fix," and "fasten" are to be understood broadly, for example, and may refer to direct or indirect connections. For example, a connection may be a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or internal communication between two components or an interaction between two components, unless otherwise expressly specified or limited. For example, communication / conduction may be direct communication / conduction or indirect communication / conduction through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. In this application, unless otherwise expressly specified or limited, a component being disposed / installed / located / accommodated / placed within, within, or inside another component may refer to either: a portion or a majority of the component being located within the other component; or the component being completely accommodated within the other component. While the present application has been described in detail using the above-described embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as modified embodiments without departing from the subject matter and scope of the present application as defined by the claims. Therefore, the descriptions in this specification are for illustrative purposes only and do not have any limiting meaning with respect to the present application.

Claims

1. A brush head and brush head accessories, characterized in that: The brush head includes a brush head body, a brush head insert and a motor drive shaft, a mounting groove is provided in the brush head body, the brush head insert is installed in the mounting groove, an elastic arm and a fixed arm are provided on the brush head insert, a fixing groove is provided between the elastic arm and the fixed arm, the fixing groove is used to clamp and fix the motor drive shaft, the elastic arm and the fixed arm are both provided with a groove, an elastomer is embedded in the groove, the elastomer is provided between the brush head insert and the inner wall of the brush head body, the groove extends in the circumferential direction of the brush head insert, the elastomer is a flexible silicone ring, and the elastomer is interference fit with the inner wall of the brush head body, The interference between the elastic body and the inner wall of the brush head body is 0.3-0.5mm. The elastic arm is also provided with an abutment portion, which is a protrusion facing the fixed groove. The inner wall of the brush head body has an inner wall protrusion, which is a protrusion facing the groove. The abutment portion and the inner wall protrusion can elastically abut with the motor drive shaft and the elastomer respectively.

2. A brush head and brush head accessories according to claim 1, characterized in that: Both sides of the elastic arm are hollow in design, so that when squeezed by the motor drive shaft, the elastic arm can be deformed to ensure that the drive shaft can be stably clamped in the fixing groove.

3. A brush head and brush head accessories according to claim 1, characterized in that: The brush head insert includes an insert top and an insert bottom, the insert top includes a cross positioning portion, the inner side of the mounting groove has a cross-shaped groove corresponding to the cross positioning portion, and the cross positioning portion is used to quickly locate the installation position of the brush head insert in the mounting groove.

4. A brush head and brush head accessories according to claim 3, characterized in that: A first boss and a second boss parallel to the elastic arm are provided on the outer wall of the cross positioning portion, and the first boss and the second boss are elastic.

5. A brush head and brush head accessories according to claim 4, characterized in that: A limiting portion is provided below the cross positioning portion, and the limiting portion abuts against the top of the motor drive shaft.

6. A brush head and brush head accessories according to claim 1, characterized in that: The bottom end of the insert also includes an insert base. A first fixing strip and a second fixing strip are provided on both sides of the insert base. The first fixing strip and the second fixing strip are in the shape of raised strips.

7. A brush head and brush head accessories according to claim 1, characterized in that: The motor drive shaft also includes a first recess, and the brush head insert also includes a free arm, one end of the free arm is connected to the fixed arm, and the other end is a free end. The free end also includes a clamping portion, which is a protrusion facing the fixed groove, and the clamping portion is clamped with the first recess on the motor shaft.

8. A brush head and brush head accessories according to claim 7, characterized in that: The motor drive shaft includes a first abutting surface abutting against the elastic arm, and an area of ​​the first abutting surface is larger than an area of ​​the elastic arm.

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