Electric toothbrush

Abstract

The utility model discloses an electric toothbrush which comprises a brush head and a handle, and a circuit board, a trigger support, a transmission shaft, a shaft support, a mounting support, a machine core assembly and a trigger switch are arranged in the handle, and the machine core assembly and the trigger switch are electrically connected with the circuit board. The circuit board and the shaft support are both installed on the installation support, and the trigger support and the shaft support are respectively fixed at two opposite ends of the machine core assembly. One end of the transmission shaft penetrates through the shaft support, extends to the outer side of the handle and is connected with the brush head, the other end of the transmission shaft is connected with the machine core assembly, and the trigger switch is arranged on the circuit board. The shaft support is used as a fulcrum, the lever principle is used, and when the brush head is pressed, the trigger support can be driven to move in the direction close to the trigger switch through the transmission shaft, the shaft support and the machine core assembly. When the pressure borne by the brush head exceeds a certain value, the trigger support can trigger the switch to achieve the effect of detecting the pressure borne by the brush head, the structure is simple, the cost of the electric toothbrush can be effectively reduced, and the load of the motor cannot be increased.

Description

Technical Field

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

[0002] As we all know, electric toothbrushes can be divided into sonic electric toothbrushes and rotary electric toothbrushes. Electric toothbrushes use a motor to rapidly rotate or vibrate, causing the brush head to rotate or vibrate at high frequencies, breaking down toothpaste into fine foam that deeply cleans between teeth. During the use of an electric toothbrush, if the brushing pressure is too low, it can lead to low cleaning efficiency and poor cleaning effect. If the brushing pressure is too high, it can easily damage the gums. Therefore, controlling the brushing pressure of an electric toothbrush is very important.

[0003] In existing technology, most electric toothbrushes use pressure sensors to detect the user's brushing pressure. These pressure sensors typically employ measurement principles such as strain gauges, capacitors, and sensing chips. When the user applies pressure while brushing, the sensor on the toothbrush detects the pressure change and transmits the signal to the control chip. The control chip then uses the collected signals to remind the user to use the electric toothbrush correctly. Because these pressure sensors incorporate strain gauges, capacitors, and sensing chips, their complex assembly and high electronic costs contribute to the high price of the toothbrush, increasing the purchase cost for consumers.

[0004] Furthermore, existing rotary electric toothbrushes typically integrate the drive shaft and driven gear connected to the brush head into a single unit. When brushing, pressure is applied to the drive shaft, and a pressure sensor is triggered when a certain pressure is reached, thus alerting the user. However, applying pressure to the drive shaft can affect the movement of the driven gear, increasing the load on the electric toothbrush and increasing battery consumption. This results in shorter battery life, increased noise, and a shortened lifespan for the driven gear. Utility Model Content

[0005] The main purpose of this utility model is to provide an electric toothbrush that solves the problems of increased cost due to the complex pressure detection structure of existing electric toothbrushes, as well as the problems of increased load affecting battery life and gear lifespan caused by the pressure detection structure of existing rotary electric toothbrushes.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] An electric toothbrush includes a brush head and a handle. The handle contains a circuit board, a trigger bracket, a drive shaft, a shaft bracket, a mounting bracket, a core assembly electrically connected to the circuit board, and a trigger switch. The core assembly is used to drive the drive shaft to swing back and forth when driven by the circuit board.

[0008] The circuit board and shaft bracket are both mounted on the mounting bracket. The trigger bracket and shaft bracket respectively fix the opposite ends of the mechanism assembly. One end of the drive shaft passes through the shaft bracket and extends to the outside of the handle and connects to the brush head. The other end of the drive shaft is connected to the mechanism assembly. The trigger switch is mounted on the circuit board.

[0009] The drive shaft is used to transmit the pressure on the brush head to the shaft support. When the shaft support is under pressure, it drives the trigger bracket to move through the core assembly to trigger the trigger switch.

[0010] Furthermore, the trigger bracket includes a trigger post disposed at the end of the core assembly away from the brush head, and the trigger post is positioned corresponding to the trigger switch.

[0011] Furthermore, the distance between the trigger post and the trigger switch is 0.2-0.5 mm.

[0012] Furthermore, the trigger bracket also includes a fixing plate, a connecting plate, and a trigger post disposed on the fixing plate. The fixing plate is disposed at the end of the mechanism assembly away from the brush head, the connecting plate is disposed on the fixing plate, and the trigger post is disposed on the connecting plate.

[0013] The electric toothbrush also includes an adapter plate and conductive wires. The adapter plate is located at the end of the fixed plate away from the brush head. The motor assembly is provided with a power terminal at the end away from the brush head. The fixed plate is provided with a first clearance hole for avoiding the power terminal. The power terminal passes through the first clearance hole and is welded to the adapter plate.

[0014] The fixing plate has a first clearance cavity at the end away from the brush head, and the adapter plate has a second clearance hole communicating with the second clearance cavity. One end of the conductive wire is soldered to the adapter plate, and part of the conductive wire is placed in the first clearance cavity. The other end of the conductive wire passes through the second clearance hole and is electrically connected to the circuit board. The adapter plate has a third clearance hole for avoiding the connecting plate, and the trigger post is located at the end of the adapter plate away from the brush head.

[0015] Furthermore, the mounting bracket has limit holes on both sides, and the shaft bracket has limit parts on both sides, with the limit parts placed inside the limit holes.

[0016] Furthermore, the mounting bracket has two spaced support columns protruding at one end near the brush head, and the limiting hole is located on the support column, and the limiting hole is a round hole.

[0017] Furthermore, the handle is also provided with a prompting unit electrically connected to the circuit board, which is used to drive the prompting unit to work when the trigger switch is triggered.

[0018] Furthermore, the prompting unit is an indicator light, which is mounted on a circuit board, and the handle is provided with a light guide for directing light at the position corresponding to the indicator light.

[0019] Furthermore, the light guide includes a sleeve and light guide protrusions respectively disposed on opposite sides of the sleeve. The sleeve is sleeved on the end of the mounting bracket near the brush head, and the handle is provided with a fourth avoidance hole for avoiding the light guide protrusions.

[0020] Furthermore, the electric toothbrush also includes an outer silicone sleeve, which is fitted onto the shaft support and is located between the sleeve and the shaft support.

[0021] The electric toothbrush also includes an inner silicone sleeve, which is disposed between the shaft support and the drive shaft. The inner silicone sleeve abuts against the core assembly at the end away from the brush head. The shaft support has a second clearance cavity for avoiding the inner silicone sleeve.

[0022] This invention offers the following advantages: Compared to existing technologies, this invention features a trigger bracket at the end of the motor assembly furthest from the brush head. When the brush head is subjected to pressure, the drive shaft at this end deflects under the pressure. By using the shaft bracket as a fulcrum and leveraging the lever principle, the motor assembly furthest from the brush head moves the trigger bracket closer to the trigger switch. With this structure, when the pressure on the brush head exceeds a certain value, the trigger bracket can trigger the switch, thus detecting the pressure on the brush head. This simple structure effectively reduces the cost of electric toothbrushes, thereby lowering the price and consumer cost. Furthermore, the pressure detection does not increase the motor load, solving the problems of increased noise, reduced battery life, and decreased gear lifespan caused by increased load in existing rotary electric toothbrush pressure detection structures, thus extending the lifespan of the electric toothbrush. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a perspective view of the present utility model;

[0025] Figure 2 This is an exploded view of the handle and brush head of this utility model;

[0026] Figure 3This is an exploded view of the present invention after the brush head has been removed;

[0027] Figure 4 This is a schematic diagram of the present invention after removing the brush head and handle;

[0028] Figure 5 This is an assembly drawing of the mechanism components, trigger bracket, adapter plate, shaft bracket, inner silicone sleeve, outer silicone sleeve, and drive shaft of this utility model.

[0029] Figure 6 This is an exploded view of the mechanism assembly, trigger bracket, adapter plate, shaft bracket, inner silicone sleeve, outer silicone sleeve, and drive shaft of this utility model.

[0030] Figure 7 This is a cross-sectional view of the mechanism assembly, trigger bracket, adapter plate, shaft bracket, inner silicone sleeve, outer silicone sleeve, drive shaft, mounting bracket, and battery of this utility model after they are assembled into one piece and cut along the central axis of the drive shaft. Detailed Implementation

[0031] 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.

[0032] See attached document Figures 1 to 7 An electric toothbrush according to an embodiment of this utility model.

[0033] The electric toothbrush includes a brush head 1 and a handle 2. The handle 2 houses a circuit board 7, a trigger bracket 90, a drive shaft 3, a shaft bracket 4, a mounting bracket 5, and a motor assembly 9 and a trigger switch 71 electrically connected to the circuit board 7. The motor assembly 9, driven by the circuit board 7, drives the drive shaft 3 to oscillate back and forth. The circuit board 7 and the shaft bracket 4 are both mounted on the mounting bracket 5. The trigger bracket 90 and the shaft bracket 4 respectively fix opposite ends of the motor assembly 9. One end of the drive shaft 3 passes through the shaft bracket 4 and extends to the outside of the handle 2, connecting to the brush head 1. The other end of the drive shaft 3 is connected to the motor assembly 9. The trigger switch 71 is located on the circuit board 7. The drive shaft 3 transmits pressure from the brush head 1 to the shaft bracket 4. When the shaft bracket 4 is under pressure, it drives the trigger bracket 90 via the motor assembly 9 to trigger the trigger switch 71.

[0034] This invention utilizes a mechanism assembly 9 to drive a transmission shaft 3 to oscillate when driven by a circuit board 7. The transmission shaft 3 then moves the brush head 1, achieving the function of cleaning the oral cavity. Furthermore, a trigger bracket 90 is positioned at the end of the mechanism assembly 9 furthest from the brush head 1. When the brush head 1 is subjected to pressure, the transmission shaft 3 deflects at this end, using a shaft support 4 as a fulcrum and lever principle. This causes the mechanism assembly 9 furthest from the brush head 1 to move the trigger bracket 90 towards the trigger switch 71. According to this structure, when the pressure on the brush head 1 exceeds a certain value, the trigger bracket 90 can trigger the switch 71 to detect the pressure on the brush head 1. This simple structure effectively reduces the cost of electric toothbrushes, thus lowering the price and consumer cost. Moreover, the pressure detection in this structure does not increase the motor load, solving the problems of increased noise, reduced battery life, and gear lifespan issues caused by increased load in existing rotary electric toothbrush pressure detection structures, thereby extending the lifespan of the electric toothbrush.

[0035] In one embodiment, the trigger bracket 90 includes a trigger post 914 disposed at the end of the core assembly 9 away from the brush head 1. The trigger post 914 is positioned corresponding to the trigger switch 71 so that when the drive shaft 3 is subjected to pressure from the brush head 1, the trigger post 914 is driven by the shaft bracket 4 and the core assembly 9 to trigger the trigger switch 71.

[0036] In one embodiment, the distance between the trigger post 914 and the trigger switch 71 is 0.2-0.5 mm, so that when the brush head 1 is subjected to a certain pressure, the trigger post 914 can press the trigger switch 71.

[0037] In one embodiment, the trigger bracket 90 further includes a fixing plate 911, a connecting plate 915, and a trigger post 914 disposed on the fixing plate 911. The fixing plate 911 is disposed at the end of the motor assembly 9 away from the brush head 1, the connecting plate 915 is disposed on the fixing plate 911, and the trigger post 914 is disposed on the connecting plate 915. The electric toothbrush also includes an adapter plate 94 and a conductive wire 93. The adapter plate 94 is located at the end of the fixing plate 911 away from the brush head 1. The motor assembly 9 has a power connection post 92 at the end away from the brush head 1. The fixing plate 911 has a first clearance hole 912 for avoiding the power connection post 92. The power connection post 92 passes through the first clearance hole 912 and is welded to the adapter plate 94, thereby fixing both the fixing plate 911 and the adapter plate 94 to the motor assembly 9. The adapter plate 94 has a third clearance hole 942 for avoiding the connecting plate 915. The trigger post 914 is located at the end of the adapter plate 94 away from the brush head 1. The connecting plate 915 is extended to the end of the adapter plate 94 away from the brush head 1 through the third clearance hole 942 so that the trigger post 914 is exposed.

[0038] The fixing plate 911 has a first clearance cavity 913 at the end away from the brush head 1. The adapter plate 94 has a second clearance hole 941 communicating with the first clearance cavity 913. One end of the conductive wire 93 is soldered to the adapter plate 94, part of the conductive wire 93 is placed in the first clearance cavity 913, and the other end of the conductive wire 93 passes through the second clearance hole 941 and is electrically connected to the circuit board 7. This structure can hide the conductive wire 93 and prevent the conductive wire 93 from accumulating messily on the outside of the fixing plate 911, so as not to affect the trigger post 914 triggering the trigger switch 71.

[0039] In one embodiment, limiting holes 51 are provided on both sides of the mounting bracket 5, and limiting portions 41 are provided on both sides of the shaft bracket 4. The limiting portions 41 are placed in the limiting holes 51, so that the limiting portions 41 act as fulcrums. With the lever principle, when one end of the drive shaft 3 is subjected to pressure from the brush head 1, the trigger pin 914 can be driven to trigger the trigger switch 71 via the shaft bracket 4 and the mechanism assembly 9. Specifically, the limiting portion 41 is a cylinder, the limiting hole 51 is a round hole, and the trigger switch 71 is a push-button switch, so that when one end of the drive shaft 3 is subjected to pressure from the brush head 1, the shaft bracket 4 can be driven to rotate around the limiting portion 41 as the fulcrum, and then the trigger pin 914 can be driven to rotate via the mechanism assembly 9 to press the trigger switch 71.

[0040] In one embodiment, the mounting bracket 5 has two spaced support columns 52 protruding at one end near the brush head 1, and the limiting hole 51 is located on the support column 52 to form a support column 52 with a certain elasticity so that the limiting part 41 can be assembled into the limiting hole 51.

[0041] In one embodiment, the handle 2 is also provided with a prompting unit 72 electrically connected to the circuit board 7. The circuit board 7 is used to drive the prompting unit 72 to work when the trigger switch 71 is triggered, so that when the user brushes his teeth too hard, the prompting unit 72 can remind the user to brush his teeth correctly.

[0042] Specifically, the prompting unit 72 is an indicator light, which is mounted on the circuit board 7. The handle 2 has a light guide 8 at the position corresponding to the indicator light to guide the light. That is, when the trigger switch 71 is triggered, the circuit board 7 drives the indicator light to light up, and the light guide 8 can guide the light out to remind the user.

[0043] In one embodiment, the light guide 8 includes a sleeve 81 and light guide protrusions 82 respectively disposed on opposite sides of the sleeve 81. The sleeve 81 is sleeved on the end of the mounting bracket 5 near the brush head 1, that is, the sleeve 81 is sleeved on the outside of the support post 52, that is, the sleeve 81 is located between the mounting bracket 5 and the handle 2 to fix the light guide 8. The handle 2 has a fourth clearance hole 21 for avoiding the light guide protrusions 82, so that the light guide protrusions 82 are displayed on the outside of the handle 2, so that when the indicator light is on, light can be guided out from the light guide protrusions 82 through the sleeve 81. Moreover, there are two light guide protrusions 82, which are easy for the user to observe and effectively remind the user.

[0044] Of course, in other embodiments, the prompting unit 72 may also be a voice prompt, a vibration prompt, a buzzer prompt, etc.

[0045] In one embodiment, the electric toothbrush further includes an outer silicone sleeve 42, which is fitted onto the shaft support 4 and located between the sleeve member 81 and the shaft support 4. The electric toothbrush also includes an inner silicone sleeve 44, which is disposed between the shaft support 4 and the drive shaft 3. The end of the inner silicone sleeve 44 away from the brush head 1 abuts against the motor assembly 9. The shaft support 4 has a second clearance cavity 43 for accommodating the inner silicone sleeve 44. By configuring the outer silicone sleeve 42 and the inner silicone sleeve 44, the noise between the shaft support 4, the drive shaft 3, and the motor assembly 9 can be effectively reduced when the motor assembly 9 drives the drive shaft 3 to swing.

[0046] In the above embodiment, the electric toothbrush also includes a battery 6 electrically connected to the circuit board 7. A charging terminal (not shown) electrically connected to the circuit board 7 is provided on the handle 2. The battery 6 is located at the end of the motor assembly 9 away from the brush head 1. The mounting bracket 5 has a first mounting cavity 53 and a second mounting cavity 54. The motor assembly 9 is placed in the first mounting cavity 53, and the battery 6 is placed in the second mounting cavity 54. The first mounting cavity 53 communicates with the second clearance cavity 43. The battery 6 supplies power to the circuit board 7, enabling the circuit board 7 to operate. Furthermore, by configuring the charging terminal, the circuit board 7 can charge the battery 6.

[0047] The movement assembly 9 can be composed of a motor and gears, with the drive shaft 3 connected to the eccentric position of the gears. When driven by the motor, the drive shaft 3 can be rotated via the gears.

[0048] 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.

[0049] Furthermore, the use of terms such as "first" and "second" in this utility model is 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 term "and / or" throughout the text includes three solutions; taking A and / or B as an example, it includes technical solution A, technical solution B, and a technical solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of a person 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.

[0050] The above description is only a preferred 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 inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric toothbrush, characterized in that, It includes a brush head and a handle. The handle contains a circuit board, a trigger bracket, a drive shaft, a shaft bracket, a mounting bracket, a mechanism assembly electrically connected to the circuit board, and a trigger switch. The mechanism assembly is used to drive the drive shaft to swing back and forth when driven by the circuit board. The circuit board and shaft bracket are both mounted on the mounting bracket. The trigger bracket and shaft bracket respectively fix the opposite ends of the mechanism assembly. One end of the drive shaft passes through the shaft bracket and extends to the outside of the handle and connects to the brush head. The other end of the drive shaft is connected to the mechanism assembly. The trigger switch is set on the circuit board. The drive shaft is used to transmit the pressure on the brush head to the shaft support. When the shaft support is under pressure, it drives the trigger bracket to move through the core assembly to trigger the trigger switch.

2. The electric toothbrush according to claim 1, characterized in that, The trigger bracket includes a trigger post disposed at the end of the core assembly away from the brush head, and the trigger post is positioned corresponding to the trigger switch.

3. The electric toothbrush according to claim 2, characterized in that, The distance between the trigger post and the trigger switch is 0.2-0.5 mm.

4. The electric toothbrush according to claim 2, characterized in that, The trigger bracket also includes a fixing plate, a connecting plate, and a trigger post disposed on the fixing plate. The fixing plate is disposed at the end of the mechanism assembly away from the brush head, the connecting plate is disposed on the fixing plate, and the trigger post is disposed on the connecting plate. The electric toothbrush also includes an adapter plate and conductive wires. The adapter plate is located at the end of the fixed plate away from the brush head. The motor assembly is provided with a power terminal at the end away from the brush head. The fixed plate is provided with a first clearance hole for avoiding the power terminal. The power terminal passes through the first clearance hole and is welded to the adapter plate. The fixing plate has a first clearance cavity at the end away from the brush head, and the adapter plate has a second clearance hole communicating with the first clearance cavity. One end of the conductive wire is soldered to the adapter plate, and part of the conductive wire is placed in the first clearance cavity. The other end of the conductive wire passes through the second clearance hole and is electrically connected to the circuit board. The adapter plate has a third clearance hole for avoiding the connecting plate, and the trigger post is located at the end of the adapter plate away from the brush head.

5. The electric toothbrush according to claim 1, characterized in that, The mounting bracket has limit holes on both sides, and the shaft bracket has limit parts on both sides, with the limit parts placed inside the limit holes.

6. The electric toothbrush according to claim 5, characterized in that, The mounting bracket has two spaced support columns protruding at one end near the brush head, and the limiting hole is located on the support column. The limiting hole is a round hole.

7. The electric toothbrush according to claim 1, characterized in that, The handle is also equipped with a prompting unit that is electrically connected to the circuit board. The circuit board is used to drive the prompting unit to work when the trigger switch is triggered.

8. The electric toothbrush according to claim 7, characterized in that, The prompting unit is an indicator light, which is mounted on a circuit board. The handle has a light guide for directing light at the position corresponding to the indicator light.

9. The electric toothbrush according to claim 8, characterized in that, The light guide includes a sleeve and light guide protrusions respectively disposed on opposite sides of the sleeve. The sleeve is sleeved on the end of the mounting bracket near the brush head. The handle is provided with a fourth avoidance hole for avoiding the light guide protrusions.

10. The electric toothbrush according to claim 9, characterized in that, The electric toothbrush also includes an outer silicone sleeve, which is fitted onto the shaft support and is located between the sleeve and the shaft support. The electric toothbrush also includes an inner silicone sleeve, which is disposed between the shaft support and the drive shaft. The inner silicone sleeve abuts against the core assembly at the end away from the brush head. The shaft support has a second clearance cavity for avoiding the inner silicone sleeve.

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