An electric toothbrush

Abstract

The present invention is an electric toothbrush comprising a housing, an inner bracket, and a transmission rod with a vibration motor. The housing has a first mounting cavity and a second mounting cavity separated from each other, the first mounting cavity having a first opening, the second mounting cavity having a second opening, the first opening and the second opening facing different directions of the housing. The vibration motor is disposed at the upper end of the transmission rod, the lower end of the transmission rod being mounted within the first mounting cavity via the opening, and the inner bracket being mounted within the second mounting cavity via the opening, such that the inner bracket and transmission rod are disconnected within the housing. The present invention provides an electric toothbrush with a simplified structure, which facilitates production and assembly and forms a waterproof structure.

Description

Technical Field

[0001] The present invention relates to the field of oral care, in particular to an electric toothbrush. Background Art

[0002] The prior art discloses an electric toothbrush patent with patent number 201010188777.7, which specifically discloses the following structure, including a vibration motor, a transmission rod, an inner bracket and a shell. The vibration motor, the transmission rod and the inner bracket are installed in the shell, and the vibration motor is set in the transmission rod. Some electrical components, such as circuit boards, batteries, etc., are fixed on the inner bracket, and the circuit board on the inner bracket is connected to the vibration motor through wires to power the vibration motor to make it vibrate. After assembly is completed, the transmission rod is directly fixed to the inner bracket to reduce the vibration of the shell. This type of shell only has one installation cavity and is open on both sides. The transmission rod needs to pass through the shell to connect with the inner bracket, which means that water may flow into the inner bracket from the gap between the transmission rod and the shell. The water inflow will cause the capacitors, diodes, transistors and chips on the circuit board to be broken down, forming a short circuit and burning, and will also corrode these electrical components. Therefore, a sealing structure needs to be provided between the transmission rod and the shell, which invisibly increases the product complexity of the electric toothbrush.

[0003] Moreover, during the assembly process of the inner bracket and the transmission rod, the wires between the inner bracket and the transmission rod are first welded, and then the whole is installed into the shell. Therefore, the inner bracket and the transmission rod are only connected by wires at this time. When the robot grabs the inner bracket, the transmission rod will shake nearby, affecting the movement of the robot, which is not conducive to the automated production of the product. Summary of the Invention

[0004] The purpose of the present invention is to solve the above technical problems and provide an electric toothbrush. The present invention provides an electric toothbrush with a simplified structure, which is convenient for production and assembly and forms a waterproof structure.

[0005] In order to achieve the above object, the technical solutions of the present invention are:

[0006] An electric toothbrush comprises an outer shell, an inner bracket and a transmission rod with a vibration motor; the outer shell has a first mounting cavity and a second mounting cavity separated from each other, the first mounting cavity is provided with a first opening, the second mounting cavity is provided with a second opening, the first opening and the second opening are respectively arranged towards different directions of the outer shell, the vibration motor is arranged at the upper end of the transmission rod, the lower end of the transmission rod is mounted in the first mounting cavity through the opening, and the inner bracket is mounted in the second mounting cavity through the opening, so that the inner bracket and the transmission rod are not connected in the outer shell.

[0007] The electric toothbrush of the present application is roughly divided into three parts: an outer shell, an inner bracket and a transmission rod with a vibration motor. The outer shell has a first installation cavity and a second installation cavity separated from each other, and a first opening and a second opening facing different directions are provided for the installation of the inner bracket and the transmission rod. Since the first installation cavity and the second installation cavity are separated from each other, the first installation cavity and the second installation cavity can be waterproof. At the same time, the inner bracket and the transmission rod are not connected in the outer shell, and water cannot flow from the gap between the first installation cavity and the transmission rod into the inner bracket in the second installation cavity. The simplified structure is also more convenient for the automated production of electric toothbrushes. Since two installation cavities are respectively opened on the outer shell, the robot only needs to grasp the outer shell, and then assemble the transmission rod and the inner bracket into the shell from the two openings respectively, without causing the normal situation of interfering with the robot in the background technology.

[0008] Furthermore, a shock-absorbing pad is included, which covers the lower end of the transmission rod. The shock-absorbing pad can reduce the vibration transmitted from the transmission rod to the housing. When the electric toothbrush housing is grasped by the hand, the transmission rod will vibrate efficiently using the first mounting cavity in the housing as a fulcrum, and the shock-absorbing pad can also provide elastic space for its vibration.

[0009] Furthermore, the electric toothbrush further includes a retaining ring that is sleeved onto the outer wall of the first mounting cavity. A retaining hole is provided in the middle of the retaining ring, through which the upper end of the transmission rod passes and which restrains the lower end of the transmission rod outside the first mounting cavity. The retaining ring restrains the transmission rod within the first mounting cavity, preventing the transmission rod from being displaced or even falling off the electric toothbrush during vibration.

[0010] Furthermore, an annular snap-fit groove is provided on the outer wall of the first mounting cavity, and a snap-fit protrusion extends from the fixing ring toward the snap-fit groove, thereby snapping and securing the fixing ring to the outer wall of the first mounting cavity. This provides a more specific fixing structure for the fixing ring. The snap-fit groove is annular, so the snap-fit protrusion of the fixing ring can be installed without selecting an installation angle, further simplifying the assembly process.

[0011] Furthermore, the shock-absorbing pad and the transmission rod are integrally formed.

[0012] Furthermore, it also includes a battery, which is arranged in the second installation cavity, and the second installation cavity is provided with a charging socket at the second opening for charging the battery.

[0013] Furthermore, the housing further includes a spring pin, and a partition is provided between the first and second mounting cavities, with the spring pin being mounted on the partition. The partition structure with the spring pin allows the housing to separate the first and second mounting cavities while maintaining electrical connection between the two cavities. Furthermore, as long as the spring pin is waterproof, the entire partition is also waterproof.

[0014] Furthermore, the vibration motor is welded to the elastic needle through a conductive circuit, or the transmission rod is provided with a first electrode sheet connected to the vibration motor relative to the elastic needle, and the first electrode sheet elastically contacts the elastic needle.

[0015] Furthermore, the inner bracket is provided with a second electrode sheet at a position corresponding to the elastic pin, and the second electrode sheet elastically contacts the elastic pin.

[0016] Furthermore, it further includes a circuit board, which is fixed on the inner bracket, and the circuit board supplies power to the vibration motor through the elastic pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exploded view of the electric toothbrush of the present invention;

[0018] Figure 2 An exploded view of the main body of the present invention;

[0019] Figure 3 A cross-sectional view of the main body of the present invention;

[0020] Figure 4 for Figure 3 A partial enlarged view of . DETAILED DESCRIPTION

[0021] Combined with attachment Figures 1 to 4 An electric toothbrush according to the present invention is described.

[0022] like Figure 1 The electric toothbrush shown comprises a main body and a toothbrush head 2. The toothbrush head 2 is detachably mounted on the main body, and the main body provides vibration for the toothbrush head 2 so that the toothbrush head 2 can perform a teeth brushing operation.

[0023] like Figures 2 to 4 As shown, the main body includes an outer shell 1, an inner bracket 4, a fixing ring 6, a shock-absorbing pad 5, a vibration motor 7 and a transmission rod 3; the vibration motor 7 is arranged at the upper end of the transmission rod 3, and the vibration motor 7 is fixed in the upper end of the transmission rod 3 by a filler 71, and the power supply line of the vibration motor 7 will pass through the filler 71 to connect to an external power supply to power the vibration motor 7.

[0024] The housing 1 has a first mounting cavity 11 and a second mounting cavity 12 separated from each other. The first mounting cavity 11 is provided with a first opening, and the second mounting cavity 12 is provided with a second opening. The first opening and the second opening are respectively arranged in different directions of the housing 1. The lower end 31 of the transmission rod 3 is installed in the first mounting cavity 11 through the opening, and the inner bracket 4 is installed in the second mounting cavity 12 through the opening. Specifically, a partition 13 is provided between the first mounting cavity 11 and the second mounting cavity 12. The partition 13 can preferably be integrally injection molded with the housing 1. Since the first mounting cavity 11 and the second mounting cavity 12 are separated from each other, it is easier to provide a waterproof structure for the first mounting cavity 11 and the second mounting cavity 12, so that water cannot flow into the inner bracket 4 in the second mounting cavity 12 from the gap between the first mounting cavity 11 and the transmission rod 3. The simplified structure also facilitates the automated production of electric toothbrushes. Since the housing 1 has two mounting cavities, the robot only needs to grasp the housing 1 and then assemble the transmission rod 3 and the inner bracket 4 into the housing through the two openings, without causing interference with the normal situation of the robot in the background art.

[0025] The upper end of the transmission rod 3 is for the brush head 2 to be inserted and fixed, and the lower end 31 is fixed in the first mounting cavity 11, providing a fulcrum for the vibration of the transmission rod 3. In order to reduce the vibration transmitted from the transmission rod 3 to the housing 1, the shock-absorbing pad 5 is covered on the outside of the lower end 31 of the transmission rod. In this way, the shock-absorbing pad 5 can reduce the vibration transmitted from the transmission rod 3 to the housing 1. When the housing 1 of the electric toothbrush is held by hand, the transmission rod 3 will vibrate efficiently in the first mounting cavity 11 in the housing 1 as a fulcrum. At the same time, the shock-absorbing pad 5 can also provide an elastic space for its vibration. The shock-absorbing pad 5 can also be integrally formed with the transmission rod 3, and the assembly steps of the electric toothbrush shock-absorbing pad 5 and the transmission rod 3 can be reduced through advanced technology; through the secondary injection molding process, the soft shock-absorbing pad 5 can be integrally formed with the hard transmission rod 3, wherein the shock-absorbing pad 5 is usually made of silicone material, and the transmission rod 3 is usually made of hard plastic material. In addition, the shock-absorbing pad 5 can be formed separately from the transmission rod 3 and then assembled into the first installation cavity 11 through an assembly process, which can also achieve the installation and shock absorption of the transmission rod 3.

[0026] In addition, in order to prevent the lower end 31 of the transmission rod 3 from rotating in the first installation cavity 11 after being installed in the first installation cavity 11, a limiting notch 311 is provided at the lower end 31 of the transmission rod 3, and the shock-absorbing pad 5 is also formed to fit the notch 311, and a limiting block 111 cooperating therewith is formed in the first installation cavity 11 to limit the circumferential rotational displacement of the transmission rod 3.

[0027] In order to firmly fix the transmission rod 3 in the first mounting cavity 11, a structure is provided for fixing and limiting the transmission rod 3 by a fixing ring 6. The fixing ring 6 is sleeved on the outer wall of the first mounting cavity 11. A limiting hole 61 is provided in the middle of the fixing ring 6 for the upper end of the transmission rod to pass through and limit the lower end 31 of the transmission rod outside the first mounting cavity 11. The fixing ring 6 limits the transmission rod 3 in the first mounting cavity 11 to prevent the transmission rod 3 from being displaced or even falling off the electric toothbrush during vibration. An annular buckling groove 112 is provided on the outer wall of the first mounting cavity 11. The fixing ring 6 has a buckling protrusion extending toward the buckling groove 112 so that the fixing ring 6 is buckled and fixed to the outer wall of the first mounting cavity 11. A more specific fixing structure of the fixing ring 6 is provided, and the buckling groove 112 is set in an annular shape, so that the buckling protrusion of the fixing ring 6 can be installed without selecting an installation angle, which simplifies the assembly process. In addition, a sealing ring structure 113 is provided at the lower end 31 of the buckling protrusion and the buckling groove 112 to prevent water from entering the buckling protrusion and the buckling groove 112 to lubricate the buckling protrusion and affect the fixing effect of the fixing ring 6.

[0028] The second mounting cavity 12 further includes a battery 8 and a circuit board 41. The battery 8 is disposed in the second mounting cavity 12. The second mounting cavity 12 is provided with a charging socket 81 at the second opening for charging the battery 8. The circuit board 41 is fixed to the inner bracket 4. The battery 8 supplies power to the circuit board 41 and the vibration motor 7. Figure 2 The circuit board 41 is fixed to the inner bracket 4 by the hook on the inner bracket 4, and a limiting claw 42 is also provided at the lower part of the inner bracket 4. Figure 3 The inner bracket 4 is fixed in the second mounting cavity 12 through the limiting claw 42 .

[0029] This application also provides two embodiments for powering the transmission rod 3:

[0030] Example 1

[0031] The housing 1 also includes a spring pin 131, which is mounted on the partition 13. The partition 13 structure with the spring pin 131 allows the housing 1 to separate the first and second mounting cavities 11 and 12 while maintaining electrical connection between the two cavities. As long as the spring pin 131 is waterproof, the entire partition 13 is also waterproof. The vibration motor 7 is soldered to the spring pin 131 via a conductive circuit. The inner bracket 4 is provided with a second electrode plate 411 at a position corresponding to the spring pin 131, which elastically contacts the spring pin 131. A battery 8 supplies power to the circuit board 41. The second electrode plate 411 is connected to the top of the circuit board 41. Power is supplied to the vibration motor 7 via the second electrode plate 411 and the spring pin 131, with a supply voltage of 3V to 4.2V. To achieve a conductive circuit, two spring pins are provided. Even if water leaks into the first cavity, water is essentially non-conductive at such a low current voltage, and even if water connects to the two spring pins, it will not affect the power supply to the vibration motor. And on this basis, the installation position of the two spring pins can also be improved. Generally, when using an electric toothbrush, the bristles are aligned with the teeth, and the two spring pins are arranged up and down in the vertical direction of the bristles. Even if water leaks into the first installation cavity, it will accumulate on one side of the spring pin due to gravity and will not connect the two spring pins.

[0032] Example 2

[0033] Based on Example 1, the transmission rod 3 is provided with a first electrode sheet connected to the vibration motor 7, opposite the spring pin 131. This first electrode sheet elastically contacts the spring pin 131. The inner bracket 4 is provided with a second electrode sheet 411 at a position corresponding to the spring pin 131. This second electrode sheet 411 elastically contacts the spring pin 131. The circuit board 41 supplies power to the vibration motor 7 via the spring pin 131. This structure is more complex than that of Example 1, requiring a housing on the transmission rod 3 for mounting the first electrode sheet to contact the spring pin 131. However, when assembling the transmission rod 3, soldering of wires is unnecessary, allowing the transmission rod 3 to be conveniently assembled into the first mounting cavity 11.

[0034] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An electric toothbrush, characterized in that: The invention comprises an outer shell, an inner bracket and a transmission rod with a vibration motor; the outer shell has a first installation cavity and a second installation cavity separated from each other, the first installation cavity is provided with a first opening, the second installation cavity is provided with a second opening, the first opening and the second opening are respectively arranged towards different directions of the outer shell, the vibration motor is fixed to the upper end of the transmission rod, the lower end of the transmission rod is installed in the first installation cavity through the first opening, and the inner bracket is installed in the second installation cavity through the second opening, so that the inner bracket and the transmission rod are not connected in the outer shell; it also comprises two spring pins, a partition integrally formed with the outer shell is provided between the first installation cavity and the second installation cavity, and the two spring pins are provided on the partition; when the electric toothbrush is automatically produced, the transmission rod and the inner bracket are respectively assembled into the shell from the two openings; the vibration motor is connected to the outer shell through a conductive circuit A first electrode sheet welded on the elastic pin, or the transmission rod is provided with a first electrode sheet connected to the vibration motor relative to the elastic pin, and the first electrode sheet elastically contacts the elastic pin; the inner bracket is provided with a second electrode sheet at a position corresponding to the elastic pin, and the second electrode sheet elastically contacts the elastic pin, and also includes a circuit board, the circuit board is fixed on the inner bracket, and the circuit board supplies power to the vibration motor through the elastic pin; it also includes a fixing ring, the fixing ring is sleeved on the outer wall of the first mounting cavity, and a limiting hole is provided in the middle of the fixing ring for the upper end of the transmission rod to pass through and limit the lower end of the transmission rod outside the first mounting cavity, an annular buckling groove is provided on the outer wall of the first mounting cavity, and a buckling protrusion extends from the fixing ring to the buckling groove so that the fixing ring is buckled and fixed to the outer wall of the first mounting cavity, and a sealing ring structure is provided at the lower end of the buckling protrusion and the buckling groove.

2. The electric toothbrush according to claim 1, wherein It also includes a shock-absorbing pad, which is covered on the lower end of the transmission rod.

3. The electric toothbrush according to claim 2, wherein: The shock-absorbing pad and the transmission rod are integrally formed.

4. The electric toothbrush according to claim 1, wherein It also includes a battery, which is arranged in the second installation cavity. The second installation cavity is provided with a charging socket at the second opening for charging the battery.

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