Spring device for a toothbrush head and electric toothbrush head device

Abstract

This invention discloses an electric toothbrush head device with a built-in spring device. The spring device is disposed within a receiving cavity and abuts against a drive shaft. The spring device includes an arched protrusion that arches towards the drive shaft. The side of the drive shaft facing the spring device has a toothed groove that matches the arched protrusion. The drive shaft presses against the arched protrusion, causing elastic deformation that stably fixes the drive shaft within the receiving cavity. This invention enhances the locking effect by incorporating a spring device internally, offering advantages such as high practicality, high stability, and resistance to deformation over long-term use.

Description

Technical Field

[0001] This invention relates to the field of electric toothbrush technology, specifically to an electric toothbrush head device with a built-in spring mechanism. Background Technology

[0002] Electric toothbrushes typically come with removable and replaceable attachment brushes, also known as "replacement heads," allowing the common handle to be used by multiple family members, each with their own individual replacement head. Furthermore, when the brush head wears out and / or, in other words, needs to be replaced, only the replacement head needs to be replaced—not the entire electric toothbrush including the handle.

[0003] Most toothbrush heads on the market are made of plastic, which is not environmentally friendly enough. While there are also more environmentally friendly bamboo toothbrush heads, bamboo products lack toughness and flexibility. They use external rod-shaped or tubular plastic clamping structures, which are prone to loosening over time, causing the toothbrush head to separate from the drive shaft, thus affecting the product's performance and its widespread adoption.

[0004] Therefore, people desire an electric toothbrush that is highly stable, does not easily loosen or deform with long-term use, and has a locking drive shaft device. Summary of the Invention

[0005] The main objective of this invention is to provide an electric toothbrush head device with a built-in spring device that is highly practical, has an internal spring device to increase the locking effect, is highly stable, is not easily deformed after long-term use, and is more convenient to use.

[0006] To achieve the above objectives, the present invention provides an electric toothbrush head device with a built-in spring device, comprising a toothbrush head, a brush blade assembly, and an electric motor. The bottom of the toothbrush head includes a drive shaft mounting hole, and a receiving cavity is provided along the drive shaft mounting hole towards the brush blade assembly. The electric motor includes a drive shaft that passes through the drive shaft mounting hole and is disposed within the receiving cavity; characterized in that:

[0007] A spring-loaded device is provided inside the receiving cavity, and the spring-loaded device abuts against the drive shaft.

[0008] The spring device includes an arched protrusion that arches toward the drive shaft;

[0009] The drive shaft facing the spring device has a toothed groove that matches the arched protrusion; the drive shaft presses against the arched protrusion to form an elastic deformation, thereby stably fixing the drive shaft in the receiving cavity.

[0010] Preferably, the arched protrusion includes:

[0011] An arched groove is provided facing away from the drive shaft; and

[0012] An anti-slip rib is disposed toward the drive shaft, and the anti-slip rib matches the tooth groove.

[0013] Preferably, the spring device includes a limiting groove, the limiting groove including a left limiting wall and a right limiting wall protruding toward the drive shaft; the arched protrusion is disposed between the left limiting wall and the right limiting wall to prevent the drive shaft from displacing relative to the arched protrusion.

[0014] Preferably, a hollow portion is provided between the arched protrusion and the left limiting wall and / or between the arched protrusion and the right limiting wall to enhance the elastic deformation capability of the arched protrusion.

[0015] Preferably, the spring device includes a guide groove disposed in the receiving groove and corresponding to the drive shaft;

[0016] The top of the guide groove is connected to the limiting groove, and the bottom extends toward the drive shaft mounting hole.

[0017] Preferably, the guide groove includes:

[0018] A left guide wall and a right guide wall protruding in the direction of the drive shaft, and a first surface disposed between the left guide wall and the right guide wall;

[0019] The first surface faces the drive shaft and is provided with a stepped groove, which corresponds to the shaft center seat provided on the drive shaft.

[0020] Preferably, the guide groove includes a second surface facing the inner wall of the receiving cavity, and the second surface is provided with a guide groove to increase the elastic deformation capability of the guide groove.

[0021] Preferably, at least one protruding cone is provided at any of the left guide wall, the right guide wall, and the second surface, so that the guide groove can be stably held in the receiving cavity.

[0022] Preferably, the protrusions are dot-shaped, strip-shaped, or band-shaped.

[0023] Preferably, the protruding cone is disposed along the left guide wall and / or the right guide wall, and is parallel to the guide groove.

[0024] Preferably, the side of the drive shaft facing away from the tooth groove is provided with a protrusion; the protrusion is axially disposed on the shaft seat.

[0025] Preferably, the width of the guide groove is larger than the width of the limiting groove.

[0026] Preferably, the toothbrush head is a bamboo toothbrush head; the spring device is a plastic spring device.

[0027] Preferably, the toothbrush head has a mounting groove at the top, and the brush blade assembly is disposed in the mounting groove.

[0028] Preferably, the brush assembly includes a connecting portion disposed within the mounting groove, and a plurality of brush bristles disposed on the connecting portion for cleaning teeth; the connecting portion extends outward and covers the mounting groove.

[0029] The present invention also provides a spring device for a toothbrush head, the spring device being installed in the receiving cavity of the toothbrush head and abutting against the drive shaft for driving the toothbrush head to move.

[0030] The spring device includes a limiting groove and a guide groove arranged vertically, as well as an arched protrusion arranged on the limiting groove; the limiting groove and the guide groove are arranged in the receiving cavity and correspond to the drive shaft;

[0031] The limiting groove includes a left limiting wall and a right limiting wall that protrude toward the drive shaft; the arched protrusion is disposed between the left limiting wall and the right limiting wall and arches toward the drive shaft so that the drive shaft presses the arched protrusion to form an elastic deformation so that the drive shaft is stably fixed in the receiving cavity.

[0032] Preferably, the arched protrusion includes:

[0033] An arched groove is provided facing away from the drive shaft; and

[0034] An anti-slip rib is disposed toward the drive shaft, and the anti-slip rib matches the tooth groove.

[0035] The beneficial technical effects of this invention are:

[0036] 1) The present invention has a spring device inside the toothbrush head, which locks the drive shaft of the electric motor, making the drive shaft less prone to loosening; extending the service life, making it safer and more stable to use, and providing better teeth cleaning effect;

[0037] 2) The spring device of the present invention has a simple structure, good clamping effect, and is more convenient to manufacture and process;

[0038] 3) The spring device of the present invention can be applied to toothbrush heads made of plastic or bamboo. Due to its small size and ingenious design, the spring device avoids the additional impact of large areas of non-bamboo materials on the density of bamboo materials, which can cause it to loosen. This not only greatly reduces costs but also improves the product's service life and is beneficial to environmental protection. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of an electric toothbrush according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of a partial explosion structure of an electric toother according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of an electric toothbrush head according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of a built-in spring device according to an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of a built-in spring device according to an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of an electric toothbrush drive device according to another embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the structure of an electric toothbrush drive device according to another embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the structure of an electric toothbrush head according to another embodiment of the present invention;

[0048] Figure 9 This is a schematic cross-sectional view of an electric toothbrush with a built-in spring device according to another embodiment of the present invention;

[0049] Figure 10 This is a schematic diagram of another cross-sectional structure of an electric toothbrush with a built-in spring device according to another embodiment of the present invention;

[0050] Figure 11 This is a schematic diagram of the internal spring device according to another embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram of the internal spring device according to another embodiment of the present invention;

[0052] Figure 13 This is a schematic diagram of the internal spring device according to another embodiment of the present invention;

[0053] Figure 14This is a schematic diagram of the internal spring device according to another embodiment of the present invention;

[0054] Figure 15 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0055] Figure 16 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0056] Figure 17 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0057] Figure 18 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0058] Figure 19 This is another structural schematic diagram of a toothbrush head brush blade assembly according to an embodiment of the present invention;

[0059] Figure 20 This is another structural schematic diagram of a toothbrush head brush blade assembly according to an embodiment of the present invention;

[0060] Figure 21 This is another structural schematic diagram of a toothbrush head brush blade assembly according to an embodiment of the present invention;

[0061] Figure 22 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0062] Figure 23 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0063] Figure 24 This is a schematic diagram of the toothbrush head brush blade assembly structure according to another embodiment of the present invention;

[0064] Figure 25 This is a schematic diagram of the toothbrush head and brush blade assembly structure according to another embodiment of the present invention.

[0065] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0067] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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 indication will also change accordingly.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0070] This invention proposes an electric toothbrush head device with a built-in spring device.

[0071] Example 1

[0072] In one embodiment of the present invention, the spring device applied to the toothbrush head is used in conjunction with an electric toothbrush head 10. (See also...) Figure 1 , Figure 2 As shown, this embodiment provides an electric toothbrush, including a toothbrush head 10, a brush blade assembly 20, and an electric motor 30.

[0073] Combination Figure 2 As shown, the electric motor 30 includes a drive shaft 31. In this embodiment, preferably, the toothbrush head 10 is made of bamboo material, using natural bamboo mechanical processing to greatly reduce costs, making it lighter and more convenient to use, which is environmentally friendly and easy to use.

[0074] Combination Figure 3As shown, the toothbrush head 10 has a drive shaft mounting hole 121 at the bottom. Along the drive shaft mounting hole 121 toward the brush assembly 20, the toothbrush head 10 is provided with a receiving cavity 12. The drive shaft 31 passes through the drive shaft mounting hole 121 and is disposed in the receiving cavity 12.

[0075] Combination Figure 2 and Figure 3 As shown, a spring device 40 is provided within the receiving cavity 12, and the spring device 40 abuts against the drive shaft 31. In this embodiment, the mounting position of the spring device 40 and the spring device 40 form a tight fit, eliminating the need for glue fixation and improving upon the original glue fixation method. It is simpler and safer.

[0076] like Figure 4 As shown, the spring device 40 includes a limiting groove 41 and a guide groove 42 arranged vertically, and an arched protrusion 413 arranged on the limiting groove 41; the limiting groove 41 and the guide groove 42 are arranged in the receiving cavity 12 and correspond to the drive shaft 31.

[0077] The limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412 protruding towards the drive shaft. An arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412, and arches towards the drive shaft 31 so that the drive shaft 31 presses against the arched protrusion 413 to form an elastic deformation, thus stably fixing the drive shaft 31 within the receiving cavity 12. The protruding left limiting wall 411 and right limiting wall 412 can conform to the shape of the drive shaft 31 to provide left and right auxiliary fixation for the drive shaft 31.

[0078] refer to Figure 5 As shown, an arched groove 414 is provided on the back of the arched protrusion 413 of the limiting groove 41. In this embodiment, the arched groove 414 allows the arched protrusion 413 to have space for elastic deformation, thereby generating elastic force. This elastic force presses the axis against the inner wall of the toothbrush head 10 receiving cavity 12, thereby fixing the toothbrush head 10 on the electric motor 30.

[0079] refer to Figure 5 As shown, the top of the guide groove 42 is connected to the limiting groove 41, and the bottom extends towards the drive shaft mounting hole 121. The guide groove 42 includes a left guide wall 421 and a right guide wall 422, and a first surface disposed between the left guide wall 421 and the right guide wall 422. The first surface of the guide groove 42 is provided with a guide groove 425. The guide groove 425 allows the elastic device to be thinner and lighter, and has better elastic deformation capability.

[0080] Example 2

[0081] This embodiment provides an electric toothbrush equipped with a spring clip device.

[0082] The spring device 40 will be described in conjunction with Embodiment 1.

[0083] Reference Figure 1 As shown, this embodiment provides an electric toothbrush, including a brush head 10, a brush blade assembly 20, and an electric motor 30. Combined with... Figure 2 As shown, the electric motor 30 includes a drive shaft 31. The assembly gap between the drive shaft 31 and the toothbrush head 10 is controlled by the bottom depth of the receiving cavity 12.

[0084] In the receiving cavity 12 of the toothbrush head 10, there is a pivot seat 32 that restricts the movement of the drive shaft 31 of the electric motor 30.

[0085] Combination Figure 6 , Figure 7 In this embodiment, the electric motor 30 includes a shaft seat 32, which is frustum-shaped and gradually narrows from bottom to top in a stepped manner. The drive shaft 31 is mounted on the shaft seat 32.

[0086] Furthermore, such as Figure 6 As shown, to accommodate the specially configured drive shaft 31, for example, a protrusion 311 is provided on the side of the drive shaft 31 facing away from the toothed groove 312; the protrusion 311 is axially disposed on the shaft seat 32. Figure 8 As shown, a flat limiting surface 16 is provided on one side of the first section 14 of the spring device 40 mounting position. The flat limiting surface 16 is in contact with and matches the flat part on the drive shaft 31 of the electric motor 30, and together with the first section 14 of the spring device 40 mounting position, the electric motor 30 is installed.

[0087] Preferably, an arc-shaped groove 15 is provided in the receiving cavity 12. The arc-shaped groove 15 is an adapter position for the electric motor 30 and is used to install the mounting protrusion of the electric motor 30.

[0088] In this embodiment, the arc groove 15 of the flat limiting surface 16 and the protrusion 311 on the drive shaft 31 are assembled. The function of the arc groove 15 and the protrusion 311 is to prevent the drive shaft 31 from being installed in the wrong direction; to increase the friction between the drive shaft 31 and the toothbrush head 10, so that the toothbrush head 10 is not easy to fall off the drive shaft 31 when it is working.

[0089] Preferably, the other side of the drive shaft 31 is provided with transversely parallel toothed grooves 312. Further, preferably, the toothed grooves 312 can be composed of multiple transversely parallel toothed grooves 312.

[0090] Combination Figure 7 , Figure 11As shown, in this embodiment, the spring device 40 includes a guide groove 42 disposed in the receiving groove 12 and corresponding to the drive shaft 31; the top of the guide groove 42 is connected to the limiting groove 41, and the bottom extends toward the mounting hole of the drive shaft 31.

[0091] The limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412 protruding towards the drive shaft 31. An arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412, and arches towards the drive shaft 31 so that the drive shaft 31 presses against the arched protrusion 413 to form an elastic deformation, thereby stably fixing the drive shaft 31 within the receiving cavity 12. The protruding left limiting wall 411 and right limiting wall 412 can conform to the shape of the drive shaft 31 to provide left and right auxiliary fixation for the drive shaft 31.

[0092] Similarly, refer to Figure 5 The arched protrusion 413 has an arched groove 414 on the side facing away from the drive shaft 31.

[0093] Furthermore, combined with Figure 11 Multiple horizontally parallel anti-slip bones 4131 can be provided on the side of the arched protrusion 413 facing the drive shaft 31, and these anti-slip bones 4131 are arranged in an arc shape. Preferably, the anti-slip bones 4131 provided on the arched protrusion 413 in the limiting groove 41 can engage with the toothed groove 312 on the drive shaft 31, so that the toothbrush head 10 is not easily dislodged from the drive shaft 31 when it is working.

[0094] The position of the tooth groove 312 corresponds to the position of the arched protrusion 413 of the limiting groove 41. The arched protrusion 413 meshes with the tooth groove 312. The limiting groove 41 is engaged with the drive shaft 31 of the electric host 30 through the engagement of the arched protrusion 413 and the tooth groove 312, which has a better clamping effect and better prevents the drive shaft 31 from loosening.

[0095] Combination Figure 10 , Figure 11 As shown, in use, the toothbrush head 10 is installed on the electric motor 30, and the drive shaft 31 of the electric motor 30 is inserted into the guide groove 42. The arched groove 414 presses the drive shaft 31 of the electric motor 30 against the flat limiting surface 16 of the toothbrush head 10. The arched protrusion 413 also engages with the toothed grooves 312 on the drive shaft 31 one by one, thereby fixing the electric motor 30.

[0096] When the electric motor 30 is turned on, the power is output from the drive shaft 31 and transmitted to the toothbrush head 10 handle. The toothbrush head handle drives the bristles 22 of the brush blade 21 to swing, thereby achieving the purpose of cleaning teeth. Optionally, the diameter of the receiving cavity 12 is 8-12 mm and the depth is 7-9 mm. These parameters are only examples. Those skilled in the art will know that different toothbrush heads have different lengths, and the length of the drive shaft can be adjusted accordingly, all of which fall within the scope of this patent application.

[0097] Example 3

[0098] Combination Figure 7 , Figure 12 , Figure 13 As shown, in this embodiment, the spring device 40 includes a guide groove 42 disposed in the receiving groove 12 and corresponding to the drive shaft 31; the top of the guide groove 42 is connected to the limiting groove 41, and the bottom extends toward the mounting hole of the drive shaft 31.

[0099] The limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412 protruding towards the drive shaft 31. An arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412, and arches towards the drive shaft 31 so that the drive shaft 31 presses against the arched protrusion 413 to form an elastic deformation, thereby stably fixing the drive shaft 31 within the receiving cavity 12. The protruding left limiting wall 411 and right limiting wall 412 can conform to the shape of the drive shaft 31 to provide left and right auxiliary fixation for the drive shaft 31.

[0100] The guide groove 42 includes a left guide wall 421 and a right guide wall 422 facing the drive shaft 31, and a first surface 47 disposed between the left guide wall 421 and the right guide wall 422; the first surface faces the drive shaft 31 and is provided with a stepped groove 48, the stepped groove 48 corresponding to the shaft center seat 32 disposed on the drive shaft 31. In this embodiment, the guide groove 42 includes a second surface 49 facing the inner wall of the receiving cavity 12. The upwardly protruding left guide wall 421 and right guide wall 422, in conjunction with the upwardly protruding left limiting wall 411 and right limiting wall 412, can conform to the shape of the drive shaft 31 to form left and right auxiliary fixation on the drive shaft 31.

[0101] See Figure 7 , Figure 12 , 13Preferably, the arched protrusion 413 includes: a groove facing away from the drive shaft 31; and an anti-slip bone 4131 facing the drive shaft 31, the anti-slip bone 4131 matching the tooth groove 312. The arched protrusion 413 installs the anti-slip bone 4131, and the anti-slip bone 4131 cooperates with the tooth groove 312 to fix the tooth groove 312. In this embodiment, to adapt to the toothbrush head 10 which is narrow at the top and wide at the bottom, especially since the bamboo toothbrush head material is relatively fragile and cannot withstand large elastic compression, the width of the guide groove 42 can be made larger than the width of the limiting groove 41, forming a shape that is narrow at the top and wide at the bottom for better adaptation.

[0102] Preferably, the limiting groove 41 can be partially engaged within the guide groove 42, with the remaining portion protruding outside the guide groove 42. An arched groove 414 is provided on the back of the arched protrusion 413 of the limiting groove 41, allowing the arched protrusion 413 to have space for elastic deformation, thereby generating elastic force.

[0103] Example 4

[0104] Combination Figure 7 , Figure 14 and Figure 15 As shown, the spring device 40 includes a limiting groove 41 and a guide groove 42. The limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412. The arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412 to prevent the drive shaft 31 from displacing relative to the arched protrusion 413. One side of the arched protrusion 413 is provided with an arched groove 414.

[0105] The difference between this embodiment and embodiment 3 is that, preferably, a hollowed-out shape A can be provided between the left limiting wall 411 and the arched protrusion 413, and between the right limiting wall 412 and the arched protrusion 413, so that the arched protrusion 413 is more elastic.

[0106] Example 5

[0107] Combination Figure 7 , 16 As shown, the limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412; the arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412 to prevent the drive shaft 31 from displacing relative to the arched protrusion 413. One side of the arched protrusion 413 is provided with an arched groove 414.

[0108] Preferably, a hollowed-out shape A can be provided between the left limiting wall 411 and the arched protrusion 413, and between the right limiting wall 412 and the arched protrusion 413, so that the arched protrusion 413 is more flexible.

[0109] The difference between this embodiment and embodiment 4 is that it is adapted to toothbrush heads of uniform thickness, such as... Figure 16 As shown, the limiting groove 41 and the guide groove 42 have the same width and are integrally formed.

[0110] Example 6

[0111] Combination Figures 7-8 , Figures 17-18 As shown, this embodiment differs from Embodiment 3 in that at least one protruding cone 426 is provided at any of the left guide wall 421, the right guide wall 422, and the second surface 49, so that the guide groove 42 can be stably held in the receiving cavity 12. When the guide groove 42 is inserted into the receiving cavity 12, these protruding cones protrude into the inner wall of the receiving cavity 12, so that the guide groove 42 is stably fixed in the receiving cavity 12. In this embodiment, further preferably, at least one lateral protruding cone 426 in a laterally strip-shaped manner can be provided on each side of the guide groove 42; of course, multiple lateral protruding cones 426 can be provided on each side of the guide groove 42 according to actual needs.

[0112] In this embodiment, the spring device 40 is provided with a first protrusion 426A and a second protrusion 426B on one side, and a third protrusion 426C and a fourth protrusion 426D on the other side; the first protrusion 426A and the second protrusion 426B are arranged in parallel vertically and engage with one side of the receiving cavity 12; the third protrusion 426C and the fourth protrusion 426D are arranged in parallel vertically and engage with the other side of the receiving cavity 12, making the spring device 40 more compact and preventing it from falling off.

[0113] To accommodate the cone 426, a guide groove 425 is provided on the second surface 49 of the guide groove 42. This reduces the weight and thickness of the guide groove 42 body and increases the elastic deformation capability of the guide groove 42.

[0114] In this embodiment, the spring device 40 is a plastic spring device 40. The cone-shaped protrusions can be adapted to bamboo toothbrush heads 10 or plastic toothbrush heads 10. The plastic spring device 40 has a more uniform thickness, reducing dimensional changes during injection molding and increasing its plastic deformation capacity, which is beneficial for adjusting the mutual pressing force between the plastic spring device 40 and the drive shaft 31. Preferably, the cone-shaped protrusions 426 are dot-shaped, strip-shaped, or band-shaped. The cone-shaped protrusions 426 can be evenly distributed on the second surface 49, or distributed on the left guide wall 421 and the right guide wall 422.

[0115] Example 7

[0116] refer to Figures 19-21As shown, preferably, the toothbrush head 10 of this embodiment has a recessed mounting groove 11 at its top, and the brush blade assembly 20 is disposed within the mounting groove 11, making the brush blade assembly 20 more stable and reliable in use. The copper-free brush blade assembly 20 includes a connecting portion 21 and bristles 22 clustered and connected to the connecting portion 21. The bristles 22 are used for cleaning teeth. The size and shape of the mounting groove 11 correspond to the size and shape of the connecting portion 21 of the brush blade assembly 20, so that at least a portion of the connecting portion 21 can be embedded within the mounting groove 11, and can be flexibly inserted, removed, or replaced when needed.

[0117] Combination Figure 20 Figure 21 As shown, the bristles 22 are fixed in the connecting part 21 and exposed. The connecting part 21 is often made of solid solution. To further enhance the aesthetics and durability of the toothbrush head, the upper part of the connecting part 21 extends outward to cover the edge of the mounting groove 11, so that when looking from the bristles 22 towards the connecting part 21, the assembly gap between the connecting part 21 and the mounting groove 11 is not visible.

[0118] The toothbrush head 10 of this invention uses a copper-free bristle assembly 20, which reduces the occurrence of copper rust compared to copper-embedded bristles. The copper-free bristle assembly, fixed to the bamboo toothbrush head 10 handle with glue, reduces the occurrence of bristle detachment and copper rust compared to drilling holes directly in the bamboo toothbrush head and then using a copper-embedded bristle assembly where copper sheets hold the folded bristles 22 in place.

[0119] The electric toothbrush spring device 40 of the present invention optimizes the existing design, has a simpler structure, is more stable and reliable in use, greatly reduces costs, and has a better cleaning effect.

[0120] Example 8

[0121] Combination Figures 7-8 , Figure 22 , Figure 23 As shown, the limiting groove 41 includes a left limiting wall 411 and a right limiting wall 412 protruding towards the drive shaft 31; the arched protrusion 413 is disposed between the left limiting wall 411 and the right limiting wall 412, and arches towards the drive shaft 31 so that the drive shaft 31 presses against the arched protrusion 413 to form an elastic deformation, thereby stably fixing the drive shaft 31 in the receiving cavity 12. The protruding left limiting wall 411 and right limiting wall 412 can conform to the shape of the drive shaft 31 to form left and right auxiliary fixation of the drive shaft 31. Unlike embodiment 5, the limiting wall 411 and right limiting wall 412 extend further towards the drive shaft 31, increasing the height of the protrusion, which can further cover the three sides of the drive shaft, increase the contact area with the drive shaft 31, and further enhance stability.

[0122] The guide groove 42 includes a left guide wall 421 and a right guide wall 422 towards the drive shaft 31, and a stepped groove 48 disposed on the left guide wall 421 and the right guide wall 422, the stepped groove 48 corresponding to the shaft center seat 32 disposed on the drive shaft 31. The upwardly protruding left guide wall 421 and right guide wall 422, in conjunction with the upwardly protruding left limiting wall 411 and right limiting wall 412, can conform to the shape of the drive shaft 31 to form left and right auxiliary fixation on the drive shaft 31. Unlike embodiment 5, the left limiting wall 411 and right limiting wall 412 extend further towards the drive shaft 31, increasing the height of the protrusion, which can further cover the three sides of the drive shaft, increasing the contact area with the drive shaft 31, and further enhancing stability.

[0123] Example 9

[0124] Combination Figures 7-8 , Figures 24-25 As shown, the elastic device 40 in this embodiment can undergo some deformation. The spring device 40 includes a guide groove 42 disposed in the receiving groove 12 and corresponding to the drive shaft 31; the top of the guide groove 42 is connected to the limiting groove 41, and the bottom extends toward the mounting hole of the drive shaft 31.

[0125] The limiting groove 41 includes a limiting part 41A and an arched protrusion 413 disposed on the limiting part 41A. The arched protrusion 413 arches towards the drive shaft 31, so that the drive shaft 31 presses against the arched protrusion 413 to form an elastic deformation, thereby stably fixing the drive shaft 31 in the receiving cavity 12. The side of the limiting part 41A facing away from the drive shaft is provided as an arched groove 414.

[0126] The arched protrusion 413 includes an anti-slip rib 4131 disposed toward the drive shaft 31, the anti-slip rib 4131 matching the toothed groove 312. The arched protrusion 413 installs the anti-slip rib 4131, the anti-slip rib 4131 cooperating with the toothed groove 312 to fix the toothed groove 312.

[0127] The guide groove 42 includes a guide portion 42A, on which a stepped groove 48 is provided on the side facing the drive shaft 31. The stepped groove 48 corresponds to the shaft center seat 32 provided on the drive shaft 31. In this embodiment, the guide groove 42 includes a second surface 49 facing the inner wall of the receiving cavity 12.

[0128] In this embodiment, the limiting groove 41 and the guide groove 42 do not extend upwards to form sidewalls. This type of elastic device 40 is more suitable for some thicker or wider drive shafts and is fixed in the toothbrush head by mutual elastic pressure.

[0129] In this embodiment, in order to adapt to the toothbrush head 10 which is narrow at the top and wide at the bottom, especially since the bamboo toothbrush head material is relatively fragile and cannot withstand large elastic compression, the guide groove 42 can be wider than the limiting groove 41 to form a shape that is narrow at the top and wide at the bottom for better adaptation.

[0130] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

[0131] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric toothbrush head device with a built-in spring device, comprising a toothbrush head, a brush blade assembly, and an electric motor, wherein the bottom of the toothbrush head includes a drive shaft mounting hole, and a receiving cavity is provided in the toothbrush head along the drive shaft mounting hole toward the brush blade assembly; the electric motor includes a drive shaft, which passes through the drive shaft mounting hole and is disposed within the receiving cavity; characterized in that: The cavity is provided with a spring device, which abuts against the drive shaft. The spring device includes an arched protrusion that arches toward the drive shaft; The drive shaft facing the spring device has a toothed groove that matches the arched protrusion; the drive shaft presses against the arched protrusion to form an elastic deformation, thereby stably fixing the drive shaft in the receiving cavity.

2. The electric toothbrush head device with a built-in spring device as described in claim 1, characterized in that, The arched protrusion includes: An arched groove is provided facing away from the drive shaft; and An anti-slip rib is disposed toward the drive shaft, and the anti-slip rib matches the tooth groove.

3. The electric toothbrush head device with a built-in spring device as described in claim 1 or 2, characterized in that, The spring device includes a limiting groove, which includes a left limiting wall and a right limiting wall that protrude toward the drive shaft; the arched protrusion is disposed between the left limiting wall and the right limiting wall to prevent the drive shaft from displacing relative to the arched protrusion.

4. The electric toothbrush head device with a built-in spring device as described in claim 3, characterized in that, A hollow portion is provided between the arched protrusion and the left limiting wall and / or between the arched protrusion and the right limiting wall to enhance the elastic deformation capability of the arched protrusion.

5. The electric toothbrush head device with a built-in spring device as described in claim 2, characterized in that, The spring device includes a guide groove disposed in the receiving groove and corresponding to the drive shaft; The top of the guide groove is connected to the limiting groove, and the bottom extends toward the drive shaft mounting hole.

6. The electric toothbrush head device with a built-in spring device as described in claim 5, characterized in that, The guide groove includes: A left guide wall and a right guide wall protruding in the direction of the drive shaft, and a first surface disposed between the left guide wall and the right guide wall; The first surface faces the drive shaft and is provided with a stepped groove, which corresponds to the shaft center seat provided on the drive shaft.

7. The electric toothbrush head device with a built-in spring device as described in claim 6, characterized in that, The guide groove includes a second surface facing the inner wall of the receiving cavity, and the second surface is provided with a guide groove to increase the elastic deformation capability of the guide groove.

8. The electric toothbrush head device with a built-in spring device as described in claim 6 or 7, characterized in that, At least one protruding cone is provided at any of the left guide wall, the right guide wall, and the second surface so that the guide groove can be stably held in the receiving cavity.

9. The electric toothbrush head device with a built-in spring device as described in claim 8, characterized in that, The protrusions appear as dots, strips, or bands.

10. The electric toothbrush head device with a built-in spring device as described in claim 9, characterized in that, The protruding cone is disposed along the left guide wall and / or the right guide wall, and is parallel to the guide groove.

11. The electric toothbrush head device with a built-in spring device as described in claim 6, characterized in that, The drive shaft has a protruding rib on the side facing away from the tooth groove; the protruding rib is axially disposed on the shaft seat.

12. The electric toothbrush head device with a built-in spring device as described in claim 5 or 6, characterized in that, The width of the guide groove is greater than the width of the limiting groove.

13. The electric toothbrush head device with a built-in spring device as described in claim 1, characterized in that, The toothbrush head is made of bamboo; the spring device is made of plastic.

14. The electric toothbrush head device with a built-in spring device as described in claim 1 or 13, characterized in that, The toothbrush head has a mounting groove at the top, and the brush blade assembly is disposed in the mounting groove.

15. The electric toothbrush head device with a built-in spring device as described in claim 14, characterized in that, The brush assembly includes a connecting part disposed within the mounting groove, and a plurality of bristles disposed on the connecting part for cleaning teeth; the connecting part extends outward and covers the mounting groove.

16. A spring device for use in toothbrush heads, characterized in that, The spring device is installed inside the toothbrush head's receiving cavity and abuts against the drive shaft used to drive the toothbrush head's movement; The spring device includes a limiting groove and a guide groove arranged vertically, as well as an arched protrusion arranged on the limiting groove; the limiting groove and the guide groove are arranged in the receiving cavity and correspond to the drive shaft; The limiting groove includes a left limiting wall and a right limiting wall that protrude toward the drive shaft; the arched protrusion is disposed between the left limiting wall and the right limiting wall and arches toward the drive shaft so that the drive shaft presses the arched protrusion to form an elastic deformation so that the drive shaft is stably fixed in the receiving cavity.

17. The spring device for a toothbrush head as described in claim 16, characterized in that, The arched protrusion includes: An arched groove is provided facing away from the drive shaft; and An anti-slip rib is disposed toward the drive shaft, and the anti-slip rib matches the tooth groove.

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