Electric oral cleaning tool

Abstract

The electric oral cleaning device includes a housing (1), a transmission rod (2), and a brush head assembly (3), the brush head assembly (3) being movably connected to one end of the housing (1), a functional element (31) being provided on one side of the brush head assembly (3), a movable disc (32) being provided on the other side of the brush head assembly (3), the movable disc (32) being provided with a linking area, the linking area being provided off-center from the brush head assembly (3), the transmission rod (2) being provided inside the housing (1), the transmission rod (2) having an input end and an output end, the input end being connected to a transmission structure. the output end is coupled with the coupling region, and when the output end moves to a variable distance relative to the center of the movable disc (32), it can drive the coupling region to rotate together with the brush head assembly (3); the transmission rod (2) or at least the input end is integrally formed, the transmission rod (2) or at least the input end is made of a magnetizable material, and the output end is eccentric with respect to the longitudinal axis of the input end; the movable disc (32) is further provided with a limiting structure (33), which is used to axially limit the brush head assembly (3).

Description

[Technical Field]

[0001] The present invention relates to the technical field of toothbrushes, and in particular to powered oral cleaning devices. [Background technology]

[0002] Electric toothbrushes are currently a common oral cleaning tool and are mainly divided into sonic toothbrushes and rotary toothbrushes. Sonic brush heads mainly perform vibration cleaning by oscillating the brush head back and forth at high frequency, while rotary brush heads mainly perform efficient cleaning by rotating the brush head back and forth at high frequency, resulting in better cleaning results.

[0003] The typical rotary electric toothbrushes on the market transmit power to the brush handle via an eccentrically oscillating transmission structure, which then transmits power from the brush handle to the brush head via multiple parts. The need to assemble and connect multiple structures not only increases the difficulty of assembly and production, but also makes it easy for the brush head's oscillation amplitude to become inconsistent. Over time, gaps between parts increase, leading to increased noise and a weakening of the oscillation amplitude, which negatively impacts cleaning effectiveness and the user experience. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above, the present invention provides an electric oral cleaning tool to solve the problem that the electric toothbrushes of the prior art have poor consistency and are prone to adversely affect the cleaning effect and usage experience after long-term use. [Means for solving the problem]

[0005] In order to achieve one, some or all of the above objects or other objects, the present application provides: a housing, a transmission rod, and a brush head assembly; The brush head assembly is rotatably connected to one end of the housing, and a functional element is provided on one side of the brush head assembly, and a movable disk is provided on the other side of the brush head assembly, and a linking area is provided on the movable disk, and the linking area is provided offset from the center of the brush head assembly, The transmission rod is disposed within the housing, the transmission rod having an input end and an output end, the output end being eccentric relative to the input end in the axial direction of the transmission rod, the input end being used to connect to a transmission structure, the output end being associated with the linking region, and the output end driving the linking region to oscillate back and forth together with the brush head assembly when reciprocating so as to have a variable diameter relative to the center of the movable disc, the variable diameter meaning that the distance from the output end to the center of the movable disc changes during the reciprocating motion; The transmission rod or at least the input end is integrally formed, The present invention proposes an electric oral cleaning tool, wherein the transmission rod or at least the input end is made of a magnetizable material.

[0006] Furthermore, the connecting area is a groove, a guide rod is provided at the output end, the guide rod is positioned within the groove, and the distance from the guide rod to the center of the brush head assembly is between 2mm and 4mm.

[0007] Furthermore, the guide rod has a connecting block extending from the end away from the brush head assembly, a limiting groove is provided inside the housing, and the connecting block is positioned within the limiting groove and is capable of moving vertically within the limiting groove.

[0008] Furthermore, the linking region is a fixed rod, a connection hole is provided at the output end, the fixed rod is positioned within the connection hole, and when the connection hole moves vertically, the fixed rod moves horizontally within the connection hole.

[0009] Furthermore, the output end and the input end are connected by means of bending, welding or assembly, and the projection of the output end is an "L" shape, a "T" shape or a concave groove shape.

[0010] Furthermore, the transmission rod or at least the input end is made of a plastic material mixed with magnetic powder.

[0011] Furthermore, a guide ring is fixed to the inner wall of the housing, and the transmission rod passes through the guide ring and is capable of reciprocating vertically within the guide ring.

[0012] Furthermore, the maximum reciprocating stroke of the transmission rod in the vertical direction is 1 to 5 mm, and the rotation angle of the brush head assembly is between -38° and 38°.

[0013] Furthermore, the magnetic attraction force of the output terminal is set to a value between 3.5N and 35N.

[0014] Furthermore, the shortest distance from the center point of the guide rod to the center axis of the input end is 1.5 to 4.5 mm. [Effects of the Invention]

[0015] The implementation of embodiments of the present invention provides the following beneficial effects.

[0016] In the electric oral cleaning tool of the present invention, the transmission rod is integrally formed and can drive the groove when it reciprocates vertically within the groove, while the rotating shaft and limiting structure can restrict the movable disc so that the movable disc can only rotate reciprocally in the vertical plane, thereby driving the functional elements provided on the brush head assembly to rotate. Since the transmission structure transmits power to the movable disc via the transmission rod, the number of parts is small, energy loss during transmission is low, the impact of large gaps between parts on the overall transmission process is relatively small, and noise and vibration amplitude are not significantly affected even after long-term use. [Brief explanation of the drawings]

[0017] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following will briefly describe the drawings that need to be used in the description of the embodiments or the prior art. However, the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without paying creative labor. [Figure 1] 1 is a side view of an embodiment of the electric oral cavity cleaning tool proposed in the present application. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 3 is an enlarged view of part B in FIG. [Figure 4] FIG. 2 is a cross-sectional view of another cross section of an embodiment of the electric oral cleaning tool proposed in the present application. [Figure 5] FIG. 1 is a structural schematic diagram of an embodiment of the electric oral cavity cleaning tool proposed in the present application, without showing the housing. [Figure 6] 1 is a schematic diagram of an embodiment of the electric oral cleaning device proposed in the present application in an operating state without showing the housing. [Figure 7] FIG. 10 is a structural schematic diagram of the housing of another embodiment of the electric oral cleaning tool proposed in the present application. [Figure 8] FIG. 10 is a structural schematic diagram of another embodiment of the electric oral cleaning tool proposed in the present application, without showing the housing. [Figure 9] FIG. 10 is a structural schematic diagram of yet another embodiment of the electric oral cleaning tool proposed in the present application, without showing the housing. [Figure 10] 1 is a structural schematic diagram of one embodiment of the electric oral cavity cleaning tool proposed in the present application. [Figure 11] 1 is a schematic diagram of the internal structure of the electric oral cleaning tool proposed in the present application when assembled to the handle. [Figure 12] 1 is a cross-sectional side view of the electric oral cleaning tool proposed in the present application assembled to the handle. [Figure 13]1A and 1B are schematic diagrams illustrating the electric oral cleaning tool proposed in the present application assembled to a handle and disassembled from the handle. DETAILED DESCRIPTION OF THE INVENTION

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in the specification of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The terms "comprise" and "have" and variations thereof in the specification and claims of the present application and the brief description of the drawings above are intended to cover a non-exclusive inclusion. The terms "first," "second," etc. in the specification and claims of the present application or the drawings above are intended to distinguish between different objects and not to describe a particular order.

[0019] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various places throughout the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] In order to make those skilled in the art better understand the aspects of the present application, the following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the drawings.

[0021] With reference to FIGS. 1 to 6, the present application proposes an electric oral cleaning tool, which includes a housing 1, a transmission rod 2, and a brush head assembly 3, The brush head assembly 3 is rotatably connected to one end of the housing 1, and a functional element 31 is provided on one side of the brush head assembly 3, which may include multiple sets of bristles as shown in Fig. 1, or may be a tongue cleaner such as the tongue coating cleaning brush head shown in Fig. 10 or other assembly such as a soft rubber cleaner, in which case the electric oral cleaning tool can be used as a tongue coating cleaner. Specifically, a movable disc 32 is provided on the other side of the brush head assembly 3, and a connecting region is provided on the movable disc 32, and the connecting region is provided offset from the center of the brush head assembly 3. The transmission rod 2 is disposed within the housing 1 and has an input end and an output end. The input end of the transmission rod 2 is used for connecting to the transmission structure and is cylindrical or approximately cylindrical, such as an elliptical cylinder. The input end extends into the cavity of the housing and is integrally molded. The output end of the transmission rod 2 is the end close to the brush head assembly 3, and includes a guide rod 21 or a connecting hole 22 that fits into the coupling area, and a connecting rod that connects the guide rod 21 or the connecting hole 22 to the input end. The shortest distance from the center point of the guide rod 21 to the central axis of the input end is 1.5 to 4.5 mm, and the distance from the guide rod 21 to the center of the brush head assembly 3 is 2 to 4 mm. The output end and the input end may be integrally molded by bending, and then a connection block 211 may be connected to the output end by welding or crimping. The output end is eccentric to the input end in the axial direction of the transmission rod 2, and is used to connect to the transmission structure. The output end is linked to the linking region, and when the output end reciprocates with a variable diameter relative to the center of the movable disc 32, it drives the linking region to swing back and forth together with the brush head assembly 3. The variable diameter means that the distance from the output end to the center of the movable disc 32 changes during reciprocation. The output end of the transmission rod 2 is adapted and connected to the linking region, and when the output end reciprocates vertically, it drives the linking region to rotate together with the brush head assembly 3.When the housing 1 is inserted into the toothbrush handle, the top end of the transmission structure provided within the toothbrush handle is magnetically attached to the transmission rod 2, driving the transmission rod 2 to reciprocate vertically. The transmission structure may be a conventional structure, which will not be described in detail here. The movement locus of the transmission rod 2 is perpendicular to the horizontal line, so that the output end moves at a variable distance from the center of the movable disc. That is, the distance from the output end to the center of the movable disc constantly changes during movement. The lower end of the transmission rod 2 is close to the transmission structure, and the transmission rod 2 is arranged axially symmetrically with respect to the longitudinal axis of the brush head assembly 3, and the upper end of the transmission rod 2 is gradually offset to one side. In this embodiment, the coupling region is an oval groove 321, and a guide rod 21 is provided at the upper end of the transmission rod 2. That is, one side of the transmission rod 2 is projected to resemble a "7" shape. The guide rod 21 is located within the groove 321, and when the guide rod 21 moves back and forth vertically together with the transmission rod 2, the guide rod 21 drives the groove 321 to rotate. The oval groove 321 provides sufficient space for the movement of the guide rod 21. The vertical movement of the guide rod 21 drives the groove 321 to rotate around the center point of the brush head assembly 3, and the brush head assembly 3 rotates together with the groove 321. The rotation direction is shown by the arrow in FIG. 6 . Taking the direction shown in Figure 6 as an example, when the transmission rod 2 moves upward, the brush head assembly 3 rotates to the right, and when the transmission rod 2 moves downward, the brush head assembly 3 rotates to the left. The transmission structure drives the transmission rod 2 to move up and down frequently, and the brush head assembly 3 rotates left and right at high speed, thereby driving the functional element 31 on the other side of the brush head assembly 3 to rotate at high speed. Taking a toothbrush as an example, teeth cleaning can be achieved. The brush head assembly 3 is rotatably connected to one end of the housing 1. Specifically, a rotating shaft 34 is inserted into the movable disc 32. The rotating shaft 34 is located at the center of the brush head assembly 3, and one end of the rotating shaft 34 abuts against the housing 1. The rotating shaft 34 is fixed inside the movable disc 32 after assembly, and the movable disc 32 drives the brush head assembly 3 to rotate together around the rotating shaft 34.The movable disc 32 is provided with a limiting structure 33, which is used to axially limit the brush head assembly 3. As shown in FIG. 4 , the movable disc 32 is provided with a longitudinally opening receiving groove 322, and a longitudinal through-hole is drilled in the housing 1. The limiting structure 33 is inserted into the receiving groove 322 through the through-hole and abuts against the side wall of the receiving groove 322, and the receiving groove 322 is rotatable relative to the limiting structure 33. The rotating shaft 34 prevents the movable disc 32 from moving horizontally or vertically, and the limiting structure 33 prevents the movable disc 32 from moving along the extension direction of the rotating shaft 34, so that the movable disc 32 can only rotate in the circumferential direction. In this embodiment, the limiting structure 33 is a limiting pin.

[0022] In another embodiment, as shown in Figure 9, the linking region is a fixed rod 35 provided on the movable disc, the fixed rod 35 is eccentrically provided, and a connecting hole 22 is provided at the output end thereof, the fixed rod 35 is located within the connecting hole 22, and the connecting hole 22 is also elliptical. When the connecting hole 22 moves vertically, the fixed rod 35 moves horizontally within the connecting hole 22. The working principle is similar to that of the above embodiment, and therefore will not be described in detail here.

[0023] In this embodiment, the orthogonal projection of the movable disc 32 has two arcuate shapes sharing one chord, and the distance from the center of the groove 321 to the center of the brush head assembly 3 is equal to the distance from the center of the brush head assembly 3 to the other edge of the movable disc 32. However, the former distance may be slightly longer than the latter distance. The longer the former distance, the more the side wall of the groove 321 receives an upward force when the guide rod 21 moves upward. This force exerts a longer torque, reducing the force required to rotate the movable disc 32 and saving labor. In addition, taking into consideration the size of the housing 1 and the stability of transmission, it is preferable that the former distance and the latter distance be equal.

[0024] In another embodiment, as shown in FIGS. 7 and 8 , a connecting block 211 is extended from the end of the guide rod 21 away from the brush head assembly 3, and a limiting groove 12 is provided inside the housing 1. The connecting block 211 is positioned within the limiting groove 12 and is vertically movable within the limiting groove 12. The limiting groove 12 restricts the connecting block 211, making the transmission rod 2 less likely to vibrate, and the distance from the rotation axis 34 to the vertical line on which the guide rod 21 moves is always constant. In this process, the distance between the guide rod 21 and the rotation axis 34 is variable, and the maximum vertical movement stroke of the transmission rod 2 is 1 to 5 mm. Preferably, the maximum movement stroke is 1.5 to 3.5 mm, and the rotation angle of the brush head assembly 3 is between -38° and 38°, allowing for sufficient tooth cleaning.

[0025] Furthermore, a guide ring 13 is fixed to the inner wall of the housing 1, and the transmission rod 2 passes through the guide ring 13 and can reciprocate vertically within the guide ring 13. The guide ring 13 serves to guide and restrict the transmission rod 2, preventing it from shifting during movement. In this embodiment, symmetrical locking blocks are provided on the outer wall of the guide ring 13, and symmetrical locking grooves are provided at corresponding positions on the inner wall of the housing 1, with the locking blocks and locking grooves fitting together. Once engaged, the position of the guide ring 13 is fixed and does not move with the movement of the transmission rod 2. Furthermore, since the inner diameter of the guide ring 13 matches the outer diameter of the input end of the transmission rod 2, friction is relatively small, wear during transmission is relatively small, and deflection of the transmission rod 2, which can adversely affect use, is avoided.

[0026] In this embodiment, the transmission rod 2 is integrally molded. The end of the transmission rod 2 away from the brush head assembly 3 has a horizontal end surface, which can be adapted to a general transmission structure. At least the input end of the transmission rod 2 is made of a magnetizable metal material. In another embodiment, at least the input end of the transmission rod 2 is made of a plastic material mixed with magnetic powder. That is, the input end of the transmission rod 2 can be connected and fixed to the output end of the transmission structure through magnetic attraction. Referring to Figure 11, a handle 4 is used in combination with the electric oral cleaning tool. The handle 4 is connected to the lower end of the housing 1. A transmission mechanism 5 and a motor 6 are provided within the handle 4. The output end of the motor 6 is connected to the proximal end of the transmission mechanism 5. A storage battery 7 is further provided within the handle 4. The storage battery 7 is located at the lower end of the motor 4 and is electrically connected to the motor 4. Specifically, the transmission mechanism 5 includes a drive gear 51, a driven gear 52, and a transmission rod 53. The drive gear 51 is fitted onto the output shaft of the motor 6 and rotates together with the output shaft of the motor 6. The motor 6 is fixedly connected to the inner wall of the handle 4. The output shaft of the motor 6 is arranged in the same direction as the handle 4, specifically, arranged upward along the longitudinal direction of the handle 4. The drive gear 51 is connected to the output shaft of the motor 6 so as to be rotatable horizontally. The driven gear 52 is a bevel gear, and the driven gear 52 and the drive gear 51 are perpendicular to each other. The driven gear 52 and the drive gear 51 mesh with each other, converting horizontal rotation into vertical rotation. The transmission rod 53 is connected to the driven gear 52 so as to be rotatable. The motor 6 drives the drive gear 51 to rotate horizontally and also drives the driven gear 52 to rotate vertically. The driven gear 52 then drives the transmission rod 53 to reciprocate up and down. Specifically, a sleeve 54 is provided at the lower end of the transmission rod 53, an eccentric column 55 is provided on the driven gear 52, the sleeve 54 is fitted onto the eccentric column 55, and a horizontal rotation shaft 56 is provided on the driven gear 52, the rotation shaft 56 penetrates along the axial direction of the eccentric column 55 and passes through the bottom of the sleeve 54, and both ends of the rotation shaft 56 are rotatably connected to the inner wall of the handle 4 to rotatably support the driven gear 52, the driven gear 52 drives the eccentric column 55 to rotate around the rotation shaft 56, the sleeve 54 swings up and down as the eccentric column 55 rotates, and further drives the entire transmission rod 53 to reciprocate up and down. The upper end of the transmission rod 53 is provided with a magnetic connection part 57 for connecting to the transmission rod 2 by magnetic attraction, and the proximal end of the transmission rod 2 is made of a magnetizable material, so that the transmission rod 53 can ultimately drive the functional element 31 to swing and clean the user's mouth. The transmission mechanism 5 has a magnetic connector, and the magnetic attractive forces between the proximal end of the transmission rod 2 and the magnetic connector are set between 3.5N and 35N, preferably between 3.5N and 20N, for example, 15N. When the magnetic attractive force is set to 15N, first, the toothbrush will not come off during vibration with a connection strength of 15N. Second, the toothbrush can be easily removed when used by an adult, and can be easily removed by a forceful pull when used by a child to replace the toothbrush head. More specifically, as shown in Figures 12 and 13, Figures 12 and 13 show the brush head and brush handle when connected. That is, when the brush head and brush handle are connected, there are two magnetic attractive forces: the connecting force between the brush head and the brush handle body engaging portion and the proximal end and the magnetic connector. JPEG2026504511000012.jpg79170 JPEG2026504511000013.jpg73170 JPEG2026504511000014.jpg59170 From the above test data, it was found that the average insertion / extraction force at the engagement part was approximately 7 to 8 N, and the individual magnetic attraction force was approximately 9 to 15 N. This data mainly reflects the insertion / extraction force at the engagement part. JPEG2026504511000015.jpg99170 JPEG2026504511000016.jpg59170 From the results in Tables 1 to 5 above, it can be seen that the insertion / removal force at the engagement part itself is 7 to 8 N, and after subtracting the engagement force, the maximum allowable force for adults is basically within 35 N and for children is within 20 N. In other words, 20 N is the optimal force for both adults and children to be able to successfully replace the toothbrush head and have high connection strength.

[0027] Obviously, the above examples are only some of the examples of the present application, not all of the examples. The drawings illustrate preferred embodiments of the present application, but do not limit the scope of the claims of the present application. The present application may be implemented in many different forms. On the contrary, these examples are provided to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the above examples, those skilled in the art may modify the technical solutions described in each of the above specific embodiments or replace some of the technical features with equivalents. Equivalent structures created using the contents of the specification and drawings of the present application, even if directly or indirectly applied to other related technical fields, are also included within the scope of the claims of the present application. [Explanation of symbols]

[0028] 1. Housing 12 Restriction groove 13 Guide ring 2 Transmission rod 21 Guide rod 211 Connection Block 22 Connection hole 3 Brush Head Assembly 31 Functional Elements 32 Movable disc 321 Groove 322 Storage groove 33 Restrictive Structure 34 Rotation axis 35 Fixed rod 4 Handle 5 Transmission mechanism 51 Drive gear 52 Driven gear 53 Transmission rod 54 Sleeve 55 Eccentric column 56 Rotating shaft 57 Magnetic connection 6 motors 7. Storage battery

Claims

1. An electric oral cleaning device, comprising: a housing; a transmission rod; and a brush head assembly; The brush head assembly is rotatably connected to one end of the housing, and a functional element is provided on one side of the brush head assembly, and a movable disk is provided on the other side of the brush head assembly, and a linking area is provided on the movable disk, and the linking area is provided offset from the center of the brush head assembly, The transmission rod is disposed within the housing, the transmission rod having an input end and an output end, the output end being eccentric relative to the input end in the axial direction of the transmission rod, the input end being used to connect to a transmission structure, the output end being associated with the linking region, and the output end driving the linking region to oscillate back and forth together with the brush head assembly when reciprocating so as to have a variable diameter relative to the center of the movable disc, the variable diameter meaning that the distance from the output end to the center of the movable disc changes during the reciprocating motion; The transmission rod or at least the input end is integrally formed, The electric oral cleaning tool, wherein the transmission rod or at least the input end is made of a magnetizable material.

2. The electric oral cleaning tool of claim 1, wherein the connecting area is a groove, a guide rod is provided at the output end, the guide rod is located within the groove, and the distance from the guide rod to the center of the brush head assembly is between 2 mm and 4 mm.

3. The electric oral cleaning tool of claim 2, wherein the guide rod has a connecting block extending from an end remote from the brush head assembly, a limiting groove is provided inside the housing, and the connecting block is positioned within the limiting groove and is vertically movable within the limiting groove.

4. The electric oral cleaning tool of claim 1, characterized in that the connecting region is a fixed rod, a connection hole is provided at the output end, the fixed rod is positioned within the connection hole, and when the connection hole moves vertically, the fixed rod moves horizontally within the connection hole.

5. The electric oral cleaning tool according to claim 1, characterized in that the output end and the input end are connected by means of bending, welding or assembly, and the projection of the output end is an "L" shape, a "T" shape or a concave groove shape.

6. 2. The electric oral cleaning tool according to claim 1, wherein the transmission rod or at least the input end is made of a plastic material mixed with magnetic powder.

7. The electric oral cleaning tool according to claim 1, wherein a guide ring is fixed to an inner wall of the housing, and the transmission rod passes through the guide ring and is capable of reciprocating vertically within the guide ring.

8. 2. The electric oral cleaning tool according to claim 1, wherein the maximum reciprocating stroke of the transmission rod in the vertical direction is 1 to 5 mm, and the rotation angle of the brush head assembly is between -38° and 38°.

9. 2. The electric oral cleaning tool according to claim 1, wherein the magnetic attraction force of the output end is set to a value between 3.5N and 35N.

10. The electric oral cleaning tool according to claim 2, wherein the shortest distance from the center point of the guide rod to the center axis of the input end is 1.5 to 4.5 mm.

11. An electric oral cleaning device, comprising: a housing; a transmission rod; and a brush head assembly; The brush head assembly is rotatably connected to one end of the housing, and a functional element is provided on one side of the brush head assembly, and a movable disk is provided on the other side of the brush head assembly, and a linking area is provided on the movable disk, and the linking area is provided offset from the center of the brush head assembly, the transmission rod is disposed within the housing, the transmission rod has an input end and an output end, the output end is disposed eccentrically relative to the input end in an axial direction of the transmission rod, the input end is used to connect to a transmission structure, the output end is coupled to the coupling region, and the output end drives the coupling region to reciprocate and oscillate together with the brush head assembly; The transmission rod or at least the input end is integrally formed, The electric oral cleaning tool, wherein the transmission rod or at least the input end is made of a magnetizable material.

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