Toothbrush head for electric toothbrush

Abstract

The invention discloses a toothbrush head for an electric toothbrush. The toothbrush head comprises a brush disc, a brush head shell and a swing rod which can be contained in the brush head shell in a swing mode. The swing rod is jointed and drives the brush disc; wherein a containing seat of the brush head shell is provided with a buckle, the buckle is arranged on a buckle stand column protruding out of the middle of the containing seat, a buckle guide groove and a buckle joint groove are formed in a mounting block of the brush disc, the buckle guide groove is communicated with the buckle joint groove, and the buckle can be inserted into the buckle guide groove along a rotating axis and enters the buckle joint groove after rotating. When the swing rod is connected with the brush disc, one part of the swing rod is inserted into the buckle guide groove, and the buckle at the containing seat is prevented from being separated from the buckle connecting groove through the guide groove. Therefore, according to the toothbrush head disclosed by the invention, the reliable rotatable connection between the brush disc and the brush head shell is realized, and meanwhile, the requirements of simple and convenient manufacturing process and low cost are met.

Description

Technical Field

[0001] The present invention relates to the technical field of oral care devices, and in particular to a toothbrush head for an electric toothbrush. Background Art

[0002] There is an electric toothbrush on the market that uses a toothbrush head with a rotating brush disc. This type of toothbrush head is connected to the drive shaft of the main body of the electric toothbrush, and a swing rod is provided in the toothbrush head. The swing rod is directly connected to the drive shaft, and the end of the swing rod drives the brush disc. The swing rod is driven by the drive shaft of the electric toothbrush to transmit the reciprocating rotation of the drive shaft around the rotation axis to the brush disc, so that the brush disc reciprocates around the central axis of the brush disc.

[0003] There is another toothbrush head on the market, in which a metal brush head drive shaft is provided, which is connected to a plastic swing rod and passes through a hollow area in the brush disc, and the brush head drive shaft can be used to drive the brush disc and also restrict the brush disc from being separated from the brush head housing. However, the metal brush head drive shaft is additionally provided in the toothbrush head, which is relatively expensive and time-consuming and labor-intensive to manufacture.

[0004] In order to reduce the manufacturing cost of the brush head, some toothbrush heads have omitted the metal brush head drive shaft and are only rotatably connected together through the matching structure of the brush disc and the brush head shell. For example, the bottom surface of the brush disc is fixedly connected to the flange, and the outer side of the flange is provided with a sliding groove. The shell of the toothbrush head is provided with a flange hook. When the brush disc is matched with the shell, the flange hook is elastically deformed and embedded in the sliding groove of the flange to form a swing fit. However, this design of the toothbrush head ignores the problem of brush head safety when reducing costs. The brush disc is easy to fall off the brush head shell. Once the plastic parts are worn and aged after a long period of use, the brush disc is easy to fall off the toothbrush head shell, which is very dangerous for the user when using it.

[0005] Therefore, it is desired to have a toothbrush head that can achieve reliable assembly of the brush disc and the brush head housing at a relatively low cost. Summary of the invention

[0006] To overcome the deficiencies of the prior art, the present invention provides a toothbrush head for an electric toothbrush, comprising: a brush disc, the brush disc having a brush disc base and a mounting block formed on the lower side of the brush disc base; a brush head shell, the brush head shell forming a cavity, and one end of the brush head shell forming a receiving seat for receiving the mounting block, the other end of the brush head shell leading to the open end of the cavity, the brush disc being arranged in the receiving seat for rotating around a rotation axis A1; and a swing rod, the swing rod being swingably received in the cavity, the swing rod engaging and driving the brush disc; wherein the receiving seat is provided with a buckle, the buckle being arranged on a buckle column protruding from the middle of the receiving seat, a buckle guide groove and a buckle engagement groove being formed in the mounting block of the brush disc, the buckle guide groove and the buckle engagement groove being connected, the buckle being able to be inserted into the buckle guide groove along the rotation axis A1, and entering the buckle engagement groove after rotation, and when the swing rod engages the brush disc, a part of the swing rod is inserted into the buckle guide groove, preventing the buckle at the receiving seat from being disengaged from the engagement with the buckle engagement groove through the guide groove.

[0007] The upper toothbrush head is inserted through the snap-in guide groove by means of a buckle, and after rotation, it can be reciprocatingly connected together in cooperation with the snap-in matching groove. The cooperation between the buckle and the buckle engaging groove is locked by the rocker rod, and the buckle is kept received in the buckle engaging groove and will not fall out. Only by removing the rocker rod can the buckle be rotated to the position where the buckle guide groove is aligned, and the buckle can be disengaged from the buckle engaging groove, thereby allowing the brush disc to be disengaged from the brush head housing. Therefore, the toothbrush head of the present invention not only realizes a reliable rotatable connection between the brush disc and the brush head housing, but also meets the requirements of simple manufacturing process and low cost.

[0008] According to one aspect of the present invention, the swing rod includes an integrally formed swing rod cam, which is formed on the outer surface of one end of the swing rod adjacent to the accommodating seat and is offset to one side of the swing axis A2 of the swing rod; the mounting block of the brush plate is formed with a follower recess, which is engaged with the follower recess by the swing rod cam, and the swing rod drives the brush plate to reciprocate around the rotation axis A1, and a portion of the swing rod inserted into the buckle guide groove is the swing rod cam, and the buckle guide groove includes a portion of the follower recess, so that the swing rod cam blocks the buckle from escaping through the buckle guide groove. The present invention uses the swing rod cam to block the buckle from escaping, thereby ensuring a reliable rotation connection.

[0009] According to another aspect of the present invention, the accommodating seat has an annular outer wall and a bottom wall, the buckle pillar protrudes from the bottom wall, the pair of buckles extend from opposite sides of the buckle pillar, and the buckles are spaced a distance from the bottom wall of the accommodating seat.

[0010] According to another aspect of the present invention, the accommodating seat forms a pivot hole below the buckle pillar, the pivot hole extends along a swing line A2 perpendicular to the rotation axis A1, and one end of the swing rod is pivotally connected in the pivot hole.

[0011] According to another aspect of the present invention, the mounting block of the brush plate forms a central hole for inserting the clip pillar, the clip guide groove includes a portion of the follower recess and a recess radially recessed from the central hole along the relative rotation axis A1, and the paired clips are respectively guided through a portion of the follower recess and the recess into the clip engagement groove.

[0012] According to another aspect of the present invention, when the rocker cam is engaged with the follower recess, the swing of the rocker around the swing axis A2 drives the brush plate to rotate around the rotation axis A1 within a predetermined rotation angle range, and within the predetermined rotation angle range, the buckle is always engaged with the buckle engagement groove.

[0013] According to another aspect of the present invention, the swing cam is formed in the shape of a single conical tooth, and the follower recess of the brush plate is correspondingly formed with a conical tooth groove for receiving the conical tooth. When the swing cam engages the follower recess, the swing cam occupies the portion of the follower recess that serves as the buckle guide groove to prevent the buckle from being disengaged from the buckle guide groove. The conical tooth drives the conical tooth groove to move, and the shape matching of the cam and the follower recess is better. During the rotation of the brush plate, the conical tooth cam occupies the space of the follower recess that constitutes the guide groove to prevent the buckle from being disengaged.

[0014] According to another aspect of the present invention, the outer diameter of the brush plate base is larger than the outer diameter of the brush plate mounting block, and at least part of the outer surface of the mounting block is rotatably matched with the inner surface of the annular outer wall of the accommodating seat.

[0015] According to another aspect of the present invention, a stop sleeve is further provided in the cavity of the brush head housing, and the stop sleeve is inserted into the open end of the cavity of the brush head housing, thereby ensuring that the swing rod will not deviate from the position of the cavity of the brush head housing.

[0016] According to another aspect of the present invention, the brush plate, the swing rod and the brush head housing are respectively formed integrally of resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] For a more complete understanding of the present invention, reference may be made to the following description of exemplary embodiments considered in conjunction with the accompanying drawings, in which:

[0018] Figure 1 A cross-sectional view of a toothbrush head for an electric toothbrush according to a preferred embodiment of the present invention is shown.

[0019] Figure 2 A three-dimensional view of a brush head housing of a toothbrush head according to a preferred embodiment of the present invention is shown.

[0020] Figure 3 A front view of a brush head housing of a toothbrush head according to a preferred embodiment of the present invention is shown.

[0021] Figure 4A three-dimensional view of a brush plate of a toothbrush head according to a preferred embodiment of the present invention is shown.

[0022] Figure 5 A bottom plan view of a brush plate of a toothbrush head according to a preferred embodiment of the present invention is shown.

[0023] Figure 6 A cross-sectional view of a brush plate of a toothbrush head according to a preferred embodiment of the present invention is shown.

[0024] Reference numerals:

[0025] 1 Toothbrush Head

[0026] 10. Brush the plate

[0027] 11 Brush plate base

[0028] 12 Mounting Blocks

[0029] 121 Buckle guide groove

[0030] 121' Notch

[0031] 123 snap-fit ​​groove

[0032] 125 follower recess

[0033] 126 center hole

[0034] 20 brush head housing

[0035] 21 Cavity

[0036] 210 open end

[0037] 22 Seats

[0038] 23 buckles

[0039] 24 snap-on columns

[0040] 25 pivot holes

[0041] 26 outer wall

[0042] 27 bottom wall

[0043] 30 swing rod

[0044] 31 rocker cam

[0045] 32 terminal

[0046] 33 convex part

[0047] 50 stop sleeve

[0048] 60 Cleaning elements

[0049] A1 Rotation axis

[0050] A2 Swing axis DETAILED DESCRIPTION

[0051] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0052] Figure 1 The toothbrush head 1 for an electric toothbrush according to a preferred embodiment of the present invention is shown. The toothbrush head 1 mainly includes a brush head housing 20, a brush disc 10 installed at one end of the brush head housing 20, and a swing rod 30 arranged in a cavity 21 of the brush head housing 20. The inside of the swing rod 30 is configured to be suitable for inserting a drive shaft of an electric toothbrush. With the reciprocating rotation of the drive shaft, the swing rod 30 reciprocates around the swing axis A2, thereby driving the brush disc 10 to reciprocate around its rotation axis A1 within a predetermined rotation angle range. A cleaning element 60 such as bristles is installed on the brush disc 10, and the cleaning element 60 reciprocates with the brush disc 10, thereby achieving the action of cleaning teeth.

[0053] Figure 2 and Figure 3 The three-dimensional view and the plan view of the brush head housing 20 of the toothbrush head 1 according to the preferred embodiment of the present invention are respectively shown. A receiving seat 22 for receiving the brush plate 10 is formed at one end of the brush head housing 20, and a cavity 21 extends from the receiving seat 22. The receiving seat 22 has a substantially annular outer wall 26 and a bottom wall 27 on one side of the outer wall 26, and the other side of the receiving seat 22 is open to insert the mounting block 12 of the brush plate 10. The shape and size of the cavity 21 are set to be able to set the swing rod 30 and allow the swing rod 30 to reciprocate around the swing axis A2 therein. The cavity 21 of the brush head housing 20 is connected with the receiving seat 22, so that the swing rod 30 will be inserted into the receiving seat 22 from the cavity 21. The outer contour of the brush head housing 20 is roughly conical, the outer diameter of the front end close to the receiving seat 22 is relatively small, and the outer diameter of the housing 20 at the open end 210 is relatively large.

[0054] Figure 1 It is shown that the swing rod 30 is arranged in the cavity 21 of the brush head housing 20. A pivot hole 25 is integrally formed in the receiving seat 22 of the brush head housing 20, and the pivot hole 25 extends substantially perpendicular to the rotation axis A1. The end of the swing rod 30 is pivotally received in the pivot hole 25. The swing rod 30 also includes a swing rod cam 31, which is formed near the end of the swing rod 30 received in the pivot hole 25. The swing rod cam 31 is offset to one side of the rotation axis A1. In other words, the swing rod cam 31 is offset relative to the end received in the pivot hole 25.

[0055] The swing rod cam 31 is configured to engage with the follower recess 125 on the brush plate 10 and drive it to rotate. Preferably, the swing rod cam 31 is formed in the shape of a single conical tooth, for example, and the follower recess 125 on the brush plate 10 is correspondingly a receiving tooth groove of the conical tooth. As the swing rod 30 reciprocates around the swing axis A2, the brush plate 10 can rotate around the rotation axis A1 within a certain rotation angle range, and the rotation angle range is, for example, 40°-60°.

[0056] like Figure 1 As shown, the brush plate 10 is connected to the receiving seat 22 of the brush head housing 20 through a snap-fit ​​structure. Figure 2 As shown, a snap-on support 24 is protrudingly formed in the middle position of the bottom wall 27 of the receiving seat 22 of the brush head housing 20, and the top of the snap-on support 24 extends outward to form a snap 23. In a preferred embodiment, the pairs of snaps 23 extend radially outward from both sides of the support in the shape of convex sheets, and the snaps 23 are separated from the inner surface of the bottom wall 27 of the receiving seat 22 by a distance. The top surface of the snap 23 is preferably flush with or slightly lower than the top surface of the annular outer wall of the receiving seat 22.

[0057] On the other hand, Figure 5 and Figure 6 As shown, the brush plate 10 is formed with a brush plate base 11 and a mounting block 12 arranged on the lower side of the brush plate base 11. The mounting block 12 of the brush plate 10 forms a center hole 126 in the direction of the rotation axis A1, and the outer diameter of the mounting block 12 is smaller than the outer diameter of the brush plate 10. The outer surface of the mounting block 12 has a diameter and size that matches the inner surface of the outer wall 26 of the accommodating seat 22, and is suitable for rotating in the accommodating seat 22. In order to connect to the buckle 23 provided in the middle of the accommodating seat 22 of the brush head housing 20, the mounting block 12 of the brush plate 10 is formed with a buckle guide groove 121 and a buckle engagement groove 123. The buckle guide groove 121 is farther away from the brush plate base 11 than the buckle engagement groove 123, and the buckle guide groove 121 is connected to the buckle engagement groove 123. Figure 5As shown, the buckle guide groove 121 is configured to allow the buckle 23 in the receiving seat 22 to be inserted and guided into the buckle engagement groove 123, and rotated into an engagement state with the buckle engagement groove 123. In a preferred embodiment, the buckle 23 is inserted into the buckle guide groove 121 and then moves toward the brush plate base 11, and then rotates 90 degrees to enter the buckle engagement groove 123, so that the buckle 23 is engaged with the buckle engagement groove 123. On the contrary, if the brush plate 10 rotates 90 degrees in the opposite direction, the buckle 23 will be aligned with the buckle guide groove 121, so that the mounting block 12 of the brush plate 10 can be disengaged from the brush plate 10 by passing along the buckle guide groove 121. When the buckle 23 in the accommodating seat 22 engages with the buckle engagement groove 123 of the brush disc 10, the brush disc 10 will not be able to detach from the accommodating seat 22, but in the direction along the rotation axis A1, the thickness of the buckle 23 is less than the width of the buckle engagement groove 123, so that the buckle 23 fits loosely in the buckle engagement groove 123, so that the brush disc 10 can still freely reciprocate relative to the accommodating seat 22.

[0058] In a preferred embodiment, if Figure 3 As shown, the buckle 23 on the receiving seat 22 extends from the support 24 in a direction perpendicular to the swing axis A2 and the axis A1. A portion of the follower recess 125 is used as a buckle guide groove 121, and the follower recess 125 is connected to the buckle engagement groove 123. Specifically, in a preferred embodiment, the buckle guide groove 121 includes a portion of the follower recess 125 and a notch 121' radially opposite to the follower recess 125, as shown in FIG. Figure 5 As shown, the recess 121' is recessed from the central hole 126 of the mounting block 12 of the brush plate 10 in the radial direction relative to the rotation axis A1 and is formed in the mounting block 12. When the buckle 23 on the housing 20 is inserted into the buckle guide groove 121 (i.e., the two opposite buckles 23 are respectively inserted into the recess 121' and the follower recess 125) and rotated 90 degrees, the buckle 23 is engaged with the buckle engagement groove 123. At this time, the follower recess 125 and the recess 121' are aligned along the direction of the swing axis A2. At this time, after the swing rod 30 is inserted along the cavity, the swing cam will be able to be inserted into the follower recess 125. When the brush plate 10 rotates with the swing rod 30 in the predetermined rotation angle range, the buckle 23 is always engaged with the buckle engagement groove 123. In particular, the space of the part of the follower recess 125 that serves as the buckle guide groove is occupied by the rocker rod 30, and the buckle 23 cannot be separated from the mounting block 12 along the guide groove 121. Therefore, according to the present invention, the connection between the brush plate 10 and the accommodating seat 22 will be very reliable, avoiding the safety hazard of the brush plate 10 accidentally falling out of the accommodating seat.

[0059] Therefore, in the toothbrush head 1 according to the present invention, a part of the swing rod 23 will always occupy a part of the buckle guide groove 121 during the swing operation, so the swing rod 30 plays a role in locking the engagement of the receiving seat 22 and the brush plate 10. As described above, the swing rod cam 31 of the swing rod 30 is engaged with the follower recess 125 on the mounting block 12 of the brush plate 10, and the buckle 23 will always be in a state of engagement with the buckle engagement groove 123, and the buckle 23 cannot enter the buckle guide groove 121. Therefore, the engagement of the swing rod cam 31 and the follower recess 125 plays a role in limiting the separation of the receiving seat 22 from the brush plate 10.

[0060] like Figure 1 As shown, the lower end of the brush head housing 20 is open, and the swing rod 30 is inserted into the cavity 21 of the brush head housing 20 through the open end 210. In addition, a stop sleeve 50 is also provided at the open end 210 of the brush head housing 20, which is also inserted into the cavity 21 of the brush head housing 20. There is a gap between the stop sleeve 50 and the swing rod 30 to allow the swing rod 30 to swing in the cavity 21, while preventing the swing rod 30 from being separated from the cavity 21, thereby ensuring that the swing rod cam 31 does not disengage from the follower recess 125. A snap-fitting convex piece is provided on the outer surface of the stop sleeve 50, and a snap-fitting hole is provided on the brush head housing 20. After the stop sleeve 50 is inserted into the cavity 21, the snap-fitting convex piece enters the snap-fitting match with the snap-fitting hole, so that the sleeve 50 maintains a fixed position relative to the brush head housing 20. It should be understood that the sleeve 50 can also be fixed to the brush head housing by other fixed connection structures.

[0061] In addition, if Figure 1 As shown, the rocker arm 30 is integrally formed as a cantilever at a position away from the rocker arm cam 31, and a convex portion 33 is provided on the cantilever. A corresponding step portion is formed in the cavity 21 of the brush head housing 20, and the cooperation between the convex portion 33 and the step portion provides auxiliary positioning of the rocker arm 30 relative to the cavity 21.

[0062] The following is a description of the installation method of the toothbrush head 1 according to the present invention. First, align the buckle 23 in the receiving seat 22 on the brush head housing 20 with the buckle guide groove 121 on the mounting block 12 of the brush disc 10, so that the brush disc 10 is inserted into the receiving seat 22 along the direction of the rotation axis A1, and then the brush disc is rotated 90 degrees relative to the receiving cavity so that the buckle 23 enters the buckle engagement groove 123 to achieve a buckle connection. Next, insert the swing rod 30 from the open end 210 of the cavity 21 of the brush head housing 20, so that the end 32 of the swing rod 30 is inserted into the pivot hole 25 in the receiving seat 22, at which time, the swing rod cam 31 is also engaged with the follower recess 125 of the mounting block 12 of the brush disc, and the convex portion 33 on the swing rod cantilever abuts against the step portion in the cavity 21. Finally, insert the stop sleeve 50 from the open end 210 of the cavity 21, abutting against one end of the column swing rod 30, so as to keep the swing rod 30 in the cavity 21. Thus, the installation of the toothbrush head 1 is completed.

[0063] Preferably, the brush plate 10, the brush head housing 20, the swing rod 30, and the stop sleeve 50 are respectively made of plastic, and these components are connected and installed together by being snap-fitted to each other.

[0064] The toothbrush head 1 according to the present invention is connected to the brush plate 10 by the engagement of the buckle 23 with the buckle matching groove 123 so as to be reciprocatingly rotatable. In the toothbrush head 1 of the present invention, the buckle 23 and the buckle matching groove 123 are respectively perpendicular to the rotation axis A1. When the two opposite surfaces of the buckle 23 and the buckle matching groove 123 are in abutment with each other, the buckle 23 is kept in the buckle matching groove 123 and will not fall out. When the buckle 23 rotates to the position where the buckle guide groove 121 is located and the opposite surfaces are no longer in abutment with each other, the buckle 23 can be separated from the buckle matching groove 123, and the brush plate 10 can be separated from the receiving seat 22. When the swing rod 30 in the installed toothbrush head 1 is engaged with the brush plate 10, the swing rod cam 31 occupies the follower recess forming a part of the buckle guide groove, so that the buckle 23 at the receiving seat 22 cannot pass through the buckle guide groove 121. Therefore, the buckle 23 can be reliably connected with the buckle matching groove 123. If the swing rod 30 is not disassembled, the brush plate 10 will not be able to be separated from the brush head housing 20. Therefore, the present invention realizes a simple assembly process and a reliable rotatable connection between the brush disc and the brush head housing at the same time.

[0065] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A toothbrush head for an electric toothbrush, comprising: A brush plate, the brush plate having a brush plate base and a mounting block formed on a lower side of the brush plate base; A brush head housing, wherein the brush head housing forms a cavity, and one end of the brush head housing forms a receiving seat for receiving the mounting block, and the other end of the brush head housing leads to the open end of the cavity, and the brush disc is arranged in the receiving seat to rotate around a rotation axis (A1); as well as a swing rod swingably received in the cavity, the swing rod engaging and driving the brush plate; It is characterized in that The receiving seat is provided with a buckle, and the buckle is arranged on a buckle pillar protruding from the middle of the receiving seat. A buckle guide groove and a buckle engagement groove are formed in the mounting block of the brush disc, the buckle guide groove and the buckle engagement groove are connected, the buckle can be inserted into the buckle guide groove along the rotation axis (A1), and enter the buckle engagement groove after rotation, When the swing rod is engaged with the brush plate, a portion of the swing rod is inserted into the buckle guide groove, preventing the buckle at the accommodating seat from being disengaged from the buckle engagement groove through the guide groove.

2. The toothbrush head according to claim 1, characterized in that The swing lever comprises an integrally formed swing lever cam, the swing lever cam being formed on an outer surface of one end of the swing lever adjacent to the accommodation seat and being offset relative to the swing axis A2 of the swing lever; The mounting block of the brush plate is formed with a follower recess, which is engaged with the rocker cam, and the rocker drives the brush plate to reciprocate around the rotation axis (A1). A part of the swing rod is the swing rod cam, the buckle guide groove includes a part of the follower recess, and the swing rod cam prevents the buckle from escaping through the buckle guide groove.

3. The toothbrush head according to claim 2, characterized in that The receiving seat has an annular outer wall and a bottom wall, and the buckle pillar protrudes from the bottom wall. The pair of buckles extend from opposite sides of the buckle pillar, and the buckle protrusions are spaced apart from the bottom wall of the accommodating seat by a distance.

4. The toothbrush head according to claim 3, characterized in that: The accommodating seat forms a pivot hole below the buckle pillar, the pivot hole extends along a swing line (A2) perpendicular to the rotation axis (A1), and one end of the swing rod is pivotally connected in the pivot hole.

5. The toothbrush head according to claim 3, characterized in that: The mounting block of the brush plate forms a central hole for inserting the clip support, and the clip guide groove includes a portion of the follower recess and a recess radially recessed from the central hole relative to the rotation axis (A1), and the paired clips are respectively guided through a portion of the follower recess and the recess to enter the clip engagement groove.

6. The toothbrush head according to claim 1 or 5, characterized in that: When the rocker cam is engaged with the follower recess, the swing of the rocker around the swing axis (A2) drives the brush plate to rotate around the rotation axis (A1) within a predetermined rotation angle range, and within the predetermined rotation angle range, the buckle is always engaged with the buckle engagement groove.

7. The toothbrush head according to claim 5, characterized in that The rocker cam is formed in the shape of a single conical tooth, and the follower recess of the brush plate is correspondingly formed into a conical tooth groove for receiving the conical tooth. When the rocker cam engages the follower recess, the rocker cam occupies the portion of the follower recess that serves as the buckle guide groove to prevent the buckle from being disengaged through the buckle guide groove.

8. The toothbrush head according to claim 1, characterized in that The outer diameter of the brush disc base is greater than the outer diameter of the brush disc mounting block. Furthermore, at least a portion of the outer surface of the mounting block is rotationally matched with the inner surface of the annular outer wall of the accommodating seat.

9. The toothbrush head according to claim 1, characterized in that: A stop sleeve is also provided in the cavity of the brush head housing, and the stop sleeve is inserted into the open end of the cavity of the brush head housing.

10. The toothbrush head according to claim 1, characterized in that The brush plate, the swing rod and the brush head shell are respectively formed integrally of resin.

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