Multi-size integrated tooth gap brush

Abstract

The invention discloses a multi-size-in-one interdental brush. The multi-size-in-one interdental brush comprises a shell; the interdental brush body assembly comprises a support installed in the shell, a plurality of interdental brush bodies which are installed in the support in a sliding mode and are different in size, and first springs arranged between the interdental brush bodies and the support in a sleeving mode. The pressing engine is installed at the upper end of the shell through a second spring, and the upper end of the pressing engine protrudes out of the upper end of the shell under the elastic force effect of the second spring; the push rod is installed between the opposite pressing and holding part and the tooth slit brush body assembly in a swinging mode, and the lower end of the push rod can swing to the upper end of any tooth slit brush body; when the lower end of the push rod swings to be in contact with the upper end of one interdental brush body, the pressing engine is pressed down to drive the push rod to push the interdental brush body to move downwards, so that the brush head at the lower end of the interdental brush body penetrates through the bracket and extends out of the lower end of the shell; and when the pressing engine is jacked up by the second spring to reset, the tooth slit brush body is jacked up by the first spring to reset, and the push rod also resets.

Description

Technical field:

[0001] The present invention relates to the technical field of daily necessities, in particular to a multi-size interdental brush. Background technology:

[0002] Interdental brushes are similar to ordinary toothbrushes, consisting of a brush head and a handle. The biggest difference lies in the design of the brush head. The interdental brush head is conical in shape and comes in different sizes, suitable for interdental spaces of different widths. You can choose brush heads of different specifications to clean the interdental spaces and tooth surfaces as needed, which can remove debris and dirt in the interdental spaces and is beneficial for teeth cleaning.

[0003] The Chinese utility model patent application number 202322197716.2 discloses a replaceable interdental brush with a core brush body, which includes a handle, a screw cap, a fixed block and a brush body; the handle end has an external thread, the screw cap has an internal thread, and the external thread at the handle end is adapted to the internal thread inside the screw cap; one end of the fixed block abuts the handle, and the other end extends out of the screw cap; the brush body includes a core and bristles, the core is twisted from amorphous alloy wire, one end of the core is clamped in the fixed block, and the other end is connected to the bristles on the side. The above-mentioned interdental brush has a simple structure, is easy to manufacture, and is environmentally friendly, making it suitable for promotion and application. The fixed end of the brush body is fastened to the end of the handle by the fixed block and the screw cap. This design allows the brush body to be replaced if it breaks during use, while the other parts can be recycled.

[0004] The above-mentioned interdental brush can be replaced with brush bodies with cores of different sizes to meet different usage requirements. However, the above-mentioned interdental brush cannot accommodate brush bodies with cores of different sizes at the same time, nor can it be quickly replaced with brush bodies with cores of different sizes, which is extremely inconvenient to use.

[0005] In view of this, the inventors propose the following technical solutions. Summary of the invention:

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a multi-size interdental brush.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: the multi-size interdental brush comprises: a shell; an interdental brush body assembly, which comprises a bracket installed in the shell and a plurality of interdental brush bodies of different sizes slidably installed in the bracket, and a first spring sleeved between the interdental brush body and the bracket; a push-up lever, which is installed at the upper end of the shell by a second spring, and the upper end of the push-up lever protrudes out of the upper end of the shell under the elastic force of the second spring; a push rod, which is installed between the push-up lever and the interdental brush body assembly in a swingable manner, and the lower end of the push rod can swing to the upper end of any one of the interdental brush bodies; when the lower end of the push rod swings to contact the upper end of one of the interdental brush bodies, and the push-up lever is pressed down to drive the push rod to push the interdental brush body downward, so that the brush head at the lower end of the interdental brush body passes through the bracket and extends out of the lower end of the shell; when the push-up lever is lifted and reset by the second spring, the interdental brush body is lifted and reset by the first spring, and the push rod is also reset accordingly.

[0008] Furthermore, in the above technical solution, an end cover is provided at the lower end of the shell, which covers the outlet provided at the lower end of the shell for the brush head to extend out, and the end cover can be pulled out relative to the lower end of the shell and then snapped on and fixed to the upper end of the shell, and the rod body inside the end cover drives the press down, wherein the length of the rod body is greater than or equal to the stroke size of the brush head moving downward and extending out of the lower end of the shell.

[0009] Furthermore, in the above technical solution, a first magnetic component is provided in the end cover, a second magnetic component is provided at the lower end of the shell, and a third magnetic component is provided at the upper end of the shell; when the end cover is sleeved on the lower end of the shell, the first magnetic component and the second magnetic component are magnetically fixed; when the end cover is sleeved on the upper end of the shell, the first magnetic component and the third magnetic component are magnetically fixed.

[0010] Furthermore, in the above technical solution, the end cover includes a cover body, a first magnetic member embedded and fixed inside the cover body, and a cover tube sleeved and fixed outside the upper end of the cover body, and the cover body is also formed with a protruding rod body.

[0011] Furthermore, in the above technical solution, the lower end of the push button is provided with a spherical concave surface; the upper end of the push rod is provided with a spherical head, which is placed in the spherical concave surface and serves as a fulcrum for the swing of the lower end of the push rod.

[0012] Furthermore, in the above technical solution, a plurality of vertically spaced sliding holes are provided on the periphery of the upper end of the bracket, and a separation groove corresponding to the sliding holes is provided on the periphery of the lower end of the bracket; the interdental brush body is passed through the sliding hole, and the brush head at the lower end of the interdental brush body is placed in the separation groove, and the first spring is placed in the sliding hole, and a limiting ring is provided on the upper end of the bracket, which covers a part of the opening at the upper end of the sliding hole to prevent the interdental brush body from popping out of the upper end of the bracket under the elastic force of the first spring, and the lower end of the push rod is placed in the limiting ring and can be extended into the sliding hole to drive the interdental brush body to slide downward in the sliding hole.

[0013] Furthermore, in the above technical solution, the interdental brush body includes: a sliding rod, a deformable brush rod arranged at the lower end of the sliding rod, and a brush head arranged at the lower end of the brush rod, the upper end of the sliding rod is provided with a sliding portion protruding outward, the sliding portion is arranged in the sliding hole and at least partially contacts the inner wall of the sliding hole, the first spring is sleeved on the outer periphery of the sliding rod, and the upper end of the first spring contacts the lower end surface of the sliding portion, and the lower end of the first spring contacts the bracket.

[0014] Furthermore, in the above technical solution, a plurality of positioning holes are provided at the upper end of the bracket; a plurality of positioning columns are provided at the lower end of the limiting ring, and the positioning columns are embedded and fixed in the positioning holes to fix the limiting ring to the upper end of the bracket; a step is provided at the lower end of the sliding hole, and the step is provided with a guide hole connected to the sliding hole and with an inner diameter smaller than the sliding hole, the first spring is in contact with the step, and the sliding rod is passed through the guide hole.

[0015] Furthermore, in the above technical solution, the outside of the limiting ring is further provided with a plurality of circumferentially distributed limiting ribs, which are tensioned and positioned with the inner wall of the shell; the outside of the push rod is also provided with a ring body for counterweight.

[0016] Furthermore, in the above technical solution, the shell includes a main shell, an upper shell embedded and fixed on the upper end of the main shell, a cover ring provided on the upper end of the upper shell and serving as a third magnetic member, and a lower shell spirally installed on the lower end of the main shell, and the lower end of the lower shell has a bucket-shaped outlet; the lower end of the push-button, the second spring and the push rod are all arranged in the upper shell, and the interdental brush body assembly is arranged in the main shell, and the lower end of the bracket and the brush head at the lower end of the interdental brush body are extended into the lower shell; the inner wall of the upper shell is provided with a plurality of guide grooves, and the outer periphery of the lower end of the push-button is provided with a plurality of sliders, the upper end of the push-button passes through the upper shell and the cover ring and extends outside the upper end surface of the cover body, and the slider is installed in cooperation with the guide groove, and the slider can slide axially relative to the guide groove; a limited space for limiting the second spring is formed between the sliders.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: the present invention can simultaneously accommodate / store multiple interdental brush bodies of different sizes without exposing them to the outside, thereby ensuring the cleanliness of the interdental brush bodies, making them cleaner and more hygienic to use and extremely convenient to carry; in addition, the present invention can tilt the outer shell in different directions so that the lower end of the push rod can be swung to the upper end of interdental brush bodies of different sizes, and then the brush heads at the lower ends of interdental brush bodies of different sizes can be extended out of the outer shell to meet different usage requirements. Description of the drawings:

[0018] Figure 1 It is a perspective view of the present invention;

[0019] Figure 2 It is a three-dimensional diagram from another perspective of the present invention;

[0020] Figure 3 is a cross-sectional view of the present invention (initial state);

[0021] Figure 4 It is a cross-sectional view of the present invention (in use);

[0022] Figure 5 It is an exploded perspective view of the present invention;

[0023] Figure 6 It is a diagram of the use process of the present invention;

[0024] Figure 7 It is a usage state diagram of the present invention;

[0025] Figure 8 It is an exploded view of the present invention in use. Specific implementation method:

[0026] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0027] See Figure 1-8 As shown, a multi-size interdental brush is provided, which includes: a shell 1, an interdental brush body component 200, a button 5 and a push rod 6.

[0028] Among them, the interdental brush body assembly 200 includes a bracket 2 installed in the shell 1 and a plurality of interdental brush bodies 3 of different sizes slidably installed in the bracket 2, and a first spring 4 arranged between the interdental brush body 3 and the bracket 2; a button 5 is installed on the upper end of the shell 1 through a second spring 51, and the upper end of the button 5 protrudes out of the upper end of the shell 1 under the elastic force of the second spring 51; the push rod 6 is installed between the button 5 and the interdental brush body assembly 200 in a swingable manner, and the lower end of the push rod 6 can swing to the upper end of any interdental brush body 3; when the lower end of the push rod 6 swings to contact the upper end of one interdental brush body 3, and the button 5 is pressed down to drive the push rod 6 to push the interdental brush body 3 downward, so that the brush head 31 at the lower end of the interdental brush body 3 passes through the bracket 2 and extends out of the lower end of the shell 1; when the button 5 is pushed up and reset by the second spring 51, the interdental brush body 3 is pushed up and reset by the first spring 4, and the push rod 6 is also reset accordingly. That is to say, in the normal state (i.e., the initial state), the upper end of the push-button 5 protrudes out of the upper end of the shell 1 under the elastic force of the second spring 51. At the same time, each interdental brush body 3 is pushed upward by the elastic force of the first spring 4 set on its periphery. At this time, the push rod 6 is placed between the push-button 5 and the interdental brush body assembly 200, and the lower end of the push rod 6 can be swung to the upper end of any interdental brush body 3; when the interdental brush needs to be used, the shell 1 is tilted so that the lower end of the push rod 6 can be swung to a tooth gap. At the upper end of the brush body 3, the button 5 is pressed down, and the button 5 drives the push rod 6 to push the interdental brush body 3 downward, so that the brush head 31 at the lower end of the interdental brush body 3 passes through the bracket 2 and extends out of the lower end of the shell 1, so that the brush head 31 can be used to clean the gaps between teeth. In this way, the shell 1 can be tilted in different directions, so that the lower end of the push rod 6 can be swung to the upper end of the interdental brush body 3 of different sizes, and then the brush heads 31 at the lower end of the interdental brush body 3 of different sizes can be extended out of the shell 1 to meet different usage requirements.

[0029] In order to make it more convenient to use, the following design is also made: an end cover 7 is provided at the lower end of the shell 1, and the end cover 7 covers the outlet 101 provided at the lower end of the shell 1 for the brush head 31 to extend out, and the end cover 7 can be pulled out relative to the lower end of the shell 1 and then fixed to the upper end of the shell 1, and the rod body 71 in the end cover 7 drives the press 5 to be pressed down, wherein the length of the rod body 71 is greater than or equal to the stroke size of the brush head 31 moving downward and extending out of the lower end of the shell 1, that is, after the end cover 7 is fixed to the upper end of the shell 1, the end cover 7 can drive the press 5 to be pressed down, thereby passing the brush head 31 at the lower end of the interdental brush body 3 through the bracket 2 and extending out of the lower end of the shell 1, which is more convenient to use. The end cap 7 is fixed to the upper end of the housing 1 and can overcome the elastic force of the first and second springs, thereby ensuring that the brush head 31 at the lower end of the interdental brush body 3 is always extended outside the lower end of the housing 1, making it more convenient to use. When not in use, the end cap 7 is pulled out from the upper end of the housing 1. At this time, the push button 5 is reset under the elastic force of the second spring, and the interdental brush body 3 and the push rod 6 are reset under the elastic force of the first spring. The end cap 7 is then re-installed on the lower end of the housing 1. The end cap 7 covers the outlet 101 provided at the lower end of the housing 1 for the brush head 31 to extend, thereby preventing foreign matter from entering. This ensures that the present invention is cleaner, more sanitary, and more convenient to use. After the end cap 7 is installed on the upper or lower end of the housing 1, it is tightened by tension to form a fixed assembly.

[0030] In order to make the assembly of the end cover 7 and the upper or lower end of the shell 1 more stable, the following design is also made: a first magnetic part 72 is provided in the end cover 7, a second magnetic part 11 is provided at the lower end of the shell 1, and a third magnetic part 12 is provided at the upper end of the shell 1; when the end cover 7 is sleeved on the lower end of the shell 1, the first magnetic part 72 is magnetically fixed to the second magnetic part 11; when the end cover 7 is sleeved on the upper end of the shell 1, the first magnetic part 72 is magnetically fixed to the third magnetic part 12, thereby ensuring that the assembly of the end cover 7 and the upper or lower end of the shell 1 is more stable. In particular, after the end cover 7 is fixedly assembled with the upper end of the shell 1, it can be ensured that the end cover 7 and the upper end of the shell 1 will not be accidentally detached, thereby ensuring that the rod body 71 of the end cover 7 can ensure that the button 5 is always in a pressed state, so that the brush head 31 at the lower end of the interdental brush body 3 always extends out of the lower end of the shell 1, thereby improving the convenience of use.

[0031] Among them, in this embodiment, the first magnetic component 72 is a strong magnet, and the first magnetic component 72 and the third magnetic component 12 are both made of stainless iron, so that when the first magnetic component 72 contacts the first magnetic component 72 or the third magnetic component 12, a stable adsorption and fixing function can be achieved between them.

[0032] The end cover 7 includes a cover body 73, a first magnetic component 72 embedded and fixed inside the cover body 73, and a cover tube 74 fixed on the outside of the upper end of the cover body 73. The cover body 73 is also formed with the protruding rod body 71, which separates the cover body 73 from the cover tube 74 in order to better form the rod body 71 on the cover body 73, improve workability and reduce production difficulty.

[0033] In this embodiment, a spherical concave surface 52 is provided at the lower end of the button 5; a spherical head 61 is provided at the upper end of the push rod 6, and the spherical head 61 is placed in the spherical concave surface 52 and serves as a fulcrum for the swing of the lower end of the push rod 6. The spherical head 61 can swing smoothly in the spherical concave surface 52 and serve as a fulcrum for the swing of the lower end of the push rod 6, so that the swing of the lower end of the push rod 6 is also smoother. At the same time, this design can also prevent the upper end of the push rod 6 from detaching from the lower end of the button 5, so that after pressing the button 5, the push rod 6 can be smoothly driven to move downward.

[0034] Among them, the outside of the push rod 6 is also provided with a ring body 60 for counterweight. When the shell 1 is tilted, the ring body 60 will tilt accordingly, and the ring body 60 will fall on the lower end of the push rod 6. Under the action of the gravity of the ring body 60, the lower end of the push rod 6 is better driven to swing, and then the lower end of the push rod 6 can be smoothly swung to the upper end of one of the interdental brush bodies 3 and form contact, so that the push rod 6 can more smoothly drive the interdental brush body 3 to move downward in the later stage.

[0035] In this embodiment, the upper end of the bracket 2 is provided with a plurality of vertically spaced sliding holes 21, and the lower end of the bracket 2 is provided with a separation groove 22 corresponding to each of the sliding holes 21. The interdental brush body 3 is inserted into the sliding hole 21, and the brush head 31 at the lower end of the interdental brush body 3 is placed in the separation groove 22. The first spring 4 is placed in the sliding hole 21. The lower end of the sliding hole 21 is provided with a step 211. The step 211 is provided with a guide hole 212 that is connected to the sliding hole 21 and has an inner diameter smaller than that of the sliding hole 21. The first spring 4 contacts the step 211, making the first spring 4 more stably installed between the interdental brush body 3 and the bracket 2, thereby providing a more stable elastic force for the interdental brush body 3. The slide rod 32 is inserted into the guide hole 212, enabling it to slide more smoothly.

[0036] In addition, a limiting ring 23 is provided at the upper end of the bracket 2, which covers a part of the opening at the upper end of the sliding hole 21 to prevent the interdental brush body 3 from popping out of the upper end of the bracket 2 under the elastic force of the first spring 4, and the lower end of the push rod 6 is placed in the limiting ring 23 and can be extended into the sliding hole 21 to drive the interdental brush body 3 to slide downward in the sliding hole 21, thereby ensuring the quality of the present invention.

[0037] The interdental brush body 3 includes: a slide rod 32, a deformable brush rod 33 arranged at the lower end of the slide rod 32, and a brush head 31 arranged at the lower end of the brush rod 33. The upper end of the slide rod 32 is provided with a sliding portion 321 protruding outward, and the sliding portion 321 is arranged in the sliding hole 21 and at least partially contacts the inner wall of the sliding hole 21. The first spring 4 is sleeved on the outer periphery of the slide rod 32, and the upper end of the first spring 4 contacts the lower end surface of the sliding portion 321. The lower end of the first spring 4 contacts the bracket 2, so that the first spring 4 is more stably installed between the slide rod 32 and the bracket 2, thereby improving the stable elastic force of the interdental brush body 3.

[0038] The brush rod 33 is deformable, so that after the interdental brush body 3 is pressed down, the brush rod 33 is deformed so that the brush head 31 can smoothly pass through the outlet 101 and extend out of the lower end surface of the shell 1.

[0039] The upper end of the bracket 2 is provided with several positioning holes 25; the lower end of the limiting ring 23 is provided with multiple positioning columns 231, which are embedded and fixed with the positioning holes 25 to fix the limiting ring 23 to the upper end of the bracket 2. Its assembly structure is simple and easy to install.

[0040] The upper end of the limiting ring 23 is provided with a first spring groove, and the lower end of the second spring is embedded in the first spring groove.

[0041] The outer portion of the limiting ring 23 is further provided with a plurality of circumferentially distributed limiting ribs 232 , which are tensioned and positioned with the inner wall of the housing 1 , thereby making the assembly of the bracket 2 and the housing 1 more stable.

[0042] The shell 1 includes a main shell 13, an upper shell 14 embedded and fixed on the upper end of the main shell 13, a cover ring provided on the upper end of the upper shell 14 and serving as the third magnetic member 12, and a lower shell 15 screwed on the lower end of the main shell 13, and the lower end of the lower shell 15 has a bucket-shaped outlet 101; the lower end of the button 5, the second spring 51 and the push rod 6 are all arranged in the upper shell 14, the interdental brush body assembly 200 is arranged in the main shell 13, and the lower end of the bracket 2 and the brush head 31 at the lower end of the interdental brush body 3 are both extended into the lower shell 15; the cover ring is made of stainless iron and has a decorative effect.

[0043] The inner wall of the upper shell 14 is provided with a plurality of guide grooves 141, and the outer periphery of the lower end of the button 5 is provided with a plurality of sliders 53. The upper end of the button 5 passes through the upper shell 14 and the cover body 73 and extends out of the upper end surface of the cover ring, and the slider 53 is installed in cooperation with the guide groove 141. The slider 53 can slide axially relative to the guide groove 141, so that the assembly of the button 5 and the shell 1 is more stable, and the axial sliding of the button 5 is smoother, which can improve the product quality of the present invention; a limited space for limiting the second spring 51 is formed between the sliders 53, which ensures that the second spring 51 will not run around, thereby improving the stability of the assembly structure of the second spring 51.

[0044] To sum up, the present invention can simultaneously accommodate / store multiple interdental brush bodies 3 of different sizes without exposing them to the outside, thereby ensuring the cleanliness of the interdental brush bodies 3, making them cleaner and more hygienic to use and extremely convenient to carry; in addition, the present invention can tilt the outer shell 1 in different directions so that the lower end of the push rod 6 can be swung to the upper end of the interdental brush bodies 3 of different sizes, and then the brush heads 31 at the lower ends of the interdental brush bodies 3 of different sizes can be extended out of the outer shell 1 to meet different usage requirements.

[0045] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A multi-size interdental brush, characterized by: It includes: Housing (1); An interdental brush body assembly (200) comprises a bracket (2) mounted in a housing (1), a plurality of interdental brush bodies (3) of different sizes slidably mounted in the bracket (2), and a first spring (4) sleeved between the interdental brush body (3) and the bracket (2); A push-button (5) is mounted on the upper end of the housing (1) via a second spring (51), and the upper end of the push-button (5) protrudes out of the upper end of the housing (1) under the elastic force of the second spring (51); A push rod (6) is mounted between the push button (5) and the interdental brush body assembly (200) in a swingable manner, and the lower end of the push rod (6) can swing to the upper end of any interdental brush body (3); When the lower end of the push rod (6) swings to contact the upper end of an interdental brush body (3), and the push button (5) is pressed down to drive the push rod (6) to push the interdental brush body (3) downward, so that the brush head (31) at the lower end of the interdental brush body (3) passes through the bracket (2) and extends out of the lower end of the shell (1); when the push button (5) is lifted and reset by the second spring (51), the interdental brush body (3) is lifted and reset by the first spring (4), and the push rod (6) is also reset accordingly.

2. The multi-size interdental brush according to claim 1, characterized in that: The lower end of the housing (1) is sleeved with an end cover (7), which covers an outlet (101) provided at the lower end of the housing (1) for the brush head (31) to extend out, and the end cover (7) can be pulled out relative to the lower end of the housing (1) and then snapped onto the upper end of the housing (1), and a rod (71) in the end cover (7) drives the press (5) to press down, wherein the length of the rod (71) is greater than or equal to the length of the stroke of the brush head (31) moving downward and extending out of the lower end of the housing (1).

3. The multi-size interdental brush according to claim 2, characterized in that: A first magnetic member (72) is provided in the end cover (7), a second magnetic member (11) is provided at the lower end of the shell (1), and a third magnetic member (12) is provided at the upper end of the shell (1); when the end cover (7) is sleeved on the lower end of the shell (1), the first magnetic member (72) and the second magnetic member (11) are magnetically fixed; when the end cover (7) is sleeved on the upper end of the shell (1), the first magnetic member (72) and the third magnetic member (12) are magnetically fixed.

4. The multi-size interdental brush according to claim 3, characterized in that: The end cover (7) comprises a cover body (73), a first magnetic attraction member (72) embedded and fixed inside the cover body (73), and a cover cylinder (74) sleeved and fixed outside the upper end of the cover body (73); the cover body (73) is also formed with a protruding rod body (71).

5. The multi-size interdental brush according to any one of claims 1 to 4, characterized in that: The lower end of the push rod (5) is provided with a spherical concave surface (52); the upper end of the push rod (6) is provided with a spherical head (61), which is placed in the spherical concave surface (52) and serves as a fulcrum for the swing of the lower end of the push rod (6).

6. The multi-size interdental brush according to claim 5, characterized in that: The upper end of the bracket (2) is provided with a plurality of vertically spaced sliding holes (21), and the lower end of the bracket (2) is provided with separation grooves (22) corresponding to the sliding holes (21) respectively; the interdental brush body (3) is passed through the sliding hole (21), and the brush head (31) at the lower end of the interdental brush body (3) is placed in the separation groove (22), and the first spring (4) is placed in the sliding hole (21), and a limiting ring (23) is provided at the upper end of the bracket (2), and the limiting ring (23) covers a part of the upper end opening of the sliding hole (21) to prevent the interdental brush body (3) from popping out of the upper end of the bracket (2) under the elastic force of the first spring (4), and the lower end of the push rod (6) is placed in the limiting ring (23) and can be extended into the sliding hole (21) to drive the interdental brush body (3) to slide downward in the sliding hole (21).

7. The multi-size interdental brush according to claim 6, characterized in that: The interdental brush body (3) comprises: a slide rod (32), a deformable brush rod (33) arranged at the lower end of the slide rod (32), and a brush head (31) arranged at the lower end of the brush rod (33); the upper end of the slide rod (32) is provided with a sliding portion (321) protruding outward, the sliding portion (321) is arranged in the slide hole (21) and at least partially contacts the inner wall of the slide hole (21); the first spring (4) is sleeved on the outer periphery of the slide rod (32), and the upper end of the first spring (4) contacts the lower end surface of the sliding portion (321), and the lower end of the first spring (4) contacts the bracket (2).

8. The multi-size interdental brush according to claim 6, characterized in that: The upper end of the bracket (2) is provided with a plurality of positioning holes (25); the lower end of the limiting ring (23) is provided with a plurality of positioning columns (231), the positioning columns (231) are embedded and fixed with the positioning holes (25), so that the limiting ring (23) is fixed to the upper end of the bracket (2); the lower end of the sliding hole (21) is provided with a step (211), the step (211) is provided with a guide hole (212) which is connected to the sliding hole (21) and has an inner diameter smaller than that of the sliding hole (21), the first spring (4) is in contact with the step (211), and the sliding rod (32) is passed through the guide hole (212).

9. The multi-size interdental brush according to claim 8, characterized in that: The outer portion of the limiting ring (23) is further provided with a plurality of circumferentially distributed limiting ribs (232), which are tensioned and positioned with the inner wall of the housing (1); the outer portion of the push rod (6) is further provided with a ring body (60) for counterweight.

10. The multi-size interdental brush according to claim 5, characterized in that: The housing (1) comprises a main housing (13), an upper housing (14) embedded and fixed on the upper end of the main housing (13), a cover ring provided on the upper end of the upper housing (14) and serving as a third magnetic attraction member (12), and a lower housing (15) screwed on the lower end of the main housing (13), wherein the lower end of the lower housing (15) has a bucket-shaped outlet (101); the lower end of the push-button (5), the second spring (51) and the push rod (6) are all provided in the upper housing (14), the interdental brush body assembly (200) is provided in the main housing (13), and the lower end of the bracket (2) and the brush head (31) at the lower end of the interdental brush body (3) are both extended into the lower housing (15); The inner wall of the upper shell (14) is provided with a plurality of guide grooves (141), and the outer periphery of the lower end of the push-button (5) is provided with a plurality of sliders (53). The upper end of the push-button (5) passes through the upper shell (14) and the cover ring and extends out of the upper end surface of the cover body (73), and the slider (53) is installed in conjunction with the guide groove (141). The slider (53) can slide axially relative to the guide groove (141); a limited space for limiting the second spring (51) is formed between the sliders (53).

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