Toothbrush with sealed inner cavity

Abstract

The utility model relates to a toothbrush with a sealed inner cavity, which comprises a brush handle, the brush handle comprises a main body part, an inner cavity, an air inlet, an air inlet pipe and a sealing element, the air inlet pipe is arranged on the outer surface of the main body part, the air inlet is arranged on the air inlet pipe, the air inlet is used for communicating the inner cavity with air, and the sealing element is arranged in the inner cavity. The sealing piece is formed by hot melting of the air inlet pipe and used for sealing the air inlet. According to the toothbrush with the sealed inner cavity, the air inlet is sealed in a hot melting mode, so that water accumulation and bacteria generation in the inner cavity are avoided, and the sanitary condition of the toothbrush is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of toothbrush manufacturing, in particular to a toothbrush with a sealed inner cavity. Background Art

[0002] Toothbrushes are daily cleaning tools that are closely related to everyone's life. Toothbrushes are used frequently, and they are constantly worn during use, so the frequency of replacement of toothbrushes is also very high. Toothbrushes on the market are generally made of plastic. If the replaced toothbrushes are not properly handled, they will cause serious environmental pollution. At the same time, a large amount of plastic being discarded will also cause material waste. In the prior art, a cavity is generally formed at the brush handle to reduce the use and waste of materials.

[0003] However, because the toothbrush will come into contact with water during use, water will accumulate in the cavity of the brush handle, which will then produce bacteria. Because the toothbrush needs to enter the mouth for cleaning, the hygiene conditions of the toothbrush itself are very strict. Long-term use of such a toothbrush with bacteria will inevitably have a serious negative impact on human health.

[0004] Therefore, how to design a toothbrush that can seal the inner cavity of the brush handle is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present utility model is to provide a toothbrush with a sealed inner cavity, so as to avoid bacteria generated by water accumulation in the inner cavity and improve the sanitary condition of the toothbrush.

[0006] The utility model provides a toothbrush with a sealed inner cavity, characterized in that it comprises: a brush handle, the brush handle comprising a main body, an inner cavity, an air inlet, an air inlet pipe and a sealing member, the air inlet pipe is arranged on the outer surface of the main body, the air inlet is opened on the air inlet pipe, the air inlet is used to connect the inner cavity with air, the sealing member is formed by hot melting the air inlet pipe, and the sealing member is used to seal the air inlet.

[0007] In one embodiment, the air inlet pipe protrudes from the outer surface of the main body.

[0008] In one embodiment, the air inlet pipe is cylindrical.

[0009] In one embodiment, the height of the air inlet pipe is greater than the radius of the air inlet pipe.

[0010] In one embodiment, the air inlet pipe is perpendicular to the length direction of the main body.

[0011] In one embodiment, the toothbrush with a sealed inner cavity further includes a two-color plastic injection molding overmolding, the two-color plastic injection molding overmolding is wrapped around the outer surface of the main body, and the two-color plastic injection molding overmolding covers the air inlet.

[0012] In one embodiment, the two-color plastic injection molding wraps the main body.

[0013] In one embodiment, the hardness of the two-color plastic injection molding is less than or equal to the hardness of the main body.

[0014] In one embodiment, the toothbrush with a sealed inner cavity further comprises a brush head, and the brush head is fixedly connected to the brush handle.

[0015] In one embodiment, the wall thickness of the main body is uniform.

[0016] In the toothbrush with a sealed inner cavity provided by the embodiment of the utility model, the air inlet is sealed by hot melting, thereby avoiding bacteria generated by water accumulation in the inner cavity and improving the hygiene of the toothbrush. At the same time, the hot melting method is used for sealing, and no additional parts are needed to block the air inlet, making the overall structure simpler and saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a cross-sectional view of a toothbrush with a sealed inner cavity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0022] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0023] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0024] Please refer to Figure 1 , which shows a toothbrush with a sealed inner cavity provided in an embodiment of the utility model, comprising: a brush handle 1, the brush handle 1 comprising a main body 11, an inner cavity 12, an air inlet 13, an air inlet pipe 14 and a sealing member 15, the air inlet pipe 14 is arranged on the outer surface of the main body 11, the air inlet 13 is opened on the air inlet pipe 14, the air inlet 13 is used to connect the inner cavity 12 with the air, the sealing member 15 is formed by hot melting the air inlet pipe 14, and the sealing member 15 is used to seal the air inlet 13.

[0025] In this embodiment, the toothbrush with a sealed inner cavity is made by injection molding. First, a certain amount of plasticized plastic is filled into the mold cavity of the injection mold, and the specific amount of plasticized plastic added needs to be obtained through experiments. Different models of toothbrushes may also require different amounts, which need to be determined based on actual conditions. The shape of the brush handle 1 is determined by the mold cavity of the injection mold. Preferably, the brush handle 1 is cylindrical for easy gripping.

[0026] During the process of injecting the plasticized plastic, or after the injection of the plasticized plastic is completed. Gas is injected into the plasticized plastic from the air inlet 13 on the air inlet pipe 14. And the pressure of the injected gas is greater than the injection pressure, so that an inner cavity 12 can be formed in the plasticized plastic. When the cooling cycle is completed, the molded brush handle 1 can be ejected from the mold. Finally, it is only necessary to use a hot melt heater to melt the air inlet pipe 14 to form a seal 15, and the air inlet 13 is sealed by the seal 15, so as to protect the inner cavity 12 from entering pollutants and foreign substances such as bacteria.

[0027] In this embodiment, the air inlet pipe 14 is melted by a hot melt heater to complete the sealing, so that the inner cavity 12, which was originally only connected to the outside atmosphere through the air inlet 13, becomes a closed cavity, and external pollutants and bacteria cannot enter the inner cavity 12 through the air inlet 13, thereby improving the sanitary conditions of the brush handle 1. In addition, in this embodiment, no additional components are needed to block the air inlet 13, making the brush handle 1 simpler in structure and saving materials.

[0028] In this embodiment, injection molding is performed first, and then gas is injected into the plasticized plastic in the injection mold cavity. This allows the brush handle 1 to have the advantage of high injection molding precision, and can also reduce the generation of flash and burrs, thereby improving the overall production yield. At the same time, the inner cavity 12 can be generated by injecting gas, saving materials.

[0029] In one embodiment, the air inlet pipe 14 protrudes from the outer surface of the main body 11. In one embodiment, the air inlet pipe 14 is cylindrical. In one embodiment, the height of the air inlet pipe 14 is greater than the radius of the air inlet pipe 14. In one embodiment, the air inlet pipe 14 is perpendicular to the length direction of the main body 11.

[0030] like Figure 1 As shown, during the injection molding process, an air inlet pipe 14 is formed on the outer surface of the main body 11 by the shape of the mold cavity. The air inlet 13 on the air inlet pipe 14 is connected to the inner cavity 12, and gas can be injected from the air inlet 13 to form the inner cavity 12, and the size of the inner cavity 12 is related to the volume of the injected gas. When gas is injected into the plasticized plastic from the air inlet 13, the plasticized plastic is pressed against the mold cavity by the strong gas pressure inside the plasticized plastic. The mold cavity is fixed and the gas pressure is propagated in all directions, so the plasticized plastic can be made to fit the inner wall of the mold cavity by the strong gas pressure.

[0031] And the injected gas needs to be retained in the inner cavity 12 until the plasticized plastic is cooled and formed. This period of time is called the pressure holding period. The gas pressure in the inner cavity 12 ensures that the plasticized plastic can continue to fit the inner wall of the mold cavity without shrinking. For this reason, it is necessary to ensure that the pressure of the injected gas is greater than the injection pressure so that there is a sufficiently large gas pressure so that the plasticized plastic can continue to fit the inner wall of the mold cavity. Through the cooperation of the mold cavity and the gas pressure, the plasticized plastic forms an outwardly protruding air inlet pipe 14.

[0032] In this embodiment, the outwardly protruding air inlet pipe 14 can prevent the main body 11 from being sunken inward. In addition, the protruding air inlet pipe 14 can be directly melted by the hot melt heater without the need for the hot melt heater to penetrate into the inner cavity 12 to melt the air inlet pipe 14, thereby improving the working efficiency of the hot melt heater.

[0033] In this embodiment, the air inlet pipe 14 is preferably cylindrical, which can improve the structural strength of the air inlet pipe 14. At the same time, when the cylindrical air inlet pipe 14 is subjected to pressure, the pressure distribution can be more uniform without the problem of local stress concentration. The air inlet pipe 14 is perpendicular to the length direction of the main body 11, which is convenient for the injection of gas and the circulation of the injected gas.

[0034] In one embodiment, the toothbrush with a sealed inner cavity further includes a two-color plastic injection molding coating 2 , which is wrapped around the outer surface of the main body 11 and covers the air inlet 13 .

[0035] Please refer to Figure 1 The outer surface of the main body 11 is also wrapped with a two-color plastic injection molding 2. Because the air inlet 13 is sealed by hot-melting to form a seal 15, the seal 15 formed after hot-melting will have an irregular shape and the overall surface is not smooth enough, which will greatly affect the aesthetics of the brush handle 1. At the same time, the air inlet pipe 14 also protrudes outward along the outer surface of the main body 11, which is not coordinated with the overall main body 11, affecting the grip feeling.

[0036] Therefore, in this embodiment, after the formed brush handle 1 is ejected from the mold cavity, the brush handle 1 is further processed and hot-melted to form a seal 15. A two-color plastic injection molding overmolding 2 is added to the outer surface of the brush handle 1, and the two-color plastic injection molding overmolding 2 needs to completely cover the seal 15. This process can also be achieved through a two-color mold. After the brush handle 1 is injection molded, the mold is opened, and then it is switched and rotated to the two-color injection molding station (cavity). After the hot-melt forming of the seal 15 is completed, the two-color plastic injection molding overmolding 2 is completed. The two-color plastic injection molding overmolding 2 can not only cover the irregular shape of the sealing port caused by hot melting, but also add a layer of sealing to the air inlet 13. In this embodiment, the aesthetics of the brush handle 1 is improved by adding the two-color plastic injection molding overmolding 2, and the sealing of the air inlet 13 is also improved.

[0037] In one embodiment, the two-color plastic injection molding overmolding 2 wraps the main body 11. In one embodiment, the hardness of the two-color plastic injection molding overmolding 2 is less than or equal to the hardness of the main body 11.

[0038] Please refer to Figure 1 The outer surface of the main body 11 is wrapped by the two-color plastic injection molding 2. The two-color plastic injection molding 2 needs to fully or partially wrap the main body 11 according to the appearance design requirements, but no matter which form is used, the seal 15 needs to be completely covered. Figure 1 As shown, a fully wrapped form is selected in this embodiment. Preferably, the two-color plastic injection molding rubber coating 2 is a soft material. The main body 11 is formed by plasticized plastic injection molding, so the hardness of the main body 11 is relatively high. Because the main body 11 needs to have sufficient hardness to ensure that the toothbrush will not bend or deform during use, thereby ensuring the cleaning efficiency of the toothbrush. During the use of the toothbrush, the handle 1 needs to be held. The main body 11 with a relatively high hardness will generate greater pressure on the gripping part of the holder during the gripping process, thereby causing pain.

[0039] Therefore, in this embodiment, the brush is wrapped by a two-color plastic injection molding overmolding 2. And the two-color plastic injection molding overmolding 2 uses a soft material, so that the hardness of the two-color plastic injection molding overmolding 2 is less than the hardness of the main body 11. Then in the process of holding the brush handle 1, the gripping part of the holder contacts the two-color plastic injection molding overmolding 2 with a relatively low hardness. The two-color plastic injection molding overmolding 2 uses a soft material with a relatively low hardness. When subjected to gripping pressure, it can better fit the shape of the gripping part, thereby increasing the contact area, dispersing the pressure, and reducing the local pressure. At the same time, the soft material used by the two-color plastic injection molding overmolding 2 has a good buffering effect, can absorb and disperse external forces, and reduce the impact and pressure on the gripping part.

[0040] The two-color plastic injection molding 2 fully wraps the main body 11, which can increase the layout range of the soft material. Because different holders have different holding habits, the positions of holding the main body 11 are also different. Along the length direction of the main body 11, some holders are used to holding the middle of the main body 11, and some holders are used to holding the ends of the main body 11. Therefore, the full wrapping of the two-color plastic injection molding 2 can adapt to the holding habits of different holders, increase the holding range of the main body 11, and improve the comfort of holding.

[0041] In addition, when the brush handle 1 is held or placed normally, there is a risk of falling. If it falls from a high place, the brush handle 1 will be damaged, affecting the service life of the brush handle 1. In this embodiment, the brush handle 1 is wrapped with a two-color plastic injection molding 2, so that after the brush handle 1 falls, it is the two-color plastic injection molding 2 that impacts and contacts the ground. The material used for the two-color plastic injection molding 2 is soft material, which has a good buffering effect, reduces the risk of damage, and thus increases the service life of the brush handle 1.

[0042] In one embodiment, the toothbrush with a sealed inner cavity further comprises a brush head 3, and the brush head 3 is fixedly connected to the brush handle 1. In one embodiment, the wall thickness of the main body 11 is uniform.

[0043] like Figure 1 As shown, a brush head 3 is fixedly connected to the end of the brush handle 1, and the brush head 3 is used to install bristles. After the bristles are installed on the brush head 3, the bristles can be controlled by holding the brush handle 1 to clean the oral cavity. As can be seen from the above, during the pressure maintenance period, the gas pressure in the inner cavity 12 is used to ensure that the pressure on various parts of the main body 11 is relatively balanced, so that the wall thickness of the main body 11 is uniform. Therefore, the uniformity of the wall thickness depends on the gas filling conditions, and a good gas condition is ensured to achieve a uniform wall thickness. Uniform wall thickness can avoid the occurrence of breakage and other phenomena caused by the thin wall thickness of the main body 11, thereby increasing the service life of the main body 11.

[0044] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A toothbrush with a sealed inner cavity, characterized in that: include: A brush handle (1), the brush handle (1) comprising a main body (11), an inner cavity (12), an air inlet (13), an air inlet pipe (14) and a sealing member (15), wherein the air inlet pipe (14) is arranged on the outer surface of the main body (11), the air inlet (13) is opened on the air inlet pipe (14), the air inlet (13) is used to connect the inner cavity (12) with air, the sealing member (15) is formed by hot melting the air inlet pipe (14), and the sealing member (15) is used to seal the air inlet (13).

2. The toothbrush with a sealed inner cavity according to claim 1, characterized in that: The air inlet pipe (14) protrudes from the outer surface of the main body (11).

3. The toothbrush with a sealed inner cavity according to claim 1, characterized in that: The air intake pipe (14) is cylindrical.

4. The toothbrush with a sealed inner cavity according to claim 3, characterized in that: The height of the air intake pipe (14) is greater than the radius of the air intake pipe (14).

5. The toothbrush with a sealed inner cavity according to claim 3, characterized in that: The air inlet pipe (14) is perpendicular to the length direction of the main body (11).

6. The toothbrush with a sealed inner cavity according to claim 1, characterized in that: The toothbrush with a sealed inner cavity further comprises a two-color plastic injection-molded rubber coating (2), wherein the two-color plastic injection-molded rubber coating (2) is wrapped around the outer surface of the main body (11), and the two-color plastic injection-molded rubber coating (2) covers the air inlet (13).

7. The toothbrush with a sealed inner cavity according to claim 6, characterized in that: The two-color plastic injection molding (2) wraps the main body (11).

8. The toothbrush with a sealed inner cavity according to claim 6, characterized in that: The hardness of the two-color plastic injection molding (2) is less than or equal to the hardness of the main body (11).

9. The toothbrush with a sealed inner cavity according to claim 1, characterized in that: The toothbrush with a sealed inner cavity further comprises a brush head (3), wherein the brush head (3) is fixedly connected to the brush handle (1).

10. The toothbrush with a sealed inner cavity according to any one of claims 1 to 9, characterized in that: The wall thickness of the main body (11) is uniform.

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