Pressure relief mouthpiece and water sports equipment having the same

Abstract

A pressure relief mouthpiece for a water sports equipment is provided, which includes a connecting portion being contained by a mouth of a user and having an annular curved wall with a first hollow structure and a second hollow structure formed on the left and right sides therefor, respectively. Each hollow structure includes an upper wall, a lower wall opposite to the upper wall, an inner wall connecting to the upper wall and the lower wall, and a limiting wall disposed upward and downward from the inner wall. When the connecting portion is contained by the mouth of the user, part of the teeth of the user are configured to contact the upper wall and the lower wall of each hollow structure.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This patent application claims the benefit of U.S. Prov. Ser. No. 63 / 570,960 filed on Mar. 28, 2024, which is incorporated in its entirety by reference.BACKGROUND OF THE INVENTIONField of the Invention

[0002] The present invention relates to a pressure relief mouthpiece for a water sports equipment used, for example, for swimming training, snorkeling, scuba diving or other water activities (including both surface and underwater activities).Description of the Related Art

[0003] Nowadays, there is a wide variety of water sports equipment available, e.g., swimming goggles for swimmers, masks for snorkeling, and oxygen supply equipment for scuba diving. Among them, many equipments are required to have mouthpieces, such as the breathing pipes for swimming training, breathing pipes of two-piece snorkel masks, and even second-stage regulators or octopuses for scuba diving. For example, FIG. 1A shows a one-piece breathing pipe 101 for swimming training, in which a mouthpiece M1 is provided at the lower end portion thereof. In addition, FIG. 1B shows a two-piece breathing pipe 102 of a snorkel mask, in which a mouthpiece M2 is provided at the lower end portion thereof likewise.

[0004] To enhance the comfort of containing mouthpieces, manufacturers currently make various improvements to the contact surfaces of the mouthpieces. For instance, they may provide anti-slip structures to the surfaces that come into contact with the teeth of the user or use softer and more comfortable materials (e.g., adopting gel-filled pouches) for the containing-related parts to reduce the load on the user's teeth to bite. For example, as shown in FIG. 1C, the mouthpiece M3 features a plurality of concave and convex patterns C1 on the tooth-contacting surface F1. However, these measures are all improvements based on the assumption that the user's teeth bite the mouthpiece hard.

[0005] However, in actual use, the most comfortable situation for the user to contain the mouthpiece is that the upper and lower jaws (i.e., the upper and lower rows of teeth) are in a relaxed state with a small gap therebetween. This situation carries out activities for a longer period of time (i.e., in the situation when the user's teeth do not bite the mouthpiece so hard). Otherwise, the muscles around the mouth will quickly become sore in a short period of time, affecting the enjoyment of snorkeling. Therefore, the existing improvements still fail to meet practical needs, because snorkelers do not contain the mouthpiece very hard most of the time during activities, and thus, the improvements made to the teeth contact surfaces of a mouthpiece have very limited effectiveness. As shown in FIG. 1D, in order to address the above issue, some manufacturers have incorporated a bridge B1 within the mouthpiece M4. When the user relaxes his / her mouth to bite, the bridge B1 can still support the user's palate, preventing the mouthpiece from falling off. However, this design causes discomfort to the soft tissue of the user's palate and creates a noticeable foreign sensation in the mouth.

[0006] In view of this, how to improve the structure of the mouthpiece to solve some or all of the above problems has become the research and development goal of the industry.SUMMARY OF THE INVENTION

[0007] The main objective of the present invention is to provide a pressure relief mouthpiece for a water sports equipment, in which each of the left and right sidewalls of the mouthpiece is formed with a hollow structure, and the hollow structure has an upper wall and a lower wall separated from the upper wall. In this design, a cushion space is inherently formed between the upper wall and the lower wall so that the upper row of teeth and the lower row of teeth of the user can be elastically abutted against the upper wall and the lower wall, respectively, allowing the upper and lower rows of teeth of the user to have room to be proximal to or distal from each other, and well sustaining the user's mouth to be in a slightly open natural state. This enables the user to stably and durably contain the mouthpiece.

[0008] To achieve the above objective, the present invention discloses a pressure relief mouthpiece for a water sports equipment. The pressure relief mouthpiece includes a first connecting portion being configured to connect to the water sports equipment, and a second connecting portion being configured to be contained by a mouth of a user and being in communication with the first connecting portion. The second connecting portion has an annular curved wall. The annular curved wall has a first hollow structure and a second hollow structure formed on a left side and a right side thereof, respectively. The first hollow structure includes a first upper wall, a first lower wall opposite to the first upper wall, a first inner wall connecting the first upper wall and the first lower wall, and a first limiting wall disposed upward and downward from the first inner wall. The second hollow structure includes a second upper wall, a second lower wall opposite to the second upper wall, a second inner wall connecting the second upper wall and the second lower wall, and a second limiting wall disposed upward and downward from the second inner wall. when the second connecting portion is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall and the first lower wall of the first hollow structure, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall and the second lower wall of the second hollow structure, respectively.

[0009] In an example, the first hollow structure has a first opening defined by the first upper wall, the first lower wall and the first inner wall, and the second hollow structure has a second opening defined by the second upper wall, the second lower wall and the second inner wall.

[0010] In any of the above examples, each of the first opening and the second opening has a width ranging between 2.2 mm and 15 mm, and each of the first upper wall, the second upper wall, the first lower wall and the second lower wall has a thickness ranging between 0.8 mm and 5 mm.

[0011] In any of the above examples, each of the first hollow structure and the second hollow structure has a rounded U-shape, a cornered U-shape or a V-shape cross section. In any of the above examples, the first hollow structure has a first reinforced device and the second hollow structure has a second reinforced device.

[0012] In an example, the first reinforced device includes at least one first transverse rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes at least one second transverse rib disposed between the second upper wall and the second lower wall of the second hollow structure.

[0013] In an example, the first reinforced device includes at least one first longitudinal rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes at least one second longitudinal rib disposed between the second upper wall and the second lower wall of the second hollow structure.

[0014] In an example, the first reinforced device includes a plurality of first protrusions disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes a plurality of second protrusions disposed between the second upper wall and the second lower wall of the second hollow structure.

[0015] In any of the above examples, each of the first hollow structure and the second hollow structure is detachably connected to the left side and the right side of the annular curved wall, respectively.

[0016] In any of the above examples, each of the left side and the right side of the annular curved wall is formed with a groove structure, whereby increasing a lateral movement range of each of the first hollow structure and the second hollow structure.

[0017] In any of the above examples, the pressure relief mouthpiece further includes a multi-folded structure integrally formed between the first connecting portion and the second connecting portion so as to increase flexural freedom of the second connecting portion with respect to the first connecting portion.

[0018] In addition, based on the same objective as above, the present invention discloses a water sports equipment including a mask, a breathing pipe and a pressure relief mouthpiece of any of the above examples. The mask is configured to cover eyes and a nose of a user. The breathing pipe has an upper end portion and a lower end portion. The upper end portion provides air inlet and outlet. A fastener is provided between the upper end portion and the lower end portion to connect to the mask. The pressure relief mouthpiece is provided at the lower end portion of the breathing pipe.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1A is a schematic perspective view of a user wearing a conventional breathing pipe for swimming training.

[0020] FIG. 1B is a schematic perspective view of a mouthpiece for the conventional breathing pipe.

[0021] FIG. 1C is a schematic perspective view of another conventional mouthpiece, in which a plurality of concave and convex anti-slip structures are provided on the surface in contact with the teeth of the user.

[0022] FIG. 1D is a schematic perspective view of yet another conventional mouthpiece, in which a bridge is provided for pressing against the upper jaw of the user.

[0023] FIG. 2A is a schematic perspective view of a pressure relief mouthpiece according to an embodiment of the present invention.

[0024] FIG. 2B is a schematic top view of FIG. 2A, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are rectangular U-shape.

[0025] FIG. 2C is a schematic top view of a pressure relief mouthpiece according to another embodiment, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are V-shaped.

[0026] FIG. 2D is a schematic top view of a pressure relief mouthpiece according to yet another embodiment, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are U-shaped.

[0027] FIG. 3A is a schematic perspective view of a pressure relief mouthpiece according to an embodiment of the present invention, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a transverse rib.

[0028] FIG. 3B is a schematic perspective view of a pressure relief mouthpiece according to another embodiment, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a longitudinal rib.

[0029] FIG. 3C is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a plurality of protrusions.

[0030] FIG. 3D is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that the hollow structure is an independent and detachable component.

[0031] FIG. 3E is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that groove structures are formed on the left and right sides of the annular curved wall.

[0032] FIG. 3F is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that a multi-folded structure is formed between the first connecting portion and the second connecting portion.

[0033] FIG. 3G is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, which provides the groove structures and the multi-folded structure.

[0034] FIGS. 4A-4C depict exemplary variations of the multi-folded structure of the present invention.

[0035] FIG. 5 is a schematic perspective view illustrating a user wearing a water sports equipment of the present invention.DESCRIPTION OF THE PREFERRED EMBODIMENT

[0036] It shall be appreciated that the following description of the embodiments is only to explain the contents of the present invention, but not to limit the invention as claimed. Elements not directly related to the present invention are omitted from the description, and the dimensions as depicted for all elements in the drawings are just for easy understanding and do not intend to limit their actual scales. In addition, the used “upper,”“lower,”“front,”“back,”“left,”“right,”“inner,”“outer,” or the like adjectives defined in the descriptions are referred to by the direction of the user himself / herself. They are only relative relationships and are not limitative. When the element names involve “first” and “second,” and only the detailed structure of one of them is described, it means that both have the same structure, especially a symmetrical structure. Therefore, further repetition of the description will be omitted below.

[0037] As shown in FIG. 2A, the present invention provides a pressure relief mouthpiece 2 that can be used for a water sports equipment, such as a mouthpiece-type breathing pipe for snorkeling or any water sports equipment with a mouthpiece.

[0038] The pressure relief mouthpiece 2 includes a first connecting portion 21 and a second connecting portion 23 opposite to the first connecting portion 21. The first connecting portion 21 is configured to connect to a water sports equipment (e.g., the lower end portion of a breathing pipe). The second connecting portion 23 is configured to be contained by a mouth of a user and is communication with the first connecting portion 21.

[0039] The second connecting portion 23 has an annular curved wall 231 with a first hollow structure H1 and a second hollow structure H2 formed on the left and right sides of the annular curved wall 231, respectively. The first hollow structure H1 includes a first upper wall H11, a first lower wall H13 opposite to the first upper wall H11, a first inner wall H15 connecting the first upper wall H11 and the first lower wall H13, and a first limiting wall H17 provided on the first inner wall H15 and disposed upward and downward from the first inner wall H15. Similarly, the second hollow structure H2 includes a second upper wall H21, a second lower wall H23 opposite to the second upper wall H21, a second inner wall H25 connecting the second upper wall H21 and the second lower wall H23, and a second limiting wall H27 provided on the second inner wall H25 and disposed upward and downward from the second inner wall H25.

[0040] When the second connecting portion 23 is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall H11 and the first lower wall H13 of the first hollow structure H1, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall H21 and the second lower wall H23 of the second hollow structure H2, respectively. As such, the annular curved wall 231 is suitably accommodated between the upper gums and upper lip of the user, as well as between the lower gums and lower lip of the user. In addition, the left upper and lower rows of teeth of the user are confined between the left side of the annular curved wall 231 and the first limiting wall H17 of the first hollow structure H1, while the right upper and lower lows of teeth of the user are confined between the right side of the annular curved wall 231 and the second limiting wall H27 of the second hollow structure H2, thereby achieving the effect of positioning the entire pressure relief mouthpiece 2 in the user's mouth. In this design, two spaces are formed between the first upper wall H11 and the first lower wall H13 and between the second upper wall H21 and the second lower wall H23, respectively, to provide relative elastic cushion capabilities for the upper and lower rows of teeth.

[0041] Preferably, the first hollow structure H1 and the second hollow structure H2 can be made of thermosetting silicone rubber or thermoplastic plastic material, and have a Shore A hardness ranging between 30 and 90.

[0042] In addition, as shown in FIG. 2B, from the top view of the pressure relief mouthpiece 2, the first hollow structure H1 has a first opening H1p, and the second hollow structure H2 has a second opening H2p. The first opening H1p is defined by the first upper wall H11, the first lower wall H13 and the first inner wall H15. The second opening H2p is defined by the second upper wall H21, the second lower wall H23 and the second inner wall H25.

[0043] Each of the first opening H1p and the second opening H2p preferably has a width W ranging between 2.2 mm and 15 mm. Each of the first upper wall H11, the second upper wall H21, the first lower wall H13 and the second lower wall H23 preferably has a thickness T ranging between 0.8 mm and 5 mm. In this way, a supporting height H ranging between 3 mm and 20 mm can be achieved for the upper and lower rows of teeth of the user. Preferably, the width W of each opening ranges between 6 mm and 10 mm, and the thickness T of each upper wall and each lower wall ranges between 1.5 mm and 3 mm. With this configuration, the supporting height H for the upper and lower rows of teeth of the user can reach 7.5 mm to 13 mm.

[0044] Each of the first hollow structure H1 and the second hollow structure H2 may have a rounded U-shape, a cornered U-shape or a V-shape cross section. FIG. 2B illustrates that each of the first hollow structure H1 and the second hollow structure H2 has a cornered U-shape cross section. In another embodiment, as illustrated in FIG. 2C, each of the first hollow structure H1 and the second hollow structure H2 of the pressure relief mouthpiece 2c has a V-shape cross section. In yet another embodiment, as illustrated in FIG. 2D, each of the first hollow structure H1 and the second hollow structure H2 of the pressure relief mouthpiece 2c has a rounded U-shape cross section.

[0045] Based on the above hollow structures (i.e., the first hollow structure H1 and the second hollow structure H2), a considerable gap is formed between the upper wall and the lower wall of each hollow structure. This gap is sufficient to abut against both the upper row of teeth and the lower row of teeth, allowing the user' mouth to remain slightly open in a natural state, thereby achieving the effect of stably containing the mouthpiece without causing fatigue to the muscles near the user's mouth. Additionally, when the user intermittently wants to contain the mouthpiece harder and move the upper and lower rows of teeth closer together, there will be no obstruction due to the existence of the gap. In other words, this structure elastically allows the upper wall and the lower wall to be proximal to and distal from each other, while maintaining a distance at their original state that can abut against the user's upper and lower rows of teeth. Therefore, the user can often keep his / her mouth slightly open and relaxed.

[0046] In addition, to maintain the distance between the upper wall and the lower wall at all times and prevent them from collapsing, a reinforced device can be added to each hollow structure to improve its strength, thereby reducing the need to thicken the upper wall and the lower wall. In detail, as shown in FIG. 3A, the first hollow structure H1 of the pressure relief mouthpiece 3a may have a first reinforced device R1 including at least one first transverse rib 31. Each first transverse rib 31 is disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1, e.g., two ends thereof connect to the first upper wall H11 and the first lower wall H13. Likewise, the second hollow structure H2 of the pressure relief mouthpiece 3a may have a second reinforced device R2 including at least one second transverse rib 32. Each second transverse rib 32 is disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0047] In another embodiment, as shown in FIG. 3B, the first reinforced device R1 of the first hollow structure H1 of the pressure relief mouthpiece 3b may also include at least one first longitudinal rib 33. Each first longitudinal rib 33 is disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1. Preferably, two first longitudinal ribs 33 are disposed on the first upper wall H11 and the first lower wall H13, respectively. Likewise, the second reinforced device R2 of the second hollow structure H2 of the pressure relief mouthpiece 3b may also include at least one second longitudinal rib 34. Each second longitudinal rib 34 is disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0048] In yet another embodiment, as shown in FIG. 3C, the first reinforced device R1 of the first hollow structure H1 of the pressure relief mouthpiece 3c may also include a plurality of first protrusions 35 disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1. Likewise, the second reinforced device R2 of the second hollow structure H2 of the pressure relief mouthpiece 3c includes a plurality of second protrusions 36 disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0049] In the above examples and embodiments, the first hollow structure H1 and the second hollow structure H2 are integrally formed on the left and right sides of the annular curved wall 231, respectively. However, in yet another embodiment, the first hollow structure H1 and the second hollow structure H2 may be made into independent parts and respectively fixedly or detachably coupled to the left and right sides of the annular curved wall 231, such as the pressure relief mouthpiece 3d shown in FIG. 3D.

[0050] In addition, in an embodiment, as shown in FIG. 3E, the pressure relief mouthpiece 3e may be formed with a groove structure G1 on the left and right sides of the annular curved wall 231 (for illustrative purposes, only one side is shown). Preferably, the groove structure G1 is formed with a plurality of parallel narrow grooves with a continuous convex-concave shaped cross section. This design increases the possibility of the first hollow structure H1 and the second hollow structure H2 being proximal to or distal from each other. In other words, this design increases the lateral (i.e., left-right) movement range of the annular curved wall 231. Thus, because the annular curved wall 231 has more freedom to expand outward and contract inward, when the user contains the mouthpiece, it can be adapted to a more correct and comfortable position according to the different distances between the left and right rows of teeth, so as to be suitable for more users with mouths of different shapes or sizes.

[0051] The groove structure G1 on each of the left and right sides of the annular curved wall 231 may have at least one of a continuous zigzag shaped cross section S1 (as shown in FIG. 4A), a continuous rectangular shaped cross section S2 (as shown in FIG. 4B), and a continuous convex-concave shaped cross section S3 (as shown in FIG. 4C).

[0052] In addition, in an embodiment, as shown in FIG. 3F, the pressure relief mouthpiece 3f may have a multi-folded structure MF1 integrally formed between the first connecting portion 21 and the second connecting portion 23. The multi-folded structure MF1 can increase the flexural freedom of the second connecting portion 23 relative to the first connecting portion 21, thereby further reducing the traction burden caused by incorrect mouthpiece position, making it more convenient to use. The multi-folded structure MF1 may be made of thermosetting silicone rubber or thermoplastic plastic material with a Shore A hardness ranging between 20 and 70.

[0053] Similarly, the multi-folded structure MF1 may also have at least one of a continuous zigzag shaped cross section S1 (as shown in FIG. 4A), a continuous rectangular shaped cross section S2 (as shown in FIG. 4B), and a continuous convex-concave shaped cross section S3 (as shown in FIG. 4C).

[0054] In addition, in an embodiment, as shown in FIG. 3G, the pressure relief mouthpiece 3g may incorporate both the groove structure G1 shown in FIG. 3E and the multi-folded structure MF1 shown in FIG. 3F. This combination could provide maximum flexural freedom for the mouthpiece, both in terms of the width of containing or the direction where the mouthpiece extends.

[0055] In addition to breathing pipes for swimming training and the second-stage regulators or octopuses for scuba diving, the above pressure relief mouthpieces of the present invention can also be used in the two-piece snorkel equipment (i.e., a breathing pipe in combination with a diving mask that is not in communication with the breathing pipe), or even other types of diving masks, such as the one-piece snorkel equipment with a mouthpiece developed by the inventor of the present invention (i.e., a breathable mask in which the breathing pipe and the mask body are in communication with each other).

[0056] Taking a two-piece snorkel equipment as an example, as shown in FIG. 5, the water sports equipment 5 includes a mask 51, a breathing pipe 53 and a pressure relief mouthpiece 55 as described in any of the above examples or embodiments (i.e., the pressure relief mouthpieces 2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g). The mask 51 is configured to cover eyes and a nose of a user. The breathing pipe 53 has an upper end portion 53a and a lower end portion 53b opposite to the upper end portion 53a. The upper end portion 53a provides air inlet and outlet. A fastener 53c is disposed between the upper end portion 53a and the lower end portion 53b to be connected to the mask 51. The pressure relief mouthpiece 55 is provided at the lower end portion 53b of the breathing pipe 53.

[0057] The focus of the present invention lies in the hollow structures on either side of the above mouthpieces. How other parts are designed, or what kind of water sports equipment it is used for are not the focus of this invention. Any modifications based on the above core technology of the present invention are intended to be protected. Consequently, the above embodiments are used only to illustrate the implementations of the present invention and to explain the technical features of the present invention, and are not used to limit the scope of the present invention. Any modifications or equivalent arrangements that can be easily accomplished by those skilled in the art are considered to fall within the scope of the present invention, and the scope of the present invention should be limited by the claims of the patent application.

Examples

Embodiment Construction

[0036]It shall be appreciated that the following description of the embodiments is only to explain the contents of the present invention, but not to limit the invention as claimed. Elements not directly related to the present invention are omitted from the description, and the dimensions as depicted for all elements in the drawings are just for easy understanding and do not intend to limit their actual scales. In addition, the used “upper,”“lower,”“front,”“back,”“left,”“right,”“inner,”“outer,” or the like adjectives defined in the descriptions are referred to by the direction of the user himself / herself. They are only relative relationships and are not limitative. When the element names involve “first” and “second,” and only the detailed structure of one of them is described, it means that both have the same structure, especially a symmetrical structure. Therefore, further repetition of the description will be omitted below.

[0037]As shown in FIG. 2A, the present invention provides a...

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This patent application claims the benefit of U.S. Prov. Ser. No. 63 / 570,960 filed on Mar. 28, 2024, which is incorporated in its entirety by reference.BACKGROUND OF THE INVENTIONField of the Invention

[0002] The present invention relates to a pressure relief mouthpiece for a water sports equipment used, for example, for swimming training, snorkeling, scuba diving or other water activities (including both surface and underwater activities).Description of the Related Art

[0003] Nowadays, there is a wide variety of water sports equipment available, e.g., swimming goggles for swimmers, masks for snorkeling, and oxygen supply equipment for scuba diving. Among them, many equipments are required to have mouthpieces, such as the breathing pipes for swimming training, breathing pipes of two-piece snorkel masks, and even second-stage regulators or octopuses for scuba diving. For example, FIG. 1A shows a one-piece breathing pipe 101 for swimming training, in which a mouthpiece M1 is provided at the lower end portion thereof. In addition, FIG. 1B shows a two-piece breathing pipe 102 of a snorkel mask, in which a mouthpiece M2 is provided at the lower end portion thereof likewise.

[0004] To enhance the comfort of containing mouthpieces, manufacturers currently make various improvements to the contact surfaces of the mouthpieces. For instance, they may provide anti-slip structures to the surfaces that come into contact with the teeth of the user or use softer and more comfortable materials (e.g., adopting gel-filled pouches) for the containing-related parts to reduce the load on the user's teeth to bite. For example, as shown in FIG. 1C, the mouthpiece M3 features a plurality of concave and convex patterns C1 on the tooth-contacting surface F1. However, these measures are all improvements based on the assumption that the user's teeth bite the mouthpiece hard.

[0005] However, in actual use, the most comfortable situation for the user to contain the mouthpiece is that the upper and lower jaws (i.e., the upper and lower rows of teeth) are in a relaxed state with a small gap therebetween. This situation carries out activities for a longer period of time (i.e., in the situation when the user's teeth do not bite the mouthpiece so hard). Otherwise, the muscles around the mouth will quickly become sore in a short period of time, affecting the enjoyment of snorkeling. Therefore, the existing improvements still fail to meet practical needs, because snorkelers do not contain the mouthpiece very hard most of the time during activities, and thus, the improvements made to the teeth contact surfaces of a mouthpiece have very limited effectiveness. As shown in FIG. 1D, in order to address the above issue, some manufacturers have incorporated a bridge B1 within the mouthpiece M4. When the user relaxes his / her mouth to bite, the bridge B1 can still support the user's palate, preventing the mouthpiece from falling off. However, this design causes discomfort to the soft tissue of the user's palate and creates a noticeable foreign sensation in the mouth.

[0006] In view of this, how to improve the structure of the mouthpiece to solve some or all of the above problems has become the research and development goal of the industry.SUMMARY OF THE INVENTION

[0007] The main objective of the present invention is to provide a pressure relief mouthpiece for a water sports equipment, in which each of the left and right sidewalls of the mouthpiece is formed with a hollow structure, and the hollow structure has an upper wall and a lower wall separated from the upper wall. In this design, a cushion space is inherently formed between the upper wall and the lower wall so that the upper row of teeth and the lower row of teeth of the user can be elastically abutted against the upper wall and the lower wall, respectively, allowing the upper and lower rows of teeth of the user to have room to be proximal to or distal from each other, and well sustaining the user's mouth to be in a slightly open natural state. This enables the user to stably and durably contain the mouthpiece.

[0008] To achieve the above objective, the present invention discloses a pressure relief mouthpiece for a water sports equipment. The pressure relief mouthpiece includes a first connecting portion being configured to connect to the water sports equipment, and a second connecting portion being configured to be contained by a mouth of a user and being in communication with the first connecting portion. The second connecting portion has an annular curved wall. The annular curved wall has a first hollow structure and a second hollow structure formed on a left side and a right side thereof, respectively. The first hollow structure includes a first upper wall, a first lower wall opposite to the first upper wall, a first inner wall connecting the first upper wall and the first lower wall, and a first limiting wall disposed upward and downward from the first inner wall. The second hollow structure includes a second upper wall, a second lower wall opposite to the second upper wall, a second inner wall connecting the second upper wall and the second lower wall, and a second limiting wall disposed upward and downward from the second inner wall. when the second connecting portion is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall and the first lower wall of the first hollow structure, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall and the second lower wall of the second hollow structure, respectively.

[0009] In an example, the first hollow structure has a first opening defined by the first upper wall, the first lower wall and the first inner wall, and the second hollow structure has a second opening defined by the second upper wall, the second lower wall and the second inner wall.

[0010] In any of the above examples, each of the first opening and the second opening has a width ranging between 2.2 mm and 15 mm, and each of the first upper wall, the second upper wall, the first lower wall and the second lower wall has a thickness ranging between 0.8 mm and 5 mm.

[0011] In any of the above examples, each of the first hollow structure and the second hollow structure has a rounded U-shape, a cornered U-shape or a V-shape cross section. In any of the above examples, the first hollow structure has a first reinforced device and the second hollow structure has a second reinforced device.

[0012] In an example, the first reinforced device includes at least one first transverse rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes at least one second transverse rib disposed between the second upper wall and the second lower wall of the second hollow structure.

[0013] In an example, the first reinforced device includes at least one first longitudinal rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes at least one second longitudinal rib disposed between the second upper wall and the second lower wall of the second hollow structure.

[0014] In an example, the first reinforced device includes a plurality of first protrusions disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device includes a plurality of second protrusions disposed between the second upper wall and the second lower wall of the second hollow structure.

[0015] In any of the above examples, each of the first hollow structure and the second hollow structure is detachably connected to the left side and the right side of the annular curved wall, respectively.

[0016] In any of the above examples, each of the left side and the right side of the annular curved wall is formed with a groove structure, whereby increasing a lateral movement range of each of the first hollow structure and the second hollow structure.

[0017] In any of the above examples, the pressure relief mouthpiece further includes a multi-folded structure integrally formed between the first connecting portion and the second connecting portion so as to increase flexural freedom of the second connecting portion with respect to the first connecting portion.

[0018] In addition, based on the same objective as above, the present invention discloses a water sports equipment including a mask, a breathing pipe and a pressure relief mouthpiece of any of the above examples. The mask is configured to cover eyes and a nose of a user. The breathing pipe has an upper end portion and a lower end portion. The upper end portion provides air inlet and outlet. A fastener is provided between the upper end portion and the lower end portion to connect to the mask. The pressure relief mouthpiece is provided at the lower end portion of the breathing pipe.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1A is a schematic perspective view of a user wearing a conventional breathing pipe for swimming training.

[0020] FIG. 1B is a schematic perspective view of a mouthpiece for the conventional breathing pipe.

[0021] FIG. 1C is a schematic perspective view of another conventional mouthpiece, in which a plurality of concave and convex anti-slip structures are provided on the surface in contact with the teeth of the user.

[0022] FIG. 1D is a schematic perspective view of yet another conventional mouthpiece, in which a bridge is provided for pressing against the upper jaw of the user.

[0023] FIG. 2A is a schematic perspective view of a pressure relief mouthpiece according to an embodiment of the present invention.

[0024] FIG. 2B is a schematic top view of FIG. 2A, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are rectangular U-shape.

[0025] FIG. 2C is a schematic top view of a pressure relief mouthpiece according to another embodiment, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are V-shaped.

[0026] FIG. 2D is a schematic top view of a pressure relief mouthpiece according to yet another embodiment, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are U-shaped.

[0027] FIG. 3A is a schematic perspective view of a pressure relief mouthpiece according to an embodiment of the present invention, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a transverse rib.

[0028] FIG. 3B is a schematic perspective view of a pressure relief mouthpiece according to another embodiment, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a longitudinal rib.

[0029] FIG. 3C is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, in which the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a plurality of protrusions.

[0030] FIG. 3D is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that the hollow structure is an independent and detachable component.

[0031] FIG. 3E is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that groove structures are formed on the left and right sides of the annular curved wall.

[0032] FIG. 3F is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, showing that a multi-folded structure is formed between the first connecting portion and the second connecting portion.

[0033] FIG. 3G is a schematic perspective view of a pressure relief mouthpiece according to yet another embodiment, which provides the groove structures and the multi-folded structure.

[0034] FIGS. 4A-4C depict exemplary variations of the multi-folded structure of the present invention.

[0035] FIG. 5 is a schematic perspective view illustrating a user wearing a water sports equipment of the present invention.DESCRIPTION OF THE PREFERRED EMBODIMENT

[0036] It shall be appreciated that the following description of the embodiments is only to explain the contents of the present invention, but not to limit the invention as claimed. Elements not directly related to the present invention are omitted from the description, and the dimensions as depicted for all elements in the drawings are just for easy understanding and do not intend to limit their actual scales. In addition, the used “upper,”“lower,”“front,”“back,”“left,”“right,”“inner,”“outer,” or the like adjectives defined in the descriptions are referred to by the direction of the user himself / herself. They are only relative relationships and are not limitative. When the element names involve “first” and “second,” and only the detailed structure of one of them is described, it means that both have the same structure, especially a symmetrical structure. Therefore, further repetition of the description will be omitted below.

[0037] As shown in FIG. 2A, the present invention provides a pressure relief mouthpiece 2 that can be used for a water sports equipment, such as a mouthpiece-type breathing pipe for snorkeling or any water sports equipment with a mouthpiece.

[0038] The pressure relief mouthpiece 2 includes a first connecting portion 21 and a second connecting portion 23 opposite to the first connecting portion 21. The first connecting portion 21 is configured to connect to a water sports equipment (e.g., the lower end portion of a breathing pipe). The second connecting portion 23 is configured to be contained by a mouth of a user and is communication with the first connecting portion 21.

[0039] The second connecting portion 23 has an annular curved wall 231 with a first hollow structure H1 and a second hollow structure H2 formed on the left and right sides of the annular curved wall 231, respectively. The first hollow structure H1 includes a first upper wall H11, a first lower wall H13 opposite to the first upper wall H11, a first inner wall H15 connecting the first upper wall H11 and the first lower wall H13, and a first limiting wall H17 provided on the first inner wall H15 and disposed upward and downward from the first inner wall H15. Similarly, the second hollow structure H2 includes a second upper wall H21, a second lower wall H23 opposite to the second upper wall H21, a second inner wall H25 connecting the second upper wall H21 and the second lower wall H23, and a second limiting wall H27 provided on the second inner wall H25 and disposed upward and downward from the second inner wall H25.

[0040] When the second connecting portion 23 is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall H11 and the first lower wall H13 of the first hollow structure H1, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall H21 and the second lower wall H23 of the second hollow structure H2, respectively. As such, the annular curved wall 231 is suitably accommodated between the upper gums and upper lip of the user, as well as between the lower gums and lower lip of the user. In addition, the left upper and lower rows of teeth of the user are confined between the left side of the annular curved wall 231 and the first limiting wall H17 of the first hollow structure H1, while the right upper and lower lows of teeth of the user are confined between the right side of the annular curved wall 231 and the second limiting wall H27 of the second hollow structure H2, thereby achieving the effect of positioning the entire pressure relief mouthpiece 2 in the user's mouth. In this design, two spaces are formed between the first upper wall H11 and the first lower wall H13 and between the second upper wall H21 and the second lower wall H23, respectively, to provide relative elastic cushion capabilities for the upper and lower rows of teeth.

[0041] Preferably, the first hollow structure H1 and the second hollow structure H2 can be made of thermosetting silicone rubber or thermoplastic plastic material, and have a Shore A hardness ranging between 30 and 90.

[0042] In addition, as shown in FIG. 2B, from the top view of the pressure relief mouthpiece 2, the first hollow structure H1 has a first opening H1p, and the second hollow structure H2 has a second opening H2p. The first opening H1p is defined by the first upper wall H11, the first lower wall H13 and the first inner wall H15. The second opening H2p is defined by the second upper wall H21, the second lower wall H23 and the second inner wall H25.

[0043] Each of the first opening H1p and the second opening H2p preferably has a width W ranging between 2.2 mm and 15 mm. Each of the first upper wall H11, the second upper wall H21, the first lower wall H13 and the second lower wall H23 preferably has a thickness T ranging between 0.8 mm and 5 mm. In this way, a supporting height H ranging between 3 mm and 20 mm can be achieved for the upper and lower rows of teeth of the user. Preferably, the width W of each opening ranges between 6 mm and 10 mm, and the thickness T of each upper wall and each lower wall ranges between 1.5 mm and 3 mm. With this configuration, the supporting height H for the upper and lower rows of teeth of the user can reach 7.5 mm to 13 mm.

[0044] Each of the first hollow structure H1 and the second hollow structure H2 may have a rounded U-shape, a cornered U-shape or a V-shape cross section. FIG. 2B illustrates that each of the first hollow structure H1 and the second hollow structure H2 has a cornered U-shape cross section. In another embodiment, as illustrated in FIG. 2C, each of the first hollow structure H1 and the second hollow structure H2 of the pressure relief mouthpiece 2c has a V-shape cross section. In yet another embodiment, as illustrated in FIG. 2D, each of the first hollow structure H1 and the second hollow structure H2 of the pressure relief mouthpiece 2c has a rounded U-shape cross section.

[0045] Based on the above hollow structures (i.e., the first hollow structure H1 and the second hollow structure H2), a considerable gap is formed between the upper wall and the lower wall of each hollow structure. This gap is sufficient to abut against both the upper row of teeth and the lower row of teeth, allowing the user' mouth to remain slightly open in a natural state, thereby achieving the effect of stably containing the mouthpiece without causing fatigue to the muscles near the user's mouth. Additionally, when the user intermittently wants to contain the mouthpiece harder and move the upper and lower rows of teeth closer together, there will be no obstruction due to the existence of the gap. In other words, this structure elastically allows the upper wall and the lower wall to be proximal to and distal from each other, while maintaining a distance at their original state that can abut against the user's upper and lower rows of teeth. Therefore, the user can often keep his / her mouth slightly open and relaxed.

[0046] In addition, to maintain the distance between the upper wall and the lower wall at all times and prevent them from collapsing, a reinforced device can be added to each hollow structure to improve its strength, thereby reducing the need to thicken the upper wall and the lower wall. In detail, as shown in FIG. 3A, the first hollow structure H1 of the pressure relief mouthpiece 3a may have a first reinforced device R1 including at least one first transverse rib 31. Each first transverse rib 31 is disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1, e.g., two ends thereof connect to the first upper wall H11 and the first lower wall H13. Likewise, the second hollow structure H2 of the pressure relief mouthpiece 3a may have a second reinforced device R2 including at least one second transverse rib 32. Each second transverse rib 32 is disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0047] In another embodiment, as shown in FIG. 3B, the first reinforced device R1 of the first hollow structure H1 of the pressure relief mouthpiece 3b may also include at least one first longitudinal rib 33. Each first longitudinal rib 33 is disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1. Preferably, two first longitudinal ribs 33 are disposed on the first upper wall H11 and the first lower wall H13, respectively. Likewise, the second reinforced device R2 of the second hollow structure H2 of the pressure relief mouthpiece 3b may also include at least one second longitudinal rib 34. Each second longitudinal rib 34 is disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0048] In yet another embodiment, as shown in FIG. 3C, the first reinforced device R1 of the first hollow structure H1 of the pressure relief mouthpiece 3c may also include a plurality of first protrusions 35 disposed between the first upper wall H11 and the first lower wall H13 of the first hollow structure H1. Likewise, the second reinforced device R2 of the second hollow structure H2 of the pressure relief mouthpiece 3c includes a plurality of second protrusions 36 disposed between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0049] In the above examples and embodiments, the first hollow structure H1 and the second hollow structure H2 are integrally formed on the left and right sides of the annular curved wall 231, respectively. However, in yet another embodiment, the first hollow structure H1 and the second hollow structure H2 may be made into independent parts and respectively fixedly or detachably coupled to the left and right sides of the annular curved wall 231, such as the pressure relief mouthpiece 3d shown in FIG. 3D.

[0050] In addition, in an embodiment, as shown in FIG. 3E, the pressure relief mouthpiece 3e may be formed with a groove structure G1 on the left and right sides of the annular curved wall 231 (for illustrative purposes, only one side is shown). Preferably, the groove structure G1 is formed with a plurality of parallel narrow grooves with a continuous convex-concave shaped cross section. This design increases the possibility of the first hollow structure H1 and the second hollow structure H2 being proximal to or distal from each other. In other words, this design increases the lateral (i.e., left-right) movement range of the annular curved wall 231. Thus, because the annular curved wall 231 has more freedom to expand outward and contract inward, when the user contains the mouthpiece, it can be adapted to a more correct and comfortable position according to the different distances between the left and right rows of teeth, so as to be suitable for more users with mouths of different shapes or sizes.

[0051] The groove structure G1 on each of the left and right sides of the annular curved wall 231 may have at least one of a continuous zigzag shaped cross section S1 (as shown in FIG. 4A), a continuous rectangular shaped cross section S2 (as shown in FIG. 4B), and a continuous convex-concave shaped cross section S3 (as shown in FIG. 4C).

[0052] In addition, in an embodiment, as shown in FIG. 3F, the pressure relief mouthpiece 3f may have a multi-folded structure MF1 integrally formed between the first connecting portion 21 and the second connecting portion 23. The multi-folded structure MF1 can increase the flexural freedom of the second connecting portion 23 relative to the first connecting portion 21, thereby further reducing the traction burden caused by incorrect mouthpiece position, making it more convenient to use. The multi-folded structure MF1 may be made of thermosetting silicone rubber or thermoplastic plastic material with a Shore A hardness ranging between 20 and 70.

[0053] Similarly, the multi-folded structure MF1 may also have at least one of a continuous zigzag shaped cross section S1 (as shown in FIG. 4A), a continuous rectangular shaped cross section S2 (as shown in FIG. 4B), and a continuous convex-concave shaped cross section S3 (as shown in FIG. 4C).

[0054] In addition, in an embodiment, as shown in FIG. 3G, the pressure relief mouthpiece 3g may incorporate both the groove structure G1 shown in FIG. 3E and the multi-folded structure MF1 shown in FIG. 3F. This combination could provide maximum flexural freedom for the mouthpiece, both in terms of the width of containing or the direction where the mouthpiece extends.

[0055] In addition to breathing pipes for swimming training and the second-stage regulators or octopuses for scuba diving, the above pressure relief mouthpieces of the present invention can also be used in the two-piece snorkel equipment (i.e., a breathing pipe in combination with a diving mask that is not in communication with the breathing pipe), or even other types of diving masks, such as the one-piece snorkel equipment with a mouthpiece developed by the inventor of the present invention (i.e., a breathable mask in which the breathing pipe and the mask body are in communication with each other).

[0056] Taking a two-piece snorkel equipment as an example, as shown in FIG. 5, the water sports equipment 5 includes a mask 51, a breathing pipe 53 and a pressure relief mouthpiece 55 as described in any of the above examples or embodiments (i.e., the pressure relief mouthpieces 2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g). The mask 51 is configured to cover eyes and a nose of a user. The breathing pipe 53 has an upper end portion 53a and a lower end portion 53b opposite to the upper end portion 53a. The upper end portion 53a provides air inlet and outlet. A fastener 53c is disposed between the upper end portion 53a and the lower end portion 53b to be connected to the mask 51. The pressure relief mouthpiece 55 is provided at the lower end portion 53b of the breathing pipe 53.

[0057] The focus of the present invention lies in the hollow structures on either side of the above mouthpieces. How other parts are designed, or what kind of water sports equipment it is used for are not the focus of this invention. Any modifications based on the above core technology of the present invention are intended to be protected. Consequently, the above embodiments are used only to illustrate the implementations of the present invention and to explain the technical features of the present invention, and are not used to limit the scope of the present invention. Any modifications or equivalent arrangements that can be easily accomplished by those skilled in the art are considered to fall within the scope of the present invention, and the scope of the present invention should be limited by the claims of the patent application.

Examples

Embodiment Construction

[0036]It shall be appreciated that the following description of the embodiments is only to explain the contents of the present invention, but not to limit the invention as claimed. Elements not directly related to the present invention are omitted from the description, and the dimensions as depicted for all elements in the drawings are just for easy understanding and do not intend to limit their actual scales. In addition, the used “upper,”“lower,”“front,”“back,”“left,”“right,”“inner,”“outer,” or the like adjectives defined in the descriptions are referred to by the direction of the user himself / herself. They are only relative relationships and are not limitative. When the element names involve “first” and “second,” and only the detailed structure of one of them is described, it means that both have the same structure, especially a symmetrical structure. Therefore, further repetition of the description will be omitted below.

[0037]As shown in FIG. 2A, the present invention provides a...

Claims

1. A pressure relief mouthpiece for a water sports equipment, comprising:a first connecting portion, being configured to connect to the water sports equipment; anda second connecting portion, being configured to be contained by a mouth of a user and being in communication with the first connecting portion;characterized in that:the second connecting portion has an annular curved wall with a first hollow structure and a second hollow structure formed on a left side and a right side thereof, respectively;the first hollow structure comprises:a first upper wall;a first lower wall opposite to the first upper wall;a first inner wall connecting to the first upper wall and the first lower wall; anda first limiting wall disposed upward and downward from the first inner wall;the second hollow structure comprises:a second upper wall;a second lower wall opposite to the second upper wall;a second inner wall connecting to the second upper wall and the second lower wall; anda second limiting wall disposed upward and downward from the second inner wall;when the second connecting portion is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall and the first lower wall of the first hollow structure, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall and the second lower wall of the second hollow structure, respectively.

2. The pressure relief mouthpiece of claim 1, wherein the first hollow structure has a first opening defined by the first upper wall, the first lower wall and the first inner wall, and the second hollow structure has a second opening defined by the second upper wall, the second lower wall and the second inner wall.

3. The pressure relief mouthpiece of claim 2, wherein each of the first opening and the second opening has a width ranging between 2.2 mm and 15 mm, and each of the first upper wall, the second upper wall, the first lower wall and the second lower wall has a thickness ranging between 0.8 mm and 5 mm.

4. The pressure relief mouthpiece of claim 3, wherein each of the first hollow structure and the second hollow structure has a rounded U-shape, a cornered U-shape or a V-shape cross section.

5. The pressure relief mouthpiece of claim 1, wherein the first hollow structure has a first reinforced device and the second hollow structure has a second reinforced device.

6. The pressure relief mouthpiece of claim 5, wherein the first reinforced device comprises at least one first transverse rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises at least one second transverse rib disposed between the second upper wall and the second lower wall of the second hollow structure.

7. The pressure relief mouthpiece of claim 5, wherein the first reinforced device comprises at least one first longitudinal rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises at least one second longitudinal rib disposed between the second upper wall and the second lower wall of the second hollow structure.

8. The pressure relief mouthpiece of claim 5, wherein the first reinforced device comprises a plurality of first protrusions disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises a plurality of second protrusions disposed between the second upper wall and the second lower wall of the second hollow structure.

9. The pressure relief mouthpiece of claim 1, wherein each of the first hollow structure and the second hollow structure is detachably connected to the left side and the right side of the annular curved wall, respectively.

10. The pressure relief mouthpiece of claim 1, wherein each of the left side and the right side of the annular curved wall is formed with a groove structure, whereby increasing a lateral movement range of each of the first hollow structure and the second hollow structure.

11. A water sports equipment comprising:a mask, being configured to cover eyes and a nose of a user;a breathing pipe having an upper end portion and a lower end portion, wherein the upper end portion provides air inlet and outlet, and a fastener is provided between the upper end portion and the lower end portion to connect to the mask; anda pressure relief mouthpiece provided at the lower end portion of the breathing pipe, the pressure relief mouthpiece comprising:a first connecting portion, being configured to connect to the water sports equipment; anda second connecting portion, being configured to be contained by a mouth of a user and being in communication with the first connecting portion;characterized in that:the second connecting portion has an annular curved wall with a first hollow structure and a second hollow structure formed on a left side and a right side thereof, respectively;the first hollow structure comprises:a first upper wall;a first lower wall opposite to the first upper wall;a first inner wall connecting to the first upper wall and the first lower wall; anda first limiting wall disposed upward and downward from the first inner wall;the second hollow structure comprises:a second upper wall;a second lower wall opposite to the second upper wall;a second inner wall connecting to the second upper wall and the second lower wall; anda second limiting wall disposed upward and downward from the second inner wall;when the second connecting portion is contained by the mouth of the user, an upper left row of teeth and a lower left row of teeth of the user are configured to contact the first upper wall and the first lower wall of the first hollow structure, respectively, and an upper right row of teeth and a lower right row of teeth of the user are configured to contact the second upper wall and the second lower wall of the second hollow structure, respectively.

12. The pressure relief mouthpiece of claim 11, wherein the first hollow structure has a first opening defined by the first upper wall, the first lower wall and the first inner wall, and the second hollow structure has a second opening defined by the second upper wall, the second lower wall and the second inner wall.

13. The pressure relief mouthpiece of claim 12, wherein each of the first opening and the second opening has a width ranging between 2.2 mm and 15 mm, and each of the first upper wall, the second upper wall, the first lower wall and the second lower wall has a thickness ranging between 0.8 mm and 5 mm.

14. The pressure relief mouthpiece of claim 13, wherein each of the first hollow structure and the second hollow structure has a rounded U-shape, a cornered U-shape or a V-shape cross section.

15. The pressure relief mouthpiece of claim 11, wherein the first hollow structure has a first reinforced device and the second hollow structure has a second reinforced device.

16. The pressure relief mouthpiece of claim 15, wherein the first reinforced device comprises at least one first transverse rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises at least one second transverse rib disposed between the second upper wall and the second lower wall of the second hollow structure.

17. The pressure relief mouthpiece of claim 15, wherein the first reinforced device comprises at least one first longitudinal rib disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises at least one second longitudinal rib disposed between the second upper wall and the second lower wall of the second hollow structure.

18. The pressure relief mouthpiece of claim 15, wherein the first reinforced device comprises a plurality of first protrusions disposed between the first upper wall and the first lower wall of the first hollow structure, and the second reinforced device comprises a plurality of second protrusions disposed between the second upper wall and the second lower wall of the second hollow structure.

19. The pressure relief mouthpiece of claim 11, wherein each of the first hollow structure and the second hollow structure is detachably connected to the left side and the right side of the annular curved wall, respectively.

20. The pressure relief mouthpiece of claim 11, wherein each of the left side and the right side of the annular curved wall is formed with a groove structure, whereby increasing a lateral movement range of each of the first hollow structure and the second hollow structure.

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