PRESSURE RELIEF MOUTHPIECE AND WATER SPORTS EQUIPMENT WITH THE SAME

Abstract

A pressure relief mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) for water sports equipment (5) is provided, which includes a connecting portion (23) contained by a user's mouth and 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 thereof, respectively. Each hollow structure (H1, H2) includes an upper wall (H11, H21), a lower wall (H13, H23) opposite the upper wall, an inner wall (H15, H25) connected to the upper wall and the lower wall, and a boundary wall (H17, H27) arranged upwards and downwards from the inner wall. When the connecting portion is contained by the user's mouth, a part of the user's teeth is configured to contact the upper wall and the lower wall of each hollow structure.

Description

BACKGROUND OF THE INVENTIONField of the invention

[0001] The present invention relates to a pressure relief mouthpiece for 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 state of the art

[0002] Today, there is a wide variety of water sports equipment, such as goggles for swimmers, snorkeling masks, and oxygen supply equipment for scuba diving. Among them, many equipment requires mouthpieces, such as breathing tubes for swimming training, breathing tubes for two-piece snorkel masks, and even second-stage regulators or octopuses for recreational diving. For example, Fig. 1A shows a one-piece breathing tube 101 for swimming training, in which a mouthpiece M1 is provided at the lower end portion thereof. Fig. 1B a two-part breathing tube 102 of a snorkel mask in which a mouthpiece M2 is also provided at the lower end portion thereof.

[0003] To increase the comfort of mouthpieces, manufacturers are currently making various improvements to the contact surfaces of mouthpieces. For example, they can provide anti-slip structures for the surfaces that come into contact with the user's teeth, or use softer and more comfortable materials (e.g., the use of gel-filled pouches) for the receiving-related parts to reduce the strain on the user's teeth when biting. For example, as shown in Fig. As shown in Figure 1C, the mouthpiece M3 has a plurality of concave and convex patterns C1 on the tooth contact surface F1. However, these measures are all improvements based on the assumption that the user's teeth bite the mouthpiece hard.

[0004] 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 between them. This situation performs activities for a longer period of time (i.e., in the situation where the user's teeth do not bite the mouthpiece so hard). Otherwise, the muscles around the mouth will quickly become painful in a short period of time, which will affect the fun of snorkeling. Therefore, the existing improvements still do not meet practical requirements, because snorkelers do not hold the mouthpiece very hard most of the time during activities, and thus, the improvements made to the tooth contact surfaces of a mouthpiece have very limited effectiveness. As in Fig. As shown in Figure 1D, some manufacturers have incorporated a B1 bridge into the M4 mouthpiece to address the above problem. When the user relaxes their mouth to bite, the B1 bridge can still support the user's palate and prevent the mouthpiece from falling off. However, this design causes discomfort to the user's soft tissues of the palate and creates a noticeable foreign sensation in the mouth.

[0005] In view of this, improving 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

[0006] The main objective of the present invention is to provide a pressure relief mouthpiece for a water sports device, wherein each of the left and right side walls of the mouthpiece is formed with a hollow structure, and the hollow structure includes an upper wall and a lower wall separated from the upper wall. With this construction, a cushioning space is inherently formed between the upper wall and the lower wall, allowing the user's upper and lower teeth to elastically abut against the upper and lower walls, respectively, allowing the user's upper and lower teeth to have space to be proximal to or distal from each other, and well allowing the user's mouth to be in a slightly open natural state. This allows the user to contain the mouthpiece stably and durably.

[0007] To achieve the above object, the present invention discloses a pressure relief mouthpiece for a water sports device. The pressure relief mouthpiece includes a first connecting portion configured to be connected to the water sports device, and a second connecting portion configured to be contained by a user's mouth and communicating 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 the first upper wall, a first inner wall connecting the first upper wall and the first lower wall, and a first boundary wall arranged upward and downward from the first inner wall. When the second connecting portion is contained by the user's mouth, 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.

[0008] In one 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.

[0009] 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 top wall, the second top wall, the first bottom wall, and the second bottom wall has a thickness ranging between 0.8 mm and 5 mm.

[0010] In any of the above examples, each of the first hollow structure and the second hollow structure has a rounded U-shape, a square U-shape, or a V-shaped cross-section.

[0011] In one of the above examples, the first hollow structure comprises a first reinforced device and the second hollow structure comprises a second reinforced device.

[0012] In one 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 one 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 one 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 one of the above examples, each of the left side and the right side of the annular curved wall is formed with a groove structure, thereby 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 to increase the bending freedom of the second connecting portion with respect to the first connecting portion.

[0018] Additionally, based on the same objective as above, the present invention discloses a water sports device including a mask, a breathing tube, and a pressure relief mouthpiece of any one of the above examples. The mask is configured to cover the eyes and nose of a user. The breathing tube 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 be connected to the mask. The pressure relief mouthpiece is provided at the lower end portion of the breathing tube. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1A is a schematic perspective view of a user wearing a conventional swimming training breathing tube. Fig. Figure 1B is a schematic perspective view of a mouthpiece for the conventional breathing tube. 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 user's teeth. Fig. Figure 1D is a schematic perspective view of another conventional mouthpiece in which a bridge is provided for pressing against the user's upper jaw. Fig. 2A is a schematic perspective view of a pressure relief nozzle according to an embodiment of the present invention. Fig. Figure 2B is a schematic plan view of Fig. 2A, in which the openings of the hollow structures on both sides of the pressure relief mouthpiece are rectangular U-shaped. Fig. 2C is a schematic plan view of a pressure relief nozzle according to another embodiment in which the openings of the hollow structures on both sides of the pressure relief nozzle are V-shaped. Fig. 2D is a schematic plan view of a pressure relief nozzle according to another embodiment in which the openings of the hollow structures on both sides of the pressure relief nozzle are U-shaped. Fig. 3A is a schematic perspective view of a pressure relief nozzle according to an embodiment of the present invention, in which the reinforced device disposed between the top wall and the bottom wall of the hollow structure is a transverse rib. Fig. Figure 3B is a schematic perspective view of a pressure relief nozzle according to another embodiment in which the reinforced device disposed between the top wall and the bottom wall of the hollow structure is a longitudinal rib. Fig. 3C is a schematic perspective view of a pressure relief nozzle according to another embodiment in which the reinforced device disposed between the top wall and the bottom wall of the hollow structure is a plurality of projections. Fig. Figure 3D is a schematic perspective view of a pressure relief nozzle according to another embodiment, showing that the hollow structure is an independent and detachable component. Fig. 3E is a schematic perspective view of a pressure relief nozzle according to another embodiment, showing that groove structures are formed on the left and right sides of the annular curved wall. Fig. 3F is a schematic perspective view of a pressure relief mouthpiece according to another embodiment, showing that a multi-folded structure is formed between the first connecting portion and the second connecting portion. Fig. Figure 3G is a schematic perspective view of a pressure relief mouthpiece according to another embodiment providing the groove structures and the multi-folded structure. Fig. 4A-4C illustrate exemplary variations of the multifolded structure of the present invention. Fig. 5 is a schematic perspective view illustrating a user wearing a water sports device of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] It should be understood that the following description of the embodiments is only intended to explain the content of the present invention, but not to limit the claimed invention. Elements not directly related to the present invention are omitted from the description, and the dimensions as shown for all elements in the drawings are only for easy understanding and do not intend to limit their actual scales. In addition, the adjectives "upper", "lower", "front", "rear", "left", "right", "inner", "outer", or the like defined in the descriptions are designated by the user's own instruction. They are only relative relationships and are not limitative.If the element names include "first" and "second," and only the detailed structure of one of them is described, this means that both have the same structure, in particular, a symmetrical structure. Therefore, further repetition of the description will be omitted below.

[0020] As in Fig. 2A, the present invention provides a pressure relief mouthpiece 2 that can be used for water sports equipment, such as a mouthpiece-type breathing tube for snorkeling or any water sports equipment having a mouthpiece.

[0021] The pressure relief mouthpiece 2 includes a first connecting portion 21 and a second connecting portion 23 opposite the first connecting portion 21. The first connecting portion 21 is configured to be connected to water sports equipment (e.g., the lower end portion of a breathing tube). The second connecting portion 23 is configured to be contained in a user's mouth and communicates with the first connecting portion 21.

[0022] The second connecting portion 23 includes an annular curved wall 231 having 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 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 boundary wall H17 provided on the first inner wall H15 and arranged up and down 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 boundary wall H27 provided on the second inner wall H25 and arranged up and down from the second inner wall H25.

[0023] When the second connecting portion 23 is contained by the user's mouth, 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. Thus, the annular curved wall 231 is appropriately accommodated between the user's upper tooth and upper lip, and between the user's lower tooth and lower lip.In addition, the user's left upper and lower teeth are confined between the left side of the annular curved wall 231 and the first confining wall H17 of the first hollow structure H1, while the user's right upper and lower teeth are confined between the right side of the annular curved wall 231 and the second confining 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 construction, 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 cushioning capabilities for the upper and lower teeth.

[0024] Preferably, the first hollow structure H1 and the second hollow structure H2 can be made of thermosetting silicone rubber or thermoplastic material and have a Shore A hardness in the range between 30 and 90.

[0025] Additionally, as in Fig. As shown in Figure 2B, the first hollow structure H1 has a first opening H1p from the top view of the pressure relief nozzle 2, 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.

[0026] 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 support height H ranging between 3 mm and 20 mm for the user's upper and lower teeth can be achieved. Preferably, the width W of each opening is between 6 mm and 10 mm, and the thickness T of each upper wall and each lower wall is between 1.5 mm and 3 mm. With this configuration, the support height H for the user's upper and lower teeth can reach 7.5 mm to 13 mm.

[0027] Each of the first hollow structure H1 and the second hollow structure H2 may have a rounded U-shape, a square U-shape or a V-shaped cross-section. Fig. Figure 2B illustrates that each of the first hollow structure H1 and the second hollow structure H2 has a square U-shaped cross section. In another embodiment, as shown in Fig. 2C, each of the first hollow structure H1 and the second hollow structure H2 of the pressure relief nozzle 2c has a V-shaped cross section. In a further embodiment, as shown in Fig. 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-shaped cross section.

[0028] Based on the protruding 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 and lower teeth, allowing the user's mouth to remain slightly open in a natural state, thereby achieving the effect of stably holding the mouthpiece without causing fatigue to the muscles near the user's mouth. When the user wants to intermittently hold the mouthpiece harder and move the upper and lower teeth closer together, there is no hindrance due to the presence of the gap.In other words, this structure elastically allows the upper and lower walls to be proximal to each other and distal to each other, while maintaining a gap in their original state that can abut against the user's upper and lower teeth. Therefore, the user can often keep their mouth slightly open and relaxed.

[0029] In addition, in order 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 include 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 are connected to the first upper wall H11 and the first lower wall H13. Similarly, the second hollow structure H2 of the pressure relief mouthpiece 3a may include 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.

[0030] In another embodiment, as in Fig. 3B, the first reinforced device R1 of the first hollow structure H1 of the pressure relief nozzle 3b may also include at least one first longitudinal rib 33. Each first longitudinal rib 33 is arranged 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 arranged on the first upper wall H11 and the first lower wall H13, respectively. Similarly, the second reinforced device R2 of the second hollow structure H2 of the pressure relief nozzle 3b may also include at least one second longitudinal rib 34. Each second longitudinal rib 34 is arranged between the second upper wall H21 and the second lower wall H23 of the second hollow structure H2.

[0031] In a further embodiment, as in Fig. 3C, the first reinforced device R1 of the first hollow structure H1 of the pressure relief nozzle 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. Similarly, the second reinforced device R2 of the second hollow structure H2 of the pressure relief nozzle 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.

[0032] 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 another embodiment, the first hollow structure H1 and the second hollow structure H2 may be manufactured as independent parts and may be fixedly or detachably coupled to the left and right sides of the annular curved wall 231, respectively, such as the one shown in Fig. 3D shown pressure relief mouthpiece 3d.

[0033] Additionally, in one embodiment, as 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 (only one side is shown for illustrative purposes). Preferably, the groove structure G1 is formed with a plurality of parallel narrow grooves having a continuous convex-concave shaped cross-section. This construction increases the possibility that the first hollow structure H1 and the second hollow structure H2 are proximal to or distal from each other. In other words, this construction increases the lateral (i.e., left-right) range of motion of the annular curved wall 231.Thus, since the annular curved wall 231 has more freedom to expand outward and contract inward when the user holds the mouthpiece, it can be adjusted to a more correct and comfortable position according to the different distances between the left and right rows of teeth to suit more users with teeth of different shapes or sizes.

[0034] 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 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).

[0035] Additionally, in one embodiment, as in Fig. As shown in Figure 3F, the pressure relief mouthpiece 3f may include a multi-folded structure MF1 integrally formed between the first connecting portion 21 and the second connecting portion 23. The multi-folded structure MF1 may increase the bending freedom of the second connecting portion 23 with respect to the first connecting portion 21, thereby further reducing the tensile stress caused by the incorrect mouthpiece position, making it more comfortable to use. The multi-folded structure MF1 may be made of thermosetting silicone rubber or thermoplastic material with a Shore A hardness in the range of 20 to 70.

[0036] Similarly, the multiply folded structure MF1 may also comprise at least one continuous zigzag cross-section S1 (as 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).

[0037] Additionally, in one embodiment, as in Fig. 3G, the pressure relief mouthpiece 3g both the Fig. 3E as well as the groove structure G1 shown in Fig. 3F. This combination could provide maximum bending freedom for the mouthpiece, both in terms of the mouthpiece width and the direction in which the mouthpiece extends.

[0038] In addition to breathing tubes for swimming training and second stage regulators or octopus for scuba diving, the above pressure relief mouthpieces of the present invention can also be used in the two-piece snorkeling equipment (i.e., a breathing tube combined with a diving mask that is not connected to the breathing tube) or even other types of diving masks, such as the one-piece snorkeling equipment with a mouthpiece developed by the inventor of the present invention (i.e., a breathable mask in which the breathing tube and the mask body are connected to each other).

[0039] If a two-piece snorkeling equipment is taken as an example, as in Fig.5, the water sports device 5 includes a mask 51, a breathing tube 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 the eyes and nose of a user. The breathing tube 53 has an upper end portion 53a and a lower end portion 53b opposite the upper end portion 53a. The upper end portion 53a provides air inlet and outlet. A fastening member 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 tube 53.

[0040] The focus of the present invention is on the hollow structures on both sides of the protruding mouthpieces. How other parts are designed or for what type of water sports equipment they are used is not the focus of this invention. Any modifications based on the above core technology of the present invention are intended to be protected. Therefore, the above embodiments are only used to illustrate the implementations of the present invention and 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 achieved by those skilled in the art are considered to be within the scope of the present invention.

Claims

[1] Pressure relief mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) for a water sports equipment (5), comprising: a first connecting portion (21) configured to be connected to the water sports equipment (5); and a second connecting portion (23) configured to be contained by a user's mouth and communicating with the first connecting portion (21); characterized by , that: 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 a left side and a right side thereof, respectively; the first hollow structure (H1) comprises: a first upper wall (H11); a first lower wall (H13) opposite the first upper wall (H11); a first inner wall (H15) connected to the first upper wall (H11) and the first lower wall (H13); and a first boundary wall (H17) arranged upwards and downwards from the first inner wall (H15); the second hollow structure (H2) comprises: a second upper wall (H21); a second lower wall (H23) opposite the second upper wall (H21); a second inner wall (H25) connected to the second upper wall (H21) and the second lower wall (H23); and a second boundary wall (H27) arranged upwards and downwards from the second inner wall (H25); when the second connecting portion (23) is contained by the user's mouth, 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. [2] Pressure relief mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to claim 1, wherein the first hollow structure (H1) has a first opening (H1p) defined by the first upper wall (H11), the first lower wall (H13) and the first inner wall (H15), and the second hollow structure (H2) has a second opening (H2p) defined by the second upper wall (H21), the second lower wall (H23) and the second inner wall (H25). [3] The pressure relief mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to claim 2, wherein each of the first opening (H1p) and the second opening (H2p) has a width ranging between 2.2 mm and 15 mm, and each of the first upper wall (H11), the second upper wall (H21), the first lower wall (H13) and the second lower wall (H23) has a thickness ranging between 0.8 mm and 5 mm. [4] Pressure relief mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to one of claims 1 to 3, wherein each of the first hollow structure and the second hollow structure has a rounded U-shape, a square U-shape or a V-shaped cross section. [5] Pressure relief mouthpiece (3a, 3b, 3c, 55) according to one of claims 1 to 4, wherein the first hollow structure (H1) has a first reinforced device (R1) and the second hollow structure (H2) has a second reinforced device (R2). [6] Pressure relief mouthpiece (3a, 55) according to claim 5, wherein the first reinforced device (R1) comprises at least one first transverse rib (31) arranged between the first upper wall (H11) and the first lower wall (H13) of the first hollow structure (H1), and the second reinforced device (R2) comprises at least one second transverse rib (32) arranged between the second upper wall (H21) and the second lower wall (H23) of the second hollow structure (H2). [7] Pressure relief mouthpiece (3b, 55) according to claim 5, wherein the first reinforced device (R1) comprises at least one first longitudinal rib (33) arranged between the first upper wall (H11) and the first lower wall (H13) of the first hollow structure (H1), and the second reinforced device (R2) comprises at least one second longitudinal rib (34) arranged between the second upper wall (H21) and the second lower wall (H23) of the second hollow structure (H2). [8] Pressure relief mouthpiece (3c, 55) according to claim 5, wherein the first reinforced device (R1) comprises a plurality of first projections (35) arranged between the first upper wall (H11) and the first lower wall (H13) of the first hollow structure (H1), and the second reinforced device (R2) comprises a plurality of second projections (36) arranged between the second upper wall (H21) and the second lower wall (H23) of the second hollow structure (H2). [9] The pressure relief mouthpiece (3d, 55) according to claim 1, wherein each of the first hollow structure (H1) and the second hollow structure (H2) is detachably connected to the left side and the right side of the annular curved wall (231), respectively. [10] The pressure relief mouthpiece (3e, 55) according to any one of claims 1 to 9, wherein each of the left side and the right side of the annular curved wall (231) is formed with a groove structure (G1), thereby increasing a lateral movement range of each of the first hollow structure (H1) and the second hollow structure (H2). [11] Pressure relief mouthpiece (3f, 3g, 55) according to one of claims 1 to 10, further comprising a multi-folded structure (MF1) formed integrally between the first connecting portion (21) and the second connecting portion (23) to increase the bending freedom of the second connecting portion (23) with respect to the first connecting portion (21). [12] Water sports equipment (5), comprising: a mask (51) configured to cover the eyes and nose of a user; and a breathing tube (53) having an upper end portion (53a) and a lower end portion (53b), the upper end portion (53a) providing air inlet and outlet, and a fastening element (53c) being provided between the upper end portion (53a) and the lower end portion (53b) to be connected to the mask (51); characterized by that the water sports device (5) further comprises the pressure relief mouthpiece (55) according to any one of claims 1 to 11, which is provided at the lower end portion (53b) of the breathing tube (53).

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