PRESSURE LIMITER MOUTHPIECE AND WATER SPORTS EQUIPMENT INCLUDING SAME

Abstract

PRESSURE LIMITER MOUTHPIECE AND WATER SPORTS EQUIPMENT COMPRISING SAME A pressure limiting mouthpiece (2) for water sports equipment comprises a connecting portion (23) held by a user's mouth and having an annular curved wall (231) with first and second hollow structures (H1, H2) formed on its left and right sides, respectively. Each hollow structure (H1, H2) comprises an upper wall (H11, H21), a lower wall (H13, H23), an inner wall (H15, H25) connecting the upper wall and the lower wall, and a limiting wall (H17, H27) disposed upward and downward from the inner wall. When the connecting portion is held by the user's mouth, a portion of the user's teeth are configured to contact the upper wall and the lower wall of each hollow structure.Figure to be published with the abstract: Figure 2A.

Description

Title of the invention: PRESSURE LIMITER MOUTHPIECE AND WATER SPORTS EQUIPMENT COMPRISING THE SAME BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present invention relates to a pressure limiting mouthpiece for water sports equipment used, for example, for swimming training, snorkeling, scuba diving or other water activities (including both surface and underwater activities). 2. Description of the associated state of the art

[0002] Nowadays, there are a wide variety of water sports equipment available, for example, swimming goggles for swimmers, masks for snorkeling, and oxygen supply equipment for self-contained breathing apparatus diving. Among them, many pieces of equipment need to be equipped with mouthpieces, such as breathing tubes for swimming training, breathing tubes of two-piece snorkeling masks, and even additional second stages or second-stage regulators for self-contained breathing apparatus 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. Furthermore, [Fig.[lB] shows a two-part breathing tube 102 of a snorkeling mask, in which a mouthpiece M2 is provided at the lower end portion thereof as well.

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

[0004] However, in practice, the most comfortable situation for the user holding the mouthpiece is where the upper and lower jaws (i.e. i.e., the upper and lower rows of teeth) are in a relaxed state with a small gap between them. This situation makes it possible to perform 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, which will impair the enjoyment of snorkeling. Therefore, existing improvements still do not meet practical needs, because snorkelers do not hold the mouthpiece very hard most of the time during activities, and therefore, improvements to the tooth-contacting surfaces of a mouthpiece have very limited effectiveness. As shown in [Fig.lD], in order to solve the above problem, some manufacturers have incorporated a B1 bridge into the M4 mouthpiece.When the user releases their mouth to bite, the B1 bridge can still support the user's palate, preventing the mouthpiece from falling. However, this design causes discomfort to the soft tissues of the user's palate and creates a noticeable foreign body sensation in the mouth.

[0005] Under these conditions, improving the structure of the mouthpiece to solve all or part of the above-mentioned problems has become the objective of the industry in research and development. Summary of the invention

[0006] The main objective of the present invention is to provide a limiting mouthpiece pressure device for water sports equipment, wherein each of the left and right side walls 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, such that the upper row of teeth and the lower row of teeth of the user can elastically abut against the upper wall and the lower wall, respectively, thereby allowing the upper and lower rows of teeth of the user to have room to be proximal or distal to each other, and well supporting the user's mouth to be in a natural slightly open state. This allows the user to hold the mouthpiece stably and durably.

[0007] To achieve the above-mentioned objective, the present invention relates to a pressure limiting mouthpiece for water sports equipment. The pressure limiting mouthpiece comprises a first connecting portion which is configured to be connected to the water sports equipment, and a second connecting portion which is configured to be held by the mouth of a user and which is 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 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 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 held 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] According to one example, the first hollow structure has a first opening defined by the first top wall, the first bottom wall, and the first inner wall, and the second hollow structure has a second opening defined by the second top wall, the second bottom wall, and the second inner wall.

[0009] According to any one of the above examples, each of the first opening and the second opening has a width of 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 of between 0.8 mm and 5 mm.

[0010] According to any one of the above examples, each of the first hollow structure and the second hollow structure has a rounded U-shaped, wedged U-shaped, or V-shaped cross-section.

[0011] According to any one of the above examples, the first hollow structure has a first reinforced device and the second hollow structure has a second reinforced device.

[0012] According to one example, 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.

[0013] According to one example, 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.

[0014] According to one example, 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.

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

[0016] According to any 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, allowing an increase in a lateral movement range of each of the first hollow structure and the second hollow structure.

[0017] According to any one of the above examples, the pressure limiting mouthpiece further comprises a multi-fold structure integrally formed between the first connecting portion and the second connecting portion so as to increase a bending freedom of the second connecting portion relative to the first connecting portion.

[0018] Furthermore, based on the same objective as above, the present invention relates to water sports equipment comprising a mask, a breathing tube, and a pressure-limiting mouthpiece according to 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 has an air inlet and an air outlet. A clip is provided between the upper end portion and the lower end portion for connecting to the mask. The pressure-limiting mouthpiece is located at the lower end portion of the breathing tube. Brief description of the drawings

[0019] [Fig. 1 A] is a schematic perspective view of a user wearing a hose classic breathing for swimming training.

[0020] [Fig. IB] is a schematic perspective view of a mouthpiece for the conventional breathing tube.

[0021] [Fig. IC] 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.

[0022] [Fig. 1D] is a schematic perspective view of yet another conventional mouthpiece, in which a bridge is provided to bear on the user's upper jaw.

[0023] [Fig.2A] is a schematic perspective view of a pressure limiting mouthpiece according to one 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-limiting mouthpiece are rectangular U-shaped.

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

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

[0027] [Fig.3A] is a schematic perspective view of a pressure limiting mouthpiece according to one embodiment of the present invention, wherein 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 limiting 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 limiting mouthpiece according to yet another embodiment, wherein the reinforced device disposed between the upper wall and the lower wall of the hollow structure is a plurality of projections.

[0030] [Fig.3D] is a schematic perspective view of a pressure limiting 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 limiting 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 limiting mouthpiece according to yet another embodiment, showing that a multi-ply structure is formed between the first connecting portion and the second connecting portion.

[0033] [Fig.3G] is a schematic perspective view of a pressure limiting mouthpiece according to yet another embodiment, which shows the groove structures and the multi-fold structure.

[0034] [Fig.4A] illustrates an exemplary variation of the multi-ply structure of the present invention.

[0035] [Fig.4B] illustrates another exemplary variation of the multi-ply structure of the present invention.

[0036] [Fig.4C] illustrates yet another exemplary variation of the multi-ply structure of the present invention.

[0037] [Fig.5] is a schematic perspective view illustrating a user wearing water sports equipment according to the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENT

[0038] It should be noted that the following description of the embodiments is intended only to explain the contents of the present invention, but not to limit the invention. Elements not directly related to the present invention are omitted from the description, and the dimensions as illustrated for all elements in the drawings are intended only to facilitate understanding and are not intended to limit their actual scales. Furthermore, the adjectives used "upper", "lower", "front", "rear", "left", "right", "inner", "outer" or similar adjectives defined in the descriptions are designated relative to the direction of the user himself. These are only relative relationships and not limiting.When the names of elements imply "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.

[0039] As shown in [Fig.2A], the present invention relates to a pressure limiting mouthpiece 2 which can be used for water sports equipment, such as a mouthpiece-type breathing tube for snorkeling or any water sports equipment provided with a mouthpiece.

[0040] The pressure limiting mouthpiece 2 comprises 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 held by the mouth of a user and is in communication with the first connecting portion 21.

[0041] 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 comprises 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 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 comprises a second upper wall H21, a second lower wall H23 opposite 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.

[0042] When the second connecting portion 23 is held 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 received between the upper gums and the upper lip of the user, as well as between the lower gums and the lower lip of the user.Furthermore, the upper and lower left 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 upper and lower right rows 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 positioning the entire pressure limiting mouthpiece 2 in the user's mouth. In this design, two gaps 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.

[0043] Preferably, the first hollow structure H1 and the second hollow structure H2 may be made of thermosetting silicone rubber or thermoplastic plastic, and have a Shore A hardness of between 30 and 90.

[0044] Furthermore, as shown in [Fig.2B], in a top view of the pressure limiting 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.

[0045] Each of the first opening H1p and the second opening H2p preferably has a width W of 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 of between 0.8 mm and 5 mm. In this way, a support height H of between 3 mm and 20 mm can be obtained for the upper and lower rows of teeth of the user. 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 upper and lower rows of teeth of the user can reach 7.5 mm to 13 mm.

[0046] Each of the first hollow structure H1 and the second hollow structure H2 may have a rounded U-shaped, wedged U-shaped, or V-shaped cross-section. [Fig. 2B] illustrates that each of the first hollow structure H1 and the second hollow structure H2 has a wedged 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 limiting mouthpiece 2c has a V-shaped cross-section. In yet another embodiment, as shown in [Fig. 2D], each of the first hollow structure H1 and the second hollow structure H2 of the pressure limiting mouthpiece 2c has a rounded U-shaped cross-section.

[0047] Based on the aforementioned 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's mouth to remain slightly open in a natural state, thereby stably holding the mouthpiece without causing fatigue to the muscles near the user's mouth. Furthermore, when the user intermittently wishes to hold the mouthpiece harder and bring 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 and distal to each other, while maintaining a distance to their original state that can . come into contact with the user's upper and lower rows of teeth. Therefore, the user can often keep their mouth slightly open and relaxed.

[0048] Furthermore, to permanently maintain the distance between the upper wall and the lower wall and prevent them from collapsing, a reinforced device may 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 limiting mouthpiece 3a may comprise a first reinforced device RI comprising 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, for example, 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 limiting mouthpiece 3a may comprise a second reinforced device R2 comprising 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.

[0049] In another embodiment, as shown in [Fig.3B], the first reinforced device RI of the first hollow structure H1 of the pressure limiting mouthpiece 3b may also comprise 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. Similarly, the second reinforced device R2 of the second hollow structure H2 of the pressure limiting mouthpiece 3b may also comprise 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.

[0050] In yet another embodiment, as shown in [Fig.3C], the first reinforced device RI of the first hollow structure H1 of the pressure limiting mouthpiece 3c may also comprise 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 limiting mouthpiece 3c comprises 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.

[0051] 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 as independent pieces and respectively fixedly or removably coupled to the left and right sides of the annular curved wall 231, such as the pressure limiting mouthpiece 3d illustrated in [Fig.3D].

[0052] Furthermore, in one embodiment, as shown in [Fig. 3E], the pressure limiting mouthpiece 3e may be formed with a groove structure G1 on the left and right sides of the annular curved wall 231 (for illustration purposes, only one side is shown). Preferably, the groove structure G1 is formed with a plurality of parallel narrow grooves having a continuous convex-concave cross-section. This design increases the possibility of the first hollow structure H1 and the second hollow structure H2 being proximal or distal to each other. In other words, this design increases the lateral (i.e., left-right) range of movement 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 adapted to a more correct and comfortable position according to the different distances between the left and right rows of teeth, so as to suit a greater number of users whose mouths have different shapes or sizes.

[0053] 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]).

[0054] Furthermore, in one embodiment, as shown in [Fig.3F], the pressure limiting mouthpiece 3f may have a multi-ply structure MF1 integrally formed between the first connecting portion 21 and the second connecting portion 23. The multi-ply structure MF1 may increase the bending freedom of the second connecting portion 23 relative to the first connecting portion 21, thereby further reducing the tensile load caused by an incorrect position of the mouthpiece, making it more convenient to use. The multi-ply structure MF1 may be made of thermosetting silicone rubber or thermoplastic plastic having a Shore A hardness of 20 to 70.

[0055] Similarly, the multi-fold 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 cross-section S3 (as shown in [Fig.4C]).

[0056] Further, in one embodiment, as shown in [Fig. 3G], the pressure limiting mouthpiece 3g may incorporate both the groove structure G1 shown in [Fig. 3E] and the multi-fold structure MF1 shown in [Fig. 3F]. This combination could provide maximum flexural freedom for the mouthpiece, both in terms of holding width or the direction in which the mouthpiece extends.

[0057] In addition to breathing tubes for swimming training and additional second stages or second stage regulators for self-contained breathing apparatus diving, the pressure-limiting mouthpieces according to the present invention can also be used in two-piece snorkeling equipment (i.e., a breathing tube in combination with a diving mask that is not in communication with the breathing tube), or even other types of diving masks, such as one-piece snorkeling equipment with a mouthpiece developed by the inventor of the present invention (i.e., a breathing mask in which the breathing tube and the mask body are in communication with each other).

[0058] Taking a two-piece snorkeling equipment as shown in [Fig. 5] as an example, the water sports equipment 5 comprises a mask 51, a breathing tube 53, and a pressure-limiting mouthpiece 55 as described in any of the above examples or embodiments (i.e., the pressure-limiting 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 has an air inlet and an air outlet. A clip 53c is disposed between the upper end portion 53a and the lower end portion 53b for being connected to the mask 51.The pressure limiting mouthpiece 55 is located at the lower end portion 53b of the breathing tube 53. .

[0059] The subject matter of the present invention is based on the hollow structures located on each side of the aforementioned mouthpieces. The design of the other parts or the type of water sports equipment for which it is used are not the subject matter of the present invention. All modifications based on the aforementioned basic technology of the present invention are within the scope of the present invention. Therefore, 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 present invention. All modifications or equivalent arrangements that can be easily carried out by those skilled in the art fall within the scope of the present invention.

Claims

1. Claims Pressure limiting mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) for water sports equipment (5), comprising: a first connecting part (21), which is configured to be connected to the water sports equipment (5); and a second connecting portion (23), which is configured to be held by a user's mouth and which is in communication with the first connecting portion (21); characterized by the fact that: the second connecting part (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 (Hl) comprises: - a first upper wall (Hl 1); - a first lower wall (H 13) opposite the first upper wall (H 11); - a first inner wall (H 15) connecting the first upper wall (H 1 1) and the first lower wall (H 13); and - a first limiting wall (H 17) arranged upwards and downwards from the first inner wall (H 15); 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) connecting the second upper wall (H21) and the second lower wall (H23); and - a second limiting wall (H27) arranged upwards and downwards from the second inner wall (H25); when the second connecting portion (23) is held 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 limiting mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to claim 1, characterized in that the first hollow structure (Hl) has a first opening (Hlp) defined by the first upper wall (Hl 1), 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. Pressure limiting mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to claim 2, characterized in that each of the first opening (Hlp) and the second opening (H2p) has a width of between 2.2 mm and 15 mm, and each of the first upper wall (Hl 1), the second upper wall (H21), the first lower wall (H 13) and the second lower wall (H23) has a thickness of between 0.8 mm and 5 mm.

4. Pressure limiting mouthpiece (2, 2c, 2d, 3a, 3b, 3c, 3d, 3e, 3f, 3g, 55) according to any one of claims 1 to 3, characterized in that each of the first hollow structure (H1) and the second hollow structure (H2) has a rounded U-shaped, cornered U-shaped or V-shaped cross-section.

5. Pressure limiting mouthpiece (3a, 3b, 3c, 55) according to any one of claims 1 to 4, characterized in that the first hollow structure (H1) has a first reinforced device (RI) and the second hollow structure (H2) has a second reinforced device (R2).

6. Pressure limiting end piece (3a, 55) according to claim 5, characterized in that the first reinforced device (RI) comprises at least one first transverse rib (31) arranged between the first upper wall (H1 1) 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 limiting mouthpiece (3b, 55) according to claim 5, characterized in that the first reinforced device (RI) comprises at least one first longitudinal rib (33) arranged between the first upper wall (H1 1) 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 limiting mouthpiece (3c, 55) according to claim 5, characterized in that the first reinforced device (RI) comprises a plurality of first projections (35) arranged between the first upper wall (H1 1) 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. A pressure limiting mouthpiece (3d, 55) according to claim 1, characterized in that each of the first hollow structure (H1) and the second hollow structure (H2) is removably connected to the left side and the right side of the annular curved wall (231), respectively.

10. A pressure limiting mouthpiece (3e, 55) according to any one of claims 1 to 9, characterized in that each of the left side and the right side of the annular curved wall (231) is formed with a groove structure (Gl), allowing an increase in a lateral movement range of each of the first hollow structure (Hl) and the second hollow structure (H2).

11. Pressure limiting mouthpiece (3f, 3g, 55) according to any one of claims 1 to 10, characterized in that it further comprises a multi-fold structure (MF1) formed in one piece between the first connecting part (21) and the second connecting part (23) so as to increase a freedom of bending of the second connecting part (23) relative to the first connecting part (21).

12. Water sports equipment (5) comprising: a mask (51), which is 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) having an air inlet and an air outlet, and a clip (53c) being provided between the upper end portion (53a) and the lower end portion (53b) for connecting to the mask (51); characterized in that the water sports equipment (5) further comprises a pressure limiting mouthpiece (55) according to any one of claims 1 to 11, located at the lower end portion (53b) of the breathing tube (53).

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