Tail fin for inflatable surfboard

Abstract

The utility model provides a tail fin for an inflatable surfboard, and belongs to the technical field of inflatable surfboards. Comprising a mounting seat, stable mounting mechanisms are mounted above and in the middle of the mounting seat, and a limiting protection mechanism is mounted on one side edge of the mounting seat. According to the utility model, the stable mounting mechanism is arranged, so that during mounting, a worker can insert the embedding seat below the tail fin main body into the middle preassembling groove of the mounting seat arranged on one side of the bottom of the inflatable surfboard in advance in an aligned manner, and then manually twists the block to enable one of the symmetrical positive and negative screw rods in the mounting seat to rotate; due to the fact that synchronous wheels are fixed to one sides of the two positive and negative screw rods, and the two synchronous wheels are sleeved with synchronous belts, the two positive and negative screw rods can rotate synchronously, and at the moment, two pairs of first screw rod sliding sleeves act on the two positive and negative screw rods respectively can drive a first connecting frame and a first guide rod to move in a guiding mode along a first guide groove; and the first guide rods are inserted into the middle parts of the first alignment slots formed in the two sides of the embedding seat in an alignment manner.

Description

Technical Field

[0001] This utility model relates to the field of inflatable surfboard technology, and in particular to a tail fin for inflatable surfboards. Background Technology

[0002] Surfboards are the equipment used for surfing. The earliest surfboards were about 5 meters long and weighed 50 to 60 kilograms. After World War II, foam boards appeared, and the shape of the boards was also improved. The surfboards used now are 1.5 to 2.7 meters long, about 60 centimeters wide, and 7 to 10 centimeters thick. The boards are light and flat, slightly narrower at both ends, and have a tail fin at the bottom rear for stabilization.

[0003] For example, patent CN217864609U discloses an inflatable surfboard tail fin, including a mounting block. The upper outer surface of the mounting block has a mounting groove. A mounting plate is movably mounted in the middle of the mounting groove. The lower two sides of the mounting plate are fixedly mounted with locking strips. The left and right outer surfaces of the mounting plate are fixedly mounted with fixing plates. The upper two sides of the fixing plates are movably mounted with fixing bolts. The front and rear outer surfaces of the mounting groove have locking slots. A silicone strip is fixedly mounted on the upper outer surface of the mounting block. The tail fin body is fixedly mounted on the upper outer surface of the mounting plate. The tail fin body and the mounting groove are distributed in a through-type manner. The tail fin body is located at the upper end of the mounting block. The mounting groove and the locking slot are connected in a through-type manner.

[0004] The aforementioned tail fin is fixed to the surfboard using bolts and threaded grooves during use. However, the threaded structure is prone to loosening during use, and installation and disassembly require specialized equipment, which is time-consuming and laborious. Therefore, this application provides an inflatable surfboard tail fin to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a tail fin for an inflatable surfboard, which solves the problem that the existing method of fixing the tail fin to the surfboard with bolts and screw grooves has the risk of loosening over time, and the installation and disassembly are time-consuming and labor-intensive.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] An inflatable surfboard tail fin includes a mounting base. A stabilizing mounting mechanism is installed on the upper and middle parts of the mounting base, and a limit protection mechanism is installed on one side of the mounting base. The stabilizing mounting mechanism includes a pre-installation groove and an insert seat. A waterproof mechanism is installed around one side of the insert seat. The insert seat is embedded inside the pre-installation groove, and the top of the insert seat is connected to the tail fin body. First mounting components are installed on both sides of the interior of the mounting base. The first mounting components include two positive and negative lead screws, and a second mounting component is installed on one side of each of the two positive and negative lead screws.

[0008] Optionally, the first mounting assembly includes positive and negative lead screws, which are symmetrically mounted on both sides of the mounting base. A timing pulley is fixed around one end of the two positive and negative lead screws on the same side, and a timing belt is sleeved around the two timing pulleys. A first lead screw sleeve is screwed onto both sides of the middle of each of the two positive and negative lead screws, and a first connecting frame is fixed inside the two first lead screw sleeves. A first guide rod is distributed inside the first connecting frame. A first guide groove is distributed on both sides of the pre-installation groove, and a first alignment slot is provided on both sides of the mounting base.

[0009] Optionally, the first guide rod and the first guide groove are connected by a movable guide connection.

[0010] Optionally, the second mounting assembly includes two first bevel gears, which are respectively fixed to one side of the periphery of two positive and negative lead screws. A second bevel gear meshes with one side of the two first bevel gears, and a transmission lead screw is fixed in the middle of the two second bevel gears. A second lead screw sleeve is screwed onto one side of the two transmission lead screws. A second connecting frame is connected below the second lead screw sleeve, and a guide rod is connected to the end of the second connecting frame. Second guide rods are distributed on the inner side of the second connecting frame. Second guide grooves are distributed on the other two sides of the pre-installation groove, and second alignment slots are provided on the other two sides of the mounting base.

[0011] Optionally, the guide rod and the second connecting frame are connected by a support and guide connection.

[0012] Optionally, the limiting protection mechanism includes a torsion block, which is fixed to the top of one of the positive and negative lead screws. A gear is fixed near the top of the positive and negative lead screw. A sliding protective box is fixed to one side of the mounting base. An external thread is provided around one end of the sliding protective box. A threaded plug is threaded onto the outside of the external thread. A rotating shaft is connected to the middle of one end of the threaded plug. A connecting rod is connected to the middle of the other end of the rotating shaft. A sliding sleeve is connected to the end of the connecting rod. A locking toothed sleeve is fixed to the inner side of the sliding sleeve.

[0013] Optionally, the threaded plug and the external thread provided on one end of the sliding protective box are connected by a threaded installation.

[0014] Optionally, the overall external dimensions of the gear match the internal dimensions of the insert sleeve.

[0015] Optionally, the waterproofing mechanism includes a silicone rubber waterproofing sheet, which is fixed to one side of the mounting base. A sealing gasket is fixed to the bottom periphery of the silicone rubber waterproofing sheet, and a sealing gasket groove is provided around the top of the pre-installed groove in the middle of the mounting base.

[0016] Optionally, the sealing gasket and the sealing gasket groove fit together.

[0017] Compared with the prior art, this utility model has at least the following beneficial effects:

[0018] In the above scheme, by setting up a stable installation mechanism, during installation, personnel can pre-align the mounting base below the tail fin body and insert it into the pre-installed groove in the middle of the mounting base on one side of the bottom of the inflatable surfboard. Then, personnel manually twist the lever to rotate one of the symmetrical positive and negative lead screws in the mounting base. Since there are synchronous pulleys fixed on one side of both positive and negative lead screws, and synchronous belts are sleeved on the outside of the two synchronous pulleys, the two positive and negative lead screws can rotate synchronously. At this time, the two pairs of first lead screw sleeves that interact with the two positive and negative lead screws will guide the first connecting frame and the first guide rod along the first guide groove. The displacement is performed until the first guide rod is aligned and inserted into the middle of the first alignment slots on both sides of the mounting base. It is worth mentioning that since there are first bevel gears on one side of each of the two positive and negative lead screws, the two first bevel gears will drive the second bevel gears and transmission lead screws that mesh on their respective sides to rotate. At this time, the second lead screw sleeve that interacts with the two lead screws can then carry the second connecting bracket and the second guide rod along the guide rod and the second guide groove to be aligned and inserted into the second alignment slots on the other two sides of the mounting base. The installation is portable and requires no other tools.

[0019] By setting a limit protection mechanism, after the forward and reverse screws have rotated, since there is a gear near one end of the forward and reverse screws, the operator can slide the sleeve into the sliding protective box and make the inner inserting tooth sleeve of the sleeve align with the gear. Then, the threaded plug is used to close the thread with the external thread on the periphery of the end of the sliding protective box. Since there is a movable rotating shaft at the connection between the inner side of the threaded plug and the inserting tooth sleeve, the threaded rotation of the threaded plug will not drive the inserting tooth sleeve and the gear. Moreover, the outer sleeve of the inserting tooth sleeve is limited by the sliding protective box, which can indirectly and effectively lock the forward and reverse screws in daily use.

[0020] By setting up a waterproof mechanism, when the tail fin body is installed, the silicone rubber waterproof plate around the mounting base below it can be pressed against the top of the mounting base, and the sealing gasket around the bottom of the silicone rubber waterproof plate can be pressed into the sealing gasket groove above the mounting base. The three work together to effectively protect the corresponding components in the pre-installed groove. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present invention and, together with the specification, further serve to explain the principles of the present invention and enable those skilled in the art to implement and use the present invention.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the tail fin for an inflatable surfboard;

[0023] Figure 2 A schematic diagram of the three-dimensional disassembled structure of the tail fin for an inflatable surfboard;

[0024] Figure 3 Top view of the internal structure of the tail fin mount for an inflatable surfboard;

[0025] Figure 4 Tail fin for inflatable surfboards Figure 3 Schematic diagram of the structure at point B;

[0026] Figure 5 A top-view structural diagram of a tail fin sleeve for an inflatable surfboard;

[0027] Figure 6 Tail fin for inflatable surfboards Figure 2 Schematic diagram of the structure at point A in the middle.

[0028] Figure label:

[0029] 1. Mounting base; 2. Secure mounting mechanism; 21. Pre-installation slot; 22. Insertion seat; 23. Tail fin body; 24. First mounting assembly; 241. Positive and negative lead screws; 242. Synchronous pulley; 243. Synchronous belt; 244. First lead screw sleeve; 245. First connecting bracket; 246. First guide rod; 247. First guide groove; 248. First alignment slot; 25. Second mounting assembly; 251. First bevel gear; 252. Second bevel gear; 253. Transmission lead screw; 254. Second lead screw sleeve; 255. Second connecting bracket; 256. Guide rod; 257. Second guide rod; 258. Second guide groove; 259. Second alignment slot; 3. Limit protection mechanism; 31. Torsion block; 32. Gear; 33. Sliding protective box; 34. External thread; 35. Threaded plug; 36. Rotating shaft; 37. Connecting rod; 38. Sliding sleeve; 39. Inserting gear sleeve; 4. Waterproofing mechanism; 41. Silicone rubber waterproof membrane; 42. Sealing gasket; 43. Sealing gasket groove.

[0030] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiment of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0031] The following is a detailed description of an inflatable surfboard tail fin provided by this utility model, in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0032] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0033] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0034] It is understood that the meanings of “on”, “above”, and “above” in this utility model should be interpreted in the broadest manner, such that “on” not only means “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” not only means “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0035] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0036] like Figures 1 to 5As shown, an embodiment of this utility model provides an inflatable surfboard tail fin, including a mounting base 1. A stabilizing mounting mechanism 2 is installed on the upper and middle parts of the mounting base 1, and a limit protection mechanism 3 is installed on one side of the mounting base 1. The stabilizing mounting mechanism 2 includes a pre-installation groove 21 and an insert 22. A waterproof mechanism 4 is installed around one side of the insert 22. The insert 22 is embedded inside the pre-installation groove 21, and the top of the insert 22 is connected to the tail fin body 23. A first mounting assembly 24 is installed on both sides inside the mounting base 1. The first mounting assembly 24 includes positive and negative lead screws 241, which are symmetrically installed on both sides inside the mounting base 1. Synchronous pulleys 242 are fixed around one end of the same side of the two positive and negative lead screws 241. A timing belt 243 is fitted around the periphery of the two positive and negative lead screws 241. First lead screw sleeves 244 are screwed onto both sides of the middle portion of each of the two lead screw sleeves 244. A first connecting frame 245 is fixed inside the two first lead screw sleeves 244. First guide rods 246 are distributed inside the first connecting frame 245. First guide grooves 247 are distributed on both sides of the pre-installation slot 21. First alignment slots 248 are provided on both sides of the mounting base 22. The first guide rods 246 and the first guide grooves 247 are connected by a movable guide connection. A second mounting assembly 25 is installed on one side of each of the two positive and negative lead screws 241. The second mounting assembly 25 includes two first bevel gears 251, which are respectively fixed to one side of the periphery of the two positive and negative lead screws 241. A second bevel gear 252 meshes with one side of 51, and a transmission screw 253 is fixed in the middle of the two second bevel gears 252. A second screw sleeve 254 is screwed onto one side of the two transmission screws 253. A second connecting frame 255 is connected below the second screw sleeve 254, and a guide rod 256 is connected to the end of the second connecting frame 255. Second guide rods 257 are distributed on the inner side of the second connecting frame 255. Second guide grooves 258 are distributed on the other two sides of the pre-installation groove 21. Second alignment slots 259 are provided on the other two sides of the mounting base 22. The guide rod 256 and the second connecting frame 255 are connected for support and guidance. During installation, the personnel can pre-align and insert the mounting base 22 below the tail fin body 23 into the mounting base provided on one side of the bottom of the inflatable surfboard. In the pre-installed slot 21 in the middle of the mounting base 1, the operator manually twists the lever 31 to rotate one of the symmetrical positive and negative lead screws 241 in the mounting base 1. Since both positive and negative lead screws 241 are fixed with synchronous pulleys 242 on one side, and synchronous belts 243 are sleeved on the outside of the two synchronous pulleys 242, the two positive and negative lead screws 241 can rotate synchronously. At this time, the two pairs of first lead screw sleeves 244 acting on the two positive and negative lead screws 241 respectively will carry the first connecting bracket 245 and the first guide rod 246 to move along the first guide groove 247 until the first guide rod 246 is aligned and inserted into the middle of the first alignment slots 248 on both sides of the mounting base 22. It is worth mentioning that since a first bevel gear 251 is provided around one side of each of the two positive and negative lead screws 241,Therefore, the two first bevel gears 251 will drive the second bevel gears 252 and the transmission screws 253, which are meshing on their respective sides, to rotate. At this time, the second screw sleeves 254, which interact with the two screws, can then guide the second connecting bracket 255 and the second guide rod 257 along the guide rod 256 and the second guide groove 258 to be inserted into the second alignment slots 259 on both sides of the mounting base 22. The installation is convenient and portable, requiring no other tools.

[0037] The limiting protection mechanism 3 includes a torsion block 31, which is fixed to the top of one of the positive and negative lead screws 241. A gear 32 is fixed near the top of the positive and negative lead screws 241. A sliding protective box 33 is fixed to one side of the mounting base 1. An external thread 34 is provided around one end of the sliding protective box 33. A threaded plug 35 is threaded onto the outside of the external thread 34. The threaded plug 35 and the external thread 34 on one end of the sliding protective box 33 are connected by a threaded connection. A rotating shaft 36 is connected to the middle of one end of the threaded plug 35. A connecting rod 37 is connected to the middle of the other end of the rotating shaft 36. A sliding sleeve 38 is connected to the end of the connecting rod 37. A locking toothed sleeve 39 is fixed inside the sliding sleeve 38. The gear 32 is externally connected to the locking toothed sleeve 39. The internal dimensions of 9 are matched. After the positive and negative lead screw 241 has rotated, since there is a gear 32 near one end of the positive and negative lead screw 241, the operator can slide the sleeve 38 into the sliding protective box 33 and make the inner side of the sleeve 38, the toothed sleeve 39, be aligned and embedded in the periphery of the gear 32. Then, the threaded plug 35 is used to close the thread with the external thread 34 provided at the periphery of the end of the sliding protective box 33. Since there is a movable rotating shaft 36 at the connection between the inner side of the threaded plug 35 and the toothed sleeve 39, the threaded plug 35 will not drive the toothed sleeve 39 and the gear 32 when it rotates. Moreover, the outer sleeve 38 of the toothed sleeve 39 is limited by the sliding protective box 33, which can indirectly and effectively lock the positive and negative lead screw 241 in daily use.

[0038] like Figure 2 and Figure 6 As shown, the waterproof mechanism 4 includes a silicone rubber waterproof sheet 41, which is fixed to one side of the mounting base 22. A sealing gasket 42 is fixed to the bottom periphery of the silicone rubber waterproof sheet 41. A sealing gasket groove 43 is provided around the top of the pre-installation groove 21 in the middle of the mounting base 1. The sealing gasket 42 and the sealing gasket groove 43 fit together. When the tail fin body 23 is installed, the silicone rubber waterproof sheet 41 provided around the mounting base 22 below it can be pressed against the top of the mounting base 1. The sealing gasket 42 provided around the bottom periphery of the silicone rubber waterproof sheet 41 can be pressed into the sealing gasket groove 43 provided above the mounting base 1. The three of them work together to effectively protect the corresponding components in the pre-installation groove 21.

[0039] The working principle of the technical solution provided by this utility model is as follows:

[0040] During installation, the operator can pre-align the mounting base 22 below the tail fin body 23 into the pre-installed groove 21 in the middle of the mounting base 1 on one side of the bottom of the inflatable surfboard. Then, the operator manually twists the lever 31 to rotate one of the symmetrical positive and negative lead screws 241 inside the mounting base 1. Since both positive and negative lead screws 241 are fixed with synchronous pulleys 242 on one side, and synchronous belts 243 are sleeved on the outside of the two synchronous pulleys 242, the two positive and negative lead screws 241 can rotate synchronously. At this time, the two pairs of first lead screw sleeves 244 acting on the two positive and negative lead screws 241 respectively will carry the first connecting frame 245 and the first guide rod 246 along... The first guide rod 246 is guided by the first guide groove 247 to move until it is aligned and inserted into the middle of the first alignment slots 248 on both sides of the mounting base 22. It is worth mentioning that since there are first bevel gears 251 on one side of each of the two positive and negative lead screws 241, the two first bevel gears 251 will rotate the second bevel gears 252 and the transmission lead screws 253 that are meshed on their respective sides. At this time, the second lead screw sleeve 254, which interacts with the two lead screws, can then guide the second connecting bracket 255 and the second guide rod 257 to be aligned and inserted along the guide rod 256 and the second guide groove 258. The second alignment slots 259 on both sides of the mounting base 22 can be used for installation. This is convenient and requires no additional tools. After the lead screw 241 has rotated, a gear 32 is located near one end of the lead screw 241. At this point, the operator can slide the sleeve 38 into the sliding housing 33, ensuring that the inner inserting gear sleeve 39 of the sleeve 38 is aligned and embedded around the gear 32. Then, the threaded plug 35 is threaded closed with the external thread 34 on the periphery of the sliding housing 33. Because a movable rotating shaft 36 is located at the connection point between the threaded plug 35 and the inserting gear sleeve 39, The threaded plug 35 will not drive the insert sleeve 39 and gear 32 when the thread rotates. The outer sliding sleeve 38 of the insert sleeve 39 has a sliding protective box 33 for limiting, which can indirectly and effectively lock the forward and reverse screws 241 in daily use. Finally, when the tail fin body 23 is installed, the silicone rubber waterproof plate 41 provided around the mounting seat 22 below it can be pressed against the top of the mounting seat 1. The sealing gasket 42 provided around the bottom of the silicone rubber waterproof plate 41 can be pressed into the sealing gasket groove 43 provided above the mounting seat 1. The three of them work together to effectively protect the corresponding components in the pre-installed groove 21.

[0041] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A tail fin for an inflatable surfboard, characterized in that, The device includes a mounting base, a stabilizing mounting mechanism installed on the top and middle of the mounting base, and a limit protection mechanism installed on one side of the mounting base. The stabilizing mounting mechanism includes a pre-installation groove and an insert seat, and a waterproof mechanism is installed around one side of the insert seat. The insert seat is embedded inside the pre-installation groove, and the top of the insert seat is connected to the tail fin body. A first mounting assembly is installed on both sides inside the mounting base. The first mounting assembly includes two positive and negative lead screws, and a second mounting assembly is installed on one side of each of the two positive and negative lead screws.

2. The inflatable surfboard tail fin according to claim 1, characterized in that, The first mounting assembly includes positive and negative lead screws, which are symmetrically mounted on both sides of the mounting base. A timing pulley is fixed around one end of the two positive and negative lead screws on the same side, and a timing belt is sleeved around the two timing pulleys. A first lead screw sleeve is screwed onto both sides of the middle of each of the two positive and negative lead screws, and a first connecting frame is fixed inside the two first lead screw sleeves. A first guide rod is distributed inside the first connecting frame. A first guide groove is distributed on both sides of the pre-installation groove, and a first alignment slot is provided on both sides of the mounting base.

3. The inflatable surfboard tail fin according to claim 2, characterized in that, The first guide rod and the first guide groove are connected by a movable guide.

4. The inflatable surfboard tail fin according to claim 1, characterized in that, The second mounting assembly includes two first bevel gears, which are respectively fixed to one side of two positive and negative lead screws. A second bevel gear meshes with one side of the two first bevel gears, and a transmission lead screw is fixed in the middle of the two second bevel gears. A second lead screw sleeve is screwed onto one side of the two transmission lead screws. A second connecting frame is connected below the second lead screw sleeve, and a guide rod is connected to the end of the second connecting frame. Second guide rods are distributed on the inner side of the second connecting frame. Second guide grooves are distributed on the other two sides of the pre-installation groove, and second alignment slots are provided on the other two sides of the mounting base.

5. The inflatable surfboard tail fin according to claim 4, characterized in that, The guide rod and the second connecting frame are connected by a support and guide connection.

6. The inflatable surfboard tail fin according to claim 1, characterized in that, The limiting protection mechanism includes a torsion block, which is fixed to the top of one of the positive and negative lead screws. A gear is fixed near the top of the positive and negative lead screw. A sliding protective box is fixed to one side of the mounting base. An external thread is provided around one end of the sliding protective box. A threaded plug is threaded onto the outside of the external thread. A rotating shaft is connected to the middle of one end of the threaded plug. A connecting rod is connected to the middle of the other end of the rotating shaft. A sliding sleeve is connected to the end of the connecting rod. A locking toothed sleeve is fixed to the inner side of the sliding sleeve.

7. The inflatable surfboard tail fin according to claim 6, characterized in that, The threaded sleeve is threadedly connected to the external thread on one end of the sliding protective box.

8. The inflatable surfboard tail fin according to claim 6, characterized in that, The external dimensions of the gear as a whole match the internal dimensions of the insert sleeve.

9. The inflatable surfboard tail fin according to claim 1, characterized in that, The waterproofing mechanism includes a silicone rubber waterproofing sheet, which is fixed to one side of the mounting base. A sealing gasket is fixed to the bottom periphery of the silicone rubber waterproofing sheet, and a sealing gasket groove is provided around the top of the pre-installed groove in the middle of the mounting base.

10. The inflatable surfboard tail fin according to claim 9, characterized in that, The sealing gasket and the sealing gasket groove fit together.

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