Surfboard with anti-drag balance fins

Abstract

The utility model relates to the technical field of water sports equipment, and discloses a surfboard with an anti-drag balance fin, the surfboard comprises a board body, a fin seat is fixedly connected to the position, close to the rear end, of the lower surface of the board body, a fin is installed on the inner wall of the fin seat through a connecting mechanism, and the fin comprises a main body part and an edge part. Through the streamline design of the fin base and the unique flow guide cavity and turbulent flow protrusion structures in the fin base, water flow can be effectively guided, the impact direction of the water flow is changed, and resistance of the water flow to the surfboard is reduced. Meanwhile, due to the special shapes of the fins, such as thickness gradual change and edge smooth curved surface treatment, the water resistance generated when the surfboard moves in water is further reduced, the whole surfboard slides in the water more smoothly and faster, a surf can move forwards more easily with the help of the force of sea waves, and the surfing experience is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water sports equipment, in particular to a surfboard with a drag-reducing balance fin. BACKGROUND

[0002] Surfing is increasingly popular, and the performance of a surfboard, as the key equipment for surfing, directly affects the experience of a surfer and the controllability on the waves. Although the traditional surfboard can meet the basic surfing requirements, there are still some deficiencies in actual use. For example, the surfboard is subjected to relatively large resistance when moving forward in water, which affects the sliding speed. Moreover, the fin base and fin of many surfboards are connected in a complex manner, and when a surfer wants to replace the fin according to different wave conditions, personal balance feeling and other factors, it is found that the fin base and fin are extremely difficult to disassemble, and professional tools are often needed, a lot of time and effort are consumed, and great inconvenience is brought to the user. Therefore, the surfboard with the drag-reducing balance fin is provided to solve the above problems. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the problem that the surfboard is subjected to relatively large resistance when moving forward in water, which affects the sliding speed, the application provides a surfboard with a drag-reducing balance fin.

[0004] The surfboard with the drag-reducing balance fin provided by the application adopts the following technical scheme:

[0005] The surfboard with the drag-reducing balance fin comprises a board body, a fin base fixedly connected to the lower surface of the board body near the rear end, and a fin installed on the inner wall of the fin base through a connecting mechanism. The fin comprises a main body part and an edge part. The main body part is a thin plate structure with an arc-shaped contour, and its thickness gradually thins from one end connected to the fin base to the other end. The edge part is arranged around the outer periphery of the main body part, and the thickness of the edge part is smaller than that of the main body part. The outer surface of the edge part is a smooth curved surface. A plurality of lightening holes are formed in the main body part, are uniformly distributed and penetrate through the thickness direction of the main body part, and the edges of the lightening holes are rounded.

[0006] The fin base is in a streamlined shape, and its top end is smoothly and transitionally connected to the lower surface of the board body. A plurality of hollow flow guide cavities are arranged in the fin base. The inner wall of each flow guide cavity is provided with a plurality of disturbance flow protrusions, and the disturbance flow protrusions are helically distributed along the inner wall of the flow guide cavity.

[0007] Preferably, a positioning groove is formed in the outer wall of the bottom of the fin base, a connecting block is fixedly connected to the top end of the fin, the connecting block is inserted into the positioning groove in a matched mode, and a clamping groove is symmetrically formed in the outer wall of each side of the connecting block.

[0008] Preferably, the connecting mechanism comprises two movable grooves opened in the fin base, the two movable grooves are symmetrically arranged, the inner wall of the movable groove is slidably connected with a movable block, the movable block is fixedly connected with a clamping block on the side wall of the connecting block, the clamping block extends into the inner part of the positioning groove, and the clamping block is clamped with the clamping groove.

[0009] Preferably, a spring is further installed in the movable groove, one end of the spring is fixedly connected with the outer wall of the movable block, and the other end of the spring is fixedly connected with the inner wall of the movable groove.

[0010] Preferably, two avoiding grooves are opened in the bottom outer wall of the fin base, the two avoiding grooves are communicated with the two movable grooves, the inner wall of the avoiding groove is slidably connected with a movable column, one end of the movable column is fixedly connected with the movable block, and the other end of the movable column is fixedly connected with a pushing block.

[0011] To sum up, the application has the following beneficial technical effects:

[0012] 1. Through the streamlined design of the fin base and the unique flow guide cavity and the spoiler structure in the fin base, the water flow can be effectively guided, the water flow impact direction can be changed, and the water flow resistance to the surfboard can be reduced. At the same time, the special shape of the fin itself, such as the gradually changing thickness and the smooth curved edge treatment, further reduces the water resistance when moving in the water, so that the surfboard slides more smoothly in the water, the speed is faster, and the surfer can more easily move forward with the power of the sea waves, improving the surfing experience.

[0013] 2. Through the connecting mechanism, the fin base and the fin can be quickly disassembled and assembled, so that the surfer can conveniently replace different types of fins according to the actual wave conditions and the demand for balance, so as to change the balance performance of the surfboard. Whether it is a beginner or an experienced surfer, they can better adapt to different environments. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the overall schematic view of the application embodiment;

[0015] Figure 2 is the bottom perspective view of the application embodiment;

[0016] Figure 3 is the first partial cross-sectional view of the fin base in the application embodiment;

[0017] Figure 4 is the three-dimensional structure view of the fin base and the fin in the application embodiment;

[0018] Figure 5 is the second partial cross-sectional view of the fin base in the application embodiment.

[0019] Explanation of reference signs: 1, board body; 2, fin base; 3, fin; 4, edge part; 5, main body part; 6, weight-reducing hole; 7, flow guide cavity; 8, interference flow protrusion; 9, positioning groove; 10, connecting block; 11, movable slot; 12, movable block; 13, clamping block; 14, spring; 15, avoiding slot; 16, movable column; 17, pushing block; 18, clamping slot. DETAILED DESCRIPTION

[0020] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The present application is further described in detail.

[0021] The embodiment of the present application discloses a surfboard with a drag-reducing balance fin. Figures 1-5 The surfboard with a drag-reducing balance fin comprises a board body 1, a fin base 2 fixedly connected to the lower surface of the board body 1 near the rear end, and a fin 3 installed on the inner wall of the fin base 2 through a connecting mechanism. The fin 3 comprises a main body part 5 and an edge part 4. The main body part 5 is a thin plate structure with an arc-shaped contour, and its thickness gradually decreases from one end connected to the fin base 2 to the other end. The edge part 4 is arranged around the outer periphery of the main body part 5, and the thickness of the edge part 4 is smaller than that of the main body part 5. The outer surface of the edge part 4 is a smooth curved surface. A plurality of weight-reducing holes 6 are formed on the main body part 5. The weight-reducing holes 6 are uniformly distributed and penetrate through the thickness direction of the main body part 5. The edges of the weight-reducing holes 6 are chamfered to reduce the weight of the fin 3 while avoiding stress concentration.

[0022] The fin base 2 is streamlined, and its top end is smoothly and transitionally connected to the lower surface of the board body 1. A plurality of hollow flow guide cavities 7 are arranged in the fin base 2. The inner wall of the flow guide cavities 7 is provided with a plurality of interference flow protrusions 8, which are helically distributed along the inner wall of the flow guide cavities 7.

[0023] A positioning groove 9 is formed on the outer wall of the bottom of the fin base 2. The top end of the fin 3 is fixedly connected to a connecting block 10. The connecting block 10 is inserted into the positioning groove 9 in a matched manner. Clamping slots 18 are symmetrically formed on the outer walls of the two sides of the connecting block 10.

[0024] The connecting mechanism comprises two movable slots 11 formed in the inner part of the fin base 2. The two movable slots 11 are symmetrically arranged. A movable block 12 is slidably connected to the inner wall of the movable slot 11. A clamping block 13 is fixedly connected to the outer wall of one side of the movable block 12, which extends into the inner part of the positioning groove 9 and is clamped with the clamping slot 18.

[0025] A spring 14 is further installed in the inner part of the movable slot 11. One end of the spring 14 is fixedly connected to the outer wall of the movable block 12, and the other end is fixedly connected to the inner wall of the movable slot 11.

[0026] The bottom outer wall of the fin seat 2 is provided with two avoiding grooves 15, which are communicated with the two movable grooves 11 correspondingly, the inner wall of the avoiding groove 15 is slidably connected with a movable column 16, one end of the movable column 16 is fixedly connected with the movable block 12, and the other end of the movable column 16 is fixedly connected with a pushing block 17.

[0027] The implementation principle of the surfboard with the drag-reducing balance fin is as follows: when the surfboard is produced and manufactured, first, the prepared streamlined fin seat 2 is installed on the lower surface of the board body 1 near the rear end of the surfboard at a preset position by a suitable fixing mode such as glue, so as to ensure that the fin seat 2 is connected with the lower surface of the board body 1 firmly and smoothly.

[0028] During the process that the connecting block 10 enters the positioning groove 9, the connecting mechanism in the fin seat 2 is automatically triggered to lock the connecting block 10 in the positioning groove 9, so that the fin 3 is fixed on the fin seat 2, specifically: when the connecting block 10 enters the inside of the positioning groove 9, the outer wall of the connecting block 10 extrudes the two clamping blocks 13 in the inside of the positioning groove 9, the end portions of the two clamping blocks 13 are upwardly inclined, so that the connecting block 10 can easily extrude the two clamping blocks 13 outward, the two clamping blocks 13 push the two movable blocks 12 outward in the movable grooves 11, the movable blocks 12 extrude the springs 14 in cooperation with the inner walls of the movable grooves 11, the springs 14 generate elastic force by deformation, when the connecting block 10 completely enters the inside of the positioning groove 9, the clamping grooves 18 on the two sides of the outer wall of the connecting block 10 are aligned with the two clamping blocks 13, at this time, the connecting block 10 no longer extrudes the two clamping blocks 13, the movable blocks 12 are reset under the action of the elastic force of the springs 14, the movable blocks 12 drive the clamping blocks 13 to be clamped with the clamping grooves 18, so that the connecting block 10 is locked in the positioning groove 9, the installation of the drag-reducing balance fin is completed, and then the complete surfboard is assembled.

[0029] When the surfer carries the surfboard of the surfboard into the water to surf, the water flow first contacts the fin seat 2 in the process that the surfboard slides forward, due to the streamlined design of the fin seat 2 and the effects of the multiple flow guide cavities 7 and the interference flow protrusions 8 in the fin seat 2, the water flow can flow along the flow guide cavities 7 more smoothly, the original disordered water flow state is changed, the resistance to the entire surfboard is reduced, and meanwhile, the spiral distribution of the interference flow protrusions 8 further optimizes the water flow direction, so that the impact force of the water flow on the fin seat 2 is reduced.

[0030] And, the surfer can feel the balance on the wave, and conveniently dismount and reinstall the fin base 2 of different types through the connecting mechanism after landing on the shore, to fine-tune the balance effect, to adapt to different wave conditions and personal skill levels, specifically: manually dial two dial blocks 17, make two dial blocks 17 away from each other, dial block 17 drives two movable blocks 12 away from each other through movable column 16, and then movable block 12 drives clamping block 13 to disengage from the clamping groove 18, thereby releasing the locking of the connecting block 10, and the fin 3 together with the connecting block 10 is pulled out of the positioning groove 9 to complete the dismounting work, and when installing, the same reason according to the above operation of inserting the connecting block 10 into the positioning groove 9 can complete the fixation.

[0031] Finally, a few points should be noted: first, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0032] Secondly: the utility model discloses the embodiment of the drawings, only relate to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, under the condition of no conflict, the same embodiment and different embodiments of the utility model can be combined with each other;

[0033] Finally: the above only for the preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement, improvement etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

[0034] The above are the preferred embodiments of the present application, and are not limited to the protection scope of the present application, therefore: any equivalent change made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A surfboard with drag-reducing balance fins, comprising a board body (1), characterized in that: The lower surface of the plate body (1) is fixedly connected with a fin seat (2) near the rear end, the inner wall of the fin seat (2) is installed with a fin (3) through a connecting mechanism, the fin (3) comprises a main body part (5) and an edge part (4), the main body part (5) is a thin plate structure with an arc profile, the thickness thereof gradually thins from one end connected with the fin seat (2) to the other end, the edge part (4) is arranged around the outer periphery of the main body part (5), and the thickness of the edge part (4) is smaller than that of the main body part (5), the outer surface of the edge part (4) is a smooth curved surface, and a plurality of lightening holes (6) are formed in the main body part (5), the lightening holes (6) are uniformly distributed and penetrate through the thickness direction of the main body part (5), and the edges of the lightening holes (6) are chamfered. The fin seat (2) is streamlined, the top end thereof is smoothly and transitionally connected with the lower surface of the plate body (1), a plurality of hollow flow guide cavities (7) are arranged in the fin seat (2), and the inner wall of the flow guide cavity (7) is provided with a plurality of disturbance flow protrusions (8) which are helically distributed along the inner wall of the flow guide cavity (7).

2. A surfboard with a drag-reducing balance fin as claimed in claim 1, characterized in that: A positioning groove (9) is formed in the bottom outer wall of the fin seat (2), the top end of the fin (3) is fixedly connected with a connecting block (10), the connecting block (10) is inserted into the positioning groove (9) in a matched mode, and a clamping groove (18) is symmetrically formed in the outer wall of the connecting block (10) on both sides.

3. A surfboard with a drag-reducing balance fin as claimed in claim 2, characterised in that: The connecting mechanism comprises two movable grooves (11) formed in the interior of the fin seat (2), the two movable grooves (11) are symmetrically arranged, the inner wall of the movable groove (11) is slidably connected with a movable block (12), the outer wall of one side of the movable block (12) towards the connecting block (10) is fixedly connected with a clamping block (13), one end of the clamping block (13) away from the movable groove (11) extends into the interior of the positioning groove (9) and is clamped with the clamping groove (18).

4. A surfboard with a drag-reducing balance fin as claimed in claim 3, characterised in that: A spring (14) is further arranged in the interior of the movable groove (11), one end of the spring (14) is fixedly connected with the outer wall of the movable block (12), and the other end thereof is fixedly connected with the inner wall of the movable groove (11).

5. A surfboard with a drag-reducing balance fin as claimed in claim 4, characterised in that: Two avoiding grooves (15) are formed in the bottom outer wall of the fin seat (2), the two avoiding grooves (15) are communicated with the two movable grooves (11) in a corresponding mode, the inner wall of the avoiding groove (15) is slidably connected with a movable column (16), one end of the movable column (16) is fixedly connected with the movable block (12), and the other end thereof is fixedly connected with a pushing block (17).

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