An inflatable stand-up paddleboard and method having dual buoyant beams

Abstract

This invention discloses an inflatable standing paddleboard with dual buoyancy beams and a method thereof. The paddleboard includes a main air chamber formed internally, with an inflation valve for the main air chamber on its top surface and an independent air chamber at its tail. Each independent air chamber has its own inflation valve. Inflatable buoyancy beams extending along the length of the paddleboard are arranged on the left and right sides of the water-contacting surface. The tail end of each inflatable buoyancy beam is connected to the interior of the independent air chamber. Board-face antagonistic fabrics are arranged on the left and right sides of the top surface of the paddleboard, with two board-face antagonistic fabrics corresponding vertically to the two inflatable buoyancy beams. The buoyancy beams and the independent air chambers form an independent system, providing backup buoyancy even when the main air chamber leaks. The buoyancy beams on both sides form longitudinal reinforcing beams, significantly improving bending and torsional resistance and increasing anti-overturning moment. The board-face antagonistic fabrics and the bottom buoyancy beams form a bidirectional antagonistic structure, balancing the upper and lower bending resistance. Combined with double-sided central carbon fiber PVC reinforcement, the structure is simplified and the effect is significant.

Description

Technical Field

[0001] This invention relates to an inflatable standing paddleboard and method, and more particularly to an inflatable standing paddleboard with a double buoyancy beam. Background Technology

[0002] Current inflatable stand-up paddleboards typically achieve buoyancy and rigidity by increasing the board's thickness and width. Common racing or cruise paddleboards on the market are mostly 5 or 6 inches thick. While a thicker board provides a larger air chamber volume and load-bearing capacity, it also results in a higher center of gravity, greater wind resistance, insufficient water-skimming feel, and less direct handling feedback. For racing and advanced users, current products are not well-suited to their needs.

[0003] There are attempts within the industry to reduce the board thickness to 4 inches, 4.5 inches, or other thinner thicknesses. While this lowers the center of gravity and improves foot feel during exercise, it also leads to reduced buoyancy, bending stiffness, and torsional resistance. For example, reducing the thickness of a 14-foot x 26-inch racing paddleboard from 5 inches to 4.5 inches, without considering theoretical nose and tail taper and corner rounding, results in a volume reduction of approximately 35L. Considering the actual effective coefficient of the board shape, the effective buoyancy loss could be around 20L to 30L.

[0004] Existing improvement solutions include widening the board, increasing its thickness, using higher-density brushed fabric, and adding lateral attachments. However, widening the board would reduce racing efficiency, increasing the thickness would raise the center of gravity, and adding lateral attachments would significantly change the appearance and water resistance, and would also make storage more difficult.

[0005] Therefore, there is a need for a paddleboard that can improve buoyancy, stability and rigidity without significantly increasing the overall width of the board. Summary of the Invention

[0006] To address the shortcomings of the aforementioned technologies, this invention provides an inflatable standing paddleboard with dual buoyancy beams and a method thereof.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: an inflatable standing paddleboard with double buoyancy beams, comprising a plate body forming a main air chamber inside, a main air chamber inflation valve for inflating and deflating the main air chamber is provided on the top surface of the plate body, an independent air chamber independent of the main air chamber is provided at the tail of the plate body, the independent air chamber is implemented by having an independent inflation valve, inflatable buoyancy beams extending along the length of the plate body are respectively provided on the left and right sides of the water-contacting surface of the plate body, the tail end of each inflatable buoyancy beam is connected to the interior of the independent air chamber, and plate surface anti-resistance cloth is respectively provided on the left and right sides of the top surface of the plate body, the two plate surface anti-resistance cloths are respectively arranged vertically and vertically corresponding to the two inflatable buoyancy beams.

[0008] Furthermore, the planar profile of the inflatable buoyancy beam is a long teardrop shape. The front and rear ends of the inflatable buoyancy beam gradually narrow, and the width in the middle is greater than the width at both ends. The cross-section of the inflatable buoyancy beam is an arc shape that bulges away from the water surface of the plate. The two inflatable buoyancy beams are symmetrically arranged about the longitudinal centerline of the plate. Each inflatable buoyancy beam is set close to the edge of the plate on the corresponding side. The front end of the inflatable buoyancy beam extends towards the head of the plate, and its rear end extends towards the tail of the plate and terminates in the area where the independent air chamber is located. The outer surface of each inflatable buoyancy beam is equipped with carbon fiber wear-resistant strips, which are attached to the bottom outer surface of the inflatable buoyancy beam in a manner that extends along the length of the inflatable buoyancy beam.

[0009] Furthermore, the anti-flange fabric is shaped like a willow leaf and extends along the length of the board. The anti-flange fabric is attached to the PVC layer on the top surface of the board, and the two anti-flange fabrics are located directly above the inflatable buoyancy beam on the corresponding side.

[0010] Furthermore, carbon fiber PVC is provided in the center of both the top surface and the water-contacting surface of the board. The carbon fiber PVC extends along the length of the board and is in the shape of a strip. The carbon fiber PVC is located between the two anti-corrosion cloths on the board surface.

[0011] Furthermore, the top surface of the board is equipped with standing friction texture, which is located in the middle and rear area of ​​the board and is formed by covering the standing and stepping area with a fish scale pattern; a foot pad is provided behind the standing friction texture, which is located behind the independent air chamber and has a top surface and an inclined surface that is inclined towards the front of the board.

[0012] Furthermore, the tail area of ​​the plate's water-contacting surface is equipped with a tail fin base on which the tail fin is mounted, and the tail fin is formed in a downward-extending manner.

[0013] Furthermore, the front end of the plate is provided with a detachable flow guide head, the rear edge of the plate is provided with a tail flow guide and drag reduction strip, and the outer edge of the plate is surrounded by a edging cloth.

[0014] A method for an inflatable standing paddleboard with double buoyancy beams involves cutting out the shape of an independent air chamber corresponding to the rear area of ​​the fabric of the board. The independent air chamber and the main air chamber of the board are airtightly isolated by a double-layer fabric strip structure. The double-layer fabric strip structure is formed by high-frequency heat sealing two fabric strips along their central length. The two fabric strips form a heat-sealed band in the middle, and movable adhesive wings are formed on both sides of the heat-sealed band. The two adhesive wings on one side are respectively bonded to the top surface and the water-contacting surface of the cut-out area of ​​the independent air chamber of the board, and the two adhesive wings on the other side are respectively bonded to the top surface and the water-contacting surface of the fabric of the independent air chamber. Thus, the two fabric strips together form a double-layer sealing structure. Straight-grained PVC base fabric is bonded to the left and right sides of the water-contacting surface of the board. The straight stripes of the straight-grained PVC base fabric extend in the same direction as its length. Each straight-grained PVC base fabric is also covered and bonded with a larger twill PVC surface fabric. The edge of the twill PVC surface fabric is bonded and sealed to the edge of the straight-grained PVC base fabric, forming an inflatable buoyancy beam bladder between the two. The twill-cut surface fabric has greater deformation and toughness when inflated to adapt to the expansion deformation of the arc section of the inflatable buoyancy beam. The straight-grained PVC base fabric has matching air holes at the corresponding positions of the independent air chambers and forms a connecting air channel, so that the air buoyancy beams on both sides can be inflated and expanded synchronously when the independent air chambers are inflated. During sealing, the independent air chambers are sealed first, and then the outer perimeter of the main air chamber of the plate is sealed with the surrounding fabric.

[0015] Furthermore, a twill-cut sealing strip is also bonded around the bonding position between the twill PVC outer fabric and the straight-grained PVC base fabric to further enhance the sealing performance of the edge of the inflatable buoyancy beam body; after attaching a carbon fiber wear-resistant strip extending along its length to the bottom of the outer surface of each inflatable buoyancy beam, a layer of wrapping cloth is then used to cover the entire outer surface of the inflatable buoyancy beam, and the edge of the wrapping cloth is sealed and fixed to the water-contacting surface of the plate by a sealing strip.

[0016] Furthermore, the ratio of the drawing height of the sheet metal to the width of the fabric strip is 1:1.2 to 1:1.8; The width of the heat-sealing strip in the middle of the double-layered fabric strip is 70% to 80% of the total width of the double-layered fabric strip, and the width of the adhesive flanges on both sides is equal and symmetrically distributed on both sides of the heat-sealing strip.

[0017] An inflatable standing paddleboard with dual buoyancy beams and its method are disclosed. Two inflatable buoyancy beams at the bottom of the board are connected to an independent air chamber at the tail, forming a complete independent air chamber system. Even if the main air chamber leaks, the independent air chamber and the two inflatable buoyancy beams can maintain air pressure to provide backup buoyancy, completely eliminating the safety hazard of traditional single-chamber paddleboards losing buoyancy completely in the event of air leakage. The two inflatable buoyancy beams extending along the length are equivalent to two longitudinal reinforcing beams, significantly improving the longitudinal bending stiffness and torsional performance of the board without significantly increasing the board width. Simultaneously, the arrangement of the inflatable buoyancy beams on both sides away from the centerline generates a greater anti-rollover moment, effectively improving the lateral stability of the narrow board. The two anti-bending fabrics on the board surface correspond vertically to the two inflatable buoyancy beams at the bottom, forming a bidirectional bending structure similar to antagonistic muscles through the top tension layer and the bottom inflatable beams. This balances the bending capacity of the upper and lower sides of the board, avoiding the problem of relative weakening of the upper side of the board due to increased stiffness at the bottom. Combined with the longitudinal reinforcement of double-sided central carbon fiber PVC, the structure is simplified and the effect is significant. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the present invention. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0020] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 .

[0021] Figure 4 This is a schematic diagram of the foot pad structure.

[0022] Figure 5 Schematic diagram of the paddleboard rigidity test site Figure 1 .

[0023] Figure 6 This is a schematic diagram of the paddle rigidity test field for the present invention. Figure 2 .

[0024] Figure 7 This is a schematic diagram of the horizontal line recording of the paddle rigidity test height according to the present invention.

[0025] Figure 8 This is a schematic diagram of the loading process recording for the paddle rigidity test of the present invention.

[0026] In the image: 1. Detachable air deflector head; 2. Carbon fiber PVC; 3. Air deflector surface anti-reflective fabric; 4. Camera mounting base; 5. Standing friction texture; 6. Center handle; 7. Edge fabric; 8. Independent air chamber; 9. Foot pad; 10. Main air chamber inflation valve; 11. Rear handle; 12. Inflatable buoyancy beam; 13. Tail fin base; 14. Tail fin; 15. Tail air deflector and drag reduction strip; 16. Sloping surface; 17. Top surface. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-4As shown in the figure, this embodiment relates to an inflatable stand-up paddleboard with double buoyancy beams. The paddleboard body is made of PVC fabric, and a main air chamber is formed inside the body. A main air chamber inflation valve 10 is provided on the top surface of the paddleboard body for inflating and deflating the main air chamber. After inflation, the paddleboard body maintains a flat shape and possesses sufficient load-bearing rigidity under the tension of the PVC fabric. The PVC fabric is a prior art material, consisting of two layers of PVC film connected by a large number of vertically arranged polyester fiber lines. After inflation, the fiber lines are straightened, thus limiting the thickness of the paddleboard body and maintaining its planar shape. This is a commonly used material for inflatable stand-up paddleboards. For example, the outer edge of the board is surrounded by a edging cloth 7, which is arranged along the entire outer contour of the board to seal the edge and enhance the wear resistance of the side. The front end of the board is provided with a detachable guide plate head 1. The detachable guide plate head 1 is designed to be removed and installed at the very front of the board to guide the flow and improve the speed attribute of the paddleboard. The tail edge of the board is provided with a tail guide drag reduction strip 15, which is commonly referred to in the field as a rob, to improve the water flow separation state at the tail of the board, reduce water flow viscous drag and tail drag, thereby improving the paddleboard paddling efficiency.

[0029] An independent air chamber 8 is located at the tail of the board. This independent air chamber 8 is airtightly separated from the main air chamber and operates independently. The independent air chamber 8 also employs a fabric-like structure to ensure structural stability after inflation. Each independent air chamber 8 is equipped with an independent inflation valve, allowing for individual inflation and deflation. The independent air chamber 8 and the main air chamber of the board are airtightly isolated by a double-layered fabric strip structure. This double-layered fabric strip structure is formed by high-frequency heat sealing two fabric strips along their central length. The two fabric strips form a heat-sealed band in the middle, and movable adhesive wings are formed on both sides of the heat-sealed band. Two adhesive wings on one side are respectively bonded to the top surface of the cut area of ​​the independent air chamber and the water-contacting surface, while two adhesive wings on the other side are respectively bonded to the top surface of the fabric-like structure of the independent air chamber 8. The two fabric strips together form a double-layer sealing structure, which is connected to the water surface. The ratio of the drawing height of the fabric to the width of the fabric strip is 1:1.2 to 1:1.8. The width of the heat-sealed band in the middle of the double fabric strip is 70% to 80% of the total width of the fabric strip. The width of the adhesive wing edges on both sides is equal and symmetrically distributed on both sides of the heat-sealed band. The working pressure of the main air chamber can be selected from 12 PSI to 25 PSI, and can also exceed this range according to actual conditions. The working pressure of the independent air chamber and the inflatable buoyancy beam 12 can be between 3 PSI and 20 PSI. The independent air chamber scheme allows the main air chamber to retain auxiliary buoyancy and edge support even when it loses pressure, which is fundamentally different from the risk of complete loss of buoyancy in the case of leakage in traditional single-chamber paddleboards.

[0030] Inflatable buoyancy beams 12 extending along the length of the board are respectively arranged on the left and right sides of the water-contacting surface. The inner end of each inflatable buoyancy beam 12 is connected to the interior of an independent air chamber 8, so that the two inflatable buoyancy beams 12 and the independent air chamber 8 together form a complete independent air chamber system. The inflatable buoyancy beams 12 are formed by bonding straight-weave PVC base fabric and twill-weave PVC surface fabric. The straight-weave PVC base fabric is attached to the water-contacting surface of the board, and its straight stripes extend in the same direction as the length of the inflatable buoyancy beam 12. The twill-weave PVC surface fabric covers and is bonded to the outside of the straight-weave PVC base fabric and is sealed to the edge of the straight-weave PVC base fabric. The two form an inflatable bladder chamber. The twill-cut surface fabric has greater deformation and toughness when inflated to adapt to the air-contacting process. The inflatable buoyancy beam 12 expands and deforms with an arc cross section; the straight-grained PVC base fabric has matching inflation holes at the corresponding positions of the independent air chambers 8 and the corresponding positions of the independent air chambers 8, forming a connecting air passage, so that the inflatable buoyancy beams 12 on both sides inflate and expand synchronously when the independent air chambers 8 are inflated; a ring of diagonally cut sealing strips is also glued around the edge of the inflatable buoyancy beam 12 to further enhance the edge sealing performance; the formed independent air chamber system is completely airtightly separated from the main air chamber of the plate and can be independently inflated and deflated through the inflation valve on the independent air chamber 8; when the main air chamber leaks accidentally and the air pressure drops, the independent air chambers 8 and the two inflatable buoyancy beams 12 can still maintain air pressure, providing backup buoyancy for the paddleboard, so that the paddleboard can still keep the user floating even in the air leakage state.

[0031] The inflatable buoyancy beam 12 has a long teardrop shape in plan view, also known as a sharksword shape. Its front end gradually widens, reaching its maximum width in the middle or rear section, and then gradually narrows again at the rear end. The front and rear ends of the inflatable buoyancy beam 12 use small rounded ends or blunted tips, with a minimum end width of 5mm to 30mm, preferably 10mm to 20mm, to reduce stress concentration during production and the risk of end wear. The length of the inflatable buoyancy beam 12 can be 40% to 80% of the total length of the paddleboard, preferably 50% to 75%. In the actual application of racing paddleboards, a single inflatable buoyancy beam... The length of the air buoyancy beam 12 is approximately 2500 mm to 2850 mm, and the length of the sample embodiment is approximately 2566 mm. The two air buoyancy beams 12 are symmetrically arranged about the longitudinal centerline of the plate. Each air buoyancy beam 12 is located close to the edge of the plate on the corresponding side. The distance between the outer edge of the air buoyancy beam 12 and the edge strip can be 30 mm to 90 mm, preferably 40 mm to 60 mm. The distance between the centerline of the air buoyancy beam 12 and the longitudinal centerline of the plate is approximately 180 mm to 240 mm, preferably 200 mm to 225 mm.

[0032] The cross-section of the inflatable buoyancy beam 12 is an arc shape that bulges away from the water surface of the plate. The maximum width of the cross-section can be 60mm to 220mm, preferably 90mm to 170mm; the maximum height of the cross-section can be 15mm to 90mm, preferably 30mm to 70mm.

[0033] One of the actual production samples has an inflatable buoyancy beam 12 with a maximum width of approximately 130mm, a maximum height of approximately 50mm, an arc angle of approximately 150°, and an arc radius of approximately 67.3mm. The arc angle can be selected within the range of 90° to 180°. A smaller arc angle is suitable for the low-drag racing version, while a larger arc angle is suitable for the high-buoyancy and high-stability version.

[0034] Each inflatable buoyancy beam 12 forms an inflatable cavity, with a single beam volume ranging from 2L to 25L. For a 14-foot × 26-inch × 4.5-inch racing paddleboard, the volume of a single inflatable buoyancy beam 12 is preferably 8L to 11L, with a total buoyancy of approximately 16L to 22L on both sides. The current sample design has a single beam volume of approximately 8.6L to 10.2L. Assuming the paddleboard thickness is reduced from the original 5-inch to 4.5-inch, and without considering the theoretical narrowing of the nose and tail and corner rounding corrections, the board volume is reduced by approximately 35L. Considering the effective coefficient of the actual board shape, the effective buoyancy loss is approximately 20L. The additional buoyancy of 16L to 22L provided by the double-sided inflatable buoyancy beams 12 can compensate for most of the buoyancy loss caused by the reduction in thickness, allowing the thin racing board to still have good load-bearing capacity and safety margin.

[0035] In actual production, local reinforcing plates can be added to the transition areas at the front and rear ends of the inflatable buoyancy beam 12 to reduce the risk of delamination and wear. Each inflatable buoyancy beam 12 has carbon fiber wear-resistant strips extending along its length on the bottom of its outer surface. These strips are attached to the bottom outer surface of the inflatable buoyancy beam 12 to enhance the wear and scratch resistance of the bottom of the buoyancy beam, resist friction from sand and gravel on land and collisions with underwater foreign objects, and extend the service life of the buoyancy beam. Each inflatable buoyancy beam 12 is also covered with a layer of wrapping cloth, which covers the entire outer surface of the inflatable buoyancy beam 12. The edge of the wrapping cloth is sealed and fixed to the water-contacting surface of the plate with a sealing strip. The wrapping cloth can form an integral outer layer of protection for the inflatable buoyancy beam 12 and the carbon fiber wear-resistant strips at its bottom, further improving its wear resistance, scratch resistance, and UV aging resistance.

[0036] Two inflatable buoyancy beams 12 are arranged longitudinally along both sides of the bottom of the plate, equivalent to two longitudinal reinforcing beams, effectively enhancing the longitudinal bending rigidity and torsional performance of the plate. The applicant conducted a double-support bending test on the sample of this design. The test sample specifications were 426cm in length, 66cm in width, and 12.7cm in thickness. The main body inflation pressure was 20PSI, and the buoyancy beam inflation pressure was 10PSI. During the test, support points were set at both ends of the paddleboard, with a span of 2m. The loaded item was placed in the middle position between the two support points, and the loaded weight was... The weight was 75kg. The sinking amount at the midpoint of the paddleboard was tested with and without the buoyancy beams installed. It can be clearly seen that under the same paddleboard specifications, same support span, same main air pressure and same load weight, the sinking amount in this embodiment is significantly reduced. At the same time, since the two inflatable buoyancy beams 12 are arranged far from the center line, the additional buoyancy can generate a larger anti-rollover moment, which significantly improves the lateral stability of the narrow racing board. When the same additional volume is placed on both sides, its anti-rollover moment is much greater than that of the additional buoyancy placed near the center line.

[0037] Based on this, such as Figure 5 and Figure 6 Test site photos, Figure 7 High horizontal line record and Figure 8 As shown in the loading test record, the above test was conducted on July 24, 2026, at approximately 37.3169°N, 122.1154°E. During the test, supports were set at both ends of the sample plate and a concentrated load was applied to the middle. The amount of sinking deformation of the plate was recorded by the height horizontal line, and the entire loading process was photographed and recorded. The test results directly verify the enhancement effect of the bottom double buoyancy beam structure on the longitudinal rigidity of the plate. The bottom buoyancy beam can not only increase buoyancy and stability, but also significantly improve the overall rigidity of the inflatable paddleboard under load, which has a very positive effect on racing thin paddleboards.

[0038] Two anti-bending fabrics 3 are respectively installed on the left and right sides of the top surface of the board. The two anti-bending fabrics 3 are arranged vertically and vertically corresponding to the two inflatable buoyancy beams 12. The anti-bending fabrics 3 are made of straight-weave strips, are willow-leaf shaped and extend along the length of the board. The anti-bending fabrics 3 are attached to the PVC layer on the top surface of the board. The two anti-bending fabrics 3 are located directly above the corresponding inflatable buoyancy beams 12. Because the two inflatable buoyancy beams 12 at the bottom will enhance the bending resistance of the bottom of the board after inflation, the neutral axis of the board will shift downward and the surface of the board will be affected. The side bending resistance is relatively insufficient, which can easily lead to the problem of weak strength on the pressure side of the board. The anti-bending cloth 3 on the board surface provides tension at the top of the board, forming a top reinforcement structure that is anti-resistant to the bottom inflatable buoyancy beam 12. Its mechanism is similar to the antagonistic muscles in human muscles. While the bottom inflatable buoyancy beam 12 provides lower side bending support, the top board surface anti-bending cloth 3 provides upper side tension. The two work together to balance the bending resistance of the upper and lower sides of the board, making the bending performance of the board more balanced in the entire thickness direction and further improving the overall rigidity.

[0039] Carbon fiber PVC2 is provided on the top surface and the center of the water-contacting surface of the board. The carbon fiber PVC2 extends along the length of the board and is in the shape of a strip. The carbon fiber PVC2 is located between the two anti-corrosion cloths 3 on the two sides of the board. The carbon fiber PVC2 on both sides forms a central reinforcing strip that runs through the head to the tail of the board, further enhancing the longitudinal rigidity of the board and preventing the board from bending and deforming in the middle during use.

[0040] The top surface of the board is provided with standing friction texture 5, which is located in the middle and rear area of ​​the board and is covered with a fish scale pattern in the standing and stepping area. The standing friction texture 5 provides users with a non-slip standing area, ensuring that there is still sufficient friction between the feet and the board surface when there is water, so as to avoid slipping. The front end of the board with standing friction texture 5 is provided with a handle, the central area is provided with a central handle 6, and the rear end of the board is provided with a rear handle 11, which facilitates the carrying and transfer of the paddleboard. A camera mounting base 4 is provided in front of the standing friction texture 5. The camera mounting base 4 is used to install shooting equipment such as action cameras to record the paddling process.

[0041] A foot pad 9 is provided behind the standing friction texture 5. The foot pad 9 is located behind the independent air chamber 8. The foot pad 9 has a top surface 17 and an inclined surface 16 that is inclined towards the front of the board. The foot pad 9 is used to prevent the user's heel from sliding backward, which plays a limiting role and allows the user to maintain a stable standing position during paddling, avoiding excessive backward movement of the heel and affecting balance and power. The inclined surface 16 is inclined towards the front of the board and can naturally conform to the contour of the back of the heel, so the limiting effect is comfortable and reliable.

[0042] A tail fin base 13 is provided at the tail of the water-contacting area of ​​the board, and a tail fin 14 is installed on the tail fin base 13. The tail fin 14 extends downward and extends along the longitudinal direction of the board to maintain the straight-line stability of the paddleboard during paddling, reduce lateral deviation, and improve paddling efficiency.

[0043] The method for manufacturing an inflatable standing paddleboard with double buoyancy beams according to this embodiment is as follows:

[0044] First, the fabric of the board is cut into the shape of the board body. Then, the shape area corresponding to the independent air chamber 8 is cut out from the rear area of ​​the fabric of the board body, thus forming the fabric blank used for the independent air chamber 8. Then, two identical fabric strips are used and the two fabric strips are high-frequency heat-sealed along the middle length direction, so that the two fabric strips form a heat-sealed band in the middle and movable adhesive wings are formed on both sides of the heat-sealed band. Then, the heat-sealed double fabric strips are arranged around the outer periphery of the independent air chamber 8 and between the cut edge of the board body. The two adhesive wings on one side are respectively bonded to the top surface and the water-contacting surface of the cut edge of the independent air chamber of the board body, and the two adhesive wings on the other side are respectively bonded to the top surface and the water-contacting surface of the fabric of the independent air chamber 8. Thus, the two fabric strips together form a double-layer sealing structure to achieve airtight isolation between the independent air chamber 8 and the main air chamber. When sealing, the independent air chamber 8 is sealed first, and then the outer periphery of the main air chamber of the board body is sealed by the edge cloth 7.

[0045] Next, the inflatable buoyancy beam 12 is manufactured. First, a willow-leaf shaped straight-grained PVC base fabric is cut and bonded to the corresponding position on the water-contacting surface of the board. The straight grain of the PVC base fabric extends in the same direction as its length to obtain stronger tensile strength and smaller deformation. Then, a larger twill-grained PVC surface fabric is covered and bonded to the surface of the straight-grained PVC base fabric. The edge of the twill-grained PVC surface fabric is bonded and sealed to the edge of the straight-grained PVC base fabric, forming an inflatable bladder between the two. The twill-grained surface fabric has greater deformation and toughness when inflated, which can adapt to the expansion deformation of the arc cross section of the inflatable buoyancy beam 12. Matching inflation holes are made at the positions of the straight-grained PVC base fabric corresponding to the independent air chamber 8 and at the corresponding positions of the independent air chamber 8, forming a connecting air passage so that the inflatable buoyancy beams 12 on both sides can inflate and expand synchronously when the independent air chamber 8 is inflated. To further improve the sealing performance, a twill-grained sealing strip is bonded around the bonding position of the two PVC fabrics of the inflatable buoyancy beam 12.

[0046] After the buoyancy beam capsule is made, a carbon fiber wear-resistant strip extending along its length is attached to the bottom of the outer surface of each inflatable buoyancy beam 12. Then, a layer of wrapping cloth is used to cover the entire outer surface of the inflatable buoyancy beam 12. The edge of the wrapping cloth is sealed and fixed to the water-contacting surface of the plate by a sealing strip, thereby completing the overall encapsulation of the inflatable buoyancy beam 12.

[0047] The anti-buoyancy cloth 3 is made of straight-grained strips cut into willow leaf shape and is attached to the corresponding positions of the two inflatable buoyancy beams 12 on the top and bottom of the board. Carbon fiber PVC2 is attached to the center of the top surface and the water-contacting surface of the board to form a double-sided central longitudinal reinforcement strip. Then, standing friction texture 5, camera mounting base 4, central handle 6 and rear handle 11 are attached to the corresponding positions on the top surface of the board. Foot pad 9 is attached to the rear of the independent air chamber 8. Tail fin base 13 and tail fin 14 are installed at the tail of the board on the water-contacting surface. Detachable guide plate head 1 is installed at the front of the board. Tail guide drag reduction strip 15 is attached to the tail edge of the board. Finally, edge banding cloth 7 is attached around the outer edge of the board to complete the overall edge sealing, thus obtaining the finished paddleboard.

[0048] This application discloses an inflatable standing paddleboard with dual buoyancy beams and a method thereof. Two inflatable buoyancy beams 12 at the bottom of the board are connected to an independent air chamber 8 at the tail, forming a complete independent air chamber system. Even if the main air chamber leaks, the independent air chamber 8 and the two inflatable buoyancy beams 12 can still maintain air pressure to provide backup buoyancy, completely eliminating the safety hazard of complete loss of buoyancy in the event of a leak in traditional single-chamber paddleboards. The two inflatable buoyancy beams 12 extending along the length direction are equivalent to two longitudinal reinforcing beams, significantly improving the longitudinal bending stiffness of the board without significantly increasing the board width. The design enhances the lateral stability and torsional strength of the narrow board. The arrangement of the two inflatable buoyancy beams 12, positioned away from the centerline, generates a greater anti-rollover moment, effectively improving the lateral stability of the narrow board. The two anti-rollover fabrics 3 on the board surface correspond vertically to the two inflatable buoyancy beams 12 at the bottom, forming a bidirectional bending resistance structure similar to antagonistic muscles through the top tension layer and the bottom inflatable beams. This balances the bending resistance of the upper and lower sides of the board, preventing the upper side from being relatively weakened due to increased stiffness at the bottom. Combined with the longitudinal reinforcement of the double-sided central carbon fiber PVC2, the structure is simplified and the effect is significant.

[0049] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present invention are also within the protection scope of the present invention.

Claims

1. An inflatable standing paddleboard with double buoyancy beams, characterized in that: The plate includes a main air chamber inside. The top surface of the plate is provided with a main air chamber inflation valve (10) for inflating and deflating the main air chamber. The tail of the plate is provided with an independent air chamber (8) that is independent of the main air chamber. The independent air chamber (8) is implemented by having an independent inflation valve. The left and right sides of the water-contacting surface of the plate are respectively provided with inflatable buoyancy beams (12) extending along the length of the plate. The tail end of each inflatable buoyancy beam (12) is connected to the interior of the independent air chamber (8). The left and right sides of the top surface of the plate are respectively provided with plate surface anti-resistant cloth (3). The two plate surface anti-resistant cloths (3) are respectively arranged vertically and vertically corresponding to the two inflatable buoyancy beams (12).

2. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: The planar profile of the inflatable buoyancy beam (12) is a long teardrop shape. The front and rear ends of the inflatable buoyancy beam (12) are gradually narrowed and the width in the middle is greater than the width at the front and rear ends. The cross section of the inflatable buoyancy beam (12) is an arc shape that bulges away from the water surface of the plate. The two inflatable buoyancy beams (12) are arranged symmetrically about the longitudinal center line of the plate. Each inflatable buoyancy beam (12) is set close to the edge of the plate on the corresponding side. The front end of the inflatable buoyancy beam (12) extends towards the head of the plate and its rear end extends towards the tail of the plate and terminates in the area where the independent air chamber (8) is located. Each of the inflatable buoyancy beams (12) is equipped with a carbon fiber wear-resistant strip on its outer surface, which is attached to the bottom outer surface of the inflatable buoyancy beam (12) in a manner that extends along the length of the inflatable buoyancy beam (12).

3. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: The board-face resisting cloth (3) is in the shape of a willow leaf and extends along the length of the board. The board-face resisting cloth (3) is attached to the PVC layer on the top surface of the board. The two boards-face resisting cloths (3) are located directly above the corresponding inflatable buoyancy beam (12).

4. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: Carbon fiber PVC (2) is provided in the center of the top surface and the water-contacting surface of the plate. The carbon fiber PVC (2) extends along the length of the plate and is in the shape of a strip. The carbon fiber PVC (2) is located between the two anti-corrosion cloths (3) on the plate.

5. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: The top surface of the board is provided with standing friction texture (5), which is located in the middle and rear area of ​​the board and is formed by covering the standing and stepping area with a fish scale pattern. A foot pad (9) is provided behind the standing friction texture (5). The foot pad (9) is located behind the independent air chamber (8). The foot pad (9) has a top surface (17) and an inclined surface (16) that is inclined towards the front of the plate.

6. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: The tail region of the water-contacting surface of the plate is equipped with a tail fin base (13) on which a tail fin (14) is mounted, the tail fin (14) being formed in a downward extending manner.

7. The inflatable standing paddleboard with double buoyancy beams according to claim 1, characterized in that: The front end of the plate is provided with a detachable flow guide head (1), the rear edge of the plate is provided with a tail flow guide and drag reduction strip (15), and the outer edge of the plate is surrounded by a edging cloth (7).

8. The method for an inflatable standing paddleboard with double buoyancy beams according to any one of claims 1-7, characterized in that: The shape area corresponding to the independent air chamber (8) is cut out in the rear area of ​​the filament fabric of the plate. The independent air chamber (8) and the main air chamber of the plate are airtightly isolated by a double-layer fabric strip structure. The double-layer fabric strip structure is formed by high-frequency heat sealing two fabric strips along the middle length direction. The two fabric strips form a heat sealing band in the middle and movable adhesive wings are formed on both sides of the heat sealing band. The two adhesive wings on one side are respectively bonded to the top surface and the water-contacting surface of the cut-out independent air chamber of the plate. The two adhesive wings on the other side are respectively bonded to the top surface and the water-contacting surface of the filament fabric of the independent air chamber (8). Thus, the two fabric strips together form a double-layer sealing structure. Straight-grained PVC base fabric is bonded to the left and right sides of the water-contacting surface of the board. The straight stripes of the straight-grained PVC base fabric extend in the same direction as its length. Each straight-grained PVC base fabric is also covered with a larger twill PVC surface fabric. The edge of the twill PVC surface fabric is bonded and sealed to the edge of the straight-grained PVC base fabric, and an inflatable buoyancy beam (12) bladder is formed between the two. The twill-cut surface fabric has greater deformation and toughness when inflated to adapt to the expansion deformation of the arc section of the inflatable buoyancy beam (12). The straight-line PVC base fabric has matching air holes at the corresponding positions of the independent air chamber (8) and the corresponding positions of the independent air chamber (8) to form a connecting air passage, so that the air buoyancy beams (12) on both sides are inflated and expanded synchronously when the independent air chamber (8) is inflated. When sealing, first seal the independent air chamber (8), and then seal the outer perimeter of the main air chamber of the plate through the surrounding cloth (7).

9. The method for an inflatable standing paddleboard with double buoyancy beams according to claim 8, characterized in that: The bonding position between the twill PVC fabric and the straight PVC base fabric is also surrounded by a twill-cut sealing strip to further enhance the sealing performance of the edge of the inflatable buoyancy beam (12) bladder. After attaching a carbon fiber wear-resistant strip extending along its length to the bottom of the outer surface of each inflatable buoyancy beam (12), a layer of wrapping cloth is then used to cover the entire outer surface of the inflatable buoyancy beam (12). The edge of the wrapping cloth is sealed and fixed to the water-contacting surface of the plate by a sealing strip.

10. The method for an inflatable standing paddleboard with double buoyancy beams according to claim 8, characterized in that: The ratio of the drawing height of the sheet metal to the width of the fabric strip is 1:1.2 to 1:1.8; The width of the heat-sealing strip in the middle of the double-layered fabric strip is 70% to 80% of the total width of the fabric strip, and the width of the adhesive flanges on both sides is equal and symmetrically distributed on both sides of the heat-sealing strip.

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