Method for manufacturing a tubular inflatable device, and associated inflatable devices

Abstract

The aim of the invention is to provide a method for producing tubular inflatable devices (1) intended to withstand high compressive forces. The solution proposed by the invention is a method for manufacturing a tubular inflatable device (1), the method comprising: • providing (F1) a drop-stitch structure (2), • cutting out (D1) a first layer (21) of the drop-stitch structure so as to form separate second-layer strips (221) having a width less than or equal to "L / (2π)-e" and greater than or equal to "0.55 (L / (2π)-e)", • joining (J1, J2), in an air-tight manner, so as to bend and close the drop-stitch structure in order to obtain the tubular shape, • joining (J3) a crown (3), in an air-tight manner, at each end of the tubular shape, • arranging (A1) a valve (4).

Description

METHOD FOR MANUFACTURED A TUBULAR-SHAPED INFLATABLE DEVICE AND ASSOCIATED INFLATABLE DEVICES Scope of the invention

[0001] The invention relates to the field of manufacturing processes for inflatable devices of tubular shape.

[0002] More specifically, the invention relates to the field of processes for the manufacture of inflatable devices intended for the protection of structures, for example, of the fender type. State of the art

[0003] We are familiar with cylindrical protective devices such as fenders. Fenders are shock-absorbing devices designed to protect the hull of a boat when it comes into contact with the hull of another boat or with a docking structure. A fender is an elongated, flexible, and watertight cylindrical element, slightly compressed to create an inflated, shock-absorbing element. Due to the mass and inertia of moving boats, fenders must withstand significant compressive forces. Fenders are used at the dock and in areas of heavy traffic, such as in a port. However, fenders are stowed away when sailing in less densely populated areas to prevent them from chafing against the hull or being lost at sea. Fenders can be quite bulky, especially given the limited space on a boat.

[0004] Document FR 3080088 A1 (DUFFOUR) attempts to address this storage problem by providing fenders with internal compartments for storing items. However, this solution is not entirely satisfactory. Boats typically carry several fenders, and it can sometimes be difficult to store them all in the boat's lockers.

[0005] Another solution to the bulkiness problem is to provide inflatable fenders in the form of a drop-stitch structural panel. However, because these inflatable fenders are flat, significant friction can occur when subjected to shear stress, unlike cylindrical fenders which can roll against the hull. This friction leads to rapid degradation of this type of fender.

[0006] Documents WO 2022 / 064 135 A1 (AIRMANN) and US 2023 / 320930 A1 (TRU GRIT FITNESS) disclose methods for bending, to a certain extent, a drop-stitch structural board. However, the methods disclosed in these documents are not entirely satisfactory for the manufacture of protective devices such as fenders. Indeed, the inflatable objects obtained by these methods, namely an inflatable armchair and an inflatable bath, are far removed from the realm of protective devices and do not have a shape suitable for effective boat protection. These inflatable objects are also not designed to withstand significant compressive forces.

[0007] We finally know, from document CN 218 375 609, a polygonal inflatable pool and its manufacturing process. The pool is designed to have flat internal walls, which are more aesthetically pleasing than other inflatable pools. The pool comprises a wall made up of several layers, each with at least one integrated layer, an outer fabric layer, an inner fabric layer, an outer adhesive tape layer applied to the outer surface of the outer fabric layer, and an inner adhesive tape layer applied to the outer surface of the inner fabric layer.

[0008] Such a pool is not designed to withstand significant compressive forces.

[0009] Faced with this situation, the invention aims to provide a process for manufacturing inflatable devices designed to withstand significant compression forces. Summary of the invention

[0010] The solution proposed by the invention is, initially, a method for manufacturing a tubular inflatable device as defined by claim 1. It comprises the following steps: • Supply (F1) of a drop-stitch structure comprising: o A first, airtight layer of initial length "L" and width "I", o A second, airtight layer of equal length to the initial length "L" of said first layer plus or minus 10%, and of equal width to the width "I" of said first layer plus or minus 10%, o A set of wires connecting said first layer to said second layer, and capable of maintaining said first layer at a distance "e" from said second layer in inflated condition, • Cutting (D1) of said second layer so as to form disjointed second layer strips extending transversely to the length "L" over the entire width "I", said second layer strips each having a width less than or equal to "L / (2TT) - e", and greater than or equal to "0.55 ( L / (2TT) - e )", • Joint (J1), airtight, for each pair of adjacent second-layer strips, of an edge of a first second-layer strip with an adjacent edge of the second second-layer strip, so as to curve the drop-point structure to obtain said tubular shape, said second layer forming an internal surface of said tubular shape and said first layer forming an external surface of said tubular shape, • Airtight joint (J2) from one edge of a first longitudinal end of said first layer to one edge of a second longitudinal end of said first layer, and from one edge of a first longitudinal end of said second layer to one edge of a second longitudinal end of said second layer, so as to longitudinally close said tubular shape, • Joint (J3), airtight, at each end of said tubular form, of an inner edge of a ring, airtight, to a longitudinal edge of said second layer, and of an outer edge of said ring to a longitudinal edge of said first layer, so as to close, in an airtight manner, each of said ends of said tubular form, • Arrangement (A1) of a valve on said first layer, or on said second layer, or on one of said crowns so as to permit the introduction of air into said inflatable tubular form.

[0011] The process also includes a step of removing a portion of the wires located opposite the cuts.

[0012] According to the process according to the invention, the removal step consists of removing either a portion of the length of wire, or a part of the quantity of wires that are opposite the cut over their entire length (or substantially over their entire length), in particular at least 50% of the wires (i.e. one wire out of two).

[0013] In particular, for each free end wire opposite the cutouts, the process includes a step of removing a portion of at least 80% of the length of said wire.

[0014] The portion of wire length removed, concerning the wires opposite the cuts, can vary between 10% and 100% of the wire length.

[0015] The proportion of the quantity of threads removed, over their entire length, opposite the cuts, can be between 10 and 100%.

[0016] The step of removing threads, either partially or completely, or part of the length of the threads located opposite the cut edges, facilitates the joining of the edges of the second-layer strips. Indeed, the approach to the edges of the strips is not hindered, or only slightly hindered, by the presence of threads that create a buildup of material behind the edges of the strips being joined. This buildup of material (a mass of threads) makes the joining step difficult: without the removal step, excess thickness can develop at the edge join, weakening the joint.

[0017] Furthermore, the cutting stage produces second-layer strips whose width is meticulously chosen so that, once the tubular shape is inflated, its internal surface is free of creases. Indeed, at a crease, the surface variation generates significant pressure differentials, amplified under compression conditions with the boat's hull, and can lead to the inflatable device bursting. Also, the width of the second-layer strips is carefully selected to minimize the number of cuts and seams. Indeed, seams are potential weak points in an inflatable device. Thus, the fewer seams there are, the lower the risk of rupture at the joints.Furthermore, maintaining a minimal width for the second-layer strips allows for the bonding of the fitting strips with a larger overlap area, thus improving the sealing and strength of the joints and further reducing the risk of rupture at said joints. Also, the arrangement of crowns at the ends ensures greater sealing compared to the solution of making oblique cuts on straight strips arranged, prior to any cutting, on the sides of the drop-stitch structure. The combination of all these features results in a tubular inflatable device capable of withstanding significant compressive forces. Moreover, the tubular shape obtained by this process allows the inflatable device, when used as a fender and subjected to shear stress, to roll along the hull of the boat.The tubular shape also allows for interior storage space. Finally, on all the boat's fenders, some can be kept inflated in case of sudden need, and others can be deflated to optimize storage.

[0018] According to one embodiment, the second layer strips each have a width equal to a predetermined strip width "lb" plus or minus 5%.

[0019] One advantage is that it improves the resistance of the inflatable device. Indeed, the more consistent the width of the second-layer bands, the better the pressure distribution on the internal surface of the tubular shape.

[0020] According to one embodiment, the second layer strips are regularly spaced along the length of the first layer.

[0021] One advantage is that it improves the resistance of the inflatable device. Indeed, the more even the distribution of the bands, the better the drop points are distributed, and the better the pressure distribution on the external surface of the tubular shape.

[0022] According to one embodiment, the cutting step (D1) includes making an end cut extending transversely to an initial length "L2" over the entire width "I2" at each of the longitudinal ends of the second layer.

[0023] One advantage is that it allows for improved curvature at the area where the ends close.

[0024] According to an alternative embodiment providing the same advantage, the cutting step (D1) includes making a single end cut extending transversely across the initial length "l_2" over the entire width "I2" at either of the longitudinal ends of the second layer.

[0025] It should be noted that the step of removing a portion of at least 80% of the length of said wire also has the advantage of removing any superfluous weight from the inflatable device, and of facilitating deflation by limiting the number of obstacles inside the chamber.

[0026] According to one embodiment, the joining step (J1) comprises, for each pair of adjoining second layer strips, the airtight fixing on the second layer of an airtight connecting strip, partially covering the width of each of the two said adjoining second layer strips, said connecting strip extending along the adjoining edges of said two adjoining second layer strips, over the entire width "I2" of said second layer to within 5%.

[0027] One advantage is that it allows for joints that hold up well over time, thanks to connecting strips that partially overlap the second layer strips.

[0028] According to one embodiment, the joining step (J2) comprises, for each pair of adjoining ends of the first layer, or of the second layer, the airtight fixing, on said first layer, respectively on said second layer, of an airtight end joining strip, covering each of said adjoining ends, said end joining strip extending along the adjoining edges of said two ends, over the entire width "I" of said first layer to within 5%, respectively over the entire width "I2" of said second layer to within 5%.

[0029] One advantage is that it allows for joints that hold up well over time, thanks to connecting strips that partially cover the ends of the first and second layers.

[0030] According to one embodiment, the joining step (J3) comprises, for each ring, the sub-steps of: • Airtight fixing, on said ring, of an airtight inner strip, on the inner edge of said ring so as to form an internal skirt intended to fit onto the inside of the tubular shape, • Airtight attachment, on said crown, of an airtight outer band, on the outer edge of said crown so as to form an outer skirt intended to fit onto the outside of said tubular form.

[0031] One advantage is that it allows the creation of skirts, facilitating the placement of crowns at the ends of the tubular shape.

[0032] According to one embodiment, the joining step (J3) comprises, for each ring, at the associated end of the tubular shape, the following substeps: • Airtight fixing on the first layer of the outer strip, • Airtight fixing on the second layer of the inner strip.

[0033] One advantage is that it allows for joints that hold up well over time, thanks to skirts that conform to the tubular shape without creasing.

[0034] According to one embodiment, the joining step (J3) comprises, for each end of the tubular shape, the following substeps: • Airtight fixing of an airtight outer finishing strip to the crown, outer strip and first layer, said outer finishing strip extending from said crown to said first layer, covering said outer strip over its entire outer periphery, • Airtight fixing of an airtight inner finishing strip on the crown, said inner strip and the second layer, said inner finishing strip extending from said crown to said second layer, covering said inner strip over the entire inner periphery.

[0035] One advantage is that it allows for joints that hold up well over time by doubling the sealing of the skirts with a finishing strip.

[0036] Another aspect of the invention relates to an inflatable tubular device comprising: • An external tubular surface formed by: o A first, airtight layer of a drop-point structure, said first layer having a length "L" and a width "I", and o The airtight joint of the longitudinal ends of said first layer, • An internal tubular surface formed by: o The airtight joint of the strips of a second, airtight layer of said drop-stitch structure, said second-layer strips extending transversely over a length "L2" of said second layer and over the entire width "I2" of said second layer, said second-layer strips each having a width less than or equal to "L / (2TT) - e" and greater than or equal to "0.55 (L / (2TT) - e)" and o The airtight joint of the longitudinal ends of said second layer, • A set of threads, of said drop-stitch structure, connecting said first layer to said second layer, and capable of maintaining said first layer at a distance "e" from said second layer in its inflated condition, • A crown, at each end of said tubular shape, sealing said end of said tubular shape, • A valve suitable for allowing the introduction of air into said inflatable tubular form, said valve being arranged on said first layer, or on said second layer, or on one of said crowns.

[0037] Therefore, the width of the second-layer bands is carefully chosen to ensure that, once the inflatable device is inflated, its internal surface is free of creases. Indeed, at a crease, the surface variation generates significant pressure differentials, amplified under compression conditions, which can lead to the device bursting. The width of the second-layer bands is also judiciously chosen to limit the number of cuts and seams. Seams are potential weak points in an inflatable device; thus, the fewer seams there are, the lower the risk of rupture.Furthermore, maintaining a minimal width for the second-layer strips allows for the bonding of connecting strips with a larger overlap area, thereby improving the sealing and strength of the joints and further reducing the risk of rupture at these joints. Additionally, the arrangement of crowns at the ends ensures greater sealing compared to the solution of making oblique cuts on straight strips arranged, prior to any cutting, on the sides of the drop-stitch structure. The combination of all these features results in a tubular inflatable device capable of withstanding significant compressive forces.

[0038] According to one embodiment, the tubular inflatable device is a fender.

[0039] Indeed, the tubular inflatable fender is specifically designed for use as a fender. The absence of folds on the internal surface limits pressure differentials inside the fender, even when it is subjected to significant compressive stress against the boat's hull. Furthermore, the width of the second-layer bands and the arrangement of the rings at the ends minimize weak points and ensure a good seal over time. The combination of all these features results in a tubular inflatable fender capable of withstanding significant compressive forces. In addition, the tubular shape allows the fender to roll along the boat's hull when subjected to shear stress. The tubular shape also provides internal storage space.Finally, of all the boat's fenders, some can be kept inflated in case of sudden need for use, and others can be deflated to optimize storage.

[0040] According to one embodiment, the tubular inflatable device is an urban protection.

[0041] The tubular inflatable barrier is also suitable for use as urban protection. This inflatable barrier can be installed on city poles and bollards to absorb potential impacts with vehicles. Damage to the vehicle and the pole or bollard can thus be limited, or even eliminated in some cases. This effect is achieved, in particular, by the carefully chosen width of the second-layer bands, ensuring that once the tubular barrier is inflated, its internal surface remains free of creases. The width of the second-layer bands and the crown arrangement at the ends also minimize weak points and guarantee a reliable seal over time. The combination of all these features results in a tubular inflatable barrier capable of withstanding significant compressive forces.In addition, the tubular shape allows the urban protection, when subjected to shear stress, to roll on the car body, around the pole or bollard. Brief description of the figures

[0042] Other features and advantages of the invention will become apparent from the detailed description that follows, with reference to the attached figures, which illustrate: • Figure 1: is a schematic view of an example of the realization of a drop-point structure provided in step (F1) of the manufacturing process which is the subject of the invention; • Figure 2: is a schematic view of the drop-point structure shown in Figure 1 on which the cuts of the cutting step (D1) of the manufacturing process that is the subject of the invention are shown by dotted lines; • Figure 3: is a schematic view of the drop-point structure shown in Figure 2 at the end of the cutting step (D1) of the manufacturing process that is the subject of the invention; • Figure 4: is a schematic view of the drop-point structure shown in Figure 3 having a tubular shape after the joining steps (J1) and (J2) of the manufacturing process that is the subject of the invention; • Figure 4BIS: is a schematic view of an alternative embodiment of the drop-stitch structure shown in Figure 4, obtained after a thread removal step different from that carried out to obtain the structure of Figure 4. It can be observed that the differences are internal to the structure and located at the joints of the inner wall; • Figure 5: is a schematic view of an example of an embodiment of a ring intended to close the ends of the tubular shape at the joining step (J3) of the manufacturing process which is the subject of the invention; • Figure 6: is a schematic view of the crown of figure 5 on which an inner band and an outer band are fixed so as to form an inner skirt and an outer skirt; • Figure 7: is a schematic view of an example of the implementation of the drop-point structure shown in Figure 5 after implementation of the joining (J3) and arrangement (A1) steps of the manufacturing process which is the subject of the invention, said drop-point structure being closed at each of its ends by a ring equipped with skirts according to Figure 6, and being equipped with a valve; • Figure 8: is a schematic view of an example of the implementation of the steps of the manufacturing process that is the subject of the invention. Description of the invention

[0043] The invention relates to a method for manufacturing a tubular inflatable device 1. An example of an embodiment of the tubular inflatable device 1 is shown in the figure]. The tubular inflatable device 1 is, for example, a fender or urban protection.

[0044] According to one embodiment, the tubular inflatable device 1 is capable of withstanding repeated compressive forces exceeding 2 kN. According to another embodiment, the tubular inflatable device 1 is capable of withstanding repeated compressive forces exceeding 5 kN. According to another embodiment, the tubular inflatable device 1 is capable of withstanding repeated compressive forces exceeding 10 kN.

[0045] According to one embodiment, the tubular inflatable device 1 is capable of withstanding the impact of a vehicle weighing several hundred kilograms moving at a speed of less than 10 km / h. The vehicle is, for example, a motor vehicle, a boat, or any other vehicle suitable to a person skilled in the art.

[0046] With reference to Figure 8, the manufacturing process includes a supply step (F1) of a drop-stitch structure 2. An example of a drop-stitch structure 2 supplied at the supply step (F1) is shown in Figure 1. This figure, as well as Figures 2 to 7, include schematic representations, some dimensions of which have been deliberately stretched to facilitate understanding.

[0047] The drop-stitch structure 2 comprises a first layer 21. This layer is airtight. The first layer 21 has a length "L" and a width "I". In one embodiment, the length "L" varies between 0.5 m and 4 m and the width "I" varies between 0.5 m and 1 m. In another embodiment, the length "L" varies between 0.8 m and 2.5 m and the width "I" varies between 0.5 m and 1 m. In one embodiment, the first layer 21 comprises a fabric made of natural or synthetic fibers, for example, nylon, viscose, or any other weaving material suitable to those skilled in the art. The fabric is covered with an airtight material, for example, thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), or any other airtight material suitable to those skilled in the art. According to one embodiment, the first layer 21 has a thickness varying from 0.1 mm to 10 mm.

[0048] The drop-point structure 2 has a second layer 22. This layer is airtight.

[0049] The second layer 22 has an initial length "L2" equal to the length "L" of the first layer 21, to within ±10%. In one embodiment, the second layer 22 has an initial length "L2" equal to the length "L" of the first layer 21, to within ±5%. In another embodiment, the second layer 22 has an initial length "L2" equal to the length "L" of the first layer 21, to within ±1%.

[0050] The second layer 22 has a width "I2" equal to the width "I" of the first layer 21 to within ±10%. In one embodiment, the second layer 22 has a width "I2" equal to the width "I" of the first layer 21 to within ±5%. In another embodiment, the second layer 22 has a width "I2" equal to the width "I" of the first layer 21 to within ±1%.

[0051] In one embodiment, the second layer 22 comprises a fabric made of natural or synthetic fibers, for example, nylon, viscose, or any other weaving material suitable to those skilled in the art. The fabric is coated with an airtight material, for example, thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), or any other airtight material suitable to those skilled in the art. In one embodiment, the second layer 22 has a thickness ranging from 0.1 mm to 10 mm.

[0052] The drop-stitch structure 2 includes a set of wires 23 connecting the first layer 21 to the second layer 22. The set of wires 23 is suitable for maintaining the first layer 21 at a distance "e" from the second layer 22 in inflated condition.

[0053] In practice, the first layer 21 has an inner face to which the wires 23 are anchored and an outer surface opposite said inner face. Similarly, the second layer 22 has an inner face to which the wires 23 are anchored and an outer surface opposite said inner face. The wires thus extend between the inner face of the first layer 21 and the inner face of the second layer 22. The inner face of the first layer 21 and the inner face of the second layer 22 define an internal space 24 intended to contain pressurized air when said internal space is sealed airtight.The term "maintaining the first layer 21 at a distance "e" from the second layer 22 in inflated condition" means that the maximum distance separating the inner face of the first layer 21 and the inner face of the second layer 22, when the internal space 24 contains air under pressure at a pressure of 1 bar, is equal to "e".

[0054] In one embodiment, the distance "e" varies between 10 mm and 100 mm. In another embodiment, the distance "e" varies between 50 mm and 800 mm. In one embodiment, the yarns are made of natural or synthetic fiber, for example, nylon, viscose, or any other weaving material suitable to those skilled in the art.

[0055] Referring to Figure 8, the manufacturing process includes a cutting step (D1) of the second layer 22. The cutting step (D1) is implemented to form disjointed strips of the second layer 221. An example of disjointed strips of the second layer 221 is shown in Figure 3.

[0056] Depending on the cutting step (D1), it is implemented so as to form at least 7 disjointed strips of the second layer 221. Depending on the cutting step (D1), it is implemented so as to form a maximum of 13 disjointed strips of the second layer 221.

[0057] In one embodiment, the cutting step (D1) is carried out using a cutting tool. This tool includes, for example, one or more scissors, and / or one or more knives, and / or any other cutting tool suitable for a person skilled in the art. In one embodiment, the cutting tool is operated manually. In another embodiment, the cutting tool is operated by an automated system.

[0058] The second layer strips 221 extend transversely along the length "L2" over the entire width "I2". Each of the second layer strips 221 has a width "Ibi" less than or equal to "L / (2TT) - e", and greater than or equal to "0.55 ( L / (2TT) - e )".

[0059] According to one embodiment, the cutting step (D1) includes the making of separation cuts 222. The separation cuts 222 are represented schematically in dashed lines on figure 2. Each separation cut 222 separates two adjacent strips of second layer 221.

[0060] According to one embodiment, the cutting step (D1) includes making at least 6 separation cuts 222. According to another embodiment, the cutting step (D1) includes making a maximum of 12 separation cuts 222.

[0061] According to one embodiment, the separating cutouts each have a width "Ids" less than or equal to the distance "e", and greater than or equal to 0.55 times the distance "e", when the drop-point structure 2 is arranged flat.

[0062] According to one embodiment, the sum of the widths "Ibi" of the second-layer strips 221 is equal to "L - 2ire" to within ±10%. According to another embodiment, the sum of the widths "Ibi" of the second-layer strips 221 is equal to "L - 2ire" to within ±5%. According to another embodiment, the sum of the widths "Ibi" of the second-layer strips 221 is equal to "L - 2ire" to within ±1%.

[0063] According to one embodiment, the second layer strips 221 each have a width "Ibi" equal to a predetermined strip width "lb" plus or minus 5%. The predetermined strip width "lb" is chosen to be less than or equal to "L / (2TT) - e", and greater than or equal to "0.55 ( L / (2TT) - e )".

[0064] According to one embodiment, the second layer strips 221 are regularly spaced along the length of the first layer 21.

[0065] In one embodiment, the cutting step (D1) comprises making an end cut 223 at each of the longitudinal ends of the second layer 22. The end cuts 223 are schematically represented by dashed lines in Figure 2. The end cuts 223 extend transversely from an initial length "L2" across the entire width "I2" at each of the longitudinal ends of the second layer 22. In one embodiment, the two end cuts 223 each have the same width "Ide" equal to half the predetermined separation width "Ids" plus or minus 10%. In another embodiment, the two end cuts 223 each have the same width "Ide" equal to half the predetermined separation width "Ids" plus or minus 5%.According to one embodiment, the two end cutouts 223 each have the same width "Ide" equal to half of the predetermined separation width "Ids" plus or minus 1%.

[0066] According to one embodiment, the cutting step (D1) comprises making a single end cut 223. This cut extends transversely across the initial length "L2" over the entire width "I2" at either of the longitudinal ends of the second layer 222. According to one embodiment, the single end cut has a width equal to the predetermined separation width "Ids" to within ±10%. According to another embodiment, the single end cut has a width equal to the predetermined separation width "Ids" to within ±5%. According to another embodiment, the single end cut has a width equal to the predetermined separation width "Ids" to within ±1%.

[0067] According to one embodiment, the process includes, for each free-ended wire 23 opposite the cutouts, a removal step (E1) of a portion of at least 80% of the length of said wire. Remaining portions 231 of the cut wires 23 are shown in Figures 3 and 4. According to one embodiment, the free-ended wires 23 opposite the cutouts are completely removed in the removal step (E1).

[0068] The term "free end wire" refers to wires that were initially anchored to the second layer 22 but, after the cutting step (D1), are no longer anchored to said second layer. Indeed, after the removal of the separation cuts 222 and the end cut(s) 223, the wires, which were initially anchored to the cut strips of the second layer 22, are no longer connected to the second layer once these cut strips have been removed.

[0069] The removal step (E1) is carried out by cutting, by heat cutting, by tearing, or by any other method of removing wires, in part or in whole, suitable to a person skilled in the art.

[0070] The removal step (E1) is, for example, carried out using a cutting tool. This tool includes, for example, one or more scissors, and / or one or more knives, and / or any other cutting tool suitable for a person skilled in the art. In one embodiment, the cutting tool is operated manually. In another embodiment, the cutting tool is operated by a machine.

[0071] According to an alternative embodiment, the removal step is carried out not over a portion of length of at least 80% (i.e. 80% of the length or more, or even over the entire length) but over a shorter length: for example, cutting the wires at one of their ends (using a cutting tool) and removing 10% of the wire length, on all the wires, may be sufficient to make it easier to bring together and join two edges of two contiguous strips, to form the inner wall of the tubular inflatable device according to the invention without creating accumulations of material behind the joint.

[0072] Indeed, if the wires are not at least partially cut along their length, or if at least some of the wires opposite a cut are not removed, clumps of wire (accumulation of material) form behind the joints (the joints will be described below). These clumps of wire not only complicate the joining process, but also create pressure on the joint, which can weaken it.

[0073] As an alternative to removing a portion of the wire length opposite the cuts, it is also possible to remove only some of the wires: in other words, instead of cutting all the wires in the same way along their length, it is possible to remove only a portion of them. A portion of the cut wires is thus retained; they are therefore present, but fewer in number, opposite the cuts. Depending on the type of wires and the quantity removed, this method of wire removal prevents the formation of troublesome accumulations behind the seams, which could lead to weaknesses. Figure 4BIS illustrates an inflatable device according to the invention where the wires opposite the seams, once the device is assembled, have not all been cut.

[0074] The wires that were not all cut were those that were opposite the cuts during the manufacturing process: some of the wires were not removed but a sufficient quantity was removed so that, after making the joints (edges joined 224), there are no troublesome clumps of material (wires) preventing the making of the joints or exerting pressure on the joints that could create weaknesses in the robustness of the joint.

[0075] Referring to Figure 8, the manufacturing process includes an airtight joining step (J1) for each pair of adjacent second-layer strips 221, of an edge of a first second-layer strip 221 with an adjacent edge of the second second-layer strip 221. Achieving an airtight seal between all the adjacent second-layer strips 221 makes it possible to obtain a second layer 22 that is airtight over its entire surface.

[0076] The joining step (J1) is implemented to bend the drop-stitch structure 2 to obtain the tubular shape 25 of the inflatable tubular device 1. Figure 4 shows the curved drop-stitch structure 2 after the joining step (J1), thus forming the tubular shape 25. As shown in Figure 4, the second layer 22 forms an internal surface 252 of the tubular shape 25. The internal surface 252 has a cylindrical shape. Similarly, referring again to Figure 4, the first layer 21 forms an external surface 251 of the tubular shape 25. The external surface 251 has a cylindrical shape.

[0077] According to one embodiment, the joining step (J1) is implemented, for each pair of adjacent second layer strips 221, by gluing, by heat gluing, by welding, or by any other joining method suitable to a person skilled in the art, of the edge of the first second layer strip 221 with the adjacent edge of the second second layer strip 221.

[0078] According to one embodiment, the joining step (J1) comprises, for each pair of adjacent second-layer strips 221, the airtight attachment of a connecting strip 26 to the second layer 22. This airtight connecting strip partially covers the width of each of the two adjacent second-layer strips 221. The attachment is achieved, for example, by gluing, heat-sealing, welding, or any other joining method suitable to those skilled in the art. Figures 4 and 7 show the connecting strips 26 attached to the second-layer strips 221. In particular, in Figure 4, the position of a connecting strip 26 at the adjacent edges 224 is visible for each cross-section of adjacent second-layer strips 221.

[0079] When bonding is achieved, the surfaces of the second-layer strips 221 and the connecting strips 26 intended to be in contact are cleaned, possibly degreased, dried if damp, and then coated with adhesive before being brought into contact with each other. The adhesive is, for example, a cold-curing polyurethane adhesive. The adhesive has, for example, a density of 0.9 g / cm³ ± 10%. In one embodiment, a catalyst is added to the adhesive to improve the airtightness of the bond.

[0080] According to one embodiment, each connecting strip 26 extends along the adjoining edges 224 of the two adjacent second-layer strips 221, over the entire width "I2" of the second layer 22, plus or minus 5%. As such, each connecting strip 26 has a length between "0.95 I2" and "1.05 I2".

[0081] According to one embodiment, each connecting strip 26 extends along the adjoining edges 224 of the two adjacent second-layer strips 221, over the entire width "I2" of the second layer 22 to within ±1%. As such, each connecting strip 26 has a length between "0.99 I2" and "1.01 I2".

[0082] According to one embodiment, each connecting strip 26 covers the outer surface of each strip of the pair of adjacent second layer strips 221 over a width between 1 cm and 4 cm.

[0083] According to one embodiment, each connecting strip 26 has a width between 2 cm and 8 cm. According to another embodiment, each connecting strip 26 has a width of 3 cm plus or minus 5%. According to yet another embodiment, each connecting strip 26 has a width of 3 cm plus or minus 1%.

[0084] According to one embodiment, the joining strips 26 are made of an airtight material, for example, thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), or any other airtight material suitable to those skilled in the art. The joining strips 26 are, for example, made of polyvinyl chloride (PVC) with a surface mass greater than 900 g / m². 2 According to one embodiment, the joining strips 26 are made of polyvinyl chloride (PVC) with a surface mass of 1050 g / m². 2 .

[0085] In one embodiment, the joining step (J1) is performed manually. In another embodiment, the joining step (J1) is performed using an automated system. In one embodiment, the automated system includes a roll of splice tape with the width of the splice tapes 26. The automated system includes a cutting tool capable of cutting splice tapes 26 from the splice tape on the roll. In one embodiment, the automated system includes grippers capable of handling the splice tapes 26. In one embodiment, the automated system includes one or more glue applicators equipped with a metering pump, capable of applying glue to the splice tapes 26 and the second-layer tapes 221. In one embodiment, the grippers of the automated system are capable of bringing the splice tapes 26 and the second-layer tapes 221 into contact after gluing.

[0086] Referring to figure 8, the manufacturing process includes an airtight sealing step (J2): • From an edge of a first longitudinal end of the first layer 21 to an edge of a second longitudinal end of said first layer, and • From an edge of a first longitudinal end of the second layer 22 to an edge of a second longitudinal end of said second layer.

[0087] The joining step (J2) is implemented so as to longitudinally close the tubular shape 25 of the inflatable tubular device 1. Thus, the external surface 251 of the tubular shape 25 is airtight along its entire outer periphery. Likewise, the internal surface 252 of the tubular shape 25 is airtight along its entire inner periphery. Figure 4 shows the curved, drop-point structure 2 closed upon itself after the joining steps (J1) and (J2), thus forming the closed tubular shape 25.

[0088] According to one embodiment, the joining step (J2) is implemented for the pair of longitudinal ends of the first layer 21, respectively for the pair of longitudinal ends of the second layer 22, by gluing, by heat gluing, by welding, or by any other joining means suitable to the person skilled in the art, of the edge of the first longitudinal end with the edge of the second longitudinal end.

[0089] According to one embodiment, the joining step (J2) comprises, for the pair of abutting ends of the first layer 21, the airtight attachment, to said first layer, of a first airtight end joint strip 27. The attachment is, for example, achieved by gluing, heat bonding, welding, or any other joining method suitable to those skilled in the art. Figure 4 shows the end joint strip 27 attached to the ends of the first layer 21 at the abutting edges 215.

[0090] When bonding is achieved, the end surfaces of the first layer 21 and the first end joint strip 27 intended to be in contact are cleaned, possibly degreased, dried if damp, and then coated with adhesive before being brought into contact with each other. The adhesive is of the same type as previously described. Similarly, a catalyst may be added to the adhesive.

[0091] The first end joining strip 27 covers each of the adjoining ends of the first layer 21. According to one embodiment, the first end joining strip 27 covers the outer surface of each end of the first layer 21 over a width between 1 cm and 4 cm.

[0092] According to one embodiment, the first end joining strip 27 has a width between 2 cm and 8 cm. According to another embodiment, the first end joining strip 27 has a width of 3 cm plus or minus 5%. According to another embodiment, the first end joining strip 27 has a width of 3 cm plus or minus 1%.

[0093] The first end joint strip 27 extends along the adjoining edges 215 of both ends of the first layer 21, over the entire width "I" of said first layer 21 to within ±5%. As such, the first end joint strip 27 has a length between "0.95 I" and "1.05 I".

[0094] According to one embodiment, the first end joint strip 27 extends along the adjoining edges 215 of both ends of the first layer 21, over the entire width "I" of said first layer 21 to within ±1%. As such, the first end joint strip 27 has a length between "0.99 I" and "1.01 I".

[0095] The first end joining strip 27 is made of materials similar to the joining strips 26 and has a similar surface mass.

[0096] According to one embodiment, the joining step (J2) comprises, for the pair of abutting ends of the second layer 22, the airtight attachment, to said second layer, of a second airtight end joint strip 28. The attachment is, for example, achieved by bonding, heat sealing, welding, or any other joining method suitable to those skilled in the art. Figure 4 shows the end joint strip 28 attached to the ends of the second layer 22 at the abutting edges 225.

[0097] When bonding is achieved, the end surfaces of the second layer 22 and the second end joint strip 28 intended to be in contact are cleaned, possibly degreased, dried if damp, and then coated with adhesive before being brought into contact with each other. The adhesive is of the same type as previously described. Similarly, a catalyst may be added to the adhesive.

[0098] The second end joining strip 28 covers each of the adjoining ends of the second layer 22. According to one embodiment, the second end joining strip 28 covers the outer surface of each end of the second layer 22 over a width between 1 cm and 4 cm.

[0099] According to one embodiment, the second end joining strip 28 has a width between 2 cm and 8 cm. According to another embodiment, the second end joining strip 28 has a width of 3 cm ± 5%. According to another embodiment, the second end joining strip 28 has a width of 3 cm ± 1%.

[0100] The second end joint strip 28 extends along the adjoining edges 225 of both ends of the second layer 22 over the entire width "I2" of said second layer, plus or minus 5%. As such, the second end joint strip 28 has a length between "0.95 I2" and "1.05 I2".

[0101] According to one embodiment, the second end joint strip 28 extends along the adjoining edges 225 of both ends of the second layer 22, over the entire width "I" of said second layer 22 to within ±1%. As such, the second end joint strip 28 has a length between "0.99 I2" and "1.01 I2".

[0102] The first end joining strip 28 is made of materials similar to the joining strips 26 and has a similar surface mass.

[0103] According to one embodiment, the connecting strips 26, the first end connecting strip 27 and the second end connecting strip 28 have identical dimensions to within ±1%.

[0104] In one embodiment, the joining step (J2) is performed manually. In another embodiment, the joining step (J2) is performed using an automated system. In one embodiment, the automated system includes a roll of splicing tape with the width of the end splicing strips 27 and 28. The automated system includes a cutting tool capable of cutting the end splicing strips 27 and 28 from the splicing tape on the roll. In one embodiment, the automated system includes grippers capable of handling the end splicing strips 27 and 28. In one embodiment, the automated system includes one or more glue applicators equipped with a metering pump, capable of applying glue to the end splicing strips 27 and 28 and to the ends of the first layer 21 and the second layer 22.According to one embodiment, the grippers of the automaton are able to bring the end joining strips 27 and 28 into contact with the ends of the first layer 21 and the second layer 22 after gluing.

[0105] Referring to Figure 8, the manufacturing process includes an airtight joining step (J3) at each end of the tubular shape: • From an inner edge 32 of an airtight ring 3 to a longitudinal edge of the second layer 22, and • From an outer edge 31 of said crown to a longitudinal edge of the first layer 21.

[0106] The joining step (J3) is implemented in such a way as to seal, airtight, each end of the tubular shape 25 of the inflatable tubular device 1. Thus, the internal space 24 is hermetically sealed from the outside and can then be pressurized. Figure 7 shows the tubular shape 25 sealed at its ends by the rings 3 after the joining step (J3). Figure 5 schematically represents a ring 3.

[0107] In one embodiment, the crown 3 is obtained by cutting, from a sheet of material, an inner circle and a concentric outer circle with a larger diameter than the inner circle. Thus, the crown has no discontinuities around its perimeter. In another embodiment, the diameter "D e The diameter of the outer circle is equal to "L / TT" to within ±5%, and the diameter "Di" of the inner circle is equal to "D e- 2nd » to within plus or minus 5%. According to one embodiment, the diameter «D e The diameter of the outer circle is equal to "L / TT" to within ±1%, and the diameter "Di" of the inner circle is equal to "D e - 2nd » to within plus or minus 1%. Generally, the diameter « D e » of the outer circle is between 25 cm and 80 cm, and the diameter «Di» of the inner circle is between 15 cm and 60 cm.

[0108] The crown is made of materials similar to the 26 joining strips and has a similar surface mass.

[0109] According to one embodiment, the joining step (J3) is carried out by gluing, heat-bonding, welding, or any other joining method suitable to a person skilled in the art, of the edges of the crowns 3 to the longitudinal edges of the first layer 21 and the second layer 22.

[0110] According to one embodiment, the joining step (J3) comprises, for each ring 3, a substep of fixing, airtight, on said ring, an inner band 34, airtight, on the inner edge 32 of said ring so as to form an inner skirt intended to fit onto the inside of the tubular form 25. Figure 6 schematically represents a ring 3 on which an inner band 34 is fixed.

[0111] According to one embodiment, the inner strip 34 is curved so as to allow its bonding to the inner edge 32 without creases. The radius of curvature of the inner strip 34 is, for example, between "5Di" and "10Di".

[0112] In one embodiment, the length of the inner strip 34 is chosen so that said inner strip can cover the inner edge 32 along its entire length. In one embodiment, the inner strip 34 has a length equal to "nDi" to within ±5%. In another embodiment, the inner strip 34 has a length equal to "nDi" to within ±1%.

[0113] According to one embodiment, the inner band 34 covers the surface of the inner edge 32 of the crown s over a width between 8 mm and 30 mm.

[0114] According to one embodiment, the inner band 34 has a width between 1.5 cm and 6 cm. According to another embodiment, the inner band 34 has a width of 3 cm plus or minus 5%. According to another embodiment, the inner band 34 has a width of 3 cm plus or minus 1%.

[0115] According to one embodiment, the inner band 34 is made of an airtight material, for example, thermoplastic polyurethane (TPU), polyvinyl chloride (PVC), or any other airtight material suitable to those skilled in the art. The inner band 34 is, for example, made of polyvinyl chloride (PVC) with a surface mass between 500 g / m² 2 and 800 g / m 2 Thus, the inner strip 34 is sufficiently flexible and deformable to be worked and fixed without creases to the inner edge 32 of the crown 3. According to one embodiment, the inner strip 34 is made of polyvinyl chloride (PVC) with a surface mass of 650 g / m². 2 .

[0116] The fixing is, for example, implemented by gluing, by heat gluing, by welding, or by any other means of joining suitable to a person skilled in the art.

[0117] When the fastening is achieved by bonding, the surfaces of the inner strip 34 and the crown 3 intended to be in contact are cleaned, possibly degreased, dried if these surfaces are damp, and then coated with adhesive before being brought into contact with each other. The adhesive is of the same type as that previously described. Similarly, a catalyst may be added to the adhesive.

[0118] According to one embodiment, the joining step (J3) includes, for each ring 3, a substep of fixing, airtight, on said ring, an outer band 33, airtight, on the outer edge 31 of said ring so as to form an outer skirt intended to fit onto the outside of the tubular form 25.

[0119] Figure 6 schematically represents a crown 3 on which an outer band 33 is fixed.

[0120] In one embodiment, the outer strip 33 is curved to allow it to be bonded to the outer edge 31 without creases. The radius of curvature of the outer strip 33 is, for example, between "5D e and "10D e "

[0121] In one embodiment, the length of the outer strip 33 is chosen so that said outer strip can cover the outer edge 31 along its entire length. In one embodiment, the outer strip 33 has a length equal to "irD e "to within plus or minus 5%. According to one embodiment, the outer band 33 has a length equal to "irD e "To within plus or minus 1%."

[0122] According to one embodiment, the outer band 33 covers the surface of the outer edge 31 of the crown 3 over a width between 8 mm and 30 mm.

[0123] According to one embodiment, the outer band 33 has a width between 1.5 cm and 6 cm. According to another embodiment, the outer band 33 has a width of 3 cm plus or minus 5%. According to another embodiment, the outer band 33 has a width of 3 cm plus or minus 1%.

[0124] The outer band 33 is made of a material similar to the inner band 34 and has a similar surface mass.

[0125] The fixing is, for example, implemented by gluing, by heat gluing, by welding, or by any other means of joining suitable to a person skilled in the art.

[0126] When the fastening is achieved by bonding, the surfaces of the outer strip 33 and the crown 3 intended to be in contact are cleaned, possibly degreased, dried if damp, and then coated with adhesive before being brought into contact with each other. The adhesive is of the same type as previously described. Similarly, a catalyst may be added to the adhesive.

[0127] According to one embodiment, the joining step (J3) includes, for each ring 3, at the associated end of the tubular form 25, an airtight fixing substep on the first layer 21 of the outer band 33. Also, the joining step (J3) includes, for each ring 3, at the associated end of the tubular form 25, an airtight fixing substep on the second layer 22 of the inner band 34.

[0128] Figure 7 schematically represents rings 3 arranged at each end of the tubular shape 25. At each end, the ring 3 is equipped with an outer band 33 fitted and fixed to the outside of the first layer 21. Also, at each end, the ring 3 is equipped with an inner band 34 fitted and fixed to the inside of the second layer 22.

[0129] As before, the fixing is implemented, for example, by gluing, by heat gluing, by welding, or by any other means of joining suitable to a person skilled in the art.

[0130] When bonding is achieved by gluing, the surfaces of the outer strip 33 and the first layer 21 intended to be in contact are cleaned, possibly degreased, dried if damp, and then coated with adhesive before being pressed together. The same procedure is followed for the surfaces of the inner strip 34 and the second layer 22. The adhesive is of the same type as previously described. Similarly, a catalyst may be added to the adhesive.

[0131] According to one embodiment, the joining step (J3) comprises, for each end of the tubular form 25, an airtight substep for attaching an airtight outer finishing strip 35 to the crown 3, the outer strip 33, and the first layer 21, said outer finishing strip extending from said crown to said first layer, overlapping said outer strip over its entire outer periphery. Also, the joining step (J3) comprises, for each end of the tubular form, an airtight substep for attaching an airtight inner finishing strip 36 to the crown 3, the inner strip 34, and the second layer 22, said inner finishing strip extending from said crown to said second layer, overlapping said inner strip over its entire inner periphery.

[0132] According to one embodiment, the inner finishing strip 36 is curved to best fit the tubular shape 25 and avoid creases. The radius of curvature of the inner finishing strip 36 is, for example, between "5Di" and "10Di".

[0133] According to one embodiment, the length and width of the inner finishing strip 36 are chosen so that said inner finishing strip can cover the entire inner strip 34, part of the crown 3 and part of the second layer 22. Figure 6 schematically represents this overlap.

[0134] According to one embodiment, the interior finishing strip 36 has a length equal to "nDi" to within ±5%. According to another embodiment, the interior finishing strip 36 has a length equal to "nDi" to within ±1%.

[0135] According to one embodiment, the inner finishing strip 36 covers the surface of the crown 3 and the second layer 22 over a width between 8 mm and 30 mm.

[0136] In one embodiment, the interior finishing strip 36 has a width between 3 cm and 8 cm. In another embodiment, the interior finishing strip 36 has a width of 4 cm plus or minus 5%. In another embodiment, the interior finishing strip 36 has a width of 4 cm plus or minus 1%.

[0137] In one embodiment, the outer finishing strip 35 is curved to best conform to the tubular shape 25 and avoid creases. The radius of curvature of the outer finishing strip 35 is, for example, between "5D e and "10D e "

[0138] According to one embodiment, the length of the outer finishing strip 35 is chosen so that said outer finishing strip can cover the entire outer strip 33, part of the crown 3 and part of the first layer 21. Figure 6 schematically represents this overlap.

[0139] According to one embodiment, the outer finishing strip 35 has a length equal to "irD e "To within plus or minus 5%. According to one embodiment, the exterior finishing strip 35 has a length equal to "irD e "To within plus or minus 1%."

[0140] According to one embodiment, the outer finishing strip 35 covers the surface of the crown 3 and the first layer 21 over a width between 8 mm and 30 mm.

[0141] In one embodiment, the exterior finishing strip 35 has a width between 4 cm and 10 cm. In another embodiment, the exterior finishing strip 35 has a width of 5 cm plus or minus 5%. In another embodiment, the exterior finishing strip 35 has a width of 5 cm plus or minus 1%.

[0142] The outer finishing strip 35 and the inner finishing strip 36 are made of materials similar to the connecting strips 26 and have a similar surface mass.

[0143] In one embodiment, the outer finishing strip 35 and the inner finishing strip 36 are fixed to the tubular form 25, which is inflated to approximately 1 bar of pressure. This method of mounting on an inflated tubular form allows for better tensioning of the outer finishing strip 35 and the inner finishing strip 36, thus preventing creases.

[0144] In one embodiment, the joining step (J3) is performed manually. In another embodiment, the joining step (J3) is performed using an automated system. The automated system includes a cutting tool capable of cutting rings 3, outer strips 34, inner strips 34, outer finishing strips 35, and inner finishing strips 36 from sheets of material. According to one embodiment, the machine includes grippers capable of handling the crowns 3, the outer strips 34, the inner strips 34, the outer finishing strips 35 and the inner finishing strips 36. According to one embodiment, the machine includes one or more glue coaters equipped with a dosing pump, and capable of gluing the crowns 3, the outer strips 34, the inner strips 34, the outer finishing strips 35, the inner finishing strips 36 and the first layer 21 and the second layer 22.According to one embodiment, the grippers of the automaton are able to bring into contact the crowns 3, the outer bands 34, the inner bands 34, the outer finishing bands 35, the inner finishing bands 36, the first layer 21 and the second layer 22 after gluing.

[0145] Referring to Figure 8, the manufacturing process includes an arrangement step (A1) of a valve 4 to permit the introduction of air into the inflatable tubular shape.

[0146] According to one embodiment, the valve 4 is arranged on the first layer 21. In this case, the arrangement step (A1) of the valve 4 is, for example, carried out after the cutting step (D1), after the removal step (E1) when the latter is carried out, and before the joining steps (J1), (J2), and (J3). Indeed, carrying out the arrangement step (A1) is facilitated when the joining steps (J1), (J2), and (J3) have not yet been performed.

[0147] According to one embodiment, the arrangement step (A1) includes a substep of drilling a hole in the first layer 21. The hole has, for example, a diameter between 20 mm and 50 mm. According to one embodiment, the hole has a diameter of 32 mm to within ±0.1%.

[0148] According to one embodiment, the assembly step (A1) includes a substep of cutting an eyelet from a sheet of material in a manner similar to the crown cutting step 3. The inner diameter of the eyelet is generally equal to the diameter of the hole to within ±5%, and the outer diameter of the eyelet is generally equal to the inner diameter of the eyelet plus twice an eyelet width ranging from 10 mm to 60 mm. The eyelet is made of materials similar to the connecting strips 26 and has a similar surface mass.

[0149] According to one embodiment, the assembly step (A1) includes a substep of airtight fixing of the eyelet to the outer surface of the first layer 21 around the hole. The fixing is carried out, for example, by gluing, heat-sealing, welding, or by any other joining method suitable to those skilled in the art.

[0150] When the fastening is achieved by gluing, the surfaces of the eyelet and the first layer 21 intended to be in contact are cleaned, possibly degreased, dried if these surfaces are damp, and then coated with adhesive before being pressed together. The adhesive is of the same type as that previously described. Similarly, a catalyst may be added to the adhesive. Thus, the first layer 21 is reinforced at the hole.

[0151] According to one embodiment, the assembly step (A1) includes a substep of cutting a second eyelet similar to the eyelet described above, followed by a step of airtightly fixing said second eyelet to the inner surface of the first layer 21 around the hole in a manner similar to the fixing of the eyelet described above. Thus, the first layer 21 is reinforced at the hole, both inside and out.

[0152] According to one embodiment, the assembly step (A1) includes a substep of mounting the valve 4 at the hole. This mounting step is carried out using conventional methods.

[0153] According to one embodiment, the valve 4 is arranged on said second layer 22. In this case, the valve arrangement step (A1) is, for example, carried out after the cutting step (D1), after the removal step (E1) when the latter is carried out, and before the joining steps (J1), (J2), and (J3). Indeed, carrying out the arrangement step (A1) is facilitated when the joining steps (J1), (J2), and (J3) have not yet been performed.

[0154] According to one embodiment, the arrangement step (A1) includes a substep of drilling a hole on the second layer 22 in a manner similar to the previously described embodiments of the valve 4 arranged on the first layer 21.

[0155] Also, and similarly to the previously described embodiments of the valve 4 arranged on the first layer 21, the arrangement step (A1) may include a substep of cutting an eyelet, a substep of fixing, airtight, said eyelet on the outer surface of the second layer 22 around the hole, and optionally, a substep of cutting a second eyelet similar to the previously described eyelet, and a step of fixing, airtight, said second eyelet on the inner surface of said second layer around the hole.

[0156] Finally, and similarly to the previously described embodiments of valve 4 arranged on the first layer 21, the arrangement step (A1) includes a substep of mounting valve 4 at the hole.

[0157] According to one embodiment, the valve 4 is arranged on one of the rings 4. In this case, the valve arrangement step (A1) is, for example, carried out before the joining step (J3). Indeed, the implementation of the arrangement step (A1) is facilitated when the joining step (J3) has not yet been carried out.

[0158] According to one embodiment, the arrangement step (A1) includes a substep of drilling a hole on one of the crowns 3 in a manner similar to the previously described embodiments of the valve 4 arranged on the first layer 21.

[0159] Also, and similarly to the previously described embodiments of the valve 4 arranged on the first layer 21, the arrangement step (A1) may include a substep of cutting an eyelet, a substep of fixing, airtight, said eyelet on an external surface of the ring 3 around the hole, and optionally a substep of cutting a second eyelet similar to the previously described eyelet, and a step of fixing, airtight, said second eyelet on an internal surface of said ring around the hole.

[0160] Finally, and similarly to the previously described embodiments of valve 4 arranged on the first layer 21, the arrangement step (A1) includes a substep of mounting valve 4 at the hole.

[0161] Another aspect of the invention relates to a tubular inflatable device 1. This tubular inflatable device 1 is that previously described in the description and an example of an embodiment of which is shown in figure 7. This tubular inflatable device 1 is, for example, intended for the protection of structures.

[0162] In particular, the tubular inflatable device 1 comprises the external tubular surface 251. This surface is formed, on the one hand, by the first airtight layer 21 of the drop-point structure 2. The first layer 21 has a length "L" and a width "I". The external tubular surface 251 is formed, on the other hand, by the airtight joint of the longitudinal ends of the first layer 21.

[0163] According to one embodiment, the tubular inflatable device 1 comprises, for the pair of abutting ends of the first layer 21, the first end-connecting strip 27 fixed airtight to said first layer. The first end-connecting strip 27 covers each of the abutting longitudinal ends of the first layer 21.

[0164] The tubular inflatable device 1 also includes the internal tubular surface 252. This internal surface is formed, on the one hand, by the airtight joint of the first-layer strips 221. These strips extend transversely over a length "L2" of the second layer 22 and across the entire width "I2" of said second layer. The second-layer strips 221 each have a width less than or equal to "L / (2TT) - e" and greater than or equal to "0.55 (L / (2TT) - e)". The internal tubular surface 252 is formed, on the other hand, by the airtight joint of the longitudinal ends of the second layer 22.

[0165] According to one embodiment, the second layer strips 221 each have a width "Ibi" equal to a predetermined strip width "lb" plus or minus 5%. The predetermined strip width "lb" is chosen to be less than or equal to "L / (2TT) - e", and greater than or equal to "0.55 ( L / (2TT) - e )".

[0166] According to one embodiment, the second layer strips 221 are regularly spaced along the length of the first layer 21.

[0167] According to one embodiment, the tubular inflatable device 1 comprises, for each pair of adjacent second layer strips 221, a connecting strip 26. The connecting strip 26 is fixed, in an airtight manner, to the second layer 22, and partially covers the width of each of the two adjacent second layer strips 221.

[0168] According to one embodiment, the joining step (J2) comprises, for the pair of abutting ends of the second layer 22, a second end joining strip 28 fixed, in an airtight manner, to said second layer. The second end joining strip 28 covers each of the abutting longitudinal ends of the second layer 22.

[0169] The tubular deformed inflatable device 1 further includes the set of wires 23, of the drop-point structure 2, connecting the first layer 21 to the second layer 22. The set of wires 23 is suitable for maintaining the first layer 21 at a distance "e" from the second layer 22 in the inflated condition.

[0170] The inflatable tubular device 1 further includes a crown 3, at each end of the tubular shape 25, sealing said end.

[0171] According to one embodiment, each ring 3 comprises the inner band 34 fixed, in an airtight manner, to the inner edge 32 of said ring. The inner band 34 forms an internal skirt fitted and fixed to the inside of the tubular form 25.

[0172] According to one embodiment, each ring 3 comprises the outer band 33 fixed, in an airtight manner, to the outer edge 31 of said ring. The outer band 33 forms an external skirt fitted and fixed to the outside of the tubular form 25.

[0173] In one embodiment, the tubular inflatable device 1 comprises, for each end of the tubular shape 25, an outer finishing strip 35 fixed airtight to the crown 3, the outer strip 33, and the first layer 21. The outer finishing strip 35 extends from the crown 3 to the first layer 21, overlapping the outer strip 33 over its entire outer periphery. The tubular inflatable device 1 also comprises, for each end of the tubular shape, an inner finishing strip 36 fixed airtight to the crown 3, the inner strip 34, and the second layer 22. The inner finishing strip 36 extends from the crown 3 to the second layer 22, overlapping the inner strip 34 over its entire inner periphery.

[0174] The inflatable tubular device 1 further includes the valve 4 suitable for allowing the introduction of air into the inflatable tubular shape 25, said valve being arranged on the first layer 21, or on the second layer 22, or on one of the crowns 3.

[0175] In one embodiment, the tubular inflatable device 1 includes an eyelet fixed to the outer surface of the element on which the valve 3 is mounted. The eyelet is fixed to the hole provided on which the valve 3 is mounted, said hole allowing the valve to be fitted. In another embodiment, the tubular inflatable device 1 includes a second eyelet fixed to the inner surface of the element.

[0176] According to one embodiment, the tubular inflatable device 1 is a fender.

[0177] According to one embodiment, the tubular inflatable device 1 is an urban protection.

Claims

DEMANDS 1. A method for manufacturing a tubular inflatable device comprising the following steps: • Supply (F1) of a drop-point structure (2) comprising: o A first airtight layer (21), of length "L" and width "I", o A second airtight layer (22), of initial length “l_2” equal to the length “L” of said first layer plus or minus 10%, and of width “I2” equal to the width “I” of said first layer plus or minus 10%, o A set of wires (23) connecting said first layer to said second layer, and capable of maintaining said first layer at a distance "e" from said second layer in an inflated condition, • Cutting (D1) of said second layer so as to form disjoint second layer strips (221) extending transversely to the initial length “L2” over the entire width “I2”, said second layer strips each having a width less than or equal to “L / (2TT) - e”, and greater than or equal to “0.55 ( L / (2TT) - e )”, • An airtight joint (J1) for each pair of adjacent second-layer strips (221) between an edge of a first second-layer strip (221) and an adjacent edge of the second second-layer strip (221), so as to curve said drop-point structure to obtain said tubular shape, said second layer forming an internal surface (252) of said tubular shape and said first layer forming an external surface (251) of said tubular shape; • An airtight joint (J2) between an edge of a first longitudinal end of said first layer and an edge of a second longitudinal end of said first layer, and between an edge of a first longitudinal end of said second layer and an edge of a second longitudinal end of said second layer, so as to longitudinally close said tubular shape. • An airtight joint (J3) at each end of said tubular form, connecting an inner edge (32) of an airtight ring (3) to a longitudinal edge of said second layer, and an outer edge (31) of said ring to a longitudinal edge of said first layer, so as to close, in an airtight manner, each of said ends of said tubular form; • An arrangement (A1) of a valve (4) on said first layer, or on said second layer, or on one of said rings, so as to permit the introduction of air into said inflatable tubular form. said process comprising for each wire (23) with free end opposite the cutouts (222, 223), a removal step (E) of a portion of at least 80% of the length of said wire.

2. Method according to claim 1, characterized in that the second layer strips (221) each have a width equal to a predetermined strip width "lb" to within 5%.

3. A method according to any one of the preceding claims, characterized in that the second layer strips (221) are regularly spaced over the length "L" of the first layer (21).

4. A method according to any one of the preceding claims, characterized in that the cutting step (D1) comprises making an end cut (223) extending transversely to the initial length "l_2" over the entire width "I2" at each of the longitudinal ends of the second layer (22).

5. A method according to any one of claims 1 to 3, characterized in that the cutting step (D1) comprises making a single end cut (223) extending transversely to the initial length "l_2" over the entire width "I2" at either of the longitudinal ends of the second layer (22).

6. A method according to any one of the preceding claims, characterized in that the joining step (J1) comprises, for each pair of adjoining second layer strips (221), the airtight fixing on the second layer (22) of an airtight connecting strip (26) partially covering the width of each of the two said adjoining second layer strips, said connecting strip extending along the adjoining edges (224) of said two adjoining second layer strips, over the entire width "I2" of said second layer to within 5%.

7. A method according to any one of the preceding claims, characterized in that the joining step (J2) comprises, for each pair of joined ends of the first layer (21), or of the second layer (22), the airtight fixing, on said first layer, respectively on said second layer, of an airtight end joining strip (27, 28), covering each of said joined ends, said end joining strip extending along the joined edges (215, 225) of said two ends, over the entire width "I" of said first layer to within 5%, respectively over the entire width "I2" of said second layer to within 5%.

8. A method according to any one of the preceding claims, characterized in that the joining step (J3) comprises, for each ring (3), the substeps of: • Airtight attachment, on said crown, of an airtight inner band (34), on the inner edge (32) of said crown so as to form an internal skirt intended to fit onto the inside of the tubular shape, • Airtight attachment, on said crown, of an airtight outer band (33) on the outer edge (31) of said crown so as to form an outer skirt intended to fit onto the outside of the tubular form.

9. Method according to claim 8 characterized in that the joining step (J3) comprises, for each crown (3), at the associated end of the tubular form, the substeps of: • Airtight fixing on the first layer (21) of the outer strip (33), • Airtight fixing on the second layer (22) of the inner strip (34).

10. A method according to claim 9 characterized in that the joining step (J3) comprises, for each end of the tubular shape, the substeps of: • Airtight fixing of an airtight outer finishing strip (35) on the crown (3), the outer strip (33) and the first layer (21), said outer finishing strip extending from said crown to said first layer, covering said outer strip over its entire outer periphery, • Airtight fixing of an airtight inner finishing strip (36) on said crown, the inner strip (34) and the second layer (22), said inner finishing strip extending from said crown to said second layer, covering said inner strip over its entire inner periphery.

11. Tubular inflatable device comprising: • An external tubular surface (251) formed by: o A first airtight layer (21) of a drop-point structure (2), said first layer having a length "L" and a width "I", and o The airtight joint of the longitudinal ends of said first layer, • An internal tubular surface (252) formed by: o The airtight joint of strips (221) of a second, airtight layer (22) of said drop-stitch structure, said second-layer strips extending transversely over a length "L2" of said second layer and over the entire width "I2" of said second layer, said second-layer strips each having a width less than or equal to "L / (2TT) - e" and greater than or equal to "0.55 (L / (2TT) - e)" and o The airtight joint of the longitudinal ends of said second layer, • A set of yarns (23), of said drop-stitch structure, connecting said first layer to said second layer, and capable of maintaining said first layer at a distance "e" from said second layer in inflated condition, each free-end yarn (23), opposite the joint of the longitudinal ends of the second layer, having a removal of a portion of at least 80% of the length of said yarn, • A crown (3), at each end of said tubular form, sealing said end of said tubular form, • A valve (4) suitable for allowing the introduction of air into said inflatable tubular form, said valve being arranged on said first layer, or on said second layer, or on one of said crowns.

12. Tubular inflatable device characterized in that said device is a fender.

13. Tubular inflatable device characterized in that said device is an urban protection.

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