Parachutes, safety devices and aircraft equipped with them

Abstract

To provide a parachute having a float which can achieve buoyant force for a long time compared with conventional floats without being damaged when the parachute is deployed, and to provide a safety device including the parachute and an air vehicle.SOLUTION: A parachute 10 includes: a canopy 40 which forms a substantially semi-spherical shape when deployed; a double structure float member 52 having an outer bag member 60 formed by a cloth-like body, and an inner bag member 70 provided within the outer bag member 60 and formed by a film-like body. A vent hole 42 which opens when the canopy 40 is deployed is formed at a canopy top part of the canopy 40. The float member 52 is provided at an exterior part side of the vent hole 42. The inner bag member 70 has a suction port 71 connected to the vent hole 42, is expanded by air flowing thereinto through the vent hole 42 and the suction port 71 when the canopy 40 is deployed, and expands the outer bag member 60.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a parachute, a safety device including the same, and a flying object.

Background Art

[0002] Conventionally, parachutes have been widely used to lower a flying object or a falling object dropped from a flying object. Further, a parachute is also used as a safety device for reducing the risk of a falling accident of a drone (flying object). For example, in Patent Document 1, when an abnormality occurs during flight at sea and the flying object falls, a parachute deployment device provided with a float is disclosed for recovering a black box (a recording device such as a flight state) mounted on the flying object after landing on water.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0004] In the parachute deployment device of Patent Document 1 described above, a ball valve that functions as a check valve is provided at the intake port of the float, and air remains inside the float after landing on water, suppressing the intrusion of water and exerting buoyancy. However, when a cloth-like body made of a fiber material is used for the fabric of the float, there is a problem that the air inside the float easily escapes after landing on water, and it is difficult to exert buoyancy for a long time. Further, when a film-like body made of a resin film is used for the fabric of the float, the float may be damaged by the pressure at the time of deployment of the parachute and the float.

[0005] Therefore, the present invention has been made in view of these circumstances, and aims to provide a parachute having a float that does not break during deployment and can exert buoyancy for a longer period of time than conventional parachutes, a safety device equipped with the same, and an aircraft. [Means for solving the problem]

[0006] (1) The present invention relates to a parachute for a safety device attached to a payload, comprising: an umbrella-shaped body that becomes substantially hemispherical when deployed; an outer bag-shaped member formed of a cloth-like material; and a double-layered float member having an inner bag-shaped member formed of a film-like material and provided inside the outer bag-shaped member, wherein a vent opening that opens when deployed is formed at the top of the umbrella-shaped body, the float member is provided on the outside of the vent opening, and the inner bag-shaped member has an intake port connected to the vent opening, and when the umbrella-shaped body is deployed, air flows into the interior through the vent opening and the intake port, and the inner bag-shaped member is formed to be large enough to expand inside the outer bag-shaped member to a size greater than the size necessary to obtain buoyancy so that the safety device including the parachute and the payload do not sink in the liquid, and is formed to be able to expand to a shape that conforms to at least the inner surface of the outer bag-shaped member so as to limit the expansion so as not to burst. Furthermore, if the outer bag-like member is formed to be expandable into a spherical shape, and the inner bag-like member is formed to be expandable into a polyhedron or ellipsoid, then when the outer bag-like member is fully expanded, the radius of the spherical shape is r, and when the inner bag-like member is fully expanded, the shortest distance from the center of the polyhedron to the center of each face of the polyhedron, or the minor radius of the ellipsoid, then r ≤ h. The present invention is characterized by the following: Here, payload refers to, for example, an "aircraft," "luggage," or "measuring devices for measuring the environment, such as in the air or underwater."

[0009] ( 2 ) In the parachute described in (1) above 、 It is preferable that a check valve is provided in the aforementioned vent or intake port.

[0010] ( 3 ) the above( 2 In the parachute described above, it is preferable to further provide a center cord at the edge of the ventilation opening, the center cord having one end branching into multiple parts and being connected therefrom.

[0011] ( 4 ) The safety device of the present invention is as described above (1) to ( 3 The system comprises one of the following parachutes: a container for housing the parachute, and an ejection unit provided within the container for ejecting the parachute.

[0012] ( 5 ) The aircraft of the present invention comprises an airframe and the above-mentioned ( 4 The system comprises a safety device and one or more propulsion mechanisms coupled to the aircraft body for propelling the aircraft. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a parachute having a float that can exert buoyancy for a longer period of time than conventional parachutes without being damaged during deployment, a safety device equipped with the same, and an aircraft. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic cross-sectional view showing a safety device according to an embodiment of the present invention. [Figure 2] Figure 1 is a front view showing an aircraft equipped with a safety device, and it shows the state after the safety device has been activated. [Figure 3] Figure 2 is a schematic cross-sectional view showing the parachute in the safety device. [Figure 4] (a) is a perspective view showing the outer bag-like member according to an embodiment of the present invention in a fully expanded state, and (b) is a perspective view showing the inner bag-like member according to an embodiment of the present invention in a fully expanded state. [Figure 5] (a) is a plan view showing the outer bag-like member of Figure 4(a), and (b) is a plan view showing the inner bag-like member of Figure 4(b). [Figure 6] This figure illustrates the manufacturing process of an outer bag-like member according to an embodiment of the present invention. [Figure 7] This figure illustrates the manufacturing process of an inner bag-shaped member according to an embodiment of the present invention. [Figure 8] It is a diagram for explaining the manufacturing process of the inner bag-shaped member according to an embodiment of the present invention. [Figure 9] In the parachute of FIG. 3, it is a schematic partially enlarged cross-sectional view showing the state after water landing. [Figure 10] It is a schematic cross-sectional view showing the parachute according to the first modification of the present invention. [Figure 11] It is a schematic cross-sectional view showing the parachute according to the second modification of the present invention. [Figure 12] In the parachute of FIG. 11, it is a schematic partially enlarged cross-sectional view showing the state of the check valve after water landing.

Mode for Carrying Out the Invention

[0015] Hereinafter, a safety device equipped with a parachute according to an embodiment of the present invention will be described with reference to the drawings. Parachutes that can be used in the embodiments and modifications thereof shown below include, for example, "Flat Circular," "Conical," "Biconical," "Triconical," "Extended Skirt," "Hemispherical," "Guide Surface," "Annular," "Cross," "Flat Ribbon," "Conical Ribbon," "Ribbon," "Ring Slot," "Ring Sail," "Disc-Gap-Band," "Rotafoil," "Vortex Ring," and "Sandia RFD." Examples include those called RFD, Paracommander, Parawing, Parafoil, Sailwing, Volplane, and Ballute.

[0016] As shown in Figure 1, the safety device 100 according to this embodiment comprises a parachute 10, a bottomed cylindrical container 11 that houses the parachute 10, and an ejection unit 20 provided inside the container 11 that ejects the parachute 10 to the outside of the container 11. Here, the ejection unit 20 comprises a gas generator 21 having a cup-shaped case that houses an igniter (not shown), and a piston 24 having a recess 22 and a piston head 23 integrally formed with the recess 22. The parachute 10 (umbrella body 40 and float member 52 described later) is placed on the piston head 23 in a folded state. In the safety device 100 before operation, the parachute 10 is connected to the inside of the container 11 via a line 50 and a center cord 51 described later, and the line 50 and the center cord 51 are folded and stored inside the container 11 so as not to obstruct the movement of the piston 24 during operation. Furthermore, the open end of the container 11 is initially closed by the lid 12, and is designed to detach from the open end when the parachute 10 is pushed out.

[0017] Figure 2 illustrates a safety device 100 and an aircraft 30 to which the safety device 100 is applied. The aircraft 30 comprises a fuselage 31, a safety device 100 provided on the upper part of the fuselage 31, one or more propulsion mechanisms (e.g., propellers, etc.) 32 connected to the fuselage 31 and propelling the fuselage 31, and a plurality of legs 33 provided on the lower part of the fuselage 31. The aircraft 30 also includes an abnormality detection unit (not shown), such as an acceleration sensor. Note that the aircraft 30 in this embodiment is not limited to unmanned or manned aircraft such as drones, but also includes aircraft such as passenger planes and helicopters.

[0018] In this configuration, when an abnormality is detected by an abnormality detection unit such as an acceleration sensor, the piston 24 is propelled by the gas pressure generated based on the ignition operation of the gas generator 21. As a result, the parachute 10 can be directly pushed out and deployed by the thrust of the piston 24. Therefore, as shown in Figure 2, the deployed parachute 10 can suspend the aircraft 30 via the line 50 and the center cord 51.

[0019] Furthermore, as shown in Figures 2 and 3, the parachute 10 comprises a canopy 40, multiple lines 50, a center cord 51, and a float member 52.

[0020] As shown in Figure 3, the umbrella body 40 is a roughly hemispherical structure formed by connecting multiple gores, and has an umbrella edge portion 41 that constitutes an opening, and a ventilation opening 42 formed at the top. Multiple lines 50 are connected to the umbrella edge portion 41. The lines 50 are cable-like connecting members, one end of which is connected to the umbrella edge portion 41 and the other end of which is connected to the inside of the housing 11, and they support the aircraft 30 during descent. The center cord 51 is also a cable-like connecting member, one end of which branches into multiple parts and is connected to the periphery of the ventilation opening 42 and the other end of which is connected to the inside of the housing 11, and it also supports the aircraft 30 during descent. The ventilation opening 42 is made easier to open when the umbrella body 40, which has been ejected by the operation of the safety device 100, begins to open, as tension is applied to the lines 50 and the center cord 51.

[0021] Here, examples of Gore fabric include cloth-like bodies made from fibrous materials and film-like bodies made from resin films. From the viewpoint of the lightness of the umbrella body 40, it is preferable to use a film-like body that is lighter than a cloth-like body as the Gore fabric, and for example, resin films such as nylon, polyester, polyolefin, polyamide, polyimide, polyurethane, polyvinyl chloride, and polyurea can be used.

[0022] Furthermore, as shown in Figure 3, a double-layered float member 52 is provided on the outside of the top of the umbrella body 40, having an outer bag-like member 60 and an inner bag-like member 70 equipped with an air intake 71 connected to the ventilation opening 42. When the safety device 100 is activated, air flows into the inner bag-like member 70 from the air intake 71, causing the inner bag-like member 70 to expand, and the outer bag-like member 60 also expands to become a roughly spherical shape. As shown in Figure 4(a), the outer bag-like member 60 is formed to become a roughly spherical shape when fully expanded, and has an opening 61 at its bottom. A cloth-like material is used as the fabric for the outer bag-like member 60. Furthermore, for example, the inner bag-like member 70 is formed to be (1) large enough to expand inside the outer bag-like member 60 to obtain a predetermined buoyancy relative to the liquid (for example, enough buoyancy to prevent the safety device including a parachute and the aircraft equipped with the safety device from sinking in liquid (water such as the sea, rivers, or lakes)), and (2) large enough to expand to a shape that conforms to at least the inner surface of the outer bag-like member 60 so that the expansion is limited so as not to burst due to excessive expansion. Note that the shape that conforms to the inner surface of the outer bag-like member 60 includes not only the shape that conforms to the inner surface of the outer bag-like member 60 when the inner bag-like member 70 is at its maximum expansion, but also a state in which the inner bag-like member 70 does not expand to its maximum expansion (not a state in which it is fully expanded, but for example a state in which wrinkles (folds, folds, bumps, etc.) are formed on the surface of the inner bag-like member 70), and adheres to the inner surface of the outer bag-like member due to the air inflow during operation as described above. As a specific example, the inner bag-like member 70, as shown in Figure 4(b), is formed such that when fully expanded, each vertex becomes a smooth cube shape, and an air intake port 71 is provided on the bottom surface. The air intake port 71 also has a first opening 82 and a second opening 83, which will be described later. A film-like material is used as the fabric for the inner bag-like member 70.

[0023] Furthermore, the radius r of the sphere formed when the outer bag-like member 60 shown in Figure 5(a) is fully expanded is set to be smaller than the distance h from the center of the cube formed when the inner bag-like member 70 shown in Figure 5(b) is fully expanded. Therefore, when the safety device 100 is activated, the inner bag-like member 70 expands into a shape that conforms to the spherical shape of the outer bag-like member 60, as shown in Figure 3, due to the inflow of air from the air intake port 71. In this embodiment, the radius r of the spherical shape of the outer bag-like member 60 and the distance h from the center of the cube formed by the inner bag-like member 70 to the center of each face may be the same length. That is, in this embodiment, the above-mentioned r and h only need to satisfy the relationship r ≤ h.

[0024] Next, the manufacturing process of the float member 52 will be explained using Figures 6 to 8. First, the manufacturing process of the outer bag-like member 60 will be explained using Figures 6(a) and (b). As shown in the spherical approximation development diagram obtained using the boat-shaped polyconic projection in Figure 6(a), four identically shaped panel members 62A to 62D are cut from a fabric. Next, a portion of the lower part of each of the four panel members 62A to 62D is cut off to form the four boat-bottom shaped panel members 63A to 63D shown in Figure 6(b). Then, the adjacent curved parts of the four boat-bottom shaped panel members 63A to 63D are joined together by welding, sewing, adhesive, double-sided tape, etc., to form the roughly spherical outer bag-like member 60 shown in Figure 4(a). The diameter of the opening 61 of the outer bag-like member 60 is formed to match the diameter of the ventilation opening 42 of the umbrella body 40.

[0025] Next, the manufacturing process of the inner bag-like member 70 will be explained using Figures 7 and 8. First, as shown in Figure 7(a), two film members 72A and 72B of the same shape are cut from the fabric. Each of the two film members 72A and 72B has a roughly trapezoidal upper part 73a, 73b and lower part 77a, 77b, a square-shaped central part 75a, 75b, and a first intermediate part 74a, 74b and a second intermediate part 76a, 76b that are the same shape as the central part 75a, 75b.

[0026] Here, the fabric of the film members 72A and 72B can be a film-like body made using resin film, rubber film, etc. For example, as resin film, nylon, polyester, polyolefin, polyamide, polyimide, polyurethane, polyvinyl chloride, and polyurea are preferred. Also, as rubber film, for example, urethane rubber (U), tetrafluoroethylene propylene rubber (FEPM), vinyl methyl silicone rubber (VMQ), ethylene propylene diene rubber (EPDM), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), natural rubber (NR), and styrene butadiene rubber (SBR) are preferred.

[0027] Next, the film member 72B shown in Figure 7(a) is rotated 90 degrees clockwise around its central portion 75b so that the central portions 75a and 75b of film members 72A and 72B are superimposed, as shown in Figure 7(b). Then, the edges of the central portions 75a and 75b of film members 72A and 72B are welded together to join them.

[0028] Next, the first intermediate sections 74a, 74b and the second intermediate sections 76a, 76b of the film members 72A and 72B are folded along the fold line L1 shown in Figure 7(b), and the adjacent sides of the first intermediate sections 74a, 74b and the second intermediate sections 76a, 76b are welded together to join them.

[0029] Next, the upper parts 73a, 73b and lower parts 77a, 77b of the film members 72A and 72B are folded along the fold line L2 shown in Figure 7(b), and along the fold line L3. Then, adjacent sides of the upper parts 73a, 73b and lower parts 77a, 77b are welded together. This forms a cube 80 with an extension 81 on the bottom surface, as shown in Figure 8(a). The welding allowance for each side of the cube 80 and the extension 81 is set to, for example, 10 mm.

[0030] As shown in Figure 8(a), the extension 81 has a first opening 82 at one end on the bottom side of the cube 80 and a second opening 83 at the other end. Next, the extension 81 is folded back into the cube 80 at the position of the first opening 82, so that the second opening 83 is located inside the cube 80. As shown in Figure 8(b), when air flows in from the first opening 82, a rectangular prism-shaped air intake 71 is formed. That is, the inside and outside of the inner bag-like member 70 are in communication through the air intake 71 (first opening 82 and second opening 83). Next, the regions A enclosed by the dotted lines at each of the eight vertices of the cube 80 shown in Figure 8(b) are welded together to give each vertex a rounded shape. This forms an inner bag-like member 70 with a cubic shape where each vertex is smooth, as shown in Figure 4(b).

[0031] Next, glass cloth tape (not shown) is applied to each smooth vertex of the inner bag-like member 70 shown in Figure 4(b) to reinforce each vertex. Next, glass cloth tape (not shown) is applied to the periphery of the first opening 82 of the air intake port 71 of the inner bag-like member 70 to reinforce the lower periphery of the air intake port 71. Next, the periphery of the first opening 82 of the inner bag-like member 70 and the periphery of the opening 61 of the outer bag-like member 60 are temporarily fixed together with double-sided tape (not shown).

[0032] Next, glass cloth tape (not shown) is applied to the periphery of the first opening 82 of the inner bag-like member 70 and the opening 61 of the outer bag-like member 60 to reinforce the periphery of the air intake 71 and the opening 61. Then, the periphery of the opening 61 of the outer bag-like member 60 and the periphery of the vent 42 of the umbrella body 40 are temporarily fixed together with double-sided tape (not shown).

[0033] Then, the periphery of the first opening 82 of the inner bag-like member 70, the periphery of the opening 61 of the outer bag-like member 60, and the periphery of the ventilation opening 42 of the umbrella body 40 are sewn together using double-sided tape (not shown) to fix the inner bag-like member 70 to the outer bag-like member 60 and the umbrella body 40. This completes the parachute 10 equipped with a double-layered float member 52 having an outer bag-like member 60 and an inner bag-like member 70.

[0034] In the parachute 10 with the above configuration, when the umbrella body 40 and float member 52 are ejected to the outside of the containment 11 by the activation of the safety device 100, first, the multiple lines 50 and center cord 51 extend, the umbrella body 40 begins to unfold, and air begins to flow into the inside of the umbrella body 40. After that, once the lines 50 and center cord 51 are fully extended and taut, that is, once tension is applied to the lines 50 and center cord 51, the umbrella body 40 becomes fully open. At this time, the edge of the vent 42 is pulled downward by the center cord 51 in Figure 3, and also pulled radially outward from the center by the lines 50, causing the vent 42 and intake 71 to open, and air naturally flows into the inside of the inner bag-like member 70. Then, as more air flows into the inner bag-like member 70 through the vents 42 and intakes 71, the inner bag-like member 70 expands into a shape that conforms to the roughly spherical shape of the outer bag-like member 60, and as shown in Figure 3, the float member 52 unfolds into a roughly spherical shape. In the float member 52, the inner bag-like member 70 is provided inside the outer bag-like member 60 with a degree of freedom, so the outer bag-like member 60 expands rapidly in conjunction with the expansion of the inner bag-like member 70. In addition, as the outer surface of the inner bag-like member 70 expands, it comes into close contact with the inner surface of the outer bag-like member 60, which has relatively high strength, thus mitigating the impact when the float member 52 unfolds and preventing damage to the inner bag-like member 70.

[0035] Furthermore, upon landing on the water, the inflow of air into the umbrella body 40 stops, and as shown in Figure 9, the intake port 71 of the inner bag-like member 70 collapses due to its own weight, thus closing the vent port 42 and the intake port 71. In other words, the intake port 71 of the inner bag-like member 70 functions as a check valve. This prevents the air inside the inflated float member 52 from easily escaping to the outside, thereby suppressing water from entering the float member 52. Therefore, with the parachute 10, the float member 52 can maintain buoyancy for a long time after landing on the water, allowing the aircraft 30 to be easily recovered.

[0036] The embodiments of the present invention have been described above, but these are merely illustrative examples and do not particularly limit the present invention. Specific configurations and other aspects can be modified as appropriate. Furthermore, the functions and effects described in the embodiments of the invention are merely a list of the most preferred functions and effects resulting from the present invention, and the functions and effects according to the present invention are not limited to those described in the embodiments. For example, the following modifications are also conceivable. In the following modifications, symbols with the same last two digits are equivalent and therefore their explanation may be omitted. Also, parts that are not specifically described are the same as in the embodiments described above and therefore their explanation may be omitted.

[0037] (First variation) A first modified example of the float member 52 in the parachute 10 of the above embodiment will be described with reference to Figure 10.

[0038] As shown in Figure 10, the parachute 210 according to the first modified example comprises an umbrella body 240, a plurality of lines 250, a center cord 251, and a float member 252. The float member 252 has a double structure consisting of an outer bag-like member 260 and an inner bag-like member 270 having an air intake 271 connected to the vent 242. The outer bag-like member 260 is formed to be approximately spherical when fully inflated. The inner bag-like member 270 is formed to be a smooth cube when fully inflated. Furthermore, the radius of the sphere when the outer bag-like member 260 is fully inflated is set to be smaller than the distance from the center of the cube when the inner bag-like member 270 is fully inflated to the center of each face.

[0039] Furthermore, as shown in Figure 10, a check valve 290 comprising a hinge portion 291 and a plate member 292 is provided at the lower part of the air intake port 271 of the inner bag-shaped member 270. The plate member 292 is rotatably provided on the inner peripheral edge of the air intake port 271 via the hinge portion 291, as shown by the arrow in Figure 10. The plate member 292 can open freely inward of the inner bag-shaped member 270 via the hinge portion 291, but its rotation angle is limited so that it does not open outward (does not rotate into the interior of the umbrella body 240). Examples of materials for the plate member 292 include cloth, resin, rubber, and metal. In one modified example, the check valve 290 may be provided at the vent port 242.

[0040] In a float member 252 equipped with such a check valve 290, when the parachute 210 is deployed, the edge of the vent 242 is pulled downwards in Figure 10 by the center cord 251 and radially outward from the center by the line 250, causing the check valve 290 provided in the intake port 271 to open and close. Then, due to the further influx of air into the umbrella body 240, the plate member 292 is pushed inward into the inner bag-like member 270, the intake port 271 opens, air flows naturally into the inner bag-like member 270, and the inner bag-like member 270 expands into a shape that conforms to the roughly spherical shape of the outer bag-like member 260, causing the float member 252 to unfold into a roughly spherical shape. Furthermore, upon landing on the water, the inflow of air into the umbrella body 240 stops, and the air intake 271 is blocked by the weight of the check valve 290 (especially the plate member 292). As a result, the air inside the inner bag-like member 270 remains inside the inner bag-like member 270, preventing water from entering the inner bag-like member 270. Therefore, with the parachute 210, the float member 252 can maintain buoyancy for a long time after landing on the water, allowing the aircraft to be easily recovered.

[0041] (Second variation) A second modified example of the float member 52 in the parachute 10 of the above embodiment will be described with reference to Figures 11 and 12.

[0042] As shown in Figure 11, the parachute 310 according to the second modified example comprises an umbrella body 340, a plurality of lines 350, a center cord 351, and a float member 352. The float member 352 has a double structure consisting of an outer bag-like member 360 and an inner bag-like member 370 having an air intake 371 connected to the vent 342. The outer bag-like member 360 is formed to be approximately spherical when fully inflated. The inner bag-like member 370 is formed to be a smooth cube when fully inflated. Furthermore, the radius of the sphere when the outer bag-like member 360 is fully inflated is set to be smaller than the distance from the center of the cube when the inner bag-like member 370 is fully inflated to the center of each face.

[0043] Furthermore, a check valve 390 is provided at the air intake port 371 of the inner bag-like member 370. This check valve 390 comprises a net member 393, an inverted truncated square pyramidal portion 394 which takes on an inverted truncated square pyramidal shape when air flows in from the air intake port 371, and a relatively light, hollow plastic ball 395. The net member 393 is formed in a mesh-like structure that allows for airflow and is provided to cover the upper opening of the inverted truncated square pyramidal portion 394. The inverted truncated square pyramidal portion 394 has openings at the top and bottom, and the lower opening end is attached to the edge of the air intake port 371, allowing air flowing in from the air intake port 371 to pass through the inside. Inside the inverted truncated square pyramidal portion 394, the ball 395 is provided so as to be movable between the net member 393 and the vent port 342 and the air intake port 371. Furthermore, the diameter of the ball 395 is set to be larger than the diameters of the vent 342 and the intake 371.

[0044] In a float member 352 equipped with such a check valve 390, when the parachute 310 is deployed, first, the ball 395, which is propelled by the air flowing into the umbrella body 340, moves towards the net member 393. Subsequently, air flows into the inverted truncated square pyramidal section 394 from the vent 342 and intake 371, forms an inverted truncated square pyramidal shape, passes through, and is taken into the inner bag-like member 370. Then, as the inner bag-like member 370 expands into a shape that mimics the roughly spherical shape of the outer bag-like member 360, the float member 352 unfolds into a roughly spherical shape. Furthermore, upon landing on the water, the inflow of air into the umbrella body 340 stops, and as shown in Figure 12, the inverted truncated square pyramidal section 394 and the net member 393 collapse under their own weight, and the ball 395 blocks the vent 342 and intake 371. This prevents the air inside the inflated float member 352 from easily escaping to the outside, thus suppressing water from entering the float member 352. Therefore, with the parachute 310, the float member 352 can maintain buoyancy for a long time after landing on the water, allowing the aircraft to be easily recovered.

[0045] Furthermore, in the above embodiments and modifications, the case in which the inner bag-like member is formed so that each vertex becomes a smooth cubic shape when fully expanded has been described. However, each vertex does not necessarily have to be smooth; for example, each vertex may have corners. Also, the shape of the inner bag-like member when fully expanded is not limited to a cubic shape. For example, it may be a polyhedron shape (including regular polyhedra) such as a rectangular prism, octahedron, dodecahedron, or icosahedron, an ellipsoid, a sphere, or a substantially spherical shape.

[0046] In the float member according to the present invention, for example, if the outer bag-like member is formed to be approximately spherical when fully expanded, and the inner bag-like member is formed to be polyhedral when fully expanded, it is preferable that the radius r1 of the sphere and the shortest distance h1 from the center of the polyhedron to the center of each face of the polyhedron satisfy the relationship r1 ≤ h1.

[0047] Furthermore, in the float member according to the present invention, for example, if the outer bag-like member is formed to have a substantially spherical shape when fully expanded, and the inner bag-like member is formed to have an ellipsoidal shape when fully expanded, it is preferable that the radius r2 of the sphere and the minor radius h2 of the ellipsoid satisfy the relationship r2 ≤ h2.

[0048] Furthermore, in the float member according to the present invention, for example, if the outer bag-shaped member is formed to have a substantially spherical shape when fully expanded, and the inner bag-shaped member is formed to have a substantially spherical shape when fully expanded, it is preferable that the volume of the inner bag-shaped member when fully expanded is at least 1 times the volume of the outer bag-shaped member when fully expanded. Also, for example, if the outer bag-shaped member is formed to have a substantially spherical shape when fully expanded, and the inner bag-shaped member is formed to have a cubic shape when fully expanded, it is preferable that the volume of the inner bag-shaped member when fully expanded is at least 1.2 times the volume of the outer bag-shaped member when fully expanded.

[0049] Furthermore, in the above embodiments and their modifications, the vents of the umbrella body and the intake ports of the float members are configured to be formed in the same part, but they do not necessarily have to be in the same part. For example, the intake port may be installed so as to seal and cover the outer perimeter of the vents, and a check valve may be installed in either the vents or the intake ports.

[0050] Furthermore, while the above embodiments and modifications describe a case where a center cord is connected to the periphery of the vents of the umbrella body, a center cord is not necessarily required for the parachute.

[0051] Furthermore, while the above embodiments and modifications describe cases where the other end of the line and center cord is connected inside the housing, the invention is not limited to this, and for example, it may be connected outside the housing or to the aircraft body.

[0052] Furthermore, while the above embodiments and modifications show examples in which a safety device is attached to the aircraft, the invention is not limited to these examples. For instance, when dropping cargo onto water from an aircraft, the safety device according to the present invention can also be attached to the cargo or measuring device before it is dropped. [Explanation of symbols]

[0053] 10, 210, 310 parachutes 11 containers 12 Lid 20 Injection part 21 Gas generator 22 recess 23 Piston Head 24 pistons 30 flying objects 31 aircraft 32 Propulsion mechanism 33 Legs 40, 240, 340 Umbrella Body 41, 241, 341 Umbrella edge 42, 242, 342 vents 50, 250, 350 lines 51, 251, 351 Center Code 52, 252, 352 Float members 60, 260, 360 Outer bag-like member 61 Opening 62A, 62B, 62C, 62D Panel members 63A, 63B, 63C, 63D: Boat-shaped panel members 70, 270, 370 Inner bag-shaped member 71, 271, 371 Air intake 72A, 72B Film component 73a, 73b upper part 74a, 74b 1st intermediate part 75a, 75b center 76a, 76b 2nd intermediate part 77a, 77b bottom 80 cubes 81 Extension part 82 First opening 83 Second opening 100 safety equipment 290, 390 Check valve 291 Hinge section 292 Plate members 393 Net components 394 Inverted square pyramid frustum 395 balls Area A L1, L2, L3 fold lines

Claims

1. A parachute for a safety device attached to a payload, The umbrella-like body, which becomes roughly hemispherical when unfolded, A double-layered float member having an outer bag-like member formed of a cloth-like material and an inner bag-like member provided inside the outer bag-like member and formed of a film-like material, Equipped with, The umbrella body has a ventilation opening at its top that opens when unfolded. The float member is provided on the outside side of the vent, The inner bag-like member has an air intake connected to the vent, and when the umbrella is deployed, air flows into the interior through the vent and the air intake, and is formed to expand inside the outer bag-like member to a size greater than the size necessary to obtain buoyancy so that the safety device, including the parachute, and the payload do not sink in the liquid, and is formed to expand to a shape that conforms to at least the inner surface of the outer bag-like member so that the expansion is limited so as not to burst. When the outer bag-like member is formed to be expandable into a spherical shape, and the inner bag-like member is formed to be expandable into a polyhedral or ellipsoidal shape, A parachute characterized in that, when the outer bag-like member is fully expanded, the radius of the spherical shape is r, and when the inner bag-like member is fully expanded, the shortest distance from the center of the polyhedron to the center of each face of the polyhedron or the minor radius of the ellipsoid is h, then r ≤ h.

2. The parachute according to claim 1, characterized in that a check valve is provided in the vent or the intake port.

3. The parachute according to claim 2, further comprising a center cord at the edge of the vent, one end of which branches into multiple parts and is connected therefrom.

4. A parachute according to any one of claims 1 to 3, A container for storing the aforementioned parachute, A launching unit for launching the parachute is provided inside the aforementioned containment, A safety device characterized by being equipped with the following features.

5. The payload is an aircraft, The aircraft and, The safety device described in claim 4, provided on the aforementioned aircraft, An aircraft characterized by comprising one or more propulsion mechanisms coupled to the aircraft and propelling the aircraft.

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