Flying body

Abstract

To provide a flying body which can change the size of a shell and has a high strength.SOLUTION: This flying body comprises N (N is an integral number of 3 or more) girder materials extending in a horizontal direction, N joints, and a rotor provided at the tip of each of the girder materials, where the joints each has an intermediate connection part connected with the longitudinal intermediate part of one of the girder materials and an end connection part connected with the base end of the other one of the girder materials. The intermediate connection part can be connected with an arbitrary position in the longitudinal direction of one of the girder materials, being jointed with N pieces of the girder materials by means of N pieces of the joints, with the result that a base end girder part from the base end of each of the girder materials to the intermediate connection part forms a trunk of N-square frame shape in a plan view, and a tip girder part from the intermediate connection part of each of the girder materials to the tip projects outside from the trunk.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flying object that transports an object to be transported.

Background Art

[0002] In unmanned aerial vehicles (also referred to as UAVs, drones, etc.) that have become popular in recent years, various objects to be transported may be transported. The object to be transported is, for example, a tank for storing agricultural chemicals for agricultural chemical spraying, a container for storing luggage, or the like. These objects to be transported, such as tanks and containers, come in various sizes. Conventionally, a flying object having a fuselage corresponding to the size of the object to be transported has been used. However, the problem has been that manufacturing the fuselage each time according to the size of the object to be transported increases the manufacturing cost.

[0003] As a flying object whose fuselage size can be changed, for example, there is one shown in Patent Document 1. It has an annular airframe such as a quadrilateral or a triangle, and the frames constituting each side of the airframe expand and contract to change the size.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the flying object of Patent Document 1, since the frame is made to be telescopic, there is a risk that the strength may be reduced.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide a flying object whose fuselage size can be changed and which has high strength.

Means for Solving the Problems

[0007] The flying object of the present invention includes N struts (N is an integer of 3 or more) extending in the horizontal direction, N connectors, and rotors provided at the tips of the respective struts. The connector has an intermediate connection part connected to the middle part in the longitudinal direction of one strut and an end connection part connected to the base end of the other strut. The intermediate connection part can be connected at any position in the longitudinal direction of one strut. The N struts are connected by the N connectors, and the base end strut parts from the base ends of the respective struts to the intermediate connection parts form a frame-shaped body part in the shape of an N-sided polygon in plan view, and the tip strut parts from the intermediate connection parts of the respective struts to the tips protrude from the body part to the outer peripheral side.

[0008] Further, in the flying object of the present invention, the intermediate connection part has an intermediate connection part main body, an insertion hole formed in the intermediate connection part main body through which the strut is inserted, a groove part communicating the insertion hole with the outside of the intermediate connection part main body, and a fastener for tightening so as to narrow the width of the groove part. The end connection part has a pair of clamping parts for clamping the strut from a direction perpendicular to the longitudinal direction. One of the clamping parts may be integrally formed with the intermediate connection part main body, and the other clamping part may be bolted to one of the clamping parts.

Advantages of the Invention

[0009] According to the flying object of the present invention, by adjusting the connection position of the intermediate connection part of the connector to the strut, the size of the body part can be freely set according to the size of the object to be conveyed. And since it changes the joining position between the struts, it has higher strength compared to a case where the strut itself expands and contracts.

[0010] Further, if the intermediate connection part has an insertion hole and a groove part formed in the intermediate connection part main body and a fastener, with the strut inserted into the insertion hole, the connector can be moved along the longitudinal direction of the strut and tightened and fixed by the fastener at an arbitrary position, so that the adjustment of the connection position is easy. Also, if the end connection part clamps and bolts the strut with a pair of clamping parts from a direction perpendicular to the longitudinal direction, the tightening force acts uniformly on the entire connection part of the strut, so the bolt is less likely to loosen and the safety is higher.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0012] Hereinafter, the specific content of the flying object of the present invention will be described. This flying object is used for various purposes. The flying object of the first embodiment is used for pesticide spraying, has a tank for storing pesticides, and flies by remote control or automatic control. As shown in FIGS. 1 and 2, the flying object 100 includes a main body portion 110, a tank 200 which is an object to be conveyed, a holding portion 120 for holding the tank 200, and legs 130 for supporting the main body portion 110.

[0013] The main body portion 110 includes four girder members 1 extending in the horizontal direction, four connectors 2, and rotors 3 provided at one end of each girder member 1. In the girder member 1, the end where the rotor 3 is provided is the tip, and the opposite end is the base end.

[0014] The member 1 is made of a long circular pipe made of CFRP. All four members 1 have the same length and the same diameter.

[0015] As shown in FIGS. 3 and 4, the connector 2 has an intermediate connection portion 4 and an end connection portion 5. In the description of the connector 2, as shown in FIGS. 3 and 4, the front-rear, left-right directions are defined. The front-rear and left-right directions are all horizontal directions. The intermediate connection portion 4 is connected to the intermediate portion in the longitudinal direction of one member 1 and can be connected at any position in the longitudinal direction. The end connection portion 5 is connected to the base end of another member 1 and is connected so that the angle formed by the longitudinal direction of the other member 1 and the longitudinal direction of one member 1 is 90 degrees. That is, the connector 2 connects two members 1 so as to form a T shape.

[0016] The intermediate connection part 4 has an intermediate connection part main body 41, an insertion hole 42, a groove part 43, and a bolt 44 which is a fastening tool. The intermediate connection part main body 41 is made of metal and has a substantially cubic shape. The four side surfaces of the intermediate connection part main body 41 face the front, rear, left, and right directions respectively. The insertion hole 42 is a hole that penetrates the intermediate connection part main body 41 in the left - right direction (horizontal direction). The insertion hole 42 penetrates from the left - hand side surface to the right - hand side surface of the intermediate connection part main body 41. The insertion hole 42 is a hole through which the girder 1 is inserted, and its inner diameter is slightly larger than the diameter of the girder 1. On the rear - side surface of the intermediate connection part main body 41, a protrusion part 45 extending in the left - right direction is formed at the central part in the up - down direction. The protrusion part 45 has a substantially rectangular parallelepiped shape, the left - right length is the same as that of the intermediate connection part main body 41, the up - down length is shorter than that of the intermediate connection part main body 41, and it is integrally formed with the intermediate connection part main body 41. And a groove part 43 extending in the left - right direction is formed at the central part in the up - down direction of the protrusion part 45. The groove part 43 communicates the insertion hole 42 with the outside of the intermediate connection part main body 41. That is, the protrusion part 45 is divided by the groove part 43 into an upper upper - side protrusion part 451 and a lower lower - side protrusion part 452. Three through - holes 46 are formed in the upper - side protrusion part 451 at equal intervals in the left - right direction. The through - holes 46 penetrate the upper - side protrusion part 451 in the up - down direction. Three female screw parts 47 are formed at positions corresponding to the through - holes 46 in the lower - side protrusion part 452. The female screw parts 47 open on the upper surface of the lower - side protrusion part 452. And three bolts 44 which are fastening tools are respectively inserted into the through - holes 46 from above and screwed into the female screw parts 47. By screwing in the bolts 44, it is tightened so that the width of the groove part 43 is narrowed, and the girder 1 inserted into the insertion hole 42 and the intermediate connection part main body 41 are fixed. Note that female screw parts 48 for connecting the upper clamping parts 52 of the end connection part 5 described later are formed at the upper - left and upper - right parts of the front - side surface of the intermediate connection part main body 41. Also, a circular through - hole 49 penetrating in the front - rear direction is formed at the center of the front - side surface of the intermediate connection part main body 41.

[0017] The terminal connection part 5 has a pair of upper and lower clamping parts 51. Let the upper clamping part 51 be the upper clamping part 52, and the lower clamping part 51 be the lower clamping part 53. The lower clamping part 53 is integrally formed with the intermediate connection part main body 41. The upper clamping part 52 is separate from the lower clamping part 53 and the intermediate connection part main body 41.

[0018] The lower clamping part 53 has a lower clamping part main body 531, a recess 532, and a flange part 533. The lower clamping part main body 531 is made of metal and has a shape in which the upper surface of a rectangular parallelepiped is notched by a recess 532 extending in an arc shape in the front and rear directions and is substantially U-shaped when viewed from the front. The lower clamping part main body 531 has substantially the same front and rear length as the intermediate connection part main body 41, a slightly shorter left and right length, and a substantially half upper and lower length. The lower surface of the lower clamping part 53 and the lower surface of the intermediate connection part main body 41 are flush. The recess 532 has a shape in which the base end of the cross member 1 fits exactly. The flange part 533 is formed at the upper parts of the left and right side surfaces of the lower clamping part main body 531. The flange part 533 has a substantially rectangular parallelepiped shape and extends in the front and rear directions. The front and rear length is the same as that of the lower clamping part main body 531, the upper and lower length is shorter than that of the lower clamping part main body 531, and it is integrally formed with the lower clamping part main body 531. And the lower clamping part main body 531 and the flange part 533 are integrally formed with the intermediate connection part main body 41. On the left and right flange parts 533, three female screw parts 534 are formed side by side at equal intervals in the front and rear directions. The female screw part 534 opens to the upper surface of the flange part 533.

[0019] The upper clamping portion 52 has a shape that is substantially symmetric up and down with the lower clamping portion 53, and includes an upper clamping portion main body 521, a concave portion 522, and a flange portion 523. The upper clamping portion main body 521 is made of metal and has a shape in which the lower surface of a rectangular parallelepiped is notched by a concave portion 522 extending in a semi-circular arc shape back and forth, and is substantially reverse U-shaped when viewed from the front. The upper clamping portion main body 521 has substantially the same front-to-back length as the intermediate connection portion main body 41, is slightly shorter in the left-to-right length, and is approximately half in the up-and-down length. The concave portion 522 has a shape in which the base end of the cross member 1 fits exactly. The flange portion 523 is formed at the lower parts of the left and right side surfaces of the upper clamping portion main body 521. The flange portion 523 has a substantially rectangular parallelepiped shape and extends back and forth. The front-to-back length is the same as that of the upper clamping portion main body 521, the up-and-down length is shorter than that of the upper clamping portion main body 521, and it is integrally formed with the upper clamping portion main body 521. Three through holes 524 are formed in the left and right flange portions 523 in parallel at equal intervals back and forth. The through holes 524 penetrate the flange portion 523 vertically. In addition, through holes 525 for connecting to the intermediate connection portion main body 41 are formed at the upper left and upper right parts of the upper clamping portion main body 521. These through holes 525 penetrate the upper clamping portion main body 521 back and forth.

[0020] Then, the base end of the cross member 1 is clamped from above and below by the upper clamping portion 52 and the lower clamping portion 53. At this time, the base end of the cross member 1 is placed in the concave portion 532 of the lower clamping portion 53 and the concave portion 522 of the upper clamping portion 52. With the base end of the cross member 1 placed in the upper and lower concave portions 522, 532, the upper surface of the upper clamping portion 52 and the upper surface of the intermediate connection portion main body 41 are substantially flush, and there is a slight gap between the lower surface of the upper clamping portion 52 and the upper surface of the lower clamping portion 53. In this state, the upper clamping portion 52 is bolted to the lower clamping portion 53. Six bolts 54 are inserted into the through holes 524 of the upper clamping portion 52 from above and screwed into the female screw portion 534 of the lower clamping portion 53. By screwing in the bolts 54, the upper clamping portion 52 is tightened so as to approach the lower clamping portion 53, and the cross member 1 and the clamping portion 51 are fixed. In this state, the female screw portion 48 on the front side surface of the intermediate connection portion main body 41 communicates with the through hole 525 that penetrates the upper clamping portion main body 521 of the upper clamping portion 52 back and forth. A bolt 55 is inserted into this through hole 525 from the front and screwed into the female screw portion 48. Thereby, the upper clamping portion 52 is also bolted to the intermediate connection portion main body 41.

[0021] As described above, the intermediate connection portion 4 of the coupler 2 can be connected to an arbitrary position in the longitudinal direction of the girder member 1. In the examples shown in FIGS. 1, 2, and 5(a), the intermediate connection portion 4 is connected to substantially the center in the longitudinal direction of the girder member 1. Here, in the girder member 1, the portion from the base end to the intermediate connection portion 4 is defined as the base-end girder portion 11, and the portion from the intermediate connection portion 4 to the tip end is defined as the tip-end girder portion 12. That is, the sum of the lengths of the base-end girder portion 11 and the tip-end girder portion 12 is equal to the length of the girder member 1, and the lengths of the base-end girder portion 11 and the tip-end girder portion 12 change depending on the connection position of the intermediate connection portion 4. When connecting the four girder members 1, the lengths of the base-end girder portions 11 of the respective girder members 1 are made to coincide (and naturally the lengths of the tip-end girder portions 12 also coincide). In this way, when the four girder members 1 are connected by the four couplers 2, the four base-end girder portions 11 form a square (quadrilateral) frame shape in plan view. This frame-shaped portion is defined as the body portion 13. Then, the four tip-end girder portions 12 project outward from the body portion 13. Each tip-end girder portion 12 extends along the longitudinal direction of the base-end girder portion 11 from the four corner portions of the body portion 13. At this time, the four rotors 3 provided at the tips of the respective girder members 1 are arranged at the four vertices of the square S.

[0022] The holding part 120 is provided on the body part 13. The holding part 120 has two main holding beams 121, two sub-holding beams 122, and four holding part connectors 123. Both the main holding beam 121 and the sub-holding beam 122 are made of circular pipe materials made of CFRP. The main holding beam 121 and the sub-holding beam 122 have the same diameter and are thinner than the beam member 1. The main holding beam 121 extends in the horizontal direction and is horizontally spanned orthogonally to a pair of proximal beam parts 11 facing each other on the body part 13. The two main holding beams 121 are parallel to each other. The sub-holding beam 122 extends in the horizontal direction and is horizontally spanned orthogonally to the two main holding beams 121. The two sub-holding beams 122 are parallel to each other. That is, the main holding beam 121 and the sub-holding beam 122 form a ladder shape and are integrally formed. A substantially square frame-shaped portion in a plan view formed by the two main holding beams 121 and the two sub-holding beams 122 becomes a tank holding frame 126 for holding the tank 200. The holding part connector 123 connects the proximal beam part 11 and the main holding beam 121. The holding part connector 123 is made of metal and has a beam member connection part 124 having a hole through which the proximal beam part 11 can be inserted (penetrated) and a holding beam connection part 125 having a hole into which the end part of the main holding beam 121 can be inserted. However, the holding part connector 123 has a structure divided into two parts vertically and is fixed by being bolted to each other. The T-shaped proximal beam part 11 and the main holding beam 121 (in a state where the end surface of the main holding beam 121 abuts against the side peripheral surface of the proximal beam part 11) are sandwiched from above and below by the holding part connector 123 to connect the proximal beam part 11 and the main holding beam 121. The end parts of the two main holding beams 121 are each connected to the proximal beam part 11 by four holding part connectors 123, and the holding part 120 is provided on the body part 13. Since the proximal beam part 11 penetrates through the beam member connection part 124, the beam member connection part 124 can be connected to any position in the longitudinal direction of the proximal beam part 11.

[0023] The tank 200 is made of resin and, as shown in FIG. 1, has a substantially rectangular parallelepiped shape. However, the upper portions of a pair of opposing side surfaces of the tank 200 protrude outward, and the upper portion of the tank 200 is defined as the upper stage portion 201 and the lower portion thereof as the lower stage portion 202. In plan view, the cross-sectional shape of the lower stage portion 202 is substantially square, and the cross-sectional shape of the upper stage portion 201 is a substantially rectangular shape with two sides longer than those of the lower stage portion 202. The lower stage portion 202 is sized to fit exactly into the tank holding frame 126 of the holding portion 120. When the lower stage portion 202 of the tank 200 is inserted into the tank holding frame 126 from above, the lower end (the protruding portion) of the upper stage portion 201 engages with the two sub-holding beams 122 of the holding portion 120, and the tank 200 is held by the holding portion 120. Note that the tank 200 has an inlet for charging the pesticide into the tank 200 and a spraying device for spraying the pesticide in the tank 200, but both are not shown in the drawings.

[0024] The leg portion 130 is provided on the body portion 13. The leg portion 130 has two column members 131, two ground connection members 132, and two leg connectors 133. Both the column member 131 and the ground connection member 132 are made of circular pipes made of CFRP. The column member 131 and the ground connection member 132 have the same diameter and are thinner than the girder member 1. The column member 131 extends in the vertical direction (up and down direction). The ground connection member 132 extends in the horizontal direction. The lower end of the column member 131 and the longitudinal center of the ground connection member 132 are joined and integrally formed. That is, the column member 131 and the ground connection member 132 form an inverted T shape. The leg connector 133 connects the base end girder portion 11 and the column member 131 and is the same member as the holding portion connector 123. The leg connector 133 is made of metal and has a girder connection portion 134 having a hole through which the base end girder portion 11 can be inserted (penetrated) and a column connection portion 135 having a hole into which the upper end of the column member 131 can be inserted. However, the column connection portion 135 is located below the girder connection portion 134, and the leg connector 133 has a structure divided into two in the horizontal direction and is fixed by being bolted to each other. The base end girder portion 11 and the column member 131 arranged in a T shape (with the upper end surface of the column member 131 abutting against the side circumferential surface of the base end girder portion 11) are clamped by the leg connector 133 to connect the base end girder portion 11 and the column member 131. The two leg portions 130 are connected one by one to a set of base end girder portions 11 where the holding portion 120 is not provided, and the leg portions 130 are provided on the body portion 13. Since the base end girder portion 11 penetrates the girder connection portion 134, the girder connection portion 134 can be connected to any position in the longitudinal direction of the base end girder portion 11. Furthermore, since the column member 131 is a circular pipe, the direction around the longitudinal (vertical) axis is arbitrary. That is, the direction in which the ground connection member 132 joined to the column member 131 extends can be set arbitrarily. Here, as shown in Fig. 5(a), the front-rear, left-right directions of the flying object 100 are defined (different from the front-rear, left-right directions of the connectors in Figs. 3 and 4). That is, two sides of the square S formed by connecting the four rotors 3 are parallel to the front-rear direction, and the other two sides are parallel to the left-right direction. And a set of girder members 1 to which the holding portion 120 is connected are located front and rear, and a set of girder members 1 to which the leg portions 130 are connected are located left and right. The two leg portions 130 are connected such that the column members 131 are connected to the column connection portions 135 of the leg connectors 133 so that the respective ground connection members 132 extend in the front-rear direction.Further, the two legs 130 are connected to the base end girder portion 11 by leg connectors 133 such that the respective column members 131 are arranged side by side left and right (that is, the front - rear direction positions of the respective column members 131 coincide). In this way, the front - rear direction of the flying object 100 is specified by the direction of the ground contact member 132 of the legs 130.

[0025] Also, inside the fuselage 13, a housing 140 incorporating a control device, a communication device, and a battery is provided. The housing 140 has a rectangular parallelepiped shape and is fixed to the base end girder portion 11 by known means (not shown). The rotor 3 is connected to the control device and the battery. Also, a cover may be provided to cover the fuselage 13.

[0026] The above is the description of the configuration of each part of the flying object 100 of the first embodiment. And the flying object 100 configured in this way can freely set the size of the fuselage 13. To do so, the position where the intermediate connection portion 4 of the coupler 2 is connected to the girder member 1 is changed. For example, in the example shown in Fig. 5(a) (a reduced example), the intermediate connection portion 4 is connected to approximately the center in the longitudinal direction of the girder member 1, whereas in the example shown in Fig. 5(b) (an enlarged example), the intermediate connection portion 4 is connected closer to the tip than the center in the longitudinal direction of the girder member 1, and the fuselage 13 is larger. The fuselage 13 that is square in plan view is composed of each side by the base end girder portion 11. Therefore, the closer the connection position of the intermediate connection portion 4 is to the base end of the girder member 1, the shorter the base end girder portion 11 becomes, so the fuselage 13 becomes smaller, and the closer the connection position of the intermediate connection portion 4 is to the tip of the girder member 1, the longer the base end girder portion 11 becomes, so the fuselage 13 becomes larger.

[0027] In the enlarged example, a holding portion 120c having a size corresponding to the enlarged fuselage 13 is provided. Compared with the holding portion 120 in the reduced example, the length and interval of the main holding girders 121c and the length and interval of the sub - holding girders 122c are larger, and the tank holding frame 126c is larger, but the connection structure to the base end girder portion 11 is the same. In this way, in the enlarged example, since the fuselage 13 is enlarged, the tank holding frame 126c of the holding portion 120c can also be enlarged, so a larger tank can be held compared with the reduced example.

[0028] Even in the enlarged example, the front-back, left-right directions of the flying object 100 are determined based on the positions of the four rotors 3. And, similar to the case of the reduced example, the two leg portions 130 are provided such that the grounding member 132 extends in the front-back direction and the column members 131 are arranged side by side in the left-right direction.

[0029] According to the flying object 100 of the first embodiment, by adjusting the connection position of the intermediate connection portion 4 of the coupler 2 with respect to the girder member 1, the size of the fuselage portion 13 can be freely set according to the size of the tank 200. And, since it changes the joining position between the girder members 1, it has higher strength compared to the case where the girder member itself expands and contracts. Further, since the intermediate connection portion 4 has the insertion hole 42 and the groove portion 43 formed in the intermediate connection portion main body 41 and the bolt 44 which is a fastener, with the girder member 1 inserted into the insertion hole 42, the coupler 2 can be moved along the longitudinal direction of the girder member 1 and tightened and fixed by the bolt 44 at an arbitrary position, so that the adjustment of the connection position is easy. Also, since the end connection portion 5 bolts the girder member 1 by sandwiching it with a pair of sandwiching portions 51 from above and below, the tightening force acts uniformly on the entire connection portion of the girder member 1, so the bolt 54 is less likely to loosen and is safer. Further, since the tank 200 is attached only by inserting it into the tank holding frame 126 of the holding portion 120 from above, it is easy to attach and detach.

[0030] The flying object 100 of the first embodiment had four spar members 1. However, in the present invention, the number of spar members 1 may be any number as long as it is three or more. As shown in FIG. 6, the flying object 100a of the second embodiment has three spar members 1. However, FIG. 6 omits illustration of members other than the spar member 1, the connector 2a, and the rotor 3 (the holding part, the leg part, the housing). The spar member 1 and the rotor 3 are the same as those of the first embodiment. The connector 2a has the same structure for connecting the spar members 1 as in the first embodiment, but the angle formed by the longitudinal directions of the connected spar members 1 is different. When there are three spar members 1, the connector 2a connects the spar members 1 such that the angle formed by the longitudinal direction of the spar member 1 connected to the intermediate connection part 4a and the longitudinal direction of the spar member 1 connected to the end connection part 5a is 60 degrees. When the three spar members 1 are connected by such a connector 2a, a fuselage part 13a in the shape of an equilateral triangle is formed in plan view. And by changing the position where the intermediate connection part 4a of the connector 2a connects to the spar member 1, the size of the fuselage part 13a can be freely set. FIG. 6(a) shows the case where the intermediate connection part 4a is connected closer to the base end of the spar member 1, and FIG. 6(b) shows the case where the intermediate connection part 4a is connected closer to the tip of the spar member 1. In the latter case, the fuselage part 13a is larger. That is, similar to the first embodiment, the closer the connection position of the intermediate connection part 4a is to the base end of the spar member 1, the smaller the fuselage part 13a becomes, and the closer the connection position of the intermediate connection part 4a is to the tip of the spar member 1, the larger the fuselage part 13a becomes.

[0031] Also, as shown in FIG. 7, the flying object 100b of the third embodiment has six struts 1. However, FIG. 7 omits illustration of members other than the struts 1, the connectors 2b, and the rotors 3 (holding portions, leg portions, and housings). The struts 1 and the rotors 3 are the same as those of the first embodiment. The structure of the connectors 2b for connecting the struts 1 to each other is the same as that of the first embodiment, but the angles formed by the longitudinal directions of the connected struts 1 are different. When there are six struts 1, the connectors 2b connect the struts 1 to each other such that the angle formed by the longitudinal direction of the strut 1 connected to the intermediate connection portion 4b and the longitudinal direction of the strut 1 connected to the end connection portion 5b is 120 degrees. Note that the connector 2b of the third embodiment has the same shape as the connector 2a of the second embodiment and is used in a direction in which the inclination of the strut 1 is reversed. When the six struts 1 are connected by such connectors 2b, a body portion 13b in a regular hexagonal shape is formed in plan view. By changing the position where the intermediate connection portion 4b of the connector 2b is connected to the strut 1, the size of the body portion 13b can be freely set. FIG. 7(a) shows the case where the intermediate connection portion 4b is connected closer to the base end of the strut 1, and FIG. 7(b) shows the case where the intermediate connection portion 4b is connected closer to the tip of the strut 1. In the latter case, the body portion 13b is larger. That is, similar to the first embodiment, the closer the connection position of the intermediate connection portion 4b is to the base end of the strut 1, the smaller the body portion 13b becomes, and the closer the connection position of the intermediate connection portion 4b is to the tip of the strut 1, the larger the body portion 13b becomes.

[0032] According to the flying object 100a of the second embodiment and the flying object 100b of the third embodiment, the same operational effects as those of the flying object 100 of the first embodiment are achieved. Therefore, according to the size and shape of the tank 200 and other objects to be transported, or other various circumstances, the number of struts 1 can be freely selected.

[0033] The present invention is not limited to the above-described embodiments, and the shape and structure of each part can be appropriately changed within the scope of the gist of the invention. For example, the shape of the body part may be a polygon other than a regular polygon. For example, when the number of girder members is four, a rectangular body part may be formed by making the lengths of the opposing base end girder parts the same. The connecting tool may have an intermediate connecting part connected to the intermediate part in the longitudinal direction of the girder member and an end connecting part connected to the end of the girder member, and the shape of the intermediate connecting part and the end connecting part may be any shape. When the number of girder members is N, the connecting tool may be such that the angle formed by the longitudinal direction of the girder member connected to the intermediate connecting part and the longitudinal direction of the girder member connected to the end connecting part is (180 - 360 / N) degrees. The connecting tool may be such that the angle formed by the longitudinal direction of the girder member connected to the intermediate connecting part and the longitudinal direction of the girder member connected to the end connecting part is variable and can cope with cases where the number of girder members is different. The holding part may be such that the main holding girder and the sub-holding girder are telescopic so that they can be reused even when the body part is expanded or contracted. Since the holding part only needs to have sufficient strength to hold the object to be conveyed such as a tank, a telescopic structure can also ensure sufficient safety. The shape of the holding part can be appropriately set according to the shape of the object to be conveyed and the like. The shape of the leg part may be any shape as long as it can support the main body part. The object to be conveyed held by the holding part may be, in addition to a tank, a container for storing luggage or the like.

Explanation of Signs

[0034] 1 Girder member 2 Connecting tool 3 Rotor 4 Intermediate connecting part 5 End connecting part 11 Base end girder part 12 Tip end girder part 13 Body part 41 Intermediate connecting part main body 42 Insertion hole 43 Groove part 44 Bolt (fastening tool) 51 Clamping part

Claims

1. comprising N struts (N is an integer of 3 or more) extending in the horizontal direction, N connectors, and rotors provided at the tips of the respective struts, the connector has an intermediate connection portion connected to an intermediate portion in the longitudinal direction of one of the struts and an end connection portion connected to the base end of the other strut, and the intermediate connection portion can be connected at an arbitrary position in the longitudinal direction of one of the struts, the N struts are connected by the N connectors, and the base end strut portions from the base end to the intermediate connection portion of each strut form a frame-shaped body in the shape of an N-sided polygon in plan view, and the tip strut portions from the intermediate connection portion to the tip of each strut project from the body to the outer peripheral side, a flying object characterized by this.

2. the intermediate connection portion has an intermediate connection portion body, an insertion hole formed in the intermediate connection portion body through which the strut is inserted, a groove portion communicating the insertion hole and the outside of the intermediate connection portion body, and a fastener for tightening so as to narrow the width of the groove portion, the end connection portion has a pair of clamping portions for clamping the strut in a direction orthogonal to the longitudinal direction, one of the clamping portions is integrally formed with the intermediate connection portion body, and the other clamping portion is bolted to the one clamping portion, the flying object according to claim 1, characterized by this.

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