JP2002191722A - Hollow body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow body which can be expanded without using an air pump. SOLUTION: A side surface 14 between a bottom plate 12 and a top plate 13 is formed of a vinyl. On the internal surface 21 of a ball main body 11, a spiral skeleton 22 is extended circumferentially. Thus, this hollow body is constituted in a manner to be stretchable in the vertical direction between a contracted state wherein the top plate 13 is close to the bottom plate 12, and a stretched state wherein the top plate 13 is away from the bottom plate 12. Then, an opening 31 which communicates with the inside is provided on the top plate 13. The opening 31 is constituted in a manner closable with a cap 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hollow body having a hollow main body.

[0002]

2. Description of the Related Art Conventionally, when deploying a hollow body in a contracted state, a method of operating the air supply to pump air to increase the internal pressure has been used to deploy the hollow body. .

[0003]

However, in such a case, it is necessary to inflate the air, and if there is no air, there is a problem that the air bag cannot be deployed.

[0004] The present invention has been made in view of such conventional problems, and has as its object to provide a hollow body that can be deployed without using an air tank.

[0005]

According to a first aspect of the present invention, there is provided a hollow body having flexibility which can expand and contract between a contracted state and an expanded state. The main body is provided with an opening communicating with the inside thereof, and a deformation suppressing means for suppressing deformation toward the center side in a direction intersecting the expansion and contraction direction, and arbitrarily forming a closed state in which the opening is closed to form an internal pressure. Closing means are provided to prevent leakage of fluid from the opening due to changes.

That is, when expanding the contracted hollow body, the main body is extended in the extension direction. At this time, the main body is provided with deformation suppressing means for suppressing deformation toward the center side in the direction intersecting the expansion / contraction direction, and the shape in the intersecting direction intersecting the extension direction is maintained. Accordingly, the volume inside the main body is increased by the extent of the expansion, and a fluid such as gas flows in from an opening provided in the main body.

In this state, the opening is closed by closing means. Then, leakage of the fluid from the opening due to a change in the internal pressure of the main body is prevented, and the shape of the main body is maintained.

Further, in the hollow body according to the second aspect, a plurality of the openings and the closing means corresponding to the openings are provided.

Thus, by providing a plurality of the openings, the flow area of the fluid can be expanded.

Further, in the hollow body according to the third aspect, the closing means is constituted by an opening / closing member which selectively forms the open state where the opening is opened and the closed state.

That is, the closing means can selectively form not only the closing of the opening but also an open state in which the opening is opened. Therefore, by forming the open state and discharging the fluid inside, the main body is deformed into a contracted state.

Further, in the hollow body according to the fourth aspect, the deformation suppressing means is constituted by a skeleton extending along a side surface of the main body.

Thus, the main body can be made of vinyl or the like which is soft and airtight and watertight and can be easily processed into a bag shape or the like.

Further, in the hollow body according to claim 5, the skeleton is constituted by arranging a plurality of independent skeleton members.

That is, by forming the skeleton by arranging a plurality of independent skeleton members, the skeleton can be expanded in the expanded state.
The shape of the part where each skeleton member is arranged is determined.

In addition, in the hollow body according to claim 6, the skeleton is formed in a spiral shape.

Thus, the shape of the main body at the time of development is determined by one skeleton. Further, when one rod-shaped member is formed in a spiral shape, tension is generated in the spiral skeleton in a direction spreading outward.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a beach ball 1 as a hollow body according to the present embodiment, wherein (a) shows a perspective view and (b) shows a cross-sectional view.

That is, FIG. 1 shows a state in which the beach ball 1 is deployed, and is configured to be spherical when deployed. The ball body 11 includes a bottom plate 12 forming a bottom portion and a top plate 13 forming a top portion, and both plates 12 and 13 are spherically curved.
The side surface 14 between the plates 12 and 13 is formed of soft vinyl, and the edge of the vinyl is
It is formed in a hollow shape by being bonded to the edges of the two plates 12 and 13.

On the inner surface 21 of the ball body 11, a skeleton 2 formed by spirally winding a plastic rod-shaped member is provided.
2 extend in the circumferential direction along the side surface and are bonded at equal intervals up and down, and the inner diameter at the center between the bottom plate 12 and the top plate 13 is set to be the largest. .
The skeleton 22 has one end fixed to the bottom plate 12 and the other end fixed to the top plate 13, and constitutes a deformation suppressing means for suppressing deformation of the side surface 14 toward the center.
Thereby, the top plate 13 is configured to be able to expand and contract in the vertical direction in FIG. 1 between a state where the top plate 13 is contracted close to the bottom plate 12 and a state where the top plate 13 is extended away from the bottom plate 12. ing.

In the center of the top plate 13, a circular opening 31 communicating with the inside is formed.
1 is configured such that a cap 32 as an opening / closing member is detachably attached. The cap 32
Comprises a fitting portion 33 fitted into the opening portion 31 to close the opening portion 31, and a base portion 34 having a flange extending laterally from the fitting portion 33, and the fitting portion 33 is connected to the opening portion 31. The opening 31 is closed in a state of being fitted into the
The configuration is such that leakage of air from the opening 31 due to a change in the internal pressure of the ball body 11 can be prevented. Thus, a closed state in which the opening 31 is closed by the cap 32 and an open state in which the opening 31 is opened by removing the cap 32 can be selectively formed.

In the present embodiment having the above-described configuration, when the beach ball 1 in the contracted state in the initial stage is developed, the bottom plate 12 of the ball body 11 and the top plate 1
Spread 3 up and down with both hands. At this time, the ball body 11 is provided with a skeleton 22 that suppresses deformation toward the center in the radial direction intersecting the expansion / contraction direction, and the shape in the radial direction intersecting the extension direction is maintained. As a result, the volume inside the ball body 11 increases by the extent of the expansion, and air flows in from the opening 31 provided in the top plate 13 of the ball body 11.

As described above, the ball body 11 in the contracted state
Only by extending the air, air can flow into the interior,
The beach ball 1 can be expanded and expanded. Therefore, in comparison with the conventional beach ball 1 in which air is pressure-fed into the inside and deployed, it is not necessary to inflate or the like, and the beach ball 1 can be deployed independently without depending on others.

Of course, if desired, the internal pressure can be further increased by additionally using other air injection means.

In this state, the opening 31 is closed with the cap 32. Then, leakage of air from the opening 31 due to a change in the internal pressure of the ball body 11 is prevented, and the beach ball 1 can be kept spherical.

When not in use, the cap 32 is removed from the opening 31 of the top plate 13 and the opening 31 is opened. Thereby, the air in the ball body 11 can be discharged, so that the beach ball 1 can be deformed into a contracted state. Therefore, compactness becomes possible, and portability and storability can be improved.

On the other hand, in order to prevent inward deformation, the ball body 1
It is constituted by a skeleton 22 extending along one side surface 14. For this reason, the ball main body 11 can be made of vinyl, which is soft and air-tight and water-tight, and can be easily processed into a bag shape or the like, and can be easily manufactured.

In addition, by forming the skeleton 22 in a spiral shape, the shape of the main body at the time of development can be determined by one skeleton 22. In addition, since one rod-shaped member is formed in a spiral shape, tension can be generated in the spiral skeleton 22 in a direction to spread outward, which can contribute to maintaining the shape of the ball body 11.

(Second Embodiment)

FIG. 2 shows a floating ring 41 as a hollow body according to a second embodiment of the present invention.
FIG. 3B is a perspective view showing a cross section of a main part.

That is, FIG. 2 shows a state in which the floating ring 41 is expanded, and is configured to form a donut shape in the expanded state. The floating ring 41 includes a first end member 51 forming one end and a second end member 52 forming the other end. The two members 51 and 52 are made of plastic and have a circular plate-shaped bottom 53.
And a side wall portion 54 rising from the peripheral edge of the bottom portion 53 to form a container. The side surface 56 of the floating ring main body 55 that forms the space between the two members 51 and 52 is formed of soft vinyl, and the edge of the vinyl is bonded to the side walls 54 and 54 of the two members 51 and 52. Have been.
A hook-and-loop fastener 57 that engages with each other is provided on each bottom 53 of the two members 51 and 52 (only one is shown) so that the bottoms 53 of the two members 51 and 52 can be detachably connected to each other. It is configured. Thereby, it is configured such that a donut shape can be formed in a state where the two members 51 and 52 are connected (in FIG. 2, both members 5 and 52 are connected).
1 and 52 are shown separated).

A skeleton 62 extending along the circumferential direction of the side surface 56 is provided on the inner side surface 61 of the floating ring main body 55, and constitutes deformation suppressing means for suppressing deformation of the side surface to the inside. The skeleton 62 is composed of a skeleton member 63 in which a thin line of a hard plastic is formed in a ring shape, and the skeleton members 63 are bonded at equal intervals. Thereby, the floating ring main body 55 is configured to be able to expand and contract between a state in which the side surface 56 between the two members 51 and 52 is contracted in the length direction and an extended state in which the side surface 56 is extended in the length direction. I have.

Then, the side wall portions 54 of the two members 51 and 52,
A circular opening 71, 71 communicating with the inside is opened in 54, and a cap 72 as an opening / closing member is detachably attached to each of the openings 71, 71. . The cap 72 is fitted into the opening 71 and a fitting portion 72 a for closing the opening 71.
And a base portion 73 having a flange extending laterally from the fitting portion 72a. The opening portion 71 is closed with the fitting portion 72a fitted into the opening portion 71, and the internal pressure of the floating ring main body 55 changes. The configuration is such that leakage of air from the opening 71 due to the above can be prevented. Thus, a closed state in which the opening 71 is closed by the cap 72 and an open state in which the opening 71 is opened by removing the cap 72 can be selectively formed.

In the present embodiment having the above structure, when the floating ring 41 in the contracted state is developed at the initial stage, the first and second end members 5 of the floating ring main body 55 are required.
Spread 1,52 with both hands and stretch to make a ring. At this time, the floating ring main body 55 is provided with a skeleton 62 for suppressing deformation to the radial center side intersecting the expansion / contraction direction, and the shape in the radial direction intersecting the extension direction is maintained. As a result, the volume inside the floating ring 41 is increased by an amount corresponding to the expansion, and air flows in from the openings 71 provided on the side walls 54 of the members 51 and 52 of the floating ring main body 55.

In this manner, air can flow into the interior simply by expanding the floating ring main body 55 in the contracted state, and the floating ring 41 can be expanded and deployed. Therefore, as compared with the conventional floating wheel 41 in which the air is pressure-fed into the inside and deployed, the air-filling or the like becomes unnecessary, and the deployment can be performed independently without depending on others.

The openings 71 and 7 through which air flows are provided.
1 is formed at two places, a first end member 51 and a second end member 52. Thereby, compared with the case where the opening 71 is formed at only one place, the air flow area can be expanded, the load when the main body is extended is reduced, and the deployment time is shortened. be able to.

In this state, the two members 51, 52 at the end of the floating ring main body 55 are connected to each other by the hook-and-loop fastener 57 of the bottom 53 to form a donut shape, and the openings 71, 71 are closed by caps 72, 72. To close. Then, leakage of air from the openings 71, 71 due to a change in the internal pressure of the floating ring main body 41 is prevented, and the floating ring 41 can be maintained in a donut shape. In addition, since air leakage in the floating ring main body 55 can be prevented, buoyancy can be obtained.

When not in use, the two members 51,
The caps 73, 73 are removed from the openings 71, 71 of the 52, and the openings 71, 71 are opened. Thereby, the air in the floating ring main body 55 can be exhausted, so that the floating ring 4
1 can be transformed into a contracted state. Therefore, compactness becomes possible, and portability and storability can be improved.

On the other hand, the inward deformation is prevented by the floating ring main body 55.
Is constituted by a skeleton 62 extending along the side surface 56. For this reason, the floating ring main body 55 can be made of vinyl, which has flexibility and airtightness and watertightness, and can be easily processed into a cylindrical shape or the like, and can be easily manufactured.

In addition, by forming the skeleton 62 by arranging a plurality of independent skeleton members 63, it is possible to determine the shape of the portion where each skeleton member 63 is arranged in the unfolded state. Thereby, the design at the time of development can be improved.

(Third Embodiment)

FIG. 3 is a view showing a cross section of a floating ring 81 as a hollow body according to a third embodiment of the present invention, and shows an expanded state.

That is, the floating ring 81 is configured so as to form a donut shape in an expanded state, and the floating ring 81 has a bottom plate 91 in the shape of a circular ring plate forming the bottom.
And a top plate 92 having the same shape. Both plates 91, 92
Between the inner edges of the inner peripheral surface 9
The outer peripheral surface 94 is formed of soft vinyl between the outer edges of the two plates 91 and 92. Thereby, the two plates 91 and 92 and the two peripheral surfaces 9 are formed.
3, 94 form a hollow donut-shaped floating ring main body 95.

The inner surface 1 of the inner peripheral surface 93 and the outer peripheral surface 94
Each of the peripheral surfaces 93, 9 is provided with a skeleton 103 extending along the circumferential direction of the floating ring main body 95.
Deformation suppressing means for suppressing the deformation of the inner surface 4 is formed. Thereby, the floating ring main body 95 moves vertically in FIG. 3 between the state in which the top plate 92 is contracted close to the bottom plate 91 and the state in which the top plate 92 is extended away from the bottom plate 91. It is configured to be able to expand and contract.

The skeleton 103 is made up of an inner skeleton member 111 and an outer skeleton member 112 in which thin plastic wires are formed in a ring shape. The inner skeleton member 111 provided on the inner peripheral surface 93 is It is formed smaller in diameter than the exoskeleton member 112 provided on the outer peripheral surface 94. A plurality of these skeletal members 111 and 112 are provided vertically at equal intervals, and are fixed by an adhesive. An inner skeleton member 111 provided on the inner peripheral surface 93,.
Is configured so that the diameter of the inner skeleton member 111 disposed at the center between the bottom plate 91 and the top plate 92 is minimized, and the center is bulged inside the floating ring 1. Have been. The outer skeleton members 112,... Provided on the outer peripheral surface 94 are set so that the diameter of the exoskeleton member 112 arranged at the center between the bottom plate 91 and the top plate 92 is the largest. The central portion is configured to bulge out of the floating ring 1.

The top plate 92 is provided with a plurality of screw holes 121,... As openings communicating with the inside, and each of the screw holes 121,. Are screwed into the caps 122,... As members. The screw cap 122 includes a screw portion 122a that is screwed into the screw hole 121 to close the screw hole 121, and a head portion 123. The head portion 123 is inserted with a flathead screwdriver or a coin. A groove 124 for turning is formed. Thereby, the screw hole 121 is closed with the screw portion 122a screwed into the screw hole 121,
The configuration is such that leakage of air from the screw hole 121 due to a change in the internal pressure of the floating ring main body 95 can be prevented. In addition, a closed state in which the screw hole 121 is closed by the screw cap 122 and an open state in which the screw hole 121 is opened by removing the screw cap 122 can be selectively formed.

In the present embodiment having the above-described configuration, when the floating ring 81 in the contracted state is developed in the initial stage, the bottom plate 91 and the top plate 92 of the floating ring main body 95 are spread and extended with both hands. At this time, the hollow floating ring main body 95 is provided with a skeleton 103 that suppresses deformation in the horizontal center side intersecting the expansion and contraction direction, that is, in the direction to reduce the diameter of the donut-shaped annular cross section. Is maintained. Accordingly, the volume inside the floating ring 81 is increased by an amount corresponding to the expansion, and air flows in from the screw holes 121 provided in the top plate 92 of the floating ring main body 95.

As described above, air can flow into the interior simply by expanding the floating ring main body 95 in the contracted state, and the floating ring 81 can be expanded and deployed. Therefore, as compared with the conventional floating ring 81 in which the air is pressure-fed into the inside and deployed, the air-filling or the like becomes unnecessary, and the deployment can be performed independently without depending on others.

The screw holes 121, through which air flows,
Are formed at a plurality of locations on the top plate 92.
This makes it possible to increase the air flow area as compared with the case where the screw holes 121,.
The deployment time can be reduced.

In this state, the screw holes 121,... Of the floating ring main body 95 are closed with the screw caps 122. Then, the screw holes 121,.
-Leakage of air from is prevented, and the floating ring 81 can be kept in a donut shape. Furthermore, since air leakage in the floating ring main body 95 can be prevented, buoyancy can be obtained.

When not in use, each screw hole 121,
, Remove the screw caps 122,.
The screw holes 121 are opened. As a result, the air in the floating ring main body 95 can be discharged, so that the floating ring 81
Can be transformed into a contracted state. Therefore, compactness becomes possible, and portability and storability can be improved.

On the other hand, the inward deformation is prevented by the floating ring body 95.
1 extending along the inner peripheral surface 93 and the outer peripheral surface 94
03. For this reason, the floating wheel body 9
5 can be made of vinyl, which has softness and airtightness and watertightness, and can be easily processed into a cylindrical shape or the like, and can be easily manufactured.

In addition, the skeleton 103 is formed by arranging a plurality of independent skeleton members 111,..., 112,.
, 112,... Can be determined. Thereby, the design at the time of development can be improved.

(Fourth Embodiment)

FIG. 4 is a view showing a cross section of a cushion material 151 as a hollow body according to a fourth embodiment of the present invention, and shows an expanded state.

That is, the cushion material 151 is configured to have a columnar shape when expanded, and the cushion material 151 is integrally formed of a synthetic resin. The cushion body 161 of the cushion material 151
Has a relatively thick bottom surface portion 162 and a top surface portion 163, and a cylindrical side surface portion 164 provided between the bottom surface portion 162 and the top surface portion 163 is formed to be thin. This side portion 164 is bent inward and extends inward and inwardly extending portions 165, and outwardly bent portions 166 are outwardly extended and extend outward. And are alternately formed, and are formed in a bellows shape.

The extension portions 165 and 166 constitute a deformation suppressing means for suppressing the deformation of the cushion body 161 to the inside of the side surface portion 164, and the bending provided between the extension portions 165 and 166. The part 167 is connected to the cushion body 16.
1 contributes to securing flexibility. Thereby, in the cushion material 151, between the state in which the top surface portion 163 is contracted close to the bottom surface portion 162 and the state in which the top surface portion 163 is extended away from the bottom surface portion 162 in FIG. It is configured to be able to expand and contract vertically.

At the center of the top surface portion 163, a cylindrical portion 171 projecting upward is formed.
An opening 172 communicating with the inside is formed. A male screw portion 173 is formed on a side surface of the cylindrical portion 171, and a female screw portion 175 of a cap 174 as an opening / closing member is provided.
Is configured to be screwed. Thus, in a state where the cap 174 is screwed and fitted to the cylindrical portion 171, the opening portion 17 due to a change in the internal pressure of the cushion body 161 is formed.
It is configured such that leakage of air from the second can be prevented. In addition, the cap 174 closes the opening 172 and the cap 174 removes the opening 172.
The open state in which 2 is opened can be selectively formed.

In the present embodiment having the above-described configuration, the cushion material 151 which has been contracted in the initial stage is formed.
When unfolding, the bottom part 162 and the top part 163 of the cushion main body 161 are spread and extended with both hands. At this time, the hollow cushion body 161 has an inwardly extending portion 16 for suppressing deformation toward the radial center side intersecting the expansion and contraction direction.
, And the outwardly extending portions 166 are alternately formed, and the shape in the radial direction is maintained. As a result, the volume inside the cushion material 151 is increased by the extent of the expansion, and air flows in from the opening 172 of the cylindrical portion 171 provided on the top surface portion 163 of the cushion main body 161.

As described above, air can flow into the interior simply by expanding the cushion body 161 in the contracted state, and the cushion material can be expanded and expanded. Therefore, in comparison with the cushion material 151 which sends air to the inside and expands the air, it becomes unnecessary to inflate the air, etc.
It can be deployed independently without relying on others.

In this state, the cushion body 161
A cap 174 is fitted to the cylindrical portion 171 to close the opening 172. Then, leakage of air from the opening 172 due to a change in the internal pressure of the cushion material 161 is prevented,
The cushion material 151 can be maintained in a columnar shape.

When not in use, the cap 174 is removed from the cylindrical portion 171 and the opening 172 is opened. Thereby, the air in the cushion main body 161 can be discharged, so that the cushion material 151 can be deformed into a contracted state. Therefore, compactness becomes possible, and portability and storability can be improved.

In this embodiment, the cylindrical portion 17
Although only the case where the opening 172 is closed by fitting the cap 174 to the cap 174 has been described, the present invention is not limited to this case.
Is held and pressed by a hinge-shaped holding member, and the opening 171 is opened.
May be closed. Further, a cock for opening and closing the opening 172 may be provided.

The shape of the hollow body in each of the above-described embodiments is not limited to these, and may be a three-dimensional shape such as a cone, a pyramid, a cube, or a rectangular parallelepiped.

Further, the hollow body of the present invention is not limited to the beach ball 1, the floating rings 41, 81, and the cushion material 161, but can be applied to a life-saving vest, a balloon, or the like that requires buoyancy. Also, spacers, health equipment,
It can also be applied to pillows and other items that require the shape of the body to be maintained. What is sucked into the hollow body of the present invention is not limited to gas, but may be a fluid such as water. For example, by sinking a contracted hollow body in water and extending it, water can be quickly sucked. If the opening is closed after inhalation, a water reservoir is formed by itself. In addition, this water body can be used as a weight by utilizing its weight.

The material of the main body of these hollow bodies is not limited to vinyl or synthetic resin.
A flexible film or paper having strength may be used, and the range of application is wide as long as it has water resistance, weather resistance, and chemical resistance.

[0068]

As described above, in the hollow body according to the first aspect of the present invention, a gas or other fluid can flow into the hollow body simply by extending the contracted body. Thereby, the hollow body can be expanded and expanded.

Therefore, as compared with the prior art in which air as a fluid is pressure-fed into the hollow body and deployed, there is no need to inject air or the like for pressure-feeding the air, and the air is independently deployed without depending on others. be able to.

In this state, by closing the opening provided in the main body with the closing means, it is possible to prevent the fluid from leaking from the opening due to a change in the internal pressure of the main body.
Accordingly, the present invention can be applied to a life vest, a floating ring, a beach ball, a balloon, and the like that obtain buoyancy by containing gas in the main body. Since the body shape can be maintained by preventing the leakage of the fluid from the opening, it can be applied to a spacer, a cushion material, a pillow and the like.

Further, in the hollow body according to the second aspect, by providing a plurality of the openings, the flow area of the fluid can be expanded. Thereby, the load at the time of expanding the main body can be reduced, and the deployment time can be shortened.

Further, in the hollow body according to the third aspect, the closing means can selectively form not only an opening but also an open state in which the opening is opened. Therefore, by forming the open state and discharging the internal fluid, the main body can be deformed into a contracted state, and the size can be reduced.

Further, in the hollow body according to the fourth aspect, by forming the deformation suppressing means by a skeleton extending along the side surface of the main body, the main body has softness and airtight watertightness, It can be made of vinyl or the like that can be easily processed into a bag shape or the like. Thereby, manufacturability can be improved.

Further, in the hollow body according to the fifth aspect, by forming the skeleton by arranging a plurality of independent skeleton members, it is possible to determine the shape of a portion where each skeleton member is arranged in the expanded state. it can. Thereby, the design at the time of development can be improved.

In addition, in the hollow body according to the sixth aspect, by forming the skeleton in a spiral shape, the shape of the main body at the time of development can be determined by one skeleton. Further, when one rod-shaped member is formed in a spiral shape, tension can be generated in the spiral skeleton in a direction spreading outward. This can contribute to maintaining the shape of the main body.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Beach Ball 11 Ball Body 22 Skeleton 31 Opening 32 Cap 41 Floating Ring 55 Floating Ring Main Body 62 Skeleton 63 Skeletal Member 71 Opening 72 Cap 81 Floating Ring 95 Floating Ring Main Body 111 Inner Skeleton Member 112 Outer Skeleton Member 121 Screw Hole 122 Threaded Cap 151 Cushion Material 161 Cushion body 172 Opening 174 Cap

Claims (6)

[Claims] 1. A hollow main body having flexibility that can expand and contract between a contracted state and an expanded state, an opening communicating with the inside, and suppressing deformation toward the center in a direction intersecting the expansion and contraction direction. A hollow body comprising: a deformation suppressing means; and a closing means for arbitrarily forming a closed state in which the opening is closed to prevent leakage of fluid from the opening due to a change in internal pressure. 2. The hollow body according to claim 1, wherein a plurality of said openings and said closing means corresponding to said openings are provided. 3. The hollow body according to claim 1, wherein said closing means is constituted by an opening / closing member for selectively forming an open state in which said opening is opened and said closed state. 4. The hollow body according to claim 1, wherein said deformation suppressing means is constituted by a skeleton extending along a side surface of said main body. 5. The skeleton according to claim 4, wherein the skeleton is formed by arranging a plurality of independent skeleton members.
The hollow body as described. 6. The hollow body according to claim 4, wherein the skeleton is formed in a spiral shape.