Force application device, and developable member and extensible member using the force application device

Abstract

To provide a force application device which does not have a power source and a machine drive part requiring a fixed mass, and can attain light weight, and a developable member and an extensible member using the force application device.SOLUTION: A force application device 3 for displacing a body 2 to be displaced by applying force to the body 2 to be displaced includes a bag body 31 which is mounted on the body 2 to be displaced and is sealed, and liquid 32L stored in the bag body 31, and expands the bag body 31 by evaporating the liquid 32L due to radiation heat from the sun, and thereby displaces the body 2 to be displaced.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a boosting device, a deployable member using the boosting device, and an extendable member.

Background Art

[0002] When conducting exploration activities on the moon or in space, it is conceivable to establish a base as an activity base. For establishing a base, for example, it can be assumed that a frame structure is transported to the base establishment site in a folded state and then deployed after arrival to form the framework of the base. Similarly, it can also be assumed that a solar panel transported in a folded state is deployed to secure the electric power necessary for the operation of the base. Such work of displacing panel materials, frame structures, etc. by deploying or changing their positions manually is not easy. Therefore, it is necessary to use some actuator (hereinafter referred to as a boosting device) with a panel material, a frame structure, etc. as a body to be displaced and displace this body to be displaced as described above.

[0003] Generally, as a boosting device, for example, an air cylinder that operates using air pressure as described in Patent Document 1 can be mentioned. Alternatively, as a boosting device, an electric actuator that operates with the power of an electric motor or the like can also be mentioned. The above-described air cylinder or electric actuator requires, as components, a power source that generates power, such as an air cylinder, a compressor, a battery, or an electric motor, and a mechanical drive unit that is mechanically driven by the power from the power source to displace the body to be displaced. Since these components have a certain mass, the boosting device itself also has a corresponding mass.

[0004] Here, when transporting materials from the earth to outside the earth, it is necessary to transport the materials against the gravity of the earth, so it is desirable that the mass of the materials be as small as possible. Therefore, it is also desirable to reduce the mass of the boosting device. Also, when transporting materials from the Earth to outer space, since a large acceleration acts on the materials, if the power assist device has a complex mechanical structure, there is a possibility that the power assist device may malfunction due to the influence of this acceleration. Therefore, it is desirable to configure the power assist device so as not to have a mechanically driven part.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The problem to be solved by the present invention is to provide a power assist device that does not have a power source or a mechanical drive unit that requires a certain mass and can be realized in a lightweight manner, a deployable member using the power assist device, and an extendable member.

Means for Solving the Problems

[0007] In order to solve the above problems, the present invention employs the following means. That is, the power assist device of the present invention is a power assist device that applies a force to a displaced body to displace the displaced body, and includes a sealed bag body attached to the displaced body and a liquid accommodated in the bag body. The liquid is vaporized by radiant heat from the sun, and the bag body expands, thereby displacing the displaced body. According to the above configuration, the power assist device includes a sealed bag body and a liquid accommodated in the bag body. When receiving radiant heat from the sun, the liquid vaporizes, causing the bag body to expand. Then, due to the expansion of the bag body, the volume of the bag body increases, so the displaced body to which the bag body is attached is displaced by the force applied to the bag body. In such a configuration, it is possible to construct the boosting device using only a bag body and a liquid. In addition to these, there is no particular need for components such as a power source like a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the object to be displaced. Therefore, it is possible to provide a boosting device that does not have a power source or a part mechanically driven by the power source and can be realized in a lightweight manner.

[0008] In one aspect of the present invention, the liquid is a substance whose boiling point is equal to or lower than the temperature that can rise when the radiant heat acts during the lunar day, and the bag body is made of a flexible resin. According to such a configuration, when the boosting device is used on the lunar surface, the liquid can be efficiently heated to a temperature above the boiling point by the radiant heat from the sun, and the liquid can be vaporized. Since the bag body is made of a flexible resin, when the liquid vaporizes, the bag body easily expands. Thereby, the object to be displaced can be easily displaced. Also, when the liquid is in a non-vaporized state, since the internal pressure of the bag body is reduced, there is no tension on the surface of the bag body, and the shape of the bag body can be easily changed. For this reason, it is possible to provide the bag body in an arbitrary shape adapted to the position and shape before the object to be displaced is displaced.

[0009] In one aspect of the present invention, the bag body is formed so as to be plate-shaped or rod-shaped when the liquid vaporizes and expands. According to such a configuration, when the liquid vaporizes and expands, the bag body becomes plate-shaped or rod-shaped, and the object to be displaced can be displaced along the plate-shaped or rod-shaped bag body.

[0010] In addition, the deployable member using the boosting device of the present invention includes a first member and a second member, and includes the boosting device as described above as a first boosting device. The first member and the second member are joined so as to be relatively rotatable about a first rotation axis provided along each of them, and are provided in a closed state with their respective surfaces facing each other. The bag body of the first boosting device is provided across the first rotation axis and is joined to each of the first member and the second member. According to such a configuration, the liquid contained in the bag body of the first boosting device vaporizes by receiving radiant heat from the sun, so that the bag body expands and gradually changes to a state having rigidity with tension. Then, since the bag body is provided across the first rotation axis and is joined to each of the first member and the second member, when the bag body begins to exhibit rigidity, the first member and the second member provided in a closed state with their respective surfaces facing each other rotate about the first rotation axis, and their respective surfaces are separated and deployed so as not to face each other. In this way, the first member and the second member to which the bag body is attached are displaced from the folded state to the deployed state due to the expansion of the bag body. In such a configuration, it is possible to construct the boosting device with at least only the bag body and the liquid. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that mechanically drives a displacement object by the power from the power source is not particularly required as a component. Therefore, it is possible to provide a deployable member provided with a boosting device that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0011] Further, the extendable member of the present invention includes a first member, a second member, and the boosting device as described above. The first member is provided so as to be detachable from the second member while being guided by the second member. When the bag body of the boosting device expands, the bag body is provided so as to abut on each of the surfaces of the first member and the second member that face each other. According to such a configuration, the liquid contained in the bag body of the boosting device absorbs radiant heat from the sun and vaporizes, causing the bag body to expand. Then, when the bag body of the boosting device expands, since the bag body is provided so as to contact each of the opposing surfaces of the first member and the second member, the expansion of the bag body applies a force to the first member in a direction away from the second member. As a result, the first member is displaced in a direction away from the second member while being guided by the second member. Consequently, due to the expansion of the bag body, the total length of the first member and the second member to which the bag body is attached is displaced so as to elongate. In such a configuration, it is possible to construct the boosting device using only the bag body and the liquid at a minimum. In addition to these, a power source such as a battery or an electric motor, and a mechanical drive unit that mechanically drives a displacement object by the power from the power source are not particularly required as components. Therefore, it is possible to provide an extendable member provided with a boosting device that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0012] In one aspect of the present invention, the first member and the second member are biased in a direction approaching each other by an elastic member. According to such a configuration, after the liquid in the bag body vaporizes due to radiant heat from the sun, when the radiant heat from the sun no longer acts on the boosting device and the temperature in the bag body drops below the boiling point of the liquid, the gas in the bag body liquefies and the internal pressure of the bag body decreases. Therefore, the bag body contracts and loses its rigidity. Then, the force applied to the first member in a direction away from the second member due to the expansion of the bag body is released. Here, since the first member and the second member are biased in a direction approaching each other by an elastic member, when the force due to the expansion of the bag body is released, the first member and the second member are displaced in a direction approaching each other by the biasing force of the elastic member. In this way, the total length of the first member and the second member is shortened. In this way, the extendable member can be expanded and contracted by repeating the vaporization and liquefaction of the liquid in the bag body according to the presence or absence of radiant heat from the sun.

Effect of the Invention

[0013] According to the present invention, it is possible to provide a boosting device that does not have a power source or a mechanical drive unit that requires a certain mass and can be realized in a lightweight manner, a deployable member using the boosting device, and an extendable member.

Brief Description of the Drawings

[0014]

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Embodiments for Carrying Out the Invention

[0015] Hereinafter, with reference to the accompanying drawings, embodiments for implementing a biasing device according to the present invention, a deployable member using the biasing device, and an extendable member will be described based on the drawings. (First Embodiment) FIG. 1 shows a boosting device according to a first embodiment of the present invention and a diagram showing the configuration of a deployable member using the boosting device. FIG. 2 is a diagram showing a state in which the deployable member of FIG. 1 is deployed. FIG. 3 is a cross-sectional view taken along the line I-I of FIG. 1. FIG. 4 is a cross-sectional view showing a state during the transition from the folded state to the deployed state of the deployable member. FIG. 5 is a cross-sectional view showing a state in which the deployable member is deployed.

[0016] The deployable member 1A of the present embodiment is, for example, a solar cell unit installed on the lunar surface. Note that the installation location of the deployable member 1A may be outside the lunar surface, such as in outer space. Further, the deployable member 1A may be other than a solar cell unit. This deployable member 1A has a boosting device 3 and a plurality of displaced bodies 2 that are displaced by the boosting device 3. In the present embodiment, each displaced body 2 is a solar cell panel. Each of the displaced bodies 2 includes a plate-like panel body having a predetermined thickness and a power generation unit provided on the surface of the panel body and made of a silicon semiconductor that generates electricity by irradiation with sunlight. In the present embodiment, the deployable member 1A includes a first member 21 and a pair of second members 22 as a plurality of displaced bodies 2.

[0017] The first member 21 is disposed at the central portion of the deployable member 1A. The first member 21 is, for example, rectangular in plan view. The pair of second members 22 are disposed on one side and the other side with the first member 21 interposed therebetween. Each second member 22 is provided along the long side 21b of the first member 21. Each second member 22 is triangular in right-angled shape in plan view and has a side 22b along the long side 21b of the first member 21. Each second member 22 and the first member 21 are rotatably connected by an appropriate hinge or the like, for example, around a first rotation axis S1 provided along the side 22b and the long side 21b on one surface 22f, 21f side of the second member 22 and the first member 21. Note that the shapes of the first member 21 and the second member 22 are not limited to the rectangular shape and the right-angled triangular shape as described above, and may have other shapes. In this way, the first member 21 and the pair of second members 22 are joined so as to be relatively rotatable about the first rotation axis S1 provided along each of them. As shown in FIG. 3, each of the first member 21 and the pair of second members 22 is provided in a closed state such that their respective surfaces 21f and 22f face each other.

[0018] In the deployable member 1A of the present embodiment, by a biasing device 3 as will be described later, from the state where the respective surfaces 22f of the pair of second members 22 face the surface 21f of the first member 21 as shown in FIG. 3, as shown in FIG. 5, each of the pair of second members 22 is rotated about the first rotation axis S1 with respect to the first member 21, and the state is changed to a state where the surface 21f of the first member 21 and the surfaces 22f of the second members 22 do not face each other and face the same direction. Here, in the following description, the state as shown in FIG. 3 is referred to as a state where the deployable member 1A is folded. Also, the state as shown in FIG. 5 is referred to as a state where the deployable member 1A is deployed. In the present embodiment, in the state where the deployable member 1A is deployed, the side end surface 21s of the first member 21 and the side end surface 22s of the second member 22 are in contact with each other, and the surface 21f of the first member 21 and the surfaces 22f of the pair of second members 22 are located along the same plane.

[0019] In the first embodiment in which the deployable member is used as a solar cell unit, and in each modification of the first embodiment described later, regarding each cross-sectional view shown in FIGS. 3 to 10 and FIGS. 14 to 19 used in the description, it is assumed that the sun is located above the deployable member shown in each cross-sectional view. Therefore, for example, in the present first embodiment, in the state where the deployable member 1A is deployed as shown in FIG. 5, power generation units are provided on the surfaces 21f and 22f facing the sun. That is, in the present embodiment, as shown in FIG. 3, in the state where the deployable member 1A is folded, the surfaces 21f and 22f of the first member 21 and the second member 22 on which the power generation units are provided are provided so as to face each other.

[0020] The force applying device 3 applies a force to the displaced body 2 to displace the displaced body 2. In the present embodiment, as the force applying device 3, a first force applying device 3A is provided. As shown in FIGS. 3 to 5, the first force applying device 3A straddles the first rotation axis S1 and is joined to each of the other surface 21g of the first member 21, which is opposite to the surface 21f, and the other surface 22g of the second member 22, which is opposite to the surface 22f, by an adhesive, welding, or the like. The first force applying device 3A is provided so as to connect the second member 22 to the first member 21 for each of the second members 22. As shown in FIG. 3, the first force applying device 3A includes a bag body 31 and a liquid 32L accommodated in the bag body 31.

[0021] The bag body 31 has a hollow sealed structure formed of a film-like or film-like material having flexibility, flexibility, and airtightness. The bag body 31 has heat resistance that can withstand a temperature rise due to sunlight irradiation. As will be described later, as the liquid 32L accommodated in the bag body 31 vaporizes due to radiant heat from the sun, the bag body 31 expands and gradually changes to a state in which it forms a certain shape with rigidity manifested. After the bag body 31 expands in this way, in order for the bag body 31 to maintain its shape, it is preferable that the bag body 31 does not have stretchability. Specifically, it is preferable that the bag body 31 has a film thickness and film strength such that the film-like or film-like material forming the bag body 31 does not stretch when the liquid 32L vaporizes in the bag body 31.

[0022] Further, the bag body 31 is preferably formed of a light-transmissive material such as a transparent material that allows sunlight to pass through so that the liquid 32L inside the bag body 31 can be efficiently heated by the radiant heat from the sun. Also, the bag body 31 may be formed of a material with a highly heat-collecting color, such as black, so that the bag body 31 itself can be efficiently heated by the radiant heat from the sun. Alternatively, the surface of the bag body 31 may be treated with black paint or the like. Further, the bag body 31 is preferably formed of a material with as high a thermal conductivity as possible. The bag body 31 may be formed of a material with a low thermal conductivity. In this case, it is desirable to manufacture the bag body 31 thinly with a resin such as a nylon film or a polyester film so that the liquid 32L inside the bag body 31 can be easily heated. In the present embodiment, the bag body 31 is formed by overlapping two sheet-like or film-like sheet members and joining all their peripheries to each other. As a result, in the present embodiment, the bag body 31 is formed so as to be plate-shaped when the liquid 32L vaporizes into the gas 32A. Both of these sheet members may be formed of a light-transmissive material. Alternatively, both of the sheet members may be formed so as not to have light transmissivity and to have a highly heat-collecting color. Further, one of the sheet members may be formed of a light-transmissive material and the other may be formed so as to have a highly heat-collecting color.

[0023] The liquid 32L is contained within the sealed bag 31. The liquid 32L vaporizes due to the radiant heat from the sun. The liquid 32L vaporizes when heated above its boiling point by the radiant heat from the sun. For example, when using the deployable member 1A on the lunar surface, the temperature on the moon fluctuates between approximately -170°C and 110°C depending on the presence or absence of radiant heat from the sun during day and night. Therefore, in this case, it is preferable that the liquid 32L be a substance with a boiling point of 100°C or lower so that it vaporizes due to the radiant heat from the sun. In previous research, there are those assuming the lunar surface temperature is 128°C, and in this case, it is preferable that the liquid 32L be a substance with a boiling point of 120°C or lower. In any case, it is desirable that the liquid 32L be a substance with a boiling point below the temperature that can rise when radiant heat acts during the lunar day. Also, after manufacturing the boosting device 3 on Earth and transporting it outside the Earth, it is necessary for the liquid 32L to maintain its state as a liquid without vaporizing until it is actually used. For this purpose, it is preferable that the liquid 32L be a substance with a boiling point above normal temperature on Earth, for example, 50°C or higher. Examples of such a liquid 32L include water, ethanol, etc. Also, when the liquid 32L vaporizes due to the radiant heat from the sun, the gas 32A is generated. When the liquid 32L vaporizes into the gas 32A, its volume increases and the bag 31 expands. The liquid 32L is contained within the bag 31 in a predetermined amount such that when its entire amount vaporizes into the gas 32A, it can fully expand the bag 31 without slack and exhibit a certain rigidity in the bag 31 to maintain its shape. Note that it is preferable for the bag 31 to expand such that when the liquid 32L vaporizes inside the bag 31, the pressure difference between the inside and outside of the bag 31 becomes, for example, 100 Pa or more.

[0024] As shown in FIG. 3, such a deployable member 1A is carried onto the lunar surface M in a folded state with the surfaces 22f of a pair of second members 22 facing the surface 21f of the first member 21. The deployable member 1A is supported on the lunar surface M by the first member 21. In FIG. 3, the deployable member 1A is illustrated as being placed directly on the lunar surface M, but the deployable member 1A may be supported at a position spaced apart from the lunar surface M by a support member such as a support column provided on the lunar surface M, for example, by the first member 21 being joined to the other surface 22g. In this way, the deployable member 1A in the folded state is installed such that the surface 21f of the first member 21 where the power generation unit is provided and the surface 22g of the second member 22 face upward. Thereby, the portion of the bag body 31 along the surface 22g of the second member 22 is positioned facing the sun.

[0025] Then, sunlight irradiates the deployable member 1A, and the inside of the bag body 31 is heated inside the portion of the bag body 31 along the surface 22g of the second member 22. When the liquid 32L in the bag body 31 is heated to a temperature above the boiling point by the radiant heat of the sun, the liquid 32L vaporizes to generate a gas 32A, and the bag body 31 expands. Here, the sunlight is irradiated on the portion of the bag body 31 along the surface 22g of the second member 22. For this reason, if the liquid 32L is not in the portion of the bag body 31 along the surface 22g of the second member 22 but in the portion along the surface 21g of the first member 21 on the side opposite to the sun, the liquid 32L may be difficult to be heated by the radiant heat of the sun. For this reason, it is preferable to provide, for example, a partition wall in the bag body 31 so that the liquid 32L stays in the portion of the bag body 31 along the surface 22g of the second member 22. Alternatively, instead of this, a porous body or the like capable of holding the liquid 32L may be provided in the portion of the bag body 31 along the surface 22g of the second member 22. Also, a mechanism for guiding sunlight may be provided in the portion of the bag body 31 along the surface 21g of the first member 21.

[0026] When the liquid 32L vaporizes and the bag body 31 expands, tension is generated in the bag body 31, and the bag body 31 gradually changes to a state with rigidity. Then, since the bag body 31 is provided across the first rotation axis S1 and joined to each of the first member 21 and the second member 22, when the bag body 31 expands and tension is generated, forces acting in opposite directions are applied to the first member 21 and the second member 22 in FIG. 3. As a result, as shown in FIG. 4, the first member 21 and the second member 22, which are provided to close with their respective surfaces 21f, 22f facing each other, rotate relative to each other about the first rotation axis S1. At this time, since the deployable member 1A is supported by the first member 21, the second member 22 rotates about the first rotation axis S1 with respect to the first member 21. As a result, the first member 21 and the surfaces 21f, 22f of each of the pair of second members 22 are deployed so as to be separated. In this way, through the state shown in FIG. 4, as shown in FIG. 5, the first member 21 and the second member 22 to which the bag body 31 is attached are expanded from the folded state due to the expansion of the bag body 31, and the surface 21f of the first member 21 and the surface 22f of the second member 22 are displaced to a state where they do not face each other and face the same direction (upward).

[0027] When the installation location becomes night and sunlight irradiation ceases, the temperature inside the bag body 31 drops below the boiling point of the liquid 32L, and the gas 32A liquefies to become the liquid 32L. Then, the internal pressure (inner pressure) of the bag body 31 decreases, the inflated bag body 31 deflates, and the biasing force acting on the displaceable body 2 from the biasing device 3 decreases. Here, in the present embodiment, when the deployable member 1A is in the deployed state, the side end faces 22s of the pair of second members 22 of the deployable member 1A abut against the side end faces 21s of the first member 21, and the second member 22 is in a state where it cannot rotate further in the direction in which it rotated when the second member 22 was deployed, about the first rotation axis S1. Therefore, even if the rigidity of the bag body 31 is lost, the second member 22 is suppressed from rotating further downward due to the lunar gravity. Further, in order for the deployable member 1A to return to the folded state again, it is necessary to rotate the second member 22 upward, i.e., toward the surface 22f side in FIG. 5. However, since the lunar gravity acts downward on the second member 22, the deployable member 1A does not automatically return to the folded state. In this way, the state where the surface 21f of the first member 21 and the surfaces 22f of the pair of second members 22 are located along the same plane is maintained as it is.

[0028] In the present embodiment, once the deployable member 1A is deployed, the entire bag body 31 is located below the displaceable body 2, so sunlight is blocked by the first member 21 and the second member 22 and is no longer directly irradiated onto the bag body 31. Therefore, although sunlight continues to irradiate the deployable member 1A itself, the temperature inside the bag body 31 may drop below the boiling point of the liquid 32L, and the gas 32A may liquefy to become the liquid 32L. However, even in this case, the deployed state of the deployable member 1A is maintained in the same way as already described for the case when the installation location becomes night.

[0029] The power applying device 3 as described above is a power applying device 3 that applies a force to the object to be displaced 2 to displace the object to be displaced 2, and includes a sealed bag body 31 attached to the object to be displaced 2 and a liquid 32L accommodated in the bag body 31. The liquid 32L is vaporized by the radiant heat from the sun, and the bag body 31 expands, thereby displacing the object to be displaced 2. According to the above configuration, the power applying device 3 includes a sealed bag body 31 and a liquid 32L accommodated in the bag body 31. When receiving the radiant heat from the sun, the liquid 32L is vaporized, and the bag body 31 expands. Then, due to the expansion of the bag body 31, the volume of the bag body 31 increases, so the object to be displaced 2 to which the bag body 31 is attached is displaced by the force applied to this bag body 31. In such a configuration, it is possible to construct the power applying device 3 with only the bag body 31 and the liquid 32L at a minimum. In addition to these, a power source such as a battery or an electric motor, and a mechanical drive unit that is mechanically driven by the power from the power source to displace the object to be displaced 2 are not particularly required as components. Therefore, it is possible to provide a power applying device 3 that does not have a power source or a part mechanically driven by the power source and can be realized in a lightweight manner.

[0030] Further, the liquid 32L is a substance whose boiling point is below the temperature that can rise when radiant heat acts during the lunar daytime, and the bag body 31 is made of a flexible resin. According to such a configuration, when the power applying device 3 is used on the lunar surface, the liquid 32L can be efficiently heated above the boiling point by the radiant heat from the sun to vaporize the liquid 32L. Since the bag body 31 is made of a flexible resin, when the liquid 32L is vaporized, the bag body 31 easily expands. Thereby, the object to be displaced 2 can be easily displaced. Also, when the liquid 32L is not vaporized, the internal pressure of the bag body 31 is reduced, so there is no tension on the surface of the bag body 31, and the shape of the bag body 31 can be easily changed. For this reason, it is possible to provide the bag body 31 in an arbitrary shape adapted to the position and shape before the object to be displaced 2 is displaced.

[0031] Further, the bag body 31 is formed to be plate-shaped when the liquid 32L vaporizes and expands. According to such a configuration, when the liquid 32L vaporizes and expands, the bag body 31 becomes plate-shaped, so that the object to be displaced can be displaced along the plate-shaped bag body 31.

[0032] In addition, the deployable member 1A using the biasing device 3 as described above includes a first member 21 and a second member 22, and includes the biasing device 3 as described above as a first biasing device 3A. The first member 21 and the second member 22 are joined so as to be relatively rotatable about a first rotation axis S1 provided along each of them, and are provided in a closed state such that their respective surfaces 21f and 22f face each other. The bag body 31 of the first biasing device 3A is provided across the first rotation axis S1 and joined to each of the first member 21 and the second member 22. According to such a configuration, the liquid 32L accommodated in the bag body 31 of the first biasing device 3A vaporizes by receiving radiant heat from the sun, so that the bag body 31 expands and gradually changes to a state having rigidity with tension. Then, since the bag body 31 is provided across the first rotation axis S1 and joined to each of the first member 21 and the second member 22, when the bag body 31 begins to exhibit rigidity, the first member 21 and the second member 22 provided in a closed state such that their respective surfaces 21f and 22f face each other rotate about the first rotation axis S1, and their respective surfaces 21f and 22f are separated and deployed so as not to face each other. In this way, the first member 21 and the second member 22 to which the bag body 31 is attached are displaced from the folded state to the deployed state due to the expansion of the bag body 31. In such a configuration, the biasing device 3 can be constructed by at least only the bag body 31 and the liquid 32L. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the object to be displaced 2 is not particularly required as a component. Therefore, it is possible to provide the deployable member 1A including the boosting device 3 that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0033] (First Modification Example of the First Embodiment) Note that the boosting device of the present invention and the deployable member using the boosting device are not limited to the above-described embodiments described with reference to the drawings, and various modification examples can be considered within the technical scope thereof. For example, in the above embodiment, the power generation unit is provided on the surfaces 21f and 22f of the first member 21 and the second member 22 that face each other in the state where the deployable member 1A is folded, but it is not limited thereto. FIG. 6 is a cross-sectional view showing a state where the deployable member is folded in the first modification example of the first embodiment of the present invention. FIG. 7 is a cross-sectional view showing a state where the deployable member in FIG. 6 is deployed. For example, as shown in FIG. 6, in the state where the deployable member 1A is folded, the power generation unit may be configured to be provided on the surfaces 21g and 22g of the first member 21 and the second member 22 that face opposite sides. In this case, since the power generation unit is provided on the surface 21g of the first member 21 on the side opposite to the surface 21f facing the second member 22, the deployable member 1A is installed such that the opposite surface 21g faces upward, that is, the top and bottom are reversed compared to the above-described first embodiment.

[0034] In this case, within the portion of the bag body 31 along the surface 21g of the first member 21 where sunlight irradiates the deployable member 1A, the interior of the bag body 31 is heated. When the liquid 32L within the bag body 31 is heated to a temperature above its boiling point by the radiant heat of the sun, the liquid 32L vaporizes to generate a gas 32A, and the bag body 31 expands. When the bag body 31 expands, tension is generated in the bag body 31, and it gradually changes to a state where the bag body 31 has rigidity. Then, since the bag body 31 is provided straddling the first rotation axis S1 and is joined to each of the first member 21 and the second member 22, when the bag body 31 expands and tension is generated, forces acting in opposite directions are applied to the first member 21 and the second member 22 in FIG. 6. As a result, as shown in FIG. 7, the first member 21 and the second member 22, which are provided with their respective surfaces 21f and 22f facing each other and closed, rotate relative to each other about the first rotation axis S1. Thereby, the surfaces 21f and 22f of each of the first member 21 and the pair of second members 22 are deployed so as to be separated, and the first member 21 and the second member 22 are displaced from the folded state to a state where the surface 21f of the first member 21 and the surface 22f of the second member 22 do not face each other and face the same direction (downward).

[0035] FIG. 8 is a cross-sectional view showing a state where the temperature inside the bag body of the force-applying device has decreased and the gas has liquefied from the state where the deployable member shown in FIG. 7 is deployed. When the installation location of the deployable member 1A becomes night and sunlight irradiation ceases, the temperature inside the bag body 31 drops below the boiling point of the liquid 32L, and the gas 32A liquefies to become the liquid 32L. Then, the internal pressure (internal pressure) of the bag body 31 decreases, and the bag body 31 shrinks. As a result, the force applied from the force-applying device 3 to the object to be displaced 2 decreases. As shown in FIG. 8, when the first member 21 of the deployable member 1A is placed on, for example, a stand 6 or the like, the pair of second members 22 rotate about the first rotation axis S1 in a direction opposite to the case where the deployable member 1A deploys due to the action of their own weight, and are displaced so as to hang downward from the end of the first member 21. Thereby, in the deployable member 1A, the area of the portion facing upward becomes smaller, and damage to the second member by flying objects or the like can be suppressed.

[0036] (Second Modification of the First Embodiment) FIG. 9 is a cross-sectional view showing the deployable member in the second modification of the first embodiment of the present invention. Further, for example, as shown in FIG. 9, an elastic member 40 made of a spring, rubber, or the like extending so as to straddle the first rotation axis S1 may be provided between the surface 21f of the first member 21 and the surface 22f of the second member 22, which are provided to face each other in the folded state. The elastic member 40 exerts a biasing force in a direction to bring the surface 21f of the first member 21 and the surface 22f of the second member 22 closer to each other with the first rotation axis S1 interposed therebetween. By providing such an elastic member 40, when the sunlight is blocked and the bag body 31 shrinks, the biasing force of the elastic member 40 can rotate the first member 21 and the second member 22 around the first rotation axis S1, and the deployable member 1A can be brought into a folded state.

[0037] (Third Modification of the First Embodiment) FIG. 10 is a cross-sectional view showing the deployable member in the third modification of the first embodiment of the present invention. In the above first embodiment, when the deployable member 1A in the folded state shown in FIG. 3 is installed, when the deployable member 1A is irradiated with sunlight, the sunlight is irradiated only to a limited portion provided along the surface 22g of the second member 22 of the bag body 31, and the entire bag body 31 is not irradiated with sunlight. Therefore, in order to efficiently utilize the radiant heat of the sunlight irradiated only to this limited portion, a heat collecting portion 53 for collecting the radiant heat of the sun may be provided in a portion of the bag body 31 provided along the surface 22g of the second member 22.

[0038] As the heat collecting portion 53, for example, a condenser lens, a condenser mirror, a plate or a block made of a material having a higher thermal conductivity than the displaced body 2, or the like can be used. By providing such a heat collecting portion 53, when irradiated with sunlight, the heat collecting portion 53 collects the radiant heat of the sun, and the liquid 32L can be efficiently vaporized inside the portion of the bag body 31 along the surface 22g of the second member 22.

[0039] (Fourth Modification of the First Embodiment) In the above first embodiment, the deployable member 1A is configured such that a pair of second members 22 are provided on both sides of the first member 21, and each of the pair of second members 22 is deployed in one stage with respect to the first member 21. However, the present invention is not limited to this. The deployable member 1A may be configured to be deployed in two or more stages with respect to the first member 21. FIG. 11 is a diagram showing the configuration of a deployable member according to a fourth modification of the first embodiment of the present invention. FIG. 12 is a diagram showing a state in which the deployable member of FIG. 11 is deployed in one stage. FIG. 13 is a diagram showing a state in which the deployable member of FIG. 12 is further deployed in one stage. FIG. 14 is a cross-sectional view taken along the line II-II of FIG. 11. FIG. 15 is a cross-sectional view showing a state in which the deployable member of FIG. 14 is deployed in one stage from the folded state. FIG. 16 is a cross-sectional view showing a state in which the deployable member of FIG. 15 is further deployed in one more stage. In FIG. 14, a part of a second biasing device 3B to be described later is drawn inside the first member 21. However, FIG. 14 schematically shows the deployable member 1B, and in actuality, this part may be provided, for example, in a gap between the first member 21 and the second member 22. For example, as shown in FIGS. 11 to 16, the deployable member 1B in this modification has a plurality of displaced bodies 2 and a biasing device 3. In this modification, the deployable member 1B includes, as a plurality of displaced bodies 2, a first member 21, a pair of second members 22, and a pair of third members 23.

[0040] The first member 21 is disposed at the central portion of the deployable member 1B. The first member 21 is, for example, rectangular in plan view. The pair of second members 22 are disposed on one side and the other side with the first member 21 interposed therebetween. Each second member 22 is rotatably connected to the long side 21b of the first member 21 around a first rotation axis S1 by an appropriate hinge or the like. As shown in FIGS. 13 and 16, in the state where the deployable member 1B is deployed, the pair of third members 23 are arranged on one side and the other side with the pair of second members 22 interposed therebetween. Each third member 23 has a side 23c along the side 22c of the second member 22 opposite to the side 22b along the long side 21b of the first member 21. The second member 22 and the third member are provided such that the surface 22g of the second member 22 on the side opposite to the surface 22f provided to face the surface 21f of the first member 21 in the folded state and the surface 23g of the third member 23 face each other. As shown in FIGS. 14 to 16, the third member 23 and the second member 22 are rotatably connected around the second rotation axis S2 along the sides 23c and 22c on the surfaces 22g and 23g that face each other in the folded state of the second member 22 and the third member 23 by an appropriate hinge or the like. In this way, the second member 22 and the third member 23 are joined so as to be relatively rotatable about the second rotation axis S2 provided along each of them. Each of the second member 22 and the third member 23 is provided in a closed state such that their respective surfaces 22g and 23g face each other.

[0041] In this modification, the power generation unit is provided on the surfaces 21f, 22f, and 23f of the first member 21, the second member 22, and the third member 23 that face the sun in the state where the deployable member 1B is deployed as shown in FIG. 16. That is, in this modification, as shown in FIG. 14, in the state where the deployable member 1B is folded, the power generation unit is provided on the surfaces 21f and 22f of the first member 21 and the second member 22 that face each other, and the power generation unit is provided on the surfaces 22f and 23f of the second member 22 and the third member 23 on the side opposite to the surfaces 22g and 23g that face each other.

[0042] In this modification, as the urging device 3, in addition to the first urging device 3A described in the above embodiment, it has a second urging device 3B. Similar to the above-described embodiment, the first urging device 3A is joined to each of the other surface 21g of the first member 21, which is opposite to the surface 21f, and the other surface 22g of the second member 22, which is opposite to the surface 22f, across the first rotating shaft S1 by an adhesive, welding, or the like. The first urging device 3A is provided to connect the second member 22 to the first member 21 with respect to each of the second members 22. The second urging device 3B is joined to each of the surface 22f of the second member 22 and the surface 23f of the third member 23, which are provided to face opposite sides across the second rotating shaft S2, by an adhesive, welding, or the like. The second urging device 3B is provided to connect the third member 23 to the second member 22 with respect to each of the third members 23. Similar to the first urging device 3A, this second urging device 3B also has a configuration including a bag body 31 and a liquid 32L accommodated in the bag body 31.

[0043] As shown in FIGS. 11 and 14, such a deployable member 1B is carried onto the lunar surface in a folded state in which the surface 22f of each second member 22 faces the surface 21f of the first member 21, and the surface 23g of each third member 23 faces the surface 22g of the second member 22. The deployable member 1B in such a folded state is installed such that the surface 21f of the first member 21, on which the power generation unit is provided, the surface 22g of the second member 22, and the surface 23f of the third member 23 face upward, that is, face the sun. At this time, in the first urging device 3A, the liquid 32L is positioned inside a portion of the bag body 31 along the surface 22g of the second member 22. Also, in the second urging device 3B, the liquid 32L is positioned inside a portion of the bag body 31 along the surface 22f of the second member 22.

[0044] In such a state, when sunlight irradiates, due to the radiant heat of the sun, the liquid 32L in the bag body 31 of the first boosting device 3A vaporizes, and the bag body 31 of the first boosting device 3A expands. When the bag body 31 expands, tension occurs in the bag body 31, and the bag body 31 gradually changes to a state with rigidity. Then, since the bag body 31 is provided across the first rotation axis S1 and joined to each of the first member 21 and the second member 22, when the bag body 31 expands and tension is generated, forces acting in opposite directions to each other act on the first member 21 and the second member 22 in FIG. 14. As a result, as shown in FIG. 15, the pair of second members 22 rotate about the first rotation axis S1 with respect to the first member 21 and displace to a deployed state.

[0045] When the second member 22 rotates about the first rotation axis S1 with respect to the first member 21, the surface 22f of the second member 22 faces upward. Thus, when sunlight irradiates the deployable member 1B, inside the portion of the bag body 31 of the second boosting device 3B along the surface 22f of the second member 22, the inside of the bag body 31 is heated. Due to this radiant heat of the sun, when the liquid 32L in the bag body 31 is heated above the boiling point, the liquid 32L vaporizes to generate the gas 32A, the bag body 31 of the second boosting device 3B expands, tension occurs in the bag body 31, and the bag body 31 gradually changes to a state with rigidity. Then, since the bag body 31 is provided across the second rotation axis S2 and joined to each of the second member 22 and the third member 23, when the bag body 31 expands and tension is generated, forces acting in opposite directions to each other act on the second member 22 and the third member 23 in FIG. 15. As a result, as shown in FIG. 16, the third member 23 rotates about the second rotation axis S2 with respect to the second member 22. In this way, the pair of third members 23 rotate about the second rotation axis S2 with respect to the second member 22 and displace to a deployed state. As described above, the deployable member 1B is configured such that the pair of second members 22 and the pair of third members 23 are sequentially deployed in two stages with respect to the first member 21.

[0046] In the above-described configuration, the deployable member 1B includes a first member 21, a second member 22, and a third member 23, and includes the biasing device 3 as described above as a first biasing device 3A and a second biasing device 3B. The first member 21 and the second member 22 are joined so as to be relatively rotatable about a first rotation axis S1 provided along each of them, and are provided closed so that their respective surfaces 21f and 22f face each other. The bag body 31 of the first biasing device 3A is provided straddling the first rotation axis S1 and is joined to each of the first member 21 and the second member 22. The second member 22 and the third member 23 are joined so as to be relatively rotatable about a second rotation axis S2 provided along each of them, and are provided closed so that their respective surfaces 22g and 23g face each other. The bag body 31 of the second biasing device 3B is provided straddling the second rotation axis S2 and is joined to each of the second member 22 and the third member 23. According to such a configuration, the liquid 32L accommodated in the bag body 31 of the first biasing device 3A vaporizes by receiving radiant heat from the sun, so that the bag body 31 of the first biasing device 3A expands and gradually changes to a state having increased rigidity. Then, since the bag body 31 is provided straddling the first rotation axis S1 and is joined to each of the first member 21 and the second member 22, when the bag body 31 begins to exhibit rigidity, the first member 21 and the second member 22, which are provided closed so that their respective surfaces 21f and 22f face each other, rotate about the first rotation axis S1, and their respective surfaces 21f and 22f are separated and deployed so as not to face each other. In this way, the first member 21 and the second member 22 to which the bag body 31 of the first biasing device 3A is attached are displaced from the folded state to the deployed state by the expansion of the bag body 31. In addition, the liquid 32L contained in the bag body 31 of the second boosting device 3B is vaporized by receiving radiant heat from the sun, causing the bag body 31 of the second boosting device 3B to expand and gradually change to a state with increased rigidity. Then, since the bag body 31 is provided across the second rotation axis S2 and joined to each of the second member 22 and the third member 23, as the bag body 31 begins to exhibit rigidity, the second member 22 and the third member 23, which are provided with their respective surfaces 22g and 23g facing each other and closed, rotate about the second rotation axis S2, and are deployed so that their respective surfaces 22g and 23g are separated and do not face each other. In this way, the second member 22 and the third member 23 to which the bag body 31 of the second boosting device 3B is attached are displaced from the folded state to the deployed state due to the expansion of the bag body 31. As a result, it is possible to displace all of the first member 21, the second member 22, and the third member 23 from the folded state to the deployed state. In such a configuration, it is possible to construct the boosting device 3 using at least only the bag body and the liquid. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the object to be displaced is not particularly required as a component. Therefore, it is possible to provide the deployable member 1B provided with the boosting device 3 that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0047] Incidentally, in the above description, for simplicity of explanation, it has been described that the second member 22 is deployed with respect to the first member 21, and then the third member 23 is deployed with respect to the second member 22. However, it is not limited to this. As shown in FIG. 14, in a state where the deployable member 1B is provided in a folded manner, the bag bodies 31 of both the first urging device 3A and the second urging device 3B are in a state where they can receive sunlight. Therefore, the liquid 32L inside the bag body 31 of the first urging device 3A is heated and expands, and the second member 22 operates to deploy with respect to the first member 21. At the same time and in parallel, the liquid 32L inside the bag body 31 of the second urging device 3B is heated and expands, and the third member 23 may operate to deploy with respect to the second member 22. If it is necessary to sequentially perform the deployment of the second member 22 with respect to the first member 21 and the deployment of the third member 23 with respect to the second member 22, rather than simultaneously, for example, different substances may be sealed in the bag bodies 31 as the liquid 32L of the first urging device 3A and the second urging device 3B such that the boiling point of the liquid 32L of the first urging device 3A is lower than the boiling point of the liquid 32L of the second urging device 3B. By doing so, even when sunlight is simultaneously irradiated on both the first urging device 3A and the second urging device 3B, the liquid 32L of the first urging device 3A vaporizes earlier than the liquid 32L of the second urging device 3B, so that the first urging device 3A operates earlier than the second urging device 3B, and thus the deployment of the second member 22 with respect to the first member 21 is performed earlier than the deployment of the third member 23 with respect to the second member 22.

[0048] (Fifth Modification of the First Embodiment) FIG. 17 is a cross-sectional view showing a state in which the deployable member according to the fifth modification of the first embodiment of the present invention is folded. FIG. 18 is a cross-sectional view showing a state in which the deployable member in FIG. 17 is deployed one step from the folded state. FIG. 19 is a cross-sectional view showing a state in which the deployable member in FIG. 18 is further deployed one more step. In FIG. 17, a part of the second biasing device 3B and a heat collecting part 52 to be described later are drawn inside the first member 21. However, FIG. 17 schematically depicts the deployable member 1C, and actually, this part can be provided, for example, in a gap between the first member 21 and the second member 22. For example, as shown in FIGS. 17 to 19, the deployable member 1C in this modification may be configured to include heat collecting parts 51 and 52 in addition to the deployable member 1B according to the fourth modification of the first embodiment. The heat collecting part 51 is provided in a portion along the surface 22g of the second member 22 where sunlight is irradiated in a state where the deployable member 1C is folded as shown in FIG. 17 in the bag body 31 of the first biasing device 3A. The heat collecting part 52 is provided in a portion along the surface 22f of the second member 22, which is opposite to the surface 22g where the heat collecting part 52 is provided, in the bag body 31 of the second biasing device 3B.

[0049] When sunlight is irradiated, as shown in FIG. 17, due to the radiant heat of the sun, first, the liquid 32L in the bag body 31 of the first biasing device 3A where the heat collecting part 51 is provided vaporizes, and the bag body 31 of the first biasing device 3A expands. When the bag body 31 expands, tension is generated in the bag body 31, and the bag body 31 gradually changes to a state having rigidity. Then, since the bag body 31 is provided straddling the first rotation axis S1 and is joined to each of the first member 21 and the second member 22, when the bag body 31 expands and generates tension, forces acting in opposite directions are applied to the first member 21 and the second member 22 in FIG. 17. As a result, as shown in FIG. 18, the pair of second members 22 rotate about the first rotation axis S1 with respect to the first member 21 and are displaced to the deployed state.

[0050] When the second member 22 rotates about the first rotation axis S1 with respect to the first member 21, the heat collecting portion 52 faces upward. As a result, due to the radiant heat of the sun, inside the portion along the surface 22f of the second member 22 where the heat collecting portion 52 is provided in the bag body 31 of the second power device 3B, the inside of the bag body 31 is heated. When the liquid 32L inside the bag body 31 is heated to a temperature equal to or higher than the boiling point by this radiant heat of the sun, the liquid 32L vaporizes to generate a gas 32A, and the bag body 31 of the second power device 3B expands, causing tension in the bag body 31 and gradually changing to a state where the bag body 31 has rigidity. Then, since the bag body 31 is provided straddling the second rotation axis S2 and is joined to each of the second member 22 and the third member 23, when the bag body 31 expands and tension is generated, forces acting in opposite directions are applied to the second member 22 and the third member 23 in FIG. 18. As a result, as shown in FIG. 19, the third member 23 rotates about the second rotation axis S2 with respect to the second member 22 and is displaced to an expanded state.

[0051] (Another modification of the first embodiment) For example, as described with reference to FIGS. 7 and 8 as the first modification, or in the state shown in FIG. 16, when the radiant heat of the sun disappears, the gas 32A inside the bag body 31 liquefies and the bag body 31 contracts, the second member 22 and the third member 23 will hang downward. In a case where it is desired to suppress this, an appropriate stopper mechanism may be provided so as to suppress the second member 22 and the third member 23 from rotating in the direction in which they are folded after they are once deployed.

[0052] (Second embodiment) FIG. 20 shows a diagram showing the configuration of a power device according to the second embodiment of the present invention and a deployable member using the power device. FIG. 21 is a cross-sectional view taken along the arrow III-III in FIG. 20. FIG. 22 is a diagram showing the state where the deployable member in FIG. 20 is deployed. FIG. 23 is a cross-sectional view showing the state where the deployable member in FIG. 21 is deployed. The deployable member 1D of the present embodiment is, for example, a frame that forms the framework of a base installed on the lunar surface. Note that the installation location of the deployable member 1D may be outside the lunar surface, such as in outer space. Further, the deployable member 1D may be other than a frame. The deployable member 1D of the present embodiment has a biasing device 8 and a plurality of displaced members 7 that are displaced by the biasing device 8. In the present embodiment, the deployable member 1D includes a first member 71 and a second member 72 as the plurality of displaced members 7. Each displaced member 7 (the first member 71, the second member 72) is a frame that constitutes various structures as described above. For example, it has a pair of beams 75 extending in parallel, a connecting member 76 that connects both ends of the pair of beams 75, and a reinforcing brace 77 provided in an X shape inside the pair of beams 75 and the pair of connecting members 76. Note that the shape and configuration of the frame as the displaced member 7 can be changed as appropriate.

[0053] The first member 71 and the second member 72 are rotatably connected around a first rotation axis S11 provided along the end faces 71b of the pair of beams 75 of the first member 71 and the end faces 72b of the pair of beams 75 of the second member 72, for example, on one surface 71f, 72f side of the first member 71 and the second member 72, by an appropriate hinge or the like. The first member 71 and the second member 72 are joined so as to be relatively rotatable about the first rotation axis S11 provided along each of them. As shown in FIG. 21, each of the first member 71 and the second member 72 is provided closed such that their respective surfaces 71f, 72f face each other.

[0054] The force applying device 8 applies a force to the displaced body 7 to displace the displaced body 7. In the present embodiment, as the force applying device 8, it has a first force applying device 8A. The first force applying device 8A is provided corresponding to each of the pair of beams 75. The first force applying device 8A straddles the first rotation axis S11, and is joined to each of the other surface 71g of the beam 75 of the first member 71 on the side opposite to the surface 71f facing the second member 72, and the other surface 72g of the beam 75 of the second member 72 on the side opposite to the surface 72f facing the first member 71, by an adhesive, welding, or the like. The first force applying device 8A includes a bag body 81 and a liquid 32L housed in the bag body 81. The bag body 81 is a hollow sealed structure formed of a film-like or sheet-like material having flexibility, flexibility, and airtightness, similar to the bag body 31 of the first embodiment. In the present embodiment, the bag body 81 is provided so as to have a rod-like shape, that is, a shape elongated in one direction, when the liquid 32L vaporizes into a gas 32A. The liquid 32L may be the same substance as the liquid 32L of the first embodiment.

[0055] Such a deployable member 1D is carried onto the lunar surface in a folded state with the surface 72f of the second member 72 facing the surface 71f of the first member 71. The deployable member 1D in such a folded state is installed, for example, with the surface 71g of the first member 71 facing upward. Then, sunlight irradiates the deployable member 1D, and the inside of the bag body 81 is heated inside the portion along the surface 71g of the first member 71 in the bag body 81. As shown in FIGS. 22 and 23, when the liquid 32L in the bag body 81 is heated above the boiling point by the radiant heat of the sun, the liquid 32L vaporizes to generate a gas 32A, and the bag body 81 expands into a rod shape. When the liquid 32L vaporizes and the bag body 81 expands, tension is generated in the bag body 81, and the bag body 81 gradually changes to a state with rigidity. Then, since the bag body 81 is provided across the first rotation axis S11 and joined to each of the first member 71 and the second member 72, when the bag body 81 expands and generates tension, forces acting in opposite directions are applied to the first member 71 and the second member 72. As a result, the first member 71 and the second member 72, which are provided with their respective surfaces 71f and 72f facing each other in a closed manner, rotate relative to each other about the first rotation axis S11. Thereby, the surfaces 71f and 72f of the first member 71 and the second member 72 are deployed so as to be separated. In this way, the first member 71 and the second member 72 to which the bag body 81 is attached are displaced from the folded state to the deployed state due to the expansion of the bag body 81.

[0056] When the installation location of the deployable member 1D becomes night and sunlight irradiation ceases, the temperature inside the bag body 81 drops below the boiling point of the liquid 32L, and the gas 32A liquefies to become the liquid 32L. Then, the internal pressure (inner pressure) inside the bag body 81 decreases, the inflated bag body 81 deflates, and the force applied from the power device 8 to the object to be displaced 7 decreases. Even in such a case, it is preferable to provide an appropriate stopper mechanism so that the frame forming the base skeleton is not folded and the first member 71 and the second member 72 of the deployable member 1D maintain the deployed state.

[0057] The power device 8 as described above is a power device 8 that applies a force to the object to be displaced 7 to displace the object to be displaced 7, and includes a sealed bag body 81 attached to the object to be displaced 7 and a liquid 32L accommodated in the bag body 81. The liquid 32L vaporizes due to radiant heat from the sun, causing the bag body 81 to expand, thereby displacing the object to be displaced 7. According to the above configuration, the power device 8 includes a sealed bag body 81 and a liquid 32L accommodated in the bag body 81. When receiving radiant heat from the sun, the liquid 32L vaporizes, causing the bag body 81 to expand. Then, due to the expansion of the bag body 81, the volume of the bag body 81 increases, so the object to be displaced 7 to which the bag body 81 is attached is pushed by this bag body 81 and displaced. In such a configuration, the boosting device 8 can be constructed with at least only the bag body 81 and the liquid 32L. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the object to be displaced 7 is not particularly required as a component. Therefore, it is possible to provide a boosting device 8 that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0058] Also, the liquid 32L is a substance whose boiling point is below the temperature that can rise when radiant heat acts during the lunar daytime, and the bag body 81 is made of a flexible resin. According to such a configuration, when the boosting device 8 is used on the lunar surface, the liquid 32L can be efficiently heated above its boiling point by the radiant heat from the sun to vaporize the liquid 32L. Since the bag body 81 is made of a flexible resin, when the liquid 32L vaporizes, the bag body 81 easily expands. Thereby, the object to be displaced 7 can be easily displaced. Also, when the liquid 32L is in a non-vaporized state, since the internal pressure of the bag body 81 is reduced, there is no tension on the surface of the bag body 81, and the shape of the bag body 81 can be easily changed. For this reason, the bag body 81 can be provided in an arbitrary shape according to the position and shape before the object to be displaced 7 is displaced.

[0059] Also, the bag body 81 is formed to be rod-shaped when the liquid 32L vaporizes and expands. According to such a configuration, when the liquid 32L vaporizes and expands, the bag body 81 becomes rod-shaped, and the object to be displaced 7 can be displaced along the rod-shaped bag body 81.

[0060] In addition, the deployable member 1D using the boosting device 8 as described above includes a first member 71 and a second member 72, and includes the boosting device 8 as described above as a first boosting device 8A. The first member 71 and the second member 72 are joined so as to be relatively rotatable about a first rotation axis S11 provided along each of them, and are provided in a closed state such that their respective surfaces 71f and 72f face each other. The bag body 81 of the first boosting device 8A is provided across the first rotation axis S11 and is joined to each of the first member 71 and the second member 72. According to such a configuration, the liquid 32L accommodated in the bag body 81 of the first boosting device 8A vaporizes by receiving radiant heat from the sun, so that the bag body 81 expands and gradually changes to a state having rigidity with tension. Then, since the bag body 81 is provided across the first rotation axis S11 and is joined to each of the first member 71 and the second member 72, when the bag body 81 begins to exhibit rigidity, the first member 71 and the second member 72 provided in a closed state such that their respective surfaces 71f and 72f face each other rotate about the first rotation axis S11, and their respective surfaces 71f and 72f are separated and deployed so as not to face each other. In this way, the first member 71 and the second member 72 to which the bag body 81 is attached are displaced from the folded state to the deployed state by the expansion of the bag body 81. In such a configuration, it is possible to construct the boosting device 8 with only the bag body 81 and the liquid 32L at a minimum. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that mechanically drives the displaced body 7 by the power from the power source is not particularly required as a component. Therefore, it is possible to provide a deployable member 1D including a boosting device 8 that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0061] (Modification of the Second Embodiment) In addition, in the deployable member 1D shown in the above-described second embodiment, the second member 72 is configured to be deployed in one stage with respect to the first member 71. However, in the deployable member 1D as well, similar to the fourth modification example of the first embodiment and the like, after the third member is rotatably connected to the second member 72, the second member 72 and the third member may be deployed in a plurality of stages with respect to the first member 71.

[0062] (Third Embodiment) FIG. 24 shows a diagram illustrating the configuration of the extendable member according to the third embodiment of the present invention. FIG. 25 is a diagram showing a state in which the extendable member of FIG. 24 is extended. The extendable member 100 of the present embodiment is, for example, a piston used on the lunar surface. Note that the installation location of the extendable member 100 may be other than the lunar surface, such as outer space. The extendable member 100 of the present embodiment includes a biasing device 9 and a plurality of displaced bodies 110 that are displaced by the biasing device 9.

[0063] In the present embodiment, the extendable member 100 includes a first member 111 and a second member 112 as a plurality of displaced bodies 110. Each of the first member 111 and the second member 112 has a cylindrical shape extending in the central axis direction, and one ends 111a and 112a thereof are closed. The first member 111 has a smaller diameter than the second member 112 and is inserted into the second member 112. The first member 111 and the second member 112 are configured to be relatively displaceable along their central axis directions. Thereby, the first member 111 is provided so as to be able to approach and separate from the second member 112 while being guided by the second member 112. In addition, the extendable member 100 includes an elastic member 120. The elastic member 120 is composed of a spring or the like, and one end is joined to the outer surface of the first member 111 and the other end is joined to the outer surface of the second member 112, respectively. Thereby, the elastic member 120 biases the first member 111 and the second member 112 in a direction approaching each other.

[0064] The biasing device 9 applies a force to the displaced body 110 (the first member 111 and the second member 112) to displace the displaced body 110. In the present embodiment, the biasing device 9 includes a bag body 91 and a liquid 32L accommodated in the bag body 91. In the present embodiment, as shown in FIG. 24, the biasing device 9 is accommodated, for example, in the first member 111 in a state where the liquid 32L has not vaporized. The bag body 91 has a hollow sealed structure formed of a film-like or film-shaped material having flexibility, flexibility, and airtightness, similar to the bag bodies 31 and 81 of the first and second embodiments. In the present embodiment, as shown in FIG. 25, the bag body 91 is provided so as to have a rod shape, that is, a shape that is long in one direction (the left-right direction in FIG. 25) when the liquid 32L vaporizes into the gas 32A. As shown in FIG. 24, the bag body 91 of the present embodiment is accommodated in the first member 111 in a state where the length in the one direction is short, for example, in a folded state or in a state crushed in the one direction, in a state where the liquid 32L has not vaporized.

[0065] The liquid 32L in the bag body 91 vaporizes due to the radiant heat of the sun. The liquid 32L may be the same substance as the liquid 32L of the first and second embodiments. Here, in order to efficiently heat the liquid 32L in the bag body 91 by the radiant heat of the sun, for example, it is preferable to provide a light-transmitting portion by forming at least a part of the first member 111 in which the bag body 91 is accommodated of a material having light-transmittance. Alternatively, as the light-transmitting portion, an opening for transmitting sunlight may be provided in the first member 111. Further, after having the above-described configuration, a heat collecting portion (not shown) may be provided in the light-transmitting portion formed in the first member 111.

[0066] In such an extensible member 100, the liquid 32L accommodated in the bag 91 of the force applying device 9 shown in FIG. 24 is heated by receiving radiant heat from the sun. When the liquid 32L in the bag 91 is heated above its boiling point, the liquid 32L vaporizes to generate a gas 32A, and the bag 91 expands and extends in a rod shape. Then, the bag 91 abuts on the opposing surfaces 111f and 112f inside the respective one ends 111a and 112a of the first member 111 and the second member 112. As the expansion and extension of the bag 91 further continue, the first member 111 is forced in a separating direction with respect to the second member 112. As a result, as shown in FIG. 25, the first member 111 is displaced in a separating direction with respect to the second member 112 while being guided by the second member 112. As a result, due to the expansion of the bag 91, the total length of the first member 111 and the second member 112 to which the bag 91 is attached is displaced so as to extend.

[0067] Further, after the liquid 32L in the bag 91 vaporizes due to radiant heat from the sun, when the sunlight irradiation stops, the temperature inside the bag 91 drops below the boiling point of the liquid 32L, and the gas inside the bag 91 liquefies to become the liquid 32L. Then, the internal pressure (internal pressure) of the bag 91 is reduced, and the bag 91 contracts, so that the force applied to the first member 111 in the separating direction with respect to the second member 112 due to the expansion of the bag 91 is released. Here, since the first member 111 and the second member 112 are biased in a direction approaching each other by the elastic member 120, when the force applied by the expansion of the bag 91 is released, the first member 111 and the second member 112 are displaced in a direction approaching each other by the biasing force of the elastic member 120. In this way, the total length of the first member 111 and the second member 112 is reduced.

[0068] FIG. 26 is a diagram showing an example of a mechanism provided with the extensible member according to the present embodiment. Such an extensible member 100 can be used, for example, as shown in FIG. 26, to relatively displace a first member 201 and a second member 202 that constitute a solar panel, a frame, or the like. For example, with respect to the deployable member described as the first embodiment, by pivotally pin - joining one end and the other end of the extensible member 100 to the side surfaces of the first member 201 and the second member 202 respectively, as the extensible member 100 extends, the deployable member unfolds from the folded state, and further, as the extensible member 100 contracts, the deployable member is folded from the deployed state. Thus, it can be configured.

[0069] The force - applying device 9 as described above is a force - applying device 9 that applies a force to the object - to - be - displaced 110 to displace the object - to - be - displaced 110, and includes a sealed bag body 91 attached to the object - to - be - displaced 110 and a liquid 32L accommodated in the bag body 91. When the liquid 32L vaporizes due to radiant heat from the sun and the bag body 91 expands, the object - to - be - displaced 110 is displaced. According to the above - described configuration, the force - applying device 9 includes a sealed bag body 91 and a liquid 32L accommodated in the bag body 91. When receiving radiant heat from the sun, the liquid 32L vaporizes, causing the bag body 91 to expand. Then, due to the expansion of the bag body 91, the volume of the bag body 91 increases, so the object - to - be - displaced 110 to which the bag body 91 is attached is pushed by this bag body 91 and displaced. In such a configuration, it is possible to construct the force - applying device 9 with at least only the bag body 91 and the liquid 32L. In addition to these, a power source such as a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the object - to - be - displaced 110 is not particularly required as a component. Therefore, it is possible to provide a force - applying device 9 that does not have a power source or a part mechanically driven by the power source and can be realized in a lightweight manner.

[0070] Further, the liquid 32L is a substance whose boiling point is below the temperature that can rise when radiant heat acts during the lunar day, and the bag body 91 is made of a flexible resin. According to such a configuration, when the boosting device 9 is used on the lunar surface, the radiant heat from the sun can efficiently heat the liquid 32L above its boiling point to vaporize the liquid 32L. Since the bag body 91 is made of a resin with flexibility, when the liquid 32L vaporizes, the bag body 91 easily expands. Thereby, the object to be displaced 110 can be easily displaced. Also, when the liquid 32L is in a non-vaporized state, since the internal pressure of the bag body 91 is reduced, there is no tension on the surface of the bag body 91, and the shape of the bag body 91 can be easily changed. Therefore, the bag body 91 can be provided in an arbitrary shape adapted to the position and shape before the object to be displaced 110 is displaced.

[0071] Also, the bag body 91 is formed to be rod-shaped when the liquid 32L vaporizes and expands. According to such a configuration, when the liquid 32L vaporizes and expands, the bag body 91 becomes rod-shaped, and the object to be displaced can be displaced along the rod-shaped bag body 91.

[0072] Also, the extendable member 100 using the boosting device 9 as described above includes a first member 111, a second member 112, and the boosting device 9. The first member 111 is provided so as to be able to approach and separate from the second member 112 while being guided by the second member 112. When the bag body 91 of the boosting device 9 expands, the bag body 91 is provided to abut against each of the opposing surfaces 111f and 112f of the first member 111 and the second member 112. According to such a configuration, the liquid 32L accommodated in the bag body 91 of the booster device 9 vaporizes upon receiving radiant heat from the sun, causing the bag body 91 to expand. Then, when the bag body 91 of the booster device 9 expands, since the bag body 91 is provided so as to contact each of the opposing surfaces 111f and 112f of the first member 111 and the second member 112, the expansion of the bag body 91 causes the first member 111 to be forced in a direction away from the second member 112. As a result, the first member 111 is displaced in a direction away from the second member 112 while being guided by the second member 112. Consequently, due to the expansion of the bag body 91, the total length of the first member 111 and the second member 112 to which the bag body 91 is attached is displaced so as to extend. In such a configuration, it is possible to construct the booster device 9 using at least only the bag body 91 and the liquid 32L. In addition to these, there is no particular need for components such as a power source like a battery or an electric motor, or a mechanical drive unit that is mechanically driven by the power from the power source to displace the displacement body 110. Therefore, it becomes possible to provide an extendable member 100 including a booster device 9 that does not have a power source or a portion mechanically driven by the power source and can be realized in a lightweight manner.

[0073] Further, the first member 111 and the second member 112 are biased in a direction approaching each other by an elastic member 120. According to such a configuration, after the liquid 32L in the bag body 91 is vaporized by the radiant heat from the sun, when the radiant heat from the sun no longer acts on the boosting device 9 and the temperature in the bag body 91 drops below the boiling point of the liquid 32L, the gas in the bag body 91 liquefies and the internal pressure of the bag body 91 decreases. As a result, the bag body 91 contracts and loses its rigidity. Then, the force applied to the first member 111 in the direction of separating from the second member 112 due to the expansion of the bag body 91 is released. Here, since the first member 111 and the second member 112 are biased in the direction of approaching each other by the elastic member 120, when the force applied due to the expansion of the bag body 91 is released, the first member 111 and the second member 112 are displaced in the direction of approaching each other by the biasing force of the elastic member 120. In this way, the total length of the first member 111 and the second member 112 shrinks. In this way, the extendable member 100 can be expanded and contracted by repeating the vaporization and liquefaction of the liquid 32L in the bag body 91 according to the presence or absence of the radiant heat from the sun.

[0074] (Other Modification Examples) Note that the boosting device of the present invention, the deployable member using the boosting device, and the extendable member are not limited to the above-described embodiments and their modification examples described with reference to the drawings, and various other modification examples can be considered within the technical scope thereof. For example, when the gas 32A vaporized in the bag bodies 31, 81, 91 liquefies to generate the liquid 32L, thereafter, in order to vaporize the liquid 32L by the radiant heat of the sun, it is preferable to collect the liquid 32L at a position in the bag bodies 31, 81, 91 where sunlight is irradiated. Therefore, while heat collecting parts 51 to 53 are provided at one end of the bag bodies 31, 81, 91, a wick may be provided inside the bag bodies 31, 81, 91 so as to extend from the portion where the heat collecting parts 51 to 53 are located to the whole of the bag body 31, and when the vaporized liquid 32L is liquefied again, the liquid 32L is collected at the position of the heat collecting part by capillary action.

[0075] That is, in this modification, the boosting device includes heat collecting parts 51 to 53 provided at one end of the bag bodies 31, 81, and 91, and a wick provided inside the bag bodies 31, 81, and 91 so as to extend from the portion where the heat collecting parts 51 to 53 are located to the whole of the bag bodies 31, 81, and 91, and when the vaporized liquid 32L is liquefied again, the liquid 32L is recovered to the position where the heat collecting parts 51 to 53 are located. According to such a configuration, by providing the heat collecting parts 51 to 53 at one end of the bag bodies 31, 81, and 91, radiant heat from the sun is collected by the heat collecting parts 51 to 53, and the vaporization of the liquid 32L in the bag bodies 31, 81, and 91 is efficiently performed. The gas generated by the vaporization of the liquid 32L in the bag bodies 31, 81, and 91 expands and spreads throughout the bag bodies 31, 81, and 91. Then, when radiant heat from the sun no longer acts on the boosting device and the temperature in the bag bodies 31, 81, and 91 drops below the boiling point of the liquid 32L, the gas in the bag bodies 31, 81, and 91 liquefies, and the internal pressure of the bag bodies 31, 81, and 91 decreases, so the bag bodies 31, 81, and 91 contract. At this time, since the wick is provided inside the bag bodies 31, 81, and 91, the liquefied liquid 32L is recovered to the position of the heat collecting parts 51 to 53 by the wick. As a result, when radiant heat from the sun is collected again by the heat collecting parts 51 to 53 later, the liquid 32L in the bag bodies 31, 81, and 91 can be vaporized. In this way, the expansion and contraction of the bag bodies 31, 81, and 91 can be efficiently repeated according to the presence or absence of radiant heat from the sun.

[0076] For example, when the boosting device is configured such that the bag body does not expand again after it has once expanded and contracted, even if the liquid vaporizes and then liquefies again, it is not necessary to configure it to vaporize again. Therefore, in such a case, even if the boosting device is configured to include a heat collecting part for the purpose of efficient heat collection, it is not necessary to have a configuration with a wick. Therefore, in this case, the boosting device can be configured to include only the heat collecting part without the wick.

[0077] Also, the bag bodies 31, 81, and 91 may have a double structure. As shown in Fig. 27, the bag bodies 31, 81, 91 of the boosting devices 3, 8, 9 may be provided with a first bag body 301 and a second bag body 302 located outside the first bag body 301 and wrapping the first bag body 301. In this case, the liquid 32L is contained in each of the inside of the first bag body 301 and the space between the first bag body 301 and the second bag body 302.

[0078] That is, in this modified example, a plurality of bag bodies 31, 81, 91 are provided in layers, and include a first bag body 301 and a second bag body 302 located outside the first bag body 301 and wrapping the first bag body 301. The liquid 32L is contained in each of the inside of the first bag body 301 and the space between the first bag body 301 and the second bag body 302. According to such a configuration, when receiving radiant heat from the sun, the liquid 32L contained in the first bag body 301 and the liquid 32L contained in the space between the first bag body 301 and the second bag body 302 are vaporized respectively, causing the first bag body 301 and the second bag body 302 to expand. As a result, outside the first bag body 301, a gas generated by the vaporization of the liquid 32L contained in the space between the first bag body 301 and the second bag body 302 is provided. The gas in the space between the first bag body 301 and the second bag body 302 acts as a heat insulation layer separating the outside of the second bag body 302 from the first bag body 301, thus suppressing the conduction of the heat inside the first bag body 301 to the outside of the second bag body 302. Therefore, when the temperature outside the second bag body 302 is low, the temperature inside the first bag body 301 is lowered below the boiling point of the liquid 32L to delay the liquefaction of the gas, and the duration of the state in which the first bag body 301 expands and the object to be displaced is displaced can be prolonged.

[0079] Also, when a plurality of boosting devices 3, 8, 9 are provided, a plurality of types of liquids 32L with different boiling points may be contained among the plurality of bag bodies 31, 91, 91. Thereby, the boosting timings by the plurality of boosting devices 3, 8, 9 can be made different.

[0080] Further, a plurality of types of liquids 32L having different boiling points may be mixed in one bag body 31, 81, 91. For example, a first substance (boiling point: A °C) in an initial liquid state and a second substance (boiling point: B °C, B < A) in an initial gas state with a boiling point lower than that of the first substance are placed in the bag bodies 31, 81, 91. As a result, when the temperature rises from the initial state and becomes higher than the boiling point of the first substance, the first substance becomes a gas. Then, the pressure inside the bag bodies 31, 81, 91 increases, and the bag bodies 31, 81, 91 expand from the initial volume. Also, when the temperature drops from the initial state and becomes lower than the boiling point of the second substance, the second substance becomes a liquid. Then, the pressure inside the bag bodies 31, 81, 91 is reduced, and the bag bodies 31, 81, 91 contract from the initial volume. In this way, it can be configured such that a force in the expanding direction from the initial state is applied by the force applying device, and a force in the contracting direction opposite to the expanding direction from the initial state is applied.

[0081] In addition, as long as the gist of the present invention is not deviated from, it is possible to select the configurations exemplified in the above embodiments, or to appropriately change them to other configurations.

Explanation of Reference Numerals

[0082] 1A to 1D Deployable member 23g Surface 2, 7, 110 Displaced body 31, 81, 91 Bag body 3, 8, 9 Force applying device 32L Liquid 3A, 8A First force applying device 51 to 53 Heat collecting part 3B Second force applying device 100 Extendable member 21, 71, 111 First member 120 Elastic member 21f, 71f, 111f Surface 301 First bag body 22, 72, 112 Second member 302 Second bag body 22f, 22g, 72f, 112f Surface S1, S11 First rotation axis 23 Third member S2 Second rotation axis

Claims

1. A force - applying device that applies a force to a displaceable body to displace the displaceable body, comprising: a sealed bag body attached to the displaceable body; a liquid contained in the bag body; and displacing the displaceable body by vaporizing the liquid due to radiant heat from the sun, causing the bag body to expand. A force - applying device characterized by the above.

2. The liquid is a substance whose boiling point is equal to or lower than the temperature that can rise when the radiant heat acts during the lunar daytime, and the bag body is made of a flexible resin. The force - applying device according to Claim 1, characterized by the above.

3. The bag body is formed to be plate - shaped or rod - shaped when the liquid vaporizes and expands. The force - applying device according to Claim 1, characterized by the above.

4. Comprising a first member and a second member, and comprising the force - applying device according to any one of Claims 1 to 3 as a first force - applying device, the first member and the second member are joined so as to be relatively rotatable about a first rotation axis provided along each of them, and are provided closed such that their respective surfaces face each other, the bag body of the first force - applying device is provided straddling the first rotation axis and is joined to each of the first member and the second member. A deployable member characterized by the above.

5. Comprising a first member and a second member, and the force - applying device according to any one of Claims 1 to 3, the first member is provided so as to be detachable from the second member while being guided by the second member, when the bag body of the force - applying device expands, the bag body is provided so as to contact each of the opposing surfaces of the first member and the second member. An extensible member characterized by the above.

6. The first member and the second member are urged toward each other by an elastic member. The extensible member according to Claim 5, characterized by the above.

Images