JPH10200329A - Spherical approximation frame structure - Google Patents

Abstract

(57) [Summary] [Problem] A spherical approximating frame structure called a basic structure constructed by radially extending a plane four-bar mechanism having a deployment function from a center member, and a large-sized structure formed by combining a plurality of basic structures. It is an object of the present invention to provide a technology for realizing the spherical approximate frame structure at low cost and in a short delivery time. SOLUTION: This is an expandable spherical approximate frame structure in which a plurality of plane four-bar mechanisms 12 are arranged in a radial direction with a center member 1 as a center, and each of the plane four-bar mechanisms 12 has the same geometric shape. And the upper surface member 9 and the lower surface member 11 are radially arranged in a predetermined direction with the center member 1 as a center, and the upper ends of the center member 1 and the fixing member 10 are fixed in a developed state. It is characterized in that it is configured to be located on a spherical surface having a diameter of.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight antenna reflector structure to be mounted on a satellite, particularly to a small foldable storage structure when mounted on a rocket, and to automatically deploy in a predetermined space. The present invention relates to a spherical approximate frame structure used as a basic structure of an antenna reflector of a structure called a deployment antenna.

[0002]

2. Description of the Related Art An umbrella is a well-known structure as a lightweight deployment frame structure. As shown in FIG. 12, the umbrella basically has a structure in which a horizontal member 2 is arranged radially from a center member 1, and a slider 3 sliding on the center member 1 and an oblique member 4 are arranged between the horizontal members 2. . The white circles in the figure represent the freely rotatable pin coupling portions 5. The umbrella thus configured can be stored in a bar shape around the center member 1 by moving the slider 3 downward in the figure.

As shown in FIG. 13, a jump umbrella generally has a slider and a diagonal member in a two-stage configuration. A first slider 3a and a horizontal member 2 are connected to each other by a first diagonal member. The second slider 3b and the first diagonal member 4a are connected by a second diagonal member 4b. And
By inserting a spring 6 between the first slider 3a and the second slider 3b, a function of automatically expanding from a stored state is provided.

The basic concept of an umbrella, that is, the link structure is arranged radially from the center member 1 and
The method of deploying by the sliders 3a and 3b sliding on the upper side has conventionally been used as a basic structure of an antenna reflecting mirror, for example, in Japanese Patent Application No. 63-134331.
FIG. 14 shows an embodiment of the deployable antenna proposed in Japanese Patent Application No. 63-134331, in which a radio wave reflecting surface constituted by a metal film 7 and a cable 8 is attached to the upper part of the cross member 2. .

[0005] When a large antenna reflector is formed by connecting the tips of the cross members 2 using such an umbrella-shaped structure as a basic structure, there is a problem that the rigidity of the connecting portion is reduced. For example, FIG. 15 shows an example of a structure in which three basic structures are combined. In this case, no matter how strong the basic structure is, it is easily deformed at the joint portion 2a of the basic structure. In order to solve the problem caused by the low rigidity of the connecting portion 2a, the structure that is erected in the radial direction from the central member 1 of the basic structure is replaced with a cross member 2 as one beam member. It is effective to use a plane four-bar mechanism constituted by combining a plurality of materials.

That is, a structure in which a plurality of planar four-bar mechanisms are radially arranged with respect to the center member 1 is used as a basic structure, and the distal end of the planar four-bar mechanism is connected to suppress a decrease in rigidity of the connecting portion. Because it can be. As an example of a basic structure having an expandable four-bar mechanism, Japanese Patent Application No.
FIG. 16 shows an embodiment of No. 263930. The basic structure shown in this figure has a plane four-joint mechanism 12 including a center member 1 having a variable length, an upper member 9, a fixing member 10, and a lower member 11 having fixed lengths. It is configured to have a synchronization material 13 substantially parallel to 10. This basic structure is adapted to be joined by joining the fixing members 10 to each other.

Onoda et al. In the four-joint mechanism 12 shown in FIG. 17 make the sum of the lengths of the upper surface member 9 and the center member 1 equal to the sum of the lengths of the lower surface member 11 and the fixing member 10. (Onoda, Ichida, Watanabe, Nakata, Hashimoto, "Two-dimensional deployment truss", The 29th Space Science and Technology Union Lecture Meeting, (198
5), pp. 240-241 and Thorwald,
G. FIG. Mikulas, M .; , Jr. , "Large-
Angle Articulated BeamTru
ss Design Methodology Con
Sidering Offset Joint Mod
eling ", AIAA Journal of Sp
acreft and Rockets, Vol. 3
3, No. 4, 1996, p. 543-549). In FIGS. 16 and 17, for simplification of the description, those excluding the diagonal members are shown.

A method of arranging the plane four-joint mechanism 12 produced by using such a technique in the radial direction from the center member 1 to form a deployable antenna is disclosed in, for example, JP-A-6-166400 and JP-A-5-58396. Has been proposed. FIG. 18 shows the state of deployment of the deployment frame structure proposed in Japanese Patent Application Laid-Open No. 6-166400. By sliding the slider 3 on the center member 1, deployment and storage can be performed in synchronization. FIG. 19 shows a deployment frame structure proposed in Japanese Patent Application Laid-Open No. 5-58396, in which a slider 3 slides on a center member 1 to perform deployment and storage as shown in FIG. Has become.

[0009]

The basic structure is constructed by arranging the plane four-bar mechanism 12 radially, and a frame structure that approximates a curved surface such as an antenna reflector is realized by combining a plurality of basic structures. In this case, it is necessary to clarify how many types of the plane four-bar mechanism 12 and the basic structure are required. This is because a framework that approximates a curved surface like an antenna reflector cannot be realized with one kind of basic structure. At this time, it is necessary to provide a structure with low cost and short delivery time, as well as satisfying structural requirements such as being expandable and approximating a desired curved surface.

In order to reduce the cost and shorten the delivery time, it is effective to configure the plane four-bar mechanism 12 with the same dimensions as much as possible. The effect on economics of using the same structural element is particularly remarkable when a large reflecting mirror surface is created by repeating the basic structure. In the case where a large antenna reflector mounted on a satellite, particularly a large reflector is formed by combining basic structures, the upper surface of each planar four-bar mechanism 12 approximates a spherical surface S as shown in FIG. Designed and manufactured,
The reflecting mirror surface (parabolic surface) 13 and the plane four-bar mechanism 12 are connected by stand-offs (sometimes called studs) 14, and by adjusting the length of each stand-off 14, The concept of absorbing the difference between the spherical surface S of the above and the parabolic surface P of the reflecting mirror surface 13 is widely used.

With such a configuration, there is an effect that the curvature of the frame structure composed of the four-joint mechanism 12 becomes the same everywhere, and cost reduction can be expected. In Japanese Patent Application No. 6-263922, a method of designing a framework structure that can approximate and expand a spherical surface S is disclosed in Japanese Patent Application No. Hei 6-263922, in which a basic structure 10B having the same geometric shape is arranged in the radial direction of the basic structure 10A. Proposed. According to this method, if the number of basic structures further increases in the radial direction from the basic structure 10A determined as the center, only one kind of basic structure needs to be increased. That is, FIG. 22 shows an example in which the basic structure is arranged by the method described in Japanese Patent Application No. 6-263922 centering on the basic structure indicated by 10A, and the same mark represents the same geometric shape. I have.

However, in Japanese Patent Application No. 6-263922,
The basic structure has a macroscopic hexagonal truncated pyramid shape, and it is assumed that the main structural members are erected on the side surfaces of the hexagonal truncated pyramid. This design method cannot be applied to a structure that is installed radially from the central member 1.

Japanese Patent Laid-Open No. 6-3 / 1994 discloses a method for determining the shape of a frame structure having a four-bar mechanism 12 radially installed.
No. 2,293 proposes in claim 3 and the embodiment to configure a curved surface by changing the length of the cross beam of the plane four-bar mechanism. Onoda et al.
Fu, Minesugi, "Two-Dimensions"
fully Deployable Hexapod
Truss, AIAA-95-1279-CP, Pa
rtII, (1995) pp. 1060-1067,
A method of determining a member length so as to minimize an error deviation of storage conditions has been proposed. However, in either method, the geometric shape of the plane four-bar mechanism is changed according to the position where the plane four-bar mechanism is arranged. As the number of types increases, the production cost and the time required for production are inefficient, and the disclosure of how to determine the dimensions of the members is insufficient.

Accordingly, the present invention provides a spherical approximate frame structure called a basic structure in which a plane four-bar mechanism having a deploying function is installed in a radial direction from a center member, and a large-sized structure formed by combining a plurality of basic structures. It is an object of the present invention to provide a technique for realizing the spherical approximate frame structure at low cost and short delivery time.

[0015]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of plane four-bar mechanisms (12) are radially arranged around a center member (1). The expandable spherical approximate frame structure, wherein each of the planar four-bar mechanisms (12) has a variable distance between an upper end and a lower end, and is shared by all the planar four-bar mechanisms (12). A center member (1), an upper surface member (9) having one end rotatably connected to an upper end of the center member (1), and a lower surface member having one end rotatably connected to a lower end of the center member (1) (11), the upper end is rotatably connected to the other end of the upper surface member (9), the lower end is rotatably connected to the other end of the lower surface member (11), and the distance between the upper and lower ends is fixed. The fixing member (10) is located between the fixing member (10) and the center member (1), and has an upper end in the upper surface member (9). A synchronous member (13) rotatably coupled to the center portion and a lower end rotatably coupled to an intermediate portion of the lower surface member (11); and the center member (1) slidably provided in the axial direction. The slider (3) has one end rotatably coupled to the slider (3), and the other end has the fixing member (1).
0) has a diagonal member (4) rotatably connected to one of the upper end and the lower end thereof, and each of the planar four-joint mechanisms (12) has the same geometric shape. And the upper surface material (9) and the lower surface material (11) are radially arranged in a predetermined direction about the center material (1), and the upper ends of the center material (1) and the fixing material (10) Are configured to be located on a spherical surface having a predetermined diameter in a deployed state.

According to a second aspect of the present invention, there is provided an expandable spherical approximate frame structure in which a plurality of plane four-bar mechanisms (12) are radially arranged around a center member (1). The plane four-joint mechanism (12) has a fixed distance between the upper end and the lower end. The center member (1), which is shared by all the plane four-joint mechanisms (12), and the center member (1) An upper surface member (9) having one end rotatably coupled to the upper end, and a lower surface member (1) having one end rotatably coupled to the lower end of the center member (1).
1) and a fixed upper end rotatably coupled to the other end of the upper surface member (9), a lower end rotatably coupled to the other end of the lower surface member (11), and a fixed distance between the upper and lower ends. Wood (10)
A slider (3) provided on the center member (1) so as to be slidable in the axial direction; one end of the slider (3) being rotatably connected to the slider (3); and the other end of the fixing member (10). A diagonal member (4) rotatably connected to one of the upper end and the lower end, and each of the planar four-joint mechanisms (12);
Are composed of the same geometric shape,
The upper surface material (9) and the lower surface material (11) are radially arranged in a predetermined direction about the center material (1), and the other end of the diagonal material (4) is the upper end of the fixing material (10). When it is connected to, the sum of the lengths of the center member (1) and the upper surface member (9) is equal to the sum of the lengths of the lower surface member (11) and the fixing member (10), When the other end of the diagonal member (4) is connected to the lower end of the fixing member (10), the center member (1)
The sum of the lengths of the upper and lower members 11 and 11 is equal to the sum of the lengths of the upper and lower members 9 and 10 and the center member 1 and the fixing member 10 have the same length. It is characterized in that each upper end is located on a spherical surface having a predetermined diameter in the unfolded state.

According to a third aspect of the present invention, in the spherical approximate frame structure according to the first or second aspect, the center member (1) is provided.
The upper ends of the fixing members (10) of the plane four-joint mechanism (12) adjacent to each other with the center as the center are connected using a cable material (17).

According to a fourth aspect of the present invention, a spherical approximate frame structure according to the first, second or third aspect is used as a basic structure (20), and the basic structure (20) is combined with a plurality of sets. A spherical approximate frame structure, in which adjacent basic structures (20) are connected by connecting fixing members (10) to each other, and the central member (1) and the fixing members ( 10) is characterized in that each upper end is located on a spherical surface having a predetermined diameter in the unfolded state.

According to a fifth aspect of the present invention, the spherical approximate frame structure according to the first, second or third aspect is used as a basic structure (20), and the basic structure (20) is combined with a plurality of sets. A spherical approximate frame structure, wherein adjacent basic structures (20) are connected by connecting fixing members (10) to each other, and the fixing members are fixed from the upper end of the center member (1) in each basic structure (20). A first direction in which the radiation direction and the distance to the upper end of (10) are determined, and the positions of these upper ends are on a spherical surface having a predetermined diameter in the unfolded state.
And the position of the upper end of the central member (1) of the basic structure (20) to be joined is at the same distance from the upper ends of two adjacent fixing members (10), and the spherical surface has a predetermined diameter in the expanded state. The position of the upper end of each central member (1) and the upper end of each fixing member (10) is uniquely determined by the second rule of being above.

[0020] Claim 1 configured as described above.
In the invention according to the first aspect, by changing the distance between the upper end and the lower end of the center member (1), the whole can be put into the expanded state or the stored state. Moreover, the center material (1)
Plane four-bar mechanism (1)
Since it can be configured by 2), cost reduction and short delivery time can be achieved.

According to the second aspect of the present invention, by moving the slider (3) along the center member (1), it is possible to put the entirety into the expanded state or the stored state. In addition, since it can be constituted by the plane four-bar mechanism (12) having the same geometric shape with the center member (1) as the center, it is possible to achieve low cost and short delivery time.

According to the third aspect of the present invention, the rigidity relating to the rotation of each planar four-bar mechanism (12) around the central member (1) can be improved by the cable member (17). In addition, since it can be constituted by the plane four-bar mechanism (12) having the same geometric shape with the center member (1) as the center, it is possible to achieve low cost and short delivery time.

According to the fourth aspect of the present invention, since the respective basic structures (20) are connected via the fixing member (10) of the four-joint mechanism (12), a decrease in rigidity of the connecting portion is prevented. be able to. In addition, since the plane four-bar mechanism (12) of each basic structure (20) can be configured with the same geometric shape, it is possible to achieve low cost and short delivery time.

In the invention according to claim 5, in each of the basic structures (20), from the upper end of the center member (1) to the fixing member (1).
The first rule that the radial direction and the distance to the upper end of the basic structure (0) are fixed and the position of each of these upper ends is on a spherical surface having a predetermined diameter, and the center material ( Two fixing members (10) whose upper ends are adjacent to each other
The position of the upper end of each central member (1) and the upper end of each fixing member (10) are uniquely determined by the second rule that they are at the same distance from the upper end of the base member and are on a spherical surface having a predetermined diameter. be able to. Therefore, a plurality of basic structures (20)
By combining these, a larger spherical approximate frame structure can be easily manufactured. In addition, since the planar four-bar mechanism (12) can be formed of the same geometric shape, cost reduction and delivery time can be reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In addition,
1 to 3 show a first embodiment, FIG. 4 shows a second embodiment, and FIG.
Shows a third embodiment, and FIGS. 6 to 11 show a fourth embodiment.

First, a first embodiment will be described with reference to FIGS. Elements common to those of the conventional example shown in FIGS. 12 to 22 are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 1, the spherical approximation frame structure shown in the first embodiment includes a four-joint mechanism 12 having a four-joint mechanism 12 via an upper hub 15 and a lower hub 16 provided above and below the center member 1. It is constituted by those radially arranged in equally divided directions.
The plane four-bar mechanism 12 is constituted by the same one as shown in FIG. However, the plane four-bar mechanism 1 shown in FIG.
2 includes a diagonal member 4 extending from the center member 1 to the upper end of the fixing member 10.
Is specified. That is, as shown in FIG. 2, one end of the diagonal member 4 is connected to the center member 1 via the pin connecting portion 5 and the slider 3, and the other end is connected to the fixing member 10 via the pin connecting portion (not shown). Is joined to the upper end.

The upper surface member 9 has one end connected to the upper end of the center member 1 via the pin connecting portion 5 and the upper hub 15, and the other end connected to the fixing member 10 via the pin connecting portion (not shown). It is connected to the upper end. The lower surface member 11 has one end connected to the lower end of the center member 1 via the pin connecting portion 5 and the lower hub 16, and the other end connected to the lower end of the fixing member 10 via a pin connecting portion (not shown). I have.

Further, in this embodiment, as shown in FIG. 1, the plane four-joint mechanism 12 is constituted by using the synchronization member 13. Then, as shown in FIG. 2, the center member 1 is constituted by the inner tube 1a and the outer tube 1b, so that the distance between the upper end and the lower end of the center member 1 can be changed, thereby enabling expansion and storage. It is configured as follows. In addition, the inner cylinder 1a
A deployment driving force is obtained by a spring (not shown) inserted between the outer cylinder 1b and the outer cylinder 1b. As the inner cylinder 1a is pulled out from the outer cylinder 1b, the frame structure becomes as shown in FIG.
The storage state is changed from (a) to (d).

In the spherical approximate frame structure constructed as described above, the plane four-bar mechanism 12 extending radially around the center member 1 can be formed of the same geometric shape, so that the cost can be reduced. And shortened delivery time can be achieved.

Next, a second embodiment of the present invention will be described with reference to FIG. However, the same reference numerals are given to the elements common to the first embodiment, and the description will be simplified. The second embodiment differs from the first embodiment in that the distance between the upper end and the lower end of the central member 1 is fixed,
Are not provided, and the slider 3 is driven in the axial direction of the center member 1 so that deployment and storage are performed.

The other end of the oblique member 4 is connected to the upper end of the fixing member 10. The sum of the lengths of the center member 1 and the upper member 9 and the length of the lower member 11 and the fixing member 10 are different from each other. And the sum is equal. The slider 3 is driven by a spring (not shown). That is,
When the spherical approximation frame structure is in the housed state, the spring is compressed and held in a deflected state, and when deployed in space, the spring is released and the slider is released by the force of the spring. 3 is moved in the axial direction of the center member 1, whereby the spherical approximate frame structure is automatically developed. In addition, a rotary spring (not shown) is attached to the pin connecting portion 5.
May be provided so that the spherical approximate frame structure is developed by the driving force of the rotary spring.

The spherical approximation frame structure configured as described above has the same operation and effect as the first embodiment.

In the second embodiment, the other end of the diagonal member 4 is connected to the upper end of the fixing member 10, but the other end of the diagonal member 4 is connected to the lower end of the fixing member 10. It may be configured as follows. However, in this case, it is necessary to make the sum of the lengths of the center member 1 and the lower surface member 11 equal to the sum of the lengths of the upper surface member 9 and the fixing member 10.

Next, a third embodiment of the present invention will be described with reference to FIG. However, the same reference numerals are given to the elements common to the first embodiment, and the description will be simplified. The difference between the third embodiment and the first embodiment is that the upper ends of the fixing members 10 of the plane four-joint mechanism 12 adjacent to each other are connected using a tension wire (cable material) 17. .

In the spherical frame structure constructed as described above, the tension wire 17 can improve the rigidity of each plane four-joint mechanism 12 with respect to rotation about the central member 1. In addition, the same operation and effect as those of the first embodiment are obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. However, elements common to the fourth embodiment are denoted by the same reference numerals, and description thereof will be simplified.

As shown in FIG. 6, the spherical approximate frame structure shown in the fourth embodiment has a basic structure 20 based on the spherical approximate frame structure shown in the fourth embodiment, and the basic structure 20 is divided into a plurality of sets. In addition, a large spherical approximate frame structure is constructed. The respective basic structures 20 are connected by connecting the fixing members 10 to each other.

The adjacent basic structure 20 is shown in FIG.
As shown in the figure, the radiation direction (indicated by an arrow) and the distance L from the upper end of the center member 1 to the upper end of the fixing member 10 in each basic structure 20 are determined, and the positions of these upper ends are predetermined in the unfolded state. And the upper end of the central member 1 of the basic structure 20 to be joined is located at the same distance L from the upper ends of two adjacent fixing members 10 and in the unfolded state. The position of the upper end of each central member 1 and the upper end of each fixing member 10 is uniquely determined by the second rule that the center member 1 is on a spherical surface having a predetermined diameter.

That is, the coordinate system in FIG.
It corresponds to a plane, and the center of the spherical surface exists on the z-axis. If rotational symmetry around the z-axis is used, y = 0 and y =
(√3) It is sufficient if a design of 60 degrees surrounded by two planes of x can be made. In the following, the arrangement of the upper surface member 9 will be described, but if the arrangement of the upper surface member 9 can be determined, FIG.
As shown in FIG. 1, when the center member 1 and the fixing member 10 are arranged on a line connecting the center C of the spherical surface and one end and the other end of the upper surface member 9 and one end and the other end of the lower surface member 11 are arranged, It is possible to determine the four-bar mechanism 12. As shown in FIG. 11, even when the pin connecting portion 5 is offset with respect to the upper end and the lower end of the center member 1 and the fixing member 10, the outline 120 connecting the upper end and the lower end of the center member 1 and the fixing member 10 is formed as a plane. There is no essential problem because the four-bar mechanism 12 can be designed with the contour 120 having the upper side as the upper surface member 9.

Hereinafter, the upper end of each center member 1 and the upper end of the fixing member 10 will be described with reference to the nodes a, b, c,.

The position of the node B is such that the distance between the node A and the node B is a predetermined distance L of the plane four-joint mechanism 12, and the node B is arranged on a spherical surface and exists in the xz plane in FIG. Therefore, it can be uniquely determined. The node c is located at a distance L from the node a, exists on the spherical surface, and y =
(√3) It can be uniquely determined because it exists on the plane of x. That is, the nodes B and C are uniquely determined by the first rule that they are located in the predetermined radial direction and the distance L from the node A and are on the spherical surface. Further, it can be said that the first rule is to determine a node based on a distance from a certain node, a condition of being on a spherical surface, and a condition existing on a plane derived from symmetry.

The position of the node E can be uniquely determined because it is at the same distance L from the two adjacent nodes B and C and exists on the spherical surface. That is,
According to the second rule, the position of the node E can be uniquely determined. Then, by repeating the first rule and the second rule, each of the nodes A, B,
C, D, E, F,... Can be uniquely determined.
In FIG. 10, the first rule is represented by an arrow, and the second rule is represented by a diamond.

On the other hand, FIG. 6 shows a state in which the 14 basic structures 20 are connected and expanded.
In the figure, the circles indicate the position of the center member 1 of each basic structure 20. Each basic structure 20, as shown in FIG.
Are connected via an upper hub 18 provided at the upper end of the fixing member 10 and a lower hub (not shown) provided at the lower end of the fixing member 10. This connection is performed by screws 19 a using a connection plate 19.

For example, the distance between the upper end on the center line of the center member 1 and the upper end on the center line of the fixing member 10 is 2400, which is the distance between both ends of the upper surface member 9 in the basic mechanism 20.
mm, the distance between the upper and lower ends on the center line of the fixing material 10 is 600 mm
mm, the distance from the center line of the center member 1 to the pin center line of the pin connecting portion 5 is 22 mm, the distance from the center line of the fixing member 10 to the pin center line of the pin connecting portion 5 is 66 mm, on the center line of the center member 1 When the upper end of the base member and the upper end of the center of the fixed member 10 are all located on a spherical surface having a radius of curvature of 27.5 m, each planar four-bar mechanism extending radially from the center member 11 of each basic structure 20. Angle K between two adjacent 12
Table 1 shows the distribution (see FIG. 8).

[0046]

[Table 1] Here, the basic structure type is, as shown in FIG.
0E. From the survey results in Table 1 above, the basic structure 20E has the largest deviation of the angle K and the maximum is 6
4.6 degrees, the minimum is 54.8 degrees.

In the approximate spherical frame structure constructed as described above, storage and deployment are performed by expanding and contracting the center member 1. In a state in which a plurality of basic structures 20 are connected, it is inefficient to expand and drive each of the basic structures 20. Therefore, the expansion and control of some basic structures are collectively performed. In the case where the spherical approximation frame structure of the second embodiment shown in FIG. 4 is connected as a plurality of basic structures 20, a slider that slides on one of the movable parts of the plane four-bar mechanism 12 or the center member 1 is used. 3 is moved by a spring or a motor to perform storage and deployment.

According to the spherical approximate frame structure, the positions of the upper end of each center member 1 and the upper end of each fixing member 10 can be uniquely determined by the first rule and the second rule. it can. Therefore, a plurality of basic structures 2
By combining 0A to 20E, a larger spherical approximate frame structure can be easily manufactured, and cost reduction and delivery time can be reduced.

Further, the fourteen basic structures 20 composed of 20A to 20E have the same structure of the four-joint mechanism 12 and the connecting portion, and the five types of hubs 15 and 16
Can be constituted only by changing the mounting angle (FIG. 8) of the plane four-bar mechanism in FIG. Therefore,
It is possible to reduce the cost and the delivery time, and practically, there is almost no design overhead due to the reduction of the cost and the delivery time. In addition,
Making the plane four-bar mechanism 12 identical can be realized only by repeating the first rule and the second rule.

If the deviation of the angle K is within 2 degrees,
By adjusting the length of the tension wire 17, the shape of the basic structure 20 can be determined without applying an excessive force to each member of the basic structure 20 or impairing the deployment operation. For this reason, the basic structures 20A, 20B,
For 20C, the angle K is 60.0 degrees, 61.0 degrees,
Using the hubs 15 and 16 of 59.0 degrees, 59.0 degrees, 61.0 degrees and 60.0 degrees, for the basic structures 20D and 20E, the angle K is 58.0 degrees, 61.0 degrees and 62.degree. 0 degrees, 5 degrees
By using the hubs 15 and 16 of 5.0 degrees, 60.0 degrees and 63.0 degrees, all of the 14 basic structures 20 can be covered by the two types of hubs 15 and 16 as a whole. As described above, by reducing the number of types of parts, costs related to design and manufacturing can be significantly reduced, and the delivery time can be shortened.

[0051]

According to the first aspect of the present invention, by changing the distance between the upper end and the lower end of the center member (1), the whole can be put into the expanded state or the stored state. In addition, since it can be constituted by the plane four-bar mechanism (12) having the same geometric shape with the center member (1) as the center, it is possible to achieve low cost and short delivery time.

According to the second aspect of the present invention, by moving the slider (3) along the center member (1), the whole can be put into the expanded state or the stored state. In addition, since it can be constituted by the plane four-bar mechanism (12) having the same geometric shape with the center member (1) as the center, it is possible to achieve low cost and short delivery time.

According to the third aspect of the present invention, the rigidity relating to the rotation of each planar four-bar mechanism (12) around the center member (1) can be improved by the cable member (17). In addition, since it can be constituted by the plane four-bar mechanism (12) having the same geometric shape with the center member (1) as the center, it is possible to achieve low cost and short delivery time.

In the invention according to claim 4, since the respective basic structures (20) are connected via the fixing member (10) of the plane four-joint mechanism (12), a decrease in the rigidity of the connecting portion is prevented. be able to. In addition, since the plane four-bar mechanism (12) of each basic structure (20) can be configured with the same geometric shape, it is possible to achieve low cost and short delivery time.

In the invention according to claim 5, in each of the basic structures (20), the fixing member (1) extends from the upper end of the center member (1).
The first rule that the radial direction and the distance to the upper end of the basic structure (0) are fixed and the position of each of these upper ends is on a spherical surface having a predetermined diameter, and the center material ( Two fixing members (10) whose upper ends are adjacent to each other
The position of the upper end of each central member (1) and the upper end of each fixing member (10) are uniquely determined by the second rule that they are at the same distance from the upper end of the base member and are on a spherical surface having a predetermined diameter. be able to. Therefore, a plurality of basic structures (20)
By combining these, a larger spherical approximate frame structure can be easily manufactured. In addition, since the planar four-bar mechanism (12) can be formed of the same geometric shape, cost reduction and delivery time can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spherical approximate frame structure shown as a first embodiment of the present invention.

FIG. 2 is a side view of a principal part of the spherical approximate frame structure.

FIG. 3 is a perspective view showing a state from deployment to storage of the spherical approximate frame structure.

FIG. 4 is a perspective view of a spherical approximate frame structure shown as a second embodiment of the present invention.

FIG. 5 is a perspective view of a spherical approximate frame structure shown as a third embodiment of the present invention.

FIG. 6 is a plan view of a spherical approximate frame structure shown as a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing a structure of a joint of a fixing member in the spherical approximate frame structure.

FIG. 8 is a perspective view showing the center member of the spherical approximate frame structure.

FIG. 9 is a plan view showing a basic structure that differs depending on the arrangement in the spherical approximate frame structure.

FIG. 10 is a plan view showing a first rule and a second rule for arranging each basic structure in the spherical approximate frame structure.

FIG. 11 is a side view showing a plane four-bar mechanism of each basic structure in the spherical approximate frame structure.

FIG. 12 is a diagram of an umbrella shown as a first conventional example.

FIG. 13 is a view of a jump umbrella shown as a second conventional example.

FIG. 14 is a diagram showing an umbrella-type deployment structure for a deployment antenna shown as a third conventional example.

FIG. 15 is a diagram in which the umbrella-type deployment structure is combined.

FIGS. 16A and 16B are side views of a four-joint mechanism shown as a fourth conventional example, wherein FIG. 16A is a view showing an unfolded state, and FIG.

FIGS. 17A and 17B are side views of a four-joint mechanism shown as a fifth conventional example, wherein FIG. 17A is a view showing an unfolded state, and FIG.

FIGS. 18A and 18B are perspective views of a deployed frame structure shown as a sixth conventional example, wherein FIG. 18A is a view showing a deployed state, and FIG. 18B is a view showing a state in the middle of deployment and storage.

FIG. 19 is a perspective view of a deployment frame structure shown as a seventh conventional example.

FIGS. 20A to 20C are main part side views showing the expanded frame structure, in which FIGS. 20A to 20C show a state from an expanded state to a housed state. FIGS.

FIG. 21 is a diagram showing a configuration in which a parabolic surface is obtained from a spherical surface obtained by a deployment frame structure in a conventional example.

FIG. 22 is a plan view showing an arrangement of a basic structure of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center material 3 Slider 4 Diagonal material 9 Upper surface material 10 Fixed material 11 Lower surface material 12 Planar four-joint mechanism 13 Synchronous material 17 Cable material 20 Basic structure

Claims (5)

[Claims] 1. An expandable spherical approximate frame structure comprising a plurality of four-joint mechanisms (12) arranged radially around a center member (1), wherein each of the four-joint mechanisms (12) The center member (1) whose distance between the upper end and the lower end is variable and which is shared by all the plane four-bar mechanisms (12), and one end of which is freely rotatable at the upper end of the center member (1) And a lower surface member (1) having one end rotatably coupled to a lower end of the center member (1).
1) and a fixed upper end rotatably coupled to the other end of the upper surface member (9), a lower end rotatably coupled to the other end of the lower surface member (11), and a fixed distance between the upper and lower ends. Wood (10)
And between the fixing member (10) and the center member (1), the upper end is rotatably connected to the intermediate portion of the upper surface member (9), and the lower end is freely rotatable to the intermediate portion of the lower surface member (11). A slider (3) provided on the center member (1) so as to be slidable in the axial direction; and one end rotatably connected to the slider (3). The end has a diagonal member (4) rotatably connected to one of the upper end and the lower end of the fixing member (10), and each of the plane four-joint mechanisms (12) has the same geometric shape. And the upper surface member (9) and the lower surface material (11) are radially arranged in a predetermined direction about the center member (1), and the center member (1) and the fixing member (1
0) A spherical approximate frame structure, wherein each upper end is configured to be located on a spherical surface having a predetermined diameter in a developed state. 2. An expandable spherical approximate frame structure comprising a plurality of plane four-joint mechanisms (12) arranged radially around a center member (1), wherein each of the plane four-joint mechanisms (12) is provided. ), The distance between the upper end and the lower end is fixed, and the center member (1) which is shared by all the plane four-bar mechanism (12), and one end is freely rotatable at the upper end of the center member (1). And a lower surface member (1) having one end rotatably coupled to a lower end of the center member (1).
1) and a fixed upper end rotatably coupled to the other end of the upper surface member (9), a lower end rotatably coupled to the other end of the lower surface member (11), and a fixed distance between the upper and lower ends. Wood (10)
A slider (3) provided on the center member (1) so as to be slidable in the axial direction; one end of the slider (3) being rotatably connected to the slider (3); and the other end of the fixing member (10). And a diagonal member (4) rotatably coupled to one of the upper end and the lower end. Each of the planar four-joint mechanisms (12) has the same geometric shape, The upper surface material (9) and the lower surface material (11) are radially arranged in a predetermined direction about the center material (1), and the other end of the diagonal material (4) is the upper end of the fixing material (10). And the length of the center member (1) and the upper member (9), and the lower member (11)
When the other end of the diagonal member (4) is connected to the lower end of the fixing member (10), the center member (1) and the lower surface are formed. The sum of the length of the material (11) and the sum of the lengths of the upper surface material (9) and the fixing material (10) are equal, and each upper end of the center material (1) and the fixing material (10) Is configured to be located on a spherical surface having a predetermined diameter in a deployed state. 3. The frame-like frame structure according to claim 1, wherein the upper ends of the fixing members (10) of the plane four-joint mechanism (12) which are adjacent to each other with the center member (1) being the center are connected by a cable. A spherical approximate frame structure characterized by being joined using a member (17). 4. A spherical approximate frame structure comprising the basic spherical structure according to claim 1, 2, or 3 as a basic structure, and combining the basic structure with a plurality of sets. The adjacent basic structures (20) are joined by joining the fixing members (10) together, and the center member (1) and the fixing members (1) of all the basic structures (20) are joined together.
0) A spherical approximate frame structure, wherein each upper end is configured to be located on a spherical surface having a predetermined diameter in a developed state. 5. A spherical approximate frame structure comprising the basic spherical structure according to claim 1, 2, or 3 as a basic structure, and a plurality of the basic structures (20). The adjacent basic structures (20) are connected by connecting the fixing members (10) to each other, from the upper end of the center member (1) to the upper end of the fixing member (10) in each basic structure (20). The first rule is that the radial direction and distance of the base structure are determined, and the positions of the respective upper ends are on a spherical surface having a predetermined diameter in the expanded state, and the central member (1) of the basic structure (20) to be connected. Is located at the same distance from the upper ends of two adjacent fixing members (10), and is located on a spherical surface having a predetermined diameter in the unfolded state, according to the second rule. Above the upper end and each fixing material (10) Spherical approximation framework, characterized in that it is uniquely determine the position of.