JPH05302356A - Structure of coupling part between ball coupling of solid truss and lever material - Google Patents

Abstract

PURPOSE:To perform fastening of a coupling bolt, which intercouples a ball coupling and a lever material, from the outside of a coupling. CONSTITUTION:A screw hole 6 is formed in a ball coupling 1 and a coupling metal 7 having a bolt hole 8 is mounted on the end part of a lever material 2. A coupling bolt 3 provided at a central part with a rotary ring engaging part 9 and at a tip part with a male screw part 10 is joined in a screwed-in state with a screw hole 6 of the ball coupling 1 through a bolt hole 8 of the coupling metal 7. A male screw part 10 of the coupling bolt 3, a thurst ring 4 having an inside diameter larger than that outside diameter of the rotary ring engaging part 9, and a rotary ring 5 capable of being fitted in the rotary ring engaging part 9 are mounted on the coupling bolt 3. A screw member 11 capable of protruding toward the male screw 10 of the coupling bolt 3 is joined in a screwed-in state with the thrust ring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint portion structure of a ball joint and a rod member of a space truss constructed by three-dimensionally connecting a plurality of rod members by a ball joint.

[0002]

2. Description of the Related Art Conventionally, various methods have been carried out as a method for joining a ball joint and a rod in a three-dimensional truss. One of the methods is to use a rod or a ball joint for joining the rods. A joining method is known in which a screw hole is provided on one side and a bolt hole is provided on the other side, and a connecting bolt is screwed into the screw hole through the bolt hole.

[0003]

However, since this type of joining method involves inserting a wrench or the like into the ball joint or at the end of the rod or tightening the mounting bolts, simply turning the wrench is not sufficient. It was difficult to screw the bolt into the ball joint.

Therefore, it is difficult to tighten the bolt unless some means such as pushing the head of the bolt with a spring is used so that the connecting bolt can be easily screwed.

Further, once they are joined, it is extremely difficult to correct the dimensional error in manufacturing and working and the joining angle of the rod to the ball joint.

The present invention has been proposed in order to solve the above-mentioned conventional problems. It is possible to securely tighten the connecting bolt between the ball joint and the rod in the space truss from the outside of the joint. An object of the present invention is to provide a joint structure of a ball joint and a rod of a space truss that can be formed.

[0007]

A joint portion structure of a ball joint and a rod of a space truss according to a first aspect of the present invention has a screw hole in the ball joint and a bolt at an end portion of the rod. Attach a joint fitting having a hole, screw a connecting bolt having a male threaded portion at the tip and a rotary ring engaging portion at the center into the screw hole of the ball joint through the bolt hole of the joint fitting, and A propulsion ring having an inner diameter larger than the outer diameter of the connecting bolt and a rotary ring that can be fitted to the rotary ring engaging portion are attached, and a screw member that can project to the male screw portion of the connecting bolt is screwed to the propulsion ring. It is configured by

According to a second aspect of the present invention, in the joint portion structure of the ball joint of the space truss and the rod member according to the second aspect of the present invention, a screw fitting is provided in the ball joint, and a joint fitting having a bolt hole at the end portion of the rod member is provided. Attach the connection bolt from the bolt hole of the joint fitting to the screw hole of the ball joint, and screw a connecting bolt having a male screw portion at the tip and a rotary ring engaging portion at the center, respectively, and attach the male screw of the connecting bolt to the connecting bolt. It is configured by attaching a propulsion ring formed of a nut that can be screwed to the portion and a rotary ring that can be fitted to the rotary ring engaging portion.

According to a third aspect of the present invention, in the joint portion structure of the ball joint of the space truss and the rod member according to the third aspect, a screw fitting is provided in the ball joint, and a joint fitting having a bolt hole at the end portion of the rod member is provided. Attach the connection bolt from the bolt hole of the joint fitting to the screw hole of the ball joint, and screw a connecting bolt having a male threaded portion at the tip end and a key groove continuous in the axial direction at the center portion, and connect the connecting bolt to the connecting bolt. A propulsion ring and a rotary ring each having an inner diameter larger than the outer diameter are attached to the propulsion ring, and a screw member capable of projecting to the male screw portion of the connecting bolt is screwed to the propulsion ring, and the rotary ring can be fitted into the key groove. It is configured by screwing a screw member.

According to a fourth aspect of the present invention, in the joint portion structure of the ball joint and the rod of the space truss according to the fourth aspect, a screw fitting is provided in the ball joint, and a joint fitting having a bolt hole at the end of the rod is provided. Attaching, screwing a connecting bolt having a male screw portion at the tip and a key groove continuous in the axial direction at the center into the screw hole of the ball joint from the bolt hole of the joint fitting, and connecting to the male screw portion of the connecting bolt. A propulsion ring made of a nut is screwed, a rotary ring is attached to the central portion, and a screw member that can be fitted into the key groove is screwed to the rotary ring.

According to a fifth aspect of the present invention, in the joint portion structure of the ball joint and the rod of the space truss according to the fifth aspect, a screw fitting is provided in the ball joint, and a joint fitting having a bolt hole at the end of the rod is provided. Attaching, screwing a connecting bolt that has a male pin at the tip and a key pin at the center into the screw hole of the ball fitting from the bolt hole of the fitting, and the inner diameter of the connecting bolt is larger than the outer diameter of the connecting bolt. Of the connecting ring, and a screw member capable of projecting to the male screw portion of the connecting bolt is screwed into the propulsion ring, and a key groove capable of projecting the key pin is provided on the inner side of the rotating ring. It is configured by being provided along the longitudinal direction of the connecting bolt.

According to a sixth aspect of the present invention, a joint portion structure of a ball joint and a rod member of a space truss according to the sixth aspect is a joint fitting having a screw hole in the ball joint and a bolt hole at an end portion of the rod member. Attaching, screwing a connecting bolt having a male screw portion at the tip and a key pin at the center into the screw hole of the ball joint from the bolt hole of the joint fitting, and a propulsion ring consisting of a nut in the male screw portion of the connecting bolt. Is screwed on, a rotary ring having an inner diameter larger than the outer diameter of the connecting bolt is attached to the central portion, and
A key groove is formed inside the rotating ring along which the key pin can project, along the connecting bolt.

[0013]

【Example】

Example 1. 1 to 5 show the first claim according to the present invention.
An example of a joint structure of a ball joint and a rod of the space truss described in the paragraph is shown. In the drawings, reference numeral 1 is a ball joint, 2 is a rod made of a steel pipe, and 3 is a ball joint 1 and a rod 2. A connecting bolt for connecting the connecting bolts 4 and 4 is a propulsion ring for applying a propulsive force to the connecting bolt 3, and a reference numeral 5 is a rotary ring for rotating the connecting bolt 3.

A threaded hole 6 is formed in the ball joint 1, and a truncated conical fitting 7 is welded to the tip of the rod 2 so as to be integrally attached. Further, a bolt hole 8 is formed at the tip of the fitting 7, and the connecting bolt 3 is inserted in the bolt hole 8.
Has been inserted.

A rotary ring engaging portion 9 having a polygonal cross section, such as a hexagonal cross section, is formed at the center of the connecting bolt 3.
Further, a male screw portion 10 is formed at the tip portion of the connecting bolt 3, and the male screw portion 10 is screwed into the screw hole 6 of the ball joint 1.

A propulsion ring 4 and a rotary ring 5 are attached to the rotary ring engaging portion 9 of the connecting bolt 3.

The inner diameter of the propulsion ring 4 is formed in a circular shape slightly larger than the outer diameter of the connecting bolt 3 (the outer diameters of the rotating ring engaging portion 9 and the male screw portion 10), while the inner diameter of the rotating ring 5 is formed as a connecting bolt. 3 is formed to be slightly larger than the male screw portion 10 of the connecting bolt 3, and is formed in a polygonal shape that can be fitted into the rotating ring engaging portion 9 of the connecting bolt 3. Further, a screw member 11 is screwed into the propulsion ring 4 perpendicularly to the radial direction. The tip of the screw member 11 is strongly pressed against the rotating ring engaging portion 9 of the connecting bolt 3, and the screw ring 11 fixes the propulsion ring 4 and the rotating ring 5,
Therefore, the connecting bolt 3 is also firmly fixed so as not to loosen.

When there is a dimensional error in manufacturing or construction between the ball joint 1 and the rod 2, the propulsion ring 4 and the rotary ring 5 may be appropriately replaced with those having different thicknesses, or a plurality of them may be used. By mounting or the like, these dimensional errors can be easily absorbed. Further, by forming the bolt hole 8 of the joint fitting 7 to be slightly larger than the diameter of the connecting bolt 3, the joint angle of the rod 2 to the ball joint 1 can be corrected to some extent.

When the connecting bolt 3 is tightened, the tip of the screw member 11 is projected to the trough of the male screw portion 8 of the connecting bolt 3 to the extent that this portion is not pressed. When the propeller ring 4 is pressed from above so as not to rotate and the rotary ring 5 fitted into the rotary ring engaging portion 9 of the connecting bolt 3 is turned in the direction in which the bolt is screwed, the connecting bolt 3 exerts propulsive force. The male screw portion 10 of the connecting bolt 3 is screwed into the screw hole 6 of the ball joint 1 in order to move forward while rotating. Therefore, the ball joint 1 and the rod 2 can be connected by the connecting bolt 3.

Next, a method of connecting the ball joint 1 and the rod 2 will be described step by step.

First, the connecting bolt 3 is passed through the bolt hole 8 of the joint fitting 7, the rotary ring 5 and the propulsion ring 4 are attached to the connecting bolt 3 in order, and the screw member 11 of the propulsion ring 4 is attached to the male screw portion 10 of the connecting bolt 3. Tighten until it hits, and connect bolt 3
The rotating ring 4 and the rotating ring 5 are prevented from coming off (see FIG. 3). After that, the joint fitting 7 is integrally welded to the tip of the rod 2.

When the rod 2 is transported, the distance piece 12 made of plastic or the like is attached to the connecting bolt 3 when the propulsion ring 4 and the rotating ring 5 are attached.
The propulsion ring 4 and the rotary ring 5 should be fixed so that they do not move during transportation.

When the rod 2 and the fitting 7 are hot-dip galvanized, the connecting bolt 3 is attached after the plating. In such a case, the connecting bolt 3 is previously attached to the outer peripheral surface of the fitting 7. An insertion hole (13) for the passage is provided.

Next, the rod 2 is installed between the ball joints 1 and 1, the joint fitting 7 is opposed to the ball joint 1, and the male screw portion 10 of the connecting bolt 3 is aligned with the screw hole 6 of the ball joint 1. (See FIG. 4). The distance piece 12 is removed before the rod 2 is installed, the screw member 11 is slightly loosened, and the propulsion ring 4 rotates around the outer circumference of the connecting bolt 3. Subsequently, the propulsion ring 4 is pressed so as not to rotate, and the rotary ring 5 fitted into the rotary ring engaging portion 9 of the connecting bolt 3 is rotated in the direction in which the bolt is screwed, and the screw hole 6 of the ball joint 1 is rotated. The male screw portion 10 of the connecting bolt 3 is screwed into the.

When the male screw portion 10 can be completely screwed into the screw hole 6, the screw member 11 is strongly tightened and the propulsion ring 4 and the connecting bolt 3 are fixed so as not to be loosened (see FIG. 5).

Example 2. FIG. 6 shows an embodiment of the joint portion structure of the ball joint and the rod of the space truss according to the second aspect of the present invention. In the figure, the male screw portion 10 of the connecting bolt 3 is used as the propulsion ring 4. A screwable nut is used. Since other configurations are exactly the same as those of the first embodiment, only the reference numerals are given and the description thereof is omitted. According to this embodiment, since the female thread portion of the nut functions as the thread member 11,
Although the screw member 11 can be omitted, it may be attached as a screw for preventing the propulsion ring 4 from loosening.

Example 3. FIG. 7 shows a second embodiment of the joint structure of the ball joint and the rod of the space truss according to claim 1 of the present invention. In the figure, reference numeral 14 blocks the rotation of the propulsion ring 4. It is a rotation stop pin for. The rotation stop pin 14 is provided so as to project from the side portion of the propulsion ring 4 toward the ball joint 1 side, and the tip end thereof is engaged with an engagement groove 15 formed in the peripheral portion of the screw hole 4 of the ball joint 1.

Since the other construction is exactly the same as that of the first embodiment, only the reference numerals are given and the description thereof is omitted. According to this embodiment, it is sufficient to simply rotate the rotary ring 5 when tightening the connecting bolt 3, and it is not necessary to press the propelling ring 4,
There is an effect that the ball joint 1 and the rod 2 can be easily connected.

A nut that can be screwed into the male screw portion 10 of the connecting bolt 3 may be used as the propulsion ring 4, and if the nut is used, the screw member can be omitted as in the second embodiment. It may be attached as a screw for preventing the propulsion ring 4 from loosening.

Example 4. 8 and 9 show an embodiment of a joint portion structure of a ball joint and a rod of a space truss according to claim 3 of the present invention. In the drawings, reference numeral 16 is a ball joint 1 and a rod 2. A connecting bolt for connecting and, 17 is a propulsion ring for giving a propulsive force to the connecting bolt 16, and reference numeral 18
Is a rotary ring for rotating the connecting bolt 16.

The connecting bolt 16 has a male screw portion 19,
Key grooves 20 continuous in the axial direction are respectively formed in the central portion, and the male screw portion 19 is screwed into the screw hole 6 of the ball joint 1.

The key groove 20 is formed to have a predetermined length along the axial direction of the connecting bolt 16, and the head end of the connecting bolt 16 has a depth for fitting the tip of a screw member 22 described later. Hole
20a is formed.

The propulsion ring 17 is attached to the male screw portion 19 of the connecting bolt 16, and the rotary ring 18 is attached to the rear substantially central portion thereof. Further, the inner diameters of the propulsion ring 17 and the rotary ring 18 are formed in a circular shape slightly larger than the outer diameter of the connecting bolt 16 (outer diameter of the male screw portion 19 and the central portion).
The screw members 21 and 22 are respectively screwed into the shaft in a direction perpendicular to the radial direction. After the tightening of the connecting bolt 16 is completed, the screw member 22 is formed in the deep hole 20a of the key groove 20 so that the connecting bolt 16 does not loosen.
It is strongly tightened.

In such a structure, in order to connect the ball joint 1 and the rod 2 with the connecting bolt 16, first, the rotary ring 18 is attached to the central portion of the connecting bolt 16, and then the male screw portion is attached.
Attach propulsion ring 17 to 19. In addition, a screw member 21 is attached to the propulsion ring 17.
And the screw member 22 is screwed into the rotary ring 18. that time,
The screw member 21 is screwed in so as not to press the valley portion of the male screw portion 19 at the tip, and the screw member 22 is screwed in so as not to press the bottom portion of the key groove 20 of the connecting bolt 16.

When the propeller ring 17 is pressed from above so as not to rotate and the rotary ring 18 is rotated in the direction in which the bolt is screwed, the connecting bolt 16 obtains propulsive force and moves forward while rotating.
The male screw portion 19 is screwed into the screw hole 6 of the ball joint 1. Once
Once the tip of the male screw portion 19 is screwed into the screw hole 6, the rotary ring 18 is then rotated by a rotating jig (not shown) such as a spanner, and the male screw portion 19 is screwed deep into the screw hole 6. When the male screw portion 19 of the connecting bolt 16 can be completely screwed into the screw hole 6, the screw member 22 is strongly tightened in the deep hole 20a of the key groove 20.

Embodiment 5 FIG. 10 shows an embodiment of the joint portion structure of the ball joint and the rod member of the space truss according to claim 4 of the present invention. Propulsion ring for giving 17
As this, a nut that can be screwed into the male screw portion 19 is used. Since other configurations are exactly the same as those of the third embodiment, only the reference numerals are given and the description thereof is omitted.

According to this embodiment, the screw member 21 can be omitted, and the male screw portion 19 is not damaged by overtightening the screw member 21.

In any of the third and fourth embodiments, with the screw member 22 inserted and fixed in the deep hole 20a of the key groove 20, the connecting bolt 16 is moved in the reverse direction (the direction in which the screw is loosened). When turned, the connecting bolt 16 is pulled out from the screw hole 6 of the ball joint 1 while maintaining the protruding length l, so that the dimension L between the ball joints 1 and 1 can be easily adjusted. For example, Figure 11
As shown in (a), (b) and (c), the left and right rods 2b cannot be attached when the space between the ball joints 1a, 1a is too narrow to attach the rod 2a during the truss assembly. Turn the connecting bolts for 2 and 2b in the opposite direction and push up the left and right ball joints 1a and 1a to
By increasing the distance between a and 1a, the left and right ball joints 1a and 1a
The rod 2c can be easily attached between them.

Example 6. FIG. 12 shows an embodiment of a joint portion structure of a ball joint and a rod of a space truss according to claim 5 of the present invention. In the figure, reference numeral 16 indicates a ball joint 1 and a rod 2. Connecting bolt for connecting, 17 is connecting bolt 16
A propulsion ring for applying a propulsive force to the gears, and a reference numeral 18 is a rotary ring for rotating the connecting bolt 16.

A male screw portion 19 is formed at the tip of the connecting bolt 16, a key pin 23 is provided at a central portion thereof so as to vertically project in the radial direction, and the male screw portion 19 is screwed into the screw hole 6 of the ball joint 1. Has been done.

The propulsion ring 17 is attached to the male screw portion 19 of the connecting bolt 16, and the rotating ring 18 is attached to the central portion of the male screw portion 19. Further, the inner diameters of the propulsion ring 17 and the rotary ring 18 are formed in a circular shape slightly larger than the outer diameter of the connecting bolt 16 (outer diameter of the male screw portion 19 and the central portion), and the propeller ring 17 is perpendicular to the radial direction. A screw member (21) is screwed in, and a key groove (20) into which a key pin (23) can be fitted is formed in the inner peripheral portion of the rotary ring (18). The key groove 20 is formed in a predetermined length along the longitudinal direction of the connecting bolt 16, and the head side end of the connecting bolt 16 is closed.

The screw member 21 is strongly tightened in the troughs of the male screw portion 19 so that the connecting bolt 16 does not loosen after the tightening of the connecting bolt 16 is completed.

In such a structure, in order to connect the ball joint 1 and the rod 2 with the connecting bolt 16, first, the rotary ring 18 is attached to the central portion of the connecting bolt 16 and then the male screw portion.
Attach propulsion ring 17 to 19. Further, the key pin 23 is attached to the central portion of the connecting bolt 16, and the screw member 21 is screwed into the propulsion ring 17. It should be noted that a pin hole for attaching the key pin 23 is formed in the center of the connecting bolt 16 in advance, and the key pin 23 is projected to a length capable of sliding in the key groove 20 of the rotary ring 18. Furthermore, the screw member 21 is a male screw part.
Screw it in so that the valleys of 19 are not pressed.

When the propulsion ring 17 is pressed from above so as not to rotate and the rotary ring 18 is rotated to one side, the connecting bolt 16 receives the propulsive force and advances while rotating, so that the male screw portion 19 of the ball joint 1 is moved. It is screwed into the screw hole 6. Once the tip of the male screw portion 19 is screwed into the screw hole 6, the rotary ring 18 is then rotated by a rotating jig (not shown) such as a spanner to screw the male screw portion 19 deep into the screw hole 6. .. When the male screw portion 19 of the connecting bolt 16 can be completely screwed into the screw hole 6, the screw member 21 is strongly tightened.

Embodiment 7 FIG. 13 is a sectional view of an embodiment of the joint structure of the ball joint and the rod member of the space truss according to claim 6 of the present invention. As the propulsion ring 17 for applying propulsive force to the nut, a nut that can be screwed into the male screw portion 19 is used.

Since the other construction is exactly the same as that of the sixth embodiment, only the reference numerals are given and the description thereof is omitted.

If a nut is used as the propulsion ring 17, the screw member 21 can be omitted and the male screw portion 19 will not be damaged by overtightening the screw member 21.

In each of the sixth and seventh embodiments, the small hole 20b is formed at the end of the key groove 20 on the male screw portion 19 side so that the head of the key pin 23 can be seen.
It is possible to confirm that the connecting bolt 16 is completely tightened by driving the key pin 23 from 20b and checking the position of the key pin 23.

Further, FIG. 14 shows a modified example of the rotary ring 18, in which the key groove 20 is formed so as to extend in the longitudinal direction of the rotary ring 18, and the end portion of the key groove 20 on the rod 2 side. On screw member 24
Is screwed in. The screw member 24 is attached for the purpose of closing the end portion of the key groove 20 on the rod 2 side. By forming the end portion of the key groove 20 in this manner, the end of the key groove 20 on the rod 2 side is originally formed. While it is necessary to form the part in a closed state, the necessity is simplified and the key groove 20 is easily processed.

In Examples 3 and 4, the screw member
By fixing 22 to the connecting bolt and rotary ring, ball joints 1a, 1
Although the explanation has been made that adjustment is made between a and, it is needless to say that this idea can be implemented in other embodiments.

[0051]

Since the present invention is constructed as described above, it has the following effects.

The connecting bolt for connecting the ball joint and the rod can be tightened outside the joint portion, and when the connecting bolt is tightened, a propulsion ring acts to obtain a propulsive force to the connecting bolt, which is reliable. You can tighten it.

By appropriately rotating the propulsion ring, it is possible to easily adjust the position (one position on the circumference) of the thread cutting start that matches the engagement between the screw hole of the ball joint and the screw of the connecting bolt. Can be easily combined.

Even if a dimensional error in manufacturing and construction occurs between the ball joint and the rod, adjustment can be easily performed by using different thicknesses for the propulsion ring and the rotary ring, or by increasing or decreasing the number. be able to.

Further, the insertion hole of the connecting bolt of the joint fitting is
Since it is a bolt hole rather than a screw hole, the joint angle of the rod member to the ball joint can be adjusted to some extent.

Further, even if the rod and the joint metal fitting are plated by so-called dribbling, there is no concern that the female screw portion will be clogged by the plating, and therefore, there is no need to drill the screw after the plating.

[Brief description of drawings]

FIG. 1 (a) is a partial plan view of a space truss, FIG. 1 (b).
FIG. 3 is a partial side view of the space truss.

FIG. 2 is a cross-sectional view showing an embodiment of a joint structure of a ball joint and a rod of a space truss according to claim 1 of the present invention.

FIG. 3 is a vertical cross-sectional view showing the structure of the joint portion of the rod material before connection (during transportation) in FIG.

FIG. 4 is a vertical cross-sectional view showing the structure of the joint between the ball joint and the rod member before connection in FIG.

FIG. 5 is a vertical cross-sectional view showing the structure of the joint between the ball joint and the rod member after connection in FIG.

FIG. 6 is a longitudinal sectional view of a first embodiment showing the structure of the joint portion between the ball joint and the rod member of the space truss according to claim 2 of the present invention.

FIG. 7 is a longitudinal sectional view showing another embodiment of the joint structure of the ball joint and the rod of the space truss according to the first aspect of the present invention.

FIG. 8 is a vertical cross-sectional view showing one embodiment of the joint structure of the ball joint and the rod member of the space truss according to claim 3 of the present invention.

9 is a vertical cross-sectional view showing a mounting state of a connecting bolt, a rotating ring and a propulsion ring in the embodiment of FIG.

FIG. 10 is a vertical cross-sectional view showing one embodiment of the joint structure of the ball joint and the rod member of the space truss according to claim 4 of the present invention.

FIG. 11 (a) is a partial plan view of the space truss, FIG.
FIG. 11 (b) is a side view of the space truss during partial assembly, and FIG. 11 (c) is a side view of the space truss.

FIG. 12 is a longitudinal sectional view showing an example of a joint structure of a ball joint and a rod of a space truss according to a fifth aspect of the present invention.

FIG. 13 is a longitudinal sectional view showing an embodiment of a joint structure of a ball joint and a rod of a space truss according to claim 6 of the present invention.

14 is a vertical cross-sectional view showing an example of a joint structure of a ball joint between a ball joint and a rod of a space truss showing a modified example of the rotary ring in the embodiment of FIG. 14 and the rod.

[Explanation of symbols]

1 ... Ball joint, 2 ... Rod, 3 ... Connection bolt, 4 ... Propulsion ring,
5 ... Rotating ring, 6 ... Screw hole, 7 ... Joint fitting, 8 ... Bolt hole, 9 ... Rotating ring engaging part, 10 ... Male screw part, 11 ... Screw member,
12 ... Distance piece, 13 ... Insertion hole, 14 ... Rotation stop pin, 15 ... Engagement groove, 16 ... Connecting bolt, 17 ... Propulsion ring, 18 ... Rotating ring, 19 ... Male screw part 19, 20 ... Keyway, 21 , 22 ... Screw member, 23 ... Key pin, 24 ... Screw member.

Claims (6)

[Claims] 1. In a joint portion structure of a ball joint and a rod of a space truss, which is formed by three-dimensionally connecting a plurality of rods by a ball joint, a screw hole is provided in the ball joint, and the rod is provided. Attach a fitting with a bolt hole to the end of the material, and screw a connecting bolt with a male threaded portion at the tip and a rotary ring engaging portion at the center into the screw hole of the ball joint from the bolt hole of the fitting. Then, a propulsion ring having an inner diameter larger than the outer diameter of the connection bolt and a rotary ring that can be fitted to the rotary ring engagement portion are attached to the connection bolt, and the propulsion ring can project to the male screw portion of the connection bolt. A structure of a joint portion between a ball joint and a rod of a three-dimensional truss, which is formed by screwing together various screw members. 2. In a joint portion structure of a ball joint and a rod of a space truss, which is formed by three-dimensionally connecting a plurality of rods by a ball joint, the ball joint is provided with a screw hole, and the rod is provided. Attach a joint fitting having a bolt hole to the end of the material, and screw a connecting bolt having a male screw portion at the tip and a rotary ring engaging portion at the center from the bolt hole of the joint fitting into the screw hole of the ball joint. Of the space truss, wherein the connecting bolt is provided with a propulsion ring formed of a nut that can be screwed into the male screw portion of the connecting bolt, and a rotating ring that can be fitted into the rotating ring engaging portion. Joint structure of ball joint and rod. 3. In a joint portion structure of a ball joint and a rod of a space truss, which is formed by three-dimensionally connecting a plurality of rods by a ball joint, a screw hole is provided in the ball joint, and the rod is provided. Attach a fitting having a bolt hole to the end of the material, and from the bolt hole of the fitting to a screw hole of the ball joint, connect a connecting bolt having a male thread at the tip and a key groove continuous in the axial direction at the center. Screwing, the propulsion ring and the rotary ring having an inner diameter larger than the outer diameter of the connecting bolt are attached to the connecting bolt, respectively, and the propulsion ring is screwed with a screw member capable of projecting to the male screw portion of the connecting bolt, and A joint portion structure of a ball joint and a rod member of a space truss, wherein a screw member that can be fitted in the key groove is screwed into the rotating ring. 4. A joint portion structure of a ball joint and a rod of a space truss, which is formed by three-dimensionally connecting a plurality of rods by a ball joint, wherein a screw hole is provided in the ball joint, and the rod is provided. Attach a fitting having a bolt hole to the end of the material, and from the bolt hole of the fitting to a screw hole of the ball joint, connect a connecting bolt having a male thread at the tip and a key groove continuous in the axial direction at the center. Screwing, screwing a propulsion ring consisting of a nut to the male screw part of the connecting bolt, attaching a rotating ring larger than the outer diameter of the connecting bolt to the central part, and
A joint portion structure of a ball joint of a space truss and a rod member, wherein a screw member capable of fitting in the key groove is screwed into the rotary ring. 5. In a joint portion structure of a ball joint and a rod of a space truss configured by three-dimensionally connecting a plurality of rods by a ball joint, a screw hole is provided in the ball joint, and the rod is provided. Attach a fitting having a bolt hole to the end of the material, screw a connecting bolt having a male screw portion at the tip and a key pin at the center into the screw hole of the ball fitting through the bolt hole of the fitting, A propulsion ring and a rotary ring each having an inner diameter larger than the outer diameter of the connection bolt are attached to the connection bolt, and a screw member capable of protruding to the male screw portion of the connection bolt is screwed to the propulsion ring, and the rotation ring A joint portion structure of a ball joint and a rod of a space truss, wherein a key groove into which the key pin can project is provided along an axial portion of the connecting bolt in an inner portion. 6. In a joint portion structure of a ball joint and a rod of a space truss constructed by three-dimensionally connecting a plurality of rods by a ball joint, a screw hole is provided in the ball joint, and the rod is provided. Attach a fitting having a bolt hole to the end of the material, screw a connecting bolt having a male screw portion at the tip and a key pin at the center into the screw hole of the ball fitting through the bolt hole of the fitting, A propulsion ring made of a nut is screwed into the male thread portion of the connecting bolt, and a rotary ring having an inner diameter larger than the outer diameter of the connecting bolt is attached to the central portion, and
A joint portion structure between a ball joint and a rod of a space truss, wherein a key groove capable of projecting the key pin is provided inside the rotary ring along the connecting bolt.