JPS6259741A - Ball joint of three-dimensional truss - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a ball joint for a space truss.

[Conventional technology]

Conventionally, circular waka 1. Ball joints are widely used because space trusses composed of closed cross-section members such as rectangular cross-sections have no directionality, but in many cases ball joints are used to connect the sphere and the members from the inside of the sphere. The male threads at both ends of the connecting bolt are screwed into both the sphere and the member.

[Problem that the invention seeks to solve]

However, according to the former type of ball joint with such a configuration, the connecting bolt must be attached from the inside of the sphere, and there are 8 fakes in which the sphere is formed to be larger and more hollow, and thicker, so it is not only extremely troublesome to manufacture, but also difficult to manufacture. , it is not easy to handle due to its large weight (it has the disadvantage of inevitably reducing workability. Also, fine adjustment of node spacing to account for member length/errors and construction errors)'J-Extremely It was a hassle.

On the other hand, according to the latter method, the connecting bolt, the sphere, and the members are all connected by screws, so there is a drawback that it is almost impossible to adjust the angle errors of the members due to construction errors, and careful attention is paid to the manufacture and construction of each part. It was necessary to pay attention to

This invention was proposed in order to solve the above-mentioned conventional problems, and it is possible to easily adjust errors in member dimensions and dimensional errors during construction, and to improve construction efficiency and economy. The purpose is to provide fittings.

[Means for solving problems]

In this invention, a plurality of screw holes are provided in the sphere toward its center, end metal fittings are provided at the ends of the member, and a through hole passing through the member in the longitudinal direction is provided in the center thereof. A connecting bolt having a bolt head one size larger than the through hole and a groove continuous in the axial direction of the material is inserted from the back side, and a rotating member is inserted into the penetrating portion of the connecting bolt, and then the nut is inserted. The connecting bolt is screwed into the threaded hole of the sphere by screwing a set screw into the rotating member toward the groove of the connecting bolt, and rotating the rotating member while holding the nut, and then screwing the connecting bolt into the threaded hole of the sphere. The goal is to achieve the following.

〔Example〕

Hereinafter, this invention will be explained with reference to an illustrated embodiment. A joint of a three-dimensional truss consists of a sphere 1, a member 2, and an end metal fitting 3.
, a connecting bolt 4, a rotating member 5, a nut 6, etc.

The sphere 1 is formed hollow by forging or the like, and a plurality of screw holes 7 are formed at predetermined positions toward the center of the sphere 1 according to the mounting direction of the member 2, and the tips thereof reach the hollow part. .

Further, a large hole 8 is formed in one side of the sphere 1 and is continuous with the hollow part, so that the tip of each screw hole 7 can be confirmed through this large hole 8.

The member 2 is formed from a closed steel pipe having a circular or square cross section, and end metal fittings 3, 3 are attached to both ends thereof.

The end hardware 3 is formed into a substantially truncated conical shape by forging or the like, and has a recess 9 of a predetermined diameter and a predetermined depth formed on the back side, and a through hole one size smaller than the bolt head 4a of the connecting bolt 4 on the front side. 10 are formed. The through hole 10 is continuous with the recess 9.

The end fittings 3 thus formed are attached to both ends of the member 2 by welding.

The connecting bolt 4 is inserted into the through hole 10 of the end metal fitting 3 from the back side, that is, from the recess 9 side, and the male threaded portion 4b thereof completely passes through the through hole 10 and completely protrudes from the through hole 10. Further, the bolt head 4a of the connecting bolt 4 touches the peripheral edge of the through hole 10, so that it does not come out from the front side. A groove portion 4c is formed continuously in the longitudinal direction of the male threaded portion 4b of the connecting bolt 4. Further, a rotating member 5 is inserted into the penetrating portion of the male threaded portion 4b of the connecting bolt 4, and then a nut 6 is screwed into the male threaded portion 4b.
The sphere 1 and the member 2 are connected by screwing into the screw hole 7 of the sphere.

A radial screw hole 5a is formed in the rotating member 5, and a set screw 11 is screwed into this screw hole 5a.

The tip of the set screw 11 is engaged with the groove 4c of the connecting bolt 4, thereby preventing the rotating member 5 from rotating and fixing it at a predetermined position in the longitudinal direction of the male threaded portion 4b.

In this configuration, to explain how to assemble the three-dimensional truss, first, the member 2 having the end hardware 3, the connecting bolt 4, the rotating member 5, and the nut 6 attached to both ends is installed between the spheres 1 and 1.

Next, the male threaded portion 4b of the connecting bolt 4 is aligned with the threaded hole 7 of the sphere 1, and the nut 6 is held down to rotate the rotating member 5. As a result, the rotation of the rotating member 5 is caused by the set screw 11
Since the connecting bolt 4 is blocked by the rotating member 5, the connecting bolt 4 rotates together with the rotating member 5, and the male threaded portion 4b of the connecting bolt 4 is screwed into the screw hole 7 of the sphere 1, thereby connecting the sphere 1 and the member 2. Note that the screw engagement between the male threaded portion 4b of the connecting bolt 4 and the screw hole 7 of the spherical body 1 shall be confirmed through the large hole 8 of the spherical body 1.

Errors in member length dimensions and sphere spacing are absorbed by tightening nuts to the member side in the final stage of construction.

〔Effect of the invention〕

Since the present invention has the above configuration, it has the following effects.

■ Since the connecting bolt is screwed into the sphere from the outside rather than from the inside, the bolt inside the sphere.

There is no need to add additional parts, and the spherical body can be made significantly smaller, and the manufacturing cost can be reduced by reducing the weight of the spherical body and saving materials.

Furthermore, construction workability can be improved by reducing the weight of the sphere.

■ Also, since the connecting bolt is simply passed through the through hole of the end metal fitting at the end of the member, if the through hole is made slightly larger, a universal connection can be made between the member and the sphere. angle errors can be easily absorbed.

■ In addition, by tightening the nut to the component side at the final stage of construction, errors in component length dimensions and sphere spacing can be easily corrected, and wobbling of the component can be completely prevented. .

■ In addition, if the end connecting hardware, connecting bolts, and nuts are pre-installed at both ends of the component at the factory, the number of parts will be significantly reduced, and at the construction site, only the sphere and each component need to be compared, making parts management easier. Labor saving can be achieved.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, where Figure 1 is a trunk view of a three-dimensional truss structure, and Figure 2 is a partially broken view showing the state of the joint between the sphere and the member. The side view, Fang 5 and Fang 4 are partially broken exploded side views showing the state of the joint between the sphere and the member. 1... Sphere, 2... Member, 3...
... End hardware, 4... Connection bolt, 5...
... Rotating material, 6 ... Nut, 7 ... Screw hole, 8 ... Large hole, 9 ... Concave part, 10
...Through hole, 11... Set screw. Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] A plurality of screw holes are provided in the sphere toward its center, while end metal fittings are provided at the ends of the member, and a through hole is provided in the center that penetrates in the longitudinal direction of the member. A connecting bolt having a bolt head one size larger than the hole and a groove continuous in the axial direction of the material is inserted, and a rotating member is inserted into the penetrating portion of the connecting bolt, and then a nut is screwed to prevent the rotation. A ball joint for a three-dimensional truss, characterized in that a set screw is screwed into the material toward the groove of the connecting bolt, and the connecting bolt is screwed into the screw hole of the sphere.