JP2003200699A - Three-way joint for forming spherical structure and spheric structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-way joint for forming a spheric structure capable of manufacturing a skeletal structure approximately in a spheric shape easily and at a low cost and a spheric structure using the three-way joint. <P>SOLUTION: The three-way joint has three mounting parts 21, 23, and 25 respectively consisting of a hole for mounting connecting rods 50, and the mounting parts 21, 23, and 25 are mounted such that the extension lines of central lines L1, L2, and L3 of the three connecting rods 50 cross each other at one point A, and angles θ1, θ2, and θ3 between adjoining connecting rods 50 of the mounted three connecting rods 50 are set to θ1=120°, θ2=120°, and θ3=108°. By mounting the two ends of each connecting rod 50 on each of the mounting parts 21, 23, and 25 of the three-way joint 10, a spheric structure of a spheric skeletal structure having the three-way joint 10 forming a vertex and the connecting rod 50 forming a side, and each of a plurality of equilateral pentagonal surfaces and equilateral hexagonal surfaces. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical structure forming three-way joint suitable for use in forming a substantially spherical skeleton structure, and a spherical structure body using the joint. .

[0002]

2. Description of the Related Art Conventionally, for example, in the field of ornaments such as ornaments and buildings, there is a birdcage-like structure having a skeleton structure close to a spherical body. For this type of conventional skeletal structure spherical body, arc members are used as the rod members constituting the skeletal structure, or complicated joints are used to connect the rod members. And again 1
A plurality of types of bar members and joints are used to form one skeleton structure, which not only increases the number of parts but also complicates the assembly work.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a three-way joint for forming a spherical structure capable of easily and inexpensively manufacturing a skeleton structure having a substantially spherical shape. And to provide a spherical structure using this three-way joint.

[0004]

Means for Solving the Problems The present inventor has found that a spherical structure composed of a polyhedron is composed of a regular pentagon having 12 faces and a regular hexagon having 20 faces, as in the soccer ball shape and the molecular structure model shown in FIG. Focusing on that, it was decided to construct a substantially spherical skeletal structure. That is, as can be seen from FIG. 1, this spherical structure has a structure in which a regular hexagon is connected to each of the five sides of a regular pentagon, and therefore the shape of each vertex is the same at any vertex, and The side lengths are also the same. The present inventor who paid attention to this point installs one kind of three-way joint of a predetermined shape in a portion corresponding to each apex, and connects a connecting rod of the same length to this three-way joint to obtain a substantially spherical shape. The skeletal structure of was constructed.

That is, the spherical structure forming three-way joint according to the present invention is a spherical structure forming three-way joint having mounting portions for connecting connecting rods at three locations. The extension lines of the three connecting rods attached to each other intersect at one point, and the angle between the adjacent connecting rods of the three connecting rods attached is 108 °, 12 respectively.
It was provided so as to be 0 ° and 120 °. The spherical structure can be easily constructed by simply connecting a plurality of one type of connecting rods to the plurality of three-way joints of this one type (same size and shape).

The spherical structure forming three-way joint is constructed by projecting three arm portions from the center toward the outside, and providing a mounting portion consisting of a hole for inserting a connecting rod at the tip end surface of each arm portion. Preferably. According to this structure, there is no useless part in the three-way joint, not only the material cost can be reduced but also the structure is simple and the manufacturing can be easily performed.

In order to construct a spherical structure using the above-mentioned three-way joint, a plurality of three-way joints for forming the spherical structure having the same size and shape and a connecting rod of the same length to be attached to the mounting portion are used. The plurality of connecting rods are provided, and both ends of each connecting rod are attached to each mounting portion of the spherical structure forming three-way joint, so that the spherical structure forming three-way joint is a vertex and each connecting rod is a side. A spherical skeleton structure having a plurality of regular pentagonal faces and a plurality of regular hexagonal faces.

To form a complete sphere, 60 three-way joints and 90 connecting rods are required, but when a spherical skeleton structure composed of a part of a sphere such as a hemisphere is required, it is necessary. Use a sufficient number of three-way joints and connecting rods.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is an overall schematic view of the spherical structure 100 according to the embodiment of the present invention. As shown in the figure, the spherical structure 100 includes 60 three-way joints (three-way joints for forming spherical structures) 10 having the same size and 9 connecting rods 50 having the same size and shape.
There are 0 pieces, and both ends of each connecting rod 50 are three-way joints 1.
Mounting parts 21, 23, 2 to be described below provided in threes of 0
By attaching to the 5, the three-way joint 10 apex,
The spherical skeleton structure has a plurality of regular pentagonal faces (12 faces) and regular hexagonal faces (20 faces) with each connecting rod 50 as a side.

FIG. 3 is an enlarged perspective view of the three-way joint 10. As shown in the figure, the three-way joint 10
Are three arm parts 11, 13, from the center outward.
15 is projected, and the tip surface 1 of each arm portion 11, 13, 15
1a, 13a, 15a are provided with mounting portions 21, 23, 25 which are holes for inserting the connecting rod 50. That is, the mounting portions 21, 2 for mounting the connecting rod 50
3,25 are provided in three places. Each mounting part 2
The inner diameters of the holes forming the holes 1, 23, 25 are substantially the same as the outer diameter of the connecting rod 50, and the ends of the connecting rod 50 can be fitted into the holes. And these three mounting parts 2
1, 23 and 25 are three connecting rods 5 attached to this.
The extension lines of the center lines L1, L2, L3 of 0, 50, 50 intersect at one point A, and the three connecting rods 50, 5 attached
Angles θ1, θ2, θ between 0 and 50 adjacent connecting rods 50
3 is θ1 = 120 °, θ2 = 120 °, θ3 =
It is formed to have an angle of 108 °.

More specifically, as shown in FIG.
When a triangular pyramid (ABCD) with the point A as the apex is formed by the center lines L1, L2, L3 of the connecting rods 50, 50, 50, a surface (ABD) having an angle θ3 = 108 ° and a line segment (AC) The respective mounting portions 21, 23, 25 are formed so that the intersection angle θ4 with respect to is θ4 = 148 ° 18 ′.

A three-way joint 1 having the same size and shape
0 for one type and 90 types for the connecting rods 50 of the same size and shape are prepared. As shown in FIG.
5 is a spherical skeletal structure having a plurality of regular pentagonal faces and a plurality of regular hexagonal faces each having a three-way joint 10 as an apex and each connecting rod 50 as a side, just by being fitted and fixed to each other. Can be formed. This spherical skeleton structure can be used as it is as a decorative article such as a small figurine or as a skeleton of a large dome-shaped building. When using it as the skeleton of a dome-shaped building,
A panel or sheet may be attached to this skeleton.

The three-way joint 10 has a simple structure, and if it is a small-sized one for decoration or the like, it can be easily, precisely and inexpensively cast by a three-way slide type mold. When using it as a building, it is necessary to consider a manufacturing method separately.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and drawings. Can be modified. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the functions and effects of the present invention are exhibited.

[0015]

As described in detail above, according to the present invention, a spherical structure forming three-way joint and a spherical structure (a substantially spherical skeleton structure) using this three-way joint and a connecting rod are used. It has an excellent effect that the body can be produced easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a diagram showing a spherical structure composed of a polyhedron.

FIG. 2 is a spherical structure 10 according to an embodiment of the present invention.
FIG.

FIG. 3 is an enlarged perspective view of the three-way joint 10.

FIG. 4 is an explanatory view of a mounting direction of the three connecting rods 50 to the three-way joint 10.

FIG. 5 is a view showing a state in which three connecting rods 50 are attached to the three-way joint 10.

[Explanation of symbols]

10 Three-way joint (three-way joint for spherical structure formation) 11, 13, 15 Arm parts 11a, 13a, 15a Tip surfaces 21, 23, 25 Attachment part 50 Connecting rod 100 Spherical structure

Claims (3)

[Claims] 1. A three-way joint for forming a spherical structure having mounting portions for mounting connecting rods at three locations, wherein the mounting portions have three connecting rod extension lines intersecting at one point. , And the angles between adjacent connecting rods of the three connecting rods attached are 108 ° and 120, respectively.
A three-way joint for forming a spherical structure, wherein the three-way joint is provided at an angle of 120 °. 2. The three-way joint for forming a spherical structure has three arm portions projecting outward from the center,
The three-way joint for forming a spherical structure according to claim 1, wherein a mounting portion formed of a hole for inserting a connecting rod is provided on a tip end surface of each arm portion. 3. A plurality of spherical structure forming three-way joints according to claim 1 having the same size and shape, and a plurality of connecting rods having the same size and shape to be attached to the mounting portion. By attaching both ends to each mounting part of the spherical structure forming three-way joint, the pentagonal surface and the regular hexagonal surface having the spherical structure forming three-way joint as the apex and each connecting rod as a side are formed into a plurality of surfaces. A spherical structure comprising a spherical skeleton structure having the same.