JPH0778669B2 - Rhomboidal trihedral surface model - Google Patents

Description

TECHNICAL FIELD The present invention relates to a geometrical or crystallographic research model.

(B) Prior art When the discovery of a millimetre-sized rhombohedral trihedral aluminum alloy quasicrystal was reported in the United States in 1986, a polyhedral model related to this was demanded. No. 62-024007 is known by the description. Conventionally, the rhomboidal trihedral surface model was known to have only convex pyramids formed by bonding diamond-shaped unit plates to each other in the periphery, but recently a second model with uneven pyramids is newly added. It came to be requested.

(C) Problems to be solved by the invention The above-mentioned two types of rhomboidal trihedrons have complicated pyramid shapes and arrangements and are difficult to make without a sample. There is an inconvenience that a jig is required to bond and solidify with the agent.

(D) Means for solving the problems A means that can be made up of a drawing and its description. If this is explained with reference to the drawing, FIG. 1 is a perspective view of the above two types of models, and FIG. The development view of the unit member of the model constituted by the present invention. FIG. 3 shows an intermediate unit member composed of the above unit members, and FIG. 4 shows a plan view of a completed model composed of the intermediate unit members. Among them, the figure (a) relates to a polyhedron having only convex pyramids, and the figure (b) relates to a polyhedron having uneven pyramids. 2, 3 and 4 in FIG.
Is a unit member and five rhombuses P, Q, R, S, T are arranged in an X shape, and creases are made along the sides of the rhombus R. A symbol + is attached to the top side and a symbol − is attached to the remaining periphery. In FIG. 3, rhombus P and Q of the unit members 3 and 4 described above.
And the side edges of S and T are brought together and solidified by an adhesive to form the intermediate unit members 5 and 6, and the opening M and the tip N are formed.
To form. FIG. 4 shows six intermediate unit members 5 or 6, and the opening M and the tip N are fitted together to assemble the two types of model 1.
Alternatively, 2 is formed and the fitting portion is bonded and solidified with an adhesive to complete the process. In addition, as shown in FIG. 5, among the peripheries of the unit members 3 and 4, by adding a portion W of the bonding margin to the one with the symbol + and making a crease along the perimeter, the joining in the peripheries is performed. It will be easier. Unit members 3, 4, 7 and 8
Ordinary drawing paper is good as a prototype, and when using thick paper, it is advisable to make a cut with a depth of about half the thickness at the boundary of the rhombus to facilitate bending. When using a harder material, rhombus P, Q, R, S, T are cut individually, a flexible thin cloth is pasted and bonded on the back side of the rhombus seam, and all are integrated. Good. In this case, the bonding cost W
Should be made of this thin cloth. In this case, it is a feature of the present invention that the upper and lower two surfaces and the left and right or front and rear two surfaces of the members 5 and 6 are parallel to each other.

(E) Effect of the Invention In the present invention, the intermediate unit members 5 and 6 to be formed are easy to form, and since there are two joints, it is easy to form an accurate shape. In this case, since the diamond-shaped surface R interposed in the center of the members 5 and 6 is located at the position inscribed in the cube, it is easy to make it with this as a guide. Therefore, even an inexperienced person can make it without a sample or a jig, and since the completed model has an accurate shape, the space of the rhomboidal trihedron described in the above-mentioned patent application No. 62-024007 is described. The filling is complete and when you actually look at the model, you get something different from what you get from the drawings and photos.

[Brief description of drawings]

FIG. 1 is a perspective view of a model of a rhomboidal trihedron, FIG. 2 is a development view of a unit member of the model according to the present invention, FIG. 3 is an intermediate unit member constituted by the above unit members, and FIG. 4 is an intermediate unit member. FIG. 5 is a plan view of a completed model constituted by the above, and FIG. 5 is a development view of the above-mentioned unit member with a bonding margin added. Incidentally, (a) is a polyhedron having only convex pyramids,
(B) shows that it relates to a polyhedron having uneven pyramids. Explanation of symbols 1, 2 ... completed model 3, 4 ... model unit member 5, 6 ... model intermediate unit member 7, 8 ... unit members 3, 4 with a bonding margin added to the sides Other examples of unit members P, Q, R, S, T ... Rhombic surface M ... 5 and 6 openings of intermediate unit member N ... 5 and 6 tips of intermediate unit member W ... Unit member 3 Bonding margin added around 4

Claims (4)

[Claims] 1. When constructing a surface model of a rhomboidal trihedron, the ratio of the lengths of the diagonal lines is A rhomboidal trihedral surface model using at least a plurality of unit members of the same shape configured by combining five rhomboid surfaces. 2. One of the rhombic planes is located at the center and 4 at the outer periphery.
A rhomboidal trihedral surface model according to claim 1, characterized in that an X-shaped unit member having a plurality of pieces is used. 3. A unit member in which a bonding margin is added to both side edges of two rhombic surfaces facing each other with the central rhombic surface sandwiched therebetween and the top edges of the remaining two rhombic surfaces to form a unit member. A surface model of a rhomboidal trihedron according to claims 1 and 2. 4. A rhomboidal trihedron according to claims 1, 2 and 3, characterized in that the side edges of the unit members are bonded together to form an intermediate unit member having two triangular pyramids. Surface model.