JP2017110315A - Folding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive miniaturization of a folding structure in a folded state.SOLUTION: The folding structure 10A includes: a plurality of first plate parts 20A which are formed in a rectangular shape in a plane view having a pair of parallel sides 21A and a pair of extension sides 22A connecting the ends of the parallel sides with each other and which are freely rotatably connected mutually, with the extension sides as the axes; and a plurality of second plate parts 30A which are formed in a polygonal shape in a plane view having a pair of inclined sides 32A extending in a manner approaching to each other as they recede from both ends of the parallel sides of the first plate parts and which are freely rotatably connected relative to each of the first plate parts, with the parallel sides as the axes. The adjacent second plate parts are each freely rotatably connected, with the inclined sides as the axes. The first plate parts are composed of a pair of first plate elements 23A that are each rotatably connected, with a first fold line AVL1 as the axis. The second plate parts are composed of a pair of second plate elements 34A that are each rotatably connected, with a second fold line AVL2 as the axis.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a folding structure.

2. Description of the Related Art Conventionally, a structure having a space therein includes a folding structure configured to be foldable.
Patent Document 1 discloses a helmet capable of flatly folding a hemispherical cap body as a folding structure. In this helmet, a hemispherical cap body is composed of two half cap bodies. Each half-cap body is configured by rotatably connecting one central shell and a plurality of peripheral shells adjacent to the central shell. Further, the peripheral shells corresponding to each other in the two half-cap bodies are connected so as to be rotatable. Then, the central shell and the peripheral shell of each half-cap body are unfolded flat, and the peripheral shells of the two half-cap bodies are folded in two, so that the cap body is folded flat.

JP 2013-170324 A

  By the way, a folding structure in which a space is formed in an unfolded state is required to have portability and storage. However, in the helmet disclosed in Patent Document 1, in a state where the helmet is folded, the two half-caps that are flatly deployed are simply arranged in an overlapping manner. For this reason, in the state which folded the helmet, there exists a problem that the magnitude | size of the helmet seen from the thickness direction of the center shell or the peripheral shell is still large.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a folding structure that can be reduced in size in a folded state to improve portability and storage.

  In order to solve the above problems, the folding structure of the present invention has a pair of parallel sides parallel to each other and a pair of extending sides extending from both ends of one of the parallel sides to both ends of the other parallel side. A plurality of first flat plate parts that are formed in a rectangular shape in plan view with the same angle between the parallel sides and the pair of extending sides, and are connected to each other so as to be rotatable around the extending sides, It is formed into a polygon in plan view having a pair of inclined sides that extend so as to approach each other as the distance from the first flat plate part starts from both ends of the parallel side, and for each first flat plate part with the parallel side as an axis A plurality of second flat plate parts connected in a rotatable manner, and the second flat plate parts adjacent to each other in the arrangement direction of the plurality of first flat plate parts are rotatable with respect to the inclined side as an axis. Connected and before The first flat plate part is composed of a pair of first flat plate elements that are pivotably connected to each other around a first fold line passing through the middle of the pair of parallel sides, and the second flat plate part is formed of the first fold line. It consists of a pair of 2nd flat plate element connected so that rotation was mutually possible centering on the 2nd fold line extended and extended from the edge part of a line | wire.

  In the folding structure, a first line segment connecting both ends of the parallel side between the first flat plate part and the second flat plate part, and the first flat plate part side or the first side from the parallel side. Even if a gap including at least a triangular region surrounded by a pair of second line segments connecting a point located on the first fold line or the second fold line and both ends of the parallel side is formed on the two flat plate part side Good.

  In the folded structure, the gap may be filled with a flexible covering portion.

  Further, in the folding structure, the second flat plate part includes a plurality of divided flat plate parts arranged in a direction in which the second fold line extends and connected to each other so as to be rotatable. The angle formed between the parallel side and the inclined side is greater than the angle formed between the parallel side and the inclined side in another divided flat plate part positioned on the first flat plate part side than the one divided flat plate part. It may be small.

  Further, in the folded structure, the second flat plate part is formed in a polygon in plan view having a top side connecting ends of the extending sides of the pair of inclined sides, and the top side is the parallel side. It may be parallel to.

  In the folding structure, the pair of first flat plate elements and the pair of second flat plate elements are opened to each other along the first fold line and the second fold line, respectively, In a state where the second flat plate part is a flat plate without a crease, it becomes a structure having a space inside, and at least one of the first flat plate part and the second flat plate part has a buffer on the surface facing the space side. A part may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to make the magnitude | size of the folding structure in a folded state smaller than before, and can aim at the improvement of the carrying property and storage property of a folding structure.

It is a perspective view which shows the expansion | deployment state of the folding structure which concerns on 1st embodiment of this invention. It is II-II arrow sectional drawing of FIG. It is the two-dimensional expansion | deployment figure which expand | deployed the folding structure of FIG. 1 on the plane. It is a schematic diagram for demonstrating folding operation | movement in the folding structure which concerns on 1st embodiment of this invention. It is a schematic diagram for demonstrating folding operation | movement in the folding structure which concerns on 1st embodiment of this invention. It is a schematic diagram for demonstrating folding operation | movement in the folding structure which concerns on 1st embodiment of this invention. It is a schematic diagram for demonstrating folding operation | movement in the folding structure which concerns on 1st embodiment of this invention. It is a perspective view which shows the folding state of the folding structure which concerns on 1st embodiment of this invention. It is IX-IX arrow sectional drawing of FIG. It is a perspective view which shows the expansion | deployment state of the folding structure which concerns on 2nd embodiment of this invention. It is XI-XI arrow sectional drawing of FIG. It is the two-dimensional expansion | deployment figure which expand | deployed the folding structure of FIG. 10 on the plane. It is a side view which shows the folding state of the folding structure which concerns on 2nd embodiment of this invention. It is XIV-XIV arrow sectional drawing of FIG. It is an expanded sectional view which shows the principal part of the modification of the folding structure which concerns on 1st embodiment of this invention in an unfolded state. It is a perspective view which shows the modification of the folding structure which concerns on 1st embodiment of this invention in an unfolded state. It is sectional drawing which shows the other modification of the folding structure which concerns on 1st embodiment of this invention in an unfolded state. It is a top view which shows the relative positional relationship of the 1st flat plate part of FIG. 17, a buffer part, and a pressure dispersion part.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the folding structure 10 </ b> A of the present embodiment has a cup shape having a space inside in the unfolded state. As illustrated in FIGS. 1 to 3, the folding structure 10 </ b> A of the present embodiment includes a plurality of first flat plate parts 20 </ b> A and a plurality of second flat plate parts 30 </ b> A. Each flat plate part 20A, 30A is formed in a plate shape or a sheet shape.

Each first flat plate part 20A has a pair of parallel sides 21A, 21A parallel to each other, and a pair of extending sides 22A, 22A extending from both ends of one parallel side 21A to both ends of the other parallel side 21A, In addition, the angle formed by the parallel side 21A and the pair of extending sides 22A and 22A is formed in a quadrangular shape in plan view.
20 A of 1st flat plate parts of this embodiment are formed in the rectangle by planar view. That is, in the first flat plate part 20A of the present embodiment, the pair of parallel sides 21A and 21A have the same length, and the angle formed between the parallel side 21A and the extended side 22A is 90 degrees.

  The first flat plate part 20A is composed of a pair of first flat plate elements 23A and 23A that are pivotably connected to each other about a first fold line AVL1 passing through the middle of the pair of parallel sides 21A and 21A. For this reason, the shape and size of the pair of first flat plate elements 23A and 23A are equal to each other.

  The plurality of first flat plate parts 20A have the same shape and size. The plurality of first flat plate parts 20A are connected to each other so as to be rotatable about the extending side 22A. That is, the plurality of first flat plate parts 20A are arranged in the direction in which the parallel sides 21A extend. In the illustrated example, the number of the first flat plate parts 20A is four, but it is sufficient that the number is at least two.

  Each second flat plate part 30A is rotatably connected to each first flat plate part 20A with the parallel side 21A of each first flat plate part 20A as an axis. For example, the second flat plate part 30A may be connected to only one parallel side 21A of the first flat plate part 20A, but in the present embodiment, the second flat plate part 30A is connected to a pair of parallel sides 21A and 21A of the first flat plate part 20A. ing.

Each of the second flat plate parts 30A has a pair of inclined sides 32A and 32A that start from both ends of the parallel sides 21A of the first flat plate part 20A and extend so as to approach each other as the distance from the first flat plate part 20A increases. It is formed in a square shape. That is, the angle Aα of each inclined side 32A with respect to the parallel side 21A is smaller than 90 degrees. In each second flat plate part 30A, the angle Aα of the pair of inclined sides 32A, 32A with respect to the parallel side 21A of the first flat plate part 20A is equal to each other. The lengths of the pair of inclined sides 32A and 32A are also equal to each other.
The second flat plate part 30A may be formed, for example, in an isosceles triangle in plan view. In the present embodiment, the second flat plate part 30A has a top side 33A that connects the tips in the extending direction of the pair of inclined sides 32A, 32A. It is formed into a leg trapezoid. The top side 33A is parallel to the parallel side 21A of the first flat plate part 20A.

  The above-described second flat plate part 30A is a pair of second flat plates that are pivotally connected to each other about the second fold line AVL2 extending from the end of the first fold line AVL1 in the first flat plate part 20A. It consists of elements 34A and 34A. The pair of second flat plate elements 34A and 34A have the same shape and size.

  The plurality of second flat plate parts 30A arranged in the arrangement direction of the plurality of first flat plate parts 20A have the same shape and size. Two second flat plate parts 30A, 30A adjacent to each other in the arrangement direction of the plurality of first flat plate parts 20A are connected to each other so as to be rotatable about the inclined side 32A.

  The shapes and sizes of the two second flat plate parts 30A and 30A connected to both ends of the same first flat plate part 20A may be equal to each other, for example, but are different from each other in this embodiment. In the present embodiment, the first flat plate part 20A is rectangular, and the two second flat plate parts 30A and 30A arranged at both ends of the first flat plate part 20A are inclined sides of the second flat plate part 30A with respect to the parallel side 21A. The angle Aα of 32A is equal to each other, and the length of the inclined side 32A is different from each other.

In the folding structure 10A of the present embodiment, a gap 40A is formed between the first flat plate part 20A and the second flat plate part 30A.
In the present embodiment, the gap 40A is formed by cutting out a connection portion between the second flat plate part 30A and the first flat plate part 20A. The gap 40A includes a first line segment 41A connecting both ends of the parallel side 21A of the first flat plate part 20A, and a point parallel to the point positioned on the second folding line AVL2 on the second flat plate part 30A side than the parallel side 21A. It has a triangular region surrounded by a pair of second line segments 42A and 42A connecting both ends of 21A.
In the gap 40A, the distance from the intermediate point of the first line segment 41A to the point where the pair of second line segments 42A and 42A intersect (a point on the second fold line AVL2) is the folding operation of the foldable structure 10A described later. In the unfolding operation, at least the first flat plate part 20A and the second flat plate part 30A may be set so as not to interfere with each other.

  In the folding structure 10A of the present embodiment, the gap 40A described above is filled with a covering portion 45A having flexibility. The covering portion 45A may be, for example, paper or a cloth rich in flexibility, but is not limited to this as long as it is a member having flexibility or flexibility. The covering portion 45A may be formed so as not to pass liquids or gases, for example. Further, a small hole such as a vent hole may be formed in the covering portion 45A.

  In the folding structure 10A of the present embodiment, an extended side 22A between two adjacent first flat plate parts 20A, 20A, an inclined side 32A between two adjacent second flat plate parts 30A, 30A, and The parallel side 21A between the first flat plate part 20A and the second flat plate part 30A is a mountain fold line. The first fold line AVL1 and the second fold line AVL2 are valley fold lines. These mountain fold lines and valley fold lines are lines in which one side is a mountain fold or a valley fold when the first flat plate part 20A and the second flat plate part 30A are viewed from one side (outside in FIGS. 1 and 2). It is.

  As shown in FIGS. 1 and 2, the folding structure 10 </ b> A of the present embodiment configured as described above includes a pair of first flat plate elements 23 </ b> A and 23 </ b> A and a pair of second flat plate elements 34 </ b> A and 34 </ b> A. Are opened along the first fold line AVL1 and the second fold line AVL2, and the first flat plate part 20A and the second flat plate part 30A are formed as unfolded flat plates (expanded state). The structure has a space AV1). Hereinafter, the unfolded folded structure 10A will be specifically described.

  In the folded structure 10A in the unfolded state, the two first flat plate parts 20A and 20A adjacent to each other are folded into a mountain fold when viewed from one side of the first flat plate part 20A (outside the internal space AV1). . The plurality of first flat plate parts 20A are arranged so as to form a part of a regular polygon in a cross section parallel to the parallel side 21A (see particularly FIG. 2). The angle Aβ (inner angle) between the other surfaces of the two adjacent first flat plate parts 20A and 20A is a complementary angle (difference between the central angle and 180 °) of the central angle corresponding to one side of the regular polygon. The angle formed between the first flat plate part 20A and the second flat plate part 30A, that is, the internal angle formed between the first fold line AVL1 and the second fold line AVL2, is the second flat plate part 30A with respect to the parallel side 21A of the first flat plate part 20A. According to the magnitude of the angle Aα (see FIG. 3) of the inclined side 32A.

  As shown in FIG. 2, in the folding structure 10 </ b> A of the present embodiment, four first flat plate parts 20 </ b> A are arranged so as to form four sides of a regular octagonal cross section. Since the four first flat plate parts 20A are formed in a rectangular shape that is congruent with each other in plan view, they constitute four side surfaces of a hollow regular octagonal column. 1 and 2 is an axis L1 of a regular octagonal prism, and will be described below as the axis L1 of the folding structure 10A.

  In the folded structure 10A in the unfolded state, two second flat plate parts 30A adjacent to each other in the arrangement direction of the plurality of first flat plate parts 20A when viewed from one side of the second flat plate part 30A (outside the internal space AV1). , 30A are folded in a mountain fold. Further, when viewed from the one surface side of the second flat plate part 30A, the second flat plate part 30A is bent in a mountain fold with respect to the first flat plate part 20A.

  The plurality of second flat plate parts 30A arranged in the arrangement direction of the plurality of first flat plate parts 20A form a part of a regular polygon in a cross section parallel to the parallel side 21A, as in the case of the plurality of first flat plate parts 20A. . In the present embodiment, the four second flat plate parts 30A arranged in the arrangement direction of the four first flat plate parts 20A are formed in an isosceles trapezoidal shape that is congruent with each other in plan view. For this reason, the four second flat plate parts 30A are formed so that the tops of the hollow regular octagonal pyramids having a regular octagonal shape including the parallel sides 21A of the four first flat plate parts 20A are parallel to the parallel sides 21A (on the axis L1). Four side surfaces of the truncated regular octagonal pyramid cut off at (perpendicular plane) are formed.

The folded structure 10A in the unfolded state is formed in a cup shape having an internal space AV1 surrounded by a plurality of first flat plate parts 20A and second flat plate parts 30A. That is, the other surfaces of the plurality of first flat plate parts 20A and the second flat plate parts 30A form the inner surface of the folding structure 10A formed in a cup shape.
The cup-shaped folding structure 10A has an opening end that opens in a direction perpendicular to the axis L1 (downward in FIG. 2). Of the first flat plate part 20A and the second flat plate part 30A that are arranged at both ends in the circumferential direction, the open end is an extended side 22A that is not connected to the other first flat plate part 20A or the other second flat plate part 30A and the inclined side. It is constituted by the side 32A.
Further, in the folded structure 10A in the unfolded state, an opening AO1 that opens in the direction of the axis L1 is formed by the top sides 33A of the plurality of second flat plate parts 30A arranged in the arrangement direction of the plurality of first flat plate parts 20A. . In the present embodiment, the opening AO1 is formed so as to cut out a part of the opening end described above.

  The folding structure 10A of the present embodiment moves the tops of the two second flat plate parts 30A and 30A connected to both ends of the first flat plate part 20A, for example, by moving them in directions away from each other along the axis L1. It can be folded from the developed state. Hereinafter, this point will be described with reference to FIGS.

  FIG. 4 is a diagram obtained by adding a virtual extension line IL that virtually extends the inclined side 32A of each second flat plate part 30A to a position intersecting the axis L1 in the folded structure 10A in the unfolded state. The plurality of virtual extension lines IL extending from the inclined sides 32A of the plurality of second flat plate parts 30A arranged in the arrangement direction of the plurality of first flat plate parts 20A intersect at the same position on the axis L1. The points where the plurality of virtual extension lines IL intersect on the axis L1 are vertices TP1 and TP2 of the plurality of second flat plate parts 30A that are virtually isosceles triangles. Two vertices TP1 and TP2 appear on both sides of the first flat plate part 20A in the direction of the axis L1.

FIG. 5 is a diagram in which one first flat plate part 20A and two second flat plate parts 30A and 30A arranged on both sides thereof are taken out from the folded structure 10A in the unfolded state shown in FIG.
When the folded structure 10A is folded from the unfolded state, the two vertices TP1 and TP2 may be moved away from each other on the axis L1, as shown in FIGS. As a result, each second flat plate part 30A approaches the axis L1, and the pair of second flat plate elements 34A, 34A of each second flat plate part 30A are folded together along the second fold line AVL2. Further, as the first flat plate part 20A approaches the axis L1, the pair of first flat plate elements 23A, 23A of the first flat plate part 20A are folded together along the first fold line AVL1.
Furthermore, the first flat plate element 23A and the second flat plate element 34A are opened from a state where they are bent together to form one flat plate.

  When the folding structure 10A is changed from the folded state to the expanded state, an operation opposite to the folding operation may be performed. That is, in the state shown in FIGS. 6 and 7, the two vertices TP1 and TP2 may be moved in a direction to approach each other on the axis L1.

As shown in FIGS. 8 and 9, in the folded structure 10A, the plurality of first flat plate parts 20A and second flat plate parts 30A form a part of a star shape in a cross section parallel to the parallel side 21A. (See FIG. 9 in particular).
In the folded state illustrated in FIGS. 8 and 9, the first fold line AVL1 and the second fold line AVL2 are not located on the axis L1. For this reason, the angle Aβ between the other surfaces of the first flat plate elements 23A and 23A of the two adjacent first flat plate parts 20A and 20A is the angle Aβ between the other surfaces of the two first flat plate parts 20A and 20A in the unfolded state. Although it is smaller than, it is not zero. That is, the other surfaces of the first flat plate elements 23A and 23A of the two adjacent first flat plate parts 20A and 20A are arranged with a gap therebetween. In order to bring the other surfaces of the first flat plate elements 23A and 23A of the two adjacent first flat plate parts 20A and 20A into contact with each other, the first folding line AVL1 is positioned on the axis L1 as illustrated in FIG. Just do it. The second flat plate element 34A in the folded state forms one flat plate together with the first flat plate element 23A. For this reason, the contact between the other surfaces of the second flat plate elements 34A, 34A of the two adjacent second flat plate parts 30A, 30A is the same as that of the first flat plate part 20A described above.

When the folding structure 10A is folded, for example, one surface of the pair of first flat plate elements 23A, 23A of the first flat plate part 20A is brought into contact with each other, and the pair of second flat plate elements 34A, 34A of the second flat plate part 30A is contacted. One surface may be brought into contact with each other. That is, the folding structure 10A may be folded in the circumferential direction around the axis L1 from the state shown in FIGS.
Further, the folding in the circumferential direction may be performed on the folding structure 10A in the unfolded state, for example. When the folded structure 10A in the unfolded state is folded in the circumferential direction, the tops of the two second flat plate parts 30A and 30A connected to both ends of the first flat plate part 20A move away from each other along the axis L1. To do.

  From the above, in the folded structure 10A in the folded state, the internal space AV1 can be reduced as compared with the expanded state, or the internal space AV1 can be eliminated. Further, in the folded structure 10A in the folded state, the length along the direction of the axis L1 is slightly longer than that in the expanded state, but the plan view of the folded structure 10A can be seen from any direction orthogonal to the axis L1. The area thus obtained can be made smaller than the developed state.

  The folding structure 10A of the present embodiment may be configured by a flexible member that can be bent, such as paper, or may be configured by a rigid member that cannot be bent, for example. When the foldable structure 10A is made of a flexible member, the foldable structure 10A may be configured, for example, by bending one flexible member. When the folding structure 10A is formed of a rigid member, the folding structure 10A is configured such that the flat plate elements 23A and 34A are formed by rigid members, and the flat plate elements 23A and 34A can be rotated with each other by a connecting structure such as a hinge. You may comprise and connect.

As described above, according to the foldable structure 10A of the present embodiment, the size of the foldable structure 10A in the folded state can be made smaller than the conventional size, and the portability and storage properties of the foldable structure 10A can be reduced. Can be improved.
Further, according to the folding structure 10A of the present embodiment, the pair of adjacent first flat plate elements 23A, 23A and the pair of second flat plate elements 34A, 34A are arranged along the first fold line AVL1 and the second fold line AVL2. The folding structure 10A can be easily switched between the unfolded state and the folded state by simply opening and folding each other.
In particular, since the folding structure 10A of the present embodiment is formed in a cup shape in the unfolded state, it can be effectively used as a helmet or the like that has high portability and storage properties and is easy to handle.

  Further, according to the folding structure 10A of the present embodiment, since the gap 40A is formed between the first flat plate part 20A and the second flat plate part 30A, each flat plate element 23A, 34A of the flat plate parts 20A, 30A. Even if it is a rigid member that cannot be deformed, the folded structure 10A can be switched between the expanded state and the folded state. Hereinafter, this point will be specifically described.

  When the gap 40A is not formed between the first flat plate part 20A and the second flat plate part 30A, the folding structure 10A is folded from the unfolded state to the folded state (folding operation) or unfolded from the folded state. In the operation to expand to the state (deployment operation), the first flat plate element 23A and the second flat plate element 34A interfere with each other, and a force for pressing the first flat plate element 23A and the second flat plate element 34A is generated. Explaining mathematically, a self-intersection occurs in which the first flat plate element 23A and the second flat plate element 34A cross each other at these connecting portions. For this reason, unless the first flat plate element 23A and the second flat plate element 34A are bent and deformed, the folding operation and the unfolding operation cannot be performed.

  On the other hand, when a gap 40A is formed between the first flat plate part 20A and the second flat plate part 30A, as illustrated in FIG. 6, the gap 40A is in the middle of the folding operation and the unfolding operation. The first flat plate element 23A and the second flat plate element 34A approach each other so as to decrease, but they do not press each other. That is, interference between the first flat plate element 23A and the second flat plate element 34A can be prevented in the folding operation and the unfolding operation. Accordingly, the folding operation and the unfolding operation can be performed without bending and deforming the first flat plate element 23A and the second flat plate element 34A. The gap 40A is preferably provided to the extent necessary to completely or significantly suppress the occurrence of the self-intersection, and particularly preferably provided to the extent necessary to completely suppress the occurrence of the self-intersection.

Further, according to the folding structure 10A of the present embodiment, the gap 40A between the first flat plate part 20A and the second flat plate part 30A is filled with the covering portion 45A. Thereby, the folding structure 10A in the unfolded state can be effectively used as a container.
Since the covering portion 45A has flexibility, the above-described folding operation and unfolding operation are not hindered. The covering portion 45A can also function as a connection structure that connects the first flat plate part 20A and the second flat plate part 30A to each other so as to be rotatable.

  Further, according to the folding structure 10A of the present embodiment, the second flat plate part 30A has an isosceles trapezoidal shape (planar view) having a top side 33A that connects the tips in the extending direction of the pair of inclined sides 32A, 32A. It is formed in a trapezoidal shape. For this reason, in the folded structure 10A in the unfolded state, an opening AO1 that opens in the direction of the axis L1 can be formed. The opening AO1 can be used as a spout when the folding structure 10A is used as a container for liquid, for example.

  Further, according to the folding structure 10A of the present embodiment, the plurality of first flat plate parts 20A are congruent to each other, and the plurality of second flat plate parts 30A arranged in the arrangement direction of the plurality of first flat plate parts 20A are also congruent to each other. is there. The pair of first flat plate elements 23A and 23A are also congruent to each other, and the pair of second flat plate elements 34A and 34A are also congruent to each other. Thereby, the folding structure 10A can be manufactured with a small number of types of flat plate elements 23A and 34A, and the cost of the folding structure 10A can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. 10 to 14 focusing on differences from the first embodiment.

  As shown in FIGS. 10 and 11, the folding structure 10 </ b> B of the present embodiment has a shape similar to a hollow ellipsoid (including a sphere) having a space inside in the unfolded state. As shown in FIGS. 10-12, the folding structure 10B of this embodiment consists of a flexible member, and similarly to the first embodiment, a plurality of first flat plate parts 20B and a plurality of second flat plate parts 30B. And comprising.

As in the first embodiment, each first flat plate part 20B includes a pair of parallel sides 21B and 21B that are parallel to each other and a pair of extended sides 22B and 22B that connect the ends of the pair of parallel sides 21B and 21B. And the angle formed by the parallel side 21B and the pair of extending sides 22B, 22B is a quadrangular shape in plan view.
The first flat plate part 20B of the present embodiment is formed in an isosceles trapezoidal shape in plan view. That is, in the first flat plate part 20B of the present embodiment, the lengths of the pair of parallel sides 21B and 21B are different from each other, and the angle formed between the parallel side 21B and the pair of extended sides 22B and 22B is not 90 degrees.

  The plurality of first flat plate parts 20B have the same shape and size. The plurality of first flat plate parts 20B are connected to each other so as to be rotatable about the extending side 22B. That is, the plurality of first flat plate parts 20B are arranged in the direction in which the parallel sides 21B extend. In the illustrated example, the number of first flat plate parts 20B is eight, but it may be at least three.

  Similarly to the first embodiment, the first flat plate part 20B includes a pair of first flat plate elements 23B connected to each other so as to be rotatable about a first fold line BVL1 passing through the middle of the pair of parallel sides 21B, 21B. 23B. For this reason, the shape and size of the pair of first flat plate elements 23B and 23B are equal to each other.

  Each second flat plate part 30B is connected to each first flat plate part 20B so as to be rotatable about the parallel side 21B of each first flat plate part 20B. The second flat plate part 30B is connected to a pair of parallel sides 21B and 21B of the first flat plate part 20B.

Each of the second flat plate parts 30B has a pair of inclined sides 32B and 32B extending from both ends of the parallel sides 21B of the first flat plate part 20B so as to approach each other as the distance from the first flat plate part 20B increases. It is formed in a square shape. In each second flat plate part 30B, the angle Bα of the pair of inclined sides 32B and 32B with respect to the parallel side 21B of the first flat plate part 20B is equal to each other. The lengths of the pair of inclined sides 32B and 32B are also equal to each other. In the second flat plate part 30B connected to the short side 21B1 (short parallel side 21B) of the pair of parallel sides 21B and 21B of the first flat plate part 20B, the short side 21B1 and the inclined side 32B of the first flat plate part 20B are provided. The angle Bα1 formed is smaller than the angle Bγ formed by the long side 21B2 (long parallel side 21B) and the extended side 22B of the pair of parallel sides 21B and 21B of the first flat plate part 20B (see particularly FIG. 12).
Each second flat plate part 30B may have, for example, the same top side 33A (see FIGS. 1 and 3) as in the first embodiment, but in this embodiment, the extending direction of the pair of inclined sides 32B and 32B The tips of each other are connected to each other.

  The above-described second flat plate part 30B is a pair of second flat plates that are pivotally connected to each other about a second fold line BVL2 extending from the end of the first fold line BVL1 in the first flat plate part 20B. It consists of elements 34B and 34B. The shape and size of the pair of second flat plate elements 34B, 34B are equal to each other.

Furthermore, in this embodiment, each 2nd flat plate part 30B is provided with the some division | segmentation flat plate parts 35B and 36B which were arranged in the longitudinal direction of 2nd folding line BVL2, and were connected so that rotation was mutually possible. Each divided flat plate part 35B, 36B is configured by the pair of second flat plate elements 34B, 34B described above. Connection lines that connect the two divided flat plate parts 35B and 36B adjacent to each other are parallel to the parallel side 21B of the first flat plate part 20B. In one divided flat plate part 36B, the angle formed between the parallel side 21B and the inclined side 32B of the first flat plate part 20B is different in the divided flat plate part 35B located on the first flat plate part 20B side than the one divided flat plate part 36B. The angle is smaller than the angle formed between the parallel side 21B and the inclined side 32B.
Hereinafter, the plurality of divided flat plate parts 35B and 36B will be described more specifically.

In the present embodiment, each second flat plate part 30B includes two divided flat plate parts 35B and 36B.
Of the two divided flat plate parts 35B and 36B, the first divided flat plate part 35B connected to the parallel side 21B of the first flat plate part 20B is formed in an isosceles trapezoidal shape in plan view. Of the pair of parallel sides 37B and 37B parallel to each other of the first divided flat plate part 35B, the longer side 37B1 (long bottom side 37B1) is connected to the parallel side 21B of the first flat plate part 20B. Each oblique side 32B1 of the first divided flat plate part 35B forms a part of each inclined side 32B of the second flat plate part 30B.

  On the other hand, the second divided flat plate part 36B is formed in an isosceles triangle in plan view. The bottom side 38B of the second divided flat plate part 36B is connected to the shorter side 37B2 (short bottom side 37B2) of the pair of parallel sides 37B, 37B of the first divided flat plate part 35B. That is, the short bottom side 37B2 of the first divided flat plate part 35B and the bottom side 38B of the second divided flat plate part 36B are connection lines that connect the two divided flat plate parts 35B and 36B to each other. Each oblique side 32B2 of the second divided flat plate part 36B forms part of each inclined side 32B of the second flat plate part 30B. The angle formed by the base 38B and the oblique side 32B2 of the second divided flat plate part 36B is smaller than the angle Bα formed by the long base 37B1 and the oblique side 32B1 of the first divided flat plate part 35B.

  The plurality of second flat plate parts 30B arranged in the arrangement direction of the plurality of first flat plate parts 20B have the same shape and size. Two second flat plate parts 30B and 30B adjacent to each other in the arrangement direction of the plurality of first flat plate parts 20B are connected to each other so as to be rotatable about the inclined side 32B. The shapes and sizes of the two second flat plate parts 30B and 30B connected to both ends of the same first flat plate part 20B may be equal to each other, for example, but are different from each other in this embodiment.

  The folding structure 10B of the present embodiment is configured by a flexible member. For this reason, it is shown in the first embodiment between the first flat plate part 20B and the second flat plate part 30B and between the two divided flat plate parts 35B and 36B adjacent in the longitudinal direction of the second fold line BVL2. Such a gap 40A (see FIGS. 1 to 3) is not formed.

In the folding structure 10B of the present embodiment, the extended side 22B between the two adjacent first flat plate parts 20B and 20B, the inclined side 32B between the two adjacent second flat plate parts 30B and 30B, and the first Sides between the two divided flat plate parts 35B and 36B adjacent to each other in the longitudinal direction of the two-fold line BVL2 (short bottom side 37B2 and bottom side 38B) are mountain fold lines. The first fold line BVL1 and the second fold line BVL2 are valley fold lines. The mountain fold line and the valley fold line are lines in which one side is a mountain fold or a valley fold when the plurality of first flat plate parts 20B and the second flat plate parts 30B are viewed from the one surface side (outside in FIGS. 10 and 11). It is.
Further, in the two-dimensional development view of the folding structure 10B illustrated in FIG. 13, a region MB is formed between the two second flat plate parts 30B and 30B arranged in the arrangement direction of the plurality of first flat plate parts 20B. Has been. This area MB functions as a margin for connecting two adjacent second flat plate parts 30B, 30B. That is, in order to connect two adjacent second flat plate parts 30B and 30B, the region MB is folded and bonded at a fold line BML3 that is parallel to the second fold line BVL2 and bisects the region MB. What is necessary is just to fix in the state folded by the agent etc.

  As shown in FIGS. 10 and 11, the folding structure 10 </ b> B of the present embodiment configured as described above includes a pair of first flat plate elements 23 </ b> B and 23 </ b> B and a pair of second flat plate elements 34 </ b> B and 34 </ b> B. Are opened to each other along the first fold line BVL1 and the second fold line BVL2, and the first flat plate part 20B and the divided flat plate parts 35B and 36B are formed into flat plates (folded state), and the space BV1 ( The structure has an internal space BV1). Hereinafter, the unfolded folded structure 10B will be specifically described.

  In the folded structure 10B in the unfolded state, the two first flat plate parts 20B and 20B adjacent to each other are folded in a mountain fold when viewed from one surface side of the first flat plate part 20B (outside the internal space BV1). . The plurality of first flat plate parts 20B are arranged so as to form a regular polygon in a cross section parallel to the parallel side 21B (see particularly FIG. 11). An angle Bβ (inner angle) between the other surfaces of the two adjacent first flat plate parts 20B and 20B is a complementary angle (difference between the central angle and 180 °) of the central angle corresponding to one side of the regular polygon. The angle formed by the first flat plate part 20B and the second flat plate part 30B, that is, the internal angle formed by the first fold line BVL1 and the second fold line BVL2, is the second flat plate part 30B with respect to the parallel side 21B of the first flat plate part 20B. This corresponds to the magnitude of the angle Bα (see FIG. 12) of the inclined side 32B.

  As shown in FIG. 11, in the folding structure 10 </ b> B of the present embodiment, eight first flat plate parts 20 </ b> B are arranged so as to form sides of a regular octagonal cross section. The eight first flat plate parts 20B are formed in an isosceles trapezoid shape that is congruent with each other in plan view. For this reason, the eight first flat plate parts 20B are cut off the tops of the hollow regular octagonal pyramids having the regular octagons including the long sides 21B2 as the bottoms in the planes including the short sides 21B1 of the eight first flat plate parts 20B. Each side of the truncated octagonal pyramid is configured. Reference sign L2 in FIGS. 10 and 11 is the axis L2 of the truncated regular octagonal pyramid, and in the following description, it will be described as the axis L2 of the folding structure 10B.

  In the folded structure 10B in the unfolded state, two second flat plate parts 30B adjacent to each other in the arrangement direction of the plurality of first flat plate parts 20B when viewed from the one surface side of the second flat plate part 30B (outside the internal space BV1). , 30B are folded in a mountain fold. Further, as viewed from the one surface side of the second flat plate part 30B, the second flat plate part 30B is bent in a mountain fold with respect to the first flat plate part 20B. Further, when viewed from the one surface side of the second flat plate part 30B, the two divided flat plate parts 35B and 36B constituting each second flat plate part 30B are folded in a mountain fold.

The plurality of first divided flat plate parts 35B arranged in the arrangement direction of the plurality of first flat plate parts 20B is a cross section parallel to the parallel side 37B (perpendicular to the axis L2), as in the case of the plurality of first flat plate parts 20B. Part of a regular polygon. In the present embodiment, the eight first divided flat plate parts 35B arranged in the arrangement direction of the eight first flat plate parts 20B have the same isosceles trapezoidal shape in plan view as in the case of the plurality of first flat plate parts 20B. Since it is formed, each side surface of the truncated regular octagonal pyramid is formed.
On the other hand, the eight second divided flat plate parts 36B arranged in the arrangement direction of the eight first flat plate parts 20B are formed in isosceles triangles that are congruent to each other in plan view, and thus constitute each side of a regular octagonal pyramid. .

  The folded structure 10B in the unfolded state has a shape similar to a hollow ellipsoid (including a sphere) having an internal space BV1 surrounded by a plurality of first flat plate parts 20B and second flat plate parts 30B (hereinafter referred to as a hollow shell shape). Called). That is, the other surfaces of the first flat plate parts 20B and the second flat plate parts 30B form the inner surface of the folded structure 10B formed in a hollow shell shape.

  In the unfolded folded structure 10B, the internal space BV1 does not need to communicate with the outside, for example, but in the present embodiment, it can communicate with the outside via the slit SL. The slit SL is formed by not connecting the adjacent first flat plate parts 20B and the adjacent second flat plate parts 30B to each other in one extending side 22B and the corresponding inclined side 32B. Arbitrary fasteners such that, for example, the slit SL does not become large or the slit SL is closed on the extended side 22B of the first flat plate part 20B and the inclined side 32B of the second flat plate part 30B forming the slit SL. May be provided.

  The folding structure 10B of the present embodiment is configured by a flexible member. For this reason, the folding structure 10B of this embodiment is similar to the case of 1st embodiment, for example, the top part of two 2nd flat plate parts 30B and 30B connected to the both ends of the 1st flat plate part 20B is set to axis L2. Can be folded from the unfolded state described above. Moreover, the folding structure 10B of this embodiment can also be folded in the circumferential direction by opening the slit SL from the above-described expanded state, for example.

  As explained in the first embodiment, when the folding structure 10B of the present embodiment is folded or unfolded, the connecting portion between the first flat plate part 20B and the second flat plate part 30B, the same second In the flat plate part 30B, self-intersection occurs at the connecting portion between the adjacent divided flat plate parts 35B and 36B. However, in the folding structure 10B of the present embodiment, the first flat plate element 23B of the first flat plate part 20B and the second flat plate element 34B of the second flat plate part 30B are bent and deformed, so that the folding operation and the unfolding operation are hindered. There is nothing.

As shown in FIGS. 13 and 14, in the folding structure 10B of the present embodiment that is folded in the same manner as the first embodiment, a plurality of first flat plate parts 20B and second flat plate parts 30B are parallel to the parallel sides 21B. They are arranged so as to form each side of the star shape in cross section (see particularly FIG. 14).
In the folded state illustrated in FIG. 14, the first fold line BVL1 and the second fold line BVL2 are not located on the axis L2. Therefore, the angle Bβ between the other surfaces of the first flat plate elements 23B, 23B of the two adjacent first flat plate parts 20B, 20B is the angle βB between the other surfaces of the two first flat plate parts 20B, 20B in the unfolded state. Although it is smaller than, it is not zero. That is, the other surfaces of the first flat plate elements 23B and 23B of the two adjacent first flat plate parts 20B and 20B are arranged with a gap therebetween. In order to bring the other surfaces of the first flat plate elements 23B and 23B of the two adjacent first flat plate parts 20B and 20B into contact with each other, the first fold line BVL1 and the second fold line BVL2 are positioned on the axis L2. Good. The second flat plate element 34B in the folded state forms one flat plate together with the first flat plate element 23B. For this reason, the contact of the other surfaces of the second flat plate elements 34B, 34B of the two adjacent second flat plate parts 30B, 30B is the same as that of the first flat plate part 20B described above.

  When the folding structure 10B is folded, for example, one surface of the pair of first flat plate elements 23B, 23B of the first flat plate part 20B is brought into contact with each other, and the pair of second flat plate elements 34B, 34B of the second flat plate part 30B is contacted. One surface may be brought into contact with each other. That is, the folding structure 10B may be folded in the circumferential direction centering on the axis L2 by opening the slit SL from the state shown in FIGS.

  From the above, in the folded structure 10B in the folded state, the internal space BV1 can be made smaller than the expanded state, or the internal space BV1 can be eliminated, as in the first embodiment. Further, in the folded structure 10B in the folded state, the length along the direction of the axis L2 is slightly longer than that in the expanded state, but the plan view of the folded structure 10B is seen from any direction orthogonal to the axis L2. The area thus obtained can be made smaller than the developed state.

According to the folding structure 10B of this embodiment, there exists an effect similar to 1st embodiment.
Moreover, according to the folding structure 10B of this embodiment, each 2nd flat plate part 30B is comprised by several division | segmentation flat plate parts 35B and 36B. In addition, the angle of the inclined side 32B with respect to the parallel side 21B of the first flat plate part 20B decreases as the divided flat plate parts 35B and 36B are located farther from the first flat plate part 20B. For this reason, the shape of the part comprised by several division | segmentation flat plate parts 35B and 36B among the folding structure 10B made into the unfolded state can be approximated to a spherical shape. That is, the shape of the folded structure 10B in the unfolded state can be approximated to the shape of a hollow sphere or ellipsoid.

In particular, since the folding structure 10B of the present embodiment can be formed into a hollow shell such as a hollow sphere or an ellipsoid when deployed, it is effectively utilized as a packaging bag such as a fruit bag for wrapping fruits before harvesting. be able to.
Specifically, when the pre-harvest fruit is wrapped by the folding structure 10B of the present embodiment, the folded structure 10B in the unfolded state is held by the fruit simply by wrapping the fruit while unfolding the folded structure 10B from the folded state. That is, it is possible to prevent the unfolded folded structure 10B from falling from the fruit. In other words, the work of wrapping fruits before harvesting can be greatly reduced.

Moreover, since the folding structure 10B of this embodiment can be easily switched between a folded state and an unfolded state, it can also be provided as a reusable fruit bag or the like.
In addition, the folding structure 10B of the present embodiment can be manufactured by a flexible member such as a piece of paper, and since the folding line is simplified, it can be manufactured in large quantities as a fruit bag or the like at low cost. Can be produced.

  In the folding structure 10B of the present embodiment, the second flat plate part 30B (particularly the second divided flat plate part 36B) arranged on one end side of the first flat plate part 20B is the top side 33A similar to the first embodiment. (See FIGS. 1 and 3), in the folded structure 10B in the expanded state, an opening that opens in the direction of the axis L2 can be formed as in the case of the first embodiment. Therefore, when utilizing the folding structure 10B of this embodiment as a fruit bag, a fruit basket can be more easily passed through the opening of the folding structure 10B.

  Various configurations of the folding structure 10B of the second embodiment not described in the first embodiment can be applied to the folding structure 10A of the first embodiment. Various configurations of the folding structure 10A of the first embodiment that are not described in the second embodiment can be applied to the folding structure 10B of the second embodiment.

  Although the present invention has been described in detail with two embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

The folding structure 10A of the first embodiment may be configured to be able to be held in an unfolded state, for example.
In order to hold the folded structure 10A of the first embodiment in the unfolded state, for example, the top portions (top side 33A) of the two second flat plate parts 30A and 30A connected to both ends of the same first flat plate part 20A. It is conceivable to fix the distance between them by a flexible elongated holder such as a string or a belt.
The holder may be arranged so as to extend in the direction of the axis L1 between the top portions (top side 33A) of the two second flat plate parts 30A and 30A. In other words, both ends of the holder may be connected to the points of the top portions (top side 33A) of the two second flat plate parts 30A and 30A whose circumferential positions around the axis L1 coincide with each other.

  In a state where the distance between the tops of the two second flat plate parts 30A and 30A is fixed by the holder, the tops of the two second flat plate parts 30A and 30A do not move in the direction away from the axis L1. That is, the folding structure 10A can be held in the unfolded state.

  For example, the holder described above may be attached to two circumferential positions that are symmetrical to each other with respect to a position at which the folded structure 10A in the deployed state is equally divided in the circumferential direction. In this case, the folded structure 10A can be held in the expanded state in a more stable state.

  Further, in order to hold the folded structure 10A in the unfolded state, for example, in the angle Aβ formed by the two first flat plate parts 20A and 20A adjacent to each other or in the arrangement direction of the plurality of first flat plate parts 20A and 20A. It is conceivable to fix the angle (angle Aβ) formed by the two adjacent second flat plate parts 30A and 30A. Hereinafter, a configuration example for fixing the above-described angle will be described. Here, a configuration for fixing the angle between the two first flat plate parts 20A and 20A is given as an example, but the same applies to the angle between the two second flat plate parts 30A and 30A.

For example, as shown in FIG. 15, the plurality of first flat plate parts 20 </ b> A are formed in a thick plate shape. In addition, the two first flat plate parts 20A, 20A adjacent to each other, the corners of the side surface 27A (the surface corresponding to the extending side 22A) and the inner surface (other surface) 26A are used as the axes 29A, and the two first The flat plate parts 20A and 20A are rotatably connected to each other.
Further, the side surfaces 27A of the two first flat plate parts 20A and 20A located at the boundary portion between the two first flat plate parts 20A and 20A are inclined. Specifically, the sum of the angles Aβ1 and Aβ2 formed by the side surface 27A and the outer surface (one surface) 25A of the two first flat plate parts 20A and 20A is the two first flat plate parts 20A and 20A in the unfolded folded structure 10A. The side surface 27A of each first flat plate part 20A is inclined with respect to the outer surface 25A and the inner surface 26A so that the angle Aβ formed by 20A is mutually equal. The angles Aβ1 and Aβ2 of the two first flat plate parts 20A and 20A described above may be equal to each other, for example.

Further, on the outer surface 25A side of the two first flat plate parts 20A, 20A, two adjacent ones such as a belt or a string member 47A such as a belt are stretched between both ends in the arrangement direction of the first flat plate parts 20A. The first flat plate parts 20A and 20A are applied with a force in a direction in which they open.
Thereby, in the folded structure 10A in the unfolded state, the inclined side surfaces 27A and 27A of the two adjacent first flat plate parts 20A and 20A are held in contact with each other. That is, the angle Aβ formed by two adjacent first flat plate parts 20A and 20A can be fixed. Thereby, the folding structure 10A can be held in the unfolded state.

  The above-described structure for holding the folding structure in the unfolded state can also be applied to the folding structure 10B of the second embodiment.

  The folding structure 10A of the first embodiment may not include the covering portion 45A that fills the gap 40A, for example. In this case, the internal space AV1 of the folded structure 10A in the unfolded state communicates with the outside through the gap 40A. In this case, the folding structure 10A can be effectively used as a breathable helmet, container, bag, or the like.

  Moreover, in the folding structure 10A of the first embodiment, the gap 40A between the first flat plate part 20A and the second flat plate part 30A cuts out at least one of the first flat plate part 20A and the second flat plate part 30A. May be formed. That is, the gap 40A may be formed, for example, by cutting out a connection portion with the second flat plate part 30A in the first flat plate part 20A. In this case, the gap 40A is a pair of second lines connecting the first line segment 41A and a point located on the first folding line AVL1 on the first flat plate part 20A side with respect to the parallel side 21A and both ends of the parallel side 21A. You may have a triangular area surrounded by minutes.

  In the first embodiment, the gap 40A between the first flat plate part 20A and the second flat plate part 30A may include at least the triangular region described above. That is, the gap 40A may have, for example, a semicircular region or a semi-elliptical region that circumscribes the triangular region.

  When the folding structure 10A of the first embodiment is made of a flexible member, for example, the gap 40A may not be formed between the first flat plate part 20A and the second flat plate part 30A.

  Further, in the folding structure 10A of the first embodiment, the first flat plate element 23A is additionally connected to the extending side 22A of the first flat plate part 20A located at one end or the other end in the circumferential direction in the unfolded state. Also good. Similarly, for example, a second flat plate element 34A may be additionally connected to the inclined side 32A of the second flat plate part 30A located at one end or the other end in the circumferential direction. In other words, the opening end of the folding structure 10A in the unfolded state may be configured by, for example, the first fold line AVL1 of the first flat plate element 23A and the second fold line AVL2 of the second flat plate element 34A. In the folding structure 10A of the first embodiment, the angle Aα formed by the inclined side 32A of the second flat plate part 30A with respect to the parallel side 21A is two second flat plate parts 30A arranged at both ends of the first flat plate part 20A. May be different from each other.

Moreover, about the folding structure 10A of the first embodiment, in the two-dimensional development view illustrated in FIG. 3, for example, similarly to the region MB (see FIG. 12) of the second embodiment, an arrangement of a plurality of first flat plate parts 20A Parts may be formed in a region MA connecting the two second flat plate parts 30A, 30A arranged in the direction. In other words, the folding structure 10A is arranged between two adjacent second flat plate parts 30A and 30A, and each second flat plate part 30A is centered on each inclined side 32A of the two second flat plate parts 30A and 30A. A connecting part 24A (see FIG. 16) connected to be rotatable may be provided. In this case, the connection part 24A may be configured to be foldable around the fold line AML3 that is parallel to the second fold line AVL2 and bisects the connection part 24A in the two-dimensional development view. .
When manufacturing the foldable structure 10A including the connection parts 24A, as shown in FIG. 16, if the connection parts 24A are folded from the state of the two-dimensional developed view at the fold line AML3 and fixed by bonding or the like. Good. In FIG. 16, the connecting part 24A is located outside the internal space AV1, but may be located inside the internal space AV1, for example.

According to the foldable structure 10A including the connection parts 24A, the two adjacent second flat plate parts 30A and 30A can be rotated with respect to each other along the inclined side 32A simply by fixing the connection parts 24A in a folded state by bonding or the like. Can be connected as possible. Therefore, the folding structure 10A can be easily manufactured.
Further, according to the folding structure 10A provided with the connecting parts 24A, since the parts of the two second flat plate parts 30A and 30A adjacent in the unfolded state can be reinforced by the connecting parts 24A, the structural strengthening of the folding structure 10A can be enhanced. Can be planned. Therefore, the folding structure 10A can be effectively used as a helmet or container that requires strength.

  Moreover, in the folding structure 10B of 2nd embodiment, the number of the division | segmentation flat plate parts which comprise the single 2nd flat plate part 30B may be three or more, for example. In this case, the other divided flat plate parts other than the divided flat plate part located farthest from the first flat plate part 20B may be formed in an isosceles trapezoidal shape in plan view. The divided flat plate part that is located farthest from the first flat plate part 20B may be formed in either an isosceles triangle in plan view or an isosceles trapezoid in plan view. Further, the angle formed between the base (or long base) and the oblique side in each divided flat plate part only needs to be set smaller as the divided flat plate part is located farther from the first flat plate part 20B.

  The folding structure 10B of the second embodiment may be configured by, for example, a rigid member. In this case, between the first flat plate part 20B and the second flat plate part 30B and between the two divided flat plate parts 35B and 36B adjacent in the longitudinal direction of the second fold line BVL2, the same as in the first embodiment. A gap 40A (see FIGS. 1 to 3) may be formed.

  In the folded structures 10A and 10B according to the above-described two embodiments in the expanded state, the plurality of first flat plate parts 20A and 20B are not necessarily positive in a cross section parallel to the parallel sides 21A and 21B (a cross section perpendicular to the axis L1). It does not have to be a polygon, and all vertices need only be arranged on the same circumference at regular intervals.

Further, in the folding structures 10A and 10B of the two embodiments, the boundary lines (for example, the inclined side 32A in FIG. 4 and the inclined side 32B in FIG. 10) adjacent to each other in the circumferential direction are not necessarily related to the axes L1 and L2. It does not have to be a polygon, for example, a convex shape made of a curve or a line segment. However, an angle at which a plurality of boundary lines gather at points on the axis lines L1 and L2 (vertices TP1 and TP2 in FIG. 4) is 360 ° or less.
In such a configuration, the folded structures 10A and 10B in the unfolded state can be suitably suppressed or prevented from being deformed even when receiving an impact from the axial direction.

  Moreover, in the folding structure 10A of the first embodiment, the inner surface (other surface) facing the inner space AV1 side of the first flat plate part 20A and the second flat plate part 30A has a buffer as shown in FIG. The part 51A may be provided. The buffer 51A may include a buffer material such as rubber. Further, for example, as shown in FIG. 17, the buffer portion 51 </ b> A may include a spring member 54 </ b> A that can elastically expand and contract in the radial direction of the folded structure 10 </ b> A in the unfolded state.

  The spring member 54A may be arbitrary, such as a coil spring, for example, a cylindrical folding structure that forms a non-linear spring part described in Japanese Patent Application Laid-Open No. 2015-081655, or a cylindrical folding structure described in Japanese Patent No. 4253145. "Jin-ichi Itoh, Chie Nara", "Continuous Flattening of Platonic Polyhedra", CGGA 2010, LNCS 7033 , Pp.108-121, 2011 ”may be used. Moreover, when employ | adopting the cylindrical folding structure as described in Unexamined-Japanese-Patent No. 2015-081655 as a spring member 54A, it is good in it being a reverse spiral structure, for example. The folding structure forming the spring member 54A may be made of at least a flexible material that can be bent, and may be, for example, paper or sheet-like plastic. When the spring member 54A is a folding structure, the spring member 54A can be folded small.

The buffer 51A described above may be detachably fixed to the inner surface of the first flat plate part 20A or the second flat plate part 30A, for example, with a surface fastener or the like. Further, for example, the buffer 51A may be fixed to the first flat plate element 23A and the second flat plate element 34A so as not to be detachable so as not to disturb the folding of the first flat plate part 20A and the second flat plate part 30A. Good.
The buffer 51A may be provided so as to straddle the two first flat plate parts 20A and 20A adjacent in the circumferential direction, for example, but is provided only on the inner surface of one first flat plate part 20A as shown in FIG. May be. In this case, the buffer portion 51A can be stably fixed to the first flat plate part 20A. In the configuration illustrated in FIG. 17, the thickness direction of one first flat plate part 20 </ b> A provided with the buffer portion 51 </ b> A and the expansion / contraction direction of the buffer portion 51 </ b> A are the directions in which the folding structure 10 </ b> A opens (downward in FIG. 17). ).

  When the buffer 51A is detachable from the first flat plate part 20A and the second flat plate part 30A, the buffer 51A is close to the first flat plate part 20A and the second flat plate part 30A, for example, by a string or the like. You may connect so that it may space apart. Specifically, one end of the string is fixed to the buffer part 51A, and the other end side of the string is inserted into the first flat plate part 20A or the second flat plate part 30A, so that the buffer part 51A becomes the first flat plate part 20A or the second flat plate part 20A. It may be connected to the two flat plate parts 30A.

  When the buffer portion 51A is provided on the inner surface of the first flat plate part 20A or the second flat plate part 30A, an impact load is applied to the outer surface (one surface) of the first flat plate part 20A or the second flat plate part 30A from the outside of the internal space AV1. Even if it acts, it is possible to suppress or prevent an impact load from acting on an object such as a head housed in the internal space AV1 by elastically deforming the buffer 51A. That is, it is possible to protect the items stored in the internal space AV1.

Moreover, as shown in FIGS. 17 and 18, for example, as shown in FIGS. 17 and 18, a pressure dispersion portion 52 </ b> A may be provided at the tip of the buffer portion 51 </ b> A protruding from the inner surface of the first flat plate part 20 </ b> A or the second flat plate part 30 </ b> A. As viewed from the thickness direction of the first flat plate part 20A and the second flat plate part 30A, the area of the pressure dispersion part 52A in plan view is larger than the area of the buffer part 51A in plan view (see particularly FIG. 18).
The pressure dispersion portion 52A may have a structure that does not deform even when an external force is applied from at least the thickness direction. Although the specific structure of the pressure dispersion part 52A may be arbitrary, the pressure dispersion part 52A illustrated in FIGS. 17 and 18 is a honeycomb structure in which hexagonal cylindrical parts 53A extending in the thickness direction are arranged without gaps. It is a structure.

The above-described pressure dispersion portion 52A may be detachably fixed to the buffer portion 51A by, for example, a hook-and-loop fastener or the like, or may be fixed to be non-detachable, for example. When a plurality of buffer parts 51A are provided, the pressure dispersion part 52A may be provided individually for the plurality of buffer parts 51A, or only one may be provided for the plurality of buffer parts 51A. .
When the pressure dispersion part 52A is detachable with respect to the first flat plate part 20A and the second flat plate part 30A, the pressure dispersion part 52A may be connected so as to approach and separate from the buffer part 51A by, for example, a string or the like. Good.

  When the pressure dispersion portion 52A is provided at the tip of the buffer portion 51A, a part of the impact load that acts on the outer surface of the first flat plate part 20A and the second flat plate part 30A from the outside of the internal space AV1 is absorbed by the buffer portion 51A and Even if it is transmitted to the stored object such as the head stored in the internal space AV1 via the pressure dispersion portion 52A, the pressure acting on the stored object can be reduced. That is, it is possible to more suitably protect the stored items stored in the internal space AV1.

  The buffer part 51A and the pressure dispersion part 52A described above may be applied to the folding structure 10B of the second embodiment, for example.

10A, 10B Folding structures 20A, 20B First flat plate parts 21A, 21B Parallel sides 22A, 22B Extended sides 23A, 23B First flat plate elements 30A, 30B Second flat plate parts 32A, 32B Inclined sides 33A Top sides 34A, 34B First Two flat plate element 35B First divided flat plate part 36B Second divided flat plate part 51A Buffer part 52A Pressure distribution part AVL1, BVL1 First folding line AVL2, BVL2 Second folding line

Claims (6)

A pair of parallel sides parallel to each other and a pair of extending sides extending from both ends of one of the parallel sides to both ends of the other parallel side, and an angle formed by the parallel side and the pair of extending sides A plurality of first flat plate parts that are formed in a rectangular shape in plan view that is equal to each other, and are connected to each other so as to be rotatable around the extending side;
It is formed into a polygon in plan view having a pair of inclined sides that extend so as to approach each other as the distance from the first flat plate part starts from both ends of the parallel side. A plurality of second flat plate parts that are pivotally connected to each other,
The second flat plate parts adjacent to each other in the arrangement direction of the plurality of first flat plate parts are connected to each other so as to be rotatable around the inclined side as an axis,
The first flat plate part is composed of a pair of first flat plate elements that are rotatably connected to each other around a first fold line passing through the middle of the pair of parallel sides,
A folding structure comprising a pair of second flat plate elements, wherein the second flat plate parts are pivotally connected to each other about a second fold line extending from an end of the first fold line. Between the first flat plate part and the second flat plate part,
A first line connecting both ends of the parallel side, and a point located on the first fold line or the second fold line on the first flat plate part side or the second flat plate part side with respect to the parallel side; The folding structure according to claim 1, wherein a gap including at least a triangular region surrounded by a pair of second line segments connecting both ends of the parallel sides is formed.   The folding structure according to claim 2, wherein the gap is filled with a flexible covering portion. The second flat plate part includes a plurality of divided flat plate parts arranged in a direction in which the second fold line extends and connected to each other so as to be rotatable.
The angle formed between the parallel side and the inclined side in one divided flat plate part is different from the parallel side and the inclined side in another divided flat plate part located closer to the first flat plate part than the one divided flat plate part. The folding structure according to any one of claims 1 to 3, wherein the folding structure is smaller than an angle formed by. The second flat plate part is formed in a polygonal shape in plan view having a top side that connects the ends in the extending direction of the pair of inclined sides,
The folding structure according to any one of claims 1 to 4, wherein the top side is parallel to the parallel side. The pair of first flat plate elements and the pair of second flat plate elements are opened to each other along the first fold line and the second fold line, respectively, and the first flat plate part and the second flat plate part are not folded. In a flat state, it becomes a structure with a space inside,
The folding structure according to any one of claims 1 to 5, wherein a buffer portion is provided on a surface facing the space side of at least one of the first flat plate part and the second flat plate part. object.

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