JP3226784U - Thin plate structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin plate structure which ensures strength of an assembled thin plate structure and is easy to deploy and reassemble. SOLUTION: A thin plate 10 of a thin plate structure 1 is composed of a core formed in a flat plate shape and liners attached to both surfaces of the core. In the thin plate, valley fold lines 11 and 12 are formed on the first main surface 101, each of which extends from a first side of the thin plate to a second side facing the first side and does not intersect with each other. A quadrangular prism is formed when folded along the valley fold line, and two edge portions 13a and 13b outside the valley fold line 12 are folded inside the quadrangular prism so that the edge portion is the second main surface. 102 contact each other. A slit into which the fastener 20 can be fitted is formed in the edge portion at an overlapping position where the second main surfaces are in contact with each other. The fasteners are fitted in the slits and pinch the edges. [Selection diagram] Fig. 3

Description

The present invention relates to a thin plate structure composed of a thin plate having liners on both sides of a flat plate-shaped core.

For example, a structure such as a play prop or an exhibition panel is often configured by attaching a board to a structure such as wooden columns and beams. After these structures are assembled, they cannot be easily disassembled and reassembled. Also, the columns and beams are solid and cannot be folded or reduced in volume.

By the way, a packing structure, a display stand, and the like are often configured with a bending structure using a thin plate made of paper or resin such as corrugated board or paperboard. For example, Patent Document 1 discloses a thin plate structure in which a self-supporting structure can be assembled and can be compactly stored after use. The thin plate structure of Patent Document 1 is formed from a thin plate made of paper or resin, and an angle formed by bending the first hinge portion arranged in the up-down direction in a self-standing state and the first hinge portion. And a second hinge portion that is substantially orthogonal to the first hinge portion, and is a thin plate structure.

Patent Document 2 describes an exhibition stand that can be carried in in a folded state, can be easily and quickly assembled, and has a function of displaying and displaying products. In the display stand of Patent Document 2, a tubular body in which a first side plate and a second side plate are connected to each other via a fold line, and a ceiling that is fixed to the upper end of the first side plate in a bridge shape and has a fold line formed in the center A first state in which the surface portion and a support housed inside the tubular body are provided, the tubular body is flatly folded together with the support pillar, and the top surface portion is folded in two along the folding line; By restoring the shape of the column by the urging force of the first side plate, the first side plate is pressed from the inside, the tubular body has a hexagonal cross-section, and the top surface portion can be deformed into a second state in which the top surface is flatly developed.

JP, 2008-87828, A JP, 2005-97726, A

Structures such as play props or display panels cannot be folded or reduced in volume and thus require a large amount of space for storage and transportation. The bending structure using a thin plate made of paper or resin used for a packing material, a display stand, or the like as shown in Patent Document does not have sufficient strength to support a structure such as an exhibition panel.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to secure the strength of an assembled thin plate structure and facilitate the expansion and reassembly of the thin plate structure.

A thin plate structure according to an aspect of the present invention includes a thin plate including a core formed in a flat plate shape and liners attached to both surfaces of the core, and a concave portion that can be sandwiched between two thin plates. A formed fastener. The thin plate has four or more valley fold lines that extend from the first side of the thin plate to the second side facing the first side and do not intersect each other on the first main surface of the thin plate. , The thin plate forms a prism or a truncated pyramid when bent along a valley fold line, and two edges outside the valley fold lines on both outsides of the four or more valley fold lines of the thin plate are prismatic. Alternatively, it is bent inside the truncated pyramid so that the two edges contact each other at the second main surfaces. A slit into which a fastener can be fitted is formed in each of the two edge portions at a position where the thin plate is bent along the valley fold line and the two edge portions are in contact with each other at the second main surfaces. The fastener is fitted into the slit with the two edges in contact with each other at the second major surfaces, and the recess of the fastener sandwiches the two edges.

Preferably, at least one of the slits is formed parallel to a valley fold line that is in contact with the edge from the bottom surface of the prism or the truncated pyramid.

Preferably, the slits formed in parallel with the valley fold line that is in contact with the edge from the bottom surface of the prism or the truncated pyramid are formed at two locations, the upper bottom surface and the lower lower surface of the prism or the truncated pyramid.

Preferably, at least one of the slits is formed in the middle of the first side and the second side of the two edges, in parallel to the valley fold line in contact with the edges.

Preferably, in a state where the thin plate is bent along a valley fold line to form a prism or a truncated pyramid, a side surface facing a slit formed between the first side and the second side of the two edges. A window that can be opened and closed through which the fastener can pass is formed.

Preferably, the thin plate is formed with a first linear cut that extends from the first main surface to the center and intersects with the valley fold line in the expanded state of the thin plate.

Preferably, further, the thin plate is formed with at least one second notch in a linear shape which reaches the center from the second main surface and intersects with the valley fold line in a state where the thin plate is expanded, The first notch and the second notch are alternately formed in the direction of the valley fold line.

Preferably, the at least one fastener contacts the first major surface of the lamella while fitted in the slit.

Preferably, the edge portion is bent inward from the middle of two adjacent ridges of the prism or the truncated pyramid.

Alternatively, the edge may be folded inward from one edge of a prism or a truncated pyramid.

Preferably, the core is formed in a flat plate shape by repeatedly bending the sheet along ridge lines parallel to each other in a direction intersecting with the main surface of the thin plate.

In the thin plate structure of the present invention, the thin plate is bent along a valley fold line to form a prism or a truncated pyramid, and a fastener is fitted in a slit formed in the two edges of the thin plate to sandwich the two edges. Therefore, the strength of the assembled thin plate structure is secured, and the expansion and reassembly of the thin plate structure are easy.

1 is a developed plan view of a thin plate according to Embodiment 1 of the present invention. FIG. 3 is a plan view of the fastener according to the first embodiment. FIG. 3 is a developed sectional view of the thin plate according to the first embodiment. FIG. 3 is a top view of the thin plate structure according to the first embodiment in an assembled state. FIG. 9 is a partial cross-sectional view of a thin plate structure according to Modification 1. FIG. 9 is a top view of a thin plate structure according to Modification 2. FIG. 11 is a top view of a thin plate structure according to Modification 3. FIG. 11 is a top view of a thin plate structure according to Modification 4. FIG. 11 is a top view of a thin plate structure according to Modification 5. FIG. 13 is a developed plan view of a thin plate according to Modification 6; It is a development top view of the thin plate which concerns on Embodiment 2 of this invention. 1 is a partial cutaway view schematically showing the structure of a thin plate according to an embodiment of the present invention. It is a fragmentary sectional view showing the structure of a different thin plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are designated by the same reference numerals.

Embodiment 1.
FIG. 1A is a developed plan view of a thin plate according to Embodiment 1 of the present invention. The thin plate 10 includes a flat core-shaped core and liners attached to both surfaces of the core. The thin plate 10 is, for example, known as Re-board (registered trademark), and is attached to both sides of a core and a core formed into a flat plate by repeatedly bending a sheet at a ridge line in a direction intersecting with a liner. It is composed of liners. Alternatively, the thin plate 10 is made of, for example, cardboard.

FIG. 1B is a plan view of the fastener according to the first embodiment. The fastener 20 is the same material as the thin plate 10 or a flat plate made of paper or resin. The thin plate structure according to the first embodiment includes a thin plate 10 and one or more fasteners 20.

In the thin plate 10 shown in FIG. 1A, six valley fold lines 11 and 12 are formed on the first main surface which is the front side of the drawing. The valley fold lines 11 and 12 are formed in a straight line extending from the upper side which is the first side of the thin plate 10 to the lower side which is the second side facing the first side. The valley fold lines 11 and 12 are parallel to each other and do not intersect. The outer sides of the valley fold lines 12 on both outer sides of the valley fold lines 11 and 12 are two edge portions 13a and 13b. Slits 4a and 4b extending from the upper side parallel to the valley fold line 12 are formed in the edge portions 13a and 13b, respectively, and slits 5a and 5b extending from the lower side parallel to the valley fold line 12 are formed. Further, slits 6a and 6b parallel to the valley fold line 12 are formed in the edges 13a and 13b, respectively, between the upper side and the lower side.

The thin plate 10 is formed with three cutting lines 15 that form the three sides of the quadrangle and a notch 16 that is the remaining one side of the quadrangle. Further, a linear cut 17 intersecting with the valley fold lines 11 and 12 is formed near the center of the thin plate 10. The cutting line 15 penetrates from the first main surface of the thin plate 10 to the second main surface on the back side of the drawing. Both the cut 16 and the cut 17 extend from the liner of the first main surface to the core. The cuts 16 and 17 do not extend to the liner on the second main surface side.

Each of the cutting line 15 and the notches 16 and 17 is obtained by cutting the liner and the core in a direction intersecting the main surface of the thin plate 10 with an extremely thin blade. When both sides of the cutting line 15 and the notches 16 and 17 are made into one plane, the side surfaces of the cutting line 15 and the notches 16 and 17 are brought into contact with each other to support the compressive force intersecting the cutting lines 15 and the notches 16 and 17. it can.

A rectangular portion surrounded by the cutting line 15 and the notch 16 can be bent at the notch 16 and open to the side of the second main surface to form the window 14. Since the window 14 is connected to the thin plate 10 by the liner on the second main surface side of the notch 16, it can be opened or closed. The window 14 allows the fasteners 20 to pass through in the open state. A hole for hanging a finger is formed in the lower left corner of the window 14. Since the cut 17 is formed in a straight line continuously from the left side to the right side parallel to the valley fold lines 11 and 12, the thin plate 10 can be folded at the cut 17 into a mountain fold and folded.

The fastener 20 shown in FIG. 1B has the same thickness as the width of the slits 4a, 4b, 5a, 5b, 6a, 6b, and can be fitted in the slit in the thickness direction. The fastener 20 is formed with a recess 21 penetrating in the thickness direction from one side toward the center. The width of the recess 21 is the same as the thickness of the two edges 13a and 13b overlapped, and the two edges 13a and 13b in the overlapped state can be sandwiched by the recess 21.

FIG. 2 is a developed sectional view of the thin plate according to the first embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. 1A. The valley fold lines 11 and 12 are grooves formed on the first main surface 101 and having a V-shaped cross section. The V-shaped apex angle is 90° in all cases. The thin plate 10 can be bent at right angles along the valley fold lines 11 and 12. When bent along the valley fold lines 11 and 12, the side surfaces of the V-shaped groove are brought into contact with each other, and the stress that tends to bend at the valley fold lines 11 and 12 at an acute angle can be countered.

FIG. 3 is a top view of the thin plate structure according to the first embodiment in an assembled state. When the thin plate 10 is folded along the valley fold lines 11 and 12, the thin fold plate 12 forms a quadrangular prism in which the valley fold lines 12 are butted against each other on the second main surface 102 side. The two edge portions 13a and 13b are bent to the inside of the quadrangular prism from the position where the valley fold lines 12 are butted against each other on the second main surface side, and the edge portions 13a and 13b are connected to each other on the second main surface. Contact with. The slits 4a and 4b, the slits 5a and 5b, and the slits 6a and 6b are respectively formed at overlapping positions where the edge portions 13a and 13b are in contact with each other on the second principal surface 102. The window 14 is formed on the side surface of a quadrangular prism facing the slit 6a.

With the edge portion 13a and the edge portion 13b in contact with each other at the second principal surfaces, the fasteners 20 are fitted into the slits 4a and 4b, the slits 5a and 5b, and the slits 6a and 6b, respectively. It is possible to hold the edge portion 13a and the edge portion 13b by sandwiching them in the recess 21. The window 14 is opened in the slits 6a and 6b, the fastener 20 is inserted from the side surface of the quadrangular prism, the fastener 20 is slid in the direction of the slits 6a and 6b, and the concave portion 21 forms the edge portion 13a and the edge portion 13b. Can be sandwiched.

To assemble the thin plate structure 1, as shown in FIG. 3, the thin plate 10 is bent along the valley fold lines 11 and 12 to form a quadrangular prism. Then, the fasteners 20 are fitted into the slits 4a and 4b, the slits 5a and 5b, and the slits 6a and 6b, respectively, and the edge portion 13a and the edge portion 13b are sandwiched and locked by the recessed portion 21, and the thin plate structure is formed. 1 can be assembled. The fastener 20 is removed from the slits 4a and 4b, the slits 5a and 5b, and the slits 6a and 6b in the reverse order from the state in which the thin plate structure 1 is assembled, and the thin plate 10 is developed on a flat surface and folded at the notch 17. be able to.

In the assembled state, the thin plate structure 1 forms a prism having a closed columnar side surface, and therefore is resistant to compression, tension, and bending, and respective stresses. Also, the side faces of the V-shaped grooves of the valley fold lines 11 and 12 are brought into contact with each other to withstand deformation in the cross section. When the thin plate structure 1 is unfolded and folded, it becomes a flat plate shape and can be stacked or placed side by side in the thickness direction. The lamella structure 1 can be assembled by folding the lamella 10 and inserting and fitting the fasteners 20 and can be unfolded in the reverse order. As described above, according to the thin plate structure 1 of the first embodiment, the strength of the assembled structure is secured, and the expansion and reassembly are easy.

In the first embodiment, the cross section is a rectangular prism having a rectangular shape, but the cross section is not limited to a rectangular shape, and may be a square, a rhombus, a parallelogram, a trapezoid, or a trapezium. When the cross section is rectangular or square, the apex angle of the V-shaped groove in the cross section of the valley fold lines 11 and 12 is 90°. In other quadrangles, the apex angle of the V-shaped groove differs depending on the valley fold line.

The thin plate structure 1 according to the first embodiment is not limited to the configurations shown in FIGS. 1 to 3. The slits 6a and 6b, the window 14, and the notch 17 may not be provided. Further, the slits 6a and 6b, the window 14, and the notch 17 may be provided at a plurality of positions, respectively. For example, depending on the length of the square pole, the intermediate slits 6a and 6b and the window 14 may not be provided. If the width of the side surface on the side where the valley fold line 12 is abutted on the second main surface is larger than twice the width of the fastener 20, the thin plate 10 is in the state of a square pole and the fastener 20 is slit 6a, 6b. The window 14 may be omitted as it can be inserted into the.

Only one pair of slits 4a and 4b, slits 5a and 5b, and slits 6a and 6b may be formed. In addition, if it is not necessary to fold the thin plate 10 in the unfolded state, the notch 17 may not be formed. The slits 6a and 6b are not limited to one location, and may be formed in a plurality of locations between the upper side and the lower side.

Modification 1.
FIG. 4 is a partial cross-sectional view of a thin plate structure according to Modification 1. FIG. 4 corresponds to a cross-sectional view as seen from the side of the edge portion 13b in a direction orthogonal to the central axis of the square pole in FIG. 3 and parallel to the fastener 20. In the first modification, the slits 4a and 4b are formed in a direction intersecting with the valley fold line 12 from the end sides of the edge portions 13a and 13b parallel to the valley fold line 12. The fastener 20 is inserted into the slits 4a and 4b in a direction intersecting with the central axis of the square pole. In FIG. 4, the fastener 20 is parallel to the bottom surface of the square pole, but the slits 4a, 4b and the fastener 20 may be inclined with respect to the bottom surface.

It is not limited to the slits 4a and 4b that are formed so as to intersect with the valley fold line 12, and the slits 5a and 5b or the slits 6a and 6b may be formed so as to intersect with the valley fold line 12. The slits 4a and 4b, the slits 5a and 5b, and the slits 6a and 6b that are formed in parallel with the valley fold line 12 may be combined with those that are formed in the direction intersecting with the valley fold line 12.

When the slits are formed parallel to the valley fold line 12 as shown in FIG. 1, the side surfaces of the recess 21 are parallel to the valley fold line 12, so that the valley fold lines 12 spread out at the edges 13a and 13b. The effect of holding down is great. Depending on the relationship between the thin plate structure 1 and other members, the slits may be formed so as to intersect with the valley fold lines 12 so that they can be easily assembled and disassembled.

Modification 2.
FIG. 5 is a top view of a thin plate structure according to Modification 2. In the second modification, the side surface of the fastener 20 is in contact with the first main surface 101 of the thin plate 10. In the second modification, since the side surface of the fastener 20 contacts the inner surface of the prism, the effect of suppressing the deformation in the cross section orthogonal to the central axis of the prism is large. It should be noted that also in Modification 1, the side surface of the fastener 20 may be brought into contact with the first main surface 101 of the thin plate 10 as in Modification 2. In Modification 1, since the fastener 20 is parallel to the cross section of the prism, when the side surface of the fastener 20 is brought into contact with the first main surface 101 of the thin plate 10, the deformation in the cross section orthogonal to the central axis of the prism is suppressed. The effect of doing is even greater.

Modification 3.
FIG. 6 is a top view of a thin plate structure according to Modification 3. Modification 3 is a case where the thin plate structure 1 is a triangular prism. The thin plate structure 1 is not limited to a quadrangular prism, and may be a triangular prism or a prism having a polygonal cross section of pentagon or more. In Modification 3, the two edge portions 13a and 13b are bent inward from the middle of two adjacent ridges of the prism as in FIG. Therefore, the apex angle of the cross section of the V-shaped groove of the valley fold line 12 is 90°.

When the internal angle of the cross section of the prism formed by the thin plate structure 1 is acute, the apex angle of the cross section of the V-shaped groove of the valley fold line 11 is larger than 90°. When the internal angle of the cross section of the prism is larger than 90°, the apex angle of the cross section of the V-shaped groove of the valley fold line 11 is smaller than 90°. When the thin plate structure 1 is a regular triangular prism, the vertical angle of the V-shaped cross section of the valley fold line 11 is 120°.

Modification 4.
FIG. 7 is a top view of a thin plate structure according to Modification 4. In the modified example 4, the thin plate structure 1 is a triangular prism, and the two edge portions 13a and 13b are bent inward from one edge of the triangular prism. Therefore, the vertical angle of the cross section of the V-shaped groove of the valley fold line 12 is larger than 90°. When the thin plate structure 1 is a regular triangular prism, the apex angle of the V-shaped groove section of the valley fold line 12 is 150°. In Modification 4, the number of valley fold lines 11 is two, which is the minimum number of valley fold lines 11. That is, the total number of valley fold lines 11 and 12 is four or more.

As shown in FIGS. 3, 5 and 6, when the two edge portions 13 a and 13 b are bent inward from the middle of two adjacent ridges of the prism, the valley fold lines 12 are arranged on the second major surface 102. The lines formed by butting on the sides are located in the middle of the side faces. On the other hand, in the modified example 4, the line formed by the valley fold lines 12 abutting each other on the second main surface 102 side coincides with one ridge of the prism, so that the side face of the prism has a butt line. No, the butted lines are inconspicuous.

Modification 5.
FIG. 8 is a top view of a thin plate structure according to Modification 5. In the modified example 5, the thin plate structure 1 is a quadrangular prism, and the two edges 13a and 13b are bent inward from one edge of the quadrangular prism. The structure in which the two edge portions 13a and 13b are bent inward from one edge of the prism may be used, or the thin plate structure 1 may be any polygon having a triangular cross section or more. When the cross section of the thin plate structure 1 is a convex polygon, the apex angle of the cross section of the V-shaped groove of the valley fold line 12 is larger than 90°. When the thin plate structure 1 has a square or rectangular cross section, the vertical angle of the V-shaped groove cross section of the valley fold line 12 is 135°.

Modification 6.
FIG. 9 is a developed plan view of a thin plate according to Modification 6. The thin plate 10 of the modified example 6 has a structure in which two linear cuts 18 intersecting with the valley fold lines 11 and 12 are added to the thin plate 10 shown in FIG. Both of the two cuts 18 extend from the liner of the second main surface 102 to the core. The cut 18 does not extend to the liner on the first major surface 101 side. One notch 18 is formed in the middle of the upper side of the thin plate 10 and the notch 17, and one in the middle of the notch 17 and the lower side of the thin plate 10.

The cut 17 can be folded in a mountain fold in FIG. 9, whereas the cut 18 can be folded in a valley fold in FIG. The developed thin plate 10 can be folded like a folding screen with the notches 17 and the two notches 18. In the example of FIG. 9, it is folded into the shape of a folding screen with four curves.

The combination of the cut 17 and the cut 18 is not limited to the example of FIG. 9. The notch 18 may be formed in the center, and the notch 17 may be formed between the notch 18 and the upper side and between the notch 18 and the lower side, respectively. For folding into three or more pieces, each of the notches 17 and 18 is one or more. The cuts 17 and the cuts 18 are formed alternately in the direction of the valley fold lines 11 and 12. In Modifications 1 to 5 as well, as in Modification 6, the notches 17 and 18 may be formed.

In Modifications 2 to 6 as well, as in Modification 1, the slits 4a, 4b, the slits 5a, 5b, and the slits 6a, 6b are formed so as to intersect with those formed in parallel to the valley fold line 12. You may combine what is formed. In modification 1 and modification 3 to modification 6, the side surface of the fastener 20 may be brought into contact with the first main surface 101 of the thin plate 10 as in modification 2. Further, the slit may be formed in a direction orthogonal to the valley fold line 12, and the side surface of the fastener 20 may be brought into contact with the first main surface 101 of the thin plate 10 as in Modification 2.

Embodiment 2.
FIG. 10 is a developed plan view of a thin plate according to the second embodiment of the present invention. In the second embodiment, the shape formed by bending the thin plate 10 of the thin plate structure 1 along the valley fold lines 11 and 12 is a truncated pyramid. The second embodiment is the same as the first embodiment except that the prism is a truncated pyramid.

In the second embodiment, the portion sandwiched by the valley fold lines 11 of the thin plate 10 is trapezoidal. In order to make the bottom surface of the truncated pyramid formed by the thin plates 10 flat, the edges of the thin plate 10 forming the bottom surface become polygonal lines when unfolded, but here also the polygonal lines are referred to as the upper side and the lower side.

Also in the second embodiment, Re-board (registered trademark) or cardboard can be used for the thin plate 10, for example. In the thin plate 10 shown in FIG. 10, a total of six valley fold lines 11 and 12 are formed on the first main surface 101 on the front side of the drawing. The valley fold lines 11 and 12 extend from the upper side which is the first side of the thin plate 10 to the lower side which is the second side facing the first side. The valley fold lines 11 and 12 do not intersect with each other. The outer sides of the valley fold lines 12 on both outer sides of the valley fold lines 11 and 12 are two edge portions 13a and 13b. Slits 4a and 4b extending from the upper side parallel to the valley fold line 12 are formed in the edge portions 13a and 13b, respectively, and slits 5a and 5b extending from the lower side parallel to the valley fold line 12 are formed. In the example of FIG. 10, the slits 6a and 6b in the middle between the upper side and the lower side are not formed, but the slits 6a and 6b parallel to the valley fold line 12 may be formed in the edge portions 13a and 13b.

The thin plate 10 is formed with a notch 17 that intersects the valley fold lines 11 and 12 near the center. The cut 17 extends from the liner of the first main surface 101 to the center. The cut 17 does not extend to the liner on the second main surface 102 side. Also in the second embodiment, the slits 6a and 6b, the window 14, and the notch 17 may be provided at one or a plurality of positions, respectively.

Also in the second embodiment, the fastener 20 shown in FIG. 1B can be used. The thin plate 10 shown in FIG. 10 is bent along the valley fold lines 11 and 12, the two edge portions 13a and 13b are aligned with each other on the second main surface 102, and the fasteners 20 are respectively attached to the slits 4a and 4b and the slits 5a and 5b. And the edge portions 13a and 13b are sandwiched between the recesses 21 of the fastener 20, the thin pyramid-shaped thin plate structure 1 can be assembled.

Also in the second embodiment, the shape of the cross section orthogonal to the central axis of the truncated pyramid may be a triangle or a polygon having five or more sides. In the second embodiment, even if the shape of the cross section orthogonal to the central axis of the quadrangular pyramid is square or rectangular, if the ridge of the quadrangular pyramid is not orthogonal to the bottom surface, the V-shaped groove of the valley fold line 11 is formed. The vertical angle of the cross section does not become 90°. Also in the second embodiment, the configurations of the first modification to the sixth modification of the first embodiment can be adopted.

In the second embodiment, the shape formed by bending the valley fold lines 11 and 12 of the thin plate 10 is a quadrangular pyramid, but it is also possible to extend the ridges of the quadrangular pyramid to the points where they intersect with each other to form a quadrangular pyramid. In the case of a quadrangular pyramid, it can be considered that the upper side of the thin plate 10 is a point. In the case of a quadrangular pyramid, the edges 13a and 13b are triangular rather than rectangular or parallelogram.

In the second embodiment shown in FIG. 10, a normal quadrangular pyramid in which a perpendicular line that descends from the intersection of the ridges of the quadrangular truncated pyramid to the bottom intersects the bottom at the center. The bottom surface of the truncated pyramid need not be orthogonal to the central axis passing through the intersection of the ridge and the center of the bottom surface.

Also in the thin plate structure 1 according to the second embodiment, the strength of the assembled structure is secured, and the expansion and reassembly are easy.

FIG. 11 is a partial cutaway view schematically showing the structure of the thin plate according to the embodiment of the present invention. FIG. 11 schematically shows Re-board (registered trademark). The thin plate 10 shown in FIG. 11 includes a core 103 formed into a flat plate shape by repeatedly bending a paper sheet along ridge lines that intersect with the liner 104, and liners 104 attached to both surfaces of the core 103. It is configured. In the actual Re-board (registered trademark), the core 103 is compressed in the direction of the surface of the liner 104.

In the thin plate 10 shown in FIG. 11, the strength anisotropy is small, and even if the V-shaped grooves of the valley fold lines 11 and 12 are formed in any direction, when the V-shaped grooves are bent at the valley fold lines 11 and 12, The change in strength with which the side surfaces come into contact with each other is small, and the strength of the assembled thin plate structure 1 is not significantly affected. Therefore, in the structure of FIG. 11, the strength anisotropy is small even if the thin plate structure 1 is a truncated pyramid.

In FIG. 11, in order to facilitate understanding, the direction of the curved ridgeline of the sheet in the core 103 is constant, but the structure may be such that the direction of the curved ridgeline changes periodically. Even in the case of the core 103 in which the direction of the curved ridgelines of the sheet changes periodically, parallel ridgelines appear periodically, so that the sheet is repeatedly bent at parallel ridgelines to form a flat plate structure. It can be said that

FIG. 12 is a partial cross-sectional view showing the structure of different thin plates. The thin plate 10 shown in FIG. 12 has a structure in which two corrugated cardboards 105 and 106 are bonded to each other such that the directions of the ridgelines of the respective cores 107 and 108 are orthogonal to each other. In FIG. 12, in the corrugated board 105 on the first major surface 101 side, the ridgeline of the center core 107 is in the left-right direction in the drawing. The corrugated board 106 on the second main surface 102 side is a direction in which the ridgeline of the core 108 is orthogonal to the paper surface.

FIG. 12 shows a structure in which the corrugated board 105 on the side of the first main surface 101 is provided with valley fold lines 11 and 12 parallel to the ridgeline of the core 108 of the corrugated board 106. The thin plate 10 in which the valley fold lines 11 and 12 are formed in the direction shown in FIG. 12 is bent along the valley fold lines 11 and 12 to generate a force in the central axis direction of the prism, mainly on the second main surface 102 side. Corrugated board 106 supports. Then, the corrugated board 105 on the side of the first main surface 101 mainly opposes the deformation in the cross section. According to the thin plate 10 of FIG. 12, it is possible to configure the thin plate structure 1 that ensures strength even with corrugated board and is easy to deploy and reassemble.

In the structure in which two corrugated boards 105 and 106 are bonded together, the valley fold lines 11 and 12 formed are not limited to the shapes shown in FIG. For example, the V-shaped groove may be formed only on the corrugated board 105, and the corrugated board 106 may be stamped along the V-shaped groove with a scoring tool to form the valley fold lines 11 and 12.

The thin plate 10 of the embodiment is not limited to paper, and may be made of resin or a laminated material in which a metal foil is attached to a paper or resin sheet. Alternatively, a material obtained by coating the liner of the thin paper plate 10 with a resin such as polyethylene may be used. The thin plate structure 1 constituted by the thin plate 10 made of resin or coated with resin can be used in a place where water drops may be applied.

Further, the center of the thin plate 10 is not limited to the bent sheet. The thin plate 10 may be composed of, for example, a core formed by pressing a wood or resin chip into a flat plate shape and a paper or resin liner attached to both surfaces of the core.

1 thin plate structure 10 thin plate 11 valley fold line (middle)
12 valley fold lines (both outside)
13a, 13b Edge 14 Window 15 Cutting line 16 Notch 17 Notch 18 Notch 20 Fastener 21 Recess 4a, 4b, 5a, 5b, 6a, 6b Slit 101 First main surface 102 Second main surface 103 Core 104 Liner 105,106 Corrugated board 107,108 Core

Claims (11)

A core formed in a flat plate shape, and a thin plate composed of liners attached to both surfaces of the core,
A fastener having a recessed portion that can be sandwiched in a state where the two thin plates are stacked,
The thin plate has four or more valley folds, each of which extends from the first side of the thin plate to the second side facing the first side and does not intersect with each other, on the first main surface of the thin plate. A line is formed,
The thin plate forms a prism or a truncated pyramid when bent along the valley fold line, and two edge portions outside the valley fold lines on both outsides of the four or more valley fold lines of the thin plate. Is bent inside the prism or the truncated pyramid, and the two edges contact each other at the second main surfaces,
A slit into which the fastener can be fitted to the two edge portions at a position where the thin plate is bent along the valley fold line and the two edge portions are in contact with each other at the second main surfaces. Has been formed,
The fastener is fitted into the slit in a state where the two edges are in contact with each other at the second main surfaces, and the recess of the fastener sandwiches the two edges.
Thin plate structure. The thin plate structure according to claim 1, wherein at least one of the slits is formed parallel to the valley fold line that is in contact with the edge from the bottom surface of the prism or the truncated pyramid. The slits formed in parallel to the valley fold line in contact with the edge portion from the bottom surface of the prism or the truncated pyramid are formed at two locations, that is, the upper bottom surface and the lower lower surface of the prism or the truncated pyramid. Item 3. The thin plate structure according to item 2. At least one of the slits is formed in the middle of the first side and the second side of the two edge portions, in parallel with the valley fold line in contact with the edge portions. The thin plate structure according to any one of 3 above. The slit formed in the middle of the first side and the second side of the two edge portions in a state where the thin plate is bent along the valley fold line to form the prism or the truncated pyramid. The thin plate structure according to claim 4, wherein an openable and closable window through which the fastener can pass is formed on a side surface facing the sheet metal. The linear first cut which reaches the center from the first main surface and intersects with the valley fold line in a state where the thin plate is expanded is formed in the thin plate, The thin plate structure according to any one of 1 to 5. In the thin plate, at least one second notch that reaches the center from the second main surface and that intersects with the valley fold line in a state where the thin plate is expanded is formed.
The first notch and the second notch are alternately formed in the direction of the valley fold line,
The thin plate structure according to claim 6. The thin plate structure according to any one of claims 1 to 7, wherein at least one of the fasteners is in contact with the first main surface of the thin plate in a state of being fitted in the slit. The thin plate structure according to claim 1, wherein the edge portion is bent inward from the middle of two adjacent ridges of the prism or the truncated pyramid. The thin plate structure according to claim 1, wherein the edge portion is bent inward from one edge of the prism or the truncated pyramid. The thin plate structure according to any one of claims 1 to 10, wherein the core is formed in a flat plate shape by repeatedly bending a sheet along ridge lines parallel to each other in a direction intersecting with a main surface of the thin plate.

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