bed

Abstract

We offer a bed that is easy to carry. [Solution] The bed of the present invention comprises a base portion configured to be foldable, a plate-shaped floor plate portion placed on the base portion, a longitudinal end engagement portion and a longitudinal end engagement portion connected to the floor plate portion at one end in the longitudinal direction of the floor plate portion and restricting the relative displacement of the floor plate portion to the base portion in the longitudinal direction, and a pair of first widthwise engagement portions and a pair of second widthwise engagement portions connected to the floor plate portion at both ends in the width direction of the floor plate portion and restricting the relative displacement of the base portion to the base portion and the floor plate portion in the width direction, wherein the floor plate portion has a plurality of floor-side fold lines extending in the width direction of the floor plate portion for folding the floor plate portion, and the floor plate portion, the longitudinal end engagement portion, the first widthwise engagement portion, the longitudinal end engagement portion and the second widthwise engagement portion constitute a case portion having a storage space capable of accommodating the base portion in a folded state by folding the floor plate portion to the same side with the plurality of floor-side fold lines.

Description

Technical Field

[0001] The present invention relates to a foldable bed.

Background Art

[0002] In recent years, situations where people have to live in shelters when disasters occur have occurred frequently. In preparation for such situations, beds for use in shelters are desired. As such a bed, a simple bed has been proposed that includes a bellows-shaped body that is stretchable and composed of a plurality of bases connected in a predetermined direction, and a foldable top plate (see, for example, Patent Document 1). When the simple bed is stored or transported, the body is contracted in a predetermined direction, the top plate is folded, and when in use, the body is extended in a predetermined direction, the body is expanded, and the top plate is placed on the body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when carrying the above simple bed, it is difficult to carry it as it is with the body and the top plate. Also, even when the top plate is placed on the body, if an external force in the plane direction is applied to the top plate, the top plate is likely to shift from the body, making it difficult to sleep.

[0005] In view of such circumstances, the present invention aims to provide a bed that is easy to carry.

Means for Solving the Problems

[0006] The bed of the present invention comprises a base portion configured to be foldable, a plate-shaped floor plate portion placed on the base portion, a longitudinal end engagement portion connected to the floor plate portion at one end in the longitudinal direction of the floor plate portion and engaging with the end face of the base portion at one end in the longitudinal direction (hereinafter referred to as the longitudinal end face) to restrict the relative displacement of the floor plate portion toward the other end of the base portion in the longitudinal direction with respect to the base portion, a pair of first widthwise engagement portions connected to the floor plate portion at both ends in the width direction of the floor plate portion and engaging with a region near the longitudinal end face of a pair of widthwise end faces at both ends in the width direction of the base portion (hereinafter referred to as the region near the end face) to restrict the relative displacement of the base portion and the floor plate portion toward the base portion in the width direction, and a portion connected to the floor plate portion at the other end in the longitudinal direction of the floor plate portion and engaging with the end face of the base portion at the other end in the longitudinal direction (hereinafter referred to as the longitudinal other end face) to restrict the relative displacement of the base portion and the floor plate portion The floorboard comprises a longitudinal end engagement portion that restricts relative displacement of the floorboard portion toward one end in the longitudinal direction of the base portion, and a pair of second widthwise engagement portions that are connected to the floorboard portion at both ends in the width direction of the floorboard portion and engage with a region near the longitudinal end face of a pair of widthwise end faces (hereinafter referred to as the region near the other end face) to restrict relative displacement of the base portion and the floorboard portion toward the width direction of the base portion, wherein the floorboard portion extends in the width direction of the floorboard portion and has a plurality of floor-side fold lines for folding the floorboard portion, which are provided at intervals in the longitudinal direction of the floorboard portion, and the floorboard portion, the longitudinal end engagement portion, the first widthwise engagement portion, the longitudinal end engagement portion, and the second widthwise engagement portion constitute a case portion having a storage space capable of accommodating the base portion in a folded state by folding the floorboard portion toward the same side with the plurality of floor-side fold lines.

[0007] The bed of the present invention is characterized in that it is provided with a gripping portion for gripping the case portion, which is provided on the longitudinal engagement portion at one end or the longitudinal engagement portion, and the floor plate portion is folded to the same side along a plurality of floor-side fold lines and has through holes for passing the gripping portion when the floor plate portion overlaps the longitudinal engagement portion at one end or the longitudinal engagement portion.

[0008] In the bed of the present invention, the bed base has four floor-side fold lines, and the bed base is divided into five bed base pieces with the four floor-side fold lines as boundaries, and the bed base pieces are defined as the first bed base piece, the second bed base piece, the third bed base piece, the fourth bed base piece, and the fifth bed base piece in order from one end to the other in the longitudinal direction of the bed base, the case part is an upper part composed of the longitudinally overlapping longitudinally overlapping one-end engaging part and the fourth bed base piece, a bottom part composed of the longitudinally overlapping second bed base piece and the longitudinally overlapping other-end engaging part, a first side wall part connected to the upper part and the bottom part and composed of the longitudinally overlapping first bed base piece and the fifth bed base piece, and the upper part and the The case has a second side wall portion connected to the bottom and facing the first side wall portion, and composed of the third floor plate piece; a third side wall portion located between the first side wall portion and the second side wall portion, and composed of one of the first width-direction engaging portions and one of the second width-direction engaging portions that overlap each other; and a fourth side wall portion located between the first side wall portion and the second side wall portion, facing the third side wall portion, and composed of the remaining first width-direction engaging portion and the remaining second width-direction engaging portion that overlap each other, wherein the first side wall portion, the third side wall portion, the second side wall portion, and the fourth side wall portion are arranged in that order in the circumferential direction of the case portion and surround the storage space.

[0009] The bed of the present invention is provided with a gripping portion for gripping the case portion, which is provided at one end of the longitudinal engagement portion, and the fourth bed plate piece is folded to the same side along a plurality of floor-side fold lines and has a through hole for passing the gripping portion when the bed plate portion overlaps the longitudinal engagement portion.

[0010] In the bed of the present invention, a pair of first width-direction engaging portions has a step along the width direction of the first width-direction engaging portion on the outer plane opposite to the engaging surface that engages with the region near the one end face, and when the first width-direction engaging portion is divided in the width direction of the first width-direction engaging portion with respect to the step as the boundary, into a proximal region near the longitudinal end engaging portion and a distal region distal to the longitudinal end engaging portion, the distal region is recessed by the amount of the step compared to the proximal region, and in the case portion, the second width-direction engaging portion fits into the recessed area of ​​the distal region.

[0011] The bed of the present invention is characterized in that the base portion has a plurality of base pieces arranged in a row along the length of the base portion, and the base pieces are configured to be foldable.

[0012] In the bed of the present invention, the base piece has a grid body formed by connecting a pair of first plate-shaped parts and a pair of second plate-shaped parts in a grid-like pattern, and a cylindrical body that surrounds the grid body and engages with the grid body to hold it. Each of the pair of first plate-shaped parts has a grid-side bend line extending in the height direction of the grid body at the center of the width direction of the first plate-shaped part, and the cylindrical body has a pair of third plate-shaped parts that constitute a part of the cylindrical body and are opposite to the pair of first plate-shaped parts, and a pair of second plate-shaped parts that constitute a part of the cylindrical body The invention features a pair of opposing fourth plate-shaped parts, the pair of third plate-shaped parts having a cylindrical side fold line extending in the height direction of the cylindrical body at the center of the width direction of the third plate-shaped part, and the lattice-side fold line and the pair of cylindrical side fold lines are used to fold the lattice-side body and the cylindrical body so that the pair of lattice-side fold lines and the pair of cylindrical side fold lines approach the center of the cylindrical body, thereby deforming the pair of third plate-shaped parts and the pair of first plate-shaped parts to become convex toward the center of the cylindrical body, and the lattice-side body and the cylindrical body are folded.

[0013] In the bed of the present invention, the cylindrical body has plate-shaped corner plates at each of the four corners of the cylindrical body that are connected to both the third plate-shaped portion and the fourth plate-shaped portion in the circumferential direction of the cylindrical body, and when the cylindrical body is folded, a first direction in which the length of the cylindrical body is shortened while being perpendicular to the axial direction of the cylindrical body and a second direction perpendicular to both the axial direction of the cylindrical body and the first direction are defined, and both ends of the folded cylindrical body in the second direction are made up of the corner plates.

[0014] In the bed of the present invention, when the folded cylindrical body is viewed in plan from the axial direction of the cylindrical body, the internal region of the cylindrical body is characterized in that it is a combined region of two continuous trapezoidal regions, each with the inner circumferential surface of one pair of the four plate-like parts as its lower base and a line passing through both of the pair of cylindrical side fold lines as a virtual common upper base.

[0015] In the bed of the present invention, the base piece is characterized in that it has a plate-shaped fitting plate-like body that is inserted into the hollow portion of the cylindrical portion of the grid body and fits into the cylindrical portion on the inner circumference side of the cylindrical portion.

[0016] In the bed of the present invention, the laminate is constructed by aligning the fourth plate-shaped parts of the cylindrical body so that they overlap, and stacking a plurality of the folded base pieces, and the height and width of the laminate is housed in the storage space of the case such that the height and width of the laminate coincide with the height and width of the storage space of the case, the height and width of the laminate coincide with the height and width of the folded base pieces, and the height and width of the laminate coincide with the height and width of the storage space of the case.

[0017] In the bed of the present invention, the length of the laminate in the stacking direction of the base pieces is smaller than the depth of the storage space in the case portion. [Effects of the Invention]

[0018] According to the bed of the present invention, it is possible to achieve an excellent effect of being easy to carry.

Brief Explanation of Drawings

[0019] [Figure 1] It is a perspective view of the bed in the embodiment of the present invention. [Figure 2] It is a perspective view of the placement part and the base part constituting the bed in the embodiment of the present invention separated from each other. [Figure 3] (A) is a perspective view of the crossbeam body, the cylindrical body, and the plate-like body in the embodiment of the present invention. (B) is a perspective view of the base piece in the embodiment of the present invention. [Figure 4] It is a plan view of the base piece in the embodiment of the present invention. [Figure 5] It is a view of the plate-like body constituting the crossbeam body in the embodiment of the present invention. [Figure 6] (A) to (C) are plan views showing the state of folding the base piece in the embodiment of the present invention arranged in chronological order. [Figure 7] (A) is a development view of the placement part in the embodiment of the present invention. (B) is a perspective view of the placement part in the embodiment of the present invention. [Figure 8] (A) and (B) are side views showing the state of transforming the placement part into the case part in the embodiment of the present invention arranged in chronological order. (C) is a perspective view of the case part in the embodiment of the present invention. (D) is a cross-sectional view of the case part in the embodiment of the present invention cut along the height direction. [Figure 9] (A) and (B) are side views showing the state of transforming a modified example of the placement part into the case part in the embodiment of the present invention arranged in chronological order. (C) and (D) are side views showing the state of transforming another modified example of the placement part different from the above into the case part in the embodiment of the present invention arranged in chronological order. (E) and (F) are side views of another modified example of the case part different from the above in the embodiment of the present invention. [Figure 10](A) is a view before the second width direction engaging portion enters the concave region of the case portion in the embodiment of the present invention. (B) is a view after the second width direction engaging portion enters the concave region of the case portion in the embodiment of the present invention. (C) is a side view showing a state where the second width direction engaging portion enters the concave region together with the fifth floor plate piece of the case portion in the embodiment of the present invention. [Figure 11] It is a perspective view showing the accommodation space of the case portion in the embodiment of the present invention and three base pieces in a folded state stacked on top of each other.

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The accompanying drawings are an example of the mode for carrying out the invention, and in the drawings, parts denoted by the same reference numerals represent the same objects. Also, the shapes and dimensional ratios of each part in each drawing are not necessarily accurate.

[0021] As shown in FIG. 1, the bed 1 in the embodiment of the present invention includes a base portion 2, a floor plate portion 3, a length direction one - end engaging portion 4, a first width direction engaging portion 5, a length direction other - end engaging portion 6, a second width direction engaging portion 7, and a gripping portion 8.

[0022] Here, the combination of the floor plate portion 3, the length direction one - end engaging portion 4, the first width direction engaging portion 5, the length direction other - end engaging portion 6, and the second width direction engaging portion 7 is defined as a placement portion. In this embodiment, the placement portion is composed of a single cardboard, but it is not limited to this, and it may be composed of a plurality of connected cardboard sheets, or may be composed of one or a plurality of plate - like bodies made of other materials.

[0023] Also, as shown in FIG. 2, the placement portion and the base portion 2 are configured to be separable. Also, the placement portion can be deformed into a case portion 10 capable of accommodating the base portion 2.

[0024] <Base portion> The base section 2 forms the base of the bed 1 and is configured to be foldable. In this embodiment, the base section 2 has a plurality of base pieces 20, as shown in Figure 2. The number of base pieces 20 is not limited and may be one. In this embodiment, the case where there are three base pieces 20 will be explained as an example, but the following explanation can be appropriately applied to other numbers as well. For example, the base section 2 may have an overall length in the range of 1900 (mm) to 2100 (mm), an overall width in the range of 700 (mm) to 900 (mm), and a height in the range of 3300 (mm) to 400 (mm).

[0025] The three base pieces 20 are arranged in a row, as shown in Figure 2. The base pieces 20 are configured to be foldable. As shown in Figure 3(A), the base piece 20 has a grid-like body 21, a cylindrical body 24, and a fitting plate-like body 26.

[0026] The grid-like structure 21, the cylindrical structure 24, and the interlocking plate-like structure 26 are made of corrugated cardboard, but are not limited to this, and may be made of plate-like structures made of other materials. From the viewpoint of strength, corrugated cardboard with a thickness of 8 mm or more is preferable. On the other hand, it is preferable that the weight of the bed be as light as possible. For this reason, corrugated cardboard with a thickness of 8 mm is more preferable. As an example of corrugated cardboard with a thickness of 8 mm, double-flute corrugated cardboard can be given, but is not limited to this, and may be corrugated cardboard with other structures.

[0027] <Igeta style> As shown in Figure 3(A), the lattice structure 21 is formed by connecting pairs of first plate-like sections 22 and pairs of second plate-like sections 23 in a lattice-like pattern. In the lattice structure 21, each pair of first plate-like sections 22 is arranged with a gap between them so that their planes face each other. Similarly, each pair of second plate-like sections 23 is arranged with a gap between them so that their planes face each other. The pairs of first plate-like sections 22 and second plate-like sections 23 intersect in a perpendicular orientation. As a result, the lattice structure 21 has a central cylindrical section (hereinafter referred to as the lattice-side cylindrical section) 210 and a plurality of plate-like pieces extending from the circumferential surface of the cylindrical section 210.

[0028] Here, as shown in Figure 4, with the intersection of the first plate-like portion 22 and the second plate-like portion 23 as the boundary, in the first plate-like portion 22, the plate-like piece located in the center of the width direction of the first plate-like portion 22 is defined as the first central plate-like piece 222, and each of the plate-like pieces located on either side of the first central plate-like piece 222 in the width direction of the first plate-like portion 22 is defined as the first end plate-like piece 224. Similarly, with the intersection of the first plate-like portion 22 and the second plate-like portion 23 as the boundary, in the second plate-like portion 23, the plate-like piece located in the center of the width direction of the second plate-like portion 23 is defined as the second central plate-like piece 232, and each of the plate-like pieces located on either side of the second central plate-like piece 232 in the width direction of the second plate-like portion 23 is defined as the second end plate-like piece 234. Furthermore, the opposing directions of a pair of first plate-like sections 22 are defined as the first direction A of the grid-like structure 21, and the opposing directions of a pair of second plate-like sections 23 are defined as the second direction B of the grid-like structure 21 (see Figures 3(A) and 4). The first direction A and the second direction B are orthogonal. Also, the width direction of the first direction A and the second plate-like section 23 are parallel. Also, the width direction of the second direction B and the first plate-like section 22 are parallel. In this specification, the width direction of each component refers to the width direction perpendicular to the height direction of each component, assuming that the direction parallel to the height direction of the bed 1 in the state shown in Figure 1 is the height direction of each component.

[0029] The first central plate-like pieces 222 of one pair of first plate-like sections 22 face each other in the first direction A. The second central plate-like pieces 232 of one pair of second plate-like sections 23 face each other in the second direction B. The grid-side cylindrical section 210 is composed of the first central plate-like pieces 222 of one pair of first plate-like sections 22 and the second central plate-like pieces 232 of one pair of second plate-like sections 23. In this embodiment, the grid-side cylindrical section 210 is formed as a rectangular tube.

[0030] The multiple plate-like pieces consist of a total of two sets of first end plate-like pieces 224 (four first end plate-like pieces 224) facing each other in the first direction A, and a total of two sets of second end plate-like pieces 234 (four second end plate-like pieces 234) facing each other in the second direction B. One set of first end plate-like pieces 224 and one set of second central plate-like pieces 232 are arranged alternately along the circumferential direction of the grid body 21.

[0031] The first plate-like portion 22 has a fold line 220. The fold line 220 may be called the grid-side fold line 220 to distinguish it from other fold lines described later. The fold line 220 extends in the height direction of the first plate-like portion 22 (first central plate-like piece 222) at the center of the width direction of the first plate-like portion 22 (first central plate-like piece 222). The first plate-like portion 22 is bendable along the fold line 220 and can be folded in half.

[0032] The first plate-like section 22 is made of a roughly rectangular first corrugated cardboard having two slits 226 as shown in Figure 5(B). The second plate-like section 23 is made of a roughly rectangular second corrugated cardboard having two slits 236 as shown in Figure 5(A).

[0033] The two slits 226 extend in the height direction of the first corrugated cardboard, starting from the upper end in the height direction of the first corrugated cardboard and reaching the center or vicinity of the center in the height direction of the first corrugated cardboard. The two slits 226 are also provided in parallel at positions symmetrical with respect to the center line (fold line 220) in the width direction of the first corrugated cardboard. The two slits 236 extend in the height direction of the second corrugated cardboard, starting from the lower end in the height direction of the second corrugated cardboard and reaching the center or vicinity of the center in the height direction of the second corrugated cardboard. The two slits 236 are also provided in parallel at positions symmetrical with respect to the center line in the width direction of the second corrugated cardboard.

[0034] The grid-like structure 21 is formed by positioning the first layer of cardboard perpendicular to the second layer of cardboard and inserting the slit 236 of the second layer of cardboard into the slit 226 of the first layer of cardboard.

[0035] <Cylindrical body> As shown in Figure 3(B), the cylindrical body 24 surrounds the grid body 21 and engages with it to hold the grid body 21. As shown in Figure 4, the cylindrical body 24 has a pair of opposing plate-shaped third plate portions 240, a pair of opposing plate-shaped fourth plate portions 242, and four plate-shaped corner portions 244.

[0036] Each pair of third plate-like portions 240 constitutes a part of the cylindrical body and, facing each pair of first plate-like portions 22, engages with the widthwise ends of each pair of second plate-like portions 23, thereby sandwiching the grid-like body 21 in the first direction A. The third plate-like portions 240 also have a fold line 241.

[0037] The folded line 241 may be called the cylindrical folded line 241 to distinguish it from other folded lines. The folded line 241 extends in the height direction of the third plate-like portion 240 at the center of the width direction of the third plate-like portion 240. The third plate-like portion 240 can be folded along the folded line 241 on the side where the folded line 241 approaches the center of the cylindrical body 24 (the side where the third plate-like portion 240 protrudes toward the center of the cylindrical body 24), and can be folded in half. When the base piece 20 is not folded, it is preferable that the folded line 220 and the folded line 241 are parallel and aligned in a line in the first direction A while their positions coincide in the second direction B, but some misalignment is acceptable.

[0038] Each pair of fourth plate-like portions 242 constitutes a part of the cylindrical body, facing each pair of second plate-like portions 23, and engaging with the widthwise ends of each pair of first plate-like portions 22, thereby sandwiching the grid-like body 21 in the second direction B. Each pair of fourth plate-like portions 242 is positioned perpendicular to each pair of third plate-like portions 240.

[0039] As a result, the grid-like structure 21 engages with a pair of third plate-like portions 240 in the first direction A and is held between the pair of third plate-like portions 240, while engaging with a pair of fourth plate-like portions 242 in the second direction B and is held between the pair of fourth plate-like portions 242.

[0040] Each of the four corner plate portions 244 is positioned to correspond to each of the four corners of the cylindrical body 24. The corner plate portions 244 are connected (continuous) between the widthwise end of the third plate portion 240 and the widthwise end of the fourth plate portion 242. As a result, the cylindrical body 24 has a configuration in which the corners of the quadrangular shape are chamfered.

[0041] <Interlocking plate-like body> Referring to Figures 3 and 4, the fitting plate-like body 26 will be described below. The fitting plate-like body 26 is formed in a plate shape. When the fitting plate-like body 26 is inserted into the hollow portion of the lattice-side cylindrical portion 210, it fits into the lattice-side cylindrical portion 210 on its inner circumference.

[0042] In this embodiment, the lattice-side cylindrical portion 210 has four inner circumferential surfaces 211 to 214, as shown in Figure 4. Inner circumferential surfaces 211 and 212 correspond to the inner circumferential surfaces of a pair of first central plate-like pieces 222 and face each other. Inner circumferential surfaces 213 and 214 correspond to the inner circumferential surfaces of a pair of second central plate-like pieces 232 and face each other. The fitting plate-like body 26 is a rectangular plate-like body of the same shape and size as the inner circumferential surface of the lattice-side cylindrical portion 210. When inserted into the hollow portion of the lattice-side cylindrical portion 210, it engages with each of the inner circumferential surfaces 211 to 214 and fits into the lattice-side cylindrical portion 210 on its inner circumferential side.

[0043] When the interlocking plate-like body 26 is attached to the grid-like body 21, the grid-like body 21 and the cylindrical body 24 are restricted from folding as described below. As a result, the interlocking plate-like body 26 can prevent unintended folding of the grid-like body 21 and the cylindrical body 24.

[0044] <How to fold the base piece> Referring to Figure 6, the method for folding the base piece 20 will be described below. To fold the base piece 20, the fitting plate-like body 26 is removed from the grid body 21, and one pair of first plate-like parts 22 are folded in half along the fold line 220, while one pair of third plate-like parts 240 are folded in half along the fold line 241. At this time, as shown in Figure 6(B), one pair of first plate-like parts 22 are folded in half such that their respective fold lines 220 approach each other in the first direction A, or approach the center of the grid body 21 in the first direction A. As a result, each of the pair of first plate-like parts 22 is deformed to become convex towards the center of the cylindrical body 24 and is folded in half.

[0045] Then, the first end plate-shaped piece 224 tilts toward the adjacent second end plate-shaped piece 234, and the second end plate-shaped piece 234 is also guided by the third plate-shaped portion 240 and tilts toward the adjacent first end plate-shaped piece 224. In other words, the grid structure 21 deforms so that the mutually adjacent first end plate-shaped piece 224 and second end plate-shaped piece 234 tilt toward each other using a common intersection as a fulcrum.

[0046] Furthermore, each pair of third plate-like portions 240 is folded in half such that their respective fold lines 241 approach each other in the first direction A, or approach the center of the cylindrical body 24 in the first direction A. As a result, each of the pair of third plate-like portions 240 is deformed to become convex towards the center of the cylindrical body 24 and is folded in half. When the third plate-like portion 240 is folded in half, one side of the third plate-like portion 240, with the fold line 241 as the boundary, becomes the third plate-like piece 240A, and the other side becomes the third plate-like piece 240B. At this time, the tips of each of the pair of second end plate-like pieces 234 contact the inner circumferential surfaces of the third plate-like pieces 240A and 240B, connect to (continue with) the third plate-like pieces 240A and 240B, and are guided toward the corner plate portion 244 closest to the tip.

[0047] As shown in Figure 6(C), the cylindrical body 24 ultimately folds in two such that a pair of third plate-like parts 240 protrudes into the center of the interior of the cylindrical body 24, while a pair of fourth plate-like parts 242 maintain their shape. The ends of the folded cylindrical body 24 in the first direction A are composed of corner plate parts 244. When the cylindrical body 24 is folded, it shrinks in the second direction B. When the folded cylindrical body 24 is viewed from above along the axial direction of the cylindrical body 24, there are four corner plate parts 244, so the interior region of the cylindrical body 24 becomes a combined region of two consecutive trapezoidal-shaped regions with a common upper base. The upper base of the trapezoidal-shaped region is composed of a hypothetical line that passes through both of the pair of fold lines 241 when the folded cylindrical body 24 is viewed from above along the axial direction of the cylindrical body 24. The lower base of the trapezoidal region is composed of the inner surfaces of a pair of fourth plate-like portions 242 when the folded cylindrical body 24 is viewed in plan from the axial direction of the cylindrical body 24.

[0048] When the internal region of the cylindrical body 24 is divided into four sections at the center of the first direction A and the center of the second direction B, each of these sections is defined as a unit storage region P. Each unit storage region P is surrounded by the third plate-like piece 240A (third plate-like piece 240B), a part of the fourth plate-like section 242, and the corner plate section 244, and when viewed from above in the axial direction of the cylindrical body 24, it forms a trapezoidal shape. When the grid-like body 21 is folded, the adjacent first end plate-like piece 224 and second end plate-like piece 234 are stored in each unit storage region P. If the corner plate section 244 is absent, each unit storage region P forms a triangular shape when viewed from above in the axial direction of the cylindrical body 24. In the triangular shape, the passage width narrows as it approaches the corners of the cylindrical body 24, so the first end plate-like piece 224 and second end plate-like piece 234, which are stored in the unit storage region P, have difficulty moving close to the corners of the cylindrical body 24. As in this embodiment, if the corner plate portion 244 is located at a position corresponding to the corner of the cylindrical body 24, the passage width narrows as it approaches the corner of the cylindrical body 24. However, by making the width of the corner plate portion 244 an appropriate size, a passage width sufficient to allow the first end plate-shaped piece 224 and the second end plate-shaped piece 234 to move smoothly can be obtained. As a result, the folding operation of the base piece 20 can be performed smoothly. Note that the state of the base piece 20 shown in Figure 6(C) is just an example, and if the base piece 20 is made of a deformable material such as corrugated cardboard, the base piece 20 can be folded so that its thickness in the second direction B is even smaller than the state shown in Figure 6(C).

[0049] <Floorboard section> Referring to Figures 1 and 2, the floor plate portion 3 will be described below. As shown in Figure 1, the floor plate portion 3 is formed in a plate shape and is placed on the upper surface of the base portion 2. When the floor plate portion 3 is placed on the upper surface of the base portion 2, the upper surface of the base portion 2 is closed. It is preferable that the upper surface of the base portion 2 is the same size and shape as the floor plate portion 3, but it is not limited to this, and the floor plate portion 3 may be larger than the upper surface of the base portion 2. In this embodiment, the floor plate portion 3 is rectangular in shape, but it is not limited to this, and may be of other shapes. For example, the floor plate portion 3 may have an overall length in the range of 1900 (mm) to 2100 (mm) and an overall width in the range of 700 (mm) to 900 (mm).

[0050] <Engagement portion at one end in the longitudinal direction> As shown in Figures 1 and 2, the longitudinal end engagement portion 4 is formed in a plate shape, connected to (continuous with) the floor plate portion 3 at one end in the longitudinal direction, and extends in a direction perpendicular to the floor plate portion 3. When the floor plate portion 3 is installed on the base portion 2, as shown in Figure 1, the longitudinal end engagement portion 4 faces the end face (hereinafter referred to as the longitudinal end face) 200 of one end of the base portion 2 in the longitudinal direction. At this time, the longitudinal end engagement portion 4 may be in contact with the longitudinal end face 200, or there may be a gap between it and the longitudinal end face 200. In either state, when a force acts to cause the floor plate portion 3 to shift toward the other end of the base portion 2 in the longitudinal direction, the longitudinal end engagement portion 4 engages (contacts) with the longitudinal end surface 200, restricting the relative displacement of the floor plate portion 3 toward the other end of the base portion 2 in the longitudinal direction. The longitudinal direction of the base portion 2 is parallel to the arrangement direction of the base pieces 20.

[0051] In this embodiment, the longitudinal engagement portion 4 at one end is rectangular in shape, but it is not limited to this and may have other shapes.

[0052] <First width direction engaging part> The first widthwise engaging portion 5 is formed in a plate shape. There are two first widthwise engaging portions 5, and hereafter, one will be referred to as the first widthwise engaging portion 5A and the other as the first widthwise engaging portion 5B. The first widthwise engaging portion 5A is near the longitudinal one-end engaging portion 4 and is connected to (continuous with) the floor plate portion 3 at one end in the width direction of the floor plate portion 3, and extends in a direction perpendicular to the floor plate portion 3. The first widthwise engaging portion 5B is near the longitudinal one-end engaging portion 4 and is connected to (continuous with) the floor plate portion 3 at the other end in the width direction of the floor plate portion 3, and extends in a direction perpendicular to the floor plate portion 3. The first widthwise engaging portions 5A and 5B are parallel to each other and extend in the same direction as the longitudinal one-end engaging portion 4.

[0053] In this embodiment, the first widthwise engaging portion 5A is positioned perpendicular to the longitudinal one-end engaging portion 4 and connects to (continues with) the longitudinal one-end engaging portion 4 at one end in the widthwise direction. Similarly, the first widthwise engaging portion 5B is positioned perpendicular to the longitudinal one-end engaging portion 4 and connects to (continues with) the longitudinal one-end engaging portion 4 at the other end in the widthwise direction. As a result, as shown in Figure 2, the longitudinal one-end engaging portion 4 and the first widthwise engaging portions 5A and 5B form a first structure 11 with a U-shaped cross-section.

[0054] When the floor plate 3 is installed on the base 2, as shown in Figure 1, the first widthwise engaging portions 5A and 5B face the region (hereinafter referred to as the region near the end face; see Figure 2) 202 of a pair of widthwise end faces 201 at both ends of the base 2 (floor plate 3) in the widthwise direction. At this time, the first widthwise engaging portions 5A and 5B may be in contact with the region near the end face 202, or there may be a gap between them. In either state, when a force acts on the floor plate portion 3 to shift in the width direction of the base portion 2 relative to the base portion 2, the first width-direction engaging portions 5A and 5B engage (contact) with the area near one end face 202 with engaging surfaces 5A1 and 5B1 facing the area near one end face 202, thereby restricting the relative displacement of the floor plate portion 3 with respect to the base portion 2 in the width direction.

[0055] In this embodiment, the first widthwise engaging portion 5 is rectangular in shape, but it is not limited to this and may have other shapes.

[0056] Furthermore, as shown in Figures 7 and 9, the first width-direction engaging portion 5 (5A, 5B) has a step 50 on its outer plane that is aligned with its own width direction. The outer plane refers to the surface opposite to the engaging surfaces 5A1, 5B1 of the first width-direction engaging portion 5 (5A, 5B). The first width-direction engaging portion 5 (5A, 5B) can be divided in the width direction of the first width-direction engaging portion 5 (5A, 5B) by the step 50 as the boundary, into a proximal region 52 that is close to the longitudinal end engaging portion 4 and a distal region 54 that is distal to the longitudinal end engaging portion 4. The distal region 54 is recessed in the thickness direction of the first width-direction engaging portion 5 (5A, 5B) by the amount of the step 50 compared to the proximal region 52. As will be described later, in the case portion 10, the second width-direction engaging portion 7 fits into the recessed region 56.

[0057] <Engagement portion at the other end in the longitudinal direction> As shown in Figures 1 and 2, the longitudinal end engagement portion 6 is formed in a plate shape, connects to (continues with) the floor plate portion 3 at the other end in the width direction of the floor plate portion 3, and extends in a direction perpendicular to the floor plate portion 3. The longitudinal end engagement portion 6 extends in the same direction as the longitudinal end engagement portion 4.

[0058] When the floor plate 3 is installed on the base 2, as shown in Figure 1, the longitudinal end engagement portion 6 faces the end face 204 of the other end of the base 2 in the longitudinal direction (hereinafter referred to as the longitudinal end face; see Figure 2). At this time, the longitudinal end engagement portion 6 may be in contact with the longitudinal end face 204, or there may be a gap between it and the longitudinal end face 204. In either case, when a force acts to cause the floor plate 3 to shift toward one end of the base 2 in the longitudinal direction relative to the base 2, the longitudinal end engagement portion 6 engages (contacts) with the longitudinal end face 204, restricting the relative displacement of the floor plate 3 toward one end of the base 2 in the longitudinal direction relative to the base 2.

[0059] In this embodiment, the engagement portion 6 at the other end in the longitudinal direction is rectangular in shape, but it is not limited to this and may have other shapes.

[0060] <Second width direction engagement part> The second width-direction engaging portion 7 is formed in a plate shape. There are two second width-direction engaging portions 7, and hereafter, one will be referred to as the second width-direction engaging portion 7A and the other as the second width-direction engaging portion 7B. The second width-direction engaging portion 7A is near the other end engaging portion 6 in the longitudinal direction and is connected to (continuous with) the floor plate portion 3 at one end in the width direction of the floor plate portion 3, and extends in a direction perpendicular to the floor plate portion 3. The second width-direction engaging portion 7B is near the other end engaging portion 6 in the longitudinal direction and is connected to (continuous with) the floor plate portion 3 at the other end in the width direction of the floor plate portion 3, and extends in a direction perpendicular to the floor plate portion 3. The second width-direction engaging portions 7A and 7B are parallel to each other and extend in the same direction as the other end engaging portion 6 in the longitudinal direction.

[0061] In this embodiment, the second widthwise engaging portion 7A is positioned perpendicular to the other end engaging portion 6 in the longitudinal direction and connects (continues with) the other end engaging portion 6 in the longitudinal direction at one end in the width direction. Similarly, the second widthwise engaging portion 7B is positioned perpendicular to the other end engaging portion 6 in the longitudinal direction and connects (continues with) the other end engaging portion 6 in the width direction at the other end of the other end engaging portion 6 in the longitudinal direction. As a result, as shown in Figure 2, the second structure 12 with a U-shaped cross-section is formed by the other end engaging portion 6 in the longitudinal direction and the second widthwise engaging portions 7A and 7B.

[0062] When the floor plate 3 is installed on the base 2, as shown in Figure 1, the second widthwise engaging portions 7A and 7B face the region (hereinafter referred to as the region near the other end face; see Figure 2) 206 of the other end face in the longitudinal direction at a pair of widthwise end faces 201 at both ends of the base 2 (floor plate 3) in the widthwise direction. At this time, the second widthwise engaging portions 7A and 7B may be in contact with the region near the other end face 206, or there may be a gap between them. In either state, when a force acts on the floor plate portion 3 to shift in the width direction of the base portion 2 relative to the base portion 2, the second width direction engaging portions 7A and 7B engage (contact) with the region near the other end face 206 with engaging surfaces 7A1 and 7B1 facing the region near the other end face 206, thereby restricting the relative displacement of the floor plate portion 3 with respect to the base portion 2 in the width direction.

[0063] <Gripping part> The gripping portion 8 functions as a handle for the case portion 10. In this embodiment, the gripping portion 8 is provided so as to protrude from the outer surface 4A of the longitudinally engaging portion 4 in a direction away from the outer surface 4A. The outer surface 4A refers to the surface opposite to the surface facing the longitudinally engaging portion 6. The gripping portion 8 may also be provided on the longitudinally engaging portion 6 in the same way as the longitudinally engaging portion 4.

[0064] <Mounting section> As described above, the floor plate portion 3, the longitudinal engagement portion 4 at one end, the first widthwise engagement portion 5, the longitudinal engagement portion 6 at the other end, and the second widthwise engagement portion 7 are configured such that, as shown in Figures 2 and 7, the mounting portion has a configuration in which the first structure 11 and the second structure 12, which have a U-shaped cross-section, are connected to both ends of the floor plate portion 3 in the longitudinal direction, in a position perpendicular to the floor plate portion 3. The present invention also includes cases where the mounting portion includes a gripping portion 8.

[0065] Figure 7(A) is an unfolded view of the mounting section. The plate-like body when the mounting section is unfolded has a first plate-like piece 35, a second plate-like piece 36, a pair of third plate-like pieces 37A, a pair of fourth plate-like pieces 37B, a fifth plate-like piece 38, a pair of sixth plate-like pieces 39A, and a pair of seventh plate-like pieces 39B.

[0066] The first plate-shaped piece 35 is composed of the first floor plate piece 30, the second floor plate piece 31, the third floor plate piece 32, the fourth floor plate piece 33, and the fifth floor plate piece 34, which will be described later, and corresponds to the floor plate section 3. The second plate-shaped piece 36 extends from the longitudinal end of the first floor plate piece 30 and corresponds to the longitudinal one-end engagement portion 4. A pair of third plate-shaped pieces 37A extend from both widthwise ends of the first floor plate piece 30 and form part of the first widthwise engagement portion 5. A pair of fourth plate-shaped pieces 37B extend from both widthwise ends of the second plate-shaped piece 36 and form part of the first widthwise engagement portion 5. The fifth plate-shaped piece 38 extends from the longitudinal end of the fifth floor plate piece 34 and corresponds to the longitudinal other-end engagement portion 6. A pair of sixth plate-shaped pieces 39A extend from both widthwise ends of the fifth floor plate piece 34 and form part of the second widthwise engagement portion 7. A pair of seventh plate-shaped pieces 39B extend from both ends of the fifth plate-shaped piece 38 in the width direction and form part of the second width-direction engaging portion 7. A fold line is formed at the boundary of each plate-shaped piece.

[0067] Furthermore, in the plate-like body with the mounting section unfolded, the outer edges of both ends in the width direction of the first floor plate piece 30, the second floor plate piece 31, the third floor plate piece 32, and the fourth floor plate piece 33 are located on the same straight line. The fold lines of one pair of sixth plate-like pieces 39A and one pair of seventh plate-like pieces 39B are located offset outward in the width direction of the first plate-like piece 35 from the aforementioned same straight line.

[0068] The second plate-shaped piece 36 is folded along the corresponding fold line to position it perpendicular to the first plate-shaped piece 35. Also, one pair of third plate-shaped pieces 37A are folded along the corresponding fold line so that they extend to the same side as the second plate-shaped piece 36 to position the pair of third plate-shaped pieces 37A perpendicular to the first plate-shaped piece 35. Furthermore, one pair of fourth plate-shaped pieces 37B are folded along the corresponding fold line so that they overlap the pair of third plate-shaped pieces 37A, and when the overlapping third plate-shaped pieces 37A and fourth plate-shaped pieces 37B are connected, a first structure 11 with a U-shaped cross-section is formed that connects to one end of the floor plate section 3.

[0069] In this case, the fourth plate-shaped piece 37B has the same height as the third plate-shaped piece 37A, but its width is smaller than that of the third plate-shaped piece 37A. Therefore, a step 50 and a recessed area 56 are formed in the first widthwise engaging portion 5.

[0070] Similarly, the fifth plate-shaped piece 38 is folded along the corresponding fold line so that it extends to the same side as the second plate-shaped piece 36, so that the fifth plate-shaped piece 38 is positioned perpendicular to the first plate-shaped piece 35. Also, one pair of sixth plate-shaped pieces 39A are folded along the corresponding fold line so that they extend to the same side as the fifth plate-shaped piece 38, so that the one pair of sixth plate-shaped pieces 39A is positioned perpendicular to the first plate-shaped piece 35. Furthermore, one pair of seventh plate-shaped pieces 39B are folded along the corresponding fold line so that they overlap the one pair of sixth plate-shaped pieces 39A, and when the overlapping sixth plate-shaped pieces 39A are connected, a second structure 12 with a U-shaped cross-section is formed that connects to the other end of the floor plate section 3.

[0071] Since the first structure 11 and the second structure 12, which have a U-shaped cross-section, are configured as described above, the longitudinal end engagement portion 4 and a pair of first widthwise engagement portions 5, as well as the longitudinal end engagement portion 6 and a pair of second widthwise engagement portions 7, are connected, and the positions of the longitudinal end engagement portion 4, the pair of first widthwise engagement portions 5, the longitudinal end engagement portion 6, and the pair of second widthwise engagement portions 7 are firmly maintained.

[0072] <Case section> Referring to Figures 7-9, the case section 10 will be described below. The mounting section can be transformed into the case section 10.

[0073] As shown in Figures 7(A) and (B), the floorboard section 3 has four fold lines 301 to 304 extending in the width direction of the floorboard section 3. To distinguish them from the other fold lines, the fold lines 301 to 304 may be called floor-side fold lines 301 to 304. The floorboard section 3 is provided at intervals along its length and can be folded at each of the floor-side fold lines 301 to 304.

[0074] For the sake of explanation, as shown in Figures 7 and 8, the floor plate section 3 is divided into five floor plate pieces (regions) with floor-side fold lines 301 to 304 as boundaries. These five floor plate pieces (regions) are defined as the first floor plate piece 30, the second floor plate piece 31, the third floor plate piece 32, the fourth floor plate piece 33, and the fifth floor plate piece 34, in order from one end to the other in the longitudinal direction of the floor plate section 3. The surface of the floor plate section 3 that faces the base section 2 when the floor plate section 3 is placed on the base section 2 is defined as the bottom surface of the floor plate section 3. The space surrounded by the first floor plate piece 30, the longitudinal end engagement portion 4, and the first widthwise engagement portion 5 becomes the storage space S of the case section 10, as shown in Figure 7(B).

[0075] As shown in Figure 8(B), the mounting section becomes the case section 10 by folding each floor plate piece (first floor plate piece 30, second floor plate piece 31, third floor plate piece 32, fourth floor plate piece 33, fifth floor plate piece 34) to the same side along the corresponding fold lines (fold lines 301-304). In other words, the case section 10 is formed by folding each floor plate piece (first floor plate piece 30, second floor plate piece 31, third floor plate piece 32, fourth floor plate piece 33, fifth floor plate piece 34) along the floor-side fold lines 301-304 so that the lower surface of each floor plate piece (first floor plate piece 30, second floor plate piece 31, third floor plate piece 32, fourth floor plate piece 33, fifth floor plate piece 34) faces the storage space S side. Specifically, the second floor plate piece 31 is folded so that the lower surface of the second floor plate piece 31 faces the storage space S side, and the second floor plate piece 31 is positioned perpendicular to the first floor plate piece 30. Next, the third floor plate piece 32 is bent so that its lower surface faces the storage space S, and the third floor plate piece 32 is positioned perpendicular to the second floor plate piece 31, while the lower surface of the first floor plate piece 30 and the lower surface of the third floor plate piece 32 face each other. Subsequently, the fourth floor plate piece 33 is bent so that its lower surface faces the storage space S, and the fourth floor plate piece 33 is positioned perpendicular to the third floor plate piece 32, while the fourth floor plate piece 33 overlaps the engagement portion 4 at one end in the longitudinal direction. At this time, the gripping portion 8 is passed through the through hole 330 that penetrates the fourth floor plate piece 33.

[0076] Furthermore, the fifth floor plate piece 34 is bent so that its lower surface faces the storage space S, and the fifth floor plate piece 34 is positioned perpendicular to the fourth floor plate piece 33, while overlapping the first floor plate piece 30. At this time, the second widthwise engaging portions 7A and 7B connected to the fifth floor plate piece 34 enter the recessed areas 56 of the first widthwise engaging portions 5A and 5B and overlap the first widthwise engaging portions 5A and 5B. Also, the other end engaging portion 6 in the longitudinal direction overlaps the second floor plate piece 31.

[0077] As described above, the case portion 10 shown in Figure 8(C) is formed. Here, in the case portion 10, as shown in Figure 8(D), the portion on which the grip portion 8 is provided is defined as the upper part 101 of the case portion 10, the portion opposite the upper part is defined as the bottom part 103 of the case portion 10, and the portion between the upper part 101 and the bottom part 103 that surrounds the storage space S is defined as the first side wall portion to the fourth side wall portion of the case portion 10. Then, as shown in Figure 8(C), the direction parallel to the direction from the bottom 103 to the top 101 is defined as the height direction H of the case portion 10, the direction perpendicular to the height direction and parallel to the width direction of each floor plate piece (first floor plate piece 30, second floor plate piece 31, third floor plate piece 32, fourth floor plate piece 33, fifth floor plate piece 34) is defined as the first direction W of the case portion 10, and the direction perpendicular to the height direction and parallel to the width direction of the engagement portion 4 at one end in the longitudinal direction and the engagement portion 6 at the other end in the longitudinal direction is defined as the second direction D of the case portion 10.

[0078] The upper part 101 of the case section 10 is composed of longitudinally overlapping one-end engaging parts 4 and a fourth floor plate piece 33. Preferably, the longitudinally overlapping one-end engaging parts 4 and the fourth floor plate piece 33 are substantially the same shape and size. Furthermore, in the upper part 101, the gripping part 8 engages with the fourth floor plate piece 33 by passing through the through hole 330 of the fourth floor plate piece 33, thereby preventing the case section 10 from opening during transport.

[0079] The bottom portion 103 of the case portion 10 is composed of overlapping longitudinal end engagement portions 6 and a second floor plate piece 31. Preferably, the longitudinal end engagement portions 6 and the second floor plate piece 31 are substantially the same shape and size.

[0080] The first side wall portion 105 of the case portion 10 is connected to (continuous with) the upper portion 101 and the bottom portion 103 of the case portion 10 and is composed of a first floor plate piece 30 and a fifth floor plate piece 34 that overlap each other. Preferably, the first floor plate piece 30 and the fifth floor plate piece 34 are substantially the same shape and size.

[0081] The second side wall portion 106 of the case portion 10 is connected to (continuous with) the upper portion 101 and the bottom portion 103 of the case portion 10, faces the first side wall portion 105 in the second direction D, and is composed of a third floor plate piece 32. Preferably, the third floor plate piece 32 is substantially the same shape and size as the first floor plate piece 30 and the fifth floor plate piece 34.

[0082] The third side wall portion 107 of the case portion 10 is located between the first side wall portion 105 and the second side wall portion 106, and is composed of one first width-direction engaging portion 5A and one second width-direction engaging portion 7A that overlap each other.

[0083] The fourth side wall portion 108 of the case portion 10 is located between the first side wall portion 105 and the second side wall portion 106, and faces the third side wall portion 107 in the first direction W. It is composed of the other first width-direction engaging portion 5B and the other second width-direction engaging portion 7B that overlap each other.

[0084] The first side wall 105, the third side wall 107, the second side wall 106, and the fourth side wall 108 are arranged in that order in the circumferential direction of the case portion 10, surrounding the storage space S. In this embodiment, the first side wall 105, the third side wall 107, the second side wall 106, and the fourth side wall 108 are connected to each other (continuous) when adjacent, and extend around the entire circumference of the case portion 10. Furthermore, the first side wall 105, the third side wall 107, the second side wall 106, and the fourth side wall 108 are connected to the upper portion 101 and the bottom portion 103. As a result, each surface of the case portion 10 is completely enclosed.

[0085] However, as shown in the modified examples in Figures 9(A) to (D), the third side wall portion 107 and the fourth side wall portion 108 may be configured to have an open area in part of the case portion 10 by changing the shape and size of the first width-direction engaging portions 5A, 5B and the second width-direction engaging portions 7A, 7B. In Figure 9(A), the height of the first width-direction engaging portions 5A, 5B and the second width-direction engaging portions 7A, 7B is lower than in the first embodiment. In this case, as shown in Figure 9(B), an open area K1 is formed on the side of the case portion 10 that is closed by the third side wall portion 107 and the fourth side wall portion 108. The open area K1 corresponding to the third side wall portion 107 (fourth side wall portion 108) is adjacent in the second direction D. In this case, the third side wall portion 107 and the fourth side wall portion 108 are connected to (continuous with) the upper portion 101, the bottom portion 103 and the first side wall portion 105, but not to the second side wall portion 106.

[0086] Furthermore, in Figure 9(C), the longitudinal end engagement portion 4 and the first widthwise engagement portions 5A, 5B are spaced apart. Also, the longitudinal end engagement portion 6 and the second widthwise engagement portions 7A, 7B are spaced apart. In this case, as shown in Figure 9(D), an open area K2 is formed in the lateral region where the third side wall portion 107 and the fourth side wall portion 108 of the case portion 10 are located. The open area K2 corresponding to the third side wall portion 107 (fourth side wall portion 108) is arranged alternately in the first direction W. In this case, the third side wall portion 107 and the fourth side wall portion 108 are connected to (continuous with) the first side wall portion 105 and the second side wall portion 106, but not to the upper portion 101 and the bottom portion 103.

[0087] Furthermore, as shown in Figure 9(E), the case portion 10 may have an open area K3 formed in the lateral region where the third side wall portion 107 and the fourth side wall portion 108 of the case portion 10 are located, and the third side wall portion 107 and the fourth side wall portion 108 may be connected to (continuous with) the first side wall portion 105 but not to the upper portion 101, the bottom portion 103, and the second side wall portion 106. Also, as shown in Figure 9(F), the case portion 10 may have an open area K4 formed in the lateral region where the third side wall portion 107 and the fourth side wall portion 108 of the case portion 10 are located, and the third side wall portion 107 and the fourth side wall portion 108 may be connected to (continuous with) the upper portion 101 and the bottom portion 103 but not to the first side wall portion 105 and the second side wall portion 106.

[0088] As described above, various configurations of open areas other than those described above can be formed by connecting the first widthwise engaging portions 5A and 5B to the longitudinal end engaging portion 4, or to the first floor plate piece 30, or to both the longitudinal end engaging portion 4 and the first floor plate piece 30, or by changing the size of the first widthwise engaging portions 5A and 5B. Similarly, various configurations of open areas other than those described above can be formed by connecting the second widthwise engaging portions 7A and 7B to the longitudinal end engaging portion 6, or to the fifth floor plate piece 34, or to both the longitudinal end engaging portion 6 and the fifth floor plate piece 34, or by changing the size of the second widthwise engaging portions 7A and 7B. As a result, an open area is formed in the lateral region where the third side wall portion 107 and the fourth side wall portion 108 of the case portion 10 are located, and all embodiments of the case portion 10 in which the third side wall portion 107 and the fourth side wall portion 108 are connected to (continuous with) at least one of the upper portion 101, the bottom portion 103, the first side wall portion 105, and the second side wall portion 106 are included within the scope of the present invention.

[0089] Here, with reference to Figure 10, the second side wall portion 106 and the fourth side wall portion 108 of the case portion 10 will be further described. The first width-direction engaging portion 5 is provided with a recessed area 56 into which the second width-direction engaging portion 7 fits. When the second width-direction engaging portion 7 fits into the recessed area 56 of the first width-direction engaging portion 5, the recessed area 56 is occupied by the second width-direction engaging portion 7, as shown in Figures 10(A) and (B).

[0090] Furthermore, when opening the case section 10, as shown in Figure 10(C), it is necessary to rotate the second structure 12 together with the fifth floor plate piece 34 around the fold line 304 as an axis. Since the second structure 12 has a certain amount of weight, it becomes difficult to rotate it in the direction that opens the fifth floor plate piece 34 during transport.

[0091] <Relationship between the size of the laminated base pieces and the size of the storage space in the case section> Referring to Figure 11, the relationship between the size of the laminated body 250 of the three base pieces 20 and the size of the storage space S in the case section 10 will be explained. The laminated body 250 is made by stacking multiple base pieces 20 while aligning the base pieces 20 so that the fourth plate-shaped parts 242 of the folded base pieces 20 (cylindrical body 24) overlap each other. The laminated body 250 is stacked so that the height and width of the laminated body 250 match the height and width of the folded base pieces 20. The laminated body 250 is then housed in the storage space S of the case section 10 so that the height and width of the laminated body 250 match the height and width of the storage space S of the case section 10. Preferably, the height H1 and width W1 of the laminated body 250 match or are slightly smaller than the height H2 and width W2 of the storage space S of the case section 10.

[0092] Furthermore, it is envisioned that the case section 10 will accommodate not only the laminated body 250, but also the fitting plate-like bodies 26, which will be stacked on top of the fourth plate-like portion 242 of the laminated body 250. The number of fitting plate-like bodies 26 is equal to the number of base pieces 20. From the viewpoint of reducing the weight of the bed, it is preferable to make the size of the case section 10 as small as possible. For this reason, it is preferable that the total thickness of the laminated body 250 and all the fitting plate-like bodies 26 matches the depth D2 of the storage space S of the case section 10. In this sense, it is preferable that the thickness D1 of the laminated body 250 in the stacking direction of the multiple base pieces 20 be smaller than the depth D2 of the storage space S of the case section 10 by the amount of the fitting plate-like bodies 26.

[0093] As described above, with the case section 10 (mounting section) and base section 2 (base piece 20) configured in this way, the size of the case section 10 (mounting section) can be minimized. As a result, the weight of the case section 10 (mounting section) and base section 2 (base piece 20) can be reduced.

[0094] It should be noted that the bed of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. [Explanation of Symbols]

[0095] 1 bed 2. Base 3. Floorboard section 4. Engaging portion at one end in the longitudinal direction 5,5A,5B First width direction engaging part 6. Engaging portion at the other end in the longitudinal direction 7,7A,7B Second width direction engaging part 8 Gripping part 10 Case section 11 First structure 12 Second structure 20 base pieces 21 Lattice body 22 First plate-like portion 23 Second plate-like portion 24. Cylindrical body 26 Fitting plate-like body 30 First floorboard piece 31 Second floor plate piece 32 Third floorboard piece 33 Fourth floor plate piece 34 Fifth floorboard piece 35 First plate-like piece 36 Second plate-like piece 37A Third plate piece 37B Fourth plate 38 Fifth plate 39A Sixth plate piece 39B Seven plates 50 steps 52 Proximal region 54 Distal region 56 Concave area 101 Top 103 Bottom 105 First side wall part 106 Second side wall part 107 Third side wall section 108 Fourth side wall section 200 One end face in the longitudinal direction 201 Width end face 202 Region near one end face 204 Other end face in the longitudinal direction 206 Region near the other end face 210 Cylindrical section (Cylindrical section on the grid side) 220 Linear graph (square-shaped linear graph) 222 First central plate-like segment 224 First end plate-shaped piece 226,236 slits 232 Second central plate-like segment 234 Second end plate piece 240 Third plate-like part 241 Broken line (broken line on the tube side) 242 Fourth plate-like part 244 Square plate part 250-layer structure 301-304 Linear graph (floor-side linear graph) 330 Through hole S Containment space

Claims

1. A base that is designed to be foldable, A plate-shaped floor plate placed on the base portion, A longitudinal end engaging portion is provided, which is connected to the floor plate at one end in the longitudinal direction of the floor plate and engages with the end face of one end of the base in the longitudinal direction (hereinafter referred to as the longitudinal end face) to restrict the relative displacement of the floor plate toward the other end of the base in the longitudinal direction relative to the base; A pair of first widthwise engaging portions connect to the floor plate portion at both ends in the width direction of the floor plate portion and engage with a region near one of the longitudinal end faces of a pair of widthwise end faces at both ends in the width direction of the base portion (hereinafter referred to as the region near one end face), thereby restricting the relative displacement of the base portion and the floor plate portion in the width direction of the base portion, The other end of the floor plate portion is connected to the floor plate portion at the other end in the longitudinal direction and engages with the other end face of the base portion in the longitudinal direction (hereinafter referred to as the other end face in the longitudinal direction), thereby restricting the relative displacement of the base portion and the floor plate portion toward one end of the base portion in the longitudinal direction, A pair of second widthwise engaging portions connects to the floor plate at both ends in the width direction of the floor plate and engages with a region near the other end face in the length direction of a pair of widthwise end faces (hereinafter referred to as the region near the other end face), thereby restricting the relative displacement of the base portion and the floor plate portion in the width direction of the base portion. Equipped with, The floorboard portion has a plurality of floor-side fold lines that extend in the width direction of the floorboard portion and are provided at intervals in the length direction of the floorboard portion for bending the floorboard portion. The floor plate portion, the longitudinal end engagement portion, the first widthwise engagement portion, the longitudinal end engagement portion, and the second widthwise engagement portion are characterized in that they constitute a case portion having a storage space capable of accommodating the base portion in a folded state by folding the floor plate portion to the same side along a plurality of floor-side fold lines. bed.

2. The case portion is provided with a gripping portion for gripping the case portion, which is provided on the engagement portion at one end in the longitudinal direction or the engagement portion at the other end in the longitudinal direction. The floor plate portion is characterized by being folded to the same side along multiple floor-side fold lines, and having through holes for passing the gripping portion when the floor plate portion overlaps with the engagement portion at one end in the longitudinal direction or the engagement portion at the other end in the longitudinal direction. The bed according to claim 1.

3. The floor plate section has four of the floor-side bend lines, When the floorboard section is divided into five floorboard pieces using the four aforementioned floor-side bend lines as boundaries, and these floorboard pieces are defined as the first floorboard piece, the second floorboard piece, the third floorboard piece, the fourth floorboard piece, and the fifth floorboard piece in order from one end to the other in the longitudinal direction of the floorboard section, The aforementioned case section is The upper part is composed of the overlapping longitudinal end engagement portions and the four floor plate pieces, The bottom portion is formed by the mutually overlapping second floor plate pieces and the longitudinal end engagement portion, The first side wall portion is formed by the first floor plate piece and the fifth floor plate piece, which are connected to the upper and lower portions and overlap each other, A second side wall portion is connected to the upper and lower portions, faces the first side wall portion, and is formed by the third floor plate piece, A third side wall portion is located between the first side wall portion and the second side wall portion and is formed by one of the first width-direction engaging portions and one of the second width-direction engaging portions that overlap each other, A fourth side wall portion is located between the first side wall portion and the second side wall portion, and is opposed to the third side wall portion, and is formed by the remaining first width-direction engaging portion and the remaining second width-direction engaging portion that overlap each other, It has, The first side wall, the third side wall, the second side wall, and the fourth side wall are arranged in that order in the circumferential direction of the case portion, and surround the storage space. The bed according to claim 1.

4. The case portion is provided with a gripping portion at one end of the longitudinal engagement portion, The fourth floor plate piece is characterized by having a through hole in the longitudinal end engagement portion for passing the gripping portion when the floor plate portion overlaps with the floor plate portion, by folding the floor plate portion to the same side along a plurality of floor-side fold lines. The bed according to claim 3.

5. Each pair of the first widthwise engaging portions has a step along the width direction of the first widthwise engaging portion on the outer plane opposite to the engaging surface that engages with the region near the one end face, When the step is used as a boundary to divide the first widthwise engaging portion into a proximal region near the longitudinal end engaging portion and a distal region distal to the longitudinal end engaging portion, The distal region is recessed compared to the proximal region by the amount of the step. In the case portion, the second widthwise engaging portion is characterized by fitting into the recessed area of ​​the distal region. The bed according to claim 3.

6. The base portion has a plurality of base pieces arranged in a row along the length of the base portion, The base piece is characterized by being constructed to be foldable. The bed according to claim 1.

7. The aforementioned base piece is, A grid-like structure is formed by connecting one set of first plate-like parts and one set of second plate-like parts in a grid-like pattern, A cylindrical body that surrounds the grid body and engages with the grid body to hold the grid body, It has, Each of the pair of the first plate-like portions has a grid-side bend line extending in the height direction of the grid body at the center of the width direction of the first plate-like portion, The cylindrical body is A part of the cylindrical body, a pair of third plate-like parts facing a pair of first plate-like parts, A part of the cylindrical body, a set of fourth plate-like parts facing a set of second plate-like parts, It has, Each pair of the third plate-like portions has a cylindrical bend extending in the height direction of the cylindrical body at the center of the width direction of the third plate-like portion, The lattice body and the cylindrical body are folded using one set of the grid-side fold lines and one set of the cylindrical-side fold lines, such that the set of grid-side fold lines and the set of cylindrical-side fold lines approach the center of the cylindrical body, thereby deforming one set of the third plate-like parts and one set of the first plate-like parts to protrude towards the center of the cylindrical body, and the lattice body and the cylindrical body are folded in this manner. The bed according to claim 6.

8. The cylindrical body has plate-shaped corner portions at each of the four corners of the cylindrical body, which are connected in the circumferential direction to both the third plate-shaped portion and the fourth plate-shaped portion. When the cylindrical body is folded, a first direction is defined in which the length of the cylindrical body is shortened while being perpendicular to the axial direction of the cylindrical body, and a second direction is defined in which the length of the cylindrical body is perpendicular to both the axial direction of the cylindrical body and the first direction, The folded cylindrical body is characterized in that both ends in the second direction are composed of the rectangular plate portion, The bed according to claim 7.

9. When the folded cylindrical body is viewed in plan from the axial direction of the cylindrical body, the internal region of the cylindrical body is characterized by being a combined region of two continuous trapezoidal regions, each with the inner circumferential surface of one pair of the four plate-like parts as its lower base, and a line passing through both of the pair of cylindrical side fold lines as a virtual common upper base. The bed according to claim 8.

10. The base piece is characterized by having a plate-shaped fitting plate that is inserted into the hollow portion of the cylindrical part of the grid body and fits into the cylindrical part on the inner circumference side of the cylindrical part. The bed according to claim 7.

11. The laminate, formed by aligning the four plate-shaped portions of the cylindrical body so that they overlap, and stacking multiple folded base pieces, is housed in the storage space of the case such that the height and width of the laminate coincide with the height and width of the storage space of the case. The height and width directions of the laminate coincide with the height and width directions of the base piece in its folded state. The height and width of the laminate are characterized by being the same as the height and width of the storage space in the case section. The bed according to claim 7.

12. The length of the laminate in the stacking direction of the base pieces is smaller than the depth of the storage space in the case portion. The bed according to claim 11.

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