Collapsible boat and method of making same

Abstract

To easily fold a sheet material from one rectangular sheet material, to position and store a plurality of sheets in a flatly folded state when not in use, and to stably secure a three dimensional boat-shaped storage space when in use.SOLUTION: The folding boat-shaped container 1 has a predetermined basic fold in one rectangular sheet material S, and a container body 2 is composed of a bottom part 3 and a side peripheral part 4 surrounding the peripheral edge of the bottom part 3. The bottom portion 3 is foldable, and the side peripheral portion 4 includes a single-sheet outer shape body portion side L3 provided facing the symmetrical parallel line fold side 4a of the bottom portion 3, a multi-sheet stacked reinforcing body portion side L4 provided facing the V-shaped fold side 4b of the bottom portion 3, and a holding portion side 4a that holds a part of the reinforcing body portion side 4b protruding from the outer shape body portion side 4a by folding the part of the reinforcing body portion side 4c into opening edges on both sides in a longitudinal direction of the outer shape body portion side wall, the container body 2 can be deformed into a flat first shape as a shape at the time of non-use and a second shape for securing a boat-shaped housing space part 5 as a shape at the time of use.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a collapsible boat and a method for making the same. [Background technology]

[0002] As conventional foldable containers, those described in Patent Documents 1 to 3, for example, are already known. Patent Document 1 discloses a paper storage device for refrigerators that can be placed in the vegetable compartment of the refrigerator, which is made of water-resistant and strong paper that can be folded, and has a storage section that can store vegetables, and the storage section has a box-like shape that includes a bottom and sides that stand upright on the bottom, and when assembled and stood up, a spatial area is formed in which vegetables placed inside from the ceiling are stored. Patent Document 2 discloses a foldable container in which a base sheet is folded from an unfolded state, the base sheet having a bottom fold line that forms a bottom wall portion and side fold lines that form side walls, and a connecting portion that connects a pair of adjacent side walls and is formed to be foldable; the connecting portion has first and second radial fold lines that extend from each of the four corners of the bottom wall portion to the outer edge of the base sheet and can be bent inward, and fold-back lines that connect the tips of the first and second radial fold lines; the connecting portion is formed to be foldable on the inner surface of one of a pair of adjacent side walls by folding the side fold line and the first radial fold line; a second foldable piece that is formed to be foldable by folding the side fold line and the second radial fold line; and a fold-back piece that can maintain the folded state of one of the first and second foldable pieces via the fold-back lines. Patent Document 3 discloses a portable tableware box that includes a first surface and a second surface that are symmetrical to each other and hermetically connected on both the left and right sides, a cavity formed between the first and second surfaces, and a bottom surface that closes the bottom of the cavity, the bottom surfaces including a first bottom surface and a second bottom surface, the inner surface of the first bottom surface being in close contact with the inner bottom surface of the first surface, the lower bottom edge of the first bottom surface overlapping the lower edge of the first surface, and the bottom of the first bottom surface being hermetically connected to the bottom of the first surface to form a first support. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-126799 A (Form for carrying out the invention, Figure 1) [Patent Document 2] Utility Model Registration No. 3241618 (Mode for carrying out the invention, Figure 2) [Patent Document 3] Utility Model Registration No. 3242128 (Mode for carrying out the invention, Figure 3) Summary of the Invention [Problem to be solved by the invention]

[0004] The inventions described in Patent Documents 1 to 3 are all foldable containers, but they cannot be said to solve the technical problems that the present invention aims to solve, as described below. The technical problem that this invention aims to solve is to provide a foldable boat-shaped container and a method for manufacturing the same that can be easily folded from a single rectangular sheet of material, can store multiple copies in a flat folded state when not in use, and can stably secure a three-dimensional boat-shaped storage space when in use. [Means for solving the problem]

[0005] A first technical feature of the present invention is a container body having basic folds including a pair of diagonal folds along diagonals, a symmetrical centerline fold that folds the sheet material symmetrically through the center of the diagonal folds, a pair of symmetrical parallel folds that fold the sheet material in parallel along symmetrical positions sandwiching the symmetrical centerline fold, and a V-shaped fold that extends in a V shape from four intersections of the pair of diagonal folds and the pair of symmetrical parallel folds to the symmetrical centerline fold outside a rectangular area surrounded by the four intersections, the container body being formed by a bottom of a hexagonal area surrounded by the pair of symmetrical parallel folds and the V-shaped fold, and side peripheral parts surrounding the periphery of the bottom, the bottom being foldable into a mountain fold with the symmetrical centerline fold as a boundary, and the side peripheral parts being formed by a hexagonal area surrounded by the pair of symmetrical parallel folds and the V-shaped fold This foldable boat-shaped container has an outer body portion made of a single piece that is located at the portion facing the symmetrical parallel line fold and forms the outer shape, a reinforcing body portion made of multiple layers that is located at the portion facing the V-shaped fold of the bottom and reinforces the areas on both longitudinal sides of the outer body portion, and a holding portion that folds and holds a portion of the reinforcing body portion protruding from the outer body portion over the opening edges on both longitudinal sides of the outer body portion, and is characterized in that the container body can be transformed into a first shape when not in use, which is a flattened shape in which the bottom is folded in a mountain fold along the symmetrical center line fold and the side periphery is folded around the folded bottom, and a second shape when in use, in which the folded state of the bottom is expanded and a boat-shaped storage space is created between the bottom and the side periphery.

[0006] A second technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the holding portion includes a covering fold portion that folds a portion of the reinforcing body portion protruding from the outer body portion over the opening edges on both longitudinal sides of the outer body portion. A third technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the holding portion has a first holding portion that folds and holds a portion of the reinforcing body portion protruding from the outer body portion inside the opening edge on both longitudinal sides of the outer body portion, and a second holding portion that folds and holds the portion outside the opening edge. A fourth technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the sheet material is made of a material with excellent water resistance, at least on the inner surface of the container body. A fifth technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the sheet material is rectangular and the symmetrical center line fold extends parallel to the long side of the sheet material. A sixth technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the V-shaped fold is formed parallel to one of the diagonal folds. A seventh technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that, when the distance between the symmetrical parallel line fold and the symmetrical center line fold is d1 and the distance between the symmetrical parallel line fold and the edge of the sheet material parallel to the symmetrical parallel line fold is d2, d2 / 3≦d1≦d2. The eighth technical feature of the present invention is a foldable boat-shaped container having the first technical feature, characterized in that the outer body portion, the reinforcing body portion, and the retaining portion that constitute the side periphery have a symmetrical shape with respect to an intersecting center line that passes through the center of the symmetrical center line fold. A ninth technical feature of the present invention is a foldable boat-shaped container characterized in that, when storing multiple foldable boat-shaped containers having the first technical feature in a first shape, the mountain-folded bottom of the container body constituting one foldable boat-shaped container is sandwiched into the mountain-folded groove of the bottom of the container body constituting another foldable boat-shaped container, and the containers are positioned and stacked.

[0007] A tenth technical feature of the present invention is a method for producing a foldable boat-shaped container from a single rectangular sheet material, comprising: a basic fold making step of folding the sheet material along basic folds, the basic folds including a pair of diagonal folds along diagonals, a symmetrical center fold that folds the sheet material symmetrically through the center of the diagonal folds, a pair of symmetrical parallel folds that fold the sheet material parallel to symmetrical positions on either side of the symmetrical center fold, and a V-shaped fold that extends in a V shape from four intersections of the pair of diagonal folds and the pair of symmetrical parallel folds to the symmetrical center fold outside a rectangular area surrounded by the four intersections; a first folding step of folding a bottom portion of a hexagonal area surrounded by the pair of symmetrical parallel folds and the V-shaped fold made in the basic fold making step in a mountain fold with the symmetrical center fold as a boundary; and a second folding step of folding the sheet material after the first folding step in a mountain fold. and a second folding step of folding the folded-in bottom portion into the area of ​​the side periphery surrounding the periphery of the bottom portion of the plastic material, the second folding step including the steps of: folding a one-piece outer body portion by valley-folding the area facing the pair of symmetrical parallel folds to form the outer shape; folding a reinforcing body portion of multiple layers by valley-folding the area facing the V-shaped folds to reinforce the areas on both longitudinal sides of the outer body portion; and folding a retaining portion that folds and holds a portion of the reinforcing body portion protruding from the outer body portion onto the opening edges on both longitudinal sides of the outer body portion, thereby making the container body consisting of the bottom and the side periphery deformable between a flattened first shape and a second shape in which the folded state of the bottom is expanded and the bottom and the side periphery form a boat-shaped storage space. [Effects of the Invention]

[0008] According to the first technical feature of the present invention, the product can be easily folded from a single rectangular sheet material, and when not in use, multiple copies can be stored in a flat folded state, and when in use, a three-dimensional boat-shaped storage space can be stably secured. According to the second technical feature of the present invention, the holding state between the outer body portion and the reinforcing body portion that constitute the side periphery of the boat-shaped container can be made stronger than in an embodiment that does not use a cover fold portion as a holding portion. According to the third technical feature of the present invention, the holding state between the outer body portion and the reinforcing body portion that constitute the side periphery of the boat-shaped container can be made stronger than in the embodiment in which the first holding portion or the second holding portion is used as the holding portion. According to the fourth technical feature of the present invention, the container can be immediately used as tableware in an emergency. According to the fifth technical feature of the present invention, a boat-shaped container body extending in the longitudinal direction can be easily constructed. According to the sixth technical feature of the present invention, it is easier to fold the V-shaped fold based on the diagonal fold compared to when the V-shaped fold is formed non-parallel to the diagonal fold, making it easier to make a boat-shaped container. According to the seventh technical feature of the present invention, the shape of the flattened container body when not in use and its stackable storage properties can be maintained in good condition compared to when this configuration is not provided, and the depth of the container body when in use can be ensured. According to the eighth technical feature of the present invention, the boat-shaped container has a symmetrical shape, making it easier to store the boat-shaped container when folded and to arrange it when in use, compared to when the container body has an asymmetrical shape with respect to the center line passing through the center of the symmetrical center line fold. According to a ninth technical feature of the present invention, a plurality of folding boat-shaped containers can be positioned and stored in a compact folded state. According to a tenth technical feature of the present invention, a foldable boat-shaped container that is easy to store and has excellent usability as a container can be easily made from a single rectangular sheet material. [Brief explanation of the drawings]

[0009] [Figure 1] (a) is an explanatory diagram showing an overview of an embodiment of a sheet material used to fold and produce a foldable boat-shaped container to which the present invention is applied, and (b) is an explanatory diagram showing the use of the foldable boat-shaped container shown in (a). [Figure 2] 1 is an explanatory diagram showing an example of the configuration of a sheet material that is folded to produce a foldable boat-shaped container according to embodiment 1. FIG. [Figure 3]3(a) is an explanatory diagram showing a pair of diagonal folds in the sheet material shown in FIG. 2, (b) is an explanatory diagram showing a symmetrical center line fold in the sheet material, and (c) is an explanatory diagram showing a pair of symmetrical parallel line folds in the sheet material. [Figure 4] 2A is an explanatory diagram showing an example of the configuration of the boundary between the bottom and the side periphery and the retaining portion on the left half side of the sheet material shown in FIG. 2; and FIG. 2B is an explanatory diagram showing an example of the configuration of the boundary between the bottom and the side periphery and the retaining portion on the right half side of the sheet material shown in FIG. 2. [Figure 5] 1 is an explanatory diagram showing a method for first producing the basic shape of a foldable boat-shaped container from the sheet material according to the first embodiment. FIG. [Figure 6] 1 is an explanatory diagram showing the basic shape of a foldable boat-shaped container according to embodiment 1, viewed from the front side. FIG. [Figure 7] 10(a) to 10(e) are explanatory diagrams showing examples of a first holding structure on both longitudinal sides of the container body of the basic type of foldable boat-shaped container. [Figure 8] FIG. 10 is an explanatory diagram showing the front side of the foldable boat-shaped container with the first holding structure completed. [Figure 9] 4A and 4B are explanatory diagrams showing examples of second holding structures on both longitudinal sides of the container body of the foldable boat-shaped container according to the first embodiment. [Figure 10] (a) is an explanatory diagram of the folded state of the foldable boat-shaped container of embodiment 1 as seen from the front side, (b) is an arrow view as seen from the direction B in (a), and (c) is a cross-sectional explanatory diagram cut along line CC in (a). [Figure 11] 1 is an explanatory diagram showing an example of a method for storing the foldable boat-shaped container according to embodiment 1 when not in use. FIG. [Figure 12] 1(a) is an explanatory diagram showing the use state of the foldable boat-shaped container according to the first embodiment, and FIG. 1(b) is a view seen from the direction of the arrow B in FIG. [Figure 13] 10(a) to 10(f) are explanatory diagrams showing examples of the holding structure on both longitudinal sides of the container body of the basic type of the foldable boat-shaped container according to the first modified embodiment. [Figure 14](a) is an explanatory diagram of the state of a foldable boat-shaped container relating to modified form 2, viewed from the front, before the holding structure on both longitudinal sides of the container body is completed, and (b) is an explanatory diagram of the state of the state of the holding structure on both longitudinal sides of the container body shown in (a), viewed from the front. DETAILED DESCRIPTION OF THE INVENTION

[0010] Overview of the implementation form FIG. 1(a) shows an outline of an embodiment of a sheet material to be folded to produce a foldable boat-shaped container to which the present invention is applied. In the figure, the foldable boat-shaped container 1 has basic folds including a pair of diagonal folds L1 folded along diagonals, a symmetrical centerline fold L2 that symmetrically folds the sheet material S through the center of the diagonal fold L1, a pair of symmetrical parallel folds L3 that fold the sheet material S in parallel along symmetrical positions sandwiching the symmetrical centerline fold L2, and a V-shaped fold L4 that extends in a V shape from four intersections of the pair of diagonal folds L1 and the pair of symmetrical parallel folds L3 to the symmetrical centerline fold L2 outside the rectangular area surrounded by the four intersections. The container body 2 is made up of a bottom 3 of a hexagonal area surrounded by the pair of symmetrical parallel folds L3 and the V-shaped fold L4, and a side periphery 4 that surrounds the periphery of the bottom 3. The bottom 3 can be folded into a mountain fold at the symmetrical centerline fold L2. The container body 2 has a single-piece outer body portion 4a that is located on the bottom 3 facing the symmetrical parallel fold L3 and forms the outer shape of the container body, a reinforcing body portion 4b that is located on the bottom 3 facing the V-shaped fold L4 and that reinforces the longitudinal regions of the outer body portion 4a, and a retaining portion 4c that folds and retains a portion of the reinforcing body portion 4b that protrudes from the outer body portion 4a over the longitudinal opening edges of the outer body portion 4a on both sides.The container body 2 can be transformed into a first shape when not in use, which is a flattened shape formed by folding the bottom 3 in a mountain fold along the symmetrical centerline fold L2 and folding the side periphery portions 4 so as to sandwich the folded bottom 3 therebetween, and a second shape when in use (see Figure 1(b)) in which the folded bottom 3 is unfolded and the bottom 3 and the side periphery portions 4 form a boat-shaped storage space portion 5.

[0011] In such technical means, the rectangular shape mainly refers to a rectangular shape, but is not limited to a rectangular shape and also includes a square shape. Furthermore, the sheet material S is not limited to a paper material, and a paper material containing synthetic resin or a synthetic resin material may also be used as long as it can be folded along the fold. Furthermore, the sheet material S may have at least a pair of diagonal folds L1, a symmetrical centerline fold L2, a pair of symmetrical parallel folds L3, and a V-shaped fold L4 as basic folds. The sheet material S may also have other folds in advance. Furthermore, one sheet material S constitutes the container body 2 by a bottom portion 3 of a hexagonal region and a side peripheral portion 4 surrounding the bottom portion 3. The bottom 3 only needs to be foldable into a mountain fold along the symmetrical centerline fold L2, making it possible to store multiple foldable boat-shaped containers 1 by positioning and stacking the mountain-folded bottoms 3. The side periphery 4 may include a single-piece outer body portion 4a, a reinforcing body portion 4b having a multi-layered structure, and a retaining portion 4c that holds a portion of the reinforcing body portion 4b at the opening edge on both longitudinal sides of the outer body portion 4a. Here, the reinforcing body portion 4b has a multi-layered structure, but it is not necessary for all of the reinforcing body portion 4b to have a multi-layered structure; it may also have a single-piece structure partially present. The multi-layered reinforcing body portion 4b and the retaining portion 4c are often symmetrical on both longitudinal sides of the outer body portion 4a, but they may also have asymmetrical shapes. For example, the retaining portion 4c may have a different configuration, such as a folding position of the portion held by a portion of the reinforcing body portion 4b. The reinforcing body portions 4b may be provided on the inside of both longitudinal sides of the outer body portion 4a, but this is not limited thereto; they may also be provided on the outside. Furthermore, the container body 2 must be capable of being transformed into a first shape when not in use and a second shape when in use. Incidentally, preferred aspects of the foldable boat-shaped container 1 of this example will be described in detail in the embodiment.

[0012] Next, a method for producing the foldable boat-shaped container 1 of this example will be described. When making a foldable boat-shaped container 1 from a single rectangular sheet material S, the process includes a basic fold making step of folding the sheet material S along the diagonal lines as basic folds, a pair of diagonal folds L1, a symmetrical centerline fold L2 that symmetrically folds the sheet material S through the center of the diagonal fold L1, a pair of symmetrical parallel folds L3 that fold parallel to symmetrical positions sandwiching the symmetrical centerline fold L2, and a V-shaped fold L4 that extends in a V shape from four intersections of the pair of diagonal folds L1 and the pair of symmetrical parallel folds L3 to the symmetrical centerline fold L2 outside the rectangular area surrounded by the four intersections, a first folding step of folding the bottom 3 of the hexagonal area surrounded by the pair of symmetrical parallel folds L3 and the V-shaped fold L4 made in the basic fold making step into a mountain fold at the symmetrical centerline fold L2 as a boundary, and a second folding step of folding the bottom 3 of the hexagonal area surrounded by the pair of symmetrical parallel folds L3 and the V-shaped fold L4 made in the basic fold making step into a mountain fold at the symmetrical centerline fold L2 as a boundary after the first folding step. and a second folding step of folding the folded bottom 3 in the side periphery 4 region surrounding the periphery of the bottom 3 of the sheet material S, wherein the second folding step includes the steps of folding a single-piece outer body 4a formed by valley-folding the region facing a pair of symmetrical parallel folds L3 to form an outer shape, folding a reinforcing body 4b formed by multiple layers that reinforces the regions on both longitudinal sides of the outer body 4a by valley-folding the region facing the V-shaped fold L4, and folding retaining portions 4c that fold and retain portions of the reinforcing body 4b protruding from the outer body 4a onto the opening edges on both longitudinal sides of the outer body 4a. The container body 2, which is made up of the bottom 3 and the side periphery 4, can be deformed into a first flat shape and a second shape in which the folded bottom 3 is expanded to form a boat-shaped storage space 5 between the bottom 3 and the side periphery 4. This example includes a basic fold making step, a first folding step, and a second folding step when making a foldable boat-shaped container 1 from a single sheet material S. In this case, when making the foldable boat-shaped container 1 manually, each step may be realized by an automatic manufacturing device, or the container may be made by a manufacturing device that includes some manual labor.

[0013] The present invention will be described in more detail below based on the embodiments shown in the accompanying drawings. Embodiment 1 FIG. 2 shows an example of the structure of a sheet material that is folded to produce the foldable boat-shaped container according to the first embodiment. -Sheet material- In the figure, the sheet material S is rectangular, which is one embodiment of a rectangular shape. While the sheet material S may be selected as appropriate, in this example, at least the inner surface of the container body 2 is made of a material with excellent water resistance. As this type of sheet material S, synthetic paper such as YUPO (registered trademark), which is synthesized primarily from polypropylene resin, polyethylene resin, or polypropylene resin, or an environmentally friendly material incorporating recycled paper biomass fibers, is preferred. In this example, YUPO synthetic paper is used. The size of the sheet material S can be selected appropriately based on the desired size of the foldable boat-shaped container 1. For example, it can be selected from tabloid size (273 mm x 406 mm), JIS standard A4 size, B4 size, A3 size, etc., depending on the intended use. The thickness of the sheet material S can be selected as appropriate, but a thickness of 150 μm or less is preferred to ensure a stable folded state.

[0014] -Basic fold- In this embodiment, the foldable boat-shaped container 1 is made of a single rectangular sheet material S with a plurality of basic folds. As shown in Figures 2 to 4, the basic folds include a pair of diagonal folds L1 (see Figure 3(a)) that fold along diagonals, a symmetrical centerline fold L2 (see Figure 3(b)) that folds the sheet material S symmetrically through the center of the diagonal fold L1, a pair of symmetrical parallel folds L3 (see Figure 3(c)) that fold parallel to each other along symmetrical positions sandwiching the symmetrical centerline fold L2, and a V-shaped fold L4 (see Figures 4(a) and 4(b)) that extends in a V shape from the four intersections of the pair of diagonal folds L1 and the pair of symmetrical parallel folds L3 to the symmetrical centerline fold L2 outside the rectangular area surrounded by the four intersections.

[0015] In this example, the symmetrical center line fold L2 extends parallel to the long side of the rectangular sheet material S. Therefore, in this example, it is possible to construct a container body 2 that extends in the long side direction using the rectangular sheet material S. In this example, the pair of symmetrical parallel folds L3 are provided at positions that divide the short side of the sheet material S into thirds. If the distance between the pair of symmetrical parallel folds L3 and the symmetrical center line fold L2 is d1, and the distance between the symmetrical parallel folds L3 and the long side of the sheet material S that is parallel to the symmetrical parallel folds L3 is d2, then in this example, the relationship 2×d1=d2 is satisfied. However, the position of the symmetrical parallel fold L3 is not limited to this and may be selected as appropriate. However, it is preferable that the position be selected so as to satisfy the relationship d2 / 3≦d1≦d2. The reason for this will be described later. Furthermore, although the shape of the V-shaped fold L4 can be selected as appropriate, in this example, the V-shaped fold L4 is formed parallel to each diagonal fold L1. In other words, in this example, when folding the V-shaped fold L4, the fold is made parallel using the pair of diagonal folds L1 as a guide, making it easy to fold the V-shaped fold L4.

[0016] -Example of container body configuration- In this example, the foldable boat-shaped container 1, as shown in Figure 2, comprises a bottom 3 of a hexagonal area surrounded by a pair of symmetrical parallel folds L3 and a V-shaped fold L4, and a side periphery 4 surrounding the periphery of the bottom 3, constituting the container body 2. Here, the bottom portion 3 can be folded into a mountain fold along the symmetrical center line fold L2. The side peripheral portion 4 is provided with an outer body portion 4a made of a single piece that is located at the portion of the bottom portion 3 facing the symmetrical parallel fold L3 and forms the outer shape, a reinforcing body portion 4b made of multiple layers that is located at the portion of the bottom portion 3 facing the V-shaped fold L4 and reinforces the areas on both sides of the outer body portion 4a in the longitudinal direction, and holding portions 4c (see Figures 4 and 7 to 9) that fold and hold parts of the reinforcing body portion 4b over the opening edges on both sides of the outer body portion 4a in the longitudinal direction.

[0017] -How to make a foldable boat-shaped container- In this example, when producing the foldable boat-shaped container 1, first the basic form of the foldable boat-shaped container 1 is produced, and then the basic form is held by the holding portion 4c. <Basic form of foldable boat-shaped container> In this example, the basic form of the foldable boat-shaped container 1 refers to the container body 2 in a state where it has not yet been completely held by the holding portion 4c (see FIG. 6). To create the basic shape of the foldable boat-shaped container 1, as shown in Figure 5, mountain fold creases (shown by dotted lines in the figure) or valley fold creases (shown by dotted lines in the figure) are made at predetermined locations on the basic fold of the sheet material S, for example by creasing, and the container body 2, which forms the basic shape of the foldable boat-shaped container 1, is then assembled from the sheet material S based on the creasing creases. In this example, the symmetrical center line fold L2 located within the bottom 3 area and the pair of symmetrical parallel line folds L3 located in areas other than the bottom 3 are referred to as mountain folds M, and the pair of symmetrical parallel line folds L3 surrounding the periphery of the bottom 3, the V-shaped fold L4, and the pair of diagonal line folds L1 located in areas other than the bottom 3 are referred to as valley folds V. In this state, when the sheet material S is folded over along the symmetrical center line fold L2, the basic shape of the foldable boat-shaped container 1 is obtained as shown in FIG. In this example, the basic shape of the foldable boat-shaped container 1 is such that reinforcing body sections 4b are arranged inside the longitudinally opposite regions of the outer body section 4a of the side periphery 4 of the container body 2. In this example, the reinforcing body sections 4b have two sets of double-layered structures, and reinforce the outer body section 4a located on the outside. However, not all of the reinforcing body sections 4b in this example have a double-layered structure, and some have a single-layer structure.

[0018] -Holding work by holding part- Once the basic shape of the foldable boat-shaped container 1 is obtained, the next step is to hold it using the holding portion 4c. In this example, the holding portion 4c has a double holding structure consisting of a first holding portion 41 and a second holding portion . The holding portions 4c in this example are provided on both longitudinal sides of the container body 2. Here, one longitudinal side of the container body 2 will be described as an example, and description of the holding portions 4c on the other side will be omitted. As shown in Figure 6, once the basic shape of the foldable boat-shaped container 1 is obtained, a portion of the reinforcing body portion 4b is positioned on one longitudinal side of the container body 2 so as to protrude above the opening edge of the outer body portion 4a. In this state, when one longitudinal side of the container body 2 is pulled in a direction intersecting the longitudinal direction and unfolded, it reaches the state shown in Figure 7(a). In Figure 7(a), on one longitudinal side of the container body 2, there is a rectangular first sheet portion S1 that includes the area of ​​the V-shaped fold L4 of the bottom 3, a triangular second sheet portion S2 that is provided facing one side of the first sheet portion S1, and a third sheet portion S3 that is provided on the opposite side of the second sheet portion S2 with the first sheet portion S1 in between.

[0019] <Holding by the first holding part> The holding operation by the first holding portion 41 (holding portion 4c) is as follows. First, as shown in Figure 7(b), the second sheet portion S2 is folded in the direction of the arrow outside the first sheet portion S1, centered on a reference line m1 along the boundary between the first sheet portion S1 and the second sheet portion S2 (corresponding to one of the symmetrical parallel folds L3). Then, as shown in Figure 7(c), the third sheet portion S3 is folded in the direction of the arrow outside the second sheet portion S2, centered on a reference line m2 along the boundary between the first sheet portion S1 and the third sheet portion S3 (corresponding to the other symmetrical parallel fold L3). 7(d), the triangular region R of the third sheet portion S3, which protrudes above the opening edge of the outer body portion 4a of the second sheet portion S2, is folded inward of the opening edge of the outer body portion 4a, centered on a reference line m3 along the opening edge of the outer body portion 4a of the second sheet portion S2. In this state, the second sheet portion S2 and the third sheet portion S3 are stacked on the outside of the first sheet portion S1, and the third sheet portion S3 is held by the second sheet portion S2. Here, the triangular region R of the third sheet portion S3 includes a portion of the reinforcing body portion 4b, and therefore a portion of the reinforcing body portion 4b is folded into and held at the opening edge on one side of the longitudinal direction of the outer body portion 4a. Thereafter, as shown in Fig. 7(d), when one longitudinal side of the container body 2 is returned to its original flattened state around the reference line m4 along the symmetrical centerline fold L2, the state shown in Fig. 7(e) is reached, completing the holding state by the first holding portion 41 (holding portion 4c). Incidentally, the holding operation is also performed on the other side of the container body 2 in the longitudinal direction by the first holding portion 41 (holding portion 4c). FIG. 8 shows the container body 2 after the holding operation by the first holding portion 41 (holding portion 4c) has been completed.

[0020] <Holding by the second holding part> As shown in FIG. 8, when the holding operation by the first holding portion 41 is completed, a part of the reinforcing body portion 4b is arranged in a state where it protrudes upward beyond the opening edges on both longitudinal sides of the outer body portion 4a. In this state, the holding operation by the second holding portion 42 (holding portion 4c) is as follows. As shown in Figure 9, the second holding portion 42 is composed of a covering fold portion 43 that folds a part of the reinforcing body portion 4b that protrudes above the opening edge of the outer body portion 4a over the outside of the opening edges on both longitudinal sides of the outer body portion 4a. As a result, the side periphery 4 of the container body 2 has a double holding structure with the first holding portion 41 and the second holding portion 42, which firmly holds the reinforcing body portion 4b against the outer body portion 4a. In this example, the holding portion 4c has a double holding structure consisting of the first holding portion 41 and the second holding portion 42, so the holding structure by the holding portion 4c is stronger than when only one of the holding structures is adopted. In this example, in order to facilitate the holding operation by the holding portions 4c (first holding portion 41, second holding portion 42), creasing is performed in advance on the portions of the sheet material S that function as the holding portions 4c, as shown in Figures 2 and 4. However, it goes without saying that the holding portions 4c (first holding portion 41, second holding portion 42) may be newly folded during the holding operation even if they are not creasing in advance.

[0021] -Foldable boat-shaped container- FIG. 10(a) shows the container body 2 after the holding operation by the holding portion 4c (first holding portion 41, second holding portion 42) has been completed. <First shape> In this example, the container body 2 is deformable into a first shape as a shape when not in use. Here, the first shape is a flattened shape in which the bottom portion 3 is folded in a mountain fold along the symmetrical center line fold L2, and the side peripheral portion 4 is folded across the folded bottom portion 3, as shown in Figures 10(a) to (c). At this time, the bottom 3 of the container body 2 is folded in a mountain fold, so that an inverted V-shaped mountain fold groove 31 is formed on the lower surface of the bottom 3. In addition, the opening edges on both longitudinal sides of the container body 2 are doubly held by the holding portions 4c, so that the inverted V-shaped mountain-folded groove 31 is closed on both longitudinal sides, as shown in Figure 10(b).

[0022] In this way, the container body 2 transformed into the first shape has an inverted V-shaped mountain fold groove 31 in the bottom 3 that is folded mountain-like. Therefore, when storing multiple foldable boat-shaped containers 1 (e.g., 1a-1c), as shown in FIG. 11 , the mountain-folded bottom 3 of the lower foldable boat-shaped container 1 (e.g., 1b) transformed into the first shape is inserted into the mountain fold groove 31 of the upper foldable boat-shaped container 1 (e.g., 1c) transformed into the first shape, and multiple flattened foldable boat-shaped containers 1 are stacked in multiple layers. In this case, the foldable boat-shaped containers 1 arranged above and below are positioned by the fit of the mountain-shaped bottom 3 and the mountain fold groove 31. In this example, by optimally selecting the depth of the mountain fold groove 31, the upper foldable boat-shaped container 1 is approximately accommodated in the flat space within the container body 2 of the lower foldable boat-shaped container 1. Therefore, multiple foldable boat-shaped containers 1 can be stacked in multiple layers without increasing the vertical dimension, and multiple foldable boat-shaped containers 1 can be easily stored in a storage means such as a transparent bag.

[0023] <Second shape> In this example, the container body 2 is deformable into a second shape as the shape during use. Here, the second shape is a shape in which the bottom portion 3 is unfolded from its folded state, and the bottom portion 3 and the side peripheral portion 4 form a boat-shaped storage space portion 5, as shown in FIGS. 12(a) and 12(b). At this time, the outer body portion 4a and the reinforcing body portion 4b are held by the holding portions 4c on both longitudinal sides of the side periphery 4 of the container body 2. Therefore, even if the container body 2 is deformed into the second shape, there is no concern that the opening edges on both longitudinal sides of the container body 2 will tear. Therefore, in this example, when the foldable boat-shaped container 1 is transformed into the second shape, it can be used as a container for food or small items. In particular, in this example, the sheet material S that constitutes the container body 2 is made of a highly water-resistant material, so it can also be used as tableware for holding liquids such as water. In this case, strong pressure from the liquid, such as water, acts on the opening edges on both longitudinal sides of the container body 2. However, because the opening edges on both longitudinal sides of the container body 2 are firmly held by a double holding structure using the holding portions 4c, there is no risk of liquids, such as water, leaking from the opening edges on both longitudinal sides of the container body 2. Furthermore, if a smooth material is used as the sheet material S, and printing or the like is applied to the sheet material S in advance, it is possible to produce a foldable boat-shaped container 1 with excellent design.

[0024] -Symmetry of the shape of the side periphery- In this example, the outer body portion 4a, the reinforcing body portion 4b, and the holding portion 4c that constitute the side peripheral portion 4 are symmetrical with respect to the intersecting center line that passes through the center of the symmetrical center line fold L2. Therefore, since the foldable boat-shaped container 1 has a symmetrical shape, storage of the foldable boat-shaped container 1 in the first shape and arrangement of the foldable boat-shaped container 1 in the second shape are easier than when the container body 2 has an asymmetrical shape with respect to the center line passing through the center of the symmetrical center line fold L2.

[0025] -Relationship between the area of ​​the base and the height of the side circumference- In this example, as described above, d1 (the distance between a pair of symmetrical parallel folds L3 and the symmetrical center line fold L2) and d2 (the distance between the symmetrical parallel fold L3 and the long side of the sheet material S parallel to the symmetrical parallel fold L3) satisfy the relationship "d2 / 3≦d1≦d2" (see Figure 2). This indicates a preferable relationship between the area of ​​the bottom portion 3 and the height of the side periphery portion 4. If d1>d2, there is a concern that in the first shape, the folded bottom portion 3 may protrude from the opening of the side peripheral portion 4. Furthermore, if d2 / 3>d1, there is a concern that the area of ​​the bottom portion 3 may become smaller, making it difficult to stably maintain the second shape.

[0026] ◎Transformation form 1 In this embodiment, the retaining portion 4c employs a double retaining structure consisting of a first retaining portion 41 and a second retaining portion 42, but this is not limited to this and any suitable structure may be selected as long as it holds a portion of the reinforcing body portion 4b against the outer body portion 4a. 13(a) to 13(f) show a holding structure using a holding part for a foldable boat-shaped container according to a first modified embodiment. In this example, unlike the first embodiment, the holding portion 4c does not employ the first holding portion 41, but employs a covering folding portion 43 corresponding to the second holding portion . 13(a) to 13(d), instead of the first holding portion 41, the second sheet portion S2 is folded around the reference line m1 to the outside of the first sheet portion S1 of the basic shape of the foldable boat-shaped container 1, and then the third sheet portion S3 is folded around the reference line m2 to the outside of the second sheet portion S2. Therefore, in this example, the second sheet portion S2 and the third sheet portion S3 are embraced by the first sheet portion S1 on both longitudinal sides of the basic shape of the container body 2, but are not yet held in place. In this state, as shown in Figure 13(d), if the expanded state of one side of the longitudinal direction of the container body 2 is returned to its original flattened state around the reference line m4 along the symmetrical center line fold L2, it will reach the state shown in Figure 13(e). In FIG. 13(e), a part of the reinforcing body portion 4b is disposed so as to protrude upward beyond the opening edges on both sides in the longitudinal direction of the outer body portion 4a. For this reason, in this example, as shown in Figure 13(f), a covering folding portion 43 is used as the retaining portion 4c, which folds a part of the reinforcing body portion 4b that protrudes above the opening edge of the outer body portion 4a over the outside of the opening edges on both longitudinal sides of the outer body portion 4a. As a result, the side periphery 4 of the container body 2 has a holding structure formed by the folded covering portion 43, and holds the reinforcing body portion 4b against the outer body portion 4a. The method of processing the first sheet portion S1 to the third sheet portion S3 is not limited to the embodiment in this example, and may be selected as appropriate.

[0027] ◎Transformation form 2 In the first embodiment, the reinforcing body portions 4b located on both sides of the container body 2 in the longitudinal direction are arranged inside the outer body portion 4a, but this is not limited to this and may be selected as appropriate. 14(a) and 14(b) show a foldable boat-shaped container according to the second modified embodiment. In the figure, when producing the basic container body 2 of the foldable boat-shaped container 1, a reinforcing body portion 4b is placed inside the outer body portion 4a on one of the longitudinal sides of the container body 2 (the right side in the figure), and a double holding structure is adopted with holding portions 4c (first holding portion 41, second holding portion 42) similar to those in embodiment 1. In contrast, on the other longitudinal side of the container body 2 (the left side in the figure), a reinforcing body portion 4b is placed outside the outer body portion 4a, and as the holding portion 4c, a cover folding portion 44 is adopted, which folds a portion of the reinforcing body portion 4b that protrudes above the outer body portion 4a over the inside of the opening edge of the outer body portion 4a. Thus, in modified form 2, the reinforcing body portion 4b located on the other of both longitudinal sides of the container body 2 has a different configuration from that of embodiment 1, and the corresponding holding portion 4c is also different from that of embodiment 1, but like embodiment 1, it can be deformed into the first shape and the second shape. In modified form 2, the reinforcing body portion 4b located on one of both longitudinal sides of the container body 2 has the same configuration as in embodiment 1, and a holding portion 4c similar to that in embodiment 1 is used, but this is not limited to this and it goes without saying that the design may be modified as appropriate. [Industrial Applicability]

[0028] The foldable boat-shaped container of the present invention can be transformed into a flat first shape when not in use and a second shape that provides a boat-shaped storage space when in use. Therefore, it can be carried and stored in the first shape, and can be used as a container for food and drink in the second shape. Therefore, the foldable boat-shaped container of the present invention can be industrially used for the following purposes, for example: Disaster prevention supplies: Store in the first shape when not in use, and transform into the second shape when used in an emergency. Camping and other outdoor equipment Fancy items, such as cosmetic items, easy-to-use facial soft cases, etc. - Can be used as a desktop mini case to store all kinds of irregularly shaped items · Add your own original design and use it as a decorative item - As a school teaching material, for example, using origami paper materials for elementary school students, creating original designs, etc. Expanded use areas for newspapers, flyers, etc. · Effective for SDGs. Uses tear-resistant, water-resistant, smooth and beautiful materials or environmentally friendly materials incorporating recycled paper biomass fibers. [Explanation of symbols]

[0029] 1...Foldable boat-shaped container, 2...Container body, 3...Bottom, 4...Side periphery, 4a...External body, 4b...Reinforced body, 4c...Retaining portion, 5...Storage space, L1...Diagonal fold, L2...Symmetrical center line fold, L3...Symmetrical parallel line fold, L4...V-shaped fold, S...Sheet material

Claims

1. A rectangular sheet material has basic folds including a pair of diagonal folds along diagonals, a symmetrical centerline fold that folds the sheet material symmetrically through the center of the diagonal folds, a pair of symmetrical parallel folds that fold the sheet material in parallel along symmetrical positions sandwiching the symmetrical centerline fold, and V-shaped folds that extend in a V shape from four intersections of the pair of diagonal folds and the pair of symmetrical parallel folds to the symmetrical centerline fold outside a rectangular area surrounded by the four intersections, a container body including a bottom portion of a hexagonal region surrounded by the pair of symmetrical parallel folds and the V-shaped fold, and a side periphery surrounding the periphery of the bottom portion; The bottom portion can be folded into a mountain fold along the symmetrical center line fold, The side peripheral portion has an outer body portion made of one piece and provided at a portion of the bottom facing the symmetrical parallel fold to form an outer shape, a reinforcing body portion made of multiple layers and provided at a portion of the bottom facing the V-shaped fold to reinforce regions on both sides of the outer body portion in the longitudinal direction, and a holding portion that folds and holds a portion of the reinforcing body portion protruding from the outer body portion into an opening edge on both sides of the outer body portion in the longitudinal direction, The container body has a flat first shape when not in use, in which the bottom portion is folded in a mountain fold along the symmetrical center line fold and the side periphery is folded across the folded bottom portion; A foldable boat-shaped container characterized in that, when in use, it can be deformed into a second shape in which the folded state of the bottom is expanded and the bottom and the side peripheral portion create a boat-shaped storage space.

2. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that the holding portion includes a covering folding portion that folds a portion of the reinforcing body portion protruding from the outer body portion over the opening edges on both longitudinal sides of the outer body portion.

3. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that the holding portion has a first holding portion that folds and holds a portion of the reinforcing body portion protruding from the outer body portion inside the opening edges on both longitudinal sides of the outer body portion, and a second holding portion that folds and holds the portion outside the opening edges.

4. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that the sheet material is made of a material with excellent water resistance, at least on the inner surface of the container body.

5. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container, characterized in that the sheet material is rectangular and the symmetrical center line fold extends parallel to the long sides of the sheet material.

6. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that the V-shaped fold is formed parallel to one of the diagonal folds.

7. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that, when the distance between the symmetrical parallel line fold and the symmetrical center line fold is d1 and the distance between the symmetrical parallel line fold and the edge of the sheet material parallel to the symmetrical parallel line fold is d2, d2 / 3≦d1≦d2.

8. The collapsible boat-shaped container according to claim 1, A foldable boat-shaped container characterized in that the outer body portion, the reinforcing body portion, and the retaining portion that constitute the side peripheral portion are symmetrical with respect to an intersecting center line that passes through the center of the symmetrical center line fold.

9. When storing a plurality of the foldable boat-shaped containers according to claim 1 in the first shape, A foldable boat-shaped container characterized in that the mountain-folded bottom of the container body constituting one foldable boat-shaped container is sandwiched between the mountain-folded grooves on the bottom of the container body constituting another foldable boat-shaped container, and the containers are positioned and stacked.

10. When making a foldable boat-shaped container from a single rectangular sheet material, a basic fold making process for folding the sheet material along basic folds, including a pair of diagonal folds along diagonals, a symmetrical centerline fold that folds the sheet material symmetrically through the center of the diagonal folds, a pair of symmetrical parallel folds that fold the sheet material parallel to symmetrical positions sandwiching the symmetrical centerline fold, and a V-shaped fold that extends in a V shape from four intersections of the pair of diagonal folds and the pair of symmetrical parallel folds to the symmetrical centerline fold outside a rectangular area surrounded by the four intersections; a first folding step of folding a bottom portion of a hexagonal region surrounded by the pair of symmetrical parallel folds and the V-shaped fold, which are made in the basic fold making step, into a mountain fold with the symmetrical center line fold as a boundary; a second folding step of folding a side peripheral region surrounding a peripheral edge of the bottom portion of the sheet material after the first folding step, sandwiching the folded bottom portion; Equipped with the second folding step includes the steps of: folding a one-piece outer body portion having an outer shape formed by valley-folding an area facing the pair of symmetrical parallel folds; folding a reinforcing body portion having a multi-layer structure that reinforces areas on both longitudinal sides of the outer body portion by valley-folding an area facing the V-shaped folds; and folding a retaining portion that folds and retains a portion of the reinforcing body portion protruding from the outer body portion onto an opening edge on both longitudinal sides of the outer body portion, A method for manufacturing a foldable boat-shaped container, characterized in that the container body consisting of the bottom and the side periphery can be deformed into a flat first shape and a second shape in which the folded state of the bottom is expanded and a boat-shaped storage space is created between the bottom and the side periphery.

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