JP3235256U - Solar cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable solar cooker which can be folded small and can be usefully used even when it is not used as a solar cooker. SOLUTION: The solar cooker 1 can be assembled by folding one sheet, and is connected to a rectangular bottom surface 10 and each side of the peripheral edge of the bottom surface via a valley fold line in the developed view of the sheet. The side surfaces 20, 30 and 40 are provided with connection surfaces 50 and 60 whose ends are connected to each other via a fold line between the side surfaces adjacent to each other, and each of the connection surfaces has a bottom surface. The notch 70 and / or the folding line 120, 130 extending from the vicinity of each corner portion 210, 220 to the peripheral edge and at least one of the side surfaces are folded so that the bottom surface and the respective side surface are perpendicular to each other. Further provided with gusset folding lines 110, 140, 150 capable of flatly folding the rectangular parallelepiped when formed into a rectangular parallelepiped shape having an opening on the surface. [Selection diagram] Fig. 1

Description

The present invention relates to a solar cooker, and particularly to a solar cooker to be assembled and used.

In developing countries where the development of infrastructure is delayed due to disasters, and in camping, etc., a cooker using sunlight called a solar cooker is often used. The solar cooker is provided with a metal plate, a metal foil, a resin having a metal vapor deposition film, or the like on the surface exposed to sunlight, and is used in a shape in which the whole is recessed so as to efficiently collect sunlight. These solar cookers are generally about the size of an umbrella to collect the sunlight required for cooking, and are often foldable for carrying and storing because they are bulky. For example, Patent Document 1 discloses a type of solar cooker that is normally folded and unfolded and assembled when used.

Actual climb 3176656

However, the solar cooker described in the above document can only be folded and stored, and there is no useful usage other than when using the solar cooker, and it becomes a baggage when it is stored or carried. Will end up.
Therefore, it is an object of the present invention to provide a foldable solar cooker that can be folded into a small size and can be usefully used even when it is not used as a solar cooker.

The solar cooker of the present invention can be assembled by folding one sheet. In the developed view of the sheet, between the rectangular bottom surface, the side surface connected to each side of the peripheral edge of the bottom surface via a valley fold line, and the adjacent side surfaces, the edges of the adjacent side surfaces are adjacent to each other. Each of the connecting surfaces has a notch and / or a fold line extending in the peripheral direction from the vicinity of each corner of the bottom surface, and a pair of the side surfaces facing each other. Further, the bottom surface is further provided with a gusset folding line capable of flatly folding the rectangular parallelepiped when the bottom surface and the respective side surfaces are folded so as to be perpendicular to each other and formed into a rectangular parallelepiped shape having an opening on the top surface.

With the above configuration, the solar cooker of the present invention gently folds the valley fold line connecting the bottom surface and each side surface to form a single sheet, and the side surface adjacent to each connection surface is formed. By gently folding each of the fold lines that are connected to each other, and fixing the cuts on each connection surface so that the cuts are closed, and in the case of fold lines, the whole is folded. It has a concave shape and can be used as a solar cooker. Furthermore, the fold line that folds each side so that the bottom surface and each side surface are vertical, and connects the side surfaces adjacent to each connection surface so that the adjacent side surfaces are vertical is also a valley fold. Alternatively, by folding it into a mountain fold, it becomes a rectangular parallelepiped shape with an opening in a part, and small items such as foodstuffs and cooking utensils can be accommodated. Further, from here, the pair of facing side surfaces and the gusset folding line provided on the bottom surface make it possible to fold the rectangular parallelepiped flat and easily carry it without being bulky.
That is, although the solar cooker of the present invention has a simple structure composed of one sheet, it can be folded and assembled so that it can be used as a solar cooker, and it is also used as a storage case when storing or storing. It can also be folded into small pieces when not in use. Therefore, the solar cooker of the present invention can be folded into a small size and can be usefully used even when it is not used as a solar cooker.

It is a schematic diagram which shows the development view of the solar cooker which concerns on embodiment. It is a schematic diagram which shows the cross section of the solar cooker which concerns on embodiment. It is a schematic diagram which shows the example of the holding part of the solar cooker which concerns on embodiment. It is a schematic diagram which shows an example of the assembly shape which can be used for the solar cooking of the solar cooker which concerns on embodiment. It is a schematic diagram which shows the assembly shape which can be used as the storage case of the solar cooker which concerns on embodiment. It is a schematic diagram which shows the shape of the solar cooker which concerns on embodiment when it is folded small. It is a schematic diagram in which the installation member is provided in the solar cooker which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the invention, its applications or its uses. In the following drawings, for the sake of brevity, components having substantially the same function are indicated by the same reference numerals.

The solar cooker of the present invention is configured so that it can be assembled by folding one sheet. In the developed view of the sheet, between the rectangular bottom surface, the side surface connected to each side of the peripheral edge of the bottom surface via a valley fold line, and the adjacent side surfaces, the edges of the adjacent side surfaces are adjacent to each other. Each of the connecting surfaces has a notch and / or a fold line extending in the peripheral direction from the vicinity of each corner of the bottom surface, and a pair of the side surfaces facing each other. The bottom surface is further provided with a gusset folding line capable of flatly folding the rectangular parallelepiped when the bottom surface and the respective side surfaces are folded so as to be perpendicular to each other and formed into a rectangular parallelepiped shape having an opening on the top surface.

The notch is preferably wedge-shaped in a plan view, which tapers from one end of the peripheral edge of the connecting surface toward the corner of the bottom surface.

The folding line provided on the connecting surface is preferably composed of a first folding line for mountain folding and a second folding line for valley folding.

The sheet preferably has a reflective layer on at least one surface and a substrate layer made of paper and / or synthetic resin on the other surface.

It is preferable that the length of one side of the bottom surface is 20 cm or more and 60 cm or less, and the length of the end sides of the adjacent side surfaces is 20 cm or more and 60 cm or less.

It is preferable that the connecting surface is provided with a holding portion for holding a state in which the bottom surface and the side surface, and the side surface and the connecting surface have a certain angle.

It is preferable that the side surface is provided with at least one handle.
(Embodiment 1)
Hereinafter, each configuration will be described in detail with reference to FIGS. 1 to 7 as appropriate.
<Development of solar cooker>

FIG. 1 is a schematic diagram showing a development view of a solar cooker according to the present embodiment. In the following description, each surface corresponding to the plan view of the developed view is referred to as a front surface, and the back surface is referred to as a back surface.
The solar cooker 1 is configured so that one sheet can be folded and assembled. In the developed view of the sheet, the rectangular bottom surface 10, the side surfaces 20, 30, 40 connected to each side of the peripheral edge of the bottom surface 10 via a valley fold line, and the adjacent side surfaces (20, 30, 40), respectively. In between, the ends of adjacent side surfaces (20, 30, 40) are provided with connection surfaces 50, 60 connected via a folding line, and each connection surface 50, 60 has a corner of a bottom surface 10. The bottom surface 10 and the respective side surfaces 20, 30, 40 are perpendicular to at least one of the notches 70 and / or the folding lines 120, 130 extending from the vicinity of the portions 210, 220 to the peripheral edge and the side surfaces (20, 30, 40). It is further provided with gusset folding lines 110, 140, 150 capable of flatly folding the rectangular parallelepiped when the rectangular parallelepiped is formed into a rectangular parallelepiped shape having an opening on the top surface.
That is, the bottom surface 10, the side surfaces 20, 30, 40, and the connecting surfaces 50, 60 are connected to one sheet, and the entire sheet has a substantially rectangular shape with a notch.
FIG. 1 shows an aspect in which a notch 70 is formed in the connection surface 50 and the folding lines 120 and 130 are formed in the connection surface 60, but even if all the connection surfaces 50 and 60 are provided with the notch, the connection is made. Folding lines may be provided on all of the surfaces 50 and 60, and the combination of the notch and the folding line is not limited to the combination. It is preferable to combine a pair of notches and a pair of folding lines because the solar cooker can be assembled into a shape that efficiently collects sunlight.

Further, the notch 70 is preferably wedge-shaped in a plan view, which tapers from one end of the peripheral edge of the connecting surface 50 toward the corner portion 210 on the bottom surface. As a result, the connection surface 50 is divided by the notch 70, and when the pair of sides forming the notch 70 of the connection surface 50 are assembled close to each other and used as a solar cooker, or when the bottom surface 10 and each side surface are used as a solar cooker. When the divided connection surfaces 50 are folded to form a rectangular parallelepiped shape having an opening on the top surface while folding so that the 20th, 30th, and 40th are perpendicular to each other, or when the gusset folding line is further formed from the rectangular parallelepiped shape. When the rectangular parallelepipeds are folded flat by folding the 110, 140, and 150, the collision is reduced and the rectangular parallelepiped can be assembled smoothly.
It is preferable that the corner portion not adjacent to the outer peripheral side surface of the connection surface is cut out in a quadrangular shape because the bumping is further reduced and the assembly can be performed smoothly.
Similarly, when the first folding line 120 and the second folding line 130 of the connecting surface 60 are folded into a solar cooker, a box shape, and a small folded state, they are adjacent to the outer peripheral side surface of the connecting surface 60. It is preferable to provide a portion 80 in which the corner portion is cut out in a quadrangular shape so that the vicinity of the corner portion is not caught.

The folding line provided on the connecting surface 60 is preferably composed of a first folding line 120 for mountain folding and a second folding line 130 for valley folding. Of course, the first folding line 120 for valley folding and the second folding line 130 for mountain folding can also be used.
As a result, when used as a solar cooker, the first folding line 120 and the second folding line 130 can be folded into a recessed shape as a whole, that is, a bowl shape, without necessarily providing a notch in the connection surface 60. It can be shaped. Due to this shape, sunlight can be efficiently collected.

The shape shown in FIG. 1 is substantially rectangular as a whole, but if it is a longer rectangle, it can be a horizontally long solar cooker, a horizontally long rectangular parallelepiped shape, or a horizontally folded shape. Further, if it is a square, it can be a substantially square solar cooker, a cube shape, or a shape folded into a square. The bottom surface 10 is a rectangle, and the side surfaces 20, 30, and 40 are all rectangular in FIG. 1, but all the internal angles may be a quadrangle of 90 degrees, but each surface is for designability. It may be a rectangle having an angle in the range of 45 degrees to 120 degrees. Further, it may have a shape in which the corners are notched in a tapered shape or an R shape.
<Cross section of solar cooker material>

As shown in FIG. 2, it is preferable that the sheet constituting the solar cooker 1 is provided with a reflective layer 310 on at least one side thereof and a base material layer 330 made of paper and / or synthetic resin on the other side.
The reflective layer 310 reflects sunlight. The light reflected by the reflective layer 310 can be condensed to perform solar cooking. The reflective layer 310 is not particularly limited as long as it can reflect sunlight, and a resin provided with a metal foil and / or a metal vapor-deposited film can be preferably used. By providing a resin having a metal foil and / or a metal vapor-deposited film as a reflective layer, sunlight can be efficiently reflected.
As the metal foil, an aluminum foil and / or a copper foil can be preferably used, but it is preferable to use an aluminum foil from the viewpoint of light weight, workability, and high sunlight reflectivity. The composition of the aluminum foil is not limited, and known aluminum foil can be used. The thickness of the aluminum foil is also not limited, but is preferably 5 μm or more and 400 μm or less, and is preferably 5 μm or more and 50 μm or less in terms of weight reduction.
As the resin provided with the metal vapor deposition film, a resin having a vapor deposition film of one or more kinds of metals selected from the group consisting of aluminum, copper, zinc, silver and tin can be used. More preferably, from the viewpoint of high sunlight reflectivity, it is preferable to use a resin provided with an aluminum vapor-deposited film. The thickness of the thin-film aluminum film is not limited, but is preferably 10 nm or more and 500 nm or less. Further, the resin content used for the resin provided with the metal vapor deposition film is not particularly limited, but for example, PET (polyethylene terephthalate), PA (polyethylene), PP (polypropylene), PC (polystyrene), PE (polyethylene), PMMA ( One or more resins selected from the group consisting of polymethylmethacrylate), PS (polystyrene) and PVC (polyvinyl chloride) can be used.

In the present invention, the base material layer 330 imparts strength and tension (rigidity) to the sheet. The base material layer 330 is not particularly limited as long as it is a material composed of paper and / or synthetic resin, but is particularly one or more selected from the group consisting of paper corrugated cardboard, plastic corrugated cardboard, foamed plastic and resin plate. Substrate can be used.
As the paper corrugated cardboard, one layer of double-sided corrugated cardboard (A flute, B flute, C flute, E flute, F flute, or G flute), two-layer double-sided corrugated cardboard, and three-layer double-sided corrugated cardboard can be used. It is preferable to use A flute, B flute, and C flute in terms of light weight, strength, and cost.
Polypropylene resin and polycarbonate resin can be used for the plastic corrugated cardboard. Preferably, using a polypropylene resin makes it lightweight, inexpensive, and has good workability. The thickness of the resin is not limited, but is preferably 1 mm or more and 10 mm or less.
As the foamed plastic, polyethylene resin, polypropylene resin, ABS resin and the like can be used. Preferably, polypropylene resin is used, which is lightweight, strong, inexpensive, and has good workability. The thickness of the resin is not limited, but is preferably 1 mm or more and 10 mm or less.
As the resin plate, a polypropylene resin plate, a polycarbonate resin plate, a polyethylene terephthalate resin plate, or the like can be preferably used.
By having a paper base material such as corrugated cardboard, plastic corrugated cardboard, or foamed plastic or a resin base material on the back surface, it is lightweight, easy to fold, and has good shape retention. More preferably, plastic corrugated cardboard is preferable from the viewpoint of high strength against weight and light weight.
Further, the base material layer may be a single layer, but may be a plurality of layers in which a material selected from the group consisting of paper corrugated cardboard, plastic corrugated cardboard, foamed plastic and a resin plate is combined.

The reflective layer 310 and the base material layer 330 may be adhered by an adhesive layer. As the adhesive layer, one or more materials selected from the group consisting of an adhesive, an adhesive, a double-sided tape and a sealant film can be preferably used.
Adhesives include polyester resin, acrylic resin, urethane resin, vinyl acetate resin, epoxy resin, silicon resin, rubber, olefin resin, vinyl chloride resin, styrene-butadiene rubber resin and starch. One or more materials selected from the group consisting of can be used. It is preferable to use any one of polyester resin-based, acrylic resin-based and urethane resin-based materials because they have good heat resistance and are inexpensive. The thickness of the adhesive layer when the adhesive is used is not limited, but is preferably 0.5 μm or more and 10 μm or less.
As the pressure-sensitive adhesive, one or more materials selected from the group consisting of polyester resin-based, acrylic resin-based, urethane resin-based, silicon resin-based, rubber-based and styrene-butadiene rubber resin-based can be used. It is preferable to use any of polyester resin-based, acrylic resin-based and urethane resin-based because it has good heat resistance, is inexpensive, and can fill the step of the base material. Further, the thickness of the adhesive layer when the pressure-sensitive adhesive is used is not limited, but it is preferably 1 μm or more and 100 μm or less.
As the double-sided tape, one or more kinds of materials selected from the group consisting of an acrylic resin type, a rubber resin type and a silicon resin type can be used. Acrylic resin is preferable in terms of heat resistance and price. Further, the thickness of the adhesive layer when the double-sided tape is used is not limited, but is preferably 10 μm or more and 500 μm or less.
As the sealant film, polyester resin-based, acrylic resin-based, urethane resin-based, vinyl acetate resin-based, silicon resin-based, rubber-based, olefin resin-based, vinyl chloride resin-based, styrene-butadiene rubber resin-based, styrene resin-based, polyamide resin One or more sealant films selected from the group consisting of systems, ionomer resin systems and starch systems can be used. It is preferable to use any one of polyester resin-based, acrylic resin-based and urethane resin-based sealant films because they have good heat resistance and are inexpensive. The thickness of the adhesive layer when the sealant film is used is not limited, but is preferably 10 μm or more and 100 μm or less.
<Solar cooker size>

The size of the solar cooker is not particularly limited, but it is preferable that the length of one side of the bottom surface is 20 cm or more and 60 cm or less, and the length of the end sides of adjacent side surfaces is 20 cm or more and 60 cm or less. That is, it is preferable that the height from the bottom surface is 20 cm or more and 60 cm or less when molded into a rectangular parallelepiped shape.
With the above size, a sufficient amount of heat can be obtained in cooking by condensing sunlight, and even if it is box-shaped, it is not too large to be bulky, not too small to accommodate small items, and even if it is folded small. It can be a size that is easy to carry.
<Holding part>

FIG. 3 is a schematic diagram showing an example of a holding portion of a solar cooker. As shown in FIGS. 1 and 3, when the connection surface 50 is provided with a notch 70, the bottom surface 10 and the side surfaces 20, 40, and the side surfaces 20, 40 and the connection surface 50 have a constant angle on the connection surface 50. It is preferable to provide holding portions 52, 54 for holding the state. That is, when the pair of sides forming the notch 70 of the connecting surface 50 are assembled close to each other and used as a solar cooker, the holding portion 52 and the holding portion 54 are hooked to hold this shape. By being configured, the shape can be maintained without preparing a tape, a clip, or the like separately from the solar cooker.

As shown in FIGS. 1 and 3, when the connecting surface 60 is provided with the first folding line 120 and the second folding line 130, the connecting surface 60 includes a bottom surface 10, side surfaces 30, 40, and side surfaces 30, respectively. It is preferable to provide holding portions 62, 64 for holding a state in which the 40 and the connecting surface 60 have a constant angle. That is, when the first folding line 120 of the connecting surface 60 is folded into a mountain fold and the second folding line 130 is folded into a valley fold to be used as a solar cooker, the holding portions 62 and the holding portions 64 are respectively hooked. By being configured to hold this shape, the shape can be held without preparing a tape, a clip, or the like separately from the solar cooker.

FIG. 4 is a schematic diagram showing an assembled shape that can be used for solar cooking of the solar cooker according to the present embodiment. For example, in the developed view of the solar cooker 1 shown in FIG. 1, the valley fold line between the bottom surface 10 and the side surface 30 is, for example, about 95 to 110 degrees, and the valley fold line between the bottom surface 10 and the side surfaces 20 and 40 is, for example, about 120 degrees. It can be assembled in the state of FIG. 4 by making valley folds at various angles, folding the first folding line 120 in a mountain fold, folding the second folding line 130 in a valley fold, and overlapping a part of the divided connection surface 50. In FIG. 4, the holding portion 52 and the holding portion 54 (not shown because they are hidden behind the connection surface 50 in FIG. 4) and the holding portions 62 and 64 (not shown because they are hidden behind the connection surface 60 in FIG. 4). The shape is retained.

In the present invention, the holding portion is for holding the assembled shape, and the holding mechanism is not particularly limited, but can be selected from the group consisting of snap buttons, hook-and-loop fasteners, adhesive tapes, clips, magnets, screws and hooks. It is possible to use one kind or two or more kinds of holding members. From the viewpoint of durability, it is preferable to use a snap button.

FIG. 5 is a schematic view of the solar cooker according to the present embodiment assembled into a rectangular parallelepiped shape having an opening on the top surface. From the state of FIG. 4, while further folding the bottom surface 10 and the respective side surfaces 20, 30, 40 so as to be vertical, the connecting surface 50 having the holding portion 54 is folded so as to overlap the side surface 40, and then the holding portion 54 is folded. The connection surfaces 50 divided so that the back side of the connection surface 50 having the connection surface 50 and the back side of the connection surface 50 having the holding portion 52 overlap each other are folded. At the same time, the side on the side where the connection surface 60 of the side surface 40 is connected and the side on the side where the connection surface 60 of the side surface 30 is connected are brought into contact with each other, and the connection surface 60 is further brought into contact with the side along the first folding line 120. By folding it in a valley and folding it on the back side of the side surface 30, it can be assembled in the state shown in FIG. 5 (a).
In addition, another holding portion (not shown) may be provided on the connection surface 50, the connection surface 60, the side surface 40, etc. so that this shape is maintained.
Note that FIG. 5 shows a state in which the connecting surface 50 having the holding portion 52 and the connecting surface 50 having the holding portion 54 are overlapped and folded inside the rectangular parallelepiped shape. As shown in FIG. 6A, FIG. The connecting surface 50 having the holding portion 52 may be folded outside the rectangular parallelepiped shape, and the connecting surface 50 having the holding portion 54 may be folded inside the rectangular parallelepiped shape.
Similarly, in FIG. 5, the connecting surface 60 is folded to the back side of the side surface 30, that is, to the outside of the rectangular parallelepiped shape, but as shown in FIG. 6A, the connecting surface 60 is folded to the inside of the rectangular parallelepiped shape. But it may be.
Both can be assembled into a rectangular parallelepiped shape with an opening on the top surface.

Further, it is preferable that the side surfaces 20, 30 and 40 are provided with at least one handle.
FIG. 5B shows an aspect in which a pair of handles 100 are provided on the facing side surfaces 40.
By providing a handle near the midpoint on the opening side of the side surface 40, it can be easily carried. As a result, the rectangular parallelepiped solar cooker 1 with an opening on the top surface can be used like a handbag or shoulder bag, and can be easily carried with ingredients and cooking utensils (kitchen knives, gridiron, cutting board, etc.) stored inside. Is possible.
The material of the handle is not limited, but one or more known handle materials selected from the group consisting of a paper string, a resin string, a cotton string, a leather band, a paper band and a resin band can be used.
The length of the handle is not limited, but a material having a length of 15 cm or more and 80 cm or less for handheld use and 70 cm or 120 cm or less for shoulder hanging can be used.

FIG. 6 is a schematic view of a state in which the solar cooker according to the present embodiment is folded into a small size. By folding the gusset folding lines 110, 140, 150 (see FIG. 1) into the gusset folding lines from FIG. 6A, the gusset folding lines 110, 140, 140, are further crushed as shown in FIG. 6B. By folding the 150, it can be assembled in a flat state as shown in FIG. 6 (c). In addition, another holding portion (not shown) may be provided on the connection surface 50, the connection surface 60, the side surface 40, etc. so that this shape is maintained.

The holding portion 52 and the holding portion 54 are configured to be able to hold the shape in which one front surface and the other back surface of the divided surfaces in the same surface of the connection surface 50 are overlapped with each other. 64 can maintain the shape in which a part of the surface of the connection surface 60 is in contact with each other when the first folding line 120 is folded in a mountain fold and the second folding line 130 is folded in a valley fold. It is preferably configured. Here, the "divided surface in the same surface of the connecting surface 50" is referred to in FIG. 1, one of which is connected to the connecting surface 50 connected to the side surface 40 in the upper part of the drawing and the upper part of the side surface 20 in the drawing. The side surface 50, the other is the connection surface 50 connected to the side surface 40 at the lower side of the figure, and the side surface 50 connected to the lower side surface of the figure 20. That is, as shown in FIG. 4, a three-dimensional shape can be obtained by folding the connecting surfaces 50 divided by the notch 70 so as to reconnect them.
As a result, as shown in FIG. 4, it is possible to maintain a beautiful recessed shape with few irregularities as a whole.
<Other configurations>

The solar cooker of the present embodiment may be provided with an installation member for installing a cooking utensil on its surface. Specifically, by providing one or more kinds of members selected from the group consisting of felt, wood, rubber, paper, earthen material, and stone on the surface of the solar cooker, the solar cooker can be made by the cookware that has become hot. It can be prevented from being damaged.
The installation member may be of a size that does not interfere with the reflection of sunlight in the solar cooker. For example ^{, a member having a size of 0.5 cm 2} or more and 5 cm ² or less and a thickness of 0.1 cm or more and 2 cm or less is used. It is preferable to have about 10 to 10 pieces.
FIG. 7 is a schematic view of a state in which an installation member is provided on the solar cooker according to the present embodiment. Three felt-made installation members 90 are provided on the surface of the bottom surface 10 of the solar cooker 1. That is, it is used in a state where the back surface of the bottom surface 10 of the solar cooker 1 is installed on the ground, and the cooking utensil is installed on the installation member 90.
(Other embodiments)

The above-described embodiment is an example of the present invention, and the present invention is not limited to these examples, and well-known techniques, conventional techniques, and known techniques may be combined or partially replaced with these examples. The present invention also includes modifications that can be easily conceived by those skilled in the art.

1 Solar cooker 10 Bottom surface 20, 30, 40 Side surface 50, 60 Connection surface 52, 54, 62, 64 Holding part 70 Notch 80 Notched part 90 Installation member 100 Handle 110, 140, 150 Gazette folding line 120 First folding line 130 Second folding line 210, 220 Bottom corner 310 Reflective layer 330 Base material layer

Claims (7)

It is a solar cooker that can be assembled by folding one sheet.
In the developed view of the sheet,
The bottom of the rectangle and
The side surface connected to each side of the peripheral edge of the bottom surface via a valley fold line,
Between the adjacent side surfaces, a connecting surface is provided in which the ends of the adjacent side surfaces are connected to each other via a fold line.
Each of the connecting surfaces has a notch and / or a folding line extending from the vicinity of each corner of the bottom surface to the peripheral edge.
A gusset capable of flatly folding the rectangular parallelepiped when the pair of opposite side surfaces and the bottom surface are folded so that the bottom surface and the respective side surfaces are perpendicular to each other and formed into a rectangular parallelepiped shape having an opening on the top surface. A solar cooker with additional fold lines. The solar cooker according to claim 1, wherein the notch is a wedge shape in a plan view that tapers from one end of the peripheral edge of the connecting surface toward the corner of the bottom surface. The solar cooker according to claim 1 or 2, wherein the folding line provided on the connecting surface includes a first folding line for mountain folding and a second folding line for valley folding. The solar cooker according to any one of claims 1 to 3, wherein the sheet has an aluminum layer on at least one side thereof and a base material layer made of paper and / or a synthetic resin on the other side. The solar cooker according to any one of claims 1 to 4, wherein the length of one side of the bottom surface is 20 cm or more and 60 cm or less, and the length of the end sides of the adjacent side surfaces is 20 cm or more and 60 cm or less. The solar cooker according to any one of claims 1 to 5, wherein the connecting surface is provided with a holding portion for holding a state in which the bottom surface and the side surface, and the side surface and the connecting surface have a certain angle. .. The solar cooker according to any one of claims 1 to 6, wherein the side surface is provided with at least one handle.

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