box

Abstract

To provide a box that can be assembled from one sheet, which is easy to assemble and convenient to handle.SOLUTION: A folding part 10 is folded outward into two between neighboring first wall part 4 and second wall part 6 provided on four sides of a bottom part 2 and is folded as a triangle into outer face sides of the first side wall part 4 and / or the second side wall part 6. Two open sides of the folding part 10 have protruding piece parts 11a, 11b thereon, and the open sides of the first side wall part 4 and / or the second side wall part 6 have an engaging piece part 15 that is linked via a sixth folding line 14 thereon. Fitting ports 16a, 16b to which the protruding piece parts 11a, 11b provided on the folding part 10 are fitted are formed between the engaging piece part 15 and the first side wall part 4 and / or the second side wall part 6, and the engaging piece part 15 is ridge-folded from the sixth folding line 14, allowing protruding piece parts 11a, 11b provided on the open sides of the folding part 10 folded onto the outer face sides of the first side wall part 4 and / or the second side wall part 6 to be fitted to the fitting ports 16a, 16b.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a box assembled from a single sheet, and particularly to a box suitable for containing powders and liquids.

Background Art

[0002] As a box assembled from a single sheet, as shown in FIG. 22, side walls 51, 51, 52, 52 are respectively connected to the four peripheral sides of the quadrilateral bottom wall 50 of the box body, and a connecting piece 53 that is folded outward across the sides between adjacent side walls 51, 52 is connected. Folding pieces 54, 55 that are folded outward are connected to the upper edges of each side wall 51, 51, 52, 52 of the box body and the upper edge of the outer piece portion of the connecting piece 53. At the same time, the folding piece 56 of this outer piece portion is connected to both ends of the folding pieces 54 of a pair of opposing side walls, and a folding piece 57 that is folded between the connecting piece and the side wall is connected to the tips of the folding pieces 55 of the other pair of opposing side walls. A cardboard box is known in which a handle portion is formed on the upper portions of a pair of opposing side walls in a state where this folding piece 57 is folded between the folding piece 56, the connecting piece 53, and the side wall 52 (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The corrugated cardboard box described in Patent Document 1 is assembled by raising the side walls 51, 51, 52, 52 from the four sides of the bottom wall 50, folding the connecting piece 53 that spans between the sides of adjacent side walls 51, 52 in half outwards, folding the folded piece 54 that is connected to the upper edge of each side wall 51, 51 and the folded piece 56 that is connected to the upper edge of the outer part of the connecting piece 53 outwards, overlapping the outwardly folded connecting piece 53, 53 and the folded piece 56 that is connected to the upper edge of the outer part of the connecting piece 53 and folded outwards onto the outer surface of the side walls 52, 52, folding the folded piece 55 that is connected to the upper edge of the side walls 52, 52 outwards and overlapping it, and folding the folding piece 57 that is connected to the tip of the folded piece 55 between the folded piece 56, the connecting piece 53 and the side wall 52, which has the problem of being very troublesome to assemble.

[0005] The object of the present invention is to provide a box that can be assembled from a single sheet, is easy to assemble, and is convenient to handle. [Means for solving the problem]

[0006] To achieve the above objective, the invention described in claim 1 is a box assembled from a single sheet, wherein a first side wall portion is provided on two opposing sides of the rectangular bottom, each connected via a first fold line, and a second side wall portion is provided on two other opposing sides of the bottom, each connected via a second fold line, and between adjacent first and second side wall portions, a third fold line and a fourth fold line are provided on both side edges, forming a quadrilateral with the two side edges as two sides, and the diagonal between the third and fourth fold lines is folded outwards in half to form a triangle, with the fifth fold line forming the diagonal between the third and fourth fold lines. Each is folded in the same direction The first side wall portion and the above A folding portion is provided on the outer surface side of the second side wall, and protruding pieces are provided on the two open edges of the folding portion, and the first side wall and the above A locking piece is provided on the open edge of the second side wall, connected via a sixth fold line, and the locking piece and The aforementioned First side wall portion BeforeA fitting opening is formed between the second side wall portions into which the protruding portion provided on the folded portion fits, and by folding the locking portion from the sixth fold line, the first side wall portion fits into the fitting opening and the above Provided on the open edge of the folded portion that is folded into the outer surface of the second side wall The aforementioned It is characterized by having a protruding portion that fits together.

[0007] According to the invention described in claim 1, the folded portion provided between the adjacent first and second side wall portions is folded in half outwards by valley folding along the third fold line, mountain folding along the fourth fold line, and valley folding along the fifth fold line, while raising the first and second side wall portions from the bottom by valley folding along the first and second fold lines, and the folded portion that has been folded in half is Each is folded in the same direction and the first side wall portion The second side wall portion is folded outwards. The first side wall portion and The outer surface of the second side wall is superimposed, and from this state, The first side wall portion and The locking piece provided on the open side of the second side wall is folded in a mountain fold from the sixth fold line, and the locking piece and The first side wall portion and The fitting opening formed between the second side wall portions The first side wall portion and A box can be assembled from a single sheet by a simple operation such as fitting the protruding piece, which is provided on the open edge of the folded portion that is folded into the outer surface of the second side wall, into place. Furthermore, since the assembled box does not have any protruding parts on the inner surfaces of the first and second side walls that would cause obstructions, it is possible to obtain a box that is convenient to handle when putting in or taking out the contents.

[0008] The invention described in claim 2 is characterized in that, in the case of the projection portion provided on the two open sides of the folded portion as described in claim 1, recesses are formed on the two open sides of the folded portion by cutting to a depth exceeding the sheet thickness, and the projections on both sides of the recesses constitute the projection portion, and the recesses and projections formed on the two open sides of the folded portion are formed to overlap when the folded portion is folded in half from the fifth fold line, and the first side wall portion and the aboveThe locking piece provided on the open side of the second side wall has a hole-shaped fitting opening into which one of the two overlapping protrusions fits, and groove-shaped fitting openings formed on both sides of the hole-shaped fitting opening and the groove-shaped fitting opening are located in the first side wall. and the above The connecting portion is connected to the second side wall, and the connecting portion has a width that allows it to fit into the recesses formed on the two open sides of the folded portion, and further the first side wall and the above The second side wall is provided with a notch that forms part of the connecting portion, not exceeding the depth of the recess, and the line connecting the tips of the notch is the sixth fold line.

[0009] According to the invention described in claim 2, since the depth of the recess formed on the open side of the folded portion exceeds the sheet thickness, when the connecting portion of the locking piece is folded in a mountain fold from the sixth fold line and fitted into the recess of the folded portion, the tip of the protruding portion of the folded portion that is fitted into the fitting opening formed on the locking piece by the mountain fold of the connecting portion of the locking piece protrudes from the upper surface of the locking piece, thus a secure locking state is obtained between the protruding portion and the locking piece. The first side wall portion and The second side wall portion and, The first side wall portion and The folded portion, which is folded into the outer surface of the second side wall, can be securely fixed, resulting in a robust box.

[0010] The invention described in claim 3 is characterized in that the sheet described in claim 1 or 2 is treated with a liquid-resistant coating on at least one inner surface.

[0011] According to the invention described in claim 3, since the sheet is treated with a liquid-resistant coating on at least one inner surface, it is less likely that the contents will leak or that the box will become fragile, even if the contents are liquid.

[0012] The invention according to claim 4 is characterized in that the Cobb water absorption of at least one surface which becomes the inner surface of the sheet according to claim 3 is 3 g / m2 or less in 120 seconds or 25 g / m2 or less in 30 minutes.

[0013] According to the invention described in claim 4, since the inner surface of the sheet is a material that is difficult to absorb water, it is less likely that the contents will leak or the box will become fragile even if liquid is directly put into the contents and stored for a long time.

[0014] The invention according to claim 5 is characterized in that the sheet according to claim 4 is made of paper.

[0015] According to the invention described in claim 5, since the sheet is made of paper, it is easy to discard after use and can be reused as a resource.

[0016] The invention according to claim 6 is characterized in that the sheet according to claim 4 is a corrugated cardboard sheet.

[0017] According to the invention described in claim 6, since the sheet is a corrugated cardboard sheet, a lightweight and sturdy box can be obtained, and handling and manufacturing are easy.

Effect of the Invention

[0018] As described above, according to the box according to the present invention, it is easy to assemble, and since there is no protruding portion on the inner surface, a box that is convenient for handling in taking in and out the contents can be obtained.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view showing a first example of an embodiment of a box according to the present invention. [Figure 2] It is a developed view of the box shown in FIG. 1. [Figure 3] It is an explanatory view showing the process of assembling the box shown in FIG. 1. [Figure 4]This is an explanatory diagram showing the process of assembling the box shown in Figure 1. [Figure 5] This is an explanatory diagram showing the process of assembling the box shown in Figure 1. [Figure 6] This is a plan view showing an example of an inner lid to be attached to the opening of the box shown in Figure 1. [Figure 7] This is a plan view showing the box with the inner lid attached to the opening shown in Figure 1. [Figure 8] This is a perspective view showing a second example of an embodiment of the box according to the present invention. [Figure 9] Figure 8 is a net diagram of the box shown. [Figure 10] This is a perspective view showing a third example of an embodiment of the box according to the present invention. [Figure 11] Figure 10 is a net diagram of the box shown. [Figure 12] This is a perspective view showing a fourth example of an embodiment of the box according to the present invention. [Figure 13] Figure 12 is a net diagram of the box shown. [Figure 14] Figure 12 is an explanatory diagram showing the process of assembling the box shown. [Figure 15] Figure 12 is an explanatory diagram showing the process of assembling the box shown. [Figure 16] Figure 12 is an explanatory diagram showing the process of assembling the box shown. [Figure 17] Figure 12 is an explanatory diagram showing an example of how the box can be used. [Figure 18] This is a plan view showing an example of an inner lid to be attached to the opening of the box shown in Figure 12. [Figure 19] Figure 12 is a plan view showing the box with the inner lid attached to the opening. [Figure 20] This is a plan view showing an example of an outer cover. [Figure 21] Figure 20 is an explanatory diagram showing the outer lid placed over the box shown in Figure 1. [Figure 22] This is a perspective view showing a conventional box. [Modes for carrying out the invention]

[0020] Hereinafter, an example of the box configuration according to the present invention will be described in detail with reference to the drawings. Figures 1 to 7 show a first example of an embodiment of the box according to the present invention. Figure 1 is a perspective view of the first example box, Figure 2 is an unfolded view of the box shown in Figure 1, Figures 3, 4, and 5 are explanatory diagrams showing the process of assembling the box shown in Figure 1, Figure 6 is a plan view showing an example of an inner lid to be attached to the opening of the box shown in Figure 1, and Figure 7 is a plan view showing the box shown in Figure 1 with the inner lid attached to the opening.

[0021] Box 1 in the first example is assembled from a single sheet. The sheets used are not particularly limited as long as they are in sheet form, but examples include paper sheets and plastic sheets. Paper sheets include cardboard sheets, white cardboard sheets, and corrugated paper sheets, while plastic sheets include plastic sheet-like sheets and corrugated plastic sheets.

[0022] Furthermore, the sheet can be one on which at least one surface that will be the inner surface of the box is treated with a liquid-resistant coating. For the liquid-resistant coating, a liquid-resistant film may be laminated onto a paper sheet such as a cardboard sheet, white cardboard sheet, or corrugated paper sheet, or a liquid-resistant coating may be applied, or a liquid-resistant agent may be incorporated into the paper layer. In the box of the present invention, when a paper sheet is used for the purpose of emphasizing waterproofness, it is preferable to use a sheet on which at least one surface that will be the inner surface has a Cobb water absorption of 3 g / m2 or less in 120 seconds, or 25 g / m2 or less in 30 minutes. In the first example, a corrugated cardboard sheet made of paper, with one side of the inner surface of box 1 coated with liquid-resistant paint, is used as the sheet for assembling box 1. Depending on the intended use, one of the outer surfaces of box 1 may be coated with liquid-resistant paint.

[0023] In the first example of a box 1 formed from such a corrugated cardboard sheet, as shown in the unfolded view in Figure 2, first side walls 4 are provided on two opposing sides of the rectangular bottom 2 via first fold lines 3, and second side walls 6 are provided on two other opposing sides of the bottom 2 via second fold lines 5.

[0024] Between the adjacent first side wall portion 4 and second side wall portion 6, a folded portion 10 is provided, which is connected to both side edges via a third fold line 7 and a fourth fold line 8, respectively, forming a quadrilateral with both side edges as two sides. The diagonal between the third fold line 7 and the fourth fold line 8 is used as the fifth fold line 9, and the folded portion 10 is folded in half outward to form a triangle which is then folded into the outer surface of the second side wall portion 6. In this example, the quadrilateral forming the folded portion 10 is a square, but it may also be a quadrilateral in which the length of the third fold line 7 is slightly shorter than the length of the fourth fold line 8.

[0025] The two open edges of the folded portion 10 are provided with protruding pieces 11a and 11b. In the first example, the central portion of the two open edges of the folded portion 10 is cut to a depth exceeding the sheet thickness to form a recess 12, and the protrusions 13a and 13b on both sides of the recess 12 are made into protruding pieces 11a and 11b, and the recesses 12 formed on the two open edges of the folded portion 10 and the protrusions 13a and 13b are formed to overlap when the folded portion 10 is folded in half from the fifth fold line 9.

[0026] The cut depth of the recess 12, formed by cutting out the central portion of the two open edges of the folded portion 10, is preferably two to three times the sheet thickness. When the cut depth of the recess 12 is two to three times the sheet thickness, when the protruding portions 11a and 11b are fitted into the fitting opening of the locking piece described later, the tips of the protruding portions 11a and 11b protrude from the fitting opening of the locking piece with a width of at least the sheet thickness, thus ensuring a secure locking state between the protruding portions 11a and 11b and the locking piece. Furthermore, the inner lid described later can be securely placed over the opening of the assembled box 1. In the first example, the cut depth of the recess 12 is three times the sheet thickness.

[0027] Furthermore, a locking piece 15 is provided on the open edge of the second side wall portion 6, connected via a sixth fold line 14. Fitting openings 16a and 16b are formed between the locking piece 15 and the second side wall portion 6, into which the protruding pieces 11a and 11b provided on the folded portion 10 fit. By folding the locking piece 15 along the sixth fold line 14, the protruding pieces 11a and 11b provided on the folded portion 10, which is folded to the outer surface of the second side wall portion 6, fit into the fitting openings 16a and 16b.

[0028] In the first example, a locking piece 15 provided on the open edge of the second side wall 6 has a hole-shaped fitting opening 16a in the center of the locking piece 15, into which two overlapping projections 13a, 13a forming projecting pieces 11a, 11a fit along the open edge of the second side wall 6, and groove-shaped fitting openings 16b are formed on both sides of the locking piece 15, into which two overlapping projections 13b, 13b forming projecting pieces 11b, 11b fit along the open edges of the second side wall 6.

[0029] The space between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting portion 17 connected to the second side wall portion 6, and the connecting portion 17 has a width that allows it to fit into the recesses 12 formed on the two open sides of the folded portion 10. Furthermore, the second side wall portion 6 is provided with a notch 18 that forms part of the connecting portion 17, within a range that does not exceed the depth of the recess 12, and the line connecting the tips of the notches 18 is the aforementioned sixth fold line 14. and A seventh fold line 19 is formed between the locking piece 15 and the other part.

[0030] In addition, the vertical spacing between the fitting openings 16a and 16b, that is, the spacing between the open side of the second side wall portion 6 of the locking piece portion 15 and the open side of the second side wall portion 6, is not particularly limited as long as the fitting of the protruding pieces 11a and 11b into the fitting openings 16a and 16b is ensured. However, when assembling the box 1, if the locking piece portion 15 is folded from the sixth fold line 14, the sixth fold line 14 is the line connecting the tips of the notches 18 that form part of the connecting portion 17 provided in the second side wall portion 6. Therefore, the vertical spacing between the fitting openings 16a and 16b widens by the amount of these notches 18, so it is preferable to make the vertical spacing between the fitting openings 16a and 16b no more than twice the sheet thickness.

[0031] Box 1 of the first example, which has such a deployable structure, is assembled as follows. First, the first side walls 4, which are located on two opposing sides of the base 2, are folded up along the first fold line 3. At the same time, the second side walls 6, which are located on the other two opposing sides of the base 2, are folded up along the second fold line 5. In sync with the raising of the first and second side walls 4 and 6, the rectangular folded portion 10 located between adjacent first and second side walls 4 and 6 is folded in half outwards along the fifth fold line 9 (which forms the diagonal), the third fold line 7, and the fourth fold line 8, forming a triangle, and then folded into the outer surface of the second side wall 6 (see Figures 3 and 4). When the folded portion 10 is folded in half inward to form a triangle, the recesses 12 formed on the two open sides of the folded portion 10 and the protrusions 13a and 13b overlap, and the overlapping protrusions 13a and 13b become the protruding pieces 11a and 11b provided on the open sides of the folded portion 10 (see Figure 4).

[0032] Next, the locking piece 15 provided on the open side of the second side wall 6 is folded outward along the sixth fold line 14, and the protruding pieces 11a and 11b provided on the folded portion 10 are fitted into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall 6.

[0033] In the first example, in the locking piece 15, a hole-shaped fitting opening 16a is formed in the center between the locking piece 15 and the second side wall 6, into which one projection 11a, consisting of two overlapping projections 13a, 13a, fits along the open edge of the second side wall 6. On both sides of the locking piece 15, groove-shaped fitting openings 16b are formed, into which the other projection 11b, consisting of two overlapping projections 13b, 13b, fits along the open edge of the second side wall 6. The connection portion 17 is formed between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b, and the space between them connects to the second side wall portion 6. The connection portion 17 has a width that allows it to fit into the recesses 12 formed on the two open sides of the folded portion 10. Furthermore, the second side wall portion 6 is provided with notches 18 that form part of the connection portion 17, not exceeding the depth of the recesses 12, and the line connecting the tips of the notches 18 is the aforementioned sixth fold line 14. and A seventh fold line 19 is formed between the locking piece 15 and the second side wall 6. The locking piece 15 is folded outward from the sixth fold line 14, and the connecting piece 17 is fitted into the recess 12, thereby fitting the protruding pieces 11a and 11b provided on the folded piece 10 into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall 6. The connecting piece is then folded again from the seventh fold line 19 and overlapped with the second side wall 6 (see Figure 5). This completes the assembly of box 1.

[0034] Thus, the first example of box 1 can be easily assembled by a simple process of folding the folded portion 10, which is provided between the adjacent first side wall portion 4 and second side wall portion 6, outwards in half, raising the first side wall portion 4 and second side wall portion 6 from the bottom portion 2, folding the folded portion 10 in half towards the outer surface of the second side wall portion 6 and overlapping it with the outer surface of the second side wall portion 6, and then mountain folding the locking piece portion 15 provided on the open edge of the second side wall portion 6 from the sixth fold line 14, and fitting the protruding pieces 11a and 11b provided on the open edge of the folded portion 10 that has been folded towards the outer surface of the second side wall portion 6 into the fitting openings 16a and 16b formed between the locking piece portion 15 and the second side wall portion 6.

[0035] In the first example, the protruding pieces 11a and 11b provided on the two open edges of the folded portion 10 are formed when the central part of the two open edges of the folded portion 10 is cut to a depth exceeding the sheet thickness to form a recess 12, and the protrusions 13a and 13b on both sides of the recess 12 become the protruding pieces 11a and 11b, and the recesses 12 formed on the two open edges of the folded portion 10 and the protrusions 13a and 13b are formed to overlap when the folded portion 10 is folded in half from the fifth fold line 9.

[0036] Furthermore, in the locking piece 15, a hole-shaped fitting opening 16a is formed in the center of the locking piece 15, along the open edge of the second side wall 6, into which one projection 11a, consisting of two overlapping projections 13a, 13a, fits. On both sides of the locking piece 15, groove-shaped fitting openings 16b are formed, along the open edges of the second side wall 6, into which the other projection 11b, consisting of two overlapping projections 13b, 13b, fits. The space between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting portion 17 connected to the second side wall 6. The connecting portion 17 has a width that allows it to fit into the recesses 12 formed on the two open edges of the folding portion 10. In addition, the second side wall 6 is provided with notches 18 that form part of the connecting portion 17, within a range that does not exceed the depth of the recesses 12, and the line connecting the tips of the notches 18 is the aforementioned As the 6th fold line 14 is formed, and a 7th fold line 19 is formed between the connecting portion 17 and the locking piece 15, the locking piece 15 provided on the open side of the second side wall portion 6 is folded outward from the 6th fold line 14, and the connecting portion 17 is fitted into the recess 12, so that the protruding pieces 11a and 11b provided on the folded portion 10 fit into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall portion 6, and the tips of the protruding pieces 11a and 11b that are fitted into the fitting openings 16a and 16b protrude from the fitting openings 16a and 16b of the locking piece 15, a secure locking state is obtained between the protruding pieces 11a and 11b and the locking piece 15, so that the second side wall portion 6 and the folded portion 10 folded into the outer side of the second side wall portion 6 can be securely fixed, and a robust box 1 can be obtained.

[0037] In particular, in the first example, since the cut depth of the recess 12 is three times the sheet thickness, the protruding parts 11a and 11b fitted into the fitting openings 16a and 16b have their tips protruding from the fitting opening of the locking piece 15 with a width at least equal to or greater than the sheet thickness. As a result, a more secure locking state is obtained between the protruding parts 11a and 11b and the locking piece 15, and a more robust box 1 can be obtained.

[0038] Furthermore, since the inner surfaces of the first side wall 4 and the second side wall 6 of the assembled box 1 do not have any protruding parts that would be an obstacle, it is possible to obtain a box that is convenient to handle when putting in or taking out the contents. Furthermore, the resulting boxes are not limited to any particular use and can be suitably used not only for transportation but also for storage. Additionally, if a waterproof sheet is used on the inside, they can be used as simple water buckets or trash cans.

[0039] Furthermore, in the case of the first example of the box, if the box's structure, internal shape, and strength are not compromised during assembly, the locking piece 15 may be folded outward from the sixth fold line 14, the protruding pieces 11a and 11b provided on the open side of the folded portion 10 may be fitted into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall 6, and when folding from the seventh fold line 19, the protruding pieces 11a and 11b provided on the open side of the inner piece of the folded portion 10 which has been folded in half into a triangle may be fitted into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall 6, thereby assembling the box 1 by inserting the locking piece 15 between the two pieces of the folded portion 10 which has been folded in half. The box 1 assembled in this manner does not have any protruding parts originating from the locking piece 15 that would cause any obstruction near the open end of the outer surface of the second side wall 6, so a box can be obtained that allows the outer lid to be opened and closed smoothly when using the outer lid described later.

[0040] Furthermore, the box 1 in the first example is equipped with a removable inner lid 30. The inner lid 30 consists of a rectangular plate-like body that fits inside the opening of the box 1. On the side of the inner lid 30 facing the second side wall 6, a fitting piece 31 is formed that fits into a hole-shaped fitting opening 16a and a groove-shaped fitting opening 16b formed in the locking piece 15, and fits between a protruding piece 11a and a protruding piece 11b provided on the open side of the folding portion 10 that protrudes from the locking piece 15 (see Figure 6). Depending on the intended use of the box 1, the plate-like body may be made of the same sheet material as the box 1, or a sheet-like material of a different material may be used.

[0041] When attaching the inner lid 30 configured in this way to the opening of the box 1 and closing it, the inner lid 30 is fitted into the opening of the box 1 (see Figure 7). The inner lid 30, fitted into the opening of box 1, has its inner surface in contact with the locking piece 15 which is bent toward the outer surface of box 1. At the same time, the fitting piece 31 formed on the side of the inner lid 30 toward the second side wall 6 fits into the recess 12 formed on the open side of the folded portion 10 and in contact with the connecting portion 17 of the locking piece 15 which is fitted into this recess 12. In this way, the inner lid 30 is attached to the opening of box 1, and the opening of box 1 is closed.

[0042] In this way, when closing the opening of box 1, the inner lid 30 can be attached to the opening of box 1 by simply fitting the inner lid 30 into the opening of box 1, thereby closing the opening of box 1. Furthermore, to remove the inner lid 30 that closes the opening of box 1, the inner lid 30 can be removed from the opening of box 1 and the opening of box 1 can be opened by simply inserting a finger into the recess 12 and pulling up the end of the fitting piece 31 of the inner lid 30 that is exposed on the outer surface of the second side wall 6.

[0043] In the first example, the folding portion 10 provided between the adjacent first side wall portion 4 and second side wall portion 6 is folded towards the outer surface of the second side wall portion 6, but although not shown, it can also be folded towards the outer surface of the first side wall portion 4. In this case, the locking piece 15 provided on the open edge of the second side wall portion 6 is provided on the open edge of the first side wall portion 4.

[0044] Figures 8 and 9 show a second example of an embodiment of the box according to the present invention, with Figure 8 being a perspective view of the second example box and Figure 9 being an unfolded view of the box shown in Figure 8. Box 1 in the second example is identical in basic configuration to Box 1 in the first example, and components identical to those in the first example are denoted by the same reference numerals.

[0045] The difference between the second example and the first example is that the box 1 in the second example is provided with an inner lid 32, which is not present in the configuration of the first example. In the second example, an inner lid portion 32 is provided on the open edges of the first side wall portions 4, which are provided on two opposing sides of the bottom portion 2, via an eighth fold line 33. The inner lid portion 32 is shaped as being divided into two halves in the middle. In the eighth fold line 33, a notch 34 is provided in the third fold line 7, where the first side wall portion 4 and the folded portion 10 are connected, to the extent that it does not exceed the depth of the recess 12, and the line connecting the tips of the notches 34 is the eighth fold line 33.

[0046] Furthermore, a fitting piece 35 is formed on the open edge of the inner lid portion 32 on the side of the second side wall portion 6, which can be fitted into a recess 12 formed on the open edge of the adjacent folding portion 10. The rest of the structure is the same as in the first example, so we will refer to the first example and omit its explanation.

[0047] The second example of box 1, configured in this way, is assembled in the same way as the first example of box 1. When closing the opening of the assembled box 1, the inner lid portion 32 is folded inward along the eighth fold line 33, and the fitting piece 35 is fitted into the recess 12 formed on the open side of the folded portion 10 (see Figure 8).

[0048] In this way, the opening of the box 1 is closed by folding the inner lid portion 32, which is provided on the open edge of each first side wall portion 4, inward and fitting the fitting piece 35 into the recess 12 formed on the open edge of the folded portion 10.

[0049] Thus, in the second example of box 1, when closing the opening of box 1, the opening of box 1 can be closed by simply bending the inner lid portion 32, which is provided on the open edge of each first side wall portion 4, inward and fitting the fitting piece 35 into the recess 12 formed on the open edge of the folded portion 10. Furthermore, since the inner lid portion 32 is provided integrally with box 1, there is no need to prepare a separate inner lid.

[0050] In the second example, the inner lid portion 32 is provided on each of the first side walls 4, but it may also be provided on either one of the first side walls 4, although this is not shown. In this case, the inner lid portion 32 is twice the size of the inner lid portion 32 shown in Figure 8. In the second example, the inner lid 32 is divided into two parts in the center, but the position of division is not particularly limited as long as it does not impair the function of the lid, and it may be divided into two parts other than the center. Other effects are the same as in the first example.

[0051] Figures 10 and 11 show a third example of an embodiment of the box according to the present invention, where Figure 10 is a perspective view of the third example box and Figure 11 is an unfolded view of the box shown in Figure 10. Box 1 in the third example is identical in basic configuration to Box 1 in the first example, and components identical to those in the first example are denoted by the same reference numerals.

[0052] The difference between the third example and the first example is that the box 1 in the third example is provided with an outer lid 36, which is not present in the configuration of the first example. In the third example, an outer cover portion 36 is provided, connected via an eighth fold line 33 to the open edges of the first side wall portions 4, which are provided on two opposing sides of the bottom portion 2. The outer cover portion 36 is divided into two parts in the middle. In addition, the open edge of the outer cover portion 36 on the second side wall portion 6 side protrudes slightly from the first side wall portion 4. The rest of the structure is the same as in the first example, so we will refer to the first example and omit its explanation.

[0053] The third example of box 1, configured in this way, is assembled in the same way as the first example of box 1. When closing the opening of the assembled box 1, the outer lid portion 36 is folded inward along the eighth fold line 33, bringing the open edge on the second side wall portion 6 side into contact with the open end of the second side wall portion 6 (see Figure 10).

[0054] In this way, the outer cover portion 36 provided on the open edge of each first side wall portion 4 is folded inward, and the open edge on the second side wall portion 6 side is brought into contact with the open end of the second side wall portion 6, thereby closing the opening of the box 1.

[0055] Thus, in the third example of box 1, when closing the opening of box 1, the opening of box 1 can be closed by simply bending the outer cover portion 36 provided on the open edge of each first side wall portion 4 inward and bringing the open edge on the second side wall portion 6 side into contact with the open end of the second side wall portion 6. Furthermore, since the outer cover portion 36 is provided integrally with box 1, there is no need to prepare a separate outer cover.

[0056] In the third example, the outer cover portion 36 is provided on each of the first side wall portions 4, but it may also be provided on either one of the first side wall portions 4, although this is not shown. In this case, the outer cover portion 36 is twice the size of the outer cover portion 36 shown in Figure 10. In the third example, the outer lid 36 is divided into two parts in the center, but the position of division is not particularly limited as long as it does not impair the function of the lid, and it may be divided into two parts other than the center. Other effects are the same as in the first example.

[0057] Figures 12 to 19 show a fourth example of an embodiment of the box according to the present invention. Figure 12 is a perspective view of the fourth example box, Figure 13 is an unfolded view of the box shown in Figure 12, Figures 14, 15, and 16 are explanatory diagrams showing the process of assembling the box shown in Figure 12, Figure 17 is an explanatory diagram showing an example of use of the box shown in Figure 12, Figure 18 is a plan view showing an example of an inner lid to be attached to the opening of the box shown in Figure 12, and Figure 19 is a plan view showing the box shown in Figure 12 with the inner lid attached to the opening. Box 1 in Example 4 is identical in basic configuration to Box 1 in Example 1, and components identical to those in Example 1 are denoted by the same reference numerals and described accordingly.

[0058] The main difference between the fourth example and the first example is that in the fourth example, four folded portions 10, which are provided between adjacent first side wall portions 4 and second side wall portions 6 and are folded in half outward to form triangles, are each folded in the same direction and folded into the outer surfaces of the first side wall portion 4 and second side wall portion 6, and the locking pieces 15 are provided on the open edges of the first side wall portion 4 and second side wall portion 6.

[0059] First, in the fourth example, the base 2 is square, and the first side wall 4 and the second side wall 6 are rectangular in shape, with sides equal to or longer than the length of one side of the base 2.

[0060] Furthermore, in the fourth example, protruding pieces 11a and 11b are provided on both sides of the two open edges of the folded portion 10 located between the adjacent first side wall portion 4 and second side wall portion 6, similar to the first example. In the fourth example, a protruding piece 11c is provided between the protruding pieces 11a and 11b.

[0061] In the fourth example, two recesses 12a and 12b are formed on the two open edges of the folded portion 10 by cutting to a depth exceeding the sheet thickness. The protrusions 13a and 13b on the outside of the recesses 12a and 12b are designated as projections 11a and 11b, and the protrusion 13c on the inside of the recesses 12a and 12b, i.e., between the recesses 12a and 12b, is designated as projection 11c. The recesses 12a and 12b formed on the two open edges of the folded portion 10, and the protrusions 13a, 13b, and 13c, are formed to overlap when the folded portion 10 is folded in half from the fifth fold line 9.

[0062] The cut depth of the recesses 12a and 12b, formed by cutting out the central portion of the two open edges of the folded section 10, is preferably two to three times the sheet thickness. In the fourth example, the cut depth of the recess 12 is three times the sheet thickness, similar to the first example.

[0063] In the fourth example, a locking piece 15 is provided not only on the first side wall portion 4 but also on the open edge of the second side wall portion 6 via the sixth fold line 14. Fitting openings 16a, 16b, and 16c are formed between the locking piece 15 and the first side wall portion 4 and the second side wall portion 6, into which the protruding pieces 11a, 11b, and 11c provided on the folded portion 10 fit. By folding the locking piece 15 along the sixth fold line 14, the protruding pieces 11a, 11b, and 11c provided on the folded portion 10, which is folded to the outer surface of the first side wall portion 4 and the second side wall portion 6, fit into the fitting openings 16a, 16b, and 16c.

[0064] In the fourth example, a locking piece 15 is provided on the open edges of the first side wall 4 and the second side wall 6. In the locking piece 15, a hole-shaped fitting opening 16c is formed in the center of the locking piece 15, along the open edges of the first side wall 4 and the second side wall 6, into which a projection piece 11c consisting of overlapping projections 13c fits. On both sides of the locking piece 15, groove-shaped fitting openings 16a and 16b are formed, along the open edges of the first side wall 4 and the second side wall 6, into which projection pieces 11a and 11b consisting of two overlapping projections 13a and 13b fit.

[0065] The space between the hole-shaped fitting opening 16c and the groove-shaped fitting openings 16a and 16b forms a connecting portion 17 that connects to the first side wall portion 4 and the second side wall portion 6, and the connecting portion 17 has a width that allows it to fit into the recesses 12a and 12b formed on the two open sides of the folded portion 10.

[0066] Furthermore, the first side wall portion 4 and the second side wall portion 6 are provided with notches 18 that form part of the connecting portion 17, within a range that does not exceed the depth of the recesses 12a and 12b, and the line connecting the tips of the notches 18 is the sixth fold line 14 described above. Then, a seventh fold line 19 is formed between the connecting portion 17 and the locking piece portion 15.

[0067] In the fourth example, openings 20 are formed in the first side wall portion 4 or the second side wall portion 6, and in the triangular surfaces of the four folded portions 10 that are folded in half diagonally outwards to form triangles. The openings 20 are formed so that they coincide and communicate with each other when the folded portion 10 is folded in half and the folded portion 10 is placed on the outer surface of the first side wall portion 4 or the second side wall portion 6 (see Figures 12 and 15). The rest of the structure is the same as in the first example, so we will refer to the first example and omit its explanation.

[0068] Box 1 of the fourth example, configured in this way, is assembled as follows. First, the first side wall portion 4 and the second side wall portion 6 are raised in the same manner as in the first example. Synchronized with the raising of the first side wall portion 4 and the second side wall portion 6, the rectangular folded portion 10 provided between the adjacent first side wall portion 4 and the second side wall portion 6 is folded in half outwards by valley folding the fifth fold line 9 which forms the diagonal, then mountain folding the third fold line 7a and the fourth fold line 8b, and valley folding the third fold line 7b and the fourth fold line 8a to form a triangle, and then folded in the same direction with the third fold line 7a and the fourth fold line 8b as axes (see Figure 14), and folded into the outer surface of the first side wall portion 4 and the second side wall portion 6 (see Figure 15).

[0069] Next, the locking pieces 15 provided on the open edges of the first side wall 4 and the second side wall 6 are folded outward along the sixth fold line 14, and the connecting portion 17 is fitted into the recesses 12a and 12b, thereby fitting the protruding pieces 11a and 11b provided on the folded portion 10 into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall 6, and the protruding piece 11c into the fitting opening 16c, and then folded again along the seventh fold line 19 to overlap with the first side wall 4 and the second side wall 6 (see Figure 16). This completes the assembly of box 1.

[0070] Thus, the fourth example of box 1 can be easily assembled by folding the folded portion 10, which is provided between the adjacent first side wall portion 4 and second side wall portion 6, outwards in half, raising the first side wall portion 4 and second side wall portion 6 from the bottom portion 2, folding them outwards in half to form a triangle, folding them in the same direction with the third fold line 7 and the fourth fold line 8 as axes and overlapping them with the outer surfaces of the first side wall portion 4 and second side wall portion 6, and from this state, folding the locking piece portion 15 in a mountain fold from the sixth fold line 14, and fitting the protruding pieces 11a, 11b, and 11c provided on the folded portion 10 into the fitting openings 16a, 16b, and 16c formed between the locking piece portion 15 and the second side wall portion 6.

[0071] In the fourth example, openings 20 are formed in the first side wall portion 4 or the second side wall portion 6, and in the triangular surfaces of the four folded portions 10 that are folded in half diagonally outwards to form triangles. The openings 20 are formed so that they coincide and communicate with each other when the folded portion 10 is folded in half and the folded portion 10 is placed on the outer surface of the first side wall portion 4 or the second side wall portion 6, so that the openings 20 can be used as handles 21.

[0072] In the fourth example, the box 1 is provided on the open edges of the first side wall 4 and the second side wall 6, and by removing one of the four locking pieces 15 that engage the protruding pieces 11a, 11b, and 11c of the folded portion 10, which are superimposed on the outer surfaces of the first side wall 4 and the second side wall 6, into the fitting openings 16a, 16b, and 16c, the folded portion 10 that has been removed from the locking piece 15 protrudes outward, and the protruding folded portion 10 can be used as a watering can with a spout 22 (see Figure 17).

[0073] Furthermore, in the case of the fourth example of the box, if the assembly does not impair the structure, internal shape, and strength of the box, the locking piece 15 may be folded outward from the sixth fold line 14, the protruding pieces 11a, 11b, and 11c provided on the open side of the folded part 10 may be fitted into the fitting openings 16a, 16b, and 16c formed between the locking piece 15 and the first side wall 4 and the second side wall 6, and when folding from the seventh fold line 19, the protruding pieces 11a, 11b, and 11c provided on the open side of the inner piece of the folded part 10 which has been folded in half into a triangle may be fitted into the fitting openings 16a, and 16b formed between the locking piece 15 and the second side wall 6, and the box 1 may be assembled by inserting the locking piece 15 between the two pieces of the folded part 10 which has been folded in half. The box 1 assembled in this manner does not have any protruding parts that would cause obstruction near the open ends of the outer surfaces of the first side wall 4 and the second side wall 6, which originate from the locking piece 15. Therefore, in addition to improving the interior appearance, it is possible to obtain a box that allows the outer lid to be opened and closed smoothly when using the outer lid described later. Other effects are the same as in the first example.

[0074] Furthermore, the fourth example of box 1, like the first example, is equipped with a removable inner lid 30. The inner lid 30 consists of a square-shaped plate that fits inside the opening of box 1. On the sides of the inner lid 30 facing the first side wall portion 4 and the second side wall portion 6, there are fitting pieces 31 that fit into 16a, 16b, and 16c formed on the locking piece portion 15, and fit between the protruding pieces 11a, 11b, and 11c provided on the open side of the folded portion 10 that protrudes from the locking piece portion 15 (see Figure 18). Depending on the intended use of box 1, the plate-like body may be made of the same sheet material as box 1, or a sheet-like material of a different material may be used.

[0075] When attaching the inner lid 30 configured in this way to the opening of the box 1 and closing it, the inner lid 30 is fitted into the opening of the box 1 (see Figure 19). When the inner lid 30 is fitted into the opening of the box 1, its inner surface abuts against the locking piece 15 which is bent toward the outer surface of the box 1, and the fitting pieces 31 formed on the first side wall portion 4 and the second side wall portion 6 of the inner lid 30 fit into the recesses 12a and 12b formed on the open side of the folded portion 10, and abut against the connecting portion 17 of the locking piece 15 which is fitted into these recesses 12a and 12b. In this way, the inner lid 30 is attached to the opening of the box 1 and the opening of the box 1 is closed.

[0076] In this way, when closing the opening of box 1, the inner lid 30 can be attached to the opening of box 1 by simply fitting the inner lid 30 into the opening of box 1, thereby closing the opening of box 1. Furthermore, to remove the inner lid 30 that closes the opening of box 1, the inner lid 30 can be removed from the opening of box 1 and the opening of box 1 can be opened by simply inserting a finger into the end of the fitting piece 31 of the inner lid 30 that is exposed on the outer surface of the first side wall 4 and / or the second side wall 6, which fits into the recesses 12a and 12b, and pulling it up.

[0077] Figures 20 and 21 show examples of outer lids that can be placed over box 1 in the first and fourth examples. Figure 20 is a plan view showing an example of an outer lid, and Figure 21 is an explanatory diagram showing the outer lid shown in Figure 20 placed over the box shown in Figure 1.

[0078] The outer lid 37, like the box 1, is formed from a single sheet. In this example, the same sheet used for the box 1 is used. The outer lid 37 in this example, formed from a single sheet, has a rectangular top portion 38 that is the same size as the outer opening of the box 1, and side wall portions 40 are provided on each of the four sides of the top portion 38 via a ninth fold line 39.

[0079] The outer lid 37, configured in this way, is placed over the box 1 as follows: The side wall portions 40 provided on each of the four sides of the top portion 38 are folded in a mountain fold from the ninth fold line 39, and in this state, the side wall portions 40 are placed over the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the box 1, or the top portion 38 is placed over the opening of the box 1, and then the side wall portions 40 are folded in a mountain fold from the ninth fold line 39, and the side wall portions 40 are placed over the box 1, overlapping the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the box 1 (see Figure 21).

[0080] In this way, adhesive tape is wrapped around the side wall portion 40 of the outer lid 37 placed over the box 1 to prevent the side wall portion 40, which is superimposed on the outer surfaces of the first side wall portion 4 and the second side wall portion 6 of the box 1, from spreading out.

[0081] As shown above, the outer lid 37 of this example can be placed over the box 1 with simple work. [Explanation of symbols]

[0082] 1 box 2 bottom 3 1st fold line 4. First side wall section 5 Second fold line 6. Second side wall section 7 Third fold line 8 4th fold line 9 5th fold line 10 Folded section 11a,11b,11c Projection part 12, 12a, 12b recesses 13a, 13b, 13c protrusions 14 6th fold line 15 Locking piece 16a,16b,16c fitting port 17 Connection part 18 cuts 19 7th fold line 20 openings 21 Handle 22 Spout 30 Inner lid 31 Mating piece 32 Inner lid 33 8th fold line 34 cuts 35 Mating piece 36 Outer Cover 37 Outer Cover 38 top plate 39. The 9th fold line 40 Side wall portion

Claims

1. A box assembled from a single sheet, having first side walls connected to two opposing sides of a rectangular bottom via first fold lines, and second side walls connected to two other opposing sides of the bottom via second fold lines, and between adjacent first and second side walls, there is a fold-in portion, which is connected to both side edges via third and fourth fold lines, forming a quadrilateral with the two side edges as two sides, and is folded in half outward along the diagonal between the third and fourth fold lines as a fifth fold line to form a triangle, which is then folded in the same direction and folded into the outer surfaces of the first and second side walls, The two open edges of the folded portion are provided with protruding pieces, and the open edges of the first and second side walls are provided with locking pieces connected via a sixth fold line, and a fitting opening is formed between the locking pieces and the first and second side walls into which the protruding pieces provided in the folded portion fit. A box characterized in that the locking piece is folded in a mountain fold from the sixth fold line so that the protruding piece provided on the open edge of the folded portion that is folded into the outer surface of the first side wall and the second side wall fits into the fitting opening.

2. In the projecting portion provided on the two open sides of the folded portion, recesses are formed by cutting out the two open sides of the folded portion to a depth exceeding the sheet thickness, and the protrusions on both sides of the recesses constitute the projecting portion, and the recesses and protrusions formed on the two open sides of the folded portion are formed to overlap when the folded portion is folded in half from the fifth fold line, and the locking portion provided on the open sides of the first side wall portion and the second side wall portion has a hole-shaped fitting opening into which one of the projecting portion, which consists of the two overlapping protrusions, fits, The box according to claim 1, characterized in that groove-shaped fitting openings are formed on both sides of the first side wall portion into which the other projection portion fits, the space between the hole-shaped fitting opening and the groove-shaped fitting opening forms a connecting portion connecting the first side wall portion and the second side wall portion, the connecting portion has a width that allows it to fit into the recesses formed on the two open sides of the folded portion, and the first side wall portion and the second side wall portion are provided with notches that form a part of the connecting portion within a range that does not exceed the depth of the recess, and the line connecting the tips of the notches is the sixth fold line.

3. The box according to claim 1 or 2, characterized in that the sheet has been treated to be liquid-resistant on at least one inner surface.

4. The box according to claim 3, characterized in that the Cobb water absorption of at least one inner surface of the sheet is 3 g / m² or less after 120 seconds, or 25 g / m² or less after 30 minutes.

5. The box according to claim 4, characterized in that the sheet is made of paper.

6. The box according to claim 4, characterized in that the sheet is a corrugated cardboard sheet.

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