Cover box

Abstract

To obtain a lidded box which is easy to assemble and convenient to handle, in which a box body and a lid body for closing the opening of the box body are each assembled from one sheet.SOLUTION: At a bottom plate part in the case of a box main body 1A, and at a top plate part in the case of a lid body 1B, a folding portion 10 is provided which is inwardly folded into a triangular shape between a first side wall portion 4 and a second side wall portion 6 provided adjacent to each other on the four sides of the flat plate 2, and folded into the inner and outer surface sides of the second side wall portion 6, and projecting pieces 11a and 11b are provided on the two open sides of the folded portion 10, further, a locking piece portion 15 connected to the open side of the second side wall portion 6 via a sixth folding line 14 is further provided. Fitting openings 16a and 16b for fitting projecting pieces 11a and 11b provided in the folded portion 10 are formed between the locking piece portion 15 and the second side wall portion 6. By folding the locking piece portion 15 along the sixth folding line 14, the projecting piece portions 11a and 11d provided on the open side of the folded portion 10 folded on the inner surface side of the second side wall portion 6 are fitted into the fitting openings 16a and 16b.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lidded box in which the box body and the lid that closes the opening of the box body are each assembled from a single sheet, and is particularly suitable for storing powders and liquids. [Background technology]

[0002] As shown in FIG. 17, a cardboard box is known that is assembled from a single sheet. The cardboard box has side walls 51, 51, 52, 52 connected to the four peripheral edges of a quadrangular bottom wall 50 of the box body, a connecting piece 53 that is connected and folded in two outward across the side edges of adjacent side walls 51, 52, and folded-back pieces 54, 55 that are folded back outward are connected to the upper edges of each side wall 51, 51, 52 of the box body and to the upper edge of the outer edge of connecting piece 53, and the folded-back pieces 56 of these outer edges are connected to both ends of the folded-back pieces 54 of one pair of opposing side walls, and a fold-in piece 57 that is foldable between the connecting piece and the side wall is connected to the tip of the folded-back piece 55 of the other pair of opposing side walls, and when the fold-in piece 57 is folded between the folded-back piece 56, connecting piece 53, and side wall 52, a handle is formed at the top of the pair of opposing side walls (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-273131 Summary of the Invention [Problem to be solved by the invention]

[0004] The cardboard box described in Patent Document 1 is assembled by raising side walls 51, 51, 52, 52 from the four sides of bottom wall 50, folding connecting piece 53, which is connected across the sides of adjacent side walls 51, 52, outward in two, folding back piece 54 connected to the upper edge of each side wall 51, 51 and folding back piece 56 connected to the upper edge of the outer side of connecting piece 53 outward, overlapping connecting pieces 53, 53 folded outward in two and folding back piece 56 connected to the upper edge of the outer side of connecting piece 53 on the outer faces of side walls 52, 52, folding back folding piece 55 connected to the upper edges of side walls 52, 52 outward on top of them, and folding back folding piece 57 connected to the tip of folding back piece 55 between folding back piece 56, connecting piece 53 and side wall 52, which has the problem that assembly is very troublesome.

[0005] Furthermore, connecting pieces 53, 53 that are connected across the sides of adjacent side walls 51, 52 and folded in half outward, and folded back piece 56 that is connected to the upper edge of the outer piece of connecting piece 53 and folded back outward are superimposed on the outer surfaces of side walls 52, 52, and on top of that is further superimposed folded back piece 55 that is connected to the upper edges of side walls 52, 52 and folded back outward, so that protrusions are formed on the outer surfaces of side walls 52, 52 of the box body, which can become an obstacle during handling.

[0006] To provide a box-with-box in which the box body and the lid body for closing the opening of the box body are each assembled from a single sheet, which is easy to assemble and convenient to handle. [Means for solving the problem]

[0007] In order to achieve the above object, the invention described in claim 1 provides a lidded box comprising a rectangular box body assembled from a single sheet, and a lid body assembled from a single sheet that is detachably fitted around the outer periphery of the box body to cover the side surfaces and the top opening of the box body, wherein both the box body and the lid body have first side wall portions that are connected via first fold lines to two opposing sides of a rectangular flat plate portion that serves as a bottom plate in the case of the box body and a top plate in the case of the lid, and second side wall portions that are connected via second fold lines to the other two opposing sides of the flat plate portion, and between the first side wall portion and the second side wall portion that are adjacent to each other, third fold lines and fourth fold lines are provided at both side edges, respectively. a folding portion is provided which is connected via a line and formed into a rectangle with both side edges as two sides, and is folded inward in half with the diagonal line between the third fold line and the fourth fold line as a fifth fold line to form a triangle which is folded onto the inner surface of the second side wall portion; protruding pieces are provided on the two open sides of the folding portion; and a locking piece is provided which is connected to the open side of the second side wall portion via a sixth fold line, and a fitting opening is formed between the locking piece and the second side wall portion into which the protruding piece provided on the folding portion fits; and by valley-folding the locking piece from the sixth fold line, the protruding piece provided on the open edge of the folding portion folded onto the inner surface of the second side wall portion fits into the fitting opening.

[0008] According to the invention of claim 1, the box body and the lid can be assembled from a single sheet by a simple operation of folding the fold-in portion between the adjacent first and second side wall portions inward in half by valley-folding the third and fourth fold lines and mountain-folding the fifth fold line, raising the first and second side wall portions from the flat plate portion by valley-folding them from the first and second fold lines, folding the folded-in portion toward the inner surface of the second side wall portion and overlapping it with the inner surface of the second side wall portion, and from this state, valley-folding the locking piece portion provided on the open edge of the second side wall portion from the sixth fold line, and fitting the protruding piece portion provided on the open edge of the fold-in portion folded toward the inner surface of the second side wall portion into the fitting opening formed between the locking piece and the second side wall portion. In addition, since there are no obstructive protrusions on the outer surfaces of the first and second side walls of the assembled box body and lid, a box with a lid that is easy to handle can be obtained. Furthermore, since the box body and the lid have the same shape, it is possible to simplify the equipment required for automatic box making.

[0009] The invention of claim 2 relates to the invention of claim 1, wherein the protruding pieces provided on the two open sides of the fold-in portion are formed by cutting out a central portion of the two open sides of the fold-in portion to a depth exceeding the sheet thickness to form a recess, and the protrusions on both sides of the recess serve as the protruding pieces, and the recess and the protrusion formed on the two open sides of the fold-in portion are formed to overlap when the fold-in portion is folded in half along the fifth fold line, and the locking piece provided on the open side of the second side wall portion is formed by one of the two overlapping protrusions. The hole-shaped fitting opening is formed into which the protruding piece portion fits, and groove-shaped fitting openings are formed on both sides of the hole-shaped fitting opening into which the other protruding piece portion fits, and the space between the hole-shaped fitting opening and the groove-shaped fitting opening is a connecting portion that connects to the second side wall portion, and the connecting portion has a width that can fit into the recesses formed on the two open sides of the folding portion, and further, the second side wall portion is provided with a notch that forms 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 notch is the sixth fold line.

[0010] According to the invention described in claim 2, the depth of the recess formed on the open edge of the folding portion exceeds the thickness of the sheet. Therefore, when the connecting portion of the locking piece portion is folded in a valley from the sixth fold line and fitted into the recess of the folding portion, the tip of the protruding portion of the folding portion that is fitted into the fitting opening formed in the locking piece portion by the valley fold of the connecting portion of the locking piece portion protrudes from the upper surface of the locking piece portion. Therefore, a secure locking state is obtained between the protruding portion and the locking piece portion, and the second side wall portion and the folding portion folded toward the inner surface of the second side wall portion can be securely fixed, resulting in a robust box body and lid body.

[0011] The invention described in claim 3 is a lidded box comprising a rectangular box body assembled from a single sheet, and a lid body assembled from a single sheet that detachably fits around the outer periphery of the box body to cover the side surfaces and the top opening of the box body, wherein both the box body and the lid body have first side wall portions connected to two opposing sides of a rectangular flat plate portion that serves as a bottom plate in the case of the box body and a top plate in the case of the lid body via first fold lines, and second side wall portions connected to two other opposing sides of the flat plate portion via second fold lines, and are connected to left and right side end edges of the first side wall portion via third fold lines, a folding portion is provided which is formed in a rectangular shape with the side edge as one side, and is valley-folded from a third fold line and folded so as to overlap the inner surface side of the second side wall portion; a protruding piece is provided on an open side of the folding portion which is continuous with the upper side of the first side wall portion; and a locking piece is provided which is connected to the open side of the second side wall portion via a sixth fold line; a fitting opening is formed between the locking piece and the second side wall portion, into which the protruding piece provided on the folding portion fits; and by valley-folding the locking piece from the sixth fold line, the protruding piece provided on the open side of the folding portion folded toward the inner surface side of the second side wall portion fits into the fitting opening. The protruding piece provided on the open edge of the folding portion has a central portion of the open edge of the folding portion cut out to a depth exceeding the sheet thickness to form a recess, and the protrusions on both sides of the recess serve as the protruding piece. The locking piece provided on the open edge of the second side wall has two protruding pieces formed by the protrusions on both sides of the recess, and a hole-shaped fitting opening is formed therein into which one of the protruding piece fits, and groove-shaped fitting openings are formed on both sides of the hole-shaped fitting opening into which the other protruding piece fits, and the space between the hole-shaped fitting opening and the groove-shaped fitting opening forms a connecting portion between the locking piece and the second side wall, and the connecting portion has a width that can fit into the recess formed on the open edge of the folding portion. Furthermore, the second side wall has a notch that forms 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 notch forms the sixth fold line. It is characterized by:

[0012] According to the invention of claim 3, the box body and the lid body can be assembled from a single sheet by a simple process of: valley-folding the fold-in portions provided on the left and right side edges of the first side wall portion from the third fold line; valley-folding the first side wall portion and the second side wall portion from the flat portion from the first fold line and the second fold line to raise the first side wall portion and the second side wall portion; folding the valley-folded fold-in portions so as to overlap the inner surface of the raised second side wall portion; and, from this state, valley-folding the locking piece portion provided on the open edge of the second side wall portion from the sixth fold line; and fitting the protruding piece portion provided on the open edge of the fold-in portion folded toward the inner surface of the second side wall portion into the fitting opening formed between the locking piece portion and the second side wall portion. In addition, since there are no obstructive protrusions on the outer surfaces of the first and second side walls of the assembled box body and lid, a box with a lid that is easy to handle can be obtained. Furthermore, since the box body and the lid have the same shape, it is possible to simplify the equipment required for automatic box making. Furthermore, since the depth of the recess formed on the open edge of the folding portion exceeds the thickness of the sheet, when the connecting portion of the locking piece portion is valley-folded from the sixth fold line and fitted into the recess of the folding portion, the tip of the protruding piece portion of the folding portion that is fitted into the fitting opening formed in the locking piece portion by the valley fold of the connecting portion of the locking piece portion protrudes from the upper surface of the locking piece portion, thereby achieving a secure engagement between the protruding piece portion and the locking piece portion, allowing the second side wall portion and the folding portion folded toward the inner surface of the second side wall portion to be securely fixed, resulting in a robust box body and lid body.

[0015] Claim 4 The invention described in claims 1 to 3 The sheet used for the box body according to any one of the above items is characterized in that at least one surface that will become the inner surface is treated to be liquid-resistant.

[0016] Claim 4 According to the invention described above, the sheet used for the box body is treated with a liquid-resistant coating on at least one of the inner surfaces, so that even if the contents are liquid, the contents are less likely to leak and the box body is less likely to become weak.

[0017] Claim 5 The invention described in claims 1 to 4 The sheet according to any one of the above is characterized in that it is made of paper.

[0018] Claim 5 According to the invention described in (1), the sheet is made of paper, so that it can be easily disposed of after use and can be reused as a resource.

[0019] Claim 6 The invention described in claims 1 to 5 The sheet according to any one of the above items is characterized in that it is a cardboard sheet.

[0020] Claim 6 According to the invention described in (1), the sheet is a cardboard sheet, so that a lightweight and sturdy box with a lid can be obtained, and the box is easy to handle and manufacture. [Effects of the Invention]

[0021] As described above, the lidded box according to the present invention can be easily assembled and can be conveniently handled. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view showing a first example of an embodiment of a box with lid according to the present invention. [Figure 2] FIG. 2 is a development view of the box body and the lid body shown in FIG. [Figure 3] 3 is an explanatory diagram showing the process of assembling the box body and the lid body shown in FIG. 2. [Figure 4] 3 is a plan view showing an example of an inner lid attached to the opening of the box body shown in FIG. 2. FIG. [Figure 5] 3 is a plan view showing a state in which an inner lid is attached to the opening of the box body shown in FIG. 2.

[0023] FIG. [Figure 6] FIG. 10 is a perspective view showing a second example of an embodiment of the lidded box according to the present invention. [Figure 7] FIG. 7 is a development view of the box body and the lid body shown in FIG. 6. [Figure 8] FIG. 10 is a perspective view showing a third example of an embodiment of the lidded box according to the present invention. [Figure 9] FIG. 9 is a development view of the box body and the lid body shown in FIG. 8. [Figure 10] 9 is an explanatory diagram showing the process of assembling the box body and the lid body shown in FIG. 8. [Figure 11] 9 is a development view showing another example 1 of the cover body of the third example shown in FIG. 8. FIG. [Figure 12] 12 is an explanatory diagram showing the process of assembling the cover shown in the development view of FIG. 11. FIG. [Figure 13] 12 is a side view showing the state in which the lid shown in the developed view of FIG. 11 is placed on the box body. FIG. [Figure 14] 9 is a development view showing another example of the cover body of the third example shown in FIG. 8. FIG. [Figure 15] 15 is an explanatory diagram showing the process of assembling the cover shown in the development view of FIG. 14. [Figure 16]15 is a side view showing the state in which the lid shown in the developed view of FIG. 14 is placed on the box body. FIG. [Figure 17] FIG. 1 is a perspective view showing a conventional box. DETAILED DESCRIPTION OF THE INVENTION

[0023] An example of a form of a lidded box according to the present invention will be described in detail below with reference to the drawings. Figures 1 to 5 show a first example of an embodiment of a box according to the present invention, where Figure 1 is an oblique view of the first example of a lidded box, Figure 2 is an expanded view of the box body and lid shown in Figure 1, Figure 3 is an explanatory diagram showing the process of assembling the box body and lid shown in Figure 2, Figure 4 is a plan view showing an example of an inner lid to be attached to the opening of the box body shown in Figure 2, and Figure 5 is a plan view showing the state in which the inner lid has been attached to the opening of the box body shown in Figure 2.

[0024] Box body 1A and lid body 1B that make up lidded box 1 are each assembled from a single sheet. The sheet to be used is not particularly limited as long as it is a sheet-like material, and examples thereof include paper sheets, plastic sheets, etc. Paper sheets include thick paper sheets, white paperboard sheets, corrugated paper sheets, etc., and plastic sheets include plate-like plastic sheets, corrugated plastic sheets, etc.

[0025] Furthermore, the sheet may be liquid-resistant on at least one surface that will become the inner surface of box body 1A and lid 1B. For liquid-resistant treatment, a paper sheet such as a cardboard sheet, white cardboard sheet, or corrugated cardboard sheet may be laminated with a liquid-resistant film or coated with a liquid-resistant paint, or the paper layer may contain a liquid-resistant agent.

[0026] In the first example, a cardboard sheet made of paper with a liquid-resistant paint coating on one side that will become the inner surface of box body 1A is used as the sheet for assembling box body 1A. Also, a cardboard sheet made of paper is used as the sheet for assembling lid body 1B. Note that the liquid-resistant paint may be coated on the one side that will become the inner surface of lid body 1B, or the liquid-resistant paint may be coated on the one side that will become the outer surface of box body 1A and / or lid body 1B depending on the intended use.

[0027] As shown in the developed view of Figure 2, the box body 1A and the lid body 1B, both made of such cardboard sheets, have first side wall portions 4 provided on two opposing sides of a rectangular flat plate portion 2, which serves as the bottom plate portion in the case of the box body 1A and the top plate portion in the case of the lid body 1B, via first fold lines 3, and second side wall portions 6 provided on the other two opposing sides of the flat plate portion 2, via second fold lines 5.

[0028] Between the adjacent first side wall portion 4 and second side wall portion 6, there is provided a folded portion 10 which is connected to both side edges via a third fold line 7 and a fourth fold line 8, formed into a rectangle with both side edges as two sides, and folded inward in half along the diagonal line between the third fold line 7 and the fourth fold line 8 as a fifth fold line 9, to form a triangle which is then folded toward the inner surface of the second side wall portion 6. The rectangle forming the folded portion 10 is a square in this example, but it may also be a rectangle in which the length of the third fold line 7 is slightly shorter than the fourth fold line 8.

[0029] Protrusions 11a and 11b are provided on the two open sides of fold-in portion 10. In the first example, recess 12 is formed by cutting out the center of the two open sides of fold-in portion 10 to a depth greater than the sheet thickness, and protrusions 13a and 13b on both sides of recess 12 are protrusions 11a and 11b, so that recesses 12 formed on the two open sides of fold-in portion 10 and protrusions 13a and 13b overlap when fold-in portion 10 is folded in half along fifth fold line 9.

[0030] The depth of the recess 12 formed by cutting out the center of the two open sides of the fold-in portion 10 is preferably two to three times the sheet thickness. If the depth of the recess 12 is two to three times the sheet thickness, when the protrusions 11a and 11b are fitted into the fitting openings of the locking pieces described below, the tips of the protrusions 11a and 11b protrude from the fitting openings of the locking pieces by a width at least equal to the sheet thickness, thereby ensuring a secure engagement between the protrusions 11a and 11b and the locking pieces. Furthermore, the inner lid described below can be securely placed over the opening of the assembled box body 1A. In this example, the depth of the recess 12 is three times the sheet thickness.

[0031] In addition, a locking piece portion 15 is provided on the open edge of the second side wall portion 6, connected via a sixth fold line 14, and fitting openings 16a, 16b are formed between the locking piece portion 15 and the second side wall portion 6, into which the protrusions 11a, 11b provided on the folded portion 10 fit.By folding the locking piece portion 15 in a valley from the sixth fold line 14, the protrusions 11a, 11b provided on the folded portion 10 folded toward the inner surface of the second side wall portion 2 fit into the fitting openings 16a, 16b.

[0032] In the locking piece portion 15 provided on the open edge of the second side wall portion 6, a hole-shaped fitting opening 16a is formed in the center along the open edge of the second side wall portion 6, into which one of the protrusions 11a consisting of two overlapping protrusions 13a, 13a fits, and groove-shaped fitting openings 16b are formed on both sides of the locking piece portion 15 along the open edge of the second side wall portion 6, into which the other protrusion 11b consisting of two overlapping protrusions 13b, 13b fits.

[0033] The space between hole-shaped fitting opening 16a and groove-shaped fitting opening 16b forms connecting portion 17, which is connected to second side wall portion 6. Connecting portion 17 has a width that allows it to fit into recesses 12 formed on the two open sides of folding portion 10. Second side wall portion 6 is further provided with cutouts 18 that form part of connecting portion 17 within a range that does not exceed the depth of recess 12, and the line connecting the tips of cutouts 18 forms sixth fold line 14. Locking piece portion 15 is also provided with seventh fold line 19 that separates connecting portion 17.

[0034] The box body 1A and the lid body 1B having such an unfolding structure are assembled as follows. First, the first side wall portions 4 provided on two opposing sides of the flat plate portion 2 are raised by valley folding from the first fold line 3, and the second side wall portions 6 provided on the other two opposing sides of the flat plate portion 2 are raised by valley folding from the second fold line 5. In synchronization with the raising of the first side wall portions 4 and the second side wall portions 6, the rectangular folded portion 10 provided between the adjacent first side wall portions 4 and second side wall portions 6 is mountain-folded along the diagonal fifth fold line 9 and valley-folded along the third fold line 7 and the fourth fold line 8, and folded in half inward to form a triangle, which is then folded toward the inner surface of the second side wall portion 6.

[0035] When the folding portion 10 is folded inward in half to form a triangle, the recesses 12 formed on the two open sides of the folding portion 10 and the protrusions 13a, 13b overlap, and the overlapping protrusions 13a, 13b become protrusions 11a, 11b provided on the open sides of the folding portion 10 (see Figure 3).

[0036] Next, the locking piece portion 15 provided on the open edge of the second side wall portion 6 is folded inward from the sixth fold line 14, and the protruding pieces 11a, 11b provided on the folded portion 10 are fitted into the fitting openings 16a, 16b formed between the locking piece portion 15 and the second side wall portion 6.

[0037] 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 along the open edge of the second side wall 6 in the center of the locking piece 15, into which one protrusion 11a consisting of two overlapping protrusions 13a, 13a fits, and groove-shaped fitting openings 16b are formed on both sides of the locking piece 15 along the open edge of the second side wall 6, into which the other protrusion 11b consisting of two overlapping protrusions 13b, 13b fits, and the section between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting section 17 that connects 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 sides of the folding portion 10, and furthermore, the second side wall portion 6 has a notch 18 that forms part of the connecting portion 17 but does not exceed the depth of the recess 12, and the line connecting the tips of the notch 18 forms the sixth fold line 14. By folding the locking piece portion 15 inward from the sixth fold line 14 and fitting the connecting portion 17 into the recess 12, the protrusions 11a and 11b provided on the folding portion 10 fit into the fitting openings 16a and 16b formed between the locking piece portion 15 and the second side wall portion 6 (see Figure 3). In this case, if the rectangle forming the folded portion 10 is a rectangle in which the length of the third fold line 7 is slightly shorter than the fourth fold line 8 relative to the fourth fold line 8, when the lid body 1B is placed over the box body 1A with the inner lid 20 described below attached, the lid can be placed on the box body 1A in a more stable manner, and the lidded boxes 1 containing contents are less likely to collapse even when stacked in multiple layers.

[0038] In this way, the assembly of the box body 1A and the lid body 1B is completed. In particular, in the case of the lid body 1B, the assembly of the lid body 1B is completed by folding the locking piece portion 15 inward from the sixth fold line 14 in a valley fold, and then folding it inward from the seventh fold line 19 in a valley fold so that it overlaps with the folded portion 10 that is folded into the inner surface of the second side wall portion 6 (see Figure 1).

[0039] Furthermore, in the case of the box body 1A, there is no need to further valley fold the locking piece portion 15 that has been valley folded inward from the sixth fold line 14 from the seventh fold line 19 (see Figure 1), but as in the case of the lid body 1B, the locking piece portion 15 may be valley folded from the seventh fold line 19 and overlapped with the fold-in portion 10 that is folded into the inner surface of the second side wall portion 6.

[0040] The box body 1A and lid body 1B of the first example configured in this manner can be easily assembled by a simple process of folding the fold-in portion 10 provided between the adjacent first side wall portion 4 and second side wall portion 6 inward in half, raising the first side wall portion 4 and the second side wall portion 6 from the flat portion 2, folding the folded-in portion toward the inner surface of the second side wall portion 6 and overlapping it with the inner surface of the second side wall portion 6, and from this state, folding the locking piece portion 15 provided on the open edge of the second side wall portion 6 in a valley fold from the sixth fold line 14, and fitting the protrusions 11a and 11b provided on the open edge of the fold-in portion 10 folded toward the inner 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.

[0041] In addition, in the first example, the protrusions 11a and 11b provided on the two open sides of the folding portion 10 are formed by cutting out the central parts of the two open sides of the folding portion 10 to a depth that exceeds the sheet thickness to form recesses 12, and the protrusions 13a and 13b on both sides of recesses 12 are protrusions 11a and 11b, and are formed so that the recesses 12 formed on the two open sides of the folding portion 10 overlap with each other and the protrusions 13a and 13b overlap with each other when the folding portion 10 is folded in half along the fifth fold line 9.

[0042] In the locking piece portion 15, a hole-shaped fitting opening 16a is formed in the center along the open edge of the second side wall portion 6 at the center of the locking piece portion 15, into which one protrusion portion 11a consisting of two overlapping protrusions 13a, 13a fits, and groove-shaped fitting openings 16b are formed on both sides of the locking piece portion 15 along the open edge of the second side wall portion 6, into which the other protrusion portion 11b consisting of two overlapping protrusions 13b, 13b fits. The space between the hole-shaped fitting opening 16a and the groove-shaped fitting opening 16b forms a connecting portion 17 connecting to the second side wall portion 6, and the connecting portion 17 has a width that can fit into the recesses 12 formed on the two open edges of the fold-in 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 recesses 12, and the notch Since the line connecting the tips of 18 forms sixth fold line 14, locking piece portion 15 provided on the open edge of second side wall portion 6 is valley-folded from sixth fold line 14 and tilted inward, and connecting portion 17 is fitted into recess 12, whereby protrusions 11a, 11b provided on folding portion 10 are fitted into fitting openings 16a, 16b formed between locking piece portion 15 and second side wall portion 6, and protrusions 11a, 11b fitted into fitting openings 16a, 16b have their tips protruding from fitting openings 16a, 16b of locking piece portion 15. This ensures a secure engagement between protrusions 11a, 11b and locking piece portion 15, thereby reliably fixing second side wall portion 6 and folding portion 10 folded toward the inner surface of second side wall portion 6, and thereby providing a robust box body 1A and lid body 1B.

[0043] In particular, in the first example, the cut depth of the recess 12 is three times the sheet thickness, so that the tips of the protrusions 11a, 11b engaged with the engagement openings 16a, 16b protrude from the engagement opening of the locking piece 15 by a width at least equal to the sheet thickness, thereby achieving a more secure locking state between the protrusions 11a, 11b and the locking piece 15, and resulting in a more robust box body 1A and lid body 1B.

[0044] Furthermore, since there are no obstructive protrusions on the outer surfaces of the first side wall 4 and second side wall 6 of the assembled box body 1A and lid body 1B, a lidded box 1 that is easy to handle can be obtained.

[0045] Furthermore, the lid body 1B has the same shape as the box body 1A except that its inner dimensions are equal to or greater than the outer dimensions of the box body 1A so that it can be placed over the box body 1A, which makes it possible to simplify the equipment required for automatic box making.

[0046] The box body 1A of the first example may also be provided with a detachable inner lid 20. The inner lid 20 is made of a rectangular plate-like body that fits inside the opening of the box body 1A, and the edge of the inner lid 20 on the second side wall side is formed with a fitting piece 21 that fits into a hole-like fitting opening 16a and a groove-like fitting opening 16b formed in the locking piece 15 and fits between protruding pieces 11a and 11b provided on the open edge of the fold-in part 10 that protrudes from the locking piece 15 (see FIG. 4). The plate-like body is made of the same sheet-like material as the box body 1A.

[0047] When the inner lid 20 configured in this manner is attached to the opening of the box body 1A and closed, the inner lid 20 is fitted into the opening of the box body 1A (see FIG. 5). When inner lid 20 is fitted into the opening of box body 1A, its inner surface abuts against locking piece 15 that is bent inward of box 1, and fitting piece 21 formed on the edge of inner lid 20 on the second side wall side fits into recess 12 formed on the open edge of fold-in portion 10 and abuts against connecting portion 17 of locking piece 15 that fits into recess 12. In this way, inner lid 20 is attached to the opening of box body 1A, and the opening of box body 1A is closed.

[0048] When closing the opening of the box body 1A in this manner, the inner lid 20 can be attached to the opening of the box body 1A by a simple operation of fitting the inner lid 20 into the opening of the box body 1A, thereby closing the opening of the box body 1A. Furthermore, when removing the inner lid 20 that closes the opening of the box body 1A, the inner lid 20 can be removed from the opening of the box body 1A by simply hooking a finger onto the end of the fitting piece 21 of the inner lid 20 that fits into the recess 12 and appears on the outer surface of the second side wall portion 6 and pulling it up, thereby opening the opening of the box body 1A.

[0049] Figures 6 and 7 show a second example of an embodiment of the lidded box according to the present invention, where Figure 6 is an oblique view of the lidded box of the second example, and Figure 7 is an exploded view of the box body and lid shown in Figure 6.

[0050] The box body 1A and lid body 1B that constitute the lidded box 1 of the second example have the same basic structure as the box body 1A and lid body 1B that constitute the lidded box 1 of the first example, and the same components as those of the first example will be described using the same symbols.

[0051] The difference between the second example and the first example lies in the configuration of the fitting openings 16a, 16b formed between the locking piece portion 15 and the second side wall portion 6, into which the protrusion portions 11a, 11b provided on the two open sides of the folding portion 10 fit.

[0052] In the second example, two hole-like fitting openings 16a, 16a are formed in the center between the locking piece 15 and the second side wall 6. The fitting openings 16a, 16a respectively fit protruding pieces 11a, 11a provided on two folded-in portions 10 that are folded from both sides of the second side wall 6 toward the inner surface of the second side wall 6. The space between the fitting openings 16a, 16a forms a connecting portion 17 that is connected to the second side wall 6.

[0053] The other configurations are the same as those in the first example, so the first example will be used and the description thereof will be omitted.

[0054] The box body 1A and lid body 1B of the second example configured in this manner are assembled in the same manner as the box body 1A and lid body 1B of the first example. The assembled box body 1A and lid body 1B of the second example have a tight fit between the fitting openings 16a, 16a and the protruding pieces 11a, 11a, and the second side wall portion 6 and the folded-in portion 10 folded onto the inner surface of the second side wall portion 6 can be securely fixed, resulting in an even more robust box body 1A and lid body 1B.

[0055] Other functions and effects are the same as those of Example 1. Furthermore, the lid body 1B of Example 2 can be used for the box body 1A of Example 1, and the lid body 1B of Example 1 can be used for the box body 1A of Example 2.

[0056] Figures 8 to 10 show a third example of an embodiment of the lidded box according to the present invention, where Figure 8 is an oblique view of the third example of the lidded box, Figure 9 is an exploded view of the box body and lid shown in Figure 8, Figure 10 is an explanatory diagram showing the process of assembling the box body and lid shown in Figure 8, Figure 11 is an exploded view of another example 1 of the lid of the third example shown in Figure 8, Figure 12 is an explanatory diagram showing the process of assembling the lid shown in the exploded view in Figure 11, Figure 13 is a side view showing the state in which the lid shown in the exploded view in Figure 11 has been placed on the box body, Figure 14 is an exploded view of another example 2 of the lid of the third example shown in Figure 8, Figure 15 is an explanatory diagram showing the process of assembling the lid shown in the exploded view in Figure 14, and Figure 16 is a side view showing the state in which the lid shown in the exploded view in Figure 14 has been placed on the box body.

[0057] The box body 1A and lid body 1B that constitute the lidded box 1 of the third example have the same basic structure as the box body 1A and lid body 1B that constitute the lidded box 1 of the first example, and the same components as those of the first example will be described using the same symbols.

[0058] The difference between the third example and the first example is the configuration of the folding portion 10. In the third example, the folding portion 10 is connected to the left and right side edges of the first side wall portion 4 via the third fold line 7, is formed into a rectangular shape with the side edges as one side, and is folded in a valley shape from the third fold line 7 so as to overlap the inner surface of the second side wall portion 6. The open side of the folding portion 10 that is connected to the upper side of the first side wall portion 4 is provided with protrusions 11a and 11b.

[0059] In the case of the protrusions 11a and 11b, as in the first example, the central portion of the open edge connected to the upper edge of the first side wall portion is cut out 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 form the protrusions 11a and 11b.

[0060] The other configurations are the same as those in the first example, so the first example will be used and the description thereof will be omitted.

[0061] The box body 1A and lid body 1B of the third example configured as described above are assembled as follows. First, the folded-in portions 10 connected to the left and right side edges of the first side wall portion 4 are valley-folded from the third fold line 7, and then, as in the first example, the first side wall portions 4 provided on two opposing sides of the flat portion 2 are valley-folded and raised from the first fold line 3, and the second side wall portions 6 provided on the other two opposing sides of the flat portion 2 are valley-folded and raised from the second fold line 5, and the folded-in portions 10 valley-folded from the left and right side edges of the first side wall portion 4 are folded so as to overlap the inner surfaces of the raised second side wall portions 6 (see Figure 10).

[0062] Next, as in the first example, the locking piece portion 15 provided on the open edge of the second side wall portion 6 is folded inward from the sixth fold line 14, and the protruding pieces 11a, 11b provided on the folded portion 10 are fitted into the fitting openings 16a, 16b formed between the locking piece portion 15 and the second side wall portion 6. In this way, the assembly of the box body 1A and the lid body 1B is completed.

[0063] The assembled box body 1A and lid body 1B of the third example have the same functions and effects as those of the first example.

[0064] 11 to 13 show an alternative example 1 of the cover body 1B of the third example shown in Fig. 8, in which an indentation 22 is formed in the center of the open edge of the second side wall portion 6. In addition, an indentation 23 is formed in the open edge of the locking piece portion 15 facing the open edge of the second side wall portion 6 at a position facing the indentation 22 so as not to block the indentation 22 formed in the open edge of the second side wall portion 6 when the locking piece portion 15 is folded in a valley from the sixth fold line 14.

[0065] In addition, in the folding portion 10 connected to the left and right side edges of the first side wall portion 4, a notch portion 24 is formed on the open edge of the folding portion 10 that is connected to the upper edge of the first side wall portion 4 so as not to block the recess 22 formed on the open edge of the second side wall portion 6 when the folding portion 10 is folded so as to overlap the inner surface of the second side wall portion 6. The other configurations are the same as those of the cover body 1B of the third example shown in FIG.

[0066] In the lid body 1B of Alternative Example 1 configured in this manner, similar to the lid body 1B of the third example shown in FIG. 8 , the folded-in portions 10 connected to the left and right side edges of the first side wall portion 4 are valley-folded from the third fold line 7, the first side wall portions 4 provided on two opposing sides of the flat plate portion 2 are valley-folded from the first fold line 3 and raised, and the second side wall portions 6 provided on the other two opposing sides of the flat plate portion 2 are valley-folded from the second fold line 5 and raised, and the folded-in portions 10 valley-folded from the left and right side edges of the first side wall portion 4 are folded so as to overlap the inner surfaces of the raised second side wall portions 6, and the open sides of the second side wall portions 6 are raised. The cover 1B of the other example 1 is assembled by folding the locking piece 15 provided on the cover 10 inward at the sixth fold line 14 in a valley fold, fitting the protrusions 11a and 11b provided on the fold-in portion 10 into fitting openings 16a and 16b formed between the locking piece 15 and the second side wall portion 6, and then folding the locking piece 15 inward at the sixth fold line 14 in a valley fold, and then further folding the locking piece 15 inward at the seventh fold line 19 in a valley fold to overlap the fold-in portion 10 that is folded into the inner surface of the second side wall portion 6 (see FIG. 13).

[0067] According to the lid body 1B of Example 1, in which a finger hook portion 25 is formed by recesses 22, 23 on the open edge of the second side wall portion 6, when removing the lid body 1B placed over the box main body 1A, a finger can be hooked on the finger hook portion 25 formed on the open edge of the second side wall portion 6 of the lid body 1B and pulled up, making it easy to remove the lid body 1B from the box main body 1A.

[0068] In addition, the thickness of the end face of the finger hook portion 25 is the sum of the sheet thickness of the second side wall portion 6 and the sheet thickness of the fold-in portion 10, so it is easy to hook a finger thereon, and the work of removing the lid body 1B from the box body 1A can be easily performed. Other functions and effects are the same as those of the cover 1B of the third example shown in FIG.

[0069] Figures 14 to 16 show another example 2 of the third example of the lid body 1B shown in Figure 8, and in this example 1, a hole 26 is formed in the central portion of the second side wall portion 6 in the open side direction and in a position that is not blocked by the locking piece portion 15 when the locking piece portion 15 is folded in a valley from the sixth fold line 14.

[0070] In addition, in the folding portion 10 connected to the left and right side edges of the first side wall portion 4, a notch portion 27 is formed on the open edge of the folding portion 10 that is perpendicular to the upper edge of the first side wall portion 4 so as not to block the hole portion 26 formed in the second side wall portion 6 when the folding portion 10 is folded so as to overlap the inner surface of the second side wall portion 6. The other configurations are the same as those of the cover body 1B of the third example shown in FIG.

[0071] In the lid body 1B of Alternative Example 2 configured in this manner, similar to the lid body 1B of the third example shown in FIG. 8 , the folded-in portions 10 connected to the left and right side edges of the first side wall portion 4 are valley-folded from the third fold line 7, the first side wall portions 4 provided on two opposing sides of the flat plate portion 2 are valley-folded from the first fold line 3 and raised, and the second side wall portions 6 provided on the other two opposing sides of the flat plate portion 2 are valley-folded from the second fold line 5 and raised, and the folded-in portions 10 valley-folded from the left and right side edges of the first side wall portion 4 are folded so as to overlap the inner surfaces of the raised second side wall portions 6, and the second side wall portions 6 are raised. The cover 1B of the other example 1 is assembled by folding the locking piece 15 provided on the open side of the cover 1B inward along the sixth fold line 14, fitting the protrusions 11a and 11b provided on the fold-in portion 10 into the fitting openings 16a and 16b formed between the locking piece 15 and the second side wall portion 6, and then folding the locking piece 15 inward along the sixth fold line 14 again along the seventh fold line 19 to overlap the fold-in portion 10 which is folded into the inner surface of the second side wall portion 6. The assembled cover 1B of the other example 1 has a finger hook 28 formed by a hole 26 in the second side wall portion 6 (see FIG. 16).

[0072] According to the lid body 1B of Example 2, in which a finger hook portion 28 is formed by a hole portion 26 in the second side wall portion 6, when removing the lid body 1B placed over the box main body 1A, a finger can be hooked on the finger hook portion 28 formed in the second side wall portion 6 of the lid body 1B and pulled up, making it easy to remove the lid body 1B from the box main body 1A.

[0073] In addition, the thickness of the end face of the finger hook portion 28 is the sum of the sheet thickness of the second side wall portion 6 and the sheet thickness of the fold-in portion 10, so it is easy to hook a finger on, making it easy to remove the lid body 1B from the box body 1A. Other functions and effects are the same as those of the cover 1B of the third example shown in FIG.

[0074] Furthermore, the box body 1A of the first or second example can be used in any combination with the lid body 1B of the third example, and the box body 1A of the third example can be used in any combination with the lid body 1B of the first or second example. [Explanation of symbols]

[0075] 1 Box with lid 1A Box body 1B Lid body 2 Flat plate part 3 1st fold line 4 First side wall 5 Second fold line 6 Second side wall 7 Third fold line 8 4th fold line 9 5th fold line 10 Folding section 11a,11b Projection piece 12 recess 13a, 13b protrusion 14 6th fold line 15 Locking piece 16a,16b fitting opening 17 Connection part 18 Cut 19 7th fold line 20 Inner lid 21 Mating piece 22,23 Recess 24 Notch 25 Finger rest 26 Hole 27 Notch 28 Finger rest

Claims

1. A lidded box comprising a rectangular box body assembled from a single sheet and a lid body assembled from a single sheet that is detachably fitted to the outer periphery of the box body to cover the side portions and the top opening of the box body, Both the box body and the lid body are provided with first side wall portions connected via first fold lines to two opposing sides of a rectangular flat plate portion that serves as a bottom plate portion in the case of the box body and a top plate portion in the case of the lid body, and second side wall portions connected via second fold lines to two other opposing sides of the flat plate portion, and are formed into a rectangle with both side edges connected via third fold lines and fourth fold lines between adjacent first and second side wall portions, and are folded in half inward along a diagonal line between the third and fourth fold lines as a fifth fold line. a folding portion that is folded into a triangle toward the inner surface of the second side wall portion, protrusions on the two open sides of the folding portion, and a locking piece that is connected to the open side of the second side wall portion via a sixth fold line, and a fitting opening into which the protrusion on the folding portion fits is formed between the locking piece and the second side wall portion, and by valley-folding the locking piece from the sixth fold line, the protrusion on the open edge of the folding portion that is folded toward the inner surface of the second side wall portion fits into the fitting opening.

2. The protruding pieces provided on the two open sides of the fold-in portion are formed by cutting out the central portions of the two open sides of the fold-in portion to a depth exceeding the sheet thickness to form recesses, and the protrusions on both sides of the recesses serve as the protruding pieces. The recesses and the protrusions formed on the two open sides of the fold-in portion are formed to overlap when the fold-in portion is folded in half along the fifth fold line. The locking piece provided on the open side of the second side wall portion is formed as a hole-shaped fitting into which one of the two overlapping protruding pieces fits. The box with lid described in claim 1, characterized in that a gap is formed, and on both sides of the gap, groove-shaped fitting openings are formed into which the other protrusion portion fits, and the space between the hole-shaped fitting opening and the groove-shaped fitting opening is a connecting portion that connects to the second side wall portion, and the connecting portion has a width that can fit into the recesses formed on the two open sides of the folded-in portion, and further, a notch is provided in the second side wall portion that forms 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 notch is the sixth fold line.

3. A lidded box comprising a rectangular box body assembled from a single sheet and a lid body assembled from a single sheet that is detachably fitted to the outer periphery of the box body to cover the side portions and the top opening of the box body, Both the box body and the lid body are provided with first side wall portions connected via first fold lines to two opposing sides of a rectangular flat plate portion that serves as a bottom plate portion in the case of the box body and a top plate portion in the case of the lid body, and second side wall portions connected via second fold lines to two other opposing sides of the flat plate portion, and are connected to left and right side end edges of the first side wall portion via third fold lines, formed into a rectangular shape with the side end edges as one side, and valley-folded from the third fold line so as to overlap the inner surface of the second side wall portion. a folding portion is provided, and a protruding piece is provided on an open edge of the folding portion that is connected to the upper edge of the first side wall portion; and a locking piece is provided that is connected to the open edge of the second side wall portion via a sixth fold line; and a fitting opening is formed between the locking piece and the second side wall portion, into which the protruding piece provided on the folding portion fits; and by valley-folding the locking piece from the sixth fold line, the protruding piece provided on the open edge of the folding portion that is folded toward the inner surface of the second side wall portion fits into the fitting opening; In the protruding piece provided on the open edge of the folding portion, a recess is formed by cutting out a central portion of the open edge of the folding portion to a depth greater than the sheet thickness, and the protrusions on both sides of the recess are the protruding piece. Furthermore, the locking piece provided on the open edge of the second side wall portion has two protruding pieces formed by the protrusions on both sides of the recess, and one of the two protruding piece portions is formed with a hole-shaped fitting opening into which the protruding piece fits, and on both sides of the hole-shaped fitting opening, a groove-shaped fitting opening into which the other protruding piece fits is formed, and the space between the hole-shaped fitting opening and the groove-shaped fitting opening forms a connection between the locking piece and the second side wall portion, and the connection portion has a width that can fit into the recess formed on the open edge of the folding portion. Furthermore, a notch that forms part of the connection portion is provided in the second side wall portion within a range that does not exceed the depth of the recess, and the line connecting the tips of the notch is the sixth fold line.

4. A lidded box as described in any one of claims 1 to 3, characterized in that the sheet used for the box body has a liquid-resistant treatment applied to at least one of the inner surfaces.

5. A lidded box as described in any one of claims 1 to 4, characterized in that the sheet is made of paper.

6. 6. The box with lid according to claim 1, wherein the sheet is a cardboard sheet.

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