Container forming sheet body and container

Abstract

To provide a sheet body for container formation which can reduce a workload at the time of assembly, and a container assembled by the sheet body for container formation.SOLUTION: In a sheet body 100 for container formation, first side walls 120 and 140 and second side walls 160 and 170 are projectingly formed on a bottom plate 110 constituting a bottom part of a container 180. In the first side walls 120 and 140, inside walls 126 and 146 for first side walls are formed outside outside walls 121 and 141 for first side walls. In the outside walls 121 and 141 for the first side walls, second side wall constitution pieces 130 and 150 are formed in a direction perpendicular to a projecting direction of the outside walls 121 and 141 for the first side walls. In the second side wall constitution pieces 130 and 150, first inside pieces 131 and 151 and second inside pieces 137 and 157 arranged inside the second side walls 160 and 170 are formed. The second inside pieces 137 and 157 are separated from the inside walls 126 and 146 for the first side walls.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a single container-forming sheet body that is assembled into a box-shaped container that is open at the top, and to a container that is assembled from this container-forming sheet body. [Background technology]

[0002] Conventionally, there is a single sheet body for forming a container that is assembled into a box-shaped container with an opening at the top, and a container assembled from this sheet body for forming a container. For example, the following Patent Document 1 discloses a folding tray in which an extension wall (2A, 3A) that constitutes a short side wall is formed on a long side wall of the side walls that surround the periphery of the contained object in a rectangular shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-11950 A

[0004] However, in the folding tray described in Patent Document 1, the long side wall is composed of two side walls, an inner wall and an outer wall, and the extension walls (2A, 3A) are also composed of two side walls, and there is a problem that a strong force is required to permanently fold the extension walls (2A, 3A) formed on the long side walls, resulting in a large workload. Summary of the Invention

[0005] The present invention has been made to address the above-mentioned problems, and aims to provide a container-forming sheet body that can reduce the workload during assembly, and a container assembled using this container-forming sheet body.

[0006] In order to achieve the above object, the present invention is characterized in that it is a sheet body for forming a container, which is assembled into a box-shaped container having an upper opening, the sheet body having a bottom plate on which an object to be contained is placed, a pair of first side walls which are respectively provided at opposing positions on a part of the outer periphery of the bottom plate and constitute a part of the side wall surrounding the periphery of the object to be contained, and a second side wall which is provided at an upper opening between the pair of first side walls on the outer periphery of the bottom plate and constitutes another part of the side wall surrounding the periphery of the object to be contained, at least one of the pair of first side walls being a first side wall outer wall formed to protrude from the bottom plate, and a first side wall inner wall formed to protrude from the first side wall outer wall on the opposite side to the bottom plate. and a second side wall constituent piece formed to protrude from the first side wall outer wall in a direction perpendicular to the protruding direction of the first side wall outer wall, the second side wall constituent piece having a first inner piece formed to protrude from the first side wall outer wall in a direction perpendicular to the protruding direction of the first side wall outer wall and folded against the first side wall outer wall to be positioned inside the second side wall when the container is assembled, and a second inner piece protruding from the first inner piece and formed at a position adjacent to the first side wall inner wall and folded against the first inner piece to be positioned opposite the first inner piece when the container is assembled, and the second inner piece is not connected to the first side wall inner wall but is separate.

[0007] According to the feature of the present invention thus configured, the container-forming sheet body is configured such that the second inner piece is not connected to the first side wall inner wall but is separate therefrom, so that when folding the second side wall constituent piece against the first side wall, the second side wall constituent piece can be folded with less force, and the workload during assembling the container can be reduced. Furthermore, the container-forming sheet body according to the present invention can also facilitate the folding work of the first side wall inner wall against the first side wall outer wall. The configuration in which the second inner piece is not connected to the first side wall inner wall but is separate therefrom includes a configuration in which a cut (cut line) is formed between the first side wall inner wall and the second inner piece, as well as a configuration in which a groove-shaped notch is formed between the first side wall inner wall and the second inner piece.

[0008] Further, according to the present invention thus configured,In the container forming sheet body, since the two first side walls constituting a pair of first side walls each have an outer wall for the first side wall, an inner wall for the first side wall, and a second side wall component piece, the strength of the second side wall can be improved by the pair of second side wall component pieces and the workload for assembling the pair of second side wall component pieces can be reduced.

[0009] Further, according to the present invention thus configured, The container-forming sheet body has a length such that the second sidewall constituent pieces formed on the pair of first side walls overlap each other when the container is assembled, and has a first connecting portion formed on a free end side opposite the first sidewall outer wall between the first inner piece and the second inner piece, and a fitting opening adjacent to the first connecting portion and opening larger than the first connecting portion. This allows the container-forming sheet body to have the connecting portions fitted into each other's fitting openings when the second sidewall constituent piece of one first side wall of the pair of first side walls is overlapped on the second sidewall constituent piece of the other first side wall, and the pair of second sidewall constituent pieces are firmly connected to each other, thereby increasing the rigidity of the second side walls.

[0010] Another feature of the present invention is that, in the container forming sheet body, the locking portion is formed in a planar shape extending horizontally between the first inner piece and the second inner piece when the container is assembled.

[0011] According to the features of the present invention configured as described above, the locking portion of the container-forming sheet body is formed in a planar shape extending horizontally when the container is assembled, and thus can prevent deformation and damage to the upper surface of the second side wall by surface contact with the second side wall. In particular, the container-forming sheet body can prevent damage when the second side wall is strongly pressed against the locking portion due to the weight when stacked when used as a container.

[0012] Another feature of the present invention is that, in the container-forming sheet body, the second inner piece is formed spaced apart from the first sidewall-forming inner wall.

[0013] According to the characteristics of the present invention configured in this manner, the container forming sheet body has the second inner piece formed at a distance from the first side wall inner wall, so that there is no friction between the first side wall inner wall and the second inner piece, making it easier to fold the first side wall inner wall and the second side wall component piece.

[0014] Another feature of the present invention is that, in the container forming sheet body, the second inner piece is formed so that the opposing edge facing the first side wall inner wall is inclined away from the first side wall inner wall toward the outside from the first inner piece side.

[0015] According to the features of the present invention configured in this manner, the container forming sheet body is formed so that the opposing edge of the second inner piece that faces the inner wall for the first side wall is inclined away from the inner wall for the first side wall from the first inner piece side toward the outside (free end side) so as to reduce the amount of contact of the second inner piece that is arranged adjacent to the inner wall for the first side wall during assembly of the container, thereby making it easier to arrange the second inner piece.

[0016] Another feature of the present invention is that, in the container forming sheet body, the second inner piece has an engaging protrusion that protrudes outward on the outer edge opposite the first inner piece, and the bottom plate has an engaging through hole formed at a position adjacent to the second side wall into which the engaging protrusion is inserted.

[0017] According to the feature of the present invention configured in this manner, the container forming sheet body has an engagement through hole formed at a position adjacent to the second side wall on the bottom plate, into which the engagement protrusion is inserted, so that the second inner piece can be permanently positioned with high precision and made to stand up when assembling the container.

[0020] Another feature of the present invention is that, in the container forming sheet body, the second side wall is formed with a through-hole-shaped handle portion that serves as a handle when the container is assembling, and the second side wall component piece is formed with a through-hole-shaped inner handle portion that is the same size as the handle portion or larger than the handle portion at a position that overlaps with the handle portion when the container is assembling.

[0021] According to the features of the present invention configured as described above, the container-forming sheet body has a through-hole-shaped inner handle portion that is the same size as or larger than the handle portion at a position that overlaps with the handle portion of the second side-wall constituent piece when the container is assembled, so that the handle portion is formed by the second side wall and the second side-wall constituent piece, thereby improving strength. Also, the container-forming sheet body has a through-hole-shaped inner handle portion that is larger than the handle portion at a position that overlaps with the handle portion of the second side-wall constituent piece when the container is assembled, so that there is no need to strictly align the position of the inner handle portion with respect to the handle portion, thereby improving work efficiency.

[0022] Furthermore, the present invention can be embodied not only as an invention of a sheet body for forming a container, but also as an invention of a container assembled from this sheet body for forming a container.

[0023] Specifically, the container is a box-shaped container having a bottom plate on which the contents are placed, a pair of first side walls that are provided on a part of the outer periphery of the bottom plate at positions facing each other and that constitute a part of the side wall surrounding the contents, and a second side wall that is provided on the outer periphery of the bottom plate and that constitutes another part of the side wall surrounding the contents, and the container is made of a container-forming sheet body according to any one of claims 1 to 8. This makes it possible to expect the container to have the same effects as the container-forming sheet body. [Brief description of the drawings]

[0024] [Figure 1] 1 is a plan view showing the external configuration of a container-forming sheet body according to the present invention in a developed state. [Diagram 2] 2 is a perspective view showing a schematic external configuration of the container-forming sheet body shown in FIG. 1. [Diagram 3] 3 is a perspective view showing a state in which the assembly process has progressed for the container-forming sheet body shown in FIG. 2. FIG. [Figure 4] 4 is a perspective view showing a state in which the assembly process has progressed for the container-forming sheet body shown in FIG. 3. FIG. [Diagram 5] 5 is a perspective view showing a state in which the assembly process has progressed for the container-forming sheet body shown in FIG. 4. FIG. [Figure 6] 6 is a perspective view showing a state in which an assembly process has progressed for the container-forming sheet body shown in FIG. 5. FIG. [Figure 7] FIG. 7 is a perspective view of a container according to the present invention, showing a state in which a container has been assembled by proceeding with an assembly process for the container-forming sheet body shown in FIG. 6. [Figure 8] 1A and 1B show a pair of second side wall constituent pieces in a container-forming sheet body relating to a modified example of the present invention, where 1A is a partial plan view showing the external configuration of one of the pair of second side wall constituent pieces in an unfolded state, and 1B is a partial plan view showing the external configuration of the other of the pair of second side wall constituent pieces in an unfolded state. [Figure 9] 9 is a perspective view showing a state of an assembly process corresponding to FIG. 6 in the container-forming sheet body shown in FIG. 8. FIG. [Figure 10] FIG. 11 is a partial plan view showing the exterior configuration of one of a pair of second side wall constituent pieces in a container-forming sheet body according to another modified example of the present invention, in a developed state. [Figure 11] 11 is a perspective view showing a state in an assembly process corresponding to FIG. 6 in the container-forming sheet body shown in FIG. 10. FIG. [Figure 12] FIG. 11 is a partial plan view showing the exterior configuration of one of a pair of second side wall constituent pieces in a container-forming sheet body according to another modified example of the present invention, in a developed state. [Figure 13] FIG. 11 is a plan view showing the external configuration of a container-forming sheet body according to another modified example of the present invention in an unfolded state. [Figure 14] 14 is a perspective view showing a state in which the container-forming sheet body shown in FIG. 13 is folded. FIG. [Figure 15] 14 is a perspective view showing a state in the process of folding the container-forming sheet body shown in FIG. 13. FIG. [Figure 16] 16 is a perspective view showing a state in which the container-forming sheet body shown in FIG. 15 is further folded. FIG. [Figure 17] FIG. 11 is a plan view showing the external configuration of a container-forming sheet body according to another modified example of the present invention in an unfolded state. [Figure 18] 18 is a perspective view showing a state in the process of dismantling a container assembled from the container-forming sheet body shown in FIG. 17. FIG. [Figure 19] FIG. 19 is a perspective view showing a state in the process of further dismantling the container shown in FIG. 18. [Figure 20] 20 is a perspective view showing a state in which the container shown in FIG. 19 is further folded. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the container-forming sheet body and the container according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the exterior configuration of the container-forming sheet body 100 according to the present invention in an unfolded state. FIG. 2 is a perspective view showing the exterior configuration of the container-forming sheet body 100 shown in FIG. 1. In addition, in each of the drawings referred to in this embodiment and each of the modified examples, the folds in the unfolded state are shown by dashed lines. In addition, in each of the drawings referred to in this embodiment and each of the modified examples except for FIG. 1, only the main symbols are given and other symbols are appropriately omitted to facilitate understanding. This container-forming sheet body 100 forms a container 180 that contains contents (not shown) such as lunch boxes or packaged side dishes for transport or storage.

[0026] (Configuration of container-forming sheet body 100) The container-forming sheet body 100 is mainly composed of one bottom plate 110, a pair of first side walls 120, 140, and a pair of second side walls 160, 170 on one sheet of corrugated cardboard material extending in a strip shape. The bottom plate 110 is a portion on which the contents are placed, and is formed in a square shape in a plan view. In this embodiment, the bottom plate 110 is formed in a rectangular shape in a plan view, but may be a shape other than a rectangle, for example, a polygonal shape such as a square or a hexagon. In FIG. 1, the circle drawn on the bottom plate 110 indicates the direction in which the flutes of the corrugated cardboard constituting the container-forming sheet body 100 are formed.

[0027] The bottom plate 110 has lines 111a, 111b and lines 112a, 112b formed at the boundary portions between the pair of first side walls 120, 140 and the boundary portions between the pair of second side walls 160, 170 in each outer periphery consisting of four sides. The lines 111a, 111b are formed in a linear shape to facilitate accurate folding of the pair of first side walls 120, 140 relative to the bottom plate 110. The lines 112a, 112b are formed in a linear shape to facilitate accurate folding of the pair of second side walls 160, 170 relative to the bottom plate 110. A first side wall engagement through hole 113 and a second side wall engagement through hole 114 are formed near the lines 111a, 111b and lines 112a, 112b, respectively.

[0028] The first sidewall engagement through hole 113 is a portion for maintaining the folded state of the first sidewall inner wall 126 by inserting a first sidewall engagement protrusion 128 formed on the first sidewall inner wall 126 described later, and is configured as a through hole having a rectangular shape in a plan view. Two first sidewall engagement through holes 113 are formed in a state in contact with the lines 111a and 111b, respectively. Moreover, the width of each of these first sidewall engagement through holes 113 in the thickness direction of the first sidewall inner wall 126 is formed to be two times or more and ten times or less than the thickness of the first sidewall inner wall 126. In this embodiment, the width of each first sidewall engagement through hole 113 is formed to be five times the length (width) of the thickness of the first sidewall inner wall 126. As a result, the first sidewall engagement through hole 113 is configured to allow a change in the bending angle of the first sidewall inner wall 126 with respect to the first sidewall ceiling part 124.

[0029] The second sidewall engagement through-holes 114 are portions for maintaining the folded state of the second inner piece 137 by inserting second sidewall engagement protrusions 138 formed on the second sidewall constituent piece 130 described later, and are configured as through-holes having a rectangular shape in a plan view. Two second sidewall engagement through-holes 114 are formed at positions spaced apart from the lines 112a and 112b toward the center of the bottom plate 110. The width of each of the second sidewall engagement through-holes 114 in the thickness direction of the second sidewall constituent piece 130 is formed to be two times or more and ten times or less the thickness of the second sidewall constituent piece 130. In this embodiment, the width of each second sidewall engagement through-hole 114 is formed to be twice the length (width) of the thickness of the first sidewall inner wall 126. The first side wall engagement through-hole 113 is configured to allow the bending angle of the second inner piece 137 relative to the connecting portion 134 and the locking portion 135 to be changed.

[0030] Further, each second sidewall engaging through hole 114 has a notch 114a formed at both longitudinal ends toward the center of the bottom plate 110. The notch 114a is a portion for facilitating deformation of a portion of the periphery of the second sidewall engaging through hole 114 to facilitate insertion of the second sidewall engaging protrusion 138 into the second sidewall engaging through hole 114, and is formed as a linear notch connected to the short side of the second sidewall engaging through hole 114. It is needless to say that the positions and numbers of the first sidewall engaging through hole 113 and the second sidewall engaging through hole 114 may be appropriately set.

[0031] The first side walls 120, 140 are provided facing each other on a portion of the outer periphery of the bottom plate 110, and constitute a portion of the side wall surrounding the periphery of the contained object. The first side walls 120 and 140 are formed line-symmetrically across the bottom plate 110 and have substantially the same shape, so the first side wall 120 will be mainly described.

[0032] The first side wall 120 mainly includes one first side wall outer wall 121, one first side wall ceiling portion 124, one first side wall inner wall 126, and a pair of second side wall constituent pieces 130. The first side wall outer wall 121 is a portion that constitutes a part of the outer side wall of the container 180, and is formed in a rectangular shape in a plan view that protrudes outward from the bottom plate 110. This first side wall outer wall 121 has creases 122 and 123 formed at each boundary portion with the first side wall ceiling portion 124 and each boundary portion with the pair of second side wall constituent pieces 130 on each outer periphery consisting of four sides.

[0033] The crease 122 is a portion that facilitates accurate folding of the first side wall ceiling portion 124 relative to the first side wall outer wall 121, and is formed linearly. The crease 123 is a portion that facilitates accurate folding of each second side wall component piece 130 relative to the first side wall outer wall 121, and is formed linearly.

[0034] The first sidewall ceiling portion 124 is a portion that constitutes the upper surface of the first sidewall 120, and is formed in a generally elongated rectangular shape in a plan view that protrudes outward relative to the first sidewall outer wall 121. As a result, the upper surface of the first sidewall 120 is formed in an elongated flat shape. The first sidewall ceiling portion 124 is formed with a first sidewall inner wall 126 via a crease 125. The crease 125 is a portion that facilitates accurate folding of the first sidewall inner wall 126 relative to the first sidewall ceiling portion 124, and is formed in a linear shape.

[0035] The first side wall inner wall 126 is a portion that constitutes a part of the inner side wall of the container 180, and is formed in a substantially rectangular shape in a plan view that protrudes outward from the first side wall outer wall 121 via the first side wall ceiling portion 124. This first side wall inner wall 126 has cutout portions 127 formed at both longitudinal ends of the outer side of the free end opposite the first side wall ceiling portion 124, and a first side wall engagement protrusion 128 formed on the outer side.

[0036] The notch portion 127 is a portion to which a hook portion 167 of the second side wall 160 described later is hooked, and is formed by cutting out a corner of the first side wall inner wall 126. The first side wall engagement projection 128 is a portion for maintaining the folded state of the first side wall inner wall 126 by being inserted into the first side wall engagement through hole 113, and is formed to protrude in a rectangular shape in a plan view from the outer side of the first side wall inner wall 126. In this case, the protrusion amount of the first side wall engagement projection 128 is formed to a length that penetrates the first side wall engagement through hole 113 and protrudes from the bottom plate 110. In this embodiment, the first side wall engagement projection 128 is formed on both end sides in the longitudinal direction of the outer side of the first side wall inner wall 126, but the formation position and the formation number can be appropriately set.

[0037] The second side wall constituent piece 130 is a part that constitutes a part of the second side wall 160, and is formed by projecting outward from both longitudinal ends of the first side wall outer wall 121. These two second side wall constituent pieces 130 are formed line-symmetrically with respect to the first side wall outer wall 121, and have substantially the same shape, so one of the second side wall constituent pieces 130 (the upper one in FIG. 1) will be described. This second side wall constituent piece 130 is mainly composed of a first inner piece 131, a connecting portion 134, and a second inner piece 137.

[0038] The first inner piece 131 is a portion disposed inside the second side wall 160, and is formed to protrude outward from both longitudinal ends of the first sidewall outer wall 121. In this case, the lower side 131a of the first inner piece 131 facing the second side wall 160 is formed such that the tip side portion extends in a direction away from the second side wall 160. The first inner piece 131 is formed with the inner handle portion 132 and a part of the fitting opening 139, and is formed with the connecting portion 134 and the locking portion 135 connected via lines 133a and 133b, respectively.

[0039] The inner handle portion 132 is a portion into which a user who lifts the container 180 inserts his or her fingertips to support the container 180, and is configured as a long through hole. The inner handle portion 132 is formed at a position opposite to a handle portion 162, which will be described later, when the container-forming sheet body 100 is assembled into the container 180. In this case, the inner handle portion 132 is formed to be larger than the handle portion 162.

[0040] The crease 133a is a linear portion that facilitates accurate folding of the connecting portion 134 relative to the first inner piece 131. The crease 133b is a linear portion that facilitates accurate folding of the locking portion 135 relative to the first inner piece 131. These creases 133a and 133b may be formed by pressing cardboard into a line, but because these are portions that have a strong repulsive force when folded, lead creases that include cut lines are preferred for easier assembly.

[0041] The connecting portion 134 is a portion which connects the first inner piece 131 and the second inner piece 137 to each other and is also connected to the second side wall constituent piece 150 of the first side wall 140, and is formed in a generally elongated rectangular shape in a plan view which protrudes outward from the first inner piece 131. This connecting portion 134 is formed on the first side wall ceiling portion 124 side with respect to the fitting opening 139, and is formed in a flat planar shape which extends horizontally when assembled into the container 180.

[0042] The locking portion 135 is a portion for connecting the second side wall constituent piece 130 and the second side wall constituent piece 150 to each other by being fitted into a fitting opening 159 formed in the second side wall constituent piece 150 of the first side wall 140 facing the first side wall 120. This connecting portion 134 is formed on the free end side of the second side wall constituent piece 130 on the opposite side to the connecting portion 134 with respect to the fitting opening 139, and is formed in a flat planar shape extending horizontally when assembled into the container 180. A second inner piece 137 is formed and connected to the connecting portion 134 and the locking portion 135 via lines 136a and 136b, respectively.

[0043] The crease 136a is a portion for making it easier to fold the second inner piece 137 accurately with respect to the connecting portion 134, and is formed in a linear shape. The crease 136b is a portion for making it easier to fold the second inner piece 137 accurately with respect to the locking portion 135, and is formed in a linear shape. In this case, the distance between the crease 133b and the crease 136b is formed wider than the distance between the crease 133a and the crease 136b. In addition, the center line between the crease 133b and the crease 136b is formed to be the same as the center line between the crease 133a and the crease 136b. In other words, the crease 133b and the crease 136b that form a pair are formed concentrically with the crease 133a and the crease 136a that form a pair. As a result, the locking portion 135 is formed concentrically with the connecting portion 134 and wider than the connecting portion 134. These creases 136a, 136b may be formed by pressing the cardboard into a line shape, but because these are areas that have a strong repulsive force when folded, it is preferable to use lead creases that include cutting lines to make assembly easier.

[0044] The second inner piece 137 is a portion disposed inside the second side wall 160 together with the first inner piece 131, and is formed to protrude outward from the first inner piece 131 via the connecting portion 134 and the locking portion 135 so as to be located at a position adjacent to the first side wall inner wall 126. In this case, the second inner piece 137 is formed at a distance from the first side wall inner wall 126. In addition, the opposing side 137a of the second inner piece 137 facing the first side wall inner wall 126 is formed at an incline so that the distance increases from the first inner piece 131 side toward the outside with respect to the first side wall inner wall 126. In this second inner piece 137, a part of the fitting opening 139 is formed at a position adjacent to the connecting portion 134 and the locking portion 135, and a second side wall engagement protrusion 138 is formed on the outer side 137b of the free end opposite to the connecting portion 134 and the locking portion 135.

[0045] The second sidewall engaging projection 138 is a portion for maintaining the folded state of the second inner piece 137 by being inserted into the second sidewall engaging through hole 114, and is formed to protrude in a rectangular shape in a plan view from the outer side edge 137b of the second inner piece 137. In this case, the protrusion amount of the second sidewall engaging projection 138 is formed to a length that penetrates the second sidewall engaging through hole 114 and protrudes from the bottom plate 110. In this embodiment, one second sidewall engaging projection 138 is formed on the first sidewall inner wall 126 side from the center of the outer side edge 137b of the second inner piece 137, but the formation position and the formation number can be set appropriately.

[0046] The fitting opening 139 is a portion for connecting the second sidewall component piece 130 and the second sidewall component piece 150 to each other by fitting a lock portion 155 formed in the second sidewall component piece 150 of the first sidewall 140 facing the first sidewall 120. This fitting opening 139 is configured by cutting out a portion between the connecting portion 134 and the lock portion 135 in a rectangular shape in a plan view. That is, the second sidewall component piece 130 and the second sidewall component piece 150 are formed to have an overlapping length that is longer than the distance between the first sidewall 120 and the first sidewall 140, in other words, half the width of the second sidewalls 160, 170, so that the lock portion 135 fits into the fitting opening 159 and the lock portion 155 fits into the fitting opening 139.

[0047] The first side wall 140, which forms a pair with the first side wall 120, is configured to include a first side wall outer wall 141, lines 142, 143, a first side wall ceiling portion 144, a line 145, a first side wall inner wall 146, a notch portion 147, a first side wall engaging protrusion 148, and a second side wall component piece 150, which are linearly symmetrical with the first side wall outer wall 121, lines 122, 123, a first side wall ceiling portion 124, a line 125, a first side wall inner wall 126, a notch portion 127, a first side wall engaging protrusion 128, and a second side wall component piece 130.

[0048] In this case, the second side wall component piece 150 is configured to include a first inner piece 151, lower edge 151a, inner handle portion 152, lines 153a, 153b, connecting portion 154, locking portion 155, lines 156a, 156b, second inner piece 157, opposing edge 157a, outer edge 157b, second side wall engagement protrusion 158, and engagement opening 159, which are linearly symmetrical to the first inner piece 131, lower edge 131a, inner handle portion 132, lines 133a, 133b, connecting portion 134, locking portion 135, lines 136a, 136b, second inner piece 137, opposing edge 137a, outer edge 137b, second side wall engagement protrusion 138, and engagement opening 139.

[0049] The second side walls 160, 170 are provided facing each other in another part of the outer periphery of the bottom plate 110, and are parts that constitute another part of the side wall surrounding the periphery of the contained object. The second side walls 160 and 170 are formed line-symmetrically with respect to the bottom plate 110 and have substantially the same shape, so the second side wall 160 will be mainly described.

[0050] The second side wall 160 mainly includes a second side wall outer wall 161, a second side wall ceiling portion 164, and a second side wall inner wall 166. The second side wall outer wall 161 is a portion constituting another part of the outer side wall of the container 180, and is formed in a substantially rectangular shape in a plan view that protrudes outward from the bottom plate 110. In this case, two side edges 161a at both ends in the longitudinal direction of the second side wall outer wall 161 are each formed by a curve that is concave toward the center of the second side wall outer wall 161.

[0051] A handle portion 162 is formed on the second sidewall outer wall 161, and is connected to the second sidewall ceiling portion 164 via a crease 163. The handle portion 162 is a portion into which a user who lifts the container 180 inserts his / her fingertips to support the container 180, and is configured as a long through hole. The handle portion 162 is formed at a position slightly above the center portion of the second sidewall outer wall 161. The handle portion 162 faces the inner handle portion 132 when the container-forming sheet body 100 is assembled into the container 180. The crease 163 is a portion for facilitating accurate folding of the second sidewall ceiling portion 164 relative to the second sidewall outer wall 161, and is formed linearly.

[0052] The second side wall ceiling portion 164 is a portion that constitutes the upper surface of the second side wall 160, and is formed in an elongated rectangular shape in a plan view that protrudes outward relative to the second side wall outer wall 161. As a result, the upper surface of the second side wall 160 is formed in an elongated flat shape. The second side wall ceiling portion 164 is formed with a second side wall inner wall 166 via a crease 165. The crease 165 is a portion that facilitates accurate folding of the second side wall inner wall 166 relative to the second side wall ceiling portion 164, and is formed in a linear shape.

[0053] The second side wall inner wall 166 is a part that constitutes another part of the inner side wall of the container 180, and is formed in a substantially rectangular shape in a plan view that protrudes outward from the second side wall outer wall 161 via the second side wall ceiling portion 164. This second side wall inner wall 166 has a notch portion 166a formed in the center on the outer side of the free end opposite the second side wall ceiling portion 164, and hook portions 167 are formed at the respective tips of the two side sides at both ends in the longitudinal direction of the second side wall inner wall 166.

[0054] The notch portion 166a is a portion for allowing a user to hook his / her fingers to easily remove the second side wall inner wall 166 from the first side walls 120, 140 when dismantling the container 180, and is formed in a semicircular recessed shape. The hook portion 167 is a portion for hooking onto the notch portion 127 formed in the first side wall 120 to fix the second side wall inner wall 166 in a folded state, and is formed in a hook shape protruding outward from each tip of two sides at both ends in the longitudinal direction of the second side wall inner wall 166.

[0055] Moreover, the second side wall inner wall 166 is formed with lines 168. The lines 168 are portions for facilitating deformation of the second side wall inner wall 166 when the second side wall inner wall 166 is attached to or detached from the first side walls 120, 140. Specifically, the lines 168 are formed extending linearly from the vicinity of two corners of the second side wall inner wall 166 on the second side wall ceiling portion 164 side toward the notch portion 166a. The lines 168 may have a weakening line function for facilitating deformation of the second side wall inner wall 166, and may be interrupted cut lines, so-called perforations, or the like.

[0056] The second side wall 170, which forms a pair with the second side wall 160, is configured to include a second side wall outer wall 171, side edge 161a, handle portion 162, line 163, second side wall ceiling portion 164, line 165, second side wall inner wall 166, cutout portion 166a, hook portion 167, and line 168, which are linearly symmetrical with the second side wall outer wall 161, side edge 161a, handle portion 162, line 163, second side wall ceiling portion 164, line 165, second side wall inner wall 166, cutout portion 166a, hook portion 167, and line 168.

[0057] (Operation of the container-forming sheet body 100) Next, the operation of the container-forming sheet body 100 configured as above will be described. First, a user of the container-forming sheet body 100 prepares the container-forming sheet body 100, which is made of a sheet of cardboard material and has one bottom plate 110, a pair of first side walls 120, 140, and a pair of second side walls 160, 170 formed thereon (see Figs. 1 and 2). In this case, the container-forming sheet body 100 can be formed using a known cutting device that cuts the sheet of cardboard material into any shape.

[0058] Next, the user assembles the container-forming sheet body 100 into a container 180. Specifically, as shown in FIG. 3, the user folds the creases 122 and 125 so that the first sidewall inner wall 126 of the first sidewall 120 overlaps the first sidewall outer wall 121. This allows the user to arrange the first sidewall inner wall 126 facing the first sidewall outer wall 121 in a state in which the first sidewall ceiling portion 124 has been formed. In this case, the user can easily fold the first sidewall inner wall 126 because the first sidewall inner wall 126 and the second inner piece 137 of the second sidewall constituent piece 130 are separated from each other. Next, the user folds the first sidewall inner wall 146 of the first sidewall 140 onto the first sidewall outer wall 141 in the same manner as the first sidewall inner wall 126.

[0059] Next, as shown in Fig. 4, the user folds the crease 111a so that the first side wall outer wall 121 of the first side wall 120 stands vertically relative to the bottom plate 110. In this case, the user inserts the two first side wall engagement protrusions 128 formed at the tip of the first side wall inner wall 126 into the two first side wall engagement through holes 113 formed in the bottom plate 110, respectively. This allows the user to stand the first side wall 120 relative to the bottom plate 110 in a state in which the rebound due to the springback (restoring force) of the first side wall inner wall 126 is restricted.

[0060] In this case, since the second side wall constituent piece 130 is formed connected to the first side wall outer wall 121, it stands up in the same manner as the first side wall outer wall 121. Also, since the side edge 161a of the second side wall 160 is formed concavely, the user can make the second side wall constituent piece 130 stand up while suppressing rubbing against the second side wall 160. Next, the user folds the first side wall outer wall 141 of the first side wall 140 so that it stands up against the bottom plate 110 in the same manner as the first side wall outer wall 121.

[0061] Next, as shown in FIG. 5, the user folds the two second sidewall constituent pieces 130 at the two creases 123 and rotates them toward the first sidewall inner wall 126 side, while folding the second inner piece 137 at the creases 133a, 133b and 136a, 136b, respectively, to place it opposite the first inner piece 131. In this case, the user inserts the second sidewall engagement protrusion 138 formed at the tip of the second inner piece 137 into the second sidewall engagement through hole 114 formed in the bottom plate 110. This allows the user to make the second sidewall constituent piece 130 stand up against the bottom plate 110 in a state where the rebound caused by the springback of the first inner piece 131 and the second inner piece 137 is restricted. In this case, the second sidewall constituent piece 130 extends and stands up in a direction perpendicular to the first sidewall 120 with the connecting portion 134 and the locking portion 135 formed, respectively.

[0062] In assembling the second side wall constituent piece 130, since the lower side 131a of the first inner piece 131 is inclined upward, the user can rotate the second side wall constituent piece 130 while suppressing rubbing against the second side wall 160. Furthermore, since the opposing side 137a of the second inner piece 137 is formed at an incline so as to be separated from the first side wall inner wall 126, the user can position the second inner piece 137 on the bottom plate 110 while suppressing the pressing of the second inner piece 137 against the first side wall inner wall 126, and can easily insert the second side wall engaging projection 138 into the second side wall engaging through hole 114. Furthermore, since the cut 114a is formed in the second side wall engaging through hole 114, the user can easily insert the second side wall engaging projection 138 by deforming the periphery of the second side wall engaging through hole 114.

[0063] Next, as shown in Fig. 6, the user folds the two second sidewall constituent pieces 150 at the two creases 142, respectively, in the same manner as the second sidewall constituent piece 130, and rotates them toward the first sidewall inner wall 146 side, while folding the second inner piece 157 at the creases 153a, 153b and creases 156a, 156b, respectively, to place it opposite the first inner piece 151. In this case, the user places the second sidewall constituent piece 150 on the bottom plate 110 so that the first inner piece 151 and the second inner piece 157 sandwich and cover the free end side (second sidewall constituent piece 150 side) of the second sidewall constituent piece 130. As a result, the locking portion 135 of the second sidewall constituent piece 130 fits into the fitting opening 159 of the second sidewall constituent piece 150, and the locking portion 155 fits into the fitting opening 139 of the second sidewall constituent piece 130.

[0064] Then, the user inserts the second sidewall engaging projection 158 formed at the tip of the second inner piece 157 into the second sidewall engaging through hole 114 formed in the bottom plate 110. This allows the user to make the second sidewall constituent piece 150 stand up against the bottom plate 110 in a state where the rebound caused by the springback of the first inner piece 151 and the second inner piece 157 is restricted with a part of the second sidewall constituent piece 150 fitted into a part of the second sidewall constituent piece 130. In this case, since the opposing edge 157a of the second inner piece 157 is formed at an incline so as to be separated from the first sidewall inner wall 146, the user can easily position the second inner piece 157 on the bottom plate 110 while suppressing the pressing force of the second inner piece 157 against the first sidewall inner wall 146, and easily insert the second sidewall engaging projection 138 into the second sidewall engaging through hole 114.

[0065] In this embodiment, the second sidewall component piece 150 is assembled after the second sidewall component piece 130 is assembled, but the second sidewall component piece 130 can also be assembled after the second sidewall component piece 150 is assembled. Also, the second sidewall component piece 130 and the second sidewall component piece 150 can be assembled simultaneously while one of them is disposed on the inside.

[0066] Next, as shown in Fig. 7, the user folds the second side wall 160 along the creases 112a, 163, and 165 to cover the second side wall constituent piece 130 and the second side wall constituent piece 150, respectively. In this case, the user can hook the two hook portions 167 into the respective cutout portions 127 of the first side walls 120 and 140 by slightly folding the two creases 168, respectively. This allows the user to erect the second side wall 160 on the bottom plate 110 in a state in which the second side wall constituent piece 130 and the second side wall constituent piece 150 are sandwiched between the second side wall outer wall 161 and the second side wall inner wall 166 while forming the second side wall ceiling portion 164. In this case, the handle portion 162 of the second side wall 160 is disposed opposite to and overlaps the inner handle portions 132, 152 of the second side wall constituent pieces 130, 150.

[0067] Next, the user folds the second side wall 170 so that it stands up against the bottom plate 110 in the same manner as the second side wall 160. This allows the user to assemble the container-forming sheet body 100 into a box-shaped container 180 that is open at the top.

[0068] Next, a user can use the container 180 as a container. Specifically, the user can transport or store the container 180 by placing an object to be contained on the bottom plate 110. In this case, the user can hold the container 180 by inserting a finger into the handle portion 162. In this case, since the handle portion 162 is formed so as to communicate with the inner handle portion 132, the user can hold the container 180 by inserting a finger into the inner handle portion 132 as well, and the contact area with the finger is increased, thereby preventing pressure on the finger and damage to the handle portion 162.

[0069] Next, the user can disassemble the container 180. Specifically, the user can unfold the container 180 and return it to the container-forming sheet body 100 by reversing the procedure for assembling the container-forming sheet body 100 into the container 180. In this case, the user can insert fingers into the notches 166a, 176a formed in the second side wall inner walls 166, 176 of the second side walls 160, 170 to remove the second side wall inner walls 166, 176 from the first side wall inner walls 126, 146 of the first side walls 120, 140.

[0070] As can be understood from the above description of the operation, according to the above embodiment, in the container-forming sheet body 100, the second inner pieces 137, 157 are not connected to the first side wall inner walls 126, 146 but are configured separately, so that the second side wall constituent pieces 130, 150 can be folded with less force relative to the first side walls 120, 140, thereby reducing the workload when assembling the container 180. Furthermore, the container-forming sheet body 100 can also facilitate the folding work of the first side wall inner walls 126, 146 relative to the first side wall outer walls 121, 141.

[0071] Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. In the description of each modification, the same reference numerals are used to designate the same parts as those in the above-described embodiment.

[0072] For example, in the above embodiment, the container-forming sheet body 100 is configured such that the second inner piece 137 in the first side wall 120 is separated from the first side wall inner wall 126, and the second inner piece 157 in the first side wall 140 is separated from the first side wall inner wall 146. However, the container-forming sheet body 100 may be configured such that the second inner pieces 137, 157 in at least one of the first side wall 120 and the first side wall 140 are separated from the first side wall inner walls 126, 146.

[0073] In the above embodiment, the second inner pieces 137, 157 and the first sidewall inner walls 126, 146 are formed in a state of being spaced apart from each other. However, it is also possible to form a cut between the second inner pieces 137, 157 and the first sidewall inner walls 126, 146 so that they are in contact with each other. This reduces the manufacturing burden of the container-forming sheet body 100 compared to the case where the second inner pieces 137, 157 and the first sidewall inner walls 126, 146 are formed in a state of being spaced apart from each other.

[0074] In the above embodiment, the opposing sides 137a, 157a of the second inner pieces 137, 157 are formed inclined from the first inner pieces 131, 151 side toward the outer sides 137b, 157b, which are the free ends, so as to be spaced apart from the first side-wall inner walls 126, 146. However, the opposing sides 137a, 157a of the second inner pieces 137, 157 can also be formed parallel to the first side-wall inner walls 126, 146 from the first inner pieces 131, 151 side toward the outer sides 137b, 157b, which are the free ends.

[0075] In the above embodiment, the locking portions 135, 155 are formed so as to be flush with each other in a plane extending horizontally between the first inner piece 131 and the second inner piece 137 when the container 180 is assembled. This makes it possible to prevent damage to the container 180 when the second side wall ceiling portions 164, 174 of the second side walls 160, 170 are strongly pressed against the locking portions 135, 155 due to the weight applied when the containers are stacked. However, the locking portions 135, 155 can also be formed in a mountain shape that is pointed upward.

[0076] 8(A), (B) and 9, the locking portion 135 can be formed such that the opening width on the locking portion 135, 155 side is wider than the opening width on the connecting portion 134, 154 side of the fitting opening 139, 159, and one of the lines 133b, 153b and 136b, 156b is formed within the opening width on the locking portion 135, 155 side to form a mountain shape with the lines 133b, 153b or 136b, 156b as the apex (ridge line). In this case, the other of the lines 133b, 153b and 136b, 156b may be formed within the opening width on the locking portion 135, 155 side of the fitting opening 139, 159 or outside the opening width.

[0077] In the second side wall constituent piece 130 shown in FIG. 8(A), a crease 133b is formed within the opening width of the fitting opening 139 on the locking portion 135 side. In the second side wall constituent piece 150 shown in FIG. 8(B), a crease 156b is formed within the opening width of the fitting opening 159 on the locking portion 155 side. As a result, the locking portion 135 is formed on the first inner piece 131 side with the crease 133b as its apex when the container 180 is assembled. In addition, the locking portion 155 is formed on the second inner piece 157 side with the crease 156b as its apex when the container 180 is assembled. Note that the locking portions 135 and 155 adjacent to each other when the container 180 is assembled may be formed at different positions in a staggered manner as described above, or may be formed so that their apexes are located on the same straight line.

[0078] 8(A), (B) and 9, the second side wall constituent piece 130, 150 is configured by partially separating the first inner piece 131, 151 and the second inner piece 137, 157, by providing a groove-shaped separation portion 190 that is cut out when it reaches the outer periphery of the second side wall constituent piece 130, 150. This makes it easier to fold the creases 133b, 153b and the creases 136b, 156b in the second side wall constituent piece 130, 150 when assembling the second side wall constituent piece 130, 150. The separation portion 190 can also be configured by a straight cutting line instead of a notch.

[0079] Furthermore, as shown in Figures 10 and 11, for example, the opening width of locking portion 135 can be made wider on the locking portion 135 side than the opening width on the connecting portion 134 side of mating opening 139, and a pair of lines 133b and 136b can be formed concentrically with respect to the opening width on the locking portion 135 side, and line 191 can be formed between the pair of lines 133b and 136b to form a mountain shape with line 191 as the apex (ridge line).

[0080] In the above embodiment, the first side wall inner wall 126, 146 does not have a portion that constitutes the second side wall 160, 170. However, at least one of the first side wall inner wall 126 and the first side wall inner wall 146 may have a portion that constitutes the second side wall 160, 170. Specifically, the first side wall inner wall 126 may have a third inner piece 192 formed from the side edge of the first side wall inner wall 126 via a crease 191, as shown in FIG. 12. This third inner piece 192 is disposed adjacent to the second inner piece 137 by folding the crease 191 during assembly of the container 180. Therefore, the second inner piece 137 is formed smaller by the size of the third inner piece 192 and is formed in a state separated from the third inner piece 192.

[0081] In the container 180 having such a third inner piece 192, the second side walls 160, 170 are assembled to the bottom plate 110, so that the second side wall inner walls 166, 176 press down the third inner piece 192. As a result, in the container 180, the first side wall inner walls 126 are fixed to the second side walls 160, 170, so that the rigidity of the first side walls 120, 140 can be improved.

[0082] In the above embodiment, the container-forming sheet body 100 is configured to include the first side wall engaging through hole 113, the second side wall engaging through hole 114, the first side wall engaging projections 128, 148, and the second side wall engaging projections 138, 158. However, the container-forming sheet body 100 may be configured by omitting at least one of the first side wall engaging through hole 113, the second side wall engaging through hole 114, the first side wall engaging projections 128, 148, and the second side wall engaging projections 138, 158.

[0083] In the above embodiment, the width of the first sidewall engaging through hole 113 is formed to be five times the length (width) of the thickness of the first sidewall inner sidewall 126, 146. This makes it easier for an operator to insert the first sidewall engaging protrusion 128, 148 into the first sidewall engaging through hole 113. In addition, the container 180 can increase the rigidity of the container 180 by the first sidewall inner sidewall 126, 146 pressing the second inner piece 137 by the restoring force of the creases 125, 145. However, the width of the first sidewall engaging through hole 113 only needs to be formed to be a width that allows the first sidewall engaging protrusion 128, 148 to be inserted therein, and only needs to be formed to be at least equal to or greater than the plate thickness of the first sidewall engaging protrusion 128, 148.

[0084] In the above embodiment, the width of the second sidewall engaging through hole 114 is formed to be twice the length (width) of the thickness of the second sidewall inner sidewall 166, 176. This makes it easier for the worker to insert the second sidewall engaging projection 138, 158 into the second sidewall engaging through hole 114. In addition, the second inner piece 137 presses the first sidewall inner sidewall 126, 146 via the second sidewall inner sidewall 166, 176 due to the restoring force of the lines 133a, 133b, 153a, 153b, thereby increasing the rigidity of the container 180. However, the width of the second sidewall engaging through hole 114 only needs to be formed to be a width that allows the second sidewall engaging projection 138, 158 to be inserted, and only needs to be formed to be at least equal to or greater than the plate thickness of the second sidewall engaging projection 138, 158.

[0085] In the above embodiment, the first side wall engaging projections 128, 148 and the second side wall engaging projections 138, 158 are formed to have a length that penetrates the bottom plate 110. As a result, when the containers 180 are stacked, the first side wall engaging projections 128, 148 and the second side wall engaging projections 138, 158 protruding from the lower surface of the bottom plate 110 of the upper container 180 are disposed inside the first side wall inner walls 126, 146 and the second side wall inner walls 166, 176 of the lower container 180, thereby preventing the stacked containers 180 from being displaced. However, the first side wall engaging projections 128, 148 and the second side wall engaging projections 138, 158 may also be formed to have a length that does not penetrate the bottom plate 110.

[0086] In the above embodiment, the container-forming sheet body 100 is configured to include the locking portions 135, 155. However, the container-forming sheet body 100 may be configured without the locking portions 135, 155. In this case, the second side wall constituent pieces 130 and the second side wall constituent pieces 150 may be formed to have lengths such that they do not overlap with each other when assembling the container 180. The container-forming sheet body 100 may also omit the fitting openings 139, 159. The container-forming sheet body 100 may also omit the connecting portions 134, 154.

[0087] In the above embodiment, the container-forming sheet body 100 is configured to include the inner handle portions 132, 152 and the handle portions 162, 172. However, the container-forming sheet body 100 may be configured without including at least one of the inner handle portions 132, 152 and the handle portions 162, 172.

[0088] In the above embodiment, the container-forming sheet body 100 is configured to include the first sidewall ceiling parts 124, 144 and the second sidewall ceiling parts 164, 174 formed in a flat shape. However, the container-forming sheet body 100 can also be configured to include the first sidewall ceiling parts 124, 144 and the second sidewall ceiling parts 164, 174 formed in a pointed mountain shape rather than in a flat shape. In this case, the container-forming sheet body 100 can be configured to omit one of the lines 122, 142 and the lines 125, 145, and to omit one of the lines 163, 173 and the lines 165, 175. In this case, the container-forming sheet body 100 can also be configured to omit one of the lines 133a, 133b, 153a, 153b and the lines 136a, 136b, 156a, 156b.

[0089] In the above embodiment, the container-forming sheet body 100 is made of a plate-like corrugated cardboard material. However, the container-forming sheet body 100 can be made of a plate-like body that can be bent by hand. Therefore, the container-forming sheet body 100 can also be made of a paper material (e.g., cardboard) or a resin material (e.g., plastic corrugated cardboard) other than the corrugated cardboard material.

[0090] In the above embodiment, the container-forming sheet body 100 is configured by forming the notches 166a, 176a in the second sidewall inner walls 166, 176 of the second side walls 160, 170, respectively. However, the container-forming sheet body 100 may be provided with notches corresponding to the notches 166a, 176a instead of or in addition to the second sidewall inner walls 166, 176. For example, the container-forming sheet body 100 may be configured by forming notches 137c, 157c in the outer edges 137b, 157b of the second inner pieces 137, 157 constituting the second sidewall constituent pieces 130, 150, respectively, as shown in FIG. 13. This allows the user to easily remove the second inner pieces 137, 157 from the bottom plate 110 by inserting their fingers into the notches 137c, 157c. In FIG. 13, reference numerals for parts that are not directly related to this modified example are omitted (the same applies to FIGS. 14 to 20).

[0091] In these cases, the cutouts 166a, 176a, 137c, and 157c may have radial cuts 200 formed on the inner peripheral surface recessed in an arc shape. This allows the inner peripheral portion of the cutouts 166a, 176a, 137c, and 157c to be easily deformed by the cuts 200 when the user inserts his or her finger into the cutouts 166a, 176a, 137c, and 157c, making the touch (touch feeling) to the finger softer and improving operability. It is needless to say that the container-forming sheet body 100 may be configured without the cutouts 166a, 176a, 137c, and 157c.

[0092] In the above embodiment, the inner handle portion 132, 152 and the handle portion 162, 172 are configured only with a through hole that is elongated in plan view. However, the inner handle portion 132, 152 and the handle portion 162, 172 can provide a gentle impact when the user grips them. For example, as shown in FIG. 13, the handle portion 162, 172 can be provided with a flap 201 that is movably connected to the second side wall outer wall 161, 171 through a part of the inner periphery of the through hole in the handle portion 162, 172. According to this, when a user inserts his / her hands into the inner handle portions 132, 152 and the handle portions 162, 172 to lift the container 180, the user can grasp the inner handle portions 132, 152 and the handle portions 162, 172 through the flap 201 by tilting the flap 201 toward the inner handle portions 132, 152, thereby making the impact when grasping gentler and improving operability.

[0093] The container-forming sheet body 100 in the above embodiment may also be configured to have lines for facilitating folding after dismantling the container 180. Specifically, the container-forming sheet body 100 has a line 202 and fasteners 203, 204, as shown in Fig. 13. Here, the line 202 is a portion for folding the container-forming sheet body 100 in two, and is formed in the center of the container-forming sheet body 100 in the longitudinal direction, extending linearly so as to penetrate the bottom plate 110 and the first side walls 120, 140.

[0094] The fasteners 203, 204 are portions for preventing the folded container-forming sheet body 100 from being opened and unfolded. Specifically, the fastener 203 is formed in a piece shape movably connected to the second sidewall outer walls 161, 171 in a state facing the through holes constituting the handle portions 162, 172. The fastener 204 is formed in a piece shape movably connected to the first sidewall outer walls 121, 141 in a state facing each of the through holes constituting the four first sidewall engagement through holes 113.

[0095] The container-forming sheet body 100 thus configured can be folded in two ways. In the first folding way, the user folds the container-forming sheet body 100 in two at the line 202 in the container-forming sheet body 100 that has been unfolded into a flat plate shape after dismantling the container 180, as shown in FIG. 14. This folds the container-forming sheet body 100 in two with the handle portion 162 and the handle portion 172 overlapping each other. Next, the user folds the fastener 203 of one of the handle portions 162 and 172 (or the handle portion 172) so that it overlaps the fastener 203 of the other handle portion, thereby preventing the container-forming sheet body 100 folded in two from opening.

[0096] 15, the user disassembles the container 180 and unfolds the container-forming sheet body 100 into a flat plate shape, and folds the container-forming sheet body 100 along the crease 111b to fold the first side wall 140 and the second side wall constituent piece 150 onto the bottom plate 110 and the second side walls 160, 170, respectively. Next, the user folds the container-forming sheet body 100 along the crease 111a to fold the first side wall 120 and the second side wall constituent piece 130 onto the bottom plate 110 and the second side walls 160, 170, respectively. In this case, the user may fold the first side wall 120 and the second side wall constituent piece 130 onto the bottom plate 110 and the second side walls 160, 170, respectively, by folding along the crease 111a, and then fold the first side wall 120 and the second side wall constituent piece 130 onto the bottom plate 110 and the second side walls 160, 170, respectively, by folding along the crease 111a. That is, the user folds the container-forming sheet body 100 into three along the longitudinal direction.

[0097] Next, the user folds the container-forming sheet body 100 in two along the line 202 as shown in Fig. 16. This results in the container-forming sheet body 100 being folded in four. Next, the user folds the fasteners 204 formed on each of the first sidewall outer walls 121, 141 so that they overlap the opposing fasteners 204, thereby preventing the first side walls 120, 140 from opening.

[0098] The container-forming sheet body 100 in the above embodiment may also be configured to have lines for facilitating dismantling and folding of the container 180. Specifically, the container-forming sheet body 100 has lines 205 and lines 206a and 206b, as shown in Fig. 17. Here, the line 205 is a portion for tearing the bottom plate 110 along one of the two diagonals of the rectangular bottom plate 110, and is configured by a linearly extending perforation.

[0099] The ruled line 205 is composed of a central portion 205a extending in the longitudinal direction in the central portion of the bottom plate 110, and diagonal portions 205b each extending from both ends of the central portion 205a toward one of two pairs of corners constituting a diagonal angle in the bottom plate 110. In this case, the central portion of the central portion 205a is bent and extended in a rectangular shape to form an insertion portion 205c connected to the bottom plate 110. The insertion portion 205c is a portion that forms a through hole through which a user inserts his or her hand. The insertion portion 205c has a ruled line 205d formed in the portion connected to the bottom plate 110, and is formed so as to be easily bent relative to the bottom plate 110.

[0100] The lines 206a and 206b are portions for folding the bottom plate 110 along the other of the two diagonals of the rectangular bottom plate 110, and are configured as linearly extending folds. The lines 206a and 206b extend from both ends of the central portion 205a toward the other two corners of the two pairs of corners that form the diagonals in the bottom plate 110, respectively.

[0101] The container-forming sheet body 100 thus configured can be folded from the state of the container 180. Specifically, as shown in Fig. 18, the user turns the container 180 to be disassembled over and pushes the insertion portion 205c formed in the center of the bottom plate 110 into the inside of the container 180 to tilt it down. Next, while holding the bottom plate 110 near the crease 111b with one hand (the left hand in the figure), the user inserts the other hand (the right hand in the figure) into the through-hole formed by tilting the insertion portion 205c and pulls it so as to tear the crease 205. As a result, the crease 205 is torn at the center portion 205a.

[0102] Next, as shown in Fig. 19, the user inserts one hand (the left hand in the figure) into the center part of the torn bottom plate 110 and pulls it so as to further tear the crease 205. This causes the crease 205 to tear at the two diagonal parts 205b in addition to the center part 205a. Next, as shown in Fig. 20, the user can collapse the container 180 and fold it into a flat plate by mountain-folding the creases 206a and 206b. [Explanation of symbols]

[0103] 100...container forming sheet body, 110... bottom plate, 111a, 111b... lines, 112a, 112b... lines, 113... first side wall engagement through hole, 114... second side wall engagement through hole, 114a... notch, 120,140...first side wall, 121,141...first side wall outer wall, 122,142...lines, 123,143...lines, 124,144...first side wall ceiling portion, 125,145...lines, 126,146...first side wall inner wall, 127,147...notch portion, 128,148...first side wall engagement projection, 130,150... second side wall constituent piece, 131,151... first inner piece, 131a,151a... lower side, 132,152... inner handle portion, 133a,133b,153a,153b... line, 134,154... connecting portion, 135,155... lock portion, 136a,136b,156a,156b... line, 137,157... second inner piece, 137a,157a... opposing side, 137b,157b... outer side, 137c,157c... notch portion, 138,158... second side wall engagement projection, 139,159... fitting opening, 160, 170... second side wall, 161, 171... second side wall outer wall, 161a, 171a... side edge, 162, 172... handle portion, 163, 173... line, 164, 174... second side wall ceiling portion, 165, 175... line, 166, 176... second side wall inner wall, 166a, 176a... cutout portion, 167, 177... hook portion, 168, 178... line, 180…container, 190: separation portion; 191: crease; 192: third inner piece; 200...notch, 201...flap, 202...line, 203, 204...fastener, 205...line, 205a...center portion, 205b...diagonal portion, 205c...insertion portion, 205d...line, 206a, 206b...line.

Claims

1. A bottom plate on which the contents are placed; A pair of first side walls that are respectively provided in opposing positions on a part of an outer periphery of the bottom plate and that constitute a part of a side wall that surrounds the periphery of the object to be contained; a second side wall that is provided between the pair of first side walls at the outer periphery of the bottom plate and constitutes another part of the side wall that surrounds the periphery of the contained object, and a single sheet body for forming a container is assembled into a box-shaped container that is open at the top, At least one of the pair of first side walls is A first side wall outer wall formed to protrude from the bottom plate; a first side wall inner wall formed to protrude from the first side wall outer wall to a side opposite the bottom plate; a second side wall component piece formed to protrude from the first side wall in a direction perpendicular to the protruding direction of the first side wall, The second sidewall component piece is a first inner piece formed to protrude from the first outer side wall in a direction perpendicular to a protruding direction of the first outer side wall, and folded against the first outer side wall when assembling the container, and disposed inside the second side wall; a second inner piece that projects from the first inner piece and is formed at a position adjacent to the first sidewall inner wall, and is folded relative to the first inner piece and disposed opposite the first inner piece when the container is assembled, The second inner piece is The first sidewall is not connected to the inner sidewall, and is separate from the inner sidewall. The two first side walls constituting the pair of first side walls are each having an outer wall for the first sidewall, an inner wall for the first sidewall, and a second sidewall component piece; The second side wall constituent pieces formed on the pair of first side walls, respectively, The containers are formed to have a length such that they overlap each other when assembled, and a lock portion formed on a free end side opposite to the first side wall outer wall between the first inner piece and the second inner piece; A container forming sheet body characterized in that it has an engagement opening adjacent to the lock portion between the first inner piece and the second inner piece and opening larger than the lock portion.

2. In the container forming sheet body described in claim 1, The lock portion is A container-forming sheet body characterized in that, when the container is assembled, the sheet body is formed into a planar shape extending horizontally between the first inner piece and the second inner piece.

3. The container-forming sheet body according to claim 1 or 2, The second inner piece is A container-forming sheet body, characterized in that it is formed apart from the first side wall inner wall.

4. A sheet body for forming a container according to any one of claims 1 to 3, The second inner piece is A sheet body for forming a container, characterized in that the opposing edge facing the first side wall inner wall is formed at an angle away from the first side inner wall toward the outside.

5. The container-forming sheet body according to any one of claims 1 to 4, The second inner piece is An engagement projection is provided on an outer side opposite to the first inner piece, the engagement projection extending outward. The bottom plate is A container-forming sheet body, characterized in that an engagement through hole into which the engagement protrusion is inserted is formed at a position adjacent to the second side wall.

6. The container-forming sheet body according to any one of claims 1 to 5, The second side wall is A through-hole-shaped handle portion is formed to serve as a handle when assembling the container, The second sidewall component piece is A container forming sheet body characterized in that an inner handle portion in the form of a through hole having the same size as or larger than the handle portion is formed at a position that overlaps with the handle portion when the container is assembled.

7. A bottom plate on which the contents are placed; A pair of first side walls that are respectively provided in opposing positions on a part of an outer periphery of the bottom plate and that constitute a part of a side wall that surrounds the periphery of the object to be contained; a second side wall that is provided between the pair of first side walls at the outer periphery of the bottom plate and constitutes another part of the side wall that surrounds the periphery of the contained object, and is formed in a box shape with an opening at the top, The container comprises: A container comprising the container-forming sheet body according to any one of claims 1 to 6.

Images