Container

Abstract

To provide a container capable of improving compressive strength in an assembled state.SOLUTION: A container (1) includes a bottom wall constituting part (11) having a substantially rectangular shape in plan view, and a pair of side wall parts (12, 13) facing each other and protruding upward from a pair of side edge parts of the bottom wall constituting part facing each other. The side walls include inner walls (side 12A, side 13A), outer walls (side 12B, side 13B) arranged to face the inner walls from outside and connecting walls (side 12C, side 13C) connecting the inner walls and the outer walls and extending in the vertical direction, and the bottom wall component includes a bottom wall reinforcing portion (41) projecting downward from a lower surface and an extending reinforcing portion (42) extending outward from an outer peripheral part of the bottom wall reinforcing portion to a position overlapping the connecting wall in the vertical direction and projecting downward at the same height as the bottom wall reinforcing portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a container. [Background technology]

[0002] Various foldable containers have been proposed. The foldable container described in Patent Document 1 has a rectangular shallow container and four side panels protruding upward from the sides of the shallow container, with each side panel having ribs appropriately positioned on its outer surface to reinforce the side panel. When the side panels are raised along the side edges of the shallow container, some of the reinforcing ribs come into contact with the opening edge at the top end of the shallow container. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 2-124890 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional configurations, when a container is assembled with each pair of opposing side panels standing upright and heavy objects are loaded onto it, the container does not have sufficient compressive strength, which can cause the side panels to deform and come loose from their engagement.

[0005] An object of one aspect of the present invention is to provide a container that can improve the compressive strength when assembled. [Means for solving the problem]

[0006] In order to solve the above problems, a container according to one embodiment of the present invention is a container comprising a bottom wall component that is approximately rectangular in a plan view, and a pair of side wall components that protrude upward from each of a pair of opposing side edges of the bottom wall component, wherein the side wall components have an inner wall component, an outer wall component that is arranged to face the inner wall component from the outside, and a connecting wall component that connects the inner wall component and the outer wall component and extends in the vertical direction, and the bottom wall component has a bottom wall reinforcing component that protrudes downward from its underside, and an extending reinforcing component that extends outward from the outer periphery of the bottom wall reinforcing component to a position that overlaps with the connecting wall component in the vertical direction, and protrudes downward at the same height as the bottom wall reinforcing component. [Effects of the Invention]

[0007] According to one aspect of the present invention, the compressive strength of the container in an assembled state can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an assembled state of a foldable container according to an embodiment of the present invention. [Figure 2] 2 is a perspective view showing a state in which one side of each of a first side wall portion and a second side wall portion of the container shown in FIG. 1 has been removed. [Figure 3] 1 is a perspective view showing a folded state of a foldable container according to an embodiment of the present invention. FIG. [Figure 4] 10 is a perspective view of a first engagement portion of a first side wall portion and a second engagement portion of a second side wall portion as viewed from the bottom side of the container. FIG. [Figure 5] FIG. 2 is a perspective view of the container shown in FIG. 1 placed with the bottom surface facing up. [Figure 6] 2 is a cross-sectional view taken along the X1-X1 arrows in FIG. 1. [Figure 7] FIG. 7 is an enlarged view of a portion A1 in FIG. 6. [Figure 8] 2 is a plan view of the container shown in FIG. 1. [Figure 9] 1. FIG. 9 is a cross-sectional view of the B1 portion shown in FIG. 1 taken along the X2-X2 arrows shown in FIG. [Figure 10] 9 is a cross-sectional view taken along the line X3-X3 of FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described in detail below with reference to Figures 1 to 10. The schematic configuration of a container 1 will be described with reference to Figures 1 to 4.

[0010] [Overview of Container 1] As shown in Fig. 1, the container 1 has a rectangular parallelepiped shape with an open top, and is foldable as shown in Fig. 3. The foldable container 1 is made of resin such as polypropylene.

[0011] [Configuration of bottom wall component 11] As shown in FIGS. 1 and 2, the container 1 includes a bottom wall component 11 having a bottom wall portion 11A, a pair of first side wall portions 12, and a pair of second side wall portions 13. The bottom wall component 11 is generally rectangular in plan view and is located at the bottom of the container 1. As shown in FIGS. 1 and 2, the bottom wall component 11 includes first bank portions 11B that protrude upward from a pair of opposing long side portions in the longitudinal direction of the side edges of the bottom wall portion 11A. The bottom wall component 11 also includes second bank portions 11C that protrude upward from opposing short side portions in the lateral direction of the bottom wall portion 11A and are taller than the first bank portions 11B.

[0012] The first bank portion 11B and the second bank portion 11C are provided on the side portion including the four corner portions of the bottom wall component 11 when viewed in plan, with multiple bank reinforcement portions 111 formed in the shape of rectangular ribs protruding outward from the inner wall portion so as to extend in the vertical direction.

[0013] 1 to 3, the container 1 includes a pair of first side walls 12 rotatably connected to each first bank portion 11B, and a pair of second side walls 13 rotatably connected to each second bank portion 11C. The first side walls 12 and the second side walls 13 are configured to be able to change states between an assembled state in which they are erected above the first bank portion 11B and the second bank portion 11C, respectively, and a folded state in which they are tilted toward the center of the bottom wall portion 11A and folded parallel to the bottom wall portion 11A.

[0014] 2, the length by which first bank portion 11B protrudes upward from bottom wall portion 11A is shorter than the length by which second bank portion 11C protrudes upward from bottom wall portion 11A. Furthermore, first engaged portion 15 of first bank portion 11B, which rotatably supports first side wall portion 12, is formed at a position lower than the position by which second engaged portion 16 of second bank portion 11C, which rotatably supports second side wall portion 13, is formed. Furthermore, each second bank portion 11C is provided so as to connect the inner surfaces of both longitudinal end portions of a pair of opposing first bank portions 11B, and the longitudinal length of first bank portion 11B is formed to be approximately the same as the length of the long side portion in the longitudinal direction of bottom wall portion 11A.

[0015] [Connection structure between first side wall portion 12, second side wall portion 13 and bottom wall constituent portion 11] 2 and 4, the first side wall 12 is provided with a plurality of first engaging portions 21 that protrude downward from the lower edge and are rotatably connected to the first engaged portions 15 of the first bank portion 11B. The second side wall 13 is provided with a pair of second engaging portions 22 that protrude downward from the lower edge and are rotatably connected to the second engaged portions 16 of the second bank portion 11C.

[0016] 4, each of the first engagement portions 21 on the outer sides in the longitudinal direction that protrude downward from the lower edge of the first side wall portion 12 has a first engagement protrusion 21A that protrudes along the longitudinal direction from the lower end of the side surface on the inner side in the longitudinal direction of the first side wall portion 12. In addition, the first engagement portion 21 in the longitudinal center that protrudes downward from the lower edge of the first side wall portion 12 has a pair of first engagement protrusions 21A that protrude along the longitudinal direction from the lower ends of the side surfaces on both longitudinal sides of the first side wall portion 12.

[0017] The first engaging protrusion 21A of each first engaging portion 21 is inserted into the first engaged portion 15 of the first bank portion 11B from above, and is held rotatably around an axis along the longitudinal direction of the first bank portion 11B. Therefore, each first engaging portion 21 is rotatably connected to the first engaged portion 15 via its respective first engaging protrusion 21A.

[0018] 4, each second engagement portion 22 protruding downward from the lower edge of the second side wall portion 13 has a second engagement protrusion 22A protruding along the longitudinal direction from the lower end of a side surface portion on the inner side in the longitudinal direction of the second side wall portion 13. The second engagement protrusion 22A is inserted into the second engaged portion 16 of the second bank portion 11C from above and is held rotatably about an axis along the longitudinal direction of the second bank portion 11C. Therefore, the second engagement portion 22 is rotatably connected to the second engaged portion 16 via the second engagement protrusion 22A.

[0019] [Configuration of the first outer wall portion 12B and the first connecting wall portion 12C] 1, 2, 4, and 5, first outer wall portions 12B, which are elongated in the vertical direction and have a rectangular shape in a front view, are arranged on both longitudinal edge portions of the first side wall portion 12 so as to face from the outside the first inner wall portion 12A of the first side wall portion 12. In addition, a pair of flat first connecting wall portions 12C are provided that extend in the vertical direction and connect the first inner wall portion 12A and both vertically parallel edge portions of the first outer wall portion 12B.

[0020] The lower ends of the first outer wall portion 12B and the pair of first connecting wall portions 12C are flush with the lower end of the first inner wall portion 12A. As shown in FIGS. 1 and 2, when the first side wall portion 12 is raised, the lower end of the first side wall portion 12 abuts against the upper end of the first bank portion 11B. As shown in FIG. 4, the side surface of the first engaging portion 21 on the outer side of the first side wall portion 12 in the longitudinal direction is formed to be continuous with the first connecting wall portion 12C on the inner side of the first side wall portion 12 in the longitudinal direction. That is, of the pair of first connecting wall portions 12C, the inner first connecting wall portion 12C is formed to be continuous with the first engaging portion 21 in the vertical direction and is positioned so as to overlap the first engaging portion 21 in the vertical direction.

[0021] [Configuration of second outer wall portion 13B and second connecting wall portion 13C] 1, 2, 4, and 5, the second side wall 13 has a second outer wall 13B that is elongated in the vertical direction and has a rectangular shape in a front view, and is disposed longitudinally inward of the position facing the side edge of each first side wall 12, so as to face the second inner wall 13A of the second side wall 13 from the outside. A pair of flat second connecting walls 13C is also provided that extend vertically and connect both side edges of the second inner wall 13A and the second outer wall 13B that are parallel to the vertical direction. The lower ends of the second outer wall 13B and the pair of second connecting walls 13C are disposed so as to be flush with the lower ends of the second inner wall 13A.

[0022] [Configuration of protrusion 25] 4, the side surface of the second engagement portion 22 on the outer side in the longitudinal direction of the second side wall portion 13 is formed to be continuous in the vertical direction with the second connection wall portion 13C on the inner side in the longitudinal direction of the second side wall portion 13. In other words, of the pair of second connection walls 13C, the inner second connection wall portion 13C is formed to be continuous in the vertical direction with the second engagement portion 22 and is disposed at a position overlapping the second engagement portion 22 in the vertical direction. In addition, a protrusion 25 that is L-shaped in a plan view and protrudes downward (upward in FIG. 4) is provided on the lower end of the second inner wall portion 13A and the lower end of the second connection wall portion 13C on the outer side of the second engagement portion 22.

[0023] The portion of protrusion 25 that protrudes downward from the lower end of second connecting wall 13C is positioned slightly inward of second outer wall 13B to avoid interference with fitting protrusion 28 (see FIG. 2), which will be described later, when second side wall 13 rotates. Therefore, protrusion 25 is positioned so as to overlap second inner wall 13A and second connecting wall 13C in the up-down direction.

[0024] [Configuration of Receptor 27] 2 and 3, receiving portions 27 are provided on the upper end surfaces of both longitudinal ends of the second bank portion 11C of the bottom wall constituent portion 11. The receiving portions 27 are recessed and have a generally L-shape in plan view, and receive extending reinforcing portions 42 (see FIG. 5) provided on the underside of each corner of the bottom wall constituent portion 11 when the folded containers 1 are stacked. The receiving portions 27 are provided with fitting protrusions 28 that protrude upward from the outer edge of the generally L-shape in plan view of the receiving portion 27, and against which the edge portions of the underside of each corner of the bottom wall constituent portion 11 abut when the folded containers 1 are stacked.

[0025] Here, the height of fitting protrusion 28 from receiving portion 27 is set to be approximately the same as the vertical height of protrusion 25 provided at the base end of second engagement portion 22 of second side wall 13. Therefore, when second side wall 13 is raised above second bank portion 11C, the lower end of protrusion 25 abuts against the upper surface of receiving portion 27, and the lower end surface of second side wall 13 abuts against the upper end of fitting protrusion 28 (see FIG. 9).

[0026] [Configuration of side wall engagement portion 31] 1 and 2, each second side wall 13 is provided with a pair of side wall engagement portions 31 that are generally rectangular in front view and protrude inward from both longitudinal side edges of the container 1. An insertion hole 31A that is generally rectangular in cross section and penetrates the second side wall 13 in the longitudinal direction is provided in the center of each side wall engagement portion 31. The side wall engagement portion 31 also has a generally vertically elongated rectangular opening (not shown) at the inner base end, into which an operation bar 32 that protrudes from both longitudinal sides of the first side wall 12 is inserted.

[0027] 2, on both sides of the outer surface of the first side wall 12, there are provided side wall engaging portions 33 that abut or are close to the side wall engaging portions 31 of the second side wall 13 when the container 1 is assembled. The side wall engaging portions 33 are configured to reduce the thickness of the outer surface of the first side wall 12, and are configured so that the total thickness of the side wall engaging portions 31 and the side wall engaging portions 33 overlapping each other is approximately equal to the thickness of the first side wall 12.

[0028] 1 and 2, both sides of first side wall 12 are provided with insertion protrusions 33A that protrude outward with a generally rectangular cross section from the outer surface of side wall engaging portion 33 and that are inserted into insertion holes 31A of side wall engaging portion 31 when container 1 is assembled. With this configuration, when container 1 is assembled, first side wall 12 and second side wall 13 are prevented from tilting outward of container 1, and relative displacement in the vertical direction between first side wall 12 and second side wall 13 is restricted.

[0029] [Configuration of operation panel and operation bar] 2, a pair of operation bars 32 protrude from above both sides of the pair of first side wall portions 12. When the container 1 is in an assembled state, the pair of operation bars 32 are inserted into openings (not shown) provided at the inner base ends of the side wall engagement portions 31. When the container 1 is in an assembled state, the pair of operation bars 32 are configured to be displaceable between a protruding position where they are inserted into and locked into openings (not shown) provided at the inner base ends of the side wall engagement portions 31, and a retracted position where they come out of the openings (not shown) and are released from the locked state.

[0030] The pair of operation bars 32 are operated by pressing an operation unit 35 shown in Figures 1 and 2. The operation unit 35 is provided above the inner surfaces of the pair of first side wall portions 12, and approximately in the center in the left-right direction when viewed from the front. The position where the operation unit 35 is provided is not limited to this, and it may be provided in a position that is easy for the user of the container 1 to operate. The operation unit 35 can displace the pair of operation bars 32 from the protruding position to the retracted position with a single pressing operation.

[0031] [Folding and assembly instructions] When the assembled container 1 is to be folded, the operating portions 35 of the pair of first side walls 12 are pressed down to displace the operating bars 32 to the retracted positions, causing the pair of first side walls 12 to assume the folded position, and then the pair of second side walls 13 are displaced to the folded position as shown in Fig. 3. In the folded state of the container 1, the first side walls 12 in the folded position overlap the top of the bottom wall 11A, and the second side walls 13 in the folded position overlap the top of the first side walls 12.

[0032] The pair of first side wall portions 12 in the folded position are supported by contacting the bottom wall portion 11A, and the pair of second side wall portions 13 in the folded position are supported by contacting the pair of first side wall portions 12. Therefore, when the container 1 is changed from the folded position to the assembled position, the pair of second side wall portions 13 are first raised and then the pair of first side wall portions 12 are raised to achieve the assembled position.

[0033] Alternatively, the operation bar 32 and the operation unit 35 may be provided on each of the pair of second side wall portions 13, and the side wall engagement units 31 may be provided on both side edges of each of the pair of first side wall portions 12. When the assembled container 1 is to be folded, the operation units 35 of the pair of second side wall portions 13 may be pressed down to displace the operation bars 32 to the retracted positions, and the pair of second side wall portions 13 may be placed in the folded position, and then the pair of first side wall portions 12 may be displaced to the folded position.

[0034] [Configuration of bottom wall reinforcement portion 41 and extension reinforcement portion] 5, the bottom wall 11A of the container 1 is provided with a bottom wall reinforcing portion 41 that protrudes downward from the lower surface of a generally rectangular shape in plan view, located on the inner circumferential side of the area where the first bank portion 11B and the second bank portion 11C are formed. The bottom wall reinforcing portion 41 is provided with diagonal lattice-shaped ribs inside a peripheral rib portion 41A that is generally rectangular in plan view. Four extending reinforcing portions 42 that extend outward from the outer peripheral surface of the four corners of the peripheral rib portion 41A of the bottom wall reinforcing portion 41 and protrude downward are provided.

[0035] The extending reinforcement portion 42 is composed of outer wall rib portions 42A that are generally L-shaped in plan view and are provided to surround the outer peripheral surface of the four corners of the outer peripheral rib portion 41A at a predetermined interval, and reinforcement ribs 42B that connect each of the four corners of the outer peripheral rib portion 41A to the inner surface of the outer wall rib portion 42A. The bottom wall reinforcement portion 41 and the extending reinforcement portion 42 protrude downward at the same height from the underside of the bottom wall constituent portion 11, which includes the bottom wall portion 11A. The bottom wall reinforcement portion 41 and the extending reinforcement portion 42 abut against the installation surface of the container 1.

[0036] [Positional Relationship Between the First Connecting Wall 12C and the Second Connecting Wall 13C and the Extended Reinforcement 42] Next, the vertical positional relationship between the first connecting wall portion 12C and the second connecting wall portion 13C and the extending reinforcement portion 42 in the assembled state of the container 1 configured as described above will be described with reference to FIGS. 6 and 7. As shown in FIG. 6, in the assembled state of the container 1, the first outer wall portion 12B of each first side wall portion 12 and the pair of first connecting wall portions 12C connecting both vertically aligned edge portions of the first outer wall portion 12B to the first inner wall portion 12A are provided at corners of the container 1. In addition, in the assembled state of the container 1, the second outer wall portion 13B of each second side wall portion 13 and the pair of second connecting wall portions 13C connecting both vertically aligned edge portions of the second outer wall portion 13B to the second inner wall portion 13A are provided at corners of the container 1.

[0037] The vertical positional relationship between the first connecting wall 12C and the second connecting wall 13C and the extending reinforcement 42 at each corner of the container 1 is the same, so the corner at part A1 in Fig. 6 will be described with reference to Fig. 7. As shown in Fig. 7, the outer wall rib 42A of the extending reinforcement 42 overlaps with the pair of first connecting wall 12C of the first side wall 12 in the vertical direction and extends outward from the outer peripheral rib 41A of the bottom wall reinforcement 41 so as to overlap with the pair of second connecting wall 13C of the second side wall 13 in the vertical direction.

[0038] Thus, by providing first side wall portion 12 with first inner wall portion 12A, first outer wall portion 12B, and first connecting wall portion 12C, first side wall portion 12 can be reinforced. By providing second side wall portion 13 with second inner wall portion 13A, second outer wall portion 13B, and second connecting wall portion 13C, second side wall portion 13 can be reinforced. Furthermore, since extending reinforcement portion 42 that abuts against the installation surface of container 1 is provided at a position that overlaps with pair of first connecting wall portions 12C and pair of second connecting wall portions 13C in the up-down direction, the compressive strength of container 1 can be improved.

[0039] Furthermore, outer wall rib portion 42A of extending reinforcement portion 42, i.e., the outer periphery, overlaps with pair of first connecting wall portions 12C and pair of second connecting wall portions 13C in the vertical direction, thereby further improving the compressive strength of container 1. Furthermore, first outer wall portion 12B and pair of first connecting wall portions 12C, and second outer wall portion 13B and pair of second connecting wall portions 13C are provided at corner portions of container 1 that are susceptible to load when stacked, thereby further improving the compressive strength of container 1.

[0040] For example, the outer wall rib portion 42A of the extending reinforcement portion 42 may be configured to extend outward from the outer peripheral rib portion 41A of the bottom wall reinforcement portion 41 so as to vertically overlap only one of the pair of first connecting wall portions 12C and the pair of second connecting wall portions 13C. This allows the extending reinforcement portion 42, which abuts against the installation surface of the container 1, to be positioned so as to vertically overlap one of the pair of first connecting wall portions 12C and the pair of second connecting wall portions 13C, thereby improving the compressive strength of the container 1.

[0041] Furthermore, for example, the outer wall rib 42A of the extending reinforcement portion 42 may be configured to extend outward from the outer peripheral rib 41A of the bottom wall reinforcement portion 41 so as to overlap in the vertical direction with the first connecting wall portion 12C of the pair of first connecting wall portions 12C on the corner side of the first side wall portion 12 and the second connecting wall portion 13C of the pair of second connecting wall portions 13C on the corner side of the second side wall portion 13. In this way, the extending reinforcement portion 42 that abuts on the installation surface of the container 1 is positioned so as to overlap in the vertical direction with the first connecting wall portion 12C of the corner side and the second connecting wall portion 13C of the corner side, thereby improving the compressive strength of the container 1.

[0042] [The second connecting wall portion 13C overlaps with the bank reinforcing portion 111 in the vertical direction via the protruding portion 25] Next, a configuration in which the outer second connecting wall 13C of a pair of second connecting walls 13C arranged at the corners of the second side wall 13 overlaps in the vertical direction with the bank reinforcement 111 provided at the corner of the second bank 11C via the protrusion 25 will be described with reference to Figures 1, 8, and 9. As shown in Figures 1 and 8, in the assembled container 1, the configurations of both corners of the second side wall 13 and the second bank 11C are substantially the same. Therefore, the configuration of one corner of the second side wall 13 and the second bank 11C in the cross section taken along the arrows X2-X2 in Figure 8 will be described with reference to Figure 9.

[0043] 9, of the pair of second connecting walls 13C, the second connecting wall 13C on the corner side (right side in FIG. 9) abuts against the upper surface of the receiving portion 27 via a protruding portion 25 inserted into the receiving portion 27. In addition, the protruding portion 25 is located directly above the rib-shaped bank reinforcement portions 111 of the second bank portion 11C that are provided in the up-down direction from the lower surface of the receiving portion 27. Therefore, at both corners of the second bank portion 11C, at least some of the multiple rib-shaped bank reinforcement portions 111 are positioned so as to overlap in the up-down direction with the second connecting wall 13C of the second side wall 13 via the protruding portion 25 and the receiving portion 27.

[0044] This causes second connecting wall 13C and at least a portion of rib-shaped bank reinforcement 111 to overlap in the vertical direction, further improving the compressive strength of container 1. Furthermore, protruding portion 25 inserted into receiving portion 27 is positioned so as to overlap second inner wall 13A and second connecting wall 13C on the corner side in the vertical direction, further improving the compressive strength of container 1 in an assembled state.

[0045] [The side wall engaging portion 31 overlaps with the first outer wall portion 12B and the first connecting wall portion 12C in the vertical direction] Next, the configuration in which side wall engaging portion 31 overlaps first outer wall portion 12B and first connecting wall portion 12C in the vertical direction will be described with reference to Figures 1, 8, and 10. As shown in Figures 1 and 8, in the assembled container 1, the configuration in which side wall engaging portion 31 engages with side wall engaged portion 33 is substantially the same, so the configuration of the cross section taken along the X3-X3 arrows in Figure 8 will be described with reference to Figure 10.

[0046] As shown in FIGS. 1 and 10 , the upper ends of the first outer wall portion 12B and the pair of first connecting wall portions 12C of the first side wall portion 12 are positioned facing each other below the lower ends of the sidewall engagement portions 31 of the second sidewall portion 13. This prevents interference between the sidewall engagement portions 31 and the first outer wall portion 12B and the pair of first connecting wall portions 12C when the first sidewall portion 12 is in an upright position. Furthermore, by positioning the first outer wall portion 12B and the pair of first connecting wall portions 12C below the sidewall engagement portions 31, the sidewall engagement portions 31 can be reinforced. As a result, it is possible to prevent the second sidewall portion 13 from deforming near the sidewall engagement portions 31, which could cause disengagement between the first sidewall portion 12 and the second sidewall portion 13, and it is also possible to suppress damage and deformation of the sidewall engagement portions 31.

[0047] 10, the first outer wall portion 12B and the first connecting wall portion 12C of the first side wall portion 12 are disposed adjacent in the vertical direction to the first engaging portion 21 that engages with the first engaged portion 15 provided on the first bank portion 11B. As a result, the first outer wall portion 12B and the first connecting wall portion 12C are disposed adjacent in the vertical direction to the first engaging portion 21, and therefore damage or deformation of the first engaging portion 21 due to deformation of the first side wall portion 12 can be suppressed.

[0048] The first outer wall portion 12B and the first connecting wall portion 12C of the first side wall portion 12 may be disposed at a position overlapping in the vertical direction with the first engaging portion 21. In this way, the first outer wall portion 12B and the first connecting wall portion 12C are disposed at a position overlapping in the vertical direction with the first engaging portion 21, and therefore damage or deformation of the first engaging portion 21 due to deformation of the first side wall portion 12 can be suppressed.

[0049] [Variations] A modification of the above embodiment will be described. In the following description, for the sake of convenience, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0050] [Variation 1] For example, the first outer wall portion 12B of each first side wall portion 12 and the pair of first connecting wall portions 12C connecting both side edges of the first outer wall portion 12B along the up-down direction to the first inner wall portion 12A may be provided at any position, such as the longitudinal center of the first side wall portion 12, rather than at the corners of the container 1. Furthermore, the rib-shaped bank reinforcing portion 111 of the first bank portion 11B may be provided at a position overlapping with the first connecting wall portion 12C in the up-down direction, such as the longitudinal center of the first bank portion 11B, rather than at the corners of the bottom wall forming portion 11.

[0051] Furthermore, the second outer wall portion 13B of each second side wall portion 13 and the pair of second connecting wall portions 13C connecting both vertically aligned side edges of the second outer wall portion 13B to the second inner wall portion 13A may be provided at any position, such as the longitudinal center of the second side wall portion 13, rather than at the corners of the container 1. Furthermore, the rib-shaped bank reinforcing portion 111 of the second bank portion 11C may be provided at a position overlapping the second connecting wall portion 13C in the vertical direction, such as the longitudinal center of the second bank portion 11C, rather than at the corners of the bottom wall forming portion 11. This allows the compressive strength of the container 1 to be further improved.

[0052] [Variation 2] For example, the container 1 does not have to have a folding structure. Specifically, the container 1 may include a bottom wall 11A that is generally rectangular in plan view, a pair of first fixed side walls 62, and a pair of second fixed side walls 63. The first fixed side walls 62 may extend upward from a pair of opposing long side edges in the longitudinal direction of the bottom wall 11A. The second fixed side walls 63 may extend upward from a pair of opposing short side edges in the lateral direction of the bottom wall 11A that is generally rectangular in plan view.

[0053] Each of the pair of first fixed side walls 62 and the pair of second fixed side walls 63 may have an inner wall portion and an outer wall portion that is rectangular in front view and long in the vertical direction so as to face the inner wall portion from the outside, at a corner of the container 1. Each of the pair of first fixed side walls 62 and the pair of second fixed side walls 63 may have a pair of flat connecting walls that extend in the vertical direction and connect both side edges of each inner wall portion and each outer wall portion that are parallel to the vertical direction.

[0054] Alternatively, upper flange portions may extend horizontally outward from the upper ends of the first fixed side walls 62 and the second fixed side walls 63 to positions where they overlap with the respective outer wall portions in the vertical direction, and may be provided around the entire periphery of the opening. Alternatively, lower flange portions may extend horizontally outward from the lower ends of the first fixed side walls 62 and the second fixed side walls 63 to positions where they overlap with the respective outer wall portions in the vertical direction, and may be provided around the entire periphery of the bottom wall 11A. Alternatively, the upper ends of the respective outer wall portions may be connected to the lower surfaces of the upper flange portions, and the lower ends may be connected to the upper surfaces of the lower flange portions.

[0055] In addition, four extending reinforcement portions 42 may be provided at the four corners of bottom wall reinforcement portion 41 provided on the underside of bottom wall portion 11A, extending outward from the outer peripheral surface of outer peripheral rib portion 41A and protruding downward from the underside of the lower flange portion. Bottom wall reinforcement portion 41 and extending reinforcement portion 42 protrude downward at the same height from the underside of bottom wall portion 11A and the lower flange portion. Bottom wall reinforcement portion 41 and extending reinforcement portion 42 abut against the installation surface of container 1.

[0056] Furthermore, the outer wall rib portion 42A of each extending reinforcement portion 42 at each corner of the container 1 may be configured to extend outward from the outer peripheral rib portion 41A of the bottom wall reinforcement portion 41 so as to overlap in the vertical direction with each pair of connecting wall portions of each first fixed side wall portion 62 and each second fixed side wall portion 63. In this way, the extending reinforcement portion 42 that abuts on the installation surface of the container 1 is positioned to overlap in the vertical direction with each pair of connecting wall portions of each first fixed side wall portion 62 and each second fixed side wall portion 63, thereby improving the compressive strength of the container 1.

[0057] [Variation 3] Also, for example, each rib-shaped bank reinforcement portion 111 provided at the corner portion of the container 1 may be made to protrude downward from the lower surface of the bottom wall constituent portion 11. Each bank reinforcement portion 111 and the extending reinforcement portion 42 may be integrated and may protrude downward at the same height from the lower surface of the bottom wall constituent portion 11 to abut against the installation surface of the container 1. This can further improve the compressive strength of the container 1.

[0058] Furthermore, for example, each rib-shaped bank reinforcing portion 111 provided at the corner portion of the container 1 and the reinforcing rib 42B of the extending reinforcing portion 42 provided on the underside of the bottom wall constituent portion 11 may be provided so as to be continuous in the vertical direction. This can further improve the compressive strength of the container 1.

[0059] Furthermore, for example, an outer wall portion facing the inner wall portion may be provided on the outer side of the bank reinforcement portion 111 provided at the corners of the first bank portion 11B and the second bank portion 11C to form a cylindrical shape. This outer wall portion may be provided so as to be continuous in the vertical direction with the outer wall rib portion 42A of the extension reinforcement portion 42 provided on the underside of the bottom wall constituent portion 11. This can further improve the compressive strength of the container 1.

[0060] [Variation 4] Furthermore, for example, protrusion 25 provided at the base end of second engagement portion 22 may be provided to protrude downward (upward in FIG. 4) in a U-shape in plan view. Specifically, protrusion 25 may be provided to protrude downward (upward in FIG. 4) in a U-shape in plan view from the lower end of the portion of second inner wall portion 13A facing second outer wall portion 13B shown in FIG. 4, the lower end of second connecting wall portion 13C on the outer side of second engagement portion 22, and the lower end of second outer wall portion 13B.

[0061] In this case, a notch may be provided in the fitting protrusion 28 to avoid interference between the protrusion 25 and the fitting protrusion 28 when the second side wall 13 rotates. Alternatively, the second outer wall 13B may be positioned inward to avoid interference between the protrusion 25 and the fitting protrusion 28 when the second side wall 13 rotates. This can further improve the compressive strength of the container 1.

[0062] [Variation 5] Furthermore, for example, the first outer wall portion 12B and the pair of first connecting wall portions 12C may be formed above each first engaging portion 21 on the longitudinal outer side of the first side wall portion 12 by a molding method using gas injection or a molding method in which a mold is removed from the upper surface side of the first side wall portion 12. This makes it possible to mold each first engaging portion 21 so as to have a pair of first engaging protrusions 21A that protrude along the longitudinal direction from the lower ends of the side surfaces on both longitudinal sides of the first side wall portion 12. Furthermore, the strength of the first engaging portions 21 can be increased to prevent breakage.

[0063] Additionally, the second outer wall portion 13B and the pair of second connecting wall portions 13C may be formed above each second engaging portion 22 of the second side wall portion 13 by a molding method using gas injection or a molding method in which a mold is removed from the upper surface side of the second side wall portion 13. This makes it possible to mold each second engaging portion 22 so as to have a pair of second engaging protrusions 22A that protrude along the longitudinal direction from the lower ends of the side surfaces on both longitudinal sides of the second side wall portion 13. Furthermore, the strength of the second engaging portions 22 can be increased to prevent breakage.

[0064] [Variation 6] For example, the first outer wall portion 12B and the first connecting wall portion 12C of the first side wall portion 12 may extend to the upper end surface of the first side wall portion 12. The second outer wall portion 13B and the second connecting wall portion 13C of the second side wall portion 13 may extend to the upper end surface of the second side wall portion 13. In such a case, the mold may be designed to be removed not only from the lower surface side of the first side wall portion 12 and the second side wall portion 13 but also from the upper surface side. Furthermore, horizontal ribs may be provided in the interior surrounded by the first inner wall portion 12A, the first outer wall portion 12B, and the pair of first connecting walls 12C, and in the interior surrounded by the second inner wall portion 13A, the second outer wall portion 13B, and the pair of second connecting walls 13C. This further improves the compressive strength of the container 1.

[0065] [Variation 7] Furthermore, for example, the first engaging portions 21 and the first connecting wall portions 12C of the first side wall portion 12 may not be continuous, and the lower end surfaces of the pair of first connecting wall portions 12C may abut against the upper surfaces of the first bank portions 11B when the first side wall portion 12 is assembled. The second engaging portions 22 and the second connecting wall portions 13C of the second side wall portion 13 may not be continuous, and the lower end surfaces of the pair of second connecting wall portions 13C may abut against the upper surfaces of the second bank portions 11C when the second side wall portion 13 is assembled. The protrusions 25 may also be formed in a square shape when viewed from above.

[0066] Furthermore, in such a case, one or both of the pair of first connecting walls 12C may be arranged to overlap the bank reinforcement portion 111 of the first bank portion 11B in the vertical direction. Also, one or both of the pair of second connecting walls 13C may be arranged to overlap the bank reinforcement portion 111 of the second bank portion 11C in the vertical direction. This can further improve the compressive strength of the container 1.

[0067] [Variation 8] The configurations of the above-described "Variation 3," "Variation 4," and "Variation 7" may be combined so that at least one of the second outer wall portion 13B and the second connecting wall portion of the second side wall portion 13, the protruding portion 25, the bank reinforcement portion 111 of the second bank portion 11C, and the extending reinforcement portion 42 all overlap in the vertical direction. This can further improve the compressive strength of the container 1.

[0068] [Additional Notes] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0069] 1 container 11 Bottom wall component 11A Bottom wall part 11B First bank 11C Second bank 12 First side wall portion 13 Second side wall 12A, 13A inner wall 12B, 13B External wall part 12C, 13C connecting wall 21 First engagement portion 22 second engagement portion 25 Protrusion 27 Receptor 31 Side wall engagement portion 41 Bottom wall reinforcement 42 Extension reinforcement part 111 Bank reinforcement section

Claims

1. A container comprising a bottom wall component having a generally rectangular shape in a plan view, and a pair of side wall components projecting upward from a pair of opposing side edges of the bottom wall component, The side wall portion is An inner wall portion; an outer wall portion disposed so as to face the inner wall portion from the outside; a connecting wall portion that connects the inner wall portion and the outer wall portion and extends in the vertical direction; and The bottom wall component is a bottom wall reinforcing portion protruding downward from the lower surface; an extending reinforcement portion that extends outward from the outer periphery of the bottom wall reinforcement portion to a position where it overlaps with the connecting wall portion in the vertical direction and protrudes downward at the same height as the bottom wall reinforcement portion; A container having:

2. The extending reinforcement portion extends outward so as to overlap with at least two connecting wall portions in the vertical direction. The container of claim 1.

3. the bottom wall component has bank portions that protrude upward from each of the pair of opposing side edge portions, The bank portion has a plurality of rib-shaped bank reinforcing portions provided so as to extend in the vertical direction, At least some of the plurality of rib-shaped bank reinforcement portions are arranged in positions overlapping with the connecting wall portion in the vertical direction. The container of claim 1.

4. Each pair of opposing side wall portions is rotatably connected to each of the bank portions, and can be changed between a folded state in which each pair of opposing side wall portions is folded by rotating each pair of opposing side wall portions inward, and an assembled state in which each pair of opposing side wall portions is erected from the folded state, the bank portion has a receiving portion on an upper surface thereof that receives the extending reinforcement portion when the containers in the folded state are stacked, the side wall portion has a protrusion that protrudes downward from a lower surface in the assembled state and is inserted into the receiving portion, The protrusion is disposed at a position overlapping in the up-down direction with at least one of the inner wall, the outer wall, and the connecting wall.

4. The container of claim 3.

5. The outer wall portion and the connecting wall portion are provided at least at corner portions of the container. A container according to any one of claims 1 to 4.

6. the side wall portion has an engaging portion that can be engaged with the bottom wall constituent portion, The outer wall portion and the connecting wall portion are arranged at a position overlapping the engaging portion in the vertical direction or at a position adjacent to the engaging portion. A container according to any one of claims 1 to 4.

7. The side wall portions have side wall engaging portions that engage adjacent side wall portions with each other, The outer wall portion and the connecting wall portion are disposed at least below the side wall engaging portion. A container according to any one of claims 1 to 4.

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