Container set

Abstract

To lower the height of a container set in a stacked state and to reduce the lowering of the strength of the bottom wall constituting part of a container arranged on the upper side.SOLUTION: The container set is constituted by a first container and a second container that can be disposed so as to be stacked above a plurality of the first containers arranged horizontally, the partitioning portion (14) is formed so as to be received in the first container recessed portion in a state in which the second container is disposed above the plurality of the first containers, and the restriction protruding portion (256) is formed so that a size of the restriction protruding portion (256) is larger than an opening area of the partitioning portion (14). Alternatively, the opening shape of the partition portion (14) and the shape of the restricting protrusion (256) are made different from each other, so that the restricting protrusion is configured not to be received by the partition portion (14).SELECTED DRAWING: Figure 9

Description

[Technical Field]

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

[0002] For example, as described in Patent Document 1, a stackable container set is known in which containers of different sizes are arranged vertically. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-331198 Summary of the Invention [Problem to be solved by the invention]

[0004] One aspect of the present invention aims to reduce the height of a container set in a stacked state and to reduce the reduction in strength of the bottom wall component of the container placed on top, by using a configuration different from that of Patent Document 1. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, a container set according to one aspect of the present invention is a container set comprising a first container and a second container that can be stacked above a plurality of the first containers that are horizontally aligned, wherein the first container comprises a first container bottom wall component that is generally rectangular in plan view, and a first container side wall component that extends upward from each side edge of the first container bottom wall component, the first container side wall component having a plurality of first container regulating protrusions that protrude upward from an upper surface of the first container side wall component, and a first container recess formed between the plurality of first container regulating protrusions in a direction along the side edge of the first container side wall component on which the first container regulating protrusions are formed, and the second container comprises a second container bottom wall component that is generally rectangular in plan view, and a first container side wall component that extends upward from each side edge of the second container bottom wall component. and a wall portion, wherein the second container bottom wall component has a second container partitioning portion that partitions a plurality of spaces that open downward by a plurality of second container underside ribs that protrude downward from the underside of the second container bottom wall component, and a plurality of second container receiving portions that receive the first container regulating protrusion when the second container is placed above the plurality of first containers, and the second container partitioning portion is formed to be received in the first container recess when the second container is placed above the plurality of first containers, and the first container regulating protrusion is configured not to be received in the second container partitioning portion by making the size of the first container regulating protrusion larger than the opening area of ​​the second container partitioning portion or by making the opening shape of the second container partitioning portion different from the shape of the first container regulating protrusion. [Effects of the Invention]

[0006] According to one aspect of the present invention, the height of the container set in a stacked state can be reduced, and a decrease in strength of the bottom wall component of the container arranged on the upper side can be reduced. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 10 is a perspective view showing a state in which a plurality of containers are stacked. [Figure 2]FIG. 1 is a perspective view showing a plurality of small containers arranged horizontally. [Figure 3] FIG. 1 is a perspective view of a large container viewed from above. [Figure 4] FIG. 1 is a perspective view of a large container viewed from below. [Figure 5] FIG. 10 is an enlarged perspective view of a corner of a large container. [Figure 6] FIG. 1 is a perspective view of a small container viewed from above. [Figure 7] FIG. 1 is a perspective view of a small container viewed from below. [Figure 8] FIG. 10 is an enlarged perspective view of a corner of a small container. [Figure 9] 10 is a diagram showing the positional relationship between the bottom wall component of an upper container and the upper edge of a lower container when multiple containers of different sizes are stacked in layers. FIG. [Figure 10] FIG. 1 is a perspective view of a large container viewed from below. [Figure 11] FIG. 10 is an enlarged perspective view of a corner of a small container. [Figure 12] 10 is a diagram showing the positional relationship between the bottom wall component of an upper container and the upper edge of a lower container when multiple containers of different sizes are stacked in layers. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Embodiment 1] An embodiment of the present invention will be described in detail below. In the following description, the vertical direction refers to the vertical direction of the container 1 when the bottoms of the containers 1 and 2 are positioned downward. The vertical direction also refers to the height direction of the containers 1 and 2.

[0009] [Overview of container set 100] As shown in FIG. 1, container set 100 includes container 1 and container 2. Container 1 is an example of a second container, and container 2 is an example of a first container. Container 2 is a container smaller in size than container 1. Container 1 is a container that can be stacked above multiple containers 2 that are arranged horizontally. As shown in FIG. 2, for example, containers 2 may be arranged in the short direction of container 2. Container 1 may be slidably stacked above multiple containers 2 that are arranged horizontally. Here, slidable stacking refers to the process of stacking multiple containers vertically by abutting the bottom of the upper container against the upper edge of the lower container and sliding the upper container along the upper edge of the lower container to form a stacked state. Container 2 may be slidably stacked above container 1.

[0010] [Overview of Container 1] An overview of the container 1 will be described with reference to Figures 3 and 4. The container 1 includes a bottom wall constituent portion 10. The bottom wall constituent portion 10 has a generally rectangular shape in a plan view. The bottom wall constituent portion 10 is an example of a second container bottom wall constituent portion. In this embodiment, the bottom wall constituent portion 10 has a generally rectangular shape in a plan view. The bottom wall constituent portion 10 may also have a generally square shape in a plan view. The bottom wall constituent portion 10 may be composed of a bottom wall portion 11, a long side base portion 12, and a short side base portion 13. The bottom wall portion 11 forms the bottom surface of the storage space that stores the contents of the container 1.

[0011] The bottom wall 11 is provided with a pair of opposing long side base portions 12. The long side base portions 12 are provided along the long side edges of the bottom wall 11. Each of the pair of long side base portions 12 is provided with a long side side wall portion 20. The bottom wall 11 is provided with a pair of opposing short side base portions 13. The short side base portions 13 are provided along the short side edges of the bottom wall 11. Each of the pair of short side base portions 13 is provided with a short side side wall portion 30.

[0012] As shown in FIG. 4, the bottom wall component 10 includes a partition 14. The partition 14 is an example of a second container partition. The partition 14 is formed by a plurality of lower surface ribs that protrude downward from the lower surface of the bottom wall 11. The partition 14 defines a plurality of spaces that open downward by the lower surface ribs. The partition 14 may be formed on the long side base 12 or the short side base 13.

[0013] The bottom wall constituent portion 10 may have corner protrusions 16 that protrude downward from the lower surface of the bottom wall constituent portion 10. The corner protrusions 16 are an example of second container corner protrusions. The corner protrusions 16 are located at the bottom corners of the bottom wall constituent portion 10 and are formed at the four corners of the bottom wall constituent portion 10. The corner protrusions 16 are formed on the lower surfaces 12A of the long side base portions 12 and the lower surfaces 130 of the short side base portions 13. The corner protrusions 16 are generally L-shaped when viewed from the top-bottom direction. The corner protrusions 16 are formed along the outer peripheral edge 15 of the bottom wall constituent portion 10, extending from the long side base portion 12 to the short side base portion 13. It is sufficient that the corner protrusions 16 are formed at at least one of the four bottom wall corners of the bottom wall constituent portion 10. The corner protrusions 16 may be formed on either the underside 12A of the long-side base portion 12 or the underside 130 of the short-side base portion 13. The corner protrusions 16 may be substantially rectangular when viewed from the top-bottom direction. The surface of the corner protrusions 16 that follows the outer peripheral edge 15 of the bottom wall constituent portion 10 and faces the inside of the container 1 is connected to the underside rib (compartment portion 14). The portion of the corner protrusions 16 that connects from the portion that follows the outer peripheral edge 15 of the bottom wall constituent portion 10 to the underside rib is substantially perpendicular to the direction along each side edge. The undersides of the underside rib (compartment portion 14), corner protrusions 16, etc. form a support portion that is supported on an installation surface such as a floor.

[0014] The bottom wall constituent part 10 may include a receiving part 17. The receiving part 17 is an opening formed in the long side base part 12 and opening downward. The receiving part 17 is an opening whose longitudinal direction is along the side edge of the long side side wall part 20. The direction along the side edge of the long side side wall part 20 is the longitudinal direction of the container 1 and also the direction along the side edge of the long side of the bottom wall constituent part 10. The direction along the side edge of the short side side wall part 30 is the lateral direction of the container 1 and also the direction along the side edge of the short side of the bottom wall constituent part 10.

[0015] The bottom wall constituent portion 10 may include a bottom wall protrusion 18. The bottom wall protrusion 18 protrudes downward from the lower surface of the bottom wall constituent portion 10. More specifically, the bottom wall protrusion 18 protrudes downward from the lower surface 12A of the long side base portion 12. The bottom wall protrusion 18 may be formed adjacent to the outer peripheral edge 15 of the bottom wall constituent portion 10 or adjacent to the receiving portion 17. The bottom wall protrusion 18 may also be formed on the short side base portion 13. The width of the bottom wall protrusion 18 in the direction along the side edges of the long side sidewall portions 20 is smaller than the width of the corner protrusions 16 in the direction along the side edges of the long side sidewall portions 20. The width of the bottom wall protrusion 18 in the direction along the side edges of the long side sidewall portions 20 may be greater than or equal to the width of the corner protrusions 16 in the direction along the side edges of the long side sidewall portions 20.

[0016] The bottom wall component 10 has a plurality of regulating protrusion receiving portions 19. The regulating protrusion receiving portions 19 are an example of second container receiving portions. The regulating protrusion receiving portions 19 receive regulating protrusions 256 of the containers 2, which will be described later, when the container 1 is stacked above the plurality of containers 2. The regulating protrusion receiving portions 19 are formed on the underside of the bottom wall portion 11. The regulating protrusion receiving portions 19 are portions where no underside ribs are formed, and are formed to correspond to the positions of the regulating protrusions 256 of the containers 2 when they are stacked. A partition portion 14 is formed between the two regulating protrusion receiving portions 19 in the direction along the side edges of the short-side side wall portion 30.

[0017] The restricting protrusion receiving portion 19 is a portion surrounded by a frame portion 190, which is a rib that forms a rectangular frame when viewed from above. The frame portion 190 is composed of a pair of long side ribs extending in a direction along the side edges of the long side wall portion 20 and a pair of short side ribs extending in a direction along the side edges of the short side wall portion 30, and defines a rectangular space when viewed from above. Each short side rib that forms the frame portion 190 is connected to both ends of each long side rib of the frame portion 190 in the direction along the side edges of the long side side wall portion 20. The restricting protrusion receiving portion 19 is surrounded on its entire periphery by a partition portion 14. That is, the partition portion 14 is formed on the entire outer periphery of the space surrounded by the frame portion 190. The pair of long side ribs and the pair of short side ribs that form the frame portion 190 may each be connected to the partition portion 14. The restricting protrusion receiving portion 19 may be configured so that a portion of the entire circumference is surrounded by the partition portion 14. For example, in the inward / outward direction of the container 1, the partition portion 14 may not be formed on the outer side of the container 1 than the long side rib of the pair of long side ribs of the frame portion 190 that is located on the outer side of the container 1. The frame portion 190 (long side ribs, short side ribs) may be part of the underside ribs.

[0018] As shown in FIG. 3 , the container 1 includes a pair of opposing long-side sidewalls 20 and a pair of opposing short-side sidewalls 30 extending upward from corresponding side edges of the bottom wall component 10. The long-side sidewalls 20 and the short-side sidewalls 30 are examples of second container sidewalls. The pair of long-side sidewalls 20 are rotatably connected to the long-side base 12 by first hinges 21 provided at the lower ends of the long-side sidewalls 20. The pair of short-side sidewalls 30 are rotatably connected to the short-side base 13 by second hinges 31 provided at the lower ends of the short-side sidewalls 30.

[0019] In this embodiment, the container 1 is a foldable container that can be changed from an assembled state to a folded state. As shown in Fig. 3, the container 1 is in an assembled state in which it is assembled into a box shape by rotating the pair of long-side side walls 20 and the pair of short-side side walls 30 relative to the long-side base 12 and the short-side base 13, respectively, to an upright position. The container 1 is also in a folded state (not shown) by rotating the pair of long-side side walls 20 and the pair of short-side side walls 30, which are in an upright position, toward the inside of the container 1 relative to the long-side base 12 and the short-side base 13, respectively. Note that the container 1 may be a container that cannot be changed to a folded state. In other words, the pair of long side wall portions 20 and the pair of short side wall portions 30 do not have to be rotatable relative to the long side base portion 12 and the short side base portion 13, respectively, and the container 1 may also be one in which the pair of long side side wall portions 20, the pair of short side side wall portions 30, and the bottom wall component portion 10 are integrally formed.

[0020] [Configuration of the upper edge of the container 1] The detailed configuration of the upper edge of the container 1 will be described with reference to Figure 5. A main receiving portion 50 may be formed at the container corner of the container 1 to receive a protrusion of an upper container (corner protrusion 16 of the container 1 or corner protrusion 216 (described later) of the upper container 2). The container corner of the container 1 is the portion where the long side wall portion 20 and the short side side wall portion 30 are connected. The main receiving portion 50 constitutes part of the upper edge of the container 1 and is formed on the upper surface 22 of the long side wall portion 20 and the upper surface 32 of the short side side wall portion 30. The main receiving portion 50 is formed at a container corner of the container 1, extending from one end of the long-side side wall portion 20 in the direction along the side of the long-side side wall portion 20 to one end of the long-side side wall portion 20, and from one end of the short-side side wall portion 30 in the direction along the side of the short-side side wall portion 30 to one end of the short-side side wall portion 30 in the direction along the side of the short-side side wall portion 30. It is sufficient that the main receiving portion 50 is formed at any one of the four container corners of the container 1.

[0021] The main receiving portion 50 may have a receiving portion restricting wall 51. The receiving portion restricting wall 51 is a wall that protrudes upward from the entire outer edge of the bottom surface of the main receiving portion 50 in the inward / outward direction of the container 1. The bottom surface of the main receiving portion 50 faces upward and is the surface against which the lower end of the protrusion of an upper container received in the main receiving portion 50 abuts. The receiving portion restricting wall 51 is composed of a wall 51A that extends in a direction along the side edges of the long-side sidewall portions 20 and a wall 51B that extends in a direction along the side edges of the short-side sidewall portions 30. The receiving portion restricting wall 51 abuts against the protrusion of the upper container received in the main receiving portion 50, thereby restricting horizontal movement of the upper container (container 1 or container 2). More specifically, wall 51A abuts against the protrusion of the upper container, thereby restricting movement along the side of short-side sidewall portion 30 of the upper container. Wall 51B abuts against the protrusion of the upper container, thereby restricting movement along the side of long-side sidewall portion 20 of the upper container. It can also be said that main receiving portion 50 is recessed downward from each of top surface 22 and top surface 32. Furthermore, main receiving portion 50 is generally L-shaped when viewed from the top-bottom direction.

[0022] The receiving portion restricting wall 51 does not need to be formed on the entire outer edge of the bottom surface of the main receiving portion 50, but may be formed on a part of the outer edge of the bottom surface of the main receiving portion 50. The receiving portion restricting wall 51 may have only a wall 51A extending in a direction along the side of the long side sidewall portion 20, or may have only a wall 51B extending in a direction along the short side sidewall portion 30. The receiving portion restricting wall 51 is formed on the long side sidewall portion 20 and the short side sidewall portion 30 (the wall 51A and the wall 51B are formed on the long side sidewall portion 20, and the wall 51B is formed on the short side sidewall portion 30), but may be formed on either the long side sidewall portion 20 or the short side sidewall portion 30.

[0023] The long-side sidewall portion 20 and the short-side sidewall portion 30 may have an inclined portion 53 formed adjacent to the main receiving portion 50 and having an inclined surface. The inclined surface of the inclined portion 53 slopes toward the bottom surface of the main receiving portion 50 as it approaches the main receiving portion 50. The inclined portion 53 formed on the long-side sidewall portion 20 continues from the uppermost portion 23 located at the top of the top surface 22 of the long-side sidewall portion 20, and is located lower than the uppermost portion 23 in the vertical direction. The inclined portion 53 formed on the short-side sidewall portion 30 continues from the uppermost portion 33 located at the top of the top surface 32 of the short-side sidewall portion 30, and is located lower than the uppermost portion 33 in the vertical direction.

[0024] The long-side sidewall portion 20 and the short-side sidewall portion 30 may have horizontal portions 54 having horizontal surfaces. The horizontal portions 54 are continuous with the inclined portions 53 and connected to the main receiving portion 50. One end of the horizontal portions 54 in the direction along the side of the sidewall portion (long-side sidewall portion 20 or short-side sidewall portion 30) is connected to the inclined portions 53, and the other end of the horizontal portions 54 in the direction along the side of the sidewall portion (long-side sidewall portion 20 or short-side sidewall portion 30) is connected to the main receiving portion 50.

[0025] The inclined portion 53 and horizontal portion 54 formed on the long-side sidewall portion 20 are part of the upper surface 22 of the long-side sidewall portion 20. The inclined portion 53 and horizontal portion 54 formed on the short-side sidewall portion 30 are part of the upper surface 32 of the short-side sidewall portion 30. In other words, the inclined portion 53 and horizontal portion 54 constitute part of the upper edge portion of the container 1. The inclined portion 53 and horizontal portion 54 are located above the bottom surface of the main receiving portion 50 in the vertical direction. The inclined portion 53 and horizontal portion 54 may form a continuous, smooth surface without any steps. The inclined portion 53 and horizontal portion 54 may be formed on either the long-side sidewall portion 20 or the short-side sidewall portion 30. Either the inclined portion 53 or the horizontal portion 54 does not have to be formed on the long-side sidewall portion 20. If the horizontal portion 54 is not formed, the inclined portion 53 may be connected to the main receiving portion 50.

[0026] The long-side sidewall portions 20 and the short-side sidewall portions 30 may have opposing portions 55 formed adjacent to the main receiving portion 50. The opposing portions 55 formed on the long-side sidewall portions 20 have surfaces facing in a direction along the side edges of the long-side sidewall portions 20. That is, the opposing portions 55 formed on the long-side sidewall portions 20 have surfaces extending in a direction intersecting (e.g., substantially perpendicular to) the side edges of the long-side sidewall portions 20. More specifically, the opposing portions 55 formed on the long-side sidewall portions 20 have surfaces facing the adjacent corner protrusions 16 in the direction along the side edges of the long-side sidewall portions 20. The opposing portions 55 formed on the short-side sidewall portions 30 have surfaces facing in a direction along the side edges of the short-side sidewall portions 30. That is, the opposing portion 55 formed on the short-side side wall portion 30 has a surface that extends in a direction intersecting (e.g., a direction substantially perpendicular to) the side of the short-side side wall portion 30. More specifically, the opposing portion 55 formed on the short-side side wall portion 30 has a surface that faces the adjacent main receiving portion 50 in the direction along the side of the short-side side wall portion 30.

[0027] The facing portion 55 is located lower than the upper end of the rail portion 52 in the up-down direction. In this embodiment, the facing portion 55 is formed between the horizontal portion 54 and the main receiving portion 50 in the direction along the side of the side wall portion (long side side wall portion 20 or short side side wall portion 30). The facing portion 55 is located lower than the inclined portion 53 and the horizontal portion 54 in the up-down direction. The facing portion 55 formed on the long side side wall portion 20 is formed to protrude upward from the end of the bottom surface of the main receiving portion 50 in the direction along the side of the long side side wall portion 20. The facing portion 55 formed on the short side side wall portion 30 is formed to protrude upward from the end of the bottom surface of the main receiving portion 50 in the direction along the side of the short side side wall portion 30.

[0028] Rail portions 52 may be formed on the long-side sidewall portions 20 and the short-side sidewall portions 30 adjacent to the main receiving portion 50. The rail portions 52 protrude upward from at least a partial outer edge of the sliding surface of the sidewall portions for guiding the protrusion formed on the bottom of the upper container into the main receiving portion 50 of the lower container 1. The sliding surfaces of the long-side sidewall portions 20 are the uppermost portion 23, the inclined portion 53, and the horizontal portion 54 of the upper surface 22 of the long-side sidewall portion 20, and the sliding surfaces of the short-side sidewall portions 30 are the uppermost portion 33, the inclined portion 53, and the horizontal portion 54 of the upper surface 32 of the short-side sidewall portion 30. The rail portions 52 protrude upward from the outer edges of the inclined surface of the inclined portion 53 and the horizontal surface of the horizontal portion 54. The rail portions 52 may protrude upward from at least a partial outer edge of the uppermost portion 23 or the uppermost portion 33.

[0029] The rail portions 52 formed on the long-side sidewall portions 20 extend in a direction along the side edges of the long-side sidewall portions 20. The rail portions 52 formed on the long-side sidewall portions 20 are connected to the wall 51A of the main receiving portion 50. The rail portions 52 formed on the short-side sidewall portions 30 extend in a direction along the side edges of the short-side sidewall portions 30. The rail portions 52 formed on the short-side sidewall portions 30 are connected to the wall 51B of the main receiving portion 50. Note that the rail portions 52 may not be connected to either the wall 51A or the wall 51B, i.e., may be discontinuous with either the wall 51A or the wall 51B.

[0030] In the vertical direction, the upper end of the rail portion 52 formed on the long-side sidewall portion 20 may be located at the same position as the uppermost portion 23, and the upper end of the rail portion 52 formed on the short-side sidewall portion 30 may be located at the same height as the uppermost portion 33. That is, in the vertical direction, there may be no step between the upper end of the rail portion 52 and the uppermost portion 23, or between the upper end of the rail portion 52 and the uppermost portion 33. The rail portion 52 may be formed on either the long-side sidewall portion 20 or the short-side sidewall portion 30. Furthermore, the inclined portion 53 may be omitted, and the upper surface of the horizontal portion 54 may be the uppermost portion 23 or the uppermost portion 33. In this case, the upper end of the rail portion 52 is higher than the upper surface of the horizontal portion 54. Furthermore, the rail portion 52 may be formed over the entire length of the long-side sidewall portion 20 or the short-side sidewall portion 30. In addition, a portion of the receiving portion regulating wall 51 functions as a guide surface that guides the corner protrusion 16 of the upper container 1U into the main receiving portion 50 during the sliding stacking process until the lower end of the corner protrusion 16 of the upper container 1U abuts the bottom surface of the main receiving portion 50.

[0031] As shown in FIG. 5, a sub-receptor 60 may be formed in the long side wall portion 20. In this embodiment, two sub-receptors 60 are formed in the central portion of the long side wall portion 20 in the direction along the side of the long side wall portion 20. Note that it is sufficient for one or more sub-receptors 60 to be formed in the long side wall portion 20. Furthermore, the long side wall portion 20 does not have to have a sub-receptor 60. The sub-receptor 60 forms part of the upper edge portion of the container 1. The sub-receptor 60 may have a receptor limiting wall 61. The receptor limiting wall 61 is a wall that protrudes upward from the entire outer edge of the bottom surface of the sub-receptor 60 in the inward / outward direction of the container 1. The bottom surface of the sub-receptor 60 is a surface facing upward and forms part of the upper surface 22 of the long side wall portion 20. The receiver restriction wall 61 does not need to be formed on the entire outer edge of the bottom surface of the sub-receiver 60, but may be formed on a part of the outer edge of the bottom surface of the sub-receiver 60. The sub-receiver 60 can also be said to be recessed downward from the top surface 22. The sub-receiver 60 is also roughly I-shaped when viewed from the top-bottom direction.

[0032] The long side wall portion 20 may have an inclined portion 63 having an inclined surface. The inclined portion 63 is adjacent to the sub-receiving portion 60. The inclined surface of the inclined portion 63 has an inclined surface that slopes downward as it approaches the sub-receiving portion 60. In other words, the inclined surface of the inclined portion 63 slopes toward the bottom side of the sub-receiving portion 60 as it approaches the sub-receiving portion 60. The inclined portion 63 is continuous with the uppermost portion 23 and is located lower than the uppermost portion 23 in the up-down direction.

[0033] A horizontal portion 64 having a horizontal surface may be formed on the long-side side wall portion 20. The horizontal portion 64 continues from the inclined portion 63 and connects to the auxiliary receiving portion 60. One end of the horizontal portion 64 in the direction along the side of the long-side side wall portion 20 connects to the inclined portion 63, and the other end of the horizontal portion 64 in the direction along the side of the long-side side wall portion 20 connects to the auxiliary receiving portion 60.

[0034] The inclined portion 63 and the horizontal portion 64 are part of the upper surface 22 of the long side side wall portion 20. In other words, the inclined portion 63 and the horizontal portion 64 constitute part of the upper edge portion of the container 1. The inclined portion 63 and the horizontal portion 64 are located above the bottom surface of the auxiliary receiving portion 60 in the vertical direction. Either the inclined portion 63 or the horizontal portion 64 does not have to be formed on the long side side wall portion 20. If the horizontal portion 64 is not formed, the inclined portion 63 may be connected to the auxiliary receiving portion 60.

[0035] The long-side side wall portion 20 may have an opposing portion 65 formed thereon. The opposing portion 65 is formed adjacent to the sub-receiving portion 60. The opposing portion 65 has a surface facing in a direction along the side of the long-side side wall portion 20. That is, the opposing portion 65 has a surface extending in a direction intersecting (e.g., substantially perpendicular to) the side of the long-side side wall portion 20. More specifically, the opposing portion 65 has a surface facing the adjacent sub-receiving portion 60 in the direction along the side of the long-side side wall portion 20. The opposing portion 65 is located lower than the upper end of the rail portion 62 in the vertical direction. In this embodiment, the opposing portion 65 is formed between the horizontal portion 64 and the sub-receiving portion 60 in the direction along the side of the long-side side wall portion 20. The opposing portion 65 is located lower than the inclined portion 63 and the horizontal portion 64 in the vertical direction. The facing portion 65 is formed so as to protrude upward from the end of the bottom surface of the sub-receiving portion 60 in the direction along the side of the long-side sidewall portion 20.

[0036] A rail portion 62 may be formed on the long-side sidewall portion 20. The rail portion 62 is formed adjacent to the sub-receiving portion 60. The rail portion 62 protrudes upward from at least a portion of the outer edge of the sliding surface of the sidewall portion for guiding a corner protrusion of an upper container, which is different in size from the container 1, into the sub-receiving portion 60 of the lower container 1. The sliding surfaces of the long-side sidewall portion 20 along which the corner protrusion of the upper container, which is different in size from the container 1, slide are the uppermost portion 23, the inclined portion 63, and the horizontal portion 64 of the upper surface 22. The rail portion 62 protrudes upward from the outer edges of the inclined surface of the inclined portion 63 and the horizontal surface of the horizontal portion 64. The rail portion 62 may protrude upward from at least a portion of the outer edge of the uppermost portion 23. In the vertical direction, the inclined portion 63 may be omitted, and the upper surface of the horizontal portion 64 may be the uppermost portion 23. In this case, the upper end of the rail portion 62 is higher than the upper surface of the horizontal portion 64.

[0037] The rail portion 62 extends in a direction along the side of the long-side sidewall portion 20. The rail portion 62 is connected to the receiving portion restricting wall 61 of the sub-receiving portion 60. The rail portion 62 may not be connected to the receiving portion restricting wall 61, i.e., may be discontinuous with the receiving portion restricting wall 61. The upper end of the rail portion 62 may be located at the same position as the uppermost portion 23 in the vertical direction. In other words, there may be no step between the upper end of the rail portion 62 and the uppermost portion 23 in the vertical direction. The rail portion 62 does not have to be formed on the long-side sidewall portion 20. The rail portion 62 may be connected to the rail portion 52 formed on the long-side sidewall portion 20.

[0038] A partition 66 may be formed on the long-side side wall 20. The partition 66 is a wall that separates two sub-receiving sections 60 in a direction along the side of the long-side side wall 20. The partition 66 may include an opposing section 67 having a surface facing in a direction along the side of the long-side side wall 20. The upper end of the partition 66 is lower than the uppermost section 23 in the up-down direction. A rail section 69 may be formed on the upper surface of the partition 66, extending in a direction along the side of the long-side side wall 20. The sub-receiving section 60 may have a side wall protrusion 68 that protrudes upward from the bottom surface of the sub-receiving section 60.

[0039] The long side wall portion 20 may have a protrusion receiving portion 70 formed therein. The protrusion receiving portion 70 is capable of receiving the bottom wall protrusion 18 of the upper container 1. The protrusion receiving portion 70 is a recess formed in the uppermost portion 23 of the long side wall portion 20. The protrusion receiving portion 70 constitutes part of the upper edge of the container 1. In the direction along the side of the long side wall portion 20, the protrusion receiving portion 70 is located between the inclined portion 53 and the inclined portion 63.

[0040] [Overview of Container 2] The configuration of the container 2 will be described with reference to FIGS. 6 to 9. As shown in FIG. 6, the container 2 includes a bottom wall constituent portion 210. The bottom wall constituent portion 210 has a generally rectangular shape in a plan view. The bottom wall constituent portion 210 is an example of a first container bottom wall constituent portion. In this embodiment, the bottom wall constituent portion 210 has a generally rectangular shape in a plan view. The bottom wall constituent portion 210 may have a generally square shape in a plan view. The bottom wall constituent portion 210 may be composed of a bottom wall portion 211, a long side base portion 212, and a short side base portion 213. The bottom wall portion 211 forms the bottom surface of the storage space that stores the contents of the container 2.

[0041] The bottom wall portion 211 is provided with a pair of opposing long side base portions 212. The long side base portions 212 are provided along the side edges on the long sides of the bottom wall portion 211. Each of the pair of long side base portions 212 is provided with a long side side wall portion 220. The bottom wall portion 211 is provided with a pair of opposing short side base portions 213. The short side base portions 213 are provided along the side edges on the short sides of the bottom wall portion 211. Each of the pair of short side base portions 213 is provided with a short side side wall portion 230.

[0042] As shown in Fig. 7, the bottom wall component 210 includes a partition 214. The partition 214 is formed by a plurality of lower surface ribs that protrude downward from the lower surface of the bottom wall 211. The partition 214 defines a plurality of spaces that open downward by the lower surface ribs. The partition 214 may be formed on the long side base 212 or the short side base 213.

[0043] The bottom wall constituent portion 210 may include corner protrusions 216 that protrude downward from the lower surface of the bottom wall constituent portion 210. The corner protrusions 216 are located at the bottom wall corners of the bottom wall constituent portion 210 and are formed at the four corners of the bottom wall constituent portion 210. The corner protrusions 216 are formed on the lower surfaces of the long side base portion 212 and the short side base portion 213. The corner protrusions 216 are generally L-shaped when viewed from the top-bottom direction. The corner protrusions 216 are formed along the outer peripheral edge 215 of the bottom wall constituent portion 210, spanning from the long side base portion 212 to the short side base portion 213. It is sufficient that the corner protrusions 216 are formed at at least one of the four bottom wall corners of the bottom wall constituent portion 210. The corner protrusions 216 may be formed on either the underside of the long-side base portion 212 or the underside of the short-side base portion 213. The corner protrusions 216 may be substantially rectangular when viewed from the top-bottom direction. The surface of the corner protrusions 216 that follows the outer peripheral edge 215 of the bottom wall constituent portion 210 and faces the inside of the container 2 is connected to the underside rib (compartment portion 214). The portion of the corner protrusions 216 that connects from the portion that follows the outer peripheral edge 215 of the bottom wall constituent portion 210 to the underside rib is substantially perpendicular to the direction along each side edge. The undersides of the underside rib (compartment portion 214), corner protrusions 216, etc. form a support portion that is supported on an installation surface such as a floor.

[0044] The bottom wall constituent portion 210 may include a bottom wall protrusion 218. The bottom wall protrusion 218 protrudes downward from the lower surface of the bottom wall constituent portion 210. More specifically, the bottom wall protrusion 218 protrudes downward from the lower surface of the short side base portion 213. The bottom wall protrusion 218 may be formed adjacent to the outer peripheral edge 215 of the bottom wall constituent portion 210. The bottom wall protrusion 218 is received in the protrusion receiving portion 70 when the container 2 is placed above the container 1.

[0045] As shown in Fig. 6, the container 2 includes a pair of opposing long-side sidewalls 220 and a pair of opposing short-side sidewalls 230 that extend upward from corresponding side edges of the bottom wall component 210. The long-side sidewalls 220 and the short-side sidewalls 230 are examples of first container sidewalls. The pair of long-side sidewalls 220 are rotatably connected to the long-side base 212 by first hinges 221 provided at the lower ends of the long-side sidewalls 220. The pair of short-side sidewalls 230 are rotatably connected to the short-side base 213 by second hinges 231 provided at the lower ends of the short-side sidewalls 230.

[0046] In this embodiment, the container 2 is a foldable container that can be changed from an assembled state to a folded state. As shown in Fig. 5, the container 2 is in an assembled state in which it is assembled into a box shape by rotating the pair of long-side sidewalls 220 and the pair of short-side sidewalls 230 relative to the long-side bases 212 and the short-side bases 213, respectively, to an upright position. The container 2 is also in a folded state (not shown) by rotating the pair of long-side sidewalls 220 and the pair of short-side sidewalls 230, which are in an upright position, toward the inside of the container 2 relative to the long-side bases 212 and the short-side bases 213, respectively, to fold them. Note that the container 2 may be a container that cannot be changed to a folded state. In other words, the pair of long side wall portions 220 and the pair of short side wall portions 230 do not have to be rotatable relative to the long side base portion 212 and the short side base portion 213, respectively, and the container 2 may also be one in which the pair of long side side wall portions 220, the pair of short side side wall portions 230, and the bottom wall component portion 210 are integrally formed.

[0047] [Configuration of the upper edge of the container 2] The detailed configuration of the upper edge of the container 2 will be described with reference to Figure 8. A main receiving portion 250 that receives the corner protrusion 16 of the container 1 located above may be formed at the container corner of the container 2. The main receiving portion 250 is an example of a first container protrusion receiving portion. The container corner of the container 2 is the portion where the long side wall portion 220 and the short side side wall portion 230 are connected. The main receiving portion 250 forms part of the upper edge of the container 2. The main receiving portion 250 is formed on the upper surface 222 of the long side side wall portion 220 and the upper surface 232 of the short side side wall portion 230. The main receiving portion 250 is formed at the container corner of the container 2, from one end of the long-side side wall portion 220 in the direction along the side of the long-side side wall portion 220 to one end of the long-side side wall portion 220, and from one end of the short-side side wall portion 230 in the direction along the side of the short-side side wall portion 230 to one end of the short-side side wall portion 230 in the direction along the side of the short-side side wall portion 230. Note that the main receiving portion 250 does not need to be formed at the four corners of the container 2, and it may be formed at any one of the four container corners of the container 2.

[0048] The main receiving portion 250 may have a receiving portion restricting wall 251. The receiving portion restricting wall 251 is a wall that protrudes upward from at least a part of the outer edge of the bottom surface of the main receiving portion 250 in the inward / outward direction of the container 2. The bottom surface of the main receiving portion 250 faces upward and is the surface against which the lower end of the corner protrusion 16 of the upper container 1 received in the main receiving portion 250 abuts. The receiving portion restricting wall 251 is composed of a wall 251A extending in a direction along the side edge of the long-side sidewall portion 220 and a wall 251B extending in a direction along the side edge of the short-side sidewall portion 230. The receiving portion restricting wall 251 abuts against the corner protrusion 16 of the upper container 1 received in the main receiving portion 250, thereby restricting horizontal movement of the upper container 1. More specifically, the wall 251A abuts against the surface of the corner projection 16 of the upper container 1 that faces in the direction along the side of the long-side sidewall 20, thereby restricting movement along the side of the long-side sidewall 20 of the upper container 1, i.e., movement along the side of the short-side sidewall 230 of the container 2. The wall 251B abuts against the surface of the corner projection 16 of the upper container 1 that faces in the direction along the side of the short-side sidewall 30 of the upper container 1, thereby restricting movement along the side of the short-side sidewall 30 of the upper container 1, i.e., movement along the side of the long-side sidewall 220 of the container 2. The receiving portion restricting wall 251 may have only the wall 251A extending in a direction along the side of the long-side sidewall portion 220, or may have only the wall 251B extending in a direction along the short-side sidewall portion 230. Furthermore, the receiving portion restricting wall 251 is formed on the short-side sidewall portion 230 (the wall 251A and the wall 251B are formed on the short-side sidewall portion 230, and not on the long-side sidewall portion 220), but may also be formed on the long-side sidewall portion 220, or may be formed on both the long-side sidewall portion 220 and the short-side sidewall portion 230.

[0049] The short-side sidewall 230 may have an inclined portion 253 having an inclined surface formed adjacent to the main receiving portion 250. The inclined surface of the inclined portion 253 slopes downward as it approaches the main receiving portion 250. That is, the inclined surface of the inclined portion 253 slopes toward the bottom surface of the main receiving portion 250 as it approaches the main receiving portion 250. The inclined portion 253 is continuous with the uppermost portion 233 located at the top of the top surface 232 of the short-side sidewall 230, and is located below the uppermost portion 233 in the up-down direction. Forming the inclined portion 253 makes it easier to introduce the corner protrusion 16 of the upper container 1 into the main receiving portion 250.

[0050] A horizontal portion 254 having a horizontal surface may be formed on the short-side side wall portion 230. The horizontal portion 254 is continuous with the inclined portion 253 and connected to the main receiving portion 250. One end of the horizontal portion 254 in the direction along the side edge of the short-side side wall portion 30 connects to the inclined portion 253, and the other end of the horizontal portion 254 in the direction along the side edge of the short-side side wall portion 30 connects to the main receiving portion 250. By forming the horizontal portion 254, it is possible to reduce the momentum of the corner protrusion 16 of the upper container 1 being introduced into the main receiving portion 250 via the inclined portion 253.

[0051] The inclined portion 253 and horizontal portion 254 formed on the short-side sidewall portion 230 are part of the upper surface 232 of the short-side sidewall portion 230. In other words, the inclined portion 253 and horizontal portion 254 constitute part of the upper edge portion of the container 2. The inclined portion 253 and horizontal portion 254 are located above the bottom surface of the main receiving portion 250 in the vertical direction. The inclined portion 253 and horizontal portion 254 may form a continuous, smooth surface without any steps. The inclined portion 253 and horizontal portion 254 may not be formed on the short-side sidewall portion 230. Also, either the inclined portion 253 or the horizontal portion 254 may not be formed on the short-side sidewall portion 230. If the horizontal portion 254 is not formed, the inclined portion 253 may be connected to the main receiving portion 250.

[0052] The short-side side wall portion 230 may have an opposing portion 255 formed adjacent to the main receiving portion 250. The opposing portion 255 has a surface facing in a direction along the side of the short-side side wall portion 230, i.e., a surface extending in a direction intersecting (e.g., substantially perpendicular to) the side of the short-side side wall portion 230. More specifically, the opposing portion 255 has a surface facing the adjacent main receiving portion 250 in the direction along the side of the short-side side wall portion 230. The opposing portion 255 is located lower than the upper end of the rail portion 252 in the up-down direction. In this embodiment, the opposing portion 255 is formed between the horizontal portion 254 and the main receiving portion 250 in the direction along the side of the short-side side wall portion 230. The opposing portion 255 is located lower than the inclined portion 253 and the horizontal portion 254 in the up-down direction. The facing portion 255 is formed so as to protrude upward from the end of the bottom surface of the main receiving portion 250 in the direction along the side of the short-side sidewall portion 230.

[0053] A rail portion 252 is formed on the short-side side wall portion 230 adjacent to the main receiving portion 250. The rail portion 252 protrudes upward from at least a part of the outer edge of the sliding surface of the short-side side wall portion 230 for guiding the corner protrusion 16 of the upper container 1 into the main receiving portion 250 of the lower container 2. The sliding surface of the short-side side wall portion 230 is the uppermost portion 233, the inclined portion 253, and the horizontal portion 254 of the upper surface 232 of the short-side side wall portion 230.

[0054] The rail portion 252 protrudes upward from the outer edges of the inclined surface of the inclined portion 253 and the horizontal surface of the horizontal portion 254. The rail portion 252 may protrude upward from at least a portion of the outer edge of the uppermost portion 233. The rail portion 252 extends in a direction along the side of the short-side sidewall portion 230. The rail portion 252 is connected to the wall 251B of the main receiving portion 250. The rail portion 252 may not be connected to the wall 251B, i.e., may be discontinuous with the wall 251B. In the vertical direction, the upper end of the rail portion 252 may be located at the same height as the uppermost portion 233. In other words, there may be no step between the upper end of the rail portion 252 and the uppermost portion 233 in the vertical direction. Alternatively, the inclined portion 253 may be omitted, and the upper surface of the horizontal portion 254 may be the uppermost portion 233. In this case, the upper end of the rail portion 252 is higher than the upper surface of the horizontal portion 254. The rail portion 252 may be formed over the entire length of the short-side sidewall portion 230.

[0055] The long-side sidewall portion 220 is formed with a plurality of restricting protrusions 256 that protrude upward from the upper surface 222 of the long-side sidewall portion 220. The restricting protrusions 256 are an example of first container restricting protrusions. In this embodiment, two restricting protrusions 256 are formed adjacent to the main receiving portion 250 of the container 2. The upper end surface 256A of the restricting protrusions 256 is a sliding surface that can slide over the corner protrusions 16 of the upper container 1. The upper end surface 256A is a horizontal plane. Note that the upper end surface 256A may be an inclined surface that slopes toward the bottom surface of the main receiving portion 250 as it approaches the main receiving portion 250. The restricting protrusions 256 are configured to be larger than the opening area of ​​the partition portion 14 of the container 1 so that they cannot be received in the partition portion 14. The restricting protrusion 256 may be configured so as not to be received in the partition 14 by making the shape of the restricting protrusion 256 different from the opening shape of the partition 14 of the container 1. "Making the shape of the opening of the partition 14 of the container 1 different from the shape of the restricting protrusion 256" means that the shapes are different when viewed from the top and bottom, so that the restricting protrusion 256 is not received in the partition 14. Therefore, for example, the area of ​​the size of the restricting protrusion 256 may be smaller than the area of ​​the opening of the partition 14 of the container 1.

[0056] A rail portion 257 may be formed on the outer edge of the upper end surface 256A of the restricting protrusion 256. The rail portion 257 extends in a direction along the side of the long-side sidewall portion 220. The upper end of the rail portion 257 is the uppermost portion of the long-side sidewall portion 220 in the up-down direction, and is located at approximately the same position as the uppermost portion 233 of the short-side sidewall portion 230. In other words, the rail portion 257, together with the uppermost portion 233, constitutes the uppermost portion of the sidewall portion of the container 2. In this embodiment, the rail portion 257 is not connected to the wall 251A of the receiving portion restricting wall 251 that extends in a direction along the long-side sidewall portion 220. In other words, the rail portion 257 and the wall 251A are not continuous.

[0057] The restricting protrusion 256 may include a facing portion 258. The facing portion 258 is an example of a first container facing portion. The facing portion 258 is a surface facing in a direction along the side of the long-side sidewall portion 220 and faces the corner protrusion 16 of the container 1 received in the main receiving portion 250. That is, the facing portion 258 has a surface extending in a direction intersecting (e.g., substantially perpendicular to) the side of the long-side sidewall portion 220. More specifically, the facing portion 258 is a surface of the restricting protrusion 256 facing the adjacent main receiving portion 250 in the direction along the side of the long-side sidewall portion 220. The facing portion 258 is located lower than the upper end of the rail portion 257 in the up-down direction. The facing portion 258 is formed to protrude upward from the end of the bottom surface of the main receiving portion 250 in the direction along the side of the long-side sidewall portion 220.

[0058] A recess 280 is formed in the long-side sidewall portion 220. The recess 280 is an example of a first container recess. The recess 280 is formed between two restricting protrusions 256 in the direction along the side of the long-side sidewall portion 220. The recess 280 is configured to receive the partition 14 of the container 1 when the container 1 is placed above the container 2. More specifically, the recess 280 receives the partition 14 formed between two restricting protrusion receiving portions 19 in the direction along the side of the short-side sidewall portion 30 of the container 1. The height H2 of the recess 280 in the vertical direction is preferably equal to or greater than the height H1 (see FIG. 4) of the partition 14 of the container 1 in the vertical direction. The height H2 is the height from the top surface 222, from which the restricting protrusion 256 protrudes, to the upper end of the rail portion 257. Height H1 is the height in the vertical direction from the lower surface of bottom wall 11 of container 1 to the lower end of the lower surface rib that constitutes partition 14. Height H2 may be lower than height H1. Also, the lower end of partition 14 of container 1 received in recess 280 may abut against recess 280, thereby supporting container 1 above container 2.

[0059] A protrusion receiving portion 270 may be formed in the short-side side wall portion 230. The protrusion receiving portion 270 receives the bottom wall protrusion 18 of the upper container 1. The protrusion receiving portion 270 is a recess formed in the uppermost portion 233 of the short-side side wall portion 230. The protrusion receiving portion 270 constitutes part of the upper edge of the container 2. In the direction along the side of the short-side side wall portion 230, the protrusion receiving portion 270 is located between the two inclined portions 253.

[0060] The protrusion receiving portion 270 may be configured so that the bottom wall protrusion 18 of the upper container 1 is not received in the protrusion receiving portion 270 of the lower container 2 when the corner protrusion 16 of the upper container 1 is slid onto the upper edge (upper surface 232 of the short-side sidewall portion 230) of the lower container 2. For example, (i) the position of the lower end of the bottom wall protrusion 18 is positioned higher than the position of the lower end of the corner protrusion 16, i.e., the height of the bottom wall protrusion 18 from the lower surface 12A of the long-side base portion 12 to the lower end of the bottom wall protrusion 18 is lower than the height of the corner protrusion 16 from the lower surface 12A of the long-side base portion 12 to the lower end of the corner protrusion 16, and (ii) in the direction along the side of the long-side sidewall portion 20, the surface of the corner protrusion 16 of the container 1 that faces the bottom wall protrusion 18 and the surface that faces the corner protrusion 16 of the bottom wall protrusion 18 of the container 1 are positioned higher than the height of the corner protrusion 16 of the long-side base portion 12. By setting the first distance between the surface opposite to the surface of the bottom wall protrusion 18 facing the container 2 and the second distance between the opposing portion 255 of the container 2 and the surface of the protrusion receiving portion 270 of the container 2 that is farthest from the opposing portion 255, (iii) by making the size of the protrusion receiving portion 270 of the container 2 smaller than the size of the main receiving portion 250 in the direction along the side edge of the short side side wall portion 230, the bottom wall protrusion 18 of the upper container 1 is configured not to be received by the protrusion receiving portion 270 of the lower container 2.

[0061] When sliding and stacking a container 1 against multiple containers 2 located below, the corner protrusion 16 of the upper container 1 is brought into contact with the upper end surface 256A of the regulating protrusion 256 of the lower container 2, and the corner protrusion 16 is slid on the upper end surface 256A. The corner protrusion 16 of the upper container 1 is guided into the main receiving portion 250 of the container 2 by coming into contact with the rail portion 257 of the container 2. In the inward / outward direction of the container 2, the inner surface of the rail portion 257 facing the inside of the container 2 functions as a guide surface that guides the corner protrusion 16 of the upper container 1 into the main receiving portion 250 of the container 2. Furthermore, when the corner protrusion 16 of the upper container 1 is slid in a direction along the side edge of the short side wall portion 230 of the container 2 to perform sliding stacking, the corner protrusion 16 of the upper container 1 abuts against the rail portion 252 formed on the short side side wall portion 230 of the container 2, and is guided into the main receiving portion 250 of the container 2.

[0062] As shown in FIG. 9 , when a container 1 is placed above a plurality of containers 2, the partition 14 is located between a plurality of regulating protrusion receiving portions 19 that are lined up in a direction along the side of the long-side sidewall portion 220 of the container 2 on which the plurality of regulating protrusions 256 are formed, i.e., in a direction along the side of the short-side sidewall portion 30 of the container 1. In other words, when a container 1 is placed above a plurality of containers 2, the partition of the upper container 1 is received in the recess 280 of each lower container 2. When a container 1 is placed above a plurality of containers 2, the partition 14 that is located outside the container 1 relative to the regulating protrusion receiving portions 19 in a direction along the side of the short-side sidewall portion 30 of the container 1 is received in a space formed between the wall 251 and the regulating protrusion 256 in a direction along the side of the long-side sidewall portion 220 of the container 2.

[0063] According to the container set 100 of the above-described embodiment, the container 2 has a recess 280, so when the container 1 is placed above multiple containers 2, the partition 14 of the container 1 is accommodated in the recess 280. This allows the height of the container set 100 to be reduced when stacked. Furthermore, the partition 14 is formed between multiple restricting protrusion receiving portions 19. That is, it is not necessary to form a groove extending along the side of the short-side side wall portion 30 in the bottom wall forming portion 10 of the container 1 to receive the restricting protrusion 256 of the container 2. This reduces the reduction in strength of the bottom wall forming portion 10 of the container 1.

[0064] Furthermore, since the restricting protrusion 256 of the container 2 is configured not to be received in the partition portion 14 of the container 1, when the container 1 is slid and stacked on top of multiple containers 2, it is unlikely to get caught on the restricting protrusion 256 of the container 2, and the sliding stacking can be performed relatively smoothly. This improves the ease of stacking. Furthermore, when stacked, the restricting protrusion 256 of the container 2 is received in the restricting protrusion receiving portion 19 of the container 1, making it possible to restrict the horizontal movement of the upper container 1. This prevents the load from collapsing due to vibrations during transport by truck in a stacked state.

[0065] Furthermore, the containers 2 are formed with main receiving portions 250 that receive the corner projections 16 of the containers 1 when stacked. Therefore, in addition to the restricting projections 256 of the containers 2 restricting horizontal movement of the containers 1, the main receiving portions 250 of the containers 2 can also restrict horizontal movement of the containers 1. This improves stacking stability. Furthermore, in the direction along the lateral edges of the long-side sidewall portions 20 of the containers 1, both ends and the middle portion of the upper container 1 can be supported by the restricting projections 256 (or recesses 280) and main receiving portions 250 of the lower containers 2, thereby stabilizing the stacking.

[0066] Furthermore, the regulating protrusion 256 of the container 2 includes an opposing portion 258. Therefore, the opposing portion 258 of the lower container 2 abuts against the frame portion 190 of the regulating protrusion receiving portion 19 of the upper container 1, so that when the container 1 is stacked above multiple containers 2, it is possible to suitably restrict movement of the container 1 in a direction along the side of the short-side side wall portion 30 of the upper container 1. Furthermore, because the opposing portion 258 of the lower container 2 abuts against the corner protrusion 16 of the upper container 1, it is possible to suitably restrict movement of the container 1 in a direction along the side of the short-side side wall portion 30 of the upper container 1 when the container 1 is stacked above multiple containers 2.

[0067] [Modification] Modifications of the present invention will be described below. For ease of explanation, components having the same functions as those described in the above embodiment will be denoted by the same reference numerals, and their description will not be repeated. The partition section 14A and the restricting protrusion receiving section 19A of the container 1A according to this modification have configurations different from those of the partition section 14 and the restricting protrusion receiving section 19 of the container 1. Furthermore, the wall 2510A of the main receiving section 250 of the container 2A according to this modification has a configuration different from that of the wall 251A of the main receiving section 250 of the container 2.

[0068] As indicated by reference numeral 300 in FIG. 10 , the bottom wall component 10 of the container 1A includes a partition 14A. The partition 14A is composed of a first partition 141 and a second partition 142. The first partition 141 is formed on most of the lower surface of the bottom wall 11. The second partition 142 is formed between the two restricting protrusion receiving portions 19A in the direction along the side edges of the short-side sidewall 30. The first partition 141 is formed on both sides of the second partition 142 in the direction along the long sides of the long-side sidewall 20. The partition 14A extends in the direction along the side edges of the short-side sidewall 30 and includes a pair of boundary walls 143 that form the boundary between the first partition 141 and the second partition 142. 10, the second partition 142 is formed so that its height H3 in the vertical direction is smaller than the height H4 in the vertical direction of the first partition 141. By making the height H3 smaller than the height H4 in this way, the amount of depression of the recess 280 in the long-side side wall 220 in the vertical direction, that is, the height of the recess 280 in the long-side side wall 220 in the vertical direction, can be increased.

[0069] As indicated by reference numeral 300 in FIG. 10 , the bottom wall component 10 of the container 1A includes a restricting protrusion receiving portion 19A. The restricting protrusion receiving portion 19A is formed on the underside of the bottom wall 11 and is a portion where the underside ribs that constitute the partition portion 14A are not formed. The restricting protrusion receiving portion 19A receives the restricting protrusion 256 of the container 2A when the container 1A is stacked above the container 2A, and is formed to correspond to the position of the restricting protrusion 256 of the container 2A in the stacked state. The restricting protrusion receiving portion 19A is composed of a first frame portion 191 and a pair of second frame portions 192. The first frame portion 191 is composed of a pair of long-side ribs extending in a direction along the side edges of the long-side sidewall portion 20 and a pair of short-side ribs extending in a direction along the side edges of the short-side sidewall portion 30, forming a substantially rectangular frame when viewed from above and defining a space for receiving the restricting protrusion 256.

[0070] As indicated by reference numeral 301 in FIG. 10 , the long-side rib of the first frame 191 located on the outside of the container 1A and the pair of short-side ribs of the first frame 191 are connected to the first partition 141, and their vertical heights are the same as the vertical height of the first partition 141. The long-side rib of the first frame 191 located on the inside of the container 1A is connected to the second partition 142, and their vertical heights are the same as the vertical height of the second partition 142. As indicated by reference numeral 300 in FIG. 10 , the ends of the short-side ribs of the first frame 191 on the inside of the container 1A are connected to the boundary walls 143. That is, the width of the first frame 191 in the direction along the long-side sidewalls 20 is the same as the width between the pair of boundary walls 143 in the direction along the long-side sidewalls 20. Note that a portion of the long side rib of the first frame portion 191 located inside the container 1A may be configured to connect to the second partition portion 142. In this case, the width of the first frame portion 191 in the direction along the long side side wall portion 20 is wider than the width between the pair of boundary walls 143 in the direction along the long side side wall portion 20. Also, a pair of long side ribs and a pair of short side ribs of the first frame portion 191 may be configured to connect to the second partition portion 142. In this case, the width of the first frame portion 191 in the direction along the long side side wall portion 20 is narrower than the width between the pair of boundary walls 143 in the direction along the long side side wall portion 20.

[0071] The second frame portion 192 is a rib that connects to the long-side rib of the first frame portion 191 located outside the container 1A and extends in a direction along the side of the short-side side wall portion 30. The pair of second frame portions 192 are formed spaced apart from each other in a direction along the side of the long-side side wall portion 20. Of the long-side ribs of the first frame portion 191 located outside the container 1A, no long-side rib is formed between the pair of second frame portions 192. The width between the pair of second frame portions 192 in the direction along the long-side side wall portion 20 is narrower than the width of the first frame portion 191 in the direction along the long-side side wall portion 20. The surfaces of the pair of second frame portions 192 facing outward from the container 1A may be connected to the first partition portion 141. When stacked, the wall 2510A of the lower container 2A is received between the pair of second frame portions 192. That is, the pair of second frame portions 192 define a space that receives the wall 2510A of the container 2A located below. The space defined by the pair of second frame portions 192 for receiving the wall 2510A is continuous with the space defined by the first frame portion 191 for receiving the restricting protrusion 256. The space including the first frame portion 191 (restricting protrusion receiving portion 19A) and the second frame portion 192 is substantially T-shaped when viewed from the top and bottom. The first frame portion 191 (long side ribs, short side ribs) and the second frame portion 192 (ribs) may be part of the lower surface ribs.

[0072] As shown in FIG. 11, the wall 2510A extending in a direction along the side of the long-side sidewall portion 220 of the container 2A is connected to the restricting protrusion 256 (and the rail portion 257). That is, the wall 2510A and the restricting protrusion 256 (rail portion 257) are continuous in the direction along the side of the long-side sidewall portion 220. As shown in FIG. 12, when a container 1A is stacked above multiple containers 2A, the restricting protrusion 256 of each container 2A is received in the first frame portion 191, and the wall 2510A of each container 2A is housed between a pair of second frame portions 192. Furthermore, the second partition portion 142 of the container 1A is received in the recess 280 of each container 2A. A corner protrusion 16 is also provided near the center in the direction along the side edge of the long side wall portion 20 of container 1A, and the corner protrusion 16 provided near the center of the long side wall portion 20 of container 1A is received in the main receiving portion 250 of container 2A located below the center of container 1A in the direction along the side edge of the long side wall portion 20.

[0073] The present invention 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 invention. [Explanation of symbols]

[0074] 1, 2 containers 10, 210 Bottom wall component 14 Compartment 16, 216 corner protrusion 19. Regulating protrusion receiving portion 20, 220 Long side wall 30, 230 Short side wall 250 Main Receptor 258 Opposite part 256 Regulatory protrusion 280 recess

Claims

1. A container set including a first container and a second container that can be stacked above a plurality of the first containers arranged horizontally, The first container comprises: a first container bottom wall component having a generally rectangular shape in plan view; a first container side wall portion extending upward from each side edge portion of the first container bottom wall component, The first container side wall portion is a plurality of first container restricting protrusions protruding upward from an upper surface of the first container sidewall; a first container recess formed between the plurality of first container restricting protrusions in a direction along the side edge of the first container sidewall portion on which the first container restricting protrusions are formed, The second container is a second container bottom wall component having a generally rectangular shape in plan view; a second container side wall portion extending upward from each side edge portion of the second container bottom wall component, The second container bottom wall component is a second container partitioning section that partitions a plurality of spaces that open downward by a plurality of second container lower surface ribs that protrude downward from the lower surface of the second container bottom wall component, and a plurality of second container receiving sections that receive the first container regulating protrusions when the second containers are placed above the plurality of first containers, the second container partition is configured to be received in the first container recess when the second container is disposed above the plurality of first containers; The first container restricting protrusion is configured so as not to be received in the second container partitioning portion by making the size of the first container restricting protrusion larger than the opening area of ​​the second container partitioning portion, or by making the shape of the opening of the second container partitioning portion different from the shape of the first container restricting protrusion. Container set.

2. the second container has a second container corner protrusion located at a bottom wall corner of the second container bottom wall component and protruding downward from a lower surface of the second container bottom wall component, The first container includes a first container protrusion receiving portion formed adjacent to the first container restricting protrusion, located at a container corner where the first container side wall portions are connected, and configured to receive the second container corner protrusion. The container set according to claim 1 .

3. the first container regulating protrusion has a surface facing in a direction along the side edge of the first container side wall portion on which the first container regulating protrusion is formed, and includes a first container opposing portion opposing the second container corner protrusion received in the first container protrusion receiving portion; The container set according to claim 2 .

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