Container set and container

Abstract

To provide a container set that allows stable stacking when a foldable first container is stacked on top of a second container that does not have foldable structure.SOLUTION: A container set includes a first container and a second container that can be stacked on top of each other. The first container includes a first bottom wall portion that is approximately rectangular in plan view, a bottom wall component that includes a pair of base portions that protrude upward from a pair of opposing side edges of the first bottom wall portion, and a pair of opposing pivotal side wall portions that are pivotally connected to the respective base portions. The second container includes a second bottom wall portion having an approximately rectangular shape in plan view, and a pair of fixed side wall portions erected upward from the respective opposing side edges of the second bottom wall portion. The bottom wall component has a bottom plate portion having an approximately rectangular plate shape, a support portion protruding downward from an underside of the bottom plate portion, and a plurality of bottom protrusions protruding downward from an underside of first corner portions at four corners of the bottom wall component.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Various foldable containers have been proposed. Patent Document 1 discloses a folding container having a support rib on the underside of its bottom wall component. When folding containers are stacked on top of each other, the support rib of the upper folding container is inserted into the inner periphery of the side wall of the lower folding container, restricting horizontal movement of the upper folding container. The bottom wall component also has a plurality of bottom reinforcing portions that protrude downward from the periphery of the underside. An assembled storage recess is provided at the upper end of the side wall, and when the assembled folding containers are stacked on top of each other, the bottom reinforcing portions of the upper folding container are accommodated in the assembled storage recess provided at the upper end of the side wall of the lower folding container. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-43938 Summary of the Invention [Problem to be solved by the invention]

[0004] Collapsible containers and general containers without a folding structure may be stacked on top of each other. In a conventional configuration, when a foldable container is stacked on top of another foldable container, if the general container on the bottom tier does not have an assembly-time storage recess for storing the bottom reinforcing part, the bottom reinforcing part of the upper foldable container comes into contact with the upper end (flange part) of the side wall part of the lower container. As a result, the horizontal movement of the upper foldable container is not restricted, resulting in a problem that the upper foldable container cannot be stacked stably.

[0005] An object of one aspect of the present invention is to provide a container set and containers that allow stable stacking when a foldable first container is stacked on top of a second container that does not have a foldable structure. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a container set according to one aspect of the present invention is a container set including a first container and a second container that can be stacked on top of each other, wherein the first container comprises a first bottom wall portion that is generally rectangular in plan view, a bottom wall component having a pair of opposing base portions that protrude upward from a pair of opposing side edges of the first bottom wall portion, and a pair of opposing pivoting side wall portions that are pivotally connected to each of the opposing pairs of base portions, and the first container has two states: a folded state in which each of the opposing pairs of pivoting side wall portions is folded by pivoting each of the opposing pairs of pivoting side wall portions inward, and an assembled state in which each of the opposing pairs of pivoting side wall portions is erected from the folded state. and the second container is capable of changing its state between two states, and the second container comprises a second bottom wall portion having a generally rectangular shape in a plan view, and a pair of opposing fixed side wall portions that are erected upward from each pair of opposing side edges of the second bottom wall portion, and the bottom wall portion has a generally rectangular bottom plate portion that forms the inner bottom surface of the first container, a support portion that protrudes downward from the underside of the bottom plate portion, and a plurality of bottom protrusions that protrude downward from the underside of first corner portions at the four corners of the bottom wall portion, and when the first container is stacked on top of the second container, the support portions are accommodated on the inner peripheral sides of each pair of opposing fixed side wall portions, and the bottom protrusions are arranged outside the second corner portions at the four corners of the outer periphery of the upper end of the second container.

[0007] A container according to one aspect of the present invention comprises a first bottom wall portion having a generally rectangular shape in a plan view, a bottom wall component including a pair of opposing base portions that protrude upward from a pair of opposing side edges of the first bottom wall portion, and a pair of opposing pivoting side wall portions that are pivotally connected to each of the opposing pairs of base portions, and the container can be in a folded state in which each of the opposing pairs of pivoting side wall portions is folded by pivoting each of the opposing pairs of pivoting side wall portions inward, and an assembled state in which each of the opposing pairs of pivoting side wall portions is erected from the folded state. The bottom wall constituent portion has a substantially rectangular bottom plate portion that constitutes the inner bottom surface of the container, a support portion that protrudes downward from the underside of the bottom plate portion, and a plurality of bottom protrusions that protrude downward from the undersides of first corner portions at the four corners of the bottom wall constituent portion, the rotating side wall portion has a first receiving portion that receives the bottom protrusion of the upper container when the containers are stacked in an assembled state, and the base portion has a second receiving portion that receives the bottom protrusion of the upper container when the containers are stacked in a folded state. [Effects of the Invention]

[0008] According to one aspect of the present invention, when a foldable first container is stacked on top of a second container that does not have a foldable structure, the stacking can be stable. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing an assembled state of the foldable first container according to the present embodiment. [Figure 2] FIG. 4 is a perspective view showing the first container with the second side wall portion folded. [Figure 3] 10 is a perspective view showing the first container in a folded state with the first side wall portion folded. FIG. [Figure 4] 2 is a perspective view of the first container shown in FIG. 1 as seen from the bottom side. FIG. [Figure 5] FIG. 5 is a partially enlarged perspective view of a portion V in FIG. 4. [Figure 6] FIG. 2 is a partially enlarged perspective view of a portion VI in FIG. [Figure 7]FIG. 7 is a partially enlarged perspective view of a portion VII of FIG. 3. [Figure 8] FIG. 2 is a perspective view showing the appearance of a second container without a folding structure according to the present embodiment. [Figure 9] FIG. 9 is a perspective view of the second container shown in FIG. 8 as seen from the bottom side. [Figure 10] FIG. 10 is a perspective view showing a state in which a second container is stacked on top of a first container, and further, a first container is stacked on top of the second container. [Figure 11] FIG. 11 is a partially enlarged view taken along the arrow XI in FIG. [Figure 12] FIG. 12 is a partially enlarged cross-sectional view taken along the line XII-XII of FIG. 10. [Figure 13] FIG. 2 is a perspective view showing a state in which first containers in an assembled state are stacked. [Figure 14] FIG. 14 is a partially enlarged cross-sectional view taken along the line XIV-XIV in FIG. 13. [Figure 15] FIG. 10 is a perspective view showing a state in which first containers in a folded state are stacked one on top of the other. [Figure 16] FIG. 16 is a partially enlarged cross-sectional view taken along the line XVI-XVI of FIG. 15. [Figure 17] FIG. 10 is a partially enlarged cross-sectional view showing an example of a side wall recess provided in a first side wall of a first container according to another embodiment. [Figure 18] FIG. 10 is a partially enlarged cross-sectional view showing an example of a base recess provided in a first base of a first container according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described in detail below with reference to Figures 1 to 16. As shown in Figure 10, a container set 1 includes a first container 2 and a second container 3 that can be stacked on top of each other.

[0011] [Overview of Container 1 2] First, the schematic configuration of the first container 2 will be described with reference to Figures 1 to 7. As shown in Figure 1, the first container 2 has a rectangular parallelepiped shape with an open top, and is foldable as shown in Figures 2 and 3. The foldable first container 2 is made of resin, such as polypropylene.

[0012] [Configuration of bottom wall component 11] As shown in FIG. 1, the first container 2 includes a bottom wall component 11 having a first bottom wall portion 11A, a pair of first pivotable side walls 12, and a pair of second pivotable side walls 13. The bottom wall component 11 is generally rectangular in plan view and is located at the bottom of the first container 2. The bottom wall component 11 includes first base portions 11B that protrude upward from a pair of opposing long side edges in the longitudinal direction of the generally rectangular first bottom wall portion 11A in plan view. The bottom wall component 11 also includes second base portions 11C that protrude upward from opposing short side edges in the lateral direction of the first bottom wall portion 11A and are shorter in height than the first base portion 11B. The first base portion 11B and the second base portion 11C function as base portions.

[0013] 1 to 3, the first container 2 includes a pair of first pivoting side walls 12 pivotally connected to each of the first bases 11B and a pair of second pivoting side walls 13 pivotally connected to each of the second bases 11C. The first pivoting side walls 12 and the second pivoting side walls 13 are configured to be movable between an assembled state in which they are erected above the first bases 11B and the second bases 11C, respectively, and a folded state in which they are tilted toward the center of the first bottom wall 11A and folded parallel to the first bottom wall 11A. The first pivoting side walls 12 and the second pivoting side walls 13 function as pivoting side walls.

[0014] 1 and 2, the length by which first base portion 11B protrudes upward from first bottom wall portion 11A is longer than the length by which second base portion 11C protrudes upward from first bottom wall portion 11A. Furthermore, the position of first bearing portion 15 of first base portion 11B, which rotatably supports first pivot side wall portion 12, is located higher than the position of second bearing portion 16 of second base portion 11C, which rotatably supports second pivot side wall portion 13. Furthermore, each second base portion 11C is provided to connect the inner surfaces of both longitudinal end portions of a pair of opposing first base portions 11B, and the longitudinal length of first base portion 11B is formed to be approximately the same as the length of the long side in the longitudinal direction of first bottom wall portion 11A.

[0015] 2 and 3, the bottom wall constituent part 11 has four auxiliary protrusions 18 that protrude above the second base part 11C from both ends of the pair of first base parts 11B and are connected to the upper surface side of the second base part 11C. This increases the vertical length of the auxiliary protrusions 18, thereby improving the mechanical strength of the bottom wall constituent part 11 and allowing the first containers 2 in the folded state to be stacked stably on top of each other.

[0016] [Folding and assembly instructions] When the assembled first container 2 is folded, the pair of second pivotable side walls 13 are first brought to the folded position as shown in Fig. 2, and then the pair of first pivotable side walls 12 are displaced to the folded position as shown in Fig. 3. As shown in Figs. 2 and 3, in the folded state of the first container 2, the second pivotable side walls 13 in the folded position overlap the top of the first bottom wall 11A, and the first pivotable side walls 12 in the folded position overlap the top of the second pivotable side walls 13.

[0017] The pair of second pivotable side walls 13 in the folded position are supported by abutting against the first bottom wall 11A, and the pair of first pivotable side walls 12 in the folded position are supported by abutting against the pair of second pivotable side walls 13. Therefore, when the first container 2 is changed from the folded position to the assembled position, the pair of first pivotable side walls 12 are first raised and then the pair of second pivotable side walls 13 are raised to achieve the assembled position.

[0018] 1, a pair of locking members 31 are provided above the outer surfaces of the pair of second pivoting side walls 13 to restrict rotational displacement of the second pivoting side walls 13 toward the inside of the first container 2 when the first container 2 is in the assembled state. When the first container 2 is in the assembled state, the pair of locking members 31 are configured to be displaceable between a protruding position where they are inserted into and locked into the lock engaging portions 26 of the first pivoting side walls 12 shown in FIG. 2, and a retracted position where they are removed from the lock engaging portions 26 and the locked state is released.

[0019] The pair of locking members 31 are operated by operating an operating unit 32 shown in Fig. 1. The operating unit 32 is provided above the outer surfaces of the pair of second pivoting side walls 13, and in the approximate center in the left-right direction when viewed from the front. The position where the operating unit 32 is provided is not limited thereto, and it may be provided in any position that is easy for a user of the first container 2 to operate. The operating unit 32 can displace the pair of locking members 31 from the protruding position to the retracted position with a single operation.

[0020] [Configuration of the recess 35 of the first pivoting side wall portion 12] As shown in Fig. 2, each of the pair of first pivoting side walls 12 has a recess 35 cut out in an L-shaped cross section at the lower end of each of both longitudinal sides. As shown in Figs. 3 and 7, each recess 35 is provided to avoid interference with the auxiliary protrusion 18 when the first pivoting side wall 12 is in the folded position. When the first pivoting side wall 12 is in the folded position, a gap of a predetermined distance, for example, approximately 3 mm to 5 mm, is formed between the inner surface of the recess 35 and the side wall of the auxiliary protrusion 18. Note that this predetermined gap distance is shown as an example and may be set appropriately depending on the size of the first container 2, etc.

[0021] The recess 35 cut out in an L-shaped cross section is just one example, and recesses 35 cut out in a U-shaped cross section, a rectangular groove cross section, or the like may be provided at the lower ends of both longitudinal side sections of the first pivoting side wall 12. When the first pivoting side wall 12 is in the folded position, interference with the auxiliary protrusion 18 can be avoided by configuring the recess 35 cut out in a U-shaped cross section, a rectangular groove cross section, or the like to be able to enter the auxiliary protrusion 18.

[0022] [Configuration of the lower support portion 39] As shown in FIG. 4, the first container 2 is provided with a substantially rectangular bottom plate 38 on the upper surface of the first bottom wall 11A, constituting the inner bottom surface on the inner circumferential side of the area where the first base 11B and the second base 11C are formed. The first container 2 also has a support portion 39 protruding downward from the underside of the bottom plate 38. The support portion 39 has lattice-like ribs formed inside an outer peripheral rib portion 39A that is substantially rectangular in plan view, and is arranged at approximately equal intervals along a pair of long sides opposite the four corners of the underside of the bottom plate 38, for example, in two rows of four. The arrangement of the support portion 39 is not limited to two rows of four, but may be one, or may be set appropriately depending on the size of the first container 2, etc.

[0023] The protruding height of the support portions 39 from the bottom plate portion 38 is slightly lower than the height from the upper end surfaces of both ends of the first base portion 11B when the first container 2 is in the folded state to the upper end surface of the first pivoting side wall portion 12 in the folded position. Therefore, as shown in Fig. 13, when the assembled first containers 2 are stacked, the support portions 39 provided on the underside of the upper first container 2 are fitted into the inner peripheral sides of the first pivoting side wall portion 12 and the second pivoting side wall portion 13 of the lower first container 2. Furthermore, as shown in Fig. 15, when the folded first containers 2 are stacked, the support portions 39 provided on the underside of the upper first container 2 are fitted into the inner peripheral sides of the first base portion 11B and auxiliary protrusions 18 of the lower first container 2.

[0024] [Configuration of bottom protrusion 42 and chamfered portion 45] 4 and 5, a bottom protrusion 42 that protrudes downward and has a rectangular shape in a plan view is provided on the underside of each of the first corner portions 41 at the four corners of the bottom wall constituent portion 11, i.e., on the underside of each of the end portions of the pair of first base portions 11B. The long side of the bottom protrusion 42 is located on the underside of each end portion of the first base portion 11B near the outer side edge of the first container 2, along the longitudinal direction of the first base portion 11B.

[0025] The protrusion height of the bottom protrusion 42 from the lower surface of the first base portion 11B is set to be equal to or less than the thickness of the upper end flange portion 12A protruding outward from the upper end of the first pivoting side wall portion 12. For example, the height of the bottom protrusion 42 from the lower surface of the first base portion 11B is approximately 0.2 mm to 2 mm. Note that the height of the bottom protrusion 42 from the lower surface of the first base portion 11B is just an example, and may be set appropriately depending on the size of the first container 2, etc.

[0026] Additionally, the ridges of the first corner portions 41 at the four corners of the bottom wall constituent portion 11, i.e., the lower ends of the corners, are provided with chamfered portions 45 that slope downward from the outer surface toward the inside of the first container 2. As shown in Fig. 5, the bottom protrusion 42 is located near the lower corner of the approximately arc-shaped chamfered portion 45 that widens from top to bottom. Additionally, a diagonal reinforcing rib 46 is provided between the center of the lower edge of the chamfered portion 45 and the corner of the support portion 39, connecting the bottom surface of the bottom wall constituent portion 11 to the back side of the chamfered portion 45.

[0027] [Configuration of the first receiving portion 47] 1 and 6, the upper flanges 12A on both sides of the pair of first pivoting sidewalls 12 are provided with first receiving portions 47 that receive the bottom protrusions 42 provided on the underside of the upper first container 2 when the assembled first containers 2 are stacked on top of each other (see FIG. 13). The first receiving portions 47 are recessed across the entire width of the first receiving portions 47, at portions that face the recesses 35 of the upper flanges 12A in the vertical direction, with a width substantially equal to the longitudinal width of the recesses 35 of the first pivoting sidewalls 12 and toward the inward side of the first container 2 to a depth greater than the lateral width of the bottom protrusions 42. Therefore, the first receiving portions 47 are cut out in a generally L-shape in plan view, with a narrow width toward the inward side of the first pivoting sidewalls 12.

[0028] [Configuration of second receiving portion 51] 1, 3, 6, and 7, recesses 49 having a rectangular cross section are formed at both ends of the pair of first base portions 11B, and have approximately the same width as the longitudinal width of the first pivoting side wall portion 12 of the recesses 35 provided at the lower ends of both sides of the first pivoting side wall portion 12. A second receiving portion 51 is provided at the upper end on the opening side of each recessed portion 49 to receive the bottom protrusion 42 provided on the underside of the upper first container 2 when the first containers 2 are stacked in a folded state (see FIG. 15).

[0029] The second receiving portion 51 is recessed toward the second base portion 11C over the entire width of the upper end portion on the opening side of the recessed portion 49, to a depth greater than the width in the short direction of the bottom protrusion 42. Therefore, the second receiving portion 51 is cut out in a generally L-shape in plan view, with a narrow width toward the inward side of the first base portion 11B. As shown in FIG. 6, in the assembled state of the first container 2, the second receiving portion 51 is disposed vertically below the first receiving portion 47. A space 52 is formed between the upper end of the second receiving portion 51 and the inner circumferential surface of the recessed portion 35.

[0030] The first receiving portion 47 has the outer edge of the upper flange portion 12A cut out and recessed inward, and the second receiving portion 51 has the upper outer edges of both ends of the first base portion 11B cut out and recessed inward, but the first receiving portion 47 and the second receiving portion 51 do not have to be cut out. For example, the first receiving portion 47 and the second receiving portion 51 may be through holes into which the bottom protrusion 42 can enter.

[0031] [Outline of Second Container 3] Next, the schematic configuration of the second container 3 will be described with reference to FIGS. 8 to 12. As shown in FIGS. 8 and 9, the second container 3 is a rectangular parallelepiped box with an open top and does not have a foldable structure. As shown in FIG. 10, the second container 3 is formed so that the opening that opens upward is approximately the same size as the opening of the first container 2 in the assembled state, and the height from the bottom to the top is greater than the height from the bottom to the top of the first container 2. The second container 3 is made of a resin such as polypropylene. Note that the height from the bottom to the top of the second container 3 may be equal to or less than the height from the bottom to the top of the first container 2.

[0032] As shown in Fig. 8, the second container 3 includes a second bottom wall 61, a pair of first fixed side walls 62, and a pair of second fixed side walls 63. The second bottom wall 61 is generally rectangular in plan view and is located at the bottom of the second container 3. The first fixed side walls 62 extend upward from a pair of opposing long side edges in the longitudinal direction of the second bottom wall 61, which is generally rectangular in plan view. The second fixed side walls 63 extend upward from a pair of opposing short side edges in the lateral direction of the second bottom wall 61, which is generally rectangular in plan view.

[0033] [Configuration of second corner portion 66] An upper flange 65 extends horizontally outward from the upper end of each first fixed side wall 62 and each second fixed side wall 63, and is provided around the entire circumference of the opening. The width of the upper flange 65 in the extending direction is approximately the same as the width of the upper flange 12A provided at the upper end of each first pivotable side wall 12 of the first container 2. In addition, second corner portions 66, which are arc-shaped in plan view and have a second radius of curvature R2, are provided at the four corners of the outer periphery of the upper flange 65. As shown in FIG. 11 , the second radius of curvature R2 of the outer periphery of the second corner portion 66 is set to be larger than the first radius of curvature R1 of the outer periphery of the first corner portion 41 of the first container 2.

[0034] 10, when the first container 2 is stacked above the second container 3, the support portions 39 on the underside of the upper first container 2 are fitted into the inner peripheries of the first fixed sidewall portions 62 and second fixed sidewall portions 63 of the lower second container 3. Furthermore, when the assembled first container 2 is stacked above the second container 3 as shown in FIG. 11, the outer periphery of the second corner portion 66 is located slightly inside the first receiving portion 47 that can receive the bottom protrusion 42. As a result, as shown in FIG. 12, the bottom protrusions 42 on the underside of the first container 2 stacked above the second container 3 are located near the outside of the outer peripheries of the second corner portions 66 at the four corners of the second container 3, restricting horizontal movement of the first container 2.

[0035] 8, a lower flange 71 extends horizontally outward from the lower end of each of the first fixed side walls 62 and each of the second fixed side walls 63, and is provided around the entire circumference of the second bottom wall 61. The lower flange 71 is formed to have approximately the same width as the width of the upper end flange 12A provided at the upper end of each of the first pivotable side walls 12 of the first container 2. In addition, the four corners of the outer periphery of the lower flange 71 are formed into an arc shape with a second radius of curvature R2 in a plan view.

[0036] A plurality of vertical ribs 72 and horizontal ribs 73 are provided on the outer surface of each of the first fixed side walls 62 and second fixed side walls 63, between the upper flange 65 and the lower flange 71. A handle hole 75 is formed above each of the second fixed side walls 63, approximately in the center in the left-right direction when viewed from the front. The handle hole 75 is used when holding the second container 3.

[0037] [Configuration of the lower support portion 69] As shown in FIG. 9 , the second container 3 includes a substantially rectangular bottom plate 68 on the upper surface of the second bottom wall 61, which defines the inner bottom surface of the second container 3 inward from the area where the first fixed side wall 62 and the second fixed side wall 63 are formed. The second container 3 also includes a support portion 69 protruding downward from the lower surface of the bottom plate 68. The bottom plate 68 is approximately the same size as the bottom plate 38 of the first container 2. The support portion 69 includes lattice-shaped ribs on the inner side of an outer peripheral rib portion 69A that is substantially rectangular in plan view. The support portions 69 are arranged at substantially equal intervals along a pair of long sides that face the four corners of the lower surface of the bottom plate 68, for example, in two rows of four. The arrangement of the support portions 69 is not limited to two rows of four, but may include only one support portion, or may be appropriately determined depending on the size of the second container 3, etc.

[0038] The protruding height of the support portions 69 from the bottom plate portion 68 is set to, for example, approximately the same height as the protruding height of the support portions 39 of the first container 2 from the bottom plate portion 38. Therefore, as shown in Fig. 10, when the second container 3 is stacked above the assembled first container 2, the support portions 69 provided on the underside of the upper second container 3 are fitted into the inner peripheral sides of the first pivoting side wall portion 12 and the second pivoting side wall portion 13 of the lower first container 2. Furthermore, although not shown, when the second container 3 is stacked above the folded first container 2, the support portions 69 provided on the underside of the upper second container 3 are fitted into the inner peripheral sides of the pair of opposing first base portions 11B and auxiliary protrusions 18 of the lower first container 2.

[0039] [Stacking configuration of first containers 2 in assembled state] Next, stacking of the assembled first containers 2 configured as described above will be described with reference to Figures 13 and 14. As shown in Figure 13, when the assembled first containers 2 are stacked, the support portions 39 provided on the underside of the upper first container 2 are fitted into the inner peripheral sides of the first pivoting side wall 12 and the second pivoting side wall 13 of the lower first container 2. Furthermore, as shown in Figure 14, the bottom protrusions 42 protruding from the undersides of the first corner portions 41 of the upper first container 2 are received in first receiving portions 47 formed on the upper flange portions 12A on both side edges of the first pivoting side wall portions 12 of the lower first container 2.

[0040] Therefore, when assembled first containers 2 are stacked, horizontal movement of the upper first container 2 can be restricted by the fit of the support portions 39 of the upper first container 2 with the inner circumferential sides of the first pivoting side wall 12 and second pivoting side wall 13 of the lower first container 2. Furthermore, the bottom protrusions 42 of the upper first container 2 are received in the first receiving portions 47 of the lower first container 2, restricting horizontal movement of the upper first container 2 and allowing for stable stacking.

[0041] Furthermore, by forming the first receiving portions 47 on the upper end flange portions 12A of both side edges of the first pivoting side wall portion 12, it is possible to form both side edges of the first pivoting side wall portion 12 into an arc shape with a first radius of curvature R1 in a plan view. As a result, it is possible to increase the thickness in the inward and outward directions of the base ends of the portions protruding inward from both side edges of the first pivoting side wall portion 12, thereby improving rigidity and enabling stable stacking.

[0042] [Stacking configuration of first containers 2 in a folded state] Next, stacking of first containers 2 in the folded state configured as described above will be described with reference to Figures 15 and 16. As shown in Figure 15, when first containers 2 in the folded state are stacked, the support portions 39 provided on the underside of the upper first container 2 are fitted into the inner periphery of the first base portion 11B and auxiliary protrusion 18 of the lower first container 2. Furthermore, as shown in Figure 16, the bottom protrusions 42 protruding from the underside of each first corner portion 41 of the upper first container 2 are received in second receiving portions 51 formed on both ends of the first base portion 11B of the lower first container 2.

[0043] Therefore, when first containers 2 are stacked in a folded state, horizontal movement of the upper first container 2 can be restricted by the fit of the support portions 39 of the upper first container 2 with the inner peripheries of the first base portion 11B and auxiliary protrusions 18 of the lower first container 2. Furthermore, the bottom protrusions 42 of the upper first container 2 are received in the second receiving portions 51 of the lower first container 2, restricting horizontal movement of the upper first container 2 and allowing for stable stacking.

[0044] As described above in detail, in the container set 1 according to this embodiment, when the assembled first container 2 is stacked on top of the second container 3, the support portions 39 protruding downward from the underside of the bottom plate portion 38 of the first container 2 are accommodated on the inner circumferential sides of the opposing first fixed side wall portions 62 and second fixed side wall portions 63 of the second container 3. In addition, the plurality of bottom protrusions 42 protruding downward from the underside of the first corner portions 41 at the four corners of the bottom wall forming portion 11 of the first container 2 are arranged outside the second corner portions 66 at the four corners of the outer periphery of the upper end of the second container 3.

[0045] As a result, when the foldable first container 2 is stacked above the second container 3 without a folding structure, the horizontal movement of the first container 2 can be restricted by the engagement of the support portions 39 with the inner peripheral sides of the first fixed side walls 62 and second fixed side walls 63. Furthermore, the bottom protrusions 42 are located outside the second corner portions 66, thereby restricting the horizontal movement of the first container 2. Therefore, even if the upper ends of the first fixed side walls 62 and second fixed side walls 63 of the second container 3 do not have receiving portions for receiving the bottom protrusions 42 of the first container 2, stable stacking is possible when the foldable first container 2 is stacked above the second container 3 without a folding structure.

[0046] Because the second radius of curvature R2 of the second corner portion 66 of the second container 3 is larger than the first radius of curvature R1 of the first corner portion 41 of the first container 2, when the first container 2 is stacked on top of the second container 3, the bottom protrusions 42 are located outside the second corner portions 66. As a result, when the first container 2 is stacked on top of the second container 3, the bottom protrusions 42 and the second corner portions 66 can restrict horizontal movement of the first container 2. Furthermore, because the outer periphery of the upper end of the second container 3 is positioned horizontally opposite the bottom protrusions 42, the first fixed side wall portions 62 and second fixed side wall portions 63 of the second container 3 can be prevented from opening outward.

[0047] When assembled first containers 2 are stacked, the bottom protrusions 42 of the upper first container 2 are received in the first receiving portions 47 of the lower first container 2. When folded first containers 2 are stacked, the bottom protrusions 42 of the upper first container 2 are received in the second receiving portions 51 of the lower first container 2. Therefore, whether the first containers 2 are stacked in the assembled or folded state, horizontal movement can be restricted, allowing for stable stacking. Furthermore, because recesses 35 are formed at the lower ends of both sides of each first pivoting sidewall 12, loads generated when assembled first containers 2 are stacked are less likely to be applied to the first base 11B around the second receiving portions 51. As a result, when assembled first containers 2 are stacked, damage to the first base 11B around the second receiving portions 51 can be prevented.

[0048] When the first container 2 and the second container 3 are stacked on top of each other, each chamfered portion 45 can reduce the protrusion of the lower end of each first corner portion 41 of the first container 2, thereby preventing the first container 2 from getting caught on the upper end of the second container 3.

[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] 17, instead of the first receiving portions 47 cut out in a generally L-shape in plan view, first receiving portions 81 recessed inward in a generally groove-like shape in plan view that can receive the bottom protrusions 42 may be provided on the upper end flange portions 12A of both side edges of the pair of first pivoting sidewall portions 12. As a result, when assembled first containers 2 are stacked, the bottom protrusions 42 of the upper first container 2 are received in the first receiving portions 81 of the lower first container 2, making it possible to restrict horizontal movement of the upper first container 2 and achieving stable stacking.

[0051] [Variation 2] 18, instead of the second receiving portion 51 cut out in a generally L-shape in plan view, a second receiving portion 82 recessed inward in a generally groove-like shape in plan view that can receive the bottom protrusion 42 may be provided at the upper end on the opening side of the recessed portion 49 provided at both ends of the pair of first base portions 11B. As a result, when first containers 2 in a folded state are stacked, the bottom protrusions 42 of the upper first container 2 are received in the second receiving portions 82 of the lower first container 2, making it possible to restrict horizontal movement of the upper first container 2 and achieving stable stacking.

[0052] [Variation 3] For example, both ends of the upper flange portion 12A of the first pivoting side wall portion 12 of the first container 2 may be formed into an arc shape with the second radius of curvature R2 in a plan view, eliminating the need for the first receiving portion 47. As a result, the second radius of curvature R2 is larger than the first radius of curvature R1 of the first corner portion 41 of the first container 2, and therefore when assembled first containers 2 are stacked one on top of another, the bottom protrusions 42 are located outside both ends of the upper flange portion 12A.

[0053] As a result, when assembled first containers 2 are stacked on top of each other, the bottom protrusions 42 and the outer peripheries of both ends of the upper flange 12A can restrict horizontal movement of the upper first container 2. Furthermore, because the outer periphery of the upper end of the upper first container 2 is positioned horizontally opposite the bottom protrusions 42, it is possible to prevent the first pivoting side walls 12 and the second pivoting side walls 13 of the lower first container 2 from opening outward.

[0054] [Variation 4] For example, when the first container 2 is in the folded state, the pair of first pivoting side walls 12 or the pair of second pivoting side walls 13 may be arranged to overlap one another vertically. Furthermore, when the first container 2 is in the folded state, the pair of first pivoting side walls 12 and the pair of second pivoting side walls 13 may be arranged to be inclined rather than parallel to the bottom wall 11A.

[0055] [Variation 5] For example, the second base portion 11C may be higher than the first base portion 11B. Also, the position where the second bearing portion 16 is formed may be located higher than the position where the first bearing portion 15 is formed. Four auxiliary protrusions 18 may be provided on both end portions of the pair of second base portions 11C, protruding above the first base portion 11B and connected to the upper surface side of the first base portion 11B. Also, a pair of recesses 35 cut out in an L-shaped cross section may be provided on the lower ends of both side edges of the second pivoting side wall portion 13.

[0056] In this configuration, when the first container 2 in the assembled state is brought into the folded state, the pair of first pivoting side walls 12 are first brought into the folded position, and then the pair of second pivoting side walls 13 are displaced into the folded position. Therefore, when the first container 2 is brought into the assembled state from the folded state, the pair of second pivoting side walls 13 are raised, and then the pair of first pivoting side walls 12 are raised to bring into the assembled state.

[0057] Furthermore, upper flange portions 12A may be provided that protrude outward from the upper ends of the pair of second pivoting sidewall portions 13. First receiving portions 47 may be provided on the upper flange portions 12A on both side edges of the pair of second pivoting sidewall portions 13. Furthermore, recessed portions 49 that are recessed and have a rectangular cross section and have approximately the same width as the width of the recessed portions 35 provided on the lower ends of both side edges of the second pivoting sidewall portions 13 may be provided on both side edges of the pair of second base portions 11C. Second receiving portions 51 may be provided on the upper end of the opening side of each recessed portion 49. Furthermore, bottom protrusions 42 that protrude downward may be provided on the undersides of both end portions of the pair of second base portions 11C.

[0058] As a result, when the foldable first container 2 is stacked above the second container 3 without a folding structure, the horizontal movement of the first container 2 can be restricted by the engagement of the support portions 39 with the inner peripheral sides of the first fixed side walls 62 and second fixed side walls 63. Furthermore, the bottom protrusions 42 are located outside the second corner portions 66, thereby restricting the horizontal movement of the first container 2. Therefore, even if the upper ends of the first fixed side walls 62 and second fixed side walls 63 of the second container 3 do not have receiving portions for receiving the bottom protrusions 42 of the first container 2, stable stacking is possible when the foldable first container 2 is stacked above the second container 3 without a folding structure.

[0059] Furthermore, when assembled first containers 2 are stacked, the bottom protrusions 42 of the upper first container 2 are received in the first receiving portions 47 of the lower first container 2. When folded first containers 2 are stacked, the bottom protrusions 42 of the upper first container 2 are received in the second receiving portions 51 of the lower first container 2. Therefore, whether the first containers 2 are stacked in the assembled or folded state, horizontal movement can be restricted, allowing for stable stacking. Furthermore, because recesses 35 are formed at the lower ends of both sides of each second pivoting sidewall 13, loads generated when assembled first containers 2 are stacked are less likely to be applied to the second base 11C around the second receiving portions 51. As a result, when assembled first containers 2 are stacked, damage to the second base 11C around the second receiving portions 51 can be prevented. [Explanation of symbols]

[0060] 1 container set 2 1st container 3 Second container 11 Bottom wall component 11A 1st bottom wall part 11B First base 11C Second base 12 First rotating side wall 13 Second rotating side wall 35 recess 38 Bottom plate part 39 Support part 41 First corner 42 Bottom protrusion 45 Chamfered part 47, 81 First receptor 51, 82 Second receptor 52 Space 61 Second bottom wall 62 1st fixed side wall part 63 2nd fixed side wall part 66 Second corner

Claims

1. A container set including a first container and a second container that can be stacked on top of each other, The first container comprises: a first bottom wall portion having a generally rectangular shape in plan view; a bottom wall component including a pair of base portions that protrude upward from a pair of opposing side edges of the first bottom wall portion, respectively; a pair of opposing pivotal sidewall portions pivotally connected to the pair of opposing base portions, respectively; Equipped with the first container is capable of being displaced between a folded state in which each pair of opposing pivotable side wall portions is folded by pivoting each pair of opposing pivotable side wall portions inward, and an assembled state in which each pair of opposing pivotable side wall portions is erected from the folded state, The second container is a second bottom wall portion having a generally rectangular shape in plan view; a pair of fixed side wall portions that are erected upward from a pair of opposing side edge portions of the second bottom wall portion, The bottom wall component is a substantially rectangular bottom plate portion that constitutes an inner bottom surface of the first container; a support portion protruding downward from the lower surface of the bottom plate portion; a plurality of bottom protrusions protruding downward from the lower surfaces of first corner portions of the bottom wall component, When the first container is stacked on the second container, the support portions are accommodated on the inner peripheral sides of the pair of opposing fixed side wall portions, and the bottom protrusions are disposed outside the second corner portions of the four corners of the upper outer peripheral portion of the second container. A container set characterized by:

2. the first corner portion is formed in an arc shape having a first radius of curvature in a plan view, the second corner portion is formed in an arc shape in a plan view having a second radius of curvature larger than the first radius of curvature, 2. The container set according to claim 1.

3. The pivoting side wall portion is a first receiving portion that receives the bottom protrusion of an upper first container when the first containers are stacked in an assembled state; The base portion is a second receiving portion that receives the bottom protrusion of the upper first container when the first containers are stacked in a folded state; In an assembled state, the first container has upwardly recessed portions formed at lower ends of both side edges of the pivotable side wall portion disposed above the second receiving portion, and a space is formed between the upper end of the second receiving portion and an inner peripheral surface of the recessed portions.

3. The container set according to claim 1 or 2.

4. The bottom wall constituent portion has a chamfered portion at a lower end of a ridge portion of the first corner portion, the chamfered portion inclining downward from an outer surface toward an inner side of the first container.

3. The container set according to claim 1 or 2.

5. a first bottom wall portion having a generally rectangular shape in plan view; a bottom wall component including a pair of base portions that protrude upward from a pair of opposing side edges of the first bottom wall portion, respectively; a pair of opposing pivotal sidewall portions pivotally connected to the pair of opposing base portions, respectively; Equipped with The pair of opposing rotating side wall portions can be rotated inward to be in a folded state, and the pair of opposing rotating side wall portions can be raised from the folded state to be in an assembled state. The pair of pivoting sidewalls have upper flanges that protrude outward from upper edges, The bottom wall component is a substantially rectangular bottom plate portion that constitutes the inner bottom surface of the container; a support portion protruding downward from the lower surface of the bottom plate portion; a plurality of bottom protrusions protruding downward from the lower surfaces of first corner portions of the bottom wall component, The pivoting side wall portion is a first receiving portion recessed inward from an outer edge of the upper flange portion for receiving the bottom protrusion of the upper container when the containers are stacked in an assembled state; The base portion is a second receiving portion recessed inward from the outer edge of the base portion for receiving the bottom protrusion of the upper container when the containers are stacked in a folded state; A container characterized by:

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