JP7134482B2 - folding container - Google Patents

Description

The present invention relates to a collapsible container used for transporting articles and the like.

Conventionally, a bottom wall portion having a substantially rectangular shape in a plan view, a bottom wall forming portion including a base portion protruding upward along each side portion of the bottom wall portion, and each base portion, A side wall portion is connected so as to be rotatably displaceable between a standing position erected above each base portion and a lying position laid above the bottom wall portion, and all the side wall portions are in the standing position. Collapsible containers are known which are changeable between an assembled state with all side walls lying down and a folded state with all side walls in a laid-down position.

The side walls of the foldable container include a pair of first side walls facing each other and a pair of second side walls facing each other. The second side wall portion cannot be set to the upright position unless the second side wall portion is set to the upright position first. Further, on both side portions of the first side wall portion, protrusions protrude from the inner surface of the first side wall portion and contact the outer surface of the second side wall portion to prevent outward displacement of the second side wall portion in the assembled state of the folding container. A support protrusion is provided for the support. In addition, the support protrusion is provided with a recess (engagement portion) that opens toward the center of the first side wall in the width direction, and the outer surface of the second side wall is engaged with the foldable container in the assembled state. An engaging protrusion inserted into the joint is provided (see, for example, Patent Document 1, etc.).

JP-A-2001-287738

By the way, it is also true that there is a demand for further improvements in the transportation and storage efficiency of the collapsible container in the folded state.

SUMMARY OF THE INVENTION An object of the present invention is to provide a collapsible container that can be reduced in height when folded.

Hereinafter, each means suitable for solving the above object will be described separately. It should be noted that actions and effects specific to the corresponding means will be added as necessary.

Means 1. a bottom wall forming portion including a bottom wall portion having a substantially rectangular shape in plan view and a base portion provided along each side portion of the bottom wall portion;
With respect to each of the base portions of the bottom wall constituting portion, a standing position erected above each base portion and a lying position lying above the bottom wall portion are connected so as to be rotatably displaceable. and a side wall portion;
In a collapsible container capable of changing its state between an assembled state in which all of the side walls are in the upright position and a folded state in which all of the side walls are in the lying position,
The base portions include a pair of opposing first base portions protruding upward from a pair of opposing side portions of the bottom wall portion, and a pair of opposing base portions configured to be lower in height than the first base portions. and a second base portion of
The side wall portion includes a pair of first side wall portions respectively connected to the respective first base portions, and a pair of second side wall portions respectively connected to the respective second base portions,
In a configuration that allows the second side wall portion to be in the standing position by setting the pair of first side wall portions to the standing position when changing from the folded state to the assembled state,
Both side portions of the first side wall portion are provided with supporting protrusions protruding from the inner surface of the first side wall portion,
In the assembled state, the outer surface side of the second side wall is in contact with or close to the support protrusion of the first side wall,
The supporting protrusion is provided with an engaging portion that opens toward the center of the first side wall in the width direction,
An engaging projection that is inserted into the engaging portion of the supporting projection in the assembled state is provided on the outer surface side of the second side wall,
At least one of the engaging projections provided corresponding to each of the supporting projections is provided to project laterally of the second side wall portion beyond the side edge portion of the second side wall portion. ,
A portion of the inner surface of the first base portion is provided with a portion protruding laterally of the second side wall portion more than the side portion of the second side wall portion when the second side wall portion is in the lying position. A base recess into which the engaging projection is inserted is provided,
The recessed base has a rear surface extending parallel or substantially parallel to the inner surface of the first side wall in the upright position, and the rear surface of the recessed base extends in the inside-outside direction of the folding container in the assembled state. The surface is located at the same position as the inner surface of the first side wall in the upright position, or is positioned on the inner side of the collapsible container relative to the inner surface of the first side wall in the upright position. A collapsible container.
Means 2. The collapsible container according to means 1, wherein the engaging projection is provided so as to protrude laterally of the second side wall portion from the outermost side surface of the side portion of the second side wall portion.

According to means 1 and the like , the thickness of the engaging projection (the width in the lateral width direction of the second side wall portion) is sufficiently ensured, and the engaging portion (opening edge) and the outside of the supporting projection are separated from each other in the supporting projection. It is possible to minimize the projection length of the support projection from the inner surface of the first side wall portion while ensuring a sufficient width between the peripheral edge portion (tip edge portion). Therefore, while improving the durability of the engaging projections and the supporting projections, it is possible to prevent the supporting projections from increasing the height of the folding container when the folding container is folded. can do. As a result, the height of the folded container can be reduced as much as possible while stabilizing the assembled state of the folded container, and the transportation and storage efficiency of the folded container can be improved. be able to. In particular, in the case of a structure in which the folding container is carried by hand on the side wall portion of the folding container in the assembled state in which the articles are accommodated (when the side wall portion has a handle), the engaging protrusions, and Further, the effect of stabilizing the assembled state of the folding container by increasing the durability of the supporting protrusions is more pronounced, and the folding container containing the articles can be carried more stably.

Further , when the second side wall portion in the upright position is set to the lying position, it is possible to avoid interference between the engaging projection and the first base portion. Therefore, when the collapsible container is folded, the engaging projections may get caught on the upper surface or the inner surface of the first base portion, and the engaging projections may be damaged or the second side wall portion may be displaced to the lying position. Therefore, it is possible to prevent a situation in which the height of the folding container in the folded state becomes too high. Furthermore, by providing the recessed base portion of the first base portion, the portion of the first base portion that is relatively thin in thickness is part of the extension direction of the first base portion, thereby reducing the strength of the first base portion, etc. can be deterred.

In addition, in the assembled state of the folding container, the inner surface of the first side wall portion is substantially flush with the inner surface of the base recess provided in the first base portion, or positioned on the outer side of the folding container relative to the inner surface. is configured to Thereby, when displacing the second side wall between the upright position and the lying position, it is possible to avoid interference between the engaging projection and the first side wall. Therefore, when the foldable container is to be folded, the engaging protrusions are caught on the inner surface of the first side wall portion, resulting in reduced workability in folding and assembling the foldable container, or damage to the engaging protrusions. Such situations can be prevented.

Fig. 2 is a perspective view of the collapsible container in an assembled state as seen from the top side; Fig. 2 is a perspective view of the collapsible container in an assembled state as seen from the bottom side; Fig. 2 is a perspective view of the folding container in a folded state as seen from the top side; Fig. 2 is a perspective view of the folding container in a folded state as seen from the bottom side; FIG. 4 is a perspective view showing a folding container with one short side wall portion in the laid down position and the other short side wall portion in the upright position; FIG. 4 is a plan view showing the folding container with one short side wall portion in the laid down position and the other short side wall portion in the upright position; FIG. 4 is a side view showing the collapsible container with one short side wall portion in the laid down position and the other short side wall portion in the upright position; It is a perspective view which shows the outer surface side of a short-side side wall part. It is a perspective view which shows the outer surface side of a long-side side wall part. It is the partial expansion side view which looked at the short side side wall part from the outer surface side. FIG. 11 is a partially enlarged cross-sectional view of a connecting portion between a long-side sidewall portion and a short-side sidewall portion taken along line AA in FIG. 10; Fig. 2 is a partially enlarged perspective view including a partial cross section of the folding container in an assembled state; Fig. 2 is a cross-sectional view of the collapsible container in the folded state; Fig. 10 is a side view showing a state in which the folding containers in the folded state are stacked. FIG. 10 is a side view showing a state in which the folding container in the folded state is placed on the folding container in the assembled state. FIG. 4 is a partially enlarged cross-sectional view showing a mold for molding short side wall portions; FIG. 11 is a partially enlarged plan view showing a collapsible container in a folded state according to another embodiment;

An embodiment will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the collapsible container 1 has a bottom wall portion 3 which has a substantially rectangular shape in a plan view, and protrudes upward from the bottom wall portion 3 along each long side of the bottom wall portion 3 . and a short-side base portion 5 projecting upward from the bottom wall portion 3 along each short side portion of the bottom wall portion 3. . Further, the collapsible container 1 is rotatably connected to the long side wall portions 6 and the short side base portions 5, respectively, which are rotatably connected to the long side base portions 4, respectively. and short side wall portions 7 . The bottom wall forming portion 2, the long side wall portions 6, and the short side wall portions 7 of this embodiment are made of polypropylene. In this embodiment, the short-side base portion 5 corresponds to the first base portion, the long-side base portion 4 corresponds to the second base portion, and the short-side side wall portion 7 corresponds to the first side wall portion. The long side wall portion 6 corresponds to the second side wall portion.

Further, as shown in FIGS. 1 and 3, the long side wall portion 6 and the short side wall portion 7 stand above the long side base portion 4 and the short side base portion 5, respectively. It is configured to be rotatably displaceable between a standing position provided and a lying position lying on the central portion side of the bottom wall portion 3 . Further, the projection length of the long-side base portion 4 from the bottom wall portion 3 is shorter than the projection length of the short-side base portion 5 from the bottom wall portion 3, and the long-side side wall portion 6 is rotated. The formation position of the long-side bearing portion 8 for rotatably supporting the short-side side wall portion 7 is also located below the formation position of the short-side bearing portion 9 for rotatably supporting the short-side side wall portion 7 . Further, the width of the short side wall portion 7 is configured to be substantially the same as the length of the short side width of the bottom wall forming portion 2 , and the width of the long side side wall portion 6 is the width between the pair of short side base portions 5 . It is configured approximately the same as the distance.

For this reason, in the present embodiment, the folding container 1 in the assembled state (see FIG. 1) in which all the long side wall portions 6 and the short side wall portions 7 are in the upright position is When the side wall portion 6 and the short side wall portion 7 are laid down (see FIG. 3), the pair of long side wall portions 6 are placed first as shown in FIG. After being displaced to the lying position, the short-side side wall portion 7 is displaced to the lying position. As shown in FIG. 3, when the collapsible container 1 is in the folded state, the long-side side walls 6 in the lying position overlap above the bottom wall 3 and the short side in the lying position. The side wall portion 7 overlaps the long side wall portion 6 above.

The distance between the pair of long-side base portions 4 is longer than twice the vertical width of the long-side side wall portion 6 (long-side base plate 31, which will be described later). Therefore, the heights of the pair of long-side side wall portions 6 at the lying position are aligned. Furthermore, the distance between the pair of short-side base portions 5 is slightly longer than twice the vertical width of the short-side sidewall portion 7 (short-side base plate 11 described later). For this reason, the heights of the pair of short-side side wall portions 7 at the lying positions are aligned.

Further, as shown in FIG. 3 and the like, in the present embodiment, both ends of the short-side base portion 5 protrude above the long-side base portion 4 and are connected to the upper surface side of the long-side base portion 4 . An auxiliary projection 10 is provided. The auxiliary projections 10 are intended to improve the strength of both ends of the short-side base portion 5 . In addition, as shown in FIG. 13 and the like, the pair of long side wall portions 6 in the lying position are both supported in contact with the upper surface of the bottom wall portion 3, and the pair of short sides in the lying position are supported. The side wall portions 7 are configured to abut (or approach) the pair of long side wall portions 6 respectively laid down and supported at the same height position. Further, as shown in FIG. 3 and the like, the short-side base portion 5 and the upper side portions (upper surfaces) of the auxiliary convex portions 10 are located above the short-side side wall portions 7 in the lying position.

As shown in FIGS. 1 and 8 , each short side wall portion 7 includes a short side base plate 11 having a substantially rectangular shape in a front view and a short side base plate 11 extending along the upper side portion of the short side base plate 11 . Short-side upper frame portion 12 protruding outward from base plate 11, short-side lower side rib 13 protruding outward from the lower side of the short-side base portion, and downward from the lower surface of short-side lower side rib 13. and a short-side hinge portion 14 that protrudes outward and is pivotally supported by the short-side bearing portion 9 . The short-side upper frame portion 12 has a short-side upper rib 12a projecting outward from the upper side portion of the short-side base plate 11, and a short-side upper rib 12a at a position a predetermined distance downward from the short-side upper rib 12a. A short side upper frame lower rib 12b extending parallel to the side upper side rib 12a, and a short side upper frame connecting the lower surface of the short side upper side rib 12a and the upper surface of the short side upper frame lower rib 12b. and a reinforcing rib 12c. Incidentally, in the present embodiment, the short-side base plate 11 corresponds to a plate-like body that constitutes the first side wall portion.

In addition, as shown in FIGS. 5, 7, 8, etc., the upper portions including the upper end portions of both side portions of the short side wall portion 7 protrude inward from the inner surface of the short side base plate 11, respectively. An engagement wall 15 is provided as a support protrusion. Each engaging wall 15 is provided with an engaging hole portion 16 (engaging portion) penetrating the short-side side wall portion 7 in the lateral width direction.

Further, as shown in FIGS. 1, 10 to 12, etc., the short-side base plate 11 has short-side base plates 15 at positions adjacent to the respective engaging walls 15 and the short-side upper frame portion 12. By forming a substantially U-shaped slit in the plate 11, an elastic piece 18 formed by a portion surrounded by the slit and a locking projection 19 protruding inward from the tip of the elastic piece 18 are formed. An elastic locking piece 17 is provided. Each elastic piece 18 is connected to the short-side base plate 11 at the widthwise central portion of the short-side sidewall portion 7 , and is configured to be elastically deformable in the thickness direction of the short-side sidewall portion 7 . The inner surface of the elastic piece 18 is flush with the inner surface of the short-side base plate 11 , and the locking projection 19 protrudes inward from the inner surface of the short-side base plate 11 .

As shown in FIG. 11 and the like, the locking projection 19 has an acute-angled horizontal cross-section. The surface of the locking projection 19 on the side of the short side wall portion 7 is perpendicular to the short side base plate 11. extending in the direction Furthermore, as shown in FIG. 8 and the like, on the outer surface side of the elastic locking piece 17, locking reinforcing ribs 20 extending along the upper side and the lower side of the elastic locking piece 17 are provided. In addition, as shown in FIG. 11 and the like, the rear surface side (outer surface side) of the locking projection 19 is hollowed, and the locking reinforcement rib 20 is also connected to the rear surface side of the locking projection 19. It is In addition, the projecting length from the rear surface of the elastic piece 18 and the locking projection 19 of the locking reinforcement rib 20 of this embodiment is the intermediate position in the projecting direction of the elastic locking piece 17 from the connecting portion with the short-side base plate 11 . is shorter than the portion on the root side of the elastic locking piece 17, and the portion on the tip side of the elastic locking piece 17 is longer than the portion on the root side of the elastic locking piece 17. ing.

As shown in FIG. 8 , the short-side hinge portion 14 includes a hinge body 21 projecting downward from the lower surface of the short-side lower rib 13 and both side surfaces of the hinge body 21 in the width direction of the short-side side wall portion 7 . It has a pair of shaft projections 22 projecting sideways from the lower end. In addition, on the outer surface side of the short side wall portion 7 , the short side upper frame portion 12 and the short side lower side rib 13 are provided on the lateral width direction central portion side of the short side side wall portion 7 of each elastic locking piece 17 . A short-side vertical rib 23 is provided to connect between. Further, the short-side base plate 11 expands outward in a range surrounded by the short-side upper frame portion 12, the short-side lower rib 13, and the pair of left and right short-side vertical ribs 23. An outlet 24 is provided. The outer peripheral portion of the bulging portion 24 extends obliquely, and the space between the upper surface of the bulging portion 24 and the short-side upper frame portion 12 and between the lower surface of the bulging portion 24 and the short-side lower ribs is They are appropriately connected by ribs. In the present embodiment, the outer edges of the short-side upper frame portion 12, the short-side lower ribs 13, and the short-side vertical ribs 23, and the outer surface of the bulging portion 24 form the short-side sidewall portion 7. The outer surface is configured In addition, the inner surface of the short side wall portion 7 is formed by the inner surface of the portion of the short side base plate 11 other than the bulging portion 24 (see FIG. 5, etc.). The thickness of the short side wall portion 7 is between the outer surface and the inner surface of the short side wall portion 7 .

As shown in FIGS. 1, 9, etc., each long-side wall portion 6 includes a long-side base plate 31 having a substantially rectangular shape in a front view, and a long-side base plate 31 extending along the upper side of the long-side base plate 31. A long-side upper frame portion 32 protruding outward from the base plate 31, a long-side lower side rib 33 protruding outward from the lower side portion of the long-side base plate 31, and a long-side lower side rib 33. A long-side hinge portion 34 that protrudes downward from the lower surface and is pivotally supported by the long-side bearing portion 8 is provided. It should be noted that the long-side upper frame portion 32 also includes, like the short-side upper frame portion 12, two rows of upper and lower ribs and ribs connecting the upper and lower ribs. Furthermore, the long-side base plate 31, like the short-side base plate 11, has a bulging portion that bulges outward in a range including the central portion thereof. In addition, the long-side hinge portion 34 includes a hinge main body 35 and a shaft protrusion 36 similarly to the short-side hinge portion 14 . In this example, there is also a long-side hinge portion 34 in which the shaft projection 36 is provided only on one side of the hinge body 35 . Further, in the present embodiment, the long-side hinge portion 34 (especially the shaft projection portion 36) constitutes the shaft portion.

Engagement projections 37 protruding from the outer surface of the long side base plate 31 are provided on the upper portions of both side portions of the long side wall portion 6 . Then, after displacing the short side wall portions 7 to the standing position as shown in FIG. 5, the long side wall portions 6 are displaced to the standing position as shown in FIG. , the engaging projection 37 is inserted into the engaging hole portion 16 provided in the engaging wall 15 of the short side wall portion 7, and as shown in FIGS. The outer surface of the long-side side wall portion 6 on the periphery of the contacting wall 15 abuts on or approaches the engaging wall 15 . With this configuration, tilting displacement of the long side wall portion 6 in the upright position to the outside is prevented, and displacement in the vertical direction between the long side wall portion 6 and the short side wall portion 7 is prevented. It is designed to be prevented.

Furthermore, just before the long side wall portion 6 is brought to the upright position, the side portion of the outer surface of the long side wall portion 6 comes into contact with the locking protrusion 19 of the elastic locking piece 17 of the short side wall portion 7 . do. At this time, the elastic piece 18 of the elastic locking piece 17 is elastically deformed outward, so that the long side wall portion 6 can be displaced to the standing position as it is. When the long side wall portion 6 moves over the locking projection 19 and displaces to the upright position, the elastic locking piece 17 returns to its original position by its own elasticity, and the locking projection 19 moves toward the long side. The inner surface of the long-side base plate 31 of the side wall portion 6 is in contact with or comes close to it. This configuration prevents the long side wall portion 6 from tilting inward at the upright position.

As shown in FIG. 5, in the present embodiment, only the engaging walls 15 protrude inward from the inner surface of the short-side base plate 11 on both sides of the short-side side wall portion 7. On both sides of the inner surface of the side base plate 11 , base protrusions 38 are provided that slightly protrude inward from the entire vertical width direction, and the engaging walls 15 protrude from the base protrusions 38 . In the width direction of the short side wall portion 7 , the width of the base protrusion 38 is wider than the width of the engagement wall 15 , and in this embodiment, has the same length as the thickness of the long side base portion 4 .

On the other hand, as shown in FIG. 9 , the engaging protrusions 37 of the long side wall portions 6 project slightly laterally beyond the side portions of the long side base plate 31 . Incidentally, the engaging projections 37 of this embodiment are located below the main engaging projections 37 and the engaging projections 37, and are located on the sides of the long side wall portions 6 and the lower surface. However, there are sub-engagement projections 37 connected to ribs provided on the outer surface of the long-side side wall portion 6 , but they protrude laterally beyond the side portions of the long-side base plate 31 . 1 is related to the main engaging projection 37 (hereinafter also referred to as "main projection 37A").

As shown in FIG. 5, the inner surface of the short-side base portion 5 protrudes slightly laterally from the side portion of the long-side base plate 31 when the long-side side wall portion 6 is laid down. A base recess 5A into which the engaging projection 37 (main projection 37A) is inserted is provided. That is, the distance between the pair of short-side base portions 5 is substantially the same as the width of the long-side base plate 31 (see FIG. 6, etc.), and the main projection 37A is positioned on the long-side base plate 31 side. If it protrudes laterally of the long-side base plate 31 more than the side portion, the main projection 37A may interfere with the short-side base portion 5 when the long-side side wall portion 6 is laid down. be done. In this regard, by providing the base recessed portion 5A, interference between the main projection 37A and the short-side base portion 5 is avoided, and the long-side sidewall portion 6 including the main projection 37A is separated from the pair of short-side base portions 5A. It is designed to be inserted between In addition, the base recesses 5A are formed only on the inner surface of the short-side base portion 5 at portions corresponding to the main protrusions 37A when the pair of long-side side wall portions 6 are laid down. Therefore, basically, the inner surface of the short-side base portion 5 and the side surface of the long-side side wall portion 6 (the side portion of the long-side base plate 31) in the lying position are in contact with each other, or , are placed in close proximity.

Further, as shown in FIG. 1 and the like, the base concave portion 5A is located outside the inner surface of the short-side base portion 5 and is parallel to or substantially parallel to the inner surface of the short-side side wall portion 7 in the upright position. It has a rear surface 5B extending in parallel. In this embodiment, the lower edge of the recessed base portion 5A is located slightly above the upper surface of the bottom wall portion 3 (bottom plate portion 41). It may be positioned at the same height as (bottom plate portion 41). Furthermore, in the present embodiment, the side edge and lower edge of the inner surface 5B and the inner surface of the short-side base portion 5 extend inwardly of the folding container 1 from the peripheral edge of the inner surface 5B. Although they are connected by an inclined surface inclined in the outer peripheral direction of the inner surface 5</b>B, they may be connected by a surface substantially orthogonal to the inner surface of the short-side base portion 5 . In addition, the shape of the portion of the main projection 37A on the inner surface side of the long side wall portion 6 is such that it does not interfere with the base recess portion 5A when the foldable container 1 is folded.

Further, as shown in FIG. 5 , regarding the range around the engagement wall 15 in which the base convex portion 38 projecting inwardly from the inner surface of the short-side base plate 11 of the short-side side wall portion 7 is provided, the length At a portion corresponding to the main protrusion 37A that protrudes laterally from the side portion of the side base plate 31, the base protrusion 38 is omitted so that the main protrusion 37A can be inserted into the engagement hole 16. It has become. More specifically, in the inside-outside direction of the collapsible container 1 in the assembled state, the inner surface 5B of the recessed base 5A is aligned with the inner surface of the short side wall portion 7 (the inner surface of the short side base plate 11) in the upright position. They are located at substantially the same position (or the same position, or a design in which the inner surface 5B is slightly inward of the folding container 1 with respect to the inner surface of the short side wall portion 7). Further, as described above, the base projection 38 is provided in the peripheral portion of the engaging wall 15, but when the long-side sidewall 6 is displaced between the open position and the closed position, the main projection 37A is displaced. A portion of the base projection 38 is omitted on the orbit of the main projection 37A through which the base projection 38A passes so as not to form a hindrance to the main projection 37A. is formed so that the recessed portion 38A is flush with the inner surface of the short side wall portion 7 (short side base plate 11) or positioned slightly outward from the inner surface of the short side wall portion 7. look good).

As described above, the strength of both side portions of the short-side side wall portion 7 is improved by the base convex portion 38, and the main protrusion 37A projects laterally beyond the side portions of the long-side base plate 31. As a result, the lateral width of the engaging projection 37 can be increased as much as possible without increasing the projection length of the engaging wall 15, and the reduction in the strength of the peripheral portion of the engaging hole portion 16 can be suppressed. Further, a base recessed portion 5A is provided on the inner surface side of the short-side base portion 5, and the inner surface of the short-side side wall portion 7 (at least when the long-side side wall portion 6 is displaced between the open position and the closed position). (corresponding to the track of the main projection 37A) is substantially flush with the inner surface 5B of the base recess 5A, so that the main projection 37A protrudes more laterally than the side portion of the long-side base plate 31. In this configuration, the long-side side wall portion 6 can be relatively smoothly rotated and displaced. In addition, in the inside and outside directions of the collapsible container 1 in the assembled state, the inner surface 5B of the base recess 5A is configured to be located inward of the collapsible container 1 with respect to the inner surface of the short side wall portion 7 in the upright position. is also possible.

As shown in FIGS. 1, 4, and 13, the bottom wall portion 3 of the bottom wall forming portion 2 includes a bottom plate portion 41 having a substantially rectangular plate shape, and the bottom plate portion 41 includes the collapsible containers 1 in the assembled state. When the collapsible container 1 is vertically stacked (stacked), the outer periphery corresponding portion 42 (the upper surface side of the bottom wall portion 3) is supported in contact with the upper side portions of the side walls 6 and 7 of the lower collapsible container 1. support portion 43 projecting downward from a portion on the inner peripheral side of the portion where the long-side base portion 4 and the short-side base portion 5 are provided). With this configuration, when the collapsible containers 1 in the assembled state are stacked, the support portions 43 of the upper collapsible container 1 are inserted into the inner peripheral sides of the side walls 6 and 7 of the lower collapsible container 1. , the outer periphery corresponding portion 42 of the upper foldable container 1 is supported in contact with the upper side portions of the side walls 6 and 7 of the lower foldable container 1 . In addition, as shown in FIG. 13 and the like, the bottom plate portion 41 of the present embodiment is configured such that the outer periphery corresponding portion 42 is positioned above the portion on the inner periphery side thereof. In addition, in the present embodiment, the molds for forming the inner spaces of the long-side base portion 4 and the short-side base portion 5 are punched downward via the outer periphery corresponding portion 42, so that The portion 42 basically remains only like a rib (see FIG. 4 and the like).

Furthermore, as shown in FIG. 14, when the folding containers 1 in the folded state are stacked, the support portions 43 of the upper folding container 1 are placed on the pair of short-side base portions 5 of the lower folding container 1. and inserted into the space (see FIG. 3) between the auxiliary convex portions 10 provided corresponding to both ends of each short side base portion 5, and the outer periphery corresponding portion of the upper folding container 1 42 are in contact with and supported by the upper side portion of the short-side base portion 5 of the lower foldable container 1 . In particular, in this embodiment, when the folding containers 1 in the folded state are stacked, the lower surface of the support portion 43 of the upper folding container 1 and the short side of the lower folding container 1, which is the lying position, are arranged. The outer surface of the side wall portion 7 facing upward is configured to approach (or contact).

As shown in FIGS. 5 and 6, the long-side bearing portion 8 is opened upward and to the inner peripheral side of the bottom wall portion 3, and is an insert into which the hinge main body 35 of the long-side hinge portion 34 can be inserted. 44 and the shaft projection 36 of the long-side hinge portion 34 can be inserted therein, restricting the displacement of the shaft projection 36 toward the inner peripheral side of the bottom wall portion 3 and rotating the shaft projection 36. and a shaft support portion 45 that allows displacement. Further, the shaft support portion 45 is provided with a retaining protrusion 46 that prevents the shaft protrusion 36 inserted into the shaft support portion 45 from coming off from the shaft support portion 45 . In this embodiment, four long-side bearing portions 8 are provided in each long-side base portion 4 .

The short-side bearing portion 9 also includes an insertion portion 44 , a shaft support portion 45 , and a retainer projection 46 in the same manner as the long-side bearing portion 8 . In this embodiment, four short-side bearing portions 9 are provided in each short-side base portion 5 .

Now, as shown in FIGS. 4, 5, etc., in the bottom wall-constituting portion 2, when the short-side side wall portion 7 is laid down corresponding to the long-side base portion 4, the short-side side wall A housing portion 51 is provided into which the engagement wall 15 of the portion 7 can be inserted. The accommodating portion 51 of the present embodiment is provided so as to open to the outer peripheral side of the bottom wall-constituting portion 2 and vertically penetrate the bottom wall-constituting portion 2 . The thickness of the engagement wall 15 is configured to be smaller than the thickness of the long-side base portion 4, and when the engagement wall 15 is accommodated in the accommodation portion 51, the outer surface of the engagement wall 15 and the long-side base portion 4 is substantially flush with the outer surface.

Further, as shown in FIG. 5, of the upper surface of the long-side base portion 4, the portion on which the short-side side wall portion 7 (base convex portion 38) placed in the lying position is placed is is also a stepped portion 52 positioned slightly downward. In the present embodiment, the short-side side wall portion 7 is laid down, so that the inner surface side (base convex portion 38) of the short-side side wall portion 7 becomes the upper surface (stepped portion 52) of the long-side base portion 4. , and the projection direction tip of the engaging wall 15 inserted into the housing portion 51 (the side portion facing downward when the short side wall portion 7 is in the lying position) , flush with the bottom surface of the bottom plate portion 41 (periphery corresponding portion 42) of the bottom wall portion 3, or slightly above the bottom surface (see FIGS. 4 and 14). Therefore, as shown in FIG. 15, when the folding container 1 in the folded state is placed on the upper side of the folding container 1 in the assembled state, the side walls 7 on the short sides are engaged with the folding container 1 on the upper side. Although the joint wall 15 and the upper sides of the side walls 6 and 7 of the lower collapsible container 1 abut or approach each other, the engagement wall 15 of the upper collapsible container 1 does not contact the lower collapsible container 1. The side wall portions 6 and 7 press upward, and the short side wall portion 7 of the upper folding container 1 is displaced upward relative to the bottom wall forming portion 2 of the upper folding container 1 and the like. is avoided.

In addition, as shown in FIG. 13, in this embodiment, the outer surface (upward facing surface) and the inner surface (downward facing surface) of the short side wall portion 7 in the lying position are , extending substantially horizontally. In addition, the outer surface and the inner surface of the long side wall portion 6 at the lying position also extend in the substantially horizontal direction, and the inner surface of the short side wall portion 7 at the lying position extends along the length of the long side wall portion 7 at the lying position. It is arranged to be close to the outer surface of the side wall portion 6 . In addition, it is also possible to configure such that the inner surface of the short side wall portion 7 in the lying position contacts the outer surface of the long side wall portion 6 in the lying position. However, even if the protruding end of the engaging wall 15 of the short-side side wall portion 7 in the lying position is positioned above the lower surface of the outer periphery corresponding portion 42, the distance from the lower surface of the outer periphery corresponding portion 42 is too large. , and less than the wall thickness of each portion of the bottom wall-constituting portion 2 (accommodating portion 51, etc.).

Further, as shown in FIG. 5 and the like, in the engaging wall 15, the peripheral edge portion of the engaging hole portion 16 is configured to be thicker than the other portions. Furthermore, as shown in FIG. 11, in the present embodiment, the thickness (W1) of the peripheral portion of the engaging hole portion 16 of the engaging wall 15 is equal to that of the short side base plate 11 forming the short side wall portion 7. It is configured to be larger than the thickness (W2) of . In addition, as shown in FIGS. 5 and 6, in the long-side base portion 4, between each accommodating portion 51 and both ends of the long-side base portion 4 (short-side base portion 5), A long-side bearing portion 8 is provided. In this embodiment, the long-side bearing portion 8 and the accommodating portion 51 are arranged close to each other, and the distance between the accommodating portion 51 and the long-side bearing portion 8 is larger than the width of the accommodating portion 51. It is short and shorter than the lateral width of the long-side bearing portion 8 .

Further, as shown in FIGS. 8 and 10 to 12, the short-side side walls 7 of the present embodiment are arranged outside the folding container 1 of the elastic locking pieces 17, and are arranged outside the folding container 1. A stopper portion 53 abuts on the elastic locking piece 17 which has been deformed by a certain amount, and restricts further deformation. More specifically, the short-side sidewall portion 7 has outer edges of the short-side upper frame portion 12 and short-side lower ribs 13 on both sides of the outer surface side of the short-side sidewall portion 7 . A corner wall portion 54 is provided to connect with the outer edge. It protrudes toward the central portion in the lateral width direction. As shown in FIG. 11 , the stopper portion 53 is thicker than the corner wall portion 54 and protrudes inward (toward the elastic locking piece 17 ) of the folding container 1 beyond the corner wall portion 54 . ing.

When the collapsible container 1 in the assembled state is to be folded, the elastic locking pieces 17 are pushed outward from the inside of the collapsible container 1 . By elastically deforming the elastic pieces 18 to a position where the locking projections 19 are no longer in contact with the long side wall portions 6, the inward tilting displacement of the long side wall portions 6 by the elastic locking pieces 17 is restricted. The locked state is released, and the side walls 6 on the long side can be displaced toward the lying position. Further, when the elastic locking piece 17 is elastically deformed outward, if the elastic piece 18 is deformed by a certain amount, the stopper portion 53 comes into contact with the outer surface of the elastic locking piece 17 on the distal end side. It's like Of course, when the stopper portion 53 and the elastic locking piece 17 are in contact with each other, the locking state of the elastic locking piece 17 is released, and the deformation of the elastic piece 18 does not exceed the elastic limit. It fits.

In addition, as shown in FIGS. 10 and 11, the elastic piece 18 extends parallel to the short side base plate 11, and the stopper portion 53 also extends parallel to the short side base plate 11. Therefore, in the thickness direction of the short-side side wall portion 7, the stopper portion 53 overlaps with the portion including the center portion in the vertical width direction of the distal end portion of the elastic locking piece 17. As shown in FIG. As a result, the elastically deformed outer surface of the elastic locking piece 17 on the distal end side and the stopper portion 53 are configured to come into contact with each other. Further, as shown in FIG. 10, the vertical width of the stopper portion 53 is shorter than the vertical width of the elastic locking piece 17, and when the elastic locking piece 17 is elastically deformed outward by a certain amount, the stopper portion 53 is , of the outer surface of the elastic piece 18, so as to abut against a portion between the pair of upper and lower locking reinforcing ribs 20 provided on the outer surface side of the elastic locking piece 17 (do not contact the locking reinforcing rib 20). It's becoming

8, 11, 12, etc., the short side wall portion 7 is provided with a space between the elastic locking piece 17 and the stopper portion 53 on the side of the short side wall portion 7. As shown in FIGS. An opening 55 is provided to open to the. In the present embodiment, corner reinforcing ribs 56 connecting the corner wall portion 54 and the short-side base plate 11 are provided at substantially the same height positions as the upper side portion and the lower side portion of the elastic locking piece 17 . The opening 55 is partitioned by the pair of upper and lower corner reinforcing ribs 56, the corner wall portion 54, and the short side base plate 11, and the space between the elastic locking piece 17 and the stopper portion 53 is defined. It communicates with Further, the opening 55 extends (horizontally) along the lateral width direction of the short side wall portion 7, like the engaging hole 16 provided in the engaging wall 15. As shown in FIG.

In addition, as shown in FIG. 16, the portions where the elastic locking piece 17 and the stopper portion 53 face each other (the outer surface on the tip side of the elastic locking piece 17 and the inner surface of the stopper portion 53) are In a mold device 58 for molding the short side wall portion 7 , molding is performed by a mold 59 for molding the outer surface side of the engagement wall 15 , the engagement hole portion 16 passing through the engagement wall 15 , and the like.

As described in detail above, according to the present embodiment, the upper engaging projection 37 (main projection 37A) of the pair of upper and lower engaging projections 37 provided corresponding to each engaging wall 15 is long. It is provided so as to protrude to the side of the long side wall portion 6 from the side portion of the side side wall portion 6 (long side base plate 31). For this reason, the thickness of the main projection 37A (the width in the lateral width direction of the long-side side wall portion 6) is sufficiently ensured, and the engagement wall 15 has the engagement hole portion 16 (opening edge) While sufficiently securing the width between the outer peripheral edge (tip edge) of be able to. Therefore, while improving the durability of the main projection 37A and the engaging wall 15, the engaging wall 15 increases the height of the folding container 1 when the folding container 1 is folded. Such situations can be suppressed. As a result, the height of the folded container 1 can be minimized while stabilizing the assembled state of the folding container 1, and the transportation and storage efficiency of the folding container 1 in the folded state is improved. etc. can be achieved. In particular, when the folding container 1 is placed in an assembled state in which articles are accommodated, the folding container 1 can be folded by holding the side walls 6 and 7 (by gripping the short-side upper frame portion 12 or the long-side upper frame portion 32). In the case of a configuration for carrying the item, the effect of stabilizing the assembled state of the folding container 1 by increasing the durability of the engaging projection 37 and the engaging wall 15 is more remarkably achieved. The accommodated folding container 1 can be carried more stably.

Further, part of the inner surface of the short-side base portion 5 is provided with a base recess portion 5A into which the main projection 37A is inserted when the long-side side wall portion 6 is laid down. Therefore, when the long side wall portion 6 in the upright position is set to the lying position, interference between the main projection 37A and the short side base portion 5 can be avoided. Therefore, when the collapsible container 1 is folded, the main protrusions 37A may be caught on the upper surface or the inner surface of the short-side base portion 5, causing damage to the main protrusions 37A, etc. Therefore, it is possible to prevent a situation in which the height of the folded container 1 in the folded state is increased. Furthermore, by providing the base recessed portion 5A of the short-side base portion 5 with a relatively thin thickness, a part of the short-side base portion 5 extends in the extending direction. A decrease in the strength of the portion 5 can be suppressed.

In addition, the recessed base 5A has an inner surface 5B extending parallel or substantially parallel to the inner surface of the short side wall 7 in the upright position. The inner surface 5B of 5A is positioned substantially at the same position as the inner surface of the short side wall portion 7 in the upright position. That is, when the folding container 1 is assembled, the inner surface of the short side wall portion 7 is substantially flush with the inner surface 5B of the base recess portion 5A provided in the short side base portion 5 . Thereby, interference between the main projection 37A and the short side wall portion 7 can be avoided when the long side wall portion 6 is displaced between the upright position and the lying position. Therefore, when folding the collapsible container 1, the main projections 37A are caught on the inner surface of the short-side side wall portion 7, resulting in reduced workability in folding and assembling the collapsible container 1, and the main projections 37A, etc. It is possible to prevent situations such as damage.

Further, in the bottom wall-constituting portion 2, a housing portion 51 into which the engagement wall 15 of the short-side side wall portion 7 in the laid-down position can be inserted is provided corresponding to the long-side base portion 4. 2 is vertically penetrated. Therefore, in the bottom wall forming portion 2, there is no portion that contacts and supports the downward facing surface of the engaging wall 15 of the short-side side wall portion 7 in the lying position. Therefore, it is possible to prevent the height position of the short-side side wall portion 7 in the lying position from being determined by supporting the engaging wall 15 . That is, for example, compared to a configuration in which the housing portion 51 is provided with a bottom portion, the engagement wall 15 of the short side wall portion 7 in the lying position can be positioned downward, and the short side wall portion 7 in the lying position can be positioned downward. The whole can be positioned as low as possible. Therefore, the height position of the upward facing surface (outer surface) of the short-side side wall portion 7 in the lying position can be kept low, so that the height of the folding container 1 in the folded state can be reduced. In particular, when stacking the foldable containers 1 in the folded state, the height of the stacked multiple foldable containers 1 can be minimized. As a result, it is possible to increase the number of foldable containers 1 that can be stacked in a limited space during transportation and storage, thereby improving transportation and storage efficiency.

Further, the thickness of the peripheral portion of the engaging hole portion 16 in the engaging wall 15 is configured to be larger than the thickness of the short-side base plate 11 . Therefore, the strength and rigidity of the engaging wall 15 can be increased, and in particular, deformation of the peripheral portion of the engaging hole portion 16 can be prevented. Therefore, by providing the accommodation portion 51 as described above, the engagement wall 15 of the short-side side wall portion 7 is exposed to the lower surface side of the folding container 1 in the folded state (in the long-side base portion 4, Even in a configuration such that there is no portion to protect the downward facing surface of the engaging wall 15 of the short-side side wall portion 7 in the lying position, it is possible to suppress damage, deformation, etc. of the engaging wall 15. can. In addition, the portion of the short-side base plate 11 that is connected to the engagement wall 15 is also thickened by providing the base convex portion 38 (see FIG. 11). Tilt displacement and the like of the wall 15 can be prevented. The thickness of the peripheral portion of the engaging hole portion 16 of the engaging wall 15 is thicker than the thickness of the short-side base plate 11 at the portion where the base convex portion 38 is provided.

Furthermore, as described above, since the housing portion 51 is not provided with a bottom portion, the projection length of the engagement wall 15 from the short-side side wall portion 7 can be ensured as long as possible. It is possible to secure the lateral width of the engaging protrusion 37 as large as possible while suppressing a decrease in the strength of the engaging wall 15 on which the protrusion 16 is provided. Therefore, it is possible to prevent the engaging protrusion 37 and the engaging wall 15 from being damaged or deformed, thereby improving the durability.

In addition, in each long-side base portion 4, the long-side bearing portions 8 provided between each accommodation portion 51 and both end portions of the long-side base portion 4 and each accommodation portion 51 are close to each other. is provided. For this reason, the strength and rigidity of the peripheral portion, which is reduced due to the provision of the housing portion 51, is compensated for by the long-side bearing portion 8 and the long-side hinge portion 34 connected to the long-side bearing portion 8. be able to.

Further, the downward facing surface of the engaging wall 15 of the short-side side wall portion 7 in the lying position is at the same height as the lower end of the housing portion 51 or higher than the lower end of the housing portion 51 . It is configured to be at a slightly higher height position (a position separated upward by a distance less than the thickness of the wall portion that constitutes the housing portion 51). For this reason, the engaging wall 15 of the short-side side wall portion 7 in the laying position protrudes downward from the housing portion 51, so that the engaging wall 15 easily comes into contact with another member, or is in an assembled state. When the folding container 1 in the folded state is placed on the folding container 1, the upper side portion of the long side wall portion 6 of the lower folding container 1 abuts against the engaging wall 15 of the upper folding container 1. A situation in which the engaging wall 15 is lifted can be avoided. Therefore, damage to the engaging wall 15 can be suppressed. Further, even when this configuration (the lower surface of the engaging wall 15 of the short-side side wall portion 7 in the lying position and the lower end portion of the housing portion 51 are at the same height) is adopted, for example, the housing portion 51 The engaging wall 15 of the short-side side wall portion 7, which is laid down, can be positioned downward by the thickness of the bottom portion, compared to the structure in which the bottom portion is provided at the bottom. Therefore, it is possible to ensure that the short side wall portion 7 in the lying position is positioned as low as possible and that the projection length of the engaging wall 15 from the short side wall portion 7 is secured as much as possible.

In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other applications and modifications not exemplified below are naturally possible.

(a) In the above-described embodiment, the side portions of the long side wall portion 6 (long side base plate 31) are formed in a substantially linear shape. may be formed. Further, the main projection 37A is provided corresponding to a portion of the side portion of the long-side base plate 31 that is closest to the long-side side wall portion 6, so that the projection length of the engaging wall 15 is increased. is as short as possible.

In addition, the engagement hole portion 16 into which the engagement projection 37 is inserted and engaged does not penetrate the engagement wall 15 (for example, the engagement hole portion 16 has a lateral width direction side wall portion 7 of the short side wall portion 7). (concave shape) in which the side portion is closed and the widthwise central portion of the short-side side wall portion 7 is opened (concave shape), but by penetrating the short-side side wall portion 7, the portion to be engaged by inserting the engaging projection 37 can be changed. , the outer surface of the engaging wall 15, etc., can be molded by the mold 59, and complication of the mold structure can be suppressed.

Also, the arrangement of the elastic locking piece 17 in the vertical direction is not particularly limited, but it is desirable to provide it as high as possible in view of stabilization of the locked state and operability when releasing the locked state. In addition, although the locking projection 19 of the elastic locking piece 17 is hollowed out, it may be constructed so as not to have such a recess. Further, the arrangement of the engagement wall 15 in the vertical direction is not particularly limited, but it is desirable to provide it as high as possible in order to stabilize the assembled state of the folding container 1 and the like. In addition, in the above-described embodiment, the engaging walls 15 are configured to have partially different thicknesses, but may be configured to have the same thickness.

Further, in the above-described embodiment, the stopper portion 53 is configured to be able to abut against the distal end portion side of the elastic locking piece 17, but instead of or in addition to this configuration, for example, the elastic locking piece 17 It may be constructed so as to be able to abut on the root portion side (or the intermediate portion in the projecting direction). Furthermore, in the above-described embodiment, the elastic piece 18 of the elastic locking piece 17 is configured such that the end portion of the short-side side wall portion 7 on the side of the widthwise central portion is connected to the short-side base plate 11 . , the upper end portion or the lower end portion of the elastic piece 18 may be connected to the short-side base plate 11 . In addition, in the above-described embodiment, the inner surface of the long-side side wall portion 6 may be provided with a recess for accommodating the locking projection 19 of the elastic locking piece 17 .

In addition, in the above-described embodiment, the elastic locking piece 17 is configured to prevent the long-side side wall portion 6 from tilting inward in the upright position. For example, it is constructed as a separate member from the long side wall portion 6, and when the collapsible container 1 is in the assembled state, an engagement state in which it engages with the short side wall portion 7 and a release state in which the engagement state is released. A configuration in which a locking mechanism capable of changing between states is provided on the outer surface side of the long side wall portion 6 (which is set to the standing position after the short side wall portion 7 is set to the standing position when assembling the folding container 1). can also be adopted.

(b) In the above-described embodiment, the projecting direction tip of the engaging wall 15 of the short side wall portion 7 in the laid position (when the short side wall portion 7 is in the laid position, it faces downward). side portion) is flush with the bottom surface of the bottom plate portion 41 (periphery corresponding portion 42) of the bottom wall portion 3, or is positioned slightly above the bottom surface. It suffices that the end portion of the engaging wall 15 of the side wall portion 7 in the projecting direction is not located below the lower surface of the support portion 43 of the bottom wall forming portion 2 . However, in order to prevent another member from coming into contact with the engaging wall 15 protruding downward from the housing portion 51, the engaging wall 15 of the short-side side wall portion 7 placed in the laid-down position is configured as a bottom wall. It is desirable to be flush with the lower surface of the outer periphery corresponding portion 42, which is the lower surface of the portion of the portion 2 where the accommodating portion 51 is provided, or to be positioned slightly above the lower surface.

(c) In the above embodiment, the short-side base portion 5 protrudes upward from the long-side base portion 4, and when the collapsible container 1 is changed from the folded state to the assembled state, the pair of short-side side wall portions 7 is set to the upright position first, and then the long side wall portion 6 is set to the upright position. When assembling, the pair of long side wall portions may be set to the standing position first, and then the short side wall portions may be set to the standing position. When adopting this configuration, engaging walls and elastic locking pieces are provided on the side wall portions on the long sides, and accommodation portions are provided corresponding to the base portions on the short sides.

In the above-described embodiment, the pair of long-side side wall portions 6 in the lying position are both in contact with the upper surface of the bottom wall portion 3, and are configured to have the same height position. The other long side wall portion 6 is laid down on top of one of the long side wall portions 6 laid down, and the long side wall portions 6 overlap each other vertically. It may be configured as

In addition, in the above embodiment, the number, arrangement, width, etc. of the long-side hinge portions 34 (long-side bearing portions 8) and the short-side hinge portions 14 (short-side bearing portions 9) are It is not particularly limited, and can be changed as appropriate. However, it is desirable that the long-side bearing portion 8 is provided at least near one side of the accommodating portion 51 in order to increase the strength of the periphery of the accommodating portion 51 provided in the long-side base portion 4 . Further, for example, as shown in FIG. 17 , the long-side bearing portions 8 may be provided in the vicinity of both sides of the accommodating portion 51 in the extending direction of the long-side base portion 4 .

(d) Although the collapsible container 1 in the above embodiment is made of polypropylene, it may be made of other resin materials such as polyethylene, PET, and polyamide.

DESCRIPTION OF SYMBOLS 1... Folding container 2... Bottom wall structure part 3... Bottom wall part 4... Long side base part 5... Short side base part 5A... Base recessed part 5B... Back surface 6... Long side side wall Portions 7 Short side wall portion 8 Long side bearing portion 9 Short side bearing portion 15 Engagement wall 16 Engagement hole 17 Elastic locking piece 37 Engagement Projection 37A Main projection 51 Accommodating portion 53 Stopper 55 Opening 59 Mold.

Claims (2)

a bottom wall forming portion including a bottom wall portion having a substantially rectangular shape in plan view and a base portion provided along each side portion of the bottom wall portion;
With respect to each of the base portions of the bottom wall constituting portion, a standing position erected above each base portion and a lying position lying above the bottom wall portion are connected so as to be rotatably displaceable. and a side wall portion;
In a collapsible container capable of changing its state between an assembled state in which all of the side walls are in the upright position and a folded state in which all of the side walls are in the lying position,
The base portions include a pair of opposing first base portions protruding upward from a pair of opposing side portions of the bottom wall portion, and a pair of opposing base portions configured to be lower in height than the first base portions. and a second base portion of
The side wall portion includes a pair of first side wall portions respectively connected to the respective first base portions, and a pair of second side wall portions respectively connected to the respective second base portions,
In a configuration that allows the second side wall portion to be in the standing position by setting the pair of first side wall portions to the standing position when changing from the folded state to the assembled state,
Both side portions of the first side wall portion are provided with supporting protrusions protruding from the inner surface of the first side wall portion,
In the assembled state, the outer surface side of the second side wall is in contact with or close to the support protrusion of the first side wall,
The supporting protrusion is provided with an engaging portion that opens toward the center of the first side wall in the width direction,
An engaging projection that is inserted into the engaging portion of the supporting projection in the assembled state is provided on the outer surface side of the second side wall,
At least one of the engaging projections provided corresponding to each of the supporting projections is provided to project laterally of the second side wall portion beyond the side edge portion of the second side wall portion.cage,
In a part of the inner surface of the first base portion, when the second side wall portion is in the laid down position, said A base recess into which the engaging projection is inserted is provided,
The recessed base has a rear surface extending parallel or substantially parallel to the inner surface of the first side wall in the upright position, and the rear surface of the recessed base extends in the inside-outside direction of the folding container in the assembled state. The surface is located at the same position as the inner surface of the first side wall in the upright position or on the inner side of the collapsible container relative to the inner surface of the first side wall in the upright position. A collapsible container characterized by: 2. The collapsible container according to claim 1, wherein said engaging projection is provided so as to protrude laterally of said second side wall portion from the outermost side surface of said side portion of said second side wall portion.

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