JP2015034028A - Foldable container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable container that can suppress deflection and deformation and can improve durability.SOLUTION: A foldable container 10 with a square box shape comprises a square plate-like bottom wall 11, and a pair of facing first side walls (short side walls) 12 and a pair of facing second side walls (long side walls) 13 which are erected in the edges of the bottom wall 11, and is configured to be foldable inward by putting the pair of first side walls 12 upon the bottom wall 11 and putting the pair of second side walls 13 upon the pair of first side walls 12. At each of the pair of the first side walls 12, a first contact portion (upper flat surface 30c) that comes in contact with the bottom wall 11 when folding the container, is provided, and at each of the pair of second side walls 13, a second contact portion (inner surface 60a of an upper frame 60) that comes in contact with the first side wall 12 when folding container, is provided. The second contact portions are positioned above the first contact portions when folding the container.

Description

  The present invention relates to a rectangular box-like folding container.

  In recent years, containers made of synthetic resin have been used from the viewpoint of ease of handling and the like. Patent Document 1 discloses a folding container including a square plate-like bottom plate, a pair of long side plates, and a pair of short side plates. Each side plate is configured to be foldable inward at the position of a hinge portion extending along the periphery of the bottom plate. Then, corner pieces are attached to the upper left and right side edges of the pair of long side plates and short side plates as engaging members for engaging the side plates.

JP 2000-118529 A

  These engaging members are in a state of protruding from the surface of the plate material when the plate material constituting the side plate is viewed in cross section. Therefore, when each side plate is folded inward, the engaging member attached to each side plate comes into contact with the adjacent plate member, and in the portion where the engagement member is not provided, the engagement member is interposed between the adjacent plate members. A gap based on the wall thickness will occur.

  For example, in the folding container described in Patent Document 1, the pair of long side plates is first folded on the bottom plate, and the pair of short side plates is folded on the pair of long side plates. In the state where the long side plate is folded, the corner pieces for the long side plate attached to the left and right sides contact the bottom plate, and the corner for the long side plate is located between the bottom plate and the corner portion for the long side plate. There is a gap corresponding to the wall thickness of the piece. In addition, the short side plate folded on the long side plate, the short side plate corner piece attached to the left and right sides of the short side plate abuts the long side plate, and in the portion where the short side plate corner piece is not attached, In this state, a gap corresponding to the wall thickness of the corner piece for the short side plate is generated.

  In a state where such a gap is formed, when a load is applied to the short side plate located on the upper side, the short side plate is in the direction of the long side plate in the portion where the gap is formed between the lower long side plate and the lower side plate. It becomes easy to bend. In addition, the load applied to the short side plate located on the upper side is transmitted to the long side plate through the corner piece on the short side plate, but between the long side plate and the bottom plate. In the portion where the gap is formed, the long side plate is easily bent toward the bottom plate. As a result, each side plate is likely to be deformed, and there is a problem that it is difficult to stand each side plate when assembling the container, and the durability of the container is lowered.

  This invention is made | formed in view of such the conventional situation, The objective is to suppress bending and a deformation | transformation of a folding container, and to improve durability.

  In order to achieve the above object, a folding container according to claim 1 comprises a square plate-like bottom wall and a pair of first and second side walls opposed to each other and erected on the periphery of the bottom wall. A rectangular box-like container, wherein the pair of first side walls are overlaid on the bottom wall, and the pair of second side walls are overlaid on the pair of first side walls so that the container can be folded inward. Each of the pair of first side walls is provided with a first abutting portion that contacts the bottom wall when folded, and each of the pair of second side walls contacts the first side wall when folded. A second abutting portion that comes into contact is provided, and the second abutting portion is located above the first abutting portion when folded.

  When a load is applied to the second side wall located on the upper side during folding, the load is transmitted to the first side wall via the second contact part and also to the bottom wall via the first contact part. According to the above configuration, the first contact portion and the second contact portion are positioned so as to overlap in the vertical direction when folded. No gap is formed between the wall and the first side wall and between the first side wall and the second side wall. Therefore, when a load is applied from above, the shape of the first side wall and the second side wall is maintained without being bent in this portion. Thereby, bending and deformation of the first side wall and the second side wall can be suppressed.

  Moreover, since each contact part is provided in each of a pair of each side wall, the location where it contact | abuts without a clearance gap in the up-down direction is formed in multiple places. Thereby, the load from upper direction can be disperse | distributed and it leads to the further suppression of the bending of each side wall, and a deformation | transformation.

  In the folding container, the first side wall includes a first side wall portion made of a hollow plate material and a first engagement member attached to the first side wall portion, and the second side wall has a second side made of a hollow plate material. A side wall portion, and a second engagement member that is attached to the second side wall portion and engages with the first engagement member in an assembled state to fix the first side wall and the second side wall, Preferably, the first engagement member is provided with the first contact portion, and the second engagement member is provided with the second contact portion.

  When each side wall is formed of a hollow plate material, when a load is applied from above with the container folded, the hollow portion of the hollow plate material is crushed and the hollow plate material is easily deformed. In this regard, when the first contact portion and the second contact portion are positioned so as to overlap in the vertical direction, the hollow portion of the hollow plate member can be prevented from being crushed.

  In the folding container, the first engagement member is provided with the first contact portion extending in the width direction of the first side wall, and the second engagement member has a width direction of the second side wall. It is preferable that the second abutting portion extending in a cross section is provided, and the first abutting portion and the second abutting portion intersect in a cross-beam shape when viewed from above when folded.

  Since the first contact portion and the second contact portion intersect in a cross-beam shape when viewed from above, it is possible to receive a load from above evenly and distribute the applied load evenly at a plurality of locations. be able to.

  According to the folding container of the present invention, it is possible to suppress the bending and deformation of the member and improve the durability.

The perspective view of the folding container of the state which made the 2nd side wall (long side wall) stand upright. The perspective view of the folding container of an assembly state. The perspective view of a main-body part. (A) is sectional drawing of the notch part periphery of a 1st side wall (short side wall). (B) is sectional drawing of the notch part periphery of a 2nd side wall (long side wall). (A), (b) is a perspective view of the 2nd engagement member (long side engagement member). (A), (b) is a perspective view of a 1st engaging member (short side engaging member). (A), (b) is a perspective view of a 2nd engagement member (upper edge frame). (A), (b) is a perspective view of a fitting member. The front view at the time of folding of a folding container. AA sectional drawing of FIG.

Hereinafter, the folding container of this invention is demonstrated based on drawing.
As shown in FIG. 2, a bottomed box-like folding container 10 (hereinafter simply referred to as a container 10) that opens upward includes a long square plate-like bottom wall 11 and a short side of the bottom wall 11 that faces each other. A pair of short side walls 12 (first side walls) erected along the edges and a pair of long side walls 13 (second side walls) erected along the opposing long side edges of the bottom wall 11 are provided. Yes. As shown in FIG. 1, the container 10 is configured to be foldable by folding a pair of short side walls 12 on the bottom wall 11 and then folding the pair of long side walls 13 on the short side wall 12. Has been.

  As shown in FIG. 3, the container 10 includes a main body portion 10 a made of a synthetic resin hollow plate material having a hollow structure. The main body portion 10a includes a bottom wall portion 11a constituting the bottom wall 11, a short side wall portion 12a (first side wall portion) standing along the short side edge of the bottom wall portion 11a and constituting the short side wall 12, A long side wall portion 13 a (second side wall portion) that is provided along the long side edge of the bottom wall portion 11 a and constitutes the long side wall 13 is provided. More specifically, a cross-shaped hollow plate material in which a portion serving as the short side wall portion 12a and a portion serving as the long side wall portion 13a are integrated with the four side edges of the long square portion serving as the bottom wall portion 11a, and the bottom wall portion 11a The bottom wall portion 11a, the short side wall portion 12a, and the long side wall portion 13a are respectively formed by bending in a box shape along the four side edges of the portion. Moreover, as shown in FIG. 4, the said hollow board | plate material is comprised from the core layer 21 which forms a hollow structure inside, and the skin layers 22 and 23 joined to both surfaces of the core layer 21. As shown in FIG.

  As shown in FIG.1 and FIG.2, the container 10 is comprised by attaching various members with respect to the main-body part 10a. Specifically, the short side engagement member 30 (first engagement member) is attached to the upper portion of the short side wall portion 12a of the main body portion 10a, and the container 10 is formed by the short side wall portion 12a and the short side engagement member 30. A short side wall 12 is formed. Moreover, the long side member 40 (2nd engagement member) is attached to the both sides and upper part of the long side wall part 13a of the main-body part 10a, and the long side wall 13 of the container 10 is attached by the long side wall part 13a and the long side member 40. It is configured. The long side member 40 includes a pair of long side engaging members 50 attached to both end portions of the long side wall portion 13a, and an upper edge frame 60 attached to the upper portion of the long side wall portion 13a. Further, the fitting member 70 is attached to the corner of the bottom wall portion 11a of the main body 10a, and the bottom wall 11 of the container 10 is configured by the bottom wall portion 11a and the fitting member 70. Each of these members 30.50.70.70 is a member made of synthetic resin that is molded by injection molding, extrusion molding, or the like, separately from the main body portion 10a.

Next, the short side wall 12 will be described.
As shown in FIG. 3, the short side wall portion 12 a constituting the short side wall 12 is formed in a horizontally long rectangular shape, and the insertion protrusion 121 for attaching the short side engaging member 30 to both upper side portions thereof. Are provided.

  As shown in FIG. 6, the short side engaging member (first engaging member) 30 constituting the short side wall 12 is a plate-like member having a substantially square shape when viewed from the front. As shown in FIG. 6B, insertion concave portions 31 for inserting the insertion protrusions 121 of the short side wall portion 12 a are provided on both side portions of the lower end surface of the short side engagement member 30.

  As shown in FIG. 6A, the short side engaging member 30 extends in the vertical direction along the side edge of the short side engaging member 30 on both sides of the outer surface 30 b located outside when the container 10 is assembled. Engaging recesses 32 are respectively provided. In the engagement recess 32, three engagement protrusions 33 protruding in the thickness direction of the short side engagement member 30 are arranged in parallel in the vertical direction.

  In addition, an accommodation recess 34 extending in the left-right direction is provided on the upper portion of the outer surface 30 b of the short side engagement member 30. On the outer surface 30 b of the short side engagement member 30, the housing recess 34 and the engagement recess 32 are partitioned and formed with the side edge rib 35 interposed therebetween. An insertion hole 35 a penetrating the side edge rib 35 is formed in a portion of the side edge rib 35 positioned above the engaging protrusion 33.

  A lock bar 36 is housed in the housing recess 34. The lock bar 36 is a square plate-like member that is arranged to be slidable in the up-down direction within the housing recess 34. Engagement protrusions 36 a that are inserted into the insertion holes 35 a of the side edge ribs 35 and protrude into the engagement recesses 32 are provided on both end surfaces of the lock bar 36. In addition, a pair of urging plates 36 b that urge the lock bar 36 upward are integrally formed on the lower end surface of the lock bar 36 in the housing recess 34.

  At the upper edge of the short side engagement member 30, the upper edge rib 38 constituting the upper edge of the housing recess 34 is at the same height across the width direction of the short side engagement member 30. It is provided. In addition, a lower edge rib 39 that extends downward from the lower end portion of the engagement recess 32 and extends in the width direction along the lower edge of the short side engagement member 30 extends in the width direction at the lower portion of the short side engagement member 30. Are provided at the same height. On the outer surface 30 b of the short side engagement member 30, the side edge rib 35 is formed higher than the upper edge rib 38. The other portions are formed so as to be equal to or lower than the height of the upper edge rib 38.

  As shown in FIG. 6, the side edge ribs 35 are formed to be connected to the inclined surfaces rising and inclined from both ends of the upper edge rib 38, and are connected to the inclined surfaces rising and inclined from both ends of the lower edge rib 39. Is formed. The side edge ribs 35 are formed as L-shaped protrusions having the same height in the portion from the upper end of the short side engagement member 30 to the lower end of the engagement recess 32. The side edge ribs 35 are formed as ridges having the same height in the portion from the upper end of the short side engagement member 30 to the lower end of the engagement recess 32. As a result, the side edge rib 35 is the projecting portion having the highest height on the outer surface 30b of the short side engagement member 30, and the wall thickness at the side edge rib 35 is the largest in the entire short side wall 12. It is thick.

As shown in FIG. 6, a gripping hole 37 for inserting a hand when gripping the container 10 is formed through the upper portion of the lower edge rib 39 in the central portion of the short side engagement member 30.
As shown in FIG. 6B, the upper portion of the inner surface 30 a of the short side engaging member 30 above the gripping hole 37 is formed as an upper flat surface 30 c that has no irregularities across the width direction of the short side engaging member 30. . Moreover, the inner surface 30a of the short side engaging member 30 is formed so that the part which protrudes from the upper plane 30c does not exist over the whole. That is, portions other than the upper plane 30c are formed to be the same height or lower than the upper plane 30c.

  As shown in FIGS. 1 and 4A, a cut portion 12b extending in the width direction along the lower side of the short side wall portion 12a is provided at the lower portion of the short side wall portion 12a in the short side wall 12. The cut portion 12b is formed at an upper position by a predetermined height from the inner skin layer 23 constituting the bottom wall portion 11a. The cut portion 12b is formed from the outer surface side of the short side wall portion 12a, and the skin layer 22 and the core layer located on the outer surface side of the short side wall portion 12a while leaving the skin layer 23 positioned on the inner surface side of the short side wall portion 12a. This is a half cut made by cutting 21. The short side wall 12 can be folded inward by bending the inner skin layer 23 portion remaining in the cut portion 12b and opening the cut portion 12b. That is, the inner skin layer 23 portion remaining in the cut portion 12b functions as a hinge.

Next, the long side wall 13 will be described.
As shown in FIG. 3, the long side wall portion 13a constituting the long side wall 13 is formed in a horizontally long rectangular shape. As shown in FIG. 1, a long side member (second engagement member) 40 constituting the long side wall 13 includes a pair of long side engagement members 50 attached to the left and right side edges of the long side wall portion 13a, and a long side wall. It is comprised from the upper edge flame | frame 60 attached to the upper edge of the part 13a. A cutout 131 for attaching the upper edge frame 60 is provided in the upper central portion of the horizontally long rectangular shape of the long side wall portion 13a.

  As shown in FIG. 5, the long-side engagement member 50 is a plate-like member having an L-shaped cross section that extends in the vertical direction as a whole, and includes a fixed wall portion 51 fixed to the long side wall portion 13a, and a fixed wall portion. And an engaging wall portion 52 that protrudes inwardly (from the side of the short side wall 12) from the side edge of 51.

  An insertion recess 53 for inserting a side edge of the long side wall portion 13 a is provided on the inner end surface of the fixed wall portion 51. On the lower end surface of the fixed wall portion 51, a pair of rotating shaft portions 54 are provided at a predetermined interval. A shaft body 54 a that protrudes to the side is formed on both sides of the rotating shaft portion 54.

  The engagement wall portion 52 is a portion that engages with the short side engagement member 30 constituting the short side wall 12 in the assembled state, and extends in the vertical direction along the outer edge of the inner surface 51 a of the fixed wall portion 51. It is molded into. The engagement wall portion 52 is provided with three engagement holes 55 penetrating vertically through the engagement wall portion 52, and an engagement groove 56 that is recessed upward is recessed in the side end surface of the engagement wall portion 52. It is installed. Further, an opening 56 a that opens inward from the engagement wall 52 is formed in the lower portion of the engagement groove 56.

  As shown in FIGS. 1 and 7, the upper edge frame 60 is a bar-shaped member having a U-shaped cross section having an insertion recess 61 on the lower surface side, and a notch 131 of the long side wall portion 13 a is formed in the insertion recess 61. It is fixed to the long side wall part 13a as a state where the upper edge including it is inserted. As shown in FIG. 7B, the inner surface 60a of the upper edge frame 60 is formed as a flat surface having no uneven shape.

  The long side member 40 is attached so as to be flush with the inner surface. That is, the inner surface 51a of the fixed wall portion 51 of the long side engaging member 50 and the inner surface 60a of the upper edge frame 60 are formed to be flush with each other when attached to the long side wall portion 13a.

  As shown in FIG.1 and FIG.4 (b), the notch part 13b extended in the width direction is provided in the lower part of the long side wall part 13a in the long side wall 13 along the lower side of the long side wall part 13a. The long side wall portion 13a can be folded inward by bending the inner skin layer 23 portion remaining in the cut portion 13b and opening the cut portion 13b. Further, the cut portion 13 b of the long side wall 13 is formed at a position higher than the cut portion 12 b of the short side wall 12. As a result, as shown in FIG. 4B, when the long side wall 13 is folded, a space S <b> 1 that can accommodate the short side wall 12 is secured between the bottom wall 11 and the long side wall 13.

Next, the bottom wall 11 will be described.
As shown in FIG. 3, the bottom wall portion 11 a constituting the bottom wall 11 is formed in a horizontally long rectangular shape. As shown in FIG. 8, the fitting member 70 constituting the bottom wall 11 includes a substantially triangular plate-like lower wall portion 70a and a vertical wall portion 70b erected from the side edge of the lower wall portion 70a on the short side wall 12 side. And a lateral wall portion 70c erected from the side edge of the lower wall portion 70a on the long side wall 13 side. An attachment recess 71 for attaching a corner portion of the bottom wall portion 11a is provided on the lower surface side inside the lower wall portion 70a.

  The upper end surface of the horizontal wall portion 70c is formed in a horizontal plane, and serves as a mounting surface on which the lower surface of the long side engaging member 50 is mounted. A pair of bearing portions 72 are recessed in a substantially square hole shape at a predetermined interval on the upper end surface of the horizontal wall portion 70c. The bearing portion 72 is a portion on which the rotation shaft portion 54 of the long side engaging member 50 is pivotally supported, and forms a hinge together with the rotation shaft portion 54.

  As shown in FIG. 8 (b), the inner end of the side end surface of the bearing 72 has an inclined surface that inclines downward from the inside to the outside, and a substantially triangular prism-like engagement with the lower surface side formed flat. A stop projection 73 is provided to project. The rotating shaft portion 54 is inserted into the bearing portion 72 from above, and the shaft body 54a is accommodated in the space S2 between the lower surface of the locking projection 73 and the bottom surface of the bearing portion 72 in the bearing portion 72. By doing so, it is pivotally supported with respect to the bearing portion 72.

Next, the folding method of the container 10 of this embodiment is described.
As shown in FIG. 2, the container 10 in the assembled state has the long side wall 13 in the standing state by placing the long side engaging member 50 on the lateral wall portion 70 c of the fitting member 70 of the bottom wall 11. In addition, the short side wall 12 is erected along the vertical wall portion 70 b of the fitting member 70. At this time, the shaft body 54 a of the rotation shaft portion 54 of the long-side engagement member 50 is pivotally supported by the bearing portion 72 of the fitting member 70. Further, the engagement protrusion 36 a of the lock bar 36 accommodated in the short side engagement member 30 is engaged with the engagement groove 56 of the engagement wall portion 52 of the long side engagement member 50, and the short side engagement. The engagement protrusion 33 of the combined member 30 is engaged with the engagement hole 55 of the long-side engagement member 50, whereby the short side wall 12 and the long side wall 13 are connected to each other, and the inward Rotation to is prevented.

  As shown in FIGS. 2 and 6, in order to fold the container 10 in the assembled state, first, the lock bar 36 of the short-side engagement member 30 is operated to slide downward so that the lock bar 36 The engagement state between the engagement protrusion 36a and the engagement groove 56 of the engagement wall 52 is released. At the same time that the engagement state between the engagement protrusion 36a and the engagement groove 56 is released, the connection state between the short side wall 12 and the long side wall 13 is released.

  The short side wall 12 released from the connected state is turned 90 degrees downward about the inner skin layer 23 portion remaining in the cut portion 12b as a rotation axis and folded on the bottom wall 11. After the pair of opposing short side walls 12 are both folded on the bottom wall 11, the long side wall 13 is folded on the short side wall 12. At this time, in the central portion of the long side wall 13, the long side wall 13 rotates with the inner skin layer 23 portion remaining in the cut portion 13 b as a rotation axis. The long side engagement member 50 rotates with respect to the fitting member 70 with the center of the shaft body 54a in the rotation shaft portion 54 of the combined member 50 as a rotation axis. When the long side wall 13 is folded downward, the engaging wall portion 52 protruding from the inner surface 51a of the fixed wall portion 51 of the long side engaging member 50 is housed on both sides of the bottom wall 11 and fixed. The inner surface 51 a of the wall portion 51 abuts on the outer surface 30 b of the short side engagement member 30.

  As shown in FIGS. 1 and 9, with the short side wall 12 and the long side wall 13 folded, a part of the long side engaging member 50 overlaps above the short side engaging member 30, and the upper edge The frame 60 is in a folded state with the overlapped state. The pair of short side walls 12 are folded on the bottom wall 11 with their upper edges spaced apart, and the pair of long side walls 13 are folded on the short side walls 12 with their upper edges spaced apart.

Next, the operation of the container 10 of this embodiment will be described.
As shown in FIG. 9, the container 10 is in the folded state when not in use, such as during storage. At this time, the side walls 12 and 13 are folded with their upper edges spaced apart. Therefore, the upper edge of each side wall 12 and 13 cross | intersects in a cross-beam shape mutually.

  The short side engaging member 30 is attached to the short side wall portion 12a, and the upper flat surface 30c extending in the width direction has the most protruding shape on the inner surface 30a. Accordingly, the short side wall 12 comes into contact with the inner surface side of the bottom wall 11 at the upper flat surface 30 c of the short side engaging member 30. The upper flat surface 30c of the short side engaging member 30 acts as a first contact portion that contacts the bottom wall when folded.

  The long side engagement member 50 and the upper edge frame 60 of the long side member 40 are attached to the long side wall portion 13 a, and the inner surface 51 a of the fixed wall portion 51 of the long side engagement member 50 and the inner surface 60 a of the upper edge frame 60. Is the same. Further, the inner surface 51a of the fixed wall portion 51 of the long side engaging member 50 is formed as a flat surface having no uneven shape, and the inner surface 60a of the upper edge frame 60 is formed as a flat surface having no uneven shape. Furthermore, the engaging wall portion 52 formed to protrude from the inner surface 51 a of the fixed wall portion 51 of the long side engaging member 50 can be accommodated outside the both end edges of the bottom wall 11 when the container 10 is folded. Therefore, when the long side wall 13 is folded inward, the inner surface 60 a of the upper edge frame 60 among the members constituting the long side wall 13 can come into contact with the outer surface 30 b of the short side engaging member 30.

  Here, the upper edge rib 38 is provided in the upper edge of the outer surface 30b of the short side engaging member 30 along the width direction. Of the outer surface 30 b of the short side engagement member 30, the inner surface 60 a of the upper edge frame 60 of the long side wall 13 abuts on the central portion of the outer surface 30 b of the short side engagement member 30. In this portion, the upper edge rib 38 protrudes most. Therefore, the inner surface 60 a of the upper edge frame 60 of the long side member 40 comes into contact with the upper edge rib 38 of the outer surface 30 b of the short side engagement member 30. Thereby, the inner surface 60a of the upper edge frame 60 of the long side member 40 acts as a second contact portion that contacts the first side wall when folded. More specifically, the inner surface 60a of the upper edge frame 60 acts as a second contact portion by contacting the upper edge rib 38 of the short side engaging member 30 of the short side wall 12 as the first side wall.

  As shown in FIG. 10, the upper flat surface 30 c of the inner surface 30 a of the short side engagement member 30 of the short side wall 12 is in the first contact at the crossing point P where the short side wall 12 and the upper edge of the long side wall 13 intersect. The inner surface 60a of the upper edge frame 60 of the long side wall 13 contacts the upper edge rib 38 of the outer surface 30b of the short side engaging member 30 as the second contact portion. become. That is, at the four cross-shaped intersections P, the upper flat surface 30c as the first contact portion contacts the bottom wall 11, and the inner surface 60a of the upper edge frame 60 as the second contact portion contacts the short side wall 12. By contacting, there is no gap between the bottom wall 11, the short side wall 12, and the long side wall 13.

  Moreover, as shown in FIG. 1, the side edge rib 35 formed by projecting from the upper edge rib 38 of the outer surface 30b of the short side engaging member 30 is in contact with the inner surface of the long side wall portion 13a. Since the side edge rib 35 is formed in the side part of the short side engaging member 30, it will contact | abut to the notch part 13b vicinity of the long side wall part 13a.

Next, the effect of the container 10 of this embodiment will be described.
(1) After the short side wall 12 is folded inward, the upper edge of the short side engagement member 30 of the short side wall 12 and the upper edge frame 60 of the long side wall 13 that intersect when the long side wall 13 is folded inward. At the intersection point P, the bottom wall 11, the short side wall 12, and the long side wall 13 are in contact with each other without a gap.

  According to the said structure, even if a load is applied from the upper direction of the container 10 folded, the bending of a side wall in the some intersection P is suppressed. Thereby, since a deformation | transformation of each side wall can be suppressed, it can suppress causing a trouble at the time of an assembly or folding of a container.

  (2) There are a plurality of first contact portions and second contact portions as the intersection P between the short side wall 12 and the long side wall 13. Therefore, it is possible to disperse the load at a plurality of intersection points P, and to suppress an excessive load from being applied to one abutting portion.

  (3) The upper edge of the short side engaging member 30 of the short side wall 12 and the upper edge frame 60 of the long side wall 13 overlap in a cross-beam shape, and each intersection point P is in a point-symmetrical position in the folded container 10. Exists. Therefore, the load applied to the container 10 can be evenly distributed, and the bending and deformation of each side wall can be more suitably suppressed.

  (4) Since the side edge rib 35 formed on the short side engaging member 30 contacts the vicinity of the cut portion 13b on the inner surface of the long side wall portion 13a, the bending of the long side wall 13 in the vicinity of the cut portion 13b, Deformation can be suppressed.

  In addition, this embodiment can also be changed and embodied as follows. Moreover, it is also possible to change the said embodiment so that it may combine the following modification example mutually and it is the combination structure.

  -In this embodiment, while using the upper plane 30c located in the upper part of the short side engaging member 30 attached along the upper edge of the short side wall part 12a as a 1st contact part, the upper edge of the long side wall part 13a The upper edge frame 60 attached along the long side member 40 is used as the second contact portion. However, the first contact portion and the second contact portion may not be provided on the upper edge of each member. The first contact portion may be provided at the center portion or the lower portion of the short side engagement member 30 so as to overlap the second contact portion of the upper edge frame, or the second contact portion may be engaged with the long side engagement. You may make it overlap with the 1st contact part provided in the member 50, and provided in the lower part of the short side engaging member 30. FIG. When the container 10 is folded, the formation position is not particularly limited as long as the second contact portion is positioned above the first contact portion.

  -You may provide a 1st contact part and a 2nd contact part not only in the cross-shaped intersection P of the side walls 12 and 13 but in another site | part. If there are a plurality of portions where no gap is formed between the bottom wall 11, the short side wall 12, and the long side wall 13 other than the four cross-shaped intersections P on the upper edge of each side wall, the bending of each side wall is more suitably suppressed. can do.

  -In this embodiment, although the bottom wall 11, the short side wall 12, and the long side wall 13 were comprised with the hollow plate material made from a synthetic resin, it is not limited to this. It is also possible to mold by injection molding or blow molding.

-The length of each side wall is not particularly limited. For example, the long side wall 13 may be the first side wall and the short side wall 12 may be the second side wall.
-The hollow board material which comprises the main-body part 10a is not limited to what is comprised from the core layer 21 and the skin layers 22 and 23. FIG. For example, it may be a hollow plate material made of an extruded product having a harmonica cross section.

-The engagement structure of the short side engagement member 30 and the long side engagement member 50 is not specifically limited, What is necessary is just a structure where adjacent side walls are connected when assembled in a box shape.
Next, a technical idea that can be grasped from the above embodiment and another example will be described.

(A) The folding container, wherein the first contact part is provided on an upper edge of the first side wall, and the second contact part is provided on an upper edge of the second side wall.
(B) A plurality of the first contact portions are provided in addition to the upper edge of the first side wall portion, and a plurality of the second contact portions are provided in addition to the upper edge of the second side wall portion, The plurality of second contact portions are respectively located above the first contact portions.

  (C) The side portion of the first side wall is provided with an abutting portion that abuts in the vicinity of the notch portion on the inner surface of the second side wall and supports the second side wall when folded. A featured folding container.

  DESCRIPTION OF SYMBOLS 10 ... Container, 11 ... Bottom wall, 12 ... Short side wall (1st side wall), 12a ... Short side wall part (1st side wall part), 13 ... Long side wall (2nd side wall), 13a ... Long side wall part (2nd side wall) Part), 12b, 13b ... notch part, 30 ... short side engagement member (first engagement member), 30c ... top plane (first contact part), 40 ... long side member (second engagement member) , 50 ... long side engagement member, 60 ... upper edge frame, 60a ... inner surface (second contact portion)

Claims (3)

A rectangular box-like container comprising a square plate-like bottom wall and a pair of opposed first and second side walls standing on the periphery of the bottom wall, wherein the pair of first side walls are disposed on the bottom wall. In the folding container that can be folded inward by overlapping one side wall and overlapping the pair of second side walls on the pair of first side walls,
Each of the pair of first side walls is provided with a first abutting portion that abuts against the bottom wall when folded, and each of the pair of second side walls is a first abutting against the first side wall when folded. 2 contact portions are provided,
The folding container, wherein the second contact portion is positioned above the first contact portion when folded. The first side wall includes a first side wall portion made of a hollow plate material and a first engagement member attached to the first side wall portion,
The second side wall is attached to the second side wall part made of a hollow plate material, and is engaged with the first engagement member in an assembled state to connect the first side wall and the second side wall. A second engaging member to be fixed,
2. The folding container according to claim 1, wherein the first engagement member is provided with the first contact portion, and the second engagement member is provided with the second contact portion. The first engagement member is provided with the first contact portion extending in the width direction of the first side wall, and the second engagement member is provided with the second extension extending in the width direction of the second side wall. A contact portion is provided,
The folding container according to claim 2, wherein the first contact portion and the second contact portion intersect in a cross-beam shape when viewed from above when folded.