JP6193047B2 - Folding container - Google Patents

Description

  The present invention relates to a folding container configured to be folded and stored and transported when not in use.

  The folding container disclosed in Patent Document 1 is configured by combining molded products molded by injection molding or the like, and each of the opposed square plates and the opposed walls standing on the periphery of the bottom wall. A pair of side walls. And it is comprised so that each side wall can be folded on a bottom wall by rotating each side wall inward in the hinge site | part provided in the lower end of each side wall.

  In addition, as disclosed in Patent Document 2, in recent years, a container made of a synthetic resin hollow plate material is also used from the viewpoint of weight reduction and the like. The container of patent document 2 is provided with the bottom wall comprised from the said hollow plate material, and each side wall. And each side wall is comprised so that it can be folded on a bottom wall by rotating each side wall inward by the thin hinge part provided in each side wall by the thermal bending or cutting (half cut). In addition, a reinforcing member formed by injection molding or the like is attached to the container of Patent Document 2 in order to reinforce the bottom wall and the edge of each side wall.

JP 2009-120227 A JP 2000-118529 A

  By the way, the conventional folding container may be provided with a restriction configuration for restricting the lateral displacement of the folding container when a plurality of folding containers are stacked one above the other. For example, a recess formed by cutting out the entire periphery of the bottom wall is provided. And when stacking a folding container, it is set as the structure which can fit the upper edge part of each side wall of a lower folding container with respect to the said recessed part of an upper folding container. As a result, the side end surface of the bottom wall of the upper folding container and the inner surface of each side wall of the lower folding container are in contact with each other, and the displacement in the left-right direction between the folding containers is restricted.

  However, the restriction configuration has a problem that the upper folding container easily falls into the lower folding container. In other words, when the weight of the upper folding container is heavy, or when the stacking position of the upper folding container is slightly shifted, there is a force that pushes the side wall outward from the upper folding container to the lower folding container. Works. As a result, the opening of the lower folding container is pushed open, and the upper folding container falls into the lower folding container.

Further, it is preferable that the folding container can regulate the positional deviation in the left-right direction even when stacked in the folded state.
The present invention has been made in view of these conventional situations, and an object thereof is to provide a folding container that can be stably stacked in an assembled state and a folded state.

In order to achieve the above object, the folding container according to claim 1 includes a square plate-like bottom wall, a pair of first side walls made of a hollow plate material that are erected and opposed to a peripheral edge of the bottom wall, and In a folding container comprising a second side wall and configured to fold the first side wall and the second side wall on the bottom wall, an engagement protrusion is formed on an upper end surface side portion of the first side wall and the second side wall. And a protruding wall portion that is provided along the periphery of the bottom wall and protrudes upward from the first and second side walls in a folded state. A groove-shaped inner recess that is engageable with the engaging protrusion when stacking containers in an assembled state, and a peripheral edge side of the inner recess. When stacking folded containers The engageable with outer recess is provided et is the projecting wall portion, said outer recess is concave in shape which is opened downward, when stacking the folded state the container, the upper end of the protruding wall portion is the It is in contact with the lower surface of the outer recess.

  When the folded containers in the assembled state are stacked, the engaging protrusions provided on the first side wall and the second side wall of the lower folding container engage with the inner recesses provided on the bottom wall of the upper folding container. Thereby, the positional deviation of the horizontal direction between the upper and lower folding containers is controlled. Then, when a pressing force is applied to the upper part of each side wall of the lower folding container, the engaging protrusions are brought into contact with the outer wall of the groove-shaped inner recess provided in the upper folding container. By contacting, the deformation of the side wall in the direction of expanding the opening is restricted. As a result, the upper folding container is prevented from falling into the lower folding container. Further, when an inward pressing force is applied to the upper part of each side wall of the lower folding container, the engaging protrusions are brought into contact with the inner wall of the groove-shaped inner recess provided in the upper folding container. By contact, the deformation of the side wall in the direction of narrowing the opening is restricted.

  When the folded containers in the folded state are stacked, the protruding wall portion provided on the bottom wall 11 of the lower folding container engages with the outer concave portion provided on the bottom wall of the upper folding container. Thereby, the positional deviation of the horizontal direction between the upper and lower folding containers is controlled.

  The said folding container WHEREIN: It is preferable that the said outer side recessed part is a recessed part of the shape open | released to the outer side and the downward direction. In this case, unlike the case where the outer concave portion is formed in a groove shape that opens downward, it is not necessary to provide a wall portion on the outer peripheral side of the outer concave portion, and the outer peripheral shape of the lower portion of the folding container becomes large. Can be avoided.

  In the folding container, the first side wall includes a first side wall portion formed of a hollow plate made of synthetic resin having a hollow structure, and first engaging members attached to both side portions of the first side wall portion. The second side wall is attached to a second side wall portion formed by the hollow plate member and both side portions of the second side wall portion, and is engaged with the first engagement member in the assembled state, and It is preferable that a second engagement member for fixing the side wall and the second side wall is provided, and the engagement protrusion is provided on an upper end surface of the first engagement member and the second engagement member. . In this case, the folding container can be reduced in weight.

  According to the folding container of the present invention, it is possible to stably stack in the assembled state and the folded state.

The perspective view of the folding container which made one 2nd side wall (long side wall) stand. The perspective view of a folding container. The perspective view of a main-body part. (A), (b) is a perspective view of a 1st engagement member (short side engagement member). (A) is sectional drawing around the notch part of the 1st side wall (short side wall), (b) is sectional drawing around the notch part of the 2nd side wall (long side wall). (A), (b) is a perspective view of the 2nd engagement member (long side engagement member). (A) is a perspective view of a fitting member, (b) is a sectional view taken along line 7b-7b, and (c) is a bottom view of the fitting member. (A) is a fragmentary sectional view which shows the state which piled up the folding container of an assembly state, (b) is a fragmentary sectional view which shows the state which piled up the folding container of a folded state. (A), (b) Explanatory drawing which shows the outer side recessed part and inner side recessed part of a modification.

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. As shown in FIG. 5, the hollow plate material includes a core layer 21 that forms a hollow structure therein, and skin layers 22 and 23 that are bonded to both surfaces of the core layer 21.

  As shown in FIG.1 and FIG.2, the container 10 is comprised by attaching the various members shape | molded separately by injection molding, extrusion molding, etc. 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.

  Further, a long side engagement member 50 (second engagement member) is attached to both side portions of the long side wall portion 13a of the main body portion 10a, and an upper edge frame 60 is attached to an upper portion of the long side wall portion 13a. The short side wall portion 12a, the long side engaging member 50, and the upper edge frame 60 constitute the long side wall 13 of the container 10. 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.

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. 4, the short side 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. 4B, 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. 4A, engagement concave portions 32 extending in the vertical direction are provided on both side portions on the outer surface side of the short side engagement member 30. In the engagement recess 32, three 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 outer surface side of the short side engagement member 30. On the outer surface side of the short-side engagement member 30, the housing recess 34 and the engagement recess 32 are partitioned and formed with a partition wall 35 interposed therebetween. An insertion hole 35 a penetrating the partition wall 35 is formed in a portion of the partition wall 35 positioned above the protrusion 33.

  A lock bar 36 is housed in the housing recess 34 of the short side engagement member 30. 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. Engaging portions 36 a that are inserted into the insertion holes 35 a of the partition wall 35 and project into the engaging recesses 32 are provided on both side 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. In addition, a gripping hole 37 for inserting a finger when gripping the container 10 is formed through the central portion of the short side engagement member 30.

  As shown in FIG. 4B, first engaging protrusions 38 are provided on both side portions of the upper end surface of the short side engaging member 30. The first engagement protrusion 38 is a protrusion that extends in the width direction (left-right direction) of the short side wall 12 from both end edges on the upper end surface of the short side engagement member 30, and the inner edge of the short side engagement member 30. It is formed along the part.

  As shown in FIG. 3 and FIG. 5A, 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 constituting the short side wall 12. . 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 portion 12a (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. ing. 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. 6, 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 on the inner surface side of the fixed wall portion 51. Is formed. The engaging wall portion 52 has three engaging holes 55 penetrating vertically through the engaging wall portion 52, and an engaging groove 56 is recessed in the side end surface of the engaging wall portion 52. Yes. An opening 56 a that opens to the inside of the engagement wall portion 52 is formed at the lower portion of the engagement groove 56.

  Further, a second engagement protrusion 57 is provided on the upper end surface of the fixed wall portion 51. The second engaging protrusion 57 is a protrusion that extends in the width direction (left-right direction) of the long side wall 13, and is formed along the inner edge of the fixed wall 51.

  As shown in FIGS. 1 and 2, the upper edge frame 60 is a bar-shaped member having a U-shaped cross section having a groove on the lower surface side thereof, and the upper edge of the long side wall portion 13a is inserted into the groove. It is being fixed to the long side wall part 13a.

  As shown in FIG. 3 and FIG. 5B, a cut portion 13 b extending in the width direction along the lower side of the long side wall 13 is provided at the lower portion of the long side wall portion 13 a constituting the long side wall 13. The long side wall 13 can be folded inward by bending the inner skin layer 23 portion remaining in the cut portion 13b to open 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. Specifically, the cut portion 13 b of the long side wall 13 is formed at a position higher than the thickness of the short side wall 12 from the upper surface of the bottom wall 11. Thereby, 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. 7, 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 a 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 of 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. 7B, the inner end of the side end surface of the bearing portion 72 has an inclined surface that is inclined downward from the inside toward the outside, and a substantially triangular prism-like engagement having a flat bottom surface. 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.

  In addition, protruding wall portions 74 are provided on the upper end surfaces of the vertical wall portion 70b and the horizontal wall portion 70c of the fitting member 70. The protruding wall portion 74 is formed in an L shape in a top view along the outer edge portion of the upper end surface of the vertical wall portion 70b and the horizontal wall portion 70c.

  As shown in FIGS. 7B and 7C, the lower surface of the lower wall portion 70a of the fitting member 70 is formed along the side edge on the vertical wall portion 70b side and the side edge on the side wall portion 70c side. An outer concave portion 75 and an inner concave portion 76 that are L-shaped when viewed from below are provided. The outer recess 75 is formed so as to include a side edge on the vertical wall 70b side and a side edge on the side wall 70c side of the lower wall 70a, and is a recess having a shape opened to the outside (each side edge side) and below. It is. As shown in FIG. 7B, the outer recess 75 is formed such that the width H <b> 1 is wider than the width of the protruding wall portion 74.

  The inner recess 76 is a groove-shaped recess that opens downward, and is formed at an inner position of the outer recess 75. Further, the inner recess 76 has a width H2 that is greater than the widths of the first engagement protrusion 38 provided on the short side engagement member 30 and the second engagement protrusion 57 provided on the long side engagement member 50. It is formed to be wide.

Next, a method for assembling the container 10 of this embodiment will be described.
When the container 10 is not in use, such as during storage, the side walls are folded. Specifically, the short side wall 12 is folded inward on the bottom wall 11, and the long side wall 13 is folded on the short side wall 12. Is folded inward. And the container 10 is made into the state assembled in the box shape by the operator as needed.

  As shown in FIG. 1, when assembling the container 10 in a folded state into a box shape, first, the long side wall 13 is rotated 90 degrees upward. At this time, in the central part of the long side wall 13, the long side wall part 13a rotates with the inner skin layer 23 portion remaining in the cut portion 13b as a rotation axis. Further, at both side portions of the long side wall 13, the long side engagement member 50 rotates with respect to the fitting member 70 with the center of the shaft body 54 a in the rotation shaft portion 54 of the long side engagement member 50 as the rotation axis. Move.

  Then, in a state where the long side wall 13 is erected by being rotated 90 degrees upward, the long side engaging member 50 is placed on the lateral wall portion 70 c of the fitting member 70, whereby the long side wall 13. The standing state is maintained. Moreover, the protruding wall part 74 provided in the horizontal wall part 70c of the fitting member 70 is arrange | positioned at the outer surface side of the long side wall 13, and supports the long side wall 13 from the outer surface side.

  After both the long side walls 13 are erected, the short side wall 12 is rotated 90 degrees upward with the inner skin layer 23 portion remaining in the cut portion 12b of the short side wall 12 as a rotation axis. At this time, the protrusion 33 of the short side engagement member 30 constituting the adjacent short side wall 12 is located inside the engagement hole 55 of the engagement wall portion 52 of the long side engagement member 50 constituting the long side wall 13. Is inserted from.

  At the same time, by operating the lock bar 36 of the short side engagement member 30 to slide downward, the engagement portion 36 a of the lock bar 36 is opened in the engagement groove 56 of the engagement wall portion 52. It is inserted through 56a. When the lock bar 36 is returned upward by the urging force of the urging plate 36 b, the engaging portion 36 a of the lock bar 36 moves upward in the engaging groove 56. Thereby, the short side wall 12 is in a locked state in which the inward rotation is restricted, and the long side wall 13 and the short side wall 12 are fixed to each other. Further, in the state where the short side wall 12 is erected, the protruding wall portion 74 provided on the vertical wall portion 70b of the fitting member 70 is disposed on the outer surface side of the short side wall 12, and the short side wall 12 is moved from the outer surface side. To support.

In addition, what is necessary is just to perform said operation in reverse order, when folding the container 10 in the state assembled in the box shape.
Next, the operation of this embodiment will be described.

As shown in FIG. 8, the container 10 of this embodiment can be stacked in multiple stages.
As shown in FIG. 8A, when the assembled containers 10 are stacked, a first engagement protrusion 38 provided on the short side wall 12 (short side engagement member 30) of the lower container 10, and The second engagement protrusion 57 provided on the long side wall 13 (long side engagement member 50) is fitted in the inner recess 76 provided on the fitting member 70 (bottom wall 11) of the upper container 10. Thereby, the position shift of the horizontal direction between the containers 10 of the upper and lower stages is controlled.

  Here, the inner concave portion 76 is formed in a groove shape, and wall portions exist on both sides thereof. Therefore, when the containers 10 are stacked, when a force F (force in the direction of expanding the opening) is applied to the upper part of each side wall of the lower container 10, the first engagement protrusions 38 and The second engaging projection 57 abuts on the outer wall of the inner recess 76 of the upper container 10. Thereby, the deformation of the side wall in the direction of expanding the opening of the container 10 is restricted, and the upper container 10 is prevented from falling into the lower container 10.

  Further, when a force pushing inward (force in the direction opposite to the force F) is applied to the upper part of each side wall of the lower container 10, the first engagement protrusion 38 and the second engagement protrusion 57 contacts the inner wall of the inner recess 76 of the upper container 10. Thereby, the deformation | transformation of the side wall in the direction which narrows the opening part of the container 10 is controlled.

  As shown in FIG. 8B, when the folded containers 10 are stacked, the protruding wall portion 74 provided on the fitting member 70 (bottom wall 11) of the lower container 10 has an upper container. It fits in the outer recessed part 75 provided in 10 fitting members 70 (bottom wall 11). Thereby, the position shift of the horizontal direction between the containers 10 of the upper and lower stages is controlled.

Next, the effect of this embodiment will be described.
(1) A first engagement protrusion 38 and a second engagement protrusion 57 are provided on the side of the upper end surface of each of the short side wall 12 and the long side wall 13 of the container 10. At the corner of the bottom wall 11, a short side wall 12 that is in a folded state and a protruding wall portion 74 that projects upward from the long side wall 13 are provided along the periphery thereof. On the bottom surface of the corner of the bottom wall 11, a groove-shaped inner recess 76 that can be engaged with the first engagement protrusion 38 and the second engagement protrusion 57 when stacking the assembled containers 10, and an inner recess An outer recess 75 that is provided on the peripheral side from 76 and that can be engaged with the protruding wall 74 when the folded containers 10 are stacked is provided.

  According to the said structure, it can stack stably in an assembly state and a folding state. Further, the first engagement protrusion 38 and the second engagement protrusion 57 abut on the outer wall of the inner recess 76 of the upper container 10, and the side wall is deformed in the direction of expanding the opening of the container 10. By being regulated, the load acting on the hinge portion and the engagement portion between the engagement members is reduced.

  Further, when the assembled containers 10 are stacked, the first engagement protrusion 38 and the second engagement protrusion 57 are inserted into the inner recess 76. When the folded containers 10 are stacked, the projecting wall portion 74 is inserted into the outer recessed portion 75. Therefore, even if the upper container 10 is slightly moved up and down with respect to the lower container 10 due to vibration during transportation, the first engagement protrusion 38 and the second engagement protrusion 57 from the inner recess 76. Or the protruding wall portion 74 is removed from the outer recessed portion 75, and the upper container 10 is prevented from dropping off. In particular, when the folded containers 10 are stacked, the short side wall 12 and the long side wall 13 of the lower container 10 are arranged between the bottom wall 11 of the lower container 10 and the bottom wall 11 of the upper container 10. Thus, the gap between the bottom walls 11 of the upper and lower containers 10 is reduced. Therefore, the drop-off preventing effect of the container 10 becomes higher.

  (2) The engagement structure provided on the lower surface of the bottom wall 11 of the container 10 to be engaged with the lower container 10 at the time of stacking is formed by partial recesses (inner recess 76 and outer recess 75). Therefore, a substantially entire surface of the lower surface of the bottom wall 11 of the container 10 can be formed flat to ensure a large grounding surface. In this case, since the load which acts on the container 10 can be received by the whole lower surface of the bottom wall 11, a deformation | transformation of the bottom wall 11 is suppressed. Moreover, when moving the container 10 using a conveyor, it becomes the container 10 which is easy to flow on a conveyor.

  (3) The outer recessed portion 75 is a recessed portion that is open outward and downward. According to the above configuration, there is no need to provide a wall portion on the outer peripheral side of the outer recess 75 as in the case where the outer recess 75 is formed in a groove shape that opens downward (broken line portion in FIG. 8B). It can avoid that the outer periphery shape of the lower part of the container 10 becomes large. In the folded container 10, since the folded side walls are located on the bottom wall 11, the outer concave portion 75 may be formed as a concave shape opened outward (each side edge side). It is unlikely that the upper container 10 falls into the container 10.

(4) The main body 10a of the container 10 is formed of a hollow plate material. According to the said structure, the container 10 can be reduced in weight.
In addition, the said embodiment can also be changed and actualized as follows. Moreover, it is also possible to change the said embodiment like the structure of the following modification example mutually combining and the combination.

The outer concave portion 75 may also be formed in a groove shape that opens downward (see the broken line portion in FIG. 8B).
The specific configuration of the engagement configuration between the first engagement projection 38 and the second engagement projection 57 and the inner recess 76 is particularly limited as long as it is an engagement configuration based on the unevenness. is not. The same applies to the engagement configuration between the protruding wall portion 74 and the outer concave portion 75.

  -Although the 1st engagement protrusion 38 was formed as a protrusion extended in the width direction of the short side wall 12, the shape of the 1st engagement protrusion 38 is not limited to this. For example, a plurality of protrusions arranged in parallel in the width direction of the short side wall 12 may be used. The same applies to the second engagement protrusion 57.

  In the above embodiment, the first engagement protrusions 38 are provided on both sides of the upper end surface of the short side wall 12, that is, on both sides of the upper end surface of the short side engagement member 30, but only on one side of the upper end surface. The first engagement protrusion 38 may be provided. In addition, the second engagement protrusions 57 are provided on both upper end surfaces of the long side wall 13, that is, on the respective upper end surfaces of the long side engagement members 50 disposed on both side portions of the long side wall 13. The second engagement protrusion 57 may be provided only on the upper end surface of the side engagement member 50. In this case, the outer recess 75 and the inner recess 76 can be omitted as appropriate.

  In the fitting member 70, the protruding wall portion 74 is formed on the upper end surfaces of the vertical wall portion 70b and the horizontal wall portion 70c, respectively, and is formed in an L shape as viewed from above. You may form only in the upper end surface of the wall part 70b, or the upper end surface of the horizontal wall part 70c.

  Although each of the fitting members 70 arranged at the corners of the bottom wall 11 is provided with the protruding wall portions 74, the protruding wall portions 74 are provided only at the fitting members 70 arranged at specific corners. It is good. For example, the protruding wall portion 74 may be provided only on the fitting member 70 arranged at one of the two corners located diagonally on the bottom wall 11.

  -In above-mentioned embodiment, although the inner side recessed part 76 was formed in the bottom view L-shape, the shape of the inner side recessed part 76 is not limited to this. For example, a first inner concave portion that is I-shaped in a bottom view formed along a side edge on the vertical wall portion 70b side, and a second inner side that is I-shaped in a bottom surface view formed along a side edge on the side of the horizontal wall portion 70c. The shape divided | segmented into the recessed part may be sufficient.

  In the above embodiment, the outer concave portion 75 and the inner concave portion 76 are formed on the lower surface of the fitting member 70. However, the outer wall 75 is formed on the lower surface of the fitting member 70, and the bottom wall is made of a hollow plate material. It is good also as a structure which forms the inner side recessed part 76 in the lower surface of the part 11a. Moreover, you may provide the outer side recessed part 75 and the inner side recessed part 76 in the lower surface of the bottom wall part 11a. Further, as shown in FIGS. 9A and 9B, the outer concave portion 75 and the inner concave portion 76 may be formed by combining the bottom wall portion 11 a and the fitting member 70.

-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.
-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.

  -In the said embodiment, although a part of container 10 was comprised by the hollow plate material, like the container of patent document 1, it is a container comprised combining the molded product shape | molded by injection molding etc. There may be.

-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.
Next, the technical idea that can be grasped from the embodiment and the modified examples will be described.

  (A) The bottom wall includes a bottom wall portion formed by the hollow plate member and a fitting member attached to a corner portion of the bottom wall portion, and at least one of the outer concave portion and the inner concave portion is The folding container provided on the lower surface of the fitting member.

  (B) The bottom wall includes a bottom wall portion formed by the hollow plate member and a fitting member attached to a corner portion of the bottom wall portion, and at least one of the outer concave portion and the inner concave portion is The folding container formed by combining the bottom wall portion and the fitting member.

  DESCRIPTION OF SYMBOLS 10 ... Folding container, 11 ... Bottom wall, 11a ... Bottom wall part, 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 portion (second side wall portion), 30... Short side engaging member (first engaging member), 38... First engaging protrusion, 50. ... 2nd engagement protrusion, 70 ... fitting member, 74 ... engagement wall part, 75 ... outer side recessed part, 76 ... inner side recessed part.

Claims (3)

A rectangular plate-shaped bottom wall, said standing on the periphery of the bottom wall comprises a first sidewall and a second sidewall of each pair consisting of a hollow plate material with opposite said first sidewall and said on the bottom wall first In a folding container configured to be foldable on two side walls,
Engaging protrusions are provided on the upper end surface side portions of the first side wall and the second side wall,
The corners on the upper surface side of the bottom wall are provided along the peripheral edge thereof, and provided with protruding wall portions that protrude upward from the first side wall and the second side wall in a folded state,
In the corner on the lower surface side of the bottom wall, when stacking containers in an assembled state, a groove-shaped inner recess that can be engaged with the engagement protrusion, and a peripheral side from the inner recess, when stacking the folded state the container, engageable with the outer recess provided we are on the projecting wall portion,
The outer concave portion is a concave portion opened downward,
When stacking folded containers, an upper end of the protruding wall portion is in contact with a lower surface of the outer concave portion .   The folding container according to claim 1, wherein the outer recess is a recess having a shape opened outward and downward. The first side wall includes a first side wall part formed of a hollow plate made of synthetic resin having a hollow structure, and first engaging members attached to both side parts of the first side wall part,
The second side wall is attached to a second side wall portion formed by the hollow plate member and both side portions of the second side wall portion, and engages with the first engagement member in the assembled state, thereby the first side wall. And a second engaging member for fixing the second side wall,
The folding container according to claim 1, wherein the engagement protrusion is provided on an upper end surface of the first engagement member and the second engagement member.