JP6359465B2 - Folding container - Google Patents

Description

  The present invention relates to a folding container used for transporting articles.

  Conventionally, a bottom wall constituting part having a substantially rectangular plate shape and a base part protruding upward along each side part of the bottom wall part, and rotating with respect to each base part, respectively. 2. Description of the Related Art A folding container is known that includes a side wall portion that can be connected to each other and can be assembled into a box shape that opens upward, and can fold each side wall portion above a bottom wall portion. In addition, the folding containers are stably stacked one above the other in order to improve the efficiency of transportation and storage of the articles using the folding containers and the transportation and storage of the folding containers themselves that do not contain the articles ( It has a configuration that can be stacked). More specifically, the support rib that protrudes downward from the lower surface of the bottom wall portion and supports the folding container is configured so that the inner circumference of the side wall portion of the lower folding container when the folding containers in the assembled state are stacked. It is provided so as to be inserted (substantially fitted) to the side.

  However, when adopting such a configuration, with respect to a portion on the outer peripheral side of the bottom wall portion (a portion where the base portion is formed on the upper surface side of the bottom wall portion and supports the side wall portion of the folding container in an assembled state) Since the support rib is not provided, the outer peripheral portion of the bottom wall portion may be easily deformed. Therefore, when stacking the folded containers in an assembled state, the base portion formed on the upper surface side of the bottom wall portion outer peripheral portion tilts to the bottom wall portion outer peripheral side together with the bottom wall portion outer peripheral portion. There is a concern that the side wall portion supported by the base portion may be tilted so as to open outward as the base portion tilts. Thus, if the side wall of the lower folding container is tilted so as to open outward, in some cases, the upper folding container partially loses support by the side wall of the lower folding container. Etc., there is a risk of inconvenience such as falling into the inside of the lower folding container.

  On the other hand, in order to suppress deformation of the outer peripheral portion of the bottom wall portion, a bottom wall protruding portion that protrudes downward from the outer peripheral portion of the bottom wall portion is provided, and folding containers that are in an assembled state are stepped on the upper side portion of the side wall portion. In the case of stacking, there is a technique of providing a recess for accommodating the bottom wall protrusion of the upper folding container (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2005-186743

  By the way, as a structure for stacking the folding containers in the assembled state, there is a problem that the side wall portion of the lower folding container that supports the upper folding container is deformed so as to open outward. There is a point. Such a problem cannot be solved only by providing the bottom wall protrusion. In particular, there is a possibility that the concern that the side wall portion itself is deformed by the amount by which the deformation of the outer peripheral portion of the bottom wall portion is suppressed by providing the bottom wall protrusion may become more prominent.

  The present invention has been made to solve the above-described problems and the like, and its purpose is to suppress deformation of the side wall during stacking and to improve stacking workability. It is to provide a folding container that can be used.

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to a corresponding means are added as needed.

Means 1. A bottom wall portion having a substantially rectangular plate shape, a base portion protruding upward along each side portion of the bottom wall portion, and a base on which the base portion is formed on the upper surface side of the bottom wall portion A bottom wall constituting portion comprising a support rib projecting downward from the lower surface of the inner peripheral side of the formation range;
A side wall portion pivotably connected between a standing position standing above the base portion and a laying position folded above the bottom wall portion with respect to each base portion. In the folding container,
A bottom wall protrusion that protrudes downward from the bottom surface of the bottom wall in the base formation range;
When the folding containers in the assembled state in which all the side wall portions are in the upright position are stacked one above the other at the upper side portion of the side wall portions, the folding is superimposed on the upper side. And a housing recess for housing the bottom wall protrusion of the container,
When the folding containers provided in the housing recess and stacked in the assembled state are vertically stacked, the bottom wall protrusion of the upper folding container faces the inner wall side of the bottom wall portion, A positioning convex part that abuts or approaches the wall protrusion,
Of the positioning convex portion of the lower folding container in the assembled state, the inner surface of the lower container convex portion that is the surface on the inner peripheral side of the bottom wall portion, and the bottom wall portion of the bottom wall protrusion of the upper folding container. From the state where the folded containers are stacked one above the other so as to face the outer surface of the upper container projecting portion which is the outer peripheral surface,
When the upper and lower folding containers are relatively moved in the horizontal direction so that the inner surface of the lower container convex portion and the outer surface of the upper container protrusion are close to each other, the bottom wall protrusion of the upper folding container is A climbing guide means that is displaced obliquely upward with respect to the positioning convex part of the folding container on the side ,
The base portion connects the pair of first base portions provided along a pair of opposite side portions of the bottom wall portion and both ends of the pair of first base portions, respectively. A pair of second base parts provided along the side part of the bottom wall part,
The side wall includes a pair of opposing first side walls connected to the first base and a pair of opposing second side walls connected to the second base.
The bottom wall protrusion is provided in a part located below the first base part and a part located below the second base part in the base forming range,
The housing recess is provided in the first side wall and the second side wall,
The positioning convex part is provided on at least the first side wall part of the first side wall part and the second side wall part,
Among the first side wall and the second side wall, at least the storage recess of the second side wall is inclined downward toward the lateral center of the second side wall, and the storage recess An auxiliary projection as the overpass guide having an inclined surface continuous with the bottom surface of
In the lower container convex part inner surface of the positioning convex part provided on the first side wall part of the lower folding container in the assembled state, and at a part located below the first base part of the upper folding container From the state where the folded containers are stacked one above the other in the same direction, so as to face the outer surface of the upper container protrusion of the bottom wall protrusion provided.
In the case where the upper and lower folding containers are relatively moved in the horizontal direction so that the inner surface of the lower container protrusion and the outer surface of the upper container protrusion are brought close to each other,
The said provided in the site | part located under the said 2nd base part of an upper folding container with respect to the said inclined surface of the said auxiliary | assistant protrusion provided in the said accommodation recessed part of the said 2nd side wall part of a lower folding container. A folding container, wherein a bottom wall protrusion abuts and is guided obliquely upward .

  According to the means 1, when the folding containers in the assembled state are stacked up and down, the bottom wall protrusion of the upper folding container is accommodated in the accommodating recess of the lower folding container. The accommodation concave portion is provided with a positioning convex portion that faces or is close to the bottom wall projection, facing the inner wall side (inner surface) of the bottom wall portion of the bottom wall projection of the upper folding container. It has been. For this reason, for example, when the side wall of the lower folding container tries to be deformed so as to open to the outside of the folding container due to the weight of the folding container placed on the upper side, the bottom wall protrusion of the upper folding container The inner surface of the portion and the outer surface side surface (outer surface) of the side wall portion of the positioning convex portion come into contact with each other. Therefore, the bottom wall protrusion of the upper folding container can regulate the displacement of the positioning container of the lower folding container to the outside, and hence the deformation of the side wall to the outside. As a result, the stacked state can be stabilized, and the efficiency of transporting and storing the folded container can be improved.

  In general, when stacking the folding containers, if the relative position in the horizontal direction of the folding container placed on the upper side of the folding container in the assembled state is slightly shifted, the folding container placed on the upper side is replaced with the lower folding container. It is slid to the upper side of the side wall of the slidable slide (sliding and stacking) until the relative position matches.

  However, when the positioning convex portion is provided in the housing concave portion as in the means 1, even if the slide stack as described above is performed, the bottom convex portion of the positioning convex portion of the lower folding container in the assembled state is provided. The inner surface of the lower container convex portion, which is the peripheral surface, and the outer surface of the upper container protrusion, which is the outer peripheral surface of the bottom wall portion, of the bottom wall protrusion of the upper folding container are in contact with each other, and further relative displacement occurs. There is concern about being regulated. For this reason, the bottom wall protrusion of the upper folding container is slid into the receiving recess of the lower folding container, that is, the sliding stack of the folding container becomes impossible, and the stacking workability is reduced. There is a risk of it.

  On the other hand, according to the means 1, the folding container placed on the upper side of the folding container in the assembled state is shifted from the lower folding container so as to match the relative position of the folding container with the lower folding container. A sliding guide means for displacing the bottom wall protrusion of the upper folding container obliquely upward with respect to the positioning convex part of the lower folding container when sliding on the upper side of the side wall of Is provided. For this reason, even in the configuration in which the positioning convex portion is provided in the housing concave portion, the slide stack can be performed, and the stacking workability can be improved.

Further , according to the means 1 , the positioning projection provided on the first side wall portion of the lower folding container is provided with the bottom wall projection provided on the lower side of the first base portion of the folding container. In the configuration in which the slide stack can be accommodated so as to be accommodated in the accommodation recess provided in the first side wall portion of the lower folding container, the overpass guide means is formed in the accommodation recess of the second side wall portion. For this reason, the bottom wall protrusion provided in the site | part located under the 1st base part of the lower container convex part of the positioning convex part provided in the 1st side wall part of the lower side folding container, and the upper folding container It can be set as the structure in which a slide stack is possible, without contacting the upper container protrusion outer surface of a part. Therefore, it is possible to more reliably prevent the positioning convex portion from being damaged during the slide stack.

Moreover, it is necessary to incline the inclined surface of an auxiliary | assistant protrusion along the advancing direction of a folding container in the case of performing a slide stack. In this means 1 , the bottom wall protrusion provided at the position located below the first base portion of the upper folding container gets over the positioning projection provided on the first side wall portion of the lower folding container. The slide stacking is performed, and the inclined surface of the auxiliary protrusion is configured to be inclined in the direction of the thickness of the first side wall and the width of the second side wall. Therefore, according to this means 2, by providing the auxiliary projection on the second side wall, for example, the auxiliary projection is provided on the first side wall, and the inclined surface of the auxiliary projection is inclined in the thickness direction of the first side wall. Compared to such a case, it is possible to ensure a longer distance required to climb the inclined surface of the auxiliary protrusion without increasing the protrusion length of the auxiliary protrusion. Therefore, for example, even when the auxiliary projection for overcoming the positioning projection provided on the first side wall portion over the bottom wall projection is provided on the first side wall portion, the thickness of the first side wall portion is relatively thin. Thus, it is possible to avoid such a situation that the inclined surface of the auxiliary protrusion becomes too steep and the guiding effect by the inclined surface of the auxiliary protrusion is not suitably achieved.

  In addition, the bottom wall protrusion is provided not only in the part located below the first foundation part but also in the part located below the second foundation part in the base formation range, so that the bottom wall protrusion is By providing, the effect of increasing the rigidity of the base formation range is exhibited over the entire base formation range. Further, “the bottom wall protrusion provided at a position located below the second base portion of the upper folding container guided by the inclined surface of the auxiliary protrusion of the lower folding container is the auxiliary protrusion. In the case of overcoming, the bottom wall protrusion provided at a portion located below the first base portion of the upper folding container also gets over the positioning convex portion and is accommodated in the accommodating concave portion. It may be “to be in a state”. In this case, the above-described effects such as prevention of damage to the positioning convex portion during the slide stack can be achieved more reliably.

Means 2 . The surface of the auxiliary projection opposite to the inclined surface is configured as an orthogonal surface extending in a direction orthogonal to or near a direction perpendicular to the upper surface of the upper side portion of the side wall portion on which the auxiliary protrusion is provided. The folding container according to Means 1 , wherein the folding container is provided.

According to the means 2 , for example, in the stacked state of the folding containers, when a force directed in the direction along the widthwise direction of the second side wall part acts on the upper folding container, the auxiliary projection of the second side wall part And the bottom wall protrusion provided in the part located below the second base portion can be configured to contact each other. Accordingly, the bottom wall protrusion provided in the portion located below the second base portion rides on the auxiliary protrusion from the surface side opposite to the inclined surface of the auxiliary protrusion, so that the first base portion It is possible to more reliably prevent a situation in which a bottom wall protrusion provided at a portion located below the surface rises, falls over the positioning protrusion, and falls off the receiving recess. As a result, the stacked state can be further stabilized.

  In addition, for example, in a stacked state, when the upper folding container is about to be displaced relative to the lower folding container in the horizontal direction, the bottom wall provided in a portion located below the first base portion At the same time when the protrusion comes into contact with the surface on the outer peripheral side of the bottom wall portion of the positioning convex portion, or at a stage prior to that, the bottom wall protrusion provided at the site located below the second base portion is By constituting the auxiliary projection (orthogonal plane) so as to abut, the positioning projection can be protected.

It is the perspective view which looked at the folding container in an assembly state from the upper surface side. FIG. 2 is a partially enlarged perspective view of FIG. 1. It is the perspective view which looked at the folding container in an assembly state from the lower surface side. FIG. 4 is a partially enlarged perspective view of FIG. 3. It is the perspective view which looked at the folding container in a folded state from the upper surface side. The left half is a bottom view of the folding container, and the right half is a top view of the folding container in an assembled state. It is a perspective view containing the partial cross section which shows the folding container in a stacked state. FIG. 8 is a partially enlarged perspective view of FIG. 7. (A) is the cross-sectional schematic diagram of the folding container in an assembly state, (b) is explanatory drawing for demonstrating the slide stack of a folding container (a lower folding container is shown in a cross section and an upper folding container Is a side view). It is a layout of the folding container for explaining pinhole stacking. (A) is a plane schematic diagram of the folding container for demonstrating pinhole stacking, (b) is a lower surface schematic diagram of a folding container. It is a partial expansion perspective view of the folding container in another embodiment. It is a partial expansion perspective view of the folding container in another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. As shown in FIGS. 1, 3, 5, and the like, the folding container 1 includes a bottom wall portion 3 having a substantially rectangular plate shape, and an upper side from the bottom wall portion 3 along each long side portion of the bottom wall portion 3. A bottom wall constituting part 2 comprising a long side base part 4 projecting to the bottom and a short side base part 5 projecting upward from the bottom wall part 3 along each short side part of the bottom wall part 3; A long side wall 6 provided to be rotatable with respect to each long side base 4 and a short side wall 7 provided to be rotatable with respect to each short side 5 And. In the present embodiment, the bottom wall constituting part 2, the long side wall part 6, and the short side wall part 7 are made of polypropylene. Moreover, in this embodiment, the long side side base part 4 comprises a 1st base part, the short side side base part 5 comprises a 2nd base part, and the long side side wall part 6 comprises a 1st side wall part. The short side wall 7 constitutes the second side wall.

  The long side wall portion 6 and the short side wall portion 7 are respectively provided in a standing position (see FIG. 1) standing above the long side base portion 4 and the short side base portion 5, and the bottom wall portion 3. It is configured to be able to rotate and displace between a laying position (see FIG. 5) that is folded upward and extends substantially parallel to the bottom wall 3. Moreover, in this embodiment, the protrusion length from the bottom wall part 3 of the long side side base part 4 is longer than the protrusion length from the bottom wall part 3 of the short side side base part 5, and it is a long side side wall. The formation position of the long side bearing portion 8 for supporting the portion 6 so as to be rotatable is also higher than the formation position of the short side bearing portion 9 for supporting the short side wall portion 7 so as to be rotatable. Located (see FIG. 1). Furthermore, each short side base part 5 is provided so that the inner surfaces of a pair of opposing long side base part 4 may be connected. For this reason, in this embodiment, unless the short side wall part 7 is folded first, the long side wall part 6 cannot be folded. Then, as shown in FIG. 5, in the folded state of the folding container 1 in which all the long side wall portions 6 and the short side wall portions 7 are in the sleeping position, the short side wall portions 7 are formed on the bottom wall portion 3. The long side wall 6 is folded so as to overlap (facing) the upper surface, and the long side wall 6 is folded so as to overlap the already folded short side wall 7.

  As shown in FIGS. 1, 3, 5, etc., each long side wall 6 has substantially the same width as the long side base 4 in the longitudinal direction, and the folding container 1 is assembled in a box shape. In the assembled state, a substantially flat long-side base plate 11 constituting the inner surface of the long-side side wall 6, an upper frame portion 12 provided along the upper side of the long-side base plate 11, and a long A long side lower rib 13 extending outward from the lower side of the side base plate 11 and a substantially T-shape projecting downward from the lower surface of the long side lower rib 13 and pivotally supported by the long side bearing 8 And a long side hinge part 14 having a shape.

  The upper frame portion 12 extends from the upper side portion of the long side base plate 11 outward at a substantially right angle and extends from the outer edge of the frame lower rib 12a upward at a substantially right angle. The frame outer rib 12b is provided, and the frame upper rib 12c extending inward from the upper end edge of the frame outer rib 12b at a substantially right angle, and has a substantially U-shaped cross section. In addition, the upper frame portion 12 is provided with a frame reinforcing rib 12d that connects the upper surface of the lower frame rib 12a, the inner surface of the outer frame rib 12b, and the lower surface of the upper frame rib 12c as appropriate.

  In addition, the long-side base plate 11 protrudes from the inner surface of the long-side base plate 11 on both sides (the surface facing the inner peripheral side of the bottom wall portion 3 in the standing position and facing down in the lying position). A locking wall 17 is provided. Each locking wall 17 is formed with an insertion hole 18 penetrating in the lateral width direction of the long side wall portion 6.

  As shown in FIG. 1, FIG. 3, FIG. 7, etc., each short side wall 7 has a width substantially the same as the length of the short side base 5 in the longitudinal direction, and the folding container 1 is assembled in a box shape. In the assembled state, a substantially flat short-side base plate 21 constituting the inner surface of the short-side side wall 7 and a short-side upper rib extending outward from the upper side of the short-side base plate 21. 22, a short-side lower rib 23 extending outward from the lower side of the short-side base plate 21, and a lower side of the short-side lower rib 23 projecting downward and pivotally supported by the short-side bearing 9. And a substantially T-shaped short side hinge portion 24 (see FIG. 1).

  Further, the short side base plate 21 is provided with insertion protrusions 27 that protrude from the outer surface of the short side base plate 21 on both sides. The insertion protrusion 27 is provided corresponding to the insertion hole 18 formed in the locking wall 17 of the long side wall portion 6. Then, after the long side wall portion 6 is erected, the short side wall portion 7 is erected, whereby the insertion protrusion 27 is inserted into the insertion hole 18 and the insertion protrusion 27 of the short side base plate 21 is The peripheral part is supported by the locking wall 17 (see FIG. 1).

  Further, as shown in FIGS. 1, 7, and the like, on the outer surface side of the short side wall 7, the inner wall of the short side wall 7 is prevented from falling down below the short side upper rib 22. A lock mechanism installation portion 29 in which the lock mechanism 28 is installed is provided. The lock mechanism 28 is configured to be slidable along the width direction of the short side wall 7 on both sides of the operation unit 30 and the operation unit 30 provided in the center in the width direction of the lock mechanism installation unit 29. A pair of left and right slide pieces 31 that can be projected and retracted with respect to an outer region of a portion of the side base plate 21 that is in contact with and supported by the locking wall 17 of the long side wall 6 in the assembled state of the folding container 1. It has.

  On the other hand, the long side wall 6 is provided with a locking projection (not shown) that locks with the inner surface of the tip of the slide piece 31 protruding into the rear region in the assembled state of the folding container 1. It has been. Further, by operating the operation unit 30, the pair of slide pieces 31 are interlocked so that the locked state between the slide piece 31 and the locking convex portion can be released. In addition, about the slide piece 31 and the operation part 30, it is urged | biased by the side by which the latching state of the slide piece 31 and a latching convex part is maintained by the elastic piece which is not shown in figure.

  The distance between the pair of short side base parts 5 is longer than twice the height (vertical width) of the short side wall part 7 (short side base plate 21). For this reason, the height of the laying position of the pair of short side wall portions 7 is made uniform. On the other hand, the distance between the pair of long side base parts 4 is shorter than twice the height (vertical width) of the long side wall part 6 (long side base plate 11). Further, the long-side bearing portion 8 is configured to allow displacement in the vertical direction of the long-side hinge portion 14 of the long-side side wall portion 6 at the laying position. For this reason, when folding the folding container 1, after displacing one long side side wall part 6 to a sleeping position among a pair of long side wall parts 6, the other long side wall part 6 is It is displaced to the laying position so as to be overlaid on one long side side wall portion 6 which has already been laid down. That is, the pair of long side wall portions 6 are folded so as to overlap each other.

  Further, as shown in FIG. 3 and the like, the bottom wall constituting portion 2 includes a base formation range 41 in which a long side base portion 4 and a short side base portion 5 are formed on the upper surface side of the bottom wall portion 3. Also, a support rib 42 that protrudes downward from the lower surface of the inner peripheral portion is provided. The support rib 42 includes an outer peripheral rib 43 provided along the boundary with the base formation range 41 and an inner peripheral rib 44 provided in a substantially lattice shape on the inner peripheral side of the outer peripheral rib 43.

  As shown in FIGS. 3, 4, 6, and the like, the base formation range 41 is provided with a bottom wall protrusion 45 that protrudes downward from the lower surface of the bottom wall 3. The bottom wall protrusion 45 includes a protrusion main body 48 provided at a position separated from the support rib 42 (outer peripheral rib 43), and a reinforcing wall portion 49 that connects between the protrusion main body 48 and the outer peripheral rib of the support rib 42. It has. Further, the protruding length of the reinforcing wall portion 49 from the bottom wall portion 3 is shorter than the protruding length of the protruding body 48 from the bottom wall portion 3. Furthermore, in this embodiment, the lower side part of the support rib 42 and the lower end part of the protrusion main body 48 of the bottom wall protrusion 45 are at the same height position, and the folding container 1 is installed on a flat floor surface. In this case, the support rib 42 and the bottom wall protrusion 45 are grounded, and the bottom wall protrusion 45 supports the folding container 1 together with the support rib 42.

  Further, in the present embodiment, four bottom wall protrusions 45 (hereinafter also referred to as “long side bottom wall protrusions 46”) in the portions corresponding to the long side base portions 4 in the base formation range 41. And two bottom wall projections 45 (hereinafter also referred to as “short side bottom wall projections 47”) are provided at portions corresponding to the respective short side base portions 5. In addition, the width in the longitudinal direction of the bottom wall portion 3 of the present embodiment is slightly shorter than the length twice the width in the short direction of the bottom wall portion 3.

  On the other hand, as shown in FIGS. 1, 2, 8, etc., the frame upper rib 12 c of the upper frame portion 12 of the long side wall portion 6 and the short side upper rib 22 of the short side wall portion 7. The folding containers 1 that are formed so as to open upward and inward and in which the side walls 6 and 7 are in an upright position are stacked vertically in the same direction (stacked). ), The long-side housing recess 51 in which the long-side bottom wall projection 46 and the short-side bottom wall projection 47 of the folding container 1 stacked on the upper side are housed, and the short-side housing recess. 52 is provided. The bottom surface of the long-side housing recess 51 and the bottom surface of the short-side housing recess 52 are the top surface of the frame upper rib 12c of the long-side side wall 6 and the short-side upper side of the short-side side wall 7. The rib 22 extends substantially parallel to the upper surface.

  As shown in FIGS. 7 and 8, when the folding containers 1 in an assembled state are stacked, the support ribs 42 of the upper folding container 1 have the long side wall portion 6 of the lower folding container 1. And the long side bottom wall projection 46 and the short side bottom wall projection 47 of the upper folding container 1 are inserted into the inner peripheral side of the short side wall 7, and the long side of the lower folding container 1 While being accommodated in the accommodating recess 51 and the short-side accommodating recess 52, the lower surface of the bottom wall 3 (base formation range 41) of the upper folding container 1 is the upper rib 12c on the frame and the short side of the lower folding container 1 It abuts on the side upper side rib 22 and is supported.

  Further, as shown in FIG. 2, FIG. 9A, and the like, the long-side housing recess 51 has a side surface on the inner surface side of the long-side side wall portion 6 in the bottom surface of the long-side housing recess 51. A positioning convex portion 53 protruding upward is provided. The protruding length of the positioning convex portion 53 is configured to be shorter than the depth of the long side accommodation recess 51 (the distance from the upper surface of the frame upper rib 12c to the bottom surface of the long side accommodation recess 51). When the folding containers 1 in the assembled state are stacked, the positioning convex portion 53 of the lower folding container 1 is the inner circumference of the bottom wall portion 3 of the bottom wall protrusion 45 of the upper folding container 1. Opposite to the side surface, the bottom wall projection 45 is configured to abut or approach.

  Further, the short side accommodation recess 52 is provided with an auxiliary projection 54 as a climbing guide means that projects upward from the bottom surface of the short side accommodation recess 52. The auxiliary protrusion 54 is inclined downward toward the lateral side central portion of the short side wall 7, and has an inclined surface 55 that is continuous with the bottom surface of the short side accommodating recess 52, and the short side from the upper side of the inclined surface 55. From the upper surface 56 extending in parallel with the upper side portion of the short side wall portion 7 toward the side portion side of the side wall portion 7, and from the side portion of the upper surface 56 on the side portion side of the short side wall portion 7, downward And an orthogonal surface 57 extending in a direction substantially orthogonal to the upper side of the short side wall 7. In addition, the orthogonal surface 57 of the auxiliary protrusion 54 is in contact with the bottom surface of the short-side housing recess 52 extending in parallel with the short-side upper ribs 22 substantially perpendicularly. In addition, the protruding length of the auxiliary protrusion 54 from the bottom surface of the receiving recess 52 is slightly longer than the protruding length of the positioning protrusion 53 from the bottom surface of the storing recess 52.

  By providing the auxiliary protrusions 54 as described above, when the folding containers 1 are stacked, when the relative position in the horizontal direction of the folding container 1 placed on the upper side of the folding container 1 in the assembled state is slightly shifted (dare The folding container 1 placed on the upper side is slid on the upper side parts of the side wall parts 6 and 7 of the lower folding container 1 and is slid until the relative position matches (sliding). Stacking). That is, as shown in FIG. 9B, of the positioning wall 53 (projecting body 48) provided on the long side wall 6 of the lower folding container 1 in the assembled state, The inner surface 61 of the lower container convex portion that is the inner peripheral surface and the outer surface 62 of the upper container protrusion that is the outer peripheral surface of the bottom wall portion 3 of the long side bottom wall protrusion 46 of the upper folding container 1. The lower container convex portion inner surface 61 and the upper container protruding portion outer surface 62 are brought close to each other from a state in which the folding containers 1 are vertically stacked in the same direction (hereinafter also referred to as “temporarily stacked state”). In this way, when the upper and lower folding containers 1 are relatively moved in the horizontal direction, the inclined surface of the auxiliary projection 54 provided in the short side accommodation recess 52 of the short side wall 7 of the lower folding container 1. 55, the short side bottom wall projection 47 (projection body 48) of the upper folding container 1 abuts diagonally upward. It is adapted to be guided.

  More specifically, when the upper folding container 1 is slid from the temporarily stacked state to the stacked state, the positioning convex portion 53 (lower container convex portion inner surface 61) of the lower folding container 1; Before the abutment with the long side bottom wall protrusion 46 (upper container protrusion outer surface 62) of the upper folding container 1, the upper folding container 1 is placed on the upper surface with respect to the inclined surface 55 of the auxiliary protrusion 54 of the lower folding container 1. The short side bottom wall protrusion 47 of the folding container 1 contacts. Furthermore, by continuing the slide, the short side bottom wall protrusion 47 of the upper folding container 1 is guided obliquely upward by the inclined surface 55 of the auxiliary projection 54 of the lower folding container 1, and accordingly, Long side bottom wall projection 46 of the upper folding container 1 (long side side bottom wall located on the far side in the sliding direction from the short side bottom wall projection 47 guided by the inclined surface 55 of the auxiliary projection 54) The protrusion 46) is also displaced obliquely upward.

  When the short side bottom wall protrusion 47 of the upper folding container 1 climbs up the inclined surface 55 of the auxiliary projection 54 of the lower folding container 1 and reaches the upper surface 56, the upper folding is accompanied accordingly. The long side bottom wall protrusion 46 of the container 1 is positioned above the positioning protrusion 53. Furthermore, by continuing to slide, the lower surface of the short side bottom wall projection 47 of the upper folding container 1 slides on the upper surface 56 of the auxiliary projection 54 of the lower folding container 1, and accordingly, the upper side The long side bottom wall protrusion 46 of the folding container 1 passes above the positioning convex part 53 of the lower folding container 1.

  At the stage where the short side bottom wall protrusion 47 of the upper folding container 1 has finished passing the upper surface 56 of the auxiliary projection 54 of the lower folding container 1, the long side bottom wall protrusion 46 of the upper folding container 1. As for, the configuration is such that it passes over the positioning convex portion 53 of the lower folding container 1. Accordingly, the short-side bottom wall protrusion 47 of the upper folding container 1 gets over the auxiliary projection 54 of the lower folding container 1, and the region on the orthogonal surface 57 side of the auxiliary projection 54 in the short-side accommodation recess 52. If the upper side folding container 1 is in the accommodated state, the positioning projection 53 of the lower folding container 1 is also moved to the long side bottom wall projection 46 of the upper folding container 1 (without contacting the positioning projection 53). ) Get over and place in the long-side housing recess 51.

  As described above, the short-side-side bottom wall protrusion 47 of the upper folding container 1 is housed in the region on the orthogonal surface 57 side of the auxiliary protrusion 54 in the short-side housing recess 52 of the lower folding container 1. Then, the long side bottom wall projection 46 of the upper folding container 1 is placed in the long side receiving recess 51 of the lower folding container 1 so that the support ribs 42 of the upper folding container 1 are supported. Then, it is inserted into the inner peripheral side of the long side wall portion 6 and the short side wall portion 7 of the lower folding container 1, and the stacking is completed.

  Further, in the stacked state of the folding containers 1 in the assembled state, when the upper and lower folding containers 1 are relatively displaced in the short width direction of the bottom wall portion 3, the long side bottom wall protrusion 46 of the upper folding container 1. However, before or simultaneously with the positioning convex portion 53 of the lower folding container 1, the short side bottom wall protrusion 47 of the upper folding container 1 is connected to the auxiliary projection 54 of the lower folding container 1. Since it is configured to abut on the orthogonal surface 57, basically, the long side bottom wall protrusion 46 of the upper folding container 1 and the positioning convex part 53 of the lower folding container 1 are not in pressure contact with each other. It has become. However, when a relatively large force is applied from the upper side to the long side wall 6 of the lower folding container 1 in the stacked state of the folding containers 1 in the assembled state, the long side wall When trying to deform so that 6 opens outward, the positioning convex part 53 formed in the long side accommodation recessed part 51 of the said long side wall part 6 is the long side bottom of the upper folding container 1 It is configured to abut against the wall protrusion 46 and to restrict further deformation of the long side wall 6 to the outside.

  In addition, as shown in FIG. 5, the long side base part 4 protrudes upwards rather than a pair of long side side wall part 6 made into the laying position. Moreover, in this embodiment, in the long side base part 4, when the folding containers 1 that are opened upward and on the inner peripheral side of the bottom wall part 3 and are folded are stacked in the same direction, the upper side A folding housing recess 65 for receiving the long side bottom wall projection 46 of the folding container 1 stacked on the folding container 1 is provided. Furthermore, it is formed in the connection part with the long side base part 4 among the short side base parts 5 so that the right and left side parts of the long side base part 4 may protrude to the short side base part 5 side. A slide restricting portion 66 is provided. And when the folding containers 1 in the folded state are stacked, the support ribs 42 of the upper folding container 1 are above the long side wall 6 in the laying position and the long side base 4 And the long side bottom wall projection 46 of the upper folding container 1 is received in the folding recess 65 of the lower folding container 1 by being inserted (substantially fitted) into the region surrounded by the slide regulating part 66. In addition, the lower surface of the bottom wall portion 3 (base formation range 41) of the upper folding container 1 is in contact with and supported by the upper surface of the long side base portion 4 of the lower folding container 1. Yes.

  Moreover, in this embodiment, the folding container 1 in four assembled states is arranged as shown in FIG. 10A with respect to a pallet (not shown), and further, with respect to the upper side of the four folding containers 1, The four folding containers 1 are arranged as shown in FIG. 10B so that the folding containers 1 can be stacked (so-called pinhole stacking). That is, in FIG. 10, the four folding containers 1 all have one short side wall part 7 abutted against the long side wall part 6 of another folding container 1 and one long side wall. The part 6 is arranged so as to be abutted against the short side wall 7 of another folding container 1, and in FIG. 10 (a), the folding container 1 arranged on the upper left side of the page is installed sideways on the page. In FIG. 10B, the folding container 1 arranged at the upper left of the page is installed in the vertical direction on the page.

  For this reason, when the folding container 1 arranged as shown in FIG. 10 (b) is stacked on the upper side of the folding container 1 arranged as shown in FIG. 10 (a), the upper folding container 1 is It will be arrange | positioned so that the side wall parts 6 and 7 of the lower folding container 1 may be straddled (refer the dashed-two dotted line of Fig.11 (a)). Also, as shown in FIGS. 3 and 6, a portion straddling the side wall portions 6 and 7 of the lower folding container 1 when the above-described pinhole stacking is performed on the lower surface side of the bottom wall constituting portion 2. In the range including the central portion in the longitudinal direction of the bottom wall portion 3, the side wall accommodating recess 68 that can accommodate the upper side portions of the side wall portions 6, 7 of the lower folding container 1 is such that the support rib 42 is omitted. Is formed. By providing the side wall accommodating recess 68, the support rib 42 of the upper folding container 1 enters the inner peripheral side of the side wall parts 6 and 7 of the lower folding container 1 even when pinholes are stacked. Positioning can be performed by (substantially fitting).

  Further, in the present embodiment, as shown in FIG. 11 (a), even when the upper folding container 1 is installed across two folding containers 1 to perform pinhole stacking, the upper folding container is used. 1 is accommodated in the accommodating recesses 51 and 52 of the lower folding container 1 so as to avoid interference with the frame upper rib 12c and the short side upper side rib 22. . Furthermore, as shown in FIG. 3, FIG. 6, FIG. 11 (b), etc., in this embodiment, the side wall accommodating recess 68 is also divided into two island portions by forming the side wall accommodating recess 68. A bottom wall projection 45 (gap bottom wall projection 70) is provided adjacent to the support rib 42. When pinholes are stacked, the gap bottom wall projection 70 is also lowered. It is accommodated in the accommodating recess 52 of the side folding container 1.

  As shown in FIG. 3, lattice-shaped bottom wall reinforcing ribs 69 are provided at portions corresponding to the side wall accommodating recesses 68 of the bottom wall portion 3. The bottom wall portion 3 of the present embodiment is configured such that a portion on the inner peripheral side with respect to the base formation range 41 is one step higher than the base formation range 41, and is provided in the side wall accommodating recess 68 of the bottom wall portion 3. The lower side portion of the bottom wall reinforcing rib 69 thus formed has the same height as the lower surface of the bottom wall portion 3 in the base formation range 41.

  As described in detail above, according to the present embodiment, when the folding containers 1 in the assembled state are stacked vertically (stacked) in the same direction, the bottom wall on the long side of the upper folding container 1 is stacked. The protrusion 46 is accommodated in the long-side accommodation recess 51 of the lower folding container 1, and the long-side bottom wall projection of the upper folding container 1 is accommodated in the long-side accommodation recess 51. A positioning convex portion 53 that is in contact with or close to the long-side bottom wall protrusion 46 is provided so as to face a surface (inner surface) on the inner peripheral side of the bottom wall portion 3. For this reason, for example, when the long side wall portion 6 of the lower folding container 1 tries to be deformed so as to open to the outside of the folding container 1 due to the weight of the folding container 1 placed on the upper side, The inner surface of the long side bottom wall projection 46 of the folding container 1 and the outer surface (outer surface) of the long side wall 6 of the positioning convex portion 53 come into contact with each other. Accordingly, the long side bottom wall projection 46 of the upper folding container 1 regulates the displacement of the positioning container 53 of the lower folding container 1 to the outside, and thus the deformation of the long side wall 6 to the outside. can do. As a result, it is possible to stabilize the stacked state, and it is possible to improve the transportation / storage efficiency of the folding container 1.

  Moreover, when providing the positioning convex part 53 in the long side accommodation recessed part 51 like this embodiment, in the stacking operation | work of the folding container 1, it is a bottom wall structure with respect to the upper side of the folding container 1 in an assembly state. Slide the stacking container 1 placed relative to the short side direction of the section 2 so that the folding container 1 slides on the upper side of the short side wall 7 of the lower folding container 1 and slide stack. The lower container convex portion inner surface 61 which is the surface on the inner peripheral side of the bottom wall portion 3 in the positioning convex portion 53 of the lower folding container 1 in the assembled state, and the long side bottom wall of the upper folding container 1 There is a concern that the upper container protrusion outer surface 62 which is a surface of the protrusion 46 on the outer peripheral side of the bottom wall 3 comes into contact with the protrusion 46 and further relative displacement is restricted. For this reason, the long side bottom wall protrusion 46 of the upper folding container 1 is slid and accommodated in the long side accommodating recess 51 of the lower folding container 1, that is, the sliding stack of the folding container 1 is not allowed. This may lead to a reduction in stacking workability.

  On the other hand, according to the present embodiment, in the short-side housing recess 52, the tilt is downwardly inclined toward the center in the width direction of the short-side side wall 7, and is continuous with the bottom surface of the short-side housing recess 52. An auxiliary protrusion 54 having a surface 55 is provided. As described above, when the slide stack in the short direction of the bottom wall constituting portion 2 is performed, the short side of the upper folding container 1 with respect to the inclined surface 55 of the auxiliary projection 54 of the lower folding container 1 is used. The side-side bottom wall protrusion 47 abuts, and the short-side bottom wall protrusion 47 and, consequently, the long-side bottom wall protrusion 46 are guided obliquely upward. For this reason, the long side bottom wall protrusion 46 of the upper folding container 1 gets over the positioning convex part 53 of the lower folding container 1 and is accommodated in the long side accommodating recess 51 of the lower folding container 1. It is possible to adopt a configuration that allows a slide stack. Therefore, even in the configuration in which the positioning convex portion 53 is provided in the long-side housing concave portion 51, slide stacking can be performed, and the stacking workability can be improved.

  In particular, in the present embodiment, in the slide stack, the upper side folding wall 46 of the upper folding container 1 and the positioning convex part 53 of the lower folding container 1 come into contact with each other before the upper folding. The short side bottom wall protrusion 47 of the container 1 is in contact with the inclined surface 55 of the auxiliary protrusion 54 of the lower folding container 1 and guided obliquely upward, and the long side bottom wall protrusion of the upper folding container 1 46 without contacting the outer surface 62 of the upper container protrusion 46 and the inner surface 61 of the lower container protrusion 53 of the positioning protrusion 53 of the lower folding container 1. It can be accommodated in the long side accommodation recess 51 of the lower folding container 1. Accordingly, it is possible to more reliably prevent a situation in which the positioning convex portion 53 is damaged during the slide stack.

  Further, the inclined surface 55 of the auxiliary projection 54 needs to be inclined along the traveling direction of the folding container 1 when performing slide stacking. In the present embodiment, the long side bottom wall projection 46 of the upper folding container 1 performs a slide stack such that the positioning convex part 53 provided on the long side wall 6 of the lower folding container 1 gets over. In addition, the inclined surface 55 of the auxiliary protrusion 54 is configured to be inclined along the direction that is the thickness direction of the long side wall portion 6 and the width direction of the short side wall portion 7. Therefore, according to the present embodiment, by providing the auxiliary protrusion 54 on the short side wall portion 7, for example, the auxiliary protrusion 54 is provided on the long side wall portion 6, and the inclined surface 55 of the auxiliary protrusion 54 is set to the long side. Compared to the case where the side wall portion 6 is inclined in the thickness direction, it is possible to ensure a longer distance required to climb the inclined surface 55 of the auxiliary protrusion 54 without increasing the protrusion length of the auxiliary protrusion 54. Become. Therefore, for example, even if the auxiliary protrusion 54 for allowing the positioning convex portion 53 provided on the long side wall portion 6 to get over the long side bottom wall protrusion 46 is provided on the long side wall portion 6, the long side When the side wall portion 6 is relatively thin, the inclined surface 55 of the auxiliary protrusion 54 becomes too steep, and a situation where the guiding effect by the inclined surface 55 of the auxiliary protrusion 54 is not suitably achieved is avoided. Can do.

  Further, the surface of the auxiliary projection 54 opposite to the inclined surface 55 extends in a direction substantially perpendicular to the upper surface of the upper side portion of the short side wall portion 7 provided with the auxiliary projection 54 and has a long side. It is configured as an orthogonal surface 57 that is substantially perpendicular to the bottom surface of the side receiving recess 51. For this reason, for example, in the stacked state of the folding containers 1, when a force is applied to the upper folding container 1 in a direction along the lateral width direction of the short side wall part 7, the short side wall part 7. The orthogonal surface 57 of the auxiliary protrusion 54 and the short side bottom wall protrusion 47 provided in a portion located below the short side base 5 can be configured to contact each other. Therefore, the long side bottom wall protrusion 46 is lifted by the short side bottom wall protrusion 47 riding on the auxiliary protrusion 54 from the surface opposite to the inclined surface 55 of the auxiliary protrusion 54, It is possible to more reliably prevent such a situation that the positioning convex portion 53 gets over the long side housing recess 51. As a result, the stacked state can be further stabilized.

  Further, for example, in the stacked state, when the upper folding container 1 is about to be displaced relative to the lower folding container 1 in the horizontal direction, the long side bottom wall projection 46 is positioned by the positioning projection 53. The short side bottom wall protrusion 47 is configured to contact the orthogonal surface 57 of the auxiliary protrusion 54 at the same time as or before the contact with the outer peripheral surface of the bottom wall 3. . For this reason, protection of the positioning convex part 53 etc. can be aimed at.

  In addition, for the convenience of forming the accommodation recessed parts 51 and 52 in the upper side part of the side wall parts 6 and 7, the area which receives the support rib 42 outer peripheral surface (outer surface of the outer peripheral rib 43) of the upper folding container 1 in a stacked state reduces. In addition, in order to enable slide stacking, the short-side housing recess 52 is made wider than the short-side bottom wall projection 47 (in the lateral width direction of the short-side side wall 7, It is necessary to configure the inside of the short side housing recess 52 so that the short side bottom wall projection 47 can slide. For this reason, there is a concern that the effect of preventing the horizontal displacement of the folding containers 1 in the stacked state may be lowered, and in particular, the long side bottom wall protrusion 46 is provided as close as possible to the corner of the bottom wall 3. In some cases, such concerns become more pronounced. In this regard, as described above, even in the orthogonal surface 57 of the auxiliary protrusion 54, such a problem can be prevented by adopting a configuration that prevents the positional shift of the short-side bottom wall protrusion 47.

  In addition, the bottom wall protrusion 45 is provided not only in a portion of the base formation range 41 that is positioned below the long side base portion 4 but also in a portion that is positioned below the short side base portion 5. Thus, the effect of increasing the rigidity of the base formation range 41 by providing the bottom wall protrusion 45 is exerted over the entire area of the base formation range 41.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the above-described embodiment, the positioning convex portion 53 is provided for the long-side housing concave portion 51 formed in the long-side side wall portion 6. For example, as shown in FIG. You may comprise so that the positioning convex part 81 may also be provided also in the short side accommodation recessed part 52 formed in the short side wall part 7. FIG. Further, in the case of adopting such a configuration, an auxiliary having an inclined surface 83 that is inclined downward toward the lateral side central portion of the long side wall 6 with respect to the long side housing recess 51 of the long side wall 6. It is desirable to provide the protrusion 82. In this case, deformation that opens to the outside of the short side wall portion 7 can be prevented, and even if a configuration in which the positioning convex portion 81 is provided in the short side accommodation recess 52 is adopted, Slide stacking along the longitudinal direction can be performed.

  In addition, when providing the positioning convex part 81 in the short side wall part 7, the positioning convex part 53 of the long side wall part 6 is good also as abbreviate | omitting. However, since the longer side wall 6 has a wider width than the shorter side wall 7, there is a concern that the vicinity of the central portion in the width direction and the like is relatively easily deformed. It is desirable to provide the positioning convex portion 53 corresponding to the above.

  (B) In the said embodiment, when the auxiliary protrusion 54 which has the inclined surface 55 is provided, when carrying out the slide stack of the folding containers 1 in an assembly state, the inner surface of the positioning convex part 53 of the lower folding container 1 The bottom wall projection of the upper folding container 1 is avoided so as to avoid contact between the (lower container convex portion inner surface 61) and the outer surface (upper container projection outer surface 62) of the bottom wall projection 45 of the upper folding container 1. The part 45 is configured to get over the positioning convex part 53 of the lower folding container 1, but the configuration related to the getting-over is not particularly limited.

  For example, as shown in FIG. 13, of the bottom wall projection 45, the outer surface (one inner surface 61) of the positioning container 53 of the lower folding container 1 that can face the inner surface (lower container convex part inner surface 61) of the lower folding container 1. Part) may be the inclined surface 85. In this case, during slide stacking, the inner surface of the positioning convex portion 53 of the lower folding container 1 (lower container convex portion inner surface 61) and the outer surface of the bottom wall projection 45 of the upper folding container 1 (upper container projecting portion outer surface 62). ) Can be avoided even if the slide stack is restricted. In addition, when the configuration in which the inclined surface 85 is provided on the outer surface of the bottom wall protrusion 45, the auxiliary protrusion 54 can be omitted. The inclined surface 85 of the bottom wall protrusion 45 constitutes a climbing guide means.

  (C) Furthermore, the positioning convex portion 53 is provided at a position displaced outward from the inner surface of the long side wall portion 6, and the positioning convex portion 53 is positioned on the inner surface (lower container convex portion inner surface 61) side of the positioning convex portion 53. It is good also as providing the guide rib etc. which have the inclined surface which inclines below toward the inner surface side of the long side wall part 6 from the upper side part of the part 53. In addition, an inclined surface or a curved surface (for example, a corner radius R of about 0.5 mm or so) that the portion from the inner surface to the upper surface of the positioning convex portion 53 is inclined outward (outer surface side of the long side wall portion 6) upward. ). Even in these cases, during the slide stack, the vertical inner surface (lower container convex portion inner surface 61) of the positioning convex portion 53 of the lower folding container 1 and the outer surface (upper surface) of the bottom wall projecting portion 45 of the upper folding container 1 are used. It is possible to avoid such a situation that the outer surface 62) of the container protrudes and the slide stack is restricted. In addition, when the configuration is employed, the auxiliary protrusion 54 can be omitted. The guide rib constitutes a climbing guide means.

  (D) In addition, in the above-described embodiment, instead of the configuration in which the inclined surface 55 is formed on the auxiliary protrusion 54, a surface that contacts the auxiliary protrusion 54 during the slide stack is formed as an inclined surface with respect to the bottom wall protrusion 45. You may comprise.

  (E) In the above embodiment, the lower side portion of the support rib 42 and the lower end portion of the bottom wall projection 45 (projection body 48) are at the same height, and the bottom wall projection 45 is the support rib 42. For example, the bottom wall protrusion 45 is configured such that the lower end of the bottom wall protrusion 45 is positioned above the lower side of the support rib 42, or the bottom wall protrusion 45 is not connected to the support rib 42. May be. However, by connecting the bottom wall protrusion 45 to the support rib 42, the effect of increasing the rigidity of the bottom wall 3 in the base formation range 41 is more reliably achieved, and the bottom wall protrusion 45 is supported by the support rib 42. By adopting a configuration in which it is grounded together with 42, the effect of preventing deformation or the like of the base formation range 41 is further exhibited.

  (F) Furthermore, in the said embodiment, although it is actualized in the folding container 1 in which pinhole stacking is possible, it is also possible to apply to the folding container which can be stacked only in the same direction. In addition, in the above embodiment, a bottom wall protrusion 45 (for reinforcement) that is not locked to the positioning convex portion 53 may be provided. Moreover, in the said embodiment, although the bottom wall part 3 is comprised by the substantially rectangular shape which has a long side part and a short side part, you may be comprised by planar view substantially square shape.

  (G) In the said embodiment, the protrusion length from the bottom wall part 3 of the long side base part 4 is longer than the protrusion length from the bottom wall part 3 of the short side base part 5, and the folding state of the folding container 1 is carried out. The short side wall portion 7 is configured to be folded below the long side wall portion 6, but the protruding length of the short side base portion 5 is lengthened to shorten the short side wall portion. You may comprise so that 7 may be folded up the long side side wall part 6. FIG.

  (H) In the above embodiment, the folding container 1 is made of polypropylene, but 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 side base part, 5 ... Short side side base part, 6 ... Long side side wall part, 7 ... Short side wall part, 41: Base formation range, 42: Support rib, 45 ... Bottom wall projection, 46 ... Long side bottom wall projection, 47 ... Short side bottom wall projection, 51 ... Long side accommodation recess, 52 ... Short side Side accommodating recess, 53 ... positioning protrusion, 54 ... auxiliary protrusion, 55 ... inclined surface, 57 ... orthogonal surface, 61 ... inner surface of lower container protrusion, 62 ... outer surface of upper container protrusion.

Claims (2)

A bottom wall portion having a substantially rectangular plate shape, a base portion protruding upward along each side portion of the bottom wall portion, and a base on which the base portion is formed on the upper surface side of the bottom wall portion A bottom wall constituting portion comprising a support rib projecting downward from the lower surface of the inner peripheral side of the formation range;
A side wall portion pivotably connected between a standing position standing above the base portion and a laying position folded above the bottom wall portion with respect to each base portion. In the folding container,
A bottom wall protrusion that protrudes downward from the bottom surface of the bottom wall in the base formation range;
When the folding containers in the assembled state in which all the side wall portions are in the upright position are stacked one above the other at the upper side portion of the side wall portions, the folding is superimposed on the upper side. And a housing recess for housing the bottom wall protrusion of the container,
When the folding containers provided in the housing recess and stacked in the assembled state are vertically stacked, the bottom wall protrusion of the upper folding container faces the inner wall side of the bottom wall portion, A positioning convex part that abuts or approaches the wall protrusion,
Of the positioning convex portion of the lower folding container in the assembled state, the inner surface of the lower container convex portion that is the surface on the inner peripheral side of the bottom wall portion, and the bottom wall portion of the bottom wall protrusion of the upper folding container. From the state where the folded containers are stacked one above the other so as to face the outer surface of the upper container projecting portion which is the outer peripheral surface,
When the upper and lower folding containers are relatively moved in the horizontal direction so that the inner surface of the lower container convex portion and the outer surface of the upper container protrusion are close to each other, the bottom wall protrusion of the upper folding container is A climbing guide means that is displaced obliquely upward with respect to the positioning convex part of the folding container on the side ,
The base portion connects the pair of first base portions provided along a pair of opposite side portions of the bottom wall portion and both ends of the pair of first base portions, respectively. A pair of second base parts provided along the side part of the bottom wall part,
The side wall includes a pair of opposing first side walls connected to the first base and a pair of opposing second side walls connected to the second base.
The bottom wall protrusion is provided in a part located below the first base part and a part located below the second base part in the base forming range,
The housing recess is provided in the first side wall and the second side wall,
The positioning convex part is provided on at least the first side wall part of the first side wall part and the second side wall part,
Among the first side wall and the second side wall, at least the storage recess of the second side wall is inclined downward toward the lateral center of the second side wall, and the storage recess An auxiliary projection as the overpass guide having an inclined surface continuous with the bottom surface of
In the lower container convex part inner surface of the positioning convex part provided on the first side wall part of the lower folding container in the assembled state, and at a part located below the first base part of the upper folding container From the state where the folded containers are stacked one above the other in the same direction, so as to face the outer surface of the upper container protrusion of the bottom wall protrusion provided.
In the case where the upper and lower folding containers are relatively moved in the horizontal direction so that the inner surface of the lower container protrusion and the outer surface of the upper container protrusion are brought close to each other,
The said provided in the site | part located under the said 2nd base part of an upper folding container with respect to the said inclined surface of the said auxiliary | assistant protrusion provided in the said accommodation recessed part of the said 2nd side wall part of a lower folding container. A folding container, wherein a bottom wall protrusion abuts and is guided obliquely upward . The surface of the auxiliary projection opposite to the inclined surface is configured as an orthogonal surface extending in a direction orthogonal to or near a direction perpendicular to the upper surface of the upper side portion of the side wall portion on which the auxiliary protrusion is provided. The folding container according to claim 1 , wherein the folding container is provided.

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