container

Abstract

The present invention provides a container that can be folded and slide-stacked, and that can stabilize the stacked state of the containers. [Solution] The container 1 comprises a support portion that contacts the installation surface, a long-side bottom wall locking portion 25a that protrudes downward from a long-side outer peripheral corresponding portion 24a supported by the long-side side wall portion 6 of the lower container 1 when the assembled containers 1 are stacked, a long-side wall locking portion 21 that is inserted between the long-side bottom wall locking portion 25a and the support portion of the upper container 1 when the containers 1 are slid and stacked in their longitudinal direction, a long-side slide assist projection 26a that abuts against the upper surface of the long-side wall locking portion 21 of the lower container 1 when the containers 1 are slid and stacked in their longitudinal direction, and a long-side locking restricting portion 33 and a long-side slide restricting portion 34 that approach or abut against the long-side bottom wall locking portion 25a housed in the long-side locking receiving portion 31 and the long-side slide assist projection 26a housed in the long-side slide receiving portion 32, respectively, in the longitudinal direction of the container 1.

Description

Technical Field

[0001] The present invention relates to a container capable of accommodating an article.

Background Art

[0002] Conventionally, there is known a container including a bottom wall component having a substantially rectangular shape in plan view, and side wall components each connected to each side edge portion of the bottom wall component so as to be rotatable and displaceable. The side wall components are configured to be rotatable and displaceable between a standing posture in which they stand above each side edge portion of the bottom wall component and a folded posture in which they are laid down on the central portion side of the bottom wall component. Also, in the operation of stacking (stacking in tiers) containers in an assembled state in which all side wall components are in the standing posture, when placing the upper container on the lower container, the upper container is first placed in a state where it is horizontally displaced with respect to the lower container, and then the upper container is slid (slide stacked) so as to eliminate the displacement. In this regard, there is a technique having a configuration for preventing the upper container from falling off the lower container during slide stacking (for example, see Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a container that can be folded and can perform slide stacking in an assembled state, it is desired to further stabilize the state in which the containers are stacked on top of each other.

[0005] The present invention has been made to solve the above-exemplified problems and the like, and an object thereof is to provide a container that can be folded and can perform slide stacking, and can stabilize the state in which the containers are stacked on top of each other. [Means for solving the problem]

[0006] The following sections will describe each means suitable for achieving the above objectives. Additionally, specific effects and benefits of each means will be noted as needed.

[0007] Means 1. A container comprising a bottom wall component having a substantially rectangular shape in plan view, first side wall components rotatably connected to a pair of opposing first side edges of the bottom wall component, and second side wall components rotatably connected to a pair of opposing second side edges of the bottom wall component, The first side wall portion and the second side wall portion are configured to be rotatably displaceable between an upright position in which they are erected above each side portion of the bottom wall component and a folded position in which they are tilted toward the central portion of the bottom wall component. The container is configured to be able to change between an assembled state in which all of the side walls are in the upright position and a folded state in which all of the side walls are in the folded position. The containers are configured to be stacked on top of each other in the assembled state, The bottom wall component comprises an outer peripheral corresponding portion that, when the assembled containers are stacked, is supported by the upper edge of the side wall portion of the lower container and faces the upper surface of the upper edge of the side wall portion of the lower container; a support portion that protrudes downward from a portion on the inner circumference side of the outer peripheral corresponding portion and below the outer peripheral corresponding portion; and a bottom wall side locking portion that protrudes downward from the outer peripheral corresponding portion such that a gap is formed between it and the support portion. The side wall portion includes a side wall locking portion that is inserted into the gap between the bottom wall locking portion of the upper container and the support portion when the containers are stacked in the assembled state. The bottom wall component is provided with a sliding auxiliary projection that protrudes downward from the outer peripheral corresponding portion. The bottom wall side locking portion includes a first bottom wall side locking portion that protrudes downward from the first outer peripheral corresponding portion that extends along the first side portion of the outer peripheral corresponding portion, The slide assist projection comprises a first slide assist projection that protrudes downward from the first outer peripheral corresponding portion, In a state where the upper container is placed on the lower container in the assembled state with a position offset in the lateral direction of the first side wall, the first sliding auxiliary projection of the upper container is configured to abut against the upper surface of the side wall locking portion corresponding to the first side wall of the lower container. The first side wall portion includes a first receiving portion that accommodates the first bottom wall locking portion of the upper container when the assembled containers are stacked together, and a second receiving portion (provided in the side wall locking portion) that accommodates the first sliding auxiliary projection of the upper container. The first receiving portion is provided with a first restricting portion that faces the first bottom wall side locking portion housed in the first receiving portion in the lateral width direction of the first side wall portion, The container is characterized in that the second receiving portion is provided with a second restricting portion that faces the first slide auxiliary projection housed in the second receiving portion in the lateral width direction of the first side wall.

[0008] According to means 1, the first slide assist projection protrudes downward from the first outer peripheral corresponding portion, and when stacking (stacking) assembled containers, when the upper container is placed on the lower container with a position offset in the width direction of the first side wall portion, and the upper container is slid to eliminate the position offset and stack them (slide stack in the width direction of the first side wall portion), even if the first slide assist projection is provided at a position separated from the edge on the second side side portion of the bottom wall component, the first slide assist projection of the upper container can be reliably brought into contact (sliding contact) with the upper surface of the side wall locking portion of the lower container. Therefore, for example, the first slide assist projection can be provided in the lateral width direction of the first side wall within or near the range of at least one of the formation range of the support portion and the formation range of the first bottom wall side locking portion, and when the assembled containers are slid and stacked in the lateral width direction of the first side wall, the side wall side locking portion of the lower container is guided by at least one of the first bottom wall side locking portion and support portion of the upper container (in some cases, the side wall side locking portion of the lower container is relatively inserted between the first bottom wall side locking portion and the support portion of the upper container), thereby preventing the first slide assist projection of the upper container from falling off the upper surface of the side wall side locking portion of the lower container. Therefore, when stacking assembled containers in the lateral direction of the first side wall, compared to, for example, when the edge of the second side of the bottom wall component abuts (slides) against the upper surface of the side wall locking portion of the lower container, lateral displacement of the upper and lower containers relative to the direction of travel can be prevented more reliably, and the sliding stacking can be performed more smoothly.

[0009] Furthermore, when assembled containers are stacked on top of each other (stacked state), the first bottom wall locking portion of the upper container is housed in the first receiving portion of the lower container, and the first sliding auxiliary projection of the upper container is housed in the second receiving portion of the lower container. Therefore, in the stacked state of assembled containers, the outer circumference of the upper container can be reliably supported by the side wall locking portion of the lower container without interference from the first bottom wall locking portion and the first sliding auxiliary projection. As a result, the side wall locking portion of the lower container is inserted relatively deeply between the first bottom wall locking portion and the support portion of the upper container, allowing the side wall locking portion of the lower container to efficiently engage with the first bottom wall locking portion and support portion of the upper container. Consequently, relative displacement of the upper and lower containers in the lateral direction of the second side wall can be prevented more reliably.

[0010] Furthermore, in the stacked state of the assembled containers, the first bottom wall locking portion and the first slide auxiliary projection of the upper container are configured to face the first restricting portion of the first receiving portion and the second restricting portion of the second receiving portion of the lower container in the lateral direction of the first side wall. As a result, when a force acts on the stacked containers in the assembled state that causes relative displacement between the upper and lower containers in the lateral direction of the first side wall, the first bottom wall locking portion and the first slide auxiliary projection of the upper container come into contact with the first restricting portion and the second restricting portion of the lower container, thereby more reliably preventing relative displacement between the upper and lower containers in the lateral direction of the first side wall. Consequently, the stacked state of the containers can be stabilized. In addition, by providing not only a second restricting portion but also a first restricting portion, for example, when restricting the relative displacement in the lateral direction of the first side walls of upper and lower containers in a stacked state, the first slide auxiliary projection can not only contact the second restricting portion but also the first bottom wall side locking portion can contact the first restricting portion, thereby preventing damage to the first slide auxiliary projection.

[0011] Means 2. The container according to Means 1, characterized in that the lower edge of the predetermined slide assist projection is located above the outer peripheral portion of the bottom wall component than the inner peripheral portion of the bottom wall component.

[0012] According to method 2, it is possible to prevent the slide assist protrusions from getting caught on the sides of the conveying line when the container is being conveyed on the conveying line, or from the slide assist protrusions coming into contact with the installation surface when the container is placed on an installation surface such as the floor or the top surface of a pallet due to the container being in an angled position. Therefore, it is possible to prevent damage to the slide assist protrusions and improve their durability. Furthermore, when a configuration is adopted in which the slide assist protrusions are connected to the support part, the inner circumference portion of the bottom wall component of the slide assist protrusions that is connected to the support part protrudes further downward, thus reinforcing the area around the portion of the support part that is connected to the slide assist protrusions.

[0013] Means 3. The container according to means 1 or 2, characterized in that the first receiving portion and the second receiving portion overlap in at least a portion of the forming range in the lateral direction of the first side wall portion and are continuous in the inward-outward direction of the container (thickness direction of the first side wall portion).

[0014] According to method 3, when removing an upper container from a stacked assembled container by sliding it in the lateral direction of the first side wall relative to the lower container (unstacking the stacks), the worker slightly lifts and pulls the second side wall on the near side, allowing the first bottom wall locking part and the first slide assist projection to disengage from the first and second receiving parts almost simultaneously or at the closest possible timing (when one disengages, the other disengages as well). Therefore, the workability when unstacking the stacks of containers can be improved. Furthermore, by making the first receiving part and the second receiving part a continuous shape, the first slide assist projection and the first bottom wall locking part can be connected, thereby mutually increasing the strength and rigidity of the first slide assist projection and the first bottom wall locking part. Therefore, stability can be improved during the slide stacking operation of assembled containers and in the stacked state of assembled containers.

[0015] Means 4. The slide assist projection is connected to the support portion and the bottom wall side locking portion, The container according to means 3, characterized in that the portion where the first receiving portion and the second receiving portion are continuous in the inward-outward direction of the container (in the thickness direction of the first side wall portion) penetrates the first side wall portion in the inward-outward direction of the container.

[0016] According to method 4, the slide assist projection, the support portion, and the bottom wall side locking portion are connected to each other, thereby mutually increasing the strength and rigidity of the slide assist projection, the support portion, and the bottom wall side locking portion. Therefore, stability can be further improved during the slide stacking operation of assembled containers and when assembled containers are stacked. Furthermore, since the slide assist projection is provided in a position sandwiched between the support portion and the bottom wall side locking portion, when assembled containers are slide stacked in the lateral direction of the first side wall, the side wall side locking portion of the lower container is guided by both the first bottom wall side locking portion and the support portion of the upper container, thereby more reliably preventing the first slide assist projection of the upper container from falling off the upper surface of the side wall side locking portion of the lower container. Therefore, slide stacking can be performed more smoothly. Furthermore, as the slide assist projection is connected to the support portion and the bottom wall side locking portion, the side wall side locking portion, which is inserted into the gap between the support portion and the bottom wall side locking portion, needs to have a recess (second receiving portion) that receives the slide assist projection of the upper container when the assembled containers are stacked. However, since the side wall side locking portion is on the upper edge of the side wall, it is desirable to make it as small as possible, and therefore, it is desirable not to make the width of the slide assist projection unnecessarily wide. In this regard, as in the above-described means 1, when the relative displacement of the upper and lower containers in the lateral direction of the first side wall is restricted when the assembled containers are stacked, if the first slide assist projection of the upper container comes into contact with the second restricting portion of the lower container, the first bottom wall side locking portion of the upper container is also configured to come into contact with the first restricting portion of the lower container, thereby reducing the burden on the first slide assist projection when the relative displacement of the upper and lower containers in the lateral direction of the first side wall is restricted when the assembled containers are stacked. As a result, it is possible to improve the durability of the first slide auxiliary projection while suppressing the reduction in strength of the side wall locking portion caused by the formation of the second receiving portion.

[0017] Means 5. The lower end of the slide assist projection is located above the lower end of the support portion. The lower end of the predetermined bottom wall side locking portion is at the same position in the vertical direction as the lower end of the slide assisting projection, or the lower end of the bottom wall side locking portion is located above the lower end of the slide assisting projection, which is the container according to means 1 or 2.

[0018] According to means 5, when the support portion touches the installation surface by installing the container on the installation surface, the slide assisting projection and the predetermined bottom wall side locking portion are separated (floating) upward from the installation surface. Therefore, damage to the slide assisting projection and the predetermined bottom wall side locking portion can be suppressed. Further, at the portion of the side wall side locking portion that abuts against the slide assisting projection during slide stacking, since the side surface faces the support portion, the slide stacking of the container is guided more stably.

Brief Description of Drawings

[0019] [Figure 1] It is a perspective view showing the upper surface side of the container in the assembled state. [Figure 2] It is a partially enlarged perspective view showing the side wall portion etc. of the container in the assembled state. [Figure 3] It is a partially enlarged perspective view showing the side wall portion of the container in the assembled state. [Figure 4] It is a perspective view showing the lower surface side of the container in the assembled state. [Figure 5] It is a partially enlarged perspective view showing the bottom wall component etc. of the container in the assembled state. [Figure 6] It is a partially enlarged perspective view showing the bottom wall component. [Figure 7] It is a perspective view showing the container in the assembled state in the stacked state. [Figure 8] It is a partially enlarged perspective view showing the container in the assembled state in the stacked state. [Figure 9] It is a partially enlarged side view showing the long side of the container in the assembled state in the stacked state. [Figure 10] It is a partially enlarged cross-sectional view showing the long side of the container in the assembled state in the stacked state. [Figure 11]This is a partially enlarged side view showing the short side of a stacked container in an assembled state. [Figure 12] This is a partially enlarged side view showing the shorter side of a container when the upper container is slightly lifted above the lower container in a stacked container assembly. [Figure 13] This is a perspective view showing how assembled containers can be slid and stacked in the longitudinal direction. [Figure 14] This is a partially enlarged perspective view showing how assembled containers can be slid and stacked in the longitudinal direction. [Figure 15] This is a perspective view showing how assembled containers can be slid and stacked in the shorter width direction. [Figure 16] This is a partially enlarged perspective view showing how assembled containers can be slid and stacked in the shorter width direction. [Figure 17] This is a perspective view showing a container in a folded state. [Figure 18] This is a partially enlarged perspective view showing a container in a folded state. [Figure 19] This is a perspective view showing a stacked and folded container. [Modes for carrying out the invention]

[0020] An embodiment will be described below with reference to the drawings. As shown in Figures 1, 4, etc., the container 1 has a bottom wall component 2 comprising a bottom wall portion 3 which is substantially rectangular in plan view, long-side base portions 4 which project upward from the bottom wall portion 3 along each long side portion (first side portion) of the bottom wall portion 3, and short-side base portions 5 which project upward from the bottom wall portion 3 along each short side portion (second side portion) of the bottom wall portion 3. Furthermore, the container 1 has long-side side wall portions 6 which are first side wall portions that are rotatably connected to each long-side base portion 4, and short-side side wall portions 7 which are second side wall portions that are rotatably connected to each short-side base portion 5.

[0021] The long-side wall portion 6 and the short-side wall portion 7 are configured to be rotatably displaceable between an upright position, where they are erected above the long-side base portion 4 and the short-side base portion 5, and a folded position, where they are tilted towards the center of the bottom wall component 2 (bottom wall portion 3) (see Figure 17). When storing items in the container 1, all the long-side wall portions 6 and the short-side wall portions 7 are in the upright position in the assembled state. When retrieving or storing the container 1, all the long-side wall portions 6 and the short-side wall portions 7 can be folded to save space, etc. The bottom wall component 2, the long-side wall portion 6, and the short-side wall portion 7 in this embodiment are made of polypropylene.

[0022] Furthermore, as shown in Figures 1 and 17, the protrusion length of the long-side base portion 4 from the bottom wall portion 3 is longer than the protrusion length of the short-side base portion 5 from the bottom wall portion 3, and the formation position of the long-side bearing portion 8 for rotatably supporting the long-side side wall portion 6 is located above the formation position of the short-side bearing portion 9 for rotatably supporting the short-side side wall portion 7. In addition, the width of the long-side side wall portion 6 is configured to be approximately the same as the longitudinal width of the bottom wall component portion 2, and the width of the short-side side wall portion 7 is configured to be approximately the same as the distance between the pair of long-side base portions 4. For this reason, in this embodiment, when folding the assembled container 1, the pair of short-side side wall portions 7 are first folded, and then the pair of long-side side wall portions 6 are placed on top of the short-side side wall portions 7 to displace them into the folded position.

[0023] As shown in Figure 1, the long side wall portion 6 is provided with a long side hinge portion 11 that is rotatably connected to the long side bearing portion 8 of the long side base portion 4. Furthermore, the short side wall portion 7 is provided with a short side hinge portion 12 that is rotatably connected to the short side bearing portion 9 of the short side base portion 5. Also, as shown in Figures 1 and 2, the long side wall portion 6 is provided with locking walls 13 that protrude inward from both sides of the inner surface. The locking walls 13 are provided with locking holes 14 that penetrate the long side wall portion 6 in the lateral direction. In contrast, both sides of the outer surface of the short side wall portion 7 are provided with locking portions 15 that abut against the locking walls 13 when the container 1 is assembled, and the locking portions 15 are provided with locking projections 16 that protrude outward from the outer surface of the short side wall portion 7 and are inserted into and locked into the locking holes 14 when the container 1 is assembled. This configuration prevents the short-side side wall portion 7 and the long-side side wall portion 6 from tilting outward from the container 1, and also prevents vertical displacement between the long-side side wall portion 6 and the short-side side wall portion 7.

[0024] Furthermore, as shown in Figure 1, a locking mechanism 17 is provided on the outer surface of the short-side wall portion 7 to prevent the short-side wall portion 7 from tilting inward towards the container 1. The locking mechanism 17 comprises a pair of left and right sliding pieces 18. The sliding pieces 18 are configured to be displaceable between a locked position, in which they are inserted into a substantially cylindrical locking portion (not shown) provided on the locking wall 13 and locked, and a released position, in which the locked state is released, when the container 1 is assembled, and are biased toward the locked position. In addition, the locking mechanism 17 is equipped with an operating part 19 that can be operated by an operator, and by performing a predetermined operation of the operating part 19, the pair of left and right sliding pieces 18 are displaced from the locked position to the released position.

[0025] As shown in Figures 1 and 2, each long side wall portion 6 is provided with a long side wall locking portion 21 that protrudes upward from the inner portion of the long side wall portion 6 (the inner portion of the container 1) on the upper side of the long side wall portion 6 and extends along the width direction of the long side wall portion 6. In this embodiment, the long side wall locking portion 21 is provided over the entire width direction of the long side wall portion 6.

[0026] Furthermore, each short-side wall portion 7 is provided with a short-side locking portion 22 that protrudes upward from the inner portion of the short-side wall portion 7 (the inner portion of the container 1) on the upper edge of the short-side wall portion 7 and extends along the width direction of the short-side wall portion 7. In this embodiment, the short-side locking portion 22 is provided over the entire width direction of the short-side wall portion 7. In addition, the upper surface of the long-side locking portion 21 and the upper surface of the short-side locking portion 22 are at the same height. Note that the upper surface of the general portion of the upper edge of the long-side wall portion 6 other than the long-side locking portion 21 is at the same height as the upper surface of the general portion of the upper edge of the short-side wall portion 7 other than the short-side locking portion 22.

[0027] Furthermore, as shown in Figures 4 and 5, the bottom wall component 2 has a support portion 23 that protrudes downward from the bottom wall portion 3 and makes contact with the ground when the container 1 is placed on an installation surface such as a floor. In this embodiment, as shown in Figure 7, the containers 1 in their assembled state can be stacked on top of each other. As shown in Figures 4 and 5, the support portion 23 protrudes downward from the inner circumference of the bottom wall component 2, which is the part of the bottom wall portion 3 that is supported by the upper surface of the long side side wall portion 6 and the short side side wall portion 7 of the lower container 1 when the assembled containers 1 are stacked.

[0028] In the stacked state of the assembled containers 1, the outer peripheral portion 24 of the upper container 1 is supported by contacting the upper surfaces of the long side wall locking portion 21 and the short side wall locking portion 22 of the lower container 1 (see Figures 10 and 11), and the support portion 23 of the upper container 1 is inserted into the inner side (storage space) of the lower container 1 and is configured to contact or be close to the inner surfaces of the long side wall portion 6 and the short side wall portion 7 (long side wall locking portion 21 and short side wall locking portion 22).

[0029] Furthermore, as shown in Figures 5 and 6, the bottom wall component 2 is provided with a bottom wall-side locking portion 25 that protrudes downward from the outer peripheral corresponding portion 24 such that a gap is formed between it and the support portion 23. The bottom wall-side locking portion 25 includes a long-side bottom wall locking portion 25a, which is a first bottom wall-side locking portion that protrudes downward from the long-side outer peripheral corresponding portion 24a (first outer peripheral corresponding portion) which extends along the long side of the outer peripheral corresponding portion 24 (located below the long-side base portion 4), and a short-side bottom wall locking portion 25b, which protrudes downward from the short-side outer peripheral corresponding portion 24b (second outer peripheral corresponding portion) which extends along the short side of the outer peripheral corresponding portion 24 (located below the short-side base portion 5). The lower end of the bottom wall-side locking portion 25 is located above the lower end of the support portion 23. In the stacked state of the assembled container 1, the long side wall locking portion 21 and the short side wall locking portion 22 of the lower container 1 are configured to be inserted into the gap between the bottom wall locking portion 25 (long side bottom wall locking portion 25a and short side bottom wall locking portion 25b) of the upper container 1 and the support portion 23, respectively.

[0030] In addition, as shown in Figures 5 and 6, the bottom wall component 2 is provided with slide assist protrusions 26 that protrude downward from the outer peripheral corresponding portion 24. The slide assist protrusions 26 consist of a long-side slide assist protrusion 26a, which is a first slide assist protrusion that protrudes downward from the long-side outer peripheral corresponding portion 24a, and a short-side slide assist protrusion 26b that protrudes downward from the short-side outer peripheral corresponding portion 24b. The long-side slide assist protrusion 26a and the short-side slide assist protrusion 26b are provided so as to connect a part of the support portion 23 and a part of the bottom wall locking portion 25 (long-side bottom wall locking portion 25a and short-side bottom wall locking portion 25b) near each corner of the bottom wall component 2 (at a position that is spaced away from the corner but close to the corner). In other words, the long-side sliding auxiliary projection 26a is provided within the formation range of the support portion 23 and the formation range of the long-side bottom wall locking portion 25a in the lateral width direction of the long-side side wall portion 6 (the longitudinal width direction of the container 1), and the width of the long-side sliding auxiliary projection 26a in the longitudinal width direction of the container 1 is narrower than the formation range of the support portion 23 and the formation range of the long-side bottom wall locking portion 25a connected to the long-side sliding auxiliary projection 26a. Furthermore, the short-side sliding auxiliary projection 26b is provided within the formation range of the support portion 23 and the formation range of the short-side bottom wall locking portion 25b in the lateral width direction of the short-side side wall portion 7 (the short-side width direction of the container 1), and the width of the short-side sliding auxiliary projection 26b in the short-side width direction of the container 1 is narrower than the formation range of the support portion 23 and the formation range of the short-side bottom wall locking portion 25b connected to the short-side sliding auxiliary projection 26b. In addition, the long-side sliding auxiliary projection 26a and the short-side sliding auxiliary projection 26b extend in directions perpendicular to the corresponding support portion 23 and bottom wall-side locking portion 25.

[0031] Furthermore, the lower edge of the short-side sliding auxiliary projection 26b is positioned such that the portion on the outer circumference side (centrifugal side of the bottom wall component 2) is higher than the portion on the inner circumference side (center side of the bottom wall component 2) of the bottom wall component 2. In this embodiment, the portion of the lower edge of the short-side sliding auxiliary projection 26b that is on the inner circumference side of the bottom wall component 2 extends substantially horizontally at a position slightly above the lower end of the support portion 23, while the portion on the outer circumference side of the bottom wall component 2 extends in an upward inclination from the inner circumference side toward the outer circumference side of the bottom wall component 2 and is connected to the lower edge of the short-side bottom wall locking portion 25b. In contrast, the lower edge of the long-side sliding auxiliary projection 26a extends substantially horizontally, and in this embodiment, the lower edge of the long-side sliding auxiliary projection 26a is positioned higher than the lower edge of the long-side bottom wall locking portion 25a.

[0032] In addition, as shown in Figure 5, the portion of the support portion 23 connected to the long-side sliding auxiliary projection 26a is provided with a bulge portion 27 that extends from a position slightly above the lower end of the support portion 23 to the upper end, bulging outwards towards the outer circumference of the bottom wall component 2. The lower end of the bulge portion 27 is lower than the lower edge of the long-side sliding auxiliary projection 26a and higher than the lower end of the support portion 23. As a result, the lower edge of the long-side sliding auxiliary projection 26a, the lower end of the bulge portion 27, and the lower end of the support portion 23 are stepped. Furthermore, in the lateral direction of the long-side side wall portion 6, the width of the bulge portion 27 is wider than the width of the long-side sliding auxiliary projection 26a.

[0033] Furthermore, as shown in Figures 5 and 6, the short-side bottom wall locking portion 25b is not provided in the area of ​​the short-side bottom wall portion 3 that overlaps with the formation area of ​​the long-side sliding auxiliary projection 26a in the lateral direction. In addition, of the long-side bottom wall locking portion 25a, the lower edge portion of the area of ​​the long-side bottom wall portion 3 that overlaps with the formation area of ​​the short-side sliding auxiliary projection 26b in the lateral direction is located above the lower edge portion of the short-side sliding auxiliary projection 26b.

[0034] As shown in Figures 13 and 14, when the upper container 1 is placed on the lower container 1 in an assembled state with its position offset in the lateral direction of the long side wall portion 6 (the longitudinal width direction of the container 1) (the upper container 1 protrudes toward the worker relative to the lower container 1), the long side sliding auxiliary projection 26a of the upper container 1 is configured to contact the upper surface of the long side wall side locking portion 21 of the lower container 1. Then, when the upper container 1 is slid to stack (slide stack) to correct the misalignment, the long-side sliding auxiliary projection 26a of the upper container 1 slides against the upper surface of the long-side wall-side locking portion 21 of the lower container 1, and the long-side wall-side locking portion 21 is sandwiched on both sides by the long-side bottom wall locking portion 25a and the support portion 23, thereby guiding the long-side sliding auxiliary projection 26a and the long-side wall-side locking portion 21 to maintain contact (preventing them from falling off).

[0035] Furthermore, as shown in Figures 15 and 16, when the upper container 1 is placed on the lower container 1 in an assembled state with a position offset in the lateral direction of the short side wall portion 7 (the short side width direction of the container 1), the short side slide assist projection 26b of the upper container 1 is configured to contact the upper surface of the short side wall locking portion 22 of the lower container 1. When the upper container 1 is slid and stacked to eliminate the positional misalignment, the short side slide assist projection 26b of the upper container 1 slides against the upper surface of the short side wall locking portion 22 of the lower container 1, and the short side wall locking portion 22 is guided so that the contact between the short side slide assist projection 26b and the short side wall locking portion 22 is maintained (prevents detachment) as the short side wall locking portion 22 is sandwiched on both sides by the short side bottom wall locking portion 25b and the support portion 23. In this example, the lower end of the short-side slide assist projection 26b is located above the lower end of the short-side bottom wall locking portion 25b. When the container 1 slides and stacks in the short-width direction, depending on the angle of the upper container 1 relative to the lower container 1, the short-side wall locking portion 22 of the lower container 1 may be relatively inserted between the portion of the short-side bottom wall locking portion 25b of the upper container 1 that is further forward in the sliding direction than the short-side slide assist projection 26b and the support portion 23, or the short-side wall locking portion 22 of the lower container 1 may be located below the lower end of the short-side bottom wall locking portion 25b of the upper container 1. However, even when the container 1 is slide-stacked in the short-width direction, the upper end of the short-side wall-side locking portion 22 of the lower container 1 is located above the lower edge of the periphery of the short-side slide assist projection 26b of the support portion 23 (outer peripheral rib extending in the short-width direction of the container 1) of the upper container 1, and the slide stack is guided by the support portion 23.

[0036] As shown in Figures 2, 3, and 8, the long-side side wall portion 6 includes a long-side locking receiving portion 31 (see Figure 9) which serves as a first receiving portion that accommodates (accepts the placement of) the long-side bottom wall locking portion 25a of the upper container 1 when the assembled containers 1 are stacked, and a long-side slide receiving portion 32 (see Figure 10) which serves as a second receiving portion that accommodates (accepts the placement of) the long-side slide auxiliary projection 26a of the upper container 1 (provided in the long-side wall locking portion 21). Furthermore, as shown in Figure 2, at least a portion of the forming range of the long-side locking receiving portion 31 and the long-side slide receiving portion 32 overlaps in the lateral direction of the long-side side wall portion 6, and is configured to be continuous in the inward-outward direction of the container 1 (thickness direction of the long-side side wall portion 6). Furthermore, the portion where the long-side locking receiving portion 31 and the long-side sliding receiving portion 32 are continuous in the inward-outward direction of the container 1 (in the thickness direction of the long-side side wall portion 6) is configured to penetrate the long-side side wall portion 6 in the inward-outward direction of the container 1. In addition, as shown in Figure 3, the long-side side wall portion 6 is provided with a bulge receiving portion 39 that accommodates (receives the placement of) the bulge portion 27 of the upper container 1 when the assembled containers 1 are stacked.

[0037] Furthermore, as shown in Figures 2 and 9, the long-side locking receiving portion 31 is provided with a long-side locking restricting portion 33, which is a first restricting portion that faces, approaches, or abuts against the long-side bottom wall locking portion 25a housed in the long-side locking receiving portion 31 in the lateral direction of the long-side side wall portion 6. In addition, as shown in Figures 2 and 10, the long-side slide receiving portion 32 is provided with a long-side slide restricting portion 34, which is a second restricting portion that faces, approaches, or abuts against the long-side slide auxiliary projection 26a housed in the long-side slide receiving portion 32 in the lateral direction of the long-side side wall portion 6.

[0038] Here, as shown in Figure 2, the long-side locking restricting portion 33 defines the area of ​​the long-side side wall portion 6 of the long-side locking receiving portion 31 in the lateral direction, on the side of the lateral direction of the long-side side wall portion 6, and is a wall portion that extends in a substantially vertical direction (located on the outer side of the container 1 of the long-side wall locking portion 21 and extending upward from the upper side of the long-side side wall portion 6). As shown in Figure 9, when the assembled containers 1 are stacked, the long-side locking restricting portion 33 is located on the side of the lateral direction of the long-side bottom wall locking portion 25a of the upper container 1 of the long-side side wall portion 6, on the side of the lateral direction of the long-side locking restricting portion 33. Furthermore, in the stacked state of the assembled containers 1, if a predetermined long-side bottom wall locking portion 25a of the upper container 1 is displaced relative to the lateral central portion of the long-side side wall portion 6 of the lower container 1, the predetermined long-side bottom wall locking portion 25a will come into contact with the long-side locking restricting portion 33, thereby restricting further displacement.

[0039] Furthermore, as shown in Figure 2, the long-side slide restricting portion 34 defines the range (width) of the long-side side wall portion 6 of the long-side slide receiving portion 32 in the lateral direction, and is a wall portion that extends in a substantially vertical direction (formed by notching or recessing the long-side wall locking portion 21). As shown in Figure 10, when the assembled containers 1 are stacked, the long-side slide restricting portions 34 are located on both sides of the long-side slide auxiliary projection 26a of the upper container 1 in the lateral direction of the long-side side wall portion 6. When the assembled containers 1 are stacked, if the containers 1 are displaced relative to each other in the lateral direction of the long-side side wall portion 6, the long-side slide auxiliary projection 26a will come into contact with one or the other long-side slide restricting portion 34, thereby restricting further displacement.

[0040] Furthermore, as shown in Figures 2, 3, 8, 11, and 12, the short-side side wall portion 7 includes a short-side locking receiving portion 35 as a first receiving portion that accommodates (accepts the placement of) the short-side bottom wall locking portion 25b of the upper container 1 when the assembled containers 1 are stacked, and a short-side slide receiving portion 36 as a second receiving portion that accommodates (accepts the placement of) the short-side slide auxiliary projection 26b of the upper container 1 (provided in the short-side wall locking portion 22). Moreover, as shown in Figures 2 and 12, the short-side locking receiving portion 35 and the short-side slide receiving portion 36 overlap in at least a portion of their formation range in the lateral width direction of the short-side side wall portion 7, and are configured to be continuous in the inward-outward direction of the container 1 (thickness direction of the short-side side wall portion 7). In addition, the portion where the short-side locking receiving portion 35 and the short-side sliding receiving portion 36 are continuous in the inward-outward direction of the container 1 (in the thickness direction of the short-side side wall portion 7) is configured to penetrate the short-side side wall portion 7 in the inward-outward direction of the container 1.

[0041] Furthermore, as shown in Figures 2 and 11, the short-side locking receiving portion 35 is provided with a short-side locking restricting portion 37, which is a first restricting portion that faces, approaches, or abuts against the short-side bottom wall locking portion 25b housed in the short-side locking receiving portion 35 in the lateral direction of the short-side side wall portion 7. In addition, as shown in Figures 2 and 12, the short-side slide receiving portion 36 is provided with a short-side slide restricting portion 38, which is a second restricting portion that faces, approaches, or abuts against the short-side slide auxiliary projection 26b housed in the short-side slide receiving portion 36 in the lateral direction of the short-side side wall portion 7.

[0042] Here, as shown in Figure 2, the short-side locking restricting portion 37 defines the area of ​​the short-side side wall portion 7 of the short-side locking receiving portion 35 in the lateral direction, on the side of the center of the short-side side wall portion 7 in the lateral direction, and is a wall portion that extends in a substantially vertical direction (located on the outer side of the container 1 of the short-side wall locking portion 22 and upward from the upper side of the short-side side wall portion 7). As shown in Figure 11, when the assembled containers 1 are stacked, the short-side locking restricting portion 37 is located on the side of the center of the short-side side wall portion 7 in the lateral direction of the short-side bottom wall locking portion 25b of the upper container 1. Furthermore, in the stacked state of the assembled containers 1, if a predetermined short-side bottom wall locking portion 25b of the upper container 1 is displaced relative to the center in the lateral direction of the short-side side wall portion 7 of the lower container 1, the predetermined short-side bottom wall locking portion 25b will come into contact with the short-side locking restricting portion 37, thereby restricting further displacement.

[0043] Furthermore, as shown in Figures 2 and 12, the short-side slide restricting portion 38 defines the range (width) of the short-side side wall portion 7 of the short-side slide receiving portion 36 in the lateral direction, and is a wall portion that extends substantially vertically (formed by notching or recessing the short-side wall locking portion 22). When the assembled containers 1 are stacked, the short-side slide restricting portion 38 is located on the lateral side of the center of the short-side side wall portion 7 of the upper container 1, relative to the short-side slide auxiliary projection 26b of the upper container 1 in the lateral direction of the short-side side wall portion 7. When the assembled containers 1 are stacked, if a predetermined short-side slide auxiliary projection 26b of the upper container 1 is displaced relative to the center of the short-side side wall portion 7 of the lower container 1, the predetermined short-side slide auxiliary projection 26b comes into contact with the short-side slide restricting portion 38, thereby restricting further displacement.

[0044] In this embodiment, when the long-side slide auxiliary projection 26a comes into contact with the long-side slide restricting portion 34, a predetermined long-side bottom wall locking portion 25a comes into contact with the long-side locking restricting portion 33 (they come into contact simultaneously, or the predetermined long-side bottom wall locking portion 25a comes into contact with the long-side locking restricting portion 33 first). Furthermore, when the short-side slide auxiliary projection 26b comes into contact with the short-side slide restricting portion 38, a predetermined short-side bottom wall locking portion 25b comes into contact with the short-side locking restricting portion 37 (they come into contact simultaneously, or the predetermined short-side bottom wall locking portion 25b comes into contact with the short-side locking restricting portion 37 first). In addition, when the long-side sliding auxiliary projection 26a comes into contact with the long-side sliding restricting portion 34, the bulge portion 27 is configured to come into contact with the inner surface of the long-side side wall portion 6 of the bulge portion receiving portion 39 that defines the formation range in the lateral direction. In this embodiment, the bulge portion receiving portion 39 is not configured (shaped) to restrict the relative displacement of the bulge portion 27 housed in the bulge portion receiving portion 39 in the longitudinal direction of the container 1, but it may be configured to do so. Furthermore, in the above-mentioned situations of "simultaneous contact" or "at an earlier timing," with respect to the longitudinal displacement of the stacked containers 1 in the assembled state, the support portion 23 of the upper container 1 may come into contact with the inner surface of the short-side side wall portion 7 of the lower container 1, or with respect to the short-side displacement of the stacked containers 1 in the assembled state, the support portion 23 of the upper container 1 may come into contact with the inner surface of the long-side side wall portion 6 of the lower container 1.

[0045] Furthermore, as shown in Figure 2, the long-side locking restrictor portion 33 and the short-side locking restrictor portion 37 are formed by the sides of protrusions that project upward from the upper edges of the long-side side wall portion 6 and the short-side side wall portion 7 in the area outside the container 1, which is further outward than the long-side wall locking portion 21 and the short-side wall locking portion 22. Of these protrusions, the side opposite to the surface that constitutes the long-side locking restrictor portion 33 and the short-side locking restrictor portion 37 is an inclined surface that slopes upward toward the long-side locking restrictor portion 33 and the short-side locking restrictor portion 37.

[0046] Furthermore, in this embodiment, as shown in Figure 19, the containers 1 in their folded state are configured to be stacked vertically (layered). As shown in Figure 18, the bottom wall component 2 is provided with auxiliary base portions 41 that protrude from both ends of each long-side base portion 4 toward the short-side base portion 5. In addition, each long-side base portion 4 is provided with a base-side locking portion 42 that protrudes upward from the inner portion of the long-side base portion 4 (the inner circumference portion of the bottom wall component 2) of the upper edge of the long-side base portion 4 and extends along the width direction of the long-side base portion 4. In this embodiment, the base-side locking portion 42 is provided over the entire width direction of the long-side base portion 4, except for the area where the long-side bearing portion 8 is formed. Also, when the container 1 is in a folded state, the upper edge of the base-side locking portion 42 is located above the short-side side wall portion 7 and the long-side side wall portion 6 in the folded position. Furthermore, the upper edge of the auxiliary base portion 41 is at the same height as the upper edge of the base-side locking portion 42.

[0047] In the stacked state of the folded container 1, the outer peripheral portion 24 of the upper container 1 is supported by contacting the base-side locking portion 42 and the upper edge of the auxiliary base portion 41 of the lower container 1, while the support portion 23 of the upper container 1 is inserted into the inner side of the pair of long-side base portions 4 and auxiliary base portion 41 of the lower container 1 (the space above the short-side side wall portion 7 and the long-side side wall portion 6 in the folded position) and is configured to contact or be close to the inner surface of the long-side base portion 4 and the auxiliary base portion 41.

[0048] Furthermore, as shown in Figure 18, the long-side base portion 4 is provided with a base-side locking receiving portion 43 that accommodates (receives placement of) the long-side bottom wall locking portion 25a of the upper container 1 when the folded containers 1 are stacked. The base-side locking portion 42 is also provided with a base notch portion 44 that corresponds to the long-side bearing portion 8 and where the long-side hinge portion 11 is placed when the container 1 is assembled. In this embodiment, when the folded containers 1 are stacked, the long-side sliding auxiliary projection 26a and bulging portion 27 of the upper container 1 are accommodated in the predetermined base notch portion 44 of the lower container 1. In addition, the base-side locking receiving portion 43 and the base notch portion 44 overlap in part in the width direction of the long-side base portion 4 and are configured to be continuous in the inner and outer circumference direction of the bottom wall component 2 (thickness direction of the long-side base portion 4). Furthermore, in the inner and outer circumferential direction of the bottom wall component 2 (the thickness direction of the long-side base portion 4), the portion where the base-side locking receiving portion 43 and the base notch portion 44 are continuous is configured to penetrate the long-side base portion 4 in the inner and outer circumferential direction of the bottom wall component 2. In addition, the base-side locking receiving portion 43 is provided with a base-side locking restricting portion 45 that faces, approaches, or abuts against the long-side bottom wall locking portion 25a housed in the base-side locking receiving portion 43 in the extending direction of the long-side base portion 4. When the containers 1 are stacked in a folded state, the short-side bottom wall locking portion 25b and the short-side sliding auxiliary projection 26b of the upper container 1 are configured to be located (received) in the space between the auxiliary base portions 41 located on both sides of each short-side base portion 5.

[0049] As described in detail above, according to this embodiment, the long-side sliding auxiliary projection 26a protrudes downward from the long-side outer circumference corresponding portion 24a. When stacking assembled containers 1, if the upper container 1 is placed on the lower container 1 with a misalignment in the width direction of the long-side side wall portion 6 (the longitudinal direction of the container 1), and then the misalignment is corrected and the containers are slid to stack them (slide stacking assembled containers 1 in their longitudinal width direction), even if the long-side sliding auxiliary projection 26a is provided at a position separated from the edge on the short side of the bottom wall component portion 2, the long-side sliding auxiliary projection 26a of the upper container 1 can be reliably brought into contact (sliding contact) with the upper surface of the long-side wall locking portion 21 of the lower container 1. In this embodiment, a long-side sliding auxiliary projection 26a is provided so as to connect the long-side bottom wall locking portion 25a and the support portion 23. When the assembled container 1 is slid and stacked in its longitudinal width direction, the long-side wall locking portion 21 of the lower container 1 is guided by both the long-side bottom wall locking portion 25a and the support portion 23 of the upper container 1 (the long-side wall locking portion 21 of the lower container 1 is relatively inserted between the long-side bottom wall locking portion 25a and the support portion 23 of the upper container 1), preventing the long-side sliding auxiliary projection 26a of the upper container 1 from falling off the upper surface of the long-side wall locking portion 21 of the lower container 1. Therefore, when sliding stacking the assembled container 1 in its longitudinal direction, compared to, for example, when the edge of the short side of the bottom wall component 2 abuts (slids against) the upper surface of the locking portion 21 on the long side wall of the lower container 1, it is possible to more reliably prevent lateral displacement of the upper and lower containers 1 with respect to the direction of travel, and to slide stack them more smoothly.

[0050] Furthermore, in the stacked state of the assembled containers 1, the long-side bottom wall locking portion 25a of the upper container 1 is housed in the long-side locking receiving portion 31 of the lower container 1, and the long-side sliding auxiliary projection 26a of the upper container 1 is housed in the long-side sliding receiving portion 32 of the lower container 1. Therefore, in the stacked state of the assembled containers 1, the long-side outer circumference corresponding portion 24a of the upper container 1 can be reliably supported in contact with the long-side wall locking portion 21 of the lower container 1 without interference from the long-side bottom wall locking portion 25a and the long-side sliding auxiliary projection 26a. As a result, the locking portion 21 on the long side wall of the lower container 1 is inserted relatively deeply between the locking portion 25a on the long side bottom wall of the upper container 1 and the support portion 23, allowing the locking portion 21 on the long side wall of the lower container 1 to efficiently engage with the locking portion 25a on the long side bottom wall of the upper container 1 and the support portion 23. Consequently, relative displacement of the upper and lower containers 1 in the lateral width direction of the short side wall portion 7 (the short side width direction of the container 1) can be prevented more reliably.

[0051] Furthermore, in the stacked state of the assembled containers 1, the long-side bottom wall locking portion 25a and the long-side sliding auxiliary projection 26a of the upper container 1 are configured to be in close proximity to or in contact with the long-side locking receiving portion 31 and the long-side sliding restricting portion 34 of the long-side sliding receiving portion 32 of the lower container 1 in the lateral width direction of the long-side side wall portion 6. This makes it possible to more reliably prevent relative displacement of the upper and lower containers 1 in the lateral width direction of the long-side side wall portion 6. Therefore, the stacked state of the containers 1 can be stabilized. In addition, by providing not only the long-side slide restricting portion 34 but also the long-side locking restricting portion 33, for example, when restricting the relative displacement of upper and lower containers 1 in the longitudinal width direction in a stacked state of containers 1, the long-side slide auxiliary projection 26a not only contacts the long-side slide restricting portion 34 but also the long-side bottom wall locking portion 25 contacts the long-side locking restricting portion 33, thereby preventing damage to the long-side slide auxiliary projection 26a. Furthermore, when the long-side slide assist projection 26a comes into contact with the long-side slide restricting portion 34, the bulging portion 27 is configured to come into contact with the inner surface of the bulging portion receiving portion 39 on the side opposite to the connection side of the long-side slide assist projection 26a with the long-side bottom wall locking portion 25a. This further reduces the impact when the long-side slide assist projection 26a comes into contact with the long-side slide restricting portion 34, thereby further reducing damage to the long-side slide assist projection 26a.

[0052] Furthermore, the container 1 of this embodiment is also equipped on the short side with a short side wall locking portion 22, a short side bottom wall locking portion 25b, a short side slide assist projection 26b, a short side locking receiving portion 35, a short side slide receiving portion 36, a short side locking restricting portion 37, and a short side slide restricting portion 38. Therefore, when stacking assembled containers 1, even when the upper container 1 is placed on the lower container 1 with a misalignment in the lateral direction of the short side wall portion 7, and then the misalignment is corrected and the containers are slid to stack them (slide stacking assembled containers 1 in the short side width direction), the slide stacking can be performed relatively smoothly. Furthermore, in the stacked state of the assembled containers 1, the short-side outer circumference corresponding portion 24b of the upper container 1 can be reliably supported by the short-side wall locking portion 22 of the lower container 1 without interference from the short-side bottom wall locking portion 25b and the short-side sliding auxiliary projection 26b of the upper container 1. Moreover, in the stacked state of the assembled containers 1, the short-side bottom wall locking portion 25b and the short-side sliding auxiliary projection 26b are configured to contact or be close to the short-side locking restricting portion 37 and the short-side sliding restricting portion 38 in the short-side width direction of the container 1, thereby preventing relative displacement between the containers 1 in the lateral width direction of the short-side side wall portion 7. As a result, in combination with the above-mentioned configuration for preventing misalignment on the long side, the effect of preventing relative horizontal displacement between the stacked containers 1 is synergistically achieved, further stabilizing the stacked state of the containers 1.

[0053] Furthermore, the lower edge of the short-side sliding auxiliary projection 26b is positioned so that the outer peripheral portion of the bottom wall component 2 is higher than the inner peripheral portion of the bottom wall component 2. This prevents the short-side sliding auxiliary projection 26b from getting caught on the side of the conveying line when the container 1 is being transported on the conveying line, or from contacting the installation surface when the container 1 is placed on an installation surface such as the floor or the top surface of a pallet, due to the container 1 being in an angled position. Consequently, damage to the short-side sliding auxiliary projection 26b is prevented, and durability can be improved. Moreover, since the inner peripheral portion of the bottom wall component 2 that is connected to the support portion 23 of the short-side sliding auxiliary projection 26b protrudes further downward, the area surrounding the portion of the support portion 23 connected to the short-side sliding auxiliary projection 26b can be reinforced. Furthermore, the height difference between the lower end of the part of the short-side slide auxiliary projection 26b that is connected to the support part 23 and the lower end of the support part 23 can be reduced. When it becomes necessary to have the short-side slide auxiliary projection 26b and support part 23 of the upper container 1 (located on the forward side in the direction of travel of the slide stack) ride up onto the upper edge of the inner surface of the short-side wall locking part 22 of the lower container 1 during slide stacking in the longitudinal direction of the assembled container 1, this can be done without difficulty. In particular, since the lower edge of the short-side slide assist projection 26b has a height difference that is continuous with an inclined portion, when the assembled container 1 is to slide stack in the longitudinal direction, if it becomes necessary to have the short-side slide assist projection 26b and support portion 23 of the upper container 1 ride up onto the upper edge of the inner surface of the short-side wall locking portion 22 of the lower container 1, the slide stack can be advanced relatively smoothly by sliding the lower edge of the short-side slide assist projection 26b of the upper container 1 against the upper edge of the inner surface of the short-side wall locking portion 22 of the lower container 1.

[0054] Furthermore, in this embodiment, the lower edge of the long-side slide assist projection 26a is generally positioned above the lower edge of the long-side bottom wall locking portion 25a. Therefore, compared to a configuration in which, for example, the long-side slide assist projection 26a protrudes below the lower edge of the long-side bottom wall locking portion 25a, damage to the long-side slide assist projection 26a is suppressed. In addition, a bulge 27 is provided in the part of the support portion 23 that is connected to the long-side slide assist projection 26a, and the lower edge of the long-side slide assist projection 26a, the lower end of the bulge 27, and the lower end of the support portion 23 are stepped. As a result, when sliding the assembled container 1 in the short-width direction, if it becomes necessary to ride up the long-side slide assist projection 26a and support portion 23 of the upper container 1 (located on the forward side in the direction of slide stacking) against the upper edge of the inner surface of the long-side wall locking portion 21 of the lower container 1, it is possible to suppress situations in which it becomes difficult to ride up.

[0055] Furthermore, the long-side locking receiving portion 31 and the long-side sliding receiving portion 32 overlap in at least a portion of the forming range in the lateral direction of the long-side side wall portion 6, and are configured to be continuous in the inward-outward direction of the container 1 (thickness direction of the long-side side wall portion 6). Therefore, when removing the upper container 1 from the lower container 1 in a stacked assembled state by sliding it in the lateral direction of the long-side side wall portion 6 (unstacking the containers), when the worker slightly lifts and pulls the short-side side wall portion 7 on the near side, the long-side bottom wall locking portion 25a and the long-side sliding auxiliary projection 26a can be released from the long-side locking receiving portion 31 and the long-side sliding receiving portion 32 at approximately the same time, or as close as possible (when one is released, the other will also be released). Thus, the workability when unstacking the containers 1 can be improved. Furthermore, by making the long-side locking receiving portion 31 and the long-side sliding receiving portion 32 a continuous shape, the long-side sliding auxiliary projection 26a and the long-side bottom wall locking portion 25a can be connected, thereby mutually increasing the strength and rigidity of the long-side sliding auxiliary projection 26a and the long-side bottom wall locking portion 25a. Consequently, stability can be improved during the operation of the slide stack of the assembled container 1 and when the container 1 is stacked.

[0056] Furthermore, on the short side of the container 1, the short-side locking receiving portion 35 and the short-side sliding receiving portion 36 overlap in at least a portion of the forming range in the lateral direction of the short-side side wall portion 7, and are configured to be continuous in the inward-outward direction of the container 1 (thickness direction of the short-side side wall portion 7). As a result, effects such as improved workability when separating the container 1 in the lateral direction of the short-side side wall portion 7 are achieved.

[0057] Furthermore, the long-side slide assist projection 26a is connected to the support portion 23 and the long-side bottom wall locking portion 25a, and the portion where the long-side locking receiving portion 31 and the long-side slide receiving portion 32 are continuous in the inward-outward direction of the container 1 (thickness direction of the long-side side wall portion 6) is configured to penetrate the long-side side wall portion 6 in the inward-outward direction of the container 1. In this way, by connecting the long-side slide assist projection 26a, the support portion 23, and the long-side bottom wall locking portion 25a, the strength and rigidity of the long-side slide assist projection 26a, the support portion 23, and the long-side bottom wall locking portion 25a can be mutually increased (deformation and displacement can be prevented). Therefore, stability can be further increased during the operation of slide stacking of the assembled container 1 and in the stacked state of the assembled container 1. Furthermore, the long-side sliding auxiliary projection 26a is positioned between the support portion 23 and the long-side bottom wall locking portion 25a. When the containers 1 are slid and stacked in their longitudinal direction, the long-side wall locking portion 21 of the lower container 1 is guided by both the long-side bottom wall locking portion 25a and the support portion 23 of the upper container 1. This more reliably prevents the long-side sliding auxiliary projection 26a of the upper container 1 from falling off the upper surface of the long-side wall locking portion 21 of the lower container 1. Consequently, the assembled containers 1 can be slid and stacked more smoothly. Furthermore, as the long-side sliding auxiliary projection 26 is connected to the support portion 23 and the long-side bottom wall locking portion 25a, the long-side wall locking portion 21, which is inserted into the gap between the support portion 23 and the long-side bottom wall locking portion 25a, needs to form a recess (long-side sliding receiving portion 32) that receives the long-side sliding auxiliary projection 26a of the upper container 1 when the containers 1 are stacked in the assembled state. However, since the long-side wall locking portion 21 is located on the upper side of the long-side side wall portion 6, it is desirable to make it as small as possible, and therefore, it is desirable not to make the width of the long-side sliding auxiliary projection 26a unnecessarily wide.In this regard, as described above, when the containers 1 are stacked in an assembled state, and the relative displacement of the upper and lower containers 1 in the lateral direction of the long side wall portion 6 is restricted, if the long side slide auxiliary projection 26a of the upper container 1 comes into contact with the long side slide restricting portion 34 of the lower container 1, the long side bottom wall locking portion 25a of the upper container 1 is also configured to come into contact with the long side locking restricting portion 33 of the lower container 1. This reduces the load on the long side slide auxiliary projection 26a when the relative displacement of the upper and lower containers 1 in the lateral direction of the long side wall portion 6 is restricted in an assembled state. As a result, the durability of the long side slide auxiliary projection 26a can be improved while suppressing the reduction in strength of the long side wall locking portion 21 caused by the formation of the long side slide receiving portion 32.

[0058] Furthermore, on the short side of the container 1, the short-side slide assist projection 26b is connected to the support portion 23 and the short-side bottom wall locking portion 25b, and the portion where the short-side locking receiving portion 35 and the short-side slide receiving portion 36 are continuous in the inward-outward direction of the container 1 (in the thickness direction of the short-side side wall portion 7) is configured to penetrate the short-side side wall portion 7 in the inward-outward direction of the container 1. As a result, similar to the long side of the container 1, this provides effects such as improved stability during slide stacking of the assembled container 1 and in the stacked state of the assembled container 1.

[0059] Furthermore, the lower end of the long-side sliding auxiliary projection 26a and the lower end of the long-side bottom wall locking portion 25a are located above the lower end of the support portion 23. Therefore, when the container 1 is placed on the installation surface and the support portion 23 makes contact with the installation surface, the long-side sliding auxiliary projection 26a and the long-side bottom wall locking portion 25a are separated upward from the installation surface (floating). Consequently, damage to the long-side sliding auxiliary projection 26a and the long-side bottom wall locking portion 25a can be prevented. In addition, the lower end of the long-side sliding auxiliary projection 26a is located above the lower end of the portion of the long-side bottom wall locking portion 25a that is connected to the long-side sliding auxiliary projection 26a, and the lower end of the portion of the support portion 23 that is connected to the long-side sliding auxiliary projection 26a. Therefore, when the assembled container 1 is slid and stacked, even the portion of the long side wall locking portion 21 that abuts against the long side slide auxiliary projection 26a faces the long side bottom wall locking portion 25a and the support portion 23, so that the sliding stack of the container 1 is guided more stably.

[0060] Furthermore, on the short side of container 1, the lower end of the short-side slide assist projection 26b and the lower end of the short-side bottom wall locking portion 25b are located above the lower end of the support portion 23. This provides effects such as preventing damage to the short-side slide assist projection 26b and the short-side bottom wall locking portion 25b. In addition, the lower end of the short-side slide assist projection 26b is located above the lower end of the portion of the support portion 23 that is connected to the short-side slide assist projection 26b. Therefore, even in the portion of the short-side wall locking portion 22 that contacts the short-side slide assist projection 26b during slide stacking, its side surface faces the support portion 23, resulting in more stable guidance of the slide stacking of container 1.

[0061] Furthermore, the bottom wall component 2 is equipped with a base-side locking portion 42 that protrudes upward from the upper side of the long-side base portion 4, and is configured to allow the folded container 1 to be slid and stacked in order to eliminate the misalignment when it is placed with a misalignment in the longitudinal direction of the container 1 (sliding stacking of the folded container 1 in its longitudinal direction). In other words, when sliding stacking the folded container 1 in its longitudinal direction, the long-side sliding auxiliary projection 26a of the upper container 1 abuts and slides against the upper surface of the base-side locking portion 42 of the lower container 1. At this time, the base-side locking portion 42 of the lower container 1 is relatively inserted between the long-side bottom wall locking portion 25a of the upper container 1 and the support portion 23, preventing the long-side sliding auxiliary projection 26a of the upper container 1 from falling off the upper surface of the base-side locking portion 42 of the lower container 1. Therefore, just as in the assembled state, the folded container 1 can be slid and stacked relatively smoothly in its longitudinal direction.

[0062] Furthermore, in the stacked state of the folded container 1, the long-side bottom wall locking portion 25a of the upper container 1 is housed in the base-side locking receiving portion 43 of the lower container 1, and the long-side sliding auxiliary projection 26a of the upper container 1 is housed in the base notch portion 44 of the lower container 1 (the area where the long-side hinge portion 11 is located in the assembled state of the container 1). In addition, the short-side bottom wall locking portion 25b and the short-side sliding auxiliary projection 26b of the upper container 1 are housed in the space between the auxiliary base portions 41 located on both sides of each short-side base portion 5 of the lower container 1. Therefore, even when the folded containers 1 are stacked, the outer circumference corresponding portion 24 of the upper container 1 can be reliably supported in contact with the base-side locking portion 42 and auxiliary base portion 41 of the lower container 1 without interference from the long-side bottom wall locking portion 25a, the long-side sliding auxiliary projection 26a, the short-side bottom wall locking portion 25b, and the short-side sliding auxiliary projection 26b. As a result, the base-side locking portion 42 of the lower container 1 is inserted relatively deeply between the long-side bottom wall locking portion 25a and the support portion 23 of the upper container 1, and the base-side locking portion 42 of the lower container 1 can be effectively engaged with the long-side bottom wall locking portion 25a and the support portion 23 of the upper container 1. Consequently, the height of the stacked folded containers 1 can be kept as low as possible, while relative displacement between the upper and lower containers 1 in the short-side width direction can be prevented more reliably. Furthermore, in the stacked state of the folded containers 1, the locking portion 25a on the long side bottom wall of the upper container 1 is configured to be in close proximity to or in contact with the base-side locking restricting portion 45 of the base-side locking receiving portion 43 of the lower container 1 in the longitudinal width direction of the container 1. This makes it possible to more reliably prevent relative displacement between the folded containers 1 in the longitudinal width direction when stacked. Therefore, the stacked state of the folded containers 1 can be stabilized.

[0063] Furthermore, the embodiment is not limited to the description above, and may be implemented as follows, for example. Of course, other applications and modifications not exemplified below are also possible.

[0064] (a) In the above embodiment, for the sake of explanation, the long side side wall portion 6 corresponds to the first side wall portion and the short side side wall portion 7 corresponds to the second side wall portion. However, the long side of the container 1 is provided with a long side wall locking portion 21, a long side bottom wall locking portion 25a, a long side slide auxiliary projection 26a, a long side locking receiving portion 31, a long side slide receiving portion 32, a long side locking restricting portion 33, and a long side slide restricting portion 34. In addition, the short side is also provided with a short side wall locking portion 22, a short side bottom wall locking portion 25b, a short side slide auxiliary projection 26b, a short side locking receiving portion 35, a short side slide receiving portion 36, a short side locking restricting portion 37, and a short side slide restricting portion 38. Therefore, it is also possible to consider the short side side wall portion 7 as the first side wall portion and the long side side wall portion 6 as the second side wall portion. Furthermore, it is possible to omit all or part of one of the configurations on the long side and the short side (a configuration in which the first side wall portion applies to only one of the long side side wall portion 6 and the short side side wall portion 7). However, if the bottom wall side locking portion 25 and the slide auxiliary projection 26 are provided, corresponding locking receiving portions 31, 35 and slide receiving portions 32, 36 shall be provided.

[0065] (b) In the above embodiment, in the lateral width direction of the long side side wall portion 6, the long side slide auxiliary projection 26a is provided within the formation range of the support portion 23 and within the formation range of the long side bottom wall locking portion 25a. However, it may also be provided within the formation range of either the support portion 23 or the long side bottom wall locking portion 25a, or it may be provided in a location near one or both of the formation ranges. Furthermore, in the lateral width direction of the short side side wall portion 7, the short side slide auxiliary projection 26b is provided within the formation range of the support portion 23 and within the formation range of the short side bottom wall locking portion 25b. However, it may also be provided within the formation range of either the support portion 23 or the short side bottom wall locking portion 25b, or it may be provided in a location near one or both of the formation ranges. In other words, by positioning the slide assist projection 26 near the support portion 23 and the bottom wall side locking portion 25, the relative displacement of the side wall side locking portions 21 and 22 of the lower container 1 that slide against the slide assist projection 26 of the upper container 1 during the slide stacking of the container 1 is suitably guided by the support portion 23 and the bottom wall side locking portion 25, resulting in the effect of relatively smooth slide stacking. However, if the slide assist projection 26 is provided within the formation range of the support portion 23 and the bottom wall side locking portion 25, and further connected to them, this effect is more pronounced.

[0066] Although it is also possible to configure the slide assist projection 26 not to be connected to the support portion 23 and the bottom wall side locking portion 25, connecting them eliminates the gap between the slide assist projection 26 of the upper container 1 and the support portion 23 and the bottom wall side locking portion 25, which would otherwise be occupied by the side wall locking portions 21 and 22 of the lower container 1 when the containers are slid and stacked. Furthermore, the slide assist projection 26, the support portion 23, and the bottom wall side locking portion 25 reinforce each other, thereby stabilizing the shape.

[0067] Furthermore, while the formation positions of the long-side slide assist protrusions 26a and short-side slide assist protrusions 26b are not particularly limited, it is desirable that they be provided close to the corners of the bottom wall component 2 (support portion 23) in order to facilitate the sliding stacking of the container 1. In addition, considering the provision of the long-side slide receiving portion 32 and the short-side slide receiving portion 36 (to secure a portion for accommodating the long-side slide assist protrusions 26a and short-side slide assist protrusions of the upper container 1 in a stacked state of the folded container 1), it is desirable that they be positioned away from the corners of the bottom wall component 2.

[0068] (c) With regard to the configuration for restricting the relative displacement of the long-side bottom wall locking portion 25a and the long-side slide auxiliary projection 26a, which are housed in the long-side locking receiving portion 31 and the long-side slide receiving portion 32, the configuration may be such that only the relative displacement of the long-side side wall portion 6 in one direction in the width direction is restricted, or the configuration may be such that the displacement of the long-side side wall portion 6 in both directions in the width direction is restricted. However, even if each long-side side wall portion 6 is provided with a pair of long-side locking receiving portions 31 and long-side sliding receiving portions 32, and each pair is configured to restrict only the relative displacement of the long-side bottom wall locking portion 25a and long-side sliding auxiliary projection 26a, which are housed within each pair, in one direction in the lateral direction of the long-side side wall portion 6, it is desirable that the two pairs of long-side locking receiving portions 31 and long-side sliding receiving portions 32 are in opposite directions, thereby restricting the displacement of the long-side side wall portion 6 in both directions in the lateral direction. Furthermore, in a stacked container 1, if the predetermined long-side bottom wall locking portion 25a and long-side sliding auxiliary projection 26a of the upper container 1 are displaced relative to the lower container 1 toward the center in the lateral direction of the long-side side wall portion 6, and the predetermined long-side bottom wall locking portion 25a and long-side sliding auxiliary projection 26a come into contact with the long-side locking restricting portion 33 and long-side sliding restricting portion 34, thereby restricting further relative displacement, when unstacking the container 1 by sliding it in the longitudinal width direction of the container 1, the long-side bottom wall locking portion 25a and long-side sliding auxiliary projection 26a on the side in front of the worker... Alternatively, the container 1 to be removed by the worker can be slightly lifted on the front side to release it from the long-side locking receiving portion 31 and the long-side sliding receiving portion 32. For the long-side bottom wall locking portion 25a and the long-side sliding auxiliary projection 26a on the rear side, the long-side locking receiving portion 31 is not located on the lateral central side of the long-side side wall portion 6 beyond the long-side bottom wall locking portion 25a, and the side surface of the long-side sliding receiving portion 32, which is located on the lateral central side of the long-side side wall portion 6 beyond the long-side sliding auxiliary projection 26a, can be made inclined, allowing it to be released relatively smoothly from the long-side locking receiving portion 31 and the long-side sliding receiving portion 32.Furthermore, regarding the configuration for restricting the relative displacement of the short-side bottom wall locking portion 25b and the short-side slide auxiliary projection 26b, which are housed in the short-side locking receiving portion 35 and the short-side slide receiving portion 36, the configuration may be such that only the relative displacement in one direction in the lateral direction of the short-side side wall portion 7 is restricted, or the configuration may be such that the displacement in both directions in the lateral direction of the short-side side wall portion 7 is restricted.

[0069] (d) In the above embodiment, the lower edge of the long-side bottom wall locking portion 25a is located below the lower edge of the long-side sliding auxiliary projection 26a. However, the lower edge of the long-side bottom wall locking portion 25a and the lower edge of the long-side sliding auxiliary projection 26a may be at the same position in the vertical direction, or the lower edge of the long-side bottom wall locking portion 25a may be configured to be located above the lower edge of the long-side sliding auxiliary projection 26a. Furthermore, even if the lower edge of the long-side bottom wall locking portion 25a is in the same position as the lower edge of the long-side slide assist projection 26a, or is located above the lower edge of the long-side slide assist projection 26a, when the containers 1 are slid and stacked, the upper container 1 is in an inclined position relative to the lower container 1. Although the engagement distance is shortened, the long-side wall locking portion 21 of the lower container 1 can be guided by the long-side bottom wall locking portion 25a of the upper container 1. In particular, this effect is more pronounced when the long-side bottom wall locking portion 25a of the upper container 1 is connected to the long-side slide assist projection 26a (located in the same position as or near the long-side slide assist projection 26a in the longitudinal width direction of the container 1). Furthermore, with respect to the lower edge of the short-side bottom wall locking portion 25b, the lower edge of the portion of the short-side sliding auxiliary projection 26b that is connected to the short-side bottom wall locking portion 25b may be positioned below or above it. In addition, the shape of the (lower edge) portions of the long-side sliding auxiliary projection 26a and the short-side sliding auxiliary projection 26b is not particularly limited, and their lower edges may be in a straight line (approximately horizontal or oblique to the horizontal), have portions with different inclines, or be stepped.

[0070] (e) In the above embodiment, the long-side bottom wall locking portion 25a housed in the long-side locking receiving portion 31 may contact the long-side locking restricting portion 33 before the long-side slide auxiliary projection 26a housed in the long-side slide receiving portion 32 contacts the long-side slide restricting portion 34. In other words, although not specifically mentioned in the above embodiment, in the longitudinal width direction of the container 1, the width of the long-side slide auxiliary projection 26a is set to be shorter than the width of the long-side bottom wall locking portion 25a connected to the long-side slide auxiliary projection 26a (in order to avoid a reduction in strength due to the formation of a relatively large recess in the long-side wall locking portion 21 resulting from the formation of the long-side slide receiving portion 32). In this regard, by actively bringing the long-side bottom wall locking portion 25a, which has relatively high impact resistance in the longitudinal width direction of the container 1, into contact with the long-side locking restricting portion 33, it is possible to more stably prevent misalignment of the container 1 in the longitudinal width direction and to protect the long-side sliding auxiliary projection 26a (even if contact occurs, it can occur after the impact has been absorbed to some extent). Here, a configuration is assumed in which the long-side sliding auxiliary projection 26a and the long-side sliding restricting portion 34 can come into contact when the assembled container 1 is stacked, but a configuration in which they do not come into contact at all is also possible. Furthermore, in a stacked state of the assembled container 1, a configuration in which the long-side sliding auxiliary projection 26a and the long-side sliding restricting portion 34 can come into contact before the long-side bottom wall locking portion 25a comes into contact with the long-side locking restricting portion 33 is also possible. Furthermore, the short-side bottom wall locking portion 25b housed in the short-side locking receiving portion 35 may be configured to contact the short-side locking restricting portion 37 before the short-side slide auxiliary projection 26b housed in the short-side slide receiving portion 36 contacts the short-side slide restricting portion 38. The same applies to the other application examples and modifications described above (the application examples and modifications for the long side may also be applied to the short side).

[0071] (f) Although the container 1 in the above embodiment is made of polypropylene, it may also be made of other resin materials such as polyethylene, PET, or polyamide. Furthermore, when the container 1 is folded, the pair of long side wall portions 6 may be folded first, and then the pair of short side wall portions 7 may be folded. In addition, in the above embodiment, the height positions of the pair of short side wall portions 7 in the lying position are aligned, while the pair of long side wall portions 6 in the lying position overlap each other vertically. However, for example, the short side wall portions 7 in the lying position may overlap each other vertically, or the height positions of the long side wall portions 6 in the lying position may be aligned. [Explanation of Symbols]

[0072] 1...Container, 2...Bottom wall component, 6...Long side wall portion, 7...Short side wall portion, 21...Long side wall locking portion, 22...Short side wall locking portion, 23...Support portion, 24...Outer circumference corresponding portion, 24a...Long side outer circumference corresponding portion, 24b...Short side outer circumference corresponding portion, 25...Bottom wall locking portion, 25a...Long side bottom wall locking portion, 25b...Short side bottom wall locking portion, 26...Slide assist projection, 26a...Long side slide assist projection, 26b...Short side slide assist projection, 31...Long side locking receiving portion, 32...Long side slide receiving portion, 33...Long side locking restricting portion, 34...Long side slide restricting portion, 35...Short side locking receiving portion, 36...Short side slide receiving portion, 37...Short side locking restricting portion, 38...Short side slide restricting portion.

Claims

1. A container comprising a bottom wall component having a substantially rectangular shape in plan view, first side wall components rotatably connected to a pair of opposing first side edges of the bottom wall component, and second side wall components rotatably connected to a pair of opposing second side edges of the bottom wall component, The first side wall portion and the second side wall portion are configured to be rotatably displaceable between an upright position in which they are erected above each side portion of the bottom wall component and a folded position in which they are tilted toward the central portion of the bottom wall component. The container is configured to be able to change between an assembled state in which all of the side walls are in the upright position and a folded state in which all of the side walls are in the folded position. The containers are configured to be stacked on top of each other in the assembled state, The bottom wall component comprises an outer peripheral corresponding portion that, when the assembled containers are stacked, is supported by the upper edge of the side wall portion of the lower container and faces the upper surface of the upper edge of the side wall portion of the lower container; a support portion that protrudes downward from a portion on the inner circumference side of the outer peripheral corresponding portion and below the outer peripheral corresponding portion; and a bottom wall side locking portion that protrudes downward from the outer peripheral corresponding portion such that a gap is formed between it and the support portion. The side wall portion includes a side wall locking portion that is inserted into the gap between the bottom wall locking portion of the upper container and the support portion when the containers are stacked in the assembled state. The bottom wall component is provided with a sliding auxiliary projection that protrudes downward from the outer peripheral corresponding portion. The bottom wall side locking portion includes a first bottom wall side locking portion that protrudes downward from the first outer peripheral corresponding portion that extends along the first side portion of the outer peripheral corresponding portion, The slide assist projection comprises a first slide assist projection that protrudes downward from the first outer peripheral corresponding portion, In a state where the upper container is placed on the lower container in the assembled state with a position offset in the lateral direction of the first side wall, the first sliding auxiliary projection of the upper container is configured to abut against the upper surface of the side wall locking portion corresponding to the first side wall of the lower container. The first side wall portion includes a first receiving portion that accommodates the first bottom wall locking portion of the upper container when the assembled containers are stacked on top of each other, and a second receiving portion that accommodates the first sliding auxiliary projection of the upper container. The first receiving portion is provided with a first restricting portion that faces the first bottom wall side locking portion housed in the first receiving portion in the lateral width direction of the first side wall portion, The container is characterized in that the second receiving portion is provided with a second restricting portion that faces the first slide assisting projection housed in the second receiving portion in the lateral width direction of the first side wall.

2. The container according to claim 1, characterized in that the lower edge portion of the predetermined slide assist projection is located above the outer peripheral portion of the bottom wall component than the inner peripheral portion of the bottom wall component.

3. The container according to claim 1 or 2, characterized in that the first receiving portion and the second receiving portion overlap in at least a portion of the forming range in the lateral direction of the first side wall portion and are continuous in the inward and outward directions of the container.

4. The aforementioned slide assist projection is connected to the support portion and the bottom wall side locking portion. The container according to claim 3, characterized in that the portion where the first receiving portion and the second receiving portion are continuous in the inward and outward direction of the container penetrates the first side wall portion in the inward and outward direction of the container.

5. The lower end of the slide assist projection is located above the lower end of the support portion. The container according to claim 1 or 2, characterized in that the lower end of the predetermined bottom wall side locking portion is at the same vertical position as the lower end of the slide assist projection, or the lower end of the bottom wall side locking portion is located above the lower end of the slide assist projection.

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