Container

Abstract

To provide a container capable of closing a gap between side wall parts in a corner part when it is in an assembly state, and capable of preventing jumping out of a content from the container and entering of dust into the container.SOLUTION: A container (1) includes a bottom wall constitution part (11) which includes a pair of first base parts (11B) and a pair of second base parts (11C). The bottom wall constitution part includes an auxiliary protrusion part (18) protruding upward of the second base part from both end parts of the pair of first base parts. A first side wall (12) includes: a pair of recessed parts (35) which can receive the auxiliary protrusion part in a folded state; a pair of side part protrusion parts (37) arranged at a side edge inside the recessed parts; and a pair of upper part protrusion parts (38) arranged on the upper side of the recessed part. A second side wall part (13) includes a pair of cover protrusion parts (43) coming into contact with or approaching the inside surfaces of the pair of side part protrusion parts and the pair of upper part protrusion parts, in an assembly state.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a container. [Background technology]

[0002] Various foldable containers have been proposed. In a container described in Patent Document 1, corners of the bottom wall are provided with bank reinforcement sections formed by bending both longitudinal ends of a first bank section toward a second bank section at right angles. The bank reinforcement section has an upright surface that faces the second bank section and extends vertically, and an arc surface that connects the upright surface to the upper surface of the locking protrusion wall. A recess for receiving the bank reinforcement section is provided at the lower end of the side of the second side wall, and the recess has an upright surface and an arc surface that overlap the upright surface and the arc surface of the bank reinforcement section with a gap. A gap cover protrudes from the edge of the recess on the inner surface of the second side wall toward the recess. When the container is assembled, the gap cover overlaps the bank reinforcement section from the inside, sealing the gaps between the upright surfaces and the arc surfaces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-45157 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional configurations, the vertical length of the bank reinforcement must be increased in order to stably stack containers in a folded state. However, increasing the vertical length of the bank reinforcement requires a large cutout at the top of the recess to prevent the recess from interfering with the bank reinforcement. As a result, when the container is assembled, the gaps connecting the recesses between the side walls at the corners become larger, which can cause contents to spill out of the container into the recess or cause debris to enter the container through the gaps connecting the recesses.

[0005] One aspect of the present invention aims to provide a container that, when assembled, can seal the gaps between side wall portions at the corners, preventing contents from spilling out of the container and dust and other debris from entering the container. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a container according to one aspect of the present invention includes a bottom wall component including a bottom wall portion having a generally rectangular shape in a plan view, a pair of first base portions respectively protruding upward from a pair of opposing side edges of the bottom wall portion, and a pair of second base portions respectively protruding upward from a pair of opposing side edges of the bottom wall portion and lower in height than the first base portions, a first side wall portion rotatably connected to the first base portions, and a second side wall portion rotatably connected to the second base portions. The bottom wall constituent portion has auxiliary protrusions that protrude above the second base portion from both ends of the pair of first base portions and are connected to the upper surface side of the second base portion, and is capable of changing between a folded state in which the first side wall portion and the second side wall portion are folded by rotating the first side wall portion and the second side wall portion inward, and an assembled state in which the first side wall portion and the second side wall portion are erected from the folded state, and the first side wall portion protrudes inward from both side edges of the inner surface. a pair of regulating wall portions that protrude from an inner surface in the protruding direction of the regulating wall portions, a pair of recesses that can receive the auxiliary protrusions in the folded state, a pair of side protrusions that protrude from an inner surface in the protruding direction of the regulating wall portions and are arranged on side edges of the recesses that are on the inner side with respect to the regulating wall portions, and a pair of upper protrusions that are provided continuously from end edges of the pair of side protrusions on the regulating wall portion side, protrude from the inner surface in the protruding direction of the regulating wall portions, and are arranged on the upper side of the recesses in the assembled state, and the second side wall portion comprises a pair of regulated wall portions that abut against or are close to the regulating wall portions on both sides of the outer surface in the assembled state, and a pair of cover protrusions that are formed protruding inward from the inner surface and are abutting against or are close to inner surfaces of the pair of side protrusions and the pair of upper protrusions in the assembled state, and are capable of closing the pair of recesses, and when changing from the folded state to the assembled state, the first side wall portion is raised and then the second side wall portion is raised to achieve the assembled state. [Effects of the Invention]

[0007] According to one aspect of the present invention, when the foldable container is assembled, the pair of side protrusions and the pair of upper protrusions come into contact with or are close to the pair of cover protrusions, thereby closing the gaps that connect to the recesses between the side wall portions at the corners, thereby preventing contents from spilling out of the container and dust from entering the container when the container is assembled. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an assembled state of a foldable container according to an embodiment. FIG. [Figure 2] FIG. 10 is a perspective view showing the container with the second side wall portion folded. [Figure 3] 10 is a perspective view showing the container in a folded state with the first side wall portion folded. FIG. [Figure 4] FIG. [Figure 5] FIG. 5 is an enlarged perspective view of a portion V in FIG. 4. [Figure 6] 1A and 1B are a perspective view of a first side wall portion as seen from inside, a partially enlarged perspective view of an A1 portion of the perspective view, and a partially enlarged perspective view of an A2 portion of the perspective view. [Figure 7] FIG. 7 is a partially enlarged plan view of portion VII of FIG. [Figure 8] 1A is a perspective view of the second side wall portion as seen from inside, a partially enlarged perspective view of a portion B1 in the perspective view, and a partially enlarged perspective view of a portion B2 in the perspective view. [Figure 9] 10 is a partially enlarged perspective view including a partial cross section of the container, showing a state in which the second side wall portion is folded. FIG. [Figure 10] FIG. 2 is a partially enlarged perspective view of the X portion of FIG. [Figure 11] FIG. 2 is a partially enlarged plan view of a portion XI in FIG. [Figure 12] FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. [Figure 13] FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. 10. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described in detail below with reference to Figures 1 to 13. The schematic configuration of a container 1 will be described with reference to Figures 1 to 9.

[0010] [Overview of Container 1] As shown in Figure 1, the container 1 has a rectangular parallelepiped shape with an open top, and is foldable as shown in Figures 2 and 3. The foldable container 1 is made of resin, such as polypropylene.

[0011] [Configuration of bottom wall component 11] As shown in FIG. 1, the container 1 includes a bottom wall component 11 having a bottom wall portion 11A, a pair of first side wall portions 12, and a pair of second side wall portions 13. The bottom wall component 11 is generally rectangular in plan view and is located at the bottom of the container 1. As shown in FIGS. 1 and 4, the bottom wall component 11 includes first base portions 11B that protrude upward from a pair of opposing long side portions in the longitudinal direction of the side edges of the bottom wall portion 11A. The bottom wall component 11 also includes second base portions 11C that protrude upward from opposing short side portions in the lateral direction of the bottom wall portion 11A and are shorter in height than the first base portions 11B.

[0012] 1 to 3, the container 1 includes a pair of first side walls 12 rotatably connected to each first base 11B, and a pair of second side walls 13 rotatably connected to each second base 11C. The first side walls 12 and the second side walls 13 are configured to be able to change states between an assembled state in which they are erected above the first base 11B and the second base 11C, respectively, and a folded state in which they are tilted toward the center of the bottom wall 11A and folded parallel to the bottom wall 11A.

[0013] 4 and 5, the length by which first base portion 11B protrudes upward from bottom wall portion 11A is longer than the length by which second base portion 11C protrudes upward from bottom wall portion 11A. Furthermore, the position at which first bearing portion 15 of first base portion 11B, which rotatably supports first side wall portion 12, is formed is located higher than the position at which second bearing portion 16 of second base portion 11C, which rotatably supports second side wall portion 13, is formed. Furthermore, each second base portion 11C is provided so as to connect the inner surfaces of both longitudinal end portions of a pair of opposing first base portions 11B, and the longitudinal length of first base portion 11B is formed to be approximately the same as the length of the long side portion in the longitudinal direction of bottom wall portion 11A.

[0014] [Configuration of auxiliary protrusion 18] The bottom wall constituent part 11 has auxiliary protrusions 18 extending upward from both ends of the second base part 11C so as to be at the same height as the first base part 11B. In other words, the bottom wall constituent part 11 has four auxiliary protrusions 18 that protrude above the second base part 11C from both ends of the pair of first base parts 11B and are connected to the upper surface side of the second base part 11C. As a result, by increasing the vertical length of the auxiliary protrusions 18, the vertical height of the first base part 11B can be increased, and the bending rigidity in the longitudinal direction of the first base part 11B can be increased. As a result, the mechanical strength of the bottom wall constituent part 11 is improved, and containers 1 in the folded state can be stably stacked one on top of the other.

[0015] [Connection structure between first side wall portion 12 and second side wall portion 13] 1 and 7, the first side wall 12 has a plurality of shafts 21 that protrude downward from the lower edge and are rotatably connected to the first bearings 15 of the first base 11B. Also, as shown in Fig. 1 and 8, the second side wall 13 has a plurality of shafts 22 that protrude downward from the lower edge and are rotatably connected to the second bearings 16 of the second base 11C.

[0016] [Configuration of bottom wall overlapping portion 11D] 4 and 5, the first base portion 11B, the auxiliary protrusion 18, and the second base portion 11C have a bottom wall overlapping portion 11D formed to form a step at the inner upper edge. The bottom wall overlapping portion 11D is formed to have a step with a depth of approximately 2 mm to 5 mm and a height of approximately 2 mm to 5 mm, for example. Note that the depth and height are shown as examples and are not intended to limit the lengths, and may be set appropriately depending on the size of the container 1, etc.

[0017] [Folding and assembly instructions] When the assembled container 1 is to be folded, the pair of second side walls 13 are first brought to the folded position as shown in Fig. 2, and then the pair of first side walls 12 are displaced to the folded position as shown in Fig. 3. As shown in Figs. 2 and 3, in the folded state of the container 1, the second side walls 13 in the folded position overlap the top of the bottom wall 11A, and the first side walls 12 in the folded position overlap the top of the second side walls 13.

[0018] The pair of second side wall portions 13 in the folded position are supported by contacting the bottom wall portion 11A, and the pair of first side wall portions 12 in the folded position are supported by contacting the pair of second side wall portions 13. Therefore, when the container 1 is changed from the folded position to the assembled position, the pair of first side wall portions 12 are first raised and then the pair of second side wall portions 13 are raised to achieve the assembled position.

[0019] [Engagement Structure of the Restricting Wall Portion 24 and the Restricted Wall Portion 28] 1, 2, 6, and 9, each first side wall 12 is provided with a pair of restriction walls 24 that protrude inward of the container 1 from both longitudinal side edges. A pair of insertion holes 25 that penetrate the first side wall 12 in the longitudinal direction is provided at both vertical ends of the restriction wall 24. The restriction wall 24 also has a lock engaging portion 26 between the pair of insertion holes 25 in the vertical direction. The lock engaging portion 26 has a substantially square frame-shaped opening in the protruding direction of the restriction wall 24, and a locking member 31 (described below) is inserted into the opening.

[0020] 1, 2, and 8, regulated walls 28 are provided on both sides of the outer surface of the second side wall 13, which abut against or are close to the regulating wall 24 of the first side wall 12 when the container 1 is assembled. The regulated walls 28 are configured to reduce the thickness of the outer surface of the second side wall 13, and the total thickness of the regulating wall 24 and the regulated wall 28 is configured to be approximately equal to the thickness of the second side wall 13.

[0021] A pair of insertion protrusions 29 are provided on both sides of the second side wall 13, protruding outward in an L-shaped cross section from the inner surface of the regulated wall 28 and inserted into a pair of insertion holes 25 of the regulating wall 24 when the container 1 is in an assembled state. With this configuration, when the container 1 is in an assembled state, the first side wall 12 and the second side wall 13 are prevented from tilting outward of the container 1, and the relative displacement between the first side wall 12 and the second side wall 13 in the vertical direction is restricted.

[0022] 1 and 8, a pair of locking members 31 are provided above the outer surfaces of the pair of second side wall portions 13 to restrict rotational displacement of the second side wall portions 13 toward the inside of the container 1 when the container 1 is in the assembled state, thereby maintaining the assembled state of the container 1. When the container 1 is in the assembled state, the pair of locking members 31 are configured to be displaceable between a protruding position where they are inserted into and locked into the lock engaging portions 26 of the first side wall portions 12, and a retracted position where they are removed from the lock engaging portions 26 and the locked state is released.

[0023] The pair of locking members 31 are operated by operating an operating unit 32 shown in Fig. 1. The operating unit 32 is provided above the outer surfaces of the pair of second side wall portions 13, and approximately in the center in the left-right direction when viewed from the front. The position where the operating unit 32 is provided is not limited to this, and it may be provided in any position that is easy for the user of the container 1 to operate. The operating unit 32 can displace the pair of locking members 31 from the protruding position to the retracted position with a single operation.

[0024] [Configuration of the recess 35 of the first side wall portion 12] 6, the pair of first side wall portions 12 are provided with recesses 35 cut out in an L-shaped cross section at the lower ends of both longitudinal side edges. As shown in FIGS. 3 and 7, each recess 35 is provided to avoid interference with the auxiliary protrusion 18 when the first side wall portion 12 is in the folded position. When the first side wall portion 12 is in the folded position, a gap of a predetermined distance, for example, a gap of approximately 3 mm to 5 mm, is formed between the inner surface of the recess 35 and the side wall of the auxiliary protrusion 18. Note that the predetermined gap distance is shown as an example and may be set appropriately depending on the size of the container 1, etc.

[0025] The recess 35 cut out in an L-shaped cross section is just one example, and recesses 35 cut out in a U-shaped cross section, a rectangular groove cross section, or the like may be provided at the lower ends of both longitudinal side portions of the first side wall portion 12. When the first side wall portion 12 is in the folded position, interference with the auxiliary protrusion 18 can be avoided by configuring the recess 35 cut out in a U-shaped cross section, a rectangular groove cross section, or the like to be able to enter the auxiliary protrusion 18.

[0026] 1, when the container 1 is in an assembled state, a relatively large space is formed between the upper end surfaces of the auxiliary protrusions 18 provided at both longitudinal ends of the pair of first base portions 11B and the recess 35. As will be described later, this space is closed when the side protrusions 37 and the cover protrusion 43 come into contact with or are close to each other when the container 1 is in an assembled state.

[0027] 7, by increasing the protruding length L1 of auxiliary protrusion 18 from first base portion 11B to second base portion 11C, it is possible to improve the mechanical strength of container 1. Furthermore, even when a container with a large radius of curvature at the corners of the lower protrusions protruding from the underside is stacked on top of folded container 1, by increasing length L1 of auxiliary protrusion 18, it is possible to regulate the inward and outward movement of the stacked containers.

[0028] [Configuration of side protrusion 37 and upper protrusion 38] 6, each first side wall 12 is disposed inside the restricting wall 24 of the recess 35, i.e., along the inner side edge, and is provided with a pair of side protrusions 37 that protrude from the inner surface of the container 1 in the protruding direction of the restricting wall 24. Furthermore, each first side wall 12 is provided with a pair of upper protrusions 38 that are continuous with the edges of the pair of side protrusions 37 on the restricting wall 24 side, protrude from the inner surface of the container 1 in the protruding direction of the restricting wall 24, and are disposed above the recess 35.

[0029] Furthermore, upper protrusion 38 extends so as to be inclined toward the side edge as it extends upward from the upper end edge of side protrusion 37 when container 1 is assembled, and is provided so as to be inclined obliquely upward and outward. In other words, when container 1 is assembled, upper protrusion 38 is inclined obliquely upward and outward as it extends from the upper end edge of side protrusion 37 toward the side edge of first side wall 12.

[0030] Furthermore, when the container 1 is in an assembled state, the side protrusions 37 and the upper protrusions 38 have protrusion inclined surfaces 39 that are inclined so as to approach the inner surface of the second side wall 13 as they move inward of the container 1. In other words, when the container 1 is in an assembled state, the side protrusions 37 and the upper protrusions 38 have protrusion inclined surfaces 39 that are inclined so as to widen as they approach the inner surface of the first side wall 12 from the tip edges toward the inner side of the container 1.

[0031] [Configuration of side wall overlap portion 12A] 6, when the container 1 is assembled, the pair of first side walls 12 have side wall overlapping portions 12A formed at the inner lower edges and the lower edges of the pair of side protrusions 37. The side wall overlapping portions 12A protrude so as to fit into the bottom wall overlapping portion 11D of the first base portion 11B. Therefore, when the container 1 is assembled, the side wall overlapping portions 12A of the pair of first side walls 12 and the bottom wall overlapping portion 11D of the first base portion 11B face each other in the horizontal direction.

[0032] 8, the pair of second side walls 13 are provided with recesses 41 cut out in an L-shaped cross section at the lower ends of both side edges. Each recess 41 is provided so as to abut against or be adjacent to the upper end surfaces of the auxiliary protrusions 18 and the side walls in the protruding direction of the auxiliary protrusions 18 when the second side walls 13 are in an upright position. The pair of second side walls 13 are also provided with a pair of regulated walls 28 on both sides of the outer surface, i.e., above each recess 41 on the outer surface, that abut against or be adjacent to the pair of regulating walls 24 of the first side wall 12 when the container 1 is assembled. Note that the recesses 41 cut out in an L-shaped cross section are only an example, and recesses 41 cut out in an arc-shaped or semicircular-shaped cross section, for example, may be provided at the lower ends of both side edges of the second side wall 13 to match the shape of the tip of the auxiliary protrusion 18 in the protruding direction.

[0033] [Configuration of cover protrusion 43] The pair of second side walls 13 are provided with a pair of cover protrusions 43 that protrude inward from both sides of the inner surface, i.e., from the upper portion of the outer end of each recess 41 on the inner surface. The vertical length of the cover protrusions 43 is set to be approximately equal to the height from the inner lower end of the side protrusion 37 of the first side wall 12 to the inner upper end of the upper protrusion 38. The protrusion height of the cover protrusions 43 from the inner surface is set to be approximately flush with the protrusion inclined surfaces 39 of the side protrusions 37 of the first side wall 12 when the container 1 is in an assembled state.

[0034] Furthermore, in the assembled state of the container 1, the cover protrusion 43 has a cover protrusion inclined surface 45 that is inclined so that the inner side surface of the cover protrusion 43 approaches the inner surface of the first side wall 12 as it moves inward relative to the upper end surface of the cover protrusion 43 and the side edge of the second side wall 13. In other words, in the assembled state of the container 1, the cover protrusion 43 has a cover protrusion inclined surface 45 that is inclined so that the inner side surface of the cover protrusion 43 widens relative to the upper end surface of the cover protrusion 43 and the side edge of the second side wall 13 as it moves closer to the inner surface of the second side wall 13 from the tip edge in the direction toward the inside of the container 1.

[0035] [Configuration of Receiving Recess 47] 4 and 9, bottom wall portion 11A of bottom wall constituent portion 11 is provided with receiving recesses 47 that are recessed to receive each of cover protrusions 43 at the positions of the longitudinal side edges where the cover protrusions 43 face each other when the pair of second side wall portions 13 are in the folded position. Therefore, when the pair of second side wall portions 13 are in the folded position, each cover protrusion 43 is received in each receiving recess 47 of bottom wall portion 11A, and the pair of second side wall portions 13 abut against the upper surface of bottom wall portion 11A.

[0036] [Configuration of side wall overlap portion 13A] 8, the pair of second side wall portions 13 are provided with side wall overlapping portions 13A that protrude from the inner lower edge and the inner edge of the top surface of the pair of recesses 41. The side wall overlapping portions 13A are formed so as to fit into the auxiliary protrusions 18 of the bottom wall constituent portion 11 and the bottom wall overlapping portions 11D provided on the inner upper edge portions of the second base portion 11C when the container 1 is in an assembled state.

[0037] Note that protruding side wall overlapping portions 13A are also provided on the inner edges of the side surfaces of the pair of recesses 41. The side wall overlapping portions 13A on the side surfaces of the recesses 41 are formed so as to fit into notched bottom wall overlapping portions (see FIG. 5) extending in the height direction and provided on the inner edges of the surfaces of the auxiliary protrusions 18 that face the side surfaces of the recesses 41 when the container 1 is assembled (see FIG. 10). Therefore, when the container 1 is assembled, the side wall overlapping portions 13A of the pair of second side wall portions 13 face the auxiliary protrusions 18 and the bottom wall overlapping portions 11D of the second base portion 11C in the horizontal direction.

[0038] [Structure for sealing the corners of the assembled container 1] Next, the corners of the container 1 configured as described above in the assembled state will be described with reference to Figures 1, 6, 8, and 10 to 13. As shown in Figures 1 and 11, at each corner of the assembled container 1, the regulated walls 28 of the second side wall 13 abut against the inner surfaces of the regulating walls 24 of the first side wall 12, overlapping each other inward and outward to close the corner. Therefore, in the assembled state of the container 1, the corners facing the pair of regulating walls 24 of the first side wall 12 are closed by the regulated walls 28 abutting against the regulating walls 24 from the inside, preventing contents from spilling out of the container 1 and dust from entering the container 1.

[0039] 6, 8, 10, and 12, in the assembled state of the container 1, at the corners from the lower ends of the pair of restricting walls 24 of the first side wall 12 to the upper ends of the pair of recesses 35, the end faces on both sides of the second side wall 13 abut against or are close to the inner surface of the first side wall 12. Also, the pair of upper protrusions 38 of the first side wall 12 and the pair of cover protrusions 43 of the second side wall 13 abut against or are close to each other.

[0040] Therefore, when the container 1 is assembled, the corners from the lower ends of the pair of restricting walls 24 of the first side wall 12 to the upper ends of the pair of recesses 35 are blocked by the inner surface of the first side wall 12, the end faces on both sides of the second side wall 13, the upper protrusion 38, and the cover protrusion 43. This makes it possible to prevent contents from spilling out of the container 1 and dust from entering the container 1 at the corners from the lower ends of the pair of restricting walls 24 of the first side wall 12 to the upper ends of the pair of recesses 35.

[0041] 10 and 13, in the assembled state of the container 1, the corners from the upper ends of the recesses 35 provided on both longitudinal sides of the first side wall 12 to the lower ends of the both sides are in contact with or close to the pair of side protrusions 37 of the first side wall 12 and the pair of cover protrusions 43 of the second side wall 13. In addition, the side wall overlapping portions 12A protruding from the inner lower edges of the pair of first side walls 12 face horizontally against the bottom wall overlapping portion 11D provided on the inner upper edge of the first base portion 11B.

[0042] Additionally, the ceiling surfaces of the pair of recesses 41 of the second side wall portion 13 abut against or are close to the upper end surfaces of the auxiliary protrusions 18. The inner side surfaces of the pair of recesses 41 abut against or are close to the tip end surfaces of the auxiliary protrusions 18. Additionally, the side wall overlapping portions 13A provided on the inner edge of the top surfaces of the pair of recesses 41 face the bottom wall overlapping portion 11D provided on the inner upper edge of the auxiliary protrusion 18 in the horizontal direction.

[0043] Therefore, when the container 1 is assembled, the corners from the upper ends of the recesses 35 provided on both longitudinal side edges of the first side wall 12 to the lower ends of the both sides are blocked by the pair of side protrusions 37 of the first side wall 12 and the pair of cover protrusions 43 of the second side wall 13. This prevents contents from spilling out of the container 1 and dust from entering the container 1 at the corners from the upper ends of the recesses 35 provided on both longitudinal side edges of the first side wall 12 to the lower ends of the both sides. Furthermore, even if the recesses 35 become larger and the space between the upper end surfaces of the auxiliary protrusions 18 and the recesses 35 becomes larger, this can be blocked by increasing the lengths of the side protrusions 37 and the cover protrusions 43.

[0044] As described above in detail, in the container 1 according to this embodiment, when the container 1 is in an assembled state, the pair of side protrusions 37 and the pair of upper protrusions 38 of the first side wall 12 come into contact with or are close to the pair of cover protrusions 43 of the second side wall 13, thereby blocking the gap that communicates with the recesses 35 between the side walls at the corner. As a result, when the container 1 is in an assembled state, it is possible to prevent the contents from spilling out of the container 1 and the intrusion of dust and the like into the container 1.

[0045] Additionally, the pair of side protrusions 37 and the pair of upper protrusions 38 of the first side wall 12 have protrusion inclined surfaces 39, and the pair of cover protrusions 43 of the second side wall 13 have cover protrusion inclined surfaces 45. This makes it difficult for the contents to get caught on the cover protrusions 43, upper protrusions 38, and side protrusions 37 when putting contents into the container 1, preventing the contents from being scratched or broken.

[0046] Furthermore, when container 1 is in the folded state, the pair of cover protrusions 43 of the second side wall are received in receiving recesses 47, thereby reducing the overlap height between first side wall 12 and second side wall 13 in the folded state. As a result, the height of container 1 in the folded state can be reduced, allowing for space savings when storing container 1.

[0047] Furthermore, the first side wall portion 12 and the second side wall portion 13 and the bottom wall constituent portion 11, and further the cover protrusion 43 and the side protrusion 37 and the bottom wall constituent portion 11 overlap in the horizontal direction (inside and outside of the container 1) via the side wall overlapping portions 12A, 13A and the bottom wall overlapping portion 11D, thereby preventing gaps. In particular, at the lower ends of the pair of recesses 35 of the first side wall portion 12, the inner lower end edges of the cover protrusion 43 and the side protrusion 37 overlap with the bottom wall overlapping portion 11D, thereby reliably sealing the gap.

[0048] [Variations] A modification of the above embodiment will be described. In the following description, for the sake of convenience, the same reference numerals will be used to designate components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0049] [Variation 1] For example, the second base portion 11C may be higher than the first base portion 11B. Also, the formation position of the second bearing portion 16 may be located higher than the formation position of the first bearing portion 15. Four auxiliary protrusions 18 may be provided that protrude above the first base portion 11B from both end portions of the pair of second base portions 11C and are connected to the upper surface side of the first base portion 11B.

[0050] A pair of recesses 35 cut out in an L-shaped cross section may be provided at the lower ends of both side edges of the second side wall 13. A pair of side protrusions 37 and a pair of upper protrusions 38 may be provided along the side edges of the pair of recesses 35 of the second side wall 13. A pair of regulating walls 24 may be provided on the second side wall 13. A recess 41, a regulated wall 28, and a cover protrusion 43 may be provided on both longitudinal side edges of the first side wall 12.

[0051] In this configuration, when the assembled container 1 is to be folded, the pair of first side walls 12 are first brought to the folded position, and then the pair of second side walls 13 are displaced to the folded position. Therefore, when the container 1 is brought from the folded position to the assembled position, the pair of second side walls 13 are raised, and then the pair of first side walls 12 are raised to be in the assembled state.

[0052] Furthermore, when the container 1 is in an assembled state, the pair of side protrusions 37 and the pair of upper protrusions 38 of the second side wall 13 come into contact with or are close to the pair of cover protrusions 43 of the first side wall 12, thereby blocking the gap that communicates with the recesses 35 between the side walls at the corner. As a result, when the container 1 is in an assembled state, it is possible to prevent the contents from spilling out of the container 1 and the intrusion of dust and the like into the container 1.

[0053] [Variation 2] For example, when the container 1 is in the folded state, the pair of first side walls 12 or the pair of second side walls 13 may be arranged to overlap one another vertically. Furthermore, when the container 1 is in the folded state, the pair of first side walls 12 and the pair of second side walls 13 may be arranged to be inclined rather than parallel to the bottom wall 11A. [Explanation of symbols]

[0054] 1 container 11 Bottom wall component 11A Bottom wall part 11B First base 11C Second base 11D Bottom wall overlap part 12 First side wall portion 12A, 13A side wall overlap 13 Second side wall 18 Auxiliary protrusion 24 Restriction wall 28 Restricted wall section 35 recess 37 Side protrusion 38 Upper protrusion 39 Projection inclined surface 43 Cover protrusion 45 Cover protrusion inclined surface 47 Receptacle recess

Claims

1. a bottom wall component including a bottom wall portion having a generally rectangular shape in a plan view, a pair of first base portions respectively protruding upward from a pair of opposing side edges of the bottom wall portion, and a pair of second base portions respectively protruding upward from a pair of opposing side edges of the bottom wall portion and having a height lower than that of the first base portions; a first side wall portion rotatably connected to the first base portion; a second side wall portion rotatably connected to the second base portion; Equipped with the bottom wall constituent portion has auxiliary protrusions that protrude above the second base portion from both end portions of the pair of first base portions and are connected to the upper surface sides of the second base portions, The first side wall portion and the second side wall portion are capable of being turned into a folded state in which the first side wall portion and the second side wall portion are folded by rotating the first side wall portion and the second side wall portion inward, and an assembled state in which the first side wall portion and the second side wall portion are erected from the folded state, The first side wall portion is a pair of restricting walls protruding inward from both side edges of the inner surface; a pair of recesses capable of receiving the auxiliary protrusions in the folded state; a pair of side protrusions that protrude from an inner surface in a protruding direction of the restriction wall portion and are disposed on side edges of the recess that are inward relative to the restriction wall portion; a pair of upper protrusions provided continuously from the edges of the pair of side protrusions on the side of the restriction wall portion, protruding from inner surfaces in the protruding direction of the restriction wall portion, and disposed above the recess, The second side wall portion is a pair of restricted wall portions that abut on or are close to the restricting wall portion on both sides of an outer surface in the assembled state; a pair of cover protrusions formed to protrude inward from the inner surface, and capable of abutting or being close to inner surfaces of the pair of side protrusions and the pair of upper protrusions in the assembled state, thereby closing the pair of recesses; When changing from the folded state to the assembled state, the first side wall portion is first raised, and then the second side wall portion is raised to change to the assembled state. A container characterized by:

2. In the assembled state, the upper protrusion is inclined obliquely upward and outward toward the side edge of the first side wall portion, the side protrusions and the upper protrusions have protrusion inclined surfaces that are inclined so as to widen from their tip edges in a direction toward the inner surface of the first side wall portion in the assembled state, the cover protrusion has a cover protrusion inclined surface that is inclined such that an inner side surface thereof widens relative to an upper end surface and a side edge of the second side wall portion as it approaches the inner surface of the second side wall portion from a tip edge portion thereof in a direction toward the inward side in the assembled state; 2. The container of claim 1.

3. The bottom wall portion has a pair of receiving recesses that receive the pair of cover protrusions when the second side wall portion is in the folded state.

3. The container according to claim 1 or claim 2.

4. the first base portion and the auxiliary protrusion have bottom wall overlapping portions provided so as to form a step at their inner upper end edges, the first side wall portion and the second side wall portion have side wall overlapping portions at their inner lower end edges that protrude so as to fit into the step; In the assembled state, the bottom wall overlapping portion and the side wall overlapping portion face each other in the horizontal direction, the cover protrusion and the side protrusion have inner lower end edges that face the bottom wall overlapping portion in the horizontal direction; 3. The container according to claim 1 or 2.

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