Transport containers

Abstract

We propose a transport container that is less likely to collapse when stacked in multiple rows. [Solution] The transport container 1 is foldable and comprises a bottom wall 2, a side wall 3, a mouth frame 4 connected to the upper end of the side wall 3, and a lid 5 connected to the mouth frame 4. The side wall 3 is connected to the bottom wall 2 and separates the storage space formed above the bottom wall 2 from the external space to its side. The transport container 1 has an upper protrusion 14 that protrudes upward from an area having a predetermined shape and size and occupying a predetermined orientation at a predetermined position on the reference surface 13 of the upper surface of the lid 5 and the upper surface of the mouth frame 4 that constitute the upper surface of the transport container 1. In a plan view, the transport container 1 has a storage recess 26 that can accommodate the upper protrusion 14 from below, in an area that includes an area of ​​the same shape and size as the upper protrusion 14, occupying a predetermined orientation or an orientation rotated 90 degrees from the predetermined orientation, at a position shifted along one side of the bottom wall 2 from the position corresponding to the upper protrusion 14 on the lower surface of the bottom wall 2.

Description

【Technical Field】 【0001】 The present disclosure relates to a transport container. 【Background Art】 【0002】 Patent Document 1 describes a folding container. This folding container includes a pair of first side walls and a pair of second side walls whose side walls rising from a rectangular bottom wall face each other. After the pair of first side walls are folded, the remaining pair of second side walls are folded, so that the container changes from an assembled state in a box shape to a folded state in a flat plate shape. 【0003】 On both sides of the first side wall, there are provided rib protrusions that project in the thickness direction from the first side wall and are arranged inside the folding container rather than the first side wall in the assembled state, and extend vertically at least from a position near the upper end to a position near the lower end of the first side wall. 【0004】 In a portion overlapped with the rib protrusion in the folded state, or in a portion overlapped with the rib protrusion of the lower folding container when the folding containers in the folded state are stacked vertically, interference prevention recesses are formed to avoid interference with the rib protrusion. 【Prior Art Documents】 【Patent Documents】 【0005】 【Patent Document 1】 Japanese Patent No. 6537333 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0006】 In the folding container described in Patent Document 1, stacking in the vertical direction is possible. However, when multiple-stage stacking is performed, there is a risk that the upper folding container may shift horizontally with respect to the lower folding container, causing the load to collapse. 【0007】 The problem this disclosure aims to solve is to propose a transport container that is less prone to cargo collapse when stacked in multiple rows. [Means for solving the problem] 【0008】 A transport container according to one aspect of the present disclosure is foldable and comprises a bottom wall, a side wall, a mouth frame connected to the upper end of the side wall, and a lid connected to the mouth frame. The side wall is connected to the bottom wall and separates the storage space formed above the bottom wall from the external space to its side. The transport container has an upward projection that protrudes upward from an area having a predetermined shape and size and occupying a predetermined orientation at a predetermined position on a reference surface among the upper surface of the lid and the upper surface of the mouth frame that constitute the upper surface of the transport container. In a plan view, the transport container has a storage recess that can accommodate the upward projection from below, in an area that includes an area of ​​the same shape and size as the upward projection that occupies in the predetermined orientation or in an orientation rotated 90 degrees from the predetermined orientation, at a position shifted along one side of the bottom wall from a position on the lower surface of the bottom wall corresponding to the upward projection. [Effects of the Invention] 【0009】 The transport containers described herein are less prone to cargo collapse when stacked in multiple rows. [Brief explanation of the drawing] 【0010】 [Figure 1] Figure 1 is a perspective view of the transport container of the first embodiment with the lid closed. [Figure 2] Figure 2 is a partially exploded perspective view of the transport container shown above. [Figure 3] Figure 3 is a plan view of the transport container shown above. [Figure 4] Figure 4 is a bottom view of the transport container shown above. [Figure 5] Figure 5 is a side view showing the same transport containers stacked in multiple rows and multiple layers. [Figure 6] Figure 6 is a cross-sectional view of the main part of the transport containers described above, stacked in multiple rows and multiple layers. [Figure 7] Figure 7 is a perspective view of the transport container of the second embodiment with the lid closed. [Figure 8] Figure 8 is a partially exploded perspective view of the transport container shown above. [Figure 9] Figure 9 is a plan view of the transport container shown above. [Figure 10] Figure 10 is a bottom view of the transport container shown above. [Figure 11] Figure 11 is a side view showing the same transport containers stacked in multiple rows and multiple layers. [Figure 12] Figure 12 is a cross-sectional view of the main part of the transport containers described above, stacked in multiple rows and multiple layers. [Modes for carrying out the invention] 【0011】 The present invention relates to a transport container, and more particularly to a foldable transport container having a bottom wall, side walls, a top frame, and a lid. The transport container according to the present invention will be described below based on embodiments. 【0012】 (1) First Embodiment A first embodiment of the transport container 1 according to the present invention will be described below with reference to Figures 1 to 6. 【0013】 As shown in Figures 1 and 2, the transport container 1 is foldable and comprises a bottom wall 2, side walls 3, a mouth frame 4 connected to the upper end of the side wall 3, and a lid 5 connected to the mouth frame 4. The bottom wall 2, side walls 3, and mouth frame 4 constitute the container body 10. That is, the transport container 1 comprises the container body 10 and the lid 5. The bottom wall 2, mouth frame 4, side walls 3, and lid 5 are made of synthetic resin. Hereafter, regarding top and bottom, we will describe the top and bottom in the normal state of use, that is, the side where the mouth frame 4 is located will be considered top and the side where the bottom wall 2 is located will be considered bottom. Also, regarding inside and outside, the side away from the center of the transport container 1 will be considered outside and the side closer to the center will be considered inside. First, we will describe the basic configuration of the bottom wall 2, side walls 3, mouth frame 4, and lid 5, the assembled state of the transport container 1, and folding. 【0014】 (1.2) Bottom wall The bottom wall 2 has a rectangular shape in plan view (particularly a rectangular shape). For convenience, a pair of side portions (i.e., short side portions) facing the longitudinal direction 12 (the direction along the long side) in plan view are defined as the first side portions 21, and a pair of side portions (i.e., long side portions) facing the short transverse direction 11 (the direction along the short side) in plan view are defined as the second side portions 22. 【0015】 As shown in FIG. 4, the bottom wall 2 includes an outer edge rib 23, a lattice rib 24, and a wall rib 250 that constitutes the peripheral wall 25. The outer edge rib 23, the lattice rib 24, and the wall rib 250 are formed on the lower surface of the bottom wall 2. The lower surface of the bottom wall 2 is flat except for the portions where the outer edge rib 23, the lattice rib 24, and the wall rib 250 are formed. The outer edge rib 23, the lattice rib 24, and the wall rib 250 project downward from the flat lower surface of the bottom wall 2. 【0016】 (1.2.1) Outer edge rib The outer edge rib 23 projects downward with a predetermined protrusion height (the length from the lower surface of the bottom wall 2 to the lower end of the outer edge rib 23) from the lower surface of the bottom wall 2 and has an annular shape in plan view. In the first embodiment, the outer edge rib 23 is an annular rib having a substantially rectangular shape along the edge of the lower surface of the bottom wall 2. The outer edge rib 23 is located at the outer edge portion that constitutes the outer contour of the portion that contacts the plane when the transport container 1 is placed on a plane such as a floor surface. Ribs may project downward from a position outside the outer edge rib 23 on the lower surface of the bottom wall 2, but the ribs located outside the outer edge rib 23 do not contact the plane when the transport container 1 is placed on the plane. The portion inside the outer edge rib 23 on the lower surface of the bottom wall 2 is defined as the inner region of the outer edge rib. A storage region described later is formed in a part of the inner region of the outer edge rib, and the later-described lattice rib region is formed in the remaining part. 【0017】 (1.2.2) Lattice rib The lattice ribs 24 are grid-like in plan view and protrude downward from the lower surface of the bottom wall 2 by a predetermined protrusion height (length from the lower surface of the bottom wall 2 to the lower end of the lattice rib 24). In the first embodiment, the lattice ribs 24 have a plurality of first rib pieces 241 that are parallel to each other, and a plurality of second rib pieces 242 that are perpendicular to the first rib pieces 241 and parallel to each other. The plurality of first rib pieces 241 are arranged at equal intervals, and the plurality of second rib pieces 242 are also arranged at equal intervals. The plurality of first rib pieces 241 extend in directions that form a 45-degree angle with respect to the short direction 11 and the long direction 12, and the plurality of second rib pieces 242 extend in directions that form a 45-degree angle with respect to the long direction 12 and the short direction 11. The protrusion height of the lattice ribs 24 is the same as the protrusion height of the outer edge ribs 23. 【0018】 The grid ribs 24 are formed in the grid rib region within the outer edge rib region. The grid rib region is composed of part or all of the outer edge rib region excluding the storage region described later. 【0019】 The grid ribs 24 are located on the outer edge of the outer casing that comes into contact with the surface when the transport container 1 is placed on a flat surface such as a floor. The outer edge ribs 23 and the grid ribs 24 constitute the bottom ribs. 【0020】 (1.2.3) Wall ribs The wall ribs 250 constituting the peripheral wall 25 are annular in plan view and protrude downward from the lower surface of the bottom wall 2 by a predetermined protrusion height (length from the lower surface of the bottom wall 2 to the lower end of the wall rib 250). In the first embodiment, the wall ribs 250 are annular in plan view with a rectangular shape. The protrusion height of the wall ribs 250 is the same as the protrusion height of the bottom ribs (outer edge ribs 23 and grid ribs 24). 【0021】 The wall ribs 250 have four wall ribs 251 to 254, each located on one side of the peripheral wall 25. With respect to the center 20 of the bottom wall 2 in plan view, wall rib 251 is located on one side of the short direction 11 and extends along the long direction 12; wall rib 252 is located on one side of the long direction 12 and extends along the reference plane 13; wall rib 253 is located on the other side of the short direction 11 and extends along the long direction 12; and wall rib 254 is located on the other side of the long direction 12 and extends along the reference plane 13. At least one pair of opposing wall ribs 251 and 253 are connected to a bottom rib (lattice rib 24). The wall ribs 250 are formed on the periphery of the storage area. In other words, in plan view, the area inside the wall ribs 250 on the lower surface of the bottom wall 2 constitutes the storage area. 【0022】 The storage area is formed in a part of the outer rib interior area. The storage area is formed at least in the central part of the short direction 11 of the outer rib interior area, extending substantially along the entire length in the longitudinal direction 12. In the first embodiment, the storage area is formed in only one location within the outer rib interior area. The storage area is surrounded by the peripheral wall 25 (wall rib 250), thereby forming a storage recess 26 inside it. The storage recess 26 will be described later. 【0023】 (1.3) Side wall The side wall 3 is connected to the bottom wall 2 and separates the storage space formed above the bottom wall 2 from the external space to its side. The side wall 3 has a pair of first side walls 6 provided along the first edges 21, 21 of the bottom wall 2 and the opening frame 4, and a pair of second side walls 7 provided along the second edges 22, 22 of the bottom wall 2 and the opening frame 4. 【0024】 (1.3.1) First side wall The first side wall 6 is formed such that its length in the lateral direction (horizontal direction) is approximately the same as the length of the first sides 21, 21 of the bottom wall 2 and the opening frame 4. In the first embodiment, the first side wall 6 is formed in a rectangular shape when viewed from the front, with its vertical length being shorter than its horizontal length. 【0025】 As shown in Figure 2, the upper end of the first side wall 6 is rotatably connected to the first side portion 41 of the mouth frame 4. In the first embodiment, a shaft portion 61 provided at the upper end of the first side wall 6 is pivotally supported by a bearing portion (not shown) provided on the first side portion 41 of the mouth frame 4, so that the first side wall 6 is rotatable relative to the mouth frame 4. Note that the connection of the first side wall 6 to the mouth frame 4 is not limited to this form; it is sufficient that the first side wall 6 is rotatable relative to the mouth frame 4. 【0026】 Furthermore, the lower end of the first side wall 6 is detachable from the first side portion 21 of the bottom wall 2. 【0027】 (1.3.2) Second side wall The second side wall 7 is formed so that its lateral length is approximately the same as the length of the second sides 22, 22 of the bottom wall 2 and the opening frame 4. In the first embodiment, the second side wall 7 is formed in a rectangular shape when viewed from the front, with a vertical length shorter than its lateral length. The second side wall 7 is divided into two parts vertically: an upper wall 71 and a lower wall 72. 【0028】 The upper wall 71 is rotatably connected at its upper end to the second side portion 42 of the mouth frame 4. In the first embodiment, a shaft portion 711 provided at the upper end of the upper wall 71 is pivotally supported by a bearing portion (not shown) provided on the second side portion 42 of the mouth frame 4, so that the upper wall 71 is rotatable relative to the mouth frame 4. Note that the connection of the upper wall 71 to the mouth frame 4 is not limited to this form; it is sufficient that the upper wall 71 is rotatable relative to the mouth frame 4. 【0029】 The lower end of the lower wall 72 is rotatably connected to the second side portion 22 of the bottom wall 2. In the first embodiment, a shaft portion 721 provided at the lower end of the lower wall 72 is connected to a bearing portion 221 provided on the second side portion 22 of the bottom wall 2, and the lower wall 72 is rotatable relative to the bottom wall 2. Note that the connection of the lower wall 72 to the bottom wall 2 is not limited to this form; it is sufficient that the lower wall 72 is rotatable relative to the bottom wall 2. 【0030】 Furthermore, the lower end of the upper wall 71 and the upper end of the lower wall 72 are rotatably connected. As shown in Figure 1, in the first embodiment, a shaft portion 712 provided at the lower end of the upper wall 71 is pivotally supported by a bearing portion 722 provided at the upper end of the lower wall 72, and a shaft portion 723 provided at the upper end of the lower wall 72 is pivotally supported by a bearing portion 713 provided at the lower end of the upper wall 71, so that the upper wall 71 and the lower wall 72 can rotate relative to each other. Note that the connection between the upper wall 71 and the lower wall 72 is not limited to this form; it is sufficient that the upper wall 71 and the lower wall 72 can rotate relative to each other. 【0031】 (1.4) Opening The opening frame 4 has a rectangular ring shape (particularly rectangular) in plan view, and its outer shape in plan view is formed to be approximately the same as the outer shape of the bottom wall 2 in plan view, and its size is also approximately the same. The opening frame 4 has a vertical penetration inside, and this penetration serves as the opening for loading and unloading contents into the assembled transport container 1. For convenience, similar to the bottom wall 2, the opening frame 4 has a pair of sides (i.e., short sides) facing the longitudinal direction 12 in plan view designated as the first side 41, and a pair of sides (i.e., long sides) facing the short direction 11 in plan view designated as the second side 42. 【0032】 Furthermore, the frame 4 is provided with a frame hinge portion 43, which serves as a hinge portion that rotatably connects the lid 5 and the frame 4. The frame hinge portion 43 protrudes upward from the upper surface of the second side portion 42. The frame 4 also has a frame positioning projection 44 for determining its relative position with respect to the lid 5. The frame positioning projection 44 protrudes upward from the upper surface of the first side portion 41. When multiple transport containers 1 are stacked in a row, the frame positioning projections 44, 44 of the lower transport container 1 are positioned outside the longitudinal direction 12 of the outer edge ribs 23, 23 along the short direction 11 of the upper transport container 1, thereby restricting their relative movement in the longitudinal direction 12. In the stacked configuration, the gap between the outer edge rib 23 along the shorter side 11 of the upper transport container 1 and the mouth frame positioning projection 44 of the lower container is preferably, for example, 2 mm to 10 mm (particularly 2 mm to 5 mm). The mouth frame hinge portion 43 and the mouth frame positioning projection 44 will be described later. 【0033】 (1.5) Lid The lid 5 is rectangular in plan view (particularly rectangular), and its outer shape in plan view is formed to be approximately the same as the outer shape of the bottom wall 2 and the outer shape of the opening frame 4 in plan view, and its size is also approximately the same. In the first embodiment, the lid 5 is composed of a first lid 51 and a second lid 52 which are divided in the short direction 11. 【0034】 The first lid 51 is located on one side in the short direction 11, and the second lid 52 is located on the other side in the short direction 11. The first lid 51 and the second lid 52 are identical objects. 【0035】 The first lid 51 has an edge that runs along the second edge 42 of the frame 4, and this edge is rotatably connected to the second edge 42 of the frame 4. The lid 5 is provided with a lid hinge portion 55, which serves as a hinge portion that rotatably connects the lid 5 and the frame 4. As shown in Figure 2, in the first embodiment, the shaft portion 53 of the lid hinge portion 55, which is provided at the lower end of the first lid 51, is pivotally supported by the bearing portion 421 of the frame hinge portion 43, which is provided at the upper end of the second edge 42 of the frame 4. Furthermore, the shaft portion 422 of the frame hinge portion 43, which is provided at the upper end of the second edge 42 of the frame 4, is pivotally supported by the bearing portion 54 of the lid hinge portion 55, which is provided at the lower end of the first lid 51, so that the first lid 51 and the second edge 42 of the frame 4 can rotate relative to each other. The connection between the first lid 51 and the second side portion 42 of the frame 4 is not limited to this configuration; it is sufficient if the first lid 51 and the second side portion 42 of the frame 4 are rotatable relative to each other. The second lid 52 is also rotatably connected to the frame 4 in the same way as the first lid 51. 【0036】 Furthermore, the lid 5 has a lid positioning opening 56 through which the frame positioning projection 44 of the frame 4 is inserted. The lid hinge portion 55 and the lid positioning opening 56 will be described later. 【0037】 (1.6) Assembled and folded state of the transport container The above describes the general outline of the transport container 1, which can be configured in either an assembled or folded state. 【0038】 The assembled state is when the lower end of the first side wall 6 is attached to the first edge 21 of the bottom wall 2, causing the first side wall 6 to stand upright, and the upper wall 71 and lower wall 72 of the second side wall 7 extend vertically, causing the second side wall 7 to stand upright, and a storage space is formed inside (see Figure 1). 【0039】 The folded state is a state in which the lower end of the first side wall 6 separates from the first edge 21 of the bottom wall 2, so that the first side wall 6 is horizontal along the opening frame 4, and the upper wall 71 and lower wall 72 of the second side wall 7 are folded so that they overlap, so that the second side wall 7 is lying down on the bottom wall 2, and no storage space is formed inside. 【0040】 The lower end of the first side wall 6 is detachable from the first side portion 21 of the bottom wall 2. In the assembled state, it is attached to the first side portion 21 of the bottom wall 2, causing the first side wall 6 to stand upright, and is locked to maintain this upright position. In the folded state, the lower end of the first side wall 6 detaches from the first side portion 21 of the bottom wall 2, allowing the first side wall 6 to fold down onto the bottom wall 2. 【0041】 (1.7) Upper convex part As shown in Figures 1 to 3, the transport container 1 has an upward projection 14 that protrudes upward from the reference surface 13. The reference surface 13 is a part of the upper surface of the lid 5 and the upper surface of the opening frame 4 that constitute the upper surface of the transport container 1, and is the part that forms the widest coplanar surface of the upper surface of the transport container 1. In the first embodiment, the reference surface 13 is the part that forms the widest coplanar surface of the upper surface of the lid 5 (first lid 51 and second lid 52). 【0042】 The upper protrusion 14 projects upward in a region that occupies a predetermined position on the reference surface 13, having a predetermined shape and size and in a predetermined orientation. The upper protrusion 14 is usually part of the frame 4 and the lid 5, but may also include parts other than the frame 4 and the lid 5. In the first embodiment, the transport container 1 has, as the upper protrusion 14, the frame hinge portion 43 described above that projects upward from the upper surface of the second side portion 42 of the frame 4, and the frame positioning protrusion 44 described above that projects upward from the upper surface of the first side portion 41 of the frame 4. The transport container 1 also has, as the upper protrusion 14, the lid hinge portion 55 described above that projects upward from the portion of the upper surface of the lid 5 corresponding to the frame hinge portion 43. The frame hinge portion 43 and the lid hinge portion 55 constitute the hinge portion (see Figure 1). The hinge portion is formed at a predetermined position, that is, at both ends of the short side direction 11 on the upper surface of the transport container 1, in a predetermined shape and size, that is, rectangular in shape with a predetermined width and length in a plan view, and in a predetermined orientation, that is, with the longitudinal direction 12 as the longitudinal direction. 【0043】 The upper protrusion 14 does not necessarily have to be connected to the reference surface 13. In other words, the member having the reference surface 13 and the upper protrusion 14 do not have to be integral. In the first embodiment, the mouth frame hinge portion 43 and the mouth frame positioning protrusion 44 are part of the mouth frame 4 and are separate from the lid 5 having the reference surface 13. 【0044】 (1.8) Storage recess As shown in Figure 4, the transport container 1 has the storage recess 26 described above. The storage recess 26 is configured to accommodate part or all of the upper protrusion 14 from below. In the first embodiment, the storage recess 26 is configured to accommodate a hinge portion, which is composed of a mouth frame hinge portion 43 and a lid hinge portion 55, as the upper protrusion 14. 【0045】 The storage recess 26 has a rectangular shape in plan view. The peripheral wall 25 is rectangular in plan view and protrudes downward from the lower surface of the bottom wall 2, surrounding the storage recess 26. In plan view, the storage recess 26 is formed so that the upper protrusion 14 can be stored in a region that includes a region identical in shape and size to the upper protrusion 14, located at a position shifted along one side of the bottom wall 2 from a position corresponding to the upper protrusion 14 on the lower surface of the bottom wall 2, and occupies a predetermined orientation (in the first embodiment, with the longitudinal direction 12 as the longitudinal direction). 【0046】 In the first embodiment, one side is the first side portion 21, but one side may also be the second side portion 22. Furthermore, the upper protrusion 14 that the storage recess 26 is intended to store is the hinge portion of the frame hinge portion 43 and the lid hinge portion 55, among the frame hinge portion 43, frame positioning protrusion 44, and lid hinge portion 55. Furthermore, the region including the region occupied by a region identical in shape and size to the upper protrusion 14 in a predetermined orientation may be the same region as the region occupied by a region identical in shape and size to the upper protrusion 14 in a predetermined orientation, but it is preferable that it substantially includes the region occupied by a region identical in shape and size to the upper protrusion 14 in a predetermined orientation and is larger than this region. To further explain, as shown in Figure 5, the transport containers 1 are stacked in two rows of two layers, and then another transport container 1 is stacked across the top layer of the transport containers 1, 1 in the two rows of two layers, for a total of three layers. 【0047】 At this time, the two transport containers 1 at the bottom are placed on the floor or pallet in the same orientation (so that their respective short sides 11 (or long side 12) coincide) with their second sides 22 adjacent to each other, with the centers 20 (see Figure 4) of the bottom walls 2 of each transport container 1 shifted in the short side direction 11 by the length of the transport container 1. 【0048】 Furthermore, in order to place the middle transport container 1 on the bottom transport container 1, they are placed in the same position and orientation, that is, so that they overlap in a plan view; in other words, the centers 20 of the bottom walls 2 of each transport container 1 overlap and are placed in the same orientation. 【0049】 Furthermore, in order to place the uppermost (hereinafter referred to as "upper") transport container 1 on the middle (hereinafter referred to as "lower") transport container 1, in a plan view, the upper transport container 1 is placed at a position where the center 20 of the lower transport container 1 is moved from the center 20 of the lower transport container 1 to the center 20 of the upper transport container 1 in the short-side direction 11 by half the length of the short-side direction 11 of the transport container 1, and is oriented in the same direction as the lower transport container 1. 【0050】 At this time, as shown in Figure 6, the upper protrusions 14, 14, consisting of the mouth frame hinge portion 43 and lid hinge portion 55 of the adjacent lower transport container 1, are stored side by side in the storage recess 26 on the lower surface of the bottom wall 2 of the upper transport container 1, and are placed on the ceiling surface (lower surface) of the storage recess 26. Also, the bottom ribs (outer edge ribs 23 and lattice ribs 24) of the upper transport container 1 do not come into contact with the upper surface (upper surface of the lid 5) of the lower transport container 1. In addition, a gap L26 is formed between the inner surface of the wall ribs 250 (wall ribs 251-254) and the upper protrusions 14. The gap L26 is preferably 1-3 mm (particularly 2 mm), but is not particularly limited. It is preferable that the gap L26 is smaller than the gap between the outer edge ribs 23 along the short side direction 11 of the stacked upper transport container 1 and the mouth frame positioning protrusion 44 of the lower container (for example, 2 mm or more and 10 mm or less as described above). 【0051】 As a result, the upper protrusion 14 of the lower transport container 1 is stored in the storage recess 26 of the upper transport container 1, preventing it from falling out of the storage recess 26. Consequently, the upper transport container 1 shown in Figure 5 prevents the lower transport containers 1 from separating and causing the stacked transport containers 1 to collapse. 【0052】 Since no ribs are formed in the storage recess 26, the bending rigidity, bending strength, and impact resistance of the bottom wall 2 are weak in this area. In the first embodiment, since bottom ribs (lattice ribs 24) are connected to all of the wall ribs 251 to 254, the bending rigidity, bending strength, and impact resistance of the bottom wall 2 near the storage recess 26 can be reinforced. As shown in Figure 6, the thickness T25 of the wall rib 250 (width in a cross-section perpendicular to the direction in which the wall rib 250 extends) is formed to be the same as the thickness of the outer edge rib 23. 【0053】 No notches are formed in the wall ribs 250 (wall ribs 251-254). This suppresses a decrease in the bending rigidity, bending strength, and impact resistance of the peripheral wall 25. 【0054】 In the transport container 1, no injection molding gate marks are formed in the storage recess 26, while gate marks are formed in areas other than the storage recess 26. For example, if a gate mark is formed on the ceiling surface of the storage recess 26, when stacking, the upper protrusion 14 of the lower transport container 1 will collide with the gate mark formed on the ceiling surface of the storage recess 26 of the upper transport container 1, making the bottom wall 2 prone to damage from this point. By not forming a gate mark in the storage recess 26, such damage to the bottom wall 2 can be prevented. 【0055】 (2) Second Embodiment A second embodiment of the transport container 1 according to the present invention will be described below with reference to Figures 7 to 12. 【0056】 As shown in Figures 7 and 8, the transport container 1 is largely the same as in the first embodiment, including the fact that it is foldable and has a bottom wall 2, side walls 3, a mouth frame 4, and a lid 5. In the second embodiment, the bottom wall 2 and side walls 3 (first side wall 6 and second side wall 7) are the same as the bottom wall 2 and side walls 3 of the first embodiment, while the mouth frame 4 and lid 5 differ from those of the first embodiment. Hereinafter, the same components as in the first embodiment will be denoted by the same reference numerals and their descriptions will be omitted to avoid repetition, and the differences will be described mainly. 【0057】 (2.1) Lid The lid 5 is rectangular in plan view (particularly rectangular), and its outer shape in plan view is formed to be substantially the same as the outer shape of the bottom wall 2 and the outer shape of the opening frame 4 in plan view, and its size is also substantially the same. In the second embodiment, the lid 5 is composed of a first lid 51 and a second lid 52 which are divided in the longitudinal direction 12 (short direction 11 in the first embodiment). 【0058】 The first lid 51 is located on one side of the longitudinal direction 12, and the second lid 52 is located on the other side of the longitudinal direction 12. The first lid 51 and the second lid 52 are identical objects. 【0059】 The first lid 51 has an edge that runs along the first edge 41 (second edge 42 in the first embodiment) of the frame 4, and is rotatably connected to the first edge 41 of the frame 4. The lid 5 is provided with a lid hinge portion 55. As shown in Figure 8, in the second embodiment, the shaft portion 53 of the lid hinge portion 55, which is provided at the lower end of the first lid 51, is pivotally supported by the bearing portion 411 of the frame hinge portion 43, which is provided at the upper end of the second edge 42 of the frame 4. Furthermore, the shaft portion 412 of the frame hinge portion 43, which is provided at the upper end of the first edge 41 of the frame 4, is pivotally supported by the bearing portion 54 of the lid hinge portion 55, which is provided at the lower end of the first lid 51, so that the first lid 51 and the first edge 41 of the frame 4 can rotate relative to each other. The connection between the first lid 51 and the first side portion 41 of the frame 4 is not limited to this configuration; it is sufficient if the first lid 51 and the first side portion 41 of the frame 4 are rotatable relative to each other. The second lid 52 is also rotatably connected to the frame 4 in the same manner as the first lid 51. 【0060】 Furthermore, the lid 5 has a lid positioning opening 56 through which the frame positioning projection 44 is inserted. 【0061】 (2.2) Opening frame The opening frame 4 has a rectangular ring shape (particularly rectangular) in plan view, and its outer shape in plan view is formed to be approximately the same as the outer shape of the bottom wall 2 in plan view, and its size is also approximately the same. The opening frame hinge portion 43 protrudes upward from the upper surface of the first side portion 41. The opening frame positioning projection 44 protrudes upward from the upper surface of the second side portion 42. The opening frame positioning projection 44 is provided at two locations in the longitudinal direction 12. 【0062】 (2.3) Upper convex part As shown in Figures 7 to 9, in the second embodiment, the reference surface 13 is the portion of the upper surface of the lid 5 (first lid 51 and second lid 52) that forms the widest coplanar plane. In the second embodiment, the transport container 1 has an upper protrusion 14 which includes the aforementioned lid hinge portion 43 that protrudes upward from the upper surface of the first side portion 41 of the lid frame 4, and the aforementioned lid positioning protrusion 44 that protrudes upward from the upper surface of the second side portion 42 of the lid frame 4. The transport container 1 also has an upper protrusion 14 which includes the aforementioned lid hinge portion 55 that protrudes upward from the portion of the upper surface of the lid 5 corresponding to the lid hinge portion 43. 【0063】 (2.4) Storage recess As shown in Figure 10, in the second embodiment, the storage recess 26 is configured such that the hinge portion, which is formed by the mouth frame positioning protrusion 44, can be stored as the upper protrusion 14. 【0064】 The storage recess 26 has a rectangular shape in plan view. The peripheral wall 25 is rectangular in plan view and protrudes downward from the lower surface of the bottom wall 2, surrounding the storage recess 26. The storage recess 26 is provided at two locations in the longitudinal direction 12, corresponding to the opening frame positioning projection 44. In plan view, the storage recess 26 is formed so that the upper projection 14 can be stored in a region that includes a region identical in shape and size to the upper projection 14 and occupies a predetermined orientation, at a position shifted along one side of the bottom wall 2 from the position corresponding to the upper projection 14 on the lower surface of the bottom wall 2. 【0065】 As shown in Figure 12, in the transport container 1, similar to the first embodiment, the upper protrusions 14, 14, which consist of the mouth frame positioning protrusions 44 of the adjacent lower transport container 1, are stored side by side in the storage recess 26 on the lower surface of the bottom wall 2 of the upper transport container 1, and are placed on the ceiling surface (lower surface) of the storage recess 26. Also, the bottom ribs (outer edge ribs 23 and lattice ribs 24) of the upper transport container 1 do not come into contact with the upper surface (upper surface of the lid 5) of the lower transport container 1. Furthermore, a gap L26 is formed between the inner surface of the wall ribs 250 (wall ribs 251-254) and the upper protrusions 14. The gap L26 is preferably 1-3 mm (particularly 2 mm), but is not particularly limited. 【0066】 As a result, similar to the first embodiment, the upper protrusion 14 of the lower transport container 1 is stored in the storage recess 26 of the upper transport container 1, preventing it from falling out of the storage recess 26. As a result, it is possible to prevent the situation in which the upper transport container 1 shown in Figure 11 causes the lower transport containers 1 to separate and the stacked transport containers 1 to collapse. 【0067】 Since no ribs are formed in the storage recess 26, the bending rigidity, bending strength, and impact resistance of the bottom wall 2 are weak in this area. In the second embodiment, since the bottom ribs (lattice ribs 24) are connected to all of the wall ribs 251254, the bending rigidity, bending strength, and impact resistance of the bottom wall 2 near the storage recess 26 can be reinforced. The thickness T25 of the wall rib 250 may be formed to be the same as the thickness of the outer edge rib 23. 【0068】 No notches are formed in the wall ribs 250 (wall ribs 251-254). This suppresses a decrease in the bending rigidity, bending strength, and impact resistance of the peripheral wall 25. 【0069】 In the second embodiment as well, no injection molding gate marks are formed in the storage recess 26 of the transport container 1. 【0070】 (3) Variant In the above embodiment, the bottom wall 2 is rectangular in plan view, but it may also be square. 【0071】 In the above embodiment, the outer frame 4 has a rectangular shape when viewed from above, but the outer frame may also have a square shape. 【0072】 In the above embodiment, the bottom wall 2 and the opening frame 4 have their short sides designated as first sides 21, 21 and their long sides designated as second sides 22, 22, but the short sides may be designated as second sides and the long sides as first sides. 【0073】 In the above embodiment, the first side wall 6 is rectangular in shape when viewed from the front, but it may also be square in shape when viewed from the front. 【0074】 In the above embodiment, the second side wall 7 is rectangular in shape when viewed from the front, but it may also be square in shape when viewed from the front. 【0075】 The lower surface of the bottom wall 2 may be a perfectly flat surface, but it does not have to be a perfectly flat surface; it may be curved in some parts, or have recesses, protrusions, or through holes in some parts. 【0076】 The reference surface 13 does not have to be the widest, most coplanar portion of the upper surface of the transport container 1. The reference surface 13 may consist only of the upper surface of the lid 5, or only of the upper surface of the frame 4, or of the upper surface of the frame 4 and the lid 5, or it may include surfaces other than the frame 4 and the lid 5. 【0077】 The hinge portion, which serves as the upper protrusion 14 housed in the storage recess 26, is not necessarily formed on both the lid 5 and the frame 4, but may be formed on either the lid 5 or the frame 4, i.e., only the lid 5 or only the frame 4. 【0078】 The positioning projection, which serves as the upper projection 14 housed in the storage recess 26, is not necessarily formed on both the lid 5 and the frame 4, but may be formed on only one of them, i.e., only the lid 5 or only the frame 4. 【0079】 The shape of the storage recess 26 in plan view is not limited to a rectangular shape. 【0080】 The gap L26 is not necessarily required. 【0081】 The thickness T25 of the wall rib 250 may be greater than or less than the thickness of the outer edge rib 23. 【0082】 The thickness of the outer edge rib 23 may be the same as the thickness of the grid rib 24, or it may be thicker or thinner than the grid rib 24. 【0083】 The protruding height of the outer edge rib 23 may be higher or lower than the protruding height of the grid rib 24. The protruding height of the wall rib 250 may be higher or lower than the protruding height of the bottom rib (outer edge rib 23 and grid rib 24). 【0084】 The thickness T25 of wall rib 250 may be the same for all wall ribs 251 to 254, or the thickness T25 of wall rib 251 and wall rib 253 may be thicker or thinner than the thickness T25 of wall rib 252 and wall rib 254. 【0085】 At least, it is preferable that no notches are formed in the wall ribs 252 and 254 on the short side. It is also preferable that no notches are formed in the wall ribs 251 and 253 on the long side, although notches may be formed therein. Furthermore, even in the wall ribs 252 and 254 on the short side, minute notches may be formed. 【0086】 The number of storage recesses 26 formed in the bottom wall 2 (transport container 1) is not limited to one. Depending on the shape, size, number, etc. of the upper protrusions 14, an appropriate number of storage recesses 26 may be formed. Furthermore, the shape and size of the storage recesses 26 are not limited. 【0087】 Reinforcement ribs similar to the outer edge ribs 23 (for example, with the same protrusion height and thickness as the outer edge ribs 23) may be formed on the ceiling surface (bottom surface) of the storage recess 26 for reinforcement. Alternatively, thread ribs may be formed on the ceiling surface (bottom surface) of the storage recess 26 for reinforcement. 【0088】 The inner surface of the wall rib 250 may have an inclined surface that slopes away from the center of the storage recess 26 as it approaches the tip (downward) end. Such an inclined surface guides the upper protrusion 14 into the storage recess 26. 【0089】 The inner surface of the wall rib 250 may have a vertical surface in addition to an inclined surface. Of the inner surface of the wall rib 250, the side with the base protruding from the bottom wall 2 is a vertical surface, and the side with the tip is an inclined surface. 【0090】 As a result, the base end of the wall rib 250 is made thick to ensure rigidity and strength, while the tip end is made into an inclined surface that guides the upper protrusion 14 into the storage recess 26. 【0091】 It is preferable that at least one pair of opposing wall ribs 251, 253 (or 252, 254) among the wall ribs 250 (251-254) are connected to the bottom ribs (lattice ribs 24), but it is not necessary for the bottom ribs to be connected to all wall ribs 250 (251-254). Furthermore, the bottom ribs may be connected to any one of the wall ribs 250 (251-254), or to any three of the wall ribs 250. 【0092】 In the above embodiments, the storage recess 26 was formed in a region that included an area occupied by a region identical in shape and size to the upper protrusion 14 in a predetermined orientation (with the longitudinal direction 12 as the longitudinal direction). In contrast, the storage recess 26 may be formed in a region that includes an area occupied by a region identical in shape and size to the upper protrusion 14 in an orientation rotated 90 degrees from the predetermined orientation (with the short direction 11 as the longitudinal direction). For example, in the transport container 1 shown in Figure 10, the two storage recesses 26 may be formed on the lower surface of the bottom wall 2, rotated 90 degrees around the center 20 as the center of rotation. This allows the top transport container 1 to be placed on top of the transport containers 1 arranged in the layers below it, rotated 90 degrees, when stacked in the layer shown in Figure 11. 【0093】 (4) Summary As is clear from the first embodiment, the second embodiment and its modifications described above, the transport container 1 of the first embodiment is foldable and comprises a bottom wall 2, a side wall 3, a mouth frame 4 connected to the upper end of the side wall 3, and a lid 5 connected to the mouth frame 4. The side wall 3 is connected to the bottom wall 2 and separates the storage space formed above the bottom wall 2 from the external space to its side. The transport container 1 has an upper protrusion 14 that protrudes upward from an area having a predetermined shape and size and occupying a predetermined orientation at a predetermined position on the reference surface 13 of the upper surface of the lid 5 and the upper surface of the mouth frame 4 that constitute the upper surface of the transport container 1. In a plan view, the transport container 1 has a storage recess 26 that can accommodate the upper protrusion 14 from below, in an area that includes an area of ​​the same shape and size as the upper protrusion 14, occupying a predetermined orientation or an orientation rotated 90 degrees from the predetermined orientation, at a position shifted along one side of the bottom wall 2 from the position corresponding to the upper protrusion 14 on the lower surface of the bottom wall 2. 【0094】 According to the first embodiment, when another transport container 1 is placed on top of two stacked transport containers 1, the upper protrusions 14 of the transport containers 1, 1 lined up below it are stored in the storage recesses 26 of the transport container 1 placed on top of it, thereby preventing the lined up transport containers 1, 1 from separating and collapsing. 【0095】 In the second embodiment, the invention is realized by combining it with the first embodiment. In the second embodiment, the storage recess 26 is rectangular in plan view. The bottom wall 2 has a peripheral wall 25 that protrudes downward from the lower surface and surrounds the storage recess 26, and is rectangular in plan view. At least one pair of opposing wall ribs 251, 253 of the four wall ribs 250 (wall ribs 251 to wall ribs 254) located on each side of the peripheral wall 25 are connected to bottom ribs (lattice ribs 24) that protrude downward from the lower surface of the bottom wall 2 excluding the storage recess 26. 【0096】 According to the second embodiment, the bending rigidity, bending strength, and impact resistance of the bottom wall 2 near the storage recess 26 can be reinforced. 【0097】 In the third embodiment, this is realized by a combination of the first or second embodiment. In the third embodiment, the upper protrusion 14 is a hinge portion (frame hinge portion 43, lid hinge portion 55) formed on one or both of the lid 5 and the frame 4 to rotatably connect the lid 5 and the frame 4. 【0098】 According to the third embodiment, the hinge portion can be used as the upper protrusion 14, and there is no need to provide a special configuration for the upper protrusion 14. 【0099】 In the fourth embodiment, this is realized by a combination with the first or second embodiment. In the fourth embodiment, the upper protrusion 14 is a positioning protrusion (frame positioning protrusion 44) formed on one or both of the lid 5 and the frame 4 to determine the relative position of the lid 5 and the frame 4. 【0100】 According to the fourth embodiment, the positioning projection can be used as the upper projection 14, and there is no need to provide a special configuration for the upper projection 14. [Explanation of Symbols] 【0101】 1. Transport container 10 Container body 11 Short direction 12 Longitudinal direction 2 Bottom wall 21 First side 22 Second side 3 side wall 4-entry frame 41 First side 42 Second side 5 Lid 51 First lid body 52 Second lid body 6 First side wall 7 Second side wall 71 Upper wall 72 Lower wall T25 Thickness L26 Gap

Claims

[Claim 1] A foldable transport container comprising a bottom wall, a side wall connected to the bottom wall and separating the storage space formed above the bottom wall from the external space to its side, a mouth frame connected to the upper end of the side wall, and a lid connected to the mouth frame, The upper surface of the transport container has an upward projection that protrudes upward from an area having a predetermined shape and size and in a predetermined orientation at a predetermined position on the reference surface of the upper surface of the lid and the upper surface of the frame, which constitute the upper surface of the transport container. In a plan view, at a position offset along one side of the bottom wall from the position corresponding to the upper protrusion on the lower surface of the bottom wall, the bottom wall has a storage recess in which the upper protrusion can be housed from below, in a region that includes a region identical in shape and size to the upper protrusion, which occupies the region in the predetermined orientation or in an orientation rotated 90 degrees from the predetermined orientation. A transport container characterized by the following features. [Claim 2] The aforementioned storage recess is rectangular in plan view. The lower surface of the bottom wall has a peripheral wall that protrudes downward and surrounds the storage recess, which is rectangular in shape in plan view. At least one pair of opposing wall ribs, among the four wall ribs located on each side of the peripheral wall, are connected to bottom ribs that protrude downward from the portion of the lower surface of the bottom wall excluding the storage recess. The transport container according to feature 1. [Claim 3] The aforementioned upper protrusion is a hinge portion formed on one or both of the lid and the frame, which rotatably connects the lid and the frame. The transport container according to feature 1. [Claim 4] The aforementioned upper protrusion is a positioning protrusion formed on one or both of the lid and the frame, which determines the relative position of the lid and the frame. The transport container according to feature 1.

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