Transport container

Abstract

To provide a transport container capable of efficiently draining water accumulated on its bottom wall.SOLUTION: A transport container 9 includes a bottom wall 1 having an upper surface 13. At an outer peripheral edge portion 16 of the bottom wall 1, there are provided a drainage hole 3 that penetrates from inside to outside, a standing surface 185 that rises from the upper surface 13, and an inclined surface 186 of a corner portion 183 that connects the upper surface 13 and the standing surface 185. Among the inclined surfaces 186 of the corner portion 183, a portion 1861 located closer to the drainage hole 3 is formed narrower in width than a portion 1862 located farther from the drainage hole 3.SELECTED DRAWING: Figure 14

Description

[Technical Field]

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

[0002] The transport container disclosed in Patent Document 1 is configured to be foldable and includes a bottom wall, a mouth frame, and a plurality of side walls connected to the bottom wall and the mouth frame. In this transport container, a pair of pivotable lids are pivotally attached to the mouth frame, and closing the pair of pivotable lids can prevent water from entering. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-95426 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned conventional transport containers have a problem in that when water enters the container, the water accumulates on the bottom wall.

[0005] The problem to be solved by the present disclosure is to provide a transport container that can efficiently drain water that accumulates on the bottom wall. [Means for solving the problem]

[0006] A transport container according to one aspect of the present disclosure includes a bottom wall having an upper surface. The outer peripheral edge of the bottom wall is provided with drainage holes penetrating from inside to outside, an upright surface rising from the upper surface, and a sloped corner connecting the upper surface and the upright surface. The sloped corner is narrower at a portion closer to the drainage holes than at a portion further away from the drainage holes. [Effects of the Invention]

[0007] The present disclosure provides an effect of being able to efficiently drain water accumulated on the bottom wall. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an overall perspective view of a transport container according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of a bottom wall of the transportation container. [Figure 3] FIG. 3 is a plan view of the bottom wall of the same. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 6 is a bottom view of the bottom wall of the same. [Figure 7] FIG. 7 is a perspective view of the above transport containers stacked one on top of the other. [Figure 8] FIG. 8 is a cross-sectional view of the bottom wall of the transport container of the third embodiment. [Figure 9] FIG. 9 is a cross-sectional view of the bottom wall of the transport container of the fourth embodiment. [Figure 10] FIG. 10 is a perspective view of the bottom wall of the transport container of the fifth embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a main part of the bottom wall of a transport container according to the sixth embodiment. [Figure 12] FIG. 12 is a cross-sectional view of a main part of the bottom wall of the transport container of the seventh embodiment. [Figure 13] FIG. 13 is a plan view of the bottom wall of the transport container of the eighth embodiment. [Figure 14] FIG. 14 is a plan view of the main part of the bottom wall of the same. [Figure 15] 15A is a cross-sectional view taken along line CC in FIG. 14, and FIG. 15B is a cross-sectional view taken along line DD in FIG. [Figure 16] FIG. 16A is a cross-sectional view of a main part showing a modified example of the bottom wall of the same, and FIG. 16B is another cross-sectional view of a main part showing the modified example of the same. [Figure 17]FIG. 17 is a plan view of a main part of another modified example of the bottom wall of the same. [Figure 18] FIG. 18 is a cross-sectional view of a main part of the bottom wall of a transport container according to the ninth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009]

[0023] The following description of an embodiment of a transport container according to the present disclosure will be made with reference to the accompanying drawings. Each of the embodiments listed below is merely an embodiment of the present disclosure, and the configurations of these embodiments can be appropriately combined and applied.

[0010] 1. First embodiment (The entire transport container) 1 shows a transport container 9 according to a first embodiment. In the following description, directions such as the up-down direction are based on the case where a bottom wall 1 of the transport container 9 is placed on a horizontal plane.

[0011] The transport container 9 of the first embodiment includes a box-shaped container body 90 having an upward opening, and a lid 8 connected to the container body 90 so as to open and close the opening of the container body 90.

[0012] The container body 90 includes a bottom wall 1, a mouth frame 2 located on the bottom wall 1, and a plurality of side walls 7 configured to stand between the bottom wall 1 and the mouth frame 2. The container body 90 is rectangular in plan view, and has a longitudinal direction D1 and a lateral direction D2 that are perpendicular to each other. The longitudinal direction D1 and the lateral direction D2 are each perpendicular to the up-down direction.

[0013] In the transport container 9 of the first embodiment, the container body 90 is foldable. By folding the container body 90, the bottom wall 1 and the mouth frame 2 are placed one on top of the other, thereby reducing the volume of the container body 90.

[0014] The bottom wall 1, mouth frame 2, side walls 7, and lid 8 of the transport container 9 of the first embodiment can be formed by injection molding using a synthetic resin material. The bottom wall 1, mouth frame 2, side walls 7, and lid 8 are all resin molded products. The bottom wall 1 is provided with various structures for drainage, which will be described later.

[0015] (bottom wall) 2 to 6, the bottom wall 1 is a plate material having a rectangular shape in a plan view. The longitudinal direction D1 and the lateral direction D2 of the bottom wall 1 coincide with the longitudinal direction D1 and the lateral direction D2 of the container body 90. The bottom wall 1 has an upper surface 13 and a lower surface 14 facing oppositely. Both the upper surface 13 and the lower surface 14 have a rectangular outer shape.

[0016] The bottom wall 1 includes an outer peripheral edge portion 16 and a main body portion 17 surrounded by the outer peripheral edge portion 16. In other words, the main body portion 17 is the portion of the bottom wall 1 excluding the outer peripheral edge portion 16. The outer peripheral edge portion 16 and the main body portion 17 are integrally formed.

[0017] The outer peripheral edge 16 of the bottom wall 1 has four corners 165 positioned at intervals from one another in the circumferential direction of the outer peripheral edge 16 .

[0018] Furthermore, the bottom wall 1 includes a pair of bearings 15 for rotatably connecting a pair of side walls 7 included in the plurality of side walls 7, and an upright piece 181 that forms the outermost peripheral portion of the bottom wall 1. The pair of bearings 15 and the upright piece 181 are included in the outer peripheral edge portion 16 of the bottom wall 1.

[0019] The pair of bearing portions 15 are provided at both ends in the short-side direction D2 of the bottom wall 1. Each of the pair of bearing portions 15 is provided linearly in the longitudinal direction D1. Each of the pair of bearing portions 15 has concave and convex portions alternately provided in the longitudinal direction D1.

[0020] The upright piece 181 has a rectangular frame shape in a plan view, and protrudes upward from other parts of the bottom wall 1. The pair of bearing portions 15 are located inside the upright piece 181.

[0021] (Detail of the top surface of the bottom wall) The upper surface 13 of the bottom wall 1 includes an upper surface 163 of the outer peripheral edge portion 16 and an upper surface 173 of the main body portion 17. The upper surface 163 of the outer peripheral edge portion 16 and the upper surface 173 of the main body portion 17 are smoothly continuous with each other.

[0022] The upper surface 163 of the outer peripheral edge portion 16 is a flat surface. In other words, the upper surface 163 of the outer peripheral edge portion 16 is the outer peripheral edge of the upper surface 13 of the bottom wall 1.

[0023] As shown in Figure 3 and other figures, four drainage holes 3 penetrating from inside to outside are provided in the outer peripheral edge portion 16. In the first embodiment, the four drainage holes 3 penetrate the bottom wall 1 from top to bottom. The four drainage holes 3 are provided in a one-to-one correspondence at the four corners 165 of the outer peripheral edge portion 16. Each drainage hole 3 is, for example, a round hole, but may have other shapes such as a rectangular shape.

[0024] The upper surface 163 of the outer peripheral edge portion 16 is preferably a horizontal surface, but the portion of the upper surface 163 around the drain hole 3 may be provided one step lower than the other portions. In this case, the portion of the upper surface 163 around the drain hole 3 is located at the lowest position among the upper surfaces 163, and therefore is located at the lowest position among the upper surfaces 13 of the bottom wall 1.

[0025] The main body portion 17 of the bottom wall 1 is a circular portion in a plan view. The main body portion 17 is curved in a convex shape as a whole so that the central portion in a plan view is the highest. Therefore, the upper surface 173 of the main body portion 17 is a bulging surface that is curved in a convex shape as a whole so that the central portion is the highest. In other words, the central portion of the upper surface 173 of the main body portion 17 is the central portion of the upper surface 13 of the bottom wall 1.

[0026] The central portion of upper surface 173 of main body portion 17 is the apex of upper surface 173, and is positioned approximately 3 mm higher than the lowest portion of upper surface 173. The central portion of upper surface 173 is preferably positioned higher than the lowest portion of upper surface 173 by a dimension within a range of, for example, 2 to 4 mm. The lowest portion of upper surface 173 here is the outer peripheral edge portion of upper surface 173, in other words, the boundary portion with upper surface 163 of outer peripheral edge portion 16. The inclination angle of upper surface 173 of main body portion 17 is preferably set within a range of 0.5 to 2 degrees, and more preferably within a range of 1 to 2 degrees.

[0027] In the transport container 9 of the first embodiment, the height of the lowest part of the upper surface 173 of the main body 17 is the same as the height of the upper surface 163 of the outer peripheral edge 16. In other words, the center of the upper surface 173 of the main body 17 is positioned approximately 3 mm higher than the upper surface 163 of the outer peripheral edge 16. It is preferable that the center of the upper surface 173 of the main body 17 is positioned higher than the upper surface 163 of the outer peripheral edge 16 by a dimension within a range of, for example, 2 to 4 mm.

[0028] The upper surface 173 of the main body 17 is configured with a gently sloping slope 10 that is positioned lower the further away from the center of the upper surface 173. The slope 10 slopes downward from the center toward the entire circumferential area of ​​the outer peripheral edge 16. In other words, the slope 10 of the bottom wall 1 is curved convexly as a whole so that it slopes downward toward any part of the circumferential direction of the outer peripheral edge 16 of the bottom wall 1.

[0029] A drain groove 4 is formed in the upper surface 13 of the bottom wall 1. The drain groove 4 is provided from the upper surface 173 of the main body 17 of the bottom wall 1 to the upper surface 163 of the outer peripheral edge 16. The drain groove 4 is configured to allow water to flow from the main body 17 of the bottom wall 1 toward the outer peripheral edge 16, and ultimately to flow into each drain hole 3 in the outer peripheral edge 16.

[0030] The drain groove 4 includes a grid-like groove group 45 recessed downward. The groove group 45 includes a plurality of first grooves 451 that are parallel to one another, a plurality of second grooves 452 that are parallel to one another, and a rectangular frame-like peripheral groove 453 that surrounds the plurality of first grooves 451 and the plurality of second grooves 452. Each of the grooves 451, 452, and 453 is, for example, a groove with a U-shaped cross section, but may also be a groove with another shape such as a circular arc-shaped cross section, a V-shaped cross section, or a U-shaped cross section.

[0031] The first grooves 451 extend linearly in the same direction, which is different from the longitudinal direction D1 and the lateral direction D2.

[0032] The second grooves 452 extend linearly in the same direction. The direction in which the second grooves 452 extend is different from the longitudinal direction D1 and the lateral direction D2, and is also different from the direction in which the first grooves 451 extend.

[0033] The plurality of first grooves 451 and the plurality of second grooves 452 intersect with one another in an area inside the frame-shaped outer peripheral groove 453. Each of the plurality of first grooves 451 intersects at a right angle with one or more second grooves 452 included in the plurality of second grooves 452. Similarly, each of the plurality of second grooves 452 intersects at a right angle with one or more first grooves 451 included in the plurality of first grooves 451.

[0034] A portion 48 of the drain groove 4 is provided at the top of the upper surface 13 of the bottom wall 1 (i.e., the top of the upper surface 173 of the main body 17). Here, the portion 48 of the drain groove 4 is the uppermost portion of the drain groove 4. The bottom of the uppermost portion of the drain groove 4 (i.e., the lower end of the uppermost portion of the drain groove 4) is located above the upper surface 163 of the outer peripheral edge portion 16 of the bottom wall 1.

[0035] In the transport container 9 of the first embodiment, the uppermost portion of the drain groove 4 is configured as an intersection of one of the plurality of first grooves 451 and one of the plurality of second grooves 452, but is not limited to this. For example, it may be configured as a central portion of one of the plurality of first grooves 451, or may be configured as a central portion of one of the plurality of second grooves 452.

[0036] (Detail of the underside of the base wall) 6, the lower surface 14 of the bottom wall 1 includes a lower surface 164 of the outer peripheral edge portion 16 and a lower surface 174 of the main body portion 17. The lower surface 164 of the outer peripheral edge portion 16 and the lower surface 174 of the main body portion 17 are smoothly continuous with each other.

[0037] In the transport container 9 of the first embodiment, the lower surface 164 of the outer peripheral edge portion 16 is a flat surface. The lower surface 164 is preferably a horizontal surface. In other words, the lower surface 164 of the outer peripheral edge portion 16 is the outer peripheral edge portion of the lower surface 14 of the bottom wall 1.

[0038] The lower surface 174 of the main body 17 is curved in a concave shape as a whole so that the central portion is highest. In other words, the central portion of the lower surface 174 of the main body 17 is the central portion of the lower surface 14 of the bottom wall 1.

[0039] The central part of lower surface 174 of main body 17 is the top of lower surface 174, and is positioned approximately 3 mm higher than the lowest part of lower surface 174. It is preferable that the central part of lower surface 174 is positioned, for example, within a range of 2 to 4 mm higher than the lowest part of lower surface 174. The lowest part of lower surface 174 here is the outer peripheral edge part of lower surface 174, in other words, the boundary part with lower surface 164 of outer peripheral edge part 16.

[0040] In the transport container 9 of the first embodiment, the height of the lowest part of the underside 174 of the main body 17 is the same as the height of the underside 164 of the outer peripheral edge 16. In other words, the center of the underside 174 of the main body 17 is positioned approximately 3 mm higher than the underside 164 of the outer peripheral edge 16. It is preferable that the center of the underside 174 of the main body 17 is positioned higher than the underside 164 of the outer peripheral edge 16 by a dimension within a range of, for example, 2 to 4 mm.

[0041] The lower surface 174 of the main body 17 is configured with an inclined surface 11 that is inclined as a whole so that the further away from the center of the lower surface 174 the lower surface is, the lower the position becomes. The inclined surface 11 slopes downward from the center toward the entire circumferential area of ​​the outer peripheral edge portion 16. In other words, the inclined surface 11 included in the lower surface 14 of the bottom wall 1 is formed in an overall concave curve so that it slopes downward toward any part of the circumferential direction of the outer peripheral edge portion 16 of the bottom wall 1.

[0042] A mating protrusion 6 is provided on the underside 14 of the bottom wall 1. The mating protrusion 6 is a portion that fits into the lower transport container 9 when transport containers 9 are stacked one above the other. The bending strength of the bottom wall 1 is increased by the mating protrusion 6. The mating protrusion 6 is made up of a lattice-shaped group of bottom ribs 65 that protrude downward from the underside 14 of the bottom wall 1.

[0043] The bottom rib group 65 includes a plurality of first ribs 651 that are parallel to each other, a plurality of second ribs 652 that are parallel to each other, and a rectangular frame-shaped peripheral rib 653 that surrounds the plurality of first ribs 651 and the plurality of second ribs 652.

[0044] The first ribs 651 extend linearly in the same direction, which is different from the longitudinal direction D1 and the lateral direction D2.

[0045] The second ribs 652 extend linearly in the same direction. The direction in which the second ribs 652 extend is different from the longitudinal direction D1 and the lateral direction D2, and is also different from the direction in which the first ribs 651 extend.

[0046] The multiple first ribs 651 and the multiple second ribs 652 intersect with each other in the region inside the frame-shaped outer peripheral rib 653. Each of the multiple first ribs 651 intersects at a right angle with one or more second ribs 652 included in the multiple second ribs 652. Similarly, each of the multiple second ribs 652 intersects at a right angle with one or more first ribs 651 included in the multiple first ribs 651.

[0047] 4, the lower end of the fitting protrusion 6 is located on an imaginary concave curved surface that follows the lower surface 14 of the bottom wall 1 (i.e., follows the slope 11 of the bottom wall 1). In the transport container 9 of the first embodiment, the dimension by which the fitting protrusion 6 protrudes from the lower surface 14 of the bottom wall 1 is uniform throughout the fitting protrusion 6.

[0048] Therefore, when the bottom wall 1 is placed on the horizontal plane S1, the peripheral edge of the fitting protrusion 6 abuts against the horizontal plane S1, while the remaining portion of the fitting protrusion 6 is positioned above the horizontal plane S1. The vertical distance between the fitting protrusion 6 and the horizontal plane S1 is greater the closer to the center of the bottom surface 14. Because the curved bottom wall 1 is elastic, when a heavy content is placed on the bottom wall 1, the bottom wall 1 may elastically deform and bend, causing the entire lower end of the fitting protrusion 6 to abut against the horizontal plane S1. In this case, the stability of the transport container 9 is improved, and the upper surface 13 of the bottom wall 1 becomes flat, thereby preventing the content from shifting out of position. Note that even if the entire lower end of the fitting protrusion 6 does not abut against the horizontal plane S1 (i.e., even if the lower end of the fitting protrusion 6 only partially abuts against the horizontal plane S1), the increased proportion of the lower end of the fitting protrusion 6 abutting against the horizontal plane S1 improves the stability of the transport container 9 and prevents the content from shifting out of position.

[0049] (Mouth frame) 1, the mouth frame 2 is formed in a rectangular frame shape in a plan view. An opening penetrating the mouth frame 2 from top to bottom constitutes the opening of the container body 90.

[0050] The mouth frame 2 integrally has a pair of first linear portions 21 extending in the longitudinal direction D1 and a pair of second linear portions 22 extending in the lateral direction D2. The pair of first linear portions 21 are positioned at a distance in the lateral direction D2 and are parallel to each other. The pair of second linear portions 22 are positioned at a distance in the longitudinal direction D1 and are parallel to each other.

[0051] The first straight line portions 21 and the second straight line portions 22 are positioned alternately and continuously in the circumferential direction of the mouth frame 2. The length of the first straight line portions 21 in the longitudinal direction D1 is longer than the length of the second straight line portions 22 in the lateral direction D2.

[0052] (multiple side walls) The multiple side walls 7 are four side walls 7. The four side walls 7 are composed of a pair of swinging plates 73 configured to be able to stand between the bottom wall 1 and the mouth frame 2, and a pair of folding plates 74 similarly configured to be able to stand between the bottom wall 1 and the mouth frame 2.

[0053] The pair of swinging plates 73 are each made of a rectangular flat plate material. The base end edges of the pair of swinging plates 73 are rotatably connected to the pair of second linear portions 22 of the mouth frame 2. The tip end edges of the pair of swinging plates 73 are detachably engaged with the peripheral portion of the bottom wall 1 from the inside of the peripheral portion.

[0054] With the leading edge portions of the pair of rocking plates 73 engaged with the bottom wall 1, the pair of rocking plates 73 assumes an upright position between the bottom wall 1 and the opening frame 2. By rotating the pair of rocking plates 73 in this position in a direction in which the leading edge portions approach each other, the pair of rocking plates 73 switches from the assembled state to the folded state.

[0055] The pair of folding plates 74 is composed of an upper plate 741 and a lower plate 742 that are rotatably connected to each other. The upper edge portions of the pair of folding plates 74 (i.e., the upper edge portion of the upper plate 741) are rotatably connected to the pair of first straight portions 21 of the mouth frame 2, and the lower edge portions of each of the pair of folding plates 74 (i.e., the lower edge portion of the lower plate 742) are rotatably connected to the pair of bearing portions 15 of the bottom wall 1. In each folding plate 74, the upper plate 741 and the lower plate 742 are configured to bend inward in a "L" shape.

[0056] With the upper plate 741 and the lower plate 742 of each of the pair of folding plates 74 stretched vertically, the pair of folding plates 74 is in an upright position between the bottom wall 1 and the mouth frame 2. By bending the pair of folding plates 74 in this position into a "L" shape, the pair of folding plates 74 is switched from the assembled state to the folded state.

[0057] When the container body 90 is folded, the pair of swing plates 73 in the folded state are positioned above the pair of folding plates 94 in the folded state.

[0058] (lid) As shown in FIG. 1, the lid 8 includes a pair of a first lid plate 81 and a second lid plate 82.

[0059] The base end edge of the first cover plate 81 is rotatably connected to one of a pair of first straight portions 21 extending in the longitudinal direction D1. The base end edge of the second cover plate 82 is rotatably connected to the other of the pair of first straight portions 21.

[0060] When the first cover plate 81 and the second cover plate 82 are in a closed position in which they close the opening of the container body 90, the leading edge portions of the first cover plate 81 and the second cover plate 82 are positioned so as to overlap one another vertically.

[0061] When the first cover plate 81 and the second cover plate 82 are in the closed position, the upper surface 813 of the first cover plate 81 and the upper surface 823 of the second cover plate 82 are positioned continuously in the short direction D2, forming the upper surface 83 of the lid 8 that closes the opening of the container body 90.

[0062] Grooves 84 are provided on the upper surface 813 of the first cover plate 81. Two grooves 84 are provided on the first cover plate 81 at a distance in the longitudinal direction D1. Each groove 84 is a drainage groove that continues to the outer peripheral edge of the first cover plate 81, in other words, a drainage groove that continues to the outer peripheral edge of the cover 8. It is preferable that each groove 84 slopes downward toward the outer peripheral edge of the first cover plate 81.

[0063] Similar grooves 84 are also provided on the upper surface 823 of the second cover plate 82. Two grooves 84 are provided on the second cover plate 82 at a distance in the longitudinal direction D1. Each groove 84 is a drainage groove that continues to the outer peripheral edge of the second cover plate 82, in other words, a drainage groove that continues to the outer peripheral edge of the lid 8. It is preferable that each groove 84 slopes downward toward the outer peripheral edge of the second cover plate 82.

[0064] (Stacked state) FIG. 7 shows a stacked state in which two transport containers 9 of the first embodiment are prepared and these two transport containers 9 are stacked one on top of the other.

[0065] Here, in the stacked state, the transport container 9 located relatively lower is referred to as the lower transport container 9L, and the transport container 9 located relatively higher is referred to as the upper transport container 9U. The upper transport container 9U is located above the lower transport container 9L.

[0066] When the lid 8 of each of the upper and lower transport containers 9U and 9L is in the closed position, the corresponding grooves 84 of the lid 8 are positioned above the four drainage holes 3 provided in the bottom wall 1.

[0067] Therefore, when the containers are stacked, the corresponding grooves 84 in the lid 8 of the lower transport container 9L are located below each of the four drainage holes 3 provided in the bottom wall 1 of the upper transport container 9U. Water that seeps into the interior of the upper transport container 9U flows down the slope 10 that slopes downward toward the outer peripheral edge 16 of the bottom wall 1 and the drainage grooves 4 to the upper surface 163 of the outer peripheral edge 16, then flows downward through each of the drainage holes 3 in the outer peripheral edge 16 and is smoothly discharged to the outside through the corresponding grooves 84 in the lid 8 of the lower transport container 9L.

[0068] 2. Second embodiment (Main parts of transport containers) A transport container 9 of the second embodiment will be described with reference to the drawings of the transport container of the first embodiment. In the description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the drawings, the reference numerals indicating the components unique to the second embodiment are shown in parentheses.

[0069] In the transport container 9 of the second embodiment, a curved concave drainage sink mark 5 is formed in place of the drainage groove 4 on the upper surface 13 of the bottom wall 1. The drainage sink mark 5 has a shape that follows the fitting protrusion 6. In other words, the drainage sink mark 5 has a shape that follows the bottom rib group 65.

[0070] The drainage sink mark 5 is formed into a curved concave shape above the bottom rib group 65 as the bottom rib group 65 is molded on the underside 14 of the bottom wall 1 by injection molding using a resin material.

[0071] More specifically, the drainage sink mark 5 includes a plurality of sink mark portions 51 corresponding to the plurality of first grooves 451 of the drainage groove 4. The plurality of sink mark portions 51 are located directly above the plurality of first ribs 651 of the bottom rib group 65, and are formed to a shape that follows the plurality of first ribs 651. Furthermore, the drainage sink mark 5 includes a plurality of sink mark portions 52 corresponding to the plurality of second grooves 452 of the drainage groove 4. The plurality of sink mark portions 52 are located directly above the plurality of second ribs 652 of the bottom rib group 65, and are formed to a shape that follows the plurality of second ribs 652. Furthermore, the drainage sink mark 5 includes a sink mark portion 53 corresponding to the outer peripheral groove 453 of the drainage groove 4. The sink mark portion 53 is located directly above the outer peripheral rib 653 of the bottom rib group 65, and is formed to a shape that follows the outer peripheral rib 653.

[0072] A portion 58 of the drainage sink 5 provided at the top of the upper surface 13 of the bottom wall 1 is the uppermost portion of the drainage sink 5. The drainage sink 5 is formed so that the groove bottom of the uppermost portion of the drainage sink 5 (i.e., the lower end of the uppermost portion of the drainage sink 5) is located above the upper surface 163 of the outer peripheral edge portion 16 of the bottom wall 1.

[0073] In order to form the drainage sink mark 5 as intended by injection molding, it is preferable that the width dimension of each of the ribs 651, 652, 653 of the fitting protrusion 6 protruding from the lower surface 14 of the bottom wall 1 is set to be larger than the thickness of the bottom wall 1. Specifically, it is preferable that the width dimension of each of the ribs 651, 652, 653 of the fitting protrusion 6 is set to be within a range of 1.5 to 3 times the thickness of the bottom wall 1, and it is even more preferable that it is set to be within a range of 2 to 3 times the thickness of the bottom wall 1.

[0074] (Manufacturing method) A method for manufacturing the transportation container 9 of the second embodiment (hereinafter simply referred to as the "manufacturing method of the second embodiment") will be described.

[0075] In the manufacturing method of the second embodiment, a slope 10 that slopes downward toward the entire outer peripheral edge 16 of the bottom wall 1 is formed on the upper surface 13 of the bottom wall 1 by injection molding using a synthetic resin material, and a fitting protrusion 6 consisting of a lattice-shaped group of bottom ribs 65 that protrude downward is formed on the lower surface 14 of the bottom wall 1. In addition, four drainage holes 3 are formed on the outer peripheral edge 16 of the bottom wall 1 by injection molding using a synthetic resin material.

[0076] During the above-described injection molding, a curved, concave drainage sink mark 5 as shown in FIG. 5 etc. is molded in the portion of the upper surface 13 of the bottom wall 1 that includes the slope 10. The drainage sink mark 5 is a depression that occurs on the back side of the fitting protrusion 6 due to the presence of the fitting protrusion 6 when the synthetic resin material shrinks during injection molding, and has a lattice-like shape that follows the fitting protrusion 6. In the transport container 9 of the second embodiment, this lattice-like drainage sink mark 5 forms a groove for allowing water to flow toward the four drainage holes 3.

[0077] 3. Third embodiment 8 shows a cross section of the bottom wall 1 of a transport container 9 of the third embodiment. In describing the transport container 9 of the third embodiment, the same components as those of the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0078] In the third embodiment, the lower ends of the bottom rib group 65 constituting the fitting protrusion 6 are positioned on an imaginary flat surface, rather than on an imaginary curved surface as in the previous embodiments. This imaginary flat surface overlaps with the horizontal plane S1 when the bottom wall 1 is placed on the horizontal plane S1. In the third embodiment, the dimension by which the bottom rib group 65 protrudes from the lower surface 14 of the bottom wall 1 is set to be longer the closer to the center of the lower surface 14. In the third embodiment, the entire lower end of the bottom rib group 65 abuts against the horizontal plane S1, thereby improving the stability of the transport container 9. Furthermore, the strength of the bottom wall 1 is improved.

[0079] 4. Fourth embodiment 9 shows a cross section of the bottom wall 1 of a transport container 9 of the fourth embodiment. In describing the transport container 9 of the fourth embodiment, the same components as those of the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0080] In the fourth embodiment, most of the upper surface 13 of the bottom wall 1 is configured with an inclined surface 10 that slopes downward in one direction. Unlike the previous embodiments, the inclined surface 10 of this modification is formed so as to slope downward toward a partial region in the circumferential direction of the outer peripheral edge 16 of the bottom wall 1, rather than sloping downward toward the entire circumferential direction of the outer peripheral edge 16. Because this partial region in the circumferential direction of the outer peripheral edge 16 of the bottom wall 1 is located lower than other regions of the outer peripheral edge 16, it is preferable to provide at least one drainage hole 3 in this partial region.

[0081] 5. Fifth embodiment 10 shows the bottom wall 1 of a transport container 9 according to the fifth embodiment. In describing the transport container 9 according to the fifth embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0082] In the fifth embodiment, the drain groove 4 on the upper surface 13 of the bottom wall 1 does not have a shape that follows the mating protrusion 6 as in the first embodiment, but has an X-shape that connects the four drain holes 3 provided at the four corners of the bottom wall 1.

[0083] Specifically, the drain groove 4 includes a linear groove 41 connecting two drain holes 3 located on a diagonal line of the rectangular bottom wall 1, and a linear groove 42 connecting two drain holes 3 located on another diagonal line of the bottom wall 1. The two linear grooves 41, 42 intersect at the center, which is the highest point on the upper surface 173 of the main body portion 17. In the fifth embodiment, only a portion of the drain groove 4 is located above the fitting protrusion 6, but it is also possible to form the drain groove 4 so that the entire drain groove 4 is located above the fitting protrusion 6. In this case, the drain groove 4 has a shape that follows the fitting protrusion 6. Each of the grooves 41, 42 has a U-shaped cross section, for example, but may have other shapes, such as an arc-shaped cross section, a V-shaped cross section, or a C-shaped cross section.

[0084] The upper surface 13 of the bottom wall 1 may be provided with an inclined surface that slopes downward toward the drain groove 4. In this case, the inclined surfaces are preferably provided, for example, on both sides of the grooves 41 and 42 of the drain groove 4.

[0085] 6. Sixth embodiment 11 shows a main part of the bottom wall 1 of a transport container 9 according to the sixth embodiment. In describing the transport container 9 according to the sixth embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0086] In the sixth embodiment, a drain hole 3 penetrating from inside to outside is formed at the corner where the main part of the outer peripheral edge 16 of the bottom wall 1 and the standing piece 181 intersect to form an L shape. The main part of the outer peripheral edge 16 is the part of the outer peripheral edge 16 from which the pair of bearing parts 15 and the standing piece 181 have been removed.

[0087] In the sixth embodiment, the drain hole 3 is formed across the main part of the outer peripheral edge 16 of the bottom wall 1 and the upright piece 181. To prevent the drain hole 3 from reducing the strength of the corner portion of the bottom wall 1 (i.e., the corner portion where the main part of the outer peripheral edge 16 and the upright piece 181 intersect to form an L-shape), the drain hole 3 is preferably an elongated hole formed long in a predetermined direction. The predetermined direction here is a direction intersecting the direction in which the corner portion extends, and more preferably a direction perpendicular to the direction in which the corner portion extends.

[0088] In the sixth embodiment, it is also preferable that the drain holes 3 are formed across the upright pieces 181 and the corners of the main part of the outer peripheral edge 16 of the bottom wall 1 .

[0089] The configuration of the sixth embodiment is also applicable to a general container in which four side walls 7 extend directly from the outer peripheral edge 16 of the bottom wall 1. That is, in a general container in which four side walls 7 extend from the outer peripheral edge 16 of the bottom wall 1, drain holes 3 may be formed penetrating from the inside to the outside at corners where the outer peripheral edge 16 of the bottom wall 1 and the side walls 7 intersect to form an L shape. The drain holes 3 may be formed to straddle the outer peripheral edge 16 of the bottom wall 1 and the side walls 7. To prevent the drain holes 3 from reducing the strength of the corners of the bottom wall 1 (i.e., the corners where the outer peripheral edge 16 and the side walls 7 intersect to form an L shape), the drain holes 3 are preferably elongated holes extending in a predetermined direction. The predetermined direction here is a direction intersecting the direction in which the corners extend, and more preferably a direction perpendicular to the direction in which the corners extend. It is also preferable that the drain holes 3 be formed to straddle each corner of the outer peripheral edge 16 of the bottom wall 1 and the side walls 7.

[0090] 7. Seventh embodiment 12 shows a main part of the bottom wall 1 of a transport container 9 according to the seventh embodiment. In describing the transport container 9 according to the seventh embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0091] In the seventh embodiment, a drain hole 3 penetrating from inside to outside is formed in the upright piece 181 of the bottom wall 1. In the seventh embodiment, the drain hole 3 does not penetrate the bottom wall 1 in the vertical direction, but penetrates it horizontally.

[0092] The configuration of the seventh embodiment is also applicable to a general container in which four side walls 7 stand directly from the outer peripheral edge 16 of the bottom wall 1. That is, in a general container in which four side walls 7 stand from the outer peripheral edge 16 of the bottom wall 1, drainage holes 3 penetrating from the inside to the outside may be formed in the lower ends of the side walls 7 standing from the outer peripheral edge 16 of the bottom wall 1.

[0093] In each embodiment, four drainage holes 3 are provided in the outer peripheral edge 16 of the bottom wall 1, but the number of drainage holes 3 is not limited to this. It is sufficient that at least one drainage hole 3 is provided in the outer peripheral edge 16 of the bottom wall 1.

[0094] 8. Eighth embodiment 13 shows the bottom wall 1 of a transport container 9 according to the eighth embodiment. In describing the transport container 9 according to the eighth embodiment, the same components as those in the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0095] (bulging surface) In the eighth embodiment, the upper surface 173 of the main body 17 of the bottom wall 1 is configured with a bulging surface 19 that bulges upward. The central portion of the bulging surface 19 is a flat surface 195. The bulging surface 19 bulges entirely so that the flat surface 195 facing directly upward is positioned at the highest point.

[0096] The bulging surface 19 has an outer edge 190 that is rectangular in plan view. The outer edge 190 is rectangular and includes a pair of short sides 191 and a pair of long sides 192. The pair of short sides 191 are both linear and parallel to each other. The pair of long sides 192 are both linear and parallel to each other.

[0097] A pair of short sides 191 included in the outer edge 190 of the bulging surface 19 are parallel to a pair of short sides of the rectangular bottom wall 1 in a plan view. Similarly, a pair of long sides 192 included in the outer edge 190 of the bulging surface 19 are parallel to a pair of long sides of the rectangular bottom wall 1 in a plan view.

[0098] In the eighth embodiment, as described above, the outer edge 190 of the bulging surface 19 has a shape similar to the outer shape of the bottom wall 1, but this is not limited to this and it is also possible for it to have other shapes, such as a circular shape, an elliptical shape, an octagonal shape, etc.

[0099] Furthermore, in the eighth embodiment, the central flat surface 195 has a shape similar to the outer edge 190 of the bulging surface 19 (in other words, a rectangular or oblong shape), but this is not limited to this, and the flat surface 195 can also have other shapes, such as a circular shape, an elliptical shape, an octagonal shape, etc.

[0100] The portion of the bulging surface 19 surrounding the central flat surface 195 constitutes an inclined surface 10 that slopes downward from the flat surface 195 .

[0101] The inclined surface 10 in the eighth embodiment includes a pair of first inclined surfaces 101 that slope downward in opposite directions, and a pair of second inclined surfaces 102 that slope downward in opposite directions.

[0102] The pair of first inclined surfaces 101 are each inclined downward from a flat surface 195 located in the center toward a pair of short sides 191. The inclination angles of the pair of first inclined surfaces 101 are the same. The pair of first inclined surfaces 101 have the same outer shape. The outer shapes of the pair of first inclined surfaces 101 are both trapezoidal.

[0103] The pair of second inclined surfaces 102 are each inclined downward from a flat surface 195 located in the center toward the pair of long sides 192. The inclination angles of the pair of second inclined surfaces 102 are the same. The pair of second inclined surfaces 102 have the same outer shape. The outer shapes of the pair of second inclined surfaces 102 are both trapezoidal.

[0104] The inclination angle of the pair of first inclined surfaces 101 and the inclination angle of the pair of second inclined surfaces 102 are the same.

[0105] 13, the dimension a in the inclination direction (i.e., longitudinal direction D1) of each first inclined surface 101 and the dimension b in the inclination direction (i.e., lateral direction D2) of each second inclined surface 102 are the same. Note that it is not essential that the dimension a and the dimension b are the same, and the dimension a may be smaller than the dimension b, or the dimension a may be larger than the dimension b.

[0106] The inclined surface 10 further includes four convex curved surfaces 104. Each convex curved surface 104 is a surface that connects the adjacent first inclined surface 101 and second inclined surface 102. The four convex curved surfaces 104 have the same outer shape. The outer shape of each convex curved surface 104 is approximately rectangular and includes a pair of straight sides that are parallel to each other. As described above, in the eighth embodiment, the dimension a and the dimension b are the same, and the inclination angles of the pair of first inclined surfaces 101 and the pair of second inclined surfaces 102 are the same, so that adjacent first inclined surfaces 101 and second inclined surfaces 102 are smoothly connected via the convex curved surfaces 104.

[0107] In the above-described inclined surface 10, a pair of first inclined surfaces 101 and a pair of second inclined surfaces 102 are alternately connected via four convex curved surfaces 104. The first inclined surfaces 101 and the second inclined surfaces 102 that are adjacent to each other in the circumferential direction surrounding the flat surface 195 are smoothly connected via a corresponding one of the four convex curved surfaces 104. Note that the convex curved surface 104 is not essential to the inclined surface 10, and the first inclined surfaces 101 and the second inclined surfaces 102 may be connected without the convex curved surface 104 interposed therebetween.

[0108] In the eighth embodiment, the portion of the upper surface 163 of the outer peripheral edge portion 16 adjacent to the pair of protruding steps 12 provided on the bottom wall 1 is configured as a flat surface 168. The pair of protruding steps 12 are portions with which a pair of swing plates 73 engage, and are provided at both ends of the bottom wall 1 in the longitudinal direction D1. In other words, the portion of the upper surface 163 of the outer peripheral edge portion 16 adjacent to the protruding steps 12 is the portion between the short side of the bottom wall 1 and the slope 10. The tip edge portions of each of the pair of swing plates 73 engage and disengage from the inside with a corresponding one of the pair of protruding steps 12.

[0109] In the eighth embodiment, a flat surface 168 is provided at an inner position in the longitudinal direction D2 for each of a pair of protruding portions 12 of the bottom wall 1, so that when the pair of rocking plates 73 are rotated, the leading edge portions of each rocking plate 73 are prevented from interfering with the bottom wall 1.

[0110] In the eighth embodiment, the lower edge of the inclined surface 10 is configured with a curved surface 194 that smoothly connects to the flat surface 168. The inclined surface 10 and the flat surface 168 are smoothly connected via the concave curved surface 194. The upper edge of the inclined surface 10 is configured with a curved surface 196 that smoothly connects to the flat surface 195. The curved surface 196 is formed in an annular shape so as to surround the entire periphery of the flat surface 195. The inclined surface 10 and the flat surface 195 are smoothly connected via the convex curved surface 196.

[0111] In the inclination direction of the first inclined surface 101 (i.e., the longitudinal direction D1), the dimension of the flat surface 195 is longer than the dimension a of the first inclined surface 101 and longer than the dimension of the flat surface 168. The dimension of the flat surface 168 in the inclination direction of the first inclined surface 101 is shorter than the dimension a of the first inclined surface 101. With the above dimension settings, the first inclined surface 101 has a relatively large inclination angle.

[0112] The portion where the flat surface 168 is provided is not limited to the above, and for example, the flat surface 168 may be provided on the portion of the upper surface 163 of the outer peripheral edge portion 16 adjacent to a pair of bearing portions 15 provided on the bottom wall 1 (in other words, the portion between the long side of the bottom wall 1 and the inclined surface 10).

[0113] In the eighth embodiment, the bottom wall 1 is not provided with the drain groove 4 or the drain sink 5, but the top surface 13 of the bottom wall 1 may be provided with at least one of the drain groove 4 and the drain sink 5.

[0114] Furthermore, the bottom wall 1 of the transport container 9 of the eighth embodiment has the following features.

[0115] (drain hole) As shown in FIGS. 13 and 14, eight drain holes 3 are provided in the outer peripheral edge 16 of the bottom wall 1.

[0116] Each drain hole 3 is a rectangular hole, but may have other shapes such as a circular hole. The inner circumferential surface of each drain hole 3 has a cross-sectional shape that is linear from top to bottom in a vertical cross section, but it is also preferable that the upper end of the inner circumferential surface of at least one of the eight drain holes 3 has an arc-shaped cross-sectional shape in a vertical cross section so that the opening area of ​​the drain hole 3 increases toward the upper portion. In this case, rounded corners are formed at the upper end of the inner circumferential surface of the drain hole 3.

[0117] It is also preferable that the lower end of the inner circumferential surface of at least one of the eight drainage holes 3 has an arc-shaped cross section in vertical cross section so that the opening area of ​​the drainage hole 3 increases toward the lower portion. In this case, rounded corners are formed at the lower end of the inner circumferential surface of the drainage hole 3.

[0118] The eight drainage holes 3 include four drainage holes 3A and four drainage holes 3B.

[0119] The four drainage holes 3A are provided at positions sandwiching each of a pair of protruding portions 12 from both sides in the short-side direction D2. The four drainage holes 3A penetrate vertically through the outer peripheral edge portion 16 of the bottom wall 1. The four drainage holes 3B are located in one-to-one correspondence at the four corners 165 of the bottom wall 1 and penetrate vertically through the outer peripheral edge portion 16 of the bottom wall 1.

[0120] The two drainage holes 3A located on both sides of the protruding step 12 are each partially covered at their upper portions by a cover 182 that protrudes upward from the outer peripheral edge 16. The cover 182 separates the upper space that communicates with the drainage holes 3A from the upright piece 181 that is adjacent to the drainage holes 3A in the first direction D1, and is provided so as to open this space toward the center of the upper surface 13 of the bottom wall 1.

[0121] The outer peripheral edge 16 of the bottom wall 1 includes a pair of edge portions 161 extending linearly in the second direction D2. Two drainage holes 3B are located at both ends of the edge portion 161 in the second direction D2, and two drainage holes 3A are located between the two drainage holes 3B. A protruding step 12 extending linearly in the second direction D2 is located between the two drainage holes 3A.

[0122] A small distance d1 is provided in the first direction D1 between the drain hole 3B and the adjacent standing piece 181. A cover 182 is positioned between the drain hole 3A and the adjacent standing piece 181, and a small distance d2 is provided in the first direction D1 between the cover 182 and the standing piece 181. Distance d2 is greater than distance d1.

[0123] (inside corner) A plurality of inside corners 183 extending linearly in the second direction D2 are provided on the outer peripheral edge 16 of the bottom wall 1. The inside corners 183 are portions that connect the upper surface 13 of the bottom wall 1 to an upright surface 185 that stands up from the upper surface 13. The inside corners 183 have inclined surfaces 186 that are continuous with the upper surface 13 and the upright surfaces 185.

[0124] The multiple inside corners 183 include an inside corner 183A formed along the protruding step 12 and two inside corners 183B formed along the standing piece 181. In the second direction D2, the inside corner 183A is located between the two inside corners 183B that are located at a distance in the second direction D2.

[0125] The inside corner portion 183A is a portion that connects the upper surface 13 of the bottom wall 1 and the inner surface 125 of the protruding step portion 12. The inside corner portion 183A has a slope 186A that is continuous with the upper surface 13 of the bottom wall 1 and the inner surface 125 of the protruding step portion 12. The upright surface 185 to which the slope 186A of the inside corner portion 183A is continuous is an upright surface 185A that is formed by the inner surface 125 of the protruding step portion 12.

[0126] The slope 186A of the inside corner portion 183A extends linearly in the second direction D2 along the protruding portion 12 and is connected to the drainage holes 3A located at both ends of the protruding portion 12. Note that it is not essential that the slope 186A be directly connected to the drainage holes 3A on both sides, and a gap may be formed between at least one of the drainage holes 3A on both sides and the slope 186A.

[0127] The slope 186A of the inside corner 183A includes a portion 1862 (hereinafter referred to as "portion 1862A") located in the middle in the second direction D2, and portions 1861 (hereinafter referred to as "portions 1861A") on both sides of the portion 1862A. The portions 1861A on both sides are narrower than the middle portion 1862A. The width here refers to the width in a direction perpendicular to the second direction D2.

[0128] In other words, in half of the inclined surface 186A in the second direction D2 (in other words, the half closer to one of the two drainage holes 3A), the portion 1861A of the inclined surface 186A closer to the drainage hole 3A is narrower than the portion 1862A away from the drainage hole 3A.

[0129] 15A and 15B, inclined surface 186A is a concave curved surface that is curved so that its vertical cross section is arc-shaped. Of the concave curved surface that constitutes inclined surface 186A, the radius of curvature of portion 1861A near drainage hole 3 (see FIG. 15B) is set smaller than the radius of curvature of portion 1862A away from drainage hole 3 (see FIG. 15A).

[0130] The inside corner portion 183B is a portion that connects the upper surface 13 of the bottom wall 1 and the inner surface 1815 of the standing piece 181. The inside corner portion 183B has a slope 186B that is continuous with the upper surface 13 of the bottom wall 1 and also with the inner surface 1815 of the standing piece 181. The standing surface 185 to which the slope 186B of the inside corner portion 183B is continuous is a standing surface 185B that is formed by the inner surface 1815 of the standing piece 181.

[0131] Sloped surface 186B of inside corner portion 183B extends linearly in second direction D2 along standing piece 181 so as to connect the portion between cover 182 and standing piece 181 to one drainage hole 3B. Note that it is not essential that sloped surface 186B be directly connected to drainage hole 3B, and a gap may be formed between drainage hole 3B and sloped surface 186B.

[0132] At least a portion of the inclined surface 186B of the inside corner portion 183B is configured to come into contact with the lower end of the rocking plate 73 when the rocking plate 73 is in an assembled state. Therefore, it is preferable that at least a portion of the inclined surface 186B of the inside corner portion 183B and a surface of the lower end of the rocking plate 73 that comes into contact with the inclined surface 186B of the inside corner portion 183B have shapes that match each other. For example, it is preferable that the vertical cross section of the inclined surface 186B of the inside corner portion 183B is arc-shaped, and that the vertical cross section of the surface of the lower end of the rocking plate 73 that comes into contact with the inclined surface 186B of the inside corner portion 183B is also arc-shaped, and that the radii of curvature of both surfaces are the same.

[0133] The slope 186B of the inside corner portion 183B includes a portion 1861 (hereinafter referred to as "portion 1861B") close to the drainage hole 3B and a portion 1862 (hereinafter referred to as "portion 1862B") away from the drainage hole 3B. The portion 1861B close to the drainage hole 3B is narrower than the portion 1862B away from the drainage hole 3. The width here refers to the width in a direction perpendicular to the second direction D2.

[0134] Like inclined surface 186A of inside corner 183A, inclined surface 186B of inside corner 183B is a concave curved surface curved so that its vertical cross section is arc-shaped. Of the concave curved surface constituting inclined surface 186B, portion 1861B near drainage hole 3 has a smaller radius of curvature than portion 1862B away from drainage hole 3.

[0135] Additionally, in the transport container 9 of the eighth embodiment, a plurality of inside corners 187 extending linearly in the first direction D1 are provided on the outer peripheral edge 16 of the bottom wall 1. The inside corners 187 are portions that connect the upper surface 13 of the bottom wall 1 and the inner surface 155 of the bearing portion 15. The slopes 188 of the inside corners 187 are formed as concave curved surfaces that are continuous with the upper surface 13 and the inner surface 155, but they can also be formed as flat surfaces. By forming the slopes 188 of the inside corners 187 to be wide, water is prevented from accumulating in the inside corners 187, which in turn allows water that has accumulated on the bottom wall 1 to be efficiently drained.

[0136] Slope 186A of inside corner portion 183A, slope 186B of inside corner portion 183B, and slope 188 of inside corner portion 187 are all concavely curved surfaces and have different radii of curvature. The radius of curvature of slope 186A of inside corner portion 183A is preferably larger than the radii of curvature of slope 186B of inside corner portion 183B and slope 188 of inside corner portion 187, and the radius of curvature of slope 186B of inside corner portion 183B is preferably smaller than the radius of curvature of slope 188 of inside corner portion 187.

[0137] In particular, because the lower end of the rocking plate 73 abuts against the inside corner 183B, the radius of curvature of the slope 186B of the inside corner 183B is smaller than the radius of curvature of the slope 186A of the inside corner 183A, and the width of the slope 186B is set to be relatively narrow, thereby reducing the proportion of the convex curved portion of the lower end of the rocking plate 73 that abuts against the inside corner 183B. In other words, the proportion of the flat surface portion of the lower end of the rocking plate 73 that abuts against the flat surface 168 of the bottom wall 1 is ensured, thereby increasing the load-bearing capacity of the rocking plate 73 in the assembled state.

[0138] 14, in the eighth embodiment of the transport container 9, inside corner 183B extending linearly in second direction D2 and inside corner 187 extending linearly in first direction D1 are connected via an L-shaped corner portion. This corner portion has a concavely curved surface that smoothly connects concavely curved slope 186B of inside corner 183B and concavely curved slope 188 of inside corner 187. The radius of curvature of the concavely curved surface of this corner portion is preferably larger than the radius of curvature of slope 186B of inside corner 183B.

[0139] (Action and effect) In the transport container 9 of the eighth embodiment, the bottom wall 1 has the above-mentioned inside corner portion 183, so that water flows smoothly through the inside corner portion 183 to the drainage hole 3, and water accumulated on the bottom wall 1 is efficiently discharged.

[0140] That is, in inside corner 183A located in the center of edge portion 161 of bottom wall 1, of sloped surface 186A of inside corner 183A, both end portions 1861A that are close to drainage holes 3A on both sides are narrower than central portion 1862A that is farther from drainage holes 3A on both sides, and sloped surface 186A of inside corner 183A is provided so as to gradually become narrower the closer it is to drainage hole 3A. In other words, sloped surface 186A of inside corner 183A includes a portion that gradually becomes narrower the closer it is to drainage hole 3A.

[0141] In other words, the concave curved surface that constitutes the inclined surface 186A is provided so that the radius of curvature gradually decreases as it approaches the drainage hole 3A. In other words, the concave curved surface that constitutes the inclined surface 186A includes a portion where the radius of curvature gradually decreases as it approaches the drainage hole 3A.

[0142] Since the inside corner portion 183A has the above-described structure, water adhering to the slope 186A of the inside corner portion 183A flows down the slope 186A and is smoothly guided to the drain holes 3A on both sides.

[0143] In a recessed corner 183B located at the end of edge portion 161 of bottom wall 1, a portion 1861B of a slope 186B of the recessed corner 183B that is closer to drain hole 3B is narrower than a portion 1862B that is further from drain hole 3B. The slope 186B of the recessed corner 183B includes a portion that gradually narrows as it approaches drain hole 3B. The gradually narrowing portion is formed by the end of slope 186B that is farthest from drain hole 3B, and this end is located between upright piece 181 and cover 182; however, for example, the entire slope 186B may be gradually narrower as it approaches drain hole 3B.

[0144] In other words, the concave curved surface that constitutes slope 186B includes a portion where the radius of curvature gradually decreases as it approaches drain hole 3B. The portion where the radius of curvature gradually decreases is configured at the end of slope 186B that is farthest from drain hole 3B, and this end is located between upright piece 181 and cover 182, but for example, the entire slope 186B may be configured so that the radius of curvature gradually decreases as it approaches drain hole 3B.

[0145] Since the inside corner portion 183B has the above-described structure, water adhering to the inclined surface 186B of the inside corner portion 183B is smoothly guided down the inclined surface 186B to the drain hole 3B.

[0146] (Variation) Figures 16A and 16B show a modified example of the bottom wall 1 of the transport container 9 of the eighth embodiment. Figure 16A is a cross-sectional view taken at the same position as in Figure 15A, and Figure 16B is a cross-sectional view taken at the same position as in Figure 15B.

[0147] In one modified example, slope 186A of inside corner 183A provided in bottom wall 1 is configured as a flat surface rather than a concave curved surface. Even in this case, part 1861A of slope 186A of inside corner 183A that is close to drain hole 3A is made narrower than part 1862A that is farther from drain hole 3A, so that water flows smoothly down slope 186A of inside corner 183A to drain hole 3A.

[0148] As with inside corner 183A, inclined surface 186B can be formed as a flat surface in another inside corner 183B provided in bottom wall 1. Even in this case, water adhering to inclined surface 186B of inside corner 183B is smoothly guided along inclined surface 186B to drain hole 3B.

[0149] 17 shows another modified example of the bottom wall 1 of the transport container 9 of the eighth embodiment. FIG. 17 is a plan view showing the same part as FIG.

[0150] In another modified example, the entire slope 186A of the inside corner 183A provided along the protruding step 12 is formed to gradually narrow toward one of the drainage holes 3A on both sides. In other words, a portion 1861A of the slope 186A close to the one drainage hole 3A is narrower than a portion 1862A away from the drainage hole 3A.

[0151] Additionally, in another modification, the slope 186B of the inside corner portion 183B provided along the standing piece 181 includes a portion 1862B located in the middle in the second direction D2 and portions 1861B on both sides of the portion 1862B. The portions 1861B on both sides are narrower than the middle portion 1862B.

[0152] That is, in one half of the inclined surface 186B in the second direction D2, a portion 1861B of the inclined surface 186B that is closer to the drain hole 3B is narrower than a portion 1862B that is farther from the drain hole 3B. In the other half of the inclined surface 186B, a portion 1861B of the inclined surface 186B that is closer to the drain hole 3A is narrower than a portion 1862B that is farther from the drain hole 3A.

[0153] Even in this case, water tends to flow smoothly down slope 186A to drain hole 3A at inside corner 183A in the center of edge portion 161. At inside corners 183B at both ends of edge portion 161, water tends to flow smoothly down half of slope 186B to drain hole 3B, and also tends to flow smoothly down the other half of slope 186A to drain hole 3A.

[0154] The position and penetration direction of the drainage hole 3 in the transport container 9 of the eighth embodiment are not limited to those shown in Figures 13 and 14. For example, as shown in the sixth embodiment, the drainage hole 3 may be formed across a main part of the outer peripheral edge 16 of the bottom wall 1 and the upright piece 181, in which case the drainage hole 3 is preferably an elongated hole. As shown in the seventh embodiment, the drainage hole 3 may be formed in the upright piece 181 of the bottom wall 1, penetrating from inside to outside. In this case, the drainage hole 3 penetrates the upright piece 181 included in the outer peripheral edge 16 of the bottom wall 1 in the horizontal direction.

[0155] 9. Ninth embodiment 18 shows a cross section of a main part of the bottom wall 1 of a transport container 9 of the ninth embodiment. In describing the transport container 9 of the ninth embodiment, the same components as those of the above-described embodiments are denoted by the same reference numerals and detailed description thereof will be omitted.

[0156] In the ninth embodiment, an inclined surface 169 is provided on the upper surface 163 of the outer peripheral edge portion 16, which is inclined upward so that the further away it is from the inclined surface 10 of the bottom wall 1, the higher it is located. The inclined surface 169 may be provided so as to form a step over the entire circumferential area of ​​the outer peripheral edge portion 16, or may be provided so as to form a step over only a portion of the circumferential area of ​​the outer peripheral edge portion 16.

[0157] In the ninth embodiment, a flat surface 167 is provided on the upper surface 13 of the bottom wall 1 between the slope 10 and the inclined surface 169 located outside it, but the flat surface 167 may not be provided and the slope 10 may be continuous with the inclined surface 169. In this case, the boundary between the slope 10 and the inclined surface 169 becomes the lowest part of the upper surface 13 of the bottom wall 1.

[0158] 10. Various Modifications The above-described embodiments are merely one of various embodiments of the present disclosure, and various modifications are possible depending on the design and the like as long as the object of the present disclosure can be achieved.

[0159] Various modified examples are listed below. The modified examples listed below can be applied in appropriate combinations. In the description of the modified examples, the same components as those in the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

[0160] In each embodiment, the drain holes 3 are provided in the corners 165 of the outer peripheral edge 16, but the portions of the outer peripheral edge 16 where the drain holes 3 are provided are not limited to these, and the drain holes 3 may be provided in portions of the outer peripheral edge 16 excluding the corners 165. The drain holes 3 may also be provided in both or one of the pair of bearing portions 15 of the bottom wall 1. In this case, the drain holes 3 are preferably provided at both ends or one end of the bearing portions 15 in the longitudinal direction D1. The drain holes 3 are preferably provided in the bottom surface of one or more recesses of the bearing portion 15 having recesses and protrusions, and are preferably provided in the bottom surface of recesses located at both ends or one end of the bearing portions 15 in the longitudinal direction D1.

[0161] In each embodiment, the container body 90 is foldable, but is not limited to this. For example, all or part of the multiple side walls 7 may be fixed to the bottom wall 1, or it may be a general container in which four side walls 7 stand up from the outer peripheral edge 16 of the bottom wall 1.

[0162] In each embodiment, the drain hole 3 is provided at a position on the bottom wall 1 that is spaced horizontally from the upright piece 181, but the drain hole 3 at each corner may be provided without a distance between it and the upright piece 181. In this case, no flat surface is formed between the drain hole 3 and the upright piece 181 at each corner of the bottom wall 1.

[0163] This is also true for a general container in which four side walls 7 rise directly from the outer peripheral edge 16 of the bottom wall 1. That is, in a general container in which four side walls 7 rise from the outer peripheral edge 16 of the bottom wall 1, the drainage holes 3 at each corner may be provided at a horizontal distance from the adjacent side wall 7, or may be provided without any distance between them. It is also preferable that the drainage holes 3 at each corner be provided in a portion of the bottom wall 1 that includes a three-plane intersection. The three-plane intersection here is the point where the inner surfaces of the two side walls 7 that intersect in an L-shape in plan view intersect with the top surface 13 of the bottom wall 1.

[0164] In each embodiment, the lid 8 is rotatably connected to the container body 90, but this is not limited thereto, and the lid 8 may be placed detachably on the container body 90. Also, in each embodiment, the lid 8 is made up of a first lid plate 81 and a second lid plate 82, but this is not limited thereto, and the lid 8 may be made up of a single lid plate. It is also possible that the transport container 9 does not include the lid 8.

[0165] In each embodiment, the upper surface 173 of the main body 17 is convexly curved, while the upper surface 163 of the outer peripheral edge 16 is flat, but this is not limited to this, and the entire area from the upper surface 173 of the main body 17 to the upper surface 163 of the outer peripheral edge 16 (i.e., the entire upper surface 13 of the bottom wall 1) may be convexly curved.

[0166] In the first embodiment, a drain groove 4 is provided on the upper surface 13 of the bottom wall 1, and in the second embodiment, a drain sink 5 is provided on the upper surface 13 of the bottom wall 1, but this is not limited to this, and both the drain groove 4 and the drain sink 5 may be provided on the upper surface 13 of the bottom wall 1.

[0167] In the sixth embodiment shown in FIG. 11 and the seventh embodiment shown in FIG. 12, the inner circumferential surface of the drain hole 3 has a linear cross-sectional shape in a vertical cross section, but the shape of the inner circumferential surface of the drain hole 3 is not limited to this. For example, it is also preferable that the inner end of the inner circumferential surface of the drain hole 3, which is closer to the upper surface 13 of the bottom wall 1, has an arc-shaped cross-sectional shape in a vertical cross section so that the opening area of ​​the drain hole 3 increases toward the inside. In this case, rounded corners are formed at the inner end of the inner circumferential surface of the drain hole 3. Note that in the seventh embodiment shown in FIG. 12, it is preferable that the inner end of the inner circumferential surface of the drain hole 3, excluding the lower end, has an arc-shaped cross-sectional shape in a vertical cross section.

[0168] 11. Summary As explained based on the above embodiments (particularly the eighth embodiment) and various modified examples, a transport container 9 according to a first aspect of the present disclosure includes a bottom wall 1 having an upper surface 13. An outer peripheral edge 16 of the bottom wall 1 is provided with drainage holes 3 (3A, 3B) penetrating from the inside to the outside, standing surfaces 185 (185A, 185B) standing from the upper surface 13, and slopes 186 (186A, 186B) of inside corners 183 (183A, 183B) connecting the upper surface 13 and the standing surfaces 185 (185A, 185B). Of the slope 186 (186A, 186B) of the inside corner portion 183 (183A, 183B), the portion 1861 (1861A, 1861B) close to the drainage hole 3 (3A, 3B) is narrower than the portion 1862 (1862A, 1862B) away from the drainage hole 3.

[0169] According to this embodiment, water adhering to the slopes 186 (186A, 186B) of the inside corners 183 (183A, 183B) is smoothly guided along the slopes 186 (186A, 186B) to the drain holes 3 (3A, 3B). Therefore, water accumulated on the bottom wall 1 is efficiently drained.

[0170] In a transport container 9 according to a second aspect of the present disclosure, in the first aspect, outer peripheral edge 16 includes a linear edge portion 161. Sloped surface 186A of inside corner 183A is located in the center of edge portion 161. Drainage holes 3A are located on both sides of the center of edge portion 161. Of sloped surface 186A of inside corner 183A, end portions 1861A near the drainage holes 3A on both sides are narrower than central portion 1862A away from the drainage holes 3A on both sides.

[0171] According to this embodiment, water adhering to the inclined surface 186A of the inside corner portion 183A flows down the inclined surface 186A and is smoothly guided to the drain holes 3A on both sides.

[0172] In a transport container 9 according to a third aspect of the present disclosure, in the first or second aspect, the inclined surface 186 (186A, 186B) of the inside corner portion 183 (183A, 183B) is a concave curved surface curved so that the vertical cross section is arc-shaped. The radius of curvature of the concave curved surface near the drainage holes 3 (3A, 3B) is smaller than the radius of curvature of the portion away from the drainage holes 3 (3A, 3B).

[0173] According to this embodiment, water adhering to the concavely curved inclined surface 186 (186A, 186B) is smoothly guided down the inclined surface 186 (186A, 186B) to the drain holes 3 (3A, 3B).

[0174] In the transport container 9 according to the fourth aspect of the present disclosure, in the first or second aspect, the slope 186 (186A, 186B) of the inside corner portion 183 (183A, 183B) includes a portion that gradually narrows as it approaches the drainage hole 3 (3A, 3B).

[0175] According to this embodiment, water adhering to the inclined surfaces 186 (186A, 186B) is guided more smoothly down the inclined surfaces 186 (186A, 186B) to the drain holes 3 (3A, 3B).

[0176] In a transport container 9 according to a fifth aspect of the present disclosure, in the first or second aspect, the slope 186 (186A, 186B) of the inside corner portion 183 (183A, 183B) is a concave curved surface curved so that the vertical cross section is arc-shaped. The concave curved surface includes a portion whose radius of curvature gradually decreases as it approaches the drainage hole 3 (3A, 3B).

[0177] According to this embodiment, water adhering to the concavely curved inclined surface 186 (186A, 186B) is guided more smoothly along the inclined surface 186 (186A, 186B) to the drain holes 3 (3A, 3B). [Explanation of symbols]

[0178] 1 bottom wall 13 Top side 16 Outer edge 161 Edge 183 Inside corner 183A Inside corner 183B Inside corner 185 Erection surface 185A Erecting surface 185B Erecting surface 186 Slope 186A Slope 186B Slope 1861 part 1861A part 1861B part 1862 part 1862A part 1862B part 3 Drain hole 3A Drain hole 3B Drain hole 9 Transport containers

Claims

1. a bottom wall having an upper surface; The outer peripheral edge of the bottom wall is provided with drainage holes penetrating from inside to outside, an upright surface rising from the top surface, and a sloped inner corner connecting the top surface and the upright surface, The slope of the inside corner portion is narrower at a portion closer to the drainage hole than at a portion farther from the drainage hole. Transport container.

2. the outer periphery includes a linear edge portion; the inclined surface of the inside corner is located in the center of the edge portion, The drainage holes are located on both sides of the center of the edge portion, The slope of the inside corner portion has both end portions close to the drain holes on both sides that are narrower than a central portion away from the drain holes on both sides.

2. The shipping container of claim 1.

3. the inclined surface of the inside corner portion is a concave curved surface that is curved so that a vertical cross section thereof is arc-shaped, The radius of curvature of the concave curved surface at a portion close to the drain hole is set smaller than the radius of curvature of a portion away from the drain hole.

3. The transport container of claim 1 or 2.

4. The slope of the inside corner portion includes a portion that gradually narrows toward the drain hole.

2. The shipping container of claim 1.

5. the inclined surface of the inside corner portion is a concave curved surface that is curved so that a vertical cross section thereof is arc-shaped, The concave curved surface includes a portion whose radius of curvature gradually decreases as it approaches the drain hole.

2. The shipping container of claim 1.

Images