Transport containers

Abstract

This invention proposes a transport container in which the support member of the transport device contacts the underside of the bottom wall of the transport container, making it easier to support the underside of the bottom wall and transport it stably. [Solution] The bottom wall 2 of the transport container 1 is provided with an outer edge rib 23, a grid rib 24, and a partition rib 25 that protrude downward from the lower surface of the bottom wall 2. The partition rib 25 is an annular shape in plan view that protrudes downward from the lower surface of the bottom wall 2. The portion of the lower surface of the bottom wall 2 inside the outer edge rib 23 is defined as the outer edge rib inner region 230. A part of the outer edge rib inner region 230 is defined as a support region 250 that can be contacted by a support member that supports the lower surface of the bottom wall 2. All or part of the outer edge rib inner region 230 excluding the support region 250 is defined as the grid rib forming region 240. A grid rib 24 is formed in the grid rib forming region 240. A partition rib 25 is formed at the edge of the support region 250. A gate mark 13 is formed in the portion of the bottom wall 2 excluding the support region 250.

Description

Technical Field

[0001] The present disclosure relates to a transport container.

Background Art

[0002] Patent Document 1 describes a transport container including a side wall and a bottom wall and having an opening facing upward. This transport container includes an outer edge rib that protrudes downward from the lower surface of the bottom wall and has an annular shape in plan view, and a lattice rib that protrudes downward and has a lattice shape in plan view in a region inside the outer edge rib on the lower surface of the bottom wall. The transport container is transported with the lower surface of the bottom wall supported by an arm of a transporter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional transport container described in Patent Document 1, an outer edge rib and a lattice rib are formed on the lower surface of the bottom wall. Therefore, when the arm of the transporter supports the lower surface of the bottom wall, the arm hits the outer edge rib or the lattice rib and does not contact the flat lower surface of the bottom wall, making it difficult for the arm to support the lower surface of the bottom wall.

[0005] The problem to be solved by the present disclosure is to propose a transport container in which a support member of a transporter contacts the lower surface of the bottom wall of the transport container, and the lower surface of the bottom wall is easily supported by the support member and is stably transported.

Means for Solving the Problems

[0006] A transport container according to one aspect of the present disclosure comprises side walls and a plate-shaped bottom wall, and is open upward. The bottom wall comprises an outer edge rib, a grid rib, and a partition rib. The outer edge rib is annular in plan view and protrudes downward from the lower surface of the bottom wall. The grid rib is grid-shaped in plan view and protrudes downward from the lower surface of the bottom wall. The partition rib is annular in plan view and protrudes downward from the lower surface of the bottom wall. The portion of the lower surface of the bottom wall inside the outer edge rib is defined as the outer edge rib inner region. A portion of the outer edge rib inner region is defined as a support region that can be contacted by a support member that supports the lower surface of the bottom wall. All or part of the outer edge rib inner region excluding the support region is defined as the grid rib forming region. The grid rib is formed in the grid rib forming region. The partition rib is formed at the edge of the support region. Gate marks are formed in the portion of the bottom wall excluding the support region. [Effects of the Invention]

[0007] The transport container of this disclosure is designed so that the support member of the transporter contacts the lower surface of the bottom wall of the transport container, making it easier to support the lower surface of the bottom wall with the support member and to transport it stably. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of a transport container according to one 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 bottom wall of the transport container shown above. [Figure 4] Figure 4 is a bottom view of the bottom wall of the transport container shown above. [Figure 5] Figure 5 is a longitudinal cross-sectional view of a portion of the bottom wall of the transport container shown above. [Figure 6] Figure 6A is a partial longitudinal cross-sectional view of the bottom wall of modified transport container 1. Figure 6B is a partial bottom view of the bottom wall of modified transport container 2. [Modes for carrying out the invention]

[0009] The present invention relates to a transport container, and more particularly to a transport container having side walls and a plate-shaped bottom wall and opening upwards. Hereinafter, one embodiment of the transport container 1 according to the present invention will be described with reference to Figures 1 to 5.

[0010] (1) Overall structure As shown in Figures 1 and 2, the transport container 1 has side walls 4 and a plate-shaped bottom wall 2, and opens upward. The transport container 1 of this embodiment comprises a container body 10 and a lid 5. The container body 10 comprises a bottom wall 2, a mouth frame 3 located above the bottom wall 2, and side walls 4 installed between the bottom wall 2 and the mouth frame 3. These bottom wall 2, mouth frame 3, side walls 4 and lid 5 are made of synthetic resin.

[0011] In the following explanation, the top and bottom will be described as being in the normal state of use, that is, the side where the opening frame 3 is located will be considered the top and the side where the bottom wall 2 is located will be considered the bottom. Furthermore, the inside and outside will be described as the side away from the center of the transport container 1 being the outside and the side closer to the center being the inside.

[0012] (2) Bottom wall (outline) As shown in Figures 3 and 4, the bottom wall 2 is rectangular in plan view (particularly rectangular). For convenience, the pair of sides opposite each other in the longitudinal direction 12 (direction along the longer side) in plan view (i.e., the shorter sides) are designated as the first side 21, and the pair of sides opposite each other in the short direction 11 (direction along the shorter side) in plan view (i.e., the longer sides) are designated as the second side 22. The bottom wall 2 will be described in detail later.

[0013] (3) Opening As shown in FIGS. 1 and 2, the mouth frame 3 has a rectangular ring shape (particularly a rectangular shape) in plan view, and the outer contour shape in plan view is formed to be substantially the same as the outer contour shape of the bottom wall 2 in plan view and also has substantially the same size. The mouth frame 3 has a vertically penetrating interior, and this penetration opening serves as an access port for storing items into and out of the transport container 1 in the assembled state. For convenience, similar to the bottom wall 2, the mouth frame 3 has a pair of side portions (i.e., short side portions) facing the longitudinal direction 12 in plan view as the first side portions 31, and a pair of side portions (i.e., long side portions) facing the short side direction 11 in plan view as the second side portions 32.

[0014] (4) Side wall The side wall 4 surrounds the storage space formed above the bottom wall 2 over the entire circumference. The side wall 4 has a pair of first side walls 6 provided along the bottom wall 2 and the first side portions 21, 31 of the mouth frame 3, and a pair of second side walls 7 provided along the bottom wall 2 and the second side portions 22, 32 of the mouth frame 3.

[0015] (4.1) First side wall The first side wall 6 is formed such that its length in the lateral direction (horizontal direction) is substantially the same as the lengths of the first side portions 21, 31 of the bottom wall 2 and the mouth frame 3. Also, in this embodiment, the first side wall 6 is formed in a rectangular shape in front view with a length in the vertical direction shorter than its length in the lateral direction.

[0016] As shown in FIG. 2, the upper end portion of the first side wall 6 is rotatably connected to the first side portion 31 of the mouth frame 3. In this embodiment, a shaft portion 61 provided at the upper end portion of the first side wall 6 is pivotally supported by a bearing portion 311 provided at the first side portion 31 of the mouth frame 3, enabling the first side wall 6 to rotate with respect to the mouth frame 3. Note that the connection of the first side wall 6 to the mouth frame 3 is not limited to such a form, as long as the first side wall 6 can rotate with respect to the mouth frame 3.

[0017] Also, the lower end portion of the first side wall 6 is detachable from the first side portion 21 of the bottom wall 2.

[0018] (4.2) Second side wall The second side wall 7 is formed such that its horizontal length is substantially the same as the lengths of the second side portions 22 and 32 of the bottom wall 2 and the mouth frame 3. Further, in the present embodiment, the second side wall 7 is formed in a rectangular shape in a front view, where its vertical length is shorter than its horizontal length. The second side wall 7 is vertically divided into an upper wall 71 and a lower wall 72.

[0019] (4.2.1) Upper wall The upper wall 71 is rotatably connected at its upper end to the second side portion 32 of the mouth frame 3. In the present 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 32 of the mouth frame 3, enabling the upper wall 71 to rotate with respect to the mouth frame 3. Note that the connection of the upper wall 71 to the mouth frame 3 is not limited to such a form, as long as the upper wall 71 can rotate with respect to the mouth frame 3.

[0020] (4.2.2) Lower wall The lower wall 72 is rotatably connected at its lower end to the second side portion 22 of the bottom wall 2. In the present embodiment, a shaft portion 721 provided at the lower end of the lower wall 72 is pivotally supported by a bearing portion 221 provided on the second side portion 22 of the bottom wall 2, enabling the lower wall 72 to rotate with respect to the bottom wall 2. Note that the connection of the lower wall 72 to the bottom wall 2 is not limited to such a form, as long as the lower wall 72 can rotate with respect to the bottom wall 2.

[0021] Also, the lower end of the upper wall 71 and the upper end of the lower wall 72 are rotatably connected to each other. As shown in FIG. 1, in the present 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, enabling the upper wall 71 and the lower wall 72 to rotate relative to each other. Note that the connection between the upper wall 71 and the lower wall 72 is not limited to such a form, as long as the upper wall 71 and the lower wall 72 can rotate relative to each other.

[0022] (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 3 in plan view, and its size is also approximately the same. In this embodiment, the lid 5 is composed of a first lid 51 and a second lid 52 which are divided in the short direction 11.

[0023] 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.

[0024] The first lid 51 is rotatably connected to the second side 32 of the frame 3, with the side portion along the second side 32 of the frame 3 being the same as the first lid 51. As shown in Figure 2, in this embodiment, a shaft portion 53 provided at the lower end of the first lid 51 is pivotally supported by a bearing portion 321 provided at the upper end of the second side 32 of the frame 3, and a shaft portion 322 provided at the upper end of the second side 32 of the frame 3 is pivotally supported by a bearing portion 54 provided at the lower end of the first lid 51, so that the first lid 51 and the second side 32 of the frame 3 are rotatable relative to each other. Note that the connection between the first lid 51 and the second side 32 of the frame 3 is not limited to this form; it is sufficient that the first lid 51 and the second side 32 of the frame 3 are rotatable relative to each other.

[0025] (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.

[0026] The assembled state is when the lower end of the first side wall 6 is attached to the first side portion 21 of the bottom wall 2, so that the first side wall 6 is upright, and the upper wall 71 and lower wall 72 of the second side wall 7 extend vertically so that the second side wall 7 is upright, and a storage space is formed inside.

[0027] The folded state is a state in which the lower end of the first side wall 6 detaches from the first edge 21 of the bottom wall 2, causing the first side wall 6 to collapse onto the bottom wall 2, and the upper wall 71 and lower wall 72 of the second side wall 7 fold so that they overlap, causing the second side wall 7 to collapse onto the bottom wall 2, and no storage space is formed inside.

[0028] 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.

[0029] (7) Bottom wall (details) As shown in Figure 4, the bottom wall 2 comprises an outer edge rib 23, a grid rib 24, and a partition rib 25. The outer edge rib 23, the grid rib 24, and the partition rib 25 are formed on the lower surface of the bottom wall 2. The lower surface of the bottom wall 2 is flat except for the portion where the outer edge rib 23, the grid rib 24, and the partition rib 25 are formed. The outer edge rib 23, the grid rib 24, and the partition rib 25 protrude downward from the flat lower surface of the bottom wall 2.

[0030] (7.1) Outer rib, inner region of outer rib The outer edge rib 23 is an annular shape in plan view that protrudes downward from the lower surface of the bottom wall 2. In this embodiment, the outer edge rib 23 is a roughly rectangular annular rib that runs along the edge of the lower surface of the bottom wall 2. The outer edge rib 23 is located on the outer edge that forms the outer perimeter of the part that contacts the surface when the transport container 1 is placed on a flat surface such as a floor. Ribs may protrude downward from a position outside the outer edge rib 23 on the lower surface of the bottom wall 2, but ribs located outside the outer edge rib 23 will not contact the surface when the transport container 1 is placed on a flat surface. The portion of the lower surface of the bottom wall 2 inside the outer edge rib 23 is called the inner outer edge rib region 230. A support region 250, which will be described later, is formed in a part of the inner outer edge rib region 230, and the remaining lattice rib forming region 240, which will be described later, is formed.

[0031] (7.2) Lattice ribs, lattice regions The lattice ribs 24 are grid-like in plan view and protrude downward from the lower surface of the bottom wall 2. In this 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.

[0032] The lattice ribs 24 are formed in the lattice rib formation region 240 of the outer edge rib inner region 230. The lattice rib formation region 240 consists of the entirety of the outer edge rib inner region 230, excluding the support region 250 which will be described later.

[0033] The region enclosed by two adjacent first rib pieces 241 and two adjacent second rib pieces 242 that are perpendicular to these two first rib pieces 241 is defined as the grid region 243. In a plan view, the grid region 243 is square in shape, with each side forming a 45-degree angle with respect to the short direction 11 and the long direction 12. All grid regions 243 are basically the same shape and size, but some grid regions 243 have a shape in which a part of them is missing.

[0034] As shown in Figure 5, the projection height H24 of the lattice ribs 24 from the bottom surface of the bottom wall 2 is not uniform. As shown in Figure 4, the lattice rib forming region 240 has a roughly rectangular central region 244 that includes the center 20 of the bottom wall 2 in a plan view (bottom view), and a peripheral region 245 located around the central region 244, excluding the central region 244. As shown in Figure 5, the projection height H244 of the lattice ribs 24 formed in the central region 244 is lower than that of the peripheral region 245 of the lattice ribs 24 formed in the peripheral region 245.

[0035] (7.3) Partition ribs, support areas As shown in Figure 4, the partition rib 25 is an annular shape in plan view that protrudes downward from the lower surface of the bottom wall 2. In this embodiment, the partition rib 25 has an annular shape in plan view. The partition rib 25 is formed at the edge of the support region 250. In other words, in plan view, the area inside the partition rib 25 on the lower surface of the bottom wall 2 becomes the support region 250.

[0036] The support regions 250 are formed in a part of the outer rib inner region 230. Preferably, the support regions 250 are formed in at least four locations within the outer rib inner region 230, corresponding to each of the four corners. In this embodiment, the support regions 250 are formed in a total of six locations within the outer rib inner region 230, in addition to the four locations corresponding to each of the four corners, and in the middle of the second side portion 22.

[0037] The support area 250 is formed so that support members such as the arms of a conveyor that transports the transport container 1 can contact it, and the container 1 is supported by the support members. The support members support the lower surface of the bottom wall 2 and move the transport container 1 in the horizontal and / or vertical directions. As shown in Figure 5, the support area 250 is made up of flat surfaces. Since no ribs are formed in the support area 250, its bending rigidity, bending strength, and impact resistance are weak.

[0038] As shown in Figures 4 and 5, in a plan view, the support area 250 is larger than the grid area 243; that is, the area of ​​the support area 250 is larger than the area of ​​the grid area 243. When the support member is larger than the grid area 243, if the support member attempts to support the bottom wall 2 from below, the support member cannot directly contact the lower surface of the bottom wall 2, but instead contacts the lower end of the grid rib 24. When the support member supports the lower end of the grid rib 24, if a horizontal force is applied to the transport container 1 supported by the support member, the lower end of the grid rib 24 may slide laterally along the upper end of the support member, and the transport container 1 may fall off the support member. For this reason, it is preferable for the support member to support the lower surface of the bottom wall 2 in an area surrounded by ribs such as the grid rib 24 and partition rib 25. In such cases, if the support member is larger than the grid area 243 surrounded by the grid rib 24, it is necessary to secure an area on the lower surface of the bottom wall 2 that the support member can contact, separate from the grid area 243, and the support area 250 is formed as such an area.

[0039] The area of ​​the support region 250 is preferably formed to be 1.5 times or more and 10 times or less the area of ​​the grid region 243, and more preferably 2 times or more and 5 times or less. While it is preferable for the area of ​​the support region 250 to be larger than the area of ​​the grid region 243 to broaden the range of selectable support members that can support the support region 250, it is undesirable because it reduces the bending rigidity, bending strength, and impact resistance of the support region 250. Therefore, from the viewpoint of the bending rigidity, bending strength, and impact resistance of the support region 250, it is preferable for the area of ​​the support region 250 to be 5 times or less the area of ​​the grid region 243.

[0040] As shown in Figure 5, the projection height H25 from the lower surface of the bottom wall 2 of the support region 250 is formed to be the same as the projection height H24 from the lower surface of the bottom wall 2 of the lattice rib 24. In this embodiment, the projection height H245 from the lower surface of the bottom wall 2 of the lattice rib 24 adjacent to the partition rib 25 (more specifically, the lattice rib 24 located in the peripheral region 245) is formed to be the same as the projection height H25. In addition, the projection height H244 from the lower surface of the bottom wall 2 of the lattice rib 24 located in the central region 244 is formed to be lower than the projection height H25.

[0041] The thickness T25 of the partition rib 25 is formed to be the same as the thickness T24 of the grid rib 24. Here, the thickness T25 may be the average value of the thickness of the partition rib 25 in the protruding direction, or the thickness at the midpoint of the protruding height H25 of the partition rib 25. Similarly, the thickness T24 may be the average value of the thickness of the grid rib 24 in the protruding direction, or the thickness at the midpoint of the protruding height H24 of the grid rib 24.

[0042] The thickness T250 of the bottom wall 2 in the support region 250 is formed to be the same as the thickness T240 of the bottom wall 2 in the lattice rib formation region 240.

[0043] The inner surface of the partition rib 25 has an inclined surface 251 that slopes upward so that its diameter increases as it moves further away from the support area 250. The inclined surface 251 guides the support member to the support area 250.

[0044] (7.4) Gate marks Gate marks 13 are formed in the portion of the bottom wall 2 excluding the support region 250. In this embodiment, gate marks 13 are formed at the tip of the intersection of the first rib piece 241 and the second rib piece 242 of the lattice rib 24. A total of four gate marks 13 are formed in the peripheral region 245, near each of the four corners of the central region 244. This eliminates the need to provide gate marks 13 in the support region 250, making it easier to create a flat surface in the support region 250.

[0045] As shown in Figure 4, in a plan view, the distance L250 from the center 20 of the bottom wall 2 to the support area 250 is longer than the distance L13 from the center 20 to the gate mark 13. In other words, the distance L13 from the center 20 to the gate mark 13 is shorter than the distance L250 from the center 20 of the bottom wall 2 to the inner surfaces of the partition ribs 25E and 25F formed in the middle of the second side portion 22. This allows the gate mark 13 to be located close to the center 20, making it easier to evenly distribute the molten resin constituting the bottom wall 2 throughout the entire bottom wall 2.

[0046] Furthermore, in a plan view, the distance L25 from the gate mark 13 to the partition rib 25 is longer than the distance L23 from the partition rib 25 to the outer edge rib 23. To explain further, the distance L25 from the gate mark 13 to the partition ribs 25A to 25D formed at one of the four locations corresponding to the four corners of the inner region 230 of the outer edge rib is longer than the distance L231 from these partition ribs 25A to 25D to the outer edge rib 23 located on the first side 21, and the distance L232 from these partition ribs 25A to 25D to the outer edge rib 23 located on the second side 22. As a result, the support region 250, which has weak bending rigidity, bending strength, and impact resistance, is provided close to the outer edge rib 23, thereby improving the bending rigidity, bending strength, and impact resistance of the support region 250.

[0047] For all partition ribs 25, the distance L23 from the partition rib 25 to the outer edge rib 23 closest to that partition rib 25 is the same.

[0048] In the partition ribs 25A to 25D formed at four locations corresponding to the four corners of the outer edge rib region 230, comparing the distance L231 to the outer edge rib 23 located at the first side 21, the distance L232 to the outer edge rib 23 located at the second side 22, and the distance L25 from the partition ribs 25A to 25D to the gate mark 13, ·Distance L25>Distance L232>Distance L231, ·Distance L25>Distance L231>Distance L232, ·Distance L25>Distance L231=Distance L232, It is preferable that it be one of the following.

[0049] Also, • Distance L25 > Distance L23 (Distance L231 or Distance L232) × 2 This is preferable. This makes it less susceptible to stress during injection molding.

[0050] It is preferable that the partition ribs 25 and support regions 250 are not formed on the perpendicular bisector 26 of the line segment connecting two gate marks 13 that are in the same position in the short direction 11 and spaced apart in the long direction 12, and on the perpendicular bisector 27 of the line segment connecting two gate marks 13 that are in the same position in the long direction 12 and spaced apart in the short direction 11. As a result, the support regions 250 are not located on the weld line, making it easier to ensure the bending rigidity, bending strength, and impact resistance of the support regions 250.

[0051] Furthermore, it is preferable that the partition rib 25 is formed at a distance of at least half the distance between the two gate marks 13, away from the gate marks 13. This makes it less susceptible to stress during injection molding.

[0052] (8) Variations The transport container 1 may be a foldable transport container 1 other than the one described in the above embodiment, or it may be a non-foldable transport container 1 (for example, a one-piece type).

[0053] In the above embodiment, the bottom wall 2 is rectangular in plan view, but it may also be square.

[0054] In the above embodiment, the outer frame 3 has a rectangular shape when viewed from above, but the outer frame may also have a square shape.

[0055] In the above embodiment, the bottom wall 2 and the opening frame 3 have their short sides designated as first sides 21 and 31 and their long sides designated as second sides 22 and 32. However, the short sides may be designated as second sides and the long sides as first sides.

[0056] 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.

[0057] 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.

[0058] The lid 5 is of an optional configuration and does not have to be provided on the transport container 1.

[0059] 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.

[0060] The outer edge rib 23 may, of course, be strictly annular in plan view (bottom view), but it may not be strictly annular and may have a part that is interrupted. The height of the outer edge rib 23 protruding from the bottom surface of the bottom wall 2 does not have to be uniform. The shape of the outer edge rib 23 in plan view is not limited to a rectangular shape. If there is a part that is interrupted in the outer edge rib 23, a hypothetical annular outer edge rib 23 is assumed to connect the ends of the outer edge rib 23 on both sides of the interrupted part, and the inside of this assumed annular outer edge rib 23 is defined as the inner region 230 of the outer edge rib.

[0061] The lattice rib formation region 240 may be formed in a part of the outer edge rib inner region 230 excluding the support region 250. That is, in the outer edge rib inner region 230, lattice ribs 24 may be formed in a part of the portion excluding the support region 250, while the remaining portion may not have lattice ribs 24 formed.

[0062] The protruding height H24 of the lattice rib 24 may be the same or different in all parts.

[0063] In the case of multiple first rib pieces 241, they do not have to be strictly parallel to adjacent first rib pieces 241, and they may intersect with adjacent first rib pieces 241. Also, the spacing between adjacent first rib pieces 241 does not have to be constant. The direction in which the multiple first rib pieces 241 extend is not limited to directions that form a 45-degree angle with the short direction 11 and the long direction 12, but may be parallel to the short direction 11 or parallel to the long direction 12.

[0064] In the case of multiple second rib pieces 242, they do not have to be strictly parallel to adjacent second rib pieces 242, and they may intersect with adjacent second rib pieces 242. Also, the spacing between adjacent second rib pieces 242 does not have to be constant. The direction in which the multiple second rib pieces 242 extend is not limited to directions that form a 45-degree angle with respect to the longitudinal direction 12 and the transverse direction 11, but may be parallel to the longitudinal direction 12 or parallel to the transverse direction 11.

[0065] The angle between the first rib piece 241 and the second rib piece 242 does not have to be 90 degrees. In other words, the first rib piece 241 and the second rib piece 242 do not have to be perpendicular to each other.

[0066] The grid region 243 does not have to be square, and its shape is not limited.

[0067] The number, position, and shape of the partition ribs 25 and support areas 250 are not particularly limited.

[0068] The projection height H25 of the support area 250 from the lower surface of the bottom wall 2 may be lower than or higher than the projection height H24 of the lattice rib 24 from the lower surface of the bottom wall 2.

[0069] The support area 250 may be a perfectly flat surface, but it does not have to be a perfectly flat surface; it may be partially curved, or have recesses, protrusions, or through holes.

[0070] The partition rib 25 may, of course, be strictly annular in plan view (bottom view), but it may not be strictly annular and may have a part that is interrupted. The projection height H25 of the partition rib 25 from the bottom surface of the bottom wall 2 does not have to be uniform. If there is a part that is interrupted in the partition rib 25, the ends of the partition rib 25 on both sides of the interrupted part may be connected by a straight line, for example, to assume a virtual annular partition rib 25, and the inside of this assumed annular partition rib 25 may be defined as the support region 250.

[0071] The thickness T25 of the partition rib 25 may be thicker than or thinner than the thickness T24 of the grid rib 24.

[0072] The thickness T250 of the bottom wall 2 in the support region 250 may be formed to be thicker than the thickness T240 of the bottom wall 2 in the lattice rib formation region 240. This can improve the bending rigidity, bending strength, and impact resistance of the support region 250.

[0073] The gate marks 13 are not limited to the tip of the intersection of the first rib piece 241 and the second rib piece 242 of the lattice rib 24. The gate marks 13 may be formed in parts of the lattice rib 24 other than the intersection. The gate marks 13 may be formed in parts of the lower surface of the bottom wall 2 excluding the support region 250, i.e., the lattice rib forming region 240, or in parts of the outer edge rib inner region 230 excluding the support region 250 and the lattice rib forming region 240, or on the upper surface of the bottom wall 2, or on the side end faces of the bottom wall 2. In addition, the gate marks 13 may be provided in some of the support regions 250 among a plurality of support regions 250. The number of gate marks 13 is not limited.

[0074] The distance L23 from one compartment rib 25 to the outer edge rib 23 closest to that compartment rib 25 does not have to be the same for all compartment ribs 25, and may differ for each compartment rib 25.

[0075] (8.1) Variation 1 Modification 1 will be explained based on Figure 6A.

[0076] The inner surface of the partition rib 25 may have a vertical surface 252 in addition to the inclined surface 251. Of the inner surface of the partition rib 25, the side facing the base protruding from the bottom wall 2 is the vertical surface 252, and the side facing the tip is the inclined surface 251.

[0077] As a result, the base end of the partition rib 25 is made thick to ensure rigidity and strength, while the tip end is made into an inclined surface 251 to guide the support member to the support area 250.

[0078] (8.2) Variation 2 Modification 2 will be explained based on Figure 6B.

[0079] The shape of the partition rib 25 in plan view is not limited to a circular shape. The shape of the partition rib 25 in plan view may be rectangular. In modified example 2, the shape of the partition rib 25 (and support area 250) in plan view is square. The support area 250 has an area nine times the area of ​​the grid area 243, by tripling each side of the grid area 243. The support area 250 may have an area four times the area of ​​the grid area 243, by doubling each side of the grid area 243.

[0080] (9) Summary As is clear from the first embodiment, the second embodiment and its modifications described above, the transport container 1 of the first embodiment comprises side walls 4 and a plate-shaped bottom wall 2, and opens upward. The bottom wall 2 comprises an outer edge rib 23, a grid rib 24, and a partition rib 25. The outer edge rib 23 is an annular shape in plan view that protrudes downward from the lower surface of the bottom wall 2. The grid rib 24 is a grid shape in plan view that protrudes downward from the lower surface of the bottom wall 2. The partition rib 25 is an annular shape in plan view that protrudes downward from the lower surface of the bottom wall 2. The portion of the lower surface of the bottom wall 2 inside the outer edge rib 23 is defined as the outer edge rib inner region 230. A part of the outer edge rib inner region 230 is defined as a support region 250 that can be contacted by a support member that supports the lower surface of the bottom wall 2. All or part of the outer edge rib inner region 230 excluding the support region 250 is defined as the grid rib forming region 240. The grid rib 24 is formed in the grid rib forming region 240. Partition ribs 25 are formed at the edge of the support area 250. Gate marks 13 are formed in the portion of the bottom wall 2 excluding the support area 250.

[0081] According to the first embodiment, the support member of the conveyor comes into contact with the lower surface of the bottom wall 2 of the transport container 1, and the lower surface of the bottom wall 2 is easily supported by the support member, making it easier to transport stably.

[0082] In the second embodiment, the invention is realized by combining it with the first embodiment. In the second embodiment, the outer rib 23 and the inner region 230 of the outer rib are rectangular in plan view. The support regions 250 are formed at four locations corresponding to at least four corners of the inner region 230 of the outer rib. In plan view, the distance L250 from the center 20 of the bottom wall 2 to the support region 250 corresponding to any of the four corners of the inner region 230 of the outer rib is longer than the distance L13 from the center 20 to the gate mark 13.

[0083] According to the second embodiment, the molten resin constituting the bottom wall 2 can be more easily distributed evenly throughout the entire bottom wall 2.

[0084] In the third embodiment, it is realized by a combination with the first or second embodiment. In the third embodiment, the outer edge rib 23 and the inner region 230 of the outer edge rib are rectangular in plan view. The partition ribs 25A to 25D are formed at four locations corresponding to at least four corners of the inner region 230 of the outer edge rib. In plan view, the distance L25 from the gate mark 13 to the partition ribs 25A to 25D corresponding to any of the four corners of the inner region 230 of the outer edge rib is longer than the distance L23 from this partition rib 25 to the outer edge rib 23.

[0085] According to the third embodiment, a support region 250 with weak bending rigidity, bending strength, and impact resistance is provided near the outer edge rib 23, thereby improving the bending rigidity, bending strength, and impact resistance of the support region 250. [Explanation of symbols]

[0086] 1. Transport container 13 Gate marks 2 Bottom wall 20 center 23 Outer edge rib 230 Outer edge rib region 24 Grid Rib 240 Lattice rib formation region 241 First rib section 242 Second rib piece 243 Grid area 25 compartment ribs 251 Inclined Surface 4. Sidewalls L13 Distance L23 Distance L25 Distance L250 Distance

Claims

1. A transport container having side walls and a plate-shaped bottom wall, and opening upwards, An outer rib that protrudes downward from the lower surface of the bottom wall and has an annular shape in plan view, A grid-like rib in plan view protrudes downward from the lower surface of the bottom wall, The bottom wall comprises an annular partition rib in plan view that protrudes downward from the lower surface of the bottom wall, The portion of the lower surface of the bottom wall inside the outer edge rib is defined as the outer edge rib region. A portion of the outer edge rib region is designated as a support region that can be contacted by the support member that supports the lower surface of the bottom wall. The entire or a part of the outer edge rib region, excluding the support region, is designated as the lattice rib formation region. The lattice ribs are formed in the aforementioned lattice rib forming region. The partition ribs are formed at the edge of the support region. A gate mark is formed in the portion of the bottom wall excluding the support region. A container for transport.

2. The outer edge rib and the region within the outer edge rib are rectangular in shape when viewed from above. The support regions are formed at four locations corresponding to at least four corners within the outer edge rib region, In a plan view, the distance from the center of the bottom wall to the support region corresponding to one of the four corners within the outer edge rib region is longer than the distance from the center to the gate mark. A transport container according to claim 1.

3. The outer edge rib and the region within the outer edge rib are rectangular in shape when viewed from above. The partition ribs are formed at four locations corresponding to at least four corners within the outer edge rib region, In a plan view, the distance from the gate mark to the partition rib corresponding to one of the four corners within the outer edge rib region is longer than the distance from this partition rib to the outer edge rib. A transport container according to claim 1 or 2.

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