Assembly type tray

Abstract

To provide a tray in which compression strength in a stacking state is excellent, collapsing associated with mis-stacking can be prevented, a use area of material is suppressed, and fitting work can be easily performed.SOLUTION: An outer side plate 4 of a side wall 2 is erected from a bottom wall 1. An inner side plate 6 is folded inward via a frame 5. An outwardly folded plate 7 and an inwardly folded plate 8 connected to the outer side plate 4 and the inner side plate 6, respectively, are bent at a corner part, and overlap with the inside of an end wall 3 erected from the bottom wall 1. As the inwardly folded plate 8 is bent from the inner side plate 6, a part near to the corner part of the inner side plate 6 is bent. A prismatic columnar part 13 is formed in the inner side of the part which faces the corner part of the side wall 2. Then, a cross plate 14 continuously connected to an upper end of the end wall 3 is bent so as to cover a top surface of the columnar part 13. An insertion piece 15 of an outer side end of the cross plate 14 is inserted into an opening part of an upper end of the columnar part 13 to maintain its shape.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a knockdown tray that is assembled from a blank. [Background technology]

[0002] A conventional tray of this type is shown in Fig. 12. This tray is assembled from a cardboard blank shown in Fig. 13, and has a shape with a bottom wall 31, a pair of side walls 32 and an end wall 33 around the periphery.

[0003] The side walls 32 of this tray are composed of an outer plate 34, a frame 35, and an inner plate 36, which are successively connected to the bottom wall 31, and the end walls 33 are composed of an outer end plate 37, a frame 38, and an inner end plate 39, which are successively connected to the bottom wall 31.

[0004] An outer folding plate 40 and an inner folding plate 41 are connected to both side ends of the outer plate 34 and the inner plate 36, respectively, and joining protrusions 41a and joining recesses 41b are formed alternately on the inner folding plates 41 on both sides of the paired side walls 32. An engagement notch 36a is formed at the lower end of the boundary between the inner plate 36 and the inner folding plate 41, and engagement protrusions 39a are formed at the lower ends on both sides of the inner end plate 39.

[0005] At the upper edge of the outer end plate 37, fan-shaped crosspieces 42 are provided, split into two on either side of the frame 38, and insertion pieces 43 are provided at the outer ends of the crosspieces 42. Insertion holes 44 are provided in the frame 35 of the side wall 32 at positions slightly away from both ends.

[0006] Then, the outer plates 34 of the side walls 32 rise from the bottom wall 31, the frame 35 and inner plates 36 are sequentially bent inward and downward, respectively, the outer folding plates 40 and inner folding plates 41 are bent at the corners, and the opposing side walls 32 are maintained in an upright position due to the engagement of the joining protrusions 41a and joining recesses 41b. In this state, the tray is sandwiched between the outer end plates 37 and inner end plates 39 of the end walls 33 rising from the bottom wall 31, the engaging protrusions 39a engage with the engaging notches 36a, the crosspieces 42 are bent so as to overlap the frame 35, and the insertion pieces 43 are inserted into the insertion holes 44, thereby maintaining the shape of the tray.

[0007] Also known as this type of tray is the one shown in Figure 14. This tray is assembled from a cardboard blank shown in Figure 15, and has a shape with a bottom wall 51, a pair of side walls 52 and an end wall 53 around the periphery.

[0008] The side walls 52 of this tray are composed of an outer plate 54, a side frame 55, and an inner plate 56, which are successively connected to the bottom wall 51. Side folding plates 57 are connected to both ends of the end wall 53, and end folding plates 58 are connected to both ends of the inner plate 56 of the side wall 52, and a crosspiece plate 59 is provided continuously across the entire width at the upper end of the end wall 53. Insertion pieces 59a are provided at both ends of the crosspiece plate 59, and the frame 55 is provided with insertion holes 55a that communicate with the triangular cutouts 54a in the outer plate 54.

[0009] The side folding plates 57 are sandwiched between the outer plates 54 standing up from the bottom wall 51 and the inner plates 56 bent inward, and the end folding plates 58 are overlapped on the inside of the end walls 53 standing up from the bottom wall 51. The crosspieces 59 are bent inward to overlap the frames 55, and the insertion pieces 59a are inserted into the insertion holes 55a, thereby maintaining the shape of the tray.

[0010] Furthermore, in the following Patent Document 1, the present applicant discloses a tray as shown in Fig. 16. This tray is assembled from a cardboard blank as shown in Fig. 17, and has a shape with a bottom wall 61, each pair of side walls 62 and end walls 63 surrounding the periphery thereof.

[0011] The side walls 62 of this tray are composed of an outer plate 64, a frame 65, and an inner plate 66, which are successively connected to the bottom wall 61, and the end walls 63 are composed of an outer end plate 67, a frame 68, and an inner end plate 69, which are successively connected to the bottom wall 61. An outer folding plate 70 and an inner folding plate 71 are respectively connected to both side ends of the outer plate 64 and the inner plate 66, and these are connected via a frame 72.

[0012] The inner folding plate 71 has mountain fold lines 74 and valley fold lines 75 spaced apart from a valley fold line 73 that forms the boundary with the inner plate 66 of the side wall 62, and the portion between the valley fold lines 73 and 75 forms the column portion 76. The frame 72 is interrupted at the column portion 76, and an opening is formed between the outer folding plate 70 and the inner folding plate 71.

[0013] Protective plates 77 are connected to both side ends of the inner end plate 69 of the end wall 63, and locking protrusions 77a and tabs 77b are provided on the front ends of the protective plates 77. Locking notches 66a are formed in the inner plate 62 of the side wall 62 near both side ends.

[0014] The outer folding plate 70 and the inner folding plate 71 are bent at the corner portions and sandwiched between the outer end plate 67 and the inner end plate 69 of the end wall 63 standing up from the bottom wall 61, and as the inner folding plate 71 is bent from the inner plate 66, the inner folding plate 71 is bent about the two valley fold lines 73, 75 and the mountain fold line 74 as axes, forming a triangular prism-shaped reinforcing column portion 76 on the end wall 63 side of the corner portion. In addition, the protective plate 77 is bent diagonally from the inner end plate 69 to cover the column portion 76, the locking protrusion 77a engages with the locking notch 66a, and the tab 77b is bent so as to fit along the inner surface of the inner plate 66. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Japanese Patent Application Publication No. 2019-1504 Summary of the Invention [Problem to be solved by the invention]

[0016] In the tray shown in Figure 12, when the outer panel 34 and the inner panel 36 are overlapped, the outer folding panel 40 and the inner folding panel 41 overlap, and the opposing side walls 32 are maintained in an upright position due to the engagement of the joining protrusions 41a and the joining recesses 41b. In this state, the inner end panel 39 can be bent inward, the crosspiece 42 can be bent so as to overlap the frame 35, and the insertion piece 43 can be inserted into the insertion hole 44. Therefore, assembly can be done relatively easily even by hand, but since the crosspiece 42 is supported only by the frame 35 of the side wall 32, there are cases where the pressure resistance strength is insufficient.

[0017] Furthermore, in the tray shown in FIG. 14, the crosspiece plates 59 are supported only by the frames 55 of the side walls 52, which may result in insufficient pressure resistance. In addition, the side folding plates 57 extending from the end walls 53 and the end folding plates 58 extending from the side walls 52 are separate, so that during assembly, the side walls 52 and the end walls 53 must be erected at the same time, which creates the problem of difficulty in manual assembly.

[0018] 16 ensures compressive strength, but because there are no crosspieces on the top surface, if the lower tray and the upper tray are slightly misaligned when multiple trays are stacked, the upper tray may fall inside the lower tray, causing the load to collapse. In addition, there is the problem that the area of ​​material used is large due to the presence of inner end plates 69. Furthermore, there are many locking points that must be engaged during assembly, which causes the problem of laborious assembly and disassembly.

[0019] Therefore, this invention aims to provide a tray that has excellent compressive strength when stacked, can prevent cargo from collapsing due to shifting of the stack, requires less material, and can be easily assembled. [Means for solving the problem]

[0020] In order to solve the above-mentioned problems, the present invention provides an assembly-type tray in which adjacent side walls and end walls are connected to each other across a corner portion around a bottom wall, and which can be assembled not only by machine but also by hand, The side wall includes an outer plate, a frame, and an inner plate that are sequentially connected to the bottom wall, and an outer folding plate and an inner folding plate are connected to both side ends of the outer plate and the inner plate, respectively, and the outer folding plate and the inner folding plate are connected via a top edge, In the corner portion of the inner plate of the side wall, mountain fold lines and valley fold lines are sequentially spaced apart from the valley fold line that forms the boundary with the inner folded plate, The inner plate is folded toward the inside of the outer plate standing up from the bottom wall, and the outer folded plate and the inner folded plate are folded at the corner portion and overlapped on the inside of the end wall standing up from the bottom wall, and with the folding about the mountain fold line and the valley fold line as axes, a rectangular columnar portion is formed on the inside of the portion facing the corner portion of the side wall, A batten is connected to the upper end of the end wall, and the batten is bent so as to cover the upper surface of the column portion, and an insertion piece connected to the outer end of the batten is inserted into an opening at the upper end of the column portion to maintain its shape (Configuration 1).

[0021] In the knockdown tray of configuration 1, the side walls are in the length direction around the bottom wall, and the end walls are in the width direction (configuration 2).

[0022] In addition, in the assembled tray of configuration 1, the mountain fold lines and valley fold lines near the corners of the inner plate are made parallel to the valley fold line that forms the boundary between the inner plate and the inner fold plate (configuration 3).

[0023] Furthermore, in the assembled tray of configuration 1, the mountain fold line is located at a position that is 25% to 75% of the length between the two valley fold lines, based on the valley fold line that forms the boundary between the inner plate and the inner fold plate (configuration 4).

[0024] In addition, in the assembled tray of configuration 1, as the outer folding plate and the inner folding plate are folded at the corner portions, a dimensional difference occurs between the outside and inside of the side wall, and the portion between the two valley fold lines of the inner plate is compressed, forming the column portion (configuration 5).

[0025] Furthermore, in the assembled tray of configuration 1, the boundary line between the inner folded plate and the top edge is partially inclined relative to the boundary line between the outer folded plate and the top edge so that the spacing becomes wider toward the opening between the outer plate and the column portion (configuration 6).

[0026] In addition, in the assembled tray of configuration 1, the edge of the frame facing the opening at the upper end of the column is cut diagonally, so that when the insertion piece is inserted into the opening at the upper end of the column, the edge of the insertion piece is pressed against the edge of the frame (configuration 7).

[0027] In addition, in the assembled trays of configurations 1 to 7, in the blank state, the crosspiece is within a range that does not protrude from the tip positions of the outer folding plate and the inner folding plate, and the outer folding plate is cut out to form the insertion piece (configuration 8).

[0028] In the knockdown trays of configurations 1 to 7, the crosspieces are provided in separate pieces near both side edges of the end walls (configuration 9).

[0029] Alternatively, in the knockdown trays of configurations 1 to 7, the crosspieces are provided continuously across the entire width of the end walls (configuration 10).

[0030] In addition, in the assembled trays of configurations 1 to 7, the upper end of the end wall is not connected to a portion that is bent inward to wrap around the outer folding plate and the inner folding plate, and only the crosspiece plate is connected to the upper end (configuration 11). [Effects of the Invention]

[0031] The assembled tray of this invention has cross plates extending from the upper ends of the end walls that overlap the upper surfaces of the pillars formed on the inside of the parts facing the corners of the side walls, and can withstand the load when multiple trays are stacked in layers.This means that the upper trays are supported by a wide area of ​​the cross plates of the lower trays, resulting in excellent compressive strength.In addition, the upper trays are less likely to fall inside the lower trays, preventing cargo from collapsing due to shifting in stacking.

[0032] Furthermore, the insert piece that secures the crosspiece is inserted into the opening at the top end of the column to hold it in the assembled shape, so there is no need to provide a separate notch away from the column for engaging the insert piece.

[0033] Furthermore, by constructing the end wall from a single piece and keeping the crosspiece in a blank state within a range that does not protrude beyond the tip positions of the outer and inner folding plates, the area of ​​material used can be reduced, and manufacturing costs can be reduced, compared to conventional assembled trays with similar internal dimensions and in which the portions corresponding to the outer and inner folding plates that overlap the end wall have similar lengths.

[0034] Furthermore, when assembling from a blank state, the outer folding plate and the inner folding plate, which are erected from the bottom wall together with the side walls, are folded at the corners while overlapping each other, and placed inside the end walls, and the insertion pieces extending from the side ends of the crosspieces are inserted into the openings at the upper ends of the pillars formed on the inner plates, allowing for easy manual assembly. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 1 is an overall perspective view showing an assembled state of a first embodiment of an assembly-type tray according to the present invention; [Figure 2] A diagram showing the tray blank of the same. [Figure 3] FIG. 10 is an overall perspective view showing the initial state of the assembly process of the above. [Figure 4] FIG. 10 is a partial plan view showing the process of forming the column portion of the same. [Figure 5] FIG. 10 is an overall perspective view showing an intermediate state of the assembly process of the above. [Figure 6]FIG. 10 is a partial perspective view showing the process of inserting the insert piece of the slat into the upper end of the column portion. [Figure 7] FIG. 10 is a partial perspective view showing the state in which the inserting piece of the slat is inserted into the upper end of the column portion. [Figure 8] Partial view of the blank showing the insertion piece retention structure [Figure 9] FIG. 10 is a partial plan view showing the insertion state of the insertion piece of the same. [Figure 10] FIG. 10 is an overall perspective view showing the assembled state of a second embodiment of the assembly tray according to the present invention; [Figure 11] A diagram showing the tray blank of the same. [Figure 12] FIG. 1 is an overall perspective view showing an assembled state of an example of a conventional assembly-type tray. [Figure 13] A diagram showing the tray blank of the same. [Figure 14] FIG. 10 is an overall perspective view showing an assembled state of another example of a conventional assembly-type tray. [Figure 15] A diagram showing the tray blank of the same. [Figure 16] An overall perspective view showing the assembled state of the assembly tray described in Patent Document 1 [Figure 17] A diagram showing the tray blank of the same. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0037] First Embodiment (overview) The knockdown tray shown in Fig. 1 is assembled from the cardboard blanks shown in Fig. 2, and has reinforcing structures at the corners to withstand pressure loads. Figs. 3 to 5 show the initial and intermediate states in the assembly process, and Figs. 6 and 7 show enlarged views of the corner locking process and the locked state.

[0038] (blank) As shown in Figure 2, this tray blank has a rectangular bottom wall 1 around which adjacent pairs of lengthwise side walls 2 and widthwise end walls 3 are connected, sandwiching a corner portion therebetween. The corrugation direction, which is the direction in which the corrugation tops of the corrugated cardboard core extend, is oriented along the boundary between the bottom wall 1 and the end wall 3.

[0039] The side wall 2 is composed of an outer plate 4, a frame 5, and an inner plate 6, which are connected in sequence to the bottom wall 1, and an outer folding plate 7 and an inner folding plate 8 are connected to both side ends of the outer plate 4 and the inner plate 6, respectively. The outer folding plate 7 and the inner folding plate 8 are connected via a top edge 9.

[0040] The boundary line between the outer panel 4 and the frame 5 and the boundary line between the frame 5 and the inner panel 6 are lead creases in which pressed creases and cuts are alternately arranged to reduce bending resistance during assembly. The boundary line between the outer panel 4 and the outer folding panel 7 is also lead creases in which pressed creases and cuts are alternately arranged to reduce bending resistance during assembly.

[0041] In the portion of the inner panel 6 near the corner, mountain fold lines 11 and valley fold lines 12 are drawn at intervals from the valley fold line 10 that forms the boundary with the inner folding panel 8, so as to be parallel to the valley fold line 10, and the portion between the valley fold lines 10 and 12 becomes the portion that forms the column portion 13. The frame 5 is interrupted at the portion that forms the column portion 13.

[0042] In the part that constitutes the column portion 13, the mountain fold line 11 is located at a position that is 25% to 75% of the length between the two valley fold lines 10, 12, based on the valley fold line 10 that forms the boundary between the inner panel 6 and the inner fold plate 8.

[0043] The valley fold lines 10 and 12 are reverse creases pressed from the surface of the cardboard, contrary to normal creases, and the mountain fold line 11 is a lead crease in which pressed creases pressed from the back of the cardboard and cuts are alternately arranged.

[0044] At the upper edge of the end wall 3, fan-shaped crosspieces 14 are connected in series near both ends, and insertion pieces 15 are connected to the outer ends of the crosspieces 14. The middle portion sandwiched between the crosspieces 14 at the upper edge of the end wall 3 is an open edge, with no portion connected that is bent inward to wrap around the outer folding plate 7 and the inner folding plate 8.

[0045] The tip position of the crosspiece 14 coincides with the tip positions of the outer folding plate 7 and the inner folding plate 8, and is within a range where it does not protrude from the tip positions of the outer folding plate 7 and the inner folding plate 8. The insertion piece 15 is formed by cutting out the outer folding plate 7.

[0046] 2, the boundary line 16b between the inner folding plate 8 and the top edge 9 is inclined partially relative to the boundary line 16a between the outer folding plate 7 and the top edge 9 so that the gap widens toward the opening 17 between the outer plate 4 and the column 13. As a result, during assembly, the opening at the top end of the column 13 becomes wider on the top edge 9 side, making it easier to insert the insertion piece 15 into the opening.

[0047] (assembly) To assemble the blank, as shown in Figure 3, the outer panel 4 of the side wall 2 is raised from the bottom wall 1, and the inner panel 6 is bent downward. This causes the frame 5 to become nearly horizontal, and the outer panel 7, inner panel 8, and top edge 9 are also bent in the same way as the side wall 2. Note that the outer panel 4 and the inner panel 6 may be bonded together in advance to improve ease of assembly.

[0048] Next, as shown in Figure 4, the outer folding plate 7 and the inner folding plate 8 are folded at right angles from the side wall 2 at the corners. As a result of this folding, a dimensional difference occurs between the outside and inside of the side wall 2, and the part of the inner plate 6 between the two valley fold lines 10, 12 is compressed, so that the part of the inner plate 6 facing the corners is bent around the two valley fold lines 10, 12 and the mountain fold line 11 as axes, and as shown in Figure 5, a triangular prism-shaped column portion 13 is formed on the inside of the part of the side wall 2 facing the corners.

[0049] Next, as shown in FIG. 6, the end wall 3 is raised from the bottom wall 1 so that the outer folding plate 7 and the inner folding plate 8 overlap the inside of the end wall 3.

[0050] Then, the insertion piece 15 is bent from the crosspiece 14 so that the crosspiece 14 covers the top surface of the column 13 as shown in Figure 7, and the insertion piece 15 is inserted into the opening at the top end of the column 13, and the tray is maintained in its assembled state.

[0051] (effect) In the above-described assembled tray, the upper surfaces of the pillars 13 formed on the inside of the corner portions of the side walls 2 are overlapped with the cross plates 14 extending from the upper ends of the end walls 3, thereby supporting the load when multiple trays are stacked in layers. As a result, the upper trays are supported by a wide area of ​​the cross plates 14 of the lower trays, resulting in excellent compressive strength. Furthermore, the upper trays are less likely to fall inside the lower trays, preventing the load from collapsing due to misalignment of the stack.

[0052] In addition, the insertion piece 15 for fixing the crosspiece 14 is inserted into the opening at the upper end of the column part 13 to hold it in the assembled shape, so there is no need to provide a separate notch at a position away from the column part 13 for engaging the insertion piece 15.

[0053] Furthermore, the end wall 3 is made up of a single sheet, the crosspiece 14 is contained in a range in which it does not protrude beyond the tip positions of the outer folding plate 7 and the inner folding plate 8 in its blank state, and the outer folding plate 7 is cut out to form the insertion piece 15. Therefore, compared to conventional assembled trays with similar internal dimensions and in which the portions corresponding to the outer folding plate 7 and the inner folding plate 8 that overlap the end wall 3 are of similar length, the area of ​​material used can be reduced, and manufacturing costs can be reduced.

[0054] Furthermore, when assembling from a blank state, the outer folding plate 7 and the inner folding plate 8, which are erected from the bottom wall 1 together with the side wall 2, are folded at the corners while overlapping each other, and the insertion pieces 15 extending from the side ends of the crosspieces 14 are simply inserted into the openings at the upper ends of the pillars 13 formed in the inner plate 6, allowing for easy manual assembly without the need to lock multiple points.

[0055] Therefore, in the conventional assembled tray shown in Figure 14, there is no need to provide a notch in the outer plate 4 to facilitate the insertion of the insertion piece 15, such as the triangular notch 54a provided in the outer plate 54, and a decrease in pressure resistance strength is prevented.

[0056] As shown in Figure 8, by cutting the edge 18 of the frame 5 facing the opening at the top of the column 13 at an angle, and as shown in Figure 9, by making it so that the edge of the insertion piece 15 is pressed against the edge 18 of the frame 5 when the insertion piece 15 is inserted into the opening at the top of the column 13, the insertion piece 15 will not easily come out of the opening at the top of the column 13. This prevents the lock from being accidentally released when the assembly is complete.

[0057] In addition to cutting the edge 18 of the frame 5 at an angle, the ruled line 19 at the base of the insertion piece 15 may be inclined inward from the base side of the crosspiece 14 to the tip side, so that the edge of the insertion piece 15 tightly fits into the edge 18 of the frame 5.

[0058] Second Embodiment The knockdown tray shown in Fig. 10 is assembled from the cardboard blanks shown in Fig. 11. The basic structure of this tray is the same as that of the first embodiment, but differs from the first embodiment in that the crosspieces 14 are provided continuously across the entire width of the end walls 3.

[0059] In this way, when the crosspieces 14 are arranged across the entire width of the end walls 3, the rigidity in the assembled state is improved and the effect of preventing the collapse of the load due to the shifting of the stacking is improved compared to the tray of the first embodiment. However, the opening area of ​​the top surface is reduced by the crosspieces 14, so the loading and unloading of the contents in the assembled state is restricted.

[0060] <Other> In the above embodiment, the column portion 13 is exemplified as being in the shape of a triangular prism, but by inserting multiple mountain fold lines 11 between the two valley fold lines 10, 12, the column portion 13 may be in the shape of a square prism, etc.

[0061] Although omitted in the above embodiment, engagement protrusions may be provided on the upper ends of the side walls 2 and end walls 3, and engagement holes may be provided on the periphery of the bottom wall 1, so that when stacking multiple trays, the engagement protrusions of the lower trays engage with the engagement holes of the upper trays, thereby reliably preventing the trays from shifting. Also, handle holes for carrying the trays may be provided in the end walls 3. [Explanation of symbols]

[0062] 1 bottom wall 2 side wall 3 End Wall 4 Outer plate 5. Picture Frame 6 Inner plate 7 Outer folding plate 8 Inward fold plate 9 Apical edge 10,12 Taniori line 11 Mountain fold line 13 Pillar section 14. Slats 15 Insert 16a,16b Ruled lines 17 Opening 18 Edge 19 Ruled Lines

Claims

1. The side walls (2) and end walls (3) are connected to each other around the bottom wall (1) with a corner portion in between, The side wall (2) includes an outer plate (4), a frame (5), and an inner plate (6) that are successively connected to the bottom wall (1), and an outer folding plate (7) and an inner folding plate (8) are connected to both side ends of the outer plate (4) and the inner folding plate (6), respectively, and the outer folding plate (7) and the inner folding plate (8) are connected via a top edge (9), In the corner portion of the inner plate (6) of the side wall (2), mountain fold lines (11) and valley fold lines (12) are drawn at intervals from a valley fold line (10) that forms a boundary with the inner folding plate (8), The inner plate (6) is bent toward the inside of the outer plate (4) standing up from the bottom wall (1), and the outer folded plate (7) and the inner folded plate (8) are bent at the corners and overlapped on the inside of the end wall (3) standing up from the bottom wall (1). As a result of the bending about the mountain fold line (11) and the valley fold line (10, 12) as axes, a rectangular columnar portion (13) is formed on the inside of the portion of the side wall (2) facing the corner portion. A crosspiece (14) is connected to the upper end of the end wall (3), and the crosspiece (14) is bent to cover the upper surface of the column portion (13). An insert piece (15) connected to the outer end of the crosspiece (14) is inserted into the opening at the upper end of the column portion (13) to maintain its shape, forming an assembled tray.

2. 2. The tray according to claim 1, wherein the side walls (2) extend lengthwise around the bottom wall (1) and the end walls (3) extend widthwise around the bottom wall (1).

3. 2. The assembly tray according to claim 1, wherein the mountain fold lines (11) and valley fold lines (12) in the corner portions of the inner plate (6) are parallel to the valley fold line (10) that forms the boundary between the inner plate (6) and the inner folding plate (8).

4. 2. The assembly tray according to claim 1, wherein the mountain fold line (11) is located at a position 25% to 75% of the length between the two valley fold lines (10, 12) based on the valley fold line (10) that forms the boundary between the inner panel (6) and the inward folding panel (8).

5. 2. The assembly tray according to claim 1, wherein a difference in dimension occurs between the outer and inner sides of the side wall (2) when the outer folding plate (7) and the inner folding plate (8) are folded at the corners, and the portion of the inner plate (6) between the two valley fold lines (10, 12) is compressed, forming the column portion (13).

6. 2. The assembly tray according to claim 1, wherein the boundary line (16b) between the inner folding plate (8) and the top edge (9) is partially inclined relative to the boundary line (16a) between the outer folding plate (7) and the top edge (9) so that the spacing becomes wider toward the opening between the outer plate (4) and the column portion (13).

7. 2. The assembly tray according to claim 1, wherein the edge (18) of the frame (5) facing the opening at the upper end of the column portion (13) is cut diagonally, and when the insertion piece (15) is inserted into the opening at the upper end of the column portion (13), the edge of the insertion piece (15) is pressed against the edge (18) of the frame (5).

8. An assembly tray according to any one of claims 1 to 7, characterized in that in a blank state, the crosspiece (14) is within a range that does not protrude from the tip positions of the outer folding plate (7) and the inner folding plate (8), and the outer folding plate (7) is cut out to form the insertion piece (15).

9. 8. The knockdown tray according to claim 1, wherein the crosspieces (14) are provided in separate pieces near both ends of the end walls (3).

10. 8. The collapsible tray according to claim 1, wherein the crosspiece (14) is provided continuously across the entire width of the end wall (3).

11. 8. The assembly tray according to claim 1, wherein the upper end of the end wall (3) is not connected to a portion that is bent inward so as to wrap around the outer folding plate (7) and the inner folding plate (8), and only the crosspiece (14) is connected to the upper end of the end wall (3).

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