Tray

Abstract

To provide a tray that enhances work efficiency during assembly and improves stability when stacked.SOLUTION: A tray 1A includes an inner flap 40 connected to a side wall 30 and overlapping the inner surface of an end wall 20, a cross plate 50 connected to the end wall 20, and an engagement piece 60 connected to the cross member 50. An engagement slit 70 is formed extending from the side wall 30 to the inner flap 40. The engagement piece 60 is inserted into an engagement slit 70 from the outside. The upper portion of the side wall 30 and the upper portion of the inner flap 40 are connected via an upper fold line L1. The lower portion of the side wall 30 and the lower portion of the inner flap 40 are connected via two lower fold lines L2, L2. At an upper edge portion 30b of the side wall 30, the region where the cross plate 50 overlaps is positioned inward relative to the edge of a bottom plate 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Among cardboard trays, there is one in which crosspieces are connected to the upper edges of the front and rear end walls, and engagement slits extending horizontally are formed in the left and right side walls, and the lower parts of the engagement pieces connected to the crosspieces are inserted into the engagement slits from the outside (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-25135 Summary of the Invention [Problem to be solved by the invention]

[0004] In the process of assembling the conventional tray described above, when inserting the engaging pieces into the engaging slits, the engaging slits are in a closed state, which makes it difficult to insert the engaging pieces into the engaging slits.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a tray that can improve the efficiency of assembly work and increase the stability when trays are stacked. [Means for solving the problem]

[0006] To solve the above problems, a first invention provides a tray comprising a bottom plate, front and rear end walls and left and right side walls connected to the bottom plate, inner flaps connected to the front and rear edges of the side walls and overlapping the inner surfaces of the end walls, crosspieces connected to the upper edges of the end walls, and engagement pieces connected to the left and right edges of the crosspieces. An engagement slit is formed extending laterally from the side walls to the inner flaps, and a lower portion of the engagement piece is inserted into the engagement slit from the outside. An upper fold line connects the upper portion of the side wall to the upper portion of the inner flaps, and two lower fold lines connect the lower portion of the side wall to the lower portion of the inner flaps, with the horizontal distance between the two lower fold lines increasing upward. The lower end of the upper fold line is connected to the engagement slit, and the upper ends of the two lower fold lines are connected to the engagement slits on both sides of the lower end of the upper fold line. At least a portion of the upper edge of the side wall where the crosspiece overlaps is located more inward than the left and right edges of the bottom plate.

[0007] To solve the above problem, a second invention provides a tray comprising a bottom plate, front and rear end walls and left and right side walls connected to the bottom plate, inner flaps connected to the front and rear edges of the side walls and overlapping the inner surfaces of the end walls, crosspieces connected to the upper edges of the end walls, and engagement pieces connected to the left and right edges of the crosspieces. An engagement slit is formed extending laterally from the side walls to the inner flaps, and a lower portion of the engagement piece is inserted into the engagement slit from the outside. An upper fold line connects the upper portion of the side wall to the upper portion of the inner flaps, and two lower fold lines connect the lower portion of the side wall to the lower portion of the inner flaps, with the horizontal distance between the two lower fold lines increasing upward. The lower end of the upper fold line is connected to the engagement slit, and the upper ends of the two lower fold lines are connected to the engagement slits on both sides of the lower end of the upper fold line. At least a portion of the upper edge of the side wall where the crosspiece overlaps is located outside the left and right edges of the bottom plate.

[0008] When assembling the tray of the present invention, when the inner flap is folded inward relative to the side wall, the upper part of the inner flap is folded relative to the upper part of the side wall at one upper fold line, and the lower part of the inner flap is folded relative to the lower part of the side wall at two lower fold lines. When the inner flap bends relative to the side wall, the lower part of the side wall is pushed outward and the upper part of the side wall is pulled inward. This opens the engagement slit in the left-right direction, making it easier to insert the lower part of the engagement piece into the engagement slit.

[0009] In the first aspect of the present invention, at least a portion of the upper edge of the side wall where the crosspieces overlap is located inward relative to the left-right edges of the bottom plate. With this configuration, when the trays are stacked, the upper edge of the side wall of the lower tray reliably abuts against the underside of the bottom surface of the upper tray, allowing the trays to be stacked stably.

[0010] In the second aspect of the present invention, at least a portion of the upper edge of the side wall where the crosspieces overlap is positioned outward from the left-right edges of the bottom plate. In this configuration, the left-right width of the crosspiece is greater than the left-right width of the bottom plate. Therefore, when the trays are stacked, the bottom surface of the upper tray rests securely on the crosspiece of the lower tray, allowing the trays to be stacked stably.

[0011] In the second aspect of the present invention, it is preferable that a protruding piece protruding upward is formed on the upper edge of the side wall at a location where the crosspiece does not overlap. In this configuration, when the trays are stacked, the protruding piece of the lower tray is positioned on the outer surface of the side wall of the upper tray, thereby preventing the upper tray from shifting left and right relative to the lower tray.

[0012] In the tray, it is preferable that a bending assist line is formed from the upper edge of the side wall to the engagement slit. In this way, when the inner flap is folded against the side wall, the area of ​​the upper part of the side wall that is closer to the inner flap than the bending assist fold line is more likely to be pulled inward, causing the engagement slit to open widely.

[0013] In the tray, it is preferable to increase the opening width of the engagement slit by thinning the side wall below the engagement slit by crushing it in the thickness direction.

[0014] In the above-mentioned tray, it is preferable that a notch extending upward is formed at the end of the engagement slit on the side wall side, and that a protrusion is formed on the engagement piece that engages with the upper edge of the engagement slit from below.

[0015] In this configuration, the protruding portion of the engagement piece engages with the upper edge of the engagement slit, thereby preventing the engagement piece from slipping out of the engagement slit. When removing the engagement piece from the engagement slit, the upper edge of the engagement slit is pushed inward to separate the upper edge of the engagement slit from the protruding portion of the engagement piece. In the above-described configuration, an upward notch is formed at the other end of the engagement slit, so when the upper edge of the engagement slit is pushed inward, the upper edge of the engagement slit can be pushed in significantly, which makes it easy to remove the engagement piece from the engagement slit.

[0016] In the above-mentioned tray, the engaging piece has a recessed portion recessed upward, and by inserting the side wall below the engaging slit into the recessed portion, the engaging piece can be prevented from shifting relative to the side wall, and the crosspiece can be stabilized. [Effects of the Invention]

[0017] In the tray of the present invention, when the inner flaps are folded against the side walls, the engaging slits automatically open, making it easy to insert the engaging pieces into the engaging slits, thereby improving work efficiency during assembly. Furthermore, when the trays of the present invention are stacked, the upper trays can be reliably supported by the lower trays, allowing the trays to be stacked stably. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the tray according to the first embodiment of the present invention, as seen from the upper front left. [Figure 2] 3A and 3B are diagrams showing blank sheets for a tray according to the first embodiment of the present invention; [Figure 3] FIG. 2 is a perspective view showing a state before end walls of the tray according to the first embodiment of the present invention are assembled. [Figure 4] 1 is a perspective view showing a state in which an inner flap is folded relative to a side wall in a tray according to a first embodiment of the present invention. FIG. [Figure 5] 1 is a perspective view showing a state in which an engagement piece is inserted into an engagement slit in the tray according to the first embodiment of the present invention. FIG. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. 1, showing the tray according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a cross-sectional view of the trays according to the first embodiment of the present invention in a stacked state. [Figure 8] FIG. 10 is a plan view showing a first modified example of the tray according to the first embodiment of the present invention. [Figure 9] 10A and 10B are diagrams showing blank sheets of a first modified example of the tray according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a plan view showing a second modified example of the tray according to the first embodiment of the present invention. [Figure 11] 10A and 10B are diagrams showing blank sheets of a second modified example of the tray according to the first embodiment of the present invention. [Figure 12] FIG. 10 is a perspective view of a tray according to a second embodiment of the present invention, as viewed from the upper front left. [Figure 13] 10A and 10B are diagrams showing blank sheets for a tray according to a second embodiment of the present invention; [Figure 14] 14 is a cross-sectional view of the tray according to the second embodiment of the present invention taken along line XIV-XIV of FIG. 12. FIG. [Figure 15] FIG. 10 is a cross-sectional view of a stacked state of trays according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description of each embodiment, the same components are denoted by the same reference numerals, and duplicated descriptions will be omitted. In the following description, the front, rear, left and right directions are set for the convenience of describing the tray of this embodiment, and do not limit the configuration or usage state of the tray.

[0020] [First embodiment] 1, the tray 1A of the first embodiment includes a bottom plate 10, front and rear end walls 20, 20 and left and right side walls 30, 30 connected to the bottom plate 10, and inner flaps 40 connected to the front and rear edges of the side walls 30. The tray 1A also includes front and rear crosspieces 50, 50 connected to the upper edges of the end walls 20, 20, and engagement pieces 60 connected to the left and right edges of the crosspieces 50.

[0021] The tray 1A is formed by mountain or valley folding a blank sheet S1 cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S1 shown in Fig. 2 is arranged so that the inner surface is visible. The fold lines of the blank sheet S1 are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S1. Note that the creases may also be formed with intermittent slits, which makes it easier to fold the blank sheet S1 at the creases. Alternatively, the folded lines may be formed by forming half-cut slits that cut only the surface of the sheet or by forming intermittent linear slits that penetrate the sheet.

[0022] The bottom plate 10 is formed in a rectangular shape, as shown in Figure 3. Front and rear end walls 20, 20 are connected to the front and rear edges of the bottom plate 10, and left and right side walls 30, 30 are connected to the left and right edges of the bottom plate 10.

[0023] As shown in Figure 1, the front end wall 20 is connected to the front edge of the bottom plate 10 via a fold line and extends upward from the front edge of the bottom plate 10. The rear end wall 20 is connected to the rear edge of the bottom plate 10 via a fold line and extends upward from the rear edge of the bottom plate 10. The front and rear end walls 20, 20 are formed in the same rectangular shape. The front and rear end walls 20, 20 are formed perpendicular to the bottom plate 10.

[0024] A connecting hole 11 penetrates the center in the left-right direction at the corner between the bottom plate 10 and the end wall 20. In addition, a connecting portion 12 protrudes upward at the center in the left-right direction at the upper edge of the end wall 20.

[0025] A front crosspiece 50 is connected to the upper edge of the front end wall 20 via a folding line. The front crosspiece 50 is formed in a strip shape along the upper edge of the front end wall 20. The front crosspiece 50 is formed perpendicular to the front end wall 20. The middle part in the left-right direction of the leading edge (rear edge) of the front crosspiece 50 is recessed forward.

[0026] A left front engagement piece 60 is connected to the left edge of the front crosspiece 50 via a folding line (see FIG. 3). The left front engagement piece 60 extends downward from the left edge of the crosspiece 50. The upper part of the left front engagement piece 60 is overlapped with the outer surface of the left side wall 30. The lower part of the left front engagement piece 60 is inserted into an engagement slit 70, which will be described later.

[0027] 5, a protrusion 61 that protrudes rearward is formed at the lower rear edge of the left front engagement piece 60. The upper edge of the protrusion 61 is parallel to the upper edge of the engagement piece 60. A recess 62 extending obliquely upward and rearward is formed in the lower part of the front edge of the left front engagement piece 60 (see FIG. 2).

[0028] As shown in Fig. 1, a right front engagement piece 60 is connected to the right edge of the front crosspiece 50 via a folding line (see Fig. 3). The right front engagement piece 60 is formed symmetrically with the left front engagement piece 60.

[0029] A rear crosspiece 50 is connected to the upper edge of the rear end wall 20. The rear crosspiece 50 is formed symmetrically with the front crosspiece 50 in the front-rear direction. Left and right engagement pieces 60, 60 are connected to the left and right edges of the rear crosspiece 50 (see FIG. 3). The two rear engagement pieces 60, 60 are formed symmetrically with the two front engagement pieces 60, 60, respectively.

[0030] The left side wall 30 is connected to the left edge of the bottom plate 10 via a folding line and extends upward from the left edge of the bottom plate 10. The left side wall 30 is formed in a substantially rectangular shape. As shown in Figure 4, a front left inner flap 40 is connected to the front edge of the left side wall 30. The front left inner flap 40 extends rightward from the front edge of the left side wall 30. The inner flap 40 is formed perpendicular to the side wall 30.

[0031] The upper part of the side wall 30 and the upper part of the inner flap 40 are connected via a single upper fold line L1. The upper fold line L1 is a ruled line formed on the inner surface of the blank sheet S1 (see FIG. 2). The upper fold line L1 is a boundary line between the upper part of the side wall 30 and the upper part of the inner flap 40. The upper fold line L1 is formed perpendicular to the upper edges of the side wall 30 and the inner flap 40 (see FIG. 2).

[0032] The lower portion of the side wall 30 and the lower portion of the inner flap 40 are connected via two lower fold lines L2, L2. The lower fold line L2 is a ruled line formed on the inner surface of the blank sheet S1 (see FIG. 2). The two lower fold lines L2, L2 form the boundary between the lower portion of the side wall 30 and the lower portion of the inner flap 40.

[0033] The lower ends of both lower folded lines L2, L2 are connected to the vertices of the corners of the bottom plate 10. In this manner, the lower ends of both lower folded lines L2, L2 are connected. The upper ends of the lower folded lines L2, L2 are spaced apart in the horizontal direction and are located on both sides of the lower end of the upper folded line L1. The horizontal distance between the two lower folded lines L2, L2 increases from the bottom end to the top end (see Figure 2). In other words, the two lower folded lines L2, L2 are arranged in a V-shape, and a triangular region R1 is formed between the two lower folded lines L2, L2.

[0034] The lower fold line L2 on the side wall 30 side is inclined toward the side wall 30 with respect to the normal to the upper surface of the bottom plate 10. The inclination angle of the lower fold line L2 on the side wall 30 side is not limited, but it is preferable that the inclination angle be between 15 degrees and 30 degrees with respect to the normal to the upper surface of the bottom plate 10. The lower fold line L2 on the inner flap 40 side is inclined toward the inner flap 40 with respect to the normal to the upper surface of the bottom plate 10. The inclination angle of the lower fold line L2 on the inner flap 40 side is not limited, but it is preferable that the inclination angle be between 15 degrees and 30 degrees with respect to the normal to the upper surface of the bottom plate 10. Furthermore, the angle of inclination of the lower fold line L2 on the side wall 30 side and the angle of inclination of the lower fold line L2 on the inner flap 40 side may be different from each other, but it is preferable that they are the same angle.

[0035] A left front engagement slit 70 is formed in the left side wall 30 and the left front inner flap 40 (see FIG. 2). The left front engagement slit 70 extends laterally from the front portion of the left side wall 30 to the left portion of the left front inner flap 40. The engagement slit 70 is a linear cut that penetrates the side wall 30 and the inner flap 40. In the state of the blank sheet S1 (see FIG. 2), the upper and lower edges of the engagement slit 70 are in contact with each other, and the engagement slit 70 is closed.

[0036] The engagement slit 70 is disposed at the heightwise intermediate portion of the side wall 30 and the inner flap 40. The lower end of the upper fold line L1 is connected to the front portion of the engagement slit 70. In addition, the upper ends of both lower fold lines L2, L2 are connected to the front portion of the engagement slit 70 on both sides of the lower end of the upper fold line L1.

[0037] The portion of the engagement slit 70 on the side wall 30 side is disposed so that the rear portion is lower than the front portion, and an inclined portion is formed between the front and rear portions (see FIG. 2). An end 71 of the engagement slit 70 on the side wall 30 side is located forward of the center in the front-to-rear direction of the side wall 30. An upwardly extending notch 72 is formed in the end 71 of the engagement slit 70 on the side wall 30 side. This notch 72 is folded back forward into a semicircular shape.

[0038] A bending assist fold line L3 is formed on the left side wall 30, extending from the upper edge 30b to the rear of the engagement slit 70. The bending assist fold line L3 is a crease formed on the inner surface of the blank sheet S1 (see FIG. 2). The bending assist fold line L3 is formed perpendicular to the upper edge 30b of the side wall 30.

[0039] At the portion of the engaging slit 70 on the side wall 30 side, the side wall 30 is crushed in the thickness direction and thinned below the engaging slit 70. It is preferable that at least the lower side of the inclined portion of the engaging slit 70 is thinned.

[0040] 5, the lower part of the left front engagement piece 60 is inserted from the outside into the left front engagement slit 70. As a result, the upper part of the engagement piece 60 overlaps the outer surface of the side wall 30, and the lower part overlaps the inner surface of the side wall 30. The upper edge of the protrusion 61 of the engagement piece 60 engages with the upper edge of the engagement slit 70 from below. In other words, the upper edge of the protrusion 61 engages with the edge of the side wall 30 above the engagement slit 70 from below. The edge of the side wall 30 below the engagement slit 70 is inserted into the recess 62 of the engagement piece 60 .

[0041] As shown in Figure 3, a left rear inner flap 40 is connected to the rear edge of the left side wall 30. The left rear inner flap 40 is formed symmetrically with the left front inner flap 40 in the front-to-rear direction. 2, the upper portion of the left side wall 30 and the upper portion of the left rear inner flap 40 are connected via one upper fold line L1, and the lower portion of the left side wall 30 and the lower portion of the left rear inner flap 40 are connected via two lower fold lines L2, L2.

[0042] As shown in Figure 3, a rear left engagement slit 70 is formed in the left side wall 30 and the rear left inner flap 40. The rear left engagement slit 70 is formed symmetrically with the front left engagement slit 70.

[0043] The right side wall 30 is formed symmetrically with the left side wall 30. Furthermore, front and rear inner flaps 40, 40 are connected to the right side wall 30, just like the left side wall 30. Furthermore, front and rear engagement slits 70, 70 are also formed in the right side wall 30 and the front and rear inner flaps 40, 40.

[0044] As shown in Fig. 1, left and right engagement pieces 60, 60 connected to the front crosspiece 50 are inserted into the left and right engagement slits 70, 70 on the front side, respectively. Furthermore, left and right engagement pieces 60, 60 connected to the rear crosspiece 50 are inserted into the left and right engagement slits 70, 70 on the rear side, respectively.

[0045] 6, in the tray 1A of the first embodiment, the distance L10 between the left and right edges of the crosspiece 50 is the same as the distance L20 between the left and right edges of the bottom plate 10. In this configuration, when the engagement pieces 60 connected to the edges of the crosspiece 50 are inserted into the engagement slits 70, the engagement pieces 60 enter further into the tray 1A than the edges of the bottom plate 10. As a result, the upper parts of the engagement pieces 60 push the upper parts 30a of the side walls 30 into the inside of the tray 1A. In the tray 1A of the first embodiment, the portion of the upper edge 30b of the side wall 30 where the crosspiece 50 overlaps is located more inward (toward the center in the left-right direction of the bottom plate 10) than the left-right edge of the bottom plate 10. In other words, the left-right distance L30 between the upper edge portions 30b, 30b of both side walls 30, 30 is narrower than the left-right distance L20 of the bottom plate 10. In the first embodiment of the tray 1A, the upper edge portion 30b of the side wall 30 is pushed inward by the front and rear engagement pieces 60, 60 (see Figure 1), so that the entire upper edge portion 30b of the side wall 30 is positioned inward relative to the left and right edges of the bottom plate 10.

[0046] When assembling the tray 1A of the first embodiment, the left and right side walls 30, 30 are raised relative to the bottom plate 10, and then the front and rear inner flaps 40, 40 are folded inward relative to the side walls 30, as shown in FIG. 4, the upper part of the inner flap 40 is bent relative to the upper part of the side wall 30 at one upper fold line L1. Also, the lower part of the inner flap 40 is bent relative to the lower part of the side wall 30 at two lower fold lines L2, L2. As a result, a triangular region R1 whose width increases from the lower end toward the top is formed between the lower part of the inner flap 40 and the lower part of the side wall 30.

[0047] By forming such region R1 between the lower part of the inner flap 40 and the lower part of the side wall 30, the lower part of the side wall 30 is pushed outward. Also, the upper part of the side wall 30 is pulled inward. Then, the upper part of the side wall 30 is bent at the bending assist fold line L3, and the region R2 on the inner flap 40 side of the bending assist fold line L3 is tilted inward. In this way, the lower edge of the engagement slit 70 is pushed outward and the upper edge of the engagement slit 70 is pulled inward, so that the engagement slit 70 opens in the left and right directions.

[0048] Next, as shown in FIG. 1, the worker raises the front and rear end walls 20, 20 relative to the bottom plate 10, overlaps the end walls 20 on the outer surfaces of the inner flaps 40, and bends the engaging pieces 60 relative to the crosspieces 50. Furthermore, as shown in FIG. 5, the worker bends the crosspiece 50 inward relative to the end wall 20 and inserts the lower portion of the engagement piece 60 into the engagement slit 70 from the outside of the side wall 30.

[0049] When the engagement piece 60 is inserted into the engagement slit 70, the upper edge of the protrusion 61 of the engagement piece 60 engages with the upper edge of the engagement slit 70 from below. Also, the lower side wall 30 of the engagement slit 70 is inserted into the recess 62 of the engagement piece 60. 1, the front and rear crosspieces 50, 50 are fixed to the left and right side walls 30, 30 by inserting the front, rear, left and right engagement pieces 60 into the front, rear, left and right engagement slits 70, respectively. This completes the assembly work of the tray 1A having the front and rear crosspieces 50, 50.

[0050] To open the crosspiece 50 after assembling the tray 1A, the upper edge of the engagement slit 70 on the side wall 30 side shown in Fig. 5 is pushed inward. In this way, the upper edge of the engagement slit 70 moves inward relative to the protrusion 61 of the engagement piece 60, and the engagement between the protrusion 61 of the engagement piece 60 and the upper edge of the engagement slit 70 is released. This allows the lower part of the engagement piece 60 to be pulled out of the engagement slit 70, and the crosspiece 50 can be opened.

[0051] In the tray 1A described above, as shown in Figure 4, when the inner flap 40 is folded against the side wall 30 during assembly, the lower part of the side wall 30 is pushed outward and the upper part of the side wall 30 is pulled inward, thereby opening the engagement slit 70. In addition, in the tray 1A of the first embodiment, when the inner flap 40 is folded relative to the side wall 30, the upper part of the side wall 30 is easily pulled inward by the bending assist fold line L3, so that the engagement slit 70 is left in a wide open state. Furthermore, in the tray 1A of the first embodiment, the side wall 30 below the engagement slit 70 is thin, so the opening width of the engagement slit 70 is large. Furthermore, in the first embodiment of the tray 1A, the upper edge 30b of the side wall 30 is pushed inward by the front and rear engagement pieces 60, 60, and the entire upper edge 30b where the crosspiece 50 of the side wall 30 overlaps is positioned more inward than the left and right edges of the bottom plate 10, causing the engagement slit 70 to open wider.

[0052] In this way, in the tray 1A of the first embodiment, the engagement slit 70 automatically opens when the inner flap 40 is folded relative to the side wall 30, making it easier to insert the engagement piece 60 into the engagement slit 70, as shown in Fig. 5. Therefore, the tray 1A of the first embodiment can improve work efficiency during assembly.

[0053] In the tray 1A of the first embodiment, the protruding portion 61 of the engagement piece 60 engages with the upper edge of the engagement slit , so that the engagement piece 60 can be reliably engaged with the engagement slit . In the first embodiment of the tray 1A, the lower side wall 30 of the engagement slit 70 is inserted into the recess 62 of the engagement piece 60, thereby preventing the engagement piece 60 from shifting relative to the side wall 30 and stabilizing the crosspiece 50.

[0054] In the first embodiment of the tray 1A, a notch 72 is formed in the end 71 of the engagement slit 70 on the side wall 30 side, and the upper edge of the engagement slit 70 can be pushed inward significantly, making it easy to remove the engagement piece 60 from the engagement slit 70.

[0055] In the tray 1A of the first embodiment, as shown in Fig. 6, the upper edge portions 30b of the side walls 30 are positioned more inward than the left-right edges of the bottom plate 10. In this configuration, as shown in Fig. 7, when two trays 1A are stacked, the upper edge portions 30b of both side walls 30 of the lower tray 1A reliably abut against the underside of the bottom plate 10 of the upper tray 1A. Furthermore, when the trays 1A shown in FIG. 1 are stacked, the front and rear connecting portions 12, 12 of the lower tray 1A are inserted into the front and rear connecting holes 11, 11 of the upper tray 1A, respectively. In this way, when the trays 1A of the first embodiment are stacked, the upper tray 1A can be reliably supported by the lower tray 1A, so that a plurality of trays 1A can be stacked stably. Furthermore, the upper edges 30b, 30b of both side walls 30, 30 of the lower tray 1A are securely in contact with the underside of the bottom plate 10 of the upper tray 1A, allowing the abutting side surfaces to support the load, thereby improving the compressive strength of the tray.

[0056] Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment and can be modified as appropriate within the scope of the invention. In the upper edge portion 30b of the side wall 30 of the tray 1A of the first embodiment shown in FIG. 1, at least a part of the portion where the crosspiece 50 overlaps may be configured to be positioned more inward than the left-right edges of the bottom plate 10.

[0057] For example, as in the tray 1B shown in Fig. 8, the left and right edges of the crosspiece 50 may be formed so as to incline outward in the left and right direction from the base end (towards the end wall 20) to the tip end (towards the center of the tray 1B in the front-to-rear direction). In the tray 1B, the width of the crosspiece 50 in the left and right direction increases from the base end to the tip end. The tray 1B is assembled from a blank sheet S2 shown in Fig. 9. 8, the edges of the crosspiece 50 are inclined so that part of the distance between the left and right edges of the crosspiece 50 is smaller than the distance between the left and right edges of the bottom plate 10. The angle of inclination of the edges of the crosspiece 50 is not limited, but in the case of the tray 1B, the edges are inclined by 3 degrees with respect to the left and right edges of the bottom plate 10. In this configuration, the engagement pieces 60 push the upper portions of the side walls 30 into the inside of the tray 1B, so that at least a portion of the upper edge portions 30b of the side walls 30 where the crosspieces 50 overlap is positioned more inward than the left-right edges of the bottom plate 10. As a result, the entire upper edge portions 30b of the side walls 30 are positioned more inward than the left-right edges of the bottom plate 10.

[0058] 10, the left and right edges of the crosspiece 50 may be formed so as to incline inward in the left and right direction from the base end (toward the end wall 20) to the tip end (toward the center of the tray 1B in the front-to-rear direction). In the tray 1C, the left and right width of the crosspiece 50 decreases from the base end to the tip end. The tray 1C is assembled from a blank sheet S3 shown in FIG. 11. 10, the edges of the crosspiece 50 are inclined so that part of the distance between the left and right edges of the crosspiece 50 is smaller than the distance between the left and right edges of the bottom plate 10. The angle of inclination of the edges of the crosspiece 50 is not limited, but in the case of the tray 1C, the edges are inclined by 5 degrees relative to the left and right edges of the bottom plate 10. In this configuration, the engagement pieces 60 push the upper portions of the side walls 30 into the inside of the tray 1C, so that at least a portion of the upper edge portions 30b of the side walls 30 where the crosspieces 50 overlap is positioned laterally inward of the left-right edges of the bottom plate 10. As a result, the entire upper edge portions 30b of the side walls 30 are positioned laterally inward of the left-right edges of the bottom plate 10.

[0059] 1, the tray 1A of the first embodiment is provided with front and rear crosspieces 50, 50, but the crosspieces 50 may be provided only on the front or rear side. In addition, the shapes of the engagement pieces 60 and engagement slits 70 are not limited, and the engagement pieces 60 and engagement slits 70 may be provided only on the left or right side.

[0060] Furthermore, there is no limitation on the angle of inclination of the lower fold line L2 relative to the perpendicular to the upper surface of the bottom plate 10. If the angle of inclination of the lower fold line L2 on the inner flap 40 side is increased, the amount by which the lower part of the side wall 30 is pushed out when the inner flap 40 is folded relative to the side wall 30 can be increased, and the opening width of the engagement slit 70 can be increased.

[0061] Although the tray 1A of the first embodiment is made of corrugated cardboard, the tray may also be made of various known paperboards.

[0062] [Second embodiment] As shown in Fig. 12, the tray 1D of the second embodiment has a configuration substantially similar to that of the tray 1A of the first embodiment (see Fig. 1). The tray 1D of the second embodiment differs from the tray 1A of the first embodiment (see Fig. 1) in that the portion of the upper edge portion 30b of the side wall 30 where the crosspiece 50 overlaps is positioned further outward than the left-right edges of the bottom plate 10.

[0063] The tray 1D of the second embodiment is formed by mountain-folding or valley-folding a blank sheet S4 shown in Fig. 13 at each fold line. The blank sheet S4 shown in Fig. 13 is arranged so that the inner surface is visible.

[0064] In the tray 1D of the second embodiment, the distance L10 between the left and right edges of the crosspiece 50 is greater than the distance L20 between the left and right edges of the bottom plate 10, as shown in FIG. In the tray 1D of the second embodiment, the upper portion of the engagement piece 60 is positioned outside the edge of the bottom plate 10, and therefore the portion of the upper edge 30b of the side wall 30 where the crosspiece 50 overlaps is positioned outside the left-right edge of the bottom plate 10 (on the side opposite the center of the bottom plate 10 in the left-right direction). As a result, the side wall 30 is inclined so as to protrude outward in the left-right direction from the lower end to the upper end.

[0065] 12, in the tray 1D of the second embodiment, a protruding piece 31 that protrudes upward is formed at the upper edge of the side wall 30 in a region between the front and rear cross plates 50, 50. The protruding piece 31 is a strip-shaped region that extends in the front-rear direction.

[0066] As shown in Figure 15, when the trays 1D are stacked, the left-right width of the crosspiece 50 of the lower tray 1D is greater than the left-right width of the bottom plate 10 of the upper tray 1D, so that the bottom plate 10 of the upper tray 1D rests securely on the crosspiece 50 of the lower tray 1D. Furthermore, the left and right protruding pieces 31, 31 of the lower tray 1D are respectively arranged on the outer surfaces of the left and right side walls 30, 30 of the upper tray 1D. In this way, the bottom of the upper tray 1D is sandwiched between the left and right protruding pieces 31, 31 of the lower tray 1D, thereby preventing the upper tray 1D from shifting left and right relative to the lower tray 1D. Furthermore, when the trays 1D shown in FIG. 12 are stacked, the front and rear connecting portions 12, 12 of the lower tray 1D are inserted into the front and rear connecting holes 11, 11 of the upper tray 1D, respectively. In this way, when the trays 1D of the second embodiment are stacked, the upper tray 1D can be reliably supported by the lower tray 1D, so that a plurality of trays 1D can be stacked stably.

[0067] The second embodiment of the present invention has been described above, but the present invention is not limited to the second embodiment, and similar to the first embodiment, it can be modified as appropriate within the scope of the spirit thereof. For example, in the upper edge portion 30b of the side wall 30 of the tray 1D shown in FIG. 12, at least a part of the portion where the crosspiece 50 overlaps may be configured to be positioned outside the left-right edges of the bottom plate 10. [Explanation of symbols]

[0068] 1A Tray (first embodiment) 1B Tray (first modified example of the first embodiment) 1C Tray (second modified example of the first embodiment) 1D Tray (Second embodiment) 10 Bottom plate 11 Connection hole 12 Connecting part 20 End Wall 30 side wall 31 Projecting piece 40 Inner flap 50 slats 60 Engagement piece 61 Protrusion 62 recess 70 Engagement slit 71 End L1 Upper broken line L2 Lower broken line L3 bending auxiliary broken line S1 Blank sheet (first embodiment) S2 Blank sheet (first modified example of the first embodiment) S3 Blank sheet (second modified example of the first embodiment) S4 Blank sheet (second embodiment)

Claims

1. The bottom plate and front and rear end walls and left and right side walls connected to the bottom plate; an inner flap connected to the front-rear edge of the side wall and overlapping the inner surface of the end wall; a crosspiece connected to an upper edge of the end wall; and engaging pieces provided continuously at the left and right edges of the crosspiece, An engagement slit is formed extending laterally from the side wall to the inner flap, The lower portion of the engagement piece is inserted into the engagement slit from the outside, an upper portion of the side wall and an upper portion of the inner flap are connected via an upper fold line; The lower portion of the side wall and the lower portion of the inner flap are connected via two lower folding lines, The horizontal distance between the two lower folded lines is formed to increase as it goes upward, a lower end of the upper folded line connected to the engagement slit; the upper ends of the lower folded lines are connected to the engagement slits on both sides of the lower end of the upper folded line; A tray characterized in that at least a portion of the upper edge of the side wall where the crosspiece overlaps is located more inward than the left and right edges of the bottom plate.

2. The bottom plate and front and rear end walls and left and right side walls connected to the bottom plate; an inner flap connected to the front-rear edge of the side wall and overlapping the inner surface of the end wall; a crosspiece connected to an upper edge of the end wall; and engaging pieces provided continuously at the left and right edges of the crosspiece, An engagement slit is formed extending laterally from the side wall to the inner flap, The lower portion of the engagement piece is inserted into the engagement slit from the outside, an upper portion of the side wall and an upper portion of the inner flap are connected via an upper fold line; The lower portion of the side wall and the lower portion of the inner flap are connected via two lower folding lines, The horizontal distance between the two lower folded lines is formed to increase as it goes upward, a lower end of the upper folded line connected to the engagement slit; the upper ends of the lower folded lines are connected to the engagement slits on both sides of the lower end of the upper folded line; A tray characterized in that at least a portion of the upper edge of the side wall where the crosspiece overlaps is positioned outside the left and right edges of the bottom plate.

3. 3. The tray of claim 2, A tray characterized in that a protruding piece protruding upward is formed at the upper edge of the side wall in a portion where the crosspiece does not overlap.

4. The tray according to claim 1 or claim 2, A tray characterized in that a bending assist line is formed from the upper edge of the side wall to the engagement slit.

5. The tray according to claim 1 or claim 2, A tray characterized in that the side wall is crushed in the thickness direction below the engagement slit.

6. The tray according to claim 1 or claim 2, An upwardly extending notch is formed at an end of the engagement slit on the side wall side, The tray is characterized in that the engaging piece is formed with a protrusion that engages with the upper edge of the engaging slit from below.

7. The tray according to claim 1 or claim 2, The engagement piece has a recessed portion recessed upward, A tray characterized in that the side wall below the engagement slit is inserted into the recess.

Images