Tray

Abstract

The present invention provides a tray in which the corners are perpendicular to the base plate while the side walls are inclined inward. [Solution] A tray 1A comprising a base plate 10, a first side wall (end wall 20) connected to a pair of opposing edges of the base plate 10, and a second side wall (side wall 30) connected to another pair of opposing edges of the base plate 10, wherein a rib portion 50 is connected to the upper end of the first side wall, a bent piece 60 is connected to the rib portion 50 and covers the outer surface of the second side wall, and an insert piece 70 is connected to the bent piece 60. The present invention is characterized in that the angle R1 formed by the first crease line L1 between the first side wall and the crossbar 50 and the second crease line L2 between the crossbar 50 and the bent piece 60 is acute, and the starting point P on the tip side of the second crease line L2 away from the first side wall (end wall 20) is on the extension line of the main crease line L4 between the bottom plate 10 and the second side wall, or inside the extension line, in the state of the blank sheet S1.

Description

[[Technical Field]]

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

[0002] Conventionally, trays are often used for shipping vegetables, fruits and other fresh produce in many cases. In such cases, trays are stacked for use to enable large-volume shipment at one time.

[0003] A corrugated fiberboard tray comprises a bottom plate, front and rear end walls and left and right side walls continuously provided on the bottom plate, wherein a pair of crosspieces covering the edge portion of the upper opening on the end wall side are continuously provided on both end walls, and the side edge portions of the crosspieces are supported by the upper edge portions of the side walls (see, for example, Patent Document 1 or 2). In the trays of Patent Documents 1 and 2, the long side walls are inclined inward, and the lower end portions of the side walls of an upper stacked tray rest on the upper end portions of the side walls of the lower tray, so that the load-bearing capacity is increased. [[Prior Art Literature]] [[Patent Literature]]

[0004] [[Patent Document 1]] Japanese Patent No. 6974643 [[Patent Document 2]] Japanese Patent No. 7382765 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0005] In the above-mentioned conventional tray, the high-strength corner portions are also inclined together with the side walls, so the position of the upper end of the corner portion and the position of the lower end of the corner portion are deviated between the vertically stacked trays, resulting in the problem that the strength of the corner portions cannot be fully utilized.

[0006] An object of the present invention is to solve the above-described problem and provide a tray capable of inclining the side walls inward while forming corner portions at right angles to the bottom plate. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention provides a tray comprising a bottom plate, a first side wall connected to a pair of opposing edges of the bottom plate, and a second side wall connected to another pair of opposing edges of the bottom plate, wherein the tray has a rib connected to the upper end of the first side wall, a bent piece connected to the rib and covering the outer surface of the second side wall, and an insert piece connected to the bent piece, wherein the angle between the first side wall and the rib and the second rib between the rib and the bent piece is acute, and the starting point of the tip of the second rib on the side away from the first side wall is on the extension of the main rib between the bottom plate and the second side wall, or inside the extension.

[0008] According to the tray of the present invention, the angle between the first and second scribed lines is acute, and the starting point on the front end is on the extension of the main scribed line, or inside the extension line. Therefore, the corner between the first and second side walls can be made perpendicular to the bottom plate, while the second side wall can be inclined inward.

[0009] In the tray of the present invention, it is preferable that the tray further comprises an overlapping piece connected to the end of the second side wall and overlapped on the inside of the first side wall, and that the third crease line between the second side wall and the overlapping piece is perpendicular to the main body crease line. With such a configuration, the corner between the first side wall and the second side wall can be reliably made perpendicular to the bottom plate. [Effects of the Invention]

[0010] In the tray of the present invention, the corners can be made perpendicular to the bottom plate while the side walls can be inclined inward. This allows multiple trays to be stacked stably. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of the tray according to the first embodiment of the present invention, viewed from the front upper right. [Figure 2] This figure shows a blank sheet for a tray according to the first embodiment of the present invention. [Figure 3] This diagram illustrates the procedure for assembling the first side wall of a tray according to the first embodiment of the present invention, where (a) is a perspective view showing the state of the first side wall before assembly, (b) is a perspective view showing the state of the first side wall in an upright position, and (c) is a perspective view showing the state of the rib portion of the first side wall in a bent position. [Figure 4] This is a view taken along line IV in Figure 1, showing a corner of a stacked tray according to the first embodiment of the present invention. [Figure 5] Figure 1 is a cross-sectional view along line VV showing the second side wall of a stacked tray according to the first embodiment of the present invention. [Figure 6] This figure shows a blank sheet for a tray according to a second embodiment of the present invention. [Figure 7] This is a perspective view of the tray according to the third embodiment of the present invention, viewed from the front upper right. [Figure 8] This figure shows a blank sheet for a tray according to a third embodiment of the present invention. [Figure 9] This is a perspective view of the tray according to the fourth embodiment of the present invention, viewed from the front upper right. [Figure 10] This figure shows a blank sheet of a tray according to the fourth embodiment of the present invention. [Figure 11] This is a perspective view of the tray according to the fifth embodiment of the present invention, viewed from the front upper right. [Figure 12] This figure shows a blank sheet of a tray according to the fifth embodiment of the present invention. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the descriptions of each embodiment, the same reference numerals will be used for identical components, and redundant explanations will be omitted. In the following description, the front-rear and left-right directions are defined for convenience in describing the tray of the present embodiment, and do not limit the configuration or use state of the tray.

[0013] [First Embodiment] The tray 1A according to the first embodiment of the present invention comprises, as shown in Fig. 1, a bottom plate 10, first side walls (hereinafter referred to as front and rear "end walls 20") continuously provided on a pair of end edges opposite to each other in the front-rear direction of the bottom plate 10, and second side walls (hereinafter referred to as left and right "side walls 30") continuously provided on a pair of end edges opposite to each other in the left-right direction of the bottom plate 10. The tray 1A further comprises front and rear crosspieces 50, 50 continuously provided on the upper edges of both end walls 20, 20 (the first side walls), folded pieces 60 continuously provided on the left and right edges of the crosspieces 50, and insertion pieces 70 continuously provided on the lower ends of the folded pieces 60. Furthermore, the tray 1A is provided with overlapping pieces 80 respectively continuously provided on the front and rear edges of both side walls 30, 30.

[0014] As shown in Fig. 2, the tray 1A is formed by mountain-folding or valley-folding a blank sheet S1, which is obtained by cutting a corrugated cardboard sheet, along each folding line. The blank sheet S1 shown in Fig. 2 is arranged such that the inner surface side is visible. The folding lines of the blank sheet S1 are ruled lines (press rules) formed by linearly pressing the surface of the blank sheet S1. It should be noted that intermittent cuts may be formed in the ruled lines. This makes it easier to fold the blank sheet S1 along the ruled lines. Alternatively, the folding lines may be formed by intermittently forming linear half-cut cuts that cut only the surface of the sheet or cuts that penetrate through the sheet.

[0015] As shown in Fig. 1 and Fig. 2, the bottom plate 10 is formed in a quadrilateral shape. Front and rear end walls 20, 20 (the first side walls) are continuously provided on the front and rear edges of the bottom plate 10, and left and right side walls 30, 30 (the second side walls) are continuously provided on the left and right edges of the bottom plate 10.

[0016] The front end wall 20 is connected to the front edge of the base plate 10 via a folded line and extends upward from the front edge of the base plate 10. The rear end wall 20 is connected to the rear edge of the base plate 10 via a folded line and extends upward from the rear edge of the base 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 base plate 10.

[0017] The front crossbar 50 is connected to the upper edge of the front end wall 20 via a first ruled line L1 (see Figure 2), which is a broken line. The crossbar 50 is the part that covers the end of the opening on the end wall 20 side. The front crossbar 50 is formed in a strip shape along the upper edge of the front end wall 20. The front crossbar 50 is perpendicular to the front end wall 20 and extends backward in a state parallel to the bottom plate 10. The middle part of the leading edge (rear edge) of the front crossbar 50 in the left-right direction is recessed toward the front.

[0018] A left front bent piece 60 is connected to the left edge of the front crossbar 50 via a second crease line L2 (see Figure 2), which is a fold line. The left front bent piece 60 extends downward from the left edge of the crossbar 50. The left front bent piece 60 overlaps the outer surface of the left side wall 30.

[0019] The angle R1 formed by the first scribe line L1 between the front end wall 20 (first side wall) and the front crossbar 50, and the second scribe line L2 between the front crossbar 50 and the left front bent piece 60, is acute (approximately 85° (specifically 85.7°)). The starting point P (see Figure 2) on the side away from the end wall 20 (first side wall) of the second ruled line L2 is located inside the extension of the main ruled line L4 (see Figure 2) between the bottom plate 10 and the left side wall 30 (second side wall) when the blank sheet S1 is in place (inside the bottom plate 10).

[0020] The left front bent piece 60 has a left insert piece 70 connected to its lower end via a fold line. The insert piece 70 is inserted into the engagement slit 31, which will be described later. The fold line between the bent piece 60 and the insert piece 70 is formed parallel to the second scribe line L2. A notch 71 is formed at the base end of the insert piece 70. The notch 71 is hook-shaped, and when the insert piece 70 is inserted into the engagement slit 31, the notch 71 catches on the longitudinal end of the slit and engages.

[0021] A right front bent piece 60 is attached to the right edge of the front crossbar 50 via a second scribe line L2 (fold line). The right front bent piece 60 is formed symmetrically with the left front bent piece 60.

[0022] The second front right grid line L2 is formed symmetrically with the second front left grid line L2, and the angle R1 formed by the first front grid line L1 and the second front right grid line L2 is acute (approximately 85° (specifically 85.7°)). Furthermore, the starting point P on the front end side of the second ruled line L2 on the right side, away from the end wall 20 (first side wall), is located inside the extension of the main ruled line L4 between the bottom plate 10 and the right side wall 30 (second side wall) when the blank sheet S1 is in place (inside the bottom plate 10).

[0023] The lower end of the right front bent piece 60 is connected to the right-side insert piece 70 via a fold line. The right front insert piece 70 is formed symmetrically with the left front insert piece 70 and has a notch 71. The insert piece 70 is inserted into the engagement slit 31, which will be described later.

[0024] The rear crossbar 50 is connected to the upper edge of the rear end wall 20 via a first ruled line L1, which is a broken line. The rear crossbar 50 is formed symmetrically to the front crossbar 50. The left and right edges of the rear crossbar 50 are connected to left and right bent pieces 60, 60. The two rear bent pieces 60, 60 are formed symmetrically to the two front bent pieces 60, 60.

[0025] The second grid lines L2, L2 on the rear left and right are formed symmetrically to the second grid lines L2, L2 on the front left and right, and the angle R1 formed by the first grid line L1 on the rear and the second grid lines L2, L2 on the rear left and right is acute (approximately 85° (specifically 85.7°)). Furthermore, the starting points P, P on the front end side of the second scribed lines L2, L2 on both the left and right rear sides, which are away from the end walls 20 (first side walls), are located inside the extension of the main scribed lines L4, L4 between the bottom plate 10 and the side wall 30 (second side wall) in the state of the blank sheet S1 (inside the bottom plate 10).

[0026] The lower ends of the rear left and right bent pieces 60, 60 are connected via a fold line to the left and right insert pieces 70, 70. The rear insert pieces 70, 70 are formed symmetrically to the front insert pieces 70, 70 and are inserted into the engagement slits 31 described later.

[0027] The left side wall 30 is connected to the left edge of the base plate 10 via a folded line (main body grid line L4) and extends upward from the left edge of the base plate 10. The left side wall 30 is formed in a roughly rectangular shape. A superimposed piece 80, which forms the left front inner flap, is attached to the front edge of the left side wall 30. The left front superimposed piece 80 extends to the right from the front edge of the left side wall 30 and is formed in a roughly rectangular shape. The superimposed piece 80 is formed perpendicular to the side wall 30 and overlaps the inside of the front end wall 20 (first side wall).

[0028] The third grid line L3 (see Figure 2) between the left side wall 30 (second side wall) and the left front overlapping piece 80 is perpendicular to the main grid line L4 between the bottom plate 10 and the left side wall 30. A superimposed piece 80, which forms the left rear inner flap, is attached to the rear edge of the left side wall 30. The left rear superimposed piece 80 is formed symmetrically to the left front superimposed piece 80. The superimposed piece 80 is formed perpendicular to the side wall 30 and overlaps the inside of the rear end wall 20 (first side wall).

[0029] The angle R2 formed by the third scribe line L3 between the left side wall 30 (second side wall) and the left rear overlapping piece 80, and the main scribe line L4 between the bottom plate 10 and the left side wall 30, is a right angle.

[0030] Engaging slits 31 into which the insertion piece 70 is inserted are formed at the front and rear ends of the left side wall 30. The engaging slits 31 are elongated slits along the lower edge of the side wall 30. The lower edge of the engaging slits 31 is formed to follow the main body grid line 4.

[0031] The right side wall 30 is connected to the right edge of the base plate 10 via a folded line (main body grid line L4) and extends upward from the right edge of the base plate 10. The right side wall 30 is formed symmetrically with the left side wall 30.

[0032] A superimposed piece 80, which forms the right front inner flap, is attached to the front edge of the right side wall 30. The right front superimposed piece 80 is formed symmetrically with the left front superimposed piece 80. The angle R2 formed by the third scribe line L3 between the right side wall 30 (second side wall) and the right front overlapping piece 80, and the main scribe line L4 between the bottom plate 10 and the right side wall 30, is a right angle.

[0033] A superimposed piece 80, which forms the inner flap at the right rear, is attached to the rear edge of the right side wall 30. The right rear superimposed piece 80 is formed symmetrically to the right front superimposed piece 80 and overlaps the inside of the rear end wall 20 (first side wall). The superimposed piece 80 is formed perpendicular to the side wall 30. The third grid line L3 between the right side wall 30 (second side wall) and the right rear overlapping piece 80 is perpendicular to the main grid line L4 between the bottom plate 10 and the right side wall 30.

[0034] Next, the assembly procedure for tray 1A with the above configuration will be explained with reference to Figure 3. When assembling tray 1A, first, as shown in Figure 3(a), the main crease line L4 is bent to raise the side wall 30 relative to the bottom plate 10, and the third crease line L3 is bent to make the overlapping piece 80 perpendicular to the side wall 30. At this time, since the third crease line L3 between the side wall 30 and the overlapping piece 80 is perpendicular to the main crease line L4, the side wall 30 including the corner C rises at a 90° angle to the bottom plate 10.

[0035] Next, as shown in Figure 3(b), the end wall 20 is raised relative to the base plate 10. Then, as shown in Figure 3(c), the first scribe line L1 is bent to make the crossbar 40 horizontal. At this time, the angle R1 formed by the first scribe line L1 between the end wall 20 and the crossbar 50 and the second scribe line L2 between the crossbar 50 and the bent piece 60 is acute, and the starting point P on the tip side of the second scribe line L2 is inside (towards the base plate 10) of the extension line of the main scribe line L4, so the second scribe line L2 extends inward from the top of the corner C on the upper part of the side wall 30.

[0036] Finally, as shown in Figure 1, the second score line L2 is folded so that the folded piece 60 overlaps the outer surface of the side wall 30, and the insertion piece 70 is inserted into the engagement slit 31.

[0037] At this time, at corner C, the second scribe line L2 is located at the end of the side wall 30, so the end of the side wall 30 is perpendicular (vertical) to the bottom plate 10. Furthermore, the third scribe line L3 between the side wall 30 and the overlapping piece 80 is perpendicular to the main scribe line L4, and the overlapping piece 80 is perpendicular to the side wall 30, so corner C is reliably perpendicular to the bottom plate 10. As a result, when trays 1A are stacked vertically, the corner C of the upper tray 1A rests directly on the corner C of the lower tray 1A, so that the corners C of each tray 1A become straight and can support the load of the upper tray 1A (see Figure 4). Therefore, the corners C of the upper and lower trays 1A are less likely to shift and the corners C are less likely to deform, so the strength of the largest corner C can be effectively utilized.

[0038] On the other hand, at positions away from the end wall 20, as shown in Figure 5, the side wall 30 is pushed inward by the bent piece 60 and tilts inward. Specifically, the bent piece 60 is bent along the second crease line L2, but the second crease line L2 extends inward as it moves away from the end wall 20, so the inward tilt of the side wall 30 increases progressively as it moves away from the corner C. Also, the base end side (upper side) of the bent piece 60 curves inward, and the base end side (lower side) is close to the main crease line 4, so the side wall 30 tilts inward as it goes upward. In other words, the side wall 30 rises at an acute angle with respect to the bottom plate 10. As a result, the side wall 30 of the lower tray 1A is located below the bottom plate 10 of the upper tray 1A, and can support the load of the upper tray 1A along its entire length.

[0039] As described above, with the tray 1A of this embodiment, the four corners C of the tray 1A can be made perpendicular to the bottom plate 10, while the portion of the side wall 30 away from the corners C can be inclined inward. As a result, the load of the upper tray 1A can be supported not only by the side wall 30 but also by the strong corners C, thereby increasing the load-bearing capacity of the tray 1A and allowing multiple trays 1A to be stacked stably.

[0040] [Second Embodiment] Next, the tray of the second embodiment will be described with reference to Figure 6. As shown in Figure 6, the tray of the second embodiment is formed by folding a blank sheet S2, cut from a corrugated cardboard sheet, along each fold line (mountain fold or valley fold). The blank sheet S2 shown in Figure 6 is arranged so that its inner surface is visible.

[0041] The tray of the second embodiment differs from the tray 1A of the first embodiment in that a projection 33 is formed at the upper end of the side wall 30, and an insertion hole 13 is formed in the bottom plate 10 into which the projection 33 of the lower tray is inserted. The projection 33 and the insertion hole 13 are parts that prevent the trays stacked vertically from shifting. The projection 33 is formed in two places on the side wall 30 and protrudes upward from the upper end of the side wall 30. The two projections 33 are formed at a predetermined distance apart on the inner part of the side wall 30 that is inclined inward by the bent piece 63.

[0042] The insertion hole 13 is a horizontally elongated slit into which the projection 33 can be inserted, and is formed on the periphery of the bottom plate 10. The insertion hole 13 is formed to widen inward from the main body crease line L4 with a width dimension equivalent to the thickness dimension of the corrugated cardboard.

[0043] Furthermore, the tray of the second embodiment differs in the shape of the overlapping piece 83 and the bent piece 63 from the overlapping piece 80 and the bent piece 60 of the first embodiment. The overlapping piece 83 has an upper edge that is longer than the lower edge, and its leading edge is inclined. The longer upper edge of the overlapping piece 83 increases the length over which it supports the crossbar 50, thereby increasing the support force of the crossbar 50.

[0044] The folded piece 63 has a reduced width due to the lengthening of the upper edge of the overlapping piece 83. Specifically, the tip portion of the folded piece 63 that faces the edge of the overlapping piece 83 within the blank sheet S2 is narrower due to the increased size of the overlapping piece 83. As a result, the side of the folded piece 63 on the end wall 20 side is inclined, and the width of the tip portion of the folded piece 63 is equivalent to the width of the insert piece 70. The other components are the same as those of tray 1A in the first embodiment, so the same reference numerals are used and their descriptions are omitted.

[0045] The tray of the second embodiment provides the same effects as the tray 1A of the first embodiment. In addition, when stacking trays vertically, the projection 33 of the lower tray is inserted into the insertion hole 13 of the upper tray, thereby connecting the upper and lower trays and preventing them from shifting.

[0046] [Third Embodiment] Next, the tray 1C of the third embodiment will be described with reference to Figures 7 and 8. As shown in Figure 8, the tray of the third embodiment is formed by folding a blank sheet S3, cut from a corrugated cardboard sheet, along each fold line (mountain fold or valley fold). The blank sheet S3 shown in Figure 8 is arranged so that its inner surface is visible. The tray of the third embodiment differs in shape from that of the first embodiment in that the crossbar is composed of left and right top plates 55, 55, and an inner wall 57 is provided inside the end wall 20, as shown in Figures 7 and 8. Also, the bent piece 63 and overlapping piece 83 of the third embodiment have the same shape as those of the second embodiment.

[0047] The top plate 55 is a fan-shaped portion that covers the four corners of the upper opening of the tray 1C. The top plate 55 is connected to the left and right ends of the upper end of the end wall 20 via a first grid line L1, which is a broken line. The first grid line L1 forms one of the straight sections of the fan shape of the top plate 55.

[0048] The left edge of the left top plate 55 is connected to the left bent piece 63 via a second crease line L2, which is a fold line. The second crease line L2 forms the other straight section of the fan shape of the top plate 55. The left bent piece 63 extends downward from the left edge of the top plate 55 and overlaps the outer surface of the left side wall 30. The right top plate 55 is formed symmetrically with the left top plate 55. The right folded piece 63 is connected to the right edge of the right top plate 55 via a second crease line L2, which is a fold line. The right folded piece 63 extends downward from the right edge of the top plate 55 and overlaps the outer surface of the right side wall 30.

[0049] The angle R1 formed by the first scribe line L1 between the end wall 20 (first side wall) and the left and right top plates 55, and the second scribe line L2 between the top plate 55 and the left front bent piece 63, is acute (approximately 85° (specifically 85.7°)). The starting point P on the tip side of the second ruled line L2, away from the end wall 20 (first side wall), is, in the state of the blank sheet S3, on the extension of the main ruled line L4 between the bottom plate 10 and the side wall 30 (second side wall), or inside the extension (towards the bottom plate 10).

[0050] At the upper edge of the end wall 20, an intermediate plate 56 is connected between the left and right top plates 55, 55 via a first grid line L1. The intermediate plate 56 is the portion that overlaps the upper edges of the left and right overlapping pieces 83, 83 connected to the side wall 30. An inner wall 57 is connected to the leading edge (inner edge) of the intermediate plate 56 via a fold line. As shown in Figure 7, the inner wall 57 is the part that overlaps with the inner surface of the overlapping piece 83.

[0051] Mounting pieces 58 are provided protruding from the lower edge of the inner wall 57. Two mounting pieces 58 are provided, spaced apart in the left-right direction. The lower edge of the inner wall 57 is held in place by the mounting pieces 58 being inserted into mounting holes 15 formed in the base plate 10. The front and rear top plates 55, the intermediate plate 56, and the inner wall 57 are formed symmetrically to each other.

[0052] The tray of the third embodiment provides the same effects as the tray 1A of the first embodiment, and by overlapping the inner wall 57 with the inner surface of the overlapping piece 83, the end wall 20, intermediate plate 56, and inner wall 57 surround the overlapping piece 83. This increases the support strength of the end wall 20.

[0053] [Fourth Embodiment] Next, the tray 1D of the fourth embodiment will be described with reference to Figures 9 and 10. The tray 1D of the fourth embodiment is formed by folding a blank sheet S4, cut from a corrugated cardboard sheet as shown in Figure 10, along each fold line (mountain fold or valley fold). The blank sheet S4 shown in Figure 10 is arranged so that its inner surface is visible.

[0054] The tray 1D of the fourth embodiment differs from the tray 1A of the first embodiment in that, as shown in Figures 9 and 10, a projection 21 is formed at the upper end of the end wall 20, and an insertion hole 16 is formed in the bottom plate 10 into which a projection (not shown) of the lower tray is inserted. Also, the shape of the overlapping piece 83 and the bent piece 63 is the same as in the second embodiment, and differs from the first embodiment. The projection 21 and the insertion hole 16 are parts that prevent the trays stacked vertically from shifting. The projection 21 protrudes upward from the upper end of the end wall 20. The projection 21 is formed at two locations on the upper edge of the end wall 20. The projection 21 is arranged symmetrically on the left and right sides with a gap between them in the left-right direction (the direction in which the end wall 20 extends).

[0055] Specifically, the projection 21 is formed at the tip of the upper edge of the overlapping piece 83, which is connected to the front and rear edges of the side wall 30, respectively. Similar to the second embodiment, the overlapping piece 83 has an upper edge that is longer than the lower edge, and its tip edge is inclined. The projection 21 has a trapezoidal shape, narrowing in width from the base end to the tip end. When the tray 1D is assembled, the projection 21 protrudes upward through the through hole 51 formed in the crossbar 50. The through hole 51 widens from the base end of the crossbar 50 toward the tip end in the overhanging direction. The through hole 51 has a rectangular shape through which the projection 21 can pass. The projection 21 is formed flush with the overlapping piece 83, and the outer surface of the projection 21 is positioned to overlap the inner surface of the end wall 20.

[0056] The folded piece 63 has a smaller width at its tip due to the lengthening of the upper edge of the overlapping piece 83. In the blank sheet S4 state, the edge of the folded piece 63 facing the edge of the overlapping piece 83 is inclined to be parallel to the tip edge of the overlapping piece 83. An insert piece 70 is formed at the tip of the folded piece 63. Insert pieces 70 are formed on both the left and right folded pieces 63, and the right insert piece 70 is symmetrical to the left insert piece 70. Notches 71 are formed at both the front and rear ends of the base end of the insert piece 70. The insert piece 70 is inserted into an engagement slit 31 formed at the base end of the side wall 30. The stepped portion formed by the notches 71 of the insert piece 70 protrudes outward from the engagement slit 31 and is locked to the side edge of the engagement slit 31.

[0057] The insertion hole 16 is a hole into which a projection of the lower tray (not shown) is inserted, and is formed in the bottom plate 10. The insertion hole 16 is provided at a position corresponding to the projection 21. In this embodiment, the insertion hole 16 is formed at a position that intersects with the boundary (grid line) between the bottom plate 10 and the end wall 20. That is, the insertion hole 16 is formed extending from the bottom plate 10 to the end wall 20. The height dimension of the portion of the insertion hole 16 formed in the end wall 20 is smaller than the height dimension of the projection 21. As a result, the tip (upper end) of the projection 21 is inserted into the inside of the end wall 20 above the insertion hole 16 and locked in place. The outer surface of the projection 21 is in contact with the inner surface of the end wall 20. The other components are the same as those of tray 1A in the first embodiment, so the same reference numerals are used and their descriptions are omitted.

[0058] According to the tray 1D of the fourth embodiment, in addition to obtaining the same effects as the tray 1A of the first embodiment, the projection 21 of the lower tray is inserted into the insertion hole 16 of the upper tray, thereby connecting the upper and lower trays and preventing the stacked trays from shifting.

[0059] [Fifth Embodiment] Next, the tray 1E of the fifth embodiment will be described with reference to Figures 11 and 12. The tray 1E of the fifth embodiment is formed by folding a blank sheet S5, cut from a corrugated cardboard sheet as shown in Figure 12, along each fold line, either as a mountain fold or a valley fold. The blank sheet S5 shown in Figure 12 is arranged so that its inner surface is visible.

[0060] As shown in Figures 11 and 12, the tray 1E of the fifth embodiment differs from the fourth embodiment in the configuration and number of projections 22 provided on the upper end of the end wall 20, and in the position and number of insertion holes 17 provided in the bottom plate 10. Also, the shape of the overlapping piece 83 differs from that of the fourth embodiment. The projections 22 and insertion holes 17 are parts that prevent trays stacked vertically from shifting. The projections 22 protrude upward from the upper end of the end wall 20. The projections 22 are formed at one location on the upper edge of the end wall 20 and are located in the middle in the left-right direction (the direction in which the end wall 20 extends).

[0061] Specifically, the projection 22 is formed by combining a first projection 23 formed at the tip of the upper edge of the overlapping piece 83 and a second projection 24 formed at the upper edge of the end wall 20. Similar to the second embodiment, the overlapping piece 83 has an upper edge that is longer than the lower edge, and its tip edge is inclined. In the fifth embodiment, a notch 84 is formed at the tip edge of the overlapping piece 83. The notch 84 is formed on the lower side of the tip edge, and the tip edge on the lower side is approximately perpendicular to the lower edge.

[0062] The first protrusions 23 are provided on the left and right overlapping pieces 83, and each protrudes upward from the tip of the upper edge. The tips of the left and right first protrusions 23, 23 are in contact with each other. The width dimension of the first protrusions 23 is approximately half the width dimension of the projection 22, and the left and right first protrusions 23, 23 combined make up the width dimension of the projection 22.

[0063] The second projection 24 protrudes upward from the upper edge of the end wall 20. In the blank sheet S5 state, the second projection 24 extends toward the through hole 52 formed in the crossbar 50 (the shape of the through hole 52 will be described later). The second projection 24 has a width dimension equivalent to the width dimension of the projection 22 and a height dimension equivalent to the height dimension of the first projection 23. In side view, the second projection 24 has a rectangular shape, and the upper corner is chamfered in an arc shape. The second projection 24 is flush with the end wall 20. In the assembled tray 1E state, the outer surfaces of the pair of left and right first projections 23, 23 overlap on the inner surface of the second projection 24 to form a projection 22. The projection 22 protrudes upward through the through hole 52 formed in the crossbar 50. The through hole 52 widens from the base end of the crossbar 50 toward the tip in the direction of projection. The through-hole 52 has a depth dimension greater than the combined thickness dimension of the first projection 23 and the second projection 24, and a width dimension greater than the width dimension of the projection 22. As a result, the through-hole 52 has a rectangular shape through which the projection 22 can pass.

[0064] The insertion hole 17 is a hole into which a projection (not shown) of the lower tray is inserted, and is formed in the bottom plate 10. The insertion hole 17 is located in the middle of the left-right longitudinal direction, corresponding to the projection 22. In this embodiment, the insertion hole 17 is formed at a position that intersects with the boundary (grid line) between the bottom plate 10 and the end wall 20. That is, the insertion hole 17 is formed extending from the bottom plate 10 to the end wall 20. The height dimension of the portion of the insertion hole 17 formed on the end wall 20 is smaller than the height dimension of the projection 22. As a result, the tip (upper end) of the projection 22 is inserted into the inside of the end wall 20 above the insertion hole 16, and is locked in place. The projection 22 is bent inward, and the outer surface of the projection 22 (the outer surface of the second projection 24) is in contact with the inner surface of the end wall 20. The other components are the same as those of tray 1A in the first embodiment, so the same reference numerals are used and their descriptions are omitted.

[0065] The end wall 20 has a handle hole 18 for lifting the tray 1E. The handle hole 18 is formed in the middle of the end wall 20 in the left-right direction and in the middle of the height direction. The handle hole 18 is elongated horizontally. At least the upper surface of the handle hole 18 is formed in a wavy shape, making it easy to insert fingers and grip.

[0066] According to the fifth embodiment of tray 1E, in addition to obtaining the same effects as tray 1A of the first embodiment, the projection 22 of the lower tray is inserted into the insertion hole 17 of the upper tray, thereby connecting the upper and lower trays and preventing the stacked trays from shifting. The projection 22 has the thickness of two sheets of cardboard, so it has great strength.

[0067] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. In the above embodiment, the starting point P on the leading edge of the second crease line L2 is configured to be inside the extension of the main crease line L4 between the bottom plate 10 and the side wall 30, but it may also be positioned on the extension of the main crease line L4. Even if the starting point P on the leading edge of the second crease line L2 is on the extension of the main crease line L4, the folded piece 60 will push the side wall 30 inward by the thickness of the cardboard, so the side wall 30 can be tilted inward.

[0068] Although the tray 1A in the above embodiment is made of corrugated cardboard, the tray may be formed from various known types of cardboard. [Explanation of Symbols]

[0069] 1A Tray (First Embodiment) 1C Tray (Third Embodiment) 1D Tray (Fourth Embodiment) 1E Tray (Fifth Embodiment) 10 Bottom plate 20 End wall (first side wall) 30 Side wall (second side wall) 50 Cross section 55 Top plate (piece) 60 bent piece 63 Bent piece 70 Insertion piece 80 Polymer piece 83 Polymer piece L1 First grid line L2 Second gridline L3 Third gridline L4 Main grid lines P Starting point on the tip side R1 The angle formed by the first and second grid lines. S1 Blank sheet (first embodiment) S2 Blank Sheet (Second Embodiment) S3 Blank Sheet (Third Embodiment) S4 Blank Sheet (Fourth Embodiment) S5 Blank Sheet (Fifth Embodiment)

Claims

1. The base plate and A first side wall is provided on a pair of opposing edges of the bottom plate, A tray comprising a second side wall connected to another pair of opposing edges of the bottom plate, A crossbar is provided at the upper end of the first side wall, A bent piece connected to the aforementioned crossbar and placed over the outer surface of the second side wall, It has an insert piece connected to the aforementioned bent piece, The angle formed by the first scribe line between the first side wall and the crossbar and the second scribe line between the crossbar and the bent piece is acute. The starting point of the second ruled line on the side away from the first side wall is, in the blank sheet state, on the extension of the main ruled line between the bottom plate and the second side wall, or inside the extension of the extension line. A tray characterized by the following features.

2. The present invention further comprises overlapping pieces connected to the end of the second side wall and superimposed on the inside of the first side wall, The third scribe line between the second side wall and the overlapping piece is perpendicular to the main body scribe line. The tray according to feature 1.

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