Locking type tray

Abstract

To provide a locking type tray which can be easily assembled and can reliably maintain its shape.SOLUTION: A locking tray T1 comprises a blank where a side wall 2 and an end wall 3 are connected to the periphery of a bottom wall 1 with a corner part in therebetween, a notch 4 is made in the side wall 2, and a connecting piece 5 connected to a side ridge of the end wall 3, and allows a locking part 5b of the connecting piece 5 to be inserted into the notch 4 to maintain the shape. Slant folding lines 6a and 6b are formed near the corner part of the side wall 2. When a side abutment part 2b of the side wall 2 is folded inward along the slant folding lines 6a and 6b, a vertical cut 4a and a horizontal cut 4b of the notch 4 open at a receiving part 4b1 to form a gap. When the locking part 5b is inserted into the gap from the outer surface side to the inner surface side of the side wall 2 while pushing and widening a retaining part 4b2 of the horizontal cut 4b, as the side wall 2 rebounds and returns to its original shape, the retaining part 4b2 of the horizontal cut 4b closes, an upper edge of the locking part 5b engages with an end edge facing the horizontal cut 4b, and the side wall 2 and end wall 3 are fixed in an upright state from the bottom wall 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a locking tray that can be assembled without gluing or the like. [Background technology]

[0002] As this kind of easily assembled locking tray, the following Patent Document 1 describes one as shown in FIG.

[0003] This locking tray is made of a blank having a bottom wall 51, side walls 52 and end walls 53 connected to each other at the corners, with a notch 54 made in the side wall 52 and a connecting piece 55 connected to the end wall 53, and the side wall 52 and end wall 53 are raised from the bottom wall 51, and a locking portion 55b extending from a base 55a of the connecting piece 55 is inserted into the notch 54 to maintain the shape. Various locking trays similar to this have also been proposed in the past (see Patent Documents 2 and 3 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3194439 [Patent Document 2] Japanese Patent Application Publication No. 09-058663 [Patent Document 3] JP 2009-051561 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional locking trays had problems such as the difficulty of inserting the connecting pieces into the notches, making assembly time-consuming, and the possibility that the connecting pieces could suddenly come out of the notches during assembly, causing the tray to lose its shape.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a locking tray that can be easily assembled and whose shape is reliably maintained. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a locking tray that is made of a blank having a bottom wall with side walls and end walls connected to each other at corners, with notches cut into the side walls and connecting pieces connected to the end walls, and that has its shape maintained by raising the side walls and end walls from the bottom wall and inserting locking portions extending from bases of the connecting pieces into the notches, The cut in the side wall includes a vertical cut extending upward from the bottom wall side and a horizontal cut extending from the upper end of the vertical cut in a direction away from the corner portion, and the inside and outside of the cut in the side wall are defined as a side receiving portion and a side abutment portion, respectively; The side abutment portion has an oblique fold line extending from the horizontal cut toward the upper end so as to move away from the corner portion, and the portion on the vertical cut side and the opposite side of the intersection of the horizontal cut with the oblique fold line are respectively an insertion portion and a removal prevention portion, When the side support portion is folded inward along the diagonal fold line, the receiving portions of the vertical and horizontal cuts open to create a gap, and when the locking portion is inserted into this gap from the outer side of the side wall to the inner side while pushing apart the anti-slip portion of the horizontal cut, the anti-slip portion of the horizontal cut closes as the side wall rebounds to its original shape, and the upper edge of the locking portion engages with the edge facing the horizontal cut, so that the side wall and end wall are fixed in an upright position from the bottom wall.

[0008] In addition, the vertical cuts of the cuts are inclined toward the corner portion starting from the bottom wall side, and the horizontal cuts of the cuts are inclined upward from the connection side with the vertical cuts.

[0009] Furthermore, when the engaging portion of the connecting piece is inserted into the notch of the side wall, the upper edge is inclined in accordance with the inclination of the lateral cut of the notch.

[0010] In addition, each pair of side walls and end walls connected to the periphery of the bottom wall are each an inverted trapezoid with an upper side longer than a lower side, In the assembled state, the container has a tapered shape in which the area of ​​the opening on the top surface is larger than the area of ​​the bottom wall that forms the bottom surface.

[0011] In such a locking tray, in addition to the diagonal fold line above the horizontal cut, the side support portion has a diagonal fold line extending diagonally upward from the bottom wall side toward the vertical cut.

[0012] In addition, the blank is made of cardboard, with the corrugation direction oriented along the boundary between the bottom wall and the end wall, thereby making the corrugation direction of the connecting piece extend from the base to the engaging portion.

[0013] Alternatively, the side support portion does not have a diagonal fold line extending diagonally upward from the bottom wall side toward the vertical cut, and a reverse fold line extending from the horizontal cut to the upper end is inserted between the diagonal fold line above the horizontal cut and the corner portion.

[0014] Further, an opening is formed in the side abutment portion so as to enlarge the longitudinal cut.

[0015] Furthermore, the blank is made of cardboard, with the corrugation direction oriented along the boundary between the bottom wall and the side wall, thereby making the corrugation direction of the side support portion extend laterally from the corner portion side. Effect of the Invention

[0016] In the locking tray of this invention, when assembling, the side abutment portions of the side walls are folded along the diagonal fold lines, causing the receiving portions of the vertical and horizontal cuts of the notches to open up and create a gap, into which the engaging portion of the connecting piece can be easily inserted.

[0017] Then, as the insertion of the locking portion into the notch progresses and the locking portion passes through the horizontal notch of the notch, the side wall returns to its original shape, the anti-slip portion of the horizontal notch of the notch closes, and the locking portion is prevented from slipping out of the notch with the locking portion aligned along the inner surface of the side receiving portion of the side wall.

[0018] This allows the assembly work from the blank to be performed simply and efficiently, and the notches and connecting pieces are firmly interlocked with each other, so that the side walls and end walls are connected and securely fixed in an upright state from the bottom wall, allowing the stored items to be carried in a stable shape. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing an assembled state of a locking tray according to a first embodiment of the present invention; [Diagram 2] FIG. 1 shows the blank of the same [Diagram 3] FIG. 11 is an enlarged perspective view of the outer surface near a corner portion in the initial assembly process of the above embodiment; [Figure 4] FIG. 13 is an enlarged perspective view of the outer surface near a corner portion during an intermediate assembly process of the above embodiment; [Diagram 5] FIG. 13 is an enlarged perspective view of the outer surface of the vicinity of a corner portion in the assembled state of the above embodiment; [Figure 6] FIG. 13 is an enlarged perspective view of the inner surface near the corner portion in the assembled state of the above; [Figure 7] FIG. 13 is a perspective view showing a stacked state of the locking trays of the above embodiment; [Figure 8] FIG. 11 is a perspective view showing an assembled state of a locking tray according to a second embodiment of the present invention; [Figure 9] FIG. 1 shows the blank of the same [Figure 10] FIG. 11 is an enlarged perspective view of the outer surface near a corner portion in the initial assembly process of the above embodiment; [Figure 11] FIG. 13 is an enlarged perspective view of the outer surface near a corner portion during an intermediate assembly process of the above embodiment; [Figure 12] FIG. 13 is an enlarged perspective view of the outer surface of the vicinity of a corner portion in the assembled state of the above embodiment; [Figure 13] FIG. 13 is an enlarged perspective view of the inner surface near the corner portion in the assembled state of the above; [Figure 14]FIG. 1 is a perspective view showing an assembled state of the locking tray described in Patent Document 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First, a first embodiment of the present invention will be described with reference to FIGS.

[0021] The locking tray T1 shown in Figure 1 is assembled from a cardboard blank shown in Figure 2. Figures 3 to 6 show enlarged views of the main structural parts of the lock during and after assembly.

[0022] In each drawing, the corrugation direction, which is the direction in which the corrugated crests of the corrugated cardboard core extend, is shown by multiple parallel straight lines within the cutout portion of the surface. Also, in Figure 2, an arrow indicating the corrugation direction is shown outside the cutout circle of the surface. Corrugated cardboard has the property that its strength is high in the corrugation direction and low in the direction crossing this.

[0023] <blank> As shown in Figure 2, the blank for this locking tray T1 has a rectangular bottom wall 1 around which a pair of lengthwise side walls 2 and widthwise end walls 3 are connected at either side of the corners, with notches 4 made in the side walls 2 and connecting pieces 5 connected to the sides of the end walls 3. The side walls 2 and end walls 3 are in the form of an upwardly expanding inverted trapezoid whose upper side is longer than the lower side when assembled.

[0024] The cut 4 is L-shaped with a vertical cut 4a extending from the bottom wall 1 side to the tip side of the side wall 2 and a horizontal cut 4b extending from the vertical cut 4a in a direction away from the corner portion, and the inside and outside of the cut 4 of the side wall 2 are the side receiving portion 2a and the side abutment portion 2b, respectively. A certain amount of space is provided between the vertical cut 4a and the side end of the side wall 2.

[0025] The vertical cut 4a of the cut 4 is inclined toward the corner portion starting from the bottom wall 1 side, and the horizontal cut 4b is inclined in an upward direction from the connection side with the vertical cut 4a.

[0026] In the side abutment portion 2b of the side wall 2, there is a diagonal fold line 6a that runs from the horizontal cut 4b of the cut 4 to the upper edge so as to move away from the corner portion, and a diagonal fold line 6b that runs from the bottom wall 1 side to the vertical cut 4a of the cut 4 so as to move away from the corner portion. The diagonal fold lines 6a and 6b are on the same imaginary straight line and are formed as pressed creases on the cardboard from the back side.

[0027] The portion of the slit 4 on the vertical slit 4a side and the portion on the opposite side from the intersection of the horizontal slit 4b with the diagonal fold line 6a are respectively made into a receiving portion 4b1 and a retaining portion 4b2. In addition, to make it easier to open the slit 4 during assembly and to prevent the cardboard from tearing at the retaining portion 4b2, a curved slit 4c is provided downward from the end of the retaining portion 4b2.

[0028] The connecting piece 5 has a tongue-shaped locking portion 5b extending from a base portion 5a having an arcuate edge that is connected to the end wall 3. The locking portion 5b is shaped so that when it is inserted into the notch 4 of the side wall 2 during assembly, its upper edge is inclined in accordance with the inclination of the horizontal cut 4b of the notch 4.

[0029] Since the step direction of such a blank is oriented along the boundary between the bottom wall 1 and the end wall 3, the step direction of the connecting piece 5 extends from the base 5a to the locking portion 5b, and when the locking portion 5b is inserted into the notch 4 of the side wall 2 during assembly, the locking portion 5b is less likely to bend.

[0030] In addition, in this blank, the portion facing the notch 4 of the side receiving portion 2a and the portion facing the side wall 2 of the connecting piece 5 are subjected to a corrugated crushing process that crushes the cardboard in the thickness direction, so that the connecting piece 5 can be smoothly inserted into the notch 4 during assembly (see the shaded area in Figure 2).

[0031] <Assembly> To assemble the blank, as shown in Fig. 3, the side walls 2 and end walls 3 are raised in sequence from the bottom wall 1, the connecting pieces 5 are folded inward from the end walls 3, and the side abutment portions 2b of the side walls 2 are folded inward along the oblique fold lines 6a, 6b. This opens the receiving portions 4b1 of the vertical cuts 4a and the horizontal cuts 4b of the notches 4, creating a gap between the side receiving portions 2a and the side abutment portions 2b.

[0032] 4, the end wall 3 is further swung in the upright direction, and the connecting piece 5 is aligned along the outer surface of the side abutment portion 2b, and the locking portion 5b of the connecting piece 5 is inserted into the inner surface of the side wall 2 through the gap between the side receiving portion 2a and the side abutment portion 2b. At this time, the locking portion 5b is inserted into the notch 4 while pushing apart the retaining portion 4b2 of the horizontal cut 4b.

[0033] Thereafter, as shown in Figures 5 and 6, as the end wall 3 further swings in the upright direction, the engagement portion 5b of the connecting piece 5 is inserted into the notch 4, and when the engagement portion 5b passes the horizontal notch 4b, the side wall 2 returns to its original position, the engagement portion 4b2 of the horizontal notch 4b closes, a "click" sound is heard, and the upper edge of the engagement portion 5b engages with the edge of the side abutment portion 2b facing the horizontal notch 4b, and the side wall 2 and end wall 3 are fixed in an upright position from the bottom wall 1.

[0034] <Effect of lock structure> In the above-described locking tray T1, when the side abutment portion 2b of the side wall 2 is folded along the oblique fold lines 6a, 6b during assembly, the receiving portion 4b1 of the vertical cut 4a and the horizontal cut 4b of the slit 4 opens to form a gap into which the locking portion 5b of the connecting piece 5 can be easily inserted. This allows the assembly work from a blank to be performed simply and efficiently.

[0035] In the assembled state, with the tip side of the engagement portion 5b of the connecting piece 5 inserted inside the side receiving portion 2a of the side wall 2, the anti-slip portion 4b2 of the horizontal cut 4b of the cut 4 closes, so that the connecting piece 5 will not come out of the cut 4 unless the connecting piece 5 is torn or forcibly bent.

[0036] In addition, the upper edge of the locking portion 5b inserted into the notch 4 is inclined upward from the base 5a side to the tip side in response to the inclination of the horizontal notch 4b, so that the edge facing the horizontal notch 4b engages with the upper edge of the locking portion 5b over a long distance rather than at a single point.

[0037] In this way, the notches 4 of the side walls 2 and the connecting pieces 5 of the end walls 3 are firmly interlocked, and the side walls 2 and the end walls 3 are securely fixed in an upright state from the bottom wall 1. Therefore, even when a heavy item is stored and lifted, the connecting pieces 5 will not unexpectedly come out of the notches 4 due to bending, and the stored item can be carried in a stable shape.

[0038] <Other> As shown in FIG. 1, when assembled, the locking tray T1 described above has a tapered shape with the opening area of ​​the top surface being larger than the area of ​​the bottom wall 1. Therefore, when multiple trays are stacked for storage without storing any items, the bottom of the upper locking tray T1 can be inserted through the top surface of the lower locking tray T1 as shown in FIG. 7 to stack them together to reduce bulk.

[0039] The locking structure according to the present invention can be applied not only to a tapered tray as in the above embodiment, but also to a normal tray in which the side walls 2 and end walls 3 stand upright.

[0040] Next, a second embodiment of the present invention will be described with reference to FIGS.

[0041] The locking tray T2 shown in Fig. 8 is assembled from the cardboard blank shown in Fig. 9. Fig. 10 to Fig. 13 show enlarged views of the main structural parts of the lock during and after assembly. The cardboard material is assumed to be thicker than that in the first embodiment (for example, B flute or thicker, approximately 3 mm).

[0042] In each drawing, the corrugation direction, which is the direction in which the corrugated crests of the corrugated cardboard core extend, is shown by multiple parallel straight lines within the cutout portion of the surface. Also, in Figure 9, an arrow indicating the corrugation direction is shown outside the cutout circle of the surface. Corrugated cardboard has the property that its strength is high in the corrugation direction and low in the direction crossing this.

[0043] <blank> As shown in Figure 9, the blank for this locking tray T2 has a rectangular bottom wall 1, a pair of widthwise side walls 2 and lengthwise end walls 3 arranged around the periphery of the bottom wall 1 at corners, with notches 4 made in the side walls 2 and connecting pieces 5 connected to the sides of the end walls 3. The side walls 2 and end walls 3 are rectangular so as to stand upright when assembled.

[0044] The cut 4 is L-shaped with a vertical cut 4a extending from the bottom wall 1 side to the tip side of the side wall 2 and a horizontal cut 4b extending from the vertical cut 4a in a direction away from the corner portion, and the inside and outside of the cut 4 of the side wall 2 are the side receiving portion 2a and the side abutment portion 2b, respectively. A certain amount of space is provided between the vertical cut 4a and the side end of the side wall 2.

[0045] The vertical cut 4a of the cut 4 is inclined toward the corner portion starting from the bottom wall 1 side, and the horizontal cut 4b is inclined in an upward direction from the connection side with the vertical cut 4a.

[0046] A diagonal fold line 6a is made in the side abutment portion 2b of the side wall 2, running from the horizontal cut 4b of the notch 4 to the upper edge so as to move away from the corner portion. There is no fold line that is an extension of the diagonal fold line 6a in the portion from the bottom wall 1 toward the vertical cut 4a. The diagonal fold line 6a is a lead crease consisting of a crease pressed from the back side of the cardboard and a cut.

[0047] The portion of the slit 4 on the vertical slit 4a side and the portion on the opposite side from the intersection of the horizontal slit 4b with the diagonal fold line 6a are respectively made into a receiving portion 4b1 and a retaining portion 4b2. In addition, to make it easier to open the slit 4 during assembly and to prevent the cardboard from tearing at the retaining portion 4b2, a curved slit 4c is provided downward from the end of the retaining portion 4b2.

[0048] In addition, a reverse fold line 7 is provided between the oblique fold line 6a and the corner on the side abutment portion 2b of the side wall 2, extending from the horizontal cut 4b toward the upper edge so as to approach the corner. The reverse fold line 7 is a lead crease formed by pressing the cardboard from the surface and a cut.

[0049] Furthermore, the side abutment portion 2b of the side wall 2 is formed with an opening 4d that is cut out so as to enlarge the longitudinal cut 4a.

[0050] The connecting piece 5 has a tongue-shaped locking portion 5b extending from a base portion 5a having an arcuate edge that is connected to the end wall 3. The locking portion 5b is shaped so that when it is inserted into the notch 4 of the side wall 2 during assembly, its upper edge is inclined in accordance with the inclination of the horizontal cut 4b of the notch 4.

[0051] Since the step direction of such a blank is oriented along the boundary between the bottom wall 1 and the side wall 2, the step direction of the side support portion 2b of the side wall 2 extends from the corner side across the reverse fold line 7 and the diagonal fold line 6a, and when the side support portion 2b is folded along the reverse fold line 7 and the diagonal fold line 6a during assembly, the side support portion 2b is less likely to bend irregularly.

[0052] <Assembly> To assemble the blank, as shown in Fig. 10, the side walls 2 and end walls 3 are successively raised from the bottom wall 1, the connecting pieces 5 are folded inward from the end walls 3, and the side abutment portions 2b of the side walls 2 are bent inward along the reverse fold lines 7 and the oblique fold lines 6a. At this time, the reverse fold lines 7 are bent in a direction that forms a valley fold when viewed from the surface of the cardboard, and the oblique fold lines 6a are bent in a direction that forms a mountain fold when viewed from the surface of the cardboard.

[0053] As a result, the diagonal fold line 6a and the reverse fold line 7, which exist only above the horizontal cut 4b, bend in opposite directions to each other, causing the upper part of the side support portion 2b to bend significantly, and the vertical cut 4a of the notch 4 and the receiving portion 4b1 of the horizontal cut 4b to open widely in the thickness direction of the cardboard, creating a gap between the side support portion 2a and the side support portion 2b.

[0054] 11, the end wall 3 is further swung in the upright direction, and the connecting piece 5 is aligned along the outer surface of the side abutment 2b, while the locking portion 5b of the connecting piece 5 is inserted into the inner surface of the side wall 2 through the gap between the side receiving portion 2a and the side abutment 2b. At this time, due to the presence of the opening 4d that enlarges the vertical cut 4a, even if the cardboard is thick, the edge of the locking portion 5b is unlikely to get caught on the side receiving portion 2a, and the locking portion 5b is inserted into the cut 4 while pushing and widening the removal prevention portion 4b2 of the horizontal cut 4b.

[0055] Thereafter, as shown in Figures 12 and 13, as the end wall 3 further swings in the upright direction, the engagement portion 5b of the connecting piece 5 is inserted into the notch 4, and when the engagement portion 5b passes the horizontal cut 4b, the bending along the diagonal fold line 6a and the reverse fold line 7 of the side wall 2 is restored, the retention portion 4b2 of the horizontal cut 4b closes, a "click" sound is heard, and the upper edge of the engagement portion 5b engages with the edge of the side abutment portion 2b facing the horizontal cut 4b, and the side wall 2 and end wall 3 are fixed in an upright position from the bottom wall 1.

[0056] <Effect of lock structure> In the above-described locking tray T2, when the side abutment portion 2b of the side wall 2 is folded along the reverse fold line 7 and the oblique fold line 6a during assembly, the oblique fold line 6a and the reverse fold line 7 are bent in opposite directions, the upper portion of the side abutment portion 2b is greatly bent, and the vertical cut 4a enlarged by the opening 4d of the slit 4 and the receiving portion 4b1 of the subsequent horizontal cut 4b are opened widely to create a gap, so that even if the cardboard material is thick, the locking portion 5b of the connecting piece 5 can be easily inserted into the gap. This allows the assembly work from a blank to be performed easily and efficiently.

[0057] In the assembled state, with the tip side of the engagement portion 5b of the connecting piece 5 inserted inside the side receiving portion 2a of the side wall 2, the anti-slip portion 4b2 of the horizontal cut 4b of the cut 4 closes, so that the connecting piece 5 will not come out of the cut 4 unless the connecting piece 5 is torn or forcibly bent.

[0058] In addition, the upper edge of the locking portion 5b inserted into the notch 4 is inclined upward from the base 5a side to the tip side in response to the inclination of the horizontal notch 4b, so that the edge facing the horizontal notch 4b engages with the upper edge of the locking portion 5b over a long distance rather than at a single point.

[0059] In this way, the notches 4 of the side walls 2 and the connecting pieces 5 of the end walls 3 are firmly interlocked, and the side walls 2 and the end walls 3 are securely fixed in an upright state from the bottom wall 1. Therefore, even when a heavy item is stored and lifted, the connecting pieces 5 will not unexpectedly come out of the notches 4 due to bending, and the stored item can be carried in a stable shape.

[0060] <Other> The locking structure of the locking tray T2 as described above can be applied not only to trays having upright side walls 2 and end walls 3 as in this embodiment, but also to tapered trays having a top opening area larger than the area of ​​the bottom wall 1. Such a tapered shape allows multiple trays to be stacked together for storage without storing any articles, so that they do not take up much space. [Explanation of symbols]

[0061] 1 Bottom wall 2 side wall 2a Side support part 2b Side support part 3 End Wall 4 Cutting 4a Vertical cut 4b Horizontal cut 4b1 Reception Department 4b2 retaining part 4c Curved cut 4d opening 5 Connecting piece 5a base 5b Locking part 6a,6b Diagonal fold line 7 Reverse fold line T1, T2 lockable tray

Claims

1. A locking tray is made of a blank having a bottom wall (1) around which side walls (2) and end walls (3) are connected at corners, a notch (4) is made in the side wall (2), and a connecting piece (5) is connected to the end wall (3), and the side wall (2) and the end wall (3) are raised from the bottom wall (1), and a locking portion (5b) extending from a base portion (5a) of the connecting piece (5) is inserted into the notch (4) to maintain the shape. The notch (4) of the side wall (2) has a vertical notch (4a) extending upward from the bottom wall (1) side and a horizontal notch (4b) extending from the upper end of the vertical notch in a direction away from the corner portion, and the inside and outside of the notch (4) of the side wall (2) are defined as a side receiving portion (2a) and a side abutting portion (2b), respectively. The side abutment portion (2b) has an oblique fold line (6a) extending from the horizontal slit (4b) toward the upper end so as to move away from the corner portion. The portion on the vertical slit (4a) side and the opposite portion from the intersection of the horizontal slit (4b) and the oblique fold line (6a) are respectively called receiving portions (4b). 1 ) and retaining portion (4b 2 ) and When the side abutment portion (2b) is folded inward along the oblique fold line (6a), the receiving portion (4b) of the vertical cut (4a) and the horizontal cut (4b) is formed. 1 ) opens to form a gap, and the locking portion (5b) of the horizontal cut (4b) is inserted into the gap from the outer surface side to the inner surface side of the side wall (2). 2 When the side wall (2) is pushed apart and inserted, the side wall (2) rebounds and restores its original shape, causing the stopper portion (4b) of the horizontal cut (4b) to fall out. 2 ) is closed, the upper edge of the engaging portion (5b) engages with the edge facing the horizontal cut (4b), and the side wall (2) and the end wall (3) are fixed in an upright position from the bottom wall (1).

2. 2. The locking tray according to claim 1, wherein the vertical cuts (4a) of the cuts (4) are inclined toward the corner portion from the bottom wall (1) side, and the horizontal cuts (4b) of the cuts (4) are inclined upward from the connection side with the vertical cuts (4a).

3. 3. The locking tray according to claim 2, characterized in that, when the engaging portion (5b) of the connecting piece (5) is inserted into the notch (4) of the side wall (2), the upper edge of the engaging portion (5b) is inclined in accordance with the inclination of the horizontal notch (4b) of the notch (4).

4. Each pair of side walls (2) and end walls (3) connected to the periphery of the bottom wall (1) are each an inverted trapezoid with an upper side longer than a lower side, and 2. The locking tray according to claim 1, wherein, in an assembled state, the tray has a tapered shape in which the area of ​​an opening on the top surface is larger than the area of ​​the bottom wall (1) forming the bottom surface.

5. 5. The locking tray according to claim 1, wherein the side support portion (2b) has, in addition to the oblique fold line (6a) above the horizontal cut (4b), an oblique fold line (6b) extending obliquely upward from the bottom wall (1) side toward the vertical cut (4a).

6. 6. The locking tray according to claim 5, characterized in that the blank is made of corrugated cardboard and the corrugation direction is oriented along the boundary between the bottom wall (1) and the end wall (3), whereby the corrugation direction of the connecting piece (5) extends from the base portion (5a) to the engaging portion (5b).

7. 5. The locking tray according to claim 1, wherein a reverse fold line (7) extending from the horizontal cut (4b) toward the upper end is provided in the side support portion (2b) between the oblique fold line (6a) above the horizontal cut (4b) and the corner portion.

8. 8. The locking tray according to claim 7, wherein the side abutment portion (2b) is formed with an opening (4d) cut out so as to enlarge the longitudinal cut (4a).

9. The locking tray according to claim 7, characterized in that the blank is made of corrugated cardboard, and the corrugation direction is oriented along the boundary between the bottom wall (1) and the side wall (2), thereby causing the corrugation direction of the side abutment portion (2b) to extend laterally from the corner portion side.

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