Picture frame structure, storage shelf

Abstract

This effectively suppresses deformation of the frame-like side walls. [Solution] The frame structure constitutes at least one side wall (12) of the tray (1). The frame structure is provided with an outer plate (24) that forms the outer surface of at least one side wall, an inner plate that forms the inner surface of at least one side wall, and an edge plate (33) that connects the upper edge (25) of the outer plate and the upper edge (29) of the inner plate. At both ends of the edge plate, the upper edge of the outer plate and the upper edge of the inner plate are brought closer together toward the outward direction in which the edge plate extends.

Description

Technical Field

[0001] The present invention relates to a frame structure and a storage shelf.

Background Art

[0002] Conventionally, as a storage box, one with four side walls formed in a frame shape is known (see, for example, Patent Document 1). In the storage box described in Patent Document 1, each outer wall rises from the four sides of a rectangular bottom wall, each narrow edge plate extends inward from the upper edge of each outer plate, and each inner plate descends from the inner edge of each edge plate. An adhesive margin is provided at the lower end of each inner plate, and the adhesive margin of each inner plate is adhered to the bottom wall with a gap between each outer plate and each inner plate, so that each side wall of the storage box is formed in a double-structured frame shape. By forming each side wall in a frame shape, the durability of the storage box is enhanced and the shape stability is improved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when a load is stored in the storage box described in Patent Document 1, there is a problem that when the side wall of the storage box is gripped and the storage box is pulled out or pushed in, the frame-shaped side wall is greatly deformed.

[0005] Therefore, an object of the present invention is to provide a frame structure and a storage shelf that can effectively suppress deformation of a frame-shaped side wall.

Means for Solving the Problems

[0006] A frame structure according to one aspect of the present invention is a frame structure that constitutes at least one side wall of a tray, comprising: an outer plate that forms the outer surface of the at least one side wall; an inner plate that forms the inner surface of the at least one side wall; and an edge plate that connects the upper edge of the outer plate and the upper edge of the inner plate, wherein at both ends of the edge plate, the upper edge of the outer plate and the upper edge of the inner plate are brought closer together toward the outward direction in the extending direction of the edge plate. [Effects of the Invention]

[0007] According to the present invention, at least one side wall is formed in a frame-like shape by an outer plate, an inner plate, and an edge plate. The edge plate on the upper surface of this frame-like side wall narrows outward in the extending direction, so that the shape of both ends of the edge plate approaches a triangle, stabilizing the edge plate shape and increasing the rigidity of the side wall. Furthermore, when the tray is pulled out or pushed in by gripping the frame-like side wall, the pulling force and pushing force are distributed by the three-dimensional shape consisting of the outer plate, inner plate, and edge plate, preventing the load from concentrating on a part of the side wall. The rigidity of the side wall is increased and the external force is distributed, effectively suppressing deformation of the side wall. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of the tray of the first embodiment, seen from the front. [Figure 2] This is a perspective view of the tray of the first embodiment, seen from the rear. [Figure 3] This is a plan view of the sheet material according to the first embodiment. [Figure 4] This figure shows an example of the tray assembly process according to the first embodiment. [Figure 5] This figure shows an example of the tray assembly process according to the first embodiment. [Figure 6] This diagram shows the amount of force applied when the tray is pulled out. [Figure 7] This is a perspective view of the tray of the second embodiment, seen from the front. [Figure 8] This is a plan view of the sheet material according to the second embodiment. [Figure 9]This is a perspective view of the storage shelf according to the first embodiment. [Figure 10] This is a schematic diagram of a modified tray. [Modes for carrying out the invention]

[0009] This embodiment will be described below with reference to the drawings. The arrows Fr, Rr, L, R, U, and Lo in each figure indicate the front, rear, left, right, top, and bottom sides of the tray when viewed from the front, respectively. In this embodiment, terms indicating direction and position are used, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[0010] <First Embodiment> The tray of the first embodiment will be described with reference to Figures 1 to 3. Figure 1 is a front perspective view of the tray of the first embodiment. Figure 2 is a rear perspective view of the tray of the first embodiment. Figure 3 is a plan view of the sheet material of the first embodiment.

[0011] As shown in Figures 1 and 2, the tray 1 is designed to be able to be pushed and pulled in the front-rear direction by gripping the frame-shaped front wall 12 when items are stored inside. The bottom wall 11 of the tray 1 is formed in a rectangular shape when viewed from above, with the front wall (at least one side wall) 12 and the rear wall 13 rising from the front and rear edges of the bottom wall 11, and a pair of side walls 14 rising from both the left and right sides of the bottom wall. The rear wall 13 and the pair of side walls 14 of the tray 1 are single-layered, but the front wall 12 of the tray 1 is formed in a double-layered frame shape to increase rigidity. The front wall 12 of the tray 1 is formed into a three-dimensional shape by multiple slopes, and the appearance is improved by creating multiple ridges and shadows.

[0012] The outer surface of the front wall 12 is formed by an outer plate 24, and the inner surface of the front wall 12 is formed by an inner plate 28, with the upper edge 25 of the outer plate 24 and the upper edge 29 of the inner plate 28 connected by an edge plate 33. The edge plate 33 is formed in a crystal shape, and at both ends of the edge plate 33, the upper edge 25 of the outer plate 24 and the upper edge 29 of the inner plate 28 are brought closer together toward the outside in the direction of extension of the edge plate 33. More specifically, the upper edge 25 of the outer plate 24 is formed by three straight sections that bulge outwards from both sides toward the center of the tray, and the upper edge 29 of the inner plate 28 is formed by three straight sections that bulge inwards from both sides toward the center of the tray. The straight sections on both sides of the upper edge 25 of the outer plate 24 and the upper edge 29 of the inner plate 28 are inclined to move closer together toward the outside in the left-right direction.

[0013] By bringing the upper edges 25 of the outer plate 24 and 29 of the inner plate 28 closer together, the left and right portions of the edge plate 33 are formed into a roughly triangular shape, stabilizing the edge plate shape and increasing the rigidity of the front wall 12. In addition, the outer plate 24 is inclined to protrude outwards from the lower edge towards the upper edge 25 of the tray, and the inner plate 28 is inclined to protrude inwards from the lower edge towards the upper edge 29 of the tray. In cross-sectional view, the outer plate 24, inner plate 28, and edge plate 33 are formed into a roughly triangular shape, stabilizing the cross-sectional shape of the front wall 12 and increasing its rigidity. The rigidity of the front wall 12 is further increased by the fact that the edge plate 33 is not a straight shape of a constant width, but is formed into a crystal shape (roughly hexagonal shape).

[0014] The upper edge 29 of the inner plate 28 is formed higher than the upper edge 25 of the outer plate 24, and the edge plate 33 is sloped so that it rises from the outside of the tray towards the inside of the tray. This makes it easier to grip the frame-shaped front wall 12 with your fingers, improving the work efficiency of inserting and removing the tray 1 while gripping the front wall 12. The central part of the edge plate 33 is the widest, making it easier to grip the front wall 12 with your palm. The outer plate 24 has rounded square-shaped hand holes 26, so you can also grip the hand holes 26 with your fingers instead of gripping the front wall 12 with your palm. Even when the tray 1 is full of items and it is difficult to grip the front wall 12, you can still grip the tray 1 with the hand holes 26 of the outer plate 24 and insert or remove it.

[0015] A pair of front flaps 34 are provided at the front edges of the pair of side walls 14, and a pair of rear flaps 41 are provided at the rear edges of the pair of side walls 14. The pair of front flaps 34 enter between the outer plate 24 and the inner plate 28 of the front wall 12, and the edge plate 33 is supported from below by a pair of fins 35 provided on the pair of front flaps 34. The pair of fins 35 suppress the dropping of the edge plate 33 and enhance the rigidity of the front wall 12. The pair of rear flaps 41 are in contact with the rear wall 13 from the rear, and a pair of connecting pieces 42 provided on the pair of rear flaps 41 are inserted into the slits 23 of the rear wall 13. Inside the rear wall 13, the pair of connecting pieces 42 are folded back and hooked on the bottom wall 11.

[0016] As shown in FIG. 3, the sheet material 5 shows the tray 1 in a deployed state and is formed by cutting out a single cardboard sheet with a die cutter or the like. The cardboard sheet is a double-sided cardboard sheet in which a corrugated core 6 is bonded to a front liner and a back liner. FIG. 3 shows the cardboard sheet as viewed from the front liner side. In the following description, the direction in which the step tops of the core 6 of the cardboard sheet extend is defined as the "step direction X", and the direction orthogonal to the core 6 of the cardboard sheet is defined as the "flow direction Y". Also, in FIG. 3, the step direction X of the sheet material 5 is aligned with the front-rear direction, and the flow direction Y of the sheet material 5 is aligned with the left-right direction.

[0017] A substantially rectangular bottom wall 11 is provided at the center of the sheet material 5. On one side of the bottom wall 11 in the step direction X, the outer plate 24 is continuous via a fold line L1. On one side of the outer plate 24 in the step direction X, the edge plate 33 is continuous via a fold line L2. On one side of the edge plate 33 in the step direction X, the inner plate 28 is continuous via a fold line L3. The fold line L1 is divided into a straight line section L1a at the center in the flow direction Y and straight line sections L1b on both sides sandwiching the straight line section L1a. The straight line section L1a extends parallel to the flow direction Y, and the straight line sections L1b extend obliquely from both ends of the straight line section L1a, causing the fold line L1 to bulge slightly on one side in the step direction X. A pair of retaining holes 21 are formed in the bottom wall 11 along the straight line section L1b.

[0018] The broken line L2 is divided into a straight line section L2a at the center in the flow direction Y and straight line sections L2b on both sides sandwiching the straight line section L2a. The straight line section L2a extends parallel to the flow direction Y, and the straight line sections L2b extend obliquely from both ends of the straight line section L2a, with the broken line L2 slightly bulging toward the other side in the step direction X. The broken line L3 is divided into a straight line section L3a at the center in the flow direction Y and straight line sections L3b on both sides sandwiching the straight line section L3a. The straight line section L3a extends parallel to the flow direction Y, and the straight line sections L3b extend obliquely from both ends of the straight line section L3a, with the broken line L3 slightly bulging toward one side in the step direction X. Both ends of the broken lines L2 and L3 are slightly separated in the step direction X.

[0019] The tip 31 of the inner plate 28 is divided into a straight line section 31a at the center in the flow direction Y and straight line sections 31b on both sides sandwiching the straight line section 31a. The straight line section 31a extends parallel to the flow direction Y, and the straight line sections 31b extend obliquely from both ends of the straight line section 31a, with the tip 31 of the inner plate 28 slightly recessed toward the other side in the step direction X. Retaining protrusions 32 that enter the pair of retaining holes 21 in the bottom wall 11 are provided on the straight line sections 31b of the tip 31 of the inner plate 28. Also, a pair of broken lines L4 extend from the broken line L1 toward the tip 31 of the inner plate 28 so as to cross the outer plate 24, the edge plate 33, and the inner plate 28 in the step direction X. The outer plate 24, the edge plate 33, and the inner plate 28 are each partitioned into three regions by the pair of broken lines L4.

[0020] Each broken line L4 is divided into a straight line section L4a at the center in the step direction X and straight line sections L4b and L4c on both sides sandwiching the straight line section L4a. The straight line section L4a connects the ends of the straight line section L2a and the straight line section L3a, the straight line section L4b connects the ends of the straight line section L1a and the straight line section L2a, and the straight line section L4c connects the ends of the straight line section L3a and the straight line section 31a. The edge plate 33 is formed in a crystal shape by a rectangular region surrounded by the straight line sections L2a, L3a, and L4a and a triangular region surrounded by the straight line sections L2b, L3b, and L4a. A folded-back piece 27 is connected to the trapezoidal region of the outer plate 24 surrounded by the straight line sections L1a, L2a, and L4b via a broken line L5.

[0021] A rectangular rear wall 13 is connected to the other side of the bottom wall 11 in the step direction X via a fold line L6, and a pair of latching holes 22 are formed in the bottom wall 11 spaced apart in the flow direction Y along the fold line L6. A pair of slits 23 are formed in the rear wall 13, inclined away from the fold line L6 from the center to both ends in the flow direction Y. A pair of rectangular side walls 14 are connected to the outside of the bottom wall 11 in the flow direction Y via a fold line L7. A roughly trapezoidal front flap 34 is connected to one side of each side wall 14 in the step direction X via a fold line L8, and a roughly triangular rear flap 41 is connected to the other side of each side wall 14 in the step direction X via a fold line L9.

[0022] Each front flap 34 has a notch 38 at its tip 36, which is half the shape of a handhole. The notch 38 of each front flap 34 is formed at a position corresponding to the folded-over piece 27 of the outer plate 24 when the tray 1 is assembled. A rectangular fin 35 is provided on the outside of the flow direction Y at the tip side of each front flap 34 via a fold line L10. The fin 35 of each front flap 34 is formed at a position corresponding to the rectangular area enclosed by the straight sections L2a, L3a, and L4a of the edge plate 33 when the tray 1 is assembled. The beveled edge 39 on the outside of the flow direction Y at the base side of each front flap 34 corresponds to the straight section L2b (upper edge 25 of the outer plate 24) when the tray 1 is assembled.

[0023] Each rear flap 41 has a connecting piece 42 on its beveled edge 43 via fold lines L11 and L12. The connecting piece 42 of each rear flap 41 is positioned so that it can be inserted into the slit 23 of the rear wall 13 when assembling the tray 1. The other side edge of each connecting piece 42 in the step direction X is provided with a hooking projection 44 that fits into the hooking hole 22 of the bottom wall 11. Fold lines L1, L5-L9, and L11 are formed by crease lines, and fold lines L2-L4, L10, and L12 are formed by lead lines. A crease line is a fold line created by pressing a corrugated cardboard sheet in a straight line from the liner side, while a lead line is a crease line with multiple intermittent cuts formed on it.

[0024] The assembly process for the tray of the first embodiment will be described with reference to Figures 4 and 5. Figures 4 and 5 show an example of the assembly process for the tray of the first embodiment. The tray may be assembled manually by an operator, or it may be assembled automatically or semi-automatically by a box-making machine. Here, as an example, the case in which an operator assembles the tray will be described, but the order of the assembly work can be changed as appropriate. This will be explained with reference to Figure 3 as appropriate.

[0025] As shown in Figures 4(A) and 4(B), the back liner of the sheet material 5 (see Figure 3) is oriented upward, and the rear wall 13 is folded upward along the fold line L6, so that the rear wall 13 is raised relative to the bottom wall 11. A pair of side walls 14 are folded upward along the fold line L7, so that the pair of side walls 14 are raised relative to the bottom wall 11. A pair of rear flaps 41 are folded inward along the fold line L9 and positioned on the rear side of the rear wall 13. The connecting pieces 42 of the pair of rear flaps 41 are folded along the fold lines L11 and L12, so that the pair of connecting pieces 42 are inserted into a pair of slits 23 in the rear wall 13, and the hooking projections 44 of the pair of connecting pieces 42 are hooked into a pair of hooking holes 22 in the bottom wall 11.

[0026] As shown in Figures 5(A) and 5(B), the pair of front flaps 34 are folded inward along the fold line L8 so that the tips of the pair of front flaps 34 face each other. The outer plate 24 is folded upward along the fold line L1 so that the outer plate 24 is raised against the bottom wall 11. Next, the edge plate 33 is folded backward along the fold line L2 so that the fins 35 of the pair of front flaps 34 are pressed against the lower surface of the edge plate 33. The inner plate 28 is folded downward along the fold line L3 so that the pair of hooking protrusions 32 are hooked into the pair of hooking holes 21 in the bottom wall 11 to form a frame-shaped front wall 12. Then, the folded-back piece 27 (see Figure 3) is folded back along the fold line L5 to form a hand hole.

[0027] In this configuration, the frame-shaped front wall 12 is folded along the fold line L4, and the front wall 12 is formed three-dimensionally by multiple planes. The edge plate 33 on the upper surface of the front wall 12 is formed in a crystal shape, and the shape of the edge plate 33 increases the rigidity of the front wall 12, suppressing deformation of the front wall 12 even when pulling or pushing forces are applied to it. Furthermore, because the edge plate 33 is formed in a crystal shape, the pulling and pushing forces acting on the front wall 12 are distributed, preventing the load from concentrating on any part of the front wall 12. In this way, the strength of the front wall 12 is increased by its three-dimensional construction.

[0028] Here, we will explain the force applied when the tray is pulled out. Figure 6 shows the force applied when the tray is pulled out. Figure 6(A) shows the tray of the comparative example pulled out, and Figure 6(B) shows the tray of the first embodiment pulled out.

[0029] As shown in Figure 6(A), in the comparative example tray 91, the edge plate 93 of the front wall 92 is formed in a straight shape of a constant width. When luggage 99 is stored in the tray 91 and the tray 91 is pulled out by gripping the front wall 92, the pulling force acts directly on the corner 95 of the front wall 92 and the pair of side walls 94. Because the direction of the pulling force and the front edge of the edge plate 93 are perpendicular, the pulling force is concentrated on the corner 95 without being dispersed, causing the tray 91 to tear and break starting from the corner 95. In addition, the rigidity of the front wall 92 is not sufficient, so the front wall 92 deforms due to the pulling force.

[0030] On the other hand, as shown in Figure 6(B), in the tray 1 of the first embodiment, the edge plate 33 of the front wall 12 is formed in a crystal shape, so even if the tray 1 is pulled out by gripping the front wall 12, the pulling force transmitted to the corners 45 of the front wall 12 and the pair of side walls 14 is reduced. Because the direction of the pulling force and the front edge 33 (upper edge 25 of the outer plate 24) intersect at an angle, the pulling force is dispersed and transmitted to the front wall 12, so the pulling force does not concentrate at the corners 45, and damage to the tray 1 starting from the corners 45 is suppressed. In addition, the rigidity of the front wall 12 is also increased, so the front wall 12 does not deform due to the pulling force.

[0031] As described above, according to the first embodiment, the front wall 12 is formed in a frame-like shape by the outer plate 24, the inner plate 28, and the edge plate 33. The edge plate 33 on the upper surface of the front wall 12 narrows in width toward the outward direction in the extending direction, so that the shape of both ends of the edge plate 33 approaches that of a triangle, stabilizing the edge plate shape and increasing the rigidity of the side wall. In addition, when the tray 1 is pulled out or pushed in by gripping the front wall 12, the pulling force and pushing force are distributed by the three-dimensional shape consisting of the outer plate 24, the inner plate 28, and the edge plate 33, so that the load does not concentrate on a part of the front wall 12. The rigidity of the front wall 12 is increased and the external force is distributed, so that the deformation of the front wall 12 is effectively suppressed.

[0032] <Second Embodiment> The tray of the second embodiment will be described with reference to Figures 7 and 8. The tray of the second embodiment differs from the tray of the first embodiment in that not only the front wall but also the rear wall and a pair of side walls are formed in a frame shape, and the bottom wall is formed with a one-touch bottom. Figure 7 is a perspective view of the tray of the second embodiment as seen from the front. Figure 8 is a plan view of the sheet material of the second embodiment. Note that the explanation of the configuration corresponding to the first embodiment will be omitted as much as possible.

[0033] As shown in Figure 7, the bottom wall 53 of the tray 51 is formed in a rectangular shape when viewed from above. A front wall (at least one side wall) 56 and a rear wall 54 rise from the front and rear edges of the bottom wall 53, and a pair of side walls 55 and 57 rise from both the left and right sides of the bottom wall 53. The rear wall 54 and the pair of side walls 55 and 57 of the tray 51 are formed in a frame shape of a certain width, and the front wall 56 of the tray 51 is formed in a frame shape with a crystal-shaped edge plate 74 on the top surface. The rigidity of the front wall 56 of the tray 51 is increased by forming the front wall 56 in a three-dimensional shape similar to that of the first embodiment. The edge plate 74 is inclined to become higher from the outside of the tray to the inside of the tray, and a finger hole 75 is formed in the front wall 56.

[0034] As shown in Figure 8, in the sheet material 52, a roughly rectangular joint 58, a rear outer plate 67, one side outer plate 69, a front outer plate (outer plate) 72, and the other side outer plate 78 are arranged in opposite directions of the flow direction Y via fold lines L21-L24. A rectangular rear inner plate 68 is connected to one side of the rear outer plate 67 in the step direction X via fold lines L25 and L26, and a roughly trapezoidal rear bottom plate 61 is connected to the other side of the rear outer plate 67 in the step direction X via fold line L27. An adhesive piece 65 is provided on the rear bottom plate 61 via a reverse fold line L28. A rectangular side inner plate 71 is connected to one side of the one side outer plate 69 in the step direction X via fold lines L29 and L30, and a roughly trapezoidal side bottom plate 62 is connected to the other side of the one side outer plate 69 in the step direction X via fold line L31.

[0035] An edge plate 74 is connected to one side of the front outer plate 72 in the step direction X via a fold line L32, and an inner front plate (inner plate) 73 is connected to one side of the edge plate 74 in the step direction X via a fold line L33. The fold line L32 is divided into an arc-shaped section L32a in the center of the flow direction Y and straight sections L32b on both sides of the arc-shaped section L32a. The arc-shaped section L32a extends with a slight curve, and straight sections L32b extend diagonally from both ends of the arc-shaped section L32a, causing the fold line L32 to bulge slightly on the other side in the step direction X. The fold line L33 is divided into a straight section L33a in the center of the flow direction Y and straight sections L33b on both sides of the straight section L33a. The straight section L33a extends parallel to the flow direction Y, and straight sections L33b extend diagonally from both ends of the straight section L33a, causing the folded line L33 to bulge slightly on one side in the step direction X.

[0036] The front inner plate 73 is provided with a pair of anchoring protrusions 77 spaced apart in the flow direction Y at its tip 76. A pair of fold lines L34 extend from fold line L32 to the tip 76 of the front inner plate 73, traversing the edge plate 74 and the front inner plate 73 longitudinally in the step direction X. The pair of fold lines L34 divide the edge plate 74 and the front inner plate 73 into three regions each. Each fold line L34 is divided into a straight section L34a within the edge plate 74 and a straight section L34b within the front inner plate 73. The edge plate 74 is formed into a crystal shape by the roughly rectangular region enclosed by the arc-shaped section L32a and the straight sections L33a and L34a, and the triangular region enclosed by the straight sections L32b, L33b and L34a. In addition, a folded-back piece 81 is connected to the center of the front outer plate 72 via fold line L35.

[0037] On the other side of the front outer plate 72 in the step direction X, a roughly trapezoidal front bottom plate 63 is connected via a fold line L36. A pair of latching holes 82 into which a pair of latching projections 77 are inserted are formed in the front bottom plate 63 along the fold line L36. The rear bottom plate 61 is provided with an adhesive piece 66 via a reverse fold line L37. On one side of the other side outer plate 78 in the step direction X, a rectangular side inner plate 79 is connected via fold lines L38 and L39, and on the other side of the other side outer plate 78 in the step direction X, a roughly trapezoidal side bottom plate 64 is connected via a fold line L40. In the sheet material 52, adhesive pieces 65 and 66 are bonded to the side bottom plates 62 and 64 to form a one-touch bottom, and a joint 58 is bonded to the other side outer plate 78 to form a folding cylinder with the rear outer plate 67, the front outer plate 72, and the pair of side outer plates 69 and 78.

[0038] When assembling the tray 51, the folding cylinder is raised, and a rectangular cylinder is formed by the rear outer plate 67, the front outer plate 72, and a pair of side outer plates 69 and 78. As the folding cylinder is raised, the rear bottom plate 61, the front bottom plate 63, and the pair of side bottom plates 62 and 64 are raised, forming the bottom wall 53. The rear inner plate 68 and the pair of side inner plates 71 and 79 are folded inward, forming the rear wall 54 and the pair of side walls 55 and 57 in a frame-like shape. In addition, the edge plate 74 and the front inner plate 73 are folded inward, and a pair of hooking protrusions 77 are hooked into a pair of hooking holes 82, forming the front wall 56 in a frame-like shape. The front wall 56 is formed three-dimensionally by multiple planes, which increases its strength.

[0039] As described above, in the second embodiment as well, the rigidity of the front wall 56 is increased and the external force is distributed, thereby effectively suppressing the deformation of the front wall 56.

[0040] Next, we will describe the results of the sensory evaluation of the trays. Here, sensory evaluation was conducted on trays 1 through 6, each with a different frame shape. In tray 1, the lens-shaped frame (top surface) is inclined so as to be higher towards the inside of the tray. In tray 2, the crystal-shaped frame is inclined so as to be higher towards the inside of the tray. In tray 3, the crystal-shaped frame is inclined so as to be lower towards the inside of the tray. In tray 4, the crystal-shaped frame is formed horizontally. In tray 5, the wide, straight-shaped frame is formed horizontally. In tray 6, the narrow, straight-shaped frame is formed horizontally.

[0041] Each tray used BF corrugated cardboard with LC160 specified in JIS P3902 for the front and back liners, and MC120 specified in JIS P3904 for the core. The strength at which buckling occurred was measured by pulling the edge of the tray with a push-pull gauge, and the average value was calculated after three measurements for each type of tray. The test results shown in Table 1 below were obtained. Sufficient strength was obtained for trays 1 to 4, with a strength of 90 [N] or more, but tray 5 tore at the corner without buckling at around 60 [N], and tray 6 buckled without withstanding at around 43 [N]. As a result, it was found that the strength of the edge is improved when the width of the edge narrows towards both ends, that is, when the upper edge of the outer plate and the upper edge of the inner plate are brought closer together toward the outer side in the direction of extension of the edge plate at both ends. [Table 1]

[0042] Furthermore, the trays of the first and second embodiments are preferably used in storage shelves. For example, in the storage shelf 7 shown in Figure 9, the tray 1 of the first embodiment is stored in the shelf frame 8 so that it can be moved in and out in the front-to-back direction. Because the front wall 12 of the tray 1 is formed with the frame structure described above, deformation of the front wall 12 is suppressed, making it easier to grip the front wall 12 and move the tray 1 in and out.

[0043] Furthermore, in the first and second embodiments, the edge plate (frame) of the tray is formed in a crystal shape, but at both ends of the edge plate, it is sufficient that the upper edges of the outer plate and the inner plate are brought closer together toward the outer side in the direction of extension of the edge plate. For example, as shown in Figure 10, the upper edge of the outer plate 85 may be formed in an arc shape that bulges outward from both sides toward the center of the tray, and the upper edge of the inner plate 87 may be formed in an arc shape that bulges inward from both sides toward the center of the tray, so that the edge plate 89 is formed in a lens shape. When the tray is pulled out or pushed in by gripping the frame, the pulling force and pushing force are distributed by the upper edges of the outer plate and the inner plate. This suppresses the concentration of load on the upper corners of the frame and prevents damage to the tray. In addition, the edge plate of the tray may be formed in a polygonal shape other than a crystal shape.

[0044] Furthermore, in the first and second embodiments, the front wall is formed with a reinforced frame structure, but it is sufficient if at least one side wall of the tray is formed with a reinforced frame structure. For example, both the front and rear walls may be formed with a reinforced frame structure.

[0045] Furthermore, in the first and second embodiments, the upper edge of the inner plate is formed higher than the upper edge of the outer plate, but the upper edges of the outer plate and the inner plate may be formed at the same height. Because the edge plate extends horizontally, the rigidity of the edge plate against horizontal forces such as pulling and pushing forces is increased.

[0046] Furthermore, in the first and second embodiments, the edge plates of the tray are formed symmetrically, but the edge plates of the tray may be formed asymmetrically.

[0047] Furthermore, in the first embodiment, the ends of the upper edge of the outer plate and the ends of the upper edge of the inner plate are spaced apart, but the ends of the upper edge of the outer plate and the ends of the upper edge of the inner plate may be in contact. Also, the upper edge of the outer plate and the upper edge of the inner plate may be in contact with each other in the left-right direction, beyond the upper corner of the front wall.

[0048] In the second embodiment, both ends of the upper edge of the outer plate and both ends of the upper edge of the inner plate are in contact, but they may be spaced apart. Also, the upper edges of the outer plate and the upper edges of the inner plate may be in contact with each other in the left-right direction, beyond the upper corner of the front wall.

[0049] Furthermore, in the first embodiment, the center of the upper edge of the outer plate is formed in a straight line, and in the second embodiment, the center of the upper edge of the outer plate is formed in an arc shape that bulges outward from the tray, but the center of the upper edge of the outer plate may be formed in an arc shape that is concave inward from the tray. Also, in the first and second embodiments, the center of the upper edge of the inner plate is formed in a straight line, but the center of the upper edge of the inner plate may be formed in an arc shape that is concave outward from the tray.

[0050] Furthermore, in the first and second embodiments, the crystal-shaped edge plate is given a fold that divides it into a triangular region and a rectangular region, but the edge plate does not necessarily have to have a fold.

[0051] Furthermore, in the first and second embodiments, the upper edges of the outer and inner plates extend continuously, but the upper edges of the outer and inner plates may be partially divided by openings, handholes, etc.

[0052] Furthermore, in the first and second embodiments, the fold lines are not limited to fold lines or lead lines, but may be formed by perforation lines, half-cut lines, etc., as long as the corrugated cardboard sheet is bendable. A perforation line is a fold line with a longer cut than a lead line, and a half-cut line is a fold line in which a cut is made up to half the thickness of the corrugated cardboard sheet.

[0053] Furthermore, in the first and second embodiments, the tray is formed from a double-sided corrugated cardboard sheet, but the tray may also be formed from a single-sided corrugated cardboard sheet, a double-sided corrugated cardboard sheet, single sheet paper, cardboard, resin sheet, etc.

[0054] As described above, the first embodiment is a frame structure that constitutes at least one side wall (front wall 12, 56) of a tray (1, 51), comprising an outer plate (24, front outer plate 72) that forms the outer surface of at least one side wall, an inner plate (28, front inner plate 73) that forms the inner surface of at least one side wall, and edge plates (33, 74) that connect the upper edge of the outer plate and the upper edge of the inner plate, wherein at both ends of the edge plate, the upper edge of the outer plate and the upper edge of the inner plate are brought closer together toward the outward direction in which the edge plate extends. With this configuration, at least one side wall is formed in a frame shape by the outer plate, the inner plate and the edge plate. As the edge plate on the upper surface of this frame-shaped side wall narrows toward the outward direction in which it extends, the shape of both ends of the edge plate approaches a triangular shape, the shape of the edge plate becomes stable and the rigidity of the side wall is increased. Furthermore, when the tray is pulled out or pushed in by gripping the frame-like side wall, the pulling and pushing forces are distributed by the three-dimensional shape consisting of the outer plate, inner plate, and edge plate, preventing the load from concentrating on a part of the side wall. The rigidity of the side wall is increased, and the external force is distributed, effectively suppressing deformation of the side wall.

[0055] In the second embodiment, the upper edge of the inner panel is formed higher than the upper edge of the outer panel, as in the first embodiment. This configuration makes it easier to grip the frame-like outer wall with your fingers, improving the work efficiency when inserting and removing the tray.

[0056] In the third embodiment, the upper edge of the outer plate and the upper edge of the inner plate are formed at the same height as in the first embodiment. With this configuration, the edge plate extends horizontally, which increases the rigidity of the edge plate against horizontal forces such as pulling and pushing forces.

[0057] The fourth embodiment is one of the first to third embodiments, in which hand holes (26, 75) are formed in the outer panel. With this configuration, even if the tray is filled with luggage and the frame-shaped outer wall is difficult to grip, the tray can be gripped by the hand holes formed in the outer panel.

[0058] The fifth embodiment is one of the first to fourth embodiments, in which an inner flap (front flap 34) is inserted between the outer plate and the inner plate, and the edge plate is supported from below by a fin (35) provided on the inner flap. With this configuration, the fin prevents the edge plate from sagging, and the rigidity of the frame-shaped side wall is increased.

[0059] The sixth embodiment is an embodiment of any one of the first to fifth embodiments in which the upper edge of the outer plate is formed in an arc shape that bulges outward from both sides towards the center of the tray, and the upper edge of the inner plate is formed in an arc shape that bulges inward from both sides towards the center of the tray, and the edge plate is formed in a lens shape. With this configuration, when the tray is pulled out or pushed in by gripping the frame-shaped side wall, the pulling force and pushing force are distributed by the arc-shaped upper edges of the outer plate and inner plate. The concentration of load on the upper corner of the tray is suppressed, and damage to the tray is prevented.

[0060] The seventh embodiment is one of the first to fifth embodiments, in which the upper edge of the outer plate is formed of multiple straight sections that bulge outwards from both sides towards the center of the tray, and the upper edge of the inner plate is formed of multiple straight sections that bulge inwards from both sides towards the center of the tray, and the edge plate is formed in a polygonal shape. With this configuration, when the tray is pulled out or pushed in by gripping the frame-shaped side wall, the pulling force and pushing force are distributed by the multiple straight sections of the upper edges of the outer plate and inner plate. The concentration of load on the upper corners of the tray is suppressed, and damage to the tray is prevented.

[0061] The eighth embodiment is a storage shelf (7) comprising a tray having a frame structure as described in any one of the first to seventh embodiments, and a shelf frame (8) in which the tray is stored so as to be able to be moved in and out in the front-to-back direction, wherein at least the front side wall of the tray is made of a frame structure. With this configuration, deformation of the front side wall is suppressed, making it easy to move the tray in and out by gripping the front side wall.

[0062] Although this embodiment has been described, other embodiments may include combinations of the above embodiments and modifications, either entirely or partially.

[0063] Furthermore, the technology of the present invention is not limited to the embodiments described above, and may be modified, substituted, or transformed in various ways without departing from the spirit of the technical idea. Moreover, if the technical idea can be realized in a different way by advances in the technology or by other derived technologies, it may be implemented by that method. Accordingly, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of Symbols]

[0064] 1. 51: Tray 7: Storage shelves 8:Shelf frame 12, 56: Front wall (at least one side wall) 24: Exterior panels 26, 75: Hand hole 28: Inner plate 33, 74: Edge board 34: Front flap (inner flap) 35: Fin 72: Front outer panel (outer panel) 73: Front inner plate (inner plate)

Claims

1. A frame structure that constitutes at least one side wall (12, 56) of the tray, The outer plate (24, 72) forming the outer surface of at least one side wall, An inner plate (28, 73) forming the inner surface of at least one side wall, It comprises edge plates (33, 74) connecting the upper edge of the outer plate and the upper edge of the inner plate, A picture frame structure characterized in that at both ends of the edge plate, the upper edge of the outer plate and the upper edge of the inner plate are brought closer together toward the outward direction in the extending direction of the edge plate.

2. The picture frame structure according to claim 1, characterized in that the upper edge of the inner plate is formed to be higher than the upper edge of the outer plate.

3. The picture frame structure according to claim 1, characterized in that the upper edge of the outer panel and the upper edge of the inner panel are formed at the same height.

4. The picture frame structure according to claim 1, characterized in that hand holes (26, 75) are formed in the outer panel.

5. The picture frame structure according to claim 1, characterized in that an inner flap (34) is inserted between the outer plate and the inner plate, and the edge plate is supported from below by a fin (35) provided on the inner flap.

6. The upper edge of the outer plate is formed in an arc shape that bulges outwards from both side edges towards the center of the tray. The upper edge of the inner plate is formed in an arc shape that bulges inward from both side edges towards the center of the tray. The picture frame structure according to claim 1, characterized in that the edge plate is formed in a lens shape.

7. The upper edge of the outer plate is formed by multiple straight sections that bulge outwards from both side edges towards the center of the tray. The upper edge of the inner plate is formed by multiple straight sections that bulge inward from both side edges towards the center of the tray. The picture frame structure according to claim 1, characterized in that the edge plate is formed in a polygonal shape.

8. A tray with a frame structure according to any one of claims 1 to 7, The tray is housed in a shelf frame (8) that can be moved in and out in the front-to-back direction, A storage shelf characterized in that at least the front side wall of the tray is made of the frame structure.

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