Receiving box, seat material for receiving box

Abstract

To provide a receiving box, and seat material for the receiving box allowing stacking in a stable state.SOLUTION: A receiving box (1) is configured to be allowed stacking vertically in a state of receiving contents. The receiving box is provided with: a bottom wall (11) having an outer edge in a first direction and in a second direction intersecting each other; firs side walls (12) in a double structure placed at both end edges in the first direction of the bottom wall; a second side wall (13) placed at least at one end edge in the second direction of the bottom wall; and sash plates (14) extending from the upper edge of the second side wall to the first side wall so as to cover the same. At an end part of the first side wall over which the sash plates are covered, an inner side of an upper surface (17) of the first side wall is formed lower than an outer side thereof and a part of a lower surface of the sash plate is formed lower than an upper surface of a middle part of the first side wall exposed from the sash plate.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a storage box and a sheet material for the storage box.

Background Art

[0002] Conventionally, as a type of storage box, a tray with crosspieces is known so that the upper tray does not fall into the lower tray when stacked in multiple layers (see, for example, Patent Document 1). In the tray described in Patent Document 1, a pair of side walls facing each other in the short side direction are formed in a double-structured frame shape, and a pair of crosspieces are connected to the upper edges of the pair of side walls facing each other in the long side direction. A pair of connecting holes are formed at both longitudinal ends of each frame-shaped side wall, and a pair of connecting pieces are formed at both short side ends of each crosspiece. A pair of crosspieces are placed on the pair of frame-shaped side walls from above, and the connecting pieces of the crosspieces are inserted into the connecting holes, thereby connecting the pair of frame-shaped side walls and the pair of crosspieces.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the tray of Patent Document 1, since the crosspieces are placed on the frame-shaped side walls, steps are formed at the four corners of the tray, and when stacked in multiple layers, the gap between the upper and lower trays becomes large, making it difficult to stack the trays in a stable state.

[0005] Therefore, an object of the present invention is to provide a storage box and a sheet material that can be stacked in a stable state.

Means for Solving the Problems

[0006] The storage box according to one aspect of the present invention is a storage box that can be stacked vertically with the contents stored therein, and includes a bottom wall having outer edges along intersecting first and second directions, first side walls of a double structure positioned at both end edges of the bottom wall in the first direction, a second side wall positioned at at least one end edge of the bottom wall in the second direction, and a crossbar extending from the upper edge of the second side wall so as to cover the first side wall. At the end of the first side wall covered by the crossbar, the inner side is formed lower than the outer side of the upper surface of the first side wall, and a part of the lower surface of the crossbar is lower than the upper surface of the middle part of the first side wall exposed from the crossbar.

Advantages of the Invention

[0007] According to the present invention, since the inner side is formed lower than the outer side of the upper surface of the first side wall covered by the crossbar, when a plurality of storage boxes are stacked, the crossbar of the lower storage box is likely to sink under the load of the upper storage box. It becomes difficult to create a step between the upper surface of the first side wall and the crossbar, and when stacked in multiple layers, the gap between the upper and lower storage boxes becomes smaller, and a plurality of storage boxes can be stacked in a stable state.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0009] Hereinafter, this embodiment will be described with reference to the drawings. Arrows Fr, Rr, L, R, U, and Lo attached to each figure indicate the front side, rear side, left side, right side, upper side, and lower side, respectively, when the packing box is viewed from the front. Also, in this embodiment, terms indicating directions and positions are used, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[0010] <The First Embodiment> With reference to FIGS. 1 to 3, the tray of the first embodiment will be described. FIG. 1 is a perspective view of the tray of the first embodiment viewed from above. FIG. 2 is a view showing the stacked state of the trays of the comparative example. FIG. 3 is a plan view of the sheet material of the first embodiment.

[0011] As shown in FIG. 1, the tray (storage box) 1 is formed so that it can be stacked vertically while accommodating contents such as fresh fruits. The bottom wall 11 of the tray 1 is formed in a rectangular shape in a top view having outer edges along the front-rear direction (second direction) and the left-right direction (first direction). A pair of long walls (first side walls) 12 are positioned at both end edges in the left-right direction of the bottom wall 11, and a pair of short walls (second side walls) 13 are positioned at both end edges in the front-rear direction of the bottom wall 11. Also, a pair of crosspieces 14 extend from the upper edges of the pair of short walls 13 so as to cover the pair of long walls 12, and placement surfaces are formed on both front and rear sides of the tray 1 by the pair of crosspieces 14.

[0012] The pair of long walls 12 are formed in a double structure with a pair of outer walls 15 and a pair of inner walls 16 facing each other. The pair of outer walls 15 rise from both left and right edges of the bottom wall 11 in the lateral direction, and the pair of inner walls 16 are folded downward at an interval from the upper edges of the pair of outer walls 15, so that a pair of narrow upper surface portions 17 are formed between the pair of outer walls 15 and the pair of inner walls 16. A pair of crosspieces 14 are covered on both front and rear ends of the pair of upper surface portions 17 in the longitudinal direction, and the middle portions of the pair of upper surface portions 17 are exposed from the pair of crosspieces 14. Four inverted V-shaped protrusions 23 protrude from the middle portions of the pair of upper surface portions 17, and the upper and lower trays 1 are positioned by the four protrusions 23.

[0013] Both left and right ends of the pair of crosspieces 14 protrude inward in the longitudinal direction, and both ends of the pair of upper surface portions 17 are located below both ends of the pair of crosspieces 14. A pair of connecting holes 24 are formed at both ends of each upper surface portion 17 in the lateral direction, and a pair of connecting pieces 25 are provided at the tip sides of both edges of each crosspiece 14. The connecting pieces 25 of the crosspieces 14 are inserted into the connecting holes 24 of the upper surface portions 17 at the four corners of the tray 1, and the pair of long walls 12 and the pair of short walls 13 are connected via the pair of crosspieces 14. Four sandwiching pieces 18 enter between the pair of outer walls 15 and the pair of inner walls 16 from both left and right edges of the pair of short walls 13, and four folding pieces 19 are positioned inside the pair of short walls 13 from both front and rear edges of the pair of long walls 12.

[0014] By the way, as shown in FIG. 2, in the tray 135 of the comparative example, a pair of crosspieces 138 are covered on the upper surface portion 137 of the pair of outer walls 136, and steps are formed at the four corners of the tray 135 by the upper surface portion 137 and the crosspieces 138. Therefore, when a plurality of trays 135 are stacked, the gap between the upper and lower trays 135 becomes large, and a sufficient stacking function cannot be obtained unless the protrusions 139 protruding from the upper surface portion 137 are made higher. Thus, in the present embodiment, at the ends of the pair of long walls 12 on which the pair of crosspieces 14 are covered, the inner side is made lower than the outer side of the pair of upper surface portions 17, and the pair of crosspieces 14 are sunk into the pair of upper surface portions 17 to reduce the steps at the four corners of the tray 1 (see FIG. 7).

[0015] As shown in FIG. 3, the tray 1 is formed into a box shape by assembling a flat sheet material 5. The sheet material 5 is formed by cutting out a single paper 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. Note that FIG. 3 shows the cardboard sheet as viewed from the front liner side. Here, the direction in which the step top of the core 6 of the cardboard sheet extends 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" for explanation. The step direction X of the sheet material 5 is aligned with the left-right direction, and the flow direction Y of the sheet material 5 is aligned with the front-rear direction.

[0016] At the center of the sheet material 5, a rectangular bottom wall 11 is provided with the step direction X as the short side and the flow direction Y as the long side. Four latching holes 26 are formed along the pair of long sides of the bottom wall 11. Outside the bottom wall 11 in the step direction X, a pair of substantially rectangular outer walls 15 are connected via a fold line L1. Outside the pair of outer walls 15 in the step direction X, a pair of upper surface portions 17 are connected via fold lines L2 and L3. Outside the pair of upper surface portions 17 in the step direction X, a pair of inner walls 16 are connected via fold lines L4 and L5. Outside the pair of inner walls 16 in the flow direction Y, four folded-back pieces 19 are connected via a reverse fold line L6.

[0017] Further, cut lines C1 and C2 that divide the fold lines L2 and L4 are provided in the step direction X at four positions corresponding to the four latching holes 26 in the pair of outer walls 15, the pair of upper surface portions 17, and the pair of inner walls 16. Fold lines L7 - L9 are provided between the cut lines C1 and C2. The fold lines L7 and L9 are slightly inclined so as to go from the outside to the inside in the flow direction Y and toward the outside in the step direction X, and the fold line L8 is slightly inclined so as to go from the outside to the inside in the flow direction Y and toward the inside in the step direction X. The cut lines C1 and C2 and the fold lines L7 - L9 form an inverted V-shaped protrusion 23 (see FIG. 1) that enters the latching hole 26 when the trays 1 are stacked.

[0018] On a pair of outer walls 15 and a pair of upper surface portions 17, pentagonal connecting holes 24 are formed between a pair of broken lines L2 and L3 and between a pair of broken lines L4 and L5. A cut 28 extends between the broken lines L2 and L4 from the opening edge of each connecting hole 24, and a connecting piece 25 inserted into the connecting hole 24 is clamped by the cut 28. Four latching pieces 27 corresponding to four latching holes 26 are provided at the outer edges of the pair of inner walls 16 in the step direction X. By latching the four latching pieces 27 of the pair of inner walls 16 to the four latching holes 26 of the bottom wall 11, a pair of long walls 12 having a double structure with four protrusions 23 (FIG. 1) protruding upward from the upper surface portion 17 are assembled.

[0019] At this time, the distance D2 between the broken lines L1 and L3 is formed larger than the distance D1 between the broken lines L1 and L2, and the distance D4 between the broken line L5 and the edge of the inner wall 16 is formed smaller than the distance D3 between the broken line L4 and the edge of the inner wall 16. Also, when the long wall 12 is assembled, the distances D1 and D3 are adjusted to dimensions such that the upper surface portion 17 becomes horizontal. For this reason, when the long wall 12 is assembled, the outer walls 15 at both ends of the long wall 12 are higher than the outer wall 15 at the middle portion of the long wall 12, and the inner walls 16 at both ends of the long wall 12 are lower than the inner wall 16 at the middle portion of the long wall 12, and the upper surface portion 17 inclines so as to be lower from the outside to the inside at both ends of the long wall 12 (see FIG. 7).

[0020] A pair of substantially rectangular short walls 13 are connected via a broken line L10 to the outside of the bottom wall 11 in the flow direction Y. Four sandwiching pieces 18 are connected via a broken line L11 to the outside of the pair of short walls 13 in the step direction X. A pair of crossbars 14 are connected via a broken line L12 to the outside of the pair of short walls 13 in the flow direction Y. Both ends of each crossbar 14 in the step direction X protrude to the outside in the flow direction Y, and a pair of connecting pieces 25 are connected to both ends of each crossbar 14 via a broken line L13. The base end portions of the respective connecting pieces 25 are partially cut out, and when the tray 1 is assembled, the connecting pieces 25 are latched to the opening edges of the respective connecting holes 24 by the cutouts 29.

[0021] Both end edges 20 in the step direction X of each crossbar 14 are cut from the boundary position with the connecting piece 25 to the broken line L13, and each connecting piece 25 is formed to be bendable starting from the inside in the step direction X of both end edges 20 in the step direction X of each crossbar 14. Both end edges 20 in the step direction X of each crossbar 14 protrude outside in the step direction X from the base ends (broken line L13) of the pair of connecting pieces 25, and the contact surfaces of each crossbar 14 with the pair of long walls 12 become wider, and each crossbar 14 is stably supported by the pair of long walls 12. Also, when each crossbar 14 is covered by the pair of long walls 12 due to the bending of both end edges 20 in the step direction X of each crossbar 14, the crossbar 14 is likely to sink in.

[0022] In addition, in FIG. 3, the broken lines L1-L5, L7-L13 shown by the dashed lines are the creases formed by linearly crushing the corrugated cardboard sheet from the back liner side. Also, the reverse crease L6 shown by the two-dot chain line is the crease formed by linearly crushing the corrugated cardboard sheet from the front liner side. The broken lines L1-L5, L7-L13 and the reverse crease L6 may be formed in any way as long as the corrugated cardboard sheet is bendable. For example, a part or all of the broken lines L1-L5, L7-L13 and the reverse crease L6 may be formed by a lead crease in which a plurality of cuts are intermittently formed on the ruled line.

[0023] Referring to FIGS. 4 to 6, the assembly work of the tray according to the first embodiment will be described. FIGS. 4 to 6 are diagrams showing an example of the assembly work of the tray according to the first embodiment. The tray may be assembled manually by an operator or automatically or semi-automatically by a box-making machine. Here, as an example, the case where an operator assembles the tray will be described, but the working order of the assembly work can be changed as appropriate.

[0024] As shown in Fig. 4, the back liner of the sheet material 5 (see Fig. 3) is directed upward. First, a pair of short walls 13 are folded upward along the broken line L10, and a pair of short walls 13 are raised with respect to the bottom wall 11. Four clamping pieces 18 are folded inward along the broken line L11, and the four clamping pieces 18 are directed in the front-rear direction along the long side of the bottom wall 11. Next, a pair of outer walls 15 are folded upward along the broken line L1, and a pair of outer walls 15 are raised with respect to the bottom wall 11 so as to be in contact with the four clamping pieces 18 from the outside in the left-right direction. Below the four connecting holes 24, the tip portions of the four clamping pieces 18 are formed low.

[0025] As shown in Fig. 5, four folding pieces 19 are folded outward along the reverse broken line L6, and a pair of inner walls 16 and a pair of upper surface portions 17 are folded back along the broken lines L2-L5 (see Fig. 4). Four latching pieces 27 of the pair of inner walls 16 are latched to four latching holes 26 of the bottom wall 11 so as to sandwich the four clamping pieces 18, and a pair of long walls 12 having a double structure are formed. Along with the folding back of the pair of inner walls 16 and the pair of upper surface portions 17, the inside of the cut lines C1 and C2 is folded in an inverted V shape along the broken lines L7-L9 (see Fig. 4) to form four protrusions 23. An outer slope of the protrusion 23 is formed between the broken lines L7 and L8, and an inner slope of the protrusion 23 is formed between the broken lines L8 and L9.

[0026] Also, the four folding pieces 19 are directed in the left-right direction along a pair of short walls 13. The step top of the center 6 (see Fig. 3) of the pair of long walls 12 and the four folding pieces 19 extends in the vertical direction, and the strength of the tray 1 against the compressive load is increased. At the middle part of the pair of long walls 12, there is no height difference between the upper edge (broken line L2) of the pair of outer walls 15 and the upper edge (broken line L4) of the pair of inner walls 16, and a horizontal surface 21 is formed on the upper surface portion 17. On the other hand, at both ends of the pair of long walls 12, the upper edge (broken line L5) of the pair of inner walls 16 is lower than the upper edge (broken line L3) of the pair of outer walls 15, and a slope 22 is formed so that the inside is lower than the outside of the upper surface portion 17.

[0027] As shown in Fig. 6, four connecting pieces 25 are folded inward along the broken line L13 (see Fig. 5), and a pair of crossbars 14 are folded inward along the broken line L12 (see Fig. 5) so as to cover the pair of long walls 12. The four connecting pieces 25 are inserted into the connecting holes 24 of the pair of long walls 12, and the pair of long walls 12 and the pair of short walls 13 are connected via the pair of crossbars 14. At this time, the pair of crossbars 14 sink along the inclined surfaces 22 of the upper surface portions 17 of the pair of long walls 12, and the four connecting pieces 25 are deeply inserted into the four connecting holes 24, so that the height of the entire pair of crossbars 14 is lowered. A part of the lower surface of the pair of crossbars 14 is lower than the upper surface of the middle portion of the pair of long walls 12. Although the sandwiching pieces 18 (see Fig. 4) are located inside the long walls 12, the connecting pieces 25 do not interfere with the lowered tip portions of the sandwiching pieces 18.

[0028] Referring to Fig. 7, the support structure of the crossbar will be described. Fig. 7 is a view showing the stacked state of the trays of the first embodiment. Note that Fig. 7(B) shows a cross section of the tray of Fig. 7(A) cut along line A-A, and Fig. 7(D) shows a cross section of the plurality of trays of Fig. 7(C) cut along line B-B.

[0029] As shown in Figs. 7(A) and 7(B), when the tray 1 is assembled, at the ends of the pair of long walls 12, the inner wall 16 is lower than the outer wall 15, and the inclined surface 22 is formed on the upper surface portion 17. Both end edges 20 of the crossbar 14 are covered on the inclined surfaces 22 of the pair of long walls 12, and by inserting the connecting piece 25 into the connecting hole 24, both end edges 20 of the crossbar 14 are gently pressed against the inclined surfaces 22 of the pair of long walls 12. Both end edges 20 of the crossbar 14 are slightly deformed along the inclined surfaces 22 of the pair of long walls 12, and a part of the lower surface of the crossbar 14 is lower than the upper surface of the middle portion of the long wall 12, so that the step between the crossbar 14 and the pair of long walls 12 is reduced. Further, in the middle portion of the pair of long walls 12, the inverted V-shaped protrusions 23 of the pair of long walls 12 protrude above the crossbar 14.

[0030] As shown in FIGS. 7(C) and 7(D), when another tray 1a is placed on the tray 1, the crossbars 14 are strongly pressed against the inclined surfaces 22 of the pair of long walls 12. Both end edges 20 of the crossbars 14 are greatly deformed along the inclined surfaces 22 of the pair of long walls 12, and the crossbars 14 sink deeply so that the step between the crossbars 14 and the pair of long walls 12 is minimized. By the amount that the crossbars 14 sink, the protruding amount of the protrusions 23 with respect to the crossbars 14 increases, and the protrusions 23 deeply enter the latching holes of the other tray 1a. Therefore, even if the protrusions 23 are formed low, the trays 1 and 1a are properly positioned. Further, the load of the other tray 1a is received over the entire circumference of the tray 1, and the trays 1 and 1a are stacked in a more stable state.

[0031] As described above, according to the first embodiment, since the inner side is formed lower than the outer side of the upper surface portion 17 of the pair of long walls 12 on which the pair of crossbars 14 are covered, when the trays 1 are stacked, the crossbars 14 of the trays 1 are likely to sink. It becomes difficult to create a step between the pair of long walls 12 and the pair of crossbars 14, and the gap between the upper and lower trays 1 becomes small when stacked in multiple stages, and the plurality of trays 1 can be stacked in a stable state.

[0032] <Second Embodiment> With reference to FIGS. 8 and 9, the tray of the second embodiment will be described. FIG. 8 is a perspective view of the tray of the second embodiment. FIG. 9 is a plan view of the sheet material of the second embodiment. The tray of the second embodiment is different from the tray of the first embodiment in that the folding pieces are provided in duplicate. Therefore, regarding the tray of the second embodiment, the description of the same configuration as that of the first embodiment will be omitted as much as possible.

[0033] As shown in Fig. 8, in the tray 31 of the second embodiment, a pair of long walls 42 are located at both left and right ends of the bottom wall 41 in the lateral direction, and a pair of short walls 43 are located at both front and rear ends of the bottom wall 41 in the longitudinal direction. The pair of long walls 42 have a double structure of a pair of outer walls 45 and a pair of inner walls 46, and a narrow upper surface portion 47 is formed between the pair of outer walls 45 and the pair of inner walls 46. A pair of crossbars 44 are placed on both front and rear ends of the pair of upper surface portions 47 in the longitudinal direction, and four inverted V-shaped protrusions 53 protrude from the middle portion of the pair of upper surface portions 47. A pair of connecting pieces 55 of each crossbar 44 are inserted into the connecting holes 54 of the pair of upper surface portions 47, and the pair of long walls 42 and the pair of short walls 43 are connected.

[0034] Also in the second embodiment, a pair of crossbars 44 are placed on both front and rear ends of the pair of long walls 42, and slopes (not shown) are formed at both ends of the pair of long walls 42 in the longitudinal direction such that the inner side is lower than the outer side. By the pair of crossbars 44 sinking along the slopes of the pair of long walls 42, the overall height of the pair of crossbars 44 is reduced. In addition, a first and a second folding piece 48, 49 are positioned inside the pair of short walls 43, and the pair of crossbars 44 are supported from below by the double folding pieces. The center cores 36 (see Fig. 9) of the pair of long walls 42 and the first and second folding pieces 48, 49 extend in the vertical direction, and the strength of the tray 31 against compressive loads is increased.

[0035] As shown in Fig. 9, the sheet material 35 is formed by connecting the bottom wall 41, the outer walls 45, the inner walls 46, the upper surface portion 47, the first and second folding pieces 48, 49, the short walls 43, the crossbars 44, and the connecting pieces 55 via the fold lines L21 - L26, L28 - L33, and the reverse fold line L27. In addition, latching holes 56, connecting holes 54, and cut lines C3, C4 are formed in the sheet material 35. In the second embodiment, a pair of first folding pieces 48 are connected via the fold line L26 to the outside of each outer wall 45 in the flow direction Y, and a pair of second folding pieces 49 are connected via the reverse fold line L27 to the outside of each inner wall 46 in the flow direction Y. The tray 31 is assembled by folding this sheet material 35 along each fold line.

[0036] As described above, also in the second embodiment, similar to the first embodiment, a plurality of trays 31 can be stacked in a stable state. Further, the strength of the tray is increased by the first and second folding pieces 48 and 49.

[0037] <Third Embodiment> With reference to FIGS. 10 and 11, the tray of the third embodiment will be described. FIG. 10 is a perspective view of the tray of the third embodiment. FIG. 11 is a plan view of the sheet material of the third embodiment. Note that the tray of the third embodiment is different from the tray of the first embodiment in that positioning protrusions are provided at the four corners. Therefore, regarding the tray of the third embodiment, the description of the same configuration as that of the first embodiment will be omitted as much as possible.

[0038] As shown in FIG. 10, in the tray 61 of the third embodiment, a pair of long walls 72 are located at both left and right edges in the lateral direction of the bottom wall 71, and a pair of short walls 73 are located at both front and rear edges in the longitudinal direction of the bottom wall 71. The pair of long walls 72 have a double structure of a pair of outer walls 75 and a pair of inner walls 76, and a narrow upper surface portion 77 is formed between the pair of outer walls 75 and the pair of inner walls 76. A pair of crosspieces 74 are covered on both front and rear ends in the longitudinal direction of the pair of upper surface portions 77, and L-shaped protrusions 83 protrude from the four corners of the tray 61 in plan view. Four sandwiching pieces 78 (see FIG. 11) enter between the pair of outer walls 75 and the pair of inner walls 76, and four folding pieces 79 are positioned inside the pair of short walls 73.

[0039] A pair of connecting pieces 85 of each crosspiece 74 are inserted into connecting holes 84 of the pair of upper surface portions 77, and the pair of long walls 72 and the pair of short walls 73 are connected. Also in the third embodiment, a pair of crosspieces 74 are covered on both front and rear ends in the longitudinal direction of the pair of long walls 72, and slopes (not shown) are formed at both ends of the pair of long walls 72 such that the inner side is lower than the outer side. The height of the entire pair of crosspieces 74 is lowered by the pair of crosspieces 74 sinking along the slopes of the pair of long walls 72. Depressions 86 are formed at the four corners of the bottom wall 71, and the protrusions 83 of the lower tray 61 fit into the depressions 86 of the upper tray 61, so that the upper and lower trays 61 are positioned in the front-rear and left-right directions.

[0040] As shown in FIG. 11, the sheet material 65 is formed by connecting the bottom wall 71, the outer wall 75, the inner wall 76, the upper surface portion 77, the folded-back piece 79, the short wall 73, the sandwiching piece 78, the crossbar 74, and the connecting piece 85 via the fold lines L41 - L45, L47 - L50, and the reverse fold line L46. A connecting hole 84 is formed in the sheet material 65. In the third embodiment, the four corners of the bottom wall 71 are cut out in a substantially L - shaped in plan view. Further, a cut line C5 in an L - shape in plan view enters the outside in the step direction X of the fold line L49, and the outside in the flow direction Y of the sandwiching piece 78 is cut out in a stepped shape so as to form a convex shape together with this cut line C5. The tray 61 is assembled by folding the sheet material 65 along each fold line.

[0041] As described above, also in the third embodiment, similar to the first embodiment, a plurality of trays 61 can be stacked in a stable state. Further, the protrusion 83 of the lower tray 61 fits into the recess 86 of the upper tray 61, and the upper and lower trays 61 are positioned in the front - rear, left - right directions.

[0042] <The Fourth Embodiment> Referring to FIGS. 12 and 13, the packaging box of the fourth embodiment will be described. FIG. 12 is a perspective view of the packaging box of the fourth embodiment. FIG. 13 is a plan view of the sheet material of the fourth embodiment. The packaging box of the fourth embodiment is different from the tray of the first embodiment in that the crossbar is provided only on the front side, which is a packaging box with a lid. Therefore, regarding the packaging box of the fourth embodiment, the description of the same configuration as the first embodiment will be omitted as much as possible.

[0043] As shown in FIG. 12, in the packaging box (storage box) 91 of the fourth embodiment, a pair of side walls (first side walls) 102 are located at both end edges in the left - right direction of the bottom wall 101, and a front wall (second side wall) 103 and a rear wall 104 are located at both end edges in the front - rear direction of the bottom wall 101. The pair of side walls 102 has a double - structure of a pair of outer side walls 106 and a pair of inner side walls 107, and a narrow upper surface portion 108 is formed between the pair of outer side walls 106 and the pair of inner side walls 107. The front wall 103 has a double - structure of an outer front wall 111 and an inner front wall 112 (see FIG. 13), and the crosspiece 105 continuous with the upper edge of the front wall 103 also has a double - structure of an outer crosspiece 113 and an inner crosspiece 114 (see FIG. 13). A pair of connecting pieces 125 (see FIG. 13) of the crosspiece 105 are inserted into connecting holes 124 (see FIG. 13) of the pair of upper surface portions 108, and the crosspiece 105 is placed on the front end portions of the pair of side walls 102.

[0044] Also in the third embodiment, at the front end portions of the pair of side walls 102, the inner side is formed lower than the outer side, and the height of the entire pair of crosspieces 105 is lowered. A cover plate 115 is swingably continuous with the upper edge of the rear wall 104, and when the cover plate 115 is swung in the closing direction, the top - surface opening of the packaging box 91 is closed. A plug - in piece 129 bent in the closing direction with respect to the cover plate 115 is provided at the tip of the cover plate 115, and a plug - in port 128 into which the plug - in piece 129 is inserted is formed in the front wall 103. A pair of front clamping pieces 116 (see FIG. 13) enter between the pair of outer side walls 106 and the pair of inner side walls 107 from both end edges in the left - right direction of the front wall 103, and a pair of rear clamping pieces 117 (see FIG. 13) enter between the pair of outer side walls 106 and the pair of inner side walls 107 from both end edges in the left - right direction of the rear wall 104.

[0045] As shown in FIG. 13, a rectangular bottom wall 101 is provided at the center of the sheet material 95, with the step direction X as the long side and the flow direction Y as the short side. Four latching holes 126 are formed in the bottom wall 101 along a pair of short sides. A pair of substantially rectangular outer walls 106 are connected via a broken line L61 outside the bottom wall 101 in the step direction X. A pair of upper surface portions 108 are connected via a broken line L62 outside the pair of outer walls 106 in the step direction X. A pair of inner walls 107 are connected via broken lines L63 and L64 outside the pair of upper surface portions 108 in the step direction X. Connection holes 124 are formed in the pair of upper surface portions 108, and four latching pieces 127 are provided at the outer edges of the pair of inner walls 107 in the step direction X.

[0046] On one side (front side) of the bottom wall 101 in the flow direction Y, a substantially rectangular outer front wall 111 is connected via a broken line L65. A pair of front clamping pieces 116 are connected via a broken line L66 outside the outer front wall 111 in the step direction X. An outer crosspiece 113 is connected via a broken line L67 on one side of the outer front wall 111 in the flow direction Y, and an insertion port 128 is formed between the outer front wall 111 and the outer crosspiece 113. An inner crosspiece 114 is connected via a broken line L68 on one side of the outer crosspiece 113 in the flow direction Y. A pair of connecting pieces 125 are connected via a reverse broken line L69 outside the inner crosspiece 114 in the step direction X. An inner front wall 112 is connected via a reverse broken line L70 outside the inner crosspiece 114 in the flow direction Y, and an opening 131 is formed between the inner front wall 112 and the inner crosspiece 114.

[0047] On the other side (rear side) of the bottom wall 101 in the flow direction Y, a substantially rectangular rear wall 104 is connected via a broken line L71. On the outer side of the rear wall 104 in the step direction X, a pair of rear clamping pieces 117 are connected via a broken line L72. On the other side of the rear wall 104 in the flow direction Y, a cover plate 115 is connected via a broken line L73. On the other side of the cover plate 115 in the flow direction Y, an insertion piece 129 is connected via a broken line L74. By folding this sheet material 95 along each broken line, the packaging box 91 with a lid is assembled. For example, the pair of inner side walls 107 and the pair of upper surface portions 108 are folded back along the broken lines L62 - L64 to form a pair of double - structure side walls 102 (see FIG. 12). A pair of connection holes 124 are opened in the upper surface portions 108 of the pair of side walls 102.

[0048] Also, after the inner crosspiece 114 is folded back along the broken line L68, the inner crosspiece 114 and the outer crosspiece 113 are overlapped and then folded back along the broken lines 67 and the reverse broken line L70, and a pair of connection pieces 125 are inserted into the connection holes 124 of the pair of side walls 102. Thereby, a front wall 103 with a double - structure of the outer front wall 111 and the inner front wall 112 is formed, and a crosspiece 105 with a double - structure of the outer crosspiece 113 and the inner crosspiece 114 is formed. At the front end portions of the pair of side walls 102, the upper surface portions 108 incline downward from the outside to the inside, and the crosspiece 105 is pressed against this inclined upper surface portion 108. When the insertion piece 129 of the cover plate 115 is inserted into the insertion port 128 of the front wall 103, the crosspiece 105 pushed into the cover plate 115 sinks deeply, and the gap of the cover plate 115 is minimized.

[0049] As described above, also in the fourth embodiment, similar to the first embodiment, a plurality of packaging boxes 91 can be stacked in a stable state. Further, even if the packaging box 91 is provided with the crosspiece 105, the cover plate 115 can be closed without a gap.

[0050] In the above - mentioned first to third embodiments, a tray is exemplified as the storage box. In the above - mentioned fourth embodiment, a packaging box is exemplified as the storage box. However, the storage box only needs to be formed so as to be able to accommodate the contents.

[0051] In addition, in the first to third embodiments described above, positioning projections are formed on the tray, but the projections may not be formed on the tray.

[0052] In addition, in the first to third embodiments described above, the long wall is formed in a double structure and the crossbars are provided on the short wall, but the short wall may be formed in a double structure and the crossbars may be provided on the long wall.

[0053] In addition, in each of the above embodiments, the tray is formed of a double-sided corrugated sheet, but the tray may be formed of a single-sided corrugated sheet, a double-sided corrugated sheet, cardboard, a resin plate material, or the like.

[0054] As described above, the first aspect is a storage box (trays 1, 31, 61, packaging box 91) that can be stacked vertically with the contents stored therein, and includes a bottom wall (11, 41, 71, 101) having an outer edge along intersecting first and second directions, a first side wall (long walls 12, 42, 72, side wall 102) of a double structure positioned at both end edges of the bottom wall in the first direction, a second side wall (short walls 13, 43, 73, front wall 103) positioned at at least one end edge of the bottom wall in the second direction, and a crossbar (14, 44, 74, 105) extending from the upper edge of the second side wall so as to cover the first side wall. At the end of the first side wall where the crossbar is covered, the inner side is formed lower than the outer side of the upper surface (upper surface portions 17, 47, 77, 108) of the first side wall, and a part of the lower surface of the crossbar is lower than the upper surface of the middle portion of the first side wall exposed from the crossbar. According to this configuration, since the inner side is formed lower than the outer side of the upper surface of the first side wall where the crossbar is covered, when a plurality of storage boxes are stacked, the crossbar of the lower storage box is likely to sink under the load of the upper storage box. It becomes difficult to create a step between the upper surface of the first side wall and the crossbar, and when stacked in multiple layers, the gap between the upper and lower storage boxes becomes small, and a plurality of storage boxes can be stacked in a stable state.

[0055] In the second aspect, in the first aspect, at the middle part of the first side wall exposed from the crossbar, the upper surface of the first side wall is formed horizontally. According to this configuration, the load of the upper storage box is received over the entire circumference of the lower storage box, and the storage boxes can be stacked in a more stable state.

[0056] In the third aspect, in the first aspect or the second aspect, the outer wall at the end of the first side wall is higher than the outer wall at the middle part of the first side wall, and the inner wall at the end of the first side wall is lower than the inner wall at the middle part of the first side wall. According to this configuration, the outer wall at the end of the first outer wall can be made higher than the outer wall at the middle part, and the inner wall on the end side of the first outer wall can be made lower than the outer wall at the middle part, so that a height difference can be created between the outer side and the inner side of the upper surface on the end side of the first outer wall.

[0057] In the fourth aspect, in any one of the first aspect to the third aspect, a plurality of protrusions (23, 53) protrude upward from the middle part of the first side wall exposed from the crossbar. According to this configuration, as the crossbar sinks, the protrusion amount of each protrusion with respect to the crossbar increases. Therefore, even if the plurality of protrusions are formed low, the upper storage box can be positioned.

[0058] In the fifth aspect, in any one of the first aspect to the fourth aspect, connection holes (24, 54, 84, 124) are formed at the ends of the first side wall, and connection pieces (25, 55, 85, 125) that are inserted into the connection holes are provided on the crossbar. According to this configuration, as the crossbar becomes more likely to sink, the connection pieces are inserted deeper into the connection holes, and the height of the entire crossbar can be reduced.

[0059] In the sixth aspect, in the fifth aspect, the connection pieces are bent starting from the inner side in the first direction of both end edges (20) of the crossbar in the first direction. According to this configuration, the crossbar and both end edges in the first direction protrude outside the first direction from the base ends of the connection pieces, the contact surface between the crossbar and the first side wall becomes wider, and the crossbar is stably supported by the first side wall. Also, since both end edges of the crossbar in the first direction are bent, the crossbar is more likely to sink when the crossbar is covered by the first side wall.

[0060] The seventh aspect is a sheet material (5, 35, 65, 95) formed so as to be able to assemble the storage box according to any one of the first to sixth aspects. According to this configuration, a storage box that can be stacked in a stable state can be assembled from the sheet material.

[0061] Although the present embodiment has been described, as another embodiment, a combination of all or part of the above embodiment and the modification examples may be used.

[0062] In addition, the technology of the present invention is not limited to the above embodiments, and various changes, substitutions, and modifications may be made without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in another way by the progress of technology or another derived technology, that method may be used for implementation. Therefore, the scope of the utility model registration claims covers all embodiments that can be included within the scope of the technical idea.

Explanation of Reference Numerals

[0063] 1, 31, 61: Tray (storage box) 5, 35, 65, 95: Sheet material 11, 41, 71, 101: Bottom wall 12, 42, 72: Long wall (first side wall) 13, 43, 73: Short wall (second side wall) 14, 44, 74, 105: Crossbar 20: Both end edges 17, 47, 77, 108: Upper surface part (upper surface of the first side wall) 23, 53: Projection 24, 54, 84, 124: Connecting hole 25, 55, 85, 125: Connecting piece 91: Packaging box (storage box) 102: Side wall (first side wall) 103: Front wall (second side wall)

Claims

1. A storage box (1, 31, 61, 91) that can be stacked vertically with contents stored therein, comprising: a bottom wall (11, 41, 71, 101) having outer edges along intersecting first and second directions; first side walls (12, 42, 72, 102) of a double structure positioned at both end edges of the bottom wall in the first direction; a second side wall (13, 43, 73, 103) positioned at at least one end edge of the bottom wall in the second direction; and a crossbar (14, 44, 74, 105) extending from the upper edge of the second side wall to cover the first side wall. At the end of the first side wall where the crossbar is covered, the inner side is formed lower than the outer side of the upper surface (17, 47, 77, 108) of the first side wall. A storage box, characterized in that a part of the lower surface of the crossbar is lower than the upper surface of the middle part of the first side wall exposed from the crossbar.

2. The storage box according to claim 1, characterized in that the upper surface of the middle part of the first side wall exposed from the crossbar is formed horizontally.

3. The storage box according to claim 1, characterized in that the outer wall of the end of the first side wall is higher than the outer wall of the middle part of the first side wall, and the inner wall of the end of the first side wall is formed lower than the inner wall of the middle part of the first side wall.

4. The storage box according to claim 1, characterized in that a plurality of protrusions (24, 53) protrude upward from the middle part of the first side wall exposed from the crossbar.

5. The storage box according to claim 1, characterized in that connection holes (24, 54, 84, 124) are formed at the ends of the first side wall, and connection pieces (25, 55, 85, 125) inserted into the connection holes are provided on the crossbar.

6. The storage box according to claim 5, characterized in that the connection piece is bent starting from the inner side in the first direction rather than the both end edges (20) in the first direction of the crossbar.

7. A sheet material, characterized in that it is formed so that the storage box according to any one of claims 1 to 6 can be assembled.

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