container

Abstract

To provide a container that can improve stability when stacked and prevent the stacked containers from collapsing.SOLUTION: A container (tray 1) includes: first side plates 10; second side plates 11; push-in parts 20 each defined by a first folding line 21 and a second folding line 22; first positioning projection parts 25 projecting from the first side plates 10; and second positioning projection part 26 projecting upward from the second side plates 11. By pushing the push-in part 20 inward so that a part 13b located in the push-in part 20 of a mountain-fold part 13 between the first side plate 10 and the second side plate 11 is valley-folded, the first side plate 10 is mountain-folded along the first folding line 21, and the second side plate 11 is mountain-folded along the second folding line 22, a part other than the push-in part 20 and a part above a lower end of the push-in part 20 can be inclined outward from a lower side to an upper side, of the first side plate 10 including the first positioning projection part 25 and the second side plate 11 including the second positioning projection part 26.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Patent Document 1 discloses a packaging box having a push-in section defined by a pair of fold lines at each of the upper four corners of an outer wall consisting of four side panels. In this packaging box, the inner and outer flaps constituting the top cover are separated from the side panels, and then the push-in section is pushed into the inner side of the outer wall. This makes it possible to place another packaging box on the push-in section protruding into the outer wall, improving stability when multiple packaging boxes are stacked. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6524141 Summary of the Invention [Problem to be solved by the invention]

[0004] When the packaging boxes of Patent Document 1 are stacked, the upper packaging box can move laterally relative to the lower packaging box, so there is a possibility that the load may collapse when an external force is applied. Therefore, there is room for improvement in the stability of the packaging boxes of Patent Document 1 when stacked.

[0005] An object of the present invention is to provide a container that can improve stability when stacked and prevent the load from collapsing. [Means for solving the problem]

[0006] The present invention provides a lidar comprising a first side plate extending in a height direction and a width direction intersecting the height direction, and a second side plate connected to one end of the first side plate in the width direction via a mountain fold and extending in the height direction and a length direction intersecting both the height direction and the width direction. Equipped with , a pair of the first side plates are provided at an interval in the longitudinal direction, a pair of the second side plates are provided at an interval in the width direction, a pair of the first side plates and a pair of the second side plates form a rectangular cylindrical outer wall, a lower end of the outer wall is closed by a bottom wall, and an upper end of the outer wall is open;a push-in portion defined by a first fold line provided on the mountain fold side of the first side plate and inclined upward from the mountain fold side toward the center in the width direction, and a second fold line provided on the mountain fold side of the second side plate and inclined upward from the mountain fold side toward the center in the length direction; a first positioning protrusion protruding upward from the first side plate and having a first upper edge extending in the width direction above an upper end of the mountain fold, the end of the first upper edge on the mountain fold side being located closer to the center in the width direction than an upper end of the first fold line; and a second positioning protrusion, an end of the second upper edge facing the mountain fold being located toward the center in the longitudinal direction relative to the upper end of the second fold line, wherein by pressing the pushing portion inward such that a portion of the mountain fold located within the pushing portion becomes a valley fold, the first side panel makes a mountain fold along the first fold line and the second side panel makes a mountain fold along the second fold line, and wherein portions of the first side panel including the first positioning protrusion and the second side panel including the second positioning protrusion other than the pushing portion and above the lower end of the pushing portion are each tiltable outward from the bottom to the top.

[0007] In this embodiment, a first positioning protrusion is provided at an upper end of the first side plate, and a second positioning protrusion is provided at an upper end of the second side plate. Also, by pressing the pressing portion inward, the first side plate including the first positioning protrusion and the second side plate including the second positioning protrusion can be inclined to widen upwards, except for the pressing portion, and the portion above the pressing portion.

[0008] Due to the inclination of the first and second side plates, the outer shape of the opening defined by the first upper edge of the first positioning protrusion and the second upper edge of the second positioning protrusion is larger than the outer shape of the bottom defined by the lower end of the first and second side plates. This makes it easy to position the bottom of the upper container inside the opening of the lower container, improving workability when stacking.

[0009] When the containers are stacked, the bottom of the upper container rests on the push-in portion of the lower container. The first positioning protrusion of the lower container is located on the outside of the first side plate of the upper container, and the second positioning protrusion of the lower container is located on the outside of the second side plate of the upper container. The first positioning protrusion and the second positioning protrusion restrict lateral movement of the upper container relative to the lower container. This improves stability in the stacked state and prevents the load from collapsing when an external force is applied. Effect of the Invention

[0010] The container of the present invention can improve stability when stacked, and can prevent the load from collapsing. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a container according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the container of FIG. 1 as seen from below. [Diagram 3] FIG. 2 is a perspective view of the container in FIG. 1 in a pushed-in state. [Figure 4] FIG. 2 is a plan view of a blank for the container of FIG. 1; [Diagram 5] An enlarged view of part V in Figure 4. [Figure 6] An enlarged view of part VI in Figure 4. [Figure 7A] 13 is a plan view showing the state of the outer peripheral wall before the pushing portion is pushed in. FIG. [Figure 7B] FIG. 13 is a plan view showing the state of the outer peripheral wall with the pressing portion pressed into it. [Figure 8] FIG. [Figure 9] Front view of Figure 8. [Figure 10] FIG. 11 is a plan view showing a portion of a container blank according to a second embodiment. [Figure 11] FIG. 11 is a plan view showing a portion of a container blank according to a third embodiment. [Figure 12] FIG. 13 is a plan view showing a portion of a container blank according to a fourth embodiment. [Figure 13] FIG. 13 is a plan view showing a portion of a container blank according to a fifth embodiment. [Figure 14] FIG. 13 is a plan view showing a portion of a container blank according to a sixth embodiment. [Figure 15] FIG. 13 is a plan view showing a portion of a container blank according to a seventh embodiment. [Figure 16] FIG. 4 is a perspective view of a container according to a first modified example of the present invention. [Figure 17] FIG. 17 is a plan view of a blank for the container of FIG. 16; [Figure 18] FIG. 11 is a perspective view of a container according to a second modified example of the present invention. [Figure 19] FIG. 19 is a plan view of a blank for the container of FIG. 18. [Figure 20] FIG. 11 is a perspective view of a container according to a third modified example of the present invention. [Figure 21] FIG. 21 is a plan view of a blank for the container of FIG. 20; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] (First embodiment) 1 and 2 show a tray 1, which is an example of a container according to a first embodiment of the present invention. The tray 1 comprises a cylindrical outer peripheral wall 2 and a bottom wall 3 that closes the lower end of the outer peripheral wall 2, and the upper end of the outer peripheral wall 2 forms an open opening 4. No lid is provided on the upper end of the outer peripheral wall 2 to close the opening 4.

[0014] 1 and 3, the four upper corners of the outer peripheral wall 2 are provided with push-in portions 20 that can be pushed into the outer peripheral wall 2. A pair of first side plates 10 constituting the outer peripheral wall 2 are each provided with a first positioning protrusion 25, and a pair of second side plates 11 constituting the outer peripheral wall 2 are each provided with a second positioning protrusion 26. In this embodiment, the push-in portions 20 and the positioning protrusions 25, 26 improve the workability when stacking the trays 1 and the stability when multiple trays 1 are stacked.

[0015] The tray 1 of this embodiment will be specifically described below.

[0016] The tray 1 is formed by folding and bonding a blank shown in FIG. 4 at predetermined positions. The blank is formed by punching a cardboard sheet using a well-known paper container punching device. The cardboard sheet has a front liner (the outer surface of the tray 1), a back liner (the inner surface of the tray 1) positioned parallel to the front liner, and a wavy core placed between the front liner and the back liner. The part shown by the dashed dotted line in FIG. 4 is a general-purpose crease formed by scribing from the back liner to compress the thickness. The part shown by the solid line in FIG. 4 is a cutting line formed by cutting with a blade from the back liner to the front liner, and a shape line (side) formed by punching.

[0017] 1 and 2, the X direction is the width direction of the tray 1, the Y direction perpendicular to the X direction is the length direction of the tray 1, and the Z direction perpendicular to both the X and Y directions is the height direction of the tray 1. In the tray 1 of this embodiment, the dimension in the width direction X is shorter than the dimension in the length direction Y, and the dimension in the height direction Z is shorter than both the dimensions in the width direction X and the length direction Y, but these dimensions can be changed as necessary.

[0018] 1 and 2, the outer peripheral wall 2 includes a pair of first side plates 10 spaced apart in the longitudinal direction Y, and a pair of second side plates 11 spaced apart in the width direction X. The first side plate 10 is rectangular and extends along the XZ plane. The second side plate 11 is rectangular and extends along the YZ plane.

[0019] In the following description, of the pair of first side plates 10, one first side plate may be referred to as 10A, and the other first side plate may be referred to as 10B. Also, of the pair of second side plates 11, one second side plate may be referred to as 11A, and the other second side plate may be referred to as 11B.

[0020] 1 is connected to the second side plate 11A via a bent portion (mountain fold) 13, and the other end in the width direction X of the first side plate 10A is connected to the second side plate 11B via an attachment portion 12 and a bent portion (mountain fold) 13. One end in the width direction X of the first side plate 10B located at the lower side in FIG. 1 is connected to the second side plate 11A via a bent portion (mountain fold) 13, and the other end in the width direction X of the first side plate 10B is connected to the second side plate 11B via the bent portion (mountain fold) 13.

[0021] Referring to the blank in Fig. 4, the first side plate 10A, the second side plate 11A, the first side plate 10B, the second side plate 11B, and the attachment portion 12 are connected in one direction in this order via a folding line 13' consisting of a general-purpose crease. For example, a vinyl acetate emulsion adhesive is used to fix the attachment portion 12 located at one end to the first side plate 10A located at the other end. This forms the integrated rectangular cylindrical outer wall 2 shown in Figs. 1 and 2.

[0022] The above-mentioned folded portion 13 is formed by folding the blank along the fold line 13'. In this embodiment, the fold line 13' extends from the lower end to the upper end of the side plates 10, 11, but as long as the fold line 13 can be formed, the upper end of the fold line 13' may be positioned with a gap between it and the upper ends of the side plates 10, 11, or the lower end of the fold line 13' may be positioned with a gap between it and the lower ends of the side plates 10, 11.

[0023] 1 and 2, the bottom wall 3 includes a pair of inner flaps 15 and a pair of outer flaps 16, and closes the lower end of the outer peripheral wall 2. Both the inner flaps 15 and the outer flaps 16 are rectangular and extend along the XY plane.

[0024] The pair of inner flaps 15 are connected to the lower ends of the pair of first side plates 10 via bent portions 17. Each inner flap 15 is bent inwardly with respect to the corresponding first side plate 10. The tips of the pair of inner flaps 15 are positioned with a gap between them.

[0025] The pair of outer flaps 16 are connected to the lower ends of the pair of second side plates 11 via bent portions 17. Each outer flap 16 is bent inwardly with respect to the corresponding second side plate 11 and overlapped on the outer surfaces of the pair of inner flaps 15. The tips of the pair of outer flaps 16 butt against each other.

[0026] For example, by attaching an adhesive tape (not shown) across the tips of the pair of outer flaps 16, the lower end opening of the outer peripheral wall 2 is kept closed by the bottom wall 3.

[0027] 4, the pair of inner flaps 15 are connected to the corresponding first side panel 10 via a fold line 17' formed by a general-purpose crease. The pair of outer flaps 16 are connected to the corresponding second side panel 11 via a fold line 17' formed by a general-purpose crease. The above-mentioned fold portion 17 is formed by folding the blank along the fold line 17'.

[0028] Next, the pushing portion 20, the first positioning protrusion 25, and the second positioning protrusion 26 will be described in detail.

[0029] 1 and 5, the pushing portion 20 is defined by a first fold line 21 provided on the first side plate 10, a second fold line 22 provided on the second side plate 11, and a third fold line 23 continuing to the first fold line 21 and the second fold line 22. The pushing portion 20 includes a first portion 20a defined in the first side plate 10 by the fold lines 21 and 23 and the bent portion 13, and a second portion 20b defined in the second side plate 11 by the fold lines 22 and 23 and the bent portion 13.

[0030] The first fold lines 21 are provided on the bent portion 13 side of the first side panel 10, that is, on both sides of the first side panel 10 in the width direction X. Each first fold line 21 is inclined upward in the width direction X from the bent portion 13 side of the first side panel 10 toward the center. More specifically, the lower end 21a of the first fold line 21 is located in the middle part of the height direction Z of the first side panel 10 and is spaced apart from the bent portion 13 in the width direction X. The upper end 21b of the first fold line 21 is located above the lower end 21a and spaced apart from the upper end 10a of the first side panel 10. However, the height position of the lower end 21a can be changed as necessary.

[0031] In this embodiment, the first fold line 21 is a straight line connecting the lower end 21a and the upper end 21b at the shortest distance. However, the first fold line 21 may be an arc as long as the first side panel 10 can be bent along the first fold line 21. The total length of the first fold line 21 from the lower end 21a to the upper end 21b can also be changed as necessary as long as the first side panel 10 can be bent along the first fold line 21.

[0032] The second fold lines 22 are provided on the side of the bent portion 13 of the second side plate 11, that is, on both sides of the second side plate 11 in the length direction Y. Each second fold line 22 is inclined upward from the bent portion 13 side of the second side plate 11 toward the center in the length direction Y. More specifically, the lower end 22a of the second fold line 22 is disposed at the same height as the lower end 21a of the first fold line 21, is located in the middle part of the height direction Z of the second side plate 11, and is positioned at a distance from the bent portion 13 in the length direction Y. The upper end 22b of the second fold line 22 is disposed at the same height as the upper end 21b of the first fold line 21, and is positioned at a distance from the upper end 11a of the second side plate 11. However, the height position of the lower end 22a can be changed as necessary.

[0033] In this embodiment, the second fold line 22 is a straight line connecting the lower end 22a and the upper end 22b at the shortest distance. However, the second fold line 22 may be an arc as long as the second side panel 11 can be bent along the second fold line 22. The total length of the second fold line 22 from the lower end 22a to the upper end 22b can also be changed as necessary as long as the second side panel 11 can be bent along the second fold line 22.

[0034] The third fold line 23 is generally U-shaped and is provided between the lower end 21a of the first fold line 21 and the lower end 22a of the second fold line 22. In other words, the third fold line 23 straddles the fold portion 13 and is provided from the first side plate 10 to the second side plate 11. One end of the third fold line 23 is connected to the lower end 21a of the first fold line 21, and the other end of the third fold line 23 is connected to the lower end 22a of the second fold line 22.

[0035] In the following description, of the four press-in portions 20, the press-in portion at one end of the first side plate 10A to which the attachment portion 12 is attached may be referred to as 20A.

[0036] 4 and 5, the first fold line 21 of the pressing portion 20 other than the pressing portion 20A is a lead line having one general-purpose line 21c and one cutting line 21d provided in the center on the general-purpose line 21c.

[0037] 4 and 6, the first fold line 21A of the push-in portion 20A is composed of a plurality of cutting lines 21e formed on the first side plate 10A and a general-purpose crease 21f formed on the attachment portion 12. By providing a plurality of cutting lines 21e at intervals in the portion of the first side plate 10A to which the attachment portion 12 is attached, the bendability of the first side plate 10A including the attachment portion 12 is improved.

[0038] 4 and 5, the second fold lines 22 of the four pressing sections 20 all consist of a lead crease having one general crease 22c and one cutting line 22d provided in the center on the general crease 22c.

[0039] The third fold lines 23 of the four pressing portions 20 are all general-purpose creases.

[0040] The first fold lines 21, 21A, the second fold line 22, and the third fold line 23 can be changed as necessary as long as they can bend the corresponding first side plate 10 and second side plate 11. In addition, the first fold line 21, the second fold line 22, and the third fold line 23 are not limited to being continuous from one end to the other end, and may be provided intermittently (discontinuously).

[0041] 1 and 5, the first positioning protrusions 25 each protrude upward from the upper end 10a of the first side plate 10. No bending or cutting lines are provided between the first positioning protrusions 25 and the first side plate 10. The first positioning protrusions 25 are defined by a pair of first curved edges 25a continuing to the upper end 10a of the first side plate 10, a pair of first inclined edges 25b each continuing to the pair of first curved edges 25a, and one first upper edge 25c continuing to both of the pair of first inclined edges 25b.

[0042] The first curved edge 25a is an arc shape with a predetermined curvature, and contacts the upper end 10a and the first inclined edge 25b of the first side plate 10. The first curved edge 25a in this embodiment is located directly above the upper end 21b of the first fold line 21 with a gap therebetween.

[0043] The first inclined edge 25b is inclined upward from the outer side toward the center in the width direction X of the first side plate 10. In this embodiment, the first inclined edge 25b is a straight line connecting the end of the first curved edge 25a and the end of the first upper edge 25c by the shortest distance. However, the first inclined edge 25b may be an arc shape.

[0044] The first upper edge 25c is located above the upper end 13a of the folded portion 13 (fold line 13') and extends in the width direction X. The end 25d of the first upper edge 25c is located closer to the center in the width direction X than the upper end 21b of the first fold line 21 located closest thereto. The first upper edge 25c in this embodiment is a straight line connecting one end 25d and the other end 25d at the shortest distance. However, the first upper edge 25c may be an arc-shaped shape that protrudes upward or a arc-shaped shape that recesses downward.

[0045] 1 and 5, the second positioning protrusions 26 each protrude upward from the upper end 11a of the second side plate 11. No bending or cutting lines are provided between the second positioning protrusions 26 and the second side plate 11. The second positioning protrusions 26 are defined by a pair of second curved edges 26a continuing to the upper end 11a of the second side plate 11, a pair of second inclined edges 26b each continuing to the pair of second curved edges 26a, and one second upper edge 26c continuing to the pair of second inclined edges 26b.

[0046] The second curved edge 26a is an arc shape with a predetermined curvature, and contacts the upper end 11a and the second inclined edge 26b of the second side plate 11. The second curved edge 26a in this embodiment is located directly above the upper end 22b of the second fold line 22 with a gap therebetween.

[0047] The second inclined edge 26b is inclined upward from the outer side toward the center in the longitudinal direction Y of the second side plate 11. In this embodiment, the second inclined edge 26b is a straight line connecting the end of the second curved edge 26a and the end of the second upper edge 26c by the shortest distance. However, the second inclined edge 26b may be an arc.

[0048] The second upper edge 26c is located above the upper end 13a of the folded portion 13 (fold line 13') and extends in the longitudinal direction Y. The end 26d of the second upper edge 26c is located closer to the center in the longitudinal direction Y than the upper end 22b of the second fold line 22 located closest thereto. The second upper edge 26c in this embodiment is a straight line connecting one end 26d and the other end 26d at the shortest distance. However, the second upper edge 26c may be an arc-shaped shape that protrudes upward or a arc-shaped shape that recesses downward.

[0049] 1, the first positioning protrusion 25 is provided in a central region in the width direction X of the first side plate 10, and the second positioning protrusion 26 is provided in a central region in the length direction Y of the second side plate 11. As a result, a notch is formed between the adjacent first positioning protrusion 25 and second positioning protrusion 26.

[0050] The first upper edge 25c of the first positioning protrusion 25 and the second upper edge 26c of the second positioning protrusion 26 are located at the same height. The protruding dimension of the first positioning protrusion 25, i.e., the distance from the upper end 10a of the first side plate 10 to the first upper edge 25c of the first positioning protrusion 25, is the same as the protruding dimension of the second positioning protrusion 26, i.e., the distance from the upper end 11a of the second side plate 11 to the second upper edge 26c of the second positioning protrusion 26.

[0051] It is preferable that the protruding dimension of the first positioning protrusion 25 relative to the total height of the first side plate 10 and the protruding dimension of the second positioning protrusion 26 relative to the total height of the second side plate 11 are both between 5% and 50%. When stacking trays 1, articles cannot be accommodated in the portions where the positioning protrusions 25, 26 are formed, so if the protruding dimension is made too large, the trays 1 will become unnecessarily large. If the protruding dimension is made too small, it will be difficult to position and maintain the stacked trays 1. To prevent these inconveniences, it is preferable that the protruding dimensions of the positioning protrusions 25, 26 are set within the ranges specified above.

[0052] Next, the first fold line 21 and the second fold line 22 will be described in more detail.

[0053] First, fruits and vegetables that contain moisture and have a high specific gravity are stored as items in the tray 1. Therefore, in consideration of the rigidity of the tray 1, it is preferable to use a cardboard sheet having a thickness of 1 mm to 8 mm as the material for forming the tray 1, and in this embodiment, a cardboard sheet having a thickness of 4 mm is used.

[0054] As the thickness of a cardboard sheet increases, the elastic restoring force increases, and this restoring force affects the pushing of the pushing part 20. If the tray 1 is made of a single sheet of paper such as cardboard or cardboard, the restoring force is smaller than that of a cardboard sheet, so even if the angle α (see FIG. 5) between the first fold line 21 and the second fold line 22 is small, it is possible for the pushing part 20 to be pushed inward. However, because the restoring force of a cardboard sheet is greater than that of a single sheet of paper, the angle α must be set within an appropriate range.

[0055] The angle α between the first fold line 21 and the second fold line 22 is preferably set to 30 degrees or more and 120 degrees or less, and more preferably set to 40 degrees or more and 100 degrees or less. If the angle α is too small, even if the pushing part 20 is pushed into the outer peripheral wall 2 as shown in FIG. 3, the pushing part 20 returns to the state before pushing as shown in FIG. 1 due to the restoring force of the cardboard sheet. If the angle α is too large, the upper end 13a of the folding part 13 falls too far into the outer peripheral wall 2, so that the volume that can accommodate the article is reduced. In order to prevent these inconveniences, the angle α is preferably set within the above-specified range, and is set to 60 degrees in this embodiment.

[0056] 5, the angle α between the first fold line 21 and the second fold line 22 is the sum of the angle β between the fold line 13' (fold portion 13) and the first fold line 21 and the angle γ between the fold line 13' and the second fold line 22. In this embodiment, the angles β and γ are both set to 30 degrees, but the angles β and γ may be different as long as they are within the above-specified range.

[0057] Next, how to use the tray 1 will be described.

[0058] As shown in FIG. 1, when no other tray 1 is stacked on the tray 1, the pushing portion 20 is not pushed in. In this state, the first portion 20a of the pushing portion 20 is located on the same plane as the first side plate 10, and the second portion 20b is located on the same plane as the second side plate 11. Also, as shown in FIG. 7A, the first side plate 10 and the second side plate 11 extend in the perpendicular direction, and the angle θ1 between the first portion 20a and the second portion 20b of the pushing portion 20 is 90 degrees. Also, the shortest distance connecting the upper end 21b of the first fold line 21 and the upper end 22b of the second fold line 22 is L1.

[0059] 8 and 9, when stacking another tray 1 on a tray 1, all of the push-in portions 20 at the four corners of the outer peripheral wall 2 are pushed inward as shown in Fig. 3. This causes the upper portion 13b of the folding portion 13 located within the push-in portion 20 to be valley-folded. Also, the first side plate 10 is mountain-folded along the first folding line 21, and the second side plate 11 is mountain-folded along the second folding line 22.

[0060] 7B, in the pressed-in state of the pressing section 20, the angle θ2 between the first portion 20a and the second portion 20b of the pressing section 20 becomes larger than 90 degrees due to the restoring force of the cardboard sheet. As a result, the shortest distance connecting the upper end 21b of the first fold line 21 and the upper end 22b of the second fold line 22 becomes L2, and this distance L2 is longer than the distance L1 before pressing.

[0061] The angle θ2 between the first portion 20a and the second portion 20b decreases as the angle α (see FIG. 5) between the first fold line 21 and the second fold line 22 increases, and increases as the angle α (see FIG. 5) decreases. When the tray 1 is formed from a single sheet of paper, it is not impossible to make the angle θ2 90 degrees or less, but when the tray 1 is formed from a cardboard sheet, it is difficult to make the angle θ2 90 degrees or less.

[0062] As described above, when the angle θ2 between the first portion 20a and the second portion 20b is made larger than 90 degrees and the distance L2 between the upper ends 21b, 22b of the first fold line 21 and the second fold line 22 is made longer than the distance L1 before pressing, a part of the first side panel 10 and a part of the second side panel 11 are inclined to widen upward.

[0063] Specifically, of the first side plate 10 including the first positioning protrusion 25, a portion other than the push-in portion 20 and a portion above the lower end of the push-in portion 20 in the height direction Z are inclined outwardly from the bottom to the top. Also, of the second side plate 11 including the second positioning protrusion 26, a portion other than the push-in portion 20 and a portion above the lower end of the push-in portion 20 in the height direction Z are inclined outwardly from the bottom to the top. As a result, the first positioning protrusion 25 connected to the upper end 10a of the first side plate 10 and the second positioning protrusion 26 connected to the upper end 11a of the second side plate 11 also incline outwardly from the bottom to the top.

[0064] The inclination angle of the first side plate 10 and the inclination angle of the second side plate 11 increase as the angle θ2 between the first portion 20a and the second portion 20b increases, and decrease as the angle θ2 decreases.

[0065] The portions of the first side plate 10 and the second side plate 11 below the push-in portion 20 maintain a state of extending in the perpendicular direction. However, the portion below the push-in portion 20 is not limited to the lower portion in the strict geometric sense, and even if it is the portion below the push-in portion 20, the intermediate portion of the first side plate 10 and the second side plate 11 in the height direction Z may be inclined to widen upward due to the elasticity of the cardboard sheet.

[0066] As described above, in the tray 1 of this embodiment, by pushing the pushing portion 20 inward, the portions of the first side plate 10 including the first positioning protrusion 25 and the second side plate 11 including the second positioning protrusion 26 other than the pushing portion 20 and above the pushing portion 20 can be tilted upward and wider. This improves the workability when stacking the trays 1 and the stability when multiple trays 1 are stacked.

[0067] 8 and 9, due to the inclination of the first side plate 10 and the second side plate 11, the outer shape of the opening 4 defined by the first upper edge 25c of the first positioning protrusion 25 and the second upper edge 26c of the second positioning protrusion 26 becomes larger than the outer shape of the bottom wall 3. Therefore, the bottom wall 3 of the upper tray 1 can be easily positioned in the opening 4 of the lower tray 1. This improves the workability when stacking the trays 1.

[0068] 8 and 9, when the trays 1 are stacked, the bottom wall 3 of the upper tray 1 is placed on the push-in portion 20 of the lower tray 1. In addition, the first positioning protrusion 25 of the lower tray 1 is located outside the first side plate 10 of the upper tray 1, and the second positioning protrusion 26 of the lower tray 1 is located outside the second side plate 11 of the upper tray 1. Therefore, the movement of the upper tray 1 in the lateral directions (X direction and Y direction) relative to the lower tray 1 is restricted by both positioning protrusions 25, 26. This improves stability in the stacked state and prevents the load from collapsing when an external force is applied.

[0069] The angle β between the folding portion 13 and the first folding line 21 plus the angle γ between the folding portion 13 and the second folding line 22 is equal to or greater than 30 degrees and equal to or less than 120 degrees. Therefore, the pushing portion 20 can be reliably pushed into even a paper corrugated cardboard sheet, which has a stronger elastic restoring force than single sheets such as thick paper or cardboard. Therefore, by pushing the pushing portion 20, the first side plate 10 including the first positioning protrusion 25 and the second side plate 11 including the second positioning protrusion 26 can be reliably tilted upwardly.

[0070] The container of this embodiment is a square cylindrical tray 1 with an open top and a closed bottom. A push-in portion 20 and positioning protrusions 25, 26 are formed on the tray 1, improving the workability of stacking the trays 1 containing articles and the stability of the stacked trays 1. Therefore, the tray 1 of this embodiment can also be used as a substitute for a plastic container (banju).

[0071] Other embodiments and various modifications of the present invention will be described below, but in these descriptions, points that are not particularly mentioned are the same as those in the first embodiment. In the drawings referred to below, the same elements as those in the first embodiment are given the same reference numerals.

[0072] Second embodiment 10 shows a part of a tray blank of the second embodiment. The second embodiment differs from the first embodiment in that the first curved edge 25a of the first positioning protrusion 25 is positioned closer to the center in the width direction than the upper end 21b of the first fold line 21, and the second curved edge 26a of the second positioning protrusion 26 is positioned closer to the center in the length direction than the upper end 22b of the second fold line 22.

[0073] Third embodiment 11 shows a part of a tray blank of the third embodiment. The third embodiment differs from the first embodiment in that the first positioning protrusion 25 is defined by a first curved edge 25a and a first upper edge 25c, and the second positioning protrusion 26 is defined by a second curved edge 26a and a second upper edge 26c. The first curved edge 25a is an arc shape whose center is located on an extension line of the upper end 10a of the first side plate 10. The second curved edge 26a is an arc shape whose center is located on an extension line of the upper end 11a of the second side plate 11.

[0074] (Fourth embodiment) Fig. 12 shows a part of a tray blank of the fourth embodiment. The fourth embodiment differs from the first embodiment in that the first positioning protrusion 25 is defined by a first curved edge 25a and a first upper edge 25c, and the second positioning protrusion 26 is defined by a second curved edge 26a and a second upper edge 26c, and these curved edges 25a, 26a are formed in a single arc shape. In the fourth embodiment, the positioning protrusions 25, 26 protrude upward from the entire side plates 10, 11, so that the upper end 10a of the first side plate 10 and the upper end 11a of the second side plate 11 are shown by virtual lines in Fig. 12.

[0075] The first curved edge 25a is a concave arc shape that tapers from an end 25d of the first upper edge 25c to the upper end 13a of the fold line 13' (folded portion 13) and has a center located on the upper side. The second curved edge 26a is a concave arc shape that tapers from an end 26d of the second upper edge 26c to the upper end 13a of the fold line 13' (folded portion 13) and has a center located on the upper side. The first curved edge 25a and the second curved edge 26a are each formed by a single curve that is joined at the upper end 13a on the fold line 13'.

[0076] In the trays of the second to fourth embodiments configured as above, the same actions and effects as in the first embodiment can be obtained.

[0077] Fifth embodiment Fig. 13 shows a part of a tray blank of the fifth embodiment. The fifth embodiment differs from the first embodiment in that the first positioning protrusion 25 is defined by two curved edges 25a, 25e and a first upper edge 25c, and the second positioning protrusion 26 is defined by two curved edges 26a, 26e and a second upper edge 26c. In Fig. 13, the upper end 10a of the first side plate 10 and the upper end 11a of the second side plate 11 are shown by virtual lines.

[0078] The curved edge 25e of the first positioning protrusion 25 is an arc shape that tapers downward from the upper end 13a of the fold line 13' (folded portion 13) toward the width direction center of the first side plate 10 and has a center located on the lower side. The curved edge 25a of the first positioning protrusion 25 is connected to the end of the curved edge 25e and the end 25d of the first upper edge 25c, and has an arc shape with a center located on an extension line of the first upper edge 25c.

[0079] The curved edge 26e of the second positioning protrusion 26 is an arc shape that tapers downward from the upper end 13a of the fold line 13' (folded portion 13) toward the center of the second side plate 11 in the longitudinal direction, with the center located at the lower side. The curved edge 26e of the second positioning protrusion 26 and the curved edge 25e of the first positioning protrusion 25 are formed by a single curve whose one end is connected to the upper end 13a of the fold line 13' (folded portion 13). The curved edge 26a of the second positioning protrusion 26 is an arc shape that is connected to the end of the curved edge 26e and the end 26d of the second upper edge 26c, and whose center is located on the extension line of the second upper edge 26c.

[0080] Sixth embodiment Fig. 14 shows a part of a tray blank of the sixth embodiment. The sixth embodiment differs from the first embodiment in that the first positioning protrusion 25 is defined by two inclined edges 25b, 25f and a first upper edge 25c, and the second positioning protrusion 26 is defined by two inclined edges 26b, 26f and a second upper edge 26c. In Fig. 14, the upper end 10a of the first side plate 10 and the upper end 11a of the second side plate 11 are shown by virtual lines.

[0081] The inclined edge 25f of the first positioning protrusion 25 is inclined downward from the upper end of the fold line 13' toward the widthwise center of the first side plate 10. The inclined edge 25b of the first positioning protrusion 25 is connected to an end of the inclined edge 25f and an end 25d of the upper edge 25c, and is inclined from the lower side to the upper side toward the widthwise center of the first side plate 10.

[0082] The inclined edge 26f of the second positioning protrusion 26 is inclined downward from the upper end of the folding line 13' toward the center in the longitudinal direction of the second side plate 11. The inclined edge 26f of the second positioning protrusion 26 and the inclined edge 25f of the first positioning protrusion 25 are connected at one end to the upper end 13a of the folding line 13' (folded portion 13). The inclined edge 26b of the second positioning protrusion 26 is connected to the end of the inclined edge 26f and the end 26d of the upper edge 26c, and is inclined from the lower side to the upper side toward the center in the longitudinal direction of the second side plate 11.

[0083] In the trays of the fifth and sixth embodiments configured as described above, when the pushing portion 20 is pushed in as shown in Fig. 3, the tip of the upwardly protruding curved edge 25e, 26e or the tip of the inclined edge 25f, 26f becomes the highest position in the height direction. Therefore, as shown in Figs. 8 and 9, the stability of the stacked trays can be further improved.

[0084] Seventh embodiment 15 shows a part of a tray blank of the seventh embodiment. The seventh embodiment differs from the first embodiment in that the angle β between the fold line 13' (fold portion 13) and the first fold line 21 is different from the angle γ between the fold line 13' (fold portion 13) and the second fold line 22. The angle obtained by adding the angles β and γ, that is, the angle α between the first fold line 21 and the second fold line 22, is set in the same way as in the first embodiment.

[0085] In the seventh embodiment configured as above, it is possible to obtain the same functions and effects as the first embodiment.

[0086] The first to sixth embodiments may be combined as necessary. That is, one of the first to sixth embodiments may be selected as the first positioning protrusion 25, and one of the first to sixth embodiments other than the first positioning protrusion 25 may be selected as the second positioning protrusion 26. In this case, the angle β between the fold line 13' (folding portion 13) and the first fold line 21 and the angle γ between the fold line 13' (folding portion 13) and the second fold line 22 may be made different as in the seventh embodiment.

[0087] The container (tray 1) of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

[0088] For example, the push-in portion 20 may be defined by the first fold line 21 and the second fold line 22 without providing the third fold line 23. In this case, the lower end 21a of the first fold line 21 may be disposed on the fold portion 13, and the lower end 22a of the second fold line 22 may also be disposed on the fold portion 13.

[0089] The bottom wall 3 may have the configuration of the first to third modified examples described below.

[0090] 16 and 17 show a tray 1 of a first modified example. This tray 1 employs an interlocking bottom wall 3. Specifically, the bottom wall 3 includes a pair of short flaps 30A, 30B and a pair of long flaps 31A, 31B. The pair of short flaps 30A, 30B are provided with a notch 30a in an area where they overlap with the long flap 31B. The pair of long flaps 31A, 31B are formed with dimensions such that their tip portions overlap each other. The long flap 31A is formed in a roughly trapezoidal shape. The long flap 31B is formed in a rectangular shape, and a notch 31a is provided in the center of its tip.

[0091] After folding the long flap 31B against the outer peripheral wall 2, the pair of short flaps 30A, 30B are folded. Then, the long flap 31A is folded and the tip of the long flap 31A is placed on the inner surface side of the long flap 31B through the cutouts 30a, 31a. This allows the closed state to be maintained simply by the engagement of the flaps 30A, 30B, 31A, 31B.

[0092] 18 and 19 show a tray 1 of a second modified example. This tray 1 employs a non-staple lock type bottom wall 3 different from that of the first modified example. Specifically, the bottom wall 3 has a pair of short flaps 33 and a pair of long flaps 34. Each of the pair of short flaps 33 is provided with a pair of locking pieces 33a and one folding line 33b. Each of the pair of long flaps 34 is provided with a pair of locking holes 34a into which the pair of locking pieces 33a are inserted and locked.

[0093] After folding each of the pair of long flaps 34 against the outer peripheral wall 2, the pair of short flaps 33 are folded. At this time, the short flaps 33 are folded along the folding lines 33b, and the pair of locking edges 33a are inserted into the locking holes 34a of the long flaps 34. This allows the closed state to be maintained simply by the engagement of the flaps 33, 34.

[0094] 20 and 21 show a tray 1 of a third modified example. This tray 1 employs a bottom wall 3 of a one-action type. Specifically, the bottom wall 3 includes a pair of short flaps 36 and a pair of long flaps 37. Each of the pair of short flaps 36 is formed in a roughly trapezoidal shape. An attachment portion 37a is connected to each of the pair of long flaps 37 via a folding line 37b. The pair of attachment portions 37a are attached to the outer surfaces of different ones of the pair of short flaps 36.

[0095] With the first side plate 10A and the second side plate 11B overlapping with each other, the outer peripheral wall 2 is expanded into a rectangular tube shape, whereby the pair of short flaps 36 and the pair of long flaps 37 are bent inward in unison, and the lower end of the outer peripheral wall 2 is automatically closed.

[0096] The outer peripheral wall 2 may be in the shape of a triangular cylinder, or may be in the shape of a cylinder with five or more sides. The container is not limited to the tray 1, and may be a packaging box with a top lid on the upper end of the outer peripheral wall 2. The top lid may be configured to be continuous with one of the multiple side panels, or may be configured with multiple flaps like the bottom wall 3. [Explanation of symbols]

[0097] 1...Tray (container) 2...Outer wall 3…Bottom wall 4…Aperture 10,10A,10B…1st side plate 10a…Top end 11,11A,11B…Second side plate 11a…Top end 12…Attached section 13...Bending part 13a…Top end 13b...upper part 13'...Folding line 14…Handle hole 15…Inner flap 16…Outer flap 17...Bending part 17'…Folding line 20, 20A…Push-in section 20a…Part 1 20b…Second part 21,21A…1st fold curve 21a…lower end 21b…Top end 21c…General ruled lines 21d…cutting line 21e…cutting line 21f…General ruled line 22…Second folding curve 22a…lower end 22b…Top end 22c…General ruled line 22d…cutting line 23…Third folding curve 25…First positioning protrusion 25a…First curved edge 25b...First beveled edge 25c...first upper edge 25d...end 25e…curved edge 25f…Beveled edge 26...Second positioning protrusion 26a…Second curved edge 26b...Second beveled edge 26c…Second upper edge 26d...end 26e…curved edge 26f...Sloped edge 30A, 30B…Short flap 30a…Notch 31A, 31B…Long flaps 31a…Notch 33…Short flap 33a...locking piece 33b…Folding line 34…Long flap 34a…Latching hole 36…Short flap 37…Long flap 37a…Adhesion part 37b…Folding line

Claims

1. A first side plate extending in a height direction and a width direction intersecting the height direction; a second side plate that is connected to one end of the first side plate in the width direction via a mountain fold portion and extends in the height direction and in a length direction that intersects both the height direction and the width direction; Equipped with The first side plate is provided in a pair at an interval in the longitudinal direction, The second side plates are provided in a pair at an interval in the width direction, a pair of the first side plates and a pair of the second side plates form an outer peripheral wall having a rectangular cylindrical shape, A container, wherein a lower end of the outer peripheral wall is closed by a bottom wall, and an upper end of the outer peripheral wall is open, A push-in portion is defined by a first fold line provided on the mountain fold portion side of the first side plate and inclined upward from the mountain fold portion side toward the center in the width direction, and a second fold line provided on the mountain fold portion side of the second side plate and inclined upward from the mountain fold portion side toward the center in the length direction; a first positioning protrusion protruding upward from the first side plate and having a first upper edge extending in the width direction above an upper end of the mountain fold, the end of the first upper edge on the mountain fold side being located closer to the center in the width direction than an upper end of the first fold line; a second positioning protrusion that protrudes upward from the second side plate and has a second upper edge that extends in the longitudinal direction above an upper end of the mountain fold, and an end of the second upper edge on the mountain fold side is located toward the center in the longitudinal direction relative to an upper end of the second fold line; Equipped with When the pushing portion is pushed inward so that the portion of the mountain fold located within the pushing portion becomes a valley fold, the first side panel becomes a mountain fold along the first fold line and the second side panel becomes a mountain fold along the second fold line, and the portions of the first side panel including the first positioning protrusion and the second side panel including the second positioning protrusion other than the pushing portion and above the lower end of the pushing portion can each be tilted outward from the bottom to the top.

2. The container is made of a paper corrugated sheet having a thickness of 1 mm or more, The sum of the angle between the mountain fold and the first fold line and the angle between the mountain fold and the second fold line is 30 degrees or more and 120 degrees or less.

2. The container of claim 1.

3. The first positioning protrusion includes a first curved edge connected to an upper end of the first side plate, the second positioning protrusion includes a second curved edge continuing to an upper end of the second side plate; 3. A container according to claim 1 or 2.

4. The first curved edge is provided so as to be located directly above the upper end of the first fold line, The second curved edge is provided so as to be located directly above the upper end of the second fold line.

4. The container of claim 3.

5. The first positioning protrusion includes a portion extending downward from an upper end of the mountain fold portion located at an upper end of the first side plate toward the center in the width direction, The second positioning protrusion includes a portion extending downward from an upper end of the mountain-folded portion located at an upper end of the second side plate toward a center in the longitudinal direction.

3. A container according to claim 1 or 2.

6. A container as described in claim 1 or 2, wherein an angle between the first fold line and the mountain fold portion is different from an angle between the second fold line and the mountain fold portion.

Images