JP7485968B2 - Packaging - Google Patents

Description

This disclosure relates to packaging.

For example, a packaging device shown in Patent Document 1 is known as a device for packaging items such as indoor units of air conditioners. In the packaging device shown in Patent Document 1, cushioning material is glued and fixed to the top surface of a bottom tray made of cardboard, and the item is placed on top of the cushioning material.

JP 2008-30753 A

In addition to the cushioning material, a reinforcing plate made of wood may be glued and fixed to the bottom tray of the packaging device. In this case, since the bottom plate and the reinforcing plate are made of different materials and are glued together, it becomes troublesome to separate and discard the bottom tray and the reinforcing plate when disposing of the packaging device.

The present disclosure aims to provide a package that allows the tray and reinforcing plate to be easily separated and disposed of.

(1) The package of the present disclosure is
A tray having a flat portion covering one side of the packaged item and made of a cardboard sheet;
A reinforcing plate is disposed along the flat portion and extends in a first direction,
The tray comprises:
A first outer wall formed by folding the cardboard sheet from one end of the flat portion in the first direction to one side in a second direction perpendicular to the flat portion;
A second outer wall formed by folding the cardboard sheet from the other end of the flat portion in the first direction to the one side in the second direction;
A first inner wall is disposed closer to the second outer wall than the first outer wall and is formed by folding back the cardboard sheet from a folded tip of the first outer wall to the other side in the second direction;
A second inner wall is disposed closer to the first outer wall than the second outer wall and is formed by folding back the cardboard sheet from the folded tip of the second outer wall to the other side in the second direction,
A first groove is formed in the first inner wall and opens at the other end in the second direction,
A second groove is formed in the second inner wall and opens at the other end in the second direction.
One end of the reinforcing plate in the first direction is inserted into the first groove, and the other end of the reinforcing plate in the first direction is inserted into the second groove.

When disposing of the package constructed in this manner, the reinforcing plate can be easily removed from the tray by pulling out one end and the other end of the reinforcing plate from the first groove in the first inner wall and the second groove in the second inner wall, respectively. Therefore, when the reinforcing plate is made of a material different from that of the tray, the tray and the reinforcing plate can be easily disposed of separately.

(2) It is preferable that a slit is cut in the first inner wall from the bottom surface of the first groove toward the one side in the second direction.
When assembling the package, when one end of the reinforcing plate is pushed into the other side in the second direction while abutting against the first inner wall and inserted into the first groove, the portion of the first inner wall with which the one end of the reinforcing plate abuts tends to warp toward the first outer wall due to the slit, thereby making it easy to insert the one end of the reinforcing plate into the first groove.

(3) A plurality of the slits are cut into the first inner wall,
The plurality of slits preferably include a first slit cut from one end of the bottom surface and a second slit cut from the other end of the bottom surface.
With this configuration, the portion of the first inner wall where one end of the reinforcing plate abuts is made more likely to warp toward the first outer wall due to the first slit and the second slit, making it even easier to insert one end of the reinforcing plate into the first groove.

(4) When the other end of the reinforcing plate is inserted into the second groove, the distance in the second direction from the position where the one end of the reinforcing plate abuts against the first inner wall to the flat portion is h;
When the distance in the second direction from the bottom surface of the first groove to the flat portion is d,
The length dimension of the slit in the second direction is preferably (hd).
With this configuration, the length dimension of the slit in the second direction can be made as short as possible, so that damage to the first inner wall caused by the slit can be suppressed.

(5) It is preferable that a chamfer is formed at a corner between the bottom surface of the first groove and one side surface of the slit in the first inner wall.
With this configuration, when one side surface of the slit in the first inner wall comes into contact with the other side surface, the contact area can be reduced by the amount of the chamfered portion, so that the portion of the first inner wall where the one end of the reinforcing plate comes into contact is more likely to warp toward the first outer wall, making it easier to insert the one end of the reinforcing plate into the first groove.

(6) The chamfered portion is preferably a R-chamfered portion.
With this configuration, the portion of the first inner wall that abuts against the one end of the reinforcing plate is more likely to warp toward the first outer wall than when the chamfered portion is a C-chamfered portion, which makes it easier to insert the one end of the reinforcing plate into the first groove.

FIG. 1 is a perspective view illustrating a package according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing the package in a divided state. 2 is a cross-sectional view taken along the line II in FIG. 1 . FIG. FIG. 5 is an enlarged perspective view of a main portion of FIG. 4 showing the vicinity of a first groove of a first inner wall. FIG. FIG. 13 is a perspective view of the tray showing a state in which the reinforcing plate is being attached. FIG. 8 is an enlarged perspective view of a main portion of FIG. 7 . 11A to 11C are diagrams showing a method of attaching a reinforcing plate. 11A to 11C are diagrams showing a method of attaching a reinforcing plate. FIG. 13 is a perspective view of the tray showing a state after the reinforcing plate is attached. 5 is a cross-sectional view taken along the line II-II of FIG. 4. FIG. 13 is a diagram showing a method for calculating the length dimension of a slit. FIG. 13 is a diagram showing a method for calculating the length dimension of a slit.

Hereinafter, embodiments will be described with reference to the accompanying drawings.
[Package Composition]
Fig. 1 is a perspective view showing a packaging body 1 according to an embodiment of the present disclosure. Fig. 2 is a perspective view showing a state in which the packaging body 1 is divided. In Figs. 1 and 2, the packaging body 1 packages an object 80 to be packaged, such as a ceiling-mounted indoor unit of an air conditioner. The packaging body 1 of this embodiment includes a pair of trays 2, a plurality of cushioning materials 4, a plurality of reinforcing plates 5, and a plurality of supports 6.

Hereinafter, in this specification, the width direction of the packaged object 80 is also referred to as the first direction. The height direction of the packaged object 80 (direction perpendicular to the first direction) is also referred to as the second direction. The longitudinal direction of the packaged object 80 (direction perpendicular to the first direction and perpendicular to the second direction) is also referred to as the third direction.

The pair of trays 2 consists of a first tray (bottom tray) 2A and a second tray (top tray) 2B. The first tray 2A and the second tray 2B are each formed into a box shape using a paper corrugated sheet 20 (see FIG. 5). One end of the packaged item 80 in the second direction (the lower end in FIG. 2) is fitted into the first tray 2A. The other end of the packaged item 80 in the second direction (the upper end in FIG. 2) is fitted into the second tray 2B. Hereinafter, when describing matters common to the first tray 2A and the second tray 2B, they will be collectively referred to as tray 2.

The multiple cushioning materials 4 protect the packaged item 80 to cushion the shocks that occur during transportation of the packaged item 80. Each cushioning material 4 is made of a synthetic resin foam such as polystyrene foam. In this embodiment, the multiple cushioning materials 4 include a first cushioning material 4a, a second cushioning material 4b, a third cushioning material 4c, a fourth cushioning material 4d, a fifth cushioning material 4e, and a sixth cushioning material 4f.

Figure 3 is a cross-sectional view taken along the line I-I in Figure 1. Note that in Figure 3, the internal structure of the packaged object 80 is omitted. In Figures 2 and 3, the first to third cushioning materials 4a to 4c mainly protect the end surface 81 (the lower surface in Figure 2) of the packaged object 80 on one side in the second direction. The first to third cushioning materials 4a to 4c are attached to the first tray 2A. Specifically, the first cushioning material 4a is attached to one end of the first tray 2A in the third direction (the left end in Figure 2) with an adhesive or the like. The second cushioning material 4b is attached to the other end of the first tray 2A in the third direction (the right end in Figure 2) with an adhesive or the like. The third cushioning material 4c is attached to the first tray 2A with an adhesive or the like in the center between the first cushioning material 4a and the second cushioning material 4b.

The fourth to sixth cushioning materials 4d to 4f are arranged along the periphery of the packaged object 80 at positions corresponding to the first to third cushioning materials 4a to 4c, respectively. Specifically, the fourth cushioning material 4d is arranged at one end of the packaged object 80 in the third direction (the left end in FIG. 2) along the end face 82 on the other side of the second direction of the packaged object 80, and along the end faces 83 and 84 on both sides in the third direction. As a result, the fourth cushioning material 4d protects one end of each end face 82 to 84 of the packaged object 80 in the third direction. The fourth cushioning material 4d is formed so as to cover the entire end face 85 on one side of the packaged object 80 in the third direction (the left side in FIG. 3). As a result, the fourth cushioning material 4d also protects the end face 85 of the packaged object 80.

The fifth cushioning material 4e is arranged along each end face 82-84 of the packaged object 80 at the other end in the third direction of the packaged object 80 (the right end in FIG. 2). As a result, the fifth cushioning material 4e protects the other end in the third direction of each end face 82-84 of the packaged object 80. The fifth cushioning material 4e is formed so as to cover the entire end face 86 on the other side in the third direction of the packaged object 80 (the right side in FIG. 3). As a result, the fifth cushioning material 4e also protects the end face 86 of the packaged object 80. The sixth cushioning material 4f is arranged along each end face 82-84 of the packaged object 80 at the center in the third direction of the packaged object 80. As a result, the sixth cushioning material 4f protects the center in the third direction of each end face 82-84 of the packaged object 80.

The multiple reinforcing plates 5 include a first reinforcing plate 5a, a second reinforcing plate 5b, a third reinforcing plate 5c, and a fourth reinforcing plate 5d. The first to fourth reinforcing plates 5a to 5d are each made of wood extending in a first direction. The first reinforcing plate 5a and the second reinforcing plate 5b are arranged along the flat portion 21 (described later) of the first tray 2A. The first reinforcing plate 5a is arranged adjacent to the first cushioning material 4a between the first cushioning material 4a and the third cushioning material 4c of the flat portion 21. The second reinforcing plate 5b is arranged adjacent to the second cushioning material 4b between the second cushioning material 4b and the third cushioning material 4c of the flat portion 21.

The third reinforcing plate 5c and the fourth reinforcing plate 5d are arranged along the flat portion 21 (described below) of the second tray 2B. The third reinforcing plate 5c is arranged in a position facing the first reinforcing plate 5a on the flat portion 21 of the second tray 2B. The fourth reinforcing plate 5d is arranged in a position facing the second reinforcing plate 5b on the flat portion 21 of the second tray 2B. Hereinafter, when describing common features of the first to fourth reinforcing plates 5a to 5d, they will be collectively referred to as reinforcing plates 5.

The multiple pillars 6 include a first pillar 6a, a second pillar 6b, a third pillar 6c, and a fourth pillar 6d. The first to fourth pillars 6a to 6d are each made of wood extending in the second direction. The first pillar 6a and the second pillar 6b are arranged at intervals in the third direction on one side of the packaged item 80 in the first direction (the front side of the paper in FIG. 2). Both ends of the first pillar 6a in the second direction abut against the first reinforcing plate 5a and the third reinforcing plate 5c. Both ends of the second pillar 6b in the second direction abut against the second reinforcing plate 5b and the fourth reinforcing plate 5d.

The third support 6c and the fourth support 6d are arranged at a distance in the third direction on the other side of the packaged item 80 in the first direction (the far side of the paper in FIG. 2). Both ends of the third support 6c in the second direction abut the first reinforcing plate 5a and the third reinforcing plate 5c. Both ends of the fourth support 6d in the second direction abut the second reinforcing plate 5b and the fourth reinforcing plate 5d. Hereinafter, when describing common features of the first to fourth support pillars 6a to 6d, they will be collectively referred to as support pillars 6.

With the above configuration, both ends of each support 6 in the second direction are in contact with the reinforcing plate 5, so that when an impact force acts on the package 1 from the second direction during transportation of the packaged item 80, the concentrated load on each support 6 can be distributed and received by the reinforcing plate 5. This makes it possible to prevent the support 6 from breaking through the tray 2 and damaging the package 1.

[Tray configuration]
Fig. 4 is a perspective view showing the tray 2. Fig. 5 is a development view of the tray 2. In Figs. 4 and 5, the tray 2 is formed into a box shape by folding a single cardboard sheet 20 made of paper. The tray 2 has a flat portion 21, a first outer wall 22, a first connecting wall 23, a first inner wall 24, a second outer wall 25, a second connecting wall 26, a second inner wall 27, a pair of first insert walls 28, a pair of second insert walls 29, a third outer wall 31, a third connecting wall 32, a third inner wall 33, a fourth outer wall 34, a fourth connecting wall 35, and a fourth inner wall 36.

The flat portion 21 is formed to a size sufficient to cover one surface (end surface 81 or end surface 82) of the packaged item 80 facing the second direction (see FIG. 3). One end of the flat portion 21 in the first direction (the upper end in FIG. 5; the same applies below) is connected to the first outer wall 22 via a fold line 20a extending in the third direction. The length dimension in the first direction of the first outer wall 22 is shorter than the length dimension in the first direction of the flat portion 21.

The first connecting wall 23 is connected to one end of the first outer wall 22 in the first direction via a fold line 20b extending in the third direction. The length dimension in the first direction of the first connecting wall 23 is shorter than the length dimension in the first direction of the first outer wall 22. The first inner wall 24 is connected to one end of the first direction of the first connecting wall 23 via a fold line 20c extending in the third direction. The length dimension in the first direction of the first inner wall 24 is the same as the length dimension in the first direction of the first outer wall 22. The length dimensions in the third direction of each of the first outer wall 22, the first connecting wall 23, and the first inner wall 24 are the same as the length dimension in the third direction of the flat portion 21.

The second outer wall 25 is connected to the other end of the flat portion 21 in the first direction (the lower end in FIG. 5; the same applies below) via a fold line 20d extending in the third direction. The length dimension in the first direction of the second outer wall 25 is the same as the length dimension in the first direction of the first outer wall 22. The second connecting wall 26 is connected to the other end of the second outer wall 25 in the first direction via a fold line 20e extending in the third direction. The length dimension in the first direction of the second connecting wall 26 is the same as the length dimension in the first direction of the first connecting wall 23.

The second inner wall 27 is connected to the other end of the second connecting wall 26 in the first direction via a bend line 20f extending in the third direction. The length dimension in the first direction of the second inner wall 27 is the same as the length dimension in the first direction of the first inner wall 24. The length dimensions in the third direction of each of the second outer wall 25, the second connecting wall 26, and the second inner wall 27 are the same as the length dimension in the third direction of the flat portion 21.

The third outer wall 31 is connected to one end of the flat portion 21 in the third direction (the left end in FIG. 5; the same applies below) via a fold line 20g extending in the first direction. The length dimension in the third direction of the third outer wall 31 is the same as the length dimension in the first direction of the first outer wall 22 (second outer wall 25). The third connecting wall 32 is connected to one end of the third direction of the third outer wall 31 via a fold line 20h extending in the first direction. The length dimension in the third direction of the third connecting wall 32 is the same as the length dimension in the first direction of the first connecting wall 23 (second connecting wall 26).

The third inner wall 33 is connected to one end of the third connecting wall 32 in the third direction via a bend line 20i extending in the first direction. The length dimension in the third direction of the third inner wall 33 is the same as the length dimension in the first direction of the first inner wall 24 (second inner wall 27). The length dimensions in the first direction of each of the third outer wall 31, the third connecting wall 32, and the third inner wall 33 are the same as the length dimension in the first direction of the flat portion 21.

One end of the first outer wall 22 in the third direction is connected to one first insert wall 28 via a fold line 20j extending in the first direction. One end of the second outer wall 25 in the third direction is connected to the other first insert wall 28 via a fold line 20k extending in the first direction. The length dimension in the first direction of each first insert wall 28 is slightly shorter than the length dimension in the third direction of the third outer wall 31.

The other end in the third direction of the flat portion 21 (the right end in FIG. 5; the same applies below) is connected to the fourth outer wall 34 via a fold line 20m extending in the first direction. The length dimension in the third direction of the fourth outer wall 34 is the same as the length dimension in the third direction of the third outer wall 31. The other end in the third direction of the fourth outer wall 34 is connected to the fourth connecting wall 35 via a fold line 20n extending in the first direction. The length dimension in the third direction of the fourth connecting wall 35 is the same as the length dimension in the third direction of the third connecting wall 32.

The other end of the fourth connecting wall 35 in the third direction is connected to the fourth inner wall 36 via a fold line 20p extending in the first direction. The length dimension in the third direction of the fourth inner wall 36 is the same as the length dimension in the third direction of the third inner wall 33. The length dimensions in the first direction of each of the fourth outer wall 34, the fourth connecting wall 35, and the fourth inner wall 36 are the same as the length dimension in the first direction of the flat portion 21.

The other end of the first outer wall 22 in the third direction is connected to one of the second insert walls 29 via a fold line 20r extending in the first direction. The other end of the second outer wall 25 in the third direction is connected to the other second insert wall 29 via a fold line 20s extending in the first direction. The length dimension in the first direction of each of the second insert walls 29 is slightly shorter than the length dimension in the third direction of the fourth outer wall 34.

[How to assemble the tray]
A method of assembling the tray 2 by folding the cardboard sheet 20 from the state shown in Fig. 5 will be described. First, at one end of the flat portion 21 in the first direction, the first outer wall 22 is folded 90 degrees to one side in the second direction (the front side of the paper in Fig. 5; the same applies below) relative to the flat portion 21, starting from the folding line 20a. Then, the first connecting wall 23 is folded 90 degrees toward the flat portion 21 relative to the first outer wall 22, starting from the folding line 20b. Then, the first inner wall 24 is folded 90 degrees toward the flat portion 21 relative to the first connecting wall 23, starting from the folding line 20c.

By folding the first outer wall 22, the first connecting wall 23, and the first inner wall 24 as described above, as shown in FIG. 4, the first inner wall 24 is folded back from the folding tip (fold line 20b) of the first outer wall 22 via the first connecting wall 23 to the other side in the second direction (the lower side in FIG. 4; the same applies below). As a result, the first inner wall 24 is positioned closer to the flat portion 21 (the second outer wall 25 side) than the first outer wall 22. At one end of the flat portion 21 in the first direction, the first outer wall 22, the first connecting wall 23, and the first inner wall 24 form the first side wall body 2c of the tray 2.

Next, in FIG. 5, starting from fold line 20d at the other end of flat portion 21 in the first direction, second outer wall 25 is bent 90 degrees to one side in the second direction relative to flat portion 21. After that, starting from fold line 20e, second connecting wall 26 is bent 90 degrees toward flat portion 21 relative to second outer wall 25. Then, starting from fold line 20f, second inner wall 27 is bent 90 degrees toward flat portion 21 relative to second connecting wall 26.

By folding the second outer wall 25, the second connecting wall 26, and the second inner wall 27 as described above, as shown in FIG. 4, the second inner wall 27 is folded back from the folding tip (fold line 20e) of the second outer wall 25 to the other side in the second direction via the second connecting wall 26. As a result, the second inner wall 27 is positioned closer to the flat portion 21 (first outer wall 22) than the second outer wall 25. At the other end of the flat portion 21 in the first direction, the second outer wall 25, the second connecting wall 26, and the second inner wall 27 form the second side wall body 2d of the tray 2. The second side wall body 2d may be folded and formed before the first side wall body 2c.

5, each of the pair of first insert walls 28 at one end of the flat portion 21 in the third direction is folded 90 degrees toward the flat portion 21 with respect to the first outer wall 22 and the second outer wall 25 folded as described above, starting from the folding lines 20j and 20k. Next, the third outer wall 31 is folded 90 degrees toward one side in the second direction with respect to the flat portion 21 with respect to the folding line 20g as a starting point. After that, the third connecting wall 32 is folded 90 degrees toward the flat portion 21 with respect to the third outer wall 31 with respect to the folding line 20h as a starting point. Then, the third inner wall 33 is folded 90 degrees toward the flat portion 21 with respect to the third connecting wall 32 with respect to the folding line 20i as a starting point. As a result, the pair of first insert walls 28 are sandwiched between the third outer wall 31 and the third inner wall 33, as shown in FIG. At one end of the flat portion 21 in the third direction, the third side wall 2e of the tray 2 is formed by the third outer wall 31, the third connecting wall 32, the third inner wall 33, and a pair of first insertion walls 28.

5, each of the pair of second insert walls 29 at the other end of the flat portion 21 in the third direction is folded 90 degrees toward the flat portion 21 with respect to the first outer wall 22 and the second outer wall 25 folded as described above, starting from the folding lines 20r and 20s. Next, the fourth outer wall 34 is folded 90 degrees toward one side in the second direction with respect to the flat portion 21 with respect to the folding line 20m as a starting point. After that, the fourth connecting wall 35 is folded 90 degrees toward the flat portion 21 with respect to the fourth outer wall 34 with respect to the folding line 20n as a starting point. Then, the fourth inner wall 36 is folded 90 degrees toward the flat portion 21 with respect to the fourth connecting wall 35 with respect to the folding line 20p as a starting point. As a result, the pair of second insert walls 29 are sandwiched between the fourth outer wall 34 and the fourth inner wall 36 as shown in FIG. At the other end of the flat portion 21 in the third direction, the fourth side wall 2f of the tray 2 is formed by the fourth outer wall 34, the fourth connecting wall 35, the fourth inner wall 36, and a pair of second insertion walls 29. The fourth side wall 2f may be formed by bending before the third side wall 2e.

[Tray groove]
In Fig. 4, a pair of first grooves 7 are formed in the first inner wall 24 of the tray 2 with a gap therebetween in the third direction. Each first groove 7 is formed to a size that allows one end 51 of the reinforcing plate 5 in the first direction to be inserted therein (see Fig. 10). In this embodiment, the first groove 7 is a concave groove that opens at the tip (other end) of the first inner wall 24 in the second direction. The first groove 7 has a pair of side surfaces 7a, 7b and a bottom surface 7c. The pair of side surfaces 7a, 7b are formed to extend in the second direction and face each other. The bottom surface 7c is formed to extend in the third direction between the pair of side surfaces 7a, 7b.

A pair of second grooves 8 are formed in the second inner wall 27 of the tray 2 with a gap therebetween in the third direction. Each second groove 8 is formed to a size that allows the other end 52 of the reinforcing plate 5 in the first direction to be inserted (see FIG. 7). In this embodiment, the second groove 8 is a concave groove that opens at the tip (other end) of the second inner wall 27 in the second direction. The second groove 8 has a pair of side surfaces 8a, 8b and a bottom surface 8c. The pair of side surfaces 8a, 8b are each formed to extend in the second direction and face each other. The bottom surface 8c is formed to extend in the third direction between the pair of side surfaces 8a, 8b.

[slit]
Fig. 6 is an enlarged perspective view of a main part of Fig. 4 showing the vicinity of the first groove 7 of the first inner wall 24. In Fig. 4 and Fig. 6, a plurality of slits 10 are cut out in the first inner wall 24 from the bottom surface 7c of each first groove 7 toward one side in the second direction (the upper side in Fig. 6). The plurality of slits 10 include a first slit 11 and a second slit 12. The length of the first slit 11 in the second direction and the length dimension of the second slit 12 in the second direction are the same.

The first slit 11 is cut in the second direction from one end of the bottom surface 7c of the first groove 7 on the side surface 7a side. The first slit 11 has a pair of side surfaces 11a, 11b extending in the second direction. One side surface 11a is formed on the same plane as the side surface 7a of the first groove 7, and the other side surface 11b is formed opposite the side surface 11a with a small gap in the third direction.

The second slit 12 is cut in the second direction from the other end of the bottom surface 7c of the first groove 7 on the side surface 7b side. The second slit 12 has a pair of side surfaces 12a, 12b extending in the second direction. One side surface 12a is formed on the same plane as the side surface 7b of the first groove 7, and the other side surface 12b is formed opposite the side surface 12a with a small gap in the third direction.

[Beveled part]
A first chamfered portion (chamfered portion) 13 is formed at a corner formed by the bottom surface 7c of the first groove 7 in the first inner wall 24 and the side surface (one side surface) 11b of the first slit 11. Similarly, a second chamfered portion (chamfered portion) 14 is formed at a corner formed by the bottom surface 7c of the first groove 7 in the first inner wall 24 and the side surface (one side surface) 12b of the second slit 12. The first chamfered portion 13 and the second chamfered portion 14 in this embodiment are configured as R chamfers (chamfers in which the corners are cut into an arc shape). The first chamfered portion 13 and the second chamfered portion 14 may be C chamfers (chamfers in which the corners are cut into an inclined surface of about 45 degrees).

With the above configuration, tongue portions 15 are formed between the first slits 11 and the second slits 12 at positions corresponding to each first groove 7 on the first inner wall 24. The tongue portions 15 are made of a portion of the first inner wall 24 surrounded by the side surface 11b of the first slit 11, the first chamfered portion 13, the bottom surface 7c of the first groove 7, the second chamfered portion 14, and the side surface 12b of the second slit 12. The length dimension of the tongue portions 15 in the third direction is slightly longer than the length dimension of the reinforcing plate 5 in the third direction (see FIG. 8).

[How to attach the reinforcing plate]
Fig. 7 is a perspective view of the tray 2 showing a state in the middle of attaching the reinforcing plate 5. Fig. 8 is an enlarged perspective view of the main part of Fig. 7. When attaching each reinforcing plate 5 to the tray 2, as shown in Figs. 7 and 8, one end 51 of each reinforcing plate 5 is abutted against the tongue portion 15 of the first inner wall 24 with the other end 52 of each reinforcing plate 5 inserted into the second groove 8 of the second inner wall 27.

Next, from the state shown in FIG. 8, one end 51 of each reinforcing plate 5 is pushed toward the first groove 7 in the second direction. This pushing force causes the tongue 15 to warp toward the first outer wall 22 starting from the base ends of the first slit 11 and the second slit 12, as shown in FIG. 9. As the tongue 15 warps in this manner, one end 51 of each reinforcing plate 5 gradually moves toward the first groove 7 while abutting against the tongue 15.

When the one end 51 of each reinforcing plate 5 is further pushed toward the first groove 7 in the second direction from the state shown in FIG. 9, the one end 51 of each reinforcing plate 5 is positioned along the flat portion 21 as shown in FIG. 10. At that time, the contact between the one end 51 of each reinforcing plate 5 and the tongue portion 15 is released, and the tongue portion 15 returns to its original state from the state in which it is warped toward the first outer wall 22 in FIG. 9 due to the rebound of the cardboard sheet 20. As a result, the one end 51 of each reinforcing plate 5 is inserted into the first groove 7.

As a result, as shown in FIG. 11, one end 51 and the other end 52 of each reinforcing plate 5 are inserted into the first groove 7 and the second groove 8, respectively. As a result, each reinforcing plate 5 is removably held on the tray 2 by the first side wall body 2c and the second side wall body 2d while being arranged along the flat portion 21 of the tray 2.

[How to calculate the slit length]
12 is a cross-sectional view taken along the line II-II in FIG. 4. As shown in FIG. 12, the first side wall 2c and the second side wall 2d of the tray 2 are formed by folding the cardboard sheet 20 as described above. Therefore, the first side wall 2c and the second side wall 2d are inclined to both outer sides in the first direction (both left and right sides in FIG. 12) due to the rebound of the cardboard sheet 20 from the position where they are folded 90 degrees with respect to the flat portion 21. The length dimension L in the second direction of the slit 10 formed in the first inner wall 24 of the first side wall 2c is set in consideration of the degree of rebound of the cardboard sheet 20. A method for calculating the length dimension L of the slit 10 will be described below.

Figure 13 is a diagram showing how to calculate the length dimension L of the slit 10. The longitudinal length dimension g of the reinforcing plate 5 is set to be sufficiently long compared with the thickness dimension b of the cardboard sheet 20, the gap dimension c between the second outer wall 25 and the second inner wall 27, and the resilience degree e, i of the cardboard sheet 20. The resilience degree of the cardboard sheet 20 means the distance that an arbitrary point of the first side wall body 2c of the tray 2 moves in the first direction from the position before the resilience of the cardboard sheet 20 to the position after the resilience.

The degree of resilience e of the cardboard sheet 20 is the distance that the bottom surface 7c of the first groove 7 of the first inner wall 24 moves in the first direction from the position before the resilience of the cardboard sheet 20 to the position after the resilience. The degree of resilience i of the cardboard sheet 20 is the distance that the position where one end 51 of the reinforcing plate 5 abuts on the first inner wall 24 moves in the first direction from the position before the resilience of the cardboard sheet 20 to the position after the resilience when the other end 52 of the reinforcing plate 5 is inserted into the second groove 8.

In FIG. 13, the length L of the slit 10 is calculated by the following formula (1).
L = h - d ... (1)
"h" is the distance in the second direction from the position where one end 51 of the reinforcing plate 5 abuts against the first inner wall 24 to the flat portion 21 in a state where the other end 52 of the reinforcing plate 5 is inserted into the second groove 8 until it abuts against the second outer wall 25 after the corrugated cardboard sheet 20 rebounds. "d" is the distance in the second direction from the bottom surface 7c of the first groove 7 to the flat portion 21 after the corrugated cardboard sheet 20 rebounds. Both distances h and d can be determined by actual measurement.

The distance h in the above formula (1) can also be calculated by the following method without actually measuring it.
14, after the rebound of the cardboard sheet 20, in a state in which one end 51 and the other end 52 of the reinforcing plate 5 are inserted into the first groove 7 and the second groove 8, respectively, the length dimension g in the longitudinal direction (first direction) of the reinforcing plate 5 satisfies the relationship of the following formula (2). Note that the length dimension g in formula (2) is the minimum length dimension required for inserting one end 51 of the reinforcing plate 5 into the first groove 7 of the first inner wall 24 in a state in which the other end 52 of the reinforcing plate 5 is inserted into the second groove 8 until it abuts against the second outer wall 25.
g = f + e + a + b + c ... (2)

In the above formula (2), f is the insertion allowance (≧0) of one end 51 of the reinforcing plate 5 into the first groove 7. e is the degree of rebound of the cardboard sheet 20 described above. a is the distance in the first direction from the first inner wall 24 to the second inner wall 27 before the cardboard sheet 20 rebounds. b is the thickness dimension of the cardboard sheet 20 described above. c is the gap dimension between the second outer wall 25 and the second inner wall 27 described above.

On the other hand, as shown in Figure 13, after the cardboard sheet 20 rebounds, when the other end 52 of the reinforcing plate 5 is inserted into the second groove 8 until it abuts the second outer wall 25 and one end 51 of the reinforcing plate 5 abuts the first inner wall 24, the longitudinal length dimension g of the reinforcing plate 5 satisfies the relationship of the following equation (3).
g = i + a + b + c ... (3)
In the above formula (3), i is the degree of repulsion of the cardboard sheet 20 described above.

The above-mentioned repulsion degrees e, i and distances d, h satisfy the relationship of the following formula (4).
d:e=h:i ... (4)
From the above formulas (3) and (4), the longitudinal length g of the reinforcing plate 5 satisfies the relationship of the following formula (5).
g = eh / d + a + b + c ... (5)

Therefore, from the above equations (2) and (5), the distance h can be calculated from the following equation (6).
h = (e + f) × d / e ... (6)

[Effects of the embodiment]

According to the packaging body 1 of this embodiment, when disposing of the packaging body 1, the reinforcing plate 5 can be easily removed from the tray 2 by pulling out one end 51 and the other end 52 of the reinforcing plate 5 from the first groove 7 of the first inner wall 24 and the second groove 8 of the second inner wall 27, respectively. This makes it easy to separate and dispose of the reinforcing plate 5, which is made of a different material (wood) from the paper tray 2.

When assembling the packaging body 1, when one end 51 of the reinforcing plate 5 is pushed to the other side in the second direction while abutting against the first inner wall 24 and inserted into the first groove 7, the tongue portion 15 of the first inner wall 24 against which the one end 51 of the reinforcing plate 5 abuts tends to warp toward the first outer wall 22 due to the multiple slits 10. This allows the one end 51 of the reinforcing plate 5 to be easily inserted into the first groove 7.

The length dimension L of the slit 10 in the second direction is calculated using the above formula (1), so the length dimension L can be made as short as possible. As a result, damage to the first inner wall 24 caused by the slit 10 can be suppressed.

First and second chamfered portions 13, 14 are formed at the corners between the bottom surface 7c of the first groove 7 in the first inner wall 24 and the side surfaces 11b, 12b of each slit 10. As a result, when the side surfaces 11a, 11b (12a, 12b) of each slit 10 come into contact with each other, the contact area can be reduced by the amount of the first and second chamfered portions 13, 14. By reducing the contact area, the tongue portion 15 on the first inner wall 24 against which the one end 51 of the reinforcing plate 5 abuts becomes more likely to warp toward the first outer wall 22, so that the one end 51 of the reinforcing plate 5 can be more easily inserted into the first groove 7.

The first and second chamfered portions 13, 14 are R-chamfered, so compared to C-chamfered portions, the tongue portion 15 is more likely to warp toward the first outer wall 22. This makes it easier to insert one end 51 of the reinforcing plate 5 into the first groove 7.

[others]
The slits 10 are formed at one end and the other end of the bottom surface 7c of the first groove 7, respectively, but at least one may be formed at any position of the bottom surface 8c of the first groove 7. The length dimension L of the slit 10 is not limited to the calculation method of this embodiment, and may be set by other calculation methods. The slit 10 and the chamfered portions 13, 14 are formed near the first groove 7 of the first inner wall 24, but may be formed near the second groove 8 of the second inner wall 27. Two reinforcing plates 5 are arranged on the tray 2, but one or three or more reinforcing plates 5 may be arranged.

The description "first" for each of the outer wall 22, the connecting wall 23, the inner wall 24, and the groove 7, and the description "second" for each of the outer wall 25, the connecting wall 26, the inner wall 27, and the groove 8 are used to distinguish the words to which these descriptions are attached. Therefore, the terms "first" and "second" may be used in reverse.

The package 1 includes a pair of trays 2 (first tray 2A, second tray 2B), but it is sufficient to include at least one of the trays 2. The material of the package 1 is not limited to a paper cardboard sheet, but may also be a resin cardboard sheet. The packaged item 80 is not limited to a ceiling-suspended indoor unit, but may also be a wall-mounted, ceiling-embedded, or floor-standing indoor unit, or may be another item such as an outdoor unit.

The present disclosure is not limited to the above examples, but is intended to include all modifications within the scope and meaning of the claims.

REFERENCE SIGNS LIST 1 Package 2 Tray 5 Reinforcing plate 7 First groove 7c Bottom surface 8 Second groove 10 Slit 11 First slit 11b Side surface (one side surface)
12 Second slit 12b Side surface (one side surface)
13 First chamfered portion (chamfered portion)
14 Second chamfered portion (chamfered portion)
20: Cardboard sheet 20b: Folding curve (folding tip)
20e Folding curve (folding tip)
21 Flat portion 22 First outer wall 24 First inner wall 25 Second outer wall 27 Second inner wall 51 One end portion 52 Other end portion 80 Item to be packed 81 End surface (one surface)
82 End face (one side)
L Length dimension

Claims (5)

A tray (2) having a flat portion (21) for covering one side (81, 82) of an item (80) to be packed and made of a cardboard sheet (20);
A reinforcing plate (5) is disposed along the flat portion (21) and extends in a first direction;
The tray (2) is
a first outer wall (22) formed by folding the cardboard sheet (20) from one end of the flat portion (21) in the first direction to one side in a second direction perpendicular to the flat portion (21);
a second outer wall (25) formed by folding the cardboard sheet (20) from the other end of the flat portion (21) in the first direction to the one side in the second direction;
a first inner wall (24) disposed closer to the second outer wall (25) than the first outer wall (22) and formed by folding back the cardboard sheet (20) from the folded tip (20b) of the first outer wall (22) to the other side in the second direction;
a second inner wall (27) disposed closer to the first outer wall (22) than the second outer wall (25) and formed by folding back the cardboard sheet (20) from the folded tip (20e) of the second outer wall (25) to the other side in the second direction,
A first groove (7) that opens at the other end in the second direction is formed in the first inner wall (24) , and a slit (10) is cut out from a bottom surface (7c) of the first groove (7) toward the one side in the second direction,
A second groove (8) is formed in the second inner wall (27) and opens at the other end in the second direction,
One end (51) of the reinforcing plate (5) in the first direction is inserted into the first groove (7), and the other end (52) of the reinforcing plate (5) in the first direction is inserted into the second groove (8),
h is a distance in the second direction from a position where the one end (51) of the reinforcing plate (5) abuts against the first inner wall (24) to the flat portion (21) when the other end (52) of the reinforcing plate (5) is inserted into the second groove (8);
When the distance in the second direction from the bottom surface (7c) of the first groove (7) to the flat portion (21) is d,
The length dimension (L) of the slit (10) in the second direction is (hd) . 2. The packaging body according to claim 1, wherein the first inner wall (24) and the second inner wall (27) are inclined away from each other in the first direction from a perpendicular position relative to the flat portion (21) due to the repulsion of the cardboard sheet (20) . A plurality of the slits (10) are cut into the first inner wall (24),
The packaging body according to claim 1 or claim 2, wherein the plurality of slits (10) include a first slit (11) cut out from one end of the bottom surface (7c) and a second slit (12) cut out from the other end of the bottom surface (7c). A packaging body as described in any one of claims 1 to 3, wherein a chamfered portion (13, 14) is formed at a corner formed by the bottom surface (7c) of the first groove ( 7) in the first inner wall (24) and one side surface (11b, 12b) of the slit ( 10 ). The packaging body according to claim 4 , wherein the chamfered portions (13, 14) are R-chamfered.

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