JPS629213Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a case formed of a corrugated cardboard sheet.

If the ruled lines of the outer flap and inner flap of a case made of a corrugated cardboard sheet were provided at the same level, there was a problem that the outer flap could not be folded smoothly during the sealing operation.

Therefore, it is already known that a step is provided between the ruled line of the outer flap and the ruled line of the inner flap in consideration of the thickness of the seal so that the sealing operation can be carried out smoothly.

According to this type, the compressive strength against a downward load is significantly reduced. That is, at the beginning of the application of the downward load, since there is a step in the ruled line, the downward load is not applied evenly to the four side walls, but acts concentratedly only on the high side wall. At this time, the low sidewall receives relatively little load from the high sidewall due to the collapse of the flaps connected to it, and as a result, a buckling line is created in the high sidewall, causing deformation, and the strength of the sidewall is reduced. is significantly lowered and then acts on the lower sidewalls, so
This is because, as described above, a buckling line enters the wall and causes deformation, and each side wall does not receive the same downward load at the same time.

The purpose of this invention is to solve the above-mentioned problems by allowing smooth sealing work and preventing the compressive strength against downward loads from decreasing.

This idea is to provide the ruled lines of each flap at the same level, and also to provide a ruled line parallel to the above ruled line on the outer flap to escape the thickness of the corrugated sheet as it is folded.These two ruled lines make the sealing process easier. To provide a case with improved pressure resistance by simultaneously applying a load to each side wall.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

In the figure, A is a case formed using a corrugated cardboard sheet.

In the illustrated case, the above case A includes a rectangular tube 1, a bottom wall 2 continuous from the lower edge of the opposite short side wall of the rectangular tube 1 and the lower edge of the opposite long side wall, and the opposite short side wall. Inner flaps 3, 3 that extend from the upper edge of
and outer flaps 4, 4 which are connected from the upper edges of opposing long side walls and overlapped, but alternatively, the opposing edges of the outer flaps 4, 4 may be brought into contact with each other, or the flaps of the four side walls may be overlapped one after another. It may be of any format.

The bottom wall 2 is designed to form a bottom with one touch when each side (long side wall and short side wall) of the rectangular tube 1 folded flat is raised. The flap may be folded in.

Furthermore, the ruled lines 5 of the inner flaps 3, 3 and the outer flaps 4, 4 are provided at the same level, and the outer flaps 4, 4 are provided with the thickness of the previously bent flaps to form the ruled line 5. Parallel auxiliary ruled lines 6 are provided.

Note that the space between the ruled line 5 and the auxiliary ruled line 6 may be flattened, or a wide ruled line (not shown) may be used instead of the ruled line 5 and the auxiliary ruled line 6.

In addition, in the case of sealing by overlapping the outer flaps 4, 4 as shown in the figure, the inner and outer flaps 4
The interval between the ruled lines 5 and 6 on the outer flap 4 is larger than the interval between the ruled lines 5 and 6 on the outside flap 4.

In the figure, 7 is a sealing piece.

As described above, according to the case according to this invention, the flaps connected to each of the four rectangular cylindrical side walls of the case are provided with ruled lines at the same level, and the inner flaps that precede the flaps in the folding order of the flaps are provided with ruled lines. Since auxiliary ruled lines are provided parallel to the ruled lines that allow thickness to escape to the subsequent outer flap, the outer flap can be sealed smoothly without being affected by the inner flap.

In addition, when a downward load is applied, the parts narrowed by the ruled lines and auxiliary ruled lines are likely to collapse, and each side wall of the rectangular tube is at the same height due to the ruled lines at the same level.
Since a substantially uniform force is applied to each side wall at the same time, the disadvantage that a strong compressive force is applied to a particular side wall and each side wall is sequentially deformed by a buckling line is eliminated.

This results in a significant increase in strength.

[Brief explanation of the drawing]

Figure 1 is a developed plan view of the case related to this invention.
FIG. 2 is a perspective view of the case, FIG. 3 is a longitudinal sectional front view when sealed, and FIG. 4 is an enlarged longitudinal sectional front view of the same. A...Case, 1...Square tube, 2...Bottom wall, 3,
3...Inner flap, 4,4...Outer flap, 5...
... ruled line, 6... ruled line.

Claims (1)

[Scope of utility model registration request] The flaps connected to each of the four rectangular cylindrical side walls of the case formed by a corrugated cardboard sheet are provided with ruled lines at the same level, and in the folding order of these flaps, the inner flap is placed on the preceding inner flap and the subsequent outer flap is placed on the inner flap. A case in which an auxiliary ruled line is provided parallel to the ruled line for escaping the thickness of the case.