JPH0748501Y2 - Packaging box - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging box made of cardboard or other cardboard.

2. Description of the Related Art For example, FIGS.
Some are configured as shown. Hereinafter, referring to the drawings, 1 is four side plates 2 to 5 and each side plate 2 to 2.
5 is a packaging box made of cardboard, which includes upper lid forming flaps 6 to 9 continuously provided at the upper end of 5 and bottom plate forming flaps 10 to 13 similarly provided at the lower ends of the side plates 2 to 5. The bottom plate forming flaps 10 to 13 of the packaging box 1 are assembled from the unfolded state shown in FIG. 5 as shown in FIGS. 6 and 7, and after the items to be stored are stored inside the packaging box 1. The upper lid forming flaps 6 to 9 are closed and sealed with a sealing adhesive tape or the like.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional packaging box having the above structure, the flap for forming the bottom plate is provided.
10 to 13 are assembled as shown in FIG. 6, FIG. 7 and FIG. 8, but the bottom plate forming flap is formed by dropping the packaging box 1 with the object to be stored inside the packaging box 1. Ten~
When an impact is applied to 13, the protrusion 11a of the flap 11 engages with the recess 13a of the flap 13 facing the protrusion 13b and the protrusion 13b of the flap 13 disengages with the recess 11b of the flap 11 opposing each other, and both sides There was a problem that the flaps 10 and 12 of the No. came out between the flaps 11 and 13 and the bottom came out.

The present invention solves such a problem, and an object thereof is to make it difficult for the bottom to come off even if a shock is applied to the bottom plate forming flap such as when the packaging box is dropped.

Means for Solving the Problem In order to solve the problem, the present invention uses cardboard and other thick paper as a material, and continuously connects bottom plate forming flaps 30 to 33 to the lower ends of four side plates 22 to 25. Of these flaps 30 to 33, the flap 33 that is folded first has a protrusion 33a at the center and recesses 33b on both sides thereof.
The flap 31 sandwiching the flaps 30 and 32 on both sides with the flap 33 has a recess 31a into which the projection 33a is fitted and engaged in the center.
And projections 31b which are fitted and engaged with the recess 33b are provided on both sides thereof, and the bottom of the recess 33b is formed by an arcuate bulge 33c.

By this configuration, since the bottom side of the recess 33b is formed by the arcuate bulge 33c, the engaging force between the recess 33b and the protrusion 31b, that is, the engaging force between the flap 31 and the flap 33 is increased, Even if a shock is applied to the bottom plate forming flaps 31 to 33 by dropping the packaging box with the object to be stored inside the packaging box, the bottom will not come off easily.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 21 denotes four side plates 22 to 25, and an upper lid forming flap 26 to the upper end of each side plate 22 to 25.
29, and bottom plate forming flaps 30 to 33 which are also continuously provided at the lower ends of the side plates 22 to 25, are packaging boxes made of corrugated cardboard, and the flaps 33 are folded first and the flaps on both sides are arranged from above. 30, 32 are folded, and a flap 31 facing the flap 33 is further folded from above to form a bottom plate. More specifically, the flap 33 is provided with a protrusion 33a in the center, and recesses 33b are formed on both sides thereof, and the flap 31 facing the flap 33 is formed with a recess 31a in which the protrusion 33a is fitted and engaged in the center. The projections 31b are provided on both sides thereof so as to be fitted and engaged in the recesses 33b, and the flaps 31 and 33 are engaged by the projections 33a and the recesses 31a and the projections 31b and the recesses 33b. However, the bottoms of the recesses 33b on both sides of the flap 33 are formed by arcuate bulges 33c, and the bulges 33c are provided to the outside (downward) of the protrusion 31b. The overlapping area is increased, and the flaps 31 and 33 can be firmly engaged with each other. Further, both sides of the flap 31 are formed by an arcuate bulge portion 31c obliquely between the corner portion of the packaging box 21 and the projection 31b. The area where the flaps 30 and 32 overlap with each other from the outside (downward) is increased, so that the flaps 31 and 32 can be firmly engaged with each other. The flaps 30 and 32 on both sides are overlapped on both sides of the flap 33 from outside (downward) and are on both sides of the flap 31 (upward).
And flaps 30 and 32 are flaps 31 and 33.
The engaging force between the flaps 31 and 33 is strengthened by being interposed between the projections 31a and 33, but the projections 30a and 32a overlapping the inside of the projection 31b are formed in the portion overlapping the inside of the flap 31. 31b and the concave portion 33b engaging force, that is, the flaps 31 and 33
The engaging force with and is further increased.

By the way, the flaps 26 to 29 for forming the upper lid are closed after the object to be stored is stored in the packaging box 21 and sealed with an adhesive tape or the like for sealing.

According to the embodiment described above, the engagement force between the flaps 31 and 33 and the flaps 31 and 30, 32 is increased, and the packaging box 21 drops with the object to be stored inside the packaging box 21. Even if an impact is applied to the bottom plate forming flaps 31 to 33, it is difficult for the bottom to come off.

Effect of the Invention According to the present invention as described above, even if a shock is applied to the bottom plate forming flap such as when the packaging box is dropped, the bottom is less likely to come off, and the strength can be increased.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
The figure is a development view of the packaging box, FIGS. 2 and 3 are perspective views seen from below showing the assembling order, FIG. 4 is a perspective view seen from above the state shown in FIG. 3, and FIGS. FIG. 8 shows a conventional example, and FIG. 5 is a development view of a packaging box, FIG. 6 and FIG.
FIG. 8 is a perspective view showing the assembly sequence as seen from below, and FIG. 8 is a perspective view showing the state shown in FIG. 7 as seen from above. 21 ... Packaging box, 22-25 ... Side plate, 26-29 ... Top lid forming flap, 30-33 ... Bottom plate forming flap, 30a ... Projection part, 31a ... Recessed part, 31b ... Projection part, 31c …… Bulging section, 3
2a ... projection, 33a ... projection, 33b ... recess, 33c ... expansion.

Claims (1)

[Scope of utility model registration request] 1. A bottom plate forming flap 30-which is made of cardboard or other cardboard and overlaps the lower ends of four side plates 22-25.
Of these flaps 30 to 33, the flap 33 to be folded first is provided with a protrusion 33a at the center and concave portions 33b on both sides thereof, and the flaps on both sides with the flap 33 are provided. The flaps 31 sandwiching 30, 32 are provided with a recess 31a into which the projection 33a is fitted and engaged, and projections 31b which are fitted into and engaged with the recess 33b on both sides thereof, and the bottom of the recess 33b is arcuate. A packaging box formed by the bulge portion 33c.