JPS6333787Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to foldable packaging boxes, such as cardboard boxes.

Conventional Structure and Problems Generally, this type of packaging box has a corner reinforcement/upper box holder 2 attached to the corner of the box 1 as shown in Fig. 1, and a U-shaped cross-sectional rim protector on the rim. material 3
are fitted together. Note that 4 in the figure is a handle.

By the way, the box 1 is folded flat as shown in FIG. 2 when the empty box is transported or stored. When the box 1 is folded, it restores its original shape, making it difficult to fold the box 1 thinly. Of course, when the folded boxes 1 are stacked, there is a problem that the boxes become bulky and the stacked boxes at the top tend to shift.

Purpose of the invention The present invention takes into consideration the above-mentioned conventional problems and aims to provide a packaging box that makes a folded box flat and stable.

Structure of the invention In order to achieve the above-mentioned object, the present invention is a box made of cardboard or the like with an open top, and a protective material having a U-shaped cross section is attached to the upper edge of two corresponding side plates. A packaging box in which, when the box body is flattened, the two protective members are engaged with each other to maintain the flat state by slidably fitting fasteners each having a U-shaped cross section into the two protective members. It is structured as follows.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

In the figure, reference numerals 5 and 5' denote a pair of corresponding side plates of a packaging box made of corrugated cardboard, and protective members 6 and 6' each having a U-shaped cross section are fitted onto the upper edges thereof. The ends of the protective members 6, 6' are held down at the corners of the box by corner retainers 12 (see FIG. 5). Further, the protective members 6, 6' have lower surfaces 6a of both sides inclined inward,
A V-shaped recess is formed with the side plates 5 and 5'. U-shaped stops 7 and 7' are fitted onto the outside of the protective members 6 and 6', respectively. The stoppers 7, 7' have claws 8 folded inward at the lower portions of both side pieces,
The claws 8 are engaged with the inclined lower surfaces 6a of the protective members 6, 6' to prevent them from coming off, and the stoppers 7, 7' are slidable using the protective members 6, 6' as slide guides. Said stopper 7, 7'
A U-shaped locking member 9 is provided on the inner side of one of the stoppers 7, and a locking recess 10 is provided on one side of the locking member 9. Further, a headed engagement protrusion 11 is provided on the inner side of the other stopper 7'. The protective members 6, 6' and the stoppers 7, 7' are made of synthetic resin such as polypropylene.

In the configuration of the packaging box described above, the packaging box is
When folded flat for transportation or storage as shown in the figure, the two fasteners 7 and 7' are attached to the protective material 6,
6' so that they correspond to each other, and insert the locking recess 10 of one stopper 7 into the other stopper 7'.
The engagement protrusion 11 causes the engagement. Therefore, even if the corner retainer 12 attempts to restore its original position, the corresponding side plates 5, 5' are stopped by the stoppers 7, 7', and the folded packaging box is kept in a stable flat state.

Incidentally, when the packaging box is used, the stops 7, 7' may be removed. Further, the protective members 6, 6' may be fixed by adhesive or the like instead of using the corner reinforcing member 12. Further, the locking structure may be a hook structure in addition to the recess and the headed projection, and is not limited to the structure of the illustrated embodiment.

Effects of the invention As is clear from the description of the above embodiments, the packaging box of the invention is stable in its folded state.
In addition, the stopper that maintains the folded state can be easily attached and removed, and it can be easily slid to a desired position and engaged with a corresponding stopper, which has a great practical effect. .

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional packaging box, Figure 2 is a perspective view of the same packaging box in a folded state, Figure 3 is a perspective view of the main parts of the packaging box of the present invention, and Figure 4 is a perspective view of the same packaging box. A perspective view of the stopper, and FIG. 5 is a perspective view of the packaging box in a folded state. 5, 5'... Side plate of the packaging box, 6, 6'... Protective material, 7, 7'... Stopper, 12... Corner reinforcing tool.

Claims (1)

[Claims for Utility Model Registration] (1) Protective materials each having a U-shaped cross section are attached to the upper edges of opposing side plates of a box body made of cardboard or the like with an opening at the top, and a U-shaped cross-sectional material is attached to the outside of each of the two protective materials. A packaging box in which two stoppers are slidably fitted together, and the two fasteners are configured to be able to freely engage with each other. (2) The protective material has a sloped surface on the lower surface of both sides so as to form a V-shaped recess with the side plate, and the stopper has a claw at the bottom of both sides that engages with the sloped surface. The packaging box described in item 1. (3) One of the two fasteners has a U-shaped locking member on its inner side, and a recess for locking is provided on one side of the locking member, and the other of the fasteners has a U-shaped locking member on one side of the locking member. The packaging box according to claim 1, which is a registered utility model and has a headed engagement protrusion on the inner side that engages with the recess.