JPH0948433A - Collapsible box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the load-resisting capacity of a box while making use of the light weight and durability of a plastic cardboard, by adding a reinforcing frame to a freely rotatable side boards. SOLUTION: This box is constituted of the bottom plate and four side plates. At least two sheets 3, 3 oppositely positioned are made of a plastic cardboard and made freely movable toward the inside of the box around the edge 14a and the rest two side sheets are made vertically collapsible like a folding screen. The freely rotatable side plate 3 is formed to have a nearly H-shaped section with a cut-off part 18 provided to cross at right angles against the bottom side, two vertical plates 22a, 22a, and a lateral plate connecting these vertical plates. And a reinforcing frame 22 wherein fitting grooves 22c in which the side plates 3 can be fitted, are formed at both sides, is added thereto. The edges of the cut-off part 18 are fitted and fixed to both fitting grooves 22c of the reinforcing frame 22 to connect the cut-off part 18 with the reinforcing frame 22 and strengthen the side plates 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box that can be folded into a compact flat shape from the container shape when in use.

[0002]

2. Description of the Related Art Conventionally, there is one bottom plate and four side plates,
Of the side plates, two facing side plates are rotatable inside the box around the upper edge as a bending center, and the remaining two side plates have a so-called folding screen folding structure and are bendable in the height direction. A foldable box which is a plastic cardboard is disclosed in, for example, Japanese Patent Laid-Open No. 6-135440. This foldable box, when assembled from a flat folded state to a use state, lifts the upper edge of the box to vertically raise the side plate of the folding screen folding structure and raise the remaining two side plates, and the side edges of the side plate. The folding part of the side plate of the folding screen was locked from the inside.

[0003]

The above-mentioned conventional box is light because it is made of plastic corrugated cardboard, and has an advantage that it can be used repeatedly as many times as paper corrugated cardboard, but it has a strong handicap. Therefore, it is not suitable for carrying heavy machine parts and the like, and there is a problem that the range of use is relatively narrow.

The present invention has been made in view of the above, and an object thereof is to provide a foldable box having both the lightness of a plastic cardboard and the strength capable of withstanding a large vertical load.

[0005]

In order to achieve the above-mentioned object, the present invention has a bottom plate and four side plates, and at least two of the side plates facing each other are made of plastic corrugated cardboard and have edges. A foldable box in which the remaining two side plates are rotatable inside the box as a center of bending, and the remaining two side plates can be bent in the height direction as a so-called folding screen structure. A cutting portion provided in a direction orthogonal to each other, two vertical plates and a horizontal plate connecting the two vertical plates are formed into a substantially H-shaped cross section, and the fitting grooves into which the side plates can be fitted are opened on both sides. A foldable box in which the edges of the cut portions are fitted and fixed to both fitting grooves of the reinforcement frame so that the cut portions are connected to each other.

Further, more preferably, reinforcing molding members are fitted to both side edges of the rotatable side plate.

As mentioned above, a reinforcing frame is attached to the side plate, or
By fitting the reinforcing frame and the reinforcing molding member, the axial compressive strength of the side plate is dramatically improved. Therefore, since the load bearing capacity of the box is increased, the range of use of the box is expanded.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view of the box, and FIG.
Is a perspective view of the box showing a folded state, and FIG. 3 is X- of FIG.
X-ray end view, FIG. 4 shows Y- of FIG. 1 including enlarged portion Z2 of Z1
End views of the Y line, FIGS. 5A and 5B are partially enlarged sectional views of the box, FIG. 6 is a perspective view of the bottom plate, FIG. 7 is an exploded perspective view showing a side plate on the rotation side, and FIG. 9 is an exploded perspective view showing a side plate having a folding screen folding structure. FIG.

The box 1 has a rectangular bottom plate 2 in plan view, two rotatable side plates 3 and 3 located on two opposite sides of the bottom plate 2, and the remaining two sides of the bottom plate 2. The two side plates 4 and 4 having a folding screen structure, the molding members 5a to 5c that cover the ends of the side plates 3 and 4, and the corner members 6 that connect the side plates 3 and 4 and the handles provided to the side plate 3. And the member 7.

The material forming the bottom plate 2 and the side plates 3 and 4 is a well-known plastic corrugated board in which a polypropylene core member 8c is integrally formed between two polypropylene substrates 8a and 8b. As shown in FIG. 6, the bottom plate 2 has fixed vertical plates 9 formed at both ends in a direction orthogonal to the core member 8c. The vertical plate 9 is obtained by thermally deforming the both ends of the bottom plate 2 at a right angle, and has a long hole-like locking portion 10 in which two sets are arranged on the left and right sides and two columns are formed on the upper and lower sides in total. , 10 ...

The side plate 3 has a core member 8c, as shown in FIG.
Is used in a vertical direction, and a bent piece 13 is folded and stacked on the upper end as shown in the enlarged portion Z2 of FIG. A molding member 5a having a U-shaped cross section is fitted in. Further, reinforcing molding members 5b made of synthetic resin and having a U-shaped cross section are fitted to both side edges of the side plate 3. In the portion where the two pieces are folded by the bending piece 13, the notch recess 2 is formed at the center.
1 is formed, and the handle member 7 is fitted into the cutout recess 21. In addition, an inner folding curve 14a is formed at the upper end of the side plate 3 along the lower edge of the molding member 5a, leaving a single substrate 8b, and the remaining substrate 8b serves as a hinge portion to form the side plate. 3 rotates toward the inside of the box 1.
On the other hand, at the lower edge of the side plate 3, a reinforcing band 11 is provided in a direction orthogonal to the core member 8c. Reinforcing band 11 of this embodiment
Has a lower end bent substantially at a right angle in the same manner as the vertical plate 9 of the bottom plate 2. In addition, as shown in FIG.
As shown in (b) and FIG. 7, a protruding piece-like engaging portion 12, which engages with the lower engaging portion 10, 10 of the vertical plate 9 of the bottom plate 2,
12 are formed.

As shown in FIGS. 5 (a) and 5 (b), the handle member 7 has a crank shape in cross section. The upper part of the crank is the insertion part 15 and the lower part is the inward claw pieces 16, 16. The finger hooks 17 are provided at both ends. The handle member 7 is fixed by fitting the insertion portion 15 into the cutout recess 21 of the side plate 3 and further heat-sealing the molding member 5a and the insertion portion 15.

Thus, as shown in FIG. 7, the side plate 3 has a cutting portion 18 cut along the center line in the vertical direction. The cut portion 18 is formed from the end of the cutout recess 21 to a position just before the reinforcement band 11, and the side plate 3 is not divided by the reinforcement band 11 and maintains a single sheet form. The side plate 3 may be formed by vertically cutting the cutting portion 18 so as to be completely divided into two parts.
It is preferable in terms of strength of the reinforcing belt 11 to stop 8 at a position just before the reinforcing belt 11.

The cutting portion 18 is connected by an H-shaped reinforcing frame 22 as shown in FIGS. That is, as shown in FIG. 8, the reinforcing frame 22 is formed by two vertical plates 22a and a horizontal plate 22b connecting the both vertical plates 22a to have an H-shaped cross section, and the side plates 3 can be fitted on both sides. The fitting grooves 22c, 22c are opened, the edges of the cutting portion 18 are fitted into the fitting grooves 22c, 22c, and the tack 23 is driven from the outside of the reinforcing frame 22 to be integrated with the side plate 3. The reinforcing frame 22 connects the cut portions 18 together.

Next, as shown in FIG. 9, the side plate 4 having a folding screen structure is made of plastic corrugated material with the core member 8c oriented in the vertical direction. The reinforcing plate 19 overlaps the bottom plate 2 below. The two side plates 4 and 4 are integrally connected via the. At the upper edge of the side plate 4, molding members 5c, 5
c is fitted, and an inner folding curve 14b is formed along the outer lower edge of the molding member 5c. The inward folding curve 14b is cut by leaving a single inner substrate 8b of plastic corrugated board, and the remaining inner substrate 8b serves as a hinge portion. An inner folding curve 14c having the same structure as the inner folding curve 14b has a side plate 4 and the reinforcing plate 1.
It is formed at the boundary with 9. Further, the side plate 4 is further provided with a horizontal outer folding curve 14 formed by cutting a single outer substrate 8a at the center of the inner folding curves 14b and 14c.
d is formed. The side plate 4 configured as described above is
The bottom plate 2 is connected to the bottom plate 2 by adhering a reinforcing plate 19 to the bottom surface of the bottom plate 2. The side plates 3 are arranged on the two sides of the bottom plate 2 on which the vertical plates 9 are provided, and the corner members 6 are fitted in the abutting portions of the side plates 4 to fix the rivets, so that the uppermost inward folding curve is formed. It is integrally connected to the side plate 4 at a portion above 14a and 14b.

On the side plate 4 of the folding screen folding structure, a semi-doughnut-shaped hooking portion 20 made of synthetic resin is heat-sealed on the outer surface and above the outer folding curve 14d. The hook 2
In No. 0, only the linear upper half part is heat-sealed, and the arc-shaped lower half part can be freely turned. The side plate 4 can be pulled outward by placing a finger on the lower half part. The hook 2
0 is not limited to the structure in which the synthetic resin parts are heat-sealed. For example, the hook 20 may be punched in the side plate 4 in the form of a through hole. Further, the attachment position of the hooking portion 20 may be below the outer folding curve 14d.

Next, the method of folding and assembling the box of the present invention will be described. First, in the state where the box 1 is flatly folded as shown in FIG. 2, the side plates 4 and 4 are folded in two and the upper surface of one side plate 4 is overlapped with the other side plate 4 as shown by the chain double-dashed line in FIG. Further, the side plates 3 and 3 are folded on the side plates 4 and 4 in a state as shown by the alternate long and short dash line in FIG.
Further, the inward claw pieces 16, 16 of the handle member 7 are engaged with the upper engagement portions 10, 10 of the bottom plate 2. Box 1 from this state
1 is assembled into the state shown in FIG. 1, first, the handle member 7 of the box 1 is opened to the outside and lifted up. Then, the inward claw pieces 16, 16 of the handle member 7 are disengaged from the upper engaging portions 10, 10 of the bottom plate 2, the bottom plate 2 is lowered, and the side plates 4, 4 are slightly extended. In this state, when a finger is hooked on the hook portion 20 of the side plates 4 and 4 and pulled outward, the side plates 4 and 4 stand upright. As a result, the side plates 3 and 3 that have lost their support stand up by their own weight, and the molding member 5b of the side plates 3 and 3 comes into contact with the inside of the outer folding curve 14d of the side plates 4 and 4 so that the side plates 4 and 4 are straightened. Lock it. Then, the engaging portion 1 of the side plates 3 and 3
When the boxes 2 and 12 are inserted into the lower engaging portions 10 of the vertical plate 9 of the bottom plate 2, the box 1 is assembled as shown in FIG.

In this state, as shown in FIG. 5B, the engaging portion 12 of the side plate 3 is engaged with the lower engaging portion 10 of the vertical plate 9.
Since the side plate 3 suspends and supports a part of the load applied to the bottom plate 2 because it is engaged with, it does not break even if a heavy load is put into the box 1 and lifted. As is well known, the plastic corrugated cardboard exerts excellent strength against a force acting in a direction parallel to the core member 8c. In the box 1 of the present invention, since the side plates 3 and 4 are formed so that the core member 8c is vertical and the side plate 3 is provided with the reinforcing frame 22 and the reinforcing molding member 5b,
It will not collapse even if a considerable vertical load is applied to the box 1. According to the experiment, as compared with the conventional box 1 which does not use either the reinforcing frame 22 or the reinforcing molding member 5b, by adding the reinforcing molding member 5b to the side plate 3, the maximum load that can be applied on the box is 200 kg. Was doubled to 400 kg, and by adding the reinforcing frame 22 to this, it was improved to 750 kg. Therefore, the boxes 1 containing heavy luggage can be stacked in multiple layers. Further, as in the present embodiment, if the bottom plate 2 and the core members 8c of the reinforcing plate 19 are stacked so as to be orthogonal to each other, the strength of the box bottom is also satisfactory.

Next, when folding from the assembled state to the flat state, first, the side plates 3 are rotated inside the box 1 as indicated by the alternate long and short dash line in FIG. Then, the side plates 4 and 4 having the folding screen folding structure are released from the lock and naturally bend from the inner folding (outer folding) folding curves 14b to 14d, so that if they are pressed as they are, they can be folded into a flat state as shown in FIG. Then, when the molding member 5a of the side plates 4 and 4 is further pushed in from above, the inwardly facing claw pieces 16 and 16 of the handle member 7 are fitted into the upper locking portions 10 and 10 of the vertical plate 9 of the bottom plate 2 and are stabilized.

Although the embodiments of the present invention have been described above, of course, the present invention is not limited to such embodiments. For example, a plurality of the reinforcing frames 22 may be provided, and the number of bends of the side plates 4 and 4 of the folding screen structure may be any number. Further, although the box of the embodiment is illustrated as being relatively deep, the box may be shallow so that the side plates 4 and 4 that are bent in the folded state do not overlap each other. In addition, the reinforcing frame 22 also includes a mode in which a plurality of horizontal plates 22b are provided.

[0021]

The foldable box of the present invention has a simple structure in which the reinforcing frame or the reinforcing frame and the reinforcing molding member is added to the rotatable side plate, and has the advantages of lightweight and durability of the plastic corrugated board. The load-bearing performance of the box can be dramatically improved while keeping it alive. Therefore, the foldable box using the plastic corrugated board has an excellent effect that it is possible to expand the use.

[Brief description of drawings]

FIG. 1 is a perspective view of a box.

FIG. 2 is a perspective view of the box showing a folded state.

FIG. 3 is an end view taken along line XX of FIG.

4 is an end view taken along line YY of FIG. 1 including an enlarged portion Z2 of Z1.

5 (a) and 5 (b) are partially enlarged sectional views of a box.

FIG. 6 is a perspective view of a bottom plate.

FIG. 7 is an exploded perspective view showing a side plate on a rotating side.

FIG. 8 is a cross-sectional plan view of an essential part showing a side plate on a rotating side.

FIG. 9 is an exploded perspective view showing a side plate having a folding screen structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Box 2 ... Bottom plate 3,3 ... Rotatable side plate 4, 4 ... Side plate of folding screen 5b ... Reinforcing molding member 18 ... Cutting part 22 ... Reinforcing frame 22a ... Vertical plate 22b ... Horizontal plate 22c ... Fitting groove

Claims (2)

[Claims] 1. A bottom plate and four side plates, at least two of the side plates facing each other are formed of a plastic corrugated board, and are rotatable inside the box with an edge as a bending center. In a foldable box in which the side plates are so-called folding screen folding structure and can be bent in the height direction, a cut portion provided in the rotatable side plate in a direction orthogonal to the bottom side, and two vertical plates. A reinforcing frame formed by forming a plate and a horizontal plate connecting the both vertical plates into a substantially H-shaped cross section and opening fitting grooves into which the side plates can be fitted is opened on both sides. A foldable box, characterized in that the cut portions are joined together by a reinforcing frame by fitting and fixing the edges of the cut portions in a mating groove. 2. The foldable box according to claim 1, wherein reinforcing mold members are fitted to both side edges of the rotatable side plate.