JPH0320250Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to plastic cardboard boxes used for storing and transporting lightweight industrial products, semi-finished products, parts, agricultural products, seafood, etc. This invention relates to a plastic cardboard box that has been improved to have a structure with high strength and rigidity.

Conventional technology (1) Conventional general plastic cardboard boxes are
As illustrated in Fig. 7, side walls b and c are bent and erected around the four circumferences of the bottom plate a of a plastic corrugated sheet cut into an unfolded state, and formed at both ends of the short side wall c, similar to a normal paper box. It is assembled by bringing the connecting flap d into contact with the inside of the longitudinal side wall b and securing it with a stapler e (as shown in Figure 2 of Japanese Utility Model Publication No. 55-46633).

(2) The plastic cardboard box shown in Fig. 18 is also described in Japanese Utility Model Publication No. 55-46633, and the long side wall b' is folded inward to form a double wall structure. The structure is such that the side walls are reinforced and stiffened, and the disadvantage of exposing the sharp cut edges of the cardboard sheet at the upper edge of the opening of the box is solved.

(3) The plastic cardboard box shown in Fig. 19 is described in Japanese Utility Model Application Publication No. 56-138038, and a cross-sectional reinforcing frame f is attached to the upper edge of the opening of the box, and corners are attached to the four corners. Attach member g,
The upper edge of the opening and the four corners of the box are reinforced and stiffened, and the structure prevents the inconvenience of exposing sharp cuts of the cardboard sheet at the opening edge.

Problems to be Solved by the Invention (2) The disadvantages of plastic corrugated boxes are that their strength and rigidity are relatively low, and that sharp cuts are exposed at the edges of the corrugated sheets, which can cause damage to the handler's hands, etc. The problem is that it is easy to get hurt.

In particular, cardboard boxes are always stacked to a sufficient extent when storing or transporting the items contained therein. Since the strength and rigidity of the side walls against the vertical load (load) at that time are not very high, it has not been possible to stack many boxes in the past, and even if stacked with care, the boxes are likely to be deformed or damaged.

() In addition, the bent corners where the bottom plate a of the box changes to the side walls b and c (the area surrounded by circle A in Figure 19) have many chances to hit surrounding objects during handling, and are easily damaged. It was. In particular, the degree of damage was severe when pressing force was applied near the bottom of the box.

() The bottom four corners of the box were relatively weak and easily damaged.

() The cardboard box in Figure 18 has long side walls.
b' has a double wall structure, and the cardboard box shown in Fig. 19 has a reinforcing frame f attached to the upper edge of the side wall opening and a corner member g attached for reinforcement and stiffness, but it is still not sufficient. It cannot be said that it is strong enough. For this reason, when storing an article and carrying it by grasping the handle, the long side wall b often deforms so as to bulge outward. Further, due to the repetition of such deformation, the integrated structure of the reinforcing frame f, the corner member g, and the side wall of the box is damaged, resulting in rattling, which causes a problem in that the reinforcing effect is lost.

() In the cardboard boxes shown in Fig. 17, the overlap margin is small, so it is difficult to stack them stably on the same plane. On the other hand, although boxes with corner members g attached as shown in Fig. 19 are easy to stack and are stable, there is always a gap equivalent to the thickness of the corner member g between the stacked upper and lower boxes. ,
There was also a problem in that dust and other foreign matter entered through this gap, causing the stored articles to become dirty.

Means for Solving the Problems As a means for solving the problems of the prior art described above, the plastic cardboard box according to the present invention has the following preferred embodiments as shown in FIGS. 1 to 16 of the drawings. In a plastic cardboard box assembled by folding plastic cardboard sheets, the four circumferences of the bottom plate 1 are folded inward by a certain distance, the side walls 2 and 3 are made to stand upright, and the folded parts are folded back into the bottom plate 1.
The bottom flange 4 is formed to protrude parallel to the bottom flange 4.

In addition, at the four corners of the box, adjacent side wall plates 2,
A reinforcing frame 5 in which an inner flap 3a formed on one edge of the wall plate in 3 is rolled up and overlapped with an outer flap 2a formed on the edge of the other wall plate.
was formed vertically.

As a more specific embodiment, the bottom positions of the four corners of the cardboard box are reinforced by attaching three-sided corner members 7 (FIG. 8) that clamp the two sides of the bottom flanges 4 and reinforcing frame 5 together.

In addition, the opening edge of the side wall of the cardboard box can be reinforced by attaching a reinforcing frame material 11 in the form of a tube or rod (Fig. 9), or a corrugated sheet can be placed outside the opening edge of the side wall of the cardboard box by a certain dimension. The opening flange 8 is formed by bending it in a substantially horizontal direction and then folding the end inward (FIG. 11).

Corrugated sheet 27' folded inward to form an opening flange 8 in the side wall of the corrugated box
(Fig. 11) is further bent along the outer surface of the side walls 2, 3 to reach the lower bottom flange 4 (see reference numeral 2' in Figs. 1 and 3) to reinforce the side walls 2 or 3. .

Alternatively, a reinforcing material 34 made of a plastic corrugated sheet having reinforcing ribs 33 is integrally attached to the outer surfaces of the side walls 2 and 3 of the corrugated box for reinforcement (FIG. 13).

Function: The bottom of the box is reinforced and stiffened by the bottom flanges 4 formed around the four sides of the bottom plate 1, so it is strong against impact or pressing force (external force) applied near the bottom of the box, and has excellent durability. .

In particular, if the box hits something nearby during handling, the bottom flange 4 will collide first, so the bottom plate 1
There is no possibility that the side walls 2 and 3 will be directly damaged.

Furthermore, when the boxes are stacked, the bottom flange 4 acts like an eaves that protrudes horizontally over the gap between the upper and lower boxes, thereby preventing dust and other foreign matter from entering the bottom from the gap. .

The vertical reinforcing frames 5 provided at the four corners of the boxes increase the strength and rigidity against the load when stacking boxes, making it possible to stack many boxes, and preventing deformation or damage of the boxes due to such stacking. prevent.

Furthermore, even if the four corners of the box collide with surrounding objects while handling the box, the reinforcing frame 5 will first collide and the side wall plates 2 and 3 will not be directly damaged and damaged.

In addition, the reinforcing frame 5 increases the rigidity of the side wall plates 2 and 3 of the box, so that it prevents deformation of the side wall plates when storing items in the box and carrying them by gripping the handles, especially on the side walls 2 on the long sides.
Suppresses deformation that causes outward expansion.

Embodiment The plastic corrugated cardboard box shown in FIG. 1 is made by folding and assembling cut plastic corrugated sheets as shown in the exploded view of FIG. 2.

That is, side wall plates 2 and 3 are erected around the four circumferences of the bottom plate 1.
First, the first folding walls 11 and 12 (FIG. 2) are folded inward. Next, the first bending line 1
A second bending line 11', 1 is formed parallel to the outside of 1, 12 with an interval of about 30 to 50 mm.
2' (FIG. 2) is bent and the side walls 2 and 3 are erected vertically, thereby assembling the planar cardboard box side wall shown in dotted lines in FIG.

The first and second bending lines 11 and 11' or 1
The interval dimension (30 to 50 mm) between 2 and 12' is the bottom flange 4 that protrudes parallel to the bottom plate 1 as a folded part.
(Figure 3). The folded portion that becomes the bottom flange 4 is integrally joined by adhesive, welding, staples, or the like.
The area around the bottom of the box is reinforced and stiffened by this bottom flange 4.

Regarding the side wall 2 on the long side, a second side wall plate 2' is connected via a bending line 13 at the upper edge of the opening (Fig. 2), and this is connected to the outside from the bending line 13. After being folded back, it is integrally attached to the side wall plate 2 by gluing, welding, staples, or the like. In this way, the side wall 2 on the long side is
The sharp cut edge of the corrugated cardboard sheet is not exposed at the upper edge of the opening, and it is formed into a double-layered structure with high strength and rigidity (Fig. 3).

Next, a middle flap 3a is connected to both ends of the side wall plate 3 on the short side via a bending line 14 (Fig. 2),
This middle flap 3a is bent outward at a right angle so as to be inscribed inside the longitudinal side wall 2 (FIG. 4).

On the other hand, outer flaps 2a are connected to both ends of the second longitudinal side wall plate 2' via bending lines 16. The outer flap 2a is rolled up from the outside so that the middle flap 3a serves as the center core (Fig. 4), and the entire four-layered sheet is then glued, welded, stapled, etc. The reinforcing frame 5 is formed by integrally joining the reinforcing frame 5. The reinforcing frame 5 is formed at the four corners of the box and extends over the entire vertical height of the box.

This reinforcing frame 5 allows for assembly by joining the long and short side walls 2 and 3, and for reinforcing and stiffening the four corners of the box, particularly improving the load resistance against vertical loads. Furthermore, the structure is such that the sharp edges of the cardboard sheet are not exposed in the vertical direction at the four corners of the box (Figure 4).

Second Embodiment The plastic corrugated cardboard box shown in FIG. 5 is assembled by folding plastic corrugated sheets cut as shown in the developed view of FIG. 6.

The cardboard box of this example has four corner reinforcing frames 5.
are each formed in a 45° direction. That is, the projecting pieces 2 at both ends of the side wall plate 2 on the long side
a' are connected via the bending line 15 (Fig. 6),
The bending line 15 is bent at an angle of 45° (Fig. 7).

By the way, as a means of tightly forming the reinforcing frame 5 in the 45° direction, the center angle is set at the lower end of the protrusion 2a' at both ends of the side wall plate 2 on the longitudinal side via the bending line 17.
A 45° sector-shaped piece 18 is connected. Similarly, a sector-shaped piece 20 having a center angle of 45 degrees is connected to the lower end of the middle flap 3a at both ends of the short side wall plate 3 via a bending line 19 (FIG. 6).

When assembling the reinforcing frame 5, the two types of fan-shaped pieces 18 and 20 are bent at the bending lines 17 and 19, respectively.
It is bent outward at right angles from the base plate 1, and abuts on the 90° fan-shaped portions 21 formed at the four corners of the bottom plate 1, and is fixed by adhesive, welding, staples, or the like.

As a result of the reinforcing frame 5 being formed in the 45° direction, the reinforcing frame 5 exerts reinforcing and stiffening effects equally in the two right-angled directions of the long and short sides of the box.

In order to reinforce the four corner bottoms of the box, it is convenient to use three-sided corner members 7 that fit in common with the reinforcing frame 5 and the bottom flanges 4, 4 in two right-angled directions intersecting with the reinforcing frame 5, as shown in FIG. It is.

Third Embodiment The plastic cardboard box shown in FIG. 9 is characterized by a structure in which a tubular reinforcing frame member 11 is attached to the opening edge of the cardboard box shown in FIG.

That is, the socket 24 is formed by coating the outer periphery of the thin-walled steel pipe 22 with a thin and uniform layer of synthetic resin 23, and sandwiching the upper edge of the side wall 2 or 3 with the coating resin 23.
(Fig. 10) is integrally formed with an outer diameter of φ28 to φ32.
A resin-coated metal tube 11a is used. The resin-coated metal tube 11a is attached by fitting its socket 24 into the upper edge of the side wall 2 or 3 (FIG. 10),
It is fixed by means such as adhesion or welding.

On the other hand, at the four corners of the box, there are corner joints 11 that are integrally injection-molded with sockets made of synthetic resin.
b is attached, the resin-coated metal tube 11a is joined to the corner joint 11b, and the reinforcing frame material 11 is completed.

In this way, the reinforcing frame material 11 is integrally joined to the upper edge of the opening of the cardboard box, so the reinforcing frame material 11
1 greatly reinforces and stiffens the upper edge of the box opening. Therefore, the reinforcing frame member 11 prevents the side walls 2, 2 on the long sides from being deformed such that the long side walls 2, 2, in particular, bulge outward when an item is stored in the box and carried by gripping the handle.

Fourth Embodiment The plastic cardboard box shown in FIG.
Corrugated cardboard sheets cut into a developed view as shown in FIG. 12 are folded and assembled.

The characteristic of this cardboard box is that the width is 30 to
The first flaps 27 and 28 of about 50 mm are connected, respectively, and parallel bending lines 25' and 2
This is the point where the second flaps 27' and 28' are connected via the flaps 6' (FIG. 12).

The first flaps 27, 28 are bent outward at right angles (horizontally). Second flap 27', 28'
are below the first flaps 27 and 28, respectively.
After being folded inward by 180 degrees, each flap is integrally joined to the first flaps 27 and 28 by adhesion or welding, and an opening flange 8 of a double-pasted structure is formed horizontally outward.

This opening flange 8 serves to reinforce and stiffen the upper edge of the opening of the box, as a substitute for the reinforcing frame member 11 shown in FIG. 9, for example. Moreover, the sharp cuts of the corrugated cardboard sheet are hidden below the opening flange 8 and are not exposed.

As a means for determining the outward horizontal position and attitude of the opening flange 8, there are protrusions 2a' and outer flaps connected to both ends of the longitudinal side wall plate 2 via bending lines 15 and 16. A sector-shaped piece 30, 30' having a center angle of 90° is connected to the upper end of each of 2a via a bending line 29 (12th
figure). Each fan-shaped piece 30, 30' is bent outward at a right angle, brought into contact with the lower surface of the opening flange 8, and joined by means such as adhesive or welding (11th
figure).

As a means to make the above-mentioned joint more efficient and strong, a bending line 26' is provided at the upper edge of the side wall plate 3 on the shorter side.
At both ends of the second flap 28' connected via the
A sector-shaped projecting piece 31 with an apex angle of approximately 90° is formed (the 12th
(Fig. 11), the fan-shaped piece 30 is configured so that substantially the entire surface thereof can be firmly joined to the fan-shaped protrusion piece 31 (Fig. 11).

Similarly, the second flap 2 of the side wall plate 2 on the long side
Also on both ends of 7' are fan-shaped projecting pieces 32 with an apex angle of approximately 90°.
(FIG. 12) is provided so that substantially the entire surface of the fan-shaped piece 30' can be firmly joined.

Fifth Embodiment Most of the construction of the plastic cardboard box shown in FIG. 13 is the same as the fourth embodiment shown in FIG.

The feature of this embodiment is that a reinforcing material 34 having vertical reinforcing ribs 33 is attached to the outer surfaces of the side walls 2 and 3 to increase strength and rigidity.

This reinforcing material 34 is also a plastic corrugated sheet, and the vertical ribs 33 are formed by bending the same sheet. The reinforcing material 34 is integrally fixed to the outer surfaces of the side walls 2 and 3 by adhesive, welding, staples, or the like.

Sixth Embodiment The plastic cardboard box shown in FIG.
It is made by folding and assembling cut plastic corrugated sheets as shown in the developed view of FIG.

Most of its configuration is common to the fourth embodiment shown in FIGS. 11 and 12.

However, as a means for determining and maintaining the position and posture of the opening flange 8, the tips are attached to the protrusions 2a' at both ends of the longitudinal side wall 2 and the upper end of the outer flap 2a through bending lines 35, respectively. Elongated strip-shaped winding pieces 36, 36' are formed by cutting the material at an angle of 45 degrees, and a bending line 37 is formed in the 45 degree direction (FIG. 15). And these wrapping pieces 36,
36' is bent at the bending lines 35 and 37 and wrapped around the opening flange 8 (Fig. 14), and then
They are integrally joined by means such as gluing, welding, or staples.

Seventh Embodiment The plastic cardboard box shown in Fig. 16 is
This is an example of a different configuration of the reinforcing frame material 11 shown in FIGS. 9 and 10. Furthermore, a frame material 43 corresponding to the reinforcing frame material f shown as a conventional example in FIG. 19, and a corner joint 40 corresponding to the corner member g
It is said to consist of

In particular, the corner member 40 is provided with a vertical slip stopper 42 in which the bottom flange 4 of the box is inscribed on the outer edge of the horizontal portion 41 that extends horizontally outward, resulting in a highly stable structure when the cardboard boxes are stacked. It is said that

Note that it is also possible to implement a structure in which the reinforcing frame material 11 shown in FIGS. 9 and 10 is provided with a similar anti-slip mechanism.

Effects of the present invention As detailed above in conjunction with the examples, the plastic cardboard box according to the invention has the following features:
The four circumferences of the bottom of the box are reinforced with bottom flanges 4, and the four corners of the box are reinforced and stiffened with vertical reinforcing frames 5, so even if it is handled roughly or bumps into other objects, it will not be damaged. It hardly gets scratched, deformed, or damaged, has excellent durability, long service life, and is economical.

Moreover, even when many boxes are stacked in multiple tiers, the reinforcing frame 5 exhibits a load capacity sufficient to withstand such stacking, making it convenient to use, reducing the space occupied during transportation and inventory management, and increasing efficiency. can be increased.

Furthermore, since the bottom flange 4 acts like a large eaves that protrudes above the gaps between the stacked boxes, there is no risk of foreign matter such as dust entering the lower boxes, and the It is possible to prevent contamination and quality deterioration of the stored articles.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the assembled plastic cardboard box of the first embodiment, Fig. 2 is a front view of the box in its unfolded state, and Figs. 3 and 4 are - and - of Fig. 1. 5 is a sectional view taken in the direction of arrows; FIG. 5 is a perspective view showing the plastic cardboard box of the second embodiment;
Figure 7 is a cross-sectional view of Figure 5, Figure 8 is a perspective view of a three-sided corner member that reinforces the lower parts of the four corners of the box, and Figure 9 is a perspective view of the third embodiment. , FIG. 10 is a sectional view taken along the - arrow in FIG. 9, FIG. 11 is a perspective view showing the plastic cardboard box of the fourth embodiment, FIG. 12 is a developed view of the box, and FIG.
The figure is a perspective view of a plastic cardboard box according to the fifth embodiment, FIG. 14 is a perspective view of a plastic cardboard box according to the sixth embodiment, FIG. 15 is a developed view of the same box, and FIG. Cross-sectional views showing the main parts of the plastic cardboard box of the example, FIGS. 17 to 1
FIG. 9 is a perspective view showing a conventional example.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a plastic cardboard box assembled by folding plastic cardboard sheets, the four circumferences of the bottom plate 1 are folded inward by a certain distance, and then the side walls 2 and 3 are made to stand upright; The folded portions are formed on the bottom flange 4 that protrudes parallel to the bottom plate 1, and at the four corners of the box there are middle flaps 3 formed on the edges of one of the adjacent side wall plates 2 and 3.
A. A plastic corrugated cardboard box characterized in that a reinforcing frame 5 is vertically formed by wrapping and overlapping the outer flaps 2a formed on the edge of the other wall plate. (2) At the bottom positions of the four corners of the cardboard box described in Claim 1 of the Utility Model Registration Claim, three-sided corner members 7 that hold the bottom flanges 4, 4 on the two sides and the reinforcing frame 5, respectively, are attached. A plastic cardboard box featuring: (3) A plastic cardboard box characterized in that a tubular or rod-shaped reinforcing frame member 11 is attached to the opening edge of the side wall of the cardboard box as described in claim 1 or 2 of the utility model registration claim. (4) At the opening edge of the side wall of the cardboard box described in paragraph 1 or 2 of the claims for utility model registration, a cardboard sheet is folded outward by a certain dimension substantially horizontally, and then the other end is bent inward. A plastic cardboard box characterized by being folded back to form an opening flange 8. (5) In order to form the opening flange 8 of the side wall of the cardboard box described in claim 4 of the utility model registration claim, the inwardly folded cardboard sheet is further folded along the outer surface of the side wall 2 or 3. to reach the lower bottom flange 4 and the side wall 2,
A plastic cardboard box characterized by being integrally joined with 3. (6) Formed from a plastic corrugated sheet with reinforcing ribs 33 on the outer surface of the side wall 2 or 3 of the corrugated box described in paragraph 1 or 2 or 3 or 4 of the claims for utility model registration. A plastic cardboard box characterized in that a reinforcing material 34 is integrally attached.