JP2002234526A - Folding type returnable box having hybrid structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding type returnable box having hybrid structure in which corner clips made of rigid material are removably fitted to four corners of a tray made of sheet material, thereby its durability is remarkably improved while restricting an increasing in cost to improve a convenience in use. SOLUTION: This box is comprised of a combination of a tray in which a sheet of material is folded up into a tray shape, and a connecting piece connecting between opposed ends of each of one set of side walls adjacent to each other is provided with overlapping slant folding lines extending from each of the corners at a tray bottom surface; and corner clips made of a rigid material used for reinforcing each of the corner locations of the tray while being fitted to the overlapped locations between one side portion with the overlapping slant folding line being applied as an interface and the adjoining side walls. The corner clip is provided with a substrate plate acting as a major body, holding pieces oppositely arranged at the substrate plate and fitted to the overlapped locations, a reinforcing piece extending at a right angle from the side end of the substrate plate and an anti-pulling protrusion arranged at the holding piece to prevent the corner clip from being dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid material such as a hard plastic, which is provided at the four corners of a tray which is folded up from a relatively inexpensive and cushioning sheet material such as a cardboard or paper-based or synthetic resin. The present invention relates to a folding box with a hybrid structure that has a remarkably improved mechanical strength by being detachably fitted with a formed corner reinforcing member and has improved usability.

[0002]

2. Description of the Related Art Various types of foldable returnable boxes that can be easily and quickly folded up into a tray from a single piece of cardboard have been considered.

[0003]

However, the returnable box made of corrugated cardboard, which is inexpensive and has a good buffering function, cannot withstand rough handling due to lack of essential mechanical strength, and has insufficient durability. was. In addition, there are many cases where it is difficult to smoothly perform folding and folding operations.

[0004] Therefore, an object of the present invention is to improve the mechanical strength of a hard plastic or the like at the four corners of a tray which is folded from a paper or synthetic resin-based sheet material such as corrugated cardboard and has relatively poor strength characteristics. Folding type with a hybrid structure that enhances durability while at the same time minimizing cost increases by assembling corner reinforcement members (corner clips) made of a suitable material. To provide a return box.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a foldable returnable box of a hybrid structure according to the present invention is provided.
A tray which is folded up in a tray shape from one sheet material, and has a connecting fold connecting between opposite side ends of a pair of side walls adjacent to each other, provided with a diagonal fold for polymerization extending from each corner of the bottom surface of the tray; In order to fix the overlapping state and to reinforce each corner point of the tray, sandwich the overlapping portion where one side portion of the connecting piece, which is bordered by the overlapping fold, is overlapped on the adjacent side wall. Characterized by a combination of a rigid material and a detachable corner clip.

[0006] The corner clip 300 has the following (a)-
It is characterized by comprising each component of (d). (B) Tray 2 which is the main body of the corner clip 300
A substrate 11 having a height equal to 00. (B) Reinforcing piece 1 extending in a fin shape perpendicular to the side end of substrate 11 to protect the outer surface of each corner of tray 200 and to increase the pressure resistance of tray 200.
2. (C) The substrate 11 is provided so as to face the substrate 11.
A clamping piece 13 for clamping the overlapping portion W in cooperation with (D) To prevent the corner clip 300 from dropping off the tray 200, a retaining projection 13 provided on the sandwiching piece 13
a. The lower end surface and the upper end surface of the corner clip 300 may be provided with engaging projections 11 and a and engaging recesses 14a that are fitted to each other to prevent displacement of the stacked returnable boxes. Also, if the length is an integer multiple of the width,
It is preferable to prepare a plurality of types of returnable boxes so that a plurality of returnable boxes can be stacked alternately in an orthogonal direction in a state where deviations are prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 6 shows a folding form of the folding returnable box (hereinafter simply referred to as returnable box) 500 of this embodiment.

The return box 500 has a tray 200 which can be folded up from a single cardboard (sheet material) 100 shown in FIGS. 1 and 2 into a box shape without a lid, and a form shown in FIG. As shown in FIG. 6, the tray 200 includes four corner clips 300 made of hard plastic, which are removably fitted to each corner of the tray 200.

The cardboard 100 of this embodiment has oil resistance
A modifier for improving water resistance and durability is impregnated or coated. The central area of the cardboard 100 is defined as the bottom surface 1 of the tray 200. The four sides of the bottom surface 1 have side walls 2A to 2D constituting the peripheral wall of the tray 200.
Are connected to each other via a fold line A. The upper edge of each of the pair of side walls 2A and 2C located opposite each other has an inner side wall 3
Are connected to each other via a double-row fold B.

Further, a pair of substantially L-shaped connecting pieces 4 are formed between both side ends of each pair of adjacent side walls 2A and 2B, 2B and 2C, 2C and 2D and 2D and 2A. It is straddled through. Each connecting piece 4 has two connecting pieces 4
A folding fold D for polymerization for folding is provided so as to extend from each corner of the bottom surface 1.

In the corner clip 300, as shown in FIG. 4, one side 4a of the connecting piece 4 bordering the overlapping fold D is overlapped with any one of the adjacent side walls 2A to 2D. In this state, it is detachably fitted so as to straddle the overlapping portion W.

Locking projections 3a project from the inner inner wall 3 near both side edges on the lower edge side thereof, and locking holes 5 for inserting the locking protrusions 3a are formed in the bottom surface 1. Are provided at each corresponding location. Further, a notch 6 for finger hooking is provided in a central portion on the lower edge side.

As will be described later, the corner clips 300 serve to reinforce the four corners of the folded tray 200, to facilitate and secure the folding / folding operation of the return box 500, and to further provide a stacked stack. It serves to prevent mutual displacement of the boxes 500 and the like.

FIG. 9 shows a form of the corner clip 300 of this embodiment. (A) is a front view, (b) is a perspective view of an inner surface, and (c) is a perspective view of the inner surface as viewed from a top surface side. The front view shape of the corner clip 300 is rectangular, and its height is slightly higher than the height of the tray 200.

As shown in FIG. 1A, the main body of the corner clip 300 is a rectangular substrate 11 on the front side thereof. On one side end of the substrate 11, a reinforcing piece 12 extending in a direction perpendicular to the substrate 11 like a fin is integrally provided. The substrate 11 is provided with a rectangular hollow window b to save material and the like.

On the inner surface of the reinforcing piece 12, a rectangular plate-like holding piece 1 for holding the overlapping portion W in cooperation with the substrate 11 is provided.
As shown in FIG. 3B, 3 is protruded from the substrate 11 so as to face the substrate 11 with an interval of two cardboards 100 raised. As a result, a gap a for sandwiching the overlapped portion W is formed between the substrate 11 and the sandwiching piece 13. Further, a retaining projection 13a for preventing the corner clip 300 from dropping is provided on the inner side surface of the tip of the sandwiching piece 13.

The corner clip 300 is attached to the tray 2
In order to correspond to two directions, left and right, the reinforcing piece 12 is attached to the right end of the substrate 11, or
Prepare and place the same number of two types, extending to either of the left and right ends.

Then, as shown in FIG. 4, the edge of the connecting piece 4 is pulled down with the corner clip 300 fitted on the overlapping portion W of the tray 200 as shown in FIG. As shown in FIG. 9B, a retaining projection 13 a for preventing the corner clip 300 from falling off is provided to project toward the substrate 11.

Furthermore, the lower end surface of the substrate 11 and the top surface piece 14
Are provided with an engaging projection 15a and an engaging recess 15b for preventing the stacked returnable boxes from being displaced from each other.

Next, a method of assembling the use of the returnable box 500 of this embodiment and its function will be described. One cardboard 1
In order to assemble the return box 500 from the first corner 00 and the four corner clips 300, first, as shown in FIG. 3, the side walls 2B and 2D connected to the left and right ends of the bottom surface 1 and the side walls 2B and 2D Are bent 180 degrees inward along the folds A and C, respectively, and are folded on the bottom surface 1 along the folds A and C.

In this state, a corner clip 300 is attached to each overlapping portion W where one side portion 4a of each connecting piece 4 bordering the overlapping fold D and the side walls 2A and 2C are folded.
4 is externally fitted in a straddle-like shape as shown in FIG. At this time, the direction in which the corner clip 300 is fitted is such that the L-shaped substrate 11 and the reinforcing piece 12 come into contact with the outer surface of the corner portion of the tray 200 as shown in FIG. I do.

After the four corner clips 300 have been fitted, the side walls 2A and 2C are erected along the fold line A, and the inner side walls 3 connected to the upper edges thereof are connected. , 3 are folded along the double-fold fold B inside the side walls 2A, 2C, respectively, as shown in FIG. Then, according to the manner in which the folding diagonal folds D provided on the connecting piece 4 and the folds C on both sides of the connecting piece 4 are formed, as shown in FIG. And the side walls 2B, 2D are also erected from themselves by this movement.

When the four peripheral side walls 2A to 2D have been raised, the locking projections 3a projecting from the lower edge of the inner side wall 3 are formed.
Is fitted into the locking hole 5 provided at the corresponding location on the bottom surface 1 by itself, and almost one-touch operation of the return of the return box 500 is completed, and this folded state is securely fixed.

With the return box 500 folded up, the tray 2
As shown in FIG. 6, the substrate 11 and the reinforcing piece 12 of the corner clip 300 which are continuous in the form of an angle material are brought into contact with the outer surfaces of the four corners of 00 as shown in FIG. The top surface pieces 14 are applied to the top surfaces at the four corners.

Therefore, when stacking returnable boxes 500,
A large load applied to each returnable box 500, an impact force applied to the four corners from the side of the box during handling of the returnable box 500, or a sharp corner of the box is applied when the box is inadvertently dropped. The hard plastic corner clip 300, which has much higher mechanical strength than corrugated cardboard, reliably receives a large impact force or the like. Thereby, the goods stored in the tray 200 are reliably protected from various impact forces received during the handling of the return box 500.

When folding the used returnable box 500, put a finger on the notch 6 for finger hooking,
Once the tray 200 is expanded outward, the side wall 2
If B and 2D are pushed inward and folded again on the side walls 2A and 2C, the returnable box 500 can be folded into the flat state shown in FIG. 8 by almost one-touch operation.

In order to fold up the returnable box from this folded state, as shown in FIG. 4, the inside walls 3, 3 which are folded inside the side walls 2A, 2C, respectively, are temporarily After expanding in the direction, the above-mentioned folding operation may be performed.

The material of the tray 200 is made of corrugated cardboard, which has relatively poor durability, whereas the corner clip 300 made of hard plastic is far more durable. Therefore, keep using the return box 500 and
If damaged, only the corner clip 300 is removed and reused as a material such as recycled cardboard. The removed corner clip 300 can be repeatedly used as a reinforcing member of the new tray 200.

The return box 500 of this embodiment has a length to width ratio of 2: 1. However, of course, the size ratio is not limited, and depending on the type of the packaged article, for example,
The length may be an integral multiple of the width, such as 2 to 2, 3 to 1, or the like.

When a plurality of types of returnable boxes having different sizes are stacked, for example, as shown in FIG. 10, a long and narrow returnable box is alternately perpendicular to each step. If you stack them in the correct direction, the stacking condition will be stable. Of course, all the sets of corner clips 300 facing each other in the vertical direction for each step are fitted with the respective engaging projections 15a and the engaging recesses 15b, so that there is a possibility that the stepped state may be collapsed. Is lost.

The weight of the upper returnable box 500 is
The corner clip 300 of the lower returnable box 500 receives it. This can prevent the weight of the upper returnable box 500 from being directly applied to the tray 200 of the lower returnable box.

Further, as shown in FIG. 10, even if a returnable box 600 having a length-to-width ratio of 2: 2 is stacked on a returnable box 500 that is stacked in two stages, the returnable box 500 is formed in two levels. The same effect can be obtained as when stacked.

In the above embodiment, corrugated cardboard is used as the sheet material. However, for example, cardboard or plastic sheet may be used. Also, corner clip 300
May be, for example, an aluminum cast product or a sheet metal processed product.

[0034]

As is apparent from the above description, the present invention has a configuration in which corner clips made of a rigid material are detachably fitted to four corners of a tray made of a sheet material such as cardboard. Has a practically excellent effect as listed below. (A) The durability can be significantly improved while minimizing the production cost of the returnable box. (B) Even if a relatively poorly-durable tray is damaged, a much more durable corner clip can be removed from the tray and reused. (C) Corner clips cover the outer surfaces of the four corners where impact force is likely to be applied during handling of the return box. (D) The corner clips at the four corners of the tray, which are likely to be impacted during handling of the return box, are protected very effectively by the corner clips. (E) When stacking returnable boxes, the load of the upper box is not transmitted directly to the lower tray, but is securely received only by the lower corner clips. (F) Therefore, there is almost no possibility that the tray is compressed and deformed by the load from above. (G) By providing the engaging projection and the engaging recess on the upper end surface and the lower end surface of the corner clip,
The lateral displacement between the return boxes can be reliably prevented. (H) When stacking a plurality of types of trays each having a length dimension that is an integral multiple of the width dimension, stacking can be performed extremely stably with the upper and lower trays being orthogonal to each other. (I) Also in this case, the engaging projections and the engaging recesses of the corner clips of the upper and lower returnable boxes can be reliably engaged. (J) The corner clips at the four corners of the tray are always
By leaving it attached, the return of the return box
Folding operation can be performed quickly and reliably. (K) Also, the corner clips protect the tray when stacking folded returnable boxes.

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is a plan view of a state where a tray is developed into one sheet material.

FIG. 2 is a perspective view of a sheet member according to the first embodiment;

FIG. 3 is a perspective view showing a state in which the tray is started to be folded from the sheet material.

FIG. 4 is a perspective view showing a state in which a corner clip is fitted to each of four corners of the tray during folding of the tray.

5 is a perspective view showing a state in which the returnable box is being further folded from the folding stage in FIG. 4;

FIG. 6 is a perspective view of the assembled returnable box;

FIG. 7 is a perspective view showing a state in which two returnable boxes are abutted side by side.

FIG. 8 is a perspective view showing a state where the returnable box is folded.

FIG. 9 is a perspective view of the corner clip as viewed from the front side, a perspective view as viewed from the inner side, and a perspective view as viewed from the top side of the corner clip.

FIG. 10 is a perspective view showing a state in which a plurality of types of returnable boxes having different vertical / horizontal dimensional ratios are stacked.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 cardboard (sheet material) 200 tray 300 corner clip 500,600 return box 1 bottom surface 2A to 2D side wall 3 inside wall 3a locking projection 4 connecting piece 4a one side portion 5 locking hole 6 finger notch 11 substrate 12 reinforcement Piece 13 clamping piece 14 top piece 15a engaging projection 15b engaging recess a clamping gap b hollow window A, C fold B double row fold D overlapping fold W overlap location

Claims (4)

[Claims] 1. A fold-over fold extending from each sheet material into a tray and extending from each corner of the bottom surface of the tray to a connecting piece connecting between opposing ends of a pair of adjacent side walls. A tray provided with: a portion where one side of the connecting piece, which is bordered by a fold for polymerization, is overlapped on an adjacent side wall so as to sandwich the overlapped portion, thereby fixing this overlapped state, and at each corner of the tray. A folding box with a hybrid structure characterized by a combination of a rigid material and a detachable corner clip for reinforcing a corner portion. 2. The corner clip 300 includes the following (A)
The foldable returnable box of the hybrid structure according to claim 1, comprising each of the components (1) to (4). (B) Tray 2 which is the main body of the corner clip 300
A substrate 11 having a height equal to 00. (B) Reinforcing piece 1 extending in a fin shape perpendicular to the side end of substrate 11 to protect the outer surface of each corner of tray 200 and to increase the pressure resistance of tray 200.
2. (C) The substrate 11 is provided so as to face the substrate 11.
A clamping piece 13 for clamping the overlapping portion W in cooperation with (D) To prevent the corner clip 300 from dropping off the tray 200, a retaining projection 13 provided on the sandwiching piece 13
a. 3. An engaging projection 15 and an engaging recess 15a which are fitted to each other to prevent displacement of the stacked returnable boxes are provided on the lower end face and the upper end face of the corner clip 300. The folding type return box of the hybrid structure according to claim 1. 4. By preparing a plurality of types of returnable boxes having a length dimension that is an integral multiple of the width dimension, a plurality of returnable boxes can be stacked alternately in an orthogonal direction in a slip-proof state. The folding returnable box of the hybrid structure according to any one of claims 1 to 3, wherein: