JP2021193043A - Assembled carton - Google Patents

Abstract

To provide a carton strong enough to prevent load collapsing, easily assembled, and assembled from one low-cost rectangular parallelepiped plank sheet.SOLUTION: Front and rear side plates and left and right side plates are formed around a bottom plate located on the center of one rectangular parallelepiped plank sheet, corner connection plates are formed at four corners of the bottom plate, and notches widened in V shapes are formed outside the tips of a crease line extending toward the center of the corner connection plates at the angle of 45 degrees.SELECTED DRAWING: Figure 2

Description

The present invention relates to a prefabricated cardboard box suitable for transporting fruits and vegetables such as strawberries, and relates to a cardboard box assembled from a single die-cut plank.

In many cases, harvested fruits and vegetables are shipped after being sorted at the fruit sorting plant, but strawberries are especially fragile, so special consideration should be given to the transportation method. It takes.

Therefore, the selected fruits and vegetables are packed in a transparent plastic container, further stored in a cardboard box that can accommodate about four packs, and then shipped by truck or the like with the cardboard boxes loaded in multiple stages.

Conventionally, many corrugated cardboard boxes used for shipping such fruits and vegetables are assembled from a flat plank made of a single piece of corrugated cardboard in consideration of the manufacturing cost and the convenience of transporting the corrugated cardboard box itself. There is.

The basic structure of such a plank is a square bottom plate, a pair of front and rear side plates connected to the four sides of the bottom plate, a pair of left and right side plates, and the outer sides of the four corners of the bottom plate. In many cases, it is die-cut into a shape provided with four corner connecting plates that are formed in and connected to adjacent side plates, and cuts and creases are provided at appropriate points.

Further, in assembling the front and rear side plates and the left and right side plates along the fold rules, the corner connecting plates are folded inward at an angle of 45 degrees to assemble in a box shape.

By the way, such cardboard boxes are often assembled at the above-mentioned fruit sorting plant, and since a large amount of fruits and vegetables are sorted at one time at the fruit sorting plant, it is necessary to assemble a large number of cardboard boxes in advance.

However, a cardboard box that can be assembled from a single plank as described above requires a certain amount of skill to assemble, and in the current situation where it is difficult to secure skilled workers due to a serious labor shortage. It is desirable that even workers who are unfamiliar with the work can easily assemble it.

As a corrugated cardboard box for transporting fruits and vegetables assembled from such a single plank, for example, Patent Document 1 describes a cardboard box in which folded walls 41 and 42 formed at four corners are preliminarily attached with a folded rule m7. Has been done.

Further, for example, Patent Document 2 describes a corner connecting plate 13 having a valley fold line 14 and a notch 15, similar to Patent Document 1.

Japanese Unexamined Patent Publication No. 6-56145 Japanese Unexamined Patent Publication No. 2016-130135

By the way, since the plank as described above uses corrugated cardboard, there are many cases where the plank has a grain that is easily bent in either the vertical direction or the horizontal direction. Therefore, when assembling the cardboard box, the connecting portion between the bottom plate and the side plate may be folded along the fold rule provided in the direction along the grain or in the direction perpendicular to the grain, and the size of the side plate is also hand. Since it is a large part that can be easily grasped by, it is easy to control the force, and the fold rule of the part can be folded relatively easily.

However, the folding of the four square-shaped corner connecting plates formed on the outer sides of the four corners of the bottom plate needs to be folded at an angle of 45 degrees with respect to the grain. Furthermore, since this part is small enough to be grasped by hand, it is difficult to control the force, and even if there is a crease in the diagonal direction in advance, it is difficult for a skilled worker to fold it quickly and accurately.

Regarding this point, although the ones described in Patent Documents 1 and 2 are provided with a valley fold line at an angle of 45 degrees in advance on the corner connecting plate, it seems that it is difficult to fold them quickly and accurately for the above reason. ..

Therefore, the present invention pays attention to the difficulty of folding the corner connecting plates at the four corners as described above with respect to the corrugated cardboard box assembled from one plank as described above, and even a worker who is unfamiliar with the work is concerned. By adopting a structure that makes it easy to assemble parts, the challenge is to provide a prefabricated cardboard box suitable for transporting fruits and vegetables, which is suitable for transporting fruits and vegetables, while realizing a significant reduction in labor and time required for assembly. It is supposed to be.

In the corrugated cardboard box of the present invention, as a first problem-solving means for achieving the above object, a square bottom plate and a pair of front and rear front and rear which are connected to the four sides of the bottom plate via a first folding rule. A side plate, a pair of left and right side plates, and four corner connecting plates formed on the outer sides of the corners of the bottom plate and connecting adjacent side plates via a second fold rule. A cardboard box assembled from a number of planks, the four corner connecting plates have a third fold rule extending from the corners of the bottom plate at an angle of 45 degrees toward the center of the corner connecting plate. It is an assembly-type corrugated cardboard box characterized in that it is formed and a V-shaped notch is formed outward from the tip of the third fold rule.

The second problem-solving means is that the V-shaped notch has a sandwiching angle in the range of 45 degrees to 90 degrees and is formed by two sides that are line targets with respect to the third fold rule. It is configured as follows.

Further, in the third problem-solving means, the notch extending in a V shape has a sandwiching angle of about 45 degrees, and one side thereof is formed on an extension line of the third fold rule, and the third fold is formed. It is configured to connect to the tip of the ruled line.

Further, the fourth problem-solving means is that the notch extending in the V shape has a sandwiching angle of about 45 degrees, and one side thereof is separated outward by about 5 mm from the extension line of the third fold rule. It is formed on parallel lines, and the base end of the one side is bent at an angle of about 45 degrees to connect with the tip of the third fold rule.

According to the first problem-solving means of the present invention, since a V-shaped notch is formed outside the tip of the third fold ruled line in the corner connecting plate at the four corners, the V-shaped notch is formed. Since you can put your finger in the notch of the mold and press the third fold rule with your entire finger to fold it, it is easy to make a fold trigger and you can fold it accurately along the third fold rule. Further, since the third fold rule is formed only from the corner portion to the center portion of the corner connecting plate, the length of the fold rule is short, and the fold rule can be easily folded with a small force.

In addition, according to the second problem-solving means, the sandwiching angle of the V-shaped notch is set to a large angle in the range of 45 degrees to 90 degrees, so that there is sufficient space for a finger to be inserted into the notch. Since it can be secured and the finger can be inserted close to the tip of the third fold rule, the third fold rule can be accurately pressed by the entire finger. Furthermore, since the V-shape is formed by two sides that are line-symmetrical with respect to the third fold rule, it is easy to create a more accurate fold trigger, and even force is applied to the left and right along the third fold rule. Because it can be folded, it can be folded quickly and accurately.

Further, according to the third problem-solving means, one side of the notch extending in a V shape is formed on the extension line of the third fold rule and is connected to the tip of the third fold rule. The notch does not have a V-shape that is line-symmetrical with respect to the third fold rule, but since the sandwich angle is approximately 45 degrees, it is possible to secure the space required to insert a finger into the notch. , You can fold the third fold rule quickly and accurately by pressing it with your entire finger.

Further, according to the fourth problem-solving means, since one side of the notch extending in a V shape is formed on a parallel line separated outward by about 5 mm from the third fold ruled line, the notch is formed. It does not form a V-shape that is a line target in the third fold rule, but as with the third problem-solving means, its sandwich angle is approximately 45 degrees, so it is possible to insert a finger into the notch. The required space can be secured, and the third fold rule can be pressed with the entire finger to fold it quickly and accurately.

Further, in the fourth problem-solving means, since the base end of one side of the notch extending in the V shape is bent at an angle of approximately 45 degrees and connected to the tip of the third folding rule, the third folding is performed. Since the notch near the tip of the ruled line forms a narrowing angle of approximately 90 degrees, which is a line target with respect to the third folded ruled line, it is easy to create an accurate trigger when folding the corner connecting plate, and it is along the valley fold line. Can be folded accurately.

As described above, when the prefabricated cardboard box of the present invention is used, a structure that allows easy assembly even by an unfamiliar worker is adopted, so that the labor and time required for assembly are greatly reduced. be able to. In addition, since such an easy-to-assemble cardboard box can be manufactured from a single plank, the manufacturing cost is low.

Planned development view of the plank sheet according to the embodiment of the present invention Same as above Phase diagram during assembly of cardboard box A state diagram showing the folded state of the corner of the cardboard box as above. Same as above Cardboard box assembly completion drawing A phase diagram of a strawberry pack housed in the same cardboard box Enlarged view of the corner connecting plate of the cardboard box as above Enlarged view of the corner connecting plate according to the inventions of claims 2 to 4. Enlarged view of the corner connecting plate according to the invention of claim 4.

Hereinafter, embodiments of the present invention will be described. First, FIG. 1 is a plan view of a flat plate-shaped plank 1 made of a piece of corrugated cardboard used in the prefabricated corrugated cardboard box of the present invention. Reference numeral 1 has a symmetrical shape in both the vertical direction and the horizontal direction, and at the same time as the die cutting, a notch or the like is provided at a predetermined position in addition to the fold rule indicated by the dotted line. Further, as described above, the plank 1 has a paper grain that is easily bent in either the vertical direction or the horizontal direction.

A square bottom plate 2 corresponding to the bottom after assembly is formed in the central portion of the plank 1, and four strawberry packs 12 are arranged as shown in FIG. 5, especially when trying to accommodate the strawberry pack. You can set it to the size.

Further, on the four peripheral sides of the rectangular bottom plate 2, a pair of front and rear side plates 3 having a rectangular shape and a pair of left and right side plates 4 are connected via a first fold ruled line 8, and the front and rear side plates 3 and the left and right side plates are connected to each other. Since No. 4 becomes a member constituting the side wall of the assembled corrugated cardboard box by bending upward along the first folding rule 8, it is necessary to form all the widths equal to each other.

Further, four corner connecting plates 5 are provided outside the corners 7 at the four corners of the bottom plate 2, and each corner connecting plate 5 is adjacent to the front and rear side plates 3 and the left and right side plates 4. The side plates are connected so as to be connected to each other via the second fold ruled line 9. Further, in particular, a horizontally long rectangular notch hole 19 is formed on the second folding rule 9 connecting the corner connecting plate 5 and the left and right side plates 4, making it easy to bend the portion.

Then, as shown in FIG. 6, each of the corner connecting plates 5 has a third fold that extends toward the center of the corner connecting plate 5 at an angle of 45 degrees starting from the corner 7 of the bottom plate 2. A ruled line 10 is formed, and a notch 14 extending in a V shape having a sandwiching angle α is formed outside the tip 15 of the third folded ruled line 10.

This V-shaped notch 14 is formed by two sides that are line-symmetrical with respect to the third fold rule 10, and in FIG. 6, the sandwich angle α is 90 degrees, and in FIG. 7, A. In the above, the case where the sandwich angle α is set to 45 degrees is described. However, if the notch 14 is formed by two sides that are line-symmetrical with respect to the third fold rule 10 in this way, the third fold is made when the fold is started. Since even force can be applied to both the left and right sides of the ruled line 10, it becomes easy to create a trigger for accurate folding.

Regarding the sandwiching angle α of the notch 14, when the angle of the sandwiching angle α exceeds 90 degrees, the start position of bending tends to deviate from the tip 15 of the third folding rule 10 and the sandwiching angle α is smaller than 45 degrees. If it is too much, it will not be possible to secure enough space to insert the finger into the notch 14, and it will not be possible to insert the finger close to the tip 15 of the third fold ruled line 10. Therefore, when the notch 14 extending in a V shape is formed by two sides that are line-symmetrical with respect to the third fold rule 10, it is desirable that the sandwich angle α is within the range of 45 degrees to 90 degrees.

Further, the notch 14 extending in a V shape forms one side of the V shape on an extension line of the third fold rule 10 and is connected to the tip 15 of the third fold rule 10, as shown in FIG. 7B. You can also let it. In this case, the notch 14 does not have a V-shape that is line-symmetrical with respect to the third folding rule 10, so that it is a little difficult to make a trigger when folding the corner connecting plate 5, but the sandwiching angle α is omitted. If it is set to about 45 degrees, the space required for putting a finger in the notch 14 can be secured, and the finger can be put in the notch 14 and the third fold rule 10 can be pressed by the whole finger. become.

Further, the notch 14 extending in a V-shape is configured as shown in C of FIG. 7 by translating one side of the V-shape outward by about 5 mm from the one shown in B of FIG. You can also do it. In this case, one side of the V-shape is formed on a parallel line that is separated outward by about 5 mm from the extension line of the third fold rule 10, and is formed with the tip 15 of the third fold rule 10. In order to connect, the base end of the one side is bent at an angle of about 45 degrees so as to be connected to the tip 15 of the third fold ruled line 10, and the position of the base end in this case is the above. It will coincide with the tip 15.

Further, the notch 14 in this case does not have a V-shape that is line-symmetrical with respect to the third fold rule 10 as a whole, as in the case shown in B of FIG. 7, but the details thereof are enlarged in FIG. Then, if the V-shaped sandwiching angle α is set to about 45 degrees, a notch having a sandwiching angle of 90 degrees is formed in the vicinity of the tip 15 of the third fold ruled line 10. Since this partial notch is formed in line with respect to the third fold rule 10, it is uniform on both the left and right sides of the third fold rule 10 when the corner connecting plate 5 is started to be folded. Since force can be applied, it becomes easier to create a trigger for accurate folding, and since one side of the notch 14 is separated outward by about 5 mm from the extension line of the third folding rule 10, the notch is cut. When the finger is put into 14, the thickness of the finger does not get in the way, and the third fold rule 10 can be easily pressed by the whole finger.

On the other hand, when the box is assembled, the corner connecting plate 5 overlaps with the left and right side plates 4 to increase the rigidity of the corners of the box. Therefore, when the corner connecting plate 5 is folded, the larger the area, the more the box. The rigidity of the corners of the box can be increased.

In this regard, in the notches 14 of B and C of FIG. 7, a right-angled triangular portion without a notch is formed in the corner connecting plate 5, and the area is formed even when the corner connecting plate 5 is folded. The large right-angled triangular outer shape can be maintained, and the rigidity of the corners can be further increased.

Next, a pair of inner plates 6 connected to the outer side of the left and right side plates 4 via the fourth fold rule 11 will be described. The inner plates 6 are the plank sheets 1 as described in FIG. The length in the vertical direction is the same as that of the left and right side plates 4, and the width in the horizontal direction is set to be the same as that of the left and right side plates 4. Then, as shown in FIG. 2, after raising the left and right side plates 4 and the front and rear side plates 3, the inner plate 6 is folded inside the cardboard box along the fourth fold rule 11 to form the portion of the left and right side plates 4. It is a member that has a double wall structure on the side wall and has a function of increasing strength.

Further, as shown in FIGS. 3 and 4, the inner plate 6 has a structure in which the inner plate 6 is folded inward from above the left and right side plates 4 so as to sandwich the double-folded corner connecting plate 5. Therefore, since the corner connecting plate 5 can be firmly fixed, it is desirable to provide the inner plate 6 especially when the strength of the box is required.

At that time, it is desirable that the fourth fold rule 11 is a double fold rule so as to correspond to the thickness when the side plate is woven, but the second fold rule 9 is further extended to the inner plate 6 and is further extended. If a vertical notch 13 is formed between the corner connecting plate 5 and the inner plate 6, flap-shaped folding pieces 18 can be formed at both ends of each inner plate 6.

Since the flap-shaped folding piece 18 is separated from the corner connecting plate 5 by the vertical notch 13, the flap-shaped folding piece 18 is stretched from the state shown in FIG. 3A. 2 If the inner plate 6 is bent at a right angle along the horizontal folding rule 9 and the inner plate 6 is folded inside the box so as to overlap the left and right side plates 4, the state shown in FIG. 3B is obtained. Therefore, the flap-shaped folding piece 18 has a structure that overlaps with the front and rear side walls 3, and a double wall structure is formed in the vicinity of the corners of the front and rear side walls 3 of the box to increase the strength of the box.

Further, a small protrusion-shaped insertion piece 16 is formed at an appropriate position on the outer side of the inner plate 6, and an insertion hole 17 corresponding to the insertion piece 16 is formed on the first fold ruled line 8. By inserting the small protrusion 16 into the insertion port 17 and assembling it, the inner plate 6 is made difficult to come off.

Further, by providing a convex notch along the 4th fold rule 11 in the central portion of the 4th fold rule 11, when the 4th fold rule is folded, a multi-stage stacking is performed above the box. The insertion pieces 20 are made to protrude, and when the boxes are stacked in multiple stages, the insertion pieces 20 are fitted with the insertion holes 21 for multi-stage stacking formed on the lower surface of the box, and the upper and lower boxes are formed. It is hard to slip.

The inner plate 6 having the above structure may be connected not only to the left and right side plates 4 but also to the front and rear side plates 3, but the front and rear pair of front and rear side plates 3 or the left and right pair of left and right side plates 4 may be connected. It suffices to connect to at least one of them.

Finally, in order to deepen the understanding of how the cardboard box of the present invention can be assembled easily and accurately, a specific explanation of how to assemble the cardboard box of the present invention will be added.

As described above, the corrugated cardboard box of the present invention is assembled from a single plank 1 having a plurality of creases and cuts at the same time as die cutting as shown in FIG. 1. It is desirable to first bend the bottom plate 2 in the front-rear and left-right directions along the first folding rule 8 formed around the bottom plate 2 to give a folding habit, and at that time, the inner plate 6 is connected to the left and right side plates 4. In that case, it is advisable to add a fold habit to the fourth fold rule 11 as well.

By this first bending work, the pair of front and rear side plates 3 and the left and right side plates 4 can be easily raised upward, and the second folding rule 9 in contact with the periphery of the corner connecting plate 5 is also first folded. Since it is on the extension line of the ruled line 8, it is bent at the same time and has a crease.

Next, it is necessary to fold the corner connecting plate 5 along the third folding rule 10 starting from the corner portion 7 of the bottom plate 2. As described above, the folding of this portion is performed at an oblique direction of 45 degrees with respect to the grain of the corrugated cardboard, so that it is difficult to make a trigger for folding, and it is the most difficult part to fold accurately according to the fold rule.

However, in the plank 1 of the present invention, since the third fold rule 10 is formed only from the corner 7 of the corner connecting plate 5 to the tip 15 of the central portion, the length of the fold rule is short and it is easy to fold, and the third fold is also made. Since a notch 14 extending in a V shape is formed outside the tip 15 of the ruled line 10, it is easy to make an accurate trigger for folding.

Then, along the first fold rule 8 and the second fold rule 9 that already have creases, the front-rear side plates 3 and the left-right side plates 4 around the bottom plate 2 are simultaneously raised upward, and the V-shaped notch is cut out. If you put your finger in 14 and apply force to the front side while pressing the third fold rule 10 from the back side of the corner connecting plate 5 with the whole finger, first the corner connection is made from the tip 15 of the third fold rule 10. The plate 5 gradually begins to bend, and the bending of the tip 15 triggers the folding to be accurately guided from the tip 15 to the corner portion 7, and the plate 5 can be quickly folded along the third folding rule 10.

The corner connecting plate 5, which is accurately folded along the third fold rule 10 in this way, is doubly folded through the state of A in FIG. 3, and when the front and rear side plates 3 and the left and right side plates 4 are completely upright, It is overlapped in parallel with the left and right plate 4, and the state shown in FIG. 3B is obtained.

When the inner plate 6 is connected to the left and right side plates 4, as shown in FIGS. 2 and 3, the portion where the left and right side plates 4 to which the inner plates 6 are connected and the corner connecting plate 5 overlap is inside. If the insertion piece 16 formed at the tip of the inner side wall 6 is inserted into the insertion hole 17 formed in the bottom plate 2 and fixed while being folded so as to be wrapped by the plate 6, the assembled drawing of FIG. 4 is completed. It becomes a state. In this state, the corner connecting plate 5 is very firmly fixed, the thickness of the side wall portion is increased, the strength is strong enough to withstand multi-stage loading, and the upper and lower boxes are not easily displaced. Will be able to.

As described above, the prefabricated cardboard box of the present invention adopts a structure that is easy to assemble even for a worker who is unfamiliar with the work, and the labor and time required for assembling can be significantly reduced. It has excellent strength and can be manufactured at low cost. Therefore, it is not particularly limited to fruits and vegetables, and can be effectively used when a large amount of cardboard boxes such as electric appliances are used.

1 Plank, 2 Bottom plate, 3 Front and rear side parts, 4 Left right side plate, 5 Corner connecting plate, 6 Inner plate, 7 corners, 8 1st fold rule, 9 2nd fold rule, 10 3rd fold rule, 11 4th Folded rule, 12 strawberry pack, 13 vertical notch, 14 notch, 15 tip of 3rd fold rule, 16 insert piece, 17 insert hole, 18 flap-shaped fold piece, 19 notch hole, 20 for multi-stage stacking Insert piece, 21 Insert hole for multi-stage stacking

Claims (4)

A rectangular bottom plate, a pair of front and rear side plates connected to the four sides of the bottom plate via a first folding rule, and a pair of left and right side plates are formed on the outer sides of the corners of the four corners of the bottom plate. It is a corrugated cardboard box assembled from a single plank provided with four corner connecting plates for connecting adjacent side plates to each other via a second fold rule, and the four corner connecting plates have the above-mentioned. A third fold rule extending from the corner of the bottom plate toward the center of the corner connecting plate at an angle of 45 degrees is formed, and a V-shape extends outward from the tip of the third fold rule. A prefabricated cardboard box characterized by the formation of cutouts. The claim is characterized in that the notch extending in a V shape has a sandwiching angle in the range of 45 degrees to 90 degrees and is formed by two sides that are line-symmetrical with respect to the third fold rule. The assembly-type cardboard box according to 1. The notch extending in a V shape has a sandwiching angle of approximately 45 degrees, and one side thereof is formed on an extension of the third fold rule and is connected to the tip of the third fold rule. The assembled cardboard box according to claim 1. The notch extending in a V shape has a sandwiching angle of about 45 degrees, and one side thereof is formed on a parallel line separated outward by about 5 mm from the extension line of the third fold rule. The assembly-type cardboard box according to claim 1, wherein the base end of the side is bent at an angle of approximately 45 degrees and connected to the tip of the third fold ruled line.

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