JP2001158423A - Folding container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a folding container which can be reliably folded even if a height of left and right side plates on a long side is formed to be longer than a half length in a short side of a base plate. SOLUTION: A height of a left side plate 40 and a right side plate 50 is formed to be longer than a half of a length in a short side direction of the base plate 10. First and second left folds 11, 12 are terminated at a position lower by a predetermined size H1 than an upper side 40a of the left side plate 40. The folds 11, 12 are separated into a center piece 41 and both triangular pieces 42 by vertical cuts 11b, 12b extending from their terminal ends 11a, 12a to the upper side 40a of the left side plate 40. First and second right folds 13, 14 are terminated at a position lower by the predetermined size H1 than an upper side 50a of the right side plate 50. The folds 13, 14 are separated into a center piece 51 and both triangular pieces 52 by vertical cuts 13b, 14b extending from their terminal ends 13a, 14a to the upper side 50a of the right side plate 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a folding container integrally formed of a synthetic resin or the like.

[0002]

2. Description of the Related Art Conventionally, when canned beer or canned juice is transported, the canned beer or canned juice is stored in a simple cardboard case, stacked, loaded in a container, and transported to a destination. I have. In this case, the purpose of the cardboard case is to serve as a box for receiving a bottom portion for collecting about 20 canned beers and canned juices, or to cover the top portion of the canned beer and canned juices. Although it has a role as a lid, it mainly serves as an insole when stacking canned beer and canned juice. For this reason, since the can has the strength at the time of loading, the cardboard case may be thin, and its thickness is about 2 to 5 mm.

By the way, in a delivery car for replenishing canned beer and canned juice to vending machines installed in various places, an empty cardboard case after replenishing canned beer and canned juice to the vending machine is not suitable. It is currently dismantled and finally disposed of. However, recently, the recycling of containers such as PET bottles is becoming established, and there is a demand for the cardboard cases as described above to be reused along this flow.

[0004] In order to meet such a demand, a folding container made of synthetic resin having a structure that can be folded after use has been provided as an alternative to the cardboard case (see, for example, Japanese Utility Model Registration No. 2507084). . The folding container is composed of a frame, a bottom plate, and two upper and lower plate-like portions which are attached to the frame and the bottom plate so as to be rotatable, and are connected to bend inward at connection portions. And a tilt plate attached so as to be rotatable with respect to the frame. When folding, the side plates are folded inward while the side plates are flipped inward, so that the entire container is overlapped on the bottom plate and folded. In other words, in the folded state,
The folded left and right side plates are placed on the bottom plate, and the two flipped up and down plates are placed on the bottom plate so that the top ends thereof are overlapped. As a result, since the container can be folded after use, the structure is convenient for transportation after use.

[0005] However, in such a folding structure, the side plate and the tilting plate are folded many times on the bottom plate,
In particular, since only the front end portion of the tilt plate overlaps, it cannot be folded in a form in which the whole is in close contact with each other, and has a bulky folding structure as a whole.

[0006] When folding a container having an open top as described above, the most common folding method is a structure for folding a paper case such as a cake box. That is, as schematically shown in FIG.
04 and the four corners of the right side plate 105 are folded into a triangular shape, whereby the lower side plate 102, the upper side plate 103, and the left side plate 10 are folded.
4 and the right side plate 105 are folded so as to be superimposed on the upper surface of the bottom plate 101, respectively.

[0007]

In the case of such a structure, the height L11 of the left side plate 104 and the right side plate 105 is
If the length is longer than 1/2 of the length L12 of the short side direction of the bottom plate 101 (L11> L12),
As shown in FIG. 14, the upper side portion 104a of the left side plate 104
And the upper side portion 105a of the right side plate 105 overlaps on the bottom plate 101 (hatched in the figure). Such an overlap is not so problematic as long as the case is made of a thin paper, since it can be deformed, but in the case of a folding container integrally formed of synthetic resin, even if it is formed thin. However, since the resin itself has a certain degree of rigidity and a certain thickness, there is a problem that the overlapping portion is in a floating state and cannot be completely folded. That is, when a folding container made of a synthetic resin is manufactured, the height L11 of the left side plate 104 and the right side plate 105 is longer than the length L12 of １ ／ of the length of the bottom plate 101 in the short side direction. It means that you are restricted. Therefore, avoiding this restriction, the height L11 of the left side plate 104 and the right side plate 105 is changed to the bottom plate 1
In order to make the length longer than the length L12 which is ２ of the length in the short side direction of 01, some contrivance is required.

The present invention has been made in order to solve such a problem. It is an object of the present invention to adjust the height of the left side plate and the right side plate, which are long sides, to the length in the short side direction of the bottom plate. 1 /
An object of the present invention is to provide a folding container that can be reliably folded even if it is formed longer than the length of the second container.

[0009]

In order to solve the above-mentioned problems, a folding container according to the present invention comprises a rectangular bottom plate, an upper plate and a lower plate which rise vertically from respective upper and lower sides which are short sides of the bottom plate. And a left side plate and a right side plate rising vertically from the left and right sides that are the long sides of the bottom plate,
The connection between the bottom plate and the upper plate is bent at the upper side, the connection between the bottom plate and the lower plate is bent at the lower side, the connection between the bottom plate and the left plate is bent at the left side, and the connection between the bottom plate and the right plate is bent at the right side. The left side plate is formed as a first left bent portion formed obliquely from both ends of the left side bent portion toward the center of the upper side of the left side plate when the connecting portion of the adjacent side plate is a bent portion between the side plates. The right side plate is divided into a center piece and a triangular piece on both sides by a portion and a second left bent portion, and the right side plate is formed in a first right oblique direction from both ends of the right side bent portion toward the center of the upper side of the right side plate. The central part and the two-sided triangular part are divided by the bending part and the second right bending part, and each bending part, which is a connecting part between each side plate and the bottom plate, is provided so that each side plate can be bent toward the inside of the container. Side plate The bent portion is provided so as to be bent in a direction in which the inner surfaces of the adjacent side plates are aligned with each other, and the first left bent portion and the second left bent portion of the left side plate are directions in which the outer surface of the adjacent central piece and the outer surface of the triangular piece are aligned. The first right bent portion and the second right bent portion of the right side plate are folding containers having a structure provided so as to be bent in a direction in which the outer surface of the adjacent central piece and the outer surface of the triangular piece are aligned. The height of the left side plate and the right side plate is formed to be longer than half the length of the bottom plate in the short side direction, and the first and second left bent portions are formed on the upper side of the left side plate. The end is located at a position lower than the predetermined dimension by a predetermined dimension, and is separated into a center piece and triangular pieces on both sides by a vertical cut line extending from the end to the upper side of the left side plate. Of it terminates at only the position of the lower predetermined dimension than the upper side portion, by a vertical score line which continues from the terminal end to the upper side of the right side plate, characterized in that it is divided into the central piece and on both sides triangular pieces.

[0010] In the above-mentioned structure, the folding container may be configured such that a line passing through the center of the bottom plate in the short side direction is a folding center line, and the predetermined size is such that the left side plate and the right side plate are overlapped on the upper surface of the bottom plate. When folded as described above, it is characterized in that it is formed to have a length equal to the distance between the upper side and the lower side via a line facing the folding center line.

In the above-described folding container, the thickness of the rectangular portion sandwiched by the vertical cut lines in each of the central pieces of the left side plate and the right side plate may be different from each other. It is characterized in that it is formed thinner.

[0012] In the above-mentioned folding container, the upper side of the rectangular portion sandwiched by the vertical cuts in each central piece of the left side plate and the right side plate is closer to the upper side. It is characterized in that it is formed so as to become gradually thinner.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state in which the folding container of the present embodiment is three-dimensionally expanded, FIG. 2 is a perspective view showing a state in which the container is being folded, and FIG. 3 is a perspective view showing the state in which the container is folded. .

The folding container according to the present invention has a rectangular bottom plate 1.
0, the upper plate 20, the lower plate 30, the left plate 40, and the right plate 50 which rise vertically from each of the upper, lower, left and right sides of the bottom plate 10.
Left side plate 4 which is a long plate side
0 and the height L1 of the right side plate 50 is formed so as to be longer than the length L2 of 1/2 of the short side direction length of the bottom plate 10 (L1> L2). I have.

In the folding container according to the present invention having such features, rib pieces 15 (15a to 15d) projecting upward are formed around the bottom plate 10, and the container is formed around the upper plate 20. The rib pieces 25 (25a to 25d) protruding toward the inside of the container are formed, and the rib pieces 35 (3
5a to 35d) are formed.

Here, the connecting portion between the rib piece 15c of the bottom plate 10 and the lower end surface 45d of the left side plate 40 is formed by bending the left side bent portion 8
0, rib piece 15d of bottom plate 10 and lower end surface 55 of right side plate 50
Assuming that the connection portion with the right side bent portion 90 is a right side bent portion 90, the left side bent portion 80 and the right side bent portion 90 face the left side plate 40 and the right side plate 50 toward the inside of the container (that is, the upper surface of the bottom plate 10) (FIG. 1). It is bendable (in the direction of arrow s).

The left side plate 40 has a left side bent portion 80.
From both ends 80a, 80b of the left side plate 40 to the upper side 40a
Are divided into a central piece (also referred to as a central triangular piece) 41 and triangular pieces 42, 42 by a first left bent part 11 and a second left bent part 12 formed in a 45 ° direction toward the center part of the. . Further, the first left bent portion 11 and the second left bent portion 12 are formed on the upper side portion 40a of the left side plate 40.
The end is located at a position lower by a predetermined dimension H1 (see FIG. 4), and the center triangular piece is formed by the cut lines 11b and 12b in which a cut is made vertically from the end portions 11a and 12a to the upper side portion 40a of the left side plate 40. 41 and two triangular pieces 42, 42 on both sides.

The right side plate 50 also has a right side bent portion 90.
From both ends 90a, 90b of the right side plate 50 to the upper side 50a
Are divided into a central piece (also referred to as a central triangular piece) 51 and triangular pieces 52, 52 by a first right bent part 13 and a second right bent part 14 formed in a 45 ° direction toward the center part of the. . Further, the first right bent portion 13 and the second right bent portion 14 are formed on the upper side portion 50a of the right side plate 50.
The end is located at a position lower by a predetermined dimension H1 (see FIG. 4), and the center triangular piece is formed by the cut lines 13b and 14b in which a cut is made vertically from the end portions 13a and 14a to the upper side portion 50a of the left side plate 50. 51 and two triangular pieces 52, 52 on both sides.

The first left bent portion 1 of the left side plate 40
The first and second left bent portions 12 are arranged so that the outer surface of the adjacent central triangular piece 41 and the outer surface of the triangular piece 42 are aligned with each other (see FIG. 1).
The right side plate 5
0 first right bent portion 13 and second right bent portion 14
Is formed to be bendable in a direction in which the outer surface of the adjacent central triangular piece 51 and the outer surface of the triangular piece 52 match (the direction of arrow u in FIG. 1).

In such a bent shape of the left side plate 40 and the right side plate 50, as shown in FIG. 4, if a line passing through the center position in the short side direction of the bottom plate 10 is a folding center line Q, the left side plate 40 and the right side The predetermined dimension H1 of the cut lines 11b to 14b formed in each of the plates 50 is such that when the left side plate 40 and the right side plate 50 are folded so as to overlap the upper surface of the bottom plate 10 (see FIG. 4C), the folding center line Q
Through the upper sides 40a, 50a and the lower sides 40b, 50
It is formed to have a length equal to the distance to the b side. That is, as described above, the height L1 of the left side plate 40 and the right side plate 50 (here, the height on the inner surface side of the container as shown in FIG. 3A) is the length of the bottom plate 10 in the short side direction. (here,
As shown in FIG. 3A, the length of the inner surface of the container is 1/1/3.
The length L2 is set to be longer than the length L2, and twice the difference (L1-L2) of the lengths is set to be substantially equal to the predetermined dimension H1. That is, the left side plate 4
The central triangular pieces 41, 51 of the 0 and right side plates 50, respectively.
, Vertical cut lines 11b, 12b and 13
b, 14b, rectangular portions 41a, 51 sandwiched between
a is an overlapping portion when folded.
Therefore, in the present embodiment, the thickness of the overlapping portions (hereinafter, referred to as overlapping portions) 41a and 51a is formed to be thinner than the other portions of the central triangular pieces 41 and 51, and is formed to about half the thickness. Is preferred.

In this case, in the present embodiment, the inner surfaces of the central triangular pieces 41 and 51 are recessed so that the overlapping portion 41 is formed.
The thickness of a and 51a is about half that of the other parts,
Conversely, the outer surfaces of the central triangular pieces 41, 51 may be concave so that the thickness of the overlapped portions 41a, 51a is about half that of the other portions. Further, one central triangular piece (for example, 41) may be recessed on the inner surface side to form an overlapped portion 41a, and the other central triangular piece (for example, 51) may be recessed on the outer surface side to form an overlapped portion 51a. . When formed in this way, the overlap between the overlapped portions 41a and 51a when folded is better.

The overlapping portions 41a and 51a are formed such that their tips are tapered (that is, gradually thinner toward the upper side). When the container is formed in such a tapered shape, when the container is folded, as shown in FIG. 4B, the leading ends of the overlapping portions 41a and 51a do not come into contact with each other and easily pass each other, so that the folding operation is smooth. Become.

The first left bent portion 1 of the left side plate 40
The synthetic resin clip pieces 61 are integrally formed so as to straddle each of the first and second left bent parts 12 and the first right bent part 13 and the second right bent part 14 of the right side plate 50. I have. However, the portions where the clip pieces 61 of the left side plate 40 and the right side plate 50 are formed are openings. FIG. 5 is a sectional view showing a state in which the clip piece 61 is cut in the longitudinal direction. Since the shape and structure of all the clip pieces 61 are exactly the same as those shown in FIG. 5, here, the clip pieces 61 shown in FIG. 5 will be described.

The clip piece 61 is formed so as to protrude slightly from the inner surface of the right side plate 50, and is connected to the center piece 51 of the right side plate 50 and has a flat plate-like support piece 6 having a certain thickness.
1a and a thin plate-like rotating piece 61b extending from the tip of the supporting piece 61a and connected to the adjacent triangular piece 52.

When the folding container of this embodiment is three-dimensionally unfolded, the clip piece 61 has the first right bent portion 13, which is the connecting portion between the adjacent central piece 51 and the triangular piece 52, positioned outside (in the drawing). In this case, when the folding container is folded, the adjacent central piece 51 and the triangular piece 52 are urged to be in close contact with each other. That is, when the folding container is folded, the turning piece 61b of the clip piece 61 is connected to the first right bent portion 13 which is a connecting portion between the center piece 51 and the triangular piece 52 in addition to the turning fulcrum P1 of the clip piece 61 itself. Is rotated as a second rotation fulcrum P2. That is, a rotation trajectory R1 about the rotation fulcrum P1 and a rotation trajectory R2 about the second rotation fulcrum P2
As a result, for example, when a state in which the triangular piece 52 is rotated by 90 ° with respect to the center piece 51 (indicated by a two-dot chain line in the drawing) is considered, as shown in FIG.
1c rotates along the rotation locus R2, largely deviates from the rotation locus R1 of the clip piece 61 itself, and the support piece 61a is pulled downward by the difference to be curved.

This means that if the center piece 51 is fixed, the clip piece 61 tries to return to the original state when the triangular piece 52 tries to rotate in the direction of the arrow u in the figure from the state shown in the figure. When it is further rotated by more than 90 °, the triangular piece 52 is moved downward by the restoring force of the support piece 61a which has been pulled downward in the figure and is curved.
1 will be brought into close contact. Thereby, the clip piece 61 acts so as to push out the first right bent portion 13 which is a connecting portion between the adjacent central piece 51 and the triangular piece 52 when the folding container is unfolded three-dimensionally, It functions to maintain the shape of the box, and when the folding container is folded, the central piece 51 and the triangular piece 52
And acts to keep the folded plate from floating. The deformation of the support piece 61a is sufficiently ensured by the elastic force of the resin to be molded.

Adjacent ends of the side plates 20, 30, 40, 50 are connected to a hinge mechanism (21, 21) described later.
2, 43, etc.).
Adjacent ends of each side plate 20, 30, 40, 50
The hinge mechanism portion is formed so as to be able to bend in the direction in which the inner surfaces of the adjacent side plates are aligned (in the direction of arrow t in FIG. 1).

The lower edge of the upper plate 20 and the upper edge of the bottom plate 10, and the lower edge of the lower plate 30 and the lower edge of the bottom plate 10 are separated from each other. That is, the upper plate 20 and the lower plate 30 are connected only to the adjacent left and right plates 40 and 50 and are in a free state completely separated from the bottom plate 10. Therefore, in the present embodiment,
Even when the container is in the free state, the container is devised so that sufficient assembly strength can be obtained when the container is unfolded three-dimensionally, but the structure of the lower side of the upper plate 20 and the upper side of the bottom plate 10 and the lower plate 3
The structure of the lower side of 0 and the lower side of the bottom plate 10 will be described in detail later in the description of each part.

Next, the structure of each part of the above-structured folding container will be described in detail.

FIGS. 6 to 9 show the side plates 20, 30 and 4 respectively.
It is a detailed view of the hinge mechanism part which connects the adjacent ends of 0,50. Since all four hinge mechanisms have the same structure, only the hinge mechanism between the ends of the upper plate 20 and the left plate 40 will be described.

As shown in an enlarged and disassembled manner in FIG. 6, the upper plate 20 has upper support pins 21a for supporting the upper hinge pins 21a at upper and lower positions slightly inward of the rib pieces 25b formed on the side edges thereof. Piece 22a and lower hinge pin 21b
And a lower support piece 22b that supports the upper surface is disposed to face in the up-down direction. On the other hand, the side edge 4 of the triangular piece 42 of the left side plate 40
The rib pieces 45e and 45f formed in 2a are in a state where most of the ribs 45e and 45f are cut off except for the upper end and the lower end, and the hinge receiving portion 43 is formed in the cut out portion. I have. The hinge receiving portion 43 is formed by connecting the cylindrical body to its upper end surface 4.
3a and the lower end surface 43b are left in a state where they are split in half in the vertical direction (see also FIG. 9).
Pin insertion holes 44a and 44b are formed in the lower end surface 43b. In addition, the upper end surface 43a and the upper end side rib piece 4
A gap is formed between the lower end face 43e and the upper support piece 22a.
A gap is formed between the lower support piece 22b and the lower end rib piece 45f so that the lower support piece 22b formed on the upper plate 20 can be fitted.

FIG. 7 shows a state in which the hinge pins 21a, 21b formed on the upper plate 20 are inserted and locked in the respective pin insertion holes 44a, 44b of the hinge receiving portion 43 formed on the left plate 40. . In the state shown in FIG. 7, when the rib piece 25b formed on the upper plate 20 comes into contact with the side edge 42a of the triangular piece 42 of the left side plate 40, the hinge mechanism portion is turned outward (more than 90 °). It does not have a structure.

As shown in FIGS. 6 and 7, the rib 45f at the lower end of the triangular piece 42 of the left side plate 40 is cut off obliquely toward the lower corner 42b of the triangular piece 42. ing. By obliquely cutting in this way, it is possible to avoid contact with the rib pieces 25b of the adjacent upper plate 20 when the deployed container is folded. Further, the lower hinge mechanism portion, that is, the lower end surface 43b of the hinge receiving portion 43
Is formed slightly above the lower corner 42b of the triangular piece 42. As a result, a portion of the triangular piece 42 below the lower end surface 43b of the hinge receiving portion 43 and the upper plate 2
0 is lower than the lower supporting piece 22b.
It is a free end that is not directly affected by the engaging force between the hinge pin 21b and the hinge pin 21b. That is, some play can be provided. In addition to this, the pin insertion hole 44b is formed slightly larger, and the pin insertion hole 44b and the hinge pin 21 are formed.
If a slight play is also provided in the engagement structure with the b, the degree of freedom of the portion below the lower end surface 43b of the hinge receiving portion 43 and the portion below the lower support piece 22b of the upper plate 20 is further increased. Will increase. Then, by smoothly cutting off the rib piece 45f on the lower end side of the triangular piece 42 described above, a smooth folding at the hinge mechanism is realized.

FIG. 10 shows the shape of the bent portion 80 on the left side. This shape is the same for the right-side bent portion 90, and therefore, only the left-side bent portion 80 will be described here.

That is, the lower end surface 45d of the center triangular piece 41 of the left side plate 40 is disposed so as to contact the upper end surface of the rib piece 15c of the bottom plate 10. And the hanging piece 47 is further formed from the lower end face 45d of this central triangular piece 41,
A horizontally extending piece 48 is further formed from the leading edge of the hanging piece 47. The horizontally extending piece 48 is connected to the upper surface of the end of the bottom plate 10 by bonding or fusion. In such a structure, the left side bent portion 80
Is a connecting portion between the hanging piece 47 and the horizontal extending piece 48. The center triangular piece 41 is an upper surface of the bottom plate 10 as shown by a two-dot chain line in FIG. It is designed to bend to the side. When the central triangular piece 41 is set upright with respect to the bottom plate 10, the upper end face of the rib piece 15 c of the bottom plate 10 is connected to the lower end face 45 d
, And restricts further rotation of the central triangular piece 41 outward.

FIG. 11 shows the lower side of the upper plate 20 and the bottom plate 1.
0 shows a detailed structure of the upper side of (a), (a) shows a state in which the container is three-dimensionally expanded, (b) shows a state of being folded, and (c) shows a state of being completely folded. The same applies to the structure of the lower side of the lower plate 30 and the structure of the lower side of the bottom plate 10. Therefore, only the detailed structure of the lower side of the upper plate 20 and the upper side of the bottom plate 10 will be described here.

As described above, in the present embodiment, the lower side of the upper plate 20 and the lower side of the bottom plate 10 are not integrally connected and are completely separated.

That is, from the leading edge of the rib piece 25c formed on the lower side (lower edge) of the upper plate 20, a hanging piece 27 is formed which comes into contact with the outer surface of the rib piece 15a of the bottom plate 10. A horizontal extension piece 28 is formed from the edge to abut on the lower peripheral edge of the bottom plate 10. That is, in a state where the container is unfolded three-dimensionally, the L-shaped hanging piece 2 is formed.
7 and the horizontally extending piece 28 support the outer surface of the rib piece 15a formed on the bottom plate 10 and the peripheral edge of the lower surface of the bottom plate 10. When the vertical load applied to the bottom plate 10 is
Has a structure that supports this.

Further, a projection 29 having a semicircular cross section is formed upward at the distal end edge of the horizontal extension piece 28, and the projection 29 is formed on the lower surface of the bottom plate 10 opposed thereto. A groove-shaped fitting concave portion 19 for fitting is formed. That is, when the container is unfolded three-dimensionally and an object is placed, the fitting force between the protrusion 29 and the fitting recess 19 is opposed to the horizontal pressing force applied to the upper plate 20. I have. FIG. 12 is a perspective view showing the structure of the lower side of the upper plate 20 and the upper side of the bottom plate 10 in the middle of folding as viewed from the bottom side in a partial cross section.

Next, the procedure for folding the above-structured folding container from the three-dimensional state shown in FIG. 1 to the state shown in FIG. 3 will be described with reference to FIG.

The procedure of folding is very simple. The first left bent portion 11 and the second left bent portion 12 of the left side plate 40 and the first right bent portion 13 and the second right bent portion 14 of the right side plate 50 are combined. What is necessary is just to push in toward the inside of a container. Thereby, as shown in FIG. 2, the folding container is folded so that the upper plate 20, the lower plate 30, the central piece 41 of the left side plate 40, and the central triangular piece 51 of the right side plate 50 fold on the upper surface of the bottom plate 10. , Each of the triangular pieces 42, 42, 52, 52 of the left side plate 40 and the right side plate 50,
It falls down so that it may be inserted between the center triangular pieces 41 and 51 and the upper plate 20 and the left plate 30, respectively.

At this time, the side plates 20, 30, 40, 50
Is longer than half the length of the bottom plate 10 in the short side direction, and especially the left side plate 40 and the right side plate 50, which are the long side, as shown in FIG. 41,
The upper side portions 51a and 50a of the 51 are in contact with each other. However, since the upper sides 40a and 50a are tapered, they cross each other so as to pass each other, and are smoothly folded to the state shown in FIG. 4C. When folded in this way, the overlapping portions 41a, 51a of the central pieces 41, 51 overlap, but since the overlapping portions 41a, 51a are thinner than the other portions, they are bulky. It will be folded without.

At this time, a rib piece 15a as an upper side of the bottom plate 10 and a rib piece 25c as a lower side of the upper plate 20, a rib piece 15b as a lower side of the bottom plate 10, and a rib piece 35c as a lower side of the lower plate 30 are formed. Are separated, the rib pieces 25c of the upper plate 20 and the rib pieces 35c of the lower plate 30
Spreads slightly outward and pivots to lift,
The ribs 15a and 15b of the bottom plate 10 face each other (see FIGS. 11A, 11B and 11C). That is, the bottom plate 10 has a structure in which the bottom plate 10 does not receive any rotational load due to the upper plate 20 and the lower plate 30 when folded. Also,
At this time, the rib pieces 45f on the lower end side of each of the triangular pieces of the left side plate 40 and the right side plate 50 are cut off diagonally, and the lower side and the upper side of the lower end face 43b of the hinge receiving portion 43 of the triangular piece 42 are formed. Since the lower portion of the lower supporting piece 22b of the container 20 is a free end (see FIG. 6), when the unfolded container is folded, the rib piece of the adjacent upper plate 40 and the rib piece of the lower plate 50 are adjacent to each other. The structure is such that contact of the object can be avoided. With such various measures, the folding container of the present embodiment can be smoothly folded with a small force.

After folding, the left side plate 40 is placed on the bottom plate 10.
The central piece 41 of the right side plate 50 and the central piece 41 of
The upper plate 20 and the lower plate 30 are in close contact with each other via the triangular pieces 42, 42, 52, 52 to form a flat shape as a whole as shown in FIG. 3.

In each of the above embodiments, the clip 61 is formed integrally with the upper plate 2, the lower plate 3, the left plate 4 and the right plate 5, but only the clip 61 is separately formed. It can also be installed in a post-process. Further, the folding structure itself of the folding container is only an example, and is not limited to such a folding structure. For example, the structure of the connecting portion between the adjacent ends of the side plates 20, 30, 40, 50 does not need to be the structure of the hinge mechanism as shown in FIGS. in short,
The present invention is applicable as long as each side plate 20, 30, 40, 50 can be folded on the upper surface of the bottom plate 10 from the state shown in FIG. 1 to the state shown in FIG. It is.

As described above, according to the structure of the folding container of the present invention, the height L1 of each of the side plates 20, 30, 40, and 50 is set to be a half of the length of the bottom plate 10 in the short side direction. L
It can be formed so as to be longer than 2, and even if formed in this way, the structure can be sufficiently folded. However, assuming a foldable structure, the height L1 of each of the side plates 20, 30, 40, 50 is naturally limited. That is, each side plate 20, 30, 40, 5
0, the height L1 of the left side plate 40 and the right side plate 50 on the long plate side is the length of the bottom plate 10 in the short side direction (2 × L
2) It is a condition that the height L1 of the upper plate 20 and the lower plate 30 which are the short plate side is not more than half of the length of the bottom plate 10 in the long side direction.

[0048]

According to the folding container of the present invention, the height of the left side plate and the right side plate is formed to be longer than 1/2 of the length of the bottom plate in the short side direction, and the first and second left bendings are performed. The part ends at a position below the upper side of the left side plate by a predetermined dimension, and is separated into a center piece and both side triangular pieces by a vertical cut line extending from the end part to the upper side of the left side plate,
The first and second right bent portions terminate at a position below the upper side of the right side plate by a predetermined dimension, and are formed into a center piece and both side triangular pieces by a vertical cut line extending from the end portion to the upper side of the right side plate. It has a separate structure. In addition, the predetermined dimension is such that, when a line passing through the center position in the short side direction of the bottom plate is defined as a folding center line, when the left side plate and the right side plate are folded so as to overlap the upper surface of the bottom plate, a line facing the folding center line is defined. The length is formed to be the same distance between the upper side and the lower side through the intermediary side. Thereby, the height of each side plate,
Even when the bottom plate is formed to be longer than half the length in the short side direction, a folding container that can be easily folded in a flat state can be provided. That is, it is possible to provide a folding container having a large storage volume when three-dimensionally expanded, while having a foldable structure.

According to the folding container of the present invention, the thickness of the rectangular portion sandwiched between the vertical cut lines in each of the central pieces of the left side plate and the right side plate is formed thinner than the other portions. This portion does not become bulky when folded. Therefore, the entire container can be folded flat without being bulky.

Further, according to the folding container of the present invention, in the central pieces of the left side plate and the right side plate, the upper side portion of the rectangular overlapped portion sandwiched by the vertical cut lines gradually becomes thinner toward the upper side. It is formed so that it becomes. Thereby, the front ends of the overlapped portions do not come into contact with each other in the process of folding the container, and the containers easily cross each other, so that the container can be smoothly folded.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a folding container according to an embodiment of the present invention is three-dimensionally expanded.

FIG. 2 is a perspective view showing a state in which the folding container shown in FIG. 1 is being folded.

FIG. 3 is a perspective view showing a state where the folding container shown in FIG. 1 is folded.

FIGS. 4A to 4C are cross-sectional views showing movements of central pieces of a left side plate and a right side plate when the container is folded.

FIG. 5 is a cross-sectional view showing a state where a clip piece is cut in a longitudinal direction.

FIG. 6 is an exploded perspective view showing details of a hinge mechanism that connects adjacent ends of each side plate.

FIG. 7 is a perspective view showing details of a hinge mechanism that connects adjacent ends of each side plate.

8 is a sectional view of an upper end portion of the hinge receiving portion shown in FIG.

FIG. 9 is a sectional view of a central portion of the hinge receiving portion shown in FIG.

FIG. 10 is a cross-sectional view showing a shape of a bent portion on the left side.

11A and 11B show a detailed structure of a lower side of an upper plate and an upper side of a substrate, wherein FIG. 11A is a cross-sectional view showing a state in which the container is three-dimensionally expanded, and FIG. (C) is a sectional view showing a completely folded state.

FIG. 12 is a perspective view showing the structure of the lower side of the upper plate and the upper side of the substrate in the middle of folding, as viewed from the bottom side in a partial cross section.

FIG. 13 is a perspective view showing an example of a folding structure of a general folding container.

FIG. 14 is a plan view showing a state where the folding container shown in FIG. 13 is folded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Substrate 20 Upper plate 30 Lower plate 40 Left plate 41 Center piece 42 Triangle piece 50 Right plate 51 Center piece 52 Triangle piece 80 Left side bent part 90 Right side bent part 11 First left bent part 12 Second left bent part 13 First right Folded part 14 Second right bent part 11a, 12a, 13a, 14a End part 11b, 12b, 13b, 14b Cut line 41a, 51a Overlapping part 61 Clip piece Q Folding center line L1 Height of side plate L2 Short side direction of bottom plate Half length H1 Specified dimensions

Claims (4)

[Claims] 1. A bottom plate having a rectangular shape, an upper plate and a lower plate which rise vertically from upper and lower sides which are short sides of the bottom plate, and a vertical plate which rises vertically from left and right sides which are longer sides of the bottom plate. It is composed of a left side plate and a right side plate, a connecting portion between the bottom plate and the upper plate is an upper bent portion, a connecting portion between the bottom plate and the lower plate is a lower bent portion, a connecting portion between the bottom plate and the left plate is a left bent portion, When the connecting portion with the right side plate is a right-side bent portion, and the connecting portion of the adjacent side plate is a side-to-side plate bent portion, the left side plate is inclined from both ends of the left side bent portion toward the center of the upper side of the left side plate. A first left bent portion and a second left bent portion formed in the direction are divided into a center piece and triangular pieces on both sides, and the right side plate is arranged from both ends of the right side bent portion toward the center of the upper side of the right side plate. Formed diagonally Is divided into a central piece and a triangular piece on both sides by the first right bent part and the second right bent part. Each bent part, which is a connecting part between each side plate and the bottom plate, can bend each side plate toward the inside of the container. Are provided so as to be able to bend in a direction in which the inner surfaces of the adjacent side plates are aligned with each other. The first left bent portion and the second left bent portion of the left side plate are triangular with the outer surface of the adjacent central piece. The first right bent portion and the second right bent portion of the right side plate are provided so as to be bendable in a direction in which the outer surface of the adjacent central piece and the outer surface of the triangular piece are aligned. The height of the left side plate and the right side plate is formed to be longer than a half of the length of the short side direction of the bottom plate, and the first and second left bent portions are provided. Is The terminal ends at a position below the upper side of the left side plate by a predetermined dimension, and is separated into a central piece and triangular pieces on both sides by a vertical cut line extending from the terminal end to the upper side of the left side plate. The bent portion terminates at a position below the upper side of the right side plate by a predetermined dimension, and is separated into a center piece and triangular pieces on both sides by a vertical cut line extending from the end portion to the upper side of the right side plate. Characteristic folding container. 2. When a line passing through the center position of the bottom plate in the short side direction is a folding center line, the predetermined dimension is such that when the left plate and the right plate are folded so as to overlap the upper surface of the bottom plate, the folding center line 2. The folding container according to claim 1, wherein the container is formed to have a length equal to the distance between the upper side and the lower side through a line facing the folding container. 3. In each of the central pieces of the left side plate and the right side plate, a rectangular portion sandwiched by the vertical cut lines is formed to be thinner than other portions. The folding container according to claim 1 or 2, wherein: 4. In each of the central pieces of the left side plate and the right side plate, an upper side portion of a rectangular portion sandwiched by the vertical cuts is formed so as to become gradually thinner toward the upper side. Claim 1, characterized in that:
4. The folding container according to 2 or 3.