JPH09272531A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a sufficient strength of a packaging container that can be fabricated from a flat blank sheet and is made up of sheet-like members. SOLUTION: A packaging container includes an open-top container main body 1 that is formed by folding a blank sheet, and connectors 2 that connect adjacent sidewalls 12 and 13 of the container main body 1 together. The connectors 2 connect the ends of the sidewalls 12 and 13 together so as to prevent them from coming out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container, and more particularly to a packaging container which is a box made of a developable blank sheet.

[0002]

2. Description of the Related Art For a box-shaped packaging container made of a synthetic resin sheet and opening upwards, a method of combining the members produced by extrusion to form the packaging container is disclosed in Japanese Patent Laid-Open No. 5-5.
It is disclosed in Japanese Patent No. 503909. This is a method in which the packaging container is divided into a plurality of pieces, each division element is manufactured by extrusion molding, and each division element is assembled and integrated.

In this case, since the dividing elements are manufactured individually, even if the completed packaging container has a large size, it is only necessary to prepare the equipment corresponding to the individually dividing elements. There is an advantage that the equipment is not enlarged. However, in the case of a small item, since the dividing element has a packaging container main body composed of a bottom plate and four side walls of the packaging container that is divided into a plurality of pieces, the strength of the box-shaped container is the combination of the dividing elements. It was insufficient in the department.

[0004]

The invention of claim 1 is to assemble a flat blank sheet and to make the box-shaped packaging container made of sheet-shaped members have sufficient strength. It is an issue. The invention of claim 3, the invention of claim 5, the invention of claim 7, and the invention of claim 8 can simplify the work of assembling the corner portions of the blank sheets in a coupled state after solving the above-mentioned problems. The task is to do so.

[0005]

[Means for Solving the Problems] The technical means of the invention according to claim 1 taken in order to solve the above-mentioned problem is "a container body which is formed by bending a blank sheet into a box shape and opened upward.
(1) and a connecting tool (2) for connecting the ends of adjacent side walls (12) and (13) of the container body (1) to each other.
(2) is a structure in which the end portions of the side walls (12) and (13) are coupled to each other so as to prevent them from being pulled out ”.

According to this, the container main body (1) has
It is a box that consists of two side walls and opens upwards,
The container body (1) is manufactured by bending a blank sheet having the four side walls fixedly connected to the bottom.
Therefore, the bonding strength between these five members is sufficient.
The corner portion of the box made of the blank sheet is a connecting tool.
The edges of the adjacent side walls (12) and (13) are connected and fixed to each other by (2).

Therefore, the strength of the box-shaped packaging container is sufficient. The blank sheet includes "a blank sheet punched from a long sheet having a constant thickness into a developed shape mainly of the container" as defined in claim 2. The invention of claim 3 is the same as the invention of claim 2, wherein the side wall (1
2) The relationship between the structure of the connecting portion of (13) and the connecting tool (2) is limited. The limited configuration is that "the engaging protrusions are formed on the corner side end portions of the side walls (12) and (13). (14) is provided, and fitting grooves (21) and (21) that are fitted on both sides of the coupling tool (2) so as to wrap both of the engaging projections (14) are provided. (21) is a structure in which the side wall is opened downward and downward.

In this structure, the side walls (12) and (13) adjacent to each other have vertically extending engaging protrusions (14), and the engaging protrusions (14) are connected to the connecting member (2). It is housed in the fitting groove portions (21) and (21). Since the cross-sectional shape of the fitting groove portions (21) (21) is a shape that encloses the engagement convex portion (14), the fitting groove portion (21)
The side wall-side portion of the constituent wall of (21) and the fitting groove portion (21) are engaged with each other in the longitudinal direction of the side walls (12) and (13) in a retaining state.

Incidentally, the engaging convex portion (14) is a "folding portion formed by folding a certain range from the edge of the blank sheet as in claim 4". ], And in this case, the engagement between the engagement protrusion (14) and the fitting groove (21) is ensured, and the strength of the engagement portion is large. Further, since the blank sheet is engaged at the folded portion, when a repulsive force is applied between one of the side walls (12) and (13) and the coupling tool (2), the folded portion is elastically expanded. Although there is a tendency to try, the engagement between the connector (2) and the engagement protrusion (14) is further strengthened by this tendency.

According to the invention of claim 5, in the invention of claim 2, "a plurality of openings (15) and (15) are provided at the corner side edges of the side walls (12) and (13)," The connector (2) is provided with a hook-shaped projection (22) (2) (2) (2) (2)
2) is provided on the inner surface, and a pair of contact plates 23, 23 are flexibly connected. In this case, the hook-shaped projections (22) (22) inserted into the openings (15) (15) are in a retaining state between one of the side walls (12) (13) and the connecting tool (2). Engage. Moreover, since the hook-shaped protrusion (22) penetrates in a direction perpendicular to the direction of the repulsive force acting between the connector (2) and the side walls (12) and (13), the retaining force against the repulsive force is Is extremely large.

Further, since the pad plate (23) having the key-like projections (22) is flexibly connected, the key-like projections (22) can be easily inserted into the openings (15) and (15). The invention of claim 6 limits the manner of attaching the backing plate (23) of the invention of claim 5 and the like, "The connecting member (2) is provided with a column portion (25) at the center, The L-shaped reinforcing plate portion (24) circumscribing the corner portion of the container main body (1) is provided at both ends, and the contact plates (23) (23) are provided.
Is symmetrically and flexibly connected to the support column (25).

In this structure, the reinforcing plate portion (24) provided on the connecting member (2) determines the crossing angle of the joining portions of the adjacent side walls (12) and (13) by a predetermined angle by the reinforcing plate portion (24). Fixed to. In addition, it is easy to insert the hook-shaped projections (22) into the openings (15). According to the invention of claim 7, in the invention of claim 2, "the side wall (12) (1
3) An auxiliary piece (16) is continuously provided at one longitudinal end of one of them, and the auxiliary piece (16) is superposed on the other of the side walls (12) and (13),
A C-shaped or L-shaped holding piece (17) protruding laterally from the other of the side walls (12) and (13) or one of the auxiliary pieces (16) is made to project from an opening (18) provided in the other side. The connecting piece (2) is arranged along the position where the auxiliary piece (16) is overlapped with the other of the side walls (12) and (13), and the holding piece (2) protruding from the opening. 17) is provided with an insert piece (26) which is inserted from above. ”

In this structure, the auxiliary piece (16) and the opening (18) are engaged with each other in the direction along one wall surface of the side walls (12), (13). Then, since the engaging piece (26) inserted into the holding piece (17) engages in the direction perpendicular to the direction along the wall surface, the mutual coupling force between the adjacent side walls (12) (13). Is enough. According to the invention of claim 8, in the invention of claim 2, "the auxiliary piece (16) is connected to one end portion of the side wall (12) (13) in the longitudinal direction in a continuous manner. ) The side wall (12)
L-shaped engaging piece (3a) which is superposed on the other side of (13) and which projects inward at the other end of the side walls (12) and (13) and bends in a direction along the side wall from the protruding end. ) Is provided, and the auxiliary piece (16) is provided with a similar engagement piece (3b) that overlaps the engagement piece (3a) in a back direction, and the coupling tool (2) is opened downward. It has a vertically long hollow portion, and the side wall of the hollow portion is provided with a slit (S) for sandwiching the base end portions of the engaging pieces (3a) (3b) in the direction along the side wall and opening downward. It was the composition.

In this structure, the side walls (12) and (13) which are adjacent to each other can be obtained only by mounting the connecting tool (2) so that the bases of the engaging pieces (3a) (3b) are inserted into one slit (S). ) Is joined and connected. According to the invention of claim 9, in claim 7 or claim 8, "the auxiliary piece (16) is connected to one of the side walls (12) and (13) so as to be bendable," The side wall
(12) (13) During the work of joining the mutual with the connecting tool (2), the auxiliary piece (16) can be inserted into the engaged state while also being bent.

[0015]

According to the invention of claim 1, the strength of the mutual connection of the five members constituting the container main body (1) is sufficient, and the ends of the adjacent side walls (12) (13) which are the corners of the box body. Since the edges are connected and fixed to each other, it is an assembly type and has sufficient strength. According to the invention of claim 3, the connector (2) is provided with side walls (12) (13).
It is assembled into a box-shaped container simply by fitting it from above into the mutual joint of the end portions of the side walls (12) (13) and the connecting tool (2) with respect to the longitudinal direction of the side wall. The connector (2) does not come off easily.

According to the invention of claim 4, in the invention of claim 3, the strength of the engaging projection (14) and the engaging projection (14).
The engagement strength between the above and the constituent wall of the fitting groove (21) is further improved. According to the invention of claim 5, the connector (2) and the side wall (1
2) Since it penetrates in the direction perpendicular to the direction of the repulsive force acting between (13) and (13), the retaining force against the repulsive force becomes extremely large.

The inventions of claim 7 and claim 8 have the same effects as the inventions of claim 3 and claim 5 because the above-mentioned actions are exhibited. Particularly, in the invention of claim 7, the side wall
(12) There is an advantage that the member itself for mounting the connecting tool (2) of (13) engages in the relative movement preventing state in the direction along the one side wall. In the invention of claim 8, one slit is provided.
There is an advantage that the side walls (12) and (13) which are adjacent to each other are joined and joined only by attaching the connecting tool (2) so that the bases of the engaging pieces (3a) and (3b) are inserted into (S).

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 This embodiment has the configuration shown in FIGS.
As shown in Fig. 1, once the extruder (A) is used, a long strip of synthetic resin sheet (polypropylene resin, PET resin, ABS
Resin, polyethylene resin, etc. can be used. ) Is manufactured, and this raw material sheet (M) is placed on a take-up machine consisting of a pair of cylinders, and a protruding rib is provided at a portion corresponding to a blank sheet by a vacuum compressor (C) via a dancer roll (B).
Then, it is punched into a predetermined shape by a punching device (D) to obtain a blank sheet.

The packaging container produced by the above process is
As shown in FIG. 2, reinforcing ribs (R) (R) are formed on the bottom (11) of the container body (1) and the four side walls connected to the bottom (11). Further, handle holes (H) (H) are formed in the side wall (13) on one short side of the adjacent side walls (12) (13). In the vacuum compressor (C), the reinforcing ribs (R) (R) are formed at the positions set based on the above relationship. Therefore, as shown in FIG. 3, the raw material sheet (M) that has passed through the vacuum compressor (C) has a plurality of reinforcing ribs (R) (R) in the blank sheet-shaped area shown by the imaginary line. It is arranged so as to conform to the configuration of each surface.

The reinforcing rib (R) is a linear rib having an arcuate cross section. Raw material sheet that passed through this vacuum compressor (C)
In the punching device (D), (M) is blanked into a blank shape as shown in FIG. In this blank sheet, a boundary between a bottom wall equivalent part (110) which becomes the bottom part (11) and side wall equivalent parts (120) (130) corresponding to two sets of side walls (12) (13),
And a thin portion (L) corresponding to a fold line (indicated by a broken line) at the boundary between the side wall corresponding portions (120) and (130) and the ears (140) corresponding to the engaging protrusions (14). ) Has been formed.

The thin portion (L) is folded into a box body which is opened upward, and the portion corresponding to the ear portion (140) is folded inward. As shown in FIG. The engaging protrusions (14) are formed at the joint ends of the side walls (12) and (13). The joint (2) shown in the figure is attached to the joint between the adjacent side walls (12) and (13). This connecting tool (2) is a hollow column having a triangular cross section at a right angle, and is formed with a pair of fitting groove parts (21) (21) opening to both side edges and downward. The cross-sectional shape of the fitting groove portion (21) is substantially the same as the cross-sectional shape of the engaging convex portion (14) and the side walls (12) and (13) up to the vicinity thereof. Therefore, in the fitting groove (21), the opening width (2
10) matches the wall thickness of the side walls (12) (13), and the fitting groove (21)
The horizontal width of the wide part (211) on the inner side of the
It is set slightly larger than the thickness of 4).

The fitting groove portion (21) is open over the entire area below the closing plate portion (27) at the top of the connector (2). In the packaging container of this example, the fitting groove portions (21) and (21) are engaged with the engaging protrusions (14) and (14) at the corners adjacent to the connecting tool (2) from above. The projections (14) and (14) are externally fitted. Since the dimensions of the wide portion (211) and the opening width (210) are set in the above relationship, the side walls (12) and (13) are
Engages with the connector (2) in a retaining state. At this time,
The ears (140) forming the engaging protrusions (14) tend to rise up from the side walls (12) and (13) due to the elastic return force. Opening width
Since there is a stronger engagement with the boundary between the (210) and the wide portion (211), the engagement between the connector (2) and the side walls (12) and (13) is sufficient. The top surface of the connector (2) is
Since it is closed by 7), there is no inconvenience that the upper end surface of the coupling tool (2) formed in a hollow cylindrical shape is continuous, and it is safe because it has a uniform flat surface.

The ear portion which is the upper end of the engaging convex portion (14)
The outer edge of the (140) may have a shape matching the upper ends of the side walls (12) and (13) as shown in the figure, or may be cut obliquely as shown by a broken line. Further, as shown in FIG. 6, a protruding rib (141) may be provided inwardly near the upper end of the ear portion (140) of the engaging convex portion (14). In this case, the protruding rib (1
Since the frictional engagement force between the 41) and the wide portion (211) of the fitting groove portion (21) becomes large, the connector (2) is more difficult to come off from the side walls (12) and (13).

Further, in the above embodiment, the engaging protrusion (1
4) is formed by folding the ears (140), but as shown in FIG. 7, a plurality of protrusions (142) (at the ends of the side walls (12) (13) that do not extend the ears (140). 142) may be made continuous in the vertical direction, and this may be used as the engaging convex portion (14). In addition, in the case of the packaging containers of these examples, after the use, the connector (2) is attached to the side wall (1
2) It can be pulled out from the corner of (13) and the container body (1) can be returned to the expanded state for storage and is not bulky.

Although the connecting member (2) is an injection-molded product of synthetic resin having the closing plate portion (27), a biting hole (212) may be provided in a part of the closing plate portion (27). It is also possible to use an extrusion-molded product having a uniform cross section without the closing plate portion (27) and continuing to both upper and lower ends. In this case, the coupling tool (2) is obtained by simply cutting a long extrusion-molded product into a predetermined size.

In this example, the cross section of the connector (2) has a right-angled triangular shape, but a quadrangle, a fan shape or the like can be adopted if the two adjacent sides of the cross section of the connector (2) are orthogonal to each other. . Embodiment 2 Embodiment 2 shown in FIG. 8 is the side wall (12) (1) of the container main body (1).
Providing extension pieces (121) (131) at both ends in the longitudinal direction of (3), stacking the extension pieces (121) (131) with each other, and penetrating a pair of openings (15) (15) in the overlapping portion. Is forming. In particular,
In this example, each of the extension pieces (121) (131) is separated into upper and lower end pieces (a) and an intermediate piece (b), and the openings (15) (15) are formed in the intermediate piece (b). The intermediate piece (b) of the extension piece (121) is formed along the inner surface of the end of (13), and the intermediate piece (b) of the extension piece (131) is formed along the outer surface of the side wall (12). Both end pieces (a)
(a) is arranged in a manner opposite to that of the intermediate piece (b).

The connecting tool (2) has an L-shape having a size that covers the range of the extension pieces (121) (131) at the upper and lower ends of the central support (25).
The letter-shaped reinforcing plate portions (24) and (24) are projected, and the space between them is flexibly connected to the column portion (25) as the contact plates (23) and (23). The key-like projections (22) and (22) are projected to the inner surface side at positions corresponding to the openings (15) and (15) on the inner surface. The hook-shaped protrusion (22) has an inclined head portion (221) at the tip.
And the inclined heads (221) (221) are juxtaposed in such a manner that the inclined heads (221) (221) face each other.
(22) (22) serves as an engaging means with one opening (15). In this example, the pair of hook-shaped projections (22) (22) are arranged side by side in the horizontal direction, but they may be arranged side by side vertically.

In this structure, the extension pieces (121) and (131), which are continuously provided at the end portions of the side walls (12) and (13), are overlapped as shown in FIG. 25) along the outer surface of the overlapping portion, and the key-like protrusions (22) provided on the backing plate (23).
(22) is the overlapping portion of the side wall (12) and the extension piece (131) and
Opening (15) in the overlapping part of (13) and extension piece (121)
Insert it in (15) and connect them so that they cannot be pulled out. As a result, the corner portion of the container main body (1) is connected and at the same time the connecting device is connected.
It will be reinforced by (2).

The packaging container of this example also has a pair of key-like protrusions.
(22) The inclined heads (221) and (221) of (22) can be pulled out from the opening (15) while forcing them to approach each other. As a result, the connector (2) can be separated from the joints of the side walls (12) and (13) of the container body (1), the packaging container can be disassembled, and the container body (1) can be returned to a flat developed state. In this case, the hook-like protrusions (22) and (22) tend to shift from the overlapping portions of the extension pieces (121) and (131) of the side walls (12) and (13) to each other, whereas the hook-like protrusions (22 ) (22) is in a state of intersecting at right angles,
The connection strength of the side walls (12) and (13) is sufficient.

Embodiment 3 In Embodiment 3 shown in FIG. 9 and FIG. 10, an auxiliary piece (16) is connected to a side wall corresponding portion (130) of a blank sheet, and the auxiliary piece (1
6) is provided with a pair of openings (18) and (18), and a pair of holding pieces is provided at the other end of the side wall (12) overlapping with the side wall corresponding portion (130) at a position corresponding to the opening (18). (17) Formed from (17).

In the holding piece (17), a strip-shaped member having a constant width is C
As shown in FIG. 10, a flat through hole that vertically penetrates the side wall (12) in the state of being inserted in the opening (18) is formed in a protruding shape inward. Parts are formed. As shown in the figure, the connector (2) is constructed by bending a plate material in an L-shaped cross section, and has a concave through hole formed on one surface thereof, and a range surrounded by the through hole. Is a rectangular plate-shaped insert piece (26) (26). In this case, when the insertion pieces (26) (26) are inserted into the through-hole portions formed by the holding pieces (17) (17) protruding on the inner surface of the auxiliary piece (16), the container main body (1) The side walls (12) (13) of the connector (2)
It will be connected through.

Also in this example, the used packaging container can be disassembled by pulling out the connecting tool (2),
The container body (1) can be returned to the expanded state. The auxiliary piece (16) may be bendable with respect to the side wall (13). In this example, the plug (26) is attached to one side of the connector (2).
I only provided (26), but I provided this on both sides,
An auxiliary piece (16) is connected to the side wall (12), a holding piece (17) is formed on the auxiliary piece (16), and the holding piece (17) is provided on the side wall (13) side with an opening (18). ) (18) may be projected. In this case, the engagement point between the holding piece (17) and the insertion piece (26) is the side wall (1
2) It will be formed on both outer surface portions of the connecting tool (2) following the (13).

Fourth Embodiment In a fourth embodiment shown in FIG. 11, a cross section L is formed on the inner surface of the side wall (12).
The engaging piece (3) having an L-shaped cross section is formed at the end of the auxiliary piece (16) which is formed by projecting the engaging piece (3a) in the shape of a letter and which is connected to the end of the side wall (13).
b) is projected, and the base ends of the engaging pieces (3a) (3b) are the side walls.
(12) and the auxiliary piece (16) project from the inner surface at a right angle, and these engaging pieces (3a), (3b) are the engaging pieces (3a) (3a) (3a) The base ends of 3b) are arranged at positions where they face-to-face in the longitudinal direction of the side wall (12), and the tips of the engaging pieces (3a) (3b) are opposite to each other (longitudinal direction of the side wall (12)). (In the direction), the bent tongues that project in the direction are connected in series.

The connecting member (2) is a hollow cylinder having a cross section of a right angle and having a slit (S) formed in a part thereof, and the slit (S) is vertically formed on a side wall corresponding to one of the orthogonal sides of the cross section. It is formed so as to be open to the inside. Therefore, as shown in the same figure, the side walls (12) and (13) are combined and the engagement pieces (3a) and (3b) are overlapped with each other, and the base end portions of the engagement pieces (3a) and (3b) are When the connector (2) is pushed in with the slits (S) aligned with each other, the connector (2) causes the base end portions of the engagement pieces (3a) and (3b) to move to the side wall (1).
It is mounted and fixed to the corner portion of the container main body (1) in a manner of sandwiching it from both sides in the longitudinal direction of (2).

As a result, the packaging container is completed. Even in this case, since the connector (2) can be pulled out upward, the container main body (1) can be removed by removing the connector (2).
Can be returned to a flat blank sheet. The connector (2) can be manufactured by cutting a long material of uniform cross section manufactured by extrusion molding of synthetic resin according to the depth of the container main body (1), but by injection molding. May be.

Others In each of the above-described embodiments, each part is made of synthetic resin, but the connector (2) can be made of metal. Also rib
Since (R) is for reinforcement, it is not limited to the above-mentioned respective embodiments, and various shapes such as hemispherical shape, cross shape, and square shape can be adopted.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of a manufacturing process of a packaging container of the present invention.

FIG. 2 is an overall perspective view of the packaging container according to the first embodiment of the present invention.

FIG. 3 is a plan view of the raw material sheet (M) with the reinforcing ribs (R) formed thereon.

FIG. 4 is a plan view of a blank sheet.

FIG. 5 is an exploded view of a corner portion of the container main body (1) of the first embodiment.

FIG. 6 is an exploded view of a modified example of the first embodiment.

FIG. 7 is an exploded view of another modification of the first embodiment.

FIG. 8 is an exploded view of a corner portion of the container main body (1) of the second embodiment.

FIG. 9 is a plan view of a main part of a blank sheet according to a third embodiment.

FIG. 10 is an exploded view of a corner portion of the container main body (1) of the third embodiment.

FIG. 11 is an exploded view of a corner portion of the container main body (1) of the fourth embodiment.

[Explanation of symbols]

 (1) ・ ・ ・ ・ Main container (12) (13) ・ ・ Sidewall (2) ・ ・ ・ ・ Connector (14) ・ ・ ・ ・ Engaging protrusion (21) ・ ・ ・ ・ Mating groove (15) ) ・ ・ ・ ・ Aperture (22) ・ ・ ・ ・ Claw-shaped protrusion (23) ・ ・ ・ ・ Attachment plate (25) ・ ・ ・ ・ Post part (24) ・ ・ ・ ・ Reinforcement plate part (16) ・ ・ ・・ Auxiliary piece (17) ・ ・ ・ ・ Holding piece (18) ・ ・ ・ ・ Opening (26) ・ ・ ・ ・ Insertion piece (3a) (3b) ・ ・ Engagement piece (S) ・ ・ ・ ・ Slit ( The same reference numerals in the drawings indicate the same or corresponding parts.)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayoshi Tajima 1-6-7 Kawaramachi, Chuo-ku, Osaka City Tomen Indax Co., Ltd. (72) Inventor Toshiyuki Imai 1-87 Wakabayashi-cho, Yao-shi, Osaka Kashima Yao Ekimae Building, 2nd floor, Atomas Co., Ltd. (72) Inventor Toshinobu Nakamura 7-1, 1-1 Nishinakajima, Yodogawa-ku, Osaka City Nakamura Industrial Co., Ltd.

Claims (9)

[Claims] 1. A container main body (1) which is formed into a box shape by folding a blank sheet and opens upward, and the container main body.
(1) consists of a connector (2) for connecting the end portions of the adjacent side walls (12) and (13) to each other, and the connector (2) comprises the sidewall (12) (1)
A packaging container having a structure in which the end portions of 3) are joined together in a state that they do not come off. 2. The packaging container according to claim 1, wherein the blank sheet includes a long sheet having a constant thickness, which is punched into a developed shape mainly of the container. 3. The engagement protrusions (14) are provided at the corner side ends of the side walls (12) (13), and both the engagement protrusions (14) are provided on both sides of the coupling tool (2). Fitting groove (21) (2)
The packaging container according to claim 2, further comprising (1), wherein each of the fitting groove portions (21) is configured to open to the side wall side and downward. 4. The packaging container according to claim 3, wherein the engaging convex portion (14) is a bent portion formed by folding a certain range from an edge of the blank sheet. 5. The corner side edges of the side walls (12) (13) are
A plurality of openings (15) (15) are provided, and the connecting tool (2) is a key-like projection that is press-fitted into each of the openings (15) (15) in a retaining state.
The packaging container according to claim 2, wherein a pair of contact plates (23) (23) having (22) (22) on the inner surface are flexibly connected. 6. The column (25) is provided in the center of the connecting tool (2), and L-shaped reinforcing plate portions (24) circumscribing the corners of the container main body (1) are provided at both upper and lower ends thereof. Providing the above-mentioned pad (23)
The packaging container according to claim 5, wherein the (23) is symmetrically and flexibly connected to the support column (25). 7. An auxiliary piece (16) is connected to one end of the side walls (12) (13) in the longitudinal direction to connect the auxiliary piece (16) to the side wall.
(12) A C-shaped or L-shaped holding piece (17) superposed on the other of the side walls (12) and (13) and laterally protruding from the other of the side walls (12) and (13) or one of the auxiliary pieces (16). Is projected from the opening (18) provided on the other side, and the connecting tool (2) connects the auxiliary piece (16) to the side wall (1).
2) The insertion piece (26) which is arranged along the position of the other of the (13) and which is inserted from above to the holding piece (17) protruding from the opening. The packaging container according to 2. 8. An auxiliary piece (16) is continuously provided on one longitudinal end of the side wall (12) (13) to connect the auxiliary piece (16) to the side wall.
(12) L-shaped engagement overlapping with the other of (13) and protruding inward at the other end of the side walls (12) and (13) and bending in a direction along the side wall from the protruding end Provided with a piece (3a), the auxiliary piece (16) is provided with a similar engagement piece (3b) that overlaps the engagement piece (3a) in a back direction, and the coupling tool (2) is downward. It has a vertically long hollow part that opens to
The side wall of the hollow portion has a slit that clamps the base ends of the engaging pieces (3a) (3b) in the direction along the side wall and opens downward.
The packaging container according to claim 2, wherein the packaging container is provided with (S). 9. The packaging container according to claim 7, wherein the auxiliary piece (16) is flexibly connected to one of the side walls (12) (13).