JPH08143034A - Built-up box made of synthetic resin - Google Patents

Abstract

PURPOSE: To easily perform a positioning at the time of building up, and make a hinge part stronger by absorbing a force being applied from the outside by a method wherein on a side plate to which a lid plate is connected, and a tapered surface at a hinge part of the side plate, which is confronted with the side plate across a bottom plate, a protruding part which extends in the direction of a groove, and a notch part which is engaged with the protruding part are formed. CONSTITUTION: A hinge part 11 which connects respective plates 1, 3, 5, 7, 9, 10 and makes them foldable is a recessed-form groove, and is constituted in such a manner that a vertical surface 11 being perpendicular to a bottom plate l is formed from both ends of a thin bending part 110 which is in parallel with the bottom plate 1, and tapered surfaces 112 are formed from the upper end of the vertical surface 111. The confronted angles of the tapered surface 112 cross at approx. 90 deg. so that respective plates may become a right angle when being butted to each other and assembled. In addition, at appropriate locations in the direction of the groove of the tapered surface 112, a protruding part 113 which extends in the direction of the groove and a notch part 114 are formed. When being assembled, the protruding part 113 and notch part 114 are engaged with each other. Since a positioning is assuredly done by the engagement of these both parts, a built up box can be correctly assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly box that can be easily assembled from an unfolded state and can be easily unfolded. More specifically, the invention relates to a rectangular bottom plate, side plates and lid plates via hinges. The present invention relates to a synthetic resin assembly box that is formed in a series and can be formed into a single plate-shaped body when unfolded.

[0002]

2. Description of the Related Art Conventionally, cans and bottles have been widely used as containers for soft drinks, juices, beers, etc., and cardboard boxes are generally used for packing these canned drinks and bottles. Then, the cardboard box is laid out in a horizontal state in order to maintain transportation efficiency and storage efficiency before being assembled in an automatic packaging line of a beverage company and packaging the cans.
The cardboard box is assembled into a box for the first time in an automatic packing line. In particular, since cardboard boxes are used in large quantities in route sales, it is desirable to be able to unfold them so that they can be transported in large quantities at one time when they are returned in the empty box state where cans are taken out. Cardboard boxes that can be easily deployed are widely used.

However, the cardboard box is disposable and cannot be used repeatedly. Since the cardboard box cannot be used repeatedly, there is a problem in terms of resource saving that has been proposed in recent years. Further, since all the assembled parts are glued, there is a problem that it takes time to open and fold after use. Furthermore, since it is a cardboard, it naturally has poor water resistance. Therefore, an assembly box made of synthetic resin has been proposed which can be assembled in place of the cardboard box and can be repeatedly used. Various boxes having various structures have been proposed as such a deployable and assembleable box, and one of them has a bottom plate, a side plate, and a lid plate connected to each other via hinges. . As an example of such an assembly box, there is a box described in JP-A-63-162458 and JP-A-3-87635.

[0004]

SUMMARY OF THE INVENTION In the assemblable box described in the above publication, a rectangular bottom plate and side plates are connected to four sides of the bottom plate via hinge portions, and one of the side plates also has a hinge portion. A lid plate is continuously provided through the hinge plate, and the hinge portion is provided with a convex shape and a concave shape which are engaged with each other when assembled at substantially the center of the V-groove-shaped opposing inclined surfaces. Further, in the unfolded state, it is possible to form a single plate having a flat surface without a step. However, since the freely assembled box is formed of a foamed thermoplastic resin in order to maintain good airtightness and improve cold insulation and heat insulation, it does not have a structure in which the side plates are engaged with each other during assembly. .
That is, the assembled state can be maintained only by fitting the fitting projection piece provided at the tip of each side plate into the fitting groove provided on the back surface of the lid plate.

By simply fitting the lid plate into the groove as described above, it is sure to be used as a box for packing heavy items such as canned drinks, and for handling the product by tilting it or carrying it with one hand during transportation. The assembled state cannot be maintained. Therefore, the conventional synthetic resin assembly box cannot be used as a packaging box for canned beverages. Further, since the bottom plate and the side plate and the side plate and the lid plate are only connected by the V-shaped groove-shaped hinge portion, if the hinge portion is made to have a normal thickness, habit remains in the hinge portion when the box is expanded. . for that reason,
There is a problem that it cannot return to a completely horizontal state when it is simply disassembled in its natural deployed state. Further, if the thickness of the hinge portion is made thin, there is a problem in durability, and when the hinge portion is unfolded, the tip portion of the side plate hangs down, and a perfect horizontal state cannot be maintained.

On the other hand, the conventional cardboard box is developed in a completely horizontal state until it is assembled in the automatic packing line. Since the automatic packing line of a beverage company is manufactured as an assembly of such a cardboard box, it is not possible to use an assembly box made of a synthetic resin that does not become a horizontally unfolded state. Therefore, there is a problem that the conventional synthetic resin-made assembly box cannot be used as a packaging box for canned beverages, and it cannot be put on the conventional automatic packaging line for cardboard boxes.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a synthetic resin assembly box which is easy to assemble and deploy. Further, the present invention provides a synthetic resin assembly box which, when unfolded, naturally becomes horizontal due to the weight of the side plate and does not hang down.
Further, the present invention provides an assembly box made of synthetic resin, which is a plate-shaped body having the same horizontal plane as a whole without any protrusions or steps on the upper and lower surfaces when unfolded. Further, the present invention provides a synthetic resin assembly box that can be applied to a conventional automatic packaging line for cardboard boxes in a beverage company.

[0008]

The present invention has the following configuration to achieve the above object. That is, according to the present invention, a rectangular bottom plate, side plates connected to the four sides of the bottom plate, a lid plate connected to one of the side plates, and these plates are connected in a freely expandable manner via hinge portions. In the assembly box to be installed,
The hinge portion forms a vertical surface perpendicular to the surface of the bottom plate from both ends of a thin-walled bent portion that is parallel to the surface of the bottom plate, and a taper that intersects with each other from the upper end of the vertical surface at an angle of approximately 90 degrees. A side plate that is formed by forming a surface, and at least the side plate that connects the cover plate and the side plate that extends in the groove direction at an appropriate position in the groove direction on the tapered surface of the hinge portion of the side plates that face each other with the bottom plate in between. It is characterized in that a convex portion and a notch portion that engages with the convex portion are formed.

Further, a hook-shaped locking piece for locking both side plates when the side plates are erected is projectingly provided on one side plate on the joining side of the adjacent side plates, and the other side plate has the locking piece. A protrusion is provided at the tip of a side plate other than the side plate that continuously connects the lid plate, and a hook shape is further provided at the end of the side plate that faces the side plate that continuously connects the lid plate. And a fitting groove into which the projecting piece fits, and a fitting hole into which the locking piece of the side plate facing the side plate that connects the lid plate are formed. And And, the hook-shaped locking piece and the protruding piece,
The inner surface when assembled is the same as the surface of each plate, the outer surface is cut out by a thickness of about half of the thickness of the side plate to form a thin wall, and the locking portion is formed to be the outer surface when assembled. It is preferable to provide a cutout portion for locking the locking piece on the surface. Further, it is preferable that a step portion is provided in contact with the fitting hole, and a locking piece of a side plate facing a side plate continuously provided with the lid plate is locked to the step portion.

[0010]

[Function] By making the bent portion of the hinge portion, which is a concave groove, thin in parallel with the surface of the bottom plate, since no habit remains when deployed, it is possible to maintain a perfect horizontal state even in a disassembled natural state. it can. In addition, the convex portion and the notch formed on the tapered surface of the hinge portion serve as positioning during assembly, and effectively absorb the force acting from the outside to make the hinge portion more robust. Since the locking piece and the locking portion projecting from the side plate do not protrude from the surface of the side plate, they can be formed into a perfect plate shape in the expanded state. The engaging piece is thinly formed by cutting out the outer surface when assembled to about half the thickness of the side plate, and the engaging portion engages the engaging piece on the outer surface when assembled. By providing the notch for stopping, the locking piece does not protrude from the outer surface of the side plate when assembled. Further, when a step portion is provided in contact with the fitting hole and the locking piece of the side plate facing the side plate that continuously connects the lid plate to the step portion is locked, the locking piece is projected from the outer surface of the lid plate. In addition, it is possible to maintain a robust assembled state without the need of being fitted to the fitting groove.

[0011]

Embodiments will be described below based on illustrated embodiments. FIG. 1 shows the unfolded state of the assembly box. To outline each configuration, side plates 3 and 5 are continuously provided on two sides of a rectangular bottom plate 1 that face each other in the longitudinal direction, and side plates 3 and 5 that face each other in the lateral direction. Side plates 7 and 9 are continuously provided on two sides. Further, a lid plate 10 is continuously provided on the side plate 3. And each plate 3, 5,
7, 9 and 10 are connected to each other via a hinge 11. Locking pieces 13 and 15 are projectingly provided at the side ends of the side plates 3 and 5 which are to be coupled to each other, and a locking piece 17 and a projecting piece 19 are provided at the tip of the side end 5. Further, the locking pieces 13,
A locking portion 20 for locking 15 is projected, and further,
A projecting piece 21 is formed at the tip. On the other hand, the locking piece 1 is provided on the three sides of the lid plate 10 where the hinge portion 11 is not formed.
7 and the fitting grooves 23 and 24 into which the projecting pieces 19 and 21 are fitted, and a fitting hole 25 into which the tip of the locking piece is inserted.

To assemble the assembly box, first, the side plates 3 and 5 are erected at right angles to the bottom plate 1, and then the side plates 7 and 9 are erected to engage the locking pieces 13 and 15 at the side ends of the side plates 3 and 5. Side plate 7,
The locking piece 20 of the side plate 5 is finally fitted into the fitting grooves 23 and 24 formed in the cover plate 10.
7 and the projecting piece 19 and the projecting piece 21 of the side plates 7 and 9 are fitted, and at the same time, the tip of the locking piece 17 is inserted into the fitting hole 25 to form a hexahedron box. As the synthetic resin for molding the assembly box, polypropylene is preferable in consideration of moldability and fatigue resistance of the hinge portion 11, but a resin such as polyethylene or polyvinyl chloride may be used.

Next, each of the above structures will be described in detail. The hinge portion 11 that connects each plate in a row and is bendable is shown in FIG.
As shown in FIG. 7, the groove 11 is a concave groove, and the vertical surface 11 is perpendicular to the bottom plate 1 from both ends of the thin bent portion 110 parallel to the bottom plate 1.
1 to form a taper surface 1 from the upper end of the vertical surface 111.
12 is formed. The width dimension of the bent portion 110 is smaller than the wall thickness dimension of the bottom plate 1, the height dimension of the vertical surface 111 is about half of the width dimension of the bent portion 110, and the opposing angles of the tapered surfaces 112 are different from each other. The plates are intersecting at about 90 degrees so that they are at a right angle when assembled by associating.

Further, a projection 113 and a notch 11 extending in the groove direction are formed at appropriate portions of the tapered surface 112 in the groove direction.
4 are formed. The convex portion 113 has a vertical plane 115 extending from the vertical plane 111 and a horizontal plane 1 extending parallel to the bottom plate 1.
16 is formed so as to project from the tapered surface 112 in a substantially triangular cross section. On the other hand, the notch 114 has a size that engages with the convex 113, and is formed on the tapered surface 112 opposite to the tapered surface 112 on which the convex 113 is formed. That is, the notch 114 is formed on the horizontal surface 1 extending from the upper end of the vertical surface 111 in parallel with the bottom plate 1.
The vertical surface 118, which extends in the same direction as the vertical direction 17, has a stepped shape. The width dimension of the horizontal surface 117 is substantially the same as the height dimension of the vertical surface 115 of the convex portion 113, and the height dimension of the vertical surface 118 is substantially the same as the width dimension of the horizontal surface 116 of the convex portion 113. There is.

When the projection 113 and the notch 114 are assembled, they engage with each other as shown by the chain line in FIGS. That is, the vertical surface 115 of the convex portion 113 is placed on the horizontal surface 117 of the cut portion 114, and the horizontal surface 116 is in contact with the vertical surface 118. At the same time, the tapered surfaces 112 abut each other. In the illustrated embodiment described above, the convex portion 113 and the notch portion 114 have the hinge portion 11 between the bottom plate 1 and the side plates 3 and 5, and the hinge portion 11 between the side plate 3 and the lid plate 10.
Was formed in the vicinity of both ends, but the formation position and the number thereof are not particularly limited. In addition, the convex portion 113 and the cut portion 1
14 may be formed on the hinge portion 11 between the bottom plate 1 and the side plates 7 and 9.

In this way, when the convex portion 113 and the notch portion 114 are formed at appropriate positions in the groove direction of the tapered surface 112, they are surely positioned by the engagement of the both, so that they are assembled correctly and will be described later. Stoppers 13 and 15 and locking portion 2
The locking with 0 can be performed easily and surely. Also,
As shown in FIG. 5, the engagement between the convex portion 113 and the cut portion 114 effectively absorbs the force in the direction of the arrow X and makes it robust.

Next, the structure of each plate will be described. First, the side plate 3 is connected to the bottom plate 1 via the hinge portion 11, and the other opposing side is connected to the lid plate 10 via the same hinge portion 11. As shown in FIGS. 1 and 8 to 10, locking pieces 13 and 15 that engage with the side plates 7 and 9 when assembled are provided at both ends of the side plate 3, respectively. The locking pieces 13 and 15 are notched by a thickness corresponding to the recessed portions 27 and 29. Further, projections 30 and 31 projecting at right angles toward the bottom plate 1 are formed on the projecting portions, and when assembled, the outside It is configured by forming the surface to be thin into a thin wall notched by about half the wall thickness.
Inclined surfaces 33, 35 are formed on the tip ends of the projections 30, 31. By the inclined surfaces 33 and 35, the protrusion 3
When the 0, 31 are engaged with the locking parts 20 of the side plates 7, 9, which will be described later, the projections 30, 31 are formed while elastically deforming the inclined surfaces 33, 35 gradually along the edges of the locking parts 20. Can be locked.

Next, the side plate 5 will be described. The side plate 5 faces the side plate 3 and is connected to the bottom plate 1 through a hinge portion 11. The side plates 5 have the same locking pieces 13 and 15 as the side plate 3 at both ends.
And a locking piece 17 and a protruding piece 19 are provided at the tip. As shown in FIGS. 10 and 11, the locking piece 17 is a projection piece 3 that fits into the fitting grooves 23 and 24 of the lid plate 10.
7 and a fitting projection 39 to be inserted into the fitting hole 25, and the projection 37 and the fitting projection 39 are formed by thinning out a surface which is an outer side when assembled, by about half the thickness. . The lid plate 10 and the side plate 5 are integrally assembled by engaging the fitting protrusion 39 with a step provided in contact with the fitting hole 25 of the lid plate 10.

On the three sides of the cover plate 10 where the hinge portion 11 is not formed, the projecting piece 37 of the locking piece 17 of the side plate 5 and the projecting piece 1 are provided.
The fitting grooves 23, 24 into which 9 are fitted are discontinuously formed, and further, the fitting hole 25 is formed in the fitting groove 23 into which the fitting projection 39 of the locking piece 17 is inserted. Has been done.
A step portion 40 is formed in contact with the fitting hole 25. The stepped portion 40 is the fitting groove 2 where the fitting grooves 23 and 24 are cut.
3 is formed on the opposite side to the engaging piece 17 and the fitting hole 2 is formed.
The insertion projection 39 is configured to engage with the step portion 40 when inserted into the step 5.

Next, the side plates 7 and 9 will be described. The side plates 7 and 9 are continuously provided on the lateral direction side of the bottom plate 1 via a hinge portion 11, locking portions 20 are provided on both sides, and a projecting piece 21 is formed on the tip portion. . As shown in FIGS. 8 and 9, the locking portion 20 is provided with a notch portion 41 having an upper opening on a surface which is an outer side when assembled. The projections 30 of the locking pieces 13 and the projections 31 of the locking pieces 15 of the side plate 3 and the side plate 5 are inserted into the notches 41 and locked. The side surfaces of the protrusions 30 and 31 are locked by the side wall 43 of the cutout portion 41, so that they are not accidentally detached. Therefore, the side plates 3 and 5 and the side plates 7 and 9 are assembled and integrally assembled by the engagement of the engagement pieces 13 and 15 and the engagement portion 20.

As is apparent from the above description, the locking piece 1
One of the features of the present invention is that the surfaces 3 and 15 and the engaging portion 20 are flush with the side plates on the inside surface of the box when assembled.
There is one. That is, by making the inner side when assembled into the same plane, the whole can be made the same horizontal plane as the bottom plate 1 even in the deployed state. Therefore, since the canned beverage can be slid and filled in the automatic packing line, the conventional automatic packing line for a corrugated box can be used as it is.

The case of assembling the box from the unfolded state will be described. First, one of the side plate 3 and the side plate 5 is erected and then the other is erected, or both are erected at the same time.
The standing of the side plates 3 and 5 may be bent at the hinge portion 11. When bent from the bent portion 111 of the hinge portion 11, the convex portion 113 fits into the notch portion 114 for positioning, and at the same time, the tapered surfaces 112 abut each other and the bottom plate 1 and the side plates 3, 5 intersect at right angles ( (See FIGS. 5 and 6). At this time, since the side plate 3 and the cover plate 10 are held in a smooth plate state, the cover plate 10 stands upright above the side plate 3.

Next, the side plates 7 and 9 are erected so that the locking portion 2
0 is pressed against the inclined surfaces 33, 35 of the locking pieces 13, 15 to gradually elastically deform and the projections 30, 31 are cut out.
Just fit in. As a result, the side plates 3, 5, 7 and 9 are integrally engaged with each other at their adjacent side edges to assemble a box having an open top. Lastly, the lid plate 10 is bent from the hinge portion 11 between the side plate 3 and the protrusion 21 of the side plates 7 and 9 is fitted into the fitting groove 23. Subsequently, the projection piece 37 and the projection piece 19 of the locking piece 17 are fitted into the fitting grooves 23 and 24, and the fitting projection 39 of the locking piece 17 is further inserted into the fitting hole 25 to engage the step portion 40. You can stop it. The lid plate 10 is securely closed by the locking piece 17, and the side plate 5 and the side plates 7, 9 are
Is coupled by the locking of the locking pieces 13 and 15 and the locking portion 20, so that the assembly is easy and the assembled state is reliably held.

The box assembled as described above has a lid plate 1
When the front end portion of 0 is pressed toward the fitting protrusion 39 of the locking piece 17 to release the engagement state with the step portion 40, the lid plate 10 is protruded from the fitting grooves 23 and 24 by the action of the hinge portion 11. 19,
21 can be detached and opened. Next, when the upper ends of the side plates 7 and 9 are pressed downward and rotated outward, the projections 30 and 31 of the locking pieces 13 and 15 are separated from the notches 41 and the locked state is easily released. To be done. In this way, the side plates 3, 5, 7, 9 and the lid plate 10 can be very easily deployed and, in the deployed state, the side plates 3, 5, 7, 9 and the lid plate 10 are held in a horizontal state with the bottom plate 1. To be done. Therefore, a large amount of stacking is possible in the deployed state, and storage and transportation can be efficiently performed.

The number of the locking pieces 13, 15 of the side plates 3, 5 may be one or more, and the projections 30, 31 may be formed in the opposite directions. Corresponding to the change of the locking pieces 13 and 15, the number of the locking portions 20 of the side plates 7 and 9 and the notch portion 41
It is natural to change the direction of. Further, the locking pieces 13 and 15 and the locking portion 20 are provided on opposite sides, the locking pieces 13 and 15 are provided on the side plates 7 and 9, and the locking portion 40 is provided on the side plate 3.
5 may be provided.

[0026]

According to the synthetic resin assembly box of the present invention, the side edges of two adjacent side plates can be joined to each other in an assembled state by a single touch simply by erecting the side plates. Also,
By fitting the upper end of the side plate into the fitting groove provided in the lid plate, it is possible to prevent the careless disengagement of the engaged state and to provide a robust assembly box. In addition, since there are no protrusions on both sides of the bottom plate, side plate and lid plate and they are smooth surfaces, they can be used in automatic packaging lines at beverage companies in place of conventional cardboard boxes, and after deployment work. Can be simplified and speeded up.

Since the bent portion of the hinge portion is wide, it does not have any habit, and when it is released from the joined state and deployed, it can be formed into a smooth plate shape. Therefore, it can be efficiently stored and transported without taking up space.

[Brief description of drawings]

FIG. 1 is a plan view showing a developed state of a box.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is an enlarged cross-sectional view of a convex portion and a cut portion of a hinge portion.

FIG. 6 is an enlarged sectional view of a hinge portion.

FIG. 7 is an enlarged perspective view showing a main part of a hinge part.

FIG. 8 is an explanatory perspective view showing an assembly operation state of adjacent side plates.

FIG. 9 is a partial perspective view showing a state where adjacent side plates are joined together.

FIG. 10 is a partially cutaway perspective view showing a state in which a side plate and a cover plate are combined with each other.

FIG. 11 is a perspective view showing an assembled state of the box.

[Explanation of symbols]

 1 Bottom plate 3 Side plate 5 Side plate 7 Side plate 9 Side plate 10 Lid plate 11 Hinge portion 13 Locking piece 15 Locking piece 17 Locking piece 19 Projecting piece 20 Locking section 21 Projecting piece 23 Fitting groove 24 Fitting groove 25 Fitting hole 27 Recess 29 Recess 30 Protrusion 31 Protrusion 33 Sloping surface 35 Sloping surface 37 Sloping piece 39 Fitting protrusion 40 Step portion 41 Notch portion 43 Side wall 110 Bending portion 111 Vertical surface 112 Tapered surface 113 Convex portion 114 Cutting portion 115 Vertical surface 116 Horizontal surface 117 Horizontal plane 118 Vertical plane

Claims (4)

[Claims] 1. A rectangular bottom plate, side plates connected to four sides of the bottom plate, a lid plate connected to one of the side plates, and each of these plates being expandably connected via a hinge portion. In the assembled box, the hinge part is formed by forming a vertical surface perpendicular to the surface of the bottom plate from both ends of a thin-walled bent part parallel to the surface of the bottom plate, and abutting each other from the upper end of the vertical surface. At this time, it is formed by forming tapered surfaces that intersect at approximately 90 degrees, and at least the side plate that continuously connects the lid plate and the tapered surface of the hinge portion of the side plates that face each other with the bottom plate interposed therebetween have an appropriate groove direction. A synthetic resin assembly box, characterized in that a protrusion extending in the groove direction and a notch engaging with the protrusion are formed at a location. 2. A hook-shaped locking piece for locking both side plates when the side plates are erected is projectingly provided on one side plate on the joining side of the adjacent side plates, and the other side plate has the locking piece. A protrusion is provided at the tip of a side plate other than the side plate that continuously connects the lid plate, and a hook shape is further provided at the end of the side plate that faces the side plate that continuously connects the lid plate. And a fitting groove into which the projecting piece fits, and a fitting hole into which the locking piece of the side plate facing the side plate that connects the lid plate are formed. The synthetic resin assembly box according to claim 1. 3. The hook-shaped engaging piece and the projecting piece are such that the inner surface when assembled is the same as the surface of each plate and the outer surface is cut out by about half the thickness of the side plate. Formed into a thin wall,
3. The engaging portion is provided with a cutout portion for engaging the engaging piece on a surface which is an outer side when assembled.
Assembly box made of the synthetic resin described. 4. The step according to claim 2, wherein a step portion is provided in contact with the fitting hole, and a locking piece of a side plate facing a side plate continuously provided with the lid plate is locked to the step portion. The synthetic resin assembly box described in 3.