JP2003312658A - Folding transport container and folding pallet box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding transport container and a folding pallet box, each of which has a structure to easily prevent a release failure and a decrease in strength due to the molding failure. <P>SOLUTION: The body 11 of the folding transport container comprises a bottom wall 12 of a square plate, and respective pairs of long side walls 13 and short side walls 14. The container body 11 can be folded by folding the long side walls 13 on the surface of the bottom wall 12 first, and then folding the short side walls 14 on the top of the folded long side walls. The long side walls 13 are provided with hollow ribs 32, 33, 36, and the short side walls 14 are provided with hollow ribs 72, 73, 76, the ribs being molded by hollow injection method and arranged on the surface of each side wall, and wall surface joints of the side walls 13, 14 contacting the hollow ribs are formed as thin-wall parts. In the case of the folding pallet box, the bottom wall 12 is replaced with a bottom member of a square plate having fork insertion holes. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable transport container and a foldable pallet box which are configured to be small and compact so that they can be stored and transported when not in use. More specifically, the present invention relates to a collapsible transport container and a collapsible pallet box in which hollow ribs are provided on the outer surface of a container body and side walls and bottom walls in contact with the hollow ribs are thinly formed.

[0002]

2. Description of the Related Art Conventionally, a rectangular tubular rib-like structure (hereinafter referred to as a hollow rib) having an indefinite hollow portion made of a synthetic resin has been manufactured by the sympress method or AGI (Asahi Ga).
s Injection) and other hollow injection molding methods. In this hollow injection molding method, first, a molten resin is injected into a cavity of a mold formed into a rectangular column for molding a hollow rib, and the cavity is filled with the molten resin of high temperature and high pressure to form a rectangular column (solid state). To fill. Then, when only the peripheral portion of the molten resin filled in the cavity is cured to such an extent that it loses fluidity, high-pressure gas is injected from a gas inlet provided at one end of the cavity,
The uncured molten resin existing near the center of the cavity is extruded in a direction away from the gas injection port. Then, the extruded molten resin is finally discharged from a resin discharge port opened at the other end of the cavity, and a hollow space (hollow portion) is formed in a region where the molten resin disappears. .

[0003]

However, in the conventional hollow injection molding method, it is necessary to increase the strength of the hollow rib by appropriately increasing the ratio of the cross-sectional area of the hollow portion to the hollow rib. In many cases, the high-pressure gas was injected without waiting for the peripheral edge of the molten resin to completely lose its fluidity. Therefore, when high-pressure gas is injected from the gas injection port, a part of the gas leaks to the plate-like structures such as the wall surfaces of the side walls and the side wall ribs that are in contact with the hollow ribs, and does not enter the inside of these structures. There was a high possibility that a molding failure that intentionally forms a hollow space would occur.

At this time, the side walls, side wall ribs, etc., which were caused by these molding defects, were originally thin plate-like structures, but a local layered structure was formed by sandwiching the hollow space therebetween. As a result, it becomes extremely weak in terms of strength. In addition, the hollow space has a high possibility of forming irregular spot patterns on the side walls, the side wall ribs, etc., resulting in a remarkable deterioration of the appearance.

The present invention has been made by paying attention to the problems existing in the prior art as described above. The purpose of the present invention is to provide a foldable transport container and a foldable pallet box which are capable of easily preventing a molding defect and easily preventing a decrease in strength due to the molding defect. To provide.

[0006]

In order to achieve the above object, a foldable transporting container according to the first aspect of the present invention is a quadrangular plate-shaped bottom wall and a foldable transportation container that stands upright along the periphery of the bottom wall. The container main body is formed in a rectangular box shape with a bottom from each pair of the first side wall and the second side wall provided, and at the lower end of each side wall, there is a turn for folding each side wall inward of the container main body. A foldable transport container configured to be foldable by providing a moving means and folding the first side wall on the upper surface of the bottom wall, and then folding the second side wall on the upper surface of the first side wall. A hollow rib having a hollow portion inside is provided on a wall surface of the side wall or the bottom wall, and a joint portion of the side wall or the bottom wall in contact with the hollow rib is formed thin.

The collapsible transporting container according to a second aspect of the present invention is the foldable transporting container according to the first aspect of the invention, wherein a gas or liquid is injected into the hollow rib at the time of molding to form a hollow portion. Alternatively, the wall surface of the side wall or the bottom wall located near the liquid inlet is formed thin.

A foldable transport container according to a third aspect of the present invention comprises a square plate-shaped bottom wall, and a pair of first side wall and second side wall which are provided upright along the periphery of the bottom wall. A bottomed rectangular box-shaped container body is provided, and at the lower end portion of each side wall, a rotating means for folding each side wall inward of the container body is provided, and the first side wall is placed on the upper surface of the bottom wall. After folding, by folding the second side wall to the upper surface of the first side wall,
A foldable transport container having a container body configured to be foldable, wherein a hollow rib having a hollow portion inside is provided on a wall surface of the side wall or the bottom wall, and a side wall or a bottom wall in contact with the hollow rib is joined. A hole is provided in the portion, and the hole is located near a gas inlet or a liquid inlet for forming a hollow by injecting gas or liquid into the hollow rib during molding. It is a feature.

According to a fourth aspect of the present invention, in the foldable transport container according to any one of the first to third aspects of the present invention, a reinforcing rib is joined to a hollow rib on the wall surface of the side wall or the bottom wall. And a reinforcing rib that is in contact with the hollow rib is thinly formed.

According to a fifth aspect of the present invention, in the folding pallet box, a rectangular plate-shaped bottom wall member having a fork insertion hole, and a pair of first wall members standing upright along the periphery of the bottom wall member are provided. The container main body is formed from a side wall and a second side wall in the shape of a rectangular box with a bottom, and the lower end of each side wall is provided with a rotating means for folding each side wall inward of the container main body. A foldable pallet box in which the container body is configured to be foldable by folding the side wall on the upper surface of the bottom wall member and then folding the second side wall on the upper surface of the first side wall. A hollow rib having a hollow portion inside is provided on a wall surface of an upper wall or a lower wall constituting the wall member, and a side wall or a joint portion of the bottom wall member which is in contact with the hollow rib is formed thin. To do.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 to 3, the container body 11 that constitutes the foldable transport container is made of synthetic resin (polypropylene or polyethylene).
Is formed into a rectangular box with a bottom. The container body 11 includes a bottom wall 12 formed in a rectangular plate shape, a pair of long side walls 13 as first side walls standing upright along one side edge of the bottom wall 12, and the bottom. A pair of short side walls 1 as second side walls that are erected along the opposite side edges of the wall 12.
4 and. The container body 11 of this foldable transport container is configured to be foldable by folding a pair of long side walls 13 on the upper surface of the bottom wall 12 and then folding a pair of short side walls 14 on the upper surface of the long side wall 13. There is.

On the lower surface of the bottom wall 12, a large number of bottom wall ribs 21 extending vertically and horizontally in a lattice pattern are hung so as to increase the strength of the bottom wall 12 while reducing the weight. These bottom wall ribs 21
A large number of ventilation holes 22 formed in a rectangular shape in a plan view are formed in the wall surface of the bottom wall 12 located in the middle portion between them.

A support ridge 23, which is formed in a substantially rectangular columnar shape (side section U-shape in cross section), is provided upright on one of the opposite side edges of the bottom wall 12 so as to connect adjacent corner portions of the container body 11. The long side wall 13 is supported by the upper end surface thereof. Bottom wall 12
On the other side edges facing each other, supporting ridges 24 formed in a substantially rectangular columnar shape (having an inverted U-shape in a normal cross section) are erected so as to connect adjacent corner portions of the container body 11, and an upper end surface thereof. Supports the short side wall 14. The support ridges 23 are formed at a height substantially the same as the thickness of the long side walls 13, and the support ridges 24 are formed at a height substantially the same as the sum of the thicknesses of the long side walls 13 and the short side walls 14. ing.

At the inner positions of the upper ends of the support ridges 23 and 24, there is a bearing portion 25 which constitutes a rotating means at a predetermined interval.
Are recessed in a substantially square hole shape. Further, as shown in FIG. 3, a pair of left and right housing recesses 26 formed in a rectangular shape on the front surface are provided at a predetermined depth on the outer side of the support projection 23.

As shown in FIGS. 1 and 2, at the inner position of the lower end portion of the long side wall 13, a rotating shaft portion 31 forming a rotating means formed in a substantially rectangular columnar shape is hung at predetermined intervals. ing. Further, a pair of left and right rotating shafts 31a, which form a rotating means formed in a horizontal column shape, are provided on both side surfaces of the lower end portion of each rotating shaft portion 31 so as to extend in the horizontal direction. The ridge 23 is rotatably mounted in the bearing portion 25 of the ridge 23. With this configuration, the long side wall 13 is rotated inward of the container body 11 and is difficult to be rotated outward of the container body 11.

On the outer surface of the long side wall 13, lower hollow ribs 32, upper hollow ribs 33 and upper flanges 34 are provided which extend laterally so as to connect both sides of the long side wall 13. Each of the lower hollow rib 32 and the upper hollow rib 33 as a hollow rib is formed in a horizontally extending rectangular tube shape, and has an indefinite shape (a substantially circular side section or a substantially square shape) inside thereof. Parts 35a and 35b are provided. The upper flange 34 is formed in a rectangular plate shape extending along the horizontal plane from the outer side of the upper edge of the long side wall 13. Further, the base end portion (upper end portion) of the rotary shaft portion 31 is joined to the lower surface of the lower hollow rib 32. In addition,
The height difference between the upper end of the wall surface of the long side wall 13 and the upper hollow rib 33 (center) is preferably 1/3 or less, and more preferably 1/4 or less of the total height of the wall surface of the long side wall 13.

On the other hand, on both side outer surfaces of the long side wall 13, a pair of left and right side portions as hollow ribs vertically connecting the end portions of the lower hollow ribs 32 and the upper hollow ribs 33 are formed. Hollow ribs 36 are provided. The side hollow ribs 36 are formed in a rectangular tube shape extending in the up-down direction, and have an indefinite shape (planar cross-section substantially circular shape or substantially quadrangular shape) hollow portion 35c provided therein.

Further, the upper and lower ends of the side hollow ribs 36 are joined to the ends of the lower hollow rib 32 and the upper hollow rib 33, and the hollow portion 35c in the hollow rib 36 is the hollow portion 35a, It is connected to 35b. And
Due to these hollow ribs 32, 33, 36, a first annular rib 37 as a hollow rib formed in a square shape when viewed from the front is provided on the outer surface of the long side wall 13 in a protruding manner. The distance between the one side wall edge of the long side wall 13 and the side hollow rib 36 (center) is preferably 1/8 or less, more preferably 1/10 or less, of the total width of the wall surface of the long side wall 13. More preferably, it is 1/15 or less.

As shown in FIG. 2 (a), engaging recesses 41 are formed on both left and right sides of the long side wall 13 by forming recesses at the upper positions of the outer side portions thereof in the shape of a long rectangular front.
Is provided. At the lower portion, the central portion and the upper end portion of the engaging recessed portion 41, restriction protrusions 42a, 42b and 42c forming a restriction member formed in a substantially U-shape on the front surface extend to the outside of the long side wall 13. Is projected on. Further, on the outer side of the upper end surface of the regulation convex portion 42c, the engaging convex portion 4 formed in a substantially quadrangular prism shape (quadrilateral front shape, side trapezoidal shape).
3 is projected. Further, a pair of vertical ribs 45a, 45b, 45c extending in the vertical direction as reinforcing ribs are provided on the outer surface of the upper end portion of the long side wall 13 located between the upper hollow rib 33 and the upper flange 34 so as to project in the vertical direction. There is.

As shown in FIGS. 1 and 2 (b), a rotating shaft portion 31 constituting a rotating means formed in a substantially rectangular column shape at a predetermined interval at an inner position of a lower end portion of the short side wall 14. Is drooping. On both side surfaces of the lower end portion of the rotary shaft portion 31,
A pair of left and right rotating shafts 31a constituting a rotating means are provided in a protruding manner, and are rotatably mounted in the bearing portion 25 of the supporting projection 24 so as to be rotatable. With this configuration, the short side wall 14 is rotated inward of the container body 11 and is difficult to be rotated outward of the container body 11.

On the outer side surface of the short side wall 14, lower hollow ribs 72 and upper hollow ribs 73 are provided which extend laterally so as to connect both sides of the short side wall 14. The lower hollow ribs 72 and the upper hollow ribs 73 as hollow ribs are both formed in a horizontally extending rectangular tube shape, and have an indefinite shape (generally circular cross section or substantially square shape) inside thereof. Parts 75a and 75b are provided. Also,
The base end portion (upper end portion) of the rotating shaft portion 31 is joined to the lower surface of the lower hollow rib 72.

On the other hand, on the outer surfaces of both sides of the short side wall 14, a pair of left and right side portions as hollow ribs vertically connecting the end portions of the lower hollow rib 72 and the upper hollow rib 73 are formed. Hollow ribs 76 are provided. The side hollow ribs 76 are formed in a rectangular tube shape extending in the up-down direction, and have an indefinite shape (planar cross-section substantially circular shape or substantially quadrangular shape) hollow portion 75c provided therein. Further, the upper and lower ends of the side hollow ribs 76 are hollow ribs 72, 73.
The hollow portion 75c in the hollow rib 76 is connected to the end portions of the hollow ribs 75a and 75b. And, by these hollow ribs 72, 73, 76,
On the outer side surface of the short side wall 14, a second annular rib 77, which is a hollow rib formed in a square shape when viewed from the side surface, is provided in a protruding manner.

At the center of the upper ends of the pair of short side walls 14 facing each other, a grip hole 7 as a hole formed in a side-view rectangular shape.
8 are pierced. The upper hollow rib 73 is provided at the upper end portion of the grip hole 78, and the frame portions 78a are provided at the lower end portion and both side portions, so that the strength of each grip hole 78 is increased.

As shown in FIGS. 2 (b), 3 and 4,
At both sides of the short side wall 14, a regulation plate 81, which constitutes a regulation means formed in a substantially long rectangular plate shape, is projected so as to extend inward of the short side wall 14 (parallel to the long side wall 13). It is adapted to be accommodated in the engaging recess 41 of the side wall 13.
From the lower end of the back surface (inner side surface) of the regulation plate 81 to the central portion,
It is formed so as to slightly project inward of the container body 11, and when the container body 11 is assembled, the long side wall 1
It is arranged so as to be able to come into contact with the outer side surface of the engagement recess 41 of No. 3, and restricts the long side wall 13 from rotating outward of the container body 11. Further, as shown in FIG. 3B, these regulation plates 81 are housed in the housing recesses 26 of the support projections 23 when the container body 11 is folded.

As shown in FIGS. 2B and 4, the lower end portion, the central portion, and the upper end portion of the regulating plate 81 are provided with regulating holes 82a, 82b, 82c forming a regulating means in the shape of an oblong square hole. It is set up. These restriction holes 82a, 82b, 82c are
The restriction projections 42a, 42b, 42c projectingly provided on the outer surface of the engagement recess 41 of the long side wall 13 are configured to be engaged, and when the container body 11 is assembled by the engagement relationship, the short side wall is formed. The rotation of the container 14 to the outside of the container body 11 is restricted. The restriction hole 82c
Is engaged with the tip portion of the restriction protrusion 42c, and the restriction hole 82a,
82b is configured to be engaged with the entire restricting convex portions 42a, 42b. In addition, an engaging projection 83 formed in a substantially quadrangular prism shape (rectangular front shape, trapezoidal side surface) hangs down from the lower surface of the upper end portion of the restricting plate 81 located above the restricting hole 82c, and the container main body 11 When assembled, the engaging projection 43 of the upper end of the restriction projection 42c is engaged.

As shown in FIGS. 2 (a) and 5, the outer surface of the long side wall 13 located above the upper hollow rib 33 is
The upper thin portion 92 is provided by forming the wall surface of the long side wall 13 to be thin. This upper thin portion 92
Is the long side wall 13 in contact with the upper end of the base end of the upper hollow rib 33.
Is formed so as to have a thin wall with a substantially uniform thickness over a predetermined width d.
Further, the upper thin portion 92 is formed so as to extend in the horizontal direction along the upper hollow rib 33, and is also formed so as to connect the left and right side portions of the long side wall 13. The upper thin portion 92 injects high-pressure gas from a gas injection port provided in the cavity of the molding die so as to open to the outer center portion of the upper hollow rib 33, and the upper hollow rib 33 is closed.
It is provided in order to prevent the gas from leaking out to the long side wall 13 when the hollow portion 35b is formed inside and to prevent the occurrence of defective molding.

The thickness of the upper thin portion 92 is preferably 80 to 95 with respect to the thickness of the long side wall 13 (wall surface).
%, More preferably 80 to 90%. When the thickness of the upper thin portion 92 is less than 80% of the thickness of the long side wall 13, the strength of the long side wall 13 may be reduced. On the contrary, 9
If it exceeds 5%, it may not be possible to effectively prevent the high-pressure gas from leaking out. Also,
The predetermined width d is preferably 5 to 20 mm. If the predetermined width d is less than 5 mm, it may not be possible to effectively prevent the high-pressure gas from leaking out. On the other hand, if it exceeds 20 mm, the strength of the long side wall 13 may decrease.

At the lower ends of the vertical ribs 45a, 45b, 45c located above the upper hollow rib 33, the vertical ribs 4 are provided.
The second upper thin portion 93 is provided by forming one side surface or both side surfaces of 5a to 45c to be thin. These second upper thin portions 93 are formed by forming the side surfaces (joint portions) of the vertical ribs 45a to 45c that are in contact with the upper end surfaces of the upper hollow ribs 33 to have a substantially uniform thickness over a predetermined width. Has been done. The lower base end portions of the vertical ribs 45a to 45c that are in contact with the upper thin portion 92 may or may not be thin. The thickness of the second upper thin portion 93 is preferably 8 with respect to the thickness of the vertical ribs 45a to 45c for the same reason as in the case of the upper thin portion 92.
It may be 0 to 95%, and more preferably 80 to 90%.

On the other hand, on the outer surface of the long side wall 13 located below the upper hollow rib 33, by forming the wall surface of the long side wall 13 into a thin wall, the lower thin wall having the same structure as the upper thin wall portion 92 is formed. A section 94 is provided. The lower thin portion 94 is formed by forming the wall surface (joint portion) of the long side wall 13 in contact with the lower end of the base end portion of the upper hollow rib 33 so as to have a substantially uniform thickness over a predetermined width d. ing. Further, the lower thin portion 94 is formed so as to extend horizontally along the upper hollow rib 33, and is also formed so as to connect the left and right side portions of the long side wall 13.

On the outer surface of the long side wall 13 which is in contact with the pair of left and right side hollow ribs 36, by forming thin wall surfaces on both left and right sides of the long side wall 13, a pair of left and right side wall thin portions are formed. 95 is provided. The thin side wall portions 95 are one side portion (inner side portion) of the base end portion of the side hollow rib 36.
It is configured by forming the wall surface (joint portion) of the long side wall 13 in contact with the thin wall portion having a substantially uniform thickness over a predetermined width d. Furthermore, these side thin portions 95 are
It is formed so as to extend in the vertical direction along the side hollow rib 36, and is provided only in the central portion of the long side wall 13.

In addition, these side thin portions 95 are formed so as to extend continuously from the lower thin portion 94. The lower thin wall portion 94 and the pair of side thin wall portions 95 provided so as to continuously extend to the outer side surface of the long side wall 13 have a front inverted U shape at the center of the outer side surface of the long side wall 13. The formed thin portion 96 is provided.

As shown in FIG. 1A, a pair of left and right thin-walled portions 97 are formed on the outer surface of the upper corner portion of the short side wall 14 in the shape of an inverted L-shaped side surface. These thin parts 97
Has a structure similar to that of the thin portion 96, except that it is formed so as to avoid the grip hole 78 as a hole portion.

The operation of the foldable transportation container will be described below. The container body 11 of this foldable transport container includes a bottom wall 12 and a pair of opposing long side walls 13.
And the short side wall 14 are separately injection-molded and then assembled. At this time, the long side wall 1
No. 3 first annular rib 37 and second annular rib 7 of the short side wall 14
7 is the Sympress method or AGI (Asahi Gas Injection)
And the like by a hollow injection molding method (gas-assisted injection molding method).

The molding die for hollow injection molding the long side wall 13 is a partially improved upper and lower pair of injection dies including a moving die (upper die) and a fixed die (lower die). It is used while being done. In the fixed die of this molding die, a gas injection port 101 is provided at a central position on the outer side of the upper hollow rib 33 shown by a dotted line in FIG. 2A, and from this gas injection port 101. High-pressure gas can be injected into the upper hollow rib 33. Further, this fixed mold is provided with a pair of left and right resin discharge ports 102 at the center position of the outer side of the lower hollow rib 32.
The uncured molten resin extruded from inside the hollow ribs 33, 36, 32 can be discharged to a resin accommodating portion (not shown) in the mold.

When the long side wall 13 is hollow-injection-molded, first, a pair of molding dies including a moving die and a fixed die are clamped and formed in both dies. The high temperature and high pressure molten resin is injected and completely filled into the cavity having the outer surface shape of the long side wall 13. Next, when the molten resin forming the entire long side wall 13 excluding the first annular rib 37 and the peripheral portion of the first annular rib 37 is cured to such an extent that it loses fluidity, the outer surface of the central portion of the upper hollow rib 33 is removed. High-pressure gas is injected into the inside of the upper hollow rib 33 from the gas injection port 101 of the fixed mold which is opened at.

At this time, the uncured molten resin existing in the vicinity of the central portion of the upper hollow rib 33 is sequentially extruded in the direction away from the gas inlet 101 by the injection of high-pressure gas, and then inside the both-side hollow ribs 36. The uncured molten resin is extruded in sequence. Further, these molten resins sequentially extrude the uncured molten resin in the lower hollow ribs 32, and finally pass through the resin discharge port 102 opened on the outer surface of the central portion of the lower hollow ribs 32 to reach the resin housing portion. Is discharged. As a result, in the inner portion (center portion) of the first annular rib 37, an indeterminate hollow region (having a substantially circular cross section or a substantially square shape) in which the molten resin has disappeared is formed, and the hollow portion of the first annular rib 37 is formed. 35a, 35b,
35c.

Finally, the long side wall 1 including the first annular rib 37
After the whole 3 is cured, the molding die is opened and the long side wall 13 formed is taken out from the die. The same is true when hollow sidewall 14 is injection-molded. In addition, in the short side wall 14, the gas injection port 101 is configured to be located at the center of the outer side of the upper hollow rib 73 as shown by the dotted line in FIG. 1A, and the pair of resin discharge ports 102.
Is configured to be located at the center of the outer side of the lower hollow rib 72. Further, in the short side wall 14, since the central portion of the upper hollow rib 73 in which the gas inlet 101 is opened is provided with the grip hole 78 as a hole portion, the short side wall can be provided in any of front, rear, left and right directions. The wall surfaces of 14 are not in contact with each other, so that the molding failure due to the leakage of the high pressure gas is not caused.

In this foldable transport container, a pair of long side walls 13 facing each other are folded and placed on the upper surface of the bottom wall 12, and then a pair of remaining short side walls 14 opposite to each other are folded. By folding on the upper surface of 13, it is folded compactly into a flat plate shape as shown in FIG. 3 (b). At this time, the restriction plates 81 projectingly provided on both sides of the short side wall 14 are provided in the accommodation recess 2 of the support projection 23.
The upper end surface of the short side wall 14 in the folded state is accommodated in the interior 6 and is arranged at a low position. Further, the container main body 11 of this foldable transport container can be stacked vertically in a folded state.

On the other hand, when assembling the container body 11 in the folded state, the pair of short side walls 14 are pivoted upward by 90 ° about the pivot shaft 31a so as to stand on the upper end surface of the support projection 24. After being installed, the remaining pair of long side walls 13 is similarly rotated to stand on the upper end surface of the support projection 23. As shown in FIG. 4, when the long side wall 13 is erected on the support projection 23, first, the restriction projections 42 projecting on both sides thereof are provided.
The tip portions of a, 42b, 42c are engaged in the regulation holes 82a, 82b, 82c of the regulation plate 81 of the adjacent short side walls 14. Subsequently, the tip ends of the restriction protrusions 42a and 42b enter into the inner portions of the restriction holes 82a and 82b, and the engagement protrusion 43 of the upper end of the restriction protrusion 42c engages with the engagement protrusion of the upper end of the restriction plate 81. Get over while sliding on the surface of the strip 83.

As a result, the container body 11 in this assembled state
Is in a state in which the engagement protrusion 43 provided on the long side wall 13 and the engagement ridge 83 of the short side wall 14 are engaged with each other, and the long side wall 13 rotates inward of the container body 11. Is prevented. Further, the restriction plate 81 of the short side wall 14 is
Since the projections are provided so as to cover the outer side surfaces of both side portions of 3, the outward rotation of the long side wall 13 is also restricted. Therefore, the long side wall 13 in this assembled state is regulated to rotate inward and outward of the container body 11, and is vertically fixed on the upper end surface of the support protrusion 23.

The pair of left and right short side walls 14 is the long side wall 1.
Since it is arranged in contact with the side edge of 3,
The inward rotation of the container body 11 is prevented. further,
As shown in FIG. 3 (a), the respective restriction projections 42 a, 42 b, 42 c on both sides of the long side wall 13 are inserted into the restriction holes 82 a, 82 b, 82 c provided in the restriction plate 81 of the short side wall 14. Therefore, the outward rotation of the short side wall 14 is also restricted. Therefore, the short side wall 14 in this assembled state is regulated to rotate inward and outward of the container body 11, and is vertically fixed on the upper end surface of the support projection 24.

The foldable transport container in this assembled state is transported while the fingers are inserted into the pair of gripping holes 78 facing each other and the upper hollow rib 73 is gripped by the hand. Alternatively, as shown in FIG. 1A, the fingers 111 other than the thumb may be carried while being hooked on the lower surfaces of the pair of upper hollow ribs 33 or the pair of upper hollow ribs 73 facing each other. At this time, the thumb 111a shown in FIG.
The front end portion, the central portion or the base end portion of the container is arranged so as to abut the upper end edges (upper flange 34) of the side walls 13 and 14, and the container body 11 is transported in an extremely stable state.

On the other hand, the container body 11 of this foldable transport container can be vertically stacked in the assembled state, and the folded container body 11 can be stacked above and below the assembled container body 11. .
Further, when dust, dirt or the like adheres to the container body 11 of the foldable transport container, the container body 11 is washed with water to wash away the dirt and then dried, and is reused repeatedly.

The effects exhibited by the above embodiment will be described below. The foldable transport container according to the embodiment has a rectangular plate-shaped bottom wall 12, and a pair of long side walls 13 and short side walls 14 that are provided upright along the periphery of the bottom wall 12.
It is composed of a container body 11 formed in a rectangular box shape with a bottom. Furthermore, at the lower ends of the side walls 13 and 14,
A rotary shaft portion 31 and a bearing portion 25 for folding each of the side walls 13 and 14 inward of the container body 11 are provided. After the pair of opposing long side walls 13 are folded on the upper surface of the bottom wall 12, the remaining It is configured to be foldable by folding a pair of short side walls 14 on the upper surface thereof. In addition, in this collapsible transport container, hollow ribs 33, 36, 73, 76 are provided on the wall surfaces of the side walls 13, 14 in a protruding manner, and the side walls 13, which are in contact with the respective hollow ribs 33, 36, 73, 76, 14
Is formed so that the wall surface (joint portion) thereof is locally thin.

That is, in this foldable transport container, the thin wall portion 92 is formed by forming the wall surface joints of the side walls 13 and 14 in contact with the hollow ribs 33, 36, 73 and 76 to be thin over a predetermined width. , 93, 94, 95, 96,
97 is provided. Therefore, the hollow ribs 32, 3
At the time of injecting the high-pressure gas for forming 3, 36, 72, 73, 76, it is difficult for the high-pressure gas to leak through the narrow gap between the mold split (PL) surfaces for forming the thin portions 92 to 97. . As a result, the high pressure gas becomes
It is possible to easily and surely prevent a molding defect due to the leakage to the wall surface of, and it is possible to easily and surely prevent a decrease in strength and a deterioration in appearance due to the molding defect. In particular, since olefinic synthetic resins such as polyethylene and polypropylene have high fluidity when melted, high-pressure gas easily leaks during hollow injection molding, but the thin-walled portions 92 to 97 of the present embodiment are The synthetic resin having high fluidity can be prevented from leaking out very effectively.

In this foldable transport container, the wall surfaces of the side walls 13 and 14 (near the gas injection port 101 for injecting gas into the hollow ribs 32, 33, 36, 72, 73 and 76 at the time of molding ( The joint portion) is formed to be thin. For this reason, it is possible to prevent the gas from leaking out from the side walls 13 and 14 near the gas inlet 101 (the position closest to the gas inlet 101) where the gas is injected at the highest pressure, and to prevent defective molding. It can be suppressed very effectively.

The short side wall 1 of this foldable transport container
4, the grip hole 7 is provided at a position below the center of the upper hollow rib 73.
It is opened so that 8 may contact. Therefore, in the short side wall 14, the central portion of the upper hollow rib 73 in which the gas inlet 101 is opened is not in contact with the wall surface of the short side wall 14 in any of the front, rear, left, and right directions, and the high pressure gas is Since there is no gap through which gas leaks, it is possible to easily and surely prevent defective molding due to gas leakage.

The embodiment can be modified and embodied as follows. Forming a mesh shape by penetrating a large number of ventilation holes in the wall surfaces of the side walls 13 and 14. Even when configured in this way, the side wall 1
Since no protrusions are provided on the wall surfaces of 3, 14,
Similar to the above-described embodiment, washing with water can be performed very easily.

Further, it is preferable that some of the ventilation holes are provided on the wall surface of the long side wall 13 (the central portion of the upper thin portion 92 or the lower thin portion 94) which is in contact with the vicinity of the central portion of the upper hollow rib 33. With this structure, the vent hole serving as the hole portion can easily prevent a molding defect when the long side wall 13 is subjected to hollow injection molding, and also easily prevent a decrease in strength due to the molding defect. can do.

In the hollow injection molding method for molding the annular ribs 37, 77, a liquid such as water may be used in addition to a gas such as an inert gas. -The bottom wall 1 is provided along the outer peripheral edge of the lower end portion of the bottom wall 12 and has a bottom hollow rib as a hollow rib formed in a bottom surface square shape (square ring shape), and is in contact with the bottom hollow rib.
Form the wall surface (joint part) of No. 2 to be thin. Even in the case of such a configuration, it is possible to easily prevent a molding defect, and it is possible to easily prevent a decrease in strength of the bottom wall 12 due to the molding defect.

The bottom hollow rib does not need to be continuously provided along the outer peripheral edge of the lower end portion of the bottom wall 12, for example, slightly at the center of the side edge of the bottom wall 12 or at the corner portion. It may be formed into a substantially square bottom shape while being divided. That is, the hollow ribs formed in the L-shape on the bottom surface may be provided at the respective corner portions of the bottom wall 12 to provide the bottom hollow ribs formed in the substantially B-shape on the bottom surface, or each side edge of the bottom wall 12 may be formed. You may provide the bottom hollow rib formed in the substantially square-bottom shape by each pair of opposing hollow ribs extended in a long rod shape along. Further, a bottom hollow rib formed in a substantially square bottom shape ([]) may be provided by a pair of opposed hollow ribs formed in a bottom C shape.

A foldable pallet box may be provided by providing a fork insertion hole for inserting a fork of a forklift or a handlift at the lower end of the bottom wall 12 of the foldable transport container of the above embodiment.
That is, in this foldable pallet box, the bottom wall 12 of the above embodiment is used as an upper wall (top deck), and a bottom plate member having a substantially rectangular plate shape (a substantially rectangular parallelepiped shape) having a fork insertion hole provided at a lower position thereof. The container main body includes a pair of long side walls 13 and a pair of short side walls 14 having the same configuration as the above embodiment. Even in the case of such a configuration, it is possible to easily prevent defective molding, and it is possible to easily prevent strength reduction due to the defective molding. In addition, the upper wall or the lower wall of the bottom wall member (bottom deck)
Hollow ribs and thin portions having the same configuration as the above embodiment may be provided on the wall surface constituting the above.

In addition to the thin portion 96 of the above embodiment,
On the wall surface (joint portion) of the long side wall 13 in contact with the lower end portion of the side hollow rib 36 and the lower hollow rib 32, a thin U-shaped portion having the same configuration as the thin portion 96 is provided. It may be a thin front-walled square annular thin portion that extends continuously along the annular rib 37.

The upper thin portion 92 and the lower thin portion 94 may be provided only in the central portion of the upper end of the long side wall 13. Even with such a configuration, the thin-walled portions 92 and 94 formed near the gas inlet 101 can easily prevent a molding defect that is likely to occur when the high-pressure gas is injected.

The thin portion 97 may be omitted. Even in the case of such a configuration, since the gripping hole 78 as a hole is formed near the gas injection port 101, it is possible to easily prevent a molding defect that is likely to occur when the high pressure gas is injected.

For example, as shown in FIG. 6A, the lower hollow rib 72 is omitted, and a flat plate-shaped side wall rib 211 is formed along the lower edge of the short side wall 14 (similar to the upper flange 34). Be provided. Furthermore, the side hollow ribs 76
A pair of left and right lower hollow ribs 212 as hollow ribs that slightly extend inward of the short side wall 14 may be provided at the lower end of the.

Further, a lower thin portion 73a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the upper hollow rib 73. Further, the thin side wall portion 76 a may be provided on the wall surface (joint portion) of the short side wall 14 in contact with the hollow side rib 76. Also,
A thin portion may be provided on the wall surface (joint portion) of the short side wall 14 in contact with the lower hollow rib 212.

For example, as shown in FIG. 6 (b), an upper hollow rib 73 is provided at a position where the remaining finger 111 is hooked while the thumb 111 a is in contact with the upper edge of the short side wall 14. Further, the upper end of the short side wall 14 is provided with a plate-shaped upper flange 34 extending along the upper end edge thereof.
Further, a lower thin portion 73a and an upper thin portion 73b are provided on the wall surface (joint portion) of the short side wall 14 in contact with the upper hollow rib 73. In addition, the short side wall 1 in contact with the side hollow rib 76
The side thin portion 76a may be provided on the wall surface (joint portion) of No. 4.

Providing a central hollow rib 216 as a hollow rib extending in the lateral direction as shown in FIG. 6C, for example, at approximately the center height of the wall surface of the short side wall 14. In addition,
The central hollow ribs 216 include side hollow ribs 36, 76.
Is configured to communicate with the central portion of the.

Further, a lower thin portion 73a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the upper hollow rib 73. Further, the thin side wall portion 76 a may be provided on the wall surface (joint portion) of the short side wall 14 in contact with the hollow side rib 76. Also,
A thin portion may be provided on the wall surface (joint portion) of the short side wall 14 in contact with the central hollow rib 216. Further, a thin wall portion may be provided on the wall surface (joint portion) of the short side wall 14 that contacts the lower hollow rib 72.

At the center of the short side wall 14, for example, as shown in FIG.
Providing a central hollow rib 217 as a hollow rib extending in the vertical direction as shown in (d). The central hollow ribs 217 are configured to communicate with the central portions of the upper hollow ribs 73.

Further, a lower thin portion 73a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the upper hollow rib 73. In addition, the side hollow ribs 76 or the central hollow ribs 217
The thin side wall portion 76 is formed on the wall surface (joint portion) of the short side wall 14 in contact with
a or the central thin portion 217a may be provided.

For example, as shown in FIG. 7A, omit the side hollow ribs 76 and the lower hollow ribs 72. Further, a lower thin portion 73a is provided on the wall surface (joint portion) of the short side wall 14 in contact with the upper hollow rib 73.

For example, as shown in FIG. 7B, two upper hollow ribs 73 and 221 extending in the lateral direction are provided at the upper end of the short side wall 14. The two upper hollow ribs 73, 221 may be configured to communicate with each other via a side hollow rib 222 provided on one side of the short side wall 14. Also, these two upper hollow ribs 73, 2
The side walls 21 may be connected to each other through the side hollow ribs 222 provided on both sides of the short side wall 14 to form a side surface square ring shape.

Further, a lower thin portion 73a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the upper hollow rib 73. In addition, the thin side wall portion 222a may be provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the hollow side rib 222. Further, a thin wall portion may be provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the upper hollow rib 221.

As shown in FIG. 7C, for example, the side hollow ribs 76 are omitted, and the center hollow ribs 226 as hollow ribs extending in the horizontal and vertical directions are provided in the center of the short side wall 14. Provide 227. Further, thin-walled portions 226a and 227a are provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the central hollow ribs 226 and 227.
Further, the upper thin portion 72a or the lower thin portion 73a may be provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the lower hollow rib 72 or the upper hollow rib 73.

For example, as shown in FIG. 7D, the side hollow rib 76 is omitted, and the upper hollow rib 221 as a hollow rib is provided at the upper end of the short side wall 14.
The hollow portion 221a of the upper hollow rib 221 does not have to extend to both side edges (both sides) of the side walls 13 and 14. Further, an upper thin portion 221b and a lower thin portion 221c are provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the upper hollow rib 221.

For example, as shown in FIG. 8A, the upper hollow rib 73 and the side hollow rib 76 may be omitted.
Further, the upper thin portion 72a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the lower hollow rib 72.

For example, as shown in FIG. 8B, two lower hollow ribs 72, 228 extending in the lateral direction are provided at the lower end of the short side wall 14. The two lower hollow ribs 72, 228 may be configured to communicate with each other via a side hollow rib 229 provided on one side of the short side wall 14. In addition, these two lower hollow ribs 72, 2
The side walls 28 may be connected to each other via the side hollow ribs 229 provided on both sides of the short side wall 14 to form a side surface square ring shape.

Further, an upper thin portion 72a is provided on the wall surface (joint portion) of the short side wall 14 which is in contact with the lower hollow rib 72. Further, the thin side wall portion 229a may be provided on the wall surface (joint portion) of the short side wall 14 in contact with the hollow side rib 229. Further, a thin wall portion may be provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the lower hollow rib 228.

For example, as shown in FIG. 8C, the side hollow ribs 76 are omitted, and the upper hollow ribs 73 and the lower hollow ribs 72 extending laterally are provided only on the upper and lower ends of the short side wall 14. Further, the lower thin portion 73a and the upper thin portion 72a are provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the upper hollow rib 73 and the lower hollow rib 72.

For example, as shown in FIG. 8 (d), a central hollow rib 231 as a hollow rib extending in the lateral direction is provided on the outer surface of the short side wall 14 at approximately the center height. Further, a thin portion 231a should be provided on the wall surface (joint portion) of the short side wall 14 that is in contact with the central hollow rib 231.

For example, as shown in FIG. 9A, the lower hollow rib 72 and the upper hollow rib 73 are omitted, and the short side wall 1
Providing a pair of left and right side hollow ribs 76 extending in the up-down direction on both sides of 4. Furthermore, these side hollow ribs 76
The thin side wall portion 76 is formed on the wall surface (joint portion) of the short side wall 14 in contact with
Providing a.

For example, as shown in FIG. 9 (b), the lower hollow ribs 72 and the upper hollow ribs 73 are omitted in their central portions, and hollows formed in a side-reverse L-shape on both sides of the short side wall 14. Providing a pair of left and right inverted L-shaped ribs 232 as ribs. Further, the upper hollow ribs 73 and the side hollow ribs 76
On the wall surface (joint portion) of the short side wall 14 in contact with the lower thin portion 7
3a and the thin side wall portion 76a should be provided. Further, the lower thin portion 73a or the side thin portion 76a may be provided so as to be located in the vicinity of the gas inlet 101, that is, provided only in the upper corner portion of the short side wall 14.

As shown in FIG. 9C, when the space between the adjacent hollow ribs 73, 241 is narrow, the entire wall surface of the short side wall 14 connecting the hollow ribs 73, 241 is formed thin. Therefore, the thin portion 243 may be provided. The width of the thin portion 243, that is, both hollow ribs 73, 24
The interval between 1 may be the same as the width d in the above embodiment.

As shown in FIG. 9C, when the distance between the adjacent hollow ribs 241 and 242 is narrow, a pair of thin wall portions 241 a, 221 a are formed on the wall surface of the short side wall 14 which is in contact with each hollow rib 241 and 242. 242a may be provided.

For example, as shown in FIG. 9D, the wall surface of the short side wall 14 is configured to hang down from the central portion of the lower end surface of the upper hollow rib 73, and the wall surface of the short side wall 14 in contact with the upper hollow rib 73. Providing a pair of outer thin portion 246 and inner thin portion 247 on the outer and inner portions of the (joint portion).

For example, as shown in FIG. 9D, in the hollow rib 248 provided at the height of the central portion of the short side wall 14, the wall surface of the short side wall 14 is joined to the central portion of the upper and lower end surfaces thereof. May be. Furthermore, this hollow rib 248
A pair of outer thin portion 246 and inner thin portion 247 may be provided on the wall surface (joint portion) of the short side wall 14 that contacts with, or only one of the outer thin portion 246 and the inner thin portion 247. May be provided.

Further, the technical idea which can be understood from the above embodiment will be described below. The foldable transport container according to any one of claims 1 to 4, which is made of an olefin-based synthetic resin.

[0080]

As described in detail above, the present invention has the following effects. According to the foldable transport container of the invention described in claims 1 to 4 and the foldable pallet box of the invention described in claim 5, defective molding can be easily prevented and defective molding can be easily performed. It is possible to easily prevent a decrease in strength due to.

[Brief description of drawings]

FIG. 1A is a side view showing a container body of a foldable transport container in which a part of the embodiment is broken, and FIG. 1B is a front sectional view showing a part of the container body.

FIG. 2A is a front view showing a part of a long side wall of the foldable transportation container according to the embodiment, and FIG. 2B is a front sectional view showing the short side wall of the same.

FIG. 3A is a front view showing a part of the container body in an assembled state according to the embodiment, and FIG. 3B is a front view showing a part of the container body in the same folded state.

FIG. 4 is a side cross-sectional view showing the container body during folding according to the embodiment.

FIG. 5 is a partially enlarged side sectional view in which a part of the long side wall of the embodiment is enlarged.

6 (a) to 6 (d) are all side views showing a foldable transport container other than the embodiment.

7A to 7D are all side views showing a foldable transport container other than the embodiment.

8A to 8D are side views each showing a foldable transport container other than the embodiment.

9A and 9B are side views showing a foldable transportation container other than the embodiment, and FIGS. 9C and 9D are front cross-sectional views showing short side walls of the foldable transportation container other than the embodiment. Fig.

[Explanation of symbols]

11 ... Container main body, 12 ... Bottom wall, 13 ... Long side wall as first side wall, 14 ... Short side wall as second side wall, 25 ... Bearing part constituting rotating means, 31 ... Rotating means forming rotating means Moving shaft portion, 31a ... Rotating shaft constituting rotating means, 32 ... Lower hollow rib as hollow rib, 33 ... Upper hollow rib as hollow rib, 35a, 35b, 35c ... Hollow portion, 36 ...
Side hollow ribs as hollow ribs, 45a, 45b, 45
c ... Vertical ribs as reinforcing ribs, 72 ... Lower hollow ribs as hollow ribs, 72a ... Upper thin-walled portion forming side wall joints, 73 ... Upper hollow ribs as hollow ribs, 73a.
Lower thin portion 73b forming a joint portion of side walls ... Upper thin portion 75a, 75b, 75c forming a joint portion of side walls ...
Hollow part, 76 ... Side hollow rib as hollow rib, 76a
... Side thin portion forming side wall joints, 78 ... Holding hole as a hole, 92 ... Upper thin portion forming side wall joints, 93 ... Second upper thin portion forming reinforcing rib joints , 94 ... Lower thin-walled portion forming side wall joints, 95 ...
Side thin portion constituting the joint portion of the side wall, 96, 97 ... Thin portion constituting the joint portion of the side wall, 101 ... Gas injection port, 21
2, 228 ... Lower hollow ribs as hollow ribs, 216
217, 226, 227, 231 ... Central hollow ribs as hollow ribs, 217a ... Central thin portion constituting side wall joints, 221 ... Upper hollow ribs as hollow ribs, 2
21a ... Hollow part, 221b ... Upper thin-walled part forming side wall joint, 221c ... Lower thin-walled part forming side wall joint, 222, 229 ... Side hollow ribs as hollow ribs,
222a, 229a ... Side thin portion 226a, 227a, 231a, 241a, 242 that constitutes the side wall joint
a, 243a ... Thin-walled portion 232 that constitutes the joint portion of the side wall
... Inverted L-shaped ribs as hollow ribs, 241, 242, 2
48 ... Hollow rib, 246 ... Outer thin portion forming a side wall joint, 247 ... Inner thin portion forming a side wall joint.

Continued front page    F-term (reference) 3E006 AA03 BA01 CA01 DA01 DB01                 3E061 AA02 AB09 AD04 AD05 CA02                       DA03 DA04 DA08 DB11 DB17                 3E063 AA06 BA05 BB04 CA04 CB10                       CC01 CD04 FF03 GG10                 3E070 AA33 DA07 KA12 KB06 KC10                       WH10 WJ06

Claims (5)

[Claims] 1. A container main body formed in a rectangular box shape with a bottom from a square plate-shaped bottom wall and a pair of first side walls and second side walls standing upright along the periphery of the bottom wall. , The lower end of each side wall is provided with a turning means for folding the side wall inward of the container main body, and after the first side wall is folded onto the upper surface of the bottom wall, the second side wall is changed to the upper surface of the first side wall It is a foldable transport container in which the container body is configured to be foldable by folding the container body into a hollow rib provided with a hollow portion in the wall surface of the side wall or the bottom wall, and a side wall in contact with the hollow rib. Alternatively, the foldable transport container is characterized in that the joint portion of the bottom wall is formed thin. 2. The wall surface of a side wall or a bottom wall located near a gas injection port or a liquid injection port for forming a hollow portion by injecting a gas or a liquid into a hollow rib at the time of molding is formed thin. The foldable transport container according to claim 1. 3. A container main body formed in a rectangular box shape with a bottom from a rectangular plate-shaped bottom wall and a pair of first side walls and second side walls standing upright along the periphery of the bottom wall. , The lower end of each side wall is provided with a turning means for folding the side wall inward of the container main body, and after the first side wall is folded onto the upper surface of the bottom wall, the second side wall is changed to the upper surface of the first side wall A foldable transport container configured to fold a container body by folding the container into a hollow rib provided with a hollow portion inside the side wall or the bottom wall, and a side wall in contact with the hollow rib. Alternatively, a hole is provided at the joint of the bottom wall, and the hole is located near the gas injection port or liquid injection port for injecting gas or liquid into the hollow rib during molding to form the hollow part. Foldable carrying container characterized by being configured into . 4. A reinforcing rib that is joined to a hollow rib is projected from the wall surface of the side wall or the bottom wall, and a joining portion of the reinforcing rib that is in contact with the hollow rib is formed thin. 4. The collapsible transport container according to claim 3. 5. A bottomed rectangular box-shaped member comprising a rectangular plate-shaped bottom wall member having a fork insertion hole, and a pair of first side walls and second side walls standing upright along the periphery of the bottom wall member. The container main body formed in, the lower end of each side wall is provided with a rotating means for folding each side wall inward of the container main body, and after folding the first side wall to the upper surface of the bottom wall member, A foldable pallet box in which the container body is made foldable by folding the second side wall on the upper surface of the first side wall, and is a wall surface of the side wall, or a wall surface of an upper wall or a lower wall constituting the bottom wall member. A foldable pallet box, characterized in that a hollow rib having a hollow portion inside is provided, and a joint portion of a side wall or a bottom wall member in contact with the hollow rib is formed thin.