# Patent

## Title
Assemblable and disassemblable container

## Abstract

An assemblable and disassemblable container is disclosed wherein a short wall member includes upper corner reinforcing members each formed at a corresponding corner formed by an upper horizontal flange and an endwise vertical side plate portion of the short wall member, and the upper corner reinforcing member includes an inclined coupling rib coupling the vicinity of the end of the upper horizontal flange to the vicinity of the upper end of the endwise vertical side plate portion, and wherein the lower end of the inclined coupling rib is positioned close to an endwise vertical side plate portion side of a lower horizontal rib of a horizontal portion included in a fitting block member. This configuration allows the short wall members and thus the container formed into a box shape to be increased in strength and rigidity, and can be prevented from undergoing torsional deformation.

## Background
FIELD OF THE INVENTION
The present invention relates to an assemblable and disassemblable container (hereinafter simply referred to as “a container”) that can be assembled and then disassembled.
BACKGROUND OF THE INVENTION
An examined Japanese Utility Model Publication (Jikko-Hei) No. 3-26129 discloses a container configured such that in order to increase the height of a container main body that cannot be disassembled, an orifice frame shaped like a rectangular shell is placed on the container main body.
SUMMARY OF THE INVENTION
In the container disclosed in the examined Japanese Utility Model Publication (Jikko-hei) No. 3-26129, the container main body itself cannot be assembled or disassembled.
In the above-described orifice frame, a fitting protruding wall formed on a first support wall is fitted into a fitting recessed portion formed in a second support wall to couple the first and second support walls together. However, disadvantageously, the fitting protruding portion formed on the first support wall is insufficient in strength and may thus be damaged. The fitting protruding portion formed on the first support wall may also be damaged while coupled to the second support wall.
An object of the present invention is to solve the above-described problems with the container main body.
The container comprises one bottom member, a first set of two wall members, and a second set of two wall members and the container is assembled in such a manner that the two wall members of the first set lie opposite each other and that two wall members of the second set lie opposite each other, by fitting fitting blocks formed on an endwise vertical side plate portion of the wall member of the second set into fitting space portions formed in a vertically elongate coupling portion of the wall member of the first set, and furthermore, the first set of wall members and the second set of wall members are each coupled to the bottom member by fitting the fitting block members suspended from back surfaces of lower-end horizontal flanges of the wall member of the first set and the wall member of the second set into respective fitting vertical slots formed in the bottom member, and moreover, the wall member of the second set includes upper corner reinforcing members each formed at a corresponding corner formed by an upper horizontal flange and an endwise vertical side plate portion of the wall member of the second set, and additionally, the upper corner reinforcing member includes an inclined coupling rib coupling the vicinity of the end of the upper horizontal flange to the vicinity of the upper end of the endwise vertical side plate portion, and the lower end of the inclined coupling rib is positioned close to an endwise vertical side plate portion side of a lower horizontal rib of a horizontal portion included in the fitting block member.
Furthermore, a horizontal rib formed on the upper corner reinforcing member is arranged in a substantially collinear manner with respect to an upper horizontal rib of the horizontal portion formed on the corresponding fitting block member.
Moreover, horizontal ribs or corner horizontal reinforcing ribs formed on the wall member of the second set are each arranged in a substantially collinear manner with respect to an upper horizontal rib of the horizontal portion formed on the corresponding fitting block member.
Additionally, a viewing through-slot is formed in a vertical side plate portion of each of the vertically elongate coupling portions of the wall member of the first set so as to overlap the fitting space formed in the vertically elongate coupling portion. An end of each of the horizontal ribs formed on the wall member of the first set is arranged in abutting contact with the vertically elongate coupling portion positioned close to the corresponding viewing through-slot.
The container comprises the one bottom member, the first set of two wall members, and the second set of two wall members, and the container is assembled in such a manner that the two wall members of the first set lie opposite each other and that two wall members of the second set lie opposite each other, by fitting the fitting blocks formed on the endwise vertical side plate portion of the wall member of the second set into the fitting space portions formed in the vertically elongate coupling portion of the wall member of the first set, and furthermore, the first set of wall members and the second set of wall members are each coupled to the bottom member by fitting the fitting block members suspended from back surfaces of lower-end horizontal flanges of the wall member of the first set and the wall member of the second set into the respective fitting vertical slots formed in the bottom member, and moreover, the wall member of the second set includes the upper corner reinforcing members each formed at the corresponding corner formed by the upper horizontal flange and an endwise vertical side plate portion of the wall member of the second set. The upper corner reinforcing member includes the inclined coupling rib coupling the vicinity of the end of the upper horizontal flange to the vicinity of the upper end of the endwise vertical side plate portion. The lower end of the inclined coupling rib is positioned close to the endwise vertical side plate portion side of the lower horizontal rib of the horizontal portion included in the fitting block member. As a result, the second set of wall members and thus the container assembled into a box shape can be increased in strength and rigidity. Furthermore, the container can be prevented from undergoing torsional deformation.
Furthermore, the horizontal rib formed on the upper corner reinforcing member is arranged in a substantially collinear manner with respect to the upper horizontal rib of the horizontal portion formed on the corresponding fitting block member. Thus, the container can be increased in strength and rigidity and be prevented from undergoing torsional deformation. The fitting block members can also be increased in strength and rigidity.
Moreover, the horizontal ribs or corner horizontal reinforcing ribs formed on the wall member of the second set are each arranged in a substantially collinear manner with respect to the upper horizontal rib of the horizontal portion formed on the corresponding fitting block member. As a result, the second set of wall members and thus the container assembled into a box shape can be increased in strength and rigidity. Furthermore, the container can be prevented from undergoing torsional deformation. The fitting block members can also be increased in strength and rigidity.
Moreover, the viewing through-slot is formed in the vertical side plate portion of each of the vertically elongate coupling portions of the wall member of the first set so as to overlap the fitting space formed in the vertically elongate coupling portion, and the end of each of the horizontal ribs formed on the wall member of the first set is arranged in abutting contact with the vertically elongate coupling portion positioned close to the corresponding viewing through-slot. As a result, the vertical coupling portion positioned close to the viewing through-slot and thus the first set of wall members can be increased in strength and rigidity.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing that an assemblable and disassemblable container according to the present invention has been assembled.
FIG. 2 is a perspective view of a bottom member included in the container according to the present invention.
FIG. 3 is a partly enlarged perspective view of the bottom member shown in FIG. 2.
FIG. 4 is a perspective view of a long wall member included in the container.
FIG. 5 is also a perspective view of the long wall member included in the container.
FIG. 6 is a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 7 is also a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 8 is also a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 9 is also a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 10 is also a partly enlarged perspective view of the long wall member shown in FIG. 4, including a partial vertical cross-sectional view thereof.
FIG. 11 is also a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 12 is also a partly enlarged perspective view of the long wall member shown in FIG. 4.
FIG. 13 is also a partly enlarged perspective view of the long wall member shown in FIG. 4, including a partial vertical cross-sectional view thereof.
FIG. 14 is a perspective view of a short wall member included in the container according to the present invention.
FIG. 15 is also a perspective view of the short wall member included in container according to the present invention.
FIG. 16 is a partly enlarged perspective view of the short wall member included in the container according to the present invention.
FIG. 17 is a partly enlarged perspective view of the short wall member included in the container according to the present invention, including a partial vertical cross-sectional view thereof.
FIG. 18 is a vertical partial cross-sectional view of the short wall member included in the container according to the present invention.
FIG. 19 is a perspective view of the long wall member and the short wall member illustrating the order in which the container according to the present invention is assembled.
FIG. 20 is a perspective view of the long wall member and the short wall member illustrating the order in which the container according to the present invention is assembled.
FIG. 21 is also a perspective view of the long wall member and the short wall member illustrating the order in which the container according to the present invention is assembled.
FIG. 22 is also a perspective view of the long wall member and the short wall member illustrating the order in which the container according to the present invention is assembled.
FIG. 23 is also a perspective view of the long wall member and the short wall member illustrating the order in which the container according to the present invention is assembled.
FIG. 24 is a perspective view of a container main body included in the container according to the present invention.
FIG. 25 is a perspective view of the container main body and the bottom member both included in the container according to the present invention.
FIG. 26 is a partly enlarged vertical cross-sectional view showing that the container main body and the bottom member forming the container according to the present invention have been fitted together.
FIG. 27 is a partly enlarged vertical cross-sectional view showing how the container main body and the bottom member forming the container according to the present invention and fitted together are released from each other.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the present invention will be described below. However, the present invention is not limited to this embodiment, and any other embodiment is possible unless such an embodiment departs from the spirits of the present invention.
In FIG. 1, an assemblable and disassemblable container (as mentioned above, hereinafter simply referred to as “a container”) is denoted by C1 and includes a bottom member 1, opposite long wall members 2, and opposite short wall members 3.
Now, the bottom member 1 will be described with reference to FIG. 2 and FIG. 3.
The bottom member 1 includes a bottom plate portion 1a with a substantially rectangular planar shape and a peripheral wall portion 1b erected integrally with the bottom plate portion 1a. The peripheral wall portion 1b includes long side peripheral walls 1b1 erected on opposite long side portions of the bottom plate portion 1a and short side peripheral walls 1b2 erected on opposite short side portions of the bottom plate portion 1a. In the present embodiment, the bottom plate portion 1a includes a flat plate 1a1 forming the bottom plate portion 1a and recessed portions 1a2 each having a square planar shape and formed by recessing the flat plate 1a1 downward.
The peripheral wall portion 1b includes a peripheral upper-end horizontal flange 1c formed at and extended outward from the upper end. Furthermore, the peripheral wall portion 1b includes a peripheral lower-end horizontal flange 1d formed close to a lower end thereof and extended outward. Additionally, four corners 1c1 of the peripheral upper-end horizontal flanges 1c are coupled to respective four corners 1d1 of the peripheral lower-end horizontal flange 1d by respective band plate-like corner vertical ribs 1e. Moreover, linear portions 1c2 of the peripheral upper-end horizontal flange 1c are coupled to respective linear portions 1d2 of the peripheral lower-end horizontal flange 1d by an appropriate number of plate-like vertical ribs 1f. In the present embodiment, each of the vertical ribs 1f is formed of an intermediate band-like portion 1f1, an upper triangular portion 1f2 formed in a corner between an upper end of the intermediate band-like portion 1f1 and a lower surface of the peripheral upper-end horizontal flange 1c, and a lower triangular portion 1f3 formed in a corner between an lower end of the intermediate band-like portion 1f1 and an upper surface of the peripheral lower-end horizontal flange 1d. 
In the present embodiment, the vertical rib 1f is formed by extending one of opposite side plate portions 1g2 forming a fitting member 1g to the peripheral lower-end horizontal flange 1d. Furthermore, the vertical rib 1f is formed by extending one of the opposite side plate portions 1g2 forming the fitting member 1g to an inclined piece 1i2 forming a bottom corner reinforcing portion 1i. Alternatively, the vertical rib 1f may be formed so as to couple the peripheral upper-end horizontal flange 1c and the peripheral lower-end horizontal flange 1d together.
The fitting members 1g are formed on the linear portion 1c2 of the peripheral upper-end horizontal flange 1c at predetermined intervals. The fitting member 1g is formed of a fitting hole 1g1 drilled in the linear portion 1c2 of the peripheral upper-end horizontal flange 1c, opposite side plate portions 1g2 crossing a longitudinal direction of the linear portion 1c2 of the peripheral upper-end horizontal flange 1c at right angles and suspended from a back surface of the linear portion 1c2 of the peripheral upper-end horizontal flange 1c, a horizontal plate portion 1g3 connecting lower ends of the opposite side plate portions 1g2 together, and a partitioning plate portion 1g4 which closes a side opening formed by the side plate portions 1g2 and the horizontal plate portion 1g3 and which is arranged parallel to a flat part of the peripheral wall portion 1b, that is, the entire peripheral wall portion 1b except for four corners 1d1, and at a distance from the peripheral wall portion 1b. Furthermore, a locking through-slot 1g4′ is formed in the partitioning plate portion 1g4.
The fitting member 1g is configured as described above and thus includes a fitting vertical slot H1 formed by the fitting hole 1g1 drilled in the linear portion 1c2 of the peripheral upper-end horizontal flange 1c, the opposite side plate portions 1g2, the horizontal plate portion 1g3, the partitioning plate portion 1g4, and the flat part of the peripheral wall portion 1b parallel to the partitioning plate portion 1g4. In the present embodiment, four fitting vertical slots H1 are formed in each of the opposite linear portions 1c2; a total of 16 fitting vertical slots H1 are formed. Furthermore, each of the linear portions 1c2 of the peripheral upper-end horizontal flange 1c includes sub-fitting vertical slots h1 formed in a central part thereof. In the present embodiment, two sub fitting vertical slots h1 are formed in each of the opposite linear portions 1c2; a total of eight sub fitting vertical slots h1 are formed.
For the band-like corner vertical rib 1e, which couples the corner 1c1 of the peripheral upper-end horizontal flange 1c formed on the bottom member 1 described above to the corner 1d1 of the peripheral lower-end horizontal flange 1d, lower parts of opposite side surfaces of the band-like corner vertical rib 1e connect to horizontal pieces 1i1 which are perpendicular to the band plate-like corner vertical rib 1e and parallel to the peripheral lower-end horizontal flange 1d. A tip of each of the horizontal pieces 1i1 is coupled, by an inclined piece 1i2, to a tip of the peripheral lower-end horizontal flange 1d positioned at the corner 1d1.
As described above, the bottom corner reinforcing portion 1i formed by the horizontal piece 1i1 and the inclined piece 1i2 is formed at each corner of the bottom member 1. Thus, the bottom member 1 can be increased in strength and rigidity and prevented from undergoing torsional deformation. Furthermore, the container C1 assembled into a box shape can further be increased in strength and rigidity, and the bottom member 1 can further be prevented from undergoing torsional deformation. Reinforcing triangular ribs 1j may be formed at each corner formed by the peripheral upper-end horizontal flange 1c and the peripheral wall portion 1b and each corner formed by the peripheral lower-end horizontal flange 1d and the peripheral wall portion 1b. 
Now, the long wall member 2 will be described with reference to FIG. 4 to FIG. 13.
The long wall member 2 includes a flat plate portion 2a, and vertically elongate coupling portions 2b extended from opposite vertical sides of the flat plate portion 2a and substantially perpendicularly to an inner surface (the surface positioned inside the container C1 when the container C1 is assembled into a box shape) 2a1 of the flat plate portion 2a and over the overall height of the opposite vertical sides of the flat plate portion 2a. Furthermore, an upper-end horizontal flange 2c is formed at the upper end of the flat plate portion 2a and the vertically elongate coupling portions 2b so as to extend outward perpendicularly to an outer surface (the surface positioned outside the container C1 when the container C1 is assembled into a box shape) 2a2 of the flat plate portion 2a. Moreover, a lower-end horizontal flange 2d is formed at the lower end of the flat plate portion 2a and the vertically elongate coupling portions 2b so as to extend outward perpendicularly to the outer surface 2a2 of the flat plate portion 2a. 
The vertically elongate coupling portion 2b includes a vertically elongate space portion A1 formed by an upper-end horizontal plate portion 2b1 formed by extending the upper-end horizontal flange 2c, a lower-end horizontal plate portion 2b2 lying opposite the upper-end horizontal plate portion 2b1 and formed by extending the lower-end horizontal flange 2d, opposite vertical side plate portions 2b3, and an inside wall 2b4. The vertically elongate space portion A1 is extended from tips 2b3′ of the opposite vertical side plates 2b3 to the inside wall 2b4. An appropriate number of horizontal partitioning plate portions 2b5 are formed to connect to the opposite vertical side plates 2b3 and the inside wall 2b4. The formation of these horizontal partitioning plate portions 2b5 allows the vertically elongate space portion A1 to be partitioned into a plurality of subs space portion A1′. For convenience of description, the horizontal partitioning plate portion 2b5 lying opposite the upper-end horizontal plate portion 2b1 is referred to as an upper-end horizontal partitioning plate portion and denoted by reference numeral 2b5′. The horizontal partitioning plate portion 2b5 lying opposite the lower-end horizontal plate portion 2b2 is referred to as a lower-end horizontal partitioning plate portion and denoted by reference numeral 2b5′′. In the present embodiment, the vertically elongate space portion A1 is partitioned into five subs space portions A1′.
The upper-end horizontal partitioning plate portion 2b5′ includes a vertical piece 2b6 suspended from a lower surface of a central part thereof and connected to the opposite vertical side plate portions 2b3. The vertical short piece 2b6 includes a horizontal piece 2b7 formed at a lower end thereof and connected to the opposite vertical side plate portions 2b3 and extended to the tips 2b3′ of the opposite vertical side plate portions 2b3. The formation of the vertical piece 2b6 and the horizontal piece 2b7 allows a fitting space A2 opening downward to be formed under the lower-end horizontal partitioning plate portion 2b5′ by the opposite vertical side plate potions 2b3, the inside wall 2b4, the upper-end horizontal partitioning portion 2b5′, and the vertical piece 2b6.
Similarly, the above-described vertical piece 2b6 is suspended from a lower surface of a central part of each of the horizontal partitioning plate portions 2b5 positioned between the upper-end horizontal partitioning plate portion 2b5′ and the lower-end horizontal partitioning plate portion 2b5′′, and the above-described horizontal piece 2b7 is formed at the lower end of the vertical short piece 2b6. The formation of the vertical piece 2b6 and the horizontal piece 2b7 allows a similar fitting space A2 to be formed under the horizontal partitioning plate portion 2b5.
As described above, the vertically elongate coupling portion 2b is formed by the upper-end horizontal plate portion 2b1, the lower-end horizontal plate portion 2b2, the opposite vertical side plate portions 2b3, and the inside wall 2b4. Thus, the vertically elongate coupling portion 2b can be increased in strength and rigidity and prevented from undergoing torsional deformation. Furthermore, the container C1 assembled into a box shape can be increased in strength and rigidity and prevented from undergoing torsional deformation. Additionally, when the opposite vertical side plate portions 2b3 included in the vertically elongate coupling portion 2b are coupled together by the horizontal partitioning plate portions 2b5, the vertical pieces 2b6, and the horizontal pieces 2b7, the vertically elongate coupling portion 2b can further be increased in strength and rigidity and more reliably prevented from undergoing torsional deformation. Furthermore, the container C1 assembled into a box shaped can further be increased in strength and rigidity and more reliably prevented from undergoing torsional deformation. Moreover, one of the opposite vertical side plate portions 2b3 which is positioned outside avoids having a rib structure and thus serves to prevent the vertically elongate coupling portion 2b from being damaged.
Furthermore, a fitting block member B1 is suspended from a back surface of the lower-end horizontal flange 2d of the long wall member 2; the fitting block member B1 is fitted into the corresponding fitting vertical slot H1 in the fitting member 1g formed on the linear portion 1c2 of the peripheral upper-end horizontal flange 1c included in the above-described bottom member 1.
A plurality of the fitting block members B1 are formed on the back surface of the lower-end horizontal flange 2d along the longitudinal direction of the lower-end horizontal flange 2d. A plate-like elastic tongue portion b1 included in the fitting block member B1 is suspended from the back surface of the lower-end horizontal flange 2d along the longitudinal direction of the lower-end horizontal flange 2d. The elastic tongue portion b1 includes a horizontal locking projecting portion bia formed at a lower end thereof and extended toward a tip 2d1 of the lower-end horizontal flange 2d. A lower surface of the locking projecting portion b1a is formed into an inclined surface b1a′ inclined downward from a tip of the locking projecting portion b1a toward the elastic tongue portion b1. Furthermore, the locking projecting portion b1a is configured to be fitted and locked in the corresponding locking though-hole 1g4′ drilled in the partitioning plate portion 1g4 of the fitting member 1g formed in the bottom member 1 when the container C1 is assembled into a box shape. Moreover, the locking projecting portion b1a includes a recessed portion b1a′′ formed in a central part thereof and opening downward and toward the tip 2d1 of the lower-end horizontal flange 2d. Additionally, the elastic tongue piece b1 include vertical thick portions b1b formed on an inner surface (the surface positioned inside the container C1 when the container C1 is assembled) b1′ thereof along respective opposite vertical side portions thereof. Each of the vertical thick portions b1b includes an elastic deformation suppressing projection b1b′ projected from a lower end thereof to suppress elastic deformation of the elastic tongue piece b1. The vertical thick portions b1b may be omitted, and the elastic deformation suppressing projections b1b′ may be projected directly from the inner surface b1′ of the elastic tongue piece b1.
The above-described elastic piece b1 is configured to cross the longitudinal direction of the lower-end horizontal flange 2d at right angles and such that side portions and a lower end thereof are protected by an elastic tongue piece protecting member b2 including opposite vertical side plate portions b2a suspended from the back surface of the lower-end horizontal flange 2d and a lower-end horizontal plate portion b2b coupling lower ends of the vertical side plate portions b2a together. Furthermore, the locking projecting portion b1a formed at the lower end of the above-described elastic tongue piece b1 is configured to project outward beyond the elastic tongue piece protecting member b2.
Furthermore, viewing through-slots 2b8 each formed so as to overlap the fitting space A2 are drilled in one of the opposite vertical side plate portions 2b3 forming the vertically elongate coupling portion 2b which is positioned outside (the side positioned outside the container C1 when the container C1 is assembled into a box shape).
Drain through-slots 2e are drilled in one of the opposite vertical side plate portions 2b3 forming the vertically elongate coupling portion 2b which is positioned outside (the side positioned outside the container C1 when the container C1 is assembled into a box shape). An appropriate number of vertical ribs 2f are formed on the outer surface 2a2 of the long wall member 2. An appropriate number of horizontal ribs 2g are formed on the outer surface 2a2 of the long wall member 2.
For portions (hereinafter referred to as high portions and denoted by reference numeral 2g1) of the horizontal ribs 2g which are positioned between each of the vertically elongate coupling portions 2b and the corresponding one of the vertical ribs (hereinafter referred to as opposite-end vertical ribs and denoted by reference numeral 2f′) positioned at the widthwise opposite ends of the log wall member 2, the height (from the outer surface 2a2 of the flat plate portion 2a to a tip of each of the horizontal ribs 2g) is set substantially the same as the that of the opposite-end vertical ribs 2f′ (the height from the outer surface 2a2 of the flat plate portion 2a to a tip of each of the opposite-end vertical ribs 2f′). This configuration enables the vertically elongate coupling portions 2b to be increased in strength and rigidity.
Furthermore, the height of portions 2g2 of the horizontal ribs 2g positioned between each of the opposite-end vertical ribs 2f′ and the vertical rib 2f lying opposite the opposite-end vertical rib 2f′ and between the opposite vertical ribs 2f is set smaller than that of the high portions 2g1 (the height from the outer surface 2a2 of the flat plate portion 2a to the tip of each of the horizontal ribs 2g). Each of the portions 2g2 of the horizontal ribs 2g formed to be lower than the high portion 2g1 is coupled, by a triangular portion 2g3, to the opposite-end vertical rib 2f′ and the vertical rib 2f. This configuration enables the long wall member 2 to be increased in strength and rigidity and to be reduced in weight.
Furthermore, as described above, one of the vertical side plate portions 2b3 forming the vertically elongate coupling portion 2b which is positioned outside includes the viewing through-slots 2b8 drilled therein and each overlapping the fitting space A2 at an upper part of the viewing through-slot 2b8. Each of the high portions 2g1 of the horizontal rib 2g is arranged in abutting contact with a part of the vertically elongate coupling portion 2b which is positioned close to the corresponding viewing through-slot 2b8. This configuration allows the parts of the vertically elongate coupling portion 2b positioned close to the respective viewing through-slots 2b8 and thus the long wall member 2 to be increased in strength and rigidity.
Moreover, the sub fitting block members B1′ fitted into the respective sub fitting vertical slots h1 formed in the peripheral upper-end horizontal flange 1c of the above-described bottom member 1 are suspended from the back surface of the lower-end horizontal flange 2d. When the sub fitting block members B1′ fitted into the respective sub fitting vertical slots h1 formed in the peripheral upper-end horizontal flange 1c of the above-described bottom member 1 are thus suspended from the back surface of the lower-end horizontal flange 2d, the long wall member 2 can be prevented from being tiled when erected. Triangular reinforcing ribs 2h may be formed in corners formed by the outer surface 2a2 of the flat plate portion 2a and the lower-end horizontal flange 2d. 
Moreover, an outer tip of each upper horizontal flange 2i formed under and close to the upper-end horizontal flange 2c of the long wall member 2 is coupled to an outer tip of the upper-end horizontal flange 2c by a vertical coupling band-like plate 2j lying parallel to the flat plate portion 2a. Thus, the long wall member 2 includes an upper reinforcing portion 2′ located in an upper part thereof and formed of the upper-end horizontal flange 2c, the upper horizontal flange 2i, and the vertical coupling band-like plate 2j coupling the outer tip of the upper-end horizontal flange 2c to the outer tip of the upper horizontal flange 2i, the upper reinforcing portion 2′ having a generally C-shaped cross section (a vertical cross section perpendicular to the longitudinal direction of the upper-end horizontal flange 2c of the long wall member 2). As a result, the long wall member 2 can be increased in strength and rigidity and prevented from undergoing torsional deformation. Furthermore, the container C1 formed into a box shape can be increased in strength and rigidity and prevented from undergoing torsional deformation. Vertical reinforcing coupling ribs coupling the upper-end horizontal flange 2c to the upper horizontal flange 2i are denoted by 2k. 
Now, the short wall member 3 will be described with reference to FIG. 14 to FIG. 18.
The short wall member 3 includes a flat plate portion 3a, an upper-end horizontal flange 3b extended outward from an upper end of the flat plate portion 3a and perpendicularly to an outer surface (the surface positioned outside the container C1 when the container C1 is assembled into a box shape) 3a1, and a lower-end horizontal flange 3c extended outward perpendicularly to the outer surface 3a1. The short wall member 3 further includes opposite endwise vertical side plate portions 3d coupling an end of the upper-end horizontal flange 3b to the lower-end horizontal flange 3c. 
Fitting block members 3e are formed on the opposite endwise vertical side plate portions 3d and each include a horizontal portion 3e1 perpendicular to the endwise vertical side plate portion 3d and a vertical portion 3e2 extended upward from and perpendicularly to a tip of the horizontal portion 3e1. The fitting block members 3e are the same, in number, as the fitting spaces A2 formed in the vertically elongate coupling portion 2b of the long wall member 2. In the present embodiment, as described above, five fitting spaces A2 are formed in the vertically elongate coupling portion 2b of the long wall member 2, and thus five fitting block members 3e are formed. When the long wall member 2 and the short wall member 3 are coupled together, the vertical portion 3e2 of each of the fitting block member 3e is fitted into the corresponding fitting space A2. Furthermore, the short wall member 3 includes fitting blocks B1 suspended from a back surface of the lower-end horizontal flange 3c and which are similar to the fitting blocks B1 suspended from the back surface of the lower-end horizontal flange 2d of the above-described long wall member 2.
Handheld through-slots 3f are drilled in an upper part of the flat plate portion 3a of the short wall member 3. An appropriate number of vertical ribs are denoted by 3g and formed on the outer surface 3a1 of the short wall member 3. An appropriate number of horizontal ribs 3h are formed on the outer surface 3a1 of the short wall member 3. Furthermore, the height of each of the horizontal ribs 3h (the height from the outer surface 3a1 of the flat plate portion 3a to a tip of the horizontal rib 3h) is mostly set lower than that of each of the vertical ribs 3g. Portions of the horizontal ribs 3h positioned between each of the endwise vertical side plate portions 3d and the vertical rib 3g lying opposite the endwise vertical side plate portion 3d and between the opposite vertical ribs 3g are coupled to the endwise vertical side plate portion 3d and the vertical rib 3g via triangular portions 3h1 each with a generally triangular planar shape. This configuration enables the short wall member 3 to be increased in strength and rigidity and to be reduced in weight.
Furthermore, the short wall member 3 includes upper horizontal flanges 3i formed under and close to the upper-end horizontal flange 3b. An outer tip of each of the upper horizontal flanges 3i is coupled to the upper horizontal flange 3i by a vertical coupling band-like plate 3j lying parallel to the flat plate portion 3a. Thus, the short wall member 3 includes an upper reinforcing portion 3′ located in an upper part thereof and formed of the upper-end horizontal flange 3b, the upper horizontal flange 3i, and the vertical coupling band-like plate 3j, the upper reinforcing portion 2′ having a generally C-shaped cross section (a vertical cross section perpendicular to the longitudinal direction of the upper horizontal flange 3b of the short wall member 3). The formation of the above-described upper reinforcing portion 3′ enables the short wall member 3 to be increased in strength and rigidity and prevented from undergoing torsional deformation. Furthermore, the container C1 formed into a box shape can be increased in strength and rigidity and prevented from undergoing torsional deformation. An inner surface (the surface positioned inside the container when the container C1 is assembled) of the flat plate portion 3a is denoted by 3a2.
Moreover, upper corner reinforcing members E1 are each formed in a corner formed by the upper horizontal flange 3i and the endwise vertical side plate portion 3d. The upper corner reinforcing member E1 includes an inclined coupling rib e1 formed thereon to couple the vicinity of an end of the upper horizontal flange 3i to the vicinity of an upper end of the endwise vertical side plate portion 3d. A lower end of the inclined coupling rib e1 is positioned close to that part of a lower horizontal rib 3e1′ of the horizontal portion 3e1 included in the fitting block member 3e which part is closer to the endwise vertical side plate portion 3d. The above-described formation of the upper corner reinforcing member E1 enables the short wall member 3 and thus the container C1 formed into a box shape to be increased in strength and rigidity. Additionally, the container C1 can be prevented from undergoing torsional deformation.
The inclined coupling rib e1 included in the upper corner reinforcing member E1 includes a horizontal rib e2 formed in the middle thereof and connected, via the endwise vertical side plate portion 3d, to the upper horizontal rib 3e1′′ of the horizontal portion 3e1 included in the fitting block member 3e. Furthermore, the upper corner reinforcing member E1 includes a vertical rib e3 formed therein and connected via the upper horizontal flange 3i to a vertical reinforcing coupling rib 3k coupling the upper-end horizontal flange 3b to the upper horizontal flange 3i. Moreover, the upper corner reinforcing member E1 includes a triangular corner outer-wall plate portion e4 formed parallel to the flat plate portion 3a and flush with the vertical coupling band-like plate 3j. 
As described above, the upper corner reinforcing member E1 is formed in the corner formed by the upper horizontal flange 3i and the endwise vertical side plate portion 3d. Thus, the short wall member 3 and thus the container C1 assembled into a box shape can be increased in strength and rigidity. Moreover, the container C1 can be prevented from undergoing torsional deformation.
Furthermore, as described above, the upper corner reinforcing member E1 includes the inclined coupling rib e1 coupling the vicinity of the end of the upper horizontal flange 3i to the vicinity of the upper end of the endwise vertical side plate portion 3d. Thus, the short wall member 3 and thus the container C1 assembled into a box shape can be increased in strength and rigidity. Moreover, the container C1 can be prevented from undergoing torsional deformation.
Moreover, the horizontal rib e2 forming the upper corner reinforcing member E1 is arranged in a substantially collinear manner with respect to the upper horizontal rib 3e1′′ of the horizontal portion included in the fitting block member 3e. Thus, the container C1 formed into a box shape can be increased in strength and rigidity and prevented from undergoing torsional deformation.
Furthermore, the horizontal rib e2 forming the upper corner reinforcing member E1 is arranged in a substantially collinear manner with respect to the upper horizontal rib 3e1′′ of the horizontal portion included in the fitting block member 3e. Thus, the fitting block members 3e formed on the short wall member 3 can be increased in strength and rigidity.
The appropriate number of horizontal ribs 3h formed on the outer wall surface 3a1 of the short wall member 3 is arranged in a substantially collinear manner with respect to the upper horizontal rib 3e1′′ of the horizontal portion 3e1 included in the fitting block member 3e. This configuration enables the short wall member 3 and thus the container C1 assembled into a box shape to be increased in strength and rigidity. Moreover, the container C1 can be prevented from undergoing torsional deformation. Furthermore, the fitting block members 3e formed on the short wall member 3 can be increased in strength and rigidity.
If the appropriate number of horizontal ribs 3h formed on the outer wall surface 3a1 of the short wall member 3 are not provided at the positions of the upper horizontal ribs 3e1′′ of the horizontal portions 3e1 included in the fitting block members 3e, corner horizontal reinforcing ribs 3m are each formed in a corner formed by the endwise vertical side plate portion 3d and the outer surface 3a1 of the flat plate portion 3a. Each of the corner horizontal reinforcing ribs 3m is arranged in a substantially collinear manner with respect to the upper the upper horizontal rib 3e1′′ of the horizontal portion 3e1 included in the corresponding fitting block member 3e. This configuration enables the short wall member 3 and thus the container C1 assembled into a box shape to be increased in strength and rigidity. Moreover, the container C1 can be prevented from undergoing torsional deformation. Furthermore, the fitting block members 3e formed on the short wall member 3 can be increased in strength and rigidity.
Furthermore, the lower-end horizontal flange 3c includes the sub fitting block members B1′ suspended from the back surface thereof and fitted into the sub fitting vertical slots h1 formed in the peripheral upper end horizontal flange 1c of the above-described bottom member 1. Thus, since the lower-end horizontal flange 3c includes the sub fitting block members B1′ suspended from the back surface thereof and fitted into the sub fitting vertical slots h1 formed in the peripheral upper end horizontal 1c of the above-described bottom member 1, the short wall member 3 can be prevented from being tilted when erected. Triangular reinforcing ribs 3n may be formed in a corner formed by the outer surface 3a1 of the flat plate portion 3a and the lower-end horizontal flange 3c. 
Now, assembly of the container C1 will be described with reference to FIG. 19 to FIG. 26.
First, the coupling between the long wall member 2 and the short wall member 3 will be described.
As shown in FIG. 19, the long wall member 2 and the short wall member 3 are arranged so that the flat plate portion 2a of the long wall member 2 and the flat plate portion 3a of the short wall member 2 cross at right angles as shown in FIG. 19 and so that the sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall member 2 lie opposite the respective fitting block members 3e formed on the endwise vertical side plate portions 3d of the short wall member 3 as shown in FIG. 20.
Then, the short wall member 3 is moved closer to the long wall member 2, and fitting block members 3e formed on the endwise vertical side plate portions 3d of the short wall member 3 are inserted into the respective sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall member 2. Furthermore, as shown in FIG. 21, the endwise vertical side plate portion 3d of the short wall member 3 is brought into abutting contact with the tip 2b3′ of the opposite vertical side plate portion 2b3 included in the vertically elongate coupling portion 2b of the long wall member 2. When the endwise vertical side plate portion 3d of the short wall member 3 thus comes into abutting contact with the tip 2b3′ of the opposite vertical side plate portion 2b3 included in the vertically elongate coupling portion 2b of the long wall member 2, the vertical portions 3e2 of the fitting block members 3e formed in the short wall member 3 are positioned under the respective fitting spaces A2 positioned in the sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall portion 2. Hence, whether or not the vertical portions 3e2 of the fitting block members 3e formed in the short wall member 3 are positioned under the respective fitting spaces A2 formed in the vertically elongate coupling portion 2b of the long wall portion 2 can be checked through the viewing through-slots 2b8 depending on whether or not the vertical portions 3e2 of the fitting block members 3e are positioned in the respective viewing through-slots 2b8 drilled in one of the opposite vertical side plate portions 2b3 forming the vertically elongate coupling portion 2b which is positioned outside, as shown in FIG. 22.
Then, the short wall member 3 is raised with respect to the long wall member 2 or the long wall member 2 is lowered with respect to the short wall member 3 to fit the vertical portions 3e2 of the fitting block members 3e formed on the short wall member 3 into the respective sub spaces A2 positioned in the sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall member 2 as shown in FIG. 23. When the vertical portions 3e2 of the fitting block members 3e are thus fitted into the respective fitting spaces A2, the upper surfaces of the horizontal portions 3e1 of the fitting block members 3e come into abutting contact with the respective lower surfaces of the horizontal pieces 2b7 positioned under the horizontal partitioning plate portions 2b5 and 2b5′, and the upper surface of the upper-end horizontal flange 2c of the long wall member 2 is set flush with the upper surface of the upper-end horizontal flange 3b of the short wall member 3. In this manner, the long wall member 2 and the short wall member 3 are coupled together. Alternatively, the upper surface of the upper-end horizontal flange 2c of the long wall member 2 may be positioned slightly above the upper surface of the upper-end horizontal flange 3b of the short wall member 3.
As described above, when the long wall member 2 and the short wall member 3 are coupled together as described above, the vertical portions 3e2 of the fitting block members 3e2 formed on the short wall member 3 are fitted into the respective fitting spaces A2 positioned in the sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall member 2. Thus, if a load acting in a direction in which the long wall member 2 and the short wall member 3 are separated from each other is placed on the long wall member 2 and the short wall member 3, the vertical portions 3e2 of the fitting block members 3e come into abutting contact with the vertical pieces 2b6 forming the fitting spaces A2. Consequently, the long wall member 2 and the short wall member 3 can be prevented from being separated from each other.
As described above, when the long wall member 2 and the short wall member 3 are coupled together, the upper horizontal ribs 3e1′′ of the horizontal portions 3e1 of the fitting block members 3e formed on the short wall member 3 are arranged in a substantially collinear manner with respect to the respective high portions 2g1 of the horizontal ribs 2g formed on the long wall member 2. This configuration allows an increase in the strength and rigidity of the container main body C1′ obtained by assembling the pair of opposite long wall members 2 and the pair of opposite short wall members 3 together and thus in the strength and rigidity of the container main body C1′ and the container C1.
The container main body C1′ obtained by assembling the pair of opposite long wall members 2 and the pair of opposite short wall members 3 together is placed above the bottom member 1 as shown in FIG. 25. Thereafter, the container main body C1′ is moved closer to the bottom member 1, and the fitting blocks formed on the long wall member 2 and the fitting blocks B1 formed on the short wall members 3 are inserted into the fitting vertical slots H1 in the fitting members 1g formed on the bottom member 1. During the process of inserting the fitting blocks B1 into the fitting vertical slots H1, the inclined surface b1a′ of the locking projecting portion b1a formed on the elastic tongue piece b1 protected by the elastic tongue piece protecting member b2 included in each of the fitting blocks B1 come into abutting contact with the corresponding one of the opposite sides 1g1′ forming the fitting hole 1g1 in the fitting member 1g and extending along the longitudinal direction of the peripheral upper-end horizontal flange 1c which side 1g1′ is positioned closer to the tip of the peripheral upper-end horizontal flange 1c. The free end of the elastic tongue piece b1 is elastically deformed toward the peripheral wall portion 1b, and the fitting blocks B1 formed on the long wall members 2 and the short wall members 3 are fitted into the respective fitting vertical slots H1 in the fitting members 1g formed on the bottom member 1. Once the locking projecting portion b1a formed on the elastic tongue piece b1 aligns with the corresponding locking through-slot 1g4′ drilled in the partitioning plate portion 1g4 included in each of the fitting members 1g formed on the bottom member 1, the elastically deformed elastic tongue piece b1 recovers its original vertical state, and as shown in FIG. 26, the locking projecting portion b1a is inserted into the corresponding locking through-slot 1g4′ drilled in the partitioning plate portion 1g4. Thus, the bottom member 1 is coupled to the long wall members 2 and the short wall members 3, and the container C1 according to the present invention is assembled.
Furthermore, when the sub fitting block members B1′ as described above are suspended from the back surface of the lower-end horizontal flange 2d of the long wall member 2 and/or the back surface of the lower-end horizontal flange 3c of the short wall member 3, the sub fitting block members B1′ are fitted into the respective sub fitting vertical slots h1 formed in the peripheral upper-end horizontal flange 1c of the bottom member 1.
As described above, the long wall member 2 includes the vertically elongate coupling portions 2b formed to extend from the opposite vertical sides of the flat plate portion 2a substantially perpendicularly to the inner surface 2a1 of the flat plate portion 2a. Thus, the long wall members 2 and the container C1 formed into a box shape can be increased in strength and rigidity. Therefore, the container C1 assembled into a box shape can be prevented from undergoing torsional deformation.
Furthermore, as described above, during the operation of coupling the bottom member 1 to the long wall members 2 and the short wall members 3, the fitting blocks B1 formed on each of the long wall members 2 and the fitting blocks B1 formed on each of the short wall members 3 are inserted into the respective fitting vertical slots H1 in the fitting members 1g formed on the bottom member 1. In this case, since the elastic tongue piece b1 included in each of the fitting blocks B1 is protected by the corresponding elastic tongue piece protecting member b2 at the lower end thereof, the elastic tongue piece b1 is prevented from coming into direct abutting contact with the peripheral upper-end horizontal flange 1c of the bottom member 1. Therefore, during the operation of coupling the bottom member 1 to the long wall members 2 and the short wall members 3, the elastic tongue pieces b1 can be prevented from being damaged.
The container C1 assembled into a box shape is disassembled as follows. First, a bar member S is inserted into the recessed portion b1a′′ formed in the locking projecting portion b1a of the elastic tongue piece b1 included in each of the fitting block members B1 formed on the long wall members 2 and the short wall members 3. Thus, as shown in FIG. 27, the free end of the elastic tongue piece b1 is elastically deformed toward the peripheral wall portion 1b of the bottom member 1 to discharge the locking projecting portion b1a formed on the elastic tongue piece b1 from the corresponding locking through-slot 1g4′ drilled in the partitioning plate portion 1g4 included in each of the fitting members 1g formed on the bottom member 1. Thereafter, the container main body C1′ is raised to decouple the container main body C1′ from the bottom member 1. To achieve the operation of decoupling the container main body C1′ from the bottom member 1, the free end of the elastic tongue piece b1 is elastically deformed toward the peripheral wall portion 1b of the bottom member 1. However, the elastic tongue piece b1 is prevented from being excessively elastically deformed and damaged because the elastic deformation suppressing projection b1b′ is projected from the elastic tongue piece b1 as described above and brought into abutting contact with the peripheral wall portion 1b of the bottom member 1 as shown in FIG. 27.
The disassembling operation for the long wall members 2 and the short wall members 3 forming the container main body C1′ can be achieved by reversing the steps of the assembling operation for the long wall members 2 and the short wall members 3. That is, the short wall member 3 is lowered with respect to the long wall member 2 or the long wall member 2 is raised with respect to the short wall member 3 to discharge the vertical portions 3e2 of the fitting block members 3e formed on the short wall member 3 from the respective fitting spaces A2 positioned in the sub space portions A1′ formed in the vertically elongate coupling portion 2b of the long wall member 2. Thereafter, the fitting block members 3e of the short wall member 2 are pulled out from the respective sub space portions A1′ of the long wall member 2. As a result, the long wall member 2 and the short wall member 3 can be disassembled from each other. In this manner, the container C1 is disassembled into five members, that is, the one bottom member 1, the two long wall members 2, and the two short wall members 3.
The embodiment has been described as follows. The container C1 includes five members, that is, the one bottom member 1, the two long wall members 2, and the two short wall members 3. First, the two long wall members and the two short wall members 3 are assembled to form the cylindrical container main body C1′. Thereafter, the cylindrical container main body C1′ is coupled to the bottom member 1 to obtain the container C1 assembled into a box shape. Furthermore, the cylindrical container main body C1′ is pulled out from the bottom member 1 of the container C1 assembled into a box shape. Then, the long wall members 2 are disengaged from the short wall members 3. As a result, the container C1 can be disassembled into five members, that is, the one bottom member 1, the two long wall members 2, and the two short wall members 3. Therefore, the container C1 can be assembled and disassembled quickly and easily.
Furthermore, the container C1 includes five members, that is, the one bottom member 1, the two long wall members 2, and the two short wall members 3. Thus, a space required to store the disassembled members 1, 2, and 3 can be significantly reduced compared to a space required to store the container C1.
Additionally, to change the long wall members 2-side width of the container C1 by increasing or reducing the width of each of the long wall members 2 of the container C1, the width of the long wall member 2 and the width of each of the long-side peripheral walls 1b1 of the peripheral wall portion 1b included in the bottom member 1 may be simply changed. The short wall members 3 need not be changed.
Furthermore, as shown in FIG. 14 to FIG. 17, at a corner formed by each of the endwise vertical side plate portions 3d of the short wall member 3 and the upper horizontal rib 3e1′′ of the horizontal portion 3e1 of the fitting block member 3e, a vertical fitting protrusion 3p is formed which extends from the upper horizontal rib 3e1′′ to the vicinity of the upper horizontal flange 3i. 
On the other hand, a recessed portion 2m into which the above-described vertical fitting protrusion 3p can be fitted is formed in the horizontal piece 2b7 formed on the vertically elongate coupling portion 2b of the long wall member 2 and extending to the upper-end horizontal partitioning plate portion 2b5′ lying opposite the upper-end horizontal plate portion 2b1 and to the tip 2b3′ of the opposite vertical side plate portion 2b3. Thus, when the container C1 is assembled into a box shape, the fitting protrusions 3p formed on the short wall member 3 are fitted into the respective recessed portions 2m formed in the vertically elongate coupling portion 2b of the long wall member 2. Then, the short wall member 3 can be more reliably restrained from moving in the vertical direction with respect to the flat plate portion 2a of the long wall member 2. Furthermore, the long wall members 2 and short wall members 3 of the container C1 assembled into a box shape can be more reliably prevented from undergoing torsional deformation.
As described above, the upper corner reinforcing member E1 is formed at the corner formed by the upper horizontal flange 3i and endwise vertical side plate portion 3d of the short wall member 3; the upper corner reinforcing member E1 includes the inclined coupling rib e1 coupling the vicinity of the end of the upper horizontal flange 3i to the vicinity of the upper end of the endwise vertical side plate portion 3d, the horizontal rib e2 formed in the middle of the inclined coupling rib e1 to couple the inclined coupling rib e1 to the endwise vertical side plate portion 3d of the short wall member 3, the vertical rib e3 connected to the vertical reinforcing coupling rib 3k coupling the upper-end horizontal flange 3b and upper horizontal flange 3i of the short wall member 3 together, and the corner outer-wall plate portion e4. Thus, the short wall members 3 and the container C1 formed into a box shape can be increased in strength and rigidity. Furthermore, the container C1 can be prevented from undergoing torsional deformation.
Additionally, the horizontal rib e2 of the upper corner reinforcing member E1 is arranged in a substantially collinear manner with respect to the upper horizontal rib 3e1′′ of the horizontal portion 3e1 included in the fitting block member 3e. Thus, the upper corner reinforcing member E1 can further be reinforced, and the container C1 formed into a box shape can be increased in strength and rigidity. Furthermore, the container C1 can be prevented from undergoing torsional deformation. The fitting block members 3e can also be increased in strength and rigidity.
Moreover, the vertical rib e3 is connected via the upper horizontal flange 3i to the vertical reinforcing coupling rib 3k coupling the upper horizontal flange 3b to the upper horizontal flange 3i. This configuration allows the short wall members 3 and the container C1 formed into a box shape to be increased in strength and rigidity. Furthermore, the container C1 can be prevented from undergoing torsional deformation.
Moreover, the horizontal rib 3h is arranged in a substantially collinear manner with respect to the upper horizontal rib 3e1′′ of the horizontal portion 3e1 included in the fitting block member 3e. This configuration allows the short wall members 3 and the container C1 formed into a box shape to be increased in strength and rigidity. Furthermore, the container C1 can be prevented from undergoing torsional deformation. The fitting block members 3e formed on the short wall member 3 can also be increased in strength and rigidity.
Moreover, when the long wall member 2 and the short wall member 3 are coupled together, the upper horizontal rib 3e1′′ of the horizontal portion 3e1 of each of the fitting block members 3e formed on the short wall member 3 is arranged in a substantially collinear manner with respect to the high portion 2g1 of the corresponding one of the horizontal ribs 2g formed on the long wall member 2. This configuration enables an increase in the strength and rigidity of the container main body C1′ obtained by assembling the pair of opposite long wall members 2 and the pair of opposite short wall members 3 together. Furthermore, the container main body C1′ and the container C1 can be increased in strength and rigidity.

## Claims

1. An assemblable and disassemblable container, comprising:
one bottom member including fitting vertical slots formed therein,
a set of two first wall members, each of said first wall members including fitting space portions formed in vertically elongate coupling portions and including fitting block members suspended from a back surface of a lower-end horizontal flange,
a set of two second wall members, each of said second wall members including fitting blocks formed on endwise vertical side plate portions and including fitting block members suspended from a back surface of a lower-end horizontal flange,
wherein the container is assemblable such that the two first wall members lie opposite each other and such that the two second wall members lie opposite each other, by fitting said fitting blocks of the second wall members into said respective fitting space portions of the first wall members,
wherein the container is assemblable such that the first wall members and the second wall members are each coupled to the bottom member by fitting said fitting block members of the first wall members and fitting said block members of the second wall members into said respective fitting vertical slots of the bottom member,
wherein each of the second wall members include upper corner reinforcing members formed at corresponding corners formed by an upper horizontal flange and the endwise vertical side plate portions of the second wall members,
wherein the upper corner reinforcing members each include an inclined coupling rib coupling the vicinity of an end of the upper horizontal flange to the vicinity of the upper end of a corresponding one of the endwise vertical side plate portions, an uppermost end of the inclined coupling rib being coupled to the upper horizontal flange and a lowermost end of the inclined coupling rib being coupled to the endwise vertical plate portion,
wherein the lower end of the inclined coupling rib is positioned close to an endwise vertical side plate portion side of a lower horizontal rib of a horizontal portion included in the fitting block member, and
wherein each of said fitting blocks suspended from the back surface of the first wall members and the second wall members comprises an elastic tongue piece projecting from the lower-end horizontal flange, and an elastic tongue piece protecting member projecting from the lower-end horizontal flange, the elastic tongue piece being spaced from said elastic tongue piece and surrounding side surfaces and a lower surface of said elastic tongue piece.

2. The assemblable and disassemblable container according to claim 1,
wherein said fitting block members of said second wall members include vertical portions, and
wherein when the first wall members and the second wall members are coupled together, said vertical portions of the second wall members are fitted into the respective fitting spaces of the first wall members.

3. The assemblable and disassemblable container according to claim 1,
wherein the lower-end horizontal flange of the first wall members and the lower-end horizontal flange of the second wall members comprise the fitting blocks suspended from the back surface thereof,
wherein said bottom member includes fitting members, each of said fitting members having a vertical slot and a locking through member, and
wherein when the first wall members and the second wall members are coupled to the bottom member, the locking projecting portions of said fitting blocks of the first wall members and said second wall members are fitted and locked in corresponding locking through-slots of said fitting members formed on the bottom member.

4. The assemblable and disassemblable container according to claim 1,
wherein the elastic tongue piece includes a locking projection portion projecting in a first direction from the elastic tongue piece, and an elastic deformation suppression portion projecting in a second direction from the elastic tongue piece, opposite the first direction.

5. The assemblable and disassemblable container according to claim 4,
wherein the locking projection portion protrudes beyond the elastic tongue piece protecting member, in the first direction, and
wherein the elastic deformation suppression portion does not protrude beyond the elastic tongue piece protecting member, in the second direction.