JP2602762B2 - Side wall that can be assembled and disassembled in an assembly building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side wall which can be assembled and disassembled in an assembled building such as an assembled unit house.

[0002]

2. Description of the Related Art Conventionally, a unit house, for example, employs a system in which a required number of house constituent panels are assembled in a box shape at a factory, transported to the site, and installed.

[0003]

According to such a conventional system, there is an advantage that the installation work of the unit house on site is very small, but since the unit house is large in volume, the transportation during transportation is required. There is a problem that the efficiency is very poor, and because it requires a large space for storage,
There was also a problem with land utilization in factories and the like.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, to assemble and disassemble easily, to be able to collect the disassembled products compactly, and to greatly improve the transportation efficiency during transportation. It requires less storage space, can make use of land in factories, etc., can also achieve weight reduction, and is also excellent in aesthetics.
An object of the present invention is to provide a side wall that can be disassembled and disassembled in an assembled building.

[0005]

In order to achieve the above object, the present invention provides a front and rear side wall panel, a left and right side wall panel composed of a pair of front and rear divided panels, and a connecting member for connecting the same side divided panels. The first and second hinge components are respectively provided on the vertical frame members on the left and right side edges of the front and rear side wall panels, and the first and second hinge components are provided on the vertical frame members on the front and rear side edges of the divided panels on the left and right side wall panels. Third and fourth hinge components are provided, and fifth and sixth hinge components are provided on both front and rear edges of each connecting member, and first and second hinge components of the vertical frame member of the front and rear side wall panels. And the third hinge constituting portion of the vertical frame member of the divided panels on both outer sides of the left and right side wall panels are combined with each other, so that the divided panels of the left and right side wall panels are approximately 90 with respect to the front and rear side wall panels.
° While being connected swingably, the fourth hinge component of the divided panel of the left and right side wall panels is combined with the fifth and sixth hinge components on both sides of the connecting member arranged in the middle of these, and The divided panels are foldably connected to each other via a connecting member, and when the divided panels on the same side are folded, the third hinge component of the divided panel is connected to the first and second hinge components of the front and rear side wall panels. The gist is a removable side wall that can be assembled and disassembled in an assembled building.

[0006]

[Function] To assemble the side wall in the above-mentioned assembled building,
First, the front and rear side wall panels are overlapped, and the left and right side wall panels divided by the connecting members are respectively arranged on the left and right side panels of the front and rear side wall panels. After attaching the components to the first and second hinge components of the front and rear side wall panels, the front and rear side wall panels may be pulled to both front and rear outer sides.

As a result, the front and rear divided panels of the left and right side panels are opened via the connecting member, and a substantially rectangular side wall is assembled as viewed from the plane formed by the front and rear side panels and the left and right side panels.

Conversely, in order to disassemble the side wall of the assembled building, the front and rear side wall panels of the substantially rectangular side wall as viewed from the plane are pushed inward, and the left and right side wall panel is divided by approximately 90 ° with respect to the front and rear side wall panels. Swing, and at the same time, the divided panels on the same side are folded into two via a connecting member.
Then, in the folded state of the split panel, the third hinge component of the split panel may be removed from the first and second hinge components of the front and rear side wall panels.

As described above, the side wall of the assembled building can be freely assembled and disassembled.

[0010] The disassembled panels can be stacked and compacted together, so that the transportation efficiency during transportation can be greatly increased and the storage space can be reduced.

[0011] Further, the assembling of the side wall is performed, for example, by the hinge components of a vertical frame member made of an extruded aluminum member of each panel.
Alternatively, since the hinge component and the connecting member made of the extruded aluminum material are simply fitted together, even an unskilled person can work, and the assembling work is not troublesome and the assembling accuracy can be reliably achieved. it can.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, front and rear, left and right, and up and down are based on FIG. 4, the front is the right side of FIG. 4, the rear is the same left side, the left is the upper side of FIG. The lower side refers to the upper side, and the upper side refers to the front side of the sheet in the drawing, and the lower side refers to the back side.

In this specification, the inside means the inside of the building, and the outside means the outside.

FIG. 1 shows an assembled state of a side wall (10) in an assembled building such as a unit house. In the figure, the side wall (10) in the assembled building is rectangular as viewed from the plane, and this is the front and rear side wall panels (1) (2), and a pair of front and rear divided panels (3a) (3b) (4a) (4b) Left and right side panels
(3) (4), and connecting members (5) (5) made of extruded aluminum members connecting the same divided panels (3a) (3b) (4a) (4b). A floor panel (6) is arranged below the side wall (10) and a ceiling panel (7) is arranged above the assembled building.

As shown in FIG. 1 and in more detail in FIGS. 4 and 7, the front and rear side wall panels of the side wall (10) of the assembled building.
(1) The first and second hinge components (1) are respectively attached to the vertical frame members (11) and (12) made of extruded aluminum members on both left and right side edges of (2).
Vertical frames made of extruded aluminum on both front and rear outer edges of the front and rear split panels (3a) (3b) (4a) (4b) of the left and right side panels (3) and (4) Third hinge components (23) and (23) are provided on the members (21) and (21), respectively, and the front and rear split panels (3a) and (3b)
(4a) Fourth hinge components (24) and (24) are provided on the vertical frame members (22) and (22) made of an extruded aluminum member at the connection side edges of (4b), respectively, and each connecting member (5) Fifth and sixth hinge components (43) and (44) are provided on both front and rear edges.

At the four corners of the side wall (10) of the rectangular building viewed from the plane, the front and rear side wall panels
(1) First and second hinge components (13) and (14) of vertical frame members (11) and (12) of (2) and front and rear split panels of left and right side wall panels (3) and (4)
(3a) (3b) (4a) (4b) The third hinge components (23) (23) of the vertical frame members (21) on both outer sides are combined with each other to form front and rear side wall panels (1) (2). ), The divided panels (3a), (3b), (4a), and (4b) of the left and right side wall panels (3) and (4) are swingably connected by about 90 ° (see FIGS. 1 and 4).

The left and right side panels (3) and (3b) of the left and right side panels (3) and (4) are provided on the left and right sides of the side wall (10) of the assembled building.
(4a) The fourth hinge component (24) (24) of the connection side edge of (4b) is a connecting member (5) arranged in the middle between them The fifth and sixth hinge components (43) (43) ( 44), the divided panels (3a) (3b) (4a) (4b) on the same side are pivotally connected by about 180 ° via a connecting member (5) so as to be foldable (see FIG. 1 and FIG. 7).

The left and right side divided panels (3a) (3b) (4a)
In the folded state of (4b), the split panels (3a) (3b) (4a) (4
b) The third hinge components (23) and (23) are connected to the front and rear side wall panels (1).
It is detachable from the first and second hinge components (13) and (14) of (2) (see FIGS. 3 and 6).

In the above, the first and second hinge components (13) and (14) of the vertical frame members (11) and (12) of the front and rear side wall panels (1) and (2).
The comrades are symmetrical and opposite in direction, and the divided panels (3a) (3b) (4a) (4
Third hinge component (23) of the vertical frame members (21) (21) on both outer sides of b)
(23) Comrades are also symmetrical in front and back, and the directions are opposite to each other. Therefore, the structure of the first hinge component 13 and the third hinge component 23 at the front left corner of the side wall 10 of the assembled building will be described below in detail with reference to FIG. explain.

In FIG. 4, the vertical frame member (11) of the front side wall panel (1) has a substantially U-shaped horizontal cross section and has a hollow portion (20) on the left side. A guide portion (15) provided on the left wall of the hollow portion (20) of the vertical frame member (11) and having an arc-shaped cross section corresponding to an angle of approximately 90 ° in cross section; and a front side of the guide portion (15). The first hinge component (13) has an opening that opens to the left rear and has an angle of approximately 140 ° in cross section. A third hinge component fitting recess (17) having a corresponding arc-shaped guide surface (17a) is provided, and a fitting projection (18) is provided at a portion of the rear extension (16) near the base. And an inner convex portion (1) having a convex surface portion (19a) having an arc shape corresponding to an angle of approximately 150 ° in cross section inside the rear half of the rear overhang portion (16).
9) is provided.

On the other hand, the divided panel (3a) of the left side wall panel (3)
The vertical frame member (21) has a substantially U-shaped horizontal cross section,
The hinge component (23) extends forward from the left edge of the rear end of the vertical frame member (21) and has a convex portion (26) on the right side having an arc shape corresponding to an angle of approximately 140 ° in cross section. Overhang part (25)
And an engaging projection (27) having a front end (27a) having a substantially arc-shaped cross section and provided in a front protruding shape from a front end portion of the front projection (25). 3 On the front surface of the hinge component (23), engage the engaging projection (2) from the base of the front projection (25).
A guide surface (28) having an arc-shaped cross section leading to 7) is provided, and between the engagement convex portion (27) and the front end portion (25a) of the front overhang portion (25) is substantially viewed from a plane. A V-shaped fitting recess (29) is formed.

The front side panel (1) and the divided panel (3a) of FIG.
And via the first and third hinge components (13) and (23),
In the case of being connected while maintaining an angle of about 90 °, the front protrusion (3) of the third hinge component (23) is inserted into the fitting concave portion (17) of the first hinge component (13). 25) is fitted, and the convex section (26) of the cross section of the front projection (25) is aligned with the cross section guide surface (17a) of the concave section (17), and
Fitting convex part (18) of rear overhang part (16) of first hinge constituent part (13)
Is fitted into the fitting concave portion (29) of the third hinge component (23). In addition, the cross-section of the engaging projection (27) has a substantially arc-shaped tip (27a).
But, it is brought into contact with the starting end of the convex portion (19a) having an arc-shaped cross section of the inner convex portion (19) on the side of the rear projecting portion (16).

In addition, in the rear side wall of the hollow portion (20) of the vertical frame member (11) of the front side wall panel (1), the internal enlarged groove (3) for packing attachment is provided.
1) is provided, and a packing (33) having a hollow portion (32) is fitted into the internal enlarged groove (31). As described above, the front side wall panel (1) and the split panel (3a) are substantially 90 ° from each other.
In this case, the packing (33) is closely attached to the outer surface of the rear wall of the vertical frame member (21) of the divided panel (3a).

When folding the side wall (10) of the prefabricated building, as shown in FIGS. 2 and 5, the split panel (3a) swings 90 ° with respect to the left edge of the front wall panel (1). Moved and opened outward. At this time, the arc-shaped convex portion (26) of the front projecting portion (25) of the third hinge component (23) on the side of the split panel (3a) is connected to the first hinge component on the side of the front wall panel (1). Department (13)
Of the engaging projection (27) of the front projecting portion (25) is guided by the guide surface (17a) having an arc-shaped cross-section of the concave portion (17).
(27a) is guided by an arc-shaped convex surface (19a) of the inner convex portion (19) on the side of the first hinge component (13), and the first hinge component is
The distal end of the rear overhang portion (16) on the (13) side is guided by the guide surface (28) having a circular cross section of the third hinge constituting portion (23) on the split panel (3a) side.

The opening of the recess (17) for fitting the third hinge component of the first hinge component (13) on the front wall panel (1) side is connected to the third hinge on the split panel (3a) side. The distal end (25a) of the front projection (25) of the component (23) and the distal end (2
7a) and the front overhang (25) of the third hinge arrangement (23) is therefore, as shown in FIGS. The divided panel (3a) can pass through the opening of the part (13), and therefore can be detachably attached to the front side wall panel (1).

Next, as shown in FIGS. 1 and 7, the right and left side wall panels of the side wall (10) of the rectangular building viewed from the plane.
(3) In (4), the hinge components of the divided panels (3a) (3b) and (4a) (4b) connected via the connecting member (5) are symmetrical and opposite to each other. Therefore, the split panels (3a) and (3b) of one left side wall panel (3) and the connecting members
The connection structure with (5) will be described in detail with reference to FIG.

In FIG. 7, the vertical frame members (22) and (22) on the connection side of the front and rear divided panels (3a) and (3b) of the left side wall panel (3) have respective horizontal cross-sections whose openings are opposite to each other. It has a U shape. Opposing walls (22a) (22a) of these vertical frame members (22) (22)
Fourth hinge components (24) and (24) are respectively provided on the inner edges of the vertical frame members (24) and (24). (22a) (22a) projecting rearward or forward from the inner edge of (22a), respectively, and returning to the leading end of the engaging portion (35) (3)
Hinges (34) and (34) having a hook shape in cross section having a cross section 5) are provided. The front end portions (35a) and (35a) of the folded engagement portions (35) and (35) have a substantially semicircular cross section centered on the points (A) and (B).

On the other hand, on both front and rear sides of the connecting member (5), the folded engagement portions (35) (3) of the projections (34) (34) for the hook-shaped cross section are formed.
Fifth and sixth hinge components (43) and (44) having recessed grooves (45) and (45) into which 5) is inserted and provided inward are provided.

The folded engagement portions (35) and (35) of the hinge-forming projections (34) and (34) are connected to the fifth and sixth hinge-forming portions (43) from inside the concave grooves (45) and (45). ) (44) and the front and rear wall portions (46) and (46) and the engaging portions (47) and (47) extending from the front ends thereof toward the opening.

In the grooves (45) and (45), the front and rear divided panels (3 and 3) extend from the opening to the front or rear wall (46) and (46).
a) When the (3b) swings, the protrusions for the cross section hook-shaped hinge construction (34) (3
Guide surfaces (48) (48) having an arc-shaped cross section for guiding the distal ends of the folded engagement portions (35) (35) of 4) are formed.

The front and rear split panels of the left side wall panel (3)
(3a) The facing wall portion (22a) of the vertical frame member (22) (22) on the connection side of (3b)
On the outer edge of (22a), interval holding projections (36) and (36) having inward projections (36a) and (36a) at their tips are provided to face each other,
When the front and rear split panels (3a) and (3b) are connected on the same plane, so to speak, the protrusion at the tip of the spacing holding protrusion (36) (36)
(36a) (36a) Comrades are matched against each other. Also,
At the center of the opposing walls (22a) and (22a) of the vertical frame members (22) and (22), an internal expansion groove (37) for packing is provided, and a hollow portion (37) is formed in the internal expansion groove (37). A packing (39) having 38) is fitted. As described above, the front and rear split panels (3a) (3
When b) is connected on the same plane, these packings (33) are brought into close contact with the front and rear walls (46) and (46) of the connecting member (5).

When the side wall (10) of the assembled building is folded, as shown in FIGS. 2 and 8, the split panels (3a) and (3b) of the left side wall panel (3) are connected to the connecting member (5). ) Is pivoted by 90 ° with respect to the right and left side edges of the connection member.
(5) is folded in half to protrude outward. At this time, the fourth hinge components (24) (24) on the divided panels (3a) (3b) side
The leading end of the guide surface (4) having an arc-shaped cross section in the concave groove (45) (45) of the fifth and sixth hinge components (43) (44) on the connecting member (5) side.
8) Guided to (48). Also, the split panels (3a) (3b) associated with the fifth and sixth hinge components (43) (44) of the connecting member (5)
Folding engagement portions (35) (3) of the fourth fourth hinge component portion (24) (24)
5) is rotated as if these tips are the rotating cores (point A) and (point B), so that the two divided panels (3a) and (3b) are eventually connected via the connecting member (5). Is folded.

In the above, in order to assemble the side walls (10) constituting an assembled building such as a unit house, first, as shown in FIG. 2, the front and rear side wall panels (1) and (2) are stacked, and ) (2), the left and right side panels (3) and (4) folded through the connecting members (5) and (5) on the left and right sides.
b) (4a) and (4b) are arranged respectively, and divided panels (3
a) The split panel (3a) in the folded state of (3b) (4a) (4b)
(3b) The third hinge components (23) and (23) of (4a) and (4b) are attached to the first and second hinge components (13) and (14) of the front and rear side wall panels (1) and (2). After installation, the front and rear side wall panels (1) and (2) may be pulled to both front and rear outer sides.

As a result, as shown in FIG. 1, the divided panels (3a) (3b) (4a) (4b) of the left and right side panels (3) (4) are opened via the connecting members (5) (5). And a substantially rectangular side wall as viewed from the plane formed by the front and rear side wall panels (1) and (2) and the left and right side wall panels (3) and (4).
(10) is to be assembled.

As described above, in the assembled state of the side wall (10), for example, as shown in detail in FIG. 4, at the front left corner of the side wall (10), the third panel (3a) side
Circular arc-shaped convex part of the front extension part (25) of the hinge component part (23)
(26) is aligned along the guide surface (17a) of the arcuate cross section of the concave portion (17) of the first hinge component (13) on the side of the front wall panel (1), and the first hinge component is The fitting projection (18) of the rear projection (16) on the (13) side is fitted into the fitting recess (29) of the front projection (25) on the third hinge component (23) side, Left edge of front wall panel (1) and front split panel of left wall panel (3)
The front side edge of (3a) is connected to each other.

As shown in FIG. 1, the side wall of the assembled building
At the remaining three corners of (10), namely, the right front corner and the right and left rear corners, the right edge of the front wall panel (1) and the right side of the front split panel (4a) of the right wall panel (4) The edges and the left and right side edges of the rear side wall panel (2) and the left and right side edges of the rear divided panels (3b) and (4b) of the left and right side wall panels (3) and (4) are similarly connected, and Left and right side wall panels (3)
(4) itself, the connection side edges of these divided panels (3a) (3b) (4a) (4b) are connected on the same plane through the connecting members (5) (5) respectively. I have.

Next, the side wall (1) of the assembled building shown in FIG.
In order to reversely disassemble and disassemble 0), the front and rear side wall panels (1) and (2) of the side wall (10) which is substantially rectangular as viewed from the plane are pushed inward. At the same time, split panels (3a) (3b) (4a) (4b) of left and right side panels (3) and (4) with respect to front and rear side panels (1) and (2)
About 90 °, and split panels (3a) (3b) (4a) (4
b) Fold each other in two via the connecting members (5) and (5) (Fig. 2
reference).

Here, the divided panel (3) of the left side wall panel (3)
a) (3b) The details of the state where the comrades are folded outward through the connecting member (5) are shown in FIG.
FIG. 5 shows details of a state in which the front divided panel (3a) of the left side wall panel (3) swings by 90 degrees with respect to the left side edge of (1) and is opened outward.

Further, when the split panels (3a), (3b), (4a), and (4b), which are folded in two, are slightly opened and pulled to both sides of the front and rear side wall panels (1) and (2), FIG. As shown in FIG. 6, the hinge components (23) (23) of the vertical frame members (21) (21) on both outer sides of the divided panels (3a) (3b) (4a) (4b), and front and rear side wall panels (1) The coupling of the vertical frame members (11) and (12) of the (2) with the hinge components (13) and (14) is released, and the front and rear side wall panels (1) and (2) are separated from the split panel (3a) ( 3b) (4a) and (4b) are separated in a folded state.

According to the side wall (10) of the assembled building such as the unit house, the side wall (10) can be assembled and disassembled.
In addition, the disassembled panels can be stacked and compactly assembled, so that the transportation efficiency during transportation can be increased and the storage space can be reduced.

Assembling of the side wall (10) is performed by each panel (1) (2)
(3a) (3b) (4a) (4b) vertical frame members made of extruded aluminum
(11) (12) (21) Hinge component (13) (14) (23) Comrade or hinge component (24) (24) and hinge component of aluminum extruded connecting member (5) Since only (43) and (44) are simply fitted together, it is possible for even a layman to perform the work, and the assembling work is not troublesome, and the assembling accuracy can be reliably achieved.

The panels (1), (2), (3a), (3)
b) (4a) (4b) vertical frame members (11) (12) (21) (22) are each made of extruded aluminum, and the connecting member (5) is also made of extruded aluminum aluminum, Not limited to this, vertical frame members
(11) (12) (21) (22) and the connecting member (5) may be made of other metal or hard synthetic resin.

[0044]

As described above, the side wall in the prefabricated building according to the present invention is constituted by the front and rear side wall panels, the left and right side wall panels formed by a pair of front and rear divided panels, and the connecting member for connecting the divided panels on the same side. The first and second hinge components are respectively provided on the vertical frame members on the right and left side edges of the front and rear side wall panels, and the third and third hinge members are respectively provided on the vertical frame members on the front and rear side edges of the divided panels on the left and right side wall panels. A fourth hinge component is provided, and fifth and sixth hinge components are provided on both front and rear side edges of each connecting member. The first and second hinge components of the vertical frame member of the front and rear side wall panels are provided. The third hinge constituting portions of the vertical frame members of the divided panels on both outer sides of the side wall panel are combined with each other, so that the divided panels of the left and right side wall panels are approximately 90 with respect to the front and rear side wall panels.
° While being connected swingably, the fourth hinge component of the divided panel of the left and right side wall panels is combined with the fifth and sixth hinge components on both sides of the connecting member arranged in the middle of these, and The divided panels are foldably connected to each other via a connecting member, and when the divided panels on the same side are folded, the third hinge component of the divided panel is connected to the first and second hinge components of the front and rear side wall panels. According to the present invention, the horizontally long left and right side wall panels can be folded into two, and these divided panels can be attached to or removed from the front and rear side wall panels when the left and right side wall panels are folded. . As described above, the side wall of the assembled building according to the present invention can be assembled and disassembled, and furthermore, the disassembled panels can be piled up and compacted, so that the transportation efficiency during transportation can be greatly improved and the storage space is small. Sorry
Therefore, land utilization in factories and the like can be achieved.

Also, assembling the side walls of the assembled building is simple, because only the hinge components of the vertical frame members of each panel or the hinge components and the connecting members are simply fitted together. No hassle to work,
Also, assembling accuracy can be reliably achieved. Since the hinge component and the connecting member of the vertical frame member of each panel can both be made of an extruded aluminum material, there is no need to attach a conventional steel hinge or the like to the connecting portion of the panel. The effect of reducing the weight of the part and improving the aesthetic appearance of the side wall constituting the assembled building such as a unit house is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an assembled state of a side wall of an assembled building according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the side wall in a folded state.

FIG. 3 is a schematic perspective view showing a state where a panel is disassembled after folding a side wall.

FIG. 4 is an enlarged sectional view of a main part showing a state in which the front divided panel and the front side wall panel of the left side wall panel are joined in the embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a state where the front divided panel is opened by swinging by 90 °.

FIG. 6 is an enlarged cross-sectional view of a main part showing a state where the front divided panel is detached from a front side wall panel after being opened.

FIG. 7 is an enlarged sectional view of a main part showing a state in which front and rear divided panels of the left side wall panel are connected via a connecting member in the embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part showing a state in which the front and rear divided panels of the left side wall panel are folded into two.

[Explanation of symbols]

 1, 2 front and rear side wall panels 3, 4 left and right side wall panels 3a, 3b divided panel 4a, 4b divided panel 5 connecting member 11, 12 vertical frame member of front and rear side wall panels 13, 14 first and second hinge components 21, 22 division Panel vertical frame members 23, 24 Third and fourth hinge components 43, 44 Fifth and sixth hinge components

Claims (1)

(57) [Claims] 1. Left and right side panels (3) comprising front and rear side panels (1) and (2) and a pair of front and rear divided panels (3a) (3b) (4a) (4b).
(4) and connecting members (5) (5) connecting the same divided panels (3a) (3b) (4a) (4b), and the left and right side of the front and rear side wall panels (1) (2) First and second hinge components (13) and (14) are provided on the vertical frame members (11) and (12) on both side edges, respectively, and the divided panels (3a) and (3a) ( 3b, (4a) and (4b), third and fourth hinge components (23) and (24) are provided on the vertical frame members (21) and (22) on both front and rear edges, respectively. Fifth and sixth hinge components (43) and (44) are provided at the front and rear side edges, and the vertical frame members (11) of the front and rear side wall panels (1) and (2) are provided.
First and second hinge components (13) and (14) of (12), and split panels (3a) (3b) (4a) (4b) on both outer sides of left and right side panels (3) and (4)
The left and right side wall panels (3) and (4) are separated from the front and rear side wall panels (1) and (2) by combining the third hinge constituting portions (23) and (23) of the vertical frame member (21) with each other. Panels (3a) (3b) (4a) (4b) are approximately 9
0 ° swingable connection and left and right side panel
(3) The fourth hinge component (24) (24) of the divided panel (3a) (3b) (4a) (4b) of (4) is provided with a connecting member (5) disposed in the middle of the fourth hinge component (5). And the sixth hinge constituting portions (43) and (44), and the same side divided panels (3a) (3b) (4a) (4b) are foldably connected to each other via a connecting member (5), In the folded state of the split panels (3a) (3b) (4a) (4b) on the same side, the third hinge components (23) (23) of the split panels (3a) (3b) (4a) (4b)
Are detachably attached to the first and second hinge components (13) and (14) of the front and rear side wall panels (1) and (2).