JP2020114747A - Box pallet - Google Patents

Abstract

To provide a long-lasting box pallet capable of disposing a wall panel in a state of standing by a simple constitution, and improving stability of the wall panel in a state of standing as compared with a conventional box pallet.SOLUTION: A box pallet has a bottom panel 11, restriction members 12-15 erected at the four corners of the bottom panel, front/rear and left/right wall panels 16-19, and locking means 44 provided on the left/right wall panels 18 and 19 having square pipes 27 and 28 on both sides. The locking means 44 is rotatably provided via a shaft 48 that penetrates the square pipes 27 and 28 in a left/right direction, and has a lock plate part 47, a U-shaped metal fitting 45 that has an arm part 46 connected to both sides of the lock plate part, and a guide part in which an inclined surface 41 is provided inward in the left/right direction at the upper ends of the restriction members 12 and 15 and a horizontal surface 42 is provided outside thereof. The U-shaped metal fitting 45 is lifted upward while a lower surface thereof slides along the inclined surfaces 41 of the restriction members 12 and 15, and a tip part of the U-shaped metal fitting is dropped and fitted onto the upper parts of the restriction members 12 and 15, and the state is maintained.SELECTED DRAWING: Figure 1

Description

The present invention relates to a foldable box pallet that can be carried by a carrying means such as a forklift or a crane.

Conventionally, for example, when transferring parts and materials used for construction and civil engineering to an assembly factory or a construction site, or when transferring machine parts manufactured in a machine factory to another assembly factory, a box-shaped box pallet Is used.
As the box pallet, for example, in Patent Document 1, a wire mesh-shaped bottom panel, four foldably arranged wall panels standing upright on the front, rear, left, and right sides of the bottom panel, and four corners of the bottom panel are disclosed. There is disclosed a leg having a regulating member that stands upright and a locking device that holds the wall panel in a standing state. In this patent document 1, a U-shaped engaging member (hook member) whose one end is rotatably supported is provided on the left and right wall panels, and when the left and right wall panels are erected, The other end is engaged with the engaged portion on the regulating member side. This prevents external wall factors (for example, strong winds, vibrations, and sloping ground in the work place) from acting on the erected wall panel to inwardly fall again, thereby making it possible to reliably support the wall panel on its own.

Further, in Patent Document 2, rotatable hook-shaped locking members are provided on both left and right sides of the front and rear wall panels, and when the front and rear wall panels are erected, the locking members are provided at four corners of the bottom panel. A technique is disclosed in which the upper end of each standing leg panel is detachably engaged.
In Patent Document 3, a hook member that is swingable around a horizontal axis is provided at an upper protruding piece portion provided at each corner of a bottom panel, and hook members are provided at strut portions of left and right wall panels. There is disclosed a technique in which a hooking portion capable of locking the tip claw portion is provided and the tip claw portion is locked to the hooking portion of the column.

Utility model registration No. 3150257 Utility model registration No. 3204871 Utility model registration No. 321040 publication

However, the above conventional techniques still have the following problems to be solved.
Since the technique of Patent Document 1 has a configuration in which only the other end of the U-shaped engaging member is hooked on the leg, it is possible to suppress the swinging (movement) of the wall panel in the standing state in the tilting direction. However, there is a problem of poor stability. Further, since the engaging member is easily disengaged from the regulating member, a protruding engaged portion is required, and there is a problem that the engaging portion is worn and the engaged portion becomes ineffective.
Further, since the technique of Patent Document 2 has a configuration in which the hook-shaped locking member is simply engaged with the upper end of the leg panel, it is not possible to suppress the swaying of the wall panel in the standing state, as in Patent Document 1 described above. Furthermore, since the front side of the locking member projects outward, for example, an operator may be caught and the wall panel may be bulky when folded.
Since the technique of Patent Document 3 has a configuration in which the hook member provided on the upper protruding piece is simply locked to the hanging portion of the pillar of the wall panel, like the Patent Document 2 described above, the hook member of the wall panel in the upright state is The shaking cannot be suppressed, and the base side of the hook member may project outward to be caught by an operator.

The present invention has been made in view of the above circumstances, and provides a box pallet with a simple structure that can make a wall panel in an upright state and can improve the stability of the wall panel in the upright state as compared with the conventional case, and has a long life. The purpose is to do.

A box pallet according to the present invention which meets the above-mentioned object, has a rectangular bottom panel,
A restriction member having an L-shaped cross section, which is provided upright at each of the four corners of the bottom panel;
Left and right wall panels each having a square pipe having a quadrangular cross section whose lower portion is rotatably connected to an intermediate position of the regulating member,
A lower end of the bottom panel is rotatably connected to the front and rear of the bottom panel, and in a standing state, the front and rear wall panels are held by the square pipe through a supporting means and can be folded on the bottom panel.
In a box pallet having locking means for holding the square pipes of the left and right wall panels in the standing state in an upright state,
The locking means is rotatably provided via a shaft that penetrates the square pipe in the left-right direction, has a lock plate part, and arm parts connected to both sides of the lock plate part. A U-shaped metal fitting having an acute angle (θ) between the abutment surface of the lock plate portion that abuts on the regulation member and the center line of the arm portion, and an inclined surface inward in the left-right direction at the upper end of the regulation member. However, it has a guide part provided with a horizontal surface on the outside,
When the left and right wall panels are erected from the tilted state, the U-shaped metal fittings are lifted upward while the lower surface of the arm portion slides along the inclined surface of the regulation member, When the wall panel rises, the tip of the lifted U-shaped metal fitting is dropped and fitted on the upper portion of the regulation member to maintain the state.

In the box pallet according to the present invention, it is preferable that the angle (θ) is in the range of 30 to 70 degrees.

In the box pallet according to the present invention, it is preferable that the U-shaped metal fitting is provided only on one side of the square pipe provided on both sides of each of the left and right wall panels.

In the box pallet according to the present invention, the locking means includes a U-shaped metal fitting that is rotatably provided via a shaft that penetrates the square pipe in the left-right direction, and an inclined surface inward in the left-right direction at the upper end of the restriction member. , And a guide portion provided with a horizontal surface on the outer side thereof.
Thus, when the left and right wall panels are erected from the tilted state, the lower surface of the arm portion of the U-shaped metal fitting slides along the inclined surface of the regulation member, so that, for example, an operator It is possible to lift the U-shaped metal fitting upward only by raising the left and right wall panels without manually operating. Then, when the left and right wall panels are erected, the tips of the lifted U-shaped metal fittings fall into the upper part of the regulation member and are maintained in that state. Shaking in the width direction of the bottom panel can be restricted more than before.
The U-shaped metal fitting has a lock plate part and arm parts connected to both sides of the lock plate part, and the contact surface of the lock plate part, which comes into contact with the regulation member when locked, and the center line of the arm part. Since the angle (θ) is an acute angle, the lock plate portion of the U-shaped metal fitting is arranged along the regulation member, and the U-shaped metal fitting can be prevented from protruding outward as in the conventional case. The risk of being caught by an operator can be reduced more than ever before.
Therefore, the wall panel can be erected with a simple structure, the stability of the wall panel in the erected state can be improved, and the life can be extended.

(A) and (B) are the front views and side views of the box pallet which concerns on one embodiment of this invention, respectively. It is a top view of the box pallet. (A)-(C) is a front view, a side view, and a top view of the U-shaped metal fitting attached to the wall panel of the box pallet, respectively. It is a front view which shows the standing process of the left wall panel of the box pallet. It is a side view which shows the standing state of the square pipe of the wall panel of the same left.

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
As shown in FIGS. 1 to 5, a box pallet 10 according to an embodiment of the present invention is configured to be foldable so that it can be transported by a transportation means such as a forklift or a crane, and has a rectangular shape ( (Rectangular or square) bottom panel 11, front and rear wall panels in which lower ends are rotatably connected to the front and rear of the bottom panel 11 and restricting members 12 to 15 that are respectively installed upright at four corners of the bottom panel 11. 16 and 17 and left and right wall panels 18 and 19 whose lower parts are rotatably connected to the regulating members 12 to 15. Hereinafter, the tilt directions of the front and rear wall panels 16 and 17 are the front and rear directions of the box pallet 10 (bottom panel 11), and the tilt directions of the left and right wall panels 18 and 19 are the left and right directions of the box pallet 10 (bottom panel 11) (width direction). ) Will be described in detail.

As shown in FIGS. 1(A), 1(B), and 2, the bottom panel 11 includes a rectangular frame 20 in which steel frame members are arranged in a rectangular shape, and a wire attached to the upper surface of the rectangular frame 20. It is composed of a net 21. As the frame member, a square tube-shaped pipe (square pipe), an angle member having an L-shaped cross section, or the like can be used.
As shown in FIG. 1(A), the front and rear wall panels 16 and 17 include a long steel beam member 22 that constitutes the upper edge thereof, and an upper wire net 23 that is hung from the beam member 22. The lower wire net 24 is connected to the lower end of the upper wire net 23. The upper wire net 23 and the lower wire net 24 are connected by a coil-shaped connecting wire 25 so as to be bendable in the front-rear direction of the box pallet 10.
In addition, the left and right wall panels 18 and 19 are welded to the long beam member 26 made of steel, which constitutes the upper edge thereof, and both end portions of the beam member 26, respectively, as shown in FIG. 1(B). It has a gate-shaped frame 29 composed of square pipes 27 and 28 having a rectangular cross section, and a wire net 30 attached inside the frame 29.

As shown in FIG. 1(A), the lower end portions of the lower wire nets 24 on the front and rear wall panels 16 and 17 are provided on the front end portion and the rear end portion of the bottom panel 11 (the front side portion and the rear side portion, respectively). It is attached to the bottom panel 11 by a door hinge fitting (engaging fitting) 31 provided along the rear side portion.
As a result, the wall panel 16 arranged on the front side can be folded over the bottom panel 11 with the front end portion of the bottom panel 11 as a base point (it can be tilted in the front-back direction of the box pallet 10), and the bottom panel 11 in the upright state can be folded. It can stand up along the front side of the panel 11. Further, the wall panel 17 arranged on the rear side is foldable on the bottom panel 11 with the rear end of the bottom panel 11 as a reference point (it can be tilted in the front-back direction of the box pallet 10), and in the standing state. It can stand up along the rear side of the bottom panel 11.

An upper lock (an example of a support means) 32 is provided at each upper position on both sides of the upper wire net 23 and each upper position on both sides of the lower wire net 24. The lock 32 has a bearing 33 welded to the upper and lower wire nets 23 and 24, and a slider 34 supported by the bearing 33. A handle 35 is welded to the slider 34, and the lock 32 is attached to the lock 32. A guide plate 36 is arranged at an adjacent outer position in the width direction.
The slider 34 is loosely fitted to the bearing 33 and supported so as to be capable of advancing and retreating in the horizontal direction, and the guide plate 36 enables accurate outward movement. , 19 of the square pipes 27 and 28 can be inserted into small holes (not shown). As a result, the front and rear wall panels 16 and 17 are held by the square pipes 27 and 28 via the lock 32 so that the standing state can be maintained.

As shown in FIGS. 1(A), (B), FIG. 4 and FIG. 5, the wall panel 18 arranged on the left side is a square pipe on one side of the wall panel 18 so as to be tilted in the left-right direction of the bottom panel 11. A lower end of 27 is supported at a middle position in the height direction of the regulating member 12, and a lower end of the other square pipe 28 is supported at a middle position in the height direction of the regulating member 14 so as to be rotatable by bolts (rotating pins) 37. (The axis of the bolt 37 is aligned with the front-back direction of the box pallet 10). In addition, the lower ends of the square pipes 27 and 28 on both sides of the wall panel 19 are arranged in the height direction of the restricting members 13 and 15 so that the wall panel 19 arranged on the right side also tilts in the width direction of the bottom panel 11. It is rotatably supported by a bolt 37 at an intermediate position. A bracket 38 is welded to the upper ends of the square pipes 27 and 28, and a hanging ring 39 of the box pallet 10 is attached to the bracket 38.
As a result, the left and right wall panels 18, 19 are foldable (inclinable in the width direction of the box pallet 10) on the front and rear wall panels 16, 17 folded on the bottom panel 11, respectively. In the standing state, the bottom panel 11 can stand up along both side portions in the left-right direction.

The regulating members 12 to 15 are made of steel, and as shown in FIGS. 1(A), 1(B) and 2, they are fixedly attached to the four corners (corner positions) of the bottom panel 11 in an upright state. There is. Specifically, the restriction members 12 to 15 are L-shaped in cross section, and are attached in a state where the inner side surface at the middle position in the height direction is brought into contact with the corner outer side surface of the rectangular frame 20 of the bottom panel 11. It is fixed. The base 40 is attached and fixed to the lower ends of the restricting members 12 to 15, so that it is possible to arrange the box pallets 10 on the floor or stack a plurality of box pallets 10 in a stack. There is.
As a result, the inner side surfaces of the regulation members 12 to 15 come into contact with the lower outer surfaces of both side end portions of the left and right standing wall panels 18 and 19, and the front and rear wall panels 16 and 17 are restrained from each other. It is possible to prevent each of the wall panels 16 to 19 from falling to the outside of the bottom panel 11 by restricting the tilting to the outside by ˜15. The front and rear wall panels 16 and 17 may be configured to fall outward of the bottom panel 11.

As shown in FIGS. 1(A) and 4, the front upper ends of the regulating members 12 and 13 arranged on the front side of the box pallet 10 and the rear upper ends of the regulating members 14 and 15 arranged on the rear side are An inclined surface (inclined portion) 41 having a downward slope is formed from the center portion in the left-right direction of each of the regulating members 12 to 15 to the inner end portion. The lateral outside of the regulating members 12 to 15 (outside of the inclined surface 41) is a horizontal surface (flat portion) 42 connected to the inclined surface 41.
The inclined surface 41 and the horizontal surface 42 form a guide portion.
In addition, as shown in FIG. 1B and FIG. 5, the upper left side of the regulating members 12 and 14 arranged on the left and right of the box pallet 10 and the right side of the regulating members 13 and 15 arranged on the right and front of the box pallet 10. The upper part is connected to the horizontal plane 42 described above and forms a horizontal plane (flat portion) 43 having the same height as the horizontal plane 42.
Ribs are formed on the upper portions (regions including the horizontal surfaces 42 and 43) of the restriction members 12 to 15 for strength reinforcement.

As shown in FIGS. 1(A), 1(B), and FIGS. 3 to 5, the square pipe 27 on the front side (one side) of the wall panel 18 arranged on the left side is a regulating member in a standing state. The lock means 44 for holding the square pipe 28 on the rear side (one side) of the wall panel 19 arranged on the right side is a lock means for holding the square pipe 28 on the regulating member 12 in an upright state. 44 are provided respectively. The locking means 44 has the guide portion of the regulating member 12 and the U-shaped metal fitting 45, and by fitting the U-shaped metal fitting 45 on the upper portion of the regulating member 12, the locking panels 44 of the wall panels 18, 19 are provided. The standing state can be maintained.
As shown in FIGS. 3A to 3C, the U-shaped metal fitting 45 is made of steel and has a U-shaped cross-section. The arm portions 46 are arranged to face each other with a space, and the arm portions. The lock plate portion 47 is connected to the tip of the lock plate portion 46 (that is, the pair of arm portions 46 is connected to both sides of the lock plate portion 47).

In the U-shaped metal fitting 45 provided on the wall panel 18 arranged on the left side, the base of the arm portion 46 moves the square pipe 27 in the left-right direction so that the lock plate portion 47 is arranged on the front side of the square pipe 27. It is rotatably provided on the square pipe 27 via a bolt (an example of a shaft) 48 penetrating therethrough. Further, in the U-shaped metal fitting 45 provided on the wall panel 19 arranged on the right side, the base of the arm portion 46 holds the square pipe 28 so that the lock plate portion 47 is arranged behind the square pipe 28. It is rotatably provided on the square pipe 28 via a bolt 48 penetrating in the left-right direction.
As a result, the axis of the bolt 48 is aligned with the left-right direction of the box pallet 10, so that even when the left and right wall panels 18 and 19 are tilted, unless the U-shaped bracket 45 is subjected to an external force, It is possible to prevent or even prevent the character fitting 45 from rising from the front surface of the square pipe 27 or the back surface of the square pipe 28.

Here, the interval (inner width) D of the opposing arm portions 46 is, for example, wider than the width of the square pipes 27, 28 by about 1 to 10 mm. As a result, the operation of the U-shaped metal fitting 45 can be made smooth, and the protrusion from the square pipes 27, 28 can be reduced, so that, for example, an operator can be prevented from being caught.
Further, as shown in FIG. 3B, the tip of the arm portion 46 is bent at an angle larger than the L-shape and is horizontal (the tip of the arm portion 46 is a horizontal portion). Exist). In use, since the lower surface of the arm portion 46 slides along the inclined surface 41 of the regulating member 12 as shown in FIG. 4, the arm portion 46 is regulated by making it horizontal as described above. The members 12 and 15 can be easily placed on the inclined surface 41.

Since the tip portion of the U-shaped metal fitting 45 needs to be smoothly lifted by the inclined surface 41 of the regulating members 12 and 15 when the wall panels 18 and 19 are erected, the downward inclination angle of the inclined surface 41 with respect to the horizontal position. It is preferable that θ1 be, for example, about 30 to 60 degrees (further, 40 degrees or more and 50 degrees or less).
As shown in FIG. 5, the U-shaped metal fitting 45 has a contact surface (rear surface) of the lock plate portion 47 that abuts on the restriction member 12 when the U-shaped metal fitting 45 is locked on the upper portion of the restriction member 12. An angle θ2 with the center line of the arm portion 46 is an acute angle (see FIG. 3B).
The inclination angle θ2 of the arm portion 46 with respect to the lock plate portion 47 depends on the length of the arm portion 46, but is, for example, about 30 to 70 degrees.

With the above-described configuration, for example, as shown in FIGS. 4 and 5, when the wall panel 18 arranged on the left side is erected from the tilted state, the lower surface of the arm portion 46 causes the regulating member 12 to move downward. The U-shaped metal fitting 45 is lifted upward while sliding along the inclined surface 41.
Then, when the wall panel 18 is erected, the tip of the lifted U-shaped metal fitting 45 falls and fits on the upper front side of the regulating member 12 to maintain the state (the wall arranged on the right side). Panel 19 is the same). At this time, since the width of the horizontal surface 42 of the regulating member 12 is narrower than the width of the square pipes 27, 28 (for example, about 40 to 90% of the width of the square pipes 27, 28), the left side of the U-shaped metal fitting 45 (one The inner surface of the arm portion 46 on the side) abuts on the outer surface of the regulating member 12 (or is arranged with a slight gap), and the lower end of the arm portion 46 on the right side (the other side) of the U-shaped metal fitting 45 is located. Since it abuts on the inclined surface 41, the swinging of the wall panel 18 in the tilting direction is limited, and the standing state is maintained.

Subsequently, a method of using the box pallet 10 according to the embodiment of the present invention will be described.
When the box pallet 10 is not used, the front and rear wall panels 16, 17 are folded (fallen) on the bottom panel 11, and the left and right wall panels 18, 19 are folded (fallen) on it. ..
In use, the operator sequentially raises the wall panels 16 to 19 folded and folded on the bottom panel 11 into the states shown in FIGS. 1(A), 1(B) and 2. The details will be described below.

First, the operator stands up the wall panel 18 arranged on the left side, as shown in FIG.
When the wall panel 18 is tilted down, the lower end of the lock plate portion 47 of the U-shaped metal fitting 45 contacts the front surface of the square pipe 27, and the upper side of the lock plate portion 47 has a small gap with the front surface of the square pipe 27. It is in a state of having.
When the operator stands up the wall panel 18, after the lower left end of the U-shaped metal fitting 45 contacts the inclined surface 41 of the regulating member 12, the lower surface of the arm portion 46 is changed to the inclined surface 41 of the regulating member 12. The U-shaped metal fitting 45 is lifted upward while sliding along.

Then, when the wall panel 18 is in an upright state, the tip of the lifted U-shaped metal fitting 45 falls onto the upper part of the front side of the regulation member 12 and is fitted to maintain the state. As a result, as described above, the swing of the wall panel 16 in the tilting direction is limited, and the standing state is maintained.
At this time, the lock plate portion 47 of the U-shaped metal fitting 45 is arranged parallel to the front surface of the square pipe 27 as shown in FIG. That is, the gap formed between the lock plate portion 47 and the front surface of the square pipe 27 is approximately the same as the thickness of the regulating member 12. This is because the lock plate portion 47 is inclined with respect to the arm portion 46 as described above. As a result, the protrusion of the U-shaped metal fitting 45 can be made small, and for example, it can be prevented that an operator is caught.

The worker also raises the wall panel 19 arranged on the right side in the same manner as described above. When the wall panel 19 arranged on the right side is folded on the wall panel 18 arranged on the left side, the wall panel 19 arranged on the right side is erected first.
Next, the worker raises the front and rear wall panels 16 and 17, respectively.
After the front and rear wall panels 16 and 17 are respectively erected, the locks 32 are used to lock the left and right wall panels 18 and 19, respectively, to maintain the erected state.
As a result, the box pallet 10 is ready for use as shown in FIGS. 1(A), 1(B) and 2.

After using the box pallet 10, the operator folds the front, rear, left and right wall panels 16 to 19 on the bottom panel 11 by the following method.
First, the worker releases the front and rear wall panels 16 and 17 and the left and right wall panels 18 and 19 by using the respective locks 32, and places the front and rear wall panels on the bottom panel 11. Defeat 16, 17
Next, the worker lifts up the lock plate portion 47 of the U-shaped metal fitting 45 provided on the wall panel 18 arranged on the left side, like the U-shaped metal fitting 45 shown by the chain double-dashed line in FIG. (The U-shaped metal fitting 45 is tilted about the bolt 48), and the U-shaped metal fitting 45 is removed from the upper portion of the regulation member 12. Then, the wall panel 18 is laid down on the front and rear wall panels 16 and 17 folded on the bottom panel 11. In a manner similar to this method, the operator also tilts the wall panel 19 arranged on the right side onto the bottom panel 11.
As a result, the box pallet 10 is in a folded state.

Although the present invention has been described above with reference to the exemplary embodiments, the present invention is not limited to the configurations described in the above-described exemplary embodiments, and includes the matters described in the claims. It also includes other embodiments and modifications that are conceivable within the scope. For example, the case where the box pallet of the present invention is configured by combining a part or all of the respective embodiments and modifications described above is also included in the scope of the present invention.
In the above-described embodiment, the case where the U-shaped metal fittings are provided only on the square pipes on one side of the left and right wall panels has been described, but they can be provided on the square pipes on both sides of the wall panel, respectively. A pivot pin may be used instead of the bolt for attaching the U-shaped bracket to the square pipe.

10: Box pallet, 11: Bottom panel, 12-15: Control member, 16-19: Wall panel, 20: Rectangular frame, 21: Wire net, 22: Beam material, 23: Upper wire net, 24: Lower wire Net, 25: connecting wire, 26: beam material, 27, 28: square pipe, 29: frame, 30: wire net, 31: door hinge fitting, 32: lock (supporting means), 33: bearing, 34: slider , 35: handle, 36: guide plate, 37: bolt, 38: bracket, 39: hanging ring, 40: base, 41: inclined surface, 42, 43: horizontal surface, 44: locking means, 45: U-shape Metal fittings, 46: Arm part, 47: Lock plate part, 48: Bolt (shaft)

Claims (3)

A rectangular bottom panel,
A restriction member having an L-shaped cross section, which is provided upright at each of the four corners of the bottom panel;
Left and right wall panels each having a square pipe having a quadrangular cross section whose lower portion is rotatably connected to an intermediate position of the regulating member,
A lower end of the bottom panel is rotatably connected to the front and rear of the bottom panel, and in a standing state, the front and rear wall panels are held by the square pipe through a supporting means and can be folded on the bottom panel.
In a box pallet having locking means for holding the square pipes of the left and right wall panels in the standing state in an upright state,
The locking means is rotatably provided via a shaft that penetrates the square pipe in the left-right direction, has a lock plate part, and arm parts connected to both sides of the lock plate part. A U-shaped metal fitting having an acute angle (θ) between the abutment surface of the lock plate portion that abuts on the regulation member and the center line of the arm portion, and an inclined surface inward in the left-right direction at the upper end of the regulation member. However, it has a guide part provided with a horizontal surface on the outside,
When the left and right wall panels are erected from the tilted state, the U-shaped metal fittings are lifted upward while the lower surface of the arm portion slides along the inclined surface of the regulation member, The box pallet, characterized in that, when the wall panel of (1) is erected, the tip of the lifted U-shaped metal fitting is drop-fitted on the upper portion of the regulation member to maintain the state. The box pallet according to claim 1, wherein the angle (θ) is in the range of 30 to 70 degrees. The box pallet according to claim 1 or 2, wherein the U-shaped metal fittings are provided only on one side of the square pipes provided on both sides of each of the left and right wall panels.

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