JP2001339815A - Knockdown case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a metal-made case for storing an electrical equipment or the like by a certain number of parts, apply zinc plating to these parts, thereafter assemble the parts by using a fastener of bolt, nut, etc., without welding. SOLUTION: An upper/lower end of a rectangular tube having an opening in the front face is formed so as to be respectively closed by a roof 10 and a bottom plate 11, an edge material 10a extended in a downward direction is provided in the periphery of the roof, a protrusion 10b is provided in an inner surface of the edge material in its reverse side, a small hole 15f inserting the protrusion is drilled in a rear part of the rectangular tube, a mounting member 10e is provided to protrude in a reverse surface of eaves provided to extend to the forward from the roof, and a mounting member 16f mutually fixed to the mounting member by a fastener is provided in the rectangular tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal box, which is suitable for being installed outdoors for storing electric equipment such as a switchboard.

[0002]

2. Description of the Related Art Electrical devices such as switches and switchboards placed outdoors are housed in a steel plate box having a door on the front side to protect it from rain and wind. Conventionally, this type of box has a welded integral structure except for a door, and is entirely immersed in molten zinc and galvanized to prevent rust.

[0003] However, if the completed box is immersed in molten zinc, a box made with great precision will suffer from thermal distortion, which may cause a problem that the door cannot be attached properly.

[0004] Further, the box must be provided with a vent hole for allowing the air inside to escape so that the inner surface of the box is completely in contact with the molten zinc. Also, when taking out from the melting tank, it is necessary to make a drain hole so that molten zinc does not accumulate in the box. If such a hole is left as it is, rainwater enters, and the plug is welded and closed. However, when the plug is welded, the galvanized coating peels off due to heat, and the welding spot is unavoidably painted. However, over time, rust easily emerges from this spot.

[0005]

As described above, when the box body is assembled and then hot-dip galvanized, the above-described problem occurs. Therefore, an object of the present invention is to assemble galvanized parts using fasteners such as bolts and nuts without using welding.

[0006]

According to a first aspect of the present invention, there is provided an assembling box in which upper and lower ends of a rectangular tube are closed by a top plate and a bottom plate, respectively. An edge material extending downward is provided around the top plate, and a projection is provided on the inner surface of the edge material on the rear side. Drill a small hole at the rear of the square tube to accommodate this protrusion. An attachment member protrudes from the back surface of the eaves extending forward from the top plate. A mounting member fixed to the mounting member by a fastener is provided on the rectangular tube.

[0007] When assembling, the projection is inserted into the small hole of the square cylinder by tilting the top board, and then the top panel is put on the square cylinder so as to rotate around the projection. Then, the mounting member on the top plate side and the mounting member on the square tube side face each other, and they are fastened to each other using fasteners such as bolts and nuts.

According to the present invention, the top plate can be easily attached to the upper end of the rectangular tube using the fastener, and there is no possibility that rainwater will enter from the attachment portion. In addition, since the assembly is performed without using any welding, the top plate and the square tube can be plated (zinc hot-dip plating) in advance, so that a rust does not easily appear and a highly accurate box can be obtained.

According to a second aspect of the present invention, there is provided an assembling box in which an upper end of a rectangular tube having an opening on a front surface is closed by a top plate, and a lower end is closed by a bottom plate inserted from the opening. A small hole is formed in the peripheral edge material of the bottom plate so that the projection enters, and an edge material for supporting the bottom plate is provided on the wall of the rectangular tube opposite to the projection.

[0010] In the assembly, the bottom plate is inserted into the square tube through the opening, the projection is inserted into the small hole by tilting the bottom plate, and the opposite side is pushed into the square tube. In this case, one side of the bottom plate is supported by the protrusion, and the opposite side is supported by the edge material of the rectangular tube.

As described above, according to the present invention, the rectangular tube can be easily mounted simply by fitting the bottom plate into the lower end thereof, and there is no danger of falling off or rainwater entering. Further, since no welding is used for mounting, the bottom plate and the rectangular tube can be plated (zinc hot-dip plating) in advance.
Is the same as

According to a third aspect of the present invention, there is provided an assembling box, wherein the square tube according to the first or second aspect is constituted by a square tube main body and upper and lower connecting members having the same width as the opening. An upper front wall is formed, and the lower connecting member forms a front wall below the opening. As described above, since the rectangular cylinder is divided into three parts, each part has a simple shape, can be easily formed by sheet metal pressing, and the manufacturing cost can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This box is made of an iron plate, and as shown in FIG. 1, comprises a box body 1 and a door 3 attached to a front surface thereof by a hinge 2 so as to be openable and closable. It can be attached to building walls or utility poles. An electric device such as a switchboard is housed in the box, and electric wires are guided into the box through holes 5 formed in the bottom plate.

The edge 3a of the door 3 is integrally formed by a sheet metal press, and after the edges of the edge are welded to each other, the door 3 is hot-dip galvanized. Opening / closing handle (not shown) on the front side of the door
, And a lock fitting 6 connected thereto is attached to the back side. A packing 7 is adhered to the back side of the door.

The box body 1 is composed of five parts, each part being subjected to hot-dip galvanizing and then assembled. As shown in FIG. 2, the box main body includes, as shown in FIG. 2, a rectangular tube 9 having a substantially U-shaped cross section, and a top plate 10 and a bottom plate 11 that respectively close the upper and lower sides thereof. The square tube 9 has an opening 12 on the front surface, and around the opening, there is an opening edge material 13 protruding forward. When the door 3 is closed, the packing 7 comes into contact with the opening edge material.

The square tube 9 is actually formed as shown in FIG.
It comprises a rectangular cylinder main body 15 and upper and lower connecting members 16 and 17.
The rectangular tube main body 15 is composed of respective parts constituting a rear wall 15a, left and right side walls 15b, front walls 15c on both sides of the opening, and left and right edge members 13a, and the whole is integrally formed by a sheet metal press.
A screw tube 19 for attaching a mounting bracket is welded to the back surface (FIG. 4).

The upper connecting member 16 is formed in a U-shape in cross section by a sheet metal press. The lower side of the U-shape constitutes the upper opening edge member 13b, and the vertical side is the upper part of the opening of the rectangular cylinder. The support part 16c which supports the front wall 16b and the top side supports the top plate
Is configured. At both ends of the upper connecting member 16, there is a connecting portion 16 d which is bent later, and a connecting portion 15 g which is a counterpart of this connecting portion is formed so as to be bent back from the front wall of the rectangular tube main body 15. 16d and 15g are combined and tightened with the bolt and nut 20 (see also FIG. 4).

The top plate 10 has a downwardly facing rim 10 around its periphery.
a is integrally formed by a sheet metal press, and the edges of the edge material are joined by welding. A pair of left and right protrusions 1 on the inner surface of the rear edge of the top plate
0b is welded. A small hole 15f is formed in the rear wall 15a of the rectangular tube to receive these projections 10b. The top plate has a front and rear dimension larger than that of the rectangular tube, and forms an eave 10 d on the opening 12 when attached. On the back of this eave,
A pair of right and left mounting members 10e are welded. Upper connecting member 1
In FIG. 6, a mounting member 16f, which is a counterpart of these mounting members 10e, extends downward.

When mounting the top plate 10, as shown in FIG. 4, first, the rear portion of the top plate is fitted into the rectangular tube 9 while the projections 10b are inserted into the small holes 15f. 10d) is placed on the upper connecting member 16. This causes the mounting member 10e and the mounting member 16f to overlap with each other.

The lower connecting member 17 is Z-shaped by a sheet metal press.
The upper side of the letter Z forms a lower edge 13c, the vertical side forms a front wall 17b below the opening, and the lower side forms an edge 17c supporting the bottom plate 11. At both ends of the lower connecting member, a connecting portion 17d which is bent later is provided, and a connecting portion 15h which is a counterpart of the connecting portion is formed so as to be bent back from the front wall 15c of the rectangular cylinder main body. And tighten them with bolts and nuts 22 (see also FIGS. 4 and 5).

The bottom plate 11 has a peripheral material 11a formed integrally with the periphery thereof by press forming.
A small hole 11b into which the projection 15i welded to a is inserted is made. Further, a slit 11c is formed on the front side of the bottom plate in order to avoid the connection portions 15h and 17d. When attaching the bottom plate 11, as shown in FIG. 4, after the bottom plate is inserted into the inside of the rectangular tube 9 through the opening 12, first, the rear edge of the bottom plate is pressed against the projection 15i, and the front side of the bottom plate is moved downward. Push it in until it contacts the connecting member 17. By doing so, the small holes 11b in the bottom plate
The projection 15i is inserted and fixed. Since it becomes an obstacle when fitting the bottom plate in this way, the upper bolt and nut 22 for tightening the connection portions 15h and 17d should not be attached, and should be attached after the bottom plate is fitted.

[Brief description of the drawings]

FIG. 1 is a perspective view of a box.

FIG. 2 is an exploded perspective view of a box being assembled.

FIG. 3 is an exploded perspective view further illustrating a rectangular tube.

FIG. 4 is a vertical sectional view of a box.

FIG. 5 is a horizontal sectional view of the box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box main body 3 Door 9 Square tube 10 Top plate 10a Edge material 10b Projection 10e Mounting member 10d Eave 11 Bottom plate 11a Edge material 11b Small hole 12 Opening 13 Opening edge material 15 Square tube main body 15f Small hole 16 Upper connecting member 16b Front wall 16f Mounting member 17 Lower connection member 17b Front wall

Claims (3)

[Claims] An upper end and a lower end of a rectangular tube having an opening in a front surface are closed by a top plate and a bottom plate, respectively, and an edge member extending downward is provided around the top plate. A projection 10b is provided on the inner surface of the side edge material, a small hole 15f is formed in the rear portion of the square tube, and a mounting member 10e is protruded from a back surface of an eave extending forward from the top plate. Attachment member 16f fixed to attachment member by fastener
Type box provided with 2. An upper end of a square tube 9 having an opening 12 on the front surface is closed by a top plate 10 and a lower end thereof is closed by a bottom plate 11 inserted from the opening. A projection 15i is formed on the inner surface of the square tube. A small hole 11 in which the projection enters the peripheral edge material 11a of the bottom plate.
b, and a rim member 17c for supporting the bottom plate is provided on the wall of the rectangular tube opposite to the protrusion. 3. The rectangular cylinder comprises a rectangular cylinder main body 15 and upper and lower connecting members 16 and 17 having the same width as the opening,
The upper connecting member 16 constitutes a front wall 16b above the opening, and the lower connecting member 17 is a front wall 17b below the opening.
3. The prefabricated box according to claim 1, which constitutes b.