JPH07118860B2 - Electrical box equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) [0001] The present invention relates to an electrical box device embedded in a concrete block for a building, a prefabricated material or the like.

(Prior Art) There is a building method in which floors, ceilings, walls, etc. of a building are preconfigured with concrete plates and are assembled. When adopting such a construction method, the concrete board has an electric box for burying a pipe for indoor wiring in advance, pulling an electric wire from the buried pipe to the outside, and arranging a switch on the wall. Buried.

Conventionally, many electric boxes of this type have a rectangular bottom. However, in the case of the square type, the method of attaching to the conduit is limited to four directions due to the side surface of the box.

FIG. 5 shows a conventional electric box device, which includes a box body 11 and a conduit tube 12 attached to a side surface of the box body 11.
13 examples are shown. Further, FIG. 6 shows a state in which the box body 11 and the electric conduits 12 and 13 are buried inside the concrete plate 14, and the opening of the box body 11 is exposed from the side wall of the concrete plate 14. The conduits 12 and 13 thus embedded are wired, and a switch circuit board, for example, is arranged inside the box body 11, and the board is electrically connected. Also, in the opening of the box 11,
A decorative plate is put on so as to expose the switch operator.

(Problem to be Solved by the Invention) According to the above-described conventional electric box device, the arrangement direction of the conduit is limited, which is inconvenient when the piping direction is changed. Furthermore, since the number of attachment surfaces of the conduit is limited to four, there is a problem such as inconvenience when the number of wires (pipes) is increased. In order to improve this, a polygonal box body has been devised, but this requires machining of the box body, which is disadvantageous in terms of cost.

Therefore, an object of the present invention is to provide an electric box device in which the method of mounting the conduit can be freely selected and the number of mounting can be easily increased.

Another object of the present invention is to provide an electric box device capable of preventing damage to the electric wire with a simple structure when the electric wire is energized.

[Structure of the Invention] (Means for Solving the Problem) The present invention is directed to a cylindrical box body, a mounting hole opened on a side surface of the box body, and a small diameter from the outside of the box body to the mounting hole. When the small diameter part is inserted and the large diameter part is locked around the mounting hole and the small diameter part is crimped from the inside of the box body, the opening diameter of the small diameter part expands and is fixed to the box body. The shape of the surface that abuts the periphery of most of the mounting holes includes a joint pipe formed so as to be in close contact with the cylindrical curved surface.

Still further, according to the present invention, the cylindrical box has one end in the axial direction having a bottom and the other opening, and the edge of this opening has a tongue for mounting parts protruding to the slamming side of the box at a plurality of positions. A piece is formed, a screw hole is formed in this tongue, and this tongue is deformed toward the bottom of the box as it goes to the center of the box body, and then its tip is curved toward the extension side of the opening. It is a composition that has become.

(Operation) With the above-mentioned means, the shape of the cylindrical body and the contact surface of the joint pipe have been devised, so that the conduit installation direction can be freely selected, and the number of installations can be easily increased. is there. Another object of the present invention is to provide an electric box device capable of preventing the electric wire from being damaged with a simple structure because the tongue piece and the edge of the joint pipe smoothly guide the electric wire when passing the electric wire. And

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Reference numeral 21 denotes a cylindrical main body having an opening in one axial direction (hereinafter referred to as a front opening) and the other end having a bottom, and a conduit opening is provided at an arbitrary position on a side surface of the box main body 21, One end of each of the joint pipes 22, 23, 24 is attached to this opening. Although three openings and the joint pipes 22, 23 and 24 are shown in the drawing, further openings may be provided so that the joint pipes can be pierced into the openings if necessary. In this case, the unused opening is closed by the plug.

FIG. 2 shows a fixed state of the joint pipe 22 and the opening 21a. When one end of the joint pipe 22 on the smaller diameter side is inserted into the opening 21a, the edge on the larger diameter side of the pipe is a peripheral edge portion of the opening 21a. It hits against. The joint pipe 22 is formed by drawing in the radial direction and pressing in the axial direction. The small diameter portion A is formed by drawing, and the large diameter portion B is formed by pressing the drawing tool in the axial direction.

In this case, at the boundary between the small-diameter portion A and the large-diameter portion B, a step portion C that comes into contact with the edge surface of the opening 21a from the outside is generated as shown in the figure. It is formed along the outer peripheral surface of the main body 21.

Here, in order to fix the box body 21 and the joint pipe 22 to each other, the edge of the small-diameter portion A is widened by caulking as shown by the dotted line, and the large-diameter portion A and the widened portion A'are made into the box body. By sandwiching the opening edge of 21, it becomes a fixed state. The end of the conduit tube 30 is inserted into the large-diameter portion B.

FIG. 3 is a view showing the joint pipe 22 taken out. FIG. 3 (a) is a front view and FIGS. 3 (b) and (c) are side views.
In the figures, (b) and (c) are shown with different angles. The step C at the boundary between the large-diameter portion B and the small-diameter portion A is formed so as to come into close contact with the peripheral edge of the opening of the box body.

Returning to FIG. 1, description will be made. A lid is attached to the front opening of the box body 21 of this device. This lid includes a plurality of tongues 41, 42 protruding toward the center from the edge of the front opening.
Can be installed using. The tongues 41, 42 are provided with screw holes, and holes are also formed in the lid portion corresponding to these screw holes.

Here, the tongue pieces 41 and 42 are shaped so that they are deformed toward the bottom side of the box toward the center of the box body 21, and then the tips are curved toward the front opening extension side. The reason for making this shape is that when drawing out the electric wire from the inside of the box,
If the edge of the tongue piece is sharp, the coating of the electric wire may be damaged or the electric wire itself may be cut, which is to prevent this.

Further, in this apparatus, as shown in FIG. 4, the conduit opening is positioned so that the line connecting the fitting pipe mounting position and the tongue position is in the same direction as the axial direction of the box as much as possible. . The reason for doing this is that, as shown by the dashed line in FIG. 4, when the wire 43 is pulled out through the conduit tube and the box body, the widened portion A ′ of the small diameter portion and the tongue piece smoothly guide the wire. This is because we can guide you.

[Effects of the Invention] As described above, according to the present invention, the box main body of the cylindrical accumulator is specified, and the joint pipe has a shape that can be fixed in close contact with the main body. Therefore, the mounting position is not limited. You can freely select the installation direction of the conduit, and the number of installations can be easily expanded. For example, it is extremely advantageous to mount many conduits in the same direction. In addition, the shape of the tongue can prevent damage to the electric wire with a simple structure when the electric wire is passed through. Various materials such as metal and synthetic resin can be selected for the material of the parts of this device, but the effect is remarkable especially in the case of metal.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a view showing a fitting state of a joint pipe, FIG. 3 is a structural explanatory view of the joint pipe, and FIG. 4 is a joint pipe and a tongue piece. FIG. 5 is a diagram showing a positional relationship, FIG. 5 is a perspective view showing a conventional electric box device, and FIG. 6 is a diagram showing a usage state of the conventional electric box device. 21 …… Box body, 22, 23, 24 …… Joint pipe, 41,
42 ... tongue.

Claims (2)

[Claims] 1. A cylindrical box body having one end in the axial direction having a bottom and the other opening, a plurality of mounting holes opened in a side surface of the box body, and the box in each of the mounting holes. The small diameter part is inserted from the outside of the main body and the large diameter part is locked around the mounting hole,
By caulking the small diameter portion from the inside of the box body, the opening diameter of the small diameter portion is expanded and fixed to the box body, and in this state, a joint pipe group in which the inner surface of the opening diameter is a smooth surface, Projecting from multiple points inside the edge of the opening of the box body, each has a screw hole for component attachment, and the tip is curved toward the opening side after being deformed to the bottom side as it goes to the inside of the box body. And a group of tongues having a shape in which the inner surface of the volks body is a smooth surface. 2. The electricity according to claim 1, wherein the positions of the tongues of the tongue group correspond to the smooth surfaces of the tongues so as to be aligned with the positions of the smooth surfaces of the joint pipe. Box device.