JPH01321807A - Electrical box structure - Google Patents

Abstract

PURPOSE:To set the depth of a box freely by laminating a bias having same shape as the side face of the box on the open section of the box and engaging the pawl section of the bias with a plurality of fixing tongues arranged at the open side of the bottomed electrical box. CONSTITUTION:A plurality of punched sections 10a for piping are made through the surrounding wall of a rectangular bottomed electrical box 100 and the depth thereof is set to W1. Threaded fixing tongues 102 are fixed in the central sections of the short sides at the open face. Then a bias 200 having same shape as the side wall of the box 100 and open opposite faces is formed. The depth thereof is set to W3(<W1), and an engaged section 212, an engaging/engaged section 210, a pawl section 211 and a hole 213 are formed at the position corresponding to the tongue chip 102 in the central section of the short side. A plurality of biases 200, 300 are laminated on the box 100 corresponding to the thickness of the wall and a screw is screwed to the tongue chip 102 through a hole made in a decoration board (not shown). By such arrangement, the depth of the electrical box can be set freely with two types of part.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention is intended for use in indoor wiring draw-outs and electric appliances (lights, switches, etc.) that are buried in walls of buildings, concrete panels, etc. The installation relates to an electrical box structure used as a part.

(Prior Art) Conventionally, as shown in FIG. 5, an electrical box is buried in concrete 13 and used for indoor wiring, etc. For example, an example of a concrete panel will be explained from the manufacturing process as follows. First, as shown in FIG. 5(a), the electrical box 11 is placed in a formwork 12 with its opening facing down, and the end of the electrical conduit 14 is attached to the side wall of the electrical box 11. After assembling in this way, formwork 12
Concrete 13 is placed so as to bury the conduit 14 and electrical box 11 inside.

When the concrete 13 hardens, the formwork 14 is removed,
As shown in FIG. 2B, the opening of the electrical box 11 is exposed to the wall surface of the concrete 13. Conduit 1
If the electric wires routed through 4 are connected to a switch, for example, in this electrical box 11, switch components are arranged in the space inside the box. Further, the opening is closed by a decorative plate 16 that allows the operator to be exposed to the outside.

The switch parts and the decorative board 16 are attached using a plurality of tongue pieces 15 formed protruding inward near the opening of the electrical box 11. For attachment, a screw hole is formed in the tongue piece 15, and the decorative plate 16 is fixed by passing a screw 17 through the decorative plate 16 and tightening it.

(Problems to be Solved by the Invention) The conventional electrical box 11 described above has its depth Wl fixed in advance. For this purpose concrete 1
Depending on the thickness W2 of the electrical box 11, the position of the electrical conduit 14 may not necessarily fit the mounting area of the electrical box 11 as shown in the figure.

Therefore, if electrical boxes of different depths are prepared depending on the thickness of the concrete panel, many types of electrical boxes would have to be manufactured, which would undermine the advantage of mass production.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrical box structure in which the depth of the electrical box can be freely adjusted and the adjustment work is simple.

[Structure of the Invention] (Means for Solving the Problems) The present invention has a box body that is buried in concrete with an opening formed on one side and the opening facing the concrete wall surface, In an electrical box structure, a frame body that can be stacked on the opening, and a mounting tongue piece that protrudes into the box body and serves to close the opening with a lid are provided on the inner side surface near the opening, and the frame body a first bias member that is in contact with an inner wall of the first bias member and has an engaging portion and an engaged portion formed at a position corresponding to the tongue piece, and the opening of the first bias member With the edge aligned with the opening of the box main body, the engagement portion is engaged with the tongue piece, and with a similar second bias member laminated on the first bias member, The engaging portion of the second bias member can be locked to the engaged portion of the first bias member.

(Function) With the above means, the depth of the electrical box body can be freely adjusted using the bias member, and
Alternatively, even after the concrete panel is manufactured, the bias member can compensate for the difference in level between the box opening and the wall plate surface that occurs when a heat insulating material or wall plate is placed on the panel surface.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which an electrical box main body 100 is made of metal or synthetic resin, for example, and shaped into a box shape with a bottom, and has an opening 101. As shown in FIG. A plurality of punched portions 10a for attaching electric conduit P can be provided on the side wall. This punched portion 10a can be formed, for example, by providing a notch in a shape that leaves a part of a circular shape, and then removing the circular portion when necessary.

A plurality of tongue pieces 102 are attached to the inner wall near the opening 101.
is provided prominently. For this attachment, a screw hole is formed in the tongue piece 102, and is used, for example, when closing an opening with a lid and tightening the lid with a screw.

The depth Wl of the electrical box 100 can be freely extended as necessary. 200 is a bias member for this purpose. The bias member 200 has the opening 10
1, and an engaging portion and an engaged portion 210 that are integrally formed in abutting contact with the inner wall of the frame body 201.

A plurality of engaging parts and engaged parts 210 are formed in correspondence with the tongue pieces 102 for attachment. The engaging portion and the engaged portion 210 are such that the bias member 200 is connected to the opening 1 of the electrical box 100.
01, the corresponding mounting has a claw part 211.211 that locks on the tongue, and this claw part 211,
The engaged portion 212 is shaped toward the opposite side from the engaged portion 211 . Further, in the thick portions of the engaging portion and the engaged portion 210, corresponding mounting holes 213 coaxial with the screw holes of the tongue piece 102 are provided.
is formed. In the drawing, only one of the engaging portions and the engaged portions is shown as a whole, but the engaging portions and the engaged portions corresponding to the tongues of each attachment are formed in the same shape.

The bias member 200 as described above is attached to the electrical box 10.
If installed in the opening of 0, the depth W of the electrical box 100
l can be further extended by the width W3 of the frame body 201. If the depth is to be further extended, this can be done by attaching a second bias member 300 having a similar configuration to the bias member 200 in an overlapping manner. The second bias member 300 is also attached to the engaging portion and the engaged portion 31 at a location corresponding to the tongue piece 102.
has 0. The engaging portion and the engaged portion 310 also have a claw portion 311 .
311, an engaged portion 312, and a hole 312.

FIG. 2 shows an engaging portion of the electrical box 100 described above when bias members 200 and 300 are stacked. In this way, the bias member 200
, 300 are stacked one after another, the upper engaging part locks with the lower engaged part, and the depth of the box can be adjusted, but this work requires attaching the bias member with one touch. I can do it. This is because the bias member is made of synthetic resin and its claws have a certain degree of elasticity. In addition, when the engaged part or the attachment is engaged with the claw part on the tongue piece, the pair of opposing claw parts acts to be pushed apart when installed, and returns to the predetermined position by elastic force. The engaging portion or attachment is engaged so as to sandwich the tongue piece.

In this state, the attachment is designed such that the screw hole of the tongue piece 102 and the holes of each engaging part and engaged part are aligned in a straight line. Therefore, when the opening of the bias member (for example, 300) is closed with a lid, the screws 120 are attached to the screw holes of the tongue piece 102 through the holes of each engaging portion and the engaged portion. In this case, the engaged portions 312 are formed at positions spaced apart from each other so as not to protrude from the frame body.

Here, the connection form between the electrical box 100 and the edge of the bias member 200 or the edge of the bias members 200 and 300 is, for example, an L-shaped step or a tabular shape as shown in FIG. 2(b) or (C). It is preferable to use surface joining to prevent liquid from entering from the outside.

According to the electrical box structure described above, if the thickness of the concrete 13 changes and the depth Wl of the electrical box 100 becomes insufficient as shown in FIG.
If the insulation material 400 or the ceiling board 500 is pasted on after the insulation material 400 or the ceiling board 500 has been created (particularly for the ceiling, etc.), the depth of the electrical box 100 may be insufficient, so it is a simple task.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain an electrical box structure in which the depth of the electrical box can be freely adjusted and the adjustment work is simple.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, and FIG. 2 is a partially assembled view of the structure shown in FIG. b) and (c) are sectional views, respectively, FIGS. 3 and 4 are views showing an example of the use of the electrical box structure of the present invention, and FIG. 5 is a sectional view showing an example of the use of a conventional electrical box. Figure (a)
Figure (b) shows the manufacturing stages of concrete panels.
is a diagram showing the usage condition of the concrete panel. DESCRIPTION OF SYMBOLS 100... Electrical box, 102... Tongue piece for mounting, 200.300... Bias member, 201... Frame body, 210.310... Engaging part and engaged part, 21
]...Claw portion, 212...Engaged portion, 213...Hole. Applicant's representative Patent attorney Takehiko Suzue District 2, Figure 3, Figure 4 (b)

Claims (1)

[Scope of Claims] A box body is provided with an opening on one side and is buried in the concrete with the opening facing the concrete wall surface, and an inner side surface near the opening is provided inside the box body. An electrical box structure is provided with a mounting tongue that protrudes from the opening and serves to close the opening with a lid, comprising: a frame body that can be stacked on the opening; comprising a first bias member having an engaging part and an engaged part formed at corresponding positions, and with the opening edge of the first bias member aligned with the opening of the box main body, When the engaging portion is engaged with the mounting tongue and a similar second bias member is stacked on the first bias member, the engaging portion of the second bias member is engaged with the first bias member. An electrical box structure capable of being locked to the engaged portion of a member.