JP3128761B2 - Cover for electrical wiring box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for a wiring box, and more particularly, to a cover for an outlet box or a switch box embedded in a concrete layer constituting a wall or a floor of a building or installed in a panel. An electric wiring which is fixed to the electric wiring box so as to close the entire opening of the wiring box, and which is used to fix a switch or an outlet mounting frame (hereinafter referred to as a switch mounting frame) after installation. The present invention relates to a box cover.

[0002]

2. Description of the Related Art In an electric wiring box of this kind,
Depending on the installation location and the like, there are cases where it is desired to make the number of switches and the like attached to the box one and plural, and in order to meet this demand, it is necessary to close the entire opening of the electric wiring box. In addition, the cover fixed to the box needs to adopt a configuration that can cope with a change in the number of switches and the like.

Conventionally, as a means for responding to such a demand, a cover used when the number of mounted switches and the like is one and a cover used when the number of mounted switches and the like are plural are separately manufactured and prepared. In addition, one cover according to the actual number of mounted switches and the like is selected from a plurality of types of covers dedicated for each number of mounted switches and the like. Further, in any of the above-mentioned plural types of covers, an opening having a size corresponding to a mounting frame such as a single switch or a size corresponding to a mounting frame such as a plurality of switches until installation work such as embedding is completed. The opening portion of the cover is closed and the closing plate portion to be removed after the installation is connected and held to the cover body by a plurality of connecting pieces that can be cut at a plurality of locations on the periphery thereof. Was.

[0004]

In the above-mentioned prior art, a plurality of types of covers dedicated to the number of switches and the like must be prepared, so that the total cost is increased. In addition, storage management and bringing in to the construction site are troublesome, and they are liable to be blurred. Further, in the case of a cover for an electric wiring box of a buried specification, a gap is formed between the above-mentioned closing plate portion and a cover body that connects and holds the closing plate portion with a plurality of connecting pieces, and the inside and outside of the electric wiring box are formed. For example, when the present invention is applied to an electric wiring box for burying concrete, there is a possibility that cast concrete may enter the box.

[0005] The present invention has been made in view of the above-described circumstances, and it is possible to easily cope with a change in the number of switches and the like by simply preparing one type. An object of the present invention is to provide a cover for an electric wiring box that can reliably prevent the intrusion of cast concrete even when applied to an electric wiring box.

Another object of the present invention is to provide an opening having a size corresponding to a mounting frame for one switch or the like while saving the material to be used, without causing any damage to the other part. In order to be able to be formed.

Another object of the present invention is to easily attach a cover to an electric wiring box and, when applied to an electric wiring box of a buried specification, to prevent intrusion of cast concrete from the mounting portion. Is to be able to do that.

[0008]

In order to achieve the above object, a cover for an electric wiring box according to the first aspect of the present invention has a bottomed electric wiring box that covers the entire opening of the wiring box. A cover for an electric wiring box fixed so that
A cutting groove for forming an opening having a size corresponding to one switch or outlet mounting frame or an opening having a size corresponding to a plurality of switches or outlet mounting frames is formed. At the periphery of the openings of different sizes selectively formed by cutting along, a switch or outlet mounting frame and screw mounting portions for fixing a plurality of switches or outlet mounting frames respectively are provided. It is characterized by having.

According to the first aspect of the present invention, the cover main body is fixed to the electric wiring box so as to close the opening, and the installation of the cover main body is completed. By simply cutting along the cutting groove formed on the surface of the switch, an opening having a size corresponding to a mounting frame such as one switch or an opening having a size corresponding to a mounting frame such as a plurality of switches is formed. It can be arbitrarily formed, and the mounting frame for one or more switches can be easily formed by using the screw mounting portions provided in the periphery of each of the openings formed in different sizes. It is possible to fix to. Further, since the configuration for forming the openings having different sizes is the cutting groove, even in the case of the electric wiring box of the concrete buried specification, the opening of the box is formed without forming a gap communicating with the inside and outside of the box. It is possible to completely prevent the intrusion of cast concrete by closing the entire area without leakage.

According to a second aspect of the present invention, in the cover for an electric wiring box according to the first aspect of the present invention, the openings having different sizes removed by cutting along the cutting grooves are provided. Reinforcing ribs are integrally formed on the back surface of each cutting plate portion to be formed, and by adopting such a configuration, the thickness of the entire cover body is not increased, and When saving along the cutting groove so as to form an opening having a size corresponding to the mounting frame of one switch or the like, while securing the strength of each cutting plate portion while saving, especially When performing punching and cutting using a hammer or the like, it is possible to cleanly and reliably cut along a predetermined cutting groove without damaging the non-cutting plate side of the cover body.

[0011] Further, according to a third aspect of the present invention, in the cover for an electric wiring box according to the first or second aspect, a back surface of a pair of opposing sides of the cover main body is provided on a wiring box side. Protrusions that protrude are formed, and the protrusions protrude outward from a pair of opposing sides of the peripheral wall on the opening side of the electric wiring box from the inner surface to the outer surface. The engaged portion is formed with an engaged portion that can be elastically engaged with the mating piece. By adopting such a configuration, that is, the engaged portion is elastically engaged with the engaging piece. Just by engaging the cover, the cover body can be easily attached to the electric wiring box, and the engaging portion is blindfolded on the back surface of the cover body to form a blind engagement. Wiring box Even if pouring concrete from the attachment points (engaging portion) there is no fear of invasion.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of the cover for an electric wiring box according to the present invention as viewed from the front side, FIG. 2 is an external perspective view of the cover as viewed from the back side, and FIG.
It is a longitudinal cross-sectional view along the -A line. In each of these figures,
Reference numeral 1 denotes a rectangular cover main body formed of a synthetic resin, and as shown in FIG.
Rectangular cutting groove 4 capable of forming an opening 2 having a size corresponding to a mounting frame (to be described later) of one switch or the like.
Are formed, and the width w of the opening 2 is half of the width W of the opening 2 on each of the left and right sides with the opening 2 as a center.
By connecting the narrow openings 3A, 3A having (= W / 2), as shown in FIG. 8, an opening having a size corresponding to a case where two mounting frames for switches and the like (described later) are juxtaposed. A substantially U-shaped cutting groove 5 capable of forming the portion 3
A and 5A are formed by connecting their both ends to the corners of the rectangular cutting groove 4. That is, the opening 2 or the opening 2 having a different size is formed by cutting along only the rectangular cutting groove 4 and cutting along the cutting groove 4 and the substantially U-shaped cutting grooves 5A and 5A. 3 can be selectively formed.

At a position corresponding to the center of the opening 2 in the width direction of the rectangular annular peripheral plate 1A surrounding the opening 3 in the cover body 1, a mounting frame for a switch or the like is provided in the longitudinal direction of the opening 2. The screw mounting portions 6 and 6 that can be fixed at the opposed positions are formed by projecting in the form of bosses on the rear surface side, and nuts are press-fitted there (not shown) at the site, and the rectangular annular peripheral plate is formed. At the portion corresponding to the connection between the opening 2 and the narrow opening 3A, 3A in the portion 1A, a mounting frame such as two switches and the like arranged side by side is provided with the opening 2, 3A,
Screw mounting portions 7, 7 that can be fixed at the opposed positions in the longitudinal direction of 3A are formed so as to protrude in the form of bosses on the back surface side, and nuts are press-fitted therein (not shown).

Along the back surface of the central cutting plate 8 which is removed by cutting only along the rectangular cutting groove 4 to form the opening 2 and along the substantially U-shaped cutting grooves 5A. The narrow openings 3A, 3A
As shown in FIG. 2, X-shaped reinforcing ribs 8a and 9a,
9a is integrally formed. In addition, each of these cutting plate parts 8
3, 9 are formed thinner than the rectangular annular peripheral plate portion 1A, as shown in FIG.

In the rectangular annular peripheral plate portion 1A of the cover main body 1, a pair of opposite side portions on which the screw mounting portions 6, 6, 7, 7 are formed have a back side. ,
That is, the ridges (projections) 10, 10 protruding toward the electric wiring box described later are integrally formed, and near the both ends of these ridges 10, 10, respectively, from the inner surface to the outer surface, Groove-shaped engaged portions 11, 11 having a depth are formed. These groove-shaped engaged portions 11, 11 are shown in FIG.
As shown in the figure, a square cylindrical peripheral wall 13 of an electric wiring box 12 formed into a rectangular shape with a bottom by a synthetic resin,
The tongue-like engaging pieces 15, 15 protruding outward from a pair of opposing pieces on the opening 14 side of the box 12 are elastically engageable. Thereby, the cover main body 1 can be fixed to the electric wiring box 12 so as to close the entire opening 14 of the box 12. In the drawings, 16... Are screw holes used when it is necessary to firmly fix the cover body 1 to the electric wiring box 12, and are formed in a punching type.

Next, the procedure for embedding the electric wiring box 12 in the concrete layer using the electric wiring box cover having the above-described configuration and installing a switch or the like after the embedding will be described.

As shown in FIG. 4, the electric wiring is achieved by elastically engaging the groove-shaped engaged portions 11 of the cover body 1 with the engaging pieces 15 of the electric wiring box 12. The entire area of the opening 14 of the box 12 is closed by the cover body 1, and as shown in FIG. 5, a closing plate that can be separated from the peripheral wall 13 by applying a pressing force to the peripheral wall 13 of the electric wiring box 12 is applied. The flexible conduit 18 is connected to a selected one of the plurality of wire introduction ports 17 formed by separating the flexible conduit 18.
Through 8, the electric wires are introduced into the electric wiring box 12.

The metal wires 21 and 21 inserted and held between the wire insertion holes 20a formed in the projections 20 provided integrally with the corners of the bottom wall 19 of the electric wiring box 12, respectively. Is fixed to rebars 22, 22 embedded in the concrete layer via fine wires 23, 23 such as wires, and then a concrete formwork 24 is assembled in a state of being pressed and adhered to the cover body 1. The rectangular ring-shaped peripheral plate portion 1A of the cover main body 1 closes the screw mounting portions 6, 6, 7, 7 formed thereon as shown by phantom lines in FIGS. Tapes 29, 29 for preventing concrete intrusion are adhered to the tape.

In the above state, the electric wiring box 12 and the cover body 1 are buried in the concrete layer by casting concrete into the space formed by the concrete formwork 24. At this time, the electric wiring box Since the entire area of the opening 14 is closed by the cover body 1, the cast concrete does not enter the electric wiring box 12 and the box 12
And the cover main body 1 are attached by blind engagement between the engaging pieces 15, 15 and the grooved engaged portions 11, 11 on the back surface side of the cover main body 1. )
There is no danger of casting concrete from entering.

As described above, the electric wiring box 12
And after the cover body 1 is embedded in the concrete layer, the cutter is run along the rectangular cutting groove 4 formed on the surface of the cover body 1 to cut the cutting groove 4, or the cutter is cut. By increasing the depth of the cutting groove 4 by using a hammer, the center cutting plate portion 8 is hit with a hammer to remove the center cutting plate portion 8, thereby mounting one switch or the like as shown in FIG. An opening 2 having a size corresponding to the frame is formed. After that, the opening 2
As shown in FIG. 7, one mounting frame 26 having a switch 25 or the like is applied thereto, and the central screw mounting portions 6, 6 are formed through long grooves 27, 27 formed near the upper and lower ends of the mounting frame 26. Screws 28, 28 are screwed into nuts (not shown) fitted and held on the back of the power supply unit, thereby fixing the mounting frame 26 such as one switch to the electric wiring box 12.

Alternatively, a cutter is run along the rectangular cutting grooves 4 formed on the surface of the cover main body 1 and the substantially U-shaped cutting grooves 5A, 5A on both sides thereof, and the cutting grooves 4A are formed. 5A, 5A, or the depth of the cutting grooves 4, 5A, 5A is increased by a cutter, and the center cutting plate portion 8 and the left and right cutting plate portions 9, 9 are hit with a hammer. These cutting plate parts 8, 9,
By removing 9, as shown in FIG. 8, an opening 3 having a size corresponding to a case where two mounting frames such as switches are juxtaposed is formed. After that, as shown in FIG.
6 are applied in a juxtaposed state, and nuts (shown in the figure) which are fitted and held on the backs of the screw mounting portions 7 on the left and right sides through long grooves 27 formed near the upper and lower ends of each mounting frame 26. Screws 28, 28 are screwed into the (omitted), so that the mounting frames 26, 26, such as two switches, are fixed side by side with respect to the electric wiring box 12.

As described above, only by preparing one type of cover, the cutting along only the rectangular cutting groove 4 formed on the surface of the cover body 1 and the cutting groove 4 and the substantially By selecting the cutting along the U-shaped cutting grooves 5A, 5A after embedding in the concrete layer, openings 2 or 3 having different sizes are selectively formed as shown in FIGS. Thus, it is possible to arbitrarily obtain the state shown in FIG. 7 in which the mounting frame 26 such as one switch is fixed, and the state shown in FIG. 9 in which the mounting frame 26 such as two switches is fixed. In any case, no gap is formed in the cover main body 1 inside and outside the electric wiring box 12, and the box 1
The entire area of the opening 14 can be closed and maintained without leakage, so that the intrusion of cast concrete can be reliably prevented.

Each of the cutting plate portions 8 and 9, 9 is provided with reinforcing ribs 8a, 9a,
9a, the central cutting plate 8 is punched and cut with a hammer or the like to form an opening 2 having a size corresponding to the mounting frame 26 of one switch or the like. The impact force of the non-cutting plate portions 9, 9
, And the non-cutting plate portions 9 and 9 are not broken, and the cutting groove 4 is not jerky, and it is possible to cut cleanly and reliably along the predetermined cutting groove 4. .

In the above embodiment, the case where one mounting frame 26 such as a switch or the like and the case where two mounting frames 26 are juxtaposed can be selected has been described. However, the cutting grooves 5A on both sides are provided. If the width is equal to the width of the central rectangular cutting groove 4, it is possible to select to mount the three mounting frames 26 side by side, and furthermore, by considering the form of such a cutting groove. It is also possible to select four or more mounting frames 26 side by side.

In the above embodiment, the electric wiring box 12 is buried in the concrete layer. However, the present invention can be applied to a cover for an electric wiring box arranged in a panel. In this case, as shown in FIG. 10, the point different from the case of embedding in the concrete is that the insertion holes 20a. After the support members 21A, 21A are inserted, both ends of the upper and lower support members 21A, 21A are attached to columns (not shown) on the side of the panel plate 24A, and the cover body 1 is attached to the electric wiring box before and after the attachment. 12, the electric wiring box 12 with the cover body 1 attached is attached to the front and rear panel boards 24A (only one panel board is shown in the figure).
The tapes 29A, 29A for closing the screw mounting portions 6, 6, 7, 7 are made of metal tape so that they can be detected by a metal detector or the like. The cutting groove 4 or the cutting grooves 5A, 5A is cut by detecting a metal tape 29A, 29A of the cover main body 1 from outside the panel plate 24A with a metal detector or the like, where the electric wiring box 12 is located in the panel. Then, the process is performed after opening an opening of a predetermined size in the panel plate 24A, and the other operations are the same as the case of embedding in the concrete.

[0026]

As described above, according to the first aspect of the present invention, after the installation work such as embedding is completed, only the cutting operation along the cutting groove formed on the surface of the cover body is performed. Thus, it is possible to arbitrarily select a state in which the mounting frame such as one switch is fixed and a state in which the mounting frames such as a plurality of switches are fixed. Therefore, by preparing only one type of cover, it is possible to easily respond to the change in the number of switches, etc., and to achieve total cost reduction, as well as storage management and bringing it to the construction site. Can also be done easily. In addition, when the present invention is applied to an electric wiring box of a concrete buried specification, the entire area of the opening of the box is closed without leakage without forming a gap communicating with the inside and outside of the box, thereby reliably preventing the penetration of the poured concrete. It has the effect of being able to do so.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the thickness of the entire cover body is not increased, and the material used is reduced.
Since the strength of each cutting plate portion can be secured sufficiently large, when cutting along a cutting groove for forming an opening having a size corresponding to a mounting frame of one switch, particularly using a hammer or the like. When punching and cutting, the cover body can be cut cleanly and securely along a predetermined cutting groove without damaging the non-cutting plate side of the cover body.

Further, according to the third aspect of the present invention,
In addition to the effects of the first or second aspect of the present invention, the cover body can be easily attached to the electric wiring box, and the mounting portions of both cover the blind engagement on the back surface of the cover body. Therefore, in the case of burying concrete, it is possible to prevent the intrusion of the cast concrete from the mounting location (engaging location).

[Brief description of the drawings]

FIG. 1 is an external perspective view of a cover for an electric wiring box according to the present invention as viewed from the front side.

FIG. 2 is an external perspective view of the electric wiring box cover as viewed from the back side.

FIG. 3 is a longitudinal sectional view taken along line AA of FIG. 2;

FIG. 4 is a longitudinal sectional view taken along line BB of FIG. 1 in a state where the cover is attached to an electric wiring box.

FIG. 5 is a perspective view showing a state where the electric wiring box is attached to a reinforcing bar.

FIG. 6 is a front view showing a state in which an opening having a size corresponding to a mounting frame of one switch or the like is formed.

FIG. 7 is a front view showing a state in which a mounting frame such as a switch is fixed to the opening of the same.

FIG. 8 is a front view showing a state in which an opening having a size corresponding to a mounting frame of two switches or the like is formed.

FIG. 9 is a front view of a state in which mounting frames such as two switches are fixed side by side in the opening.

FIG. 10 is a perspective view showing a state where an electric wiring box to which a cover main body is attached is disposed in a panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover main body 2, 3 Opening part 4 Rectangular cutting groove 5A Substantially U-shaped cutting groove 6, 7 Screw mounting part 8, 9 Cutting plate part 8a, 9a Reinforcement rib 10 Protrusion part (projection part) 11 Engaged part 12 Electric wiring box 13 Peripheral wall of box 14 Opening of box 15 Engagement piece 26 Mounting frame for switch etc.

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI H02G 3/08 H02G 3/08 M (56) References JP-A-60-16108 (JP, A) JP-A-61-128715 ( JP, A) JP-A-7-274348 (JP, A) JP-A-4-36736 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 3/02 B60R 16/02 F16B 5/02 H02G 3/08

Claims (3)

(57) [Claims] 1. A cover for an electric wiring box fixed to an electric wiring box with a bottom so as to close the entire opening of the wiring box, wherein one switch or outlet is attached to at least a surface of the cover body. A cutting groove for forming an opening having a size corresponding to the frame or an opening having a size corresponding to a plurality of switch or outlet mounting frames is formed, and is selected by cutting along the cutting groove. Around the openings formed differently in size, there are provided one switch or outlet mounting frame and screw mounting portions for fixing a plurality of switches or outlet mounting frames, respectively. Cover for electrical wiring box. 2. A reinforcing rib is integrally formed on the back surface of each cutting plate portion which is removed by cutting along the cutting groove to form openings of different sizes. Item 2. An electric wiring box cover according to item 1. 3. A projection projecting toward the wiring box is formed on the back side of the pair of opposing sides of the cover body, and the projections are formed on the projection from the inner surface to the outer surface. An engaging portion elastically engageable with an engaging piece protruding outward from a pair of opposing side portions of the peripheral wall on the opening side of the wiring box is formed. Item 1
Or the cover for an electric wiring box according to 2.