JPH0448093Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an electrical box used for indoor wiring of lighting switches, etc.
The present invention relates to a device for preventing foreign matter from entering a screw hole, which is used to prevent foreign matter, particularly concrete, from entering a screw hole for installing an electrical component.

(Prior Art) Electrical boxes that have been buried in concrete walls of buildings have been made of synthetic resin.

FIG. 2 shows such an electrical box, in which the box body 10 is formed with an opening 10a. An opening 11 for connecting piping is provided in the side wall of this opening 10a. In addition, opening 1
An electrical component attachment 12 to which an electrical component such as a lighting switch is attached is formed at 0a, and a metal screw hole member 13 having a screw hole is fitted into this electric component attachment portion 12. Then, as shown in FIG. 3, for example, the box main body 10 is positioned and installed using a fixing device (not shown) with its opening side facing the architectural panel 14 at the designed position in the building. I can't. At this time, the box body 10 opens its opening 11
is detached, and the electrical conduit 15 is connected to the detached portion using a lock nut 16 and a bushing 17. Thereafter, concrete 18 is poured into the building panel 14, and the concrete 18 is hardened. And the architectural panel is arrow A
When the box main body 10 is removed in the direction shown in FIG. Electrical components 19 are screwed and attached.

By the way, when such an electrical box is buried in concrete 18, the poured concrete 18 enters the hole of the screw hole member 13 of the electrical component mounting part 12 in the opening 10a, and the concrete 18 is buried. Once solidified, it becomes impossible to remove the concrete 18 and it becomes difficult to attach the electrical components 19 after burying. Therefore, conventionally, a measure has been taken to prevent the concrete 18 from entering by pasting tape onto the screw hole member 13 to close it.

However, with the concrete intrusion prevention means for the screw hole member 13, it is necessary to apply tape each time, and then remove the tape and attach the electrical component 19. Therefore, the curing work is very troublesome and the work is difficult. This has the problem of increasing the number of man-hours. Moreover, according to this, if the tape is not securely attached to the screw hole member 13,
There is a risk that the concrete 18 will invade, resulting in a problem of poor reliability.

(Problems to be Solved by the Invention) As described above, the conventional means for preventing concrete intrusion has the problem that the work is very troublesome and requires a large number of man-hours.

This idea was made in view of the above circumstances, and it is possible to simplify the structure and simplify the workability.
Another object of the present invention is to provide a device for preventing the intrusion of foreign matter into a screw hole of an electrical box, which can reliably prevent the intrusion of concrete and the like.

[Structure of the invention] (Means for solving the problem) This invention has a box body which has a screw hole for installing electrical parts in the opening and accommodates an electric wire buried in concrete, and a The first and second parts are respectively fitted to both ends of the screw hole.
and a foreign matter intrusion prevention member whose fitting part is integrally molded with resin through an elastic part to constitute a screw hole foreign matter intrusion prevention device for an electrical box.

(Function) According to the above configuration, the screw hole of the box body is
When buried in a concrete wall, the first and second fitting parts of the concrete intrusion prevention member are infiltrated and closed at both ends, and when electrical components are installed, the first and second fitting parts are separated and electrical Parts are installed. Therefore, it is possible to reliably prevent concrete from entering the screw hole of the box body by simply attaching and removing the concrete intrusion prevention member, improving reliability as much as possible compared to the past. I can figure it out.

(Embodiments) Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 1 shows a foreign matter intrusion prevention member 20 which is a main part of a screw hole concrete intrusion prevention device for electrical boxes according to an embodiment of this invention, and is integrally molded from a synthetic resin such as polyethylene. That is, in the figure, reference numerals 21 and 22 denote first and second fitting portions, which are formed to correspond to the hole diameter of the screw hole member 13. Flange portions 21a and 22a are formed at the bases of these first and second fitting portions 21 and 22, and these collar portions 21a and 22a are connected via an elastic portion 23. And this collar part 21a, 2
A detachment tongue piece 24 is formed on one of the two parts 2a, which corresponds to the first fitting part 21, for example.

Foreign matter intrusion prevention member 20 configured as described above
The first and second fitting parts 21 and 22 are respectively inserted and fitted from both ends of the hole of the screw hole member 13 of the electrical component mounting part 12 of the box body 10. At this time, the flanges 21a and 22a of the first and second fitting parts 21 and 22 cover and protect both ends of the electrical component mounting part 12. Thereby, when the box body 10 is buried in the concrete 18 as described above, the concrete 18 is reliably prevented from entering the screw hole member 13.

Further, the foreign matter intrusion prevention member 20 fitted and attached to the screw hole member 13 is attached to the concrete 18.
When the box body 10 is solidified and the embedding of the box body 10 is completed, the first fitting part 21 is removed from the screw hole member 13 by holding the tongue piece 24 in the hand, and then the second fitting part 22 is removed. is detached from the screw hole member 13 and removed. Here, an electrical component 19 is attached to the opening 10a of the box body 10 by being screwed into the screw hole member 13 thereof.

As described above, the screw hole foreign matter intrusion prevention device for the electrical box has the first and second fitting parts 21 which are removably fitted into each other from both ends of the hole of the screw hole member 13 of the box main body 10. 22 as elastic part 2
A foreign matter intrusion prevention member 20 integrally molded with resin through the screw hole member 13 is provided, and the foreign matter intrusion prevention member 20 is configured to prevent concrete 18 from entering into the hole of the screw hole member 13, thereby preventing foreign matter intrusion. First and second fitting portions 21 and 22 of prevention member 20
Intrusion of the concrete 18 can be reliably prevented by a simple operation of attaching and detaching it to the hole of the screw hole member 13 of the box body 10.

In the above embodiment, the box body 10 made of resin is used, and the metal screw hole member 13 is fitted into the electrical component mounting portion 12. It can also be applied to metal box bodies with screw holes for attaching parts.

Further, in the above embodiment, the detachment tongue piece 24 is provided at one location, but the detachment tongue piece 24 is not limited to this, and the detachment tongue piece 24 may be provided in correspondence with both the first and second fitting portions 21 and 22. It is also possible to provide one.

Therefore, this invention is not limited to the above embodiments, but may be applied to other embodiments. Of course, various modifications can be made without departing from the gist of the invention.

[Effects of the invention] As detailed above, according to this invention, an electrical system that has a simple structure, facilitates workability, and reliably prevents the intrusion of concrete, etc. It is possible to provide a device for preventing foreign matter from entering a screw hole of a box.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a screw hole concrete intrusion prevention device for an electrical box according to an embodiment of this invention, FIG. 2 is a perspective view showing an electrical box to which this invention is applied, and FIG. This figure is an exploded view showing the installation state of the electrical box shown in FIG. 2. 10... Box body, 11... Closing member, 1
2... Electrical component mounting part, 13... Screw hole member,
14... Building panel, 15... Electric conduit, 16...
Lock nut, 17... Bushing, 18... Concrete, 19... Electrical component, 20 ... Foreign matter intrusion prevention member, 21, 22... First and second fitting portion, 21a, 22a... Flange portion, 23 ...elastic part,
24... Tongue piece.

Claims (1)

[Scope of claim for utility model registration] The opening has a screw hole for installing electrical components,
A box body in which electric wires buried in concrete are accommodated, and first and second fitting parts that are respectively fitted to both ends of the screw hole of this box body are integrally molded with resin through an elastic part. 1. A screw hole foreign matter intrusion prevention device for an electrical box, characterized by comprising a foreign matter intrusion prevention member.