JPH05217624A - Dustproof cover of wiring device - Google Patents

Abstract

PURPOSE:To prevent infiltration of dirt and dust from a plug edge insert hole of an unused connection part. CONSTITUTION:A wiring device A is equipped with a connection part 2c where a harness plug is connected. At this connection part 2c, a transverse groove 8 is provided where a locking piece of the harness plug is detained. A dust protective cover 11 is made in box form whose one surface to be fitted on the front extremity of the connection part 2c is left open. A detaining piece to be engaged by the transverse groove 8 is formed on one side wall 11b of the dust protective cover 11. This cover 11 is made easy to be mounted on the connection part 2c by fitting of the detaining piece in the groove 8, preventing infiltration of dirt and dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof structure for a wiring device having a connecting portion to which a harness plug is connected.

[0002]

2. Description of the Related Art In recent indoor wiring systems, it has been proposed to use a plurality of wiring devices called joint boxes for branching a plurality of power supply lines so that indoor wiring can be freely performed according to the indoor layout. .. In this indoor wiring system, in order to securely and easily connect the branch cable and the wiring device, a harness plug is attached to the branch cable side, and a connection portion to which the harness plug is connected is provided on the wiring device side. The connection allows the branch cable to be connected to the wiring device.

[0003]

However, the indoor wiring as described above is generally performed in an environment such as a ceiling or an underfloor where there is a lot of dust and dust, and unused connection parts are left as they are. Then, there is a possibility that dust or dirt may enter the inside from the blade insertion port into which the blade of the harness plug formed in the connection portion is inserted, resulting in poor electrical conductivity or inability to mount the harness plug.

The present invention has been made in view of the above points, and an object of the present invention is to provide a wiring capable of preventing dust and dirt from entering the inside from a blade insertion opening of an unused connection portion. It is to provide a dustproof cover for the device.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a connecting portion for connecting a harness plug, and engages and disengages with a locking portion on the side of the harness plug to prevent the harness plug from coming off. A dust-proof cover used for a wiring device in which a locked portion for prevention is formed in the connection portion, the dust-proof cover being attached to the connection portion so as to cover at least a front surface in which the blade insertion slot is formed, (EN) Provided is a dustproof cover for a wiring device, which includes a locking piece that is locked to a stop portion and that is prevented from coming off from a connection portion.

In order to reliably prevent the intrusion of dust and dirt, it is preferable to form a rib surrounding the blade insertion opening on the surface covering the blade insertion opening.

[0007]

According to the present invention, as described above, at least the plug blade insertion opening of the connecting portion for connecting the harness plug of the wiring device is covered with the dustproof cover to prevent dust and dirt from entering from the blade insertion opening. To prevent. In addition, a locking piece that locks to the locked portion provided to prevent the harness plug from coming off the wiring device is provided to facilitate the attachment of the dustproof cover to the connecting portion.

[0008]

1 to 9 show an embodiment of the present invention. FIG. 6 shows an example of a wiring device to which the present invention is applied. This wiring device A includes two connecting portions 2 for connecting power cables from both end surfaces of a housing 1 made of synthetic resin or the like.
Projections a to 2c are provided. Inside the wiring device A, an internal circuit shown on the upper surface of the housing 1 shown in FIG. 7 is formed by using a conductive plate, and inside each of the connecting portions 2a to 2c, there is an electric connection with each power cable. A structural member (which may be integrated with a conductive plate) for making a physical connection is built in. A mounting hole 3 is formed in the center of the housing 1, and the housing 1 is fixed to a structural material such as an underfloor or a ceiling by using the mounting hole 3.

In this wiring device A, the main case is connected to the connecting portion 2a.
Table L₀Is connected, and the cable for the feed wiring is connected to the connecting portion 2b.
Bull L₁However, the branch cable L is connected to the connecting portion 2c.₂But
Are connected (see FIG. 2 or FIG. 8). Connection part 2a, 2
The cable L is a so-called quick-connect type for each b₀, L₁Connected
To be done. Here, the quick-connect type means a power cable L₀, L ₂
Insert the core wire of the wire into the front surface of the connecting portion 2a, 2b
When inserted into the hole 4, the terminal board and the lock
Power cable L by elastically sandwiching the core wire with ₀, L₁
Is a well-known method of electrically connecting to an internal circuit. Na
By locking the locking piece of the locking spring to the core wire,
The electric wire insertion hole 4 is prevented from coming off, and the connecting portions 2a, 2b
From the release window 5 formed at the base end of the tool such as a screwdriver
Operate the internal release button using the
When the mechanical holding force is released, the power cable L₀, L₁To
It can be removed.

The connecting portion 2c has a so-called harness connecting structure for connecting the harness plug 6 attached to the branch cable L ₂ . By the way, the harness plug 6 has a conventionally well-known structure, and a concave portion for mounting on the harness connector is formed in the front end portion.
A book stopper blade is provided, and a lock piece 7 for fixing the connected state with the harness connector is provided on the upper surface as shown in FIG. 7 or 8. The lock piece 7 protrudes into the recess, and is locked in a lock groove formed in the harness connector at the time of mounting to prevent the lock piece 7 from being detached from the harness connector. In addition, when the base end of the lock piece 7 is pressed to rotate the tip end portion upward, the engagement state with the engagement groove of the lock piece 7 is released, and the lock piece 7 can be detached from the harness connector. There is.

As shown in FIG. 6, the connecting portion 2c of the wiring device A of this embodiment has substantially the same structure as the fitting portion of the known harness connector with the harness plug.
The blades of the harness plug 6 are inserted into the three blade insertion openings 10 formed on the front surface of c, and the blades are received by the blade receiving springs arranged inside the connecting portion 2c, and are passed through the internal circuit. The branch cable L ₂ is connected to the power supply line. In addition, in the connection portion 2c of the present embodiment, the front surface on which the blade insertion opening 10 is formed is recessed except for the outer peripheral portion. A lateral groove 8 (corresponding to the locking groove of the harness connector) in which the lock piece 7 of the harness plug 6 is locked is formed on the upper surface of the connecting portion 2c in order to fix the mounted state of the harness plug 6. I am doing it. In addition, the lateral groove 8 in the connecting portion 2c
The vertical grooves 9 formed vertically on both sides of the harness plug 6 are grooves into which the protrusions formed inside the concave portion of the harness plug 6 are fitted. Is to be connected, and only the harness plug 6 in which the vertical groove 9 and the protrusion are formed at the same position can be connected to prevent the reverse insertion or the connection of different harness plugs 6.

An example will be described in which the wiring device A is used to perform underfloor wiring on a so-called free access floor. As shown in FIG. 9, this free access floor is provided with a wiring space between the underfloor slab G and the floor F in a tenant building or the like for routing the power cables L _{0 to} L _2, and wiring under the floor is performed using this wiring space. It is made possible to do. In this underfloor wiring system using a free access floor, a plurality of outlets C are buried in the floor, and a plurality of outlets H and I are arranged on the floor.
A harness plug 6 is attached to the tip of each branch cable L ₂ connected to each of the outlets C, H, and I, and a plurality of wiring devices A freely branch the power supply line as needed, and a wiring device according to a layout change. It is possible to easily move or add more. The branch cable L ₂ connected to the outlets H and I is pulled under the floor by the demarcation box D. In addition, the power cable L ₀ to the wiring device A
The state after connection of L ₂ is shown in FIG.

Next, the dustproof cover 1 which is a feature of this embodiment
1 will be described. The dustproof cover 11 is connected to the connecting portion 2c.
It is used when the branch cable L ₂ is not connected to the branch cable L ₂ and prevents entry of dust and dirt from the blade insertion opening 10. This dustproof cover 11 is shown in FIGS.
As shown in FIG. 3, one side is formed of a synthetic resin in a box shape having an opening, and the opening side is attached to the front surface of the connecting portion 2c. The side wall portion 11b, which corresponds to the upper surface of the connection portion 2c of the dust cover 11, is separated from the other side wall portions, and the side wall portion 11b is separated.
As shown in FIG. 4B, the wedge-shaped locking piece 12 is formed on the inner surface of the
Has been formed. Therefore, when the dustproof cover 11 is attached to the connecting portion 2c, the locking piece 12 is locked in the lateral groove 8 to prevent the dustproof cover 11 from coming off. Further, a tripping piece 13 is formed on the outer surface of the front end portion of the side wall portion 11b so that a finger can be put on the dustproof cover 11 when detaching it from the connecting portion 2c. That is, the dustproof cover 11 is attached to the lateral groove 8 of the connecting portion 2c.
As a so-called snap-in method that is elastically locked to and attached to, secure and easy attachment / detachment is possible without using tools. A rib 14 surrounding the blade insertion opening 10 of the connecting portion 2c is formed on the surface of the front wall portion 11a of the dust cover 11 that faces the blade insertion opening 10. The rib 14 prevents the entry of dust and dust. The structure is double-layered, and surely prevents dust and dirt from entering from the blade insertion port 10. Furthermore, a rib 15 higher than the rib 14 is formed from the center of the rib 14 corresponding to the blade insertion slot 10 formed in the center of the connecting portion 2c, and the dustproof cover 11 is attached to the connecting portion 2c.
The rib 15 has a structure that fits into the blade insertion opening 10 when mounted on c, and the rib 15 also has a function of fixing the attachment state of the dustproof cover 11 to the connecting portion 2c.

By the way, when the locking piece 12 is formed from the inside of the side wall portion 11b as described above, the dustproof cover 11 is usually manufactured by a mold using a slide core. However, such a mold has a cost problem.
Therefore, in this embodiment, as shown in FIGS. 1 and 4B, the slide core is not required by forming the mold hole 16 in the upper portion of the front wall portion 11a. In other words, the slide core is not required because the locking piece 12 can be formed by fitting the mold through the hole 16 and the other mold from the left and right in FIG. 4B.

In the case of this embodiment, the case where the branch cable L ₂ having a ground electrode is connected has been described as an example. However, other parts such as the connecting portion 2c for connecting the power cable L ₂ having no ground electrode are used. The present invention can be applied to a connection portion having a structure. That is, the present invention can be applied to any connection part having a structure in which the harness plug 6 is connected and the locking piece 7 of the harness plug 6 is locked.

[0016]

As described above, the present invention is provided with the connecting portion for connecting the harness plug, and the locked portion for preventing the harness plug from coming off by engaging with the locking portion on the harness plug side is provided. A dust-proof cover used for a wiring device formed in a connection part, the cover being attached to the connection part so as to cover at least a front surface on which a blade insertion port is formed, and being locked to the locked part. It is equipped with a locking piece that prevents it from coming off from the plug blade insertion port by covering at least the blade insertion port of the wiring device harness plug connection part with a dustproof cover. Since there is a locking piece that locks to the locked part that is provided to prevent the entry of dust and to prevent the harness plug from coming off the wiring device, attach the dust cover to the connection part. Will be easier.

Further, when a rib surrounding the blade insertion opening is formed on the surface covering the blade insertion opening, the entire blade cover and the rib cover the blade insertion opening doubly to prevent dust and dirt. Intrusion can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a wiring device and a dust cover according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a mounting state of the dustproof cover on the wiring device.

FIG. 3 is a perspective view showing a structure on the back side of the dustproof cover.

4A to 4D are a plan view, a side sectional view, a front sectional view and a bottom view of a dustproof cover.

5 is an enlarged cross-sectional view of a main part in FIG. 4 (a).

FIG. 6 is a perspective view of a wiring device.

FIG. 7 is a plan view showing a wiring device and a harness plug for connecting a branch cable to the wiring device.

FIG. 8 is a partial perspective view showing a connection state of a cable to a wiring device.

FIG. 9 is an explanatory diagram of an underfloor wiring system using the above wiring device.

[Explanation of symbols]

A Wiring device L _{0 to} L ₂ Power cable 2c Connection part 6 Harness plug 7 Lock piece 8 Lateral groove 10 Plug blade insertion opening 11 Dust cover 12 Locking piece 14 Rib

Claims (2)

[Claims] 1. A wiring device comprising a connecting portion for connecting a harness plug, and a locked portion for preventing detachment of the harness plug by engaging with a locking portion on the harness plug side in a concavo-convex manner. A dust-proof cover used for, which is attached to the connecting portion so as to cover at least the front surface on which the blade insertion slot is formed, and which is locked to the locked portion to prevent disengagement from the connecting portion. Dust-proof cover for wiring device with one piece. 2. The dustproof cover for a wiring device according to claim 1, wherein a rib surrounding the blade insertion opening is formed on a surface covering the blade insertion opening.