JPH07143643A - Sound leakage prevention plug of electrical piping - Google Patents

Abstract

PURPOSE:To provide a leakage sound prevention plug which positively closes the space of a piping joint part with a simple operation, does not produce any space even if electric wire is moved after closing the space, has a simple inspection control and can be handled easily, does not contaminate the surrounding, and has an improved sound-shielding effect. CONSTITUTION:An electrical piping 1a is interlocked by a connector 4 for branching a required electric wire 3 via a joint box 2. A sound leakage prevention plug 5 is mounted to the electric wire 3 and is fitted while being pushed into the connector 4. The sound leakage prevention plug 5 consists of a closed- cell rubber expanded body or an closed-cell synthetic resin expanded body and a wire connection hole part 5a with an inner diameter which adheres to the outer periphery of the electric wire 3 is formed at the center part. A line of cutting reaching the wire connection hole part 5a is provided at the outer- periphery part 5b of the plug body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pipe installed at a pipe joint connecting an electric pipe and a joint box in order to prevent sound leakage through the electric pipe buried in a wall of a building or the like. Regarding sound leakage prevention plugs.

[0002]

2. Description of the Related Art In an apartment house, a hotel room, etc., an electric pipe is used for wiring various antenna control lines such as a TV antenna line, electric wiring, a telephone line or a refrigerator from the top floor to the bottom floor or to the adjacent room. It is branched to each floor and each room while relaying with a joint box. However, since the electric pipe is cut and opened at the joint of the pipe to the joint box, the so-called connector, the sound easily leaks through the pipe, which is also a factor that reduces the sound insulation performance.

Therefore, conventionally, after passing through the electric pipe, the caulking material 105, oil soil, or the like is packed in the connector 104 of the joint box 102 as shown in FIG. 8, or in the joint box 202 as shown in FIG. A sound absorbing material 206 such as glass wool or rock wool was filled in to prevent electric noise from leaking.

[0004]

However, since the working space in the joint box 102 is scarce, the work of injecting the caulking material 105 and filling the oil soil is not easy. Also, the caulking material 105 is surely the connector 1
It was also difficult to perform a visual inspection to confirm whether or not the void of No. 04 was blocked. In addition, when the caulking material 105 or the like is packed and then connected to a mounting plate (not shown) attached to the joint box 102, or when the extra wire is stored in the joint box 102, the electric wire 103 moves around,
There is a possibility that the caulking material 105 and the oil soil may be plastically deformed to cause a gap between the filling and the electric wire. Further, careless handling of oily soil may cause the surroundings to become dirty.

On the other hand, the sound absorbing material 206 such as glass wool, rock wool or waste cloth is attached to the joint box 202.
With the method of packing inside, it was not possible to fill it sufficiently due to the storage of extra lines, and since it was not a sound insulation material, the sound insulation performance was considerably poor.

The present invention solves the above-mentioned problems and can surely close the gap of the pipe joint portion by a simple work to prevent sound leakage, and there is no fear of a gap even if the electric wire is moved after the gap is closed. It is an object of the present invention to provide a sound leakage prevention plug for electric pipes, which is highly reliable, has easy inspection management, is easy to handle, and does not pollute the surroundings and has a high sound insulation effect.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is mounted inside a pipe joint for connecting an electric pipe and a joint box, and hermetically seals the circumference of an electric wire passing through. In a sound leakage prevention plug for an electric pipe, the plug is made of a closed-cell rubber foam or a closed-cell synthetic resin foam, and has a central portion having an inner diameter that allows close contact with the outer circumference of the electric wire. It is characterized in that a wire hole portion is formed, and a notch for inserting a single wire, which extends from the inner surface of the wire hole portion to the outer peripheral portion of the plug, is provided.

Further, the invention according to claim 2 is characterized in that the plug body is formed with a taper or a chamfer on an outer peripheral portion of a substantially cylindrical shape so as to be inserted into the pipe joint portion.

The invention according to claim 3 is characterized in that the through hole portion is formed by communicating a plurality of hole portions with each other.

[0010]

According to the first aspect of the present invention, the electric wire is applied to a single cut portion formed on the outer peripheral portion of the stopper body of the sound leakage prevention stopper, and when the electric wire is pushed into the notch, the stopper body is a closed-cell rubber. Since it is a foam or a closed-cell synthetic resin foam, it is easily elastically deformed. For this reason, the electric wire is housed with its outer periphery in close contact with the through hole formed in the center of the plug. When this plug is inserted into the inside of the pipe joint that connects the electric pipe and the joint box, the plug adheres to the inner surface of the pipe joint due to elastic deformation, and seals the circumference of the electric wire that runs.

According to the second aspect of the present invention, since the taper or chamfer is formed on the outer peripheral portion of the plug body, the plug body can be easily inserted into the pipe joint.

According to the third aspect of the present invention, a plurality of electric wires are sequentially pushed through the cutout portions and housed in a plurality of wire passage holes that communicate with each other.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sound leakage preventing plug for electric piping according to the present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional view of a joint box to which a sound leakage prevention plug is attached, FIG. 2 is a front view of the sound leakage prevention plug, and FIG. 3 is a cross-sectional view showing a III-III cross section of FIG. The electric pipe 1a that is embedded in the wall of a building and descends from the upper floors branches into an electric pipe 1b that sends a required electric wire 3 to the lower floors through a joint box 2 and an electric pipe 1c that sends it to an adjacent room. Each electric piping 1
The a, 1b, 1c and the joint box 2 are connected by a connector 4 which is a pipe joint, and each pipe end is housed in each connector 4.

The electric wire 3 is passed through each pipe, and each end is sent out into the joint box 2. When the wiring is completed, the sound leakage prevention plug 5 is attached to each electric wire 3 and pushed into the connector 4 to be attached. Details of the sound leakage prevention plug 5 will be described with reference to FIGS. 2 and 3. The sound leakage prevention plug 5 is a plug made of a closed-cell rubber foam or a closed-cell synthetic resin foam made of a material that is not breathable and has a high sound insulation effect. A wire passage hole portion 5a having an inner diameter that allows close contact is formed, and a single cut portion 5c reaching the outer peripheral portion 5b of the plug body from the inner surface of the wire passage hole portion 5a is provided. The cut portion 5c is for mounting the sound leakage prevention plug 5 from the side surface of the electric wire 3, and is fitted over the electric wire 3 while opening this portion.

The material of the plug has a required elasticity in consideration of the insertion into the connector 4 and the sealing of the electric wire 3, and the electric wire 3 in the joint box 2 after being attached to the connector 4
When the wire is connected to a mounting plate (not shown) or the extra wire is stored in the joint box 2, the plug body does not plastically deform or move in the connector 4 even if the wire 3 moves. It is necessary to have the property and the frictional resistance value with the surroundings. In order to have these properties, it is most desirable that the volume foaming ratio is about 3 to 8 times.

The sound leakage prevention plug 5 has a substantially cylindrical outer shape,
A large diameter end is 1m from the inner diameter of the connector 4 on the outer periphery.
The taper end of the connector 4 is smaller than the inner diameter by about 1 mm. Further, the length of the stopper is most preferably about 20 to 30 mm, and if it is shorter than this, the retention and sound insulation properties are inferior, and if it is too long, it is made of foam. It will be rather difficult. The diameter of the through hole 5a is about 1 mm smaller than the diameter of the electric wire 3, for example, the coaxial cable 5C.
In the case of -FB (outer diameter of about 8 mm), a hole of about 7 mm is desirable.

The external shape of the sound leakage prevention plug may be such that one end of the cylindrical shape is chamfered. This embodiment is shown in FIG.
Shown in. Since the chamfer 15d of the sound leakage prevention plug 15 also exhibits the same effect as the taper, the small-diameter end portion is made smaller than the inner diameter of the connector 4 by about 1 mm.

Further, when a plurality of electric wires of two or more are to be passed through the electric pipe, a sound leakage preventing plug having a plurality of through hole portions corresponding to the number of passing wires is used. This embodiment is shown in FIGS. 5 is a front view of a sound leakage prevention plug having a two-line through hole portion, and FIG. 6 is a cross-sectional view showing a VI-VI cross section of FIG. The sound leakage prevention plug 25 is formed by connecting two through hole portions 25a having an inner diameter capable of closely adhering to the outer circumference of the electric wire 3 in the central portion of the plug body. From the communicating portion of the through hole portion 25a, a single cut portion 25c reaching the outer peripheral portion 25b of the stopper is provided.

The two electric wires 3 are sequentially pushed in through the notches 25c and housed in the respective wire passage holes 25a, 25a. With such a configuration, a hermetically sealed state can be maintained without forming a gap around the contact portion between the electric wires 3. The outer shape of the sound leakage prevention plug 25 may be tapered as shown in FIG. 6 or may be the one as shown in FIG. 7 in which one end of the cylindrical shape is chamfered as in the sound leakage prevention plug 35.

By inserting such a sound leakage prevention plug into the inside of the pipe joint, the plug elastically deforms and adheres to the inner surface of the pipe joint, and at the same time, seals the periphery of the electric wire that runs. Therefore, it is possible to prevent air and sound from passing through the electric pipe, and at the same time, prevent toxic gas from flowing through the pipe in the event of a gas leak accident or fire in the adjacent door.

[0021]

As described above, since the sound leakage prevention plug for electric piping of the present invention uses a plug body made of a closed-cell rubber foam or a closed-cell synthetic resin foam, its elasticity is improved. By utilizing this, it is possible to reliably close the gap at the pipe joint and prevent sound leakage. Further, since the plug body does not undergo plastic deformation even if the electric wire is moved after closing the gap, there is no possibility of forming a gap and the reliability of the construction is enhanced. Moreover, the inspection can be performed simply by visually confirming whether or not the insertion is performed surely. Further, unlike the conventional pouring of caulking material and filling of oil soil, the plug is easy to handle and there is no fear of polluting the surroundings.
Further, since the notch for inserting the electric wire is provided on the outer periphery of the stopper,
The sound leakage prevention plug can be attached from the side of the wire, and it can be pushed into the pipe joint simply by sliding it, making installation work extremely easy.

Further, in the sound leakage prevention plug according to the second aspect, since the taper or the chamfer is formed on the outer peripheral portion of the plug body, the plug can be easily inserted into the pipe joint.

Further, since the sound leakage prevention plug according to claim 3 is formed by connecting a plurality of wire passage holes to each other, a gap is formed around the contact portion between the electric wires even when a plurality of electric wires are passed through. Can be maintained in a sealed state.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint box to which a sound leakage prevention plug is attached.

FIG. 2 is a front view of a sound leakage prevention plug.

FIG. 3 is a cross-sectional view showing a III-III cross section of FIG.

FIG. 4 is a cross-sectional view of a sound leakage prevention plug having a chamfer at one end.

FIG. 5 is a front view of a sound leakage prevention plug having a two-line through hole.

6 is a cross-sectional view showing a VI-VI cross section of FIG.

FIG. 7 is a cross-sectional view of a sound leakage prevention plug according to another embodiment in which one end is provided with a chamfer.

FIG. 8 is a cross-sectional view of a conventional joint box that fills a pipe joint with caulking material.

FIG. 9 is a cross-sectional view of a conventional joint box filled with a sound absorbing material.

[Explanation of symbols] 1a Electric piping 2 Joint box 3 Electric wire 4 Connector 5 Sound leakage prevention plug 5a Through hole 5b Outer periphery 5c Notch

Claims (3)

[Claims] 1. A soundproofing stopper for an electric pipe, which is mounted inside a pipe joint for connecting an electric pipe and a joint box, and which seals the periphery of an electric wire that runs through, in a closed-cell rubber foam or a closed cell. A plug body made of a synthetic resin foam of the system, wherein a through hole portion having an inner diameter capable of closely adhering to the outer circumference of the electric wire is formed in the central portion thereof, and the outer circumference of the plug body from the inner surface of the through hole portion. A sound leakage preventing plug for electric piping, which is provided with a notch for inserting a single electric wire that reaches the portion. 2. The leakage preventing plug for electric pipes according to claim 1, wherein the plug has a taper or a chamfer formed on an outer peripheral portion of a substantially cylindrical shape so as to be inserted into the pipe joint. 3. The sound leakage preventing plug for an electric pipe according to claim 1, wherein the through hole is formed by connecting a plurality of holes to each other.