JPH06165328A - Call wire for electric wiring - Google Patents

Abstract

PURPOSE:To contrive to improve wire-passing workability by attaching a hard spherical having a diameter larger than that of a stranded wire to the pipe- inserting part of the stranded wire. CONSTITUTION:The basic structure of a call wire 1 for electric wiring is, e.g. a stranded wire 2 composed of three synthetic-resin monofilaments. Further, a hard spherical 5 having a diameter larger than that of the stranded wire 2 is fixed on the pipe-inserting part 4 side of the stranded wire 2. In this case, the hard spherical 5 desirably has a diameter ranging from 1.5 times as long as the diameter of the stranded wire 2 to 95% and less of the inner diameter of a pipe to be inserted. Thus, slip characteristics of the pipe-inserting part 4 are improved and the wire-passing resistance can be made small so that it is possible to improve wire-passing workability particularly at the time of letting the wire pass through a complicated electric piping having a plurality of continuous bents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nominal wire for electric wiring, which has a very small resistance to a wire, has an excellent workability for running a pipe, and has sufficient strength and durability.

[0002]

2. Description of the Related Art In general, indoor and outdoor electric wiring work in houses, buildings, factories, etc. is carried out by inserting wires into the previously installed electric wire pipes when the interior work is completed. Has been. And
In this wiring work, the electric wires run into the electric pipe first of all, the wire called the nominal line is mainly pushed into the pipe, and then the electric wire is connected to the terminal of the nominal line.
Furthermore, it is carried out by pulling out the nominal line out of the pipe.

In the above-mentioned wire passing work, a steel wire has been mainly used as a nominal wire for guiding and passing the electric wire into the pipe, but the steel nominal wire is high. It had the drawbacks of being difficult to handle due to its weight and being liable to be stiff and hard, which could easily damage the decoration and interior during use. As a calling line that improves the above drawbacks,
For example, it is known that filaments made of synthetic resin such as polyacetal have the fatal drawback that the conventional synthetic resin calling wires are easily scratched during use and are easily cut by the scratches. Had. This drawback can be improved to some extent by appropriately stretching the synthetic resin filament that is the material to give it adequate strength, but the nominal wire made of synthetic resin filament has a strong curl. For this reason, there has been a drawback that it is extremely difficult to wire a pipe that is long and has many bent portions and has a large frictional resistance.

Under the circumstances, the applicant of the present invention conducted a study for the purpose of obtaining a calling wire having sufficient strength and excellent wire passing ability, and as a result, twisted and fixed a plurality of synthetic resin monofilaments. It was found that the nominal wire for electric wiring composed of the following twisted wire meets the above-mentioned object, and it was previously proposed (Japanese Utility Model Publication No. 61-24424 and Japanese Utility Model Publication No. 3-36177).

Since the above-mentioned nominal wire for electric wiring proposed by the present applicant has no entanglement and has a stranded wire structure, it is passed through the pipe in a point contact state. The line resistance is small and the workability is considerably improved. However, as a result of repeating a more detailed practical test thereafter, the calling wire made of the twisted wire proposed by the applicant of the present invention has improved the workability of passing wire, but it is particularly continuous at the bent portion. It has been found that there is still a limit to the workability of passing a wire through a complicatedly-shaped pipe having a plurality of wires.

[0006]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of investigations for solving the problems in the above-mentioned conventional calling wire for electric wiring. Therefore,
The object of the present invention is to improve the wire resistance particularly when the wire is run through an electric pipe having a complicated shape having a plurality of continuous bent portions, and the wire wiring operability is dramatically improved. To provide.

[0007]

In order to achieve the above object, the nominal wire for electrical wiring of the present invention has a basic structure of a twisted wire or a single wire made of a synthetic resin monofilament, and guides the electric wire into a pipe. In the nominal wire for electric wiring used for, a hard spherical body having a diameter of 1.5 to 95% of the inner diameter of the pipe to be inserted into at least the pipe insertion part of the twisted wire or the single wire from the diameter of the twisted wire or the single wire. 1
It is characterized by mounting one or more pieces.

The thus-obtained nominal wire for electric wiring according to the present invention has a basic structure of a stranded wire or a single wire made of a synthetic resin monofilament, and therefore, when compared with a conventional metal wire, a wire for passing through a pipe. It has a low resistance and can be easily run with excellent workability, especially for pipes that are severely bent. Moreover, since one or more hard spherical bodies having the above diameter are attached to at least the pipe insertion portion of the stranded wire or the single wire, the wire passage resistance of the tip guide portion is further reduced, and in particular, a plurality of bent portions are continuously formed. The workability of passing a wire inside an electric pipe with a complicated shape is
Greatly improved than before.

In the present invention, the synthetic resin monofilament used as the material of the twisted wire or the single wire is a thermoplastic resin having heat shrinkability and heat fixing property, for example, polyamide such as nylon 6, nylon 66, nylon 610, polyethylene terephthalate, It is a relatively thick monofilament having a diameter of about 1 to 9 mm obtained by melt spinning a polyester such as polybutylene terephthalate and a polyolefin such as polyethylene and polypropylene by a normal melt spinning method and then stretching.

These synthetic resin monofilaments are
It may contain heat-resistant agents, weather-resistant agents, light-resistant agents, plasticizers, lubricants, antistatic agents and usual additives such as dyes and pigments. In particular, when a monofilament is melt-spun or after melt-spun, if a lubricant-containing layer such as polyorganosiloxane or ethylenebisstearylamide is formed on at least the surface layer portion, the line resistance of the nominal wire can be further improved, which is advantageous. Is. In addition, especially when a coloring agent such as a fluorescent pigment or a phosphorescent pigment is included, the visibility and workability of the electrical wiring calling line when performing the wiring work in a dark place such as a building where the work has not been completed yet Is improved and advantageous.

These synthetic resin monofilaments can form the basic structure of the nominal wire in the state of a single wire as they are, but a plurality of synthetic resin monofilaments, for example, 2 to 5 are heated while being twisted in a tensioned state. After forming substantial twisting and heat setting, quenching is performed to form a stranded wire, and when this stranded wire forms the basic structure of the nominal wire, when the nominal wire is inserted into the pipe, Since the wires are passed while being in contact with each other in the state of point contact, the wire resistance of the call wire is reduced, and excellent wire workability can be expected.

The diameter of a single wire or a stranded wire made of a synthetic resin monofilament used in the present invention is not particularly limited and is appropriately selected according to the length and thickness of the pipe to be used, but the wire diameter is usually about Those having a diameter of about 2 to 9 mm are preferably used. The configuration of the electrical wiring nominal line of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a first view of a nominal wire for electrical wiring of the present invention.
2 is a front view of a tip portion showing a second embodiment, FIG. 3 is a front view of a tip portion showing a third embodiment, and FIGS. 4 and 5 are electric wirings of the present invention. It is a front view which shows an example of the piping which applies a service call line and performs a wire work. In the first embodiment shown in FIG. 1, the electrical wiring nominal wire 1 has a basic structure of a twisted wire 2 formed by twisting and fixing, for example, three synthetic resin monofilaments. If necessary, the wire connection terminal 3 is attached to the end side) by adhering, fusing or caulking.

A hard spherical body 5 having a diameter larger than the diameter of the twisted wire 2 is fixed to the pipe insertion portion 4 side located at the other end of the twisted wire 2 by adhesion or caulking. Here, it is desirable that the hard spherical body 5 has a diameter of 1.5% or less of the inner diameter of the pipe to be inserted from 1.5 of the diameter of the twisted wire 2 forming the basic structure of the nominal wire 1 for electric wiring. If it is less than 1.5 times the wire, the effect of improving the workability of the pipe insertion part 4 in the passage of the pipe is small, and the inner diameter of the pipe to be inserted is 95
If it exceeds%, the resistance of the bent portion in the pipe to be passed increases, which is not preferable.

The constituent material of the hard spherical body 5 is not particularly limited as long as it has a certain degree of hardness, and examples thereof include wood, stone material, rubber and synthetic resin. Among them, the durability is excellent. From the point of view, a synthetic resin is preferably used. The shape of the hard spherical body 5 is preferably a circular sphere or an ellipsoid, but if the whole is smooth, it may be an approximate body thereof.

As described above, by attaching the hard spherical body 5 to the pipe insertion portion 4 of the electrical wiring nominal wire 1, the sliding characteristic of the pipe insertion portion 4 is improved and the line resistance can be reduced. , For example, as shown in FIG.
Even when a plurality of 0 ° female elbows 8 are connected to each other and the pipes are severely bent and are passed in the A to B direction, excellent lineability is exhibited.

When the nominal wire for electric wiring 1 shown in FIG. 1 is used to connect to the piping shown in FIG. 4, the piping insertion portion 4 of the nominal wire for electric wiring 1 is first connected to the pipe A. After inserting from the portion and making the pipe insertion portion 4 reach the portion B,
By fixing the electric wire to the electric wire connecting terminal 3 and then pulling the electric pipe nominal wire 1 from the B side, it is possible to complete the electric wire passage into the pipe.

Next, the second embodiment shown in FIG. 2 is that a plurality (four in the drawing) of hard spherical bodies 5 are fixed to the pipe insertion portion 4 of the electrical conductor nominal wire 1. This is different from the above embodiment. By providing the plurality of hard spherical pieces 5 in this manner, the wire passage resistance of the pipe insertion portion 4 can be further reduced, and the wire passage workability can be further improved.

Furthermore, in the third embodiment shown in FIG. 3, a guide portion 6 made of a flexible material is connected to the pipe insertion portion 4 side of the electrical wiring nominal wire via a connecting portion 7, and the guide portion 6 is formed. This is different from the first and second embodiments in that a plurality of (four in the drawing) hard spherical bodies 5 are movably attached to the above. In this way, by making the hard spherical body 5 movable in the pipe insertion portion 4, the hard spherical body 5 is inserted into the pipe while rotating, so that the line resistance of the pipe insertion portion 4 is reduced. It is possible to further reduce the number of lines, and to expect even better line workability.

In the first and second embodiments as well, it is needless to say that the hard spherical body 5 can be configured to be movable with respect to the pipe insertion portion 4. And further, the first
In the third embodiment, the hard spheres 5 are treated with a smoothing agent such as polyorganosiloxane,
It is possible to further reduce the line resistance of the pipe insertion portion 4. Hereinafter, the structure and effect of the nominal wire for electric wiring of the present invention will be further described with reference to examples.

[0021]

EXAMPLE A polyacetal monofilament (No. 1) having a diameter of 6.0 mm and a polyethylene terephthalate monofilament having a diameter of 2.6 mm were drawn together 35 times / 35 times.
Mating wire, heat treatment at 200 ℃ for 45 seconds, quenching in normal temperature water, and twisting and fixing, 6mm diameter stranded wire (No.2), which is the basic structure, is the pipe insertion part of the nominal wire for electrical wiring. On the other hand, the structure shown in FIG.

That is, by attaching four hard spherical members made of ABS resin having a diameter of 20 mm to the guide portion made of a steel stranded wire having a length of 100 mm at the tip of the nominal wire for electric wiring, the electric wiring of the present invention is provided. Nominal line No. 1 and
No. 2 was manufactured. Also, for comparison, a comparative electrical wiring nominal consisting of a structure in which the metal wire connecting terminal is caulked and fixed instead of the hard spherical body to the respective pipe insertion portions of the polyacetal monofilament and the polyethylene terephthalate stranded wire. Lines No. 3 and No. 4 were manufactured.

For each of these nominal wires for electrical wiring, a bent continuous pipe having an inner diameter of 22.5 mm having corners a to c in which three 90 ° female elbows 8 shown in FIG. 4 are continuously arranged, and FIG. In the case of pushing from the point A to the S-shaped pipe having an inner diameter of 22.2 mm and having corners a to e formed by connecting the straight pipe portion 9 having a length of 3.7 m and the 90 ° elbow 10 shown in FIG. Table 1 shows the results of evaluation of the workability (passability at each corner).

[0024]

[Table 1] As is clear from the results in Table 1, the electrical wiring nominal lines No. 1 and No. 2 of the present invention have a better wire workability than the comparative electrical wiring nominal lines No. 3 and No. 4. It is extremely good.

[0025]

As described above, the nominal wire for electric wiring according to the present invention has a twisted wire or a single wire made of a synthetic resin monofilament, at least at a pipe insertion portion thereof, and the diameter of the twisted wire or the single wire is 1.5 times or more. 95 of inner diameter of pipe to insert
Since one or more hard spheres having a diameter of less than or equal to 5% are attached, the wire resistance of the tip guide part is further reduced, and in particular, the wire is run in a complicated-shaped electric pipe having a plurality of bent parts. In this case, the workability of passing wires has improved dramatically compared to the past.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of an electric wiring nominal wire of the present invention.

FIG. 2 is a front view of a tip portion showing a second embodiment of the present invention.

FIG. 3 is a front view of a tip portion showing a third embodiment of the present invention.

FIG. 4 is a front view showing an example of piping for conducting a wiring work by applying the nominal wire for electric wiring of the present invention.

FIG. 5 is a front view showing another example of piping for conducting a wiring work by applying the nominal wire for electric wiring of the present invention.

[Explanation of symbols]

1 Nominal wire for electric wiring 2 Stranded wire 3 Terminal for electric wire connection 4 Pipe insertion part 5 Hard spherical body 7 Connecting part 8 90 ° Recommended elbow 9 Straight pipe part 10 90 ° Elbow

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koichi Kubo 1st Kawara, Showa-cho, Okazaki-shi, Aichi Toray Monofilament Co., Ltd.

Claims (2)

[Claims] 1. A nominal wire for electric wiring, which has a basic structure of a twisted wire or a single wire made of a synthetic resin monofilament and is used for guiding an electric wire into a pipe, in at least a pipe insertion portion of the twisted wire or the single wire, A calling wire for electric wiring, which is equipped with one or a plurality of hard spherical bodies having a diameter of not more than 95% of the inner diameter of a pipe to be inserted from 1.5 of the diameter of these twisted wires or single wires. 2. The nominal wire for electric wiring according to claim 1, wherein the hard spherical body is fixedly or movably attached to a tubing insertion portion of a stranded wire or a single wire.