JPS6122424Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a call wire for electrical wiring having sufficient strength and wire passing ability.

Generally, electrical wiring work for offices, shops, residences, factories, etc. is carried out by running electric wires into pre-installed electric wire piping after interior work is completed. In this wiring work, the wire is routed into the pipe by first pushing the wire called the call wire into the pipe, then connecting the wire to the end of the call wire, and then connecting the wire to the end of the call wire. This is done by pulling out the pipe from the pipe.

In this work, steel wire has traditionally been used as the call wire used to guide and route the wire into the piping, but this method is difficult to handle due to its high weight and its stiffness. Due to its strength and hardness, it has disadvantages such as being susceptible to damage to decorations and interior decorations during use.

For example, a wire made of synthetic resin such as polyacetal is known as a call wire that overcomes this drawback, but synthetic resin call wires are easily damaged during use, and these scratches can easily break, which is a fatal problem. It has some drawbacks. This drawback can be improved to some extent by appropriately stretching the synthetic resin filament used as the material to give it appropriate strength, but the wire made of drawn synthetic resin filament has strong curls, so Moreover, it is extremely difficult to route the wire through piping that has many bends and high frictional resistance.

Therefore, the inventors of the present invention investigated the purpose of obtaining a calling wire with sufficient strength and excellent wire passing ability, and as a result, they discovered that it was constructed from a twisted wire made by twisting and fixing multiple drawn synthetic resin threads. It has been found that the above object can be effectively achieved by the characteristic call wire for electrical wiring.

The stranded wire constituting the calling wire of the present invention is a first wire made by twisting and fixing a plurality of drawn synthetic resin threads.
It is of the form shown in the figure. Here, the synthetic resin drawn yarn that is the material of the twisted wire is a thermoplastic resin that has heat-shrinkability and heat-setting properties, such as nylon 6,
Comparison of wire diameters of approximately 1 to 4 mm made by spinning polyamides such as nylon 66 and nylon 610, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and polyolefins such as polyethylene and polypropylene, etc., using a normal melt extrusion method and then drawing them. It is a thick monofilament. Multiple pieces of these synthetic resin drawn threads,
For example, after heating 2 to 5 strands while twisting them together under tension to cause substantial twisting and heat fixation,
By rapid cooling, a stranded wire with uniform twisting and high strength can be obtained. There is no particular limit to the wire diameter of the stranded wire used in this invention, and it is selected appropriately depending on the thickness and length of the piping used, but the wire diameter is usually about 2.
A diameter of about 12 mm is preferably used.

For example, the call line made of stranded wire of the present invention has a second
As shown in the figure, a wire connection terminal 2 can be attached to the tip of the stranded wire 1 by adhesion, fusion, or caulking, if necessary.

The call wire of the present invention having such a structure is flexible, strong, and has great strength, so it is easy to push into the pipe, and it does not make surface contact with the inner surface of the pipe like conventional call wires. Since it is inserted in point contact with the pipe, there is little frictional resistance, and the ability to pass the wire into the pipe is extremely good. Furthermore, since the calling wire of the present invention is made of stranded wire, it will not easily break even if it is slightly damaged, and since there is no curling, the guideability of the tip is extremely good.

Therefore, according to the calling wire of the present invention, it is possible to easily run the wire even into the wire piping, which is quite long and has many bends and curves.
More efficient piping work can be achieved than with conventional call lines.

Example As shown in Figure 3, the inner diameter is 22.2 mm and the total length is 31.0 m.
(A) as a call line to the C-shaped pipe (length of diameter portion A: approx. 11 m, length of straight portion B: approx. 3.7 m);
Three stretched polyethylene terephthalate monofilaments with a diameter of 2.7 mm are twisted together at a rate of 45 times/m,
Stranded wire with a diameter of 5.6 mm obtained by heat treatment at ℃ for 45 seconds and quenching, (B) nylon 6 drawn thread with a diameter of about 5.6 mm, and (C)
When three polyacetal molded filaments with a diameter of approximately 5.6 mm were connected as a nominal line, the possible length of the wire was 31 m for the nominal line (A) of the present invention, while (B) (C) was about 20 meters, and it was impossible to run the line further than that.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a stranded wire, FIG. 2 is a perspective view of an embodiment of the call wire of the present invention, and FIG. 3 is a plan view of a C-shaped electric wire piping used in an embodiment of the present invention. 1...Twisted wire, 2...Terminal for connecting electric wires.

Claims (1)

[Scope of utility model registration request] A call wire for electrical wiring characterized in that it is constructed from a stranded wire made by twisting and fixing a plurality of drawn synthetic resin threads.