JPH0324003B2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Objectives of the Invention] The present invention relates to electric wires and cables used in machines and appliances that are forced to move, such as control cables used in industrial robots, and movable lighting equipment. Electric wires that are particularly suitable for applications where flexibility and stretchability are required, such as cables used for detection and measurement between buoys installed on the sea and sonar installed under the sea.・It is related to cables.

For example, when a school of fish in the sea is detected from a ship on the sea, an airplane in the air, or a receiving station on land, a sonar 3 installed under the sea is used as shown in FIG. To explain in more detail, a buoy 1 that has the function of converting the electrical signal from the sonar 3 into radio waves and transmitting them to ships, airplanes, or receiving stations is floated on the sea surface, and is suspended from the buoy 1 into the sea. A sonar 3 having a function of detecting the presence of schools of fish etc. in the sea is suspended from the lower end of a cable 2 (hereinafter referred to as sonobuoy cable 2). The existence of a school of fish, etc. is detected by the sonar 3, and the received signal is transmitted from the sonar 3 to the buoy 1 via the sonobuoy cable 2, and this buoy 1 is then waiting nearby on the sea, on land, or in the sky. This is done by transmitting to a receiver.

By the way, in order to accurately detect the presence or absence of schools of fish, etc. in the sea, and their positions, it is desirable that the sonar 3 is fixedly installed at a fixed position in the sea. Therefore, the sonar 3 needs to be installed so that even if the buoy 1 is swayed by the waves, it will not be swung along with it. In other words, due to the swing of buoy 1, sonobuoy cable 2
Even if tension is applied to the sonar 3
In other words, it is necessary to use a cable 2 for the sonobuoy that can absorb and relieve the tension generated by the swinging of the buoy 1. Considering this,
Conventionally, as the cable 2 for a sonobuoy, a spring cable 2 or the like formed into a coil shape as shown in FIG. 1 has been used.

However, in this spring cable 2, when a large tension that exceeds the allowable value is applied, and as a result, the coil state is deformed into a straight state by the tension, twisting occurs in the spring cable 2, and therefore the electrical signal is not transmitted. may damage electrical conductors.

The purpose of the present invention is to eliminate the drawbacks of the conventional products described above, and to have flexibility and stretchability. The purpose of the present invention is to provide a new stretchable electric wire/cable that does not cause damage to the electric wires and cables.

[Summary of the Invention] That is, the gist of the present invention is that in a product in which a horizontally wound layer or a mixed woven braided layer made of insulated wire and fibers is formed on an elastic string-like core, the horizontally wound layer or mixed woven braided layer is A stretchable electric wire/cable is formed loosely on an elastic string-like core, and further has an insulated electric wire horizontally wound or braided more loosely than the fibers.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 2, 4 is a silicone rubber tube elastic cord-like core, and 5 is an electrical conductor made of copper stranded wire. The insulated wire 6 is made of two-stranded polyester fiber having a thickness of 250 denier and is coated with ethylenetetrachlorethylene insulation, and the insulated wire 5 and the fiber 6 are used as a braided thread, and each braided thread is used as the elastic string-like core. The interwoven braided layer 7, which is attached somewhat loosely to the body 4, is formed on the elastic string-like core body 4. Moreover, in this case, the braided thread made of the insulated wires 5 is braided in a state that it is looser than the braided thread made of the fibers 6.

If we consider the case where a stretchable electric wire having such a configuration is used in place of the spring cable 2 shown in FIG. When tension is applied to the electric wire due to the influence of waves, the elastic string-like core 4 is elongated, and each braided thread is deformed into a longitudinally spliced shape, as shown in FIG. 3, so that the tension can be absorbed. Moreover, at this time, most of the tension is applied to the elastic string-like core 4.
In addition, in each of the braided yarns 5 and 6 constituting the interwoven braided layer 7, the braid angle simply becomes smaller (changes from θ1 shown in FIG. 2 to θ2 shown in FIG. 3).
As a result, almost no tension is applied to the insulated wire 5 itself, and therefore damage to the insulated wire 5 due to tension is effectively prevented. Furthermore, the great effect of the stretchable electric wire of this example is exhibited when a tension even greater than the above-mentioned tension is applied. That is, in this case, the elastic string-like core 4 and the interwoven braided layer 7 are further deformed to a smaller diameter, and each braided thread attempts to deform into a longitudinally spliced shape, but when the tension reaches a predetermined level, the interwoven braided layer 7 is deformed to a smaller diameter. The tightening of the layer 7 against the elastic cord-like core 4 reaches its limit, and the entire elastic wire stops elongating, and from then on, the entire elastic wire acts as a tensile strength body. However, in this case, only the insulated wire 5 has a fiber yarn 6 that is a braided yarn.
Since it is braided in a looser state than the above, almost no tension is applied only to the insulated wire 5, and therefore the insulated wire 5 is safely protected.

In the above-mentioned embodiment, the interwoven braided layer 7 in which the insulated wire 5 and the fibers 6 are braided threads is disposed on the elastic string-like core body 4; It is also conceivable to arrange a horizontally wound layer on the elastic string-like core 4.

Furthermore, as for the structure of the elastic string-like core body 4, in addition to the structure described in the above-mentioned embodiment, it is also possible to use a structure in which solid string elastic threads are twisted together, or a structure in which elastic plates or elastic films are assembled.

In addition, as the material of the elastic string-like core body 4, butyl rubber, natural rubber, styrene-butadiene rubber,
Examples include chloroprene rubber, acrylonitrile rubber, ethylene propylene rubber, butadiene rubber, chlorosulfonated polyethylene, urethane rubber, acrylic rubber, ether rubber (hydrin rubber, oxide rubber), fluorine rubber, thermoplastic rubber, etc. It is not particularly limited to the above-mentioned elastic body as long as it has the following.

In addition, the material of the fiber 6 is not limited to polyester resin, but also polyamide resin, fluorine resin,
Synthetic resins such as polyvinyl alcohol resins, silk threads, cotton threads, glass fibers, etc. may also be used.

Furthermore, in the above-mentioned embodiment, the present invention shows a case in which the stretchable electric wire/cable is used as a cable for a sonobuoy, but it can also be used in other applications such as control cables used in industrial robots and lighting equipment that is forced to move. such as the electric wires and cables used,
It can also be used particularly where stretchability and flexibility are required. In particular, if the electric wire/cable of the present invention is used, the shape will be narrower than that of the spring cable 2 shown in FIG. 1, resulting in a significant improvement in terms of space factor.

[Effects of the Invention] As described above, according to the present invention, when forming a horizontally wound layer or a mixed woven braided layer by mixing an insulated wire and fibers on an elastic string-like core, the horizontally wound layer or mixed woven braided layer is Since the layer is loosely formed on the elastic string-like core and the insulated wire is horizontally wound or braided more loosely than the fibers, the tension generated during use does not affect the insulated wire. Therefore, damage to insulated wires caused by twisting, etc. can be eliminated, and its industrial value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing how the sonobuoy cable is used, Fig. 2 is a front view showing an embodiment of the elastic wire/cable of the present invention, and Fig. 3 shows the deformed state of the elastic wire shown in Fig. 2. FIG. DESCRIPTION OF SYMBOLS 1... Buoy, 2... Cable for sonobuoy, 3... Sonar, 4... Elastic cord-like core, 5... Insulated wire, 6... Fiber, 7... Mixed woven braided layer.

Claims (1)

[Claims] 1. In a product in which a horizontally wound layer or a mixed woven braided layer made of insulated wire and fiber is formed on an elastic string-like core, the horizontally wound layer or mixed woven braided layer is formed loosely on the elastic string-like core. Furthermore, a stretchable electric wire/cable is characterized in that the insulated electric wire is horizontally wound or braided more loosely than the fibers.