JPH0718320U - Composite curl cord with coaxial - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a cable mainly used for automobile phones and the like, and is a coaxial cable having excellent curl expansion / contraction characteristics (curl spring returnability, hereinafter referred to as "restorability") and flexibility. It is intended to provide a composite curl code with a key. [Structure] The present invention has a center yarn 5 around a coaxial cable 1.
A plurality of core wires 2 and one or more intervening wires 3 covered with a thermoplastic resin 6 having a flexural modulus of 6,000 kgf / cm ² or more for improving stretchability and flexibility are arranged on the top. A coaxial curl cord 1 having a sheath 4 provided thereon.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a composite curl cord with a coaxial cable, which has excellent curl expansion and contraction characteristics (curl spring returnability, hereinafter referred to as "restorability") and flexibility, which is mainly used in automobile telephones and the like.

[0002]

[Prior art]

 In recent years, car-mounted telephones (vehicle-mounted type) and car-mounted telephones (which can be used outside the vehicle) for automobiles as mobile communications have dramatically decreased in size, and large telephones have become pockets. Mobile phones that are small enough to fit in and lightweight (200 to tens of grams) have begun to appear on the market. When using a mobile phone inside a car, the output is weak and it is shielded by the body of the car. Therefore, the method using the antenna outside the car is generally adopted. A composite cable including a coaxial cable is required for the cable connecting the mobile phone and the antenna outside the vehicle. Usually, a curl code is used as a cord connected to the telephone side in terms of operability of the telephone. Naturally, this curl code also includes a coaxial cable.

[0003]

[Problems to be solved by the device]

 To manufacture a curl cord, a wire is wound around a round bar having a predetermined outer shape, and heat treatment is performed at 120 ° C. to 140 ° C. for about 15 minutes. Then, after being cooled and curled, a rewinding process is performed to reverse the curling direction. To improve the curl characteristics of this curl cord, especially the expansion and contraction characteristics. Elastomer is used as the insulator material. ． Elastomer is used for the sheath material. ． Make the curl diameter appropriate for the cable outer diameter. There is a method such as. Here, when an insulator or a sheath material is not made of an elastomer and the elastic body does not have the performance of the elastic body, for example, PVC is used, the expansion and contraction characteristics are not good and the trunk length of the curl cord is not good. The curl cord will not be restored to its original state when it is stretched to about 4 times its length. Therefore, the appropriate material must be selected each time depending on the structure of the cable. However, when the curl cord is shielded, for example, when there is a braided shield or an aluminum shield, or when the cable core wire contains a coaxial cable, when the curl cord is extended, the copper wire or aluminum tape of the shield constituent material is used. When the curl cord is stretched, it is plastically deformed, and the restorability when the curl cord is stretched deteriorates. Elastomers are used for the insulation material of the core wire and the sheath material to improve the resilience as much as possible, but there is a problem that the effect is not so great. For example, it is quite effective to use urethane or PVC-polyester elastomer blend material as the sheath material to increase the wall thickness. However, due to the recent demand for smaller cable due to the miniaturization of equipment, the cable should be made that thick. I can't do that. Taking a car phone as an example, the antenna outside the car and the mobile phone are connected, but at this time at least a coaxial cable is required. Therefore, it is necessary to connect the coaxial curl cord to the telephone to make a call. In this case, since it is the curl code of the telephone, it must be easy to extend and have excellent recoverability. Also, as mobile phones are becoming smaller and smaller, curl cords are also required to have a smaller diameter, and it is difficult to take measures to improve the curl characteristics by increasing the thickness of the sheath. In light of the above, there has been a demand for a new measure in the composite curled cord with a coaxial cable or the curled cable with a shield to have good elasticity without increasing the cable diameter of the curled cord. As a result of repeated studies in order to solve such technical demands, the present invention has shown that the present invention is a cable mainly used for car telephones, etc. The purpose is to provide a composite curl cord containing a coaxial cable with excellent flexibility.

[0004]

[Means for Solving the Problems]

The present invention includes a plurality of core wires 2 around a coaxial cable 1 and a thermoplastic resin 6 having a bending elastic modulus of 6,000 kgf / cm ² or more on a central yarn 5 for improving elasticity and flexibility. A composite curl cord 1 with a coaxial line, characterized in that an intervening wire 3 consisting of one or more wires covered with is arranged and a sheath 4 is provided thereon.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 (a) shows the composite curl cord with coaxial cable of the present invention.1Cross section and intervening lineThree2 is an enlarged cross-sectional view of 1 is a coaxial cable, 2 is a core wire,ThreeIs an intervening wire in which the central yarn 5 is covered with a thermoplastic resin 6, which is a feature of the present invention, and 4 is a sheath. As can be seen from the figure, the present invention has a plurality of core wires 2 around a coaxial cable 1 and a bending elastic modulus of 6,000 kgf / cm on a central yarn 5 to improve elasticity and flexibility.²An intervening wire consisting of one or more coated with a thermoplastic resin 6 having the aboveThreeIs arranged and a sheath 4 is provided on top of the1Is. Conventionally, as shown in FIG. 2, the intervening wire of the present invention is used.ThreeInstead of the above, an intervening yarn made of cotton yarn or polypropylene yarn was used. As the material of the central yarn 5, aramid fiber, tetron yarn, etc., which have high tensile strength and are thin wires, are preferable, but aramid fiber is preferable. This is heat-treated for about 15 minutes at 120 ℃ -140 ℃ when processing the cable, but the shrinkage is 0% when the aramid fiber is used for the core yarn by this heat treatment, but it is 0.7% for the Tetoron yarn. This is because it becomes so much. Examples of the thermoplastic resin 6 covering the outer circumference of the core yarn 5 of the present invention include polyurethane, polyester elastomer, 12 nylon, ETFE and the like. This intervening lineThreeIs required to have a function to restore the original state of the shield deformed by the strain applied when the curl is extended, so it is better to use a hard material. That is, the intervening lineThree Curl code using elasticity of1Not only the expansion and contraction characteristics of the Three Since the center thread is contained inside, the tensile stress of the curl cord can be relaxed because the tensile stress of the cable is received by this center thread, and the bendability can be improved. It will be possible. Bending modulus of elasticity is at least 6,000kgf / cm ² Materials having the above values are preferable. Inventive coaxial curl cord1The specific structure of is shown in Table 1.

[0006]

[Table 1]

Table 2 shows the results of the characteristic test comparison between the device of the present invention and the conventional product (comparison of rate of change of own weight).

[0008]

[Table 2]

In the evaluation test, the curl cord was expanded and contracted 4 times and 5 times as long as the body length, and the movement was repeated 30,000 times, and after 5 minutes and 24 hours, the self-weight length of the cord was measured again to obtain the change rate. It was The rate of change in self-weight was calculated by the following formula. Post-test self-weight length-initial body length Self-weight length change rate = ───────────── × 100% Initial body length Here, the conventional product is a cable with the same core structure instead of the intervening wire. It uses cotton intervention. As is apparent from the results shown in Table 2, the coaxial composite curled cord 1 of the present invention has a small rate of change in self-weight and excellent evaluation results. In particular, it can be seen that almost 24 hours later, the original state is restored.

Up to now, FIG. 1A has been shown as a representative example, but the invention is not limited to this as long as it includes a coaxial cable. Furthermore, it goes without saying that various modifications are included within the scope of the present invention in designing the number of cores and the insulator.

[0011]

[Effect of device]

As described above, according to the composite curl cord 1 with a coaxial cable of the present invention, since the curl cord has an excellent expansion / contraction property (curl spring return property, hereinafter referred to as “restorability”) and bending property, it can be effectively manufactured. The target value is very large.

[Brief description of drawings]

[FIG. 1] (a) is a composite curled cord with coaxial cable of the present invention
1 is a sectional view of FIG. 1 and an enlarged sectional view of an intervening line 3 . (B) is an external view of the composite curl cord 1 with a coaxial cable according to the present invention.

FIG. 2 is a cross-sectional view of a conventional coaxial curl cord 1 .

[EXPLANATION OF SYMBOLS] 1 coaxial cored composite coiled cord 1 devised coaxial cable 2 core 3 interposed lines 4 sheath 5 around threads 6 thermoplastic resin 1 'conventional coaxial-containing composite curl cord 1' coaxial cable 2 'core 4 ′ Sheath 7 ′ Center thread

Claims (1)

[Scope of utility model registration request] 1. A plurality of core wires around a coaxial cable and one or more intervening wires covered with a thermoplastic resin having a bending elastic modulus of 6,000 kgf / cm ² or more are arranged on a central yarn. Coaxial curled cord with a sheath on top.