JP4634635B2 - Telescopic wire and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an expandable electric wire, and more particularly, to an expandable electric wire that can be applied to various signal wires and has high durability against not only flexibility but also elongation and twisting, and a method for manufacturing the same.
[0002]
[Prior art]
A conventional electric wire is mainly a copper wire as a core wire, and an insulated wire having a structure in which a plurality of fine copper wires are bundled to form a core wire and an outer periphery thereof is covered with an insulator is very common.
[0003]
And in the conventional electric wire, in order to give flexibility with respect to bending, there is one in which the outer periphery of a core wire made of a thin copper wire is coated with a synthetic resin such as soft rubber or vinyl chloride. For example, as an earphone cord, there is a cord in which three signal wires in which copper fine wires are covered with a synthetic resin are collectively covered with a synthetic resin.
[0004]
[Problems to be solved by the invention]
However, although the above-mentioned conventional covered electric wire has flexibility with respect to bending, there is almost no stretchability. For this reason, it cannot be used particularly in parts that are repeatedly pulled or twisted. For example, it is highly reliable as a signal line (communication line) disposed in the part of an electronic wand or a foldable electronic / electric product. Could not be applied.
[0005]
In view of the above-described problems, an object of the present invention is to provide a stretchable electric wire that is highly resistant to elongation and twist as well as flexibility to bend and a method for manufacturing the same.
[0006]
[Means for Solving the Problems]
The configuration of the present invention made to achieve the above object is as follows.
[0007]
That is, the first expandable electric wire according to the present invention includes at least one stretchable first core wire and a conductive wire disposed on the outer periphery of the stretchable core member, around the first core wire. And a plurality of second core wires, and the first and second core wires are collectively covered with a braided or twill-shaped covering.
[0008]
The above-mentioned first stretchable electric wire of the present invention has as a further preferable feature,
“The longitudinal elastic modulus of the first core wire is larger than the longitudinal elastic modulus of the second core wire”,
"The first core wire is formed by spirally winding two threads on the left and right around the outer periphery of a stretchable core material."
“The second core wire is formed by spirally winding a conductive wire formed by twisting a plurality of enamel wires around the outer periphery of a stretchable core material in two strips on the left and right.”
“The conductive wire is formed by twisting a plurality of enamel wires”,
including.
[0009]
Moreover, this invention is a method of manufacturing the said 1st expansion | extension electric wire of this invention,
Around the at least one first core wire that can be stretched, a plurality of second core wires formed by arranging conductive wires on the outer periphery of the stretchable core member are arranged, and the first and second core wires are arranged. The core wire is stretched and covered with a braided or twill-shaped covering body in a stretched state.
[0010]
The second expandable electric wire of the present invention has at least one core wire that can be expanded and contracted, and a braided or twill-shaped first covering body composed of a conductive wire covering the core wire, an elastic thread, and a thread. The first covering is covered with a braided or twilled second covering.
[0011]
The above-mentioned second stretchable electric wire of the present invention is as a further preferable feature,
"The core wire is formed by spirally winding two threads on the left and right around the outer periphery of a stretchable core material."
“The conductive wire is formed by twisting a plurality of enamel wires”,
including.
[0012]
Moreover, this invention is a method of manufacturing the said 2nd expansion-contraction electric wire of this invention, Comprising:
Covering the core wire with a braided or twill-shaped first covering body composed of the conductive wire, an elastic yarn, and a yarn in a state where at least one stretchable core wire is stretched;
A step of covering the core wire and the first covering body with the second covering body in the form of braid or twill;
It is characterized by having.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to such embodiments, and includes those appropriately modified within the gist of the present invention.
[0014]
First, the telescopic wire according to the first aspect of the present invention will be described.
[0015]
FIG. 1 is a schematic view showing an example of an expandable electric wire according to the first aspect of the present invention, and FIG. 2 is a sectional view thereof. In these drawings, 11 is a first core wire made of a core material 11a and a thread (string) 11b, 12 is a second core wire made of a core material 12a and a conductive wire 12b, and 13 is a covering.
[0016]
The expandable electric wire 10 of the present example has a configuration in which three second core wires 12 arranged around one first core wire 11 are collectively covered with a covering body 13.
[0017]
In the first core wire 11 of this example, two yarns 11b are spirally disposed in the reverse direction (left and right) on the outer periphery of a core material 11a made of elastic elastic yarns. It has a flexible structure.
[0018]
As the elastic yarn constituting the core material 11a, those having good elasticity recovery and strong elasticity are preferable, and those made of synthetic rubber such as natural rubber, polyurethane, silicone rubber and the like are preferable.
[0019]
The yarn 11b was manufactured using any material such as natural fibers such as cotton, hemp and silk, glass fibers, synthetic fibers such as rayon, nylon, acrylic, polyester, polypropylene and polyethylene, and super strong yarns such as aramid fibers. It may be a thing. The yarn 11b may be a single yarn, a braid, or a twisted yarn.
[0020]
Although the first core wire 11 can be composed only of an elastic yarn, the frictional force with the second core wire 12 disposed around the first core wire 11 is increased by winding the yarn 11b spirally as described above. As a whole, the stretchable electric wire can be integrated and smooth.
[0021]
In addition, when the first core wire 11 is configured by the core material 11a and the thread 11b, the configuration is not limited to this example. For example, a single thread 11b is spirally wound around the outer periphery of the core material 11a. When the core material 11a is manufactured so as not to hinder the stretchability of the core material 11a, the core material 11a may be covered with a thread 11b in a braid shape or a twill shape.
[0022]
Furthermore, the number of the first core wires 11 is not limited to one, and a plurality of the first core wires 11 can be arranged according to the number of the second core wires 12, for example.
[0023]
The second core wire 12 has two conductive wires 12b arranged in a spiral shape on the outer periphery of a core material 12a made of a stretchable elastic yarn similar to the first core wire 11 in the reverse direction (left and right). It has a configuration that can be expanded and contracted as a whole.
[0024]
As the conductive wire 12b, an insulation coated conductive wire having a desired thickness can be used according to the use of the extension wire. For example, an enameled wire obtained by coating and applying an enamel for insulation to an annealed copper wire, or a fiber surface. It is possible to use an insulation coated conductive wire or the like formed by coating a conductive metal or alloy, such as copper or nickel, which has been fixed by plating with a soft insulator, and particularly preferably an enameled wire having low plasticity. be able to. For example, when using a relatively thin (diameter of about 0.01 to 0.1 mm) enameled wire, a plurality of (for example, about 2 to 5) enameled wires are twisted, or even in the center. A wire in which a plurality of enamel wires are twisted in a state in which super strong yarns such as aramid fibers are arranged can also be used as the conductive wire 12b.
[0025]
The number of the second core wires 12 is not limited to three as in the present example, but the number of signal lines (communication lines) or the number of power transmission lines required according to the application of the telescopic wire 10 is prepared. For example, two or three telescopic wires 10 are prepared when applied to an earphone cord, and six are prepared when applied to a USB.
[0026]
The covering 13 covers the first core wire 11 and the second core wire 12 together, and has a braided or twilled structure in order to give stretchability. Here, the “braid” refers to a braid in which the strands run in a slanted manner in the length direction of the product and the strands are formed so as to cross each other. Say a round braid.
[0027]
As the strands for constructing this braided structure, those having low plasticity are preferable, natural fibers such as cotton, hemp and silk, glass fibers, rayon, nylon, acrylic, polyester, polypropylene, polyethylene and other synthetic fibers, aramid fibers, etc. It may be manufactured using any material such as super strong yarn. In addition, the strand itself may be a single yarn, or a braid or twisted yarn may be used for the strand itself. In addition, it is preferable to use the same thing for the above-mentioned thread | yarn 11b and the strands which assemble this braid structure.
[0028]
In the first telescopic electric wire of the present invention having the above-described configuration, the electric wire can be expanded and contracted with high durability not only with respect to flexibility but also with respect to elongation and twisting.
[0029]
In particular, when the elastic wire is expanded and contracted by selecting the material, thickness and number so that the longitudinal elastic modulus of the first core wire 11 is larger than the longitudinal elastic modulus of the second core wire 12, One core wire 11 serves as a guide, and the second core wire 12 does not have a bump shape, so that the entire wire can be expanded and contracted neatly. As a specific example of this, when a 1120 denier elastic yarn (trade name: spantex) made of polyurethane, for example, is used as the core material 11a of the first core wire 11, the core material 12a of the second core wire 12 is, for example, A 840 denier elastic yarn made of polyurethane (trade name: Spantex) may be used.
[0030]
When manufacturing an expandable electric wire as shown in FIG. 1, a second core wire 12 is arranged around the first core wire 11, and a braided or twill weave around the core wire is stretched. A shaped covering 13 is produced. By carrying out like this, the extension rate similar to the extension rate of the core wire 12 can be provided to the covering 13, and the integral elastic smoothness is obtained as the whole expansion-contraction electric wire.
[0031]
Next, the telescopic electric wire according to the second aspect of the present invention will be described.
[0032]
FIG. 3 is a cross-sectional view schematically showing an example of the expandable electric wire according to the second aspect of the present invention. In FIG. 3, 21 is a core wire composed of a core material 21a and a thread (string) 21b, 22 is a first covering body composed of an elastic thread 22a, a conductive wire 22b and a thread (string) 22c, and 23 is a second covering body. It is.
[0033]
The expandable electric wire 20 of the present example has a configuration in which a single cover 22 made of a single conductive wire 22 b and a thread 22 c is covered, and the outer periphery is covered with a second cover 23.
[0034]
The configuration of the core wire 21 can be the same as the configuration of the first core wire 11 of the expandable electric wire according to the first aspect of the present invention described above.
[0035]
The first covering 22 covers the core wire 21 and has a braided or twill-like structure composed of elastic yarns 22a, conductive wires 22b, and yarns 22c in order to give stretchability. .
[0036]
The elastic yarn 22a is preferably one having good elasticity recovery and strong elasticity, and for example, one made of synthetic rubber such as natural rubber, polyurethane, silicone rubber or the like is suitable.
[0037]
As the conductive wire 22b and the thread 22c, those similar to the conductive line 12b and the thread 11b of the telescopic wire according to the first aspect of the present invention can be used, respectively.
[0038]
In this example, the first covering body 22 is configured by using three elastic yarns 22a, conductive wires 22b, and yarns 22c, respectively, but the number of these is not limited to this and may be changed as appropriate. be able to. For example, as many conductive lines 22b as the number of necessary signal lines (communication lines) or power transmission lines are prepared according to the use of the telescopic electric wire 20.
[0039]
The second covering body 23 covers the outer periphery of the first covering body 22 and has a braided or twilled structure in order to give stretchability.
[0040]
As the strands for assembling the braid structure or the twill weave structure, those having low plasticity are preferable, and the same strands as the strands constituting the covering body 13 of the stretchable wire according to the first aspect of the present invention can be used.
[0041]
In the second telescopic electric wire of the present invention having the above-described configuration, the electric wire can be expanded and contracted with high durability not only with respect to flexibility but also with respect to elongation and twisting. In particular, by selecting the material and the thickness so that the longitudinal elastic modulus of the core wire 21 is larger than the longitudinal elastic modulus of the first covering 22, the core wire 21 can be used as a guide when the telescopic wire is expanded and contracted. Thus, the first covering 22 does not have a bump-like shape, and the entire electric wire can be expanded and contracted neatly without unevenness.
[0042]
When manufacturing an expandable electric wire as shown in FIG. 3, a braided or twill-shaped first covering 22 is produced around the core wire 21 in a stretched state. A second covering body 23 in the form of braid or twill is produced around the covering body 22 in a stretched state. By carrying out like this, the elongation rate similar to the elongation rate of the core wire 21 can be provided to the 1st coating body 22 and the 2nd coating body 23, and integral and smooth elasticity is obtained as the whole expansion-contraction electric wire. .
[0043]
In the first and second elastic wires of the present invention described above, the elastic yarn preferably has an elongation rate of 10% or more, and particularly preferably has an elongation rate of 20% or more. If the elongation ratio is less than 10%, it is difficult to sufficiently obtain the effects of the present invention.
[0044]
The expandable electric wire of the present invention is extremely useful as a signal line (communication line) or a power transmission line of a product that is easily subjected to repeated expansion and contraction, as well as the above-described earphone cord and USB. -It can be applied as electric wires for knitting to signal lines (communication lines) or power transmission lines of electronic products, and clothing with electronic equipment.
[0045]
【The invention's effect】
According to the stretchable electric wire and the manufacturing method thereof of the present invention described above, it is possible to obtain a stretchable electric wire that is not only flexible with respect to bending but also highly durable against elongation and twisting, such as an earphone cord or a USB signal line. It can be applied with high reliability as a single unit, an electronic wand, a signal line of a foldable electronic / electric product, a signal line for knitting into clothing with electronic equipment, and the like.
[0046]
In addition, there is a possibility that the stretchable wire of the present invention can be applied to a part that could only be handled wirelessly in the past, and in such a case, it is less susceptible to noise and more reliable communication. Is realized.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an example of an expandable electric wire according to the first aspect of the present invention.
FIG. 2 is a cross-sectional view of the telescopic wire of FIG.
FIG. 3 is a cross-sectional view showing an example of an expandable electric wire according to the second aspect of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Telescopic electric wire 11 1st core wire 11a Core material 11b of 1st core wire Thread (string)
12 Second core wire 12a Core material 12b of second core wire Conductive wire 13 Cover body 20 Stretchable electric wire 21 Core wire 21a Core material 21b Thread (string)
22 1st covering body 22a Elastic thread 22b Conductive wire 22c Thread (string)
23 Second covering

Claims (10)

There are at least one first core wire that can be stretched and a plurality of second core wires that are arranged around the first core wire and are provided with conductive wires on the outer periphery of the stretchable core member. An expandable electric wire, wherein the first and second core wires are collectively covered with a braided or twill-shaped covering. The stretchable electric wire according to claim 1, wherein a longitudinal elastic modulus of the first core wire is larger than a longitudinal elastic modulus of the second core wire. The expandable electric wire according to claim 1, wherein the first core wire is formed by spirally winding two threads on the outer periphery of a stretchable core material on the left and right. 4. The second core wire according to claim 1, wherein a conductive wire formed by twisting a plurality of enamel wires around the outer periphery of a stretchable core material is spirally wound around two strips on the left and right. The expandable electric wire according to any one of the above. The expandable electric wire according to claim 4, wherein the conductive wire is formed by twisting a plurality of enamel wires. 6. The method of manufacturing an expandable electric wire according to claim 1, wherein a conductive wire is arranged around the at least one stretchable first core wire and on an outer periphery of the stretchable core member. A step of arranging a plurality of second core wires formed, and covering the first and second core wires together with a braided or twill-shaped covering in a stretched state. A method for producing a stretchable electric wire. And at least one core wire that is stretchable, and a first covering body in a braided or twilled shape composed of a conductive wire that covers the core wire, an elastic thread, and a thread, and the first covering body A stretchable electric wire, characterized in that is covered with a braided or twilled second covering. The expandable electric wire according to claim 7, wherein the core wire is formed by spirally winding two threads on the left and right around the outer periphery of a stretchable core material. The expandable electric wire according to claim 7 or 8, wherein the conductive wire is formed by twisting a plurality of enamel wires. A method for producing an expandable electric wire according to any one of claims 7 to 9,
A step of covering the core wire with a braided or twill-shaped first covering body composed of the conductive wire, an elastic yarn, and a yarn in a state where at least one stretchable core wire is stretched;
A step of covering the core wire and the first covering body with the second covering body in the form of braid or twill;
The manufacturing method of the expansion-contraction electric wire characterized by having.

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