JP2013041784A - Optical/metal composite drop cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical/metal composite cable in which an optical fiber cable, a metal wire cable and a supporting wire are arranged side-by-side in a row, coated collectively and compounded so as to equalize the thickness of cable, and then they can be wound around a drum while being arranged in layer.SOLUTION: An optical fiber cable 11, a metal wire cable 12 and a supporting wire 13 are coated integrally with a synthetic resin material via a splittable neck 22 thus forming an optical/metal composite cable. Tension members 15 on both sides of the optical fiber core wire 14 of the optical fiber cable 11 are disposed on a line Y orthogonal to a line X passing through the center of the optical fiber cable, the metal wire cable and the supporting wire. The tension members 15 of the optical fiber cable 11 are flexible and preferably consist of tensile strength fibers.

Description

  The present invention relates to an optical / metal composite drop cable including an optical fiber cable, a metal wire cable, and a support wire.

  With the expansion of the information and communication network, optical fiber cables are laid in each home in addition to conventional metal wire cables, and optical communication using optical fibers can be selected in addition to electrical communication using metal wires. ing. The metal wire and optical fiber to each house are pulled down from the trunk metal communication cable and optical communication cable laid on the utility pole etc. using a drop cable etc., but to pull down the metal wire and optical fiber individually. It is not preferable in terms of cost and appearance.

  Therefore, for example, Patent Document 1 discloses a composite drop cable for dropping, in which an optical fiber cable, a metal wire cable, and a support wire are formed by collective coating with a synthetic resin material via a splittable neck portion. . In addition to this (for example, see Patent Documents 2 and 3), there is known a composite indoor cable for indoor wiring in which an optical fiber cable and a metal wire cable are collectively covered via a separable neck.

JP 2005-150059 A JP 2003-331658 A JP 2008-117619 A

  As a drop cable for dropping an optical fiber or a metal wire from an aerial cable, a self-supporting type provided with a support wire is often used as disclosed in Patent Document 1. However, in Patent Document 1, since the optical fiber cable, the metal wire cable, and the support wire are connected via the Y-shaped neck portion, the entire outer shape becomes a triangular shape, so that it is wound around the drum. However, it is difficult to continuously manufacture long cables.

  Therefore, as shown in Patent Documents 2 and 3, for example, a configuration is conceivable in which an optical fiber cable, a metal wire cable, and a support wire are connected via a separable neck portion in a line. However, in this case as well, the cross-sectional outer shape of the metal wire cable is usually relatively large, and a step is generated between the optical fiber cable and the external size of the optical fiber cable that is limited due to the connection with the optical connector. For this reason, since the thickness as an optical / metal composite cable is not uniform, it cannot be wound in a layered manner on a winding drum, and there is a problem that stability is poor.

  The present invention has been made in view of the above-described actual situation, and is a shape in which an optical fiber cable, a metal wire cable, and a support wire are arranged in a line and combined by batch coating, the cable thickness is uniformed, An object of the present invention is to provide an optical / metal composite cable that can be wound in an aligned manner.

  The optical / metal composite cable according to the present invention is an optical / metal composite cable in which an optical fiber cable, a metal wire cable, and a support wire are formed by a collective covering with a synthetic resin material via a neck portion that can be divided. The tension members on both sides of the optical fiber core of the optical fiber cable are arranged on a line orthogonal to the line passing through the center of the optical fiber cable, the metal wire cable, and the support wire. .

  It is preferable that the tension member of the optical fiber cable is extendable and is made of, for example, a tensile fiber. Further, it is preferable that the tension member has a surplus length with respect to the collective coating with the synthetic resin material and is fixed intermittently with respect to the collective coating with the synthetic resin material, for example. In addition, an aramid fiber can be used for the tensile strength fiber.

  According to the present invention, it is possible to attach an optical fiber cable as usual, and it is possible to make the thickness as a composite cable of an optical fiber cable, a metal wire cable, and a support wire uniform, and a production line The drum can be wound on the drum in a stable state aligned in layers.

It is a figure explaining the usage condition of the optical and metal composite cable by this invention. It is a figure explaining an example of the optical and metal composite cable by this invention. It is a figure explaining the other example of the optical and metal composite cable by this invention. It is a figure explaining the comparative example of this invention.

  Embodiments of the present invention will be described with reference to the drawings. In the figure, 1 is a utility pole, 2 is an optical communication cable, 3 is an electrical communication cable, 4 is a closure, 5 is a drop cable, 6 is a cable body, 7 is a support line, 8 is a terminal board, and 10 is optical / metal. Composite cable, 11 is an optical fiber cable, 12 is a metal wire cable, 13 is a support wire, 14 is an optical fiber core wire, 15 is a tension member, 16 is an optical fiber cable jacket, 16a and 16b are side surfaces, and 17 is a notch. , 18 is an insulated wire, 19 is a metal wire cable jacket, 19a is a side surface, 20 is a steel wire, 21 is a protective coating, and 22 is a connecting neck.

  As shown in FIG. 1, the optical communication cable 2 and the electric communication cable 3 installed overhead using the utility pole 1 or the like are branched by a closure 4 or the like and pulled down to each door using a drop cable 5. The drop cable 5 is usually of a self-supporting type having a support wire portion 7, and the cable main body 6 covering the optical fiber and the metal wire branched from the optical communication cable 2 or the telecommunication cable 3 is loosened. Will be withdrawn in support of not. In some cases, the holding position of the support wire is different from the position of the terminal board 8 of the optical fiber cable or the metal wire cable, and the cable body 6 and the support wire 7 are formed to be separable.

When pulling down both optical fiber and metal wire, support wires, optical fiber cables and metal wire cables are arranged in series as drop cables to reduce the cost of laying work, etc., and covered together via a separable connection neck An optical / metal composite cable can be considered.
FIG. 2 is a diagram showing an example of the optical / metal composite cable 10, in which the optical fiber cable 11 and the metal wire cable 12 are integrated via the connection neck portion 22, and the support wire 13 similarly has the connection neck portion 22. It is integrated and configured.

  The pull-down optical fiber cable 11 is formed by placing tension members 15 on both sides so as to sandwich the optical fiber core 14 and covering with a cable jacket 16 having a rectangular cross section. A structure provided with a notch 17 for facilitating is common. The metal wire cable 12 is also formed, for example, by twisting a pair of insulated wires 18 and covering them with a cable jacket 19 having a rectangular cross section. The support wire 13 is formed by covering a tensile strength wire 20 such as a steel wire with a protective coating 21.

  The cable jacket 16 of the optical fiber cable 11, the cable jacket 19 of the metal wire cable 12, and the protective coating 21 of the support wire 13 are simultaneously formed by extrusion molding using the same synthetic resin material (for example, flame-retardant polyethylene), and the connection neck portion The shape is collectively covered via 22. The connecting neck portion 22 is formed to have a narrow width that can be easily cut, and the support wire 13 is separated from both ends of the optical fiber cable 11 and fixed to the structure. The optical fiber cable 11 and the metal wire cable 12 are also separated at the terminal portion and connected to the respective connectors and terminal portions.

  In the present invention, the tension member 15 disposed so as to sandwich both sides of the optical fiber core wire 14 of the optical fiber cable 11 in the optical / metal composite cable 10 configured as described above is provided with the optical fiber cable 11, The optical fiber cable 11 is connected so as to be positioned on a line Y orthogonal to the line X passing through the centers of the metal wire cable 12 and the support wire 13.

  As a comparative example of the present invention, as shown in FIG. 4, the tension member 15 arranged so as to sandwich both sides of the optical fiber core wire 14 is the center of the optical fiber cable 11, the metal wire cable 12, and the support wire 13. A configuration in which the optical fiber cable 11 is connected so as to be located on a line X passing through the line is also assumed. However, the cable jacket 16 of the pulling optical fiber cable 11 is usually smaller in outer diameter than the cable jacket 19 of the metal wire cable 12, and particularly in the thickness direction between the side surfaces 16 a where the notches 17 are provided. The dimension W is small.

For this reason, in the case of FIG. 4, a step is generated between the side surface 16 a in the thickness direction of the optical fiber cable 11 and the side surface 19 a in the thickness direction of the metal wire cable 12. Note that the thickness of the support wire 13 can be adjusted to the outer shape of the metal wire cable 12 by adjusting the thickness of the protective coating 21.
If there is a step in the thickness direction between the optical fiber cable 11 and the metal wire cable 12, winding with the bobbin cannot be performed smoothly, and the winding state is disturbed.

  Therefore, it is conceivable to increase the dimension in the thickness direction of the cable jacket 16 of the optical fiber cable 11 as shown by the dotted line so as to be the same as the dimension of the cable jacket 19 of the metal wire cable 12. However, the optical fiber cable 11 has a shape having the cable jacket 16 and may be connected to an optical connector or an optical terminal. In this case, if the optical fiber cable 11 has the same outer dimensions as the metal wire cable 12, it becomes difficult to apply to the current optical connector and terminal device, and tools must be newly recreated.

  In the present invention, as described above, the line Y passing through the tension members 15 on both sides of the optical fiber core 12 is orthogonal to the line X passing through the centers of the optical fiber cable 11, the metal wire cable 12 and the support wire 13. . That is, as shown in FIG. 2, the narrow side surface 16a of the optical fiber cable 11 is set to be orthogonal to the line X. As a result, the dimension W between the side surfaces 16a can be set to the same value as that of a normal optical fiber cable for pulling out, and can be applied to a current optical connector or terminal device.

  By setting it as said structure, the side surface 16b side orthogonal to the side surface 16a turns into a side surface along with the side surface 19a of the metal wire cable 12. FIG. However, since the side surface 16b side is usually formed with a size larger than that of the side surface 16a side, it can be easily matched with the side surface 19a of the metal wire cable 12, and can be aligned with the outer shape of the metal wire cable 12 by a slight thickness adjustment. Is possible. As a result, it is possible to eliminate difficulties and disturbances in winding, and it is possible to perform stable winding by arranging the bobbins in layers.

  However, when the composite cable 10 is wound with a bobbin, in the optical fiber cable 11, a compressive stress is generated in the tension member 15 inside the winding, and a tensile stress is generated in the outer tension member 15. Therefore, it is desirable that the tension member 15 is provided with a stretchability capable of responding to the compression and tension. This allows bending with a small diameter and facilitates winding onto the bobbin.

  Tensile fibers can be used as tension members having elasticity. The tensile strength fibers can be arranged in a cable jacket 16 made of a synthetic resin, usually in the form of a bundle of thin high tension fibers or a twisted string. Moreover, it is preferable that the tension member made of the tensile strength fiber is disposed in the cable jacket 16 in a form having an extra length. In addition, as a method of giving a surplus length to the tension member made of the tensile strength fiber, it is easily performed by adjusting a pulling balance of the synthetic resin material for molding with respect to the tensile strength fiber at a drawing port at the time of extrusion molding of the cable jacket. be able to.

  In addition, in order to give the tension member made of the tensile strength fiber an extra length and at the same time, the tensile strength fiber needs to be fixed to the cable jacket in order to perform the function as the tension member. For this reason, it is preferable that the tension member made of the tensile strength fiber is intermittently fixed to the cable jacket intermittently. In addition, as a method of intermittently fixing the tension member to the cable jacket, for example, when the tension member is fed into the cable jacket extrusion machine, the adhesive has an adhesive property with the cable jacket intermittently. Can be realized. As the tensile strength fiber, a commercially available aramid fiber that is inexpensive in cost can be used, and about 1500 to 2000 denier is used for one tension member.

  Each of the optical fiber cable 11, the metal wire cable 12, and the support wire 13 is divided by cutting the connection neck portion 22 at both ends of the cable, and both ends of the support wire 13 are secured by using a structure. The optical fiber cable 11 and the metal wire cable 12 are branched and connected at one end to an aerial laid cable in the closure, and the other end is laid indoors as an indoor cable, or a terminal Connected to the panel.

  FIG. 3 is a diagram showing another embodiment. FIG. 3A shows an example in which the support wire 13 is connected to the side of the metal wire cable 12 connected to the optical fiber cable 11, and FIG. This is an example in which a support wire 13 is connected between an optical fiber cable 11 and a metal wire cable 12. FIG. 3C shows an example in which the cable jacket of the metal wire cable 12 is circular.

  There is no restriction | limiting in particular about the connection order of the optical fiber cable 11, the metal wire cable 12, and the support line 13, and a connection order can be suitably changed like FIG. 3 (A) or FIG. 3 (B). Moreover, the number of the optical fiber core wires 14 of the optical fiber cable 11 may be two or four. However, when a plurality of optical fiber core wires 14 are used, it is preferable that they are arranged so as to be concentrically assembled at the center of the cable. Further, as shown in FIG. 3C, the metal wire cable 12 may have a circular outer shape, and the number of the insulated wires 18 is not limited to two, and may be three or more.

DESCRIPTION OF SYMBOLS 1 ... Telephone pole, 2 ... Optical communication cable, 3 ... Electrical communication cable, 4 ... Closure, 5 ... Drop cable, 6 ... Cable main-body part, 7 ... Support wire part, 8 ... Terminal board, 10 ... Optical / metal compound cable, DESCRIPTION OF SYMBOLS 11 ... Optical fiber cable, 12 ... Metal wire cable, 13 ... Support line, 14 ... Optical fiber core wire, 15 ... Tension member, 16 ... Optical fiber cable jacket, 16a, 16b ... Side, 17 ... Notch, 18 ... Insulated wires, 19 ... Metal wire cable jacket, 19a ... Side, 20 ... Steel wire, 21 ... Protective coating, 22 ... Connection neck.

Claims (6)

An optical / metal composite cable in which an optical fiber cable, a metal wire cable, and a support wire are formed by a collective coating with a synthetic resin material through a splittable neck,
The tension members on both sides sandwiching the optical fiber core of the optical fiber cable are arranged on a line orthogonal to a line passing through the center of the optical fiber cable, the metal wire cable, and the support wire. Optical and metal composite cable.   The optical / metal composite cable according to claim 1, wherein the tension member is extendable and contractible.   The optical / metal composite cable according to claim 2, wherein the tension member is made of a tensile strength fiber.   The optical / metal composite cable according to claim 3, wherein the tension member has a surplus length with respect to the collective covering with the synthetic resin material.   5. The optical / metal composite cable according to claim 3, wherein the tension member is intermittently fixed to the batch covering with the synthetic resin material.   The optical / metal composite cable according to claim 3, wherein the tensile strength fiber is an aramid fiber.

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