JP3155272U - Composite cable - Google Patents

Abstract

The present invention provides a composite cable capable of reducing the diameter, having high flexibility and good workability. A round optical fiber, a metal twisted pair, and a sheath material are provided. The optical fiber 15 is a composite cable 1 in which an optical fiber core wire and a tension member are covered with a sheath 17 and a notch groove extending in the longitudinal direction is formed on the outer surface of the sheath. And the outer diameter of an optical fiber wire is made substantially the same as the twisted wire diameter of the metal pair twisted wires 11, 12, 13, and 14. As a result, the outer diameter of the composite cable is reduced, and the flexibility of the composite cable as a whole is increased. The manufacturing process of the composite cable can be simplified. [Selection] Figure 1

Description

  The present invention relates to a composite cable, and more particularly, to a composite cable in which an optical fiber and a metal pair stranded wire (electric wire) or a power wire are collectively covered with a sheath material.

Conventionally, as this type of composite cable, the one shown in FIG. 5 is known. This composite cable 51 is configured by arranging five metal pair stranded wires 52 around a slot-type optical cable portion and covering them with a sheath 54 via a press-wrapping tape 53. The optical cable portion is inserted into a slot forming body 56 having a tension member 55 inserted in the center thereof, a plurality of slots (longitudinal narrow grooves) formed on the outer peripheral surface of the slot forming body 56, and the slots. And a plurality of optical fiber core wires 57. The slot forming body 56 is covered with an inner sheath 58.
Further, as shown in FIG. 6, a composite cable 61 in which the optical cable portion is a cord type is also known. In other words, the composite cable 61 is configured such that a tension member 62 is arranged at the center, a plurality of optical fiber cords 63 are disposed around the tension member 62, and these are covered with an inner sheath 64. In the same manner as described above, a plurality of metal pairs 65 are disposed on the outer periphery of the inner sheath 64 and covered with a sheath material 67 via a tape 66. In each optical fiber cord 63 in this case, the optical fiber core wire is covered with an aramid fiber and further covered with a sheath.

In the former, after inserting an optical fiber core wire into each slot, and integrating it by extrusion molding of the inner sheath, on the other hand, a plurality of pairs of metal pairs are prepared, and the optical fiber portion A plurality of these metal pair twisted wires are arranged and assembled on the outer periphery of the wire, and then a slot-type composite cable is manufactured by sheath extrusion.
In the latter case, each optical fiber cord is first extruded, and then the optical fiber cords are assembled and extruded using an inner sheath. Also, a composite cable is manufactured by assembling a plurality of separately produced metal pair stranded wires and an assembly of the optical fiber cords and performing sheath extrusion.

  However, in such a conventional composite cable, since a plurality of metal pairs are disposed around a large-diameter optical fiber portion having a central strength member (tension member), the composite cable itself The diameter was also increased. Moreover, the flexibility of the composite cable itself was inferior due to the tension member. Furthermore, since it is inferior in flexibility, workability in a narrow closure has been difficult. Furthermore, the manufacturing process of the slot type optical fiber (extrusion) and the manufacturing process of the cord type optical fiber (extrusion) are required before the compounding, and the manufacturing process of the composite cable is complicated as a whole.

Therefore, the inventor has found out that these problems can be eliminated by collectively covering the optical fiber and the metal pair stranded wire or the power line with the sheath material, and has completed this device.
In addition, we found out that these problems can be eliminated by using a round optical fiber with a true circular cross section and making the round optical fiber and the metal twisted wire substantially the same diameter. This idea was completed.

  An object of the present invention is to provide a composite cable that can be reduced in diameter, highly flexible, and has good workability. Moreover, this invention aims at providing the composite cable which can simplify the manufacturing process.

  The device according to claim 1 is one or a plurality of metal pair stranded wires or one or a plurality of metal pairs formed by twisting one or a plurality of optical fibers having a substantially circular cross section and two stranded wires. Or a plurality of power lines, and a sheath material that collectively covers only the optical fiber and the metal pair stranded wire or the power line, and the optical fiber includes an optical fiber core and a tension member that are covered by a sheath. In addition, this is a composite cable in which a cutout groove extending in the longitudinal direction is formed on the outer surface of the sheath.

  According to the first aspect of the invention, the tension member is used to collectively cover only the optical fiber and the metal pair stranded wire with the sheath material, or to collectively cover only the optical fiber and the power line with the sheath material. Is unnecessary, and the outer diameter of the composite cable can be made smaller than before. In addition, according to this device, since the composite cable can be manufactured by the sheath extrusion process after the composite assembly process after the optical fiber element extrusion process and the metal pair stranded wire manufacturing process, the manufacturing process is conventionally performed. Can be less.

  The invention described in claim 2 includes one or a plurality of optical fibers having a substantially circular cross section, and one or a plurality of metal pair stranded wires formed by twisting two stranded wires, A composite cable comprising a sheath material that collectively covers these optical fibers and metal twisted wires, wherein the diameter of the optical fiber is substantially equal to the diameter formed by the two twisted wires of the metal twisted wires. The composite cable is the same as The cross section is substantially circular when the cross section is a perfect circle and when a notch (notch groove) is formed in the perfect circle, but when the outer shape excluding the notch forms a perfect circle, the cross section is an ellipse. It is meant to include those showing a shape but showing bending properties equivalent to the case of a perfect circle. Moreover, the diameters being substantially the same means that the maximum diameter of the cross section (assuming a perfect circle) formed by two twisted wires twisted together is the same in an undeformed state. .

  According to the invention described in claim 2, since the optical fiber covered with the sheath material has a substantially circular cross section, there is no difficulty in bending in a specific direction, and bending in all directions can be performed. It also has the same bending characteristics. As a result, there is no room for difficulty in bending in a specific direction as a whole of the composite cable, and for example, the possibility that troubles may occur in work in a narrow closure is reduced. Further, since no special tension member is required, the outer diameter of the composite cable itself can be made considerably smaller than that of a conventional composite cable with a tension member.

  According to a third aspect of the present invention, the optical fiber has two notch grooves extending in the longitudinal direction on the outer surface at two positions spaced apart from each other by 180 degrees in the circumferential direction, and separated by these notch grooves. 3. The composite cable according to claim 2, wherein a tension member is disposed at each center of the substantially semicircular cross section, and an optical fiber core wire is disposed between the cutout grooves.

  According to the invention described in claim 3, since the optical fiber having a circular cross section has two cutout grooves at symmetrical positions on the outer surface, the optical fiber can be easily split into two parts. Can do. As a result, this can be easily achieved when the optical fiber formed by the notch groove is split into two, and the flexibility of the entire composite cable can be enhanced.

  According to the first aspect of the present invention, the optical fiber can be easily split and divided by the notch groove, and workability such as connection can be improved. Further, the outer diameter of the composite cable itself can be reduced. Furthermore, the manufacturing process of a composite cable can be simplified compared with the past.

  According to the device of the second aspect, the outer diameter of the composite cable can be reduced. Moreover, the bendability of the composite cable itself can be improved, and the workability in a narrow closure can be improved. In addition, the manufacturing process can be simplified.

  According to the third aspect of the invention, the entire composite cable can be further easily bent. In addition, workability in connection of optical fibers can be improved.

It is sectional drawing which shows the composite cable which concerns on one Example of this device. It is sectional drawing which shows an example of the optical fiber which concerns on one Example of this device. It is sectional drawing which shows the other example of the optical fiber which concerns on one Example of this invention. It is sectional drawing which shows the composite cable which concerns on the other Example of this invention. It is sectional drawing which shows the conventional composite cable. It is sectional drawing which shows the other conventional composite cable.

  Embodiments of the composite cable according to the present invention will be specifically described below with reference to the drawings.

A composite cable according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a sectional view showing a composite cable according to an embodiment of the present invention. In this figure, 1 indicates a composite cable. The composite cable 1 includes four metal pair stranded wires 11, 12, 13, and 14 having the same configuration, and one round optical element (optical fiber) 15. The four metal pair stranded wires 11 to 14 are obtained by twisting two metal wires 41 and 42 having the same diameter, and the stranded wire diameter is the outer diameter of the round optical element (optical fiber) 15 (see FIG. The middle wave line shows the outer shape of the stranded wire). Each of the metal wires 41 and 42 is obtained by coating a single core wire such as copper or aluminum with an insulating covering such as PE. These five cables or wires (11 to 15) having the same diameter are collectively covered with a sheath 17 made of an insulating material having a predetermined thickness via a press-wound tape (insulating material) 16. Further, as shown in FIG. 2, the optical fiber 15 has a substantially circular cross section, and has a wedge-shaped notch (notch groove) 18 having a predetermined depth at an outer peripheral position separated by 180 degrees. It extends along the longitudinal direction of the line. Two optical fiber strands (optical fiber core wires) 21 are embedded side by side in the center of the optical fiber 15 sandwiched between the notches 18. Further, tension members 23 for optical fibers such as FRP and steel wire are embedded in the left and right semicircular cross sections of the optical fiber sheath 22 divided into two by the notch 18. The optical fiber 15 can be easily split by the pair of upper and lower notches 18 and the sheath 22 can be divided into two.
FIG. 3 shows a single-fiber optical fiber 25 which is another example of the optical fiber. In this composite cable 1, this type of single-fiber optical fiber 25 is connected to the two-fiber optical fiber. It can also be used instead of 15. This single-core optical fiber 25 is obtained by embedding one optical fiber core wire 21 between a pair of upper and lower notches 18. Other configurations are formed in a perfect circular cross section equivalent to the two-core optical fiber 15.

In the composite cable 1 having the above configuration, the optical element (optical fiber) 15 is first extruded by a normal method. Moreover, the metal pair twisted wires 11-14 are prepared by a well-known method. Next, one optical element 15 and four metal pairs stranded wires 11 to 14 are combined. They are gathered and bundled by the tape 16. Then, the gathered five wires (11 to 15) having the same diameter are collectively covered with a sheath material 17 such as PE by sheath extrusion. In this way, the composite cable 1 is manufactured.
Since all of the five lines (11 to 15) have the same diameter, their positions are unspecified and can be freely arranged. In addition, since the tension member is not arranged inside the sheath, the composite cable 1 itself can be easily bent, and the connection work between the wirings accompanied by bending with a narrow closure or the like can be performed satisfactorily. The workability is greatly improved.
Moreover, in this Example, although the metal pair twisted wire was used, a power line can also be used.

Next, a composite cable according to another embodiment of the present invention will be described with reference to FIG.
In this embodiment, eight metal pair stranded wires 31 and two optical elements 32 are assembled to form a composite cable 30. In this embodiment, the outer diameter of the round optical element 32 and the stranded wire diameter of the metal pair stranded wire 31 are the same. As a result, in the composite cable 30 collectively covered with the sheath material 33, the outer diameter can be reduced and the bending characteristics can be enhanced.
Since other configurations and operations are the same as those in the above embodiment, the description thereof is omitted.
Note that the outer diameter of the composite cable in these embodiments can be reduced by about 20% compared to the conventional slot-type and cord-type composite cables. Furthermore, even in the operation of storing and connecting in the closure using the composite cable according to these embodiments, it is possible to prevent a mechanical shock from being directly transmitted to the optical fiber itself. Further, when bending the composite cable, it is not necessary to consider the ease and non-easyness of bending in a specific direction, and the bending workability is improved.

1 Composite cable,
11-14 Metal pair stranded wire,
15 optical fiber,
17 sheath material,
18 notches (notch grooves),
21 Optical fiber core.

Claims (3)

One or more optical fibers having a substantially circular cross section;
One or more metal pair stranded wires or one or more power lines configured by twisting two stranded wires; and
A sheath material that collectively covers only the optical fiber and the metal pair stranded wire or power line,
The optical fiber is a composite cable in which an optical fiber core wire and a tension member are covered with a sheath, and a cutout groove extending in a longitudinal direction is formed on an outer surface of the sheath. One or more optical fibers having a substantially circular cross section;
One or more metal pair stranded wires composed of two stranded wires twisted together;
A composite cable provided with a sheath material that collectively coats these optical fibers and metal pairs,
A composite cable in which the diameter of the optical fiber is substantially the same as the diameter of the metal pair stranded wire.   The optical fiber has two cutout grooves extending in the longitudinal direction on the outer surface at two positions that are 180 degrees apart from each other in the circumferential direction, and tension is provided at each center of the semicircular cross section separated by the cutout grooves. The composite cable according to claim 2, wherein members are disposed, and an optical fiber core wire is disposed between the cutout grooves.

Images