JP2007041337A - Coated cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated cable suppressing oviposition of cicadas, extending the service life of a cable, and improving reliability. <P>SOLUTION: The coated cable is equipped with coated optical fibers 2, tension members 3 arranged on both sides of and in parallel to the coated optical fibers 2, a support line 4 disposed on the outer side of the tension member, and a coating material 5 composed of a resin covering the foregoing and provided with a flat face parallel to the optical fibers 2 on the outer circumference, wherein a groove 5d is formed longitudinally along the coated optical fibers 2 on the surface of the coating material 5. The coated cable is characterized in that, when it is cut in the radial direction of the coated optical fibers 2, a line connecting the center of the opening of the groove 5d and the center of its bottom is not orthogonally crossing a plane including the coated optical fibers 2 and the tension members 3 or that, when the groove is projected in the direction orthogonally crossing the plane including the coated optical fibers and the tension members, the opening and the bottom of the groove 5d are not superposed on each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drop cable that draws an optical fiber from a covered cable, particularly an overhead wiring type optical fiber cable to each user's home.

As shown in FIG. 5 as a radial cross-sectional view, the drop cable is generally made of an optical fiber 22, a tension member 23 disposed on both sides of the core to protect the thin core, and a steel made to support the weight of the cable. It consists of a thick support line 24 and a covering material 25 made of a resin covering them. Since the drop cable 21 is wound and stored in a coil shape before use, the outline of the covering material 25 is formed so that the plane parallel to the plane including the core wire 22 and the tension member 23 is almost flat in order to wind the drop cable 21 at a high density. Has been. The optical fiber core wire 22 is taken out by manually tearing the covering material 25 at the end of the cable, and is connected to the terminal at the user's home. Therefore, in order to facilitate the tearing, grooves 25d having a V-shaped radial cross section are formed along the core wire 22 on both surfaces of the covering material 25.
JP 2005-121749 A

However, in late summer, it has been found that cocoons lay eggs in the grooves 25d, and the covering material 25 is often cracked by an oviposition tube such as a needle. The crack in the covering material 25 deteriorates the characteristics of the core wire 22 and causes a situation where the cable 21 must be replaced.
Therefore, an object of the present invention is to provide a covered cable in which a cocoon is unlikely to lay eggs.

In order to solve the problem, the coated cable of the present invention is
A core wire, a tension member arranged in parallel to the core wire, and a coating material made of resin covering them, and a groove is formed in the longitudinal direction along the core wire on the surface of the coating material In
When cut in the radial direction of the core wire, a straight line connecting the opening center and the bottom center of the groove is not perpendicular to the plane including the core wire and the tension member.

  The reason why spiders lay eggs in the groove is not clear, but when the spawning tube is inserted straight, the spawning tube reaches the bottom of the groove, and both inner surfaces of the groove keep the egg warm and protect it from external enemies. And the like. On the other hand, when the cable is drawn into the user's home, the surface including the core wire and the tension member is laid along the attachment surface such as a wall. Therefore, by adopting a cable structure in which the straight line connecting the center of the opening of the groove and the center of the bottom is not orthogonal to the surface, the groove is inclined with respect to the mounting surface in a radial sectional view. As a result, even if the spider puts the egg-laying tube straight, the tip does not reach the bottom, or it becomes difficult for the spear to insert the egg-laying tube all the way, making it difficult to spawn.

So, if you look at the coated cable of this invention from another aspect,
A core wire, a tension member arranged in parallel to the core wire, and a coating material made of resin covering them, and a groove is formed in the longitudinal direction along the core wire on the surface of the coating material In
When the groove is projected in a direction perpendicular to the plane including the core wire and the tension member, the opening and bottom of the groove do not overlap.

Moreover, if the covered cable of this invention is seen from another aspect,
In a core wire and a covering material comprising a resin covering the core wire and having a plane parallel to the core wire on the outer periphery, and grooves are formed in the longitudinal direction along the core wire on the surface,
When cut in the radial direction of the core wire, a straight line connecting the opening center and the bottom center of the groove is not perpendicular to the plane.
As described above, in the case of a cable in which a flat surface parallel to the core wire is formed on the outer periphery of the covering material, the cable is wound so that the surface abuts on the attachment surface. Therefore, even in such a case, by adopting a cable structure in which the straight line connecting the opening center and the bottom center of the groove is not orthogonal to the surface, the groove is inclined with respect to the mounting surface in a radial sectional view.

Therefore, if the coated cable of the present invention is viewed from another aspect,
In a core wire and a covering material comprising a resin covering the core wire and having a plane parallel to the core wire on the outer periphery, and grooves are formed in the longitudinal direction along the core wire on the surface,
When the groove is projected in a direction perpendicular to the surface, the opening and the bottom of the groove do not overlap.

  Since spawning of moths is suppressed, the life of the cable is extended and the reliability is improved.

Embodiment 1
1 is a front view showing a covered cable according to a first embodiment of the present invention, FIG. 2 is a rear view of the same, and FIG. 3 is a cross-sectional view taken along line AA in FIG. The sheathed cable 1 includes two optical fiber cores 2 and 2, tension members 3 and 3 disposed on both sides of the core 2 to protect the thin core 2, and a thick steel support that supports the weight of the cable 1 It consists of the wire | line 4 and the coating | covering material 5 which consists of resin which coat | covers these.

  The covering material 5 is divided into a core wire element portion 5a that covers the core wire 2 and the tension member 3, and a support wire element portion 5b that covers the support wire 4, and these are connected via a thin connection portion 5c. ing. The core wire element portion 5a has a long cross-sectional rectangle centering on the core wires 2 and 2 and basically in the direction of a straight line connecting the tension members 3 and 3. And the groove | channel 5d is cut | disconnected from the one ridge angle and the opposite ridge angle toward the core wire 2, respectively. The two grooves 5d bend before reaching the core wire 2 and are parallel to each other. The two grooves 5d face each other with the core wire 2 interposed therebetween, and the position of the core wire 2 farther from the ridge angle is the deepest. The support line element portion 5 b has a contour that is concentric with the support line 4.

  The covering material 5 includes an inner mold in which axial through holes corresponding to the core wire 2, the tension member 3, and the support wire 4 are formed, and an axial through hole having a cross-sectional shape corresponding to the cross-sectional contour of the covering material 5. And an outer mold formed with That is, while feeding each wire through each through hole of the inner mold, the resin is poured into the gap between the inner mold and the outer mold, and the wire and resin are pushed out from the through hole of the outer mold together. Thereafter, the coating material 5 is formed around the wire by curing the resin.

  Before use, the cable 1 is wound and stored so that the surface including the core wire 2, the tension member 3, and the support wire 4 is parallel to the winding axis. On the other hand, when the cable 1 is used, the cable 1 is drawn from the aerial wiring optical fiber cable toward the user's house, and when reaching the user's house, the surface parallel to the winding axis is parallel to the mounting surface such as a wall. That is, in FIG. 3, it is turned toward the terminal so that one long side of the core wire element portion 5a is in close contact with the mounting surface. And when leaving | separating from a mounting surface, the core wire element part 5a and the support wire element part 5b are isolate | separated, only the core wire element part 5a is guide | induced to the terminal machine direction, and when it reaches near the terminal machine further, the core wire element part 5a is The core wire 2 is exposed by being torn at the groove 5d and connected to the terminal.

  In the cable 1, the groove 5 d is inclined with respect to the attachment surface and bent near the bottom, or when the groove 5 d is viewed from a direction orthogonal to the attachment surface, the bottom of the groove 5 d is not visible. Even if a spider inserts the egg-laying tube diagonally, the egg-laying tube hits the bent part of the way. For this reason, the spider cannot insert the laying tube all the way. Therefore, it is possible to prevent the cord 2 from being damaged by the oviduct.

Embodiment 2
FIG. 4 is a radial cross-sectional view showing the coated cable according to the second embodiment. The covered cable 11 also includes two optical fiber cores 12 and 12, tension members 13 and 13, a support wire 14, and a covering material 15 as in the first embodiment. Since the core wire 12, the tension member 13, and the support wire 14 may be the same shape and the same quality as the first embodiment, the description thereof will be omitted.

The covering material 15 is different from the first embodiment in the shape of the groove 15d. That is, the edge of the opening of the groove 15d on the support line 14 side is at a position that is about one-quarter side away from the ridge angle on the support line 14 side, and the other edge is at a position that is about one-half length apart. Then, the groove 15d is tapered toward the core wire 12.
The storage method and use method of the cable 11 are the same as in the first embodiment. Also in the cable 11, when the groove 15d is inclined with respect to the attachment surface or when the groove 15d is viewed from a direction orthogonal to the attachment surface, the bottom of the groove 15d cannot be seen. For this reason, it is difficult for the cocoon to insert the laying tube all the way. Therefore, the core wire 12 can be prevented from being damaged by the oviduct.

FIG. 3 is a front view showing the covered cable according to the first embodiment. It is a back view similarly. It is AA sectional drawing in FIG. FIG. 6 is a radial cross-sectional view showing a coated cable according to a second embodiment. It is radial direction sectional drawing which shows the conventional covered cable.

Explanation of symbols

1,11 Covered cable 2,12 Core wire 3,13 Tension member 4,14 Support wire 5,15 Cover material 5d, 15d Groove

Claims (5)

A core wire, a tension member arranged in parallel to the core wire, and a coating material made of resin covering them, and a groove is formed in the longitudinal direction along the core wire on the surface of the coating material In
A covered cable characterized in that, when cut in the radial direction of the core wire, the straight line connecting the opening center and the bottom center of the groove is not orthogonal to the plane including the core wire and the tension member. A core wire, a tension member arranged in parallel to the core wire, and a coating material made of resin covering them, and a groove is formed in the longitudinal direction along the core wire on the surface of the coating material In
A covered cable characterized in that when a groove is projected in a direction perpendicular to a surface including a core wire and a tension member, the opening and bottom of the groove do not overlap. In a core wire and a covering material comprising a resin covering the core wire and having a plane parallel to the core wire on the outer periphery, and grooves are formed in the longitudinal direction along the core wire on the surface,
A covered cable characterized in that when cut in the radial direction of the core wire, a straight line connecting the opening center and the bottom center of the groove is not orthogonal to the plane. In a core wire and a covering material comprising a resin covering the core wire and having a plane parallel to the core wire on the outer periphery, and grooves are formed in the longitudinal direction along the core wire on the surface,
A covered cable characterized in that when a groove is projected in a direction orthogonal to the surface, the opening and bottom of the groove do not overlap. With a core wire and a covering material made of a resin that covers the core wire, in which a groove is formed in the longitudinal direction along the core wire on the surface of the covering material,
A coated cable, wherein the groove is bent when cut in the radial direction of the core wire.

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