JPH077141B2 - Optical fiber cable laying tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an optical fiber cable laying tool which is attached to the tip of an optical fiber cable when the optical fiber cable is laid in a conduit or the like. Regarding improvement.

(Prior Art) When laying an optical fiber cable in a conduit, it is performed by connecting the tip of a wire or the like to the tip of the optical fiber cable and pulling this wire or the like (pulling tool). In this case, if the wire is simply connected to the optical fiber cable, a large tension acts on the fiber core wire, which may damage the fiber core wire. Therefore, in order to provide a tensile tension, a construction tool is fixed to a tension member provided on the optical fiber cable, and the construction tool is pulled by a wire.

FIG. 4 and FIG. 5 show a conventional mounting structure for this type of installation tool.

In the figure, 1 is an optical fiber cable. The cable 1 includes a fiber core wire 2 and a steel wire (tension member) 3. Reference numeral 4 denotes a laying tool attached to the tip of the cable 1. The laying tool 4 includes a metal cap 5 having an opening on the base end side, and an eyebolt 6 fixed to the tip of the metal cap 5. A tip of a wire for pulling the cable 1 is connected to the eyebolt 6.

The installation work of the installation tool 4 is performed by covering the tip of the cable 1 protruding only the steel wire 3 with the base end of the metal cap 5 and then filling the cap 5 with an epoxy adhesive 8. It is performed by winding a tape 9 around the boundary with the cap 5. With this, the steel wire 3 and the cap 5 are adhered, and even if the cable 1 is laid by pulling the eyebolt 6, tension is not applied to the fiber core wire 2.

Then, when the installation is completed, the optical fiber cable 1 is attached with an optical connector for connecting to another optical fiber. To attach the optical connector, firstly, the optical fiber cable 1 is cut to remove the installation tool 4, then the fiber core wire 2 is exposed, and a ferrule (not shown) is bonded to the tip of the fiber core wire 2. Then, the fiber core wire 2 and the end faces of the ferrule are polished and an optical connector is attached to the ferrule.

By the way, the ferrule is provided at the tip of the fiber core wire in order to connect the fiber core wires with extremely small diameter (about 0.7 m / m) with the optical connector without eccentricity. Adhering the ferrules and polishing the end faces of both require high-precision work. However, in the cable laying work, the ferrule bonding work and the fiber core wire 2 and the end face of the ferrule must be ground at the cable laying site. Therefore, the amount of work on the site becomes enormous, and it takes much time to lay the cable 1, and it is also difficult to reliably adhere the ferrule and polish the end face.

(Problems to be Solved by the Invention) As described above, when the cable laying work is performed using the conventional laying tool, the ferrule bonding work and the polishing work must be performed at the cable laying site, so that the cable laying work is performed. Not only requires a lot of man-hours for
It was also difficult to surely carry out the polishing work.

The present invention has been made in view of the above conventional drawbacks, and an object of the present invention is to provide an optical fiber cable laying tool capable of laying an optical fiber cable in a state where a ferrule is attached to a fiber core wire in advance. And

[Structure of the Invention] (Means for Solving the Problems) The laying tool for an optical fiber cable of the present invention covers the fiber core wire protruding from the end of the optical fiber cable and the ferrule attached to the end of this fiber core wire. A cover portion, a mounting portion having a first hole portion at a base end of the cover portion for inserting the fiber core wire to which the ferrule is attached, and a tip portion of the cover portion. An engaging portion connected to a pulling tool for pulling the optical fiber cable, wherein the attachment portion has a second hole portion for inserting a tension member protruding from a tip of the optical fiber cable. Of the tension member, which is formed in parallel with the hole portion of the first screw hole and has a screw hole extending from the outer peripheral surface thereof to the second hole portion, and is inserted into the second hole portion. Are configured to be secured within said second hole portion by press screws are screwed into the screw hole.

(Operation) Therefore, if the laying tool of the present invention is used, it becomes possible to lay an optical fiber cable in which the ferrule is attached to the fiber core wire in advance, and at the cable laying site, the ferrule bonding work and the fiber core are carried out. Eliminating the need for wire and ferrule end face polishing. In addition, the optical fiber cable is attached by inserting the fiber core wire having the ferrule into the cover portion from the first hole portion of the attaching portion, inserting the tension member into the second hole portion, and pressing the tension member into the second portion with the pressing screw. Since it can be carried out by pressing and fixing it in the hole portion, it is easy to attach and detach the optical fiber cable to and from the installation tool.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3.

In the figure, 10 is an optical fiber cable. The cable 10 includes a fiber core wire 11 and a steel wire (tension member) 12. Further, in this cable 10, the fiber core wire 11 and the steel wire 12 are processed so as to project from the tip 13, and the ferrule 14 is previously bonded to the tip of the fiber core wire 11, and the fiber core wire 11 and The end surface of the ferrule 14 is polished.

Reference numeral 16 is a laying tool attached to the tip of the cable 10. The installation tool 16 includes a cover portion 17 and the cover portion 17
It is composed of an attachment portion 18 provided on the base end side of and a eyebolt (engagement portion) 19 provided on the tip of the cover portion 17.

The cover portion 17 has a cylindrical shape in which the fiber core wire 11 protruding from the tip 13 of the cable 10 and the ferrule 14 attached to the fiber core wire 11 can be housed inside, and the base end side is open, and A female screw 20 is formed on the inner surface of the base end side.

The mounting portion 18 has an external thread 21 that is screwed into the female thread 20 on the outer surface on the tip end side, and a recess 22 that fits into the cable 10 is formed on the proximal end side. Further, as shown in FIG. 3, a hole portion (first hole portion) 23 having a size through which the fiber core wire 11 having the ferrule 14 attached thereto can be inserted is formed in the central portion of the attachment portion 18. A hole portion (second hole portion) 24 having a size that allows the steel wire 12 to pass therethrough is formed outside the hole portion 23. Further, on the peripheral surface of the mounting portion 18, screw holes 25 are drilled toward the holes 24.
The steel wire 12 is fixed to the mounting portion 18 by tightening the push screw 26 screwed into the screw hole 25 with the steel wire 12 inserted thereinto. The mounting portion 18 is integrated with the cover portion 17 by screwing the male screw 21 into the female screw 20. The cover portion 17 and the mounting portion 18 may of course be integrally formed in advance.

The eyebolt 19 is rotatably attached to the tip of the cover portion 17. A pulling tool (not shown) such as a wire for pulling the cable 10 is connected to the eyebolt 19. By making the eyebolt 19 rotatable, the pulling tool is not attached to the cable 10 when the cable 10 is pulled. It is possible to prevent twisting.

Since the laying tool 16 has the above-described configuration, it can be easily attached to the tip of the cable 10 in which the ferrule 14 is attached to the fiber core wire 11 in advance.
That is, the fiber core wire 14 having the ferrule 14 is passed through the hole 23 of the mounting portion 18, the steel wire 12 is passed through the hole portion 24, and the screw 26 is tightened to fix the steel wire 12 to the mounting portion 18. . Then, a pulling tool such as a wire is connected to the eyebolt 19 and pulled, whereby the cable 10 is laid.
In this case, since the installation tool 16 is fixed to the steel wire 12, no tension acts on the fiber core wire 11. Further, since the fiber core wire 11 and the ferrule 14 are protected by the cover portion 17, they are not damaged when the cable 10 is laid. When the installation of this cable 10 is completed, the screw 26
And remove the installation tool 16 from the cable 10. Then, an optical connector (not shown) is attached to the ferrule 14. Therefore, it is not necessary to perform the bonding work and the polishing work of the ferrule 14 at the cable laying site. Further, unlike the conventional installation tool 14, the installation tool 16 can be used for installing another cable.

[Effects of the Invention] As described above, if the laying tool of the present invention is used,
It is possible to lay an optical fiber cable in which a ferrule is attached to the fiber core wire in advance. Therefore, it is not necessary to perform the ferrule bonding work and the end face polishing work of the fiber core wire and the ferrule at the cable laying site, and the man-hour required for the cable laying work at the site can be greatly reduced. Further, the work of bonding the ferrule and the end face polishing work of the ferrule and the like can be performed in a well-equipped place. Therefore, compared with the case where these operations are performed at the laying site, not only the number of operations can be greatly reduced, but also these operations can be performed with high accuracy, and the optical fiber cable can be connected with low loss. In addition, the optical fiber cable is attached by inserting the fiber core wire having the ferrule into the cover portion from the first hole portion of the attaching portion, inserting the tension member into the second hole portion, and pressing the tension member into the second portion with the pressing screw. Since it can be done simply by fixing it in the hole of
It is also easy to attach and detach the optical fiber cable to and from the installation tool.

[Brief description of drawings]

1 to 3 are views for explaining an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a laying tool is attached to an optical fiber cable, and FIG. 1 is I-I of FIG. 3 is a sectional view taken along line III-III in FIG. 4 and 5 are views for explaining a conventional example, FIG. 4 is a perspective view showing a state in which a laying tool is attached to an optical fiber cable, and FIG. 5 is a sectional view taken along line VV of FIG. Is. 10 …… Optical fiber cable, 11 …… Fiber core 12 …… Tension member, 13 …… (Cable) tip 14 …… Ferrule, 16 …… Installing tool 17 …… Cover part, 18 …… Mounting part 19 …… Engagement part (eye bolt)

Claims (1)

[Claims] 1. A cover part for covering a fiber core wire protruding from the tip of an optical fiber cable and a ferrule attached to the end of the fiber core wire, and a fiber core provided at the base end of the cover part and having the ferrule attached thereto. A mounting part having a first hole for inserting a wire into the cover part; and an engaging part provided at a tip of the cover part and connected to a pulling tool for pulling the optical fiber cable, A second hole portion for inserting a tension member protruding from the tip of the optical fiber cable is formed in the attachment portion in parallel with the first hole portion, and the second hole portion is provided from the outer peripheral surface thereof. Is formed, and the tension member inserted into the second hole is fixed in the second hole by a push screw screwed into the screw hole. Laying tool of optical fiber cable to the butterflies.