JP2003215416A - Protector for optical fiber cable and attachment method for optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protector for an optical fiber cable in which surge measures are taken and an optical fiber cable is easily attached and to provide an attachment method for the optical fiber cable. <P>SOLUTION: Insertion holes 10H and 11H into which the optical fiber cable 1 to be attached is inserted are bored in housing 10 and 11 and a tension member lock tool 20 is arranged separately in the housings 10 and 11; after a portion of the jacket of the optical fiber cable is removed for exposure, an end part of a cut tension member 3 is locked with the tension member lock tool 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable protector for mounting an optical fiber cable in which a core wire and a tension member are covered with an outer cover, and a method for mounting the optical fiber cable.

[0002]

2. Description of the Related Art In recent years, along with the speeding up of communication networks, not only are optical fiber cables laid between base stations of telecommunications carriers, but also optical fiber cables extended from base stations are used by individual users. It has started to be used for communication on the Internet, etc. An optical fiber cable is a bundle of core wires (optical fibers) made of a translucent material such as glass or plastic, which are covered with a tension member such as metal, steel, alloy or FRP with an outer cover in order to maintain strength. When the optical fiber cable extended from the base station is drawn into the user's house, conventionally, for example, the optical fiber cable is drawn directly from the pipe opening of the air conditioner, and a media converter for converting an optical signal into an electric signal is used. Was connected to such a signal processing device.

[0003]

However, in the method of directly pulling the optical fiber cable extended from the base station of the communication carrier into the user's house as described above,
In general, steel wires with low material cost are often used for tension members.Therefore, instantaneous voltage may be applied to tension members due to lightning, external noise, etc. This has caused malfunction or failure of the equipment to which the optical fiber cable is connected. Therefore, in order to solve these problems, a terminal device equipped with a lightning arrester is prepared as a surge countermeasure inside or outside the user's house, and an optical fiber cable extended from the base station is installed at this terminal device. A method of cutting and connecting the tension member to the lightning arrester and fusing the core wire, which is a signal wire, to the optical fiber cable for in-home wiring has been adopted.

However, in the above-mentioned method, the tension member is cut off at the terminating device and connected to the lightning arrester, so that sufficient countermeasures against surge current are taken, but a terminating device is required for each user's house. Since the equipment is required and the method of fusion-bonding with the optical fiber cable for in-home wiring is adopted, the cost of construction when pulling the optical fiber cable into the user's home becomes high, and the time required for construction It had the problem of becoming longer.

The present invention has been made in view of the above circumstances, and at least two tension member locking portions for locking the tension member are provided inside the housing having an insertion hole for inserting an optical fiber cable. It is an object of the present invention to provide an inexpensive optical fiber cable protector that can easily take measures against surges by providing the three tension member locking portions separately.

Another object of the present invention is to provide a first hole for inserting a tension member into a tension member locking portion,
A second hole communicating with the first hole in a direction intersecting with the first hole is provided, and the tension member inserted into the first hole is pressed from the second hole side, whereby the optical fiber cable can be quickly inserted. It is to provide a protector for an optical fiber cable that can be attached.

Still another object of the present invention is to lock the outer cover of the optical fiber cable, remove a part of the outer cover and cut the exposed tension member, and separate the both ends of the cut tension member. It is an object of the present invention to provide a method of attaching an optical fiber cable, which can easily take measures against surges by quickly locking the optical fiber cable.

[0008]

The optical fiber cable protector according to the first aspect of the invention is attached to an optical fiber cable protector for mounting an optical fiber cable in which a core wire and a tension member are covered with an outer cover. A housing provided with an insertion hole for inserting the optical fiber cable to be inserted, and two tension member locking portions spaced apart from each other inside the housing, and a part of the outer cover of the optical fiber cable is removed. It is characterized in that the exposed tension member is locked by the tension member locking portion.

According to the first aspect of the invention, the tension member locking portion for locking the tension member is provided inside the housing having the insertion hole for inserting the optical fiber cable in which the core wire and the tension member are covered with the outer cover. And at least two are separated from each other. Therefore, when pulling the optical fiber cable into the house, after removing the outer sheath to expose the core wire and the tension member, the tension member of the optical fiber cable to be attached is cut over an appropriate length, and the cut end portion is cut. Since each of them is locked by a separate tension member locking part and separated by the required distance, even if a high voltage is applied due to lightning, etc., a surge current will not flow to the tension members inside the house due to electrical conduction, ensuring It becomes possible to protect the devices in the house. In addition, in order to prevent the surge current from flowing,
It is inexpensive because it is not necessary to prepare a termination device equipped with a lightning arrester. Further, since it is not necessary to fuse with another optical fiber cable, the optical fiber cable can be quickly attached.

In the optical fiber cable protector according to the second aspect of the present invention, the tension member locking portion is provided so as to intersect the first hole through which the tension member is inserted, and the first hole. And a second hole communicating with the first hole, and the tension member inserted into the first hole is pressed from the side of the second hole.

According to the second aspect of the invention, a first hole for inserting the tension member into the tension member locking portion,
A second hole communicating with the first hole in a direction intersecting with the first hole is provided, and the tension member inserted through the first hole is pressed from the side of the second hole to lock the tension member. . Therefore, for example, by providing the through hole for inserting the tension member in the tension member locking portion and providing the screw hole communicating with this through hole, the tension member inserted through the through hole can be screwed. Therefore, the tension member can be easily locked.

The optical fiber cable protector according to a third aspect of the present invention further comprises a cable locking portion provided in the vicinity of the insertion hole, and the cable locking portion locks the outer cover of the optical fiber cable. It is characterized in that the optical fiber cable is attached.

According to the third aspect of the invention, a cable locking portion for locking the optical fiber cable is provided. Therefore,
When the tension member is cut and the cut end is locked to the tension member locking part, the optical fiber cable's outer cover is locked to the cable locking part, so that excessive tension is applied to the core wire. It is possible to prevent this.

According to a fourth aspect of the present invention, there is provided a method for attaching an optical fiber cable, comprising a core wire and a tension member covered with an outer cover, to the protector, after locking the outer cover of the optical fiber cable. It is characterized in that a part of the outer skin is removed and the exposed tension member is cut, and both ends of the cut tension member are separated and locked.

According to the fourth aspect of the invention, after the outer cover of the optical fiber cable is locked, a part of the outer cover is removed and the exposed tension member is cut, and the cut ends are separated and locked. Therefore, it is possible to work while preventing excessive tension from being applied to the core wire. Further, since it is not necessary to fuse with another optical fiber cable, the optical fiber cable can be quickly attached.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, as a preferred embodiment of the present invention, for attaching an optical fiber cable in which a core wire which is a signal wire and two tension members arranged on both sides thereof are covered with an outer cover. The protector will be specifically described with reference to the drawings. FIG. 1 is a perspective view showing an internal configuration of a protector for an optical fiber cable according to the present invention.
3 and 4 are a plan view and a side view, respectively.

The protector for an optical fiber cable according to the present invention comprises:
The lower lid member 10 and the upper lid member 11 are provided with a tension member locking tool 20 and a cable locking tool 30, which will be described later. The lower lid member 10 is formed, for example, in a box shape from a synthetic resin material such as plastic or polyvinyl chloride, and has a cutout portion 10H at approximately the center of two opposing side portions for inserting the optical fiber cable 1. ，
10H is provided. The upper lid member 11 is formed of a synthetic resin material such as plastic or polyvinyl chloride into a box shape slightly larger than the lower lid member 10 in order to fit the lower lid member 10. Notches 11H and 11H are also provided substantially at the centers of the two opposite side portions of the upper lid member 11, and when the upper lid member 11 is fitted to the lower lid member 10, the respective notches 11H, 11H and the notches. 10H, 1
OH is set to overlap.

The cable stopper 30 includes cutouts 10H, 1
One set is provided near 0H. Each of the cable locking members 30 is composed of rectangular parallelepiped bases 31, 31 integrally formed with the lower lid member 10, and a mounting piece 32 which is screwed to the bases 31, 31 for mounting. The two bases 31 and 31 are arranged equidistantly from the axis of the optical fiber cable 1 to be inserted into the cutouts 10H and 10H, and stand upright on the lower lid member 10.
It is slightly larger than the width of. Also, the bases 31 and 3
1 is provided with a screw hole (not shown) in a direction perpendicular to the bottom of the lower lid member 10. The mounting piece 32 is a plate-shaped member having a curved central portion, and a through hole for inserting a screw suitable for the screw hole is provided at an appropriate position.

The lower lid member 10 has an optical fiber cable 1
Is provided with a pair of tension member locking members 20, 20 which are arranged equidistantly from the axis center of the optical fiber cable 1. The tension member locking members 20, 20 are spaced from each other in the axial direction of the optical fiber cable 1 as appropriate. Further, a pair of tension member locking tools 20, 20 are provided.

As will be described later, when the tension member 3 of the optical fiber cable 1 is locked by the tension member locking device 20, the coating of the optical fiber cable 1 is removed over a predetermined length. On the other hand, when the distance between the two tension member locking devices 20, 20 arranged in the axial direction is small, it is not sufficient as a measure against the surge current. For example, when the surge withstand voltage is set to 6 kV, air is used. It is necessary to set an insulation distance of 1 mm / kV and to provide an interval of at least 6 mm or more. Also, the distance between the pair of tension member locking members 20, 20 is, for example, surge withstand voltage of 6 kV.
When it is necessary to set to, it is necessary to provide a space of at least 6 mm or more.

FIGS. 4 and 5 are a perspective view and a front sectional view of the tension member locking device 20. The tension member locking device 20 is provided with an insertion hole 22 through which the tension member 3 is inserted on a required surface of the rectangular parallelepiped block, and a slit 21 which communicates with the insertion hole 22 and is parallel to the axis of the insertion hole 22. . The width of the slit 21 and the diameter of the insertion hole 22 are slightly larger than the diameter of the tension member 3 to be locked.
After passing through 1, the insertion hole 22 is inserted. Here, the tension member 3 is formed of a metal material such as steel or an alloy, that is, a material having conductivity in order to reinforce the strength of the optical fiber cable 1. Tension member 3
In consideration of the ease of attachment, it is desirable to provide a slit 21 that is opened toward the outside of the lower lid member 10, and also insert so that it is substantially parallel to the axis of the optical fiber cable 1 to be attached. It is desirable to provide the holes 22.

Further, the tension member locking device 20 is provided with a screw hole 23 communicating with the insertion hole 22 and provided in a direction intersecting with the insertion hole 22. The screw hole 23 is preferably provided in a direction perpendicular to the lower lid member 10 so that the screw can be easily inserted. The tension member locking device 20 is provided with another screw hole 24 on the surface opposite to the surface provided with the screw hole 23 so that the lower lid member 10 can be screwed. However, the tension member locking device 20 may be integrally formed with the lower lid member 10 like the base 31 of the cable locking device 30.

6 and 7 are schematic views showing the procedure for attaching the optical fiber cable 1 to the protector. First, as shown in FIG. 6A, the optical fiber cable 1 is inserted into the cutouts 10H and 10H. And the two mounting pieces 3
2 and 32 are screwed onto the two pairs of bases 31 and 31 by screws to fix the optical fiber cable 1 to the cable stoppers 30 and 30.
(Fig. 6 (b)). Then, using a suitable tool, the coating of the optical fiber cable 1 sandwiched between the two cable stoppers 30, 30 is removed, and the core wire 2 which is a signal wire,
The tension members 3 and 3 are exposed (see FIG. 6).
(C)).

Next, the exposed tension members 3,
3 is cut over a predetermined length (FIG. 7 (d)). Since the optical fiber cable 1 is locked by the cable locking members 30 and 30 before the tension members 3 and 3 are cut, no tension is applied to the core wire 2 during work, and the core wire 2
No more accidentally disconnecting. Then, the cut ends of the tension members 3 and 3 are inserted into the insertion holes 22 of the tension member locking tools 20, 20, 20, 20.
The tension members 3 and 3 are locked by inserting them through 22, 22 and 22 and screwing them (FIG. 7).
(E)). By attaching the optical fiber as described above, it is not necessary to fuse the optical fiber, which is the core wire, as in the conventional case. Therefore, the work time of the construction is considerably shortened and the work efficiency is improved.

FIG. 8 is a perspective view showing another form of the tension member locking device 20. The locking tool for locking the tension member 3 need not be limited to the tension member locking tool 20 shown in FIG. 4 and FIG.
It is also possible to use the tension member locking device 50 as shown in FIG. This tension member locking device 5
Reference numeral 0 is a rectangular parallelepiped first member 51 and a second member 52 made of a synthetic resin material such as plastic or vinyl chloride, and screw holes 55, 55 are formed in the first member 51 at appropriate intervals. And through-holes 56, 56 that are opened in the second member 52 at appropriate intervals and are screwed together to enable connection.

The first member 51 has two screw holes 55, 5
5 has a V-shaped groove 53 formed therein, and the second member 52 has a V-shaped groove 54 formed so as to face the groove 53 when connected to the first member 51. It is provided. It is desirable that the depths of the grooves 53 and 54 provided in the first member 51 and the second member 52 be slightly smaller than the radius of the tension member 3 to be locked. When the above-mentioned tension member 3 is locked using this tension member locking tool 50, the tension member 3 is first
The second member 52 is arranged along the groove 53 formed in the member, and the second member 52 is screwed to the first member 51. The first member 51 may be integrally formed with the lower lid member 10, or may be separately formed and screwed from the back side of the lower lid member 10.

The protector for the optical fiber cable 1 described in the present embodiment may be installed on the wall surface of the user's house, and through holes for inserting concrete bolts or the like may be provided at appropriate places on the lower lid member 10. It may be opened. Alternatively, the protector of the optical fiber cable 1 may be held by the optical fiber cables 1 extending to both sides of the protector instead of being installed on the wall surface of the user's house. As described above, when the protector is held in a hollow shape, the protector does not have to have a rectangular shape, but can have an oval shape, a dome shape, or the like to have a good appearance.

The protector of the optical fiber cable 1 is
Since it is often used outside the user's house, a structure having a drip-proof effect is desirable when the upper lid member 11 is fitted to the lower lid member 10. FIG. 9 is a perspective view showing the internal structure of the protector of the optical fiber cable 1 having a drip-proof effect. The tension member locking device 20, 20, 20,
A hook-shaped partition plate 40, 40, 40, 40 is provided on the outer side of 20. Each partition plate 40 includes one tension member locking device 20, another tension member locking device 20, 20,
It is arranged so as to be shielded from 20, so that even if water droplets enter the inside of the protector of the optical fiber cable 1 from the outside, it is possible to maintain continuity between the two tension members 3 by the water droplets. Can be prevented.

The partition plates 40, 40, 40, 40 may be formed integrally with the lower lid member 10 or may be fixed to the lower lid member 10 with screws, adhesives or the like. . Further, the partition plates 40, 40, 40, 40 are
It may be formed integrally with the upper lid member 11 and arranged at a predetermined position when fitted to the lower lid member 10.

When the optical fiber cable 1 from the base station is installed in the air by using a utility pole, the optical fiber cable 1 is supported by a supporting wire (suspension wire) made of a steel material. I often do for that reason,
When attaching the optical fiber cable 1 to the protector, it is necessary to cut the support wire together with the optical fiber cable 1, and a locking tool for locking the end of the cut support wire is provided on the outside of the protector of the optical fiber cable 1. It may be provided in.

As described above in detail, in the case of the first invention, the tension member is provided inside the casing having the insertion hole for inserting the optical fiber cable in which the core wire and the tension member are covered with the outer cover. There are at least two tension member locking portions for locking each other. Therefore, when pulling the optical fiber cable into the house, after removing the outer sheath to expose the core wire and the tension member, the tension member of the optical fiber cable to be attached is cut over an appropriate length, and the cut end portion is cut. Since each of them is locked by a separate tension member locking part and separated by the required distance, even if a high voltage is applied due to lightning, etc., a surge current will not flow to the tension members inside the house due to electrical conduction, ensuring It becomes possible to protect the devices in the house. In addition, it is inexpensive because it is not necessary to prepare a termination device provided with a lightning arrester in order to prevent a surge current from flowing. Further, since it is not necessary to fuse with another optical fiber cable, the optical fiber cable can be quickly attached.

In the case of the second invention, the first hole for inserting the tension member into the tension member locking portion and the second hole provided so as to intersect with the first hole and communicating with the first hole. Are provided, and the tension member inserted through the first hole is pressed from the side of the second hole to lock the tension member. Therefore, for example, by providing the through hole for inserting the tension member in the tension member locking portion and providing the screw hole communicating with this through hole, the tension member inserted through the through hole can be screwed. Therefore, the tension member can be easily locked.

In the case of the third aspect of the invention, a cable locking portion for locking the optical fiber cable is provided. Therefore, when the tension member is cut and the cut end portion is locked to the tension member locking portion, by locking the outer cover of the optical fiber cable to the cable locking portion,
It is possible to prevent excessive tension from being applied to the core wire.

According to the fourth aspect of the invention, after the outer sheath of the optical fiber cable is locked, a part of the outer sheath is removed and the exposed tension member is cut, and both cut ends are separated and locked. , It is possible to work while preventing excessive tension from being applied to the core wire. Also, since it is not necessary to fuse with another optical fiber cable, it becomes possible to quickly attach the optical fiber cable, etc.
The present invention has excellent effects.

[Brief description of drawings]

FIG. 1 is a perspective view showing an internal configuration of a protector for an optical fiber cable according to the present invention.

FIG. 2 is a plan view showing an internal configuration of a protector for an optical fiber cable according to the present invention.

FIG. 3 is a side view showing an internal configuration of a protector for an optical fiber cable according to the present invention.

FIG. 4 is a perspective view of a tension member locking tool.

FIG. 5 is a front sectional view of a tension member locking tool.

FIG. 6 is a schematic diagram showing a procedure for attaching an optical fiber cable to a protector.

FIG. 7 is a schematic diagram showing a procedure for attaching an optical fiber cable to a protector.

FIG. 8 is a perspective view showing another form of the tension member locking device.

FIG. 9 is a perspective view showing an internal configuration of a protector of an optical fiber cable having a drip-proof effect.

[Explanation of symbols] 1 optical fiber cable 2 cores 3 tension members 10 Lower lid member 10H notch 11 Upper lid member 11H notch 20 Tension member locking device 30 cable fasteners

Claims (4)

[Claims] 1. An optical fiber cable protector for mounting an optical fiber cable comprising a core wire and a tension member covered with an outer cover, and a housing having an insertion hole for inserting the optical fiber cable to be mounted, Two tension member locking portions that are spaced apart from each other inside the housing are provided, and the tension member locking portion locks the tension member exposed by removing a part of the outer cover of the optical fiber cable. A fiber optic cable protector characterized by being able to do so. 2. The tension member locking portion includes a first hole through which the tension member is inserted, and a second hole which is provided so as to intersect with the first hole and which communicates with the first hole. The tension member that is inserted into the first hole is the second member.
The optical fiber cable protector according to claim 1, wherein the protector is adapted to be pressed from the side of the hole. 3. An optical fiber cable is further provided with a cable locking portion provided in the vicinity of the insertion hole, and an outer cover of the optical fiber cable is locked by the cable locking portion to mount the optical fiber cable. The optical fiber cable protector according to claim 1 or 2, wherein. 4. A method of attaching an optical fiber cable, which comprises a core wire and a tension member covered with an outer cover, to a protector, wherein after the outer cover of the optical fiber cable is locked, a part of the outer cover is removed and exposed. A method for mounting an optical fiber cable, characterized in that the tension member is cut, and both ends of the cut tension member are separated and locked.