JP2001296435A - Connection box for optical cable wound around overhead earth wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a connection box for an optical cable wound around an overhead earth wire, a connection box with which workability is improved. SOLUTION: A setting plate 10 for an optical cable (the cable) wound around an overhead earth wire is installed inside the connection box body 1 in a manner allowing the plate to be in and out freely. On this plate 10 for setting the terminals of the cable, there are provided a clamp part 11 for gently clamping the cable and a guide part 12 for guiding part of the cable terminal rolled up at a bending radius larger than allowable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connecting an optical fiber core of an optical unit of an optical fiber cable wound around an overhead ground wire and laying the optical fiber with an optical fiber core to be connected thereto. The present invention relates to an aerial ground wire wrapping type optical cable connection box for accommodating a core wire connecting portion together with an extra length portion.

[0002]

2. Description of the Related Art An overhead ground wire wound optical cable has, for example, slits at a plurality of locations (for example, six locations) at regular intervals in the circumferential direction on the outer periphery of a flexible resin rod-shaped spacer. Each of the slits accommodates an optical unit, and in this state, the outer periphery of the slit is covered with a synthetic resin tube.

FIGS. 5 (A) and 5 (B) show an optical fiber core of an optical unit of such an overhead ground wire wound optical cable and an optical fiber core which is a connection partner thereof. FIG. 5A shows a conventional connection box for an overhead ground wire wrapped optical cable accommodated together with the extra length portion, and FIG. 5A shows a connection box for the overhead ground wire wrapped optical cable of the present example with a lid cut away. FIG. 5B is a partially cutaway side view of FIG. 5A.

[0004] The connection box for an optical fiber cable with an overhead ground wire is provided with a rectangular connection box main body 1 made of metal such as aluminum and having an open top, and a lid 2 put on the upper part of the connection box main body 1; The cover 2 includes a fastener 3 made of a bolt and a nut for fixing the lid 2 to the connection box body 1. A rectangular base plate 4 made of metal such as aluminum is fixedly installed in the junction box body 1. At positions adjacent to four sides of the base plate 4, guides 5 are fixed in a U-shape with the opening toward the center.

[0005] Into the junction box body 1 having such a structure, an overhead ground wire wound type optical cable and an optical cable (not shown) to be connected thereto are clamped by the cable clamps 6A and 6B and pulled in, and the overhead ground wire is connected. The extra length of the optical unit 7 exposed from the end of the wound optical cable and the optical unit 8 exposed from the end of the optical cable to be connected to the optical unit 7 are looped off on the base plate 4 and held by the respective guides 5.
The extra lengths of the optical fibers exposed from the two optical units 7 and 8 are looped off and held by the guides 5, and the optical fiber connectors 9A and 9B connecting the two optical fibers. Is arranged. In loop removal, if the bending radius of the optical unit or the optical fiber core wire is small, the signal transmission loss increases, so the minimum bending radius is 100 mm, for example.
This is performed as described above.

[0006]

However, in such a conventional connection box for an overhead ground wire wound type optical cable,
On the base plate 4 fixed to the bottom in the connection box main body 1, loop removal of the optical units 7, 8 and optical fiber cores and arrangement on each guide 5, arrangement of the core connection parts 9A, 9B, etc. Since the work is performed, there is a problem that the workability is very poor.

An object of the present invention is to provide a connection box for an overhead ground wire wound type optical cable which can improve workability.

[0008]

According to the present invention, an overhead ground wire wrapped optical cable and an optical cable to be connected thereto are drawn into a connection box main body. The extra length of each optical unit exposed from the optical cable as the connection partner is looped off, the extra length of the optical fiber core exposed from both optical units is looped off, and both optical units are removed. It is an object of the present invention to improve an aerial ground wire wound type optical cable connection box in which a fiber cable connecting portion connecting fiber cores is arranged.

According to the first aspect of the present invention, an overhead ground wire wrapped optical cable terminal set plate is installed in the connection box body so as to be able to enter and exit. The overhead ground wire wrapped optical cable terminal set plate includes a clamp portion for loosely clamping the overhead ground wire wrapped optical cable and a portion obtained by rounding the terminal of the overhead ground wire wrapped optical cable with a bending radius equal to or greater than an allowable bending radius. And a guide portion for guiding the light.

[0010] When the overhead ground wire wrapped optical cable terminal set plate is installed in the junction box main body so as to be able to enter and exit, the overhead ground wire wrapped optical cable terminal set plate is taken out of the junction box main body to allow the ground connection. A wire-wound optical cable can be set, and workability can be improved.

[0011] In the connection box for an overhead ground wire wrapped optical cable according to the second aspect, the overhead ground wire wrapped optical cable terminal set plate is installed in the connection box main body so as to be able to enter and exit. The overhead ground wire wrapped optical cable terminal set plate includes a clamp portion for loosely clamping the overhead ground wire wrapped optical cable and a portion obtained by rounding the terminal of the overhead ground wire wrapped optical cable with a bending radius equal to or greater than an allowable bending radius. And a guide portion for guiding the light. On this overhead ground wire wrapped optical cable terminal set plate, a first excess length storage sheet for looping and storing the excess length portion of the optical unit of the overhead ground wire wrapped optical cable, and both optical fibers A second extra length storage sheet for storing the extra length portion of the core wire in a loop and accommodating the optical fiber connection portion of both optical fiber cores is arranged so as to overlap and be able to enter and exit the junction box body. I have.

In this case as well, since the overhead ground wire-wound optical cable terminal set plate is installed in the connection box body so as to be able to enter and exit, the overhead ground wire-wound optical cable terminal set plate is placed outside the connection box body. The overhead ground wire wound type optical cable can be set out, and the workability can be improved. Further, the first extra length storage sheet and the second extra length storage sheet are arranged on the overhead ground wire wound type optical cable terminal set plate so as to be able to enter and exit the junction box body. Therefore, the first and second extra-length storage sheets can also be taken out of the connection box main body for easy work.

[0013]

1 (A), 1 (B) to 4 show an example of an embodiment of an aerial ground wire wound type optical cable connection box according to the present invention, and FIG. FIG. 1B is a plan view showing a connection box for an overhead ground wire-wound optical cable according to this embodiment, in which a lid is cut away, FIG. 1B is a partially cutaway side view of FIG. 1A, and FIG. FIG. 2B is a plan view of an overhead ground wire wound type optical cable terminal set plate used in this example, and FIG.
FIG. 3A is a side view, FIG. 3 is a plan view of a first extra length storage sheet used in this example, and FIG. 4 is a plan view of a second extra length storage sheet used in this example. Parts corresponding to those of the conventional overhead ground wire wound optical cable connection box shown in FIGS. 5A and 5B are denoted by the same reference numerals.

In the connection box for an overhead ground wire-wound optical cable of this embodiment, an aluminum overhead wire-wound optical cable terminal set plate 10 made of aluminum is installed in the connection box body 1 so as to be able to enter and exit. The overhead ground wire wrapped optical cable terminal set plate 10 has a clamp portion 11 for loosely clamping the overhead ground wire wrapped optical cable, and a terminal of the overhead ground wire wrapped optical cable is rounded with a bending radius greater than an allowable bending radius. And a plurality of unit guides 13 for guiding a portion of the optical unit drawn out from the terminal of the overhead ground wire wrapped optical cable with a bending radius equal to or greater than an allowable bending radius. Is provided. Guide part 1
2 is an optical cable terminal set plate 1 extending from the edge of the overhead ground wire wound optical cable terminal set plate 10.
It is formed so that its cross section is formed in a U-shape by being folded over 0. The overhead ground wire-wound optical cable terminal set plate 10 has a pin hole 15 for fitting the overhead ground wire-wound optical cable terminal set plate 10 into a pin 14 erected from the bottom of the connection box body 1. A pin slot 16 is provided.

A first extra length storage sheet for looping and storing the extra length of the optical unit of the overhead ground wire wound optical cable on the overhead ground wire wound optical cable terminal set plate 10. 17 and a second extra length storage sheet 18 for looping and storing the extra length of both optical fiber cores and for storing the core connection part of both optical fiber cores, and a connection box main body. 1 are provided so as to be able to enter and exit.
Each of the first and second extra length storage sheets 17 and 18 is formed of a synthetic resin such as polyethylene.

As shown in FIG. 3, the first extra length storage sheet 17 is provided with a plurality of unit guides 19 for guiding a portion where the extra length of the optical unit of the overhead ground wire wound optical cable is looped off. It is configured. These unit guides 19 are formed such that a portion extended from the edge of the first extra-length storage sheet 17 is folded back on the first extra-length storage sheet 17 so that the section thereof has a U-shape. things and,
In some cases, a portion of the first extra-length storage sheet 17 is cut and raised to form a U-shaped cross section. A cut-and-raised hole 20 is provided adjacent to the unit guide 19 formed by the cut-and-raise. In addition, the first extra-length storage sheet 17 also has
A pin hole 15 and a pin long hole 16 for fitting the first extra length storage sheet 17 to a pin 14 erected from the bottom of the connection box main body 1 are provided.

As shown in FIG. 4, the second extra length storage sheet 18 includes a plurality of optical fiber guides 21 for guiding a portion obtained by looping off the extra length of both optical fiber cores, and both optical fiber guides. It is provided with a core wire connection part storage part 22 for housing a core wire connection part of a core wire.

The core wire guide 21 is formed so that a portion extended from the edge of the second extra-length storage sheet 18 is folded over the second extra-length storage sheet 18 so as to form a U-shaped cross section. There is a case where a part of the second extra-length storage sheet 18 is cut and raised, and a cross-section is formed to have a U-shape. The core wire connection portion storage portion 22 is formed so as to cut and raise a part of the second extra length storage sheet 18 so as to have a U-shaped cross section. Cut-and-raised holes 23 and 24 are provided adjacent to the core wire guide 21 formed by the cut-and-raised portion and the wire-connection portion storage portion 22 adjacent thereto. The second extra-length storage sheet 18 also has a pin hole 15 and a pin long hole 16 for fitting the second extra-length storage sheet 18 into a pin 14 erected from the bottom of the connection box body 1. Is provided.

6C is another optical cable (not shown).
Is a cable clamp used when the cable is retracted.

When the overhead ground wire wrapped optical cable terminal set plate 10 is installed in the junction box main body 1 so as to be able to enter and exit, the overhead ground wire wrapped optical cable terminal set plate 10 is installed.
Can be taken out of the connection box body 1 to set the overhead ground wire wound optical cable, and the workability can be improved. Further, a first extra length storage sheet 17 and a second extra length storage sheet 18 are superimposed on the overhead ground wire wound type optical cable terminal set plate 10, and the connection box main body 1
Are placed so that they can enter and exit
The extra length storage sheets 17 and 18 can also be taken out of the connection box main body 1 to facilitate the work. These first and second
The extra-length storage sheets 17 and 18 may be arranged so as to be increased in accordance with the number of optical units and stacked.

[0021]

In the connection box for an optical ground wire-wound optical cable according to the first aspect of the present invention, the overhead ground wire-wound optical cable terminal set plate is installed in the connection box main body so as to be able to enter and exit. The ground wire-wound optical cable terminal set plate can be taken out of the connection box main body to set the overhead ground wire-wound optical cable terminal, thereby improving workability.

In the connection box for an optical ground wire-wound optical cable according to the second aspect of the present invention, since the overhead ground wire-wound optical cable terminal set plate is installed in the connection box main body so as to be able to enter and exit.
The overhead ground wire wrapping type optical cable terminal set plate can be taken out of the connection box main body to set the overhead ground wire wrapping type optical cable, thereby improving workability. Further, the first extra length storage sheet and the second extra length storage sheet are arranged on the overhead ground wire wound type optical cable terminal set plate so as to be able to enter and exit the junction box body. Therefore, the first and second extra-length storage sheets can also be taken out of the connection box main body for easy work.

[Brief description of the drawings]

FIG. 1A is a plan view showing an example of an embodiment of an overhead ground wire wound type optical cable connection box according to the present invention, in which a lid is cut away, and FIG. 1B is a partially cutaway view of FIG. FIG.

FIG. 2A is a plan view of an overhead ground wire wound type optical cable terminal set plate used in this example, and FIG. 2B is a side view of FIG.

FIG. 3 is a plan view of a first extra length storage sheet used in this example.

FIG. 4 is a plan view of a second extra-length storage sheet used in the present example.

FIG. 5A is a plan view of a conventional overhead ground wire wrapped optical cable connection box with a lid cut away, and FIG. 5B is a partially cutaway side view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection box main body 2 Lid 3 Fastener 4 Base plate 5 Guide 6A, 6B Cable clamp 7, 8 Optical unit 9A, 9B Core wire connection part 10 Overhead ground wire winding type optical cable terminal set plate 11 Clamp part 12 Guide part 13 Unit Guide 14 pin 15 pin hole 16 pin long hole 17 first extra length storage sheet 18 second extra length storage sheet 19 unit guide 20 cut-and-raise hole 21 core wire guide 22 core wire connection part storage portion 23, 24 cut-and-raise hole

Claims (2)

[Claims] An overhead ground wire-wound optical cable and an optical cable as a connection partner thereof are drawn into a connection box main body, and the overhead ground wire-wound optical cable and an optical cable as its connection partner are drawn into the connection box main body. The extra length of each exposed optical unit is looped off, the extra length of the optical fiber core exposed from both optical units is looped off, and both optical fiber cores are connected. An overhead ground wire-wound optical cable terminal box, wherein the overhead ground wire-wound optical cable terminal set plate is installed in the connection box body so as to be able to enter and exit, and the overhead ground wire winding is provided. A clamp portion for loosely clamping the overhead ground wire-wound optical cable on the attached optical cable terminal set plate and a terminal of the overhead ground wire-wound optical cable having an allowable bending radius or more. Ground wire wound type optical connection box for cables and a guide portion for guiding the portion of rounded under radius is provided. 2. An overhead ground wire-wound optical cable and its connection partner optical cable are drawn into the connection box main body, and the overhead ground wire-wound optical cable and its connection partner optical cable are connected inside the connection box main body. The extra length of each exposed optical unit is looped off, the extra length of the optical fiber core exposed from both optical units is looped off, and both optical fiber cores are connected. An overhead ground wire-wound optical cable terminal box, wherein the overhead ground wire-wound optical cable terminal set plate is installed in the connection box body so as to be able to enter and exit, and the overhead ground wire winding is provided. A clamp portion for loosely clamping the overhead ground wire-wound optical cable on the attached optical cable terminal set plate and a terminal of the overhead ground wire-wound optical cable having an allowable bending radius or more. And a guide portion for guiding a portion rounded with a bent radius, and a loop of the extra length of the optical unit of the overhead ground wire wound optical cable on the overhead ground wire wound optical cable terminal set plate. A first extra length storage sheet to be taken out and stored, and a second extra length storage portion for looping out and storing the extra length portions of the two optical fiber cores and storing the core connection part of both the optical fiber cores. A connection box for an optical ground wire wound type optical cable, wherein the extra length storage sheets are overlapped and arranged so as to be able to enter and exit the connection box body.