JP3955804B2 - Optical cable connection closure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical cable connection closure for protecting a connection portion of an optical fiber core wire extending from an optical cable.
[0002]
[Prior art]
As a conventional optical cable connection closure, optical fiber core wires extending from an optical fiber cable are fused and connected, and the fusion connection portion is reinforced with a reinforcing sleeve, and then the extra length of the optical fiber core wire is cored. What was accommodated in the wire | line storage tool is known (for example, refer patent document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-5593 (page 2-3, FIG. 1)
[0004]
[Problems to be solved by the invention]
In recent years, optical fiber cables tend to be multi-core and multi-strip due to the FTTH (Fiber To The Home) concept, and accordingly, the demand for introducing a large number of optical fiber cores in a closure is increasing. In addition, downsizing of the closure itself is also desired. However, in the above prior art, both the fusion spliced portion of the optical fiber core wire and the extra length portion of the optical fiber core wire are stored in the core wire storage device, so the size of the core wire storage device does not have to be large. Therefore, the number of core wire storage devices that can be stored in one closure is limited. Therefore, it has been difficult to accommodate a large number of optical fiber cores in a small closure.
[0005]
An object of the present invention is to provide an optical cable connection closure capable of accommodating many optical fiber core wires at high density.
[0006]
[Means for Solving the Problems]
The present invention relates to an optical cable connection closure for protecting a connection portion of an optical fiber core wire extending from an optical cable, a closure body having an optical cable introduction portion into which the optical cable is introduced, and a connection portion provided in the closure body. A fiber connection storage section for storing the optical fiber, a fiber extra length storage section for storing the extra length of the optical fiber core wire, and a closure main body provided in the closure main body. And a fiber connection portion storage portion and a fiber extra length storage portion are arranged in different regions within the closure body, and the passing fiber storage portion A main body portion in which the fiber core wire is introduced and accommodated, and a lid portion rotatably provided on the main body portion; Parts includes a plurality of storage partitions mounted on the lid portion, is out freely disposed between the housing partition, is characterized in that it has a housing member for accommodating the connection portion.
[0007]
In the present invention, for example, after the optical fiber core wires extending from the optical cable introduced into the closure main body are fusion-bonded, the fusion-bonded portion is accommodated in the fiber connection portion accommodating portion, The extra length of the fiber core wire is stored in the extra fiber length storage section. As described above, the fusion spliced portions of the optical fiber core wires and the surplus lengths of the plurality of optical fiber core wires are collectively stored in different regions in the closure body, respectively. The storage space can be made narrower than when the lengths are stored together in the tray. As a result, many optical fiber cores that are fusion-spliced can be stored in the closure body with high density. The lead-through optical fiber core refers to an optical fiber core without a connection portion that is passed through the closure body without being cut. By providing such a lead-in fiber storage portion for storing the lead-through optical fiber core, the optical fiber core wire extending from one optical cable and the optical fiber core wire extending from the other optical cable are fused. It is possible to realize various connection forms such as a fusion connection between an optical fiber core wire that is branched later from the optical fiber core wire and another optical fiber core wire, as well as a connection mode for connection connection. Furthermore, the fiber connection portion storage portion includes a plurality of storage partitions and a storage member that is disposed so as to be freely inserted and removed between the storage partitions and stores the connection portions. Thereby, the connection part of many optical fiber core wires can be accommodated in space efficiency.

[0009]
Preferably, an optical cable fixture is further provided that is detachably attached to the closure main body and that fixes the optical cable introduced into the closure main body from the optical cable introduction portion to the closure main body. By providing such an optical cable fixing tool, it is possible to prevent the optical cable from shifting and damaging the optical fiber core wire inside the closure. In addition, by making the optical cable fixture detachable from the closure body, multiple types of optical cable fixtures are prepared, and the optical cable fixture to be used is changed according to the type of optical cable introduced into the closure body. It is possible to respond.
[0010]
In this case, preferably, the optical cable introduction part has a plurality of holes through which the optical cable is inserted, and the optical cable fixture includes a stepped base on which the optical cable inserted into each hole is placed, and each step of the base. A pressing plate that presses each optical cable placed on the base. In this case, the optical cable introduced into the closure body is almost straightened by configuring the stepped pedestal so that the mounting position of the optical cable with respect to each step of the pedestal matches the arrangement of the holes of the optical cable introduction part. In this state, it can be fixed by the optical cable fixing tool. Thereby, damage to the optical fiber core wire due to bending of the optical cable can be prevented.
[0012]
Preferably, the outer surface of the closure body has a curved shape corresponding to the wall surface of the manhole. Thereby, when the closure is attached to the wall surface of the manhole, the closure does not protrude more than necessary from the wall surface of the manhole. Accordingly, it is possible to prevent the sewerage work in the manhole from being hindered.
[0013]
In this case, mounting brackets for attaching the closure body to the wall surface of the manhole are provided on both the left and right sides of the closure body, and the mounting bracket has a shape corresponding to the wall surface of the manhole. This eliminates the need for an auxiliary member for attaching the closure to the wall surface of the manhole, which is advantageous in terms of cost and the like.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an optical cable connection closure according to the invention will be described with reference to the drawings.
[0015]
FIG. 1 is a diagram showing an internal structure of an embodiment of an optical cable connection closure according to the present invention, FIG. 2 is a bottom view of the optical cable connection closure, and FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG.
[0016]
1 to 4, an optical cable connection closure (hereinafter simply referred to as a closure) 1 of the present embodiment protects a fusion spliced portion reinforced by fusing optical fiber cores extending from the optical cable. It is attached to the wall of the manhole.
[0017]
The closure 1 has a closure body 4 composed of a pair of sleeves 2 and 3, and the sleeves 2 and 3 are fastened and fixed with a plurality of bolts 5 via a contact plate P provided on the flange portion. The outer surfaces of the sleeves 2 and 3 have a curved shape corresponding to the wall surface of the manhole M (see FIG. 16). A plurality of mounting brackets 6 for mounting the closure body 4 to the wall surface of the manhole M are provided on the contact plate P via bolts 5a on both the left and right sides of the sleeve 2. The mounting bracket 6 has a shape corresponding to the wall surface of the manhole M (see FIG. 16).
[0018]
A cable adapter 8 for introducing the multi-core optical cable 7 into the closure body 4 and a cable adapter 10 for introducing the single-core stainless steel tube optical cable 9 into the closure body 4 are provided at the lower end of the closure body 4. It has been. The cable adapter 8 has a hole 11 through which the multi-core optical cable 7 is inserted. The cable adapter 10 has a plurality (four in this case) of holes 12 through which the single-core optical cable 9 is inserted.
[0019]
The closure body 4 and the cable adapters 8 and 10 have a waterproof structure. Thereby, in the state which installed the closure 1 in the wall surface of the manhole, even if there is water in the manhole, water does not enter the inside of the closure 1.
[0020]
A base plate 13 is fixed to the sleeve 2 with screws. At one end of the base plate 13, an optical cable fixture 14 for fixing the multi-core optical cable 7 introduced into the closure body 4 from the cable adapter 8 and a single core introduced into the closure body 4 from the cable adapter 10. An optical cable fixture 15 for fixing the optical cable 9 is detachably provided.
[0021]
The optical cable fixture 14 has a fixture body 16 attached to the base plate 13. One end of the fixture main body 16 is provided with a pair of gripping members 17 for clamping and holding the optical cable 7, and a tension member (not shown) extending from the optical cable 7 is provided at the other end of the fixture main body 16. A fixing portion 18 is provided for tightening and fixing.
[0022]
The optical cable fixture 15 has a stepped base 20 attached to the base plate 13 via a base 19, and the optical cable 9 is positioned on each upper surface of the upper step 20a and the lower step 20b of the base 20. Two cable grooves 21 are provided for each. On the upper part of the upper stage part 20a and the lower stage part 20b of the base 20, pressing plates 22a and 22b for pressing and fixing the optical cables 9 arranged in the cable groove 21 against the upper stage part 20a and the lower stage part 20b are provided. Yes.
[0023]
Here, the arrangement positions of the four cable grooves 21 correspond to the arrangement positions of the holes 12 of the cable adapter 10. Thereby, since the optical cable 9 inserted through each hole 12 of the cable adapter 10 is fixed by the optical cable fixture 15 in a state of extending straight, damage due to bending of the optical cable 9 may be avoided. it can.
[0024]
Further, on the base plate 13, a passing fiber storage portion 23 for storing a passing optical fiber core wire that is not fusion-bonded, and a fusion-bonding portion of the optical fiber core wire that has been fusion-bonded. A fiber fusion splicing portion accommodating portion 24 for accommodating the optical fiber, and a fiber extra length accommodating portion for accommodating the extra length of the optical fiber core wire from when the optical fiber core wire is opened to the fusion splicing portion. 25.
[0025]
The lead-through fiber storage portion 23 is provided on the base plate 13 on the opposite side of the optical cable fixtures 14 and 15. The lead-in fiber housing portion 23 includes a main body portion 26 having protrusions 26a on both sides, and a lid portion 27 that is rotatably provided on the main body portion 26. The lead-through optical fiber core wire is introduced into the main body portion 26 from both sides of the main body portion 26 and stored in a state of being wound in a ring shape so as to ensure a minimum bending radius (for example, 30 mm). At this time, since the protrusions 26 a are provided on both sides of the main body 26, the lead-through optical fiber core housed in the main body 26 does not protrude outside the main body 26.
[0026]
The fiber fusion splicing part accommodating part 24 is disposed on the upper part of the lead-through fiber accommodating part 23. As shown in FIG. 5, the fiber fusion splicing portion storage portion 24 has a plurality of storage partitions 28 fixed to the lid portion 27 of the lead-through fiber storage portion 23. These storage partitions 28 are arranged in the height direction of the closure body 4 (introduction direction of the optical cables 7 and 9). Between each storage partition 28, a storage member 29 for storing a plurality (here, five) of optical fiber cores in a state of being aligned in parallel is stored in a freely removable manner.
[0027]
As shown in FIGS. 6 and 7, the storage member 29 covers both ends of the fusion splicing part 30 so that the fusion splicing part 30 of each stored optical fiber core F does not come out of the storage member 29. Two lid portions 31 are rotatably provided. Further, a handle 32 is provided on one side surface of the storage member 29 so that the storage member 29 can be easily taken in and out between the storage partitions 28.
[0028]
When the fusion splicing portion 30 of the optical fiber core F is accommodated in such a fiber fusion splicing portion accommodating portion 24, first, the plurality of fusion splicing portions 30 are accommodated in the accommodating member 29, and the lid portion 31 is in that state. Is rotated to fix each fusion splicing portion 30 (see FIG. 6). Next, the storage member 29 is inserted between the storage partitions 28 (see FIG. 5). At this time, the fusion splicing portions 30 stored in the storage member 29 are arranged in the thickness direction of the closure body 4. Then, after inserting the necessary number of storage members 29 between the storage partitions 28, the plurality of storage members 29 are pressed together by the lid 33 (see FIG. 5).
[0029]
As described above, since the plurality of storage members 29 storing the fusion splicing portions 30 of the optical fiber core F are arranged in the height direction of the closure main body 4, the thickness of the closure main body 4 is suppressed while being large. The fusion splicing portion 30 can be accommodated. Further, by attaching a number or the like to the storage member 29, it is possible to easily identify the fusion-connected optical fiber core F.
[0030]
The extra fiber length accommodating portion 25 is disposed between the optical cable fixtures 14 and 15 and the through fiber accommodating portion 23. The extra fiber length storage unit 25 has four wiring protectors 34 attached to the base plate 13. Then, the extra length of the optical fiber core F is wound and stored along the wiring protector 34 in a ring shape. In addition, each wiring protector 34 is arrange | positioned so that the minimum bending radius (for example, 30 mm) of an optical fiber core wire may be ensured.
[0031]
By the way, in the structure in which the fusion spliced portion of the optical fiber core and the extra length of the optical fiber core are collectively stored in a dedicated tray, a space in the closure body is taken, so that many optical fiber cores are used. If the fusion splicing part and the extra length are to be stored in the closure body, the thickness dimension of the closure body increases, and it is difficult to reduce the size of the closure.
[0032]
On the other hand, in the closure 1 of the present embodiment, the fusion spliced portion and the extra length of the optical fiber core are not collectively stored in the tray, but the storage region of the spliced splice of the optical fiber and the optical fiber core. Since the storage area for the extra length of the optical fiber is separated, the thickness of the closure body 4 is reduced, and the fusion spliced portions and the extra lengths of many optical fiber cores are stored in the closure body 4 with high density. can do.
[0033]
In addition, since the fiber storage portion 23 is provided in the closure body 4 and the optical cable fixtures 14 and 15 are detachable from the base plate 13, various optical cable connection modes can be realized.
[0034]
For example, when performing a straight connection as shown in FIG. 8, two multi-core optical cables 7 are introduced into the closure 1 as shown in FIG. 9, and the optical fiber cores F extending from the multi-core optical cables 7 are introduced. Splice each other. In this case, since the single-core optical cable 9 is not introduced into the closure 1, the optical cable fixture 15 is not necessary.
[0035]
In addition, when a branch connection as shown in FIG. 10 (one cable is introduced and three cables are led out), four multi-fiber cables 7 are introduced into the closure 1 as shown in FIG. Two of them are used as the main cable 7A, and the other two are used as the branch cable 7B. In this case, four optical cable fixtures 14 are required.
[0036]
At this time, when the connection shown in FIG. 10A is performed, a part of the optical fiber core wire F of the two main cables 7A is led through, and the optical fiber core extending from the remaining main cable 7A. The line F and the optical fiber core F extending from the branch cable 7B are fusion-connected. When the connection shown in FIG. 10B is performed, the optical fiber cores F extending from the two main cables 7A are fused and connected, and further the optical fiber core extending from the main cable 7A. The line F and the optical fiber core F extending from the branch cable 7B are fusion-connected.
[0037]
In the case of performing a connection in which the branched optical fiber is pulled down to the subscriber side by the branch connection as shown in FIG. 12, three multi-core optical cables 7 and, for example, four as shown in FIG. Are introduced into the closure 1. Then, two of the three multi-core optical cables 7 are used as the main cable 7A, and the other one is used as the branch cable 7B. In this case, three optical cable fixtures 14 and one optical cable fixture 15 are required.
[0038]
At this time, when the connection shown in FIG. 12A is performed, a part of the optical fiber core wire F of the two main cables 7A is passed through, and the optical fiber core extending from the remaining main cable 7A is passed. The optical fiber core F extending from the main cable 7A and the optical fiber core f extending from the single-core optical cable 9 are fused and connected to the optical fiber core F extending from the branch cable 7B. Make a fusion splice. Further, when the connection as shown in FIG. 12B is performed, the optical fiber cores F extending from the two main cables 7A are fusion-connected, and the optical fiber cores extending from the main cable 7A are connected. F and the optical fiber core F extending from the branch cable 7B are fused and connected, and the optical fiber core F extending from the main cable 7A and the optical fiber core f extending from the single-core optical cable 9 are connected. Make a fusion splice.
[0039]
Further, when the connection is made such that the branched optical fiber core is pulled down to the subscriber side as shown in FIG. 14, two multi-core optical cables 7 and, for example, eight single-core optical cables as shown in FIG. 9 is introduced into the closure 1. In this case, two optical cable fixtures 14 and two optical cable fixtures 15 are required.
[0040]
At this time, when the connection shown in FIG. 14A is performed, a part of the optical fiber cores F of the two optical cables 7 is led through, and the optical fiber cores F extending from the remaining optical cables 7 are passed. And an optical fiber core wire f extending from the single optical fiber cable 9 are fusion-connected. Further, when the connection as shown in FIG. 14B is performed, the optical fiber cores F extending from the optical cables 7 are fused and connected, and the optical fiber core F extending from the optical cable 7 is connected to the optical fiber core F. The optical fiber core wire f extending from the core optical cable 9 is fusion-connected.
[0041]
When the closure 1 configured as described above is attached to the manhole, as shown in FIG. 16, the mounting bracket 6 is attached to the wall surface of the manhole M by the bolt 35 so that the optical cable introduced into the closure 1 is positioned on the lower side. Fix it. At this time, since the outer surface of the closure body 4 and the mounting bracket 6 have a shape that matches the wall surface of the manhole M as described above, the closure 1 is installed without protruding more than necessary from the wall surface of the manhole M. It becomes a state. Therefore, when the site worker performs a sewerage operation or the like in the manhole M, the closure 1 is not obstructed and the work is not difficult. Moreover, since an auxiliary part for attaching the closure 1 to the wall surface of the manhole M is not required, the closure 1 can be easily and inexpensively installed.
[0042]
The base plate 13 to which the optical cable fixtures 14 and 15, the lead-through fiber storage portion 23, the fiber fusion splicing portion storage portion 24 and the fiber extra length storage portion 25 are attached is fixed to the closure body 4 with screws. Therefore, in the state where the closure 1 is installed in the manhole M, it is possible to easily perform the connecting and storing work of the optical fiber core wire.
[0043]
The optical cable connection closure according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the lead-through optical fiber core 23 is provided to accommodate the lead-through optical fiber core. However, the present invention is applicable to a closure that does not contain the lead-through optical fiber core. Applicable.
[0044]
In the above-described embodiment, the fiber fusion splicing part storage part 24 and the fiber extra length storage part 25 are arranged side by side in the height direction of the closure body 4. The arrangement place of the long storage portion 25 is not particularly limited to this, and in short, the fusion splicing portion of the optical fiber core wire and the extra length of the optical fiber core wire are stored in different regions in the closure body 4. Any configuration may be used.
[0045]
【The invention's effect】
According to the present invention, the fiber connection portion storage portion for storing the connection portion of the optical fiber core wire and the fiber extra length storage portion for storing the surplus length of the optical fiber core wire are different in the closure body. Since it is arranged in the region, for example, many optical fiber cores that are fusion-spliced can be stored in the closure body with high density.
[Brief description of the drawings]
FIG. 1 is a diagram showing an internal structure of an embodiment of an optical cable connection closure according to the present invention.
FIG. 2 is a bottom view of the optical cable connecting closure shown in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is an exploded view of the fiber fusion splicing part accommodating part shown in FIG. 1;
6 is a side view of the storage member shown in FIG. 5. FIG.
7 is a plan view of the storage member shown in FIG. 5. FIG.
8 is a diagram showing an embodiment of an optical cable connection method applied in the optical cable connection closure shown in FIG. 1; FIG.
9 is a diagram showing a method for introducing an optical cable in the connection form of the optical cable shown in FIG.
10 is a diagram showing an embodiment of an optical cable connection method applied in the optical cable connection closure shown in FIG. 1. FIG.
11 is a diagram showing an optical cable introduction method in the optical cable connection configuration shown in FIG. 10;
12 is a diagram showing an embodiment of an optical cable connection method applied in the optical cable connection closure shown in FIG. 1; FIG.
13 is a diagram showing an optical cable introduction method in the optical cable connection configuration shown in FIG.
14 is a diagram showing an embodiment of an optical cable connection method applied in the optical cable connection closure shown in FIG. 1. FIG.
15 is a diagram showing an optical cable introduction method in the optical cable connection configuration shown in FIG. 14;
16 is a plan view showing a state in which the optical cable connection closure shown in FIG. 1 is attached to the wall surface of the manhole. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical cable connection closure, 4 ... Closure body, 6 ... Mounting bracket, 7 ... Multi-core optical cable, 8 ... Cable adapter (optical cable introduction part), 9 ... Single-core optical cable, 10 ... Cable adapter (optical cable introduction part), 11 DESCRIPTION OF SYMBOLS ... Hole part, 12 ... Hole part, 13 ... Base plate, 14 ... Optical cable fixing tool, 15 ... Optical cable fixing tool, 20 ... Base, 20a ... Upper step part, 20b ... Lower step part, 22a, 22b ... Pushing plate, 23 ... Pull Through-fiber storage section, 24... Fiber fusion splice section storage section, 25... Fiber extra length storage section, 28... Storage partition, 29.

Claims (5)

In the optical cable connection closure for protecting the connection portion of the optical fiber core wire extending from the optical cable,
A closure body having an optical cable introduction part into which the optical cable is introduced;
A fiber connection portion storage portion provided in the closure body for storing the connection portion;
A fiber extra-length storage part provided in the closure body for storing the extra length of the optical fiber core ;
Provided in the closure main body, and provided with a lead-through fiber storage portion for storing the lead-through optical fiber core wire of the optical cable ,
The fiber connection portion storage portion and the fiber extra length storage portion are arranged in different regions in the closure body ,
The threading fiber storage part has a main body part into which the threading optical fiber core wire is introduced and stored, and a lid part rotatably provided on the main body part,
The fiber connection portion storage portion includes a plurality of storage partitions attached on the lid portion, and a storage member that is detachably disposed between the storage partitions and stores the connection portions. Closure for optical cable connection. The optical cable fixture according to claim 1 , further comprising an optical cable fixture that is detachably attached to the closure main body and that fixes the optical cable introduced into the closure main body from the optical cable introduction portion to the closure main body. Closure for optical cable connection. The optical cable introduction part has a plurality of holes through which the optical cable is inserted,
The optical cable fixture includes a stepped pedestal for placing the optical cable inserted through the holes, and a pressing plate for pressing the optical cables placed on the steps of the pedestal against the pedestal. The optical cable connection closure according to claim 2, further comprising: The optical cable connection closure according to any one of claims 1 to 3, wherein an outer surface of the closure body has a curved shape corresponding to a wall surface of a manhole. On both left and right sides of the closure body, there are provided mounting brackets for attaching the closure body to the wall surface of the manhole,
The optical cable connection closure according to claim 4 , wherein the mounting bracket has a shape corresponding to a wall surface of the manhole.

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