JP4235147B2 - Protective storage method for extra long core wire in optical fiber cable and extra long core wire storage tray in optical fiber cable - Google Patents

Description

  The present invention is used for an aerial closure, an underground cable, an extra length of an optical fiber core in an optical distribution board, protection, storage, etc., and a method for protecting and storing an extra long core in an optical fiber cable and an optical fiber cable It is related with the extra long core wire storage tray in.

  In recent years, extra optical fiber storage trays are provided in optical closures, optical distribution boards, optical termination boxes and the like installed in optical fiber cables in optical communication networks. The optical fibers drawn out from the optical fiber cable are connected to each other by fusion splicing or optical connector connection, and the connection portion and the connection surplus length of the optical fiber are arranged and stored in the extra long fiber storage tray.

  Conventionally, as a method for protecting and storing an extra long core in an optical fiber cable, the connection portion and the extra length of the optical fiber described above are, for example, a soft sheet with a chuck, for example, a ziplock-shaped optical fiber storage sheet made of a vinyl sheet, Protected and stored. The optical fiber storage sheet with a chuck has a rectangular shape, and the chuck portion is formed of a zipper type, a magic tape (registered trademark) type, or the like.

The connection portion and the connection extra length portion where the optical fibers are drawn out from the optical fiber cable are connected in a ring shape, and the optical fibers are put into the optical fiber storage sheet with the chuck one by one, and the chuck portion is closely attached. Is stored. The optical fiber storage sheet with a chuck is in a flat state, and a plurality of optical fiber storage sheets with a chuck are stored in an extra long fiber storage tray (see, for example, Patent Document 1).
JP-A-7-209520

  By the way, in the conventional method for protecting and storing the extra long core wire in the optical fiber cable, there is a problem that an excessive force is applied to the optical fiber because the extra length of the optical fiber is sandwiched between the chuck portions. In addition, since the optical fibers are put into the optical fiber storage sheet with a chuck one by one, there is a problem that the work time becomes long because it takes time.

  The present invention has been made to solve the above-described problems.

In the optical fiber cable according to the present invention, the method for protecting and storing the extra long core wire includes a first direction in which the optical fiber cable extends when the extra length portion of the optical fiber branched from the optical fiber cable is stored in the extra long cord storage tray. And fixing at least one side edge side of the flexible core-protecting sheet made of resin on one surface of the tray base provided in parallel, and connecting the other side edge side of the optical fiber cable to the optical fiber cable. The hook is provided on the other side edge of the core wire protection sheet and is engaged with and disengaged from a locking part provided on one side edge of the tray base. Lock freely ,
The hook portion has a hook shape, and the hook portion is inserted into a notch window portion provided on one side edge of the tray table, and then the hook portion of the hook portion is engaged with one side edge of the tray table. Lock to the stop
And it is characterized in Rukoto for engaging the engagement window portion of the engaging projections provided on both sides of one end edge of the core wire protective sheet provided on both sides of the other side edge of said core wire protective sheet with .

The extra long core wire storage tray in the optical fiber cable of the present invention is an extra long core wire storage tray for storing the extra length portion of the optical fiber branched from the optical fiber cable.
A tray base provided in parallel along a first direction in which the optical fiber cable extends, and at least one side edge side is fixed to one surface of the tray base and the other side edge side covers the periphery of the optical fiber cable. A core protection sheet made of a flexible resin that can be folded back so as to accommodate the extra length of the fiber, a hook provided on the other side edge of the core protection sheet, and the hook e Bei a locking portion provided on disengageably to one side edge of the tray base, the,
The hook portion is configured in a bowl shape, and a notch window portion through which the hook portion can be inserted and removed is provided on one side edge of the tray base, and the locking portion is provided on one side edge of the tray base. Configured to lock the shaped part,
Engagement protrusions provided on both sides of one end edge side of the core wire protection sheet;
It is comprised by the engagement window part provided in the both sides of the other side edge side of the said core wire protection sheet latched by this engagement protrusion part, It is characterized by the above-mentioned.

  As can be understood from the means for solving the above problems, according to the present invention, the periphery of the optical fiber cable is covered with the core wire protection sheet provided on the tray base of the extra length core wire storage tray. In addition, since the core wire protection sheet can be opened and closed with a single touch by the hook portion of the extra length cord storage tray and the locking portion of the tray base, the optical fiber can be taken out in a short time and the extra length portion can be taken without any trouble. Can be stored.

  Further, the optical fiber is not sandwiched between the hook portions as in the prior art.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1 and FIGS. 2A and 2B, the branch connection portion of the optical fiber cable 1 is, for example, an optical closure (not shown) at an arbitrary position of the optical fiber cable 1 (hereinafter simply referred to as “optical cable”). The extra long core wire storage tray 3 according to this embodiment is provided in the optical closure.

  Further, the extra long core wire storage tray 3 is provided with a tray base 5 in parallel in a state along the first direction in which the optical cable 1 extends, and a flexible resin core wire protection sheet 7 is provided. In a state where it is developed on one surface of the tray base 5, at least one side edge 7A side parallel to the first direction of the core wire protection sheet 7 is one side edge 5A side (one side parallel to the first direction). It is fixed on the edge side. Preferably, the core wire protection sheet 7 may be fixed to the other side edge 5B side of the tray base 5 or may be fixed to the entire surface of the tray base 5 by sticking or other methods. Moreover, it is desirable that the core wire protection sheet 7 has not only flexibility but also resilience (having a reaction force to return to the original flat developed state).

  Further, the core wire protection sheet 7 is widely deployed so that the other side edge 7B facing the one side edge 7A covers the periphery of the optical cable 1 and can be gently folded back to the one side edge 7A. Therefore, it is desirable that the width of the one surface of the tray table 5 is expanded at least twice as large as the width of the surface of the tray base 5 (the dimension in the second direction orthogonal to the first direction). Further, in this embodiment, the other side edge 7B of the core wire protection sheet 7 is substantially at the center of the other side edge 7B of the core wire protection sheet 7, as shown in FIGS. 1 and 2A, for example. A protruding portion 9 protruding to a certain width is provided, and a hook portion 11 having a hook-shaped portion 11A is provided at the tip of the protruding portion 9. Furthermore, the engagement window part 13 is provided in the both ends of the 1st direction of the other side edge 7B of the core wire protection sheet 7. FIG.

  On the other hand, a notch window portion 15 through which the hook portion 11 and the protruding portion 9 of the core wire protection sheet 7 can pass is provided in the center of the one side edge 5A of the tray base 5 in the first direction. The one side edge 5 </ b> A of the tray base 5 located in the notch window portion 15 serves as a locking portion 17 for locking the hook portion 11. Furthermore, on both end sides in the first direction of one side edge 5A of the tray base 5, engagement protrusions 19 for engaging the engagement window portions 13 of the core wire protection sheet 7 are provided.

  Referring also to FIG. 3, in this embodiment, the optical cable 1 is an SZ slot type optical cable. For example, a plurality of tension members 23 as a tensile strength member provided at the center of the slot rod 21, which are twisted together 7 For example, an optical fiber ribbon 27 as a plurality of layers of optical fibers housed in a plurality of slot grooves 25 arranged on the outer periphery of the tension member 23 and the slot rod 21, here a four-core tape laminated in five layers An optical cable core 31 is composed of the core wire 27 and, for example, a metal tape as the presser winding 29 pressed and wound around the outer periphery of the slot rod 21. Further, the outer periphery of the optical cable core 31 is covered with a sheath 33 such as polyethylene resin.

  As shown in FIG. 4, the above-described four-core ribbon 27 is formed by coating, for example, an optical fiber 35 as four optical fibers with, for example, a collective UV resin 37 as a collective coating resin. It is. Each of the optical fiber strands 35 is made by coating the outer periphery of, for example, 125 μmφ quartz glass 39 as an optical fiber with a UV resin 41 to 250 μmφ.

  Referring again to FIG. 1, the optical cable 1 is configured to pass inside the core wire protection sheet 7, and the length of the core wire protection sheet 7 in the longitudinal direction (first direction) is within the optical closure. The sheath 33 of the optical cable 1 is removed to the extent. At the sheath removal portion from which the sheath 33 has been removed, the optical fiber ribbon 27 is easily taken out, and the optical fiber 35 to be branched from the optical fiber ribbon 27 is taken out and cut out. The optical fiber 35 that has been cut out and becomes free on one side is connected to an optical fiber of another optical cable (not shown) by fusion bonding or optical connector connection. The connected optical fiber 35 is provided with a surplus portion and is disposed so as to be accommodated inside the core wire protection sheet 7.

  With the above configuration, the other side edge 7B side having the hook portion 11 of the core wire protection sheet 7 is connected to the sheath removal portion of the optical cable 1 and the extracted optical fiber strand 35 as shown in FIG. The hook portion 11 of the projecting portion 9 is folded so as to cover the surplus length portion, and the tray table 5 has one hook portion 11 as shown in FIGS. 2 (A), (B), 6 and 7. The side edge 5A is inserted through a notch window portion 15 provided substantially at the center in the longitudinal direction (first direction). Next, since the resilient repulsion of the core wire protection sheet 7 applies a biasing force toward the outer side of the tray base 5 (second direction on the left side in FIG. 2B), FIG. 2B and FIG. As shown in FIG. 4, the hook-shaped portion 11A is moved downward and the hook-shaped portion 11A engages with the engaging portion 17 of the one side edge 5A of the tray base 5 and is easily locked.

  With the locking operation of the hook portion 11 of the core wire protection sheet 7, the engagement window portions 13 provided on both sides of the hook portion 11 of the core wire protection sheet 7 are the first side edges 5 </ b> A of the tray base 5. The engagement protrusions 19 on both ends in the direction are almost automatically engaged and locked.

  Moreover, what is necessary is just to perform the reverse of the locking operation | movement mentioned above in order to cancel | release the locked state of the hook part 11 of said core wire protection sheet 7. FIG. That is, as shown in FIG. 7, when the hook portion 11 of the protruding portion 9 is pulled upward in the direction of the arrow, the hook-shaped portion 11 </ b> A at the tip of the hook portion 11 is detached from the locking portion 17 of the tray base 5. The engagement window 13 of the core wire protection sheet 7 is also disengaged from the engagement protrusion 19 of the tray base 5.

  Next, the hook-shaped portion 11 </ b> A at the tip of the hook portion 11 is notched in the tray table 5 while taking care that the engagement window portion 13 of the core wire protection sheet 7 does not engage with the engagement protrusion 19 of the tray table 5. By moving downward through the window portion 15, the hook portion 11 and the protruding portion 9 are easily removed and the locked state is released.

  Therefore, the periphery of the optical cable 1 is covered with the core wire protection sheet 7 provided on the tray base 5 of the extra long core storage tray 3 and the hook portion 11 of the extra long core storage tray 3 and the tray base 5 are engaged. Since the core wire protective sheet 7 can be opened and closed with one touch by the stop portion 17, the connecting portion and the extra length portion of the optical fiber 35 can be taken out and stored in a short time without trouble. Further, the optical fiber 35 is not sandwiched between the hook portions 11 at all.

  In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In the above-described embodiment, the hook portion 11 and the locking portion 17 are provided as a pair at one location, but may be provided at two locations or more locations.

  Further, in the above-described embodiment, the extra long core storage tray 1 provided in an imaginary optical closure has been described as an example. However, extra lengths of optical closures, underground cables, optical distribution boards, etc. in other places are used. It is also applied to the core wire storage tray.

It is a perspective view which shows the extra long core wire storage tray of embodiment of this invention. (A), (B) is sectional drawing of the arrow II-II line | wire of FIG. It is sectional drawing of the optical fiber cable used by embodiment of this invention. It is sectional drawing of an optical fiber tape core wire. It is a perspective view explaining the core wire storing operation | movement of the extra length core wire storage tray following FIG. It is a perspective view explaining the core wire accommodation operation | movement of the extra length core wire storage tray following FIG. It is a perspective view explaining the core wire accommodation operation | movement of the extra long core wire storage tray following FIG. It is a perspective view explaining the core wire storing operation | movement of the extra length core wire storage tray following FIG.

Explanation of symbols

1 Optical fiber cable (optical cable)
3 Extra long core storage tray 5 Tray stand 5A One side edge (of tray stand 5)
5B Other side edge (of tray stand 5)
7 Core wire protection sheet 7A One side edge (of core wire protection sheet 7)
7B Other side edge (of core wire protection sheet 7)
DESCRIPTION OF SYMBOLS 9 Protruding part 11 Hook part 11A Cage-like part 13 Engagement window part 15 Notch window part 17 Locking part 19 Engagement projection part 21 Slot rod 23 Tension member 25 Slot groove 27 Optical fiber tape core wire (optical fiber)
33 sheath 35 optical fiber (optical fiber)

Claims (2)

When the extra length portion of the optical fiber branched from the optical fiber cable is stored in the extra length core wire storage tray, flexibility is provided on one surface of the tray base provided in parallel along the first direction in which the optical fiber cable extends. And fixing at least one side edge side of the core protection sheet made of resin and folding the other side edge side of the core protection sheet so as to cover the periphery of the optical fiber cable and accommodate the extra length portion of the optical fiber. A hook portion provided on the other side edge of the core wire protection sheet and detachably locked to a locking portion provided on one side edge of the tray base ,
The hook portion has a hook shape, and the hook portion is inserted into a notch window portion provided on one side edge of the tray table, and then the hook portion of the hook portion is engaged with one side edge of the tray table. Lock to the stop
Optical fiber cables, characterized in Rukoto for engaging the engagement window portion of the engaging projections provided on both sides of one end edge of the core wire protective sheet provided on both sides of the other side edge of said core wire protective sheet with Protective storage method for extra-long core wires. In the extra length core wire storage tray for storing the extra length portion of the optical fiber branched from the optical fiber cable,
A tray base provided in parallel along a first direction in which the optical fiber cable extends, and at least one side edge side is fixed to one surface of the tray base and the other side edge side covers the periphery of the optical fiber cable. A core protection sheet made of a flexible resin that can be folded back so as to accommodate the extra length of the fiber, a hook provided on the other side edge of the core protection sheet, and the hook e Bei a locking portion provided on disengageably to one side edge of the tray base, the,
The hook portion is configured in a bowl shape, and a notch window portion through which the hook portion can be inserted and removed is provided on one side edge of the tray base, and the locking portion is provided on one side edge of the tray base. Configured to lock the shaped part,
Engagement protrusions provided on both sides of one end edge side of the core wire protection sheet;
An extra long core wire storage tray in an optical fiber cable , comprising an engagement window portion provided on both sides of the other side edge side of the core wire protection sheet locked to the engagement protrusion .

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