JP2010243835A - Optical fiber cable branch structure, optical fiber cable branching method, and branching tool for optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further facilitate cable branching work in an optical fiber cable branch structure. <P>SOLUTION: The optical fiber cable branch structure, for which a fusion part formed by removing a sheath of an optical fiber cable and fusing a plurality of first optical fiber ribbons included in an optical fiber assembly ribbon taken out from the inside of a slot groove and a plurality of second optical fiber ribbons provided with a connector on one end is held and branched, includes a branching tool body 32 attached to a cable core and a protective lid 34. The branching tool body has the branching tool 30 including: a cable core engaging part for engaging and attaching the cable core; a guide slit 38 for guiding the plurality of first optical fiber ribbons from the back surface side to the front surface side; a slack storage chamber 44 having a fusion part holding part for holding the fusion part and storing the slack of the plurality of fused first optical fiber ribbons and second optical fiber ribbons; and a plurality of adaptors 46 for which the connectors of the second optical fiber ribbons are connected at one part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical fiber cable branching structure, an optical fiber cable branching method, and an optical fiber cable branching unit used for an intermediate rear branching of an optical fiber cable, and in particular, used for branching an optical fiber cable laid indoors. The present invention relates to an optical fiber cable branching structure, an optical fiber cable branching method, and an optical fiber cable branching tool.

  In an optical transmission line using an optical fiber, for example, in the construction of an optical fiber network, an intermediate post-branching technique is used in which an optical fiber cable is laid and then the optical fiber cable is branched from the middle (for example, (See Patent Documents 1 to 5).

JP-A-8-220390 Special table 2008-501151 gazette Special table 2008-501152 gazette JP 2008-501153 A Special table 2008-501154

  By the way, in the optical fiber cable branching method as described above, since the size of the optical fiber cable branching tool is large, the optical fiber cable branching method is used particularly when a large number of various optical fiber cables are densely arranged. Fiber cable branching was not easy.

  Accordingly, an object of the present invention is to provide an optical fiber cable branching structure, an optical fiber cable branching method, and an optical fiber cable branching tool that make it easier to branch an optical fiber cable and improve the workability during intermediate branch wiring. It is to be.

  An optical fiber cable branching structure according to the present invention is an optical fiber obtained by removing a sheath of an optical fiber cable over a predetermined range and taking out from a slot of a slot groove formed in a cable direction in a cable core of a portion where the sheath is removed. Light branched by holding a fusion part formed by fusing a plurality of first optical fiber cores included in the assembly core wire and a plurality of second optical fiber core wires provided with a connector at one end. A fiber cable branching structure, comprising a branching tool body attached to the cable core of the portion from which the sheath has been removed and having a surface formed in a concave shape, and a protective lid covering the surface side of the branching tool body, The branch tool main body is provided on the back side, and the cable core engaging portion for attaching the branch tool main body by engaging the cable core of the portion from which the sheath is removed, and one end on the surface side A guide slit for guiding a plurality of first optical fiber cores included in the optical fiber assembly core wire from the back side to the surface side of the branching tool body, and provided on the surface side, A surplus length accommodating chamber that has a fused portion holding portion to hold, and stores the surplus lengths of the plurality of fused first and second optical fiber cores in a substantially circular shape; And a plurality of adapters connected to one side of the connectors of the plurality of second optical fiber core wires. The optical fiber cable branching tool is provided.

  An optical fiber cable branching structure according to the present invention is included in an optical fiber assembly core wire taken out from the inside of the slot groove, and a plurality of second optical fibers guided by the guide slit from the cable core engaging portion to the surface side. One optical fiber core, a connector provided at one end to one of the adapters, and a plurality of second optical fiber cores whose other ends are fused to the plurality of first optical fiber cores; It is preferable to provide a plurality of branched optical fiber lines including the fusion part held by the attachment part holding part.

  In the optical fiber cable branching method according to the present invention, after peeling off the sheath of the optical fiber cable, a predetermined range of the peeled sheath is removed, and the slot groove formed in the cable direction on the cable core of the portion where the sheath is peeled off is removed. A fused portion formed by fusing a plurality of first optical fiber cores included in an optical fiber assembly core wire taken out from the groove and a plurality of second optical fiber core wires provided with a connector at one end An optical fiber cable branching method for branching with an optical fiber cable branching tool holding the optical fiber cable, wherein the optical fiber assembly core wire is formed from within a slot groove formed in the cable direction in the cable core of the part where the sheath is peeled off Removing the predetermined range of the peeled sheath and placing the remaining portion on the cable core of the peeled portion of the sheath; The tool includes a branching tool body having a concave surface side, and a protective lid that covers the surface side of the branching tool body. The branching tool body is provided on the back side, and the sheath is removed. A cable core engaging portion that engages a cable core and attaches the branch tool main body, and a plurality of first optical fiber core wires included in the optical fiber assembly core wire are provided at one end on the surface side. A guide slit for guiding from the back side of the main body to the surface side; a fusion slit holding portion that is provided on the surface side and holds the fusion part; and a plurality of fused first optical fiber cores; A surplus length accommodating chamber for accommodating a surplus length of the second optical fiber core bundled in a substantially circular shape, and a plurality of second optical fiber core wires connected to one of the plurality of second optical fiber core connectors. An adapter, and a cable at a portion where the sheath is peeled off The branching tool main body is attached by engaging the cable core with the cable core engaging portion, and the plurality of first optical fiber cores included in the optical fiber assembly core wire are guided from the back side to the surface side of the branching tool body. A step of fusing with the plurality of second optical fiber core wires guided by a slit and connected to one of the adapters by a connector; and holding the fusion part by the fusion part holding part; A step of accommodating the extra lengths of the first optical fiber core wire and the second optical fiber core wire in the extra length accommodation chamber, and a step of attaching the protective lid to the surface side of the branch tool body. It is characterized by.

  An optical fiber cable branching device according to the present invention removes a sheath of an optical fiber cable over a predetermined range, and an optical fiber taken out from a slot of a slot groove formed in a cable direction in a cable core of the portion where the sheath is removed. A plurality of first optical fiber cores included in the assembly core wire and a plurality of second optical fiber core wires each having a connector at one end are branched by holding a fusion part formed by fusion connection. A branching device for an optical fiber cable, comprising a branching device main body formed in a concave shape on the surface side, and a protective lid covering the surface side of the branching device main body, the branching device main body is provided on the back side, A cable core engaging portion that engages the cable core of the portion from which the sheath is removed and attaches the branching tool main body, and a plurality of first lights provided at one end on the surface side and included in the optical fiber assembly core wire A plurality of fused first optical fiber cores, each having a guide slit for guiding the fiber core from the back side to the surface side, and a fusion part holding part that is provided on the surface side and holds the fusion part; An extra length accommodating chamber for accommodating the extra length of the optical fiber and the second optical fiber core in a substantially circular shape, and a connector for the plurality of second optical fiber cores connected to one side, provided on the surface side And a plurality of adapters.

  In the optical fiber cable branching device according to the present invention, it is preferable that the branching device main body has a positioning convex portion that is formed in a convex shape on the back surface side and that is inserted into the slot groove to position the branching device main body. .

  In the optical fiber cable branching device according to the present invention, it is preferable that the branching device main body has a fastener mounting portion for attaching a fastener for fixing the branching device main body to the cable core in a portion where the sheath is removed.

  According to the optical fiber cable branching structure, the optical fiber cable branching method, and the optical fiber cable branching device in the above configuration, the structure of the optical fiber cable branching device is simpler. Even when the cables are densely arranged and the vacant space is reduced, the intermediate post-branching operation becomes easier and workability is improved.

In embodiment of this invention, it is sectional drawing which shows schematic structure of an optical fiber cable. In embodiment of this invention, it is a figure which shows the procedure which takes out an optical fiber assembly core wire from an optical fiber cable. In embodiment of this invention, it is a perspective view which shows the structure of the branch tool for optical fiber cables. In embodiment of this invention, it is a top view which shows the structure of the branch tool for optical fiber cables. In embodiment of this invention, it is a bottom view which shows the structure of the branch tool for optical fiber cables. In embodiment of this invention, it is a side view which shows the structure of the branch tool for optical fiber cables. In embodiment of this invention, it is a figure which shows the state which cut | disconnected the sheath of the optical fiber cable. In embodiment of this invention, it is a figure which shows the state which exposed the cable core. In embodiment of this invention, it is a figure which shows the state which took out one optical fiber assembly core wire. In embodiment of this invention, it is a figure which shows the state which covered the peeled sheath on the cable core of an exposed part. In embodiment of this invention, it is a figure which shows the state which attached the branch tool main body to the cable core. In embodiment of this invention, it is a figure which shows the state which fuse | melted the 1st optical fiber core wire and the 2nd optical fiber core wire which are contained in an optical fiber assembly core wire. In embodiment of this invention, it is a figure which shows the state which accommodated the several 1st optical fiber core wire and 2nd optical fiber core wire which were fuse | melted in the extra length storage chamber. In embodiment of this invention, it is a figure which shows the state which connected the optical fiber side optical fiber core wire which provided the connector in the end to the other end of the adapter. In embodiment of this invention, it is a figure which shows the state which covered the protective cover on the branch tool main body.

  Embodiments of the present invention will be described below with reference to the drawings. First, the configuration of the optical fiber cable 10 will be described. FIG. 1 is a cross-sectional view showing a schematic configuration of the optical fiber cable 10. The optical fiber cable 10 has a configuration in which a sheath 14 is formed on the outer periphery of the cable core 12. The cable core 12 includes a slot member 18 in which a slot groove 16 is formed, and a plurality of optical fiber assembly core wires 20 accommodated in the slot groove 16. The slot groove 16 is formed along the cable length direction. As the optical fiber assembly core 20, an optical fiber tape core, a multi-core optical fiber core, or the like in which the first optical fiber cores 20 a that are a plurality of single cores are aggregated is used. The cable core 12 is provided with a tensile body 22.

  A pair of groove-shaped notches 14c (weakened portions) or thin-walled portions are formed on the outer surface of the sheath 14 along the cable length direction so as to be spaced apart from each other in the circumferential direction. The first part 14a and the second part 14b are divided into two parts. The first portion 14a is a portion where the distance between the notches 14c is relatively small, and the second portion 14b is the other portion, and has a substantially C-shaped cross section.

  FIG. 2 is a diagram illustrating a procedure for taking out the optical fiber assembly core wire 20 from the optical fiber cable 10. As shown in FIGS. 2A and 2B, after the sheath 14 is cut in the circumferential direction by the cutter 26, the sheath 14 is torn from the cut portion by the notch 14c so that the first portion 14a is cut. The cable core 12 is exposed by separating from the two portions 14b.

  Next, as shown in FIGS. 2 (c) and 2 (d), some of the plurality of optical fiber assembly core wires 20 accommodated in the grooves of the slot grooves 16 of the cable core 12 are cut to form slot grooves. 16 can be taken out. The other optical fiber assembly core wire 20 is left in the slot groove 16. Then, by covering the slot groove 16 again with the second portion 14b of the peeled portion covering the cable core 12, it is possible to prevent the optical fiber assembly core wire 20 in the slot groove 16 from going out.

  As will be described later, the plurality of first optical fiber cores 20a included in the optical fiber assembly core wire 20 taken out from the inside of the slot groove 16 are a plurality of second optical fibers provided with connectors at one end on the optical module side. It is fusion spliced with the optical fiber core.

  Next, the optical fiber cable branching tool will be described.

  3 is a perspective view showing the configuration of the optical fiber cable branching tool 30, FIG. 4 is a plan view showing the configuration of the optical fiber cable branching tool 30, and FIG. 5 shows the optical fiber cable branching tool. FIG. 6 is a side view showing the configuration of the optical fiber cable branching tool 30. FIG.

  The optical fiber cable branching tool 30 includes a branching tool main body 32 whose surface side is formed in a concave shape, and a protective lid 34 that covers the surface side of the branching tool main body 32.

  As shown in FIG. 5, the branching tool main body 32 is provided on the back side, and the cable core engaging part 36 for attaching the branching tool main body 32 by engaging the portion of the cable core 12 from which the sheath 14 is removed, and the surface side A guide slit 38 for guiding the plurality of first optical fiber cores 20a included in the optical fiber assembly core wire 20 from the back side to the surface side, and a plurality of first optical fibers provided on the surface side. A plurality of fused first optical fiber cores 20a each having a fused part holding part 42 for holding a fused part of the core wire 20a and a plurality of second optical fiber cores provided with connectors at one end. And a surplus length accommodating chamber 44 for accommodating the surplus lengths of the second optical fiber cores in a substantially circular shape, and a plurality of second optical fiber core wire connectors connected to one side. And an adapter 46.

  The cable core engaging portion 36 is provided on the back side of the branch tool main body 32 and has a function of attaching the branch tool main body 32 to the optical fiber cable 10 by engaging the portion of the cable core 12 from which the sheath 14 is removed. Yes. The cable core engaging portion 36 is formed in a concave shape for inserting and engaging a part of the cable core 12.

  The positioning convex portion 48 is formed in a convex shape on the back side of the branch tool main body 32 and has a function of positioning the branch tool main body 32 by being inserted into the slot groove 16. The positioning convex portion 48 is formed in a convex shape with a width that can be inserted into the slot of the slot groove 16.

  The guide slit 38 is provided at one end on the surface side of the branch tool main body 32 and guides the plurality of first optical fiber core wires 20a included in the optical fiber assembly core wire 20 from the back side to the surface side of the branch tool body 32. It has a function. The guide slit 38 is formed in communication with the guide port 50 that guides the optical fiber assembly core wire 20 into the branching tool main body 32. The guide port 50 is formed in the positioning convex part 48, for example. The guide slit 38 is formed in a slope shape with a predetermined length and a predetermined inclination along the longitudinal direction. The guide slit 38 is formed with a slit width into which the optical fiber assembly core wire 20 can be inserted. An optical fiber assembly core holder 52 that holds the guided optical fiber assembly core 20 is provided in the vicinity of the guide slit 38.

  The extra length accommodating chamber 44 is provided on the surface side of the branching tool body 32, and includes a plurality of first optical fiber cores 20a included in the optical fiber assembly core wire 20, and a plurality of second optical fibers provided with connectors at one end. An extra length of a plurality of fused first optical fiber cores 20a and second optical fiber cores having a fused portion holding portion 42 for holding a fused portion formed by fusing the core wires. Has a function of bundling and storing them in a substantially circular shape.

  The fused part holding part 42 is provided, for example, in a direction intersecting with the guide slit 38 (for example, a substantially orthogonal direction). The fused part holding part 42 has a pair of protruding holding bodies. The pair of holding bodies are formed at an interval at which the fused portion can be inserted and held in a detachable manner.

  The surplus length holding body 54 is provided in the surplus length accommodating chamber 44 and holds the surplus lengths of the plurality of fused first optical fiber cores 20a and second optical fiber cores that are bundled and accommodated in a substantially circular shape. It has a function to do. The surplus length holding body 54 is provided, for example, so as to protrude from the side wall of the branching tool main body 32 or the fusion part holding portion 42 and holds the surplus length by pressing it from above. It is preferable that a plurality of extra length holders 54 are provided in the extra length storage chamber 44.

  The adapter 46 is provided on the surface side of the branching tool main body 32, and a plurality of connectors of the second optical fiber core wires are connected to one of the adapters. For example, a plurality of adapters 46 are provided substantially in the center of the branch tool body 32, and a plurality of adapters 46 are provided in parallel in a direction substantially orthogonal to the longitudinal direction of the branch tool body 32. The adapter 46 is guided by an adapter guide 56 provided so as to protrude from the bottom surface of the branching tool main body 32, and is held and held by an adapter holding body 58. For example, another optical module side optical fiber core wire connected to an optical module and having a connector at one end is connected to the other end of the adapter 46 by a connector. As the adapter 46, an adapter 46 used for general optical fiber connection can be used.

  The branching tool body 32 is preferably provided with a plurality of guiding grooves 59 for individually guiding the optical module side optical fiber cores having connectors at one end into the branching tool body 32. The guide groove 59 is provided at the other end on the surface side of the branching tool main body 32 and has a function of individually guiding a plurality of optical module side optical fiber cores provided with connectors at one end into the branching tool main body 32. Yes. The same number of guide grooves 59 as the adapters 46 are provided in a slit shape in parallel.

  The fastener attaching portion 60 is provided to protrude from one end and the other end of the branch tool main body 32 and has a function of attaching a fastener for fixing the branch tool main body 32 to the cable core 12. For example, the fastener mounting portion 60 is formed in a substantially arc shape on the back surface side. The fastener attaching portion 60 is provided with a convex fastener detachment stop 62 so that the fastener does not slide, for example.

  The cylindrical protrusion 64 is provided on the surface side of the branching tool main body 32, and has a function of fitting a columnar protrusion 66 provided on the protective lid 34 described later to fix the protective lid 34. The cylindrical protrusions 64 are provided at a plurality of locations in the longitudinal direction on the surface side of the branching tool main body 32, for example.

  The protective lid 34 covers the surface side of the branching tool main body 32 and has a function of protecting the optical fiber core wire. The protective lid 34 is provided on the branch tool body 32 so as to be openable and detachable. The protective lid 34 has a columnar protrusion 66 that is fitted into a cylindrical protrusion 64 provided on the surface side of the branching tool main body 32. The cylindrical protrusions 66 are provided at a plurality of locations in the longitudinal direction of the protective lid 34, for example. The protective lid 34 is provided with a slit 68 through which the optical module side optical fiber core wire is passed when the protective lid 34 is put on the branching tool main body 32.

  The branch tool main body 32 and the protective lid 34 are molded using, for example, a synthetic resin. Examples of the synthetic resin include polycarbonate (PC) resin, acrylonitrile-butadiene-styrene (ABS) copolymer resin, and synthetic resin blended with PC resin and ABS resin.

  Next, a method for branching the optical fiber cable 10 will be described. The branching method of the optical fiber cable 10 is used, for example, for branching an optical fiber cable laid indoors.

  First, a predetermined portion of the sheath 14 in the optical fiber cable 10 is cut. FIG. 7 is a diagram illustrating a state where the sheath 14 of the optical fiber cable 10 is cut. The sheath 14 of the optical fiber cable 10 is cut by a cutter 26 or the like. A cut portion 14d is formed in the optical fiber cable 10 after the sheath 14 is cut.

  Next, the sheath 14 at a predetermined portion is peeled off and peeled off, and a predetermined range of the peeled sheath 14 is cut and removed to expose the cable core 12. FIG. 8 is a diagram illustrating a state where the cable core 12 is exposed. A cut in the cable length direction is made from the cut portion 14d of the sheath 14 to the sheath 14 of a predetermined length, and the sheath 14 is peeled off to expose the cable core 12. For example, as shown in FIGS. 1 and 2, separating the first portion 14a from the second portion 14b along the notch 14c may cause the sheath 14 to peel from the cable core 12 and expose the cable core 12. it can. The peeled portion of the sheath 14 is preferably temporarily fixed to a portion of the sheath 14 that is not involved in the work so as not to interfere with the work.

  Next, one optical fiber assembly core wire 20 is taken out from the cable core 12. FIG. 9 is a diagram showing a state where one optical fiber assembly core wire 20 is taken out. As shown in FIG. 9, a part of the plurality of optical fiber assembly cores 20 housed in the slot grooves 16 of the cable core 12 is cut, and one optical fiber assembly core 20 from the slot grooves 16. Take out.

  Next, the remaining portion of the peeled sheath 14 from which the predetermined range has been removed is put on the exposed cable core 12. FIG. 10 is a view showing a state in which the peeled sheath 14 is put on the cable core 12 in the exposed portion. At this time, it is possible to prevent the sheath 14 from coming into contact with the optical fiber cable branching tool 30 by excising a predetermined range which is a portion having a predetermined length from the distal end of the sheath 14. The sheath 14 that covers the cable core 12 can be fixed to the cable core 12 with a tape-shaped fixture or the like. As will be described later, the optical fiber cable branching tool 30 is attached to the portion of the cable core 12 exposed by the partial deletion of the sheath 14.

  Next, the branching tool main body 32 is attached to the cable core 12 from which the sheath 14 has been removed. FIG. 11 is a diagram illustrating a state in which the branching tool main body 32 is attached to the cable core 12. The branch tool main body 32 is attached with the back side thereof directed toward the cable core 12. The positioning convex portion 48 is inserted into the slot groove 16 and the cable core 12 is engaged with the cable core engaging portion 36. Thereby, the branching tool main body 32 is positioned so as to substantially coincide with the axial direction of the cable core 12 and is arranged in the optical fiber cable 10. Further, by inserting the positioning convex portion 48 into the slot groove 16, the posture of the branch tool main body 32 can be stabilized.

  The branch tool main body 32 is fastened and fixed to the cable core 12 by a fastener 70. The fastener 70 has, for example, a structure in which a locking portion having a locking hole is provided at one end of the band, and the band can be locked at an arbitrary position through the locking hole (for example, a so-called insulation lock tie). A binding tool can be used. The band is collectively wound around the fastener attaching portion 60 of the branch portion main body and the cable core 12, and the band is locked by the locking portion in a state where the branch tool main body 32 is fastened and fixed to the cable core 12. ing. At this time, by wrapping the band inside the fastener detachment stopper 62 provided in the fastener attachment portion 60, the movement of the band in the vertical direction is restricted, and the dropping tool main body 32 is more reliably detached. Can be prevented.

  The fastener 70 is not particularly limited as long as the branch tool body 32 can be fastened to the cable core 12, and the branch tool body 32 has a function of holding the cable core 12. You can also. For example, the cable core 12 can be locked by a holding piece, a locking claw, a clip portion, or the like.

  The plurality of first optical fiber cores 20 a included in the optical fiber assembly core 20 are guided into the branch body 32 from the guide port 50 of the branch body 32, and are guided to the surface side of the branch body 32 by the guide slit 38. Be guided. The second optical fiber core wire 74 provided with the connector 72 at one end is connected by inserting the connector 72 into one of the adapters 46.

  Next, the first optical fiber core wire 20a and the second optical fiber core wire 74 included in the optical fiber assembly core wire 20 are fused. FIG. 12 is a view showing a state in which the first optical fiber core 20 a and the second optical fiber core 74 included in the optical fiber assembly core 20 are fused. The first optical fiber core wire 20a and the second optical fiber core wire 74 included in the optical fiber assembly core wire 20 are fused and connected by a fusing machine. For example, as shown in FIG. 12, by tapering a predetermined range on the fusion side of the second optical fiber core 74, the taped portion of the second optical fiber core 74 and the optical fiber assembly core 20 is tape-fused in the state of a tape. In FIG. 12, the optical fiber assembly core wire 20 and the taped portion of the second optical fiber core wire 74 are fused with a four-core tape. Then, the first optical fiber core wire 20a included in the optical fiber assembly core wire 20 and the second optical fiber core wire 74 are fusion-bonded to form a fusion part 76. The fused portion 76 is preferably reinforced with a reinforcing sleeve or the like. For fusion between the first optical fiber core 20a and the second optical fiber core 74 included in the optical fiber assembly core 20, a fusion machine generally used for fusion of optical fibers should be used. Can do.

  Next, the plurality of fused first optical fiber core wires 20 a and second optical fiber core wires 74 are accommodated in the extra-length accommodating chamber 44. FIG. 13 is a view showing a state where a plurality of fused first optical fiber cores 20 a and second optical fiber core wires 74 are accommodated in the extra-length accommodating chamber 44. The plurality of fused first optical fiber core wires 20 a and second optical fiber core wires 74 are wound in a substantially circular shape and are held by a surplus length holder 54. The fused portion 76 between the fused first optical fiber core wire 20 a and the second optical fiber core wire 74 is held by the fused portion holding portion 42.

  Next, the protective lid 34 is put on the branch tool main body 32. By fitting the cylindrical protrusion 64 provided on the branch tool body 32 and the columnar protrusion 66 provided on the protection cover 34, the protection cover 34 is attached to the branch tool body 32 and fixed. Thereby, the optical fiber located inside the branch tool main body 32 is protected. As described above, the branching structure 80 is formed by providing the plurality of branching optical fiber lines 78, and the branching operation of the optical fiber cable 10 is completed.

  Here, an optical fiber side optical fiber 84 provided with connectors 82 at a plurality of other ends is guided into the branching tool main body 32 through the guide groove 59 and connected to the adapter 46. FIG. 14 is a view showing a state in which an optical fiber side optical fiber 84 having a connector 82 at one end is connected to the other end of the adapter 46. FIG. 15 is a view showing a state in which the protective lid 34 is put on the branch tool main body 32. A connector 82 provided at one end of the optical fiber side optical fiber 84 is connected to the other end of the adapter 46.

  The number of branches can be increased by adding the optical fiber cable branching tool 30. By providing a plurality of branching tools in the above configuration in the cable length direction, the optical fiber can be branched in the same procedure. Thus, by attaching a plurality of optical fiber cable branching tools 30 to the cable core 12 at different positions in the length direction, it is possible to more easily cope with an increase in the number of branches according to the number of users. be able to.

  According to the above configuration, the structure of the optical fiber cable branching tool is simple, and the size of the branching tool can be further reduced, so that space can be saved. Therefore, even when a large number of various optical fiber cables are densely arranged and the empty space is reduced, the workability of the intermediate post branching operation is improved. In addition, the state after the branching work is compact, and there is no hindrance to the subsequent expansion of other cables. Further, by storing the extra length of the optical fiber core wire fused in the branching tool and storing the connector connection point, it is not necessary to provide a termination box and a wiring route other than the cable shaft.

  According to the above configuration, most of the sheath peeled off for the intermediate post-branch operation is reused, so that the operation cost of the intermediate post-branch operation can be suppressed.

DESCRIPTION OF SYMBOLS 10 Optical fiber cable 12 Cable core 14 Sheath 16 Slot groove 18 Slot member 20 Optical fiber assembly core wire 20a 1st optical fiber core wire 22 Strength member 26 Cutter 30 Branching tool for optical fiber cables 32 Branching tool main body 34 Protective cover 36 Cable core Engaging portion 38 Guide slit 42 Fused portion holding portion 44 Extra length accommodating chamber 46 Adapter 48 Positioning convex portion 50 Guide port 52 First optical fiber core wire holder 54 Extra length holder 56 Adapter guide 58 Adapter holder 59 Guide groove DESCRIPTION OF SYMBOLS 60 Fastener attachment part 62 Fastening tool removal prevention 64 Cylindrical protrusion 66 Cylindrical protrusion 68 Slit 70 Fastener 72, 82 Connector 74 2nd optical fiber core wire 76 Fusion | fusion part 78 Branching optical fiber line 80 Branching structure body 84 Optical module side light Fiber core

Claims (6)

The sheath of the optical fiber cable is removed over a predetermined range, and a plurality of first optical fibers included in the optical fiber assembly core wire taken out from the slot of the slot groove formed in the cable direction in the cable core of the portion where the sheath is removed An optical fiber cable branching structure that branches by holding a fusion part formed by fusing a core wire and a plurality of second optical fiber core wires provided with connectors at one end,
A branching tool main body attached to the cable core of the portion from which the sheath has been removed and having a concave surface on the surface side, and a protective lid covering the surface side of the branching tool main body, the branching tool main body on the back side A plurality of cable core engaging portions that are provided at one end of the front surface side, and are included in the optical fiber assembly core wire. A guide slit for guiding the first optical fiber core wire from the back side to the surface side of the main body of the branching tool, and a fusion part holding part that is provided on the surface side and holds the fusion part; An extra length accommodating chamber for accommodating the extra lengths of the first and second optical fiber cores bundled together in a substantially circular shape; and the plurality of second optical fiber core wires provided on the surface side. Adapters with one connector connected to the other , Optical fiber cable branching structure, characterized in that it comprises a branching device for optical fiber cables having. The optical fiber cable branching structure according to claim 1,
A plurality of first optical fiber cores included in the optical fiber assembly core wire taken out from the inside of the slot groove and guided from the cable core engaging portion to the surface side by the guide slit, and one of the adapters A connector provided at one end and a plurality of second optical fiber cores fused at the other end to the plurality of first optical fiber cores, and the fusion part held by the fusion part holding part An optical fiber cable branching structure comprising: a plurality of branching optical fiber lines including: After peeling off the sheath of the optical fiber cable, the predetermined range of the peeled sheath is removed, and the optical fiber assembly core wire taken out from the slot groove formed in the cable direction on the cable core of the part where the sheath is peeled off An optical fiber cable branching tool holding a fusion part formed by fusing a plurality of first optical fiber cores included and a plurality of second optical fiber cores provided with a connector at one end. A fiber optic cable branching method for branching,
The optical fiber assembly core wire is taken out from the groove of the slot groove formed in the cable direction in the cable core of the part where the sheath is peeled off, and the remaining part from which the predetermined range of the peeled sheath is removed is removed from the part where the sheath is peeled off. Covering the cable core;
The optical fiber cable branching device includes a branching device main body having a concave surface side, and a protective cover covering the surface side of the branching device main body, the branching device main body is provided on the back side, A cable core engaging part that engages the cable core of the part where the sheath is peeled off and attaches the branching tool main body, and a plurality of first optical fibers provided at one end on the surface side and included in the optical fiber assembly core wire A guide slit for guiding the core wire from the back side to the surface side of the main body of the branching tool, and a fusion part holding part that is provided on the surface side and that holds the fusion part. An extra length accommodating chamber for accommodating the extra lengths of the first optical fiber core and the second optical fiber core in a substantially circular shape; and a connector for the plurality of second optical fiber cores provided on the surface side. A plurality of adapters connected to the
A portion of the cable core from which the sheath has been removed is engaged with a cable core engaging portion to attach the branch tool body, and a plurality of first optical fiber core wires included in the optical fiber assembly core wire are connected to the branch tool body. Guiding from the back side to the front side with the guide slit, and fusing with the plurality of second optical fiber cores connected to one of the adapters by a connector;
Holding the fusion part in the fusion part holding part, and accommodating the plurality of fused first and second optical fiber core wires in the extra length accommodation chamber;
Attaching the protective lid to the surface side of the branch tool body;
An optical fiber cable branching method comprising: The sheath of the optical fiber cable is removed over a predetermined range, and a plurality of first optical fibers included in the optical fiber assembly core wire taken out from the slot of the slot groove formed in the cable direction in the cable core of the portion where the sheath is removed A branching device for an optical fiber cable that branches by holding a fusion part formed by fusion-bonding a core wire and a plurality of second optical fiber core wires provided with connectors at one end,
A bifurcating body having a concave surface side;
A protective lid covering the surface side of the branch tool body;
With
The branch tool body is
A cable core engaging portion that is provided on the back side and engages the portion of the cable core from which the sheath has been removed to attach the branch tool body;
A guide slit that is provided at one end of the surface side and guides the plurality of first optical fiber cores included in the optical fiber assembly core from the back side to the surface side;
Provided on the surface side and having a fused portion holding portion for holding the fused portion, and the extra lengths of the plurality of fused first optical fiber core wires and second optical fiber core wires are substantially circular. An extra-length storage room for bundling and storing;
A plurality of adapters provided on the surface side and connected to one side of the connectors of the plurality of second optical fiber cores;
A branching device for an optical fiber cable, comprising: The optical fiber cable branching tool according to claim 4,
The branching tool main body is formed in a convex shape on the back side, and has a positioning convex part that is inserted into the slot groove and positions the branching tool body. The optical fiber cable branching device according to claim 4 or 5,
The branching tool main body has a fastener mounting portion for attaching a fastener for fixing the branching tool body to the cable core in a portion where the sheath is removed.

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