JP2010243836A - 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 branching work of an optical fiber cable in an optical fiber cable branch structure. <P>SOLUTION: The optical fiber cable branch structure 70, for which a sheath of the optical fiber cable is removed over a prescribed range and a plurality of optical fiber ribbons included in an optical fiber assembly ribbon taken out from the inside of a slot groove are branched, includes a branching tool body 32 attached to a cable core at the part where the sheath is removed and a protective lid 34 for covering the front surface side of the branching tool body. The branching tool body has the branching tool 30 including: a cable core insertion groove for inserting the cable core and attaching the branching tool body; a guide slit for guiding the plurality of optical fiber ribbons from the inside of the cable core insertion groove to the front surface side; a section part where optical fiber partitions for individually sectioning the plurality of optical fiber ribbons guided to the front surface side are arranged in parallel; and a guide for guiding the plurality of optical fiber ribbons from the guide slit to the section part, wherein the section part side is gradually widened. <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. An optical fiber cable branching structure in which a plurality of optical fiber cores included in the assembly core wire are branched, attached to the cable core of the portion from which the sheath is removed, and a branching tool main body formed in a concave shape on the surface side; A protective lid that is detachably provided on the branching tool body and covers a surface side of the branching tool body, and the branching tool body is provided on the back side, and the cable core of the portion from which the sheath is removed is inserted. A cable core insertion groove for attaching the branching tool main body, and provided at one end of the surface side, and from the inside of the cable core insertion groove to the front side A guide slit for guiding a plurality of optical fiber cores, and a partitioning portion provided in parallel on the front surface side and arranged in parallel with optical fiber partition walls for individually dividing the plurality of optical fiber core wires guided to the front surface side The optical fiber cable branching tool includes: a guiding portion that guides a plurality of optical fiber core wires from the guiding slit to the partitioning portion, and the partitioning portion side gradually widens.

  The optical fiber cable branching structure according to the present invention is branched from the optical fiber assembly core wire taken out from the groove of the slot groove, guided from the groove of the cable core insertion groove to the surface side by the guide slit, A plurality of optical fiber core wires guided to the partition portion by the guide portion and individually separated by the partition portion, and then drawn to the outside of the branch tool body, and a plurality of optical fiber core wires drawn to the outside of the branch tool body A plurality of branch optical fiber wires each having a protective tube that covers and protects the optical fiber core wire and a sheath holding connector that is attached to the tips of the plurality of optical fiber core wires coated with the protective tube. Is preferred.

  An optical fiber cable branching method according to the present invention is an optical fiber cable branching method in which an optical fiber cable is branched by an optical fiber cable branching tool, and after the sheath of the optical fiber cable is peeled off, a predetermined range of the peeled sheath is removed. The optical fiber assembly core wire is taken out from the groove of the slot groove formed in the cable direction on the cable core of the portion where the sheath is peeled off, and the remaining portion after removing the predetermined range of the peeled sheath is peeled off the sheath Covering a portion of the cable core and branching a plurality of optical fiber cores included in the optical fiber assembly core; and the branching device for the optical fiber cable includes a branching device main body having a concave surface side; A protective lid that is detachably provided on the branching tool main body and covers a surface side of the branching tool main body, and the branching tool main body is provided on the back side. A cable core insertion groove into which the branch body is mounted by inserting the cable core of the part from which the sheath has been peeled, and a plurality of the plurality of the cable core insertion grooves from the inside of the cable core insertion groove to the surface side. A guide slit for guiding the optical fiber core wire and a partition section provided in parallel with a plurality of optical fiber partition walls provided on the surface side and individually dividing the plurality of optical fiber core wires guided to the surface side A plurality of optical fiber core wires from the guide slit to the partition part, and a guide part that gradually becomes wider on the partition part side, and the cable core of the portion from which the sheath is removed is inserted into the cable core insertion groove And inserting the branching device main body, guiding the plurality of optical fiber core wires from the inside of the cable core insertion groove to the surface side with the guide slit and being guided to the surface side. A step of guiding a plurality of optical fiber core wires to the partition portion by the guide portion, and separating the optical fiber core wires guided to the partition portion individually by the optical fiber partition wall, and then pulling out to the outside of the branch tool main body. And a step of covering a plurality of optical fiber core wires drawn to the outside of the branching tool body, a step of attaching the protective lid to the surface side of the branching tool body, and a covering of the protection tube Attaching a sheath gripping connector to the tips of a plurality of optical fiber core wires.

  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 branching device for an optical fiber cable for branching a plurality of optical fiber cores included in an assembly core, the branching device main body having a concave shape on the surface side, and detachably provided on the branching device main body, A protective cover that covers the surface side of the tool body, and the branch tool body is provided on the back side, and a cable core insertion groove for attaching the branch tool body by inserting the cable core of the portion from which the sheath is removed. A guide slit that is provided at one end of the surface side and guides the plurality of optical fiber core wires from the inside of the cable core insertion groove to the surface side, and the surface side A partition section in which optical fiber bulkheads are arranged in parallel to individually separate the plurality of optical fiber cores guided to the surface side, and guide the plurality of optical fiber core wires from the guide slit to the partition section And the said division part side has the guidance | induction part which becomes wide gradually, It is characterized by the above-mentioned.

  In the optical fiber cable branching tool according to the present invention, the cable core insertion groove is formed in a convex shape in the cable core insertion groove, and a positioning convex part that is inserted into the slot groove to position the branching tool body. It is preferable to have.

  In the optical fiber cable branching device according to the present invention, the branching device main body is provided at both ends of the branching device main body, and is fastened by attaching a fastener for fixing the branching device main body to the cable core in a portion where the sheath is removed. It is preferable to have a tool mounting portion.

  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 figure 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 a branch tool main body. In embodiment of this invention, it is a bottom view which shows the structure of a branch tool main body. In embodiment of this invention, it is a side view which shows the structure of a branch tool main body. In embodiment of this invention, it is a top view which shows the structure of a protective cover. In embodiment of this invention, it is a bottom view which shows the structure of a protective cover. In embodiment of this invention, it is a side view which shows the structure of a protective cover. 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 sheath on the cable core of the exposed part. In embodiment of this invention, it is a figure which shows the state which branched the some optical fiber core wire from the optical fiber assembly core wire. 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 process of putting a protection tube on four optical fiber core wires. In embodiment of this invention, it is a figure which shows the state which covered the protective cover on the branch tool main body. In embodiment of this invention, it is a figure which shows the state which attached the outer sheath holding | grip connector to the optical fiber core wire inserted in the protection tube.

  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 wire 20, an optical fiber tape core wire, a multi-fiber optical fiber core wire, or the like in which a plurality of optical fiber core wires 20 a which are a plurality of single core wires are assembled 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.

  Next, the optical fiber cable branching tool 30 will be described.

  FIG. 3 is a diagram illustrating a configuration of the optical fiber cable branching tool 30. The optical fiber cable branching tool 30 includes a branching tool body 32 having a concave surface side, and a protective lid 34 that is detachably provided on the branching tool body 32 and covers the surface side of the branching tool body 32. Yes. 4 is a plan view showing the structure of the branching tool body 32, FIG. 5 is a bottom view showing the structure of the branching tool body 32, and FIG. 6 is a side view showing the structure of the branching tool body 32. . 7 is a plan view showing the configuration of the protective lid 34, FIG. 8 is a bottom view showing the configuration of the protective lid 34, and FIG. 9 is a side view showing the configuration of the protective lid 34.

  As shown in FIG. 5, the branching tool main body 32 is provided on the back side, the cable core insertion groove 36 for attaching the branching tool main body 32, and the guide slit provided on the surface side for guiding the plurality of optical fiber core wires 20a. 38, a partition section 40 for individually dividing the plurality of optical fiber core wires 20a, a guide section 42 for guiding the plurality of optical fiber core wires 20a from the guide slit 38 to the partition section 40, and a branching tool body 32 as a cable core. And a fastener attaching portion 44 for attaching a fastener to be fastened to 12.

  The cable core insertion groove 36 is provided on the back side of the branching tool main body 32 and has a function of inserting the cable core 12 of the portion from which the sheath 14 is removed into the groove and attaching the branching tool main body 32 to the optical fiber cable 10. ing. The cable core insertion groove 36 is formed in a long shape so that the posture of the branching tool main body 32 is stabilized and attached to the cable core 12. The cable core insertion groove 36 is formed with a groove width in which the cable core 12 can be inserted and clamped.

  The cable core insertion groove 36 is formed in a convex shape in the groove, and has a positioning convex portion 46 that is inserted into the slot groove 16 and positions the branch tool main body 32. The positioning convex portion 46 is smaller than the groove width of the cable core insertion groove 36 and is formed in a convex shape with a width that can be inserted into the groove of the slot groove 16.

  Slot groove edge holding grooves 48 that engage and hold the edge portions of the slot grooves 16 in a state of being separated from each other are provided on both sides of the positioning convex portion 46 in a direction substantially parallel to the positioning convex portion 46. The slot groove edge holding grooves 48 are provided so as to engage and hold the opposed slot groove edges of the slot grooves 16 formed in the cable core 12 in a state of being separated from each other and facing away from each other. The slot groove edge holding groove 48 is formed with a groove width that allows the edge of the slot groove 16 to be inserted and sandwiched.

  The guide slit 38 is provided at one end on the surface side of the branching tool main body 32, and a plurality of optical fiber core wires 20 a branched from the optical fiber assembly core wire 20 are connected to the cable core provided on the back side of the branching tool main body 32. It has a function of guiding from the inside of the insertion groove 36 to the surface side of the branching tool main body 32. The guide slit 38 has a guide port 50 for introducing the plurality of optical fiber core wires 20 a into the branching tool main body 32 in the groove of the cable core insertion groove 36. The guide port 50 is formed in the positioning convex part 46, for example. The guide slit 38 is formed in a slope shape with a predetermined inclination angle, for example. The guide slit 38 is formed with a slit width into which a plurality of optical fiber core wires 20a can be inserted.

  The guiding portion 42 guides the plurality of optical fiber core wires 20a from the guiding slit 38 to the partitioning portion 40, and is formed so that the partitioning portion 40 side becomes gradually wider. The guiding portion 42 is formed in a tapered shape so that the width in the direction orthogonal to the guiding direction gradually increases from the guiding slit 38 side toward the partitioning portion 40 side.

  The partition part 40 is provided on the surface side of the branch tool main body 32, and includes a plurality of optical fiber partition walls 52 that divide the plurality of optical fiber core wires 20a individually. The plurality of optical fiber partition walls 52 are formed with a predetermined length in the guiding direction, and are arranged in parallel in a direction substantially orthogonal to the guiding direction. The plurality of optical fiber core wires 20a are individually divided by the plurality of optical fiber partition walls 52 arranged in parallel. As will be described later, the plurality of optical fiber partition walls 52 are preferably formed at intervals at which the protective tube 62 into which the optical fiber core wire 20a is inserted can be detachably inserted.

  The fastener attaching portion 44 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 44 is formed in a substantially arc shape on the surface side. The fastener attaching portion 44 is provided with a convex fastener detachment stopper 54 so that the fastener does not slide, for example.

  The fitting protrusions 56 are provided on both side surfaces of the branch tool main body 32 and have a function of being fitted into fitting openings 58 provided in the protective lid 34 to fix the protective lid 34. The fitting protrusions 56 are provided at one end and the other end of both side surfaces of the branch tool main body 32, for example.

  The protective lid 34 is formed in a concave shape and is detachably provided on the branch tool main body 32. The protective lid 34 covers the surface side of the branch tool main body 32 and has a function of protecting the plurality of optical fiber core wires 20a. The protective lid 34 is formed in a tapered shape so that the width in the direction substantially orthogonal to the guiding direction gradually increases from the guiding slit 38 side toward the partitioning portion 40 side. On both side surfaces of the protective lid 34, there are fitting openings 58 fitted into fitting projections 56 provided on both side surfaces of the branching tool main body 32. The fitting openings 58 are provided at one end and the other end of both side surfaces of the protective lid 34, for example.

  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 the optical fiber cable 10 installed indoors.

  First, a predetermined portion of the sheath 14 in the optical fiber cable 10 is cut. FIG. 10 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. 11 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. 12 is a view showing a state where one optical fiber assembly core wire 20 is taken out. As shown in FIG. 12, a part of the plurality of optical fiber assembly core wires 20 housed in the groove of the slot groove 16 formed in the cable direction in the cable core 12 of the portion where the sheath 14 is peeled off is cut, One optical fiber assembly core wire 20 is taken out from the slot groove 16.

  After one optical fiber assembly core wire 20 is taken out, the remaining portion from which the predetermined range of the peeled sheath 14 has been removed is put on the cable core 12 of the exposed portion. FIG. 13 is a view showing a state in which the sheath 14 is put on the cable core 12 in the exposed portion. In this manner, by cutting a predetermined range, which is a portion having a predetermined length, from the distal end of the sheath 14, the sheath 14 can be prevented from contacting the optical fiber cable branching tool 30. 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, a plurality of optical fiber core wires 20a are branched from the single optical fiber assembly core wire 20 taken out. FIG. 14 is a diagram illustrating a state where a plurality of optical fiber cores 20 a are branched from the optical fiber assembly core 20. As shown in FIG. 14, for example, optical fiber core wires 20 a that are four single core wires are branched from one optical fiber assembly core wire 20.

  Next, the branching tool main body 32 is attached to the cable core 12 from which the sheath 14 has been removed. FIG. 15 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 46 is inserted into the slot groove 16, and the cable core 12 is inserted into the cable core insertion groove 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. In addition, by inserting the positioning convex portion 46 into the slot groove 16, the posture of the branch tool main body 32 can be further stabilized.

  The branch tool main body 32 is fastened and fixed to the cable core 12 by a fastener 60. The fastener 60 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 any position by passing the band 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 mounting portion 44 of the branching tool body 32 and the cable core 12, and the band is locked by the locking part in a state where the branching tool body 32 is fastened and fixed to the cable core 12. Has been. At this time, the band is wound around the fastener detachment stopper 54 provided in the fastener attachment portion 44 to restrict the vertical movement of the band in the vertical direction, and the dropping of the branch tool body 32 more reliably. Can be prevented.

  The fastener 60 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 four optical fiber core wires 20a are introduced into the branch tool body 32 from the guide port 50 formed in the groove of the cable core insertion groove 36 provided on the back side of the branch tool body 32. It is guided to the surface side by a guide slit 38. Then, the four optical fiber core wires 20 a are guided to the partition unit 40 via the guide unit 42. The four optical fiber core wires 20a guided to the partition section 40 are individually divided by a plurality of optical fiber partition walls 52 provided in parallel in a direction substantially orthogonal to the guide direction. The divided four optical fiber core wires 20 a are drawn out to the outside of the branch tool main body 32.

  Next, the protective tube 62 is put on the four optical fiber core wires 20a. FIG. 16 is a diagram illustrating a process of covering the four optical fiber core wires 20a with the protective tube 62. In order to protect the exposed portion of the optical fiber core wire 20a that is drawn out from the branch tool body 32, the optical fiber core wire 20a is covered with a protective tube 62 such as an indoor tube. The protective tube 62 protects the optical fiber core wire 20a and is preferably made of a synthetic resin or the like and has flexibility. By providing the protective tube 62 over the length of the optical fiber core 20a drawn out and exposed to the outside of the branch tool main body 32, the optical characteristics of the optical fiber core 20a can be favorably maintained. The protective tube 62 has an inner diameter into which the optical fiber core wire 20a can be inserted. One end of the protective tube 62 into which the optical fiber core wire 20a is inserted is sandwiched and held by an optical fiber partition wall 52 provided in the partition 40. The protective tube 62 is preferably detachable from the partition 40 due to its elasticity.

  Next, the protective lid 34 is put on the branch tool main body 32. FIG. 17 is a view showing a state in which the protective lid 34 is put on the branch tool main body 32. The protective lid 34 is attached to the branching device main body 32 by fitting the fitting protrusions 56 provided on both side surfaces of the branching device main body 32 and the fitting openings 58 provided on both side surfaces of the protective lid 34. Fixed. Thereby, the site | part of the some optical fiber core wire 20a located inside the branch tool main body 32 is protected.

  Next, a sheath holding connector is attached to the other end of the optical fiber core wire 20a covered with the protective tube 62 to form a branched optical fiber wire. FIG. 18 is a view showing a state in which the outer sheath holding connector 64 is attached to the optical fiber core wire 20 a covered with the protective tube 62. By attaching a sheath holding connector 64 to the other end of the optical fiber core wire 20a covered with the protective tube 62, four branched optical fiber wires 66 are formed. Moreover, by attaching the outer sheath holding connector 64 to the other end of the optical fiber core wire 20a covered with the protective tube 62, exposure of the optical fiber core wire 20a is suppressed, and safety is ensured. As the outer gripping connector 64, for example, an on-site connector including a connector fitting portion, a mechanical splice portion, and a cable outer gripping portion is used. An optical fiber is built in the connector fitting part, and a refractive index matching agent is contained in the mechanical splice part. An optical fiber gripped by the skin gripping member of the cable skin gripping part is attached to the built-in optical fiber. The outer skin grip connector 64 is assembled by connecting. By using such a skin gripping connector 64, workability on site can be further improved. Of course, the connector attached to the other end of the optical fiber core wire 20 a covered with the protective tube 62 is not limited to the outer skin gripping connector 64. Thus, the branching operation of the optical fiber cable 10 is completed, and the optical fiber cable branching structure 70 is formed.

  The number of branches can be increased by adding the optical fiber cable branching tool 30. By providing a plurality of optical fiber cable branching tools 30 in the length direction of the optical fiber cable 10, the optical fiber cable 10 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 said structure, since the structure of the branching tool for optical fiber cables is simple and the size of a branching tool can be made smaller, the width | variety of a cable shaft can be made narrower and space saving is possible. Therefore, even when a large number of various optical fiber cables are densely arranged and the empty space is reduced, the workability and maintainability of the intermediate post-branching operation are improved. In addition, the state after the branching work is compact, and there is no hindrance to the subsequent expansion of other cables.

  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 22 Strength member 26 Cutter 30 Branching tool for optical fiber cables 32 Branching tool main body 34 Protective cover 36 Cable core insertion groove 38 Guide slit 40 Section Portion 42 Guide portion 44 Fastener mounting portion 46 Positioning convex portion 48 Slot groove edge retaining groove 50 Guide port 52 Optical fiber partition wall 54 Fastening tool stopper 56 Fit protrusion 58 Fit opening 60 Fastener 62 Protective tube 64 Skin grip connector 66 Branch optical fiber line 70 Optical fiber cable branch structure

Claims (6)

A plurality of optical fiber core wires included in an optical fiber assembly core wire taken out from a groove of a slot groove formed in the cable direction in the cable core of the portion from which the sheath of the optical fiber cable is removed over a predetermined range An optical fiber cable branching structure,
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, and a protective lid that is detachably provided on the branching tool main body and covers the surface side of the branching tool main body. The branching device main body is provided on the back side, the cable core insertion groove for inserting the branching tool main body by inserting the cable core of the portion from which the sheath is removed, and the one end on the front surface side. A guide slit for guiding the plurality of optical fiber core wires from the inside of the core insertion groove to the surface side, and a plurality of optical fiber core wires provided on the surface side and guided to the surface side are individually divided. An optical fiber comprising: a partition section in which optical fiber partition walls are arranged in parallel; and a guide section that guides a plurality of optical fiber core wires from the guide slit to the partition section, and the partition section side gradually widens. Optical fiber cable branching structure, characterized in that it comprises a branching device cable. The optical fiber cable branching structure according to claim 1,
Branched from the optical fiber assembly core wire taken out from the inside of the slot groove, guided from the inside of the cable core insertion groove to the surface side by the guide slit, and guided to the partition part by the guide part. Protection that covers and protects a plurality of optical fiber core wires drawn out to the outside of the branch tool body and a plurality of optical fiber core wires drawn out to the outside of the branch tool body after being individually separated by the section An optical fiber cable branching structure comprising: a plurality of branch optical fiber wires each having a tube and a sheath holding connector attached to tips of a plurality of optical fiber core wires covering the protective tube. An optical fiber cable branching method for branching an optical fiber cable with an optical fiber cable branching tool,
After peeling off the sheath of the optical fiber cable, a predetermined range of the peeled sheath is removed, and the optical fiber assembly core wire is taken out from the slot groove formed in the cable direction in the cable core of the part where the sheath is peeled off, Covering the remaining portion from which the predetermined range of the peeled sheath has been removed on the cable core of the portion where the sheath has been peeled off, and branching a plurality of optical fiber cores included in the optical fiber assembly core; and
The optical fiber cable branching tool includes a branching tool body having a concave surface side, and a protective cover that is detachably provided on the branching tool body and covers the surface side of the branching tool body. A tool body is provided on the back side, a cable core insertion groove for attaching the branch tool body by inserting the cable core of the part where the sheath is peeled off, and a cable core insertion groove provided on one end of the surface side. A guide slit for guiding the plurality of optical fiber cores from the inside of the groove to the surface side, and a plurality of optical fibers provided on the surface side and individually dividing the plurality of optical fiber core wires guided to the surface side A partition section in which the partition walls are arranged in parallel, and a plurality of optical fiber core wires are guided from the guide slit to the partition section, and the guide section is gradually widened on the partition section side,
The cable core of the portion from which the sheath has been removed is inserted into the cable core insertion groove to attach the branch tool main body, and the plurality of optical fiber core wires are moved from the inside of the cable core insertion groove to the surface side by the guide slit. After guiding the plurality of optical fiber cores guided to the surface side to the partition part by the guide part, and separately dividing the optical fiber cores guided to the partition part by the optical fiber partition; A step of pulling out the branch tool body;
Covering a plurality of optical fiber core wires drawn to the outside of the branch tool body with a protective tube;
Attaching the protective lid to the surface side of the branch tool body;
Attaching a skin gripping connector to the tips of a plurality of optical fiber core wires coated with the protective tube;
An optical fiber cable branching method comprising: A plurality of optical fiber core wires included in an optical fiber assembly core wire taken out from a groove of a slot groove formed in the cable direction in the cable core of the portion from which the sheath of the optical fiber cable is removed over a predetermined range A fiber optic cable branching tool,
A bifurcating body having a concave surface side;
A protective lid that is detachably provided on the branch tool body, and covers a surface side of the branch tool body;
With
The branch tool body is
A cable core insertion groove which is provided on the back side and which inserts the portion of the cable core from which the sheath is removed and attaches the branch tool body;
A guiding slit that is provided at one end of the surface side and guides the plurality of optical fiber core wires from the inside of the cable core insertion groove to the surface side;
A partition portion arranged in parallel with optical fiber partition walls provided on the surface side and individually dividing a plurality of optical fiber core wires guided to the surface side;
A plurality of optical fiber core wires are guided from the guide slit to the partition part, and the guide part gradually becomes wider on the partition part side;
A branching device for an optical fiber cable, comprising: The optical fiber cable branching tool according to claim 4,
The cable core insertion groove is formed in a convex shape in the cable core insertion groove, and has a positioning convex portion that is inserted into the slot groove to position the branch tool main body. . The optical fiber cable branching device according to claim 4 or 5,
The optical fiber is characterized in that the branching tool body has a fastener mounting portion that is provided at both ends of the branching tool body and attaches a fastener for fixing the branching tool body to the cable core in a portion where the sheath is removed. Cable branching tool.

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