JP2012073347A - Coated optical fiber branch member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated optical fiber branch member capable of preventing the damage of a coated optical fiber to be branched.SOLUTION: A coated optical fiber branch member 1 comprises a first part body 2, and a second part body 3 integrally formed with the first part body 2. The first part body 2 and the second part body 3 can be opened/closed through a hinge portion 4. On an inner surface of the first part body 2, a cable storage groove 7 for storing optical cable, and a coated fiber storage groove 8 for storing a coated optical fiber taken out from the inside of the optical cable are formed. On an inner surface of the second part body 3, a cable storage groove 14 for storing the optical cable and forming a cable insertion hole 15 with a circular cross section which cooperates with the cable storage groove 7 and inserts the optical cable therein, and a coated fiber storage groove 16 for storing the coated optical fiber taken out from the inside of the optical cable are formed.

Description

  The present invention relates to an optical fiber core branching member for branching an optical fiber core taken out from the inside of an optical cable.

  As a technique for taking out and branching the optical fiber core from the inside of the optical cable, there is a lead-out method in which the sheath of the optical cable is cut into a ring and the optical fiber core is taken out (see, for example, Patent Document 1).

JP 2009-237537 A

  When branching the optical fiber core wire taken out from the inside of the optical cable as in the above prior art, a dedicated optical fiber core wire branching member may be used. In this case, when a conventional general optical fiber core branch member is attached to the optical cable, the branched optical fiber core wire is covered with the optical fiber core branch member. Can not do. For this reason, the optical fiber core wire may be sandwiched between the optical fiber core wire branching members, or a desired allowable bending radius of the optical fiber core wire may not be ensured, and the optical fiber core wire may be damaged.

  An object of the present invention is to provide an optical fiber core branching member capable of preventing damage to a branched optical fiber core wire.

  The optical fiber core wire branching member of the present invention is formed integrally with a first partial body having a first cable housing groove for housing an optical cable so as to be openable and closable with respect to the first partial body. A second partial body having a second cable housing groove that forms a cable insertion hole through which the optical cable is inserted in cooperation with the housing groove, and at least the first partial body of the first partial body and the second partial body includes In addition, a core wire housing groove for housing the optical fiber core wire taken out from the inside of the optical cable is provided.

  When branching the optical fiber core wire taken out from the inside of the optical cable using the optical fiber core wire branching member of the present invention as described above, with the first part and the second part opened, The optical fiber core wire is accommodated in the core wire accommodating groove of the first partial body, and the optical cable is accommodated in the first cable accommodating groove of the first partial body. In this state, by closing the first partial body and the second partial body, the optical cable is inserted through the cable insertion hole, and the optical fiber core wire is branched. Since the optical fiber core wire is accommodated in the core wire accommodating groove in the state where the first partial body and the second partial body are opened as described above, whether or not the optical fiber core wire is caught is determined. It is possible to visually check whether the bending radius is secured. Therefore, it becomes possible to eliminate the pinching of the optical fiber core and to secure an allowable bending radius of the optical fiber core. Thereby, when attaching an optical fiber core wire branch member to the core wire branch location of an optical cable, damage to the optical fiber core wire taken out from the inside of an optical cable can be prevented.

  Preferably, the depth of at least a part of the first cable housing groove is greater than the depth of the second cable housing groove. In this case, when the optical cable is received in the first cable receiving groove, the optical cable is held by the first partial body. For this reason, since the operator does not need to hold down the optical cable accommodated in the first cable accommodation groove, workability is improved.

  Preferably, any one of the first partial body and the second partial body is provided with a protrusion for locking the first partial body and the second partial body, and the first partial body and the second partial body. On the other side of the partial body, a hole that fits into the protrusion is provided. In this case, when the first partial body and the second partial body are closed, the projecting portion enters the hole so that the first partial body and the second partial body are locked, and the optical cable is optically The fiber core wire branch member is temporarily fixed. For this reason, until the optical cable is permanently fixed to the optical fiber core branching member, the operator manually holds the first partial body and the second partial body so that the optical fiber core wire branching member does not shift with respect to the optical cable. Workability is improved because it is not necessary.

  According to the present invention, it is possible to prevent damage to the branched optical fiber. Thereby, the optical fiber core wire can be sufficiently protected by the optical fiber core wire branching member.

It is a perspective view which shows the external appearance of one Embodiment of the optical fiber core wire branching member concerning this invention. It is a perspective view which shows the process of taking out an optical fiber core wire from the inside of an optical cable. It is a perspective view which shows the process of taking out an optical fiber core wire from the inside of an optical cable. It is a perspective view which shows a mode that a tube is inserted in the core wire penetration hole of the 1st partial body shown in FIG. It is a perspective view which shows the state which accommodated the optical fiber core wire in the core wire accommodation groove | channel of the 1st partial body shown in FIG. It is a perspective view which shows the state which accommodated the optical cable in the cable accommodation groove | channel of the 1st partial body shown in FIG. It is a perspective view which shows the state which closed the 1st partial body and 2nd partial body which were shown in FIG. 1, and fixed both with the binding band. It is a perspective view which shows the state which fixed the attachment location of the tube in the optical fiber core wire branching member shown in FIG. 1 with the binding band.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an optical fiber core branching member according to the invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an appearance of an embodiment of an optical fiber core branching member according to the present invention. In the figure, an optical fiber core branching member 1 of this embodiment is a member for branching an optical fiber core taken out from the inside of an optical cable. The optical fiber core may be a single-core optical fiber or a multi-core optical fiber ribbon.

  The optical fiber core wire branching member 1 is formed of a rubber material or an elastomer material that is soft and easily elastically deformed. The optical fiber core branching member 1 includes a first partial body 2 and a second partial body 3 formed integrally with the first partial body 2. The first partial body 2 and the second partial body 3 can be opened and closed via a hinge portion 4.

  The first partial body 2 includes a cable holding portion 5 and a core wire holding portion 6 provided on the distal end side of the cable holding portion 5.

  A cable housing groove 7 for housing the optical cable 25 (see FIG. 6) is formed on the inner surface of the cable holding portion 5. On the inner surface of the core wire holding portion 6, a core wire housing groove 8 for housing the optical fiber core wire 27 (see FIG. 6) taken out from the inside of the optical cable 25 is formed. The core wire housing groove 8 communicates with the cable housing groove 7 and extends obliquely with respect to the extending direction of the cable housing groove 7.

  A semi-cylindrical protrusion 9 is provided on the inner surface of the core wire holding portion 6 so as to be adjacent to the core wire housing groove 8. The protruding portion 9 is formed with a core wire insertion hole 10 communicating with the core wire housing groove 8.

  The second partial body 3 includes a cable holding portion 11 and a core wire holding portion 12 provided on the distal end side of the cable holding portion 11. The cable holding part 11 forms the cylindrical part 13 in cooperation with the cable holding part 5 when the first partial body 2 and the second partial body 3 are closed.

  A cable housing groove 14 for housing the optical cable 25 (see FIG. 6) is formed on the inner surface of the cable holding portion 11. The cable housing groove 14 has a cable insertion hole 15 having a circular cross section through which the optical cable 25 is inserted in cooperation with the cable housing groove 7 when the first partial body 2 and the second partial body 3 are closed. Form. The depth of the cable housing groove 7 is generally larger than the depth of the cable housing groove 14. In addition, the depth of the cable housing groove 7 may be partially larger than the depth of the cable housing groove 14.

  On the inner surface of the core wire holding portion 12, a core wire housing groove 16 for housing the optical fiber core wire 27 (see FIG. 6) taken out from the inside of the optical cable 25 is formed. The core wire housing groove 16 communicates with the cable housing groove 14 and extends obliquely with respect to the extending direction of the cable housing groove 14. The core wire housing groove 16 is a core wire insertion hole through which the optical fiber core wire 27 is inserted in cooperation with the core wire housing groove 8 when the first partial body 2 and the second partial body 3 are closed. 17 is formed.

  Further, a groove portion 18 having a semicircular cross section that fits with the protrusion 9 is formed on the inner surface of the core wire holding portion 12 so as to be adjacent to the core wire housing groove 16.

  A plurality (three here) of temporary fixing projections 19 and a plurality of (two here) positioning projections 20 are alternately arranged in parallel on the inner surface of the distal end portion of the core wire holding portion 12. . The temporary fixing protrusion 19 has a substantially rectangular parallelepiped shape, and the positioning protrusion 20 has a cylindrical shape. A hooking claw 19 a is provided at the tip of the temporary fixing protrusion 19.

  A plurality of (here, three) through-holes are fitted to the temporary fixing protrusions 19 when the first partial body 2 and the second partial body 3 are closed at the distal end portion of the core wire holding portion 6. 21 and a plurality (two in this case) of through-holes 22 that are fitted to the positioning projections 20 when the first partial body 2 and the second partial body 3 are closed.

  In addition, a pair of band holes 23 through which the binding band 31 (see FIG. 8) passes are formed in the core wire holding portion 6 so as to sandwich the protruding portion 9. A pair of band holes 24 for passing the binding band 31 are formed in the core wire holding part 12 so as to sandwich the groove part 18.

  Next, a process of taking out the optical fiber core 27 from the inside of the optical cable 25 and branching the optical fiber core 27 using the optical fiber core branching member 1 described above will be described. In addition, the 1st partial body 2 and the 2nd partial body 3 of the optical fiber core wire branching member 1 are made into the open state previously.

  First, as shown in FIG. 2A, the position (branch position) where the optical fiber core wire branching member 1 is attached in the optical cable 25 is determined. Then, as shown in FIGS. 2B and 2C, the sheath 26 is cut so as to include the branch position along the cutting line 26 a provided in the sheath 26 of the optical cable 25, and the cut sheath 26 is peeled off. take. The cutting length of the sheath 26 is the distance from the branching position to the terminator (not shown) + the required length inside the terminator + the margin. And the presser winding (not shown) of the range which peeled the sheath 26 in the optical cable 25 is removed.

  Next, as shown in FIGS. 3A and 3B, the optical fiber core wire 27 to be branched is cut and taken out. 3C and 3D, the distal end portion of the peeled sheath 26 is cut by about 10 mm, the sheath 26 is returned to the original position, and then the tape 26 is wound around the sheath 26 and fixed. To do.

  Next, as shown in FIG. 4, a branch core wire wiring tube 29 connected to the optical fiber core branch member 1 is prepared, and the tube 29 is cut to a length from the branch position to the termination device. Then, the tube 29 is inserted into the core wire insertion hole 10 of the optical fiber core wire branching member 1. In addition, the insertion length of the tube 29 is about 20 mm.

  Next, as shown in FIG. 5, the optical fiber core wire 27 taken out from the inside of the optical cable 25 is housed in the core wire housing groove 8 of the first partial body 2. In this state, as shown in FIG. 6, the optical cable 25 is accommodated in the cable accommodating groove 7 of the first partial body 2, and the optical fiber core wire 27 is inserted into the core wire insertion hole 10 and passed through the tube 29. . By using the branch core wire tube 29 in this way, the branched optical fiber core wire 27 can be protected up to the terminator.

  At this time, since the depth of the cable housing groove 7 of the first partial body 2 is larger than the depth of the cable housing groove 14 of the second partial body 3, when the optical cable 25 is housed in the cable housing groove 7, the operator Even if the optical cable 25 is separated from the hand, the optical cable 25 is securely held by the optical fiber core branching member 1 by the elastic force of the optical fiber core branching member 1. This eliminates the need for the operator to hold down the optical cable 25 by hand, thereby reducing the burden on the operator and improving the workability.

  Next, as shown in FIG. 7, the first partial body 2 and the second partial body 3 are closed in a state where the optical fiber core wire branching member 1 is aligned with the core wire drawing position (branch position) of the optical cable 25. At this time, the position of the optical fiber core branching member 1 relative to the optical cable 25 is adjusted so that no load is applied to the optical fiber core 27 in the longitudinal direction and the rotational direction of the optical cable 25.

  Further, when the first partial body 2 and the second partial body 3 are closed, the temporary fixing projection 19 and the positioning projection 20 of the second partial body 3 are inserted into the through holes 21 and 22 of the first partial body 2. Since the hooking claw 19a of the temporary fixing projection 19 is hooked on the first partial body 2 and the first partial body 2 and the second partial body 3 are locked, the optical cable 25 is an optical fiber. Temporarily fixed to the core wire branching member 1. For this reason, the operator can prevent the optical fiber core wire branching member 1 from moving relative to the optical cable 25 until the optical cable 25 is permanently fixed to the optical fiber core wire branching member 1. It is not necessary to hold the second partial body 3 by hand. Therefore, also in this respect, the burden on the operator is reduced, and the workability is further improved.

  Then, as shown in FIG. 7, both end portions of the tubular portion 13 are fixed by the two binding bands 30. As a result, the optical cable 25 is sufficiently fixed to the optical fiber core branching member 1.

  Next, as shown in FIG. 8, the band 31 and the second portion of the first partial body 2 are connected to the binding band 31 with the inner surfaces of the tip portions of the first partial body 2 and the second partial body 3 being in close contact with each other. By tightening through the band hole 24 of the body 3, the attachment portion of the tube 29 in the optical fiber core wire branching member 1 is fixed by the binding band 31.

  As described above, in the present embodiment, the optical cable 25 is inserted into the cable housing groove 7 of the first partial body 2 with the first partial body 2 and the second partial body 3 of the optical fiber core branching member 1 opened. And the optical fiber core wire 27 is received in the core wire receiving groove 8 of the first partial body 2 and then the first partial body 2 and the second partial body 3 are closed. An operator can visually check the state of the optical fiber core wire 27. Therefore, before the first partial body 2 and the second partial body 3 are closed, the optical fiber core wire 27 is sandwiched between the optical fiber core wire branch members 1 and the allowable bending radius of the optical fiber core wire 27 is not secured. Is prevented.

  Further, the provisional protrusion 19 for the temporary fixing is provided in the second partial body 3 and the through hole 21 for fitting with the temporary fixing protrusion 19 is provided in the first partial body 2, so that the optical fiber core branching member is provided in the optical cable 25. Since 1 can be temporarily fixed, the optical fiber core wire branching member 1 is prevented from being displaced with respect to the optical cable 25. Therefore, after the first partial body 2 and the second partial body 3 are closed, the optical fiber core wire 27 is sandwiched between the optical fiber core wire branch members 1 because the optical fiber core wire branch member 1 is displaced. This prevents the allowable bending radius of the optical fiber core 27 from being secured.

  As described above, damage and breakage of the branched optical fiber 27 can be prevented. As a result, it is possible to branch the optical fiber core 27 while ensuring the quality of the optical fiber core 27.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the cable housing groove 7 of the first partial body 2 is made deeper than the cable housing groove 14 of the second partial body 3, but the depth of the cable housing groove 7 and the depth of the cable housing groove 14 are the same. There may be.

  Moreover, in the said embodiment, while forming the core wire accommodation groove | channel 8 in the 1st partial body 2, and forming the core wire accommodation groove 16 in the 2nd partial body 3, when the depth of the core wire accommodation groove 8 is large In addition, the core wire accommodation groove 16 is not necessarily formed in the second partial body 3.

DESCRIPTION OF SYMBOLS 1 ... Optical fiber core wire branching member, 2 ... 1st partial body, 3 ... 2nd partial body, 7 ... Cable accommodation groove (1st cable accommodation groove), 8 ... Core wire accommodation groove, 14 ... Cable accommodation groove (1st 2 cable housing grooves), 15 ... cable insertion holes, 16 ... core wire housing grooves, 19 ... temporary fixing projections, 21 ... through holes (holes), 25 ... optical cables, 27 ... optical fiber core wires.

Claims (3)

A first partial body having a first cable housing groove for housing an optical cable;
A second cable receiving groove formed integrally with the first partial body so as to be openable and closable and forming a cable insertion hole for inserting the optical cable in cooperation with the first cable receiving groove. With two parts,
Of the first partial body and the second partial body, at least the first partial body is provided with a core wire housing groove for housing an optical fiber core wire taken out from the inside of the optical cable. An optical fiber core wire branching member.   2. The optical fiber core branching member according to claim 1, wherein the depth of at least a part of the first cable housing groove is greater than the depth of the second cable housing groove. One of the first partial body and the second partial body is provided with a protrusion for locking the first partial body and the second partial body,
3. The optical fiber core branching member according to claim 1, wherein the other of the first partial body and the second partial body is provided with a hole that fits into the protrusion. 4.

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