JPH0356905A - Structural body for branched part of optical fiber cable - Google Patents

Abstract

PURPOSE:To allow the easy drawing out and branching of branch lines without damaging the fibers even if the branch lines are long-sized by fixing tension member clamps which fix and hold a tension member to a holding frame. CONSTITUTION:The apertures at both ends of a cylindrical outer packaging body 19 are locked hermetically by a cap 20 while nearly parallel disposed optical fiber cables 1 and protective tubes 5 are held penetrated therein. A pair of cable clamps 3 which integrally fix armor sheaths 10 and the protective tubes 5 in the vicinity both ends of the stripped parts A of the armor sheath in the armor body 19 are fixed to the holding frame 18. Further, plural nearly linear guide hole parts 17 to be inserted with the branching cables 4 in a longitudinal direction and the tension members 16 are provided in the protective tubes 5 and the tension members fixed to the holding frame 18 are fixed and held by the clamps 34. Thus, the sure guiding of the branch lines to a desired section is possible even if the branch lines are long-sized and, the inserted branch lines are resistant to breakage.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical fiber cable branch structure.

(Problems to be solved by conventional techniques and inventions) Generally,
Conventionally, when attempting to branch an optical fiber cable installed in an underground conduit, etc., as shown in Fig. 8, the outer sheath C of the branch part b of the cable a is first stripped off by a predetermined length, and then , peel off the outer sheath C of a spaced part d, which is a distance equivalent to the extra connection length from the branched part b, by a predetermined dimension, cut the fiber core e exposed at the spaced part d, and then
The cut fiber core wire e is pulled out. Next, a protective case ``is placed over the branch part b, and a protective tube g is protruded from the protective case ``, and the fiber core vAe (branch line) is inserted into the protective tube g, and then was doing work such as covering it with another protective case h.

Therefore, according to the above-mentioned method, it is troublesome to insert the branch line into the protective tube, and the branch line may have to be pulled out from a place slightly away from the above-mentioned branch at a later date. In such a case, if the branch line is too long, it will not be possible to insert it properly into the protective tube, so a new branch part is provided to prevent the branch line from becoming too long. Therefore, in such a case, the same work as described above must be performed, which is troublesome.

Therefore, in the present invention, we have developed an optical fiber cable that can be easily pulled out and branched without damaging the branch line even if it is a long branch line, and that allows another branch line to be easily drawn out at a later date. The purpose is to provide a branch structure.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, a cylindrical exterior body that surrounds the outer periphery of the outer sheath stripped portion of the optical fiber cable and through which the optical fiber cable is penetrated, and a cylindrical exterior body that is arranged approximately parallel to the optical fiber cable. an optical fiber cable branching structure, comprising: at least one protective tube, the end of which is inserted into the outer housing;
Both end openings of the exterior body are hermetically covered with caps with the optical fiber cable and the protective tube passed through, and inside the exterior body, there is a peel-off portion of the exterior sheath. A pair of cable clamps are provided for collectively fixing the outer sheath near both ends and the protection tube, and the pair of cable clamps are fixed to a holding frame bridging between the two, and the protection tube is fixed to the protection tube. The tube has a plurality of substantially linear guide holes in the long potato direction into which the branch wires are inserted, and a tension member, and a tension member clamp is fixed to the holding frame to fixedly hold the tension member. It is.

(Function) Since the branch line is inserted into the substantially linear guide hole, even if the branch line is long, it can be reliably guided to the target site. Further, since the protective tube includes a tension member, it has excellent strength, and the inserted branch wire is extremely difficult to damage. Additionally, the fiber optic cable and protective tube are securely retained within the housing.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

1 and 2 show an optical fiber cable branch structure according to the present invention, with FIG. 1 being a sectional plan view thereof and FIG. 2 being a sectional side view thereof. This structure is a fiber optic cable l
A case body 2 through which the cable clamp 3 is provided inside the case body 2, and a protective tube into which the branch line 4 from the optical fiber cable 1 (see the simplified perspective view of the installed state in FIG. 7) is inserted. 5. Here,
The optical fiber cable 1 is a spacer in which the optical fiber units 8 are respectively fitted into a plurality of concave grooves provided on the outer peripheral surface 6, as shown in the simplified enlarged perspective view of the main part of the present invention in FIG. 9, and an outer sheath lO covering the spacer 9.
The optical fiber unit 8 is composed of a core, a crund, and a coating layer covering these. It consists of a number of coated optical fibers, a tension member, and an outer covering layer that covers the coated optical fibers and the tension member. In addition, the protective tube 5 has a plurality of grooves 13 arranged substantially linearly in the longitudinal direction on the outer circumferential surface 12, as shown in the cross-sectional views of the protective tube in FIGS. 3 and 6. The tension member 16 is comprised of a smoothing base 14, a covering sheath 15 that covers the smoothing base 14, and a tension member 16 installed in the axial center of the smoothing base 14. Then, the concave groove l3 and the covering sheath 1
5, a substantially linear guide hole 17 into which the branch line 4 from the optical fiber cable 1 is inserted is formed. As shown in FIGS. 1 and 2, the case body 2 includes a cylindrical exterior body 19 in which a holding frame l8 for holding the cable clamp 3 is housed, and openings at both ends of the exterior body 19. 20. I'm guessing 20. The holding frame 18 includes a pair of 41 plate bodies 2L 21
The above-mentioned clamps 3, 3 are attached to both ends. In other words, the clamp 3.3 is fixed to a holding frame which is arranged bridgingly between the two.

As shown in FIG. 3, the clamp 3 consists of an upper prong 22 and a lower prong 23, and the lower surface of the upper prong 22 has recesses 24, 25. 26, and a recess 27. 28.2
9 is provided. And upper and lower bronok 22.

23 and then tighten the fasteners 32, such as bolts, screwed onto the upper block 22 (see Figure 1), and the fasteners 32... are screwed into the lower block 23. 22. 23 is integral, and recesses 24, 2
7 is a cable fitting hole 30 into which the optical fiber cable 1 is fitted, and includes recesses 25, 28 and recesses 26, 29.
is the protective tube fitting hole 3 into which the protective tube 5 is fitted.
It becomes 131. In addition, the lower block 23 is the band plate body 21.
21 with a fixing member 33 such as a bolt. In addition, in FIG. 3, the fasteners 32... are omitted.

Therefore, the upper and lower blocks 22. 23 is integrally formed, not only the cable 1 but also the protective tubes 5, 5 are fixedly held on the clamp 3. In this case, the end 5a of the protective tube 5, as shown in FIG. It is substantially parallel to the optical fiber cable l. Also, cable 1 is connected to clamp 3.
, 3, the outer sheath 10 is peeled off to form a peeled-off part A. In other words, the clamps 3, 3 collectively fix the outer sheath 10 and the protective tube near both ends of the peeled-off part A, and the outer sheath 19 fixes the outer sheath 10 and the protective tube near both ends of the peeled-off part A.
The cable l is passed through the outer periphery of the cable l.

Tension member clamps 34 are fixed to the holding frame 18, and the tension members l6 of the protective tube 5 are fixedly held by the clamps 34. That is, this clamp 34 is, as shown in FIG.
a substantially rectangular parallelepiped-shaped Bronok body 36 having an insertion hole 35;
A fixing bolt 37 (the lth bolt) is screwed onto the block body 36.
(see figure), and the tension member 16 inserted into the insertion hole 35 is fixed and held by tightening with a fixing bolt 37. Moreover, the block body 36
As shown in the figure, it is fixed to a mounting body 38 which is fixed to the holding frame 18 via a fixing member 33. Note that the fixing port 37 is omitted in FIG. 3.

Further, as shown in FIG. 2, the cassob 2o has a main body part 39.
and a disk portion 4o connected to the main body portion 39,
A seal ring 4 such as a circle ring is provided on the outer peripheral surface of the disk portion 40.
A concave circumferential groove 42 into which the groove 1 is fitted is provided. Specifically, the cap 20 is made of a half-piece 43 made of plastic or the like.
．． Consisting of 43 halves, 43. 43 mating surface 44
．． 44 has a concave groove 45. 46. 47 is provided, and the half body 43. 43 are overlapped, the insertion hole 48 through which the cable 1 is inserted, and the protective tube 5
Insertion holes 49, 49 are formed through which the components are inserted. It is desirable to interpose a sealing material between the mating surfaces 44, 44 of the half bodies 43, 43, and between the insertion hole 49 and the protective tube 5. 50 is a half body 43. 43 is an integral band. 74 is an end plate connected to the outer surface of the cap 20.

However, cap 20. 20 is provided with protruding pieces 5l... on the upper and lower ends thereof so as to face each other, and opposing protruding pieces 51. Connecting vi52, 52 is connected between the left and right caps 20. 20 is integrally formed. And the lower protruding piece 51. 51 legs 5
3. 53 are provided, and the legs 53, 53 are fixed to the holding frame l8 via the fixing device 33.

Further, in the center of the holding frame l8, a storage case 54 for the branch line 4 is provided. 54 are provided. It should be noted that an extra length storage sheet 55 is contained within the storage case 54.

As shown in the simplified plan view of the exterior body of the case main body in FIG. 4 and the simplified cross-sectional view of the same in FIG. The cylindrical body 5
Closing body 58.7 which freely closes the slit 56 of No.7.
It consists of 58. That is, the closure body 58 has an upper wall 59;
Side wall 60. 60, and the side wall 60. It consists of an inner flange wall 6L 61 protruding from the lower end of the flange 60, and is trapezoidal in plan view. In addition, the slint 5 of the cylinder body 57
Inverted L-shaped locking portions 6262 are protruded from both ends of the locking portions 62, 62, and the protruding pieces 63. 63 is a longitudinal recess m64 of the closure body 58. 64 is fitted.

Furthermore, the locking portion 62. 62 corresponds to the closure body 58,
In plan view, the area gradually expands from the end to the center.

Therefore, if the left and right closing bodies 5858 are slid in the direction shown by the arrows from the state shown in FIG. 4 toward each other,
Closure body 58. 58 and locking portion 62. 62 move in the direction of approaching each other as shown by the arrows, and the diameter of the cylinder 57 decreases to form the disc part 4 of the cassop 20, as shown in FIGS.
0, and the holding frame 18 and the like are hermetically housed in this exterior body. Conversely, the closure body 58. 58 in the direction of separating them from each other, the closure body 58. 58 is a locking portion 62. 62 and remove the cylinder 57 from the canopy 20.
20, and this case body 2 is disassembled. Further, as shown in FIG. 5, the locking portions 62, 62
Standing piece 65. 65 inner surface has a longitudinal recess if466.
66 is provided so as to face the concave grooves 66, 66.
A sealing material 67 is fitted inside. Note that the closure body 58
．． As shown in FIG. 2, the slot 58 is held closed by a tightening band 68. Therefore, when the case body 2 is in the upright position, the outer cover source '21
The pick-up portion A is hermetically surrounded.

Therefore, the branch structure with grooves as described above has the seventh structure.
As shown in the figure, the optical fiber unit 8 is attached to a branching part 69 of the cable l, and when pulling out the branch line 4, the optical fiber unit 8 to be branched is cut at a separated part 70 that is a predetermined distance l away from the branching part 69. Then, the cut optical fiber unit 8 (branch line 4) is pulled out from the branched part, inserted into the protective tube 5, and the case body 2 is reassembled in a sealed manner.

Incidentally, when pulled out, this branch line 4 is temporarily stored in the storage case 54 shown in FIGS. I and 2.

In FIG. 7, reference numeral 72 denotes a retaining case attached to the separated portion, and a half body 73. Consists of 73. In addition, the seventh
In the figure, only one piece of the guarantee tube 5 is shown to simplify the drawing. Moreover, the nursery school tube 5 is inserted into a lead-in conduit (not shown).

Next, FIG. 6 (■) shows another embodiment of the protective tube 5,
The protective tube 5 in this case consists of the tension member 16, a tube 71 disposed around the outer periphery of the tension member 16, and a covering sheath 15 that covers the tube 71 and the tension member 16. In other words, with the hole of this tube 71, the approximately straight guide hole l7
It is said that

Note that the present invention is not limited to the above-described embodiments, and the design may be changed without departing from the gist of the present invention. Furthermore, it is also preferable to insert a lead-in line into the guide hole 17 in advance for pulling in the branch line 4; This makes it extremely easy to insert the branch wire 4 into the guide hole 17. Further, as the optical fiber cable 1, what is inserted into the recess 7 of the spacer 9 may be an optical fiber (in the illustrated example, it is an optical fiber unit 8), and furthermore, the so-called It may be a tape type optical fiber (consisting of optical fiber cores arranged in parallel and a coating layer covering the optical fiber cores), and the number of Uninotes 8 etc. to be housed is arbitrary. Yes, concave! The number of M7s can be increased or decreased as desired. Further, although four protective tubes 5 are provided in the embodiments shown in FIGS. 1 and 2, the present invention is not limited to this.

Alternatively, a first branch line may be provided in the hole 17 of the protective tube 5, and the branch line l1 from the optical fiber cable 1 may be connected to this branch line in the case body 2.

[Effects of the Invention] Since the present invention has been exploited as described above, it produces the following effects.

Even if the branch line 4 becomes long, the branch line 1 can be reliably inserted into the guide hole 17 without being destroyed, so the branch line 1 can be inserted into the guide hole 17 without being disposed at short intervals. A large number of branch lines 4 can be drawn out from the site, and the branch lines 4 can be guided to various target sites. Further, since the branch line 4 is inserted into the protective tube 5 which is difficult to bend, the branch line 4 has excellent durability. Furthermore, if you want to pull out Uj's branch line 4 at a later date, it has the advantage of being easy to pull out. Also, make sure that the optical fiber cable I and the protective tube 5 are
The cable 1 and the protective tube 5 are held in a stable state within the exterior body 19 because the inside of the exterior body 19 is kept in a tight shape, and the cable 1 and the protective tube 5 are held in a stable state for a long period of time. You can use these.

[Brief explanation of drawings]

FIG. 1 is a sectional plan view of an embodiment of the present invention, FIG. 2 is a sectional side view, FIG. 3 is a simplified enlarged perspective view of main parts, and FIG. 4 is a simplified plan view of the outer bag of the case body. FIG. 5 is a simplified sectional view of the exterior body, FIG. 6 is a sectional view of the guarantee tube, and FIG. 7 is a simplified perspective view of the installation configuration. FIG. 8 is a simplified perspective view showing the conventional branching method lb. 1... Optical fiber cable, 3... Cable clamp, 4... Branch line, 5... Protective tube, 5a...
・End part, ]O... Outer sheath, 16... Tension member, 17... Guide hole, 18... Holding frame, l9
... Exterior body, 20... Canop, 34... Tension member clamp, A... Outer sheath 7, ripping part. Patent applicant Kansai Telecom Technology Co., Ltd. Ryoden Cable Industries Co., Ltd. Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A cylindrical sheath that surrounds the outer periphery of the sheath stripped portion of the optical fiber cable and through which the optical fiber cable is penetrated, and is arranged approximately parallel to the optical fiber cable. and at least one or more protection tubes whose ends are inserted into the exterior body, the openings at both ends of the exterior body being connected to the optical fiber cable and the at least one protective tube, the ends of which are inserted into the exterior body. The protective tube is penetrated and hermetically covered with a cap, and the outer sheath near both ends of the outer sheath peeling part and the protective tube are respectively fixed together in the outer case. a pair of cable clamps are provided, and the pair of cable clamps are fixed to a holding frame arranged bridging therebetween, and the protection tube has a plurality of longitudinally substantially straight lines into which the branch lines are inserted. 1. An optical fiber cable branching structure comprising a guide hole and a tension member, and a tension member clamp fixedly attached to the holding frame to securely hold the tension member.