JPH04191713A - Optical fiber core - Google Patents

Optical fiber core

Info

Publication number
JPH04191713A
JPH04191713A JP2321049A JP32104990A JPH04191713A JP H04191713 A JPH04191713 A JP H04191713A JP 2321049 A JP2321049 A JP 2321049A JP 32104990 A JP32104990 A JP 32104990A JP H04191713 A JPH04191713 A JP H04191713A
Authority
JP
Japan
Prior art keywords
optical fiber
pressure
metal tube
fiber core
conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2321049A
Other languages
Japanese (ja)
Other versions
JP2957267B2 (en
Inventor
Hiroaki Sano
裕昭 佐野
Junichi Ota
順一 太田
Shigeru Tanaka
茂 田中
Toshio Onishi
敏夫 大西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kinzoku Co Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Nippon Kinzoku Co Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kinzoku Co Ltd, Sumitomo Electric Industries Ltd filed Critical Nippon Kinzoku Co Ltd
Priority to JP2321049A priority Critical patent/JP2957267B2/en
Publication of JPH04191713A publication Critical patent/JPH04191713A/en
Application granted granted Critical
Publication of JP2957267B2 publication Critical patent/JP2957267B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401Optical cables
    • G02B6/4429Means specially adapted for strengthening or protecting the cables
    • G02B6/443Protective covering
    • G02B6/4431Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

PURPOSE:To prevent damage of an optical fiber as well as simplifying work to take out the optical fiber to the utmost by providing slits along the longitudinal direction of the inner surface of a metallic conduit, and by opening the slits by way of applying lateral pressure from the side of this metallic conduit. CONSTITUTION:In the case when lateral pressure is applied on a metallic conduit 2 in the 180 deg. direction, deformation is small up to a specific amount of pressure, but if it exceed this specific amount of pressure, slit parts come to be in an open shape. When more pressure is added, large tearing strength is concentrated at the head edge of the slits, breaking of a fatigue part is caused and the conduit is torn at this part and opened. At this time, other parts keep a structure curved inward, and accordingly an optical fiber 1 is protected inside of this curved part and is never broken. Subsequently, if the slit parts are expanded outward by inserting a proper jig in the side of the conduit opened in this way, it is possible to take out an optical fiber core from the middle way of the metallic conduit without damaging the optical fiber core.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、耐環境性に優れた金属管に光ファイバを収納
してなる光ファイバ心線の構造に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a structure of an optical fiber core in which an optical fiber is housed in a metal tube with excellent environmental resistance.

(従来の技術) 従来、単線の光ファイバや、複数本のユニット化された
光ファイバ等を、金属管内に収容した金属バイブ被覆光
ファイバ心線が知られている。
(Prior Art) Metal-vib coated optical fiber cores in which a single optical fiber, a plurality of unitized optical fibers, etc. are accommodated in a metal tube are known.

「日立電線」魔9.1990年1月号P37〜40には
、第2図(A)に示すような、外径0゜7〜1、Omm
、肉厚0.1〜0.15mmの金属バイブ21内に、単
線の光ファイバ22を挿入したものや、第2図(B)に
示すような、外径1.5〜3.0mm、肉厚0.1〜0
.2mmの金属バイブ23内に、6本の光ファイバ24
を介在紐25を中心にして被覆26により一括被覆した
ユニットを挿入したものが記載されている。
"Hitachi Cable" Ma 9. January 1990 issue P37-40 has an outer diameter of 0°7 to 1 Omm as shown in Figure 2 (A).
, one in which a single optical fiber 22 is inserted into a metal vibrator 21 with a wall thickness of 0.1 to 0.15 mm, and a vibrator with an outer diameter of 1.5 to 3.0 mm and a wall thickness as shown in FIG. 2(B). Thickness 0.1~0
.. Six optical fibers 24 are placed inside a 2mm metal vibe 23.
A unit is described in which a unit is inserted in which the intervening cord 25 is centrally covered with a covering 26.

また、その製造方法としては、特開昭60−11122
11号公報に記載されているように、光ファイバを前進
させながら、これを緩く包被するように、金属テープを
丸めて順次管状に成形し、縦方向の接合端部を溶接して
金属管を形成するに際して、潤滑材を供給して減径する
方法が知られている。
In addition, the manufacturing method is disclosed in Japanese Patent Application Laid-Open No. 60-11122.
As described in Publication No. 11, while advancing the optical fiber, a metal tape is sequentially rolled into a tube shape so as to loosely cover it, and the longitudinal joint ends are welded to form a metal tube. There is a known method for reducing the diameter by supplying a lubricant when forming the diameter.

ところが、従来のこの種の光ファイバ心線は、金属外被
が極めて堅固であるため、例えば、光ファイバ心線同士
を接続するために、光ファイバを金属管から取り已す場
合や、あるいは、光ファイバ心線の途中で分岐するため
に、光ファイバを取り出す場合などには、光ファイバを
傷つけないために、金属管部をやすりで削るなどしなけ
ればならず、非常な労力が必要であった。
However, since the metal jacket of this kind of conventional optical fiber is extremely strong, for example, when the optical fiber is removed from a metal tube in order to connect optical fibers together, or When taking out an optical fiber to branch in the middle of an optical fiber core, the metal tube section must be filed down to avoid damaging the optical fiber, which requires a great deal of effort. Ta.

(発明が解決しようとする課題) 本発明は、このような光ファイバの取扱い上の問題を解
決するためになされたもので、金属被覆から光ファイバ
を傷つけることなく、容易に取り出すことができる光フ
ァイバ心線を提供することを目的とするものである。
(Problems to be Solved by the Invention) The present invention has been made to solve such problems in handling optical fibers. The purpose is to provide a fiber core.

(課題を解決するための手段) 本発明は、光ファイバを金属管内に収納してなる光ファ
イバ心線において、前記金属管の内面に、その長さ方向
に沿って、切り込みが設けられていることを特徴とする
ものである。
(Means for Solving the Problems) The present invention provides an optical fiber core wire in which an optical fiber is housed in a metal tube, in which a notch is provided on the inner surface of the metal tube along its length. It is characterized by this.

切り込みは、底部が鋭角である楔状とすることができる
The cut can be wedge-shaped with an acute angle at the bottom.

(作用) 本発明は、光ファイバを金属管内に収納してなる光ファ
イバ心線において、前記金属管の内面に、その長さ方向
に沿って、切り込みが設けられている。切り込みは、例
えば、断面形状が、底部が鋭角である楔状である。
(Function) The present invention provides a coated optical fiber in which an optical fiber is housed in a metal tube, in which a cut is provided on the inner surface of the metal tube along its length. The cut has, for example, a wedge-shaped cross-sectional shape with an acute angle at the bottom.

この金属管の側面から、金属管をつぶすような側圧を加
えると、側圧に対して縦方向にある切り込みが開かれ、
切り込みの底部に亀裂が入り、そこから金属管を開くこ
とができ、光ファイバを傷つけることなく取り出すこと
ができる。
When lateral pressure that crushes the metal tube is applied from the side of the metal tube, a notch is opened in the vertical direction against the lateral pressure.
A crack is created at the bottom of the notch, through which the metal tube can be opened and the optical fiber removed without damaging it.

(実施例) 第1図は、本発明の一実施例を説明するためのもので、
同図(A)は、光ファイバ心線をその軸方向に直角に切
断した一部の斜視図、同図(B)〜(D)は、金属管を
開く場合の説明図である。
(Example) FIG. 1 is for explaining an example of the present invention.
FIG. 5A is a perspective view of a part of the optical fiber core cut at right angles to its axial direction, and FIGS.

図中、1は光ファイバ、2は金属管、3は切り込み、4
は側圧、5は金属疲労部である。
In the figure, 1 is an optical fiber, 2 is a metal tube, 3 is a notch, and 4
is the lateral pressure, and 5 is the metal fatigue part.

第1図(A)に示すように、光ファイバ心線の被覆を構
成している金属管2の内側には、90’間隔で、先端が
鋭角となった深い切り込み3が刻まれており、金属管の
中には、光ファイバ1が収納されている。
As shown in FIG. 1(A), deep cuts 3 with acute angles at the tips are cut at 90' intervals on the inside of the metal tube 2 constituting the coating of the optical fiber core. An optical fiber 1 is housed inside the metal tube.

この金属管2に、180°方向、第2図(B)では上下
から、この金属管2に側圧4をかけた°場合、一定圧力
までは変形は小さいが、一定圧力を超えると、切り込み
部が開かれた形となる。さらにもう少し力を加えると、
この切り込みの先端に大きな引き裂き力が集中し、同図
(C)に示すように、切り込みの底部に金属疲労部5が
生じ、同図(D)に示すように、疲労部の破壊が生じて
、その部分の管が裂けて開く。この際、他の部分は内側
向きに湾曲した構造を維持しているから、光ファイバ1
は、この湾曲部内で保護されるため、つぶされることは
ない。
When lateral pressure 4 is applied to this metal tube 2 from the 180° direction (from above and below in Fig. 2 (B)), the deformation is small up to a certain pressure, but when the pressure exceeds a certain pressure, the notch becomes an open shape. If you apply a little more force,
A large tearing force is concentrated at the tip of this notch, and as shown in the same figure (C), a metal fatigue part 5 is generated at the bottom of the notch, and as shown in the same figure (D), the fatigue part is destroyed. , the tube in that area splits open. At this time, since the other parts maintain an inwardly curved structure, the optical fiber 1
is protected within this curved part and will not be crushed.

一方、このようにして開かれた管側に適切な治具を差し
込むことにより、スリット部を外向きに広げて行けば光
ファイバ芯を傷つけることなく、金属管の途中から光フ
ァイバ芯を取り圧すことができる。
On the other hand, by inserting an appropriate jig into the tube that has been opened in this way and expanding the slit outward, the optical fiber core can be removed from the middle of the metal tube and pressurized without damaging the optical fiber core. be able to.

端末についても、管を内から外へ開くような治具により
光ファイバを傷つけることなく容易に金属管を開くこと
ができる。
As for the terminal, a metal tube can be easily opened without damaging the optical fiber by using a jig that opens the tube from the inside to the outside.

試作例について説明する。A prototype example will be explained.

先ず、比較例として、特開昭60−111211号公報
に記載されている方法により、幅6.4mm、厚み0.
19mmのステンレステープを、光ファイバを入れなが
ら溶接造管し、外径2mm、肉厚0.19mmの光ファ
イバ心線を作成した。
First, as a comparative example, a fabric with a width of 6.4 mm and a thickness of 0.0 mm was prepared by the method described in Japanese Patent Application Laid-Open No. 111211/1983.
A 19 mm stainless steel tape was welded into a tube while an optical fiber was inserted thereinto to produce an optical fiber core having an outer diameter of 2 mm and a wall thickness of 0.19 mm.

次に、本発明の実施例として、幅6.4mm、厚み0.
19mmのステンレステープに、造管後の中心軸に対し
て、180°方向となるような位置に、深さ0.16m
rn、模型の底辺幅が0.2mmの溝を2本設け、これ
を比較例と同じ方法で光ファイバを挿入しながら溶接造
管し、外径2mm、最大肉厚0.19mmの光ファイバ
心線を作成した。
Next, as an example of the present invention, the width is 6.4 mm and the thickness is 0.
A 19mm stainless steel tape is placed at a depth of 0.16m at a position 180° to the central axis after pipe making.
rn, two grooves with a base width of 0.2 mm were prepared in the model, and an optical fiber core was welded using the same method as the comparative example while inserting an optical fiber, and an optical fiber core with an outer diameter of 2 mm and a maximum wall thickness of 0.19 mm was made. Created a line.

上記2種の光ファイバについて途中分岐特性について評
価した。
The above two types of optical fibers were evaluated for their midway branching characteristics.

まず、比較例の光ファイバ心線については、第3図(A
)に示すように、光ファイバ31が挿入された金属管3
2の少なくとも1箇所をダイヤモンドカッター33やヤ
スリを用いて、光ファイバ31を傷つけないように細心
の注意を払いつつ、全周を2箇所において切断し、同図
(B)に示すように、切断箇所34に、ニッパ35など
を入れて切り開くか、あるいは、同じくヤスリなどを用
いて開き、同図(C)に示すように、光ファイバを取り
出した。光ファイバを取り出すには、これ以外に適当な
方法はないと思われている。
First, regarding the optical fiber core wire of the comparative example, Fig. 3 (A
), a metal tube 3 into which an optical fiber 31 is inserted
Using a diamond cutter 33 or a file, cut the entire circumference of the optical fiber 31 at at least one point in two places using a diamond cutter 33 or a file, as shown in FIG. The portion 34 was cut open using a nipper 35 or the like, or opened using a file or the like, and the optical fiber was taken out as shown in FIG. 3(C). It is believed that there is no other suitable method for extracting the optical fiber.

このため、切断等に非常な注意力と技術を要し、ニッパ
を使う場合でも、作業時間は18分程度が必要であった
。また、内側向けの管の切断や、管内に刃先を入れての
切り開きのため、管内に挿入されている光ファイバに損
傷を与えることが多かった。
Therefore, cutting requires great care and skill, and even when using nippers, the work takes about 18 minutes. Furthermore, because the tube is cut inward or the cutting edge is inserted into the tube to make an incision, the optical fiber inserted into the tube is often damaged.

一方、実施例の光ファイバ心線については、比較例で行
なった方法と同じ方法を採用してもよいが、この場合で
も、切り込み部をニッパで切断すれば、作業ははるかに
容易である。
On the other hand, for the optical fiber core wire of the example, the same method as that used for the comparative example may be adopted, but even in this case, if the cut portion is cut with nippers, the work is much easier.

また、第4図(A)に示すように、光ファイバ41が挿
入された金属管42に、矢印43で示す側圧をかけて、
切り込み部に応力を集中し、側部を開孔させる。側圧を
かけるには、同図(B)に示すような工具44を用いる
ことができる。同図(C)に示すように、工具の先端部
45は、丸みを帯びた形状であり、これにより金属管4
3を押しつぶすと、金属管3内部の光ファイバに損傷を
与えることなく、側部により大きい応力を集中させるこ
とができる。次に、開かれて強度低下した切り込みを閉
じるようにし、再度側圧をかけて開口させる部分にさら
に大きな応力をかけて切り込みを開口させる。この手順
を踏むことにより、偏平させた金属管の長径方向に、以
降の工程で工具を挿し込むことができ、光ファイバまで
の距離が長いことから、光ファイバに損傷を与えること
が少なくなる。この開口した部分に、同図(D)に示す
ような、光ファイバを傷つけないように、丸めた先端部
46の挿入位置を制限するストッパ47を有する工具4
8を用いて、同図(E)に示すように、開口した部分を
拡げることにより、より簡単に同図(F)に示すように
、途中分岐ができるように光ファイバ41を取り出すこ
とができる。
Further, as shown in FIG. 4(A), side pressure is applied to the metal tube 42 into which the optical fiber 41 is inserted, as indicated by the arrow 43.
Concentrate stress on the cut and open the side. To apply the lateral pressure, a tool 44 as shown in FIG. 4(B) can be used. As shown in FIG. 4C, the tip 45 of the tool has a rounded shape, which allows the metal tube 4
By crushing the metal tube 3, a larger stress can be concentrated on the sides without damaging the optical fiber inside the metal tube 3. Next, the incision, which has been opened and whose strength has been reduced, is closed, and lateral pressure is applied again to apply even greater stress to the part to be opened, thereby opening the incision. By following this procedure, tools can be inserted in the longitudinal direction of the flattened metal tube in subsequent steps, and since the distance to the optical fiber is long, damage to the optical fiber is reduced. The tool 4 has a stopper 47 in this opening part, as shown in FIG.
8 to expand the opening as shown in Figure (E), the optical fiber 41 can be taken out more easily so that it can be branched midway as shown in Figure (F). .

この方法によれば、所要時間は、6分程度で十分であり
、従来の方法に比較して、3分の1程度の短かい時間で
光ファイバを取り出すことが可能であった。また、光フ
ァイバを損傷することは皆無であった。
According to this method, the required time is sufficient to be about 6 minutes, and it was possible to take out the optical fiber in about one third of the time compared to the conventional method. Furthermore, there was no damage to the optical fiber.

なお、側圧による開孔特性については、切り込みの形状
により制御でき、布設時や使用時にケーブルに加えられ
ることのある側圧よりも、やや高めに開口特性を設定し
ておくのが良い。
Note that the opening characteristics due to lateral pressure can be controlled by the shape of the cut, and it is better to set the opening characteristics slightly higher than the lateral pressure that may be applied to the cable during installation or use.

また、金属管外被、または、その上のプラスチックシー
スなとの外被に、切り込みの位置を示すマーカーなどを
記しておくと作業上非常に便利である。
It is also very convenient to write a marker indicating the position of the cut on the metal tube jacket or the plastic sheath over it.

(発明の効果) 以上の説明から明らかなように、本発明の光ファイバ心
線においては、金属管に切り込みを設けたことにより、
これを開口して光ファイバを取り出す作業がきわめて容
易となり、しかも、光ファイバに損傷を与えることのな
い効果がある。
(Effects of the Invention) As is clear from the above description, in the optical fiber core of the present invention, by providing a cut in the metal tube,
The operation of opening the opening and taking out the optical fiber becomes extremely easy, and there is an effect that the optical fiber is not damaged.

また、金属管被覆部は開孔していないため、ガスや水の
透過性は、従来と同等の性質を有している。また、引っ
張り強度についても、切り込みの断面積が十分少さいた
め、従来構造と同等である。
In addition, since the metal tube coating has no holes, its permeability to gas and water is the same as that of the prior art. Furthermore, the tensile strength is also equivalent to that of the conventional structure because the cross-sectional area of the cut is sufficiently small.

さらに下水道中のネズミ等による獣舎についても金属管
が無開孔であること、その強度が十分高いことから問題
はない。
Furthermore, there is no problem with the enclosure of rats and the like in the sewerage system, as the metal pipes have no holes and are sufficiently strong.

このため、従来の金属管被覆光ファイバ心線が用いられ
ている下水道系に限らず、高耐候性が要求される用途に
本発明の光ファイバ心線を使用することは有用である。
Therefore, it is useful to use the optical fiber core of the present invention not only in sewer systems where conventional metal tube coated optical fiber cores are used, but also in applications requiring high weather resistance.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の一実施例を説明するためのもので、
同図(A)は、光ファイバ心線をその軸方向に直角に切
断した一部の斜視図、同図(B)〜(D)は、金属管を
開く場合の説明図、第2図は、従来の金属管被覆光ファ
イバ心線の断面図、第3図は、従来の光ファイバ心線に
おける光ファイバを取り出す作業の説明図、第4図は、
本発明の実施例の光ファイバ心線における光ファイバを
取り出す作業の説明図である。 1・・・光ファイバ、2・・・金属管、3・・・切り込
み、4・・・側圧、5・・・金属疲労部。 第1図 (B)           (D) 第2図 莞3図
FIG. 1 is for explaining one embodiment of the present invention.
Figure (A) is a perspective view of a part of the optical fiber core cut at right angles to its axial direction, Figures (B) to (D) are explanatory diagrams when opening the metal tube, and Figure 2 is , a cross-sectional view of a conventional coated optical fiber coated with a metal tube, FIG. 3 is an explanatory diagram of the operation of taking out an optical fiber from a conventional coated optical fiber, and FIG.
FIG. 3 is an explanatory diagram of an operation for taking out an optical fiber from a coated optical fiber according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Optical fiber, 2... Metal tube, 3... Notch, 4... Side pressure, 5... Metal fatigue part. Figure 1 (B) (D) Figure 2 Guan 3

Claims (1)

【特許請求の範囲】[Claims] 光ファイバを金属管内に収納してなる光ファイバ心線に
おいて、前記金属管の内面に、その長さ方向に沿って、
切り込みが設けられていることを特徴とする光ファイバ
心線。
In an optical fiber core wire formed by housing an optical fiber in a metal tube, on the inner surface of the metal tube, along the length direction,
An optical fiber core wire characterized by being provided with a notch.
JP2321049A 1990-11-27 1990-11-27 Optical fiber cord Expired - Fee Related JP2957267B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2321049A JP2957267B2 (en) 1990-11-27 1990-11-27 Optical fiber cord

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2321049A JP2957267B2 (en) 1990-11-27 1990-11-27 Optical fiber cord

Publications (2)

Publication Number Publication Date
JPH04191713A true JPH04191713A (en) 1992-07-10
JP2957267B2 JP2957267B2 (en) 1999-10-04

Family

ID=18128231

Family Applications (1)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2837286A1 (en) * 2002-03-12 2003-09-19 Acome Soc Coop Travailleurs Optical cable used for telecommunication networks, has greater accessibility without need for specific tools
EP1556725A1 (en) * 2002-10-31 2005-07-27 Corning Cable Systems LLC Peelable buffer layer having a preferential tear portion and methods of manufacturing the same
WO2005096053A1 (en) * 2004-03-31 2005-10-13 Ccs Technology, Inc. Mechanically separable cable
WO2009110177A1 (en) * 2008-03-07 2009-09-11 Fujikura Ltd. Optical fiber cable and method of mid-span access thereof
WO2009154706A1 (en) * 2008-06-19 2009-12-23 Corning Cable Systems Llc Fiber optic cable having armor with easy access features

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2837286A1 (en) * 2002-03-12 2003-09-19 Acome Soc Coop Travailleurs Optical cable used for telecommunication networks, has greater accessibility without need for specific tools
EP1357413A2 (en) * 2002-03-12 2003-10-29 Acome Société Cooperative De Travailleurs Optical cable with easy access
EP1357413A3 (en) * 2002-03-12 2004-02-04 Acome Société Cooperative De Travailleurs Optical cable with easy access
EP1556725A1 (en) * 2002-10-31 2005-07-27 Corning Cable Systems LLC Peelable buffer layer having a preferential tear portion and methods of manufacturing the same
EP1556725A4 (en) * 2002-10-31 2011-02-16 Corning Cable Sys Llc Peelable buffer layer having a preferential tear portion and methods of manufacturing the same
WO2005096053A1 (en) * 2004-03-31 2005-10-13 Ccs Technology, Inc. Mechanically separable cable
WO2009110177A1 (en) * 2008-03-07 2009-09-11 Fujikura Ltd. Optical fiber cable and method of mid-span access thereof
AU2009220733B2 (en) * 2008-03-07 2011-12-01 Fujikura Ltd. Optical fiber cable and method of mid-span access thereof
US8520992B2 (en) 2008-03-07 2013-08-27 Fujikura Ltd. Optical fiber cable ready for mid-span access and method of mid-span access thereof
WO2009154706A1 (en) * 2008-06-19 2009-12-23 Corning Cable Systems Llc Fiber optic cable having armor with easy access features

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