JP2007047336A - Closure for connecting optical cable - Google Patents

Closure for connecting optical cable Download PDF

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JP2007047336A
JP2007047336A JP2005230201A JP2005230201A JP2007047336A JP 2007047336 A JP2007047336 A JP 2007047336A JP 2005230201 A JP2005230201 A JP 2005230201A JP 2005230201 A JP2005230201 A JP 2005230201A JP 2007047336 A JP2007047336 A JP 2007047336A
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cable
closure
optical cable
optical
introduction port
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JP4324139B2 (en
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Yoshihiro Takayama
喜寛 高山
Tetsuya Osugi
哲也 大杉
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Nippon Tsushin Denzai KK
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Nippon Tsushin Denzai KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a closure for connecting aerial optical cable, a closure that can achieve its cost reduction and compactness by simplifying the structure of a seal member to be fitted to a cable introducing port. <P>SOLUTION: The cable introducing port 34 formed in the closure body 36 having a cable storing section 33 is formed with an angle of depression facing downward from a level, thereby suppressing splash itself of rainwater or the like to the cable introducing port 34, and reducing a load on a seal member 41 mounted on the port 34. As a result, the structure of the seal member 41 is simplified, so that the cost reduction and the compactness is attained for the closure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、架空で光ケーブルとドロップケーブルとを接続する光ケーブル接続用クロージャに関し、特に、シール部材の構造の単純化によりクロージャのコスト低減やコンパクト化を実現するための改良に関する。   The present invention relates to an optical cable connection closure for connecting an optical cable and a drop cable in an aerial environment, and more particularly to an improvement for realizing cost reduction and compactness of the closure by simplifying the structure of a seal member.

光ケーブルを用いたネットワークの中で、加入者宅まで直接光ファイバを引き込む形態をＦＴＴＨ（Fiber To The Home）と言う。通常、加入者宅近傍には、数心〜数十心程度の光ケーブルが通信事業者のネットワークとして架設されている。
ＦＴＴＨ（Fiber To The Home）では、図４に示すように、加入者宅の近くで電柱１等により支持された架空の吊線３に吊持させた光ケーブル接続用クロージャ５内で、架空の光ケーブル７から必要心数（１〜２心／加入者宅）を引き落とし、加入者宅に引き込むドロップケーブルに接続する。 In a network using an optical cable, a form in which an optical fiber is drawn directly to a subscriber's house is called FTTH (Fiber To The Home). Usually, in the vicinity of a subscriber's house, several to several tens of optical cables are erected as a network of communication carriers.
In FTTH (Fiber To The Home), as shown in FIG. 4, an aerial optical cable 7 is installed in an optical cable connection closure 5 that is suspended on an aerial suspension line 3 supported by a utility pole 1 or the like near a subscriber's house. The necessary number of hearts (1 to 2 cores / subscriber's house) is withdrawn from and connected to a drop cable to be drawn into the subscriber's house.

図５は、このような光ケーブル接続用クロージャ５の従来例を示したものである。
図５に示した光ケーブル接続用クロージャ５は、下記特許文献１に記載されたもので、表面側を開放したケーブル収容部１１と外部からこのケーブル収容部１１に光ケーブル７及びドロップケーブル８を導入する２つのケーブル導入口１２が形成されたクロージャ本体１３と、ケーブル収容部１１の開放面を覆う蓋体１４と、クロージャ本体１３を架空の吊線３に吊持させる吊持機構１５とを備えて、架空で光ケーブル７とドロップケーブル８とを接続する。 FIG. 5 shows a conventional example of such an optical cable connection closure 5.
The optical cable connection closure 5 shown in FIG. 5 is described in Patent Document 1 below, and introduces an optical cable 7 and a drop cable 8 from the outside into a cable housing portion 11 whose surface side is opened and the cable housing portion 11 from the outside. A closure body 13 in which two cable introduction ports 12 are formed; a lid body 14 that covers the open surface of the cable housing portion 11; and a suspension mechanism 15 that suspends the closure body 13 on an imaginary suspension line 3; The optical cable 7 and the drop cable 8 are connected over the ground.

クロージャ本体１３及び蓋体１４は、樹脂製で、互いの上端縁が可撓ヒンジを介して結合することで、蓋体１４がクロージャ本体１３に対して上下方向に開閉可能になっている。また、蓋体１４には、クロージャ本体１３のケーブル収容部１１を覆う状態に閉じた時に、クロージャ本体１３側の係止突起１３ａに係合して閉じた状態を保持する弾性係止片１４ａが一体形成されている。   The closure body 13 and the lid body 14 are made of resin, and the lid body 14 can be opened and closed with respect to the closure body 13 in the vertical direction by connecting the upper end edges of the closure body 13 and the lid body 14 via a flexible hinge. The lid 14 has an elastic locking piece 14a that engages with the locking projection 13a on the closure main body 13 side and holds the closed state when the closure 14 is closed to cover the cable housing portion 11 of the closure main body 13. It is integrally formed.

上記光ケーブル接続用クロージャ５の場合、２つのケーブル導入口１２は、吊線３に吊持されたクロージャ本体１３の水平方向に対向する左右の垂直な側壁に貫通形成された開口である。２つのケーブル導入口１２の内、一方は、ケーブルの入口となり、他方はケーブルの出口となる。各ケーブル導入口１２には、図６に示したシール部材１７が装備される。   In the case of the optical cable connection closure 5, the two cable introduction ports 12 are openings formed through the left and right vertical side walls facing the horizontal direction of the closure main body 13 suspended by the suspension line 3. One of the two cable inlets 12 serves as a cable inlet, and the other serves as a cable outlet. Each cable inlet 12 is equipped with a seal member 17 shown in FIG.

シール部材１７は、ヒンジ部１８を介して一体成形された一対のシールベース１９と、各シールベース１９上に装着されたたゴム製のシール部２０とを有している。そして、シール部２０には、各ケーブル７，８の挿通位置に対応してケーブル挿通用切欠部２２と、吊線３を挿通させる吊線挿通部２３とが形成されている。シール部２０のケーブル挿通用切欠部２２は、ケーブルを挟むハの字状に第１のシールリブ２５を対向配置することによって形成されている。そして、ケーブル挿通用切欠部２２の奥には、挿通するケーブルを横断するように連続して延在する第２のシールリブ２６が立設されている。   The seal member 17 has a pair of seal bases 19 formed integrally with each other via a hinge portion 18 and a rubber seal portion 20 mounted on each seal base 19. The seal portion 20 is formed with a cable insertion notch 22 and a suspension wire insertion portion 23 through which the suspension wire 3 is inserted, corresponding to the insertion positions of the cables 7 and 8. The cable insertion notch portion 22 of the seal portion 20 is formed by disposing the first seal ribs 25 so as to face each other so as to sandwich the cable. A second seal rib 26 that extends continuously so as to cross the cable to be inserted is erected in the back of the cable insertion notch 22.

シール部２０は、第１のシールリブ２５及び第２のシールリブ２６の二つのシールリブによるシール構造を、挿通ケーブルの軸方向に離間させて、２重に形成したもので、これらの２重のシール構造により、ケーブル導入口１２を挿通する３本のケーブルと１本の吊線３とをそれぞれ液密に保持する。   The seal portion 20 is a double seal structure formed by separating two seal ribs of the first seal rib 25 and the second seal rib 26 in the axial direction of the insertion cable. Thus, the three cables inserted through the cable introduction port 12 and the one hanging wire 3 are each kept liquid-tight.

図７は、図６に示した一対のシールベース１９，シール部２０を閉じて、吊線挿通部２３及び各ケーブル挿通用切欠部２２に、光ケーブル７，ドロップケーブル８，ドロップケーブル８を保持させた状態を示している。   7, the pair of the seal base 19 and the seal portion 20 shown in FIG. 6 are closed, and the optical cable 7, the drop cable 8, and the drop cable 8 are held in the hanging wire insertion portion 23 and each cable insertion notch portion 22. Indicates the state.

特開２００３−１５３４２４号公報JP 2003-153424 A

ところで、架空で光ケーブル７とドロップケーブル８との接続を行う光ケーブル接続用クロージャ５では、雨水がケーブル導入口１２から浸入しないように、防水性を確保することが必要になる。この防水性には、ＪＩＳ Ｃ０９２０に基づいて、ＩＰＸ３，ＩＰＸ４の防水仕様が適用される。
ＩＰＸ３の防水仕様は、鉛直から両側に６０度までの角度範囲で光ケーブル接続用クロージャ５に対して水を噴霧しても水が浸入しないこと、となっている。
また、ＩＰＸ４の防水仕様は、ＩＰＸ３よりもさらに厳格で、あらゆる方向から光ケーブル接続用クロージャ５に対して水を噴霧しても水が浸入しないこと、となっている。 By the way, in the optical cable connection closure 5 that connects the optical cable 7 and the drop cable 8 in the aerial space, it is necessary to ensure waterproofness so that rainwater does not enter from the cable introduction port 12. For this waterproofness, IPX3 and IPX4 waterproof specifications are applied based on JIS C0920.
The waterproof specification of IPX3 is that water does not enter even if water is sprayed onto the optical cable connection closure 5 in an angle range of 60 degrees from the vertical to both sides.
The waterproof specification of IPX4 is more strict than IPX3, and water does not enter even if water is sprayed on the optical cable connection closure 5 from any direction.

ケーブル導入口１２が、クロージャ本体１３の水平方向に対向する左右の垂直な側壁に貫通形成された従来の光ケーブル接続用クロージャ５では、上記ＩＰＸ４の防水仕様を満足させるには、図６に示したように、シール構造を２重に形成した複雑な構造のシール部材１７を装備せざるを得ない。
このようなシール部材１７の装備のために、光ケーブル接続用クロージャ５としての製造コストが増大するという問題があった。また、シール部材１７が複雑な構造で大型化するため、クロージャ自体が大型化するという問題もあった。さらに、２重のシール構造では、直接噴き付ける水は遮断できたものの、ケーブル表面を伝って浸入する水に対して必ずしも満足できるものではなかった。 In the conventional optical cable connection closure 5 in which the cable introduction port 12 is formed through the left and right vertical side walls facing the horizontal direction of the closure body 13, in order to satisfy the waterproof specification of the IPX 4, as shown in FIG. As described above, the sealing member 17 having a complicated structure in which the sealing structure is doubled must be provided.
Due to the provision of such a seal member 17, there is a problem that the manufacturing cost of the optical cable connection closure 5 increases. Further, since the sealing member 17 is enlarged with a complicated structure, there is a problem that the closure itself is enlarged. Further, in the double seal structure, although the water sprayed directly could be blocked, it was not always satisfactory with respect to the water entering through the cable surface.

なお、上記のような架空用の光ケーブル接続用クロージャ５とは異なるが、光ファイバの接続機器として、家屋の軒下に装備されて、屋外側からケーブル収容部に引き込まれるドロップケーブルの成端部と住宅内からケーブル収容部に引き込まれるインドアケーブルの成端部とを前記ケーブル収容部内でコネクタ接続する成端キャビネットがある。そして、この成端キャビネットには、防水用のシール部材を簡略化するために、キャビネットの下面に、鉛直下方に向けてケーブル導入口を装備したものがある。しかし、このように鉛直下方に向けてケーブル導入口を開口させると、該ケーブル導入口から出入りするケーブルが下方に垂れ下がり、景観の低下を招くと同時に、架空での接続に応用した場合には、下方に垂れるケーブルが強風で煽られて、ケーブルが強風によってダメージを受けやすくなる。   Although it is different from the above-described aerial optical cable connection closure 5, an optical fiber connection device is provided under the eaves of a house, and a termination portion of a drop cable drawn into a cable housing portion from the outdoor side. There is a termination cabinet that connects a termination portion of an indoor cable drawn into a cable housing portion from within a house with a connector in the cable housing portion. And in this termination cabinet, in order to simplify the sealing member for waterproofing, there exists what equips the lower surface of a cabinet with the cable introduction port toward the perpendicular downward direction. However, when the cable inlet is opened vertically downward in this way, the cable entering and exiting from the cable inlet hangs down, causing a decrease in scenery, and at the same time, when applied to aerial connection, Cables that hang down are beaten by strong winds, making the cables more susceptible to damage by strong winds.

さらに、従来の光ケーブル接続用クロージャ５のケーブル収容部１１内では、導入された光ケーブル７から取り出した光ファイバをドロップケーブル８への接続位置まで布設する場合に、その布設経路が、光ケーブル７に内蔵されていたテンションメンバの布設経路を交差する場合があり、外部からクロージャに作用する振動等で光ファイバがテンションメンバに擦れることで、光ファイバが傷付くことがあった。そのため、光ファイバ７ｂには、図７に示すように、一般に、光ケーブル７内のテンションメンバ７ａによる損傷を防止するための、保護チューブ２７が被せられている。しかし、このような対策は、部品数の増加と手間の増大によりコスト増を招いた。   Further, in the cable housing portion 11 of the conventional optical cable connection closure 5, when the optical fiber taken out from the introduced optical cable 7 is laid to the connection position to the drop cable 8, the laying path is built in the optical cable 7. In some cases, the laying path of the tension member may cross, and the optical fiber may be rubbed against the tension member by vibration or the like acting on the closure from the outside, so that the optical fiber may be damaged. Therefore, as shown in FIG. 7, the optical fiber 7b is generally covered with a protective tube 27 for preventing damage due to the tension member 7a in the optical cable 7. However, such measures have caused an increase in cost due to an increase in the number of parts and labor.

本発明の目的は、ケーブル導入口に装備するシール部材の構造の単純化により、クロージャのコスト低減やコンパクト化を実現でき、更には、ケーブル収容部に導入された光ケーブルから取り出された光ファイバがテンションメンバとの擦れで損傷することがない架空用の光ケーブル接続用クロージャを提供することにある。   The object of the present invention is to realize a reduction in the cost and compactness of the closure by simplifying the structure of the sealing member provided in the cable introduction port. Further, the optical fiber taken out from the optical cable introduced into the cable housing portion can be realized. An object of the present invention is to provide an aerial optical cable connection closure that is not damaged by rubbing with a tension member.

上記目的を達成するために、本発明に係る請求項１記載の光ケーブル接続用クロージャは、ケーブル収容部を有し、このケーブル収容部に光ケーブル及びドロップケーブルを導入するケーブル導入口が形成されたクロージャ本体を備えて、架空で光ケーブルとドロップケーブルとを接続する光ケーブル接続用クロージャであって、前記クロージャ本体のケーブル導入口が、水平より下方に向く俯角に形成されていることを特徴とする。   To achieve the above object, an optical cable connection closure according to claim 1 of the present invention has a cable housing portion, and a cable introduction port for introducing an optical cable and a drop cable is formed in the cable housing portion. An optical cable connection closure that includes a main body and connects an optical cable and a drop cable in an aerial space, wherein the cable introduction port of the closure main body is formed at a depression angle that faces downward from the horizontal.

本発明に係る請求項２記載の光ケーブル接続用クロージャは、請求項１に記載の光ケーブル接続用クロージャにおいて、前記ケーブル導入口の角度が、３０°〜６０°の範囲内にあることを特徴とする。   An optical cable connection closure according to claim 2 according to the present invention is the optical cable connection closure according to claim 1, wherein the angle of the cable introduction port is within a range of 30 ° to 60 °. .

本発明に係る請求項３記載の光ケーブル接続用クロージャは、請求項１又は２に記載の光ケーブル接続用クロージャにおいて、前記ケーブル収容部内に導入される前記光ケーブルに内蔵の光ファイバが、前記光ケーブルに内蔵されたテンションメンバの前記ケーブル収容部内の直線的な布設経路から離脱して専用の布設経路に隔離収容されることを特徴とする。   An optical cable connection closure according to claim 3 according to the present invention is the optical cable connection closure according to claim 1 or 2, wherein an optical fiber built into the optical cable introduced into the cable housing portion is built into the optical cable. The tension member is separated from the linear laying path in the cable housing portion and is isolated and accommodated in a dedicated laying path.

本発明に係る請求項４記載の光ケーブル接続用クロージャは、請求項１〜３の何れか一つに記載の光ケーブル接続用クロージャにおいて、前記ケーブル導入口に、光ケーブル又はドロップケーブルの外周に密着する一体構造のシール部材が装着されていることを特徴とする。   An optical cable connection closure according to a fourth aspect of the present invention is the optical cable connection closure according to any one of the first to third aspects, wherein the optical cable or the drop cable is in close contact with the cable introduction port. A sealing member having a structure is mounted.

本発明の光ケーブル接続用クロージャによれば、ケーブル収容部を有したクロージャ本体に形成されるケーブル導入口が水平より下方に向く俯角に形成されたため、雨水等によるケーブル導入口への飛水自体が起こりにくくなり、ケーブル導入口に装備するシール部材への負担が低減される。これにより、シール部材に要求される耐水圧等が軽減され、例えば、一重のシール構造でもケーブル収容部内への浸水を防ぐに十分な防水性能を得ることが可能になり、シール部材の構造の単純化やコンパクト化によって、クロージャのコスト低減やコンパクト化を実現できる。   According to the optical cable connection closure of the present invention, since the cable introduction port formed in the closure main body having the cable housing portion is formed at a depression angle facing downward from the horizontal, the water itself to the cable introduction port due to rain water or the like is This is less likely to occur, and the burden on the seal member installed at the cable inlet is reduced. This reduces the water pressure resistance required for the seal member. For example, even with a single seal structure, it is possible to obtain a waterproof performance sufficient to prevent water from entering the cable housing portion, and the structure of the seal member is simple. By making it more compact and compact, it is possible to reduce the cost and size of the closure.

以下、本発明に係る光ケーブル接続用クロージャの好適な実施の形態について、図面を参照して詳細に説明する。
図１は本発明に係る光ケーブル接続用クロージャの一実施の形態なおける架設状態の概略正面図、図２は図１に示した光ケーブル接続用クロージャの蓋体を開いてクロージャ本体のケーブル収容部を開放した状態の正面図、図３（ａ）は図２に示したクロージャ本体内に積層状態で装備される余長収容カセットを開いた状態の正面図、図３（ｂ）は（ａ）のＡ−Ａ断面図である。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an optical cable connection closure according to the invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic front view of an optical cable connection closure according to an embodiment of the present invention. FIG. 2 is a plan view of the optical cable connection closure shown in FIG. Fig. 3 (a) is a front view of the opened state, Fig. 3 (a) is a front view of the closure main body cassette shown in Fig. 2 in a stacked state, and Fig. 3 (b) is a diagram of Fig. 3 (b). It is AA sectional drawing.

光ケーブル接続用クロージャ３１は、図１に示すように、電柱１等により支持された架空の吊線３に吊持して、通信事業者のネットワークの光ケーブル７と加入者宅に引き込むドロップケーブル８とを架空で接続する場合に使用される。   As shown in FIG. 1, the optical cable connection closure 31 is hung on an imaginary suspension line 3 supported by a utility pole 1 or the like, and includes an optical cable 7 of a network of a telecommunications carrier and a drop cable 8 drawn into a subscriber's house. Used when connecting fictitious.

光ケーブル接続用クロージャ３１は、図２に示すように、表面側を開放したケーブル収容部３３と外部からこのケーブル収容部３３に光ケーブル７及びドロップケーブル８を導入する一対のケーブル導入口３４が形成されたクロージャ本体３６と、ケーブル収容部３３の開放面を覆う蓋体３８と、クロージャ本体３６を架空の吊線３に吊持させる吊持機構３９と、ケーブル導入口３４に装着されてケーブル導入口３４に挿通されるケーブルとケーブル導入口３４との間を液密に封止するシール部材４１，４２とを備えている。   As shown in FIG. 2, the optical cable connection closure 31 is formed with a cable housing portion 33 whose front side is open and a pair of cable introduction ports 34 through which the optical cable 7 and the drop cable 8 are introduced into the cable housing portion 33 from the outside. The closure body 36, the lid body 38 that covers the open surface of the cable housing portion 33, the suspension mechanism 39 that suspends the closure body 36 on the imaginary suspension line 3, and the cable introduction port 34 attached to the cable introduction port 34. And sealing members 41 and 42 for liquid-tightly sealing between the cable inserted into the cable and the cable introduction port 34.

クロージャ本体３６は、背面壁３６ａとその周囲に立設した周壁３６ｂとで、表面側を開放したケーブル収容部３３を画成している。クロージャ本体３６の周壁３６ｂの内、上壁の両端角部となる部位３６ｃと、下壁の両端角部となる部位３６ｄは、いずれも、水平面に対して所定角度θ１，θ２で傾斜した傾斜壁になっている。   The closure main body 36 defines a cable housing portion 33 that is open on the surface side by a back wall 36a and a peripheral wall 36b that stands up around the back wall 36a. Of the peripheral wall 36b of the closure main body 36, a portion 36c that is both end corners of the upper wall and a portion 36d that is both end corners of the lower wall are inclined walls inclined at predetermined angles θ1 and θ2 with respect to the horizontal plane. It has become.

本実施の形態の場合、一対のケーブル導入口３４は、クロージャ本体３６の下壁両端の傾斜壁３６ｄに直交する方向に貫通形成されている。
これによって、各ケーブル導入口３４が、水平より下方に向く俯角（水平面から下にあるものを見る支線と水平面とが成す角）に形成されている。
本実施の形態の場合、各ケーブル導入口３４の俯角θ３は３０°〜６０°の範囲内に設定される。なお、図２において、俯角θ３＝（９０°−θ２）であるから、上記俯角が得られるように、傾斜壁３６ｄの傾斜角θが設定される。 In the case of the present embodiment, the pair of cable introduction ports 34 are formed so as to penetrate in a direction perpendicular to the inclined walls 36 d at both ends of the lower wall of the closure body 36.
Thus, each cable introduction port 34 is formed at a depression angle (an angle formed by a branch line and a horizontal plane to see what is below the horizontal plane) that is directed downward from the horizontal.
In the case of the present embodiment, the depression angle θ3 of each cable introduction port 34 is set within a range of 30 ° to 60 °. In FIG. 2, since the depression angle θ3 = (90 ° −θ2), the inclination angle θ of the inclined wall 36d is set so that the depression angle is obtained.

ケーブル収容部３３内には、図３（ａ）に示すように、導入されたケーブルを固定するクランプ部４４，４５と、導入された光ケーブル７に内蔵のテンションメンバ７ａを固定するテンションメンバクランプ部４７と、光ケーブル７に内蔵の光ファイバ７ｂを隔離収容する専用の布設経路４８と、光ファイバ７ｂの余長を所定の曲率半径のループ状に収容する複数枚の余長収容カセット４９とが装備されている。   As shown in FIG. 3A, the cable housing portion 33 includes clamp portions 44 and 45 for fixing the introduced cable, and a tension member clamp portion for fixing the built-in tension member 7a to the introduced optical cable 7. 47, a dedicated laying path 48 for isolating and accommodating the optical fiber 7b built in the optical cable 7, and a plurality of extra length accommodation cassettes 49 for accommodating the extra length of the optical fiber 7b in a loop shape with a predetermined radius of curvature. Has been.

クランプ部４４，４５は、ねじ止めにより背面壁３６ａに固定されるもので、各ケーブル導入口３４に近接する位置に装備されている。
テンションメンバクランプ部４７は、背面壁３６ａにねじ止めされる板材で、テンションメンバ７ａを挟持固定するもので、クランプ部４４で固定した光ケーブル７から引き出されたテンションメンバ７ａを直線状態に緊張した状態に固定する。 The clamp portions 44 and 45 are fixed to the back wall 36a by screwing, and are provided at positions close to the cable introduction ports 34.
The tension member clamp portion 47 is a plate member screwed to the back wall 36a and clamps and fixes the tension member 7a. The tension member 7a pulled out from the optical cable 7 fixed by the clamp portion 44 is tensioned in a straight state. To fix.

布設経路４８は、クロージャ本体３６の背面壁３６ａから立設したリブ３６ｅ，３６ｆによって区画される布線スペースで、周壁３６ｂの内周に沿って、ケーブル収容部３３の上部に形成されている。
この布設経路４８は、図３（ａ）に示すように、光ケーブル７に内蔵の光ファイバ７ｂを、ケーブル収容部３３内におけるテンションメンバ７ａの直線的な布設経路から離脱させて隔離収容する。 The laying path 48 is a wiring space defined by ribs 36e and 36f erected from the back wall 36a of the closure main body 36, and is formed in the upper part of the cable housing portion 33 along the inner periphery of the peripheral wall 36b.
As shown in FIG. 3A, the laying path 48 separates and accommodates the optical fiber 7 b built in the optical cable 7 by separating it from the straight laying path of the tension member 7 a in the cable housing portion 33.

余長収容カセット４９は、クロージャ本体３６の背面壁３６ａに開閉可能にヒンジ結合された板材４９ａの一面に、所定半径のループ状に光ファイバ７ｂを周回させる係止フック４９ｂを装備したものである。
複数枚の余長収容カセット４９は、積層状態に装備されていて、ケーブル収容部３３から開くことで、収容した光ファイバ７ｂの所定のループ７ｒにアクセス可能になる。余長収容カセット４９は、閉じた状態にすると、図２に示すように、ケーブル収容部３３内に収まって、光ファイバ７ｂを覆う。 The surplus length accommodating cassette 49 is provided with a locking hook 49b that circulates the optical fiber 7b in a loop shape with a predetermined radius on one surface of a plate member 49a hinged to the back wall 36a of the closure body 36 so as to be opened and closed. .
The plurality of extra length accommodation cassettes 49 are mounted in a stacked state, and can be accessed from the predetermined loop 7r of the accommodated optical fiber 7b by opening from the cable accommodation portion 33. When the extra length accommodation cassette 49 is in a closed state, it is accommodated in the cable accommodation portion 33 and covers the optical fiber 7b, as shown in FIG.

一方のケーブル導入口３４に装備されるシール部材４１は、図３（ｂ）に示すように、傾斜壁３６ｄに一体形成された略筒状のケーブル導入口３４に嵌合する筒状構造で、外周には、ケーブル導入口３４の内周面に形成されたリング状のシール溝３４ａ，３４ｂに密着嵌合する環状突起４１ａ，４１ｂが装備されている。また、シール部材４１の内周には、ケーブルの外周面に密着接触する二つの環状突起４１ｃ，４１ｄが装備されている。
シール部材４１は、筒体の内外に環状突起４１ａ，４１ｂ，４１ｃ，４１ｄを装備したもので、図６及び図７に示した従来のシール部材１７と比較すると、極めて単純でコンパクトな構造である。
そして、本実施の形態の場合、シール部材４１は、硬度約３０度のゴム材により形成されている。 As shown in FIG. 3B, the seal member 41 provided in one cable inlet 34 has a cylindrical structure that fits into a substantially cylindrical cable inlet 34 formed integrally with the inclined wall 36d. On the outer periphery, annular protrusions 41 a and 41 b are provided that are closely fitted in ring-shaped seal grooves 34 a and 34 b formed on the inner peripheral surface of the cable introduction port 34. In addition, two annular protrusions 41 c and 41 d that are in close contact with the outer peripheral surface of the cable are provided on the inner periphery of the seal member 41.
The seal member 41 is provided with annular projections 41a, 41b, 41c, and 41d inside and outside the cylinder, and has a very simple and compact structure as compared with the conventional seal member 17 shown in FIGS. .
In the case of the present embodiment, the seal member 41 is formed of a rubber material having a hardness of about 30 degrees.

他方のケーブル導入口３４に装備されるシール部材４２は、挿通するドロップケーブル８とケーブル導入口３４との間を液密にするもので、挿通するケーブルの外径や、挿通本数がシール部材４１の場合と異なっているが、基本的な構成は同様で良く、シール部材４１の場合と同様に、硬度約３０度のゴム材により形成される。   The seal member 42 provided in the other cable introduction port 34 makes the space between the drop cable 8 to be inserted and the cable introduction port 34 liquid-tight, and the outer diameter and the number of insertions of the inserted cable are the seal members 41. However, the basic configuration may be the same, and the seal member 41 is formed of a rubber material having a hardness of about 30 degrees.

蓋体３８は、図２に示したように、クロージャ本体３６の一側の周壁３６ｂの外面に一体形成されて可撓ヒンジ５１によって、クロージャ本体３６に開閉可能に連結されている。
蓋体３８は、クロージャ本体３６の開放面を覆う正面壁３８ａの周囲に、シール溝３８ｂを形成する一対の周壁３８ｃ，３８ｄが立設されている。そして、シール溝３８ｂには、蓋体３８を閉じた状態にしたときにクロージャ本体３６の周壁３６ｂに密着してクロージャ本体３６と蓋体３８との間の隙間をシールするパッキンが装着される。
また、蓋体３８の可撓ヒンジ５１が装備された側とは逆側の外周部には、閉じたときにクロージャ本体３６側の係止手段に係合して閉じた状態を維持する弾性ロック片５３が一体形成されている。 As shown in FIG. 2, the lid 38 is integrally formed on the outer surface of the peripheral wall 36 b on one side of the closure body 36 and is connected to the closure body 36 by a flexible hinge 51 so as to be opened and closed.
In the lid body 38, a pair of peripheral walls 38 c and 38 d that form a seal groove 38 b are provided upright around a front wall 38 a that covers the open surface of the closure body 36. The seal groove 38b is fitted with a packing that is in close contact with the peripheral wall 36b of the closure main body 36 when the lid 38 is closed, and seals the gap between the closure main body 36 and the lid 38.
An elastic lock is provided on the outer periphery of the lid 38 opposite to the side on which the flexible hinge 51 is provided, and engages with the locking means on the closure body 36 side when the lid 38 is closed to maintain the closed state. The piece 53 is integrally formed.

以上に説明した光ケーブル接続用クロージャ３１では、ケーブル収容部３３を有したクロージャ本体３６に形成されるケーブル導入口３４が水平より下方に向く俯角に形成されたため、雨水等によるケーブル導入口３４への飛水自体が起こりにくくなり、ケーブル導入口３４に装備するシール部材４１への負担を低減させる。
これにより、シール部材４１に要求される耐水圧等が軽減され、例えば、一重のシール構造でもケーブル収容部３３内への浸水を防ぐに十分な防水性能を得ることが可能になり、シール部材４１の構造の単純化やコンパクト化によって、クロージャ３１の製造コスト低減やコンパクト化を実現できる。 In the optical cable connection closure 31 described above, the cable introduction port 34 formed in the closure main body 36 having the cable housing portion 33 is formed at a depression angle facing downward from the horizontal. Flying water itself is less likely to occur, reducing the burden on the seal member 41 installed in the cable introduction port 34.
As a result, the water pressure resistance required for the seal member 41 is reduced. For example, even with a single seal structure, it is possible to obtain a waterproof performance sufficient to prevent water intrusion into the cable housing portion 33. The manufacturing cost of the closure 31 can be reduced and the size of the closure 31 can be reduced by simplifying and downsizing the structure.

また、本実施の形態の光ケーブル接続用クロージャ３１では、ケーブル導入口３４に出入りするケーブル７，８は、図１に示したように、水平面に対して３０°〜６０°の範囲で傾斜した状態でクロージャから引き出されて、僅かな撓みＱを付けて、水平に架設されている他のケーブルに束ねられる。そのため、ケーブル導入口を鉛直方向に向けた従来の成端キャビティネットなどの場合と比較すると、クロージャ３１に出入りするケーブル７，８が下方に垂れる度合いが小さく、架空に装備されたクロージャ周辺の景観を向上させることができると同時に、出入りするケーブル７，８が強風によって煽られにくくなり、強風によってケーブル７，８がダメージを受けることを防止できる。   Further, in the optical cable connection closure 31 of the present embodiment, the cables 7 and 8 entering and exiting the cable introduction port 34 are inclined in a range of 30 ° to 60 ° with respect to the horizontal plane as shown in FIG. Then, it is pulled out from the closure, attached with a slight deflection Q, and bundled with other cables installed horizontally. Therefore, compared with the case of a conventional termination cavity net or the like with the cable introduction port oriented in the vertical direction, the cables 7 and 8 entering and exiting the closure 31 are less likely to hang downward, and the scenery around the closure equipped in the aerial In addition, the cables 7 and 8 that enter and exit are less likely to be beaten by the strong wind, and the cables 7 and 8 can be prevented from being damaged by the strong wind.

また本実施の形態の光ケーブル接続用クロージャ３１では、ケーブル収容部３３内に導入された光ケーブル７からケーブル収容部３３内に取り出された光ファイバ７ｂは、図３に示したように、テンションメンバ７ａから離脱した専用の布設経路４８で布設されるため、光ファイバ７ｂが交差するテンションメンバ７ａに擦れるような事態が発生せず、よつて、ケーブル収容部３３内に収容された光ファイバ７ｂがテンションメンバ７ａとの擦れで損傷することがなく、信頼性の高い光ファイバ接続を実現できる。   Further, in the optical cable connection closure 31 of the present embodiment, the optical fiber 7b taken out from the optical cable 7 introduced into the cable housing portion 33 into the cable housing portion 33 is, as shown in FIG. 3, the tension member 7a. Therefore, the optical fiber 7b does not rub against the intersecting tension member 7a, so that the optical fiber 7b accommodated in the cable accommodating portion 33 is tensioned. A highly reliable optical fiber connection can be realized without being damaged by rubbing with the member 7a.

さらに、本実施の形態の光ケーブル接続用クロージャ３１では、シール部材４１に採用したゴム材は、硬度を約３０°に設定したことで、挿通するケーブル外周面に対して適度な柔軟性で変形して、ケーブル外周面に対する密着性が向上するため、単純なシール構造でも、安定した高い防水性を得ることが可能になる。   Furthermore, in the optical cable connection closure 31 of the present embodiment, the rubber material employed for the seal member 41 is deformed with an appropriate flexibility with respect to the outer peripheral surface of the inserted cable by setting the hardness to about 30 °. Thus, since the adhesion to the outer peripheral surface of the cable is improved, a stable and high waterproof property can be obtained even with a simple seal structure.

本発明に係る光ケーブル接続用クロージャの一実施の形態における架設状態の概略正面図である。It is a schematic front view of the installation state in one Embodiment of the optical cable connection closure which concerns on this invention. 図１に示した光ケーブル接続用クロージャの蓋体を開いて状態の正面図である。It is a front view of the state which opened the cover body of the closure for optical cable connection shown in FIG. （ａ）は図２に示したクロージャ本体内に積層状態で装備される余長収容カセットを開いた状態の正面図、（ｂ）は（ａ）のＡ−Ａ断面図である。(A) is a front view of the state which opened the surplus length accommodation cassette equipped with the lamination | stacking state in the closure main body shown in FIG. 2, (b) is AA sectional drawing of (a). 従来の光ケーブル接続用クロージャの架設状態の概略正面図である。It is a schematic front view of the construction state of the conventional optical cable connection closure. 図４に示した光ケーブル接続用クロージャの蓋体を開いた状態の正面図である。It is a front view of the state which opened the cover body of the optical cable connection closure shown in FIG. 図５のクロージャ本体に装備されたシール部材の構造を示す斜視図である。It is a perspective view which shows the structure of the sealing member with which the closure main body of FIG. 5 was equipped. 図６のシール部材のケーブル挿通状態の斜視図である。It is a perspective view of the cable insertion state of the seal member of FIG.

符号の説明Explanation of symbols

１ 電柱
３ 吊線
７ 光ケーブル
８ ドロップケーブル
３１ 光ケーブル接続用クロージャ
３３ ケーブル収容部
３４ ケーブル導入口
３４ａ，３４ｂ リング状のシール溝
３６ クロージャ本体
３８ 蓋体
３９ 吊持機構
４１，４２ シール部材
４１ａ，４１ｂ，４１ｃ，４１ｄ 環状突起
４４，４５ クランプ部
４７ テンションメンバクランプ部
４８ 布設経路
４９ 余長収容カセット
４９ａ 板材
４９ｂ 係止フック
５１ 可撓ヒンジ
５３ 弾性ロック片 DESCRIPTION OF SYMBOLS 1 Telephone pole 3 Suspension line 7 Optical cable 8 Drop cable 31 Optical cable connection closure 33 Cable accommodating part 34 Cable inlet 34a, 34b Ring-shaped seal groove 36 Closure body 38 Cover body 39 Suspension mechanism 41, 42 Seal member 41a, 41b, 41c , 41d annular projection 44, 45 clamp part 47 tension member clamp part 48 laying path 49 extra length accommodation cassette 49a plate material 49b locking hook 51 flexible hinge 53 elastic lock piece

Claims (4)

ケーブル収容部を有し、このケーブル収容部に光ケーブル及びドロップケーブルを導入するケーブル導入口が形成されたクロージャ本体を備えて、架空で光ケーブルとドロップケーブルとを接続する光ケーブル接続用クロージャであって、
前記クロージャ本体のケーブル導入口が、水平より下方に向く俯角に形成されていることを特徴とする光ケーブル接続用クロージャ。 An optical cable connection closure that has a cable housing portion and includes a closure body formed with a cable introduction port for introducing an optical cable and a drop cable into the cable housing portion, and connects the optical cable and the drop cable in an aerial environment,
A closure for connecting an optical cable, wherein the cable introduction port of the closure body is formed at a depression angle facing downward from the horizontal. 前記ケーブル導入口の角度が、３０°〜６０°の範囲内にあることを特徴とする請求項１に記載の光ケーブル接続用クロージャ。   The optical cable connection closure according to claim 1, wherein an angle of the cable introduction port is in a range of 30 ° to 60 °. 前記ケーブル収容部内に導入される前記光ケーブルに内蔵の光ファイバが、前記光ケーブルに内蔵されたテンションメンバの前記ケーブル収容部内の直線的な布設経路から離脱して専用の布設経路に隔離収容されることを特徴とする請求項１又は２に記載の光ケーブル接続用クロージャ。   The optical fiber built in the optical cable introduced into the cable housing part is separated from the straight laying path in the cable housing part of the tension member built in the optical cable and is separately housed in the dedicated laying path. The optical cable connection closure according to claim 1 or 2. 前記ケーブル導入口に、光ケーブル又はドロップケーブルの外周に密着する一体構造のシール部材が装着されていることを特徴とする請求項１〜３のいずれか１項に記載の光ケーブル接続用クロージャ。   The optical cable connection closure according to any one of claims 1 to 3, wherein a seal member having an integral structure that is in close contact with an outer periphery of the optical cable or the drop cable is attached to the cable introduction port.
JP2005230201A 2005-08-09 2005-08-09 Optical cable connection closure Expired - Fee Related JP4324139B2 (en)

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