JPH0915430A - Connecting terminal box for optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting terminal box suitable for housing optical fiber core wirings branched from a wiring cable by an intermediate post- branching in the middles of cable wiring sections and their connecting parts. SOLUTION: This box is provided with a terminal box main body 2, a branching part 4 branching optical fiber core wirings 3 of not less than one wiring line from the bundle of optical fiber core wirings 3 led out from an optical cable 1 and a tray housing part 8 in which many connection part housing trays 7 in whose inside optical connection parts 5 and connecting excessive lengths of the optical connection parts 5 are housed are housed by being made to be laminated states in the center part along the longitudinal direction of the optical fiber cable 1 and in the connection part housing tray 7, a tray main body 22 hosing the connecting excessive length and an optical connection part housing part 23 having a length protruding to the outside of the tray main body 22, being formed so as to be capable of housing the optical connection part 5 in the arbitrary position of the longitudinal direction and being arranged along the longitudinal direction of the optical fiber cable 1 in the terminal box main body 2 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable connection terminal box for branching and connecting optical fiber cables to each other through an optical connector or an optical connecting portion composed of a fusion splicing portion in an optical fiber network.

[0002]

2. Description of the Related Art In an optical fiber network, in order to branch and connect an optical fiber cable to an optical fiber core through an optical connector or a fusion splicing part, a large number of optical connectors are installed at the branch part. A connection terminal box for an optical fiber cable that accommodates the fusion splicing portion and the extra connection length is used.

[0003]

By the way, as a connection terminal box for an optical fiber cable, an appropriate optical fiber core wire branched from a wiring cable by an intermediate post-branch in the middle of a cable wiring section and a connection portion thereof are suitable. There was nothing, and its development was desired. That is, the conventional connection terminal box for optical fiber cables does not consider the space for extracting the drop-out core wire due to the intermediate branch, and the target optical fiber without affecting the optical fiber core wire that is not the target of extraction. There was no structural consideration for removing the core wire. For this reason, as the connection terminal box used when the optical fiber cable is branched in the middle, a large-sized one capable of taking out the optical fiber core wire must be used. Further, when connecting the optical connecting portion with a particularly short extra length, the optical connecting portion cannot be stored, so it is necessary to separately provide storage means,
There is also a problem that it causes a large-sized connection terminal box and lacks versatility in connection surplus length.

The present invention has been made in view of the above-mentioned problems, and it is possible to accommodate the optical fiber core wire branched from the wiring cable and the connecting portion thereof by the intermediate post-branch in the middle of the cable wiring section. To provide an optical fiber cable connection terminal box capable of efficiently accommodating an optical connection part of an optical fiber core wire derived from an optical fiber cable with a length longer than a standard that can be optically connected and a connection extra length thereof. It is intended.

[0005]

According to another aspect of the present invention, there is provided a terminal box body for connecting an optical fiber cable, wherein a terminal box body and one bundle of optical fiber cores led from the optical fiber cable are provided inside the terminal box body. In the stacked state, a branch portion for branching the optical fiber core wire and a connection portion storage tray for storing the optical connection portion and the extra connection length of the optical connection portion inside are provided in a central portion along the longitudinal direction of the optical fiber cable. And a tray storage portion for storing a large number as the connection portion storage tray,
A tray main body for accommodating the extra connection length, and a length projecting to the outside of the tray main body. The optical fiber is formed in the terminal box main body so as to accommodate the optical connection portion at any position in the longitudinal direction. An optical connection part accommodating part arranged along the longitudinal direction of the cable is provided as a means for solving the above problems.

According to another aspect of the present invention, there is provided a connection terminal box for an optical fiber cable, wherein a terminal box main body and a bundle of optical fiber core wires led out from the optical fiber cable are provided inside the terminal box main body.
A plurality of branching parts for branching the optical fiber core wires and a plurality of optical connecting part storage tools that are provided in a row along the longitudinal direction of the optical fiber cable and house the optical connecting part inside, and in the longitudinal direction of the optical fiber cable. The above-mentioned problem was solved by including an extra length storage portion that extends along the optical connection portion storage device and stores the connection extra length of each optical connection portion stored in the optical connection portion storage tool.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of an optical fiber cable connection terminal box of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the connection terminal box for an optical fiber cable according to the present embodiment has an optical fiber cable 1 and an outdoor cable O (another optical fiber cable) branched and dropped from the optical fiber cable 1.
It is installed at the branch connection part of. This optical fiber cable connection terminal box includes a terminal box body 2 fixedly installed at a predetermined position of the optical fiber cable 1, and an optical fiber core wire 3 led out from the optical fiber cable 1 inside the terminal box body 2. A branch portion 4 that branches one or more optical fiber core wires 3 from the bundle, an optical connection portion 5 that connects the optical fiber core wires 3 that are branched from the optical fiber cable 1 at the branch portion 4, and a connection extra length. The tray storage section 8 for storing a plurality of connection section storage trays 7 for storing 6 inside in a stacked state is provided.

As shown in FIGS. 1 to 4, the terminal box body 2 is a lightweight, elongated rectangular parallelepiped casing made of plastic or the like, and its longitudinal direction extends along the laying direction of the optical fiber cable 1. It is arranged alongside. Both ends in the longitudinal direction of the terminal box body 2 are closed by end face plates 9. An insertion port 10 for inserting the optical fiber cable 1 is opened in the end face plate 9. This insertion port 10
It is formed near the top plate 11 of the terminal box body 2. The end face plate 9 is formed by connecting two plate members 9 a and 9 a with a fixing metal fitting 12. A gripping tool 13 for gripping and fixing the optical fiber cable 1 introduced into the insertion port 10 to the end face plate 9 is provided near the insertion port 10 outside the end face plate 9 (see FIG. 3). The gripping tool 13 has a split shape that can be opened and closed by a screw 14 so that the optical fiber cable 1 is fixed to the end face plate 9 by the demon eye 1a (see FIG. 1) formed on the inner surface side. Has become.

The inside of the insertion port 10 of the terminal box body 2 is the branch portion 4. The branch portion 4 is an area for leading the optical fiber core wire 3 from the optical fiber cable 1.

As shown in FIGS. 1 and 4, a connector 16 for connecting the top plate 11 and the bottom plate 15 of the terminal box body 2 is provided near the inner surface of the end plate 9 of the terminal box body 2. Has been. The connecting tool 16 is screwed to the end face plate 9 at a lower fixing portion 17 provided at the lower portion. Further, a fixing rod 18 for fixing the terminal box body 2 to the support line P drawn through the optical fiber cable 1 is provided between the upper ends of the connecting tools 16 at both ends in the longitudinal direction of the terminal box body 2. ing. The fixing rod 18 is provided on the top plate 11
Are arranged along the inner surface of the. At both ends of the fixed rod 18, support wire clamp tools 19 led out from the optical fiber cable 1 are provided. Further, a plurality of bundling tools 20 for bundling and fixing the bundle of the optical fiber core wires 3 derived from the optical fiber cable 1 and the support wires P are provided at appropriate positions in the central portion of the fixing rod 18 in the longitudinal direction. There is. A bundle of optical fiber core wires 3 and a central portion of the support wire P,
The focusing tool 20 is provided inside the case C. The case C has a configuration having an openable and closable upper lid, and the optical fiber core wire 3 inside can be freely taken out and stored. The connector 16 is
The upper fixing portion 21 provided on the upper portion is also screwed to the end face plate 9.

The central portion of the lower portion of the terminal box body 2 is the tray housing portion 8. The tray storage portion 8 includes a pair of tray support plates 8a which are arranged on the upper surface of the bottom plate 15 so as to be spaced apart from each other in the longitudinal direction of the optical fiber cable 1 and face each other, and in which a plurality of connection portion storage trays 7 are aligned and stored. It is the area between. The tray housing 8 has the tray support plate 8a.
In between, the plurality of connection part storage trays 7 are respectively erected vertically to the bottom plate 15 and stored in close contact with each other. As shown in FIGS. 1 and 6, the connection part storage tray 7 is entirely formed of a material having elasticity to some extent, such as plastic, and the tray main body for storing the extra connection length 6 of the optical connection part 5. 22 and a length projecting to the outside of the tray main body 22 so as to support the optical connecting portion 5 at any position in the longitudinal direction thereof, and in the terminal box main body 2 in the longitudinal direction of the optical fiber cable 1. And a first connection portion storage portion 23 (optical connection portion storage portion) arranged along the line.

The tray body 22 is a flat rectangular box body. The first connection portion storage portion 23 is provided on the outer side of one long side of the tray body 22, and has both ends formed in a rod shape protruding toward both ends of the long side of the tray body 22. As shown in FIG. 5, inside the first connection portion storage portion 23, the optical connection portions 5 extend in parallel with each other along the longitudinal direction and accommodate the optical connection portions 5 at arbitrary positions in the longitudinal direction.
A storage rack 24 is formed. An openable lid 24 a is provided on one side surface of the storage rack 24. The tray body 22 also has an opening / closing wall 22a whose one side wall is openable / closable, so that the extra connection length 6 can be stored / removed freely. The lid 24a and the opening / closing wall 2
The reference numeral 2a is a lock claw (not shown),
It is adapted to be openably and closably locked at the boundary between the tray 3 and the tray body 22. Inside each storage shelf 24,
A grip wall 24b for gripping the optical connection part 5 is provided in a protruding manner.

In the case where the optical fiber core wire 3 led out from the optical fiber cable 1 is a tape core wire, a tape-shaped extension core wire 3j is connected via the optical connecting portion 5, and the extension core wire 3j is provided in the middle thereof. The multi-core single-core branch section 5a is provided to convert to a single core, and the multi-core single-core branch section 5a is also housed in the first connection section housing section 23. A fusion splicing part, an optical connector, or the like is applied as the optical connecting part 5.
Further, although the first connection portion storage portion 23 has a rod shape in the present embodiment, it may have another shape such as a band shape as long as it can extend in the longitudinal direction of the terminal box body 2. It may be.

The tray main body 22 is drawn into the terminal box main body 2 through the outdoor wire supporting members 25 provided on the bottom plate 15 of the terminal box main body 2 in the vicinity of the first connecting portion accommodating portion 23 on both sides. Optical fiber core wire Oj derived from the outdoor cable O
And a second connector housing portion 26 for housing the optical connector 5 for optically connecting the extension core wire 3j branched from the optical fiber core wire 3 into a single core. Inside the tray main body 22, there is provided a ring-shaped radius maintaining portion 27 that maintains the bending radius of the extension core wire 3j of the optical fiber core wire 3 when the extra connection length 6 is wound. When the connection surplus length 6 derived from the optical fiber cable 1 of the optical fiber core wire 3 by a length longer than the standard for optical connection is short, the optical fiber core wire O of the outdoor wire cable O is placed inside the tray body 22.
The connection extra length of j may be stored.

The outdoor wire supporting member 25 is a substantially convex supporting plate 28 which is provided on the lower surface of the bottom plate 15 of the terminal box body 2 to support a supporting wire (not shown) of the outdoor wire cable O, and a bottom plate. On the inner surface side of 15, a gripper 29 is provided corresponding to the support plate 28 and grips the outdoor cable O itself. Inside the terminal box body 2 of the outdoor wire support 25, the optical fiber core wire Oj is led out from the outdoor wire cable O. In addition, the outdoor line support 25
The inside of the terminal box body 2 is located below the tip of the first connection part housing 23, and a sufficient space for leading out the optical fiber core wire Oj can be secured.

When the optical fiber core wire 3 is a single core and has a sufficient lead length, the optical fiber core wire 3 is not directly connected to the extension core wire 3j but is directly connected to the outdoor cable O through the optical connecting portion 5. You may connect with the optical fiber core line Oj. As shown in FIG. 7, both side plates 30 of the terminal box body 2 are rotatably supported by thin-walled portions 31 (see FIGS. 1 and 2) provided between the both ends of the top plate 11 in the width direction. There is. Further, a plurality of lock portions 31a capable of holding the side plate 30 in the closed state are provided at both ends in the width direction of the bottom plate 15.

In order to mount the optical fiber cable connection terminal box on the optical fiber cable 1, first, at the mounting position of the terminal box body 2 of the optical fiber cable 1, the outer cover 32 of the optical fiber cable 1 is cut and cut into the optical fiber core wire. The exposed portion 33 exposing the bundle of 3 is formed, and the insertion port 10 of the both end face plates 9 is formed in the outer skin 32 adjacent to both ends of the exposed portion 33.
Fit through 2. Next, the gripping tool 13 is attached to the outer skin 32 in the vicinity of the attachment position of the end face plate 9 to integrate the optical fiber cable 1 and the end face plate 9. Next, the fixed rod 18 is fixed to the support wire P led out from the optical fiber cable 1, and the terminal box body 2 is assembled based on the both end surface plates 9 and the fixed rod 18. At this time, by assembling the top plate 11 of the terminal box body 2 and the side plates 30 as a unit, the assembled unit can be exposed at the exposed portion 33 of the optical fiber cable 1 by simply opening the side plate 30 on one side. Both end plates 9
Etc. can be easily decorated.

When the assembly of the terminal box main body 2 is completed, the optical fiber core wire 3 for connecting to the outdoor cable O is branched from the bundle of the optical fiber core wires 3 at the branching portion 4 with a length equal to or longer than the standard for optical connection. . When the branched optical fiber core wire 3 is a tape core wire, first, it is connected to the tape-shaped extension core wire 3j through the optical connection portion 5, and the extension core wire 3j is branched along the way to a multicore single-core branch. A part 5a is provided to branch a single fiber. On the other hand, the outdoor wire cable O is fixed to the outdoor wire support 25, and the optical fiber core wire Oj is led out from the end portion thereof and optically connected to the extension core wire 3j through the optical connecting portion 5.

When this optical connection is completed, the optical fiber core wire 3 led out from the optical fiber cable 1 and the extension core wire 3j
The optical connection part 5 for connecting the optical fiber and the multi-core single-core branch part 5a are stored in the first connection part storage part 23, and the optical fiber connecting the optical fiber core Oj from the outdoor cable O and the extension core 3j. The connection part 5 is stored in the second connection part storage part 26, and the extra connection length 6 is stored in the tray body 22. When the storage of the optical connection part 5 and the extra connection length 6 in the connection part storage tray 7 is completed, the connection part storage tray 7 starts from the part where the side plate 30 is opened.
Is inserted into the terminal box body 2. At this time, when the extra connection length 6 of the optical fiber core wire 3 is short, the optical connection is made to a location near the position where the longitudinal optical fiber core wire 3 of the first connection part housing portion 23 is led out from the optical fiber cable 1. Store part 5.

When the branched optical fiber core wire 3 has a single core and can secure a sufficient lead-out length, it is directly connected to the optical fiber core wire Oj of the outdoor cable O via the optical connecting portion 5, and the optical fiber The connection part 5 is connected to the first and second connection part storage parts 23,
Store in one of 26. Further, when the lead-out length of the optical fiber core wire 3 is insufficient, one end of the extension core wire 3j is connected to the optical fiber core wire 3 via the optical connection part 5 to connect the optical connection part 5 to the first optical connection part 5. The optical fiber core Oj of the outdoor cable O is also accommodated in the connection housing 23 and another optical connection 5
The other end of the extension core wire 3j is connected to the optical connection part 5 in the second connection part storage part 26.

Therefore, according to the optical fiber cable connection terminal box of the present embodiment, the first connection portion capable of accommodating the optical connection portion 5 at an arbitrary position along the longitudinal direction of the optical fiber cable 1. Since it has a storage section 23,
Even if there is a difference in the connection extra length 6 of the optical fiber core wire 3 derived from the optical fiber cable 1 with a length longer than the standard for optical connection, the connection extra length 6 of the optical fiber core wire 3 The optical connection part 5 can be stably stored in the first connection part storage part 23 according to the length of the. Further, the optical connection part 5 and the optical fiber core wire 3 connected by the optical connection part 5 and the extra connection length 6 of the optical fiber core wire Oj of the outdoor cable O are arranged and stored in the same connection part storage tray 7. can do. As a result, a large number of optical connection parts 5 and extra connection lengths 6 can be stored in the terminal box body 2 without confusion and at a high density, and the optical connection parts 5 can be pulled out or re-used at the time of switching the connection. The storage work can be performed efficiently. As a result, even if the connection extra length 6 of the optical fiber core wire 3 is short, the optical connection part 5 can be stored in the connection part storage tray 7, and the optical connection for the extra short length is specially provided in the terminal box body 2. Since it is not necessary to provide a storage portion for the portion 5, the terminal box body 2 can be downsized.

A second embodiment of the optical fiber cable connection terminal box of the present invention will be described below with reference to FIGS. The optical fiber cable connection terminal box according to the present embodiment is provided with a plurality of connection terminals along the longitudinal direction of the optical fiber cable 1 inside the terminal box main body 2 described in the first embodiment, instead of the tray storage section 8. An optical connection part storage tool 34 that is installed and can store the optical connection part 5 therein, and the optical fiber cable 1
And a surplus length storage portion 35 that stores the connection surplus length 6 of each optical connection portion 5 stored in the optical connection portion storage tool 34. In the figure, the same components as those in FIGS. 1 to 7 are designated by the same reference numerals to simplify the description.

The optical connector housing 34 is shown in FIGS.
As shown in FIG. 7, below the optical fiber cable 1 (lower side in FIG. 7), along the optical fiber cable 1 and on the storage tool support plate 36 arranged and fixed in parallel with the top plate 11 of the terminal box body 2. , The terminal box body 2 is displaced from each other in the width direction. A through hole 36 a for arranging the optical fiber core wire 3 above and below the storage tool support plate 36 is opened in the storage tool support plate 36 near the optical connector storage tool 34. The optical connector housing 34 has an elongated case-like shape that has an openable / closable lid (not shown) on its side and can store the optical connector 5 inside. It is fixed in parallel with the axis of the fiber cable 1. In the present embodiment, the optical connection part storage tool 34 stores the optical connection part 5 that directly connects the optical fiber core wire 3 to the outdoor wire core wire Oj derived from the outdoor wire cable O.

A strip-shaped extra length accommodating plate 37 for accommodating the extra connection length 6 while maintaining an appropriate bending radius is provided in the central portion in the width direction of the extra length accommodating portion 35 along the vertical direction of the terminal box body 2. It is installed. As shown in FIG. 7, the extra length storage plate 37 is made of a lightweight resin such as plastic and is used for the terminal box body 2
Is formed in a rectangular plate shape having a length of about 3/4 of the longitudinal direction, and on both surfaces thereof, as shown in FIGS. 10 and 11,
A plurality of radius maintaining members 38 that maintain the bending radius of the extra connection length 6 are provided in a protruding manner. The extra length storage plate 37 is provided close to the end face plate 9 on one side of the terminal box body 2. The radius maintaining member 38 is continuously provided along the longitudinal direction of the extra length accommodating plate 37 and substantially corresponds to the optical connector accommodating tool 34. In addition,
A ring-shaped winding tool 35a for storing the extra length of the outdoor wire core Oj by curving the extra length with a radius larger than a predetermined value is stored in the space portion of the extra length storage part 35 where the extra length storage plate 37 does not extend. .

The extra length accommodating plate 37 may extend in the entire longitudinal direction of the terminal box body 2, or may be divided corresponding to each optical connection part accommodating tool 34. In addition, in the extra length storage portion 35, if the connection extra length 6 of each optical connection portion 5 can be maintained at a bending radius larger than a prescribed radius,
A tray or the like other than the extra length storage plate 37 may be installed.

The connection terminal box for an optical fiber cable according to the present embodiment has a single-core optical fiber core wire 3 and an outdoor wire cable which are led out from the optical fiber cable 1 at a branching portion 4 with a length equal to or larger than a reference length. The single-core outdoor wire Oj derived from O is optically connected via the optical connecting portion 5, and the optical connecting portion 5 is appropriately connected according to the length of the connection extra length 6 generated by the optical connecting. Stored in the storage device 34, this optical connection storage device 3
The extra connection length 6 is mounted on the radius maintaining member 38 in the vicinity of 4. By doing so, even when the length of the optical fiber core wire 3 led out from the optical fiber cable 1 is short, it is possible to efficiently carry out the storage work corresponding to the length. Further, since these optical connection part accommodating tools 34 are arranged along the longitudinal direction of the optical fiber cable 1 with their positions in the width direction of the terminal box body 2 displaced from each other,
It is possible to avoid interference between the connection extra lengths 6 of the optical connection parts 5 housed in the respective optical connection part storage tools 34, and to set the installation intervals of the optical connection part storage tools 34 in the width direction of the terminal box body 2 to the above-mentioned Since it can be shortened as compared with the first connection portion storage portion 23 of the connection portion storage tray 7 of the first embodiment, the widthwise dimension of the terminal box body 2 is reduced. Further, in the extra length storage portion 35, the connection extra lengths 6 of the optical connection portion 5 are stored in a distributed manner along the longitudinal direction of the optical fiber cable 1. It can be efficiently stored, and in particular, the storage space for the extra connection length 6 in the width direction of the terminal box body 2 can be greatly reduced.

It should be noted that, if the optical connector storages 34 are distributed in the longitudinal direction of the optical fiber cable 1, they should be installed in the terminal box body 2 other than on the extra length storage plate 37, for example, near the bottom plate 15. Is also possible.

[0028]

As described above, according to the optical fiber cable connection terminal box of the first aspect, the terminal box main body and the optical fiber core wire led out from the optical fiber cable are provided inside the terminal box main body. A branch part for branching one or more optical fiber cores from a bundle, and a connection part housing for accommodating the optical connection part and the extra connection length of the optical connection part in the central part along the longitudinal direction of the optical fiber cable. A tray accommodating portion for accommodating a large number of trays in a stacked state, the connecting portion accommodating tray having a tray main body for accommodating the extra connection length, and a length protruding outside the tray main body, The optical connection part is formed so that the optical connection part can be housed at any position, and the optical connection part storage part is arranged along the longitudinal direction of the optical fiber cable in the terminal box body. Even if there is a difference in the connection extra length of the optical fiber core that is derived with a length longer than the possible standard, the optical connection part storage part is created according to the connection extra length of the optical fiber core. Since the optical connection part can be stably stored by selecting the storage position to the optical connection part, the optical connection part and the connection extra length of the optical fiber cores connected by this optical connection part have the same connection part storage tray. The versatility of organizing and storing in the terminal box has been improved, and it is possible to store a large number of optical connection parts and connection extra length in the terminal box body without confusion and at the same time, and to connect the optical connection when switching the connection. It is also possible to efficiently perform the work of pulling out the parts or storing them again. Further, as a result, even when the connection extra length of the optical fiber core wire is short, it is not necessary to provide a storage portion for the optical connection portion for the extra extra length in the terminal box main body. The body can be downsized.

According to the optical fiber cable connection terminal box of the second aspect, the terminal box body and the inside of the terminal box body,
A branch portion for branching one or more optical fiber cores from a bundle of optical fiber cores led out from the optical fiber cable, and a plurality of branching parts are provided continuously along the optical fiber cable longitudinal direction, and the optical connection part is housed inside. An optical connection part storage tool and an extra length storage part that extends along the longitudinal direction of the optical fiber cable and stores a connection extra length of each optical connection part stored in the optical connection part storage tool. In the case where there is a difference in the extra length of the optical fiber core wire derived from the optical fiber cable with a length longer than the standard for optical connection, the optical connection part storage device selected according to the extra length By storing the optical connection part between the optical fiber cores, the storage work can be performed efficiently. Further, since these optical connection part storage tools are arranged continuously along the longitudinal direction of the optical fiber cable by shifting the positions in the width direction of the terminal box body from each other, the optical connection parts stored in the respective optical connection part storage tools. It is possible to avoid interference between the extra connection lengths, and it is possible to shorten the installation interval of the optical connection part accommodating tool in the width direction of the terminal box body, and particularly reduce the size of the terminal box body in the width direction.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a connection terminal box for an optical fiber cable according to the present invention.

FIG. 2 is a side view showing a longitudinal end face of a terminal box body in the optical fiber cable connection terminal box of FIG. FIG.

FIG. 3 is a bottom view of the optical fiber cable connection terminal box of FIG. 1.

FIG. 4 is a cross-sectional view taken along the line AA of the optical fiber cable connection terminal box in FIG.

FIG. 5 is an enlarged perspective view showing an optical connection part accommodating part of a connection part accommodating tray in the connection terminal box for the optical fiber cable of FIG. 1.

6 is a development view showing a connection part storage tray in the optical fiber cable connection terminal box of FIG. 1. FIG.

FIG. 7 is a cross-sectional view taken along the line BB of the optical fiber cable connection terminal box of FIG.

FIG. 8 is a front sectional view showing a connection terminal box for an optical fiber cable according to a second embodiment of the present invention.

9 is a bottom view showing the optical fiber cable connection terminal box of FIG. 8. FIG.

10 is a view showing the connection terminal box for the optical fiber cable of FIG. 8, and is a perspective view showing an extra length storage plate.

FIG. 11 is a view showing the connection terminal box for the optical fiber cable in FIG. 8, and is a plan sectional view showing an extra length storage plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical fiber cable, 2 ... Terminal box main body, 3 ... Optical fiber core wire, 4 ... Branch part, 5 ... Optical connection part, 6 ... Extra connection length,
Reference numeral 7 ... Connection section storage tray, 8 ... Tray storage section, 22 ... Tray body, 23 ... Optical connection section storage section (first connection section storage section), 34 ... Optical connection section storage tool, 35 ... Extra length storage section, O ...
Outdoor line cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kengo Fukatsu 4-35-3 Yoyogi, Shibuya-ku, Tokyo Inside Japan Recom Co., Ltd.

Claims (2)

[Claims] 1. An optical fiber cable connection for branching / connecting an optical fiber cable (1) to another optical fiber cable (O) through an optical connector (5) consisting of an optical connector or a fusion splicing part. In a terminal box, a terminal box body (2) and a bundle of optical fiber core wires (3) led out from an optical fiber cable are provided inside the terminal box body (1).
A branch portion (4) for branching the optical fiber cores or more and a central portion along the longitudinal direction of the optical fiber cable accommodates the optical connection portion and the extra connection length (6) of the optical connection portion inside. A tray storage part (8) for storing a large number of connection part storage trays (7) in a stacked state, and a tray main body (22) for storing the extra connection length in the connection part storage tray; and an outside of the tray main body. An optical connection portion storage portion (which has a length protruding to the inside thereof and is formed so as to be able to store the optical connection portion at an arbitrary position in the longitudinal direction thereof and is arranged along the longitudinal direction of the optical fiber cable in the terminal box body ( 23) and a connection terminal box for an optical fiber cable. 2. An optical fiber cable connection terminal box for branching / connecting an optical fiber cable to another optical fiber cable via an optical connector or an optical connecting section consisting of a fusion splicing section, a terminal box body, Inside the terminal box main body, a plurality of branch portions for branching one or more optical fiber core wires from a bundle of optical fiber core wires derived from the optical fiber cable, and a plurality of branch parts are continuously provided along the optical fiber cable longitudinal direction, An optical connection part accommodating tool (34) for accommodating the optical connection part, and an extra connection length of each optical connecting part extending in the longitudinal direction of the optical fiber cable and accommodated in the optical connection part accommodating tool. Extra length storage (35)
A connection terminal box for an optical fiber cable, comprising: