JP4637000B2 - Optical cable connection closure - Google Patents

Description

  The present invention relates to an optical cable connection closure, and more particularly to an optical cable connection closure used when an optical drop cable is drawn from an optical cable into a house in FTTH (Fiber To The Home).

  In recent years, a form in which an optical fiber is directly drawn into a subscriber's house in a network using an optical fiber cable is called FTTH. Generally, about 1 to several optical cables are wired in the vicinity of a subscriber's home as a network of a telecommunications carrier. In FTTH, the required number of cores is drawn from this optical cable by a drop optical cable or the like. Be drawn into. Since FTTH draws an optical fiber into an unspecified location (subscriber's home) where a subscription application is desired, the extra length necessary for connection is extracted from the existing optical cable and connected to the drop optical cable. used. The rear branch type closure is directly attached to the wired optical cable, strips off the outer sheath of the optical cable inside the closure, cuts out the required number of cores, takes out, uses the remaining length of the stripped strip, and connects to the drop optical cable. It is to be stored. Therefore, the remaining optical fibers are connected as they are and go downstream, and are used for FTTH to another subscriber's house. In addition, shortening of the service start period, switching of contracts, and the like are increasing, and connectors for easily attaching and detaching optical fiber core wires have come to be used.

In the closure for branching, drawing in, connecting, etc. of the optical cable as described above, the cable cores are connected to each other, and this connection part and the cable core connection for storing the extra length of the cable core are accommodated. A closure provided with an extra length storage tray is known (see, for example, Patent Document 1).
As shown in FIGS. 10 and 11, the optical cable connection closure 100 described in Patent Document 1 is provided in a tray holder 102 in which a core wire tray 101 is fixed in the closure 100. This core wire tray 101 is connected to each other by a hinge portion 103 in a superposed state in a plurality of layers so as to form a set, and a connector and a core wire extra length can be individually and collectively stored for each single core branched from the tape core wire. A core drop tray 104 is configured. The core drop tray 104 is detachably fitted to a plurality of tray holders 102 provided in a plurality of stages in the closure 100, so that the connector and the extra length of the core can be collectively stored for each branched single core. The core drop tray 104 can be stored at a high density, and is used as a connection function-dedicated closure or a drop function-dedicated closure.
JP 2001-42155 A (FIGS. 1 and 6)

  By the way, the functions required for the post-branch type closure are that the drop optical fiber can be pulled down, the tape core type drop cable is pulled down, and the cut optical fiber core is reused on the downstream side. Various functions such as a sending function are required. That is, even if the drop optical fiber (single core) is drawn, if the contract is canceled after several months, it is necessary to cut the inside of the closure. Also, in the same apartment or apartment, it is more efficient to pull in with a drop cable of a tape core (for example, a 4-core tape core) and branch in a building rather than a single core. Also, where there are many cancellations, it remains disconnected, but if a customer contract occurs on the downstream side, the product that has been disconnected in the upstream closure is “interrupted” to the downstream side. It is necessary to connect them.

  In recent years, the function of the connector has been enhanced, and various types of connectors can be directly connected to the connector on the connection side. On the other hand, since it may be possible to break the storage tray in which a thin core wire such as a 0.25 mm core wire and an optical cable are mixed, it is necessary to consider a preventive measure.

  Furthermore, as the FTTH is prosperous because the rear branch type closure can be installed anywhere, it will be installed in many places. From the residents of apartments and condominiums with rooms at the height of the power pole, “disturbance”, “light There are many complaints such as “reflect”, and it is necessary to make it as small as possible from the viewpoint of landscape.

  An object of the present invention is to mainly provide a closure for connecting an optical cable that can separately accommodate a thin core wire and a thick optical cable to protect the thin core wire, improve workability, and further reduce the size. There is to do.

In order to achieve the above-described object, an optical cable connection closure according to the present invention cuts out a required optical fiber core from any point of an optical cable having a plurality of optical fiber cores, and a branch cable gripping portion of the branch cable. A post-branch type optical cable connection closure that is connected to a branch optical fiber core cut out from the branch cable at a more distal end and accommodates the remaining optical fiber core core without being cut . in the housing, the cut optical fiber and the connector housing portion for accommodating a respective connector for connecting the branch optical fiber, co next-data connection has been cord excess of the branch optical fiber a core wire excess length accommodating portion for accommodating a length, a tray and a wiring gap for wiring pre SL min岐光fiber provided, the tray Square together with the the housing space provided branch cable excess length accommodating portion for accommodating the extra length of the branch cable to be introduced within the housing of gripping the branch cable on the side and below the tray of the tray The branch cable gripping portion is provided.

  In the optical cable connection closure configured as described above, a necessary optical fiber core of the optical fiber contained in the optical cable is cut at any point of the optical cable, and the branch cable is connected to the optical fiber core. Connect. At this time, since the connector for connecting the optical fiber core wire and the branch cable is housed in the connector housing portion of the tray, the connector can be securely connected without rattling, and an increase in connection loss can be prevented. Can do. In addition, the extra length of the branch optical fiber from which the outer sheath connected to the connector on the branch cable side is removed is stored in the extra core length storage portion of the tray, and the extra length of the branch cable covered by the outer sheath is stored. The length is stored in a branch cable surplus storage section provided below the tray. Thereby, a thin branch optical fiber and a thick branch cable can be distinguished and accommodated, and the safety of the branch optical fiber that is easily damaged can be ensured. The branched optical fiber core wire can be wired downward from the wiring space of the tray. Further, since the branch cable with the jacket is gripped by the branch cable gripping portion provided on the side surface of the tray or below, the wiring can be organized.

The closure for connecting an optical cable according to the present invention is such that the connector storage portion is provided in a V shape so as to be inclined downward with respect to the horizontal direction of the tray symmetrically with respect to the center of the connector storage portion. It is in forming a part of .

  In the optical cable connection closure configured as described above, the connector housing portion is symmetrically inclined with respect to the center and is V-shaped. Therefore, when wiring the branched optical fiber core wire downward from the wiring gap, Wiring can be done without abrupt bending. Further, when the cut optical fiber cores are connected by a cord having connectors attached to both sides, both connectors are accommodated so as to face each other across the center in the same groove. At this time, the length can be ensured by making it V-shaped to prevent interference.

  The optical cable connection closure according to the present invention includes a vertical wall in which the connector storage portion individually stores the connectors, and a locking protrusion provided on the vertical wall to prevent the connector from being lifted. There is in being.

  In the optical cable connection closure configured as described above, the connectors can be individually accommodated between the vertical walls, and the connectors can be prevented from falling off by the locking projections provided on the vertical walls.

Moreover, the closure for optical cable connection concerning this invention exists in having the space | gap for connector extrusion in the bottom part of the said connector accommodating part which forms a part of said tray .

  In the optical cable connection closure configured as described above, the connector housed in the connector housing portion can be easily taken out by pushing it up with a finger or the like from the gap for pushing out the connector, thereby improving workability. Can do. It is also possible to provide one continuous long gap so as to serve as the connector pushing gap and the wiring gap described above.

  In the optical cable connection closure according to the present invention, the holding member for holding the optical fiber core wire that is housed without being cut is provided with a first holding portion that always holds the optical fiber core wire, and a tape core. A second holding part for moving and holding the optical fiber core to the back side during a single fiber separation operation, and an attachment part for mounting the holding member so as to be movable in the axial direction of the optical fiber core; It is in having.

  In the optical cable connection closure configured as described above, the optical fiber core wire that is accommodated as it is without being cut is normally held by the first holding portion of the holding member. At the time of the heart separation work, it is moved to the back side and held by the second holding portion of the holding member. For this reason, it is possible to hold the irrelevant optical fiber core in a place where it does not interfere with the work during the single core separation work of the tape core, so that it prevents the tool from colliding and damaging the irrelevant optical fiber core. Workability can be improved. In addition, since the holding member can be attached so as to be movable in the axial direction of the optical fiber core by the attachment portion, the holding position of the optical fiber core to be connected is adjusted to optimize the slack of the optical fiber core. And workability can be improved.

  In the optical cable connection closure according to the present invention, the closure housing includes a wide portion in which the tray and the branch cable extra length storage portion are included in a central portion in a longitudinal direction of the optical fiber core wire, and the wide width portion. There is a width detail for gripping the optical cable on both the front and rear sides of the part, and the entire side surface is T-shaped.

  In the optical cable connection closure configured in this manner, the width of the front and rear sides in the axial direction of the casing is made small, so that the closure is compact in appearance and the appearance can be improved. Further, since the area of the side surface of the housing is reduced, the influence of wind can be reduced and the weight can be reduced.

  In the optical cable connection closure according to the present invention, the connector housing portion is provided with a holder for fixing and holding the connector, and the holder is swingably attached.

  According to the present invention, the tray is provided with the extra cable length storage portion for storing the extra length of the branched optical fiber from which the outer jacket connected to the connector on the branch cable side is removed, and is covered with the outer jacket. Since the branch cable extra length storage section that stores the extra length of the branch cable is provided below the tray, it is possible to distinguish and store the thin branch optical fiber core wire and the thick branch cable. The effect that the safety | security of a line can be ensured and workability | operativity can be improved is acquired.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing a first embodiment of an optical cable connection closure according to the present invention, FIG. 2 (A) is an overall perspective view of the inside of the closure, and FIG. 2 (B) is an enlarged view of a portion B in FIG. 3 is a plan view of the connector housing portion, FIG. 4 is a perspective view showing a state in which the connector housed in the connector housing portion is pushed out with a finger, FIG. 5A is a perspective view of the clamp, and FIG. FIG. 6B is a front view showing the attached state, and FIG. 6 is a side view of the housing.

  As shown in FIGS. 1 and 2, the optical cable connection closure 10 according to the first embodiment of the present invention includes an optical fiber core 11 a necessary from an arbitrary point of an optical cable 12 having a plurality of optical fiber cores 11. Is connected to the branch cable 13, and the remaining optical fiber core wire 11b is a post-branch type closure that is received without being cut. Then, a branch optical fiber core connected to a connector housing portion 21 (see FIG. 3) for housing the connector 14 for connecting the cut optical fiber core wire 11a and a plug 14b which is a mating connector facing the connector 14. The core wire extra length storage portion 22 for storing the core wire extra length 15a of the wire 15 and the wiring gap 23 for wiring the branched optical fiber core wire 15 housed in the core wire extra length storage portion 22 downward ( The tray 20 is provided. Further, a branch cable surplus length storage portion 31 that stores the surplus length of the branch cable 13 is provided below the tray 20 (downward in FIG. 1), and the branch cable gripping that grips the branch cable 13 on the side surface and below the tray 20. Portions 24a and 24b are provided.

  As the optical cable 12, a slot cable can be used, and as the optical fiber core wire 11, a multi-core (for example, four cores) tape core wire accommodated in the slot groove of the optical cable 12 can be used. Moreover, as the branch cable 13, the drop cable 13a using the single core drop optical fiber 13b for drawing in in each household, and the multi-core tape core wire for drawing in apartment houses, such as an apartment, can be used. Furthermore, in order to connect the optical cables 12 that have been cut off, the branching cable 13 can be an insertion cord 13c having connectors attached to both ends. The connector 14 means both the socket 14a and the plug 14b. Therefore, as described above, since various types of branch cables 13 are used, various types of plugs 14b are used (see FIG. 3).

  As shown in FIG. 1 and FIG. 2, a main frame 16a penetrating in the wiring direction is provided in the closure 10, and through attachment brackets 16b provided below from both ends of the main frame 16a. A tray 20 is attached. Moreover, the cable fixing | fixed part 16c which fixes the optical cable 12 is provided in the both ends of the main frame 16a.

  Above the central portion of the tray 20 is provided with a core wire holder 20d for storing the remaining core wires after tearing the tape of the drop cable 13a in the axial direction (left and right in FIGS. 1 and 2). Connector housing portions 21 are provided on both the left and right sides of the core wire holder 20d. As shown in FIG. 2B, the outer peripheral wall 20a of the tray 20 is provided with a part 20b that is partially displaced outward, and a gap 20c is formed between the displaced part 20b and the outer peripheral wall 20a. Is provided. Therefore, by passing the branch cable 13 through the gap 20c, the branch optical fiber 15 is hooked on the shifted portion 20b or separated from the branch cable 13 from the outside of the outer peripheral wall 20a of the tray 20 to the inside or from the inside to the outside. It can be wired.

  As shown in FIG. 3, the connector storage portion 21 is provided with vertical walls 21 a at predetermined intervals to form groove portions 21 b for individually storing the connectors 14. The groove portion 21b is long in the axial direction, and even when the optical fiber core wire 11a is cut by the connector connection (for example, a cut of about 20 mm occurs due to one failure of the connector connection). The connector 14 can be securely held. Further, the connector 14 can be accommodated from both the front and rear sides in the axial direction. At the upper end of the vertical wall 21a, a locking projection 21c protruding toward the groove 21b is provided, which prevents the connector 14 from lifting due to vibration or the like and makes a clicking sound when inserted, so that it can be securely stored. it can. The socket 14a that is not connected to the plug 14b can be stored alone.

Further, the above-described wiring gap 23 and connector pushing gap 23a are provided at the bottom of the groove 21b. As shown in FIG. 4, the gap 23a for pushing out the connector is used when the connector 14 accommodated in the groove 21b is pushed up from below the tray 20 with a finger M or a thin bar-like member. Thereby, since the connector 14 can be easily taken out from the connector storage part 21, workability | operativity can be improved.
In addition, it is not necessary to provide the wiring gap 23 and the connector push-out gap 23a separately, so that one continuous long gap is provided to serve as the connector push-out gap and the above-described wiring gap. Is also possible.

  As shown in FIG. 2, a cord extra length storage portion 22 is provided adjacent to the connector storage portion 21 on the tray 20. This core wire extra length storage part 22 stores the extra length of this single core wire when a 0.25 mmφ single core wire is connected to the plug 14b as the branch optical fiber core 15. In addition, when a drop cable 13a having, for example, a four-core tape core is used as the branch cable 13, the tape core is separated into a single core and attached with a connector. It is stored in the long storage portion 22. In this case, the length difference (inner ring difference) generated when each single core wire of the tape core wire is individually guided to the groove 21b is absorbed, and a bending radius greater than the allowable bending radius is secured for each single core wire. can do.

  On the other hand, as shown in FIG. 1, a lower frame 33 is horizontally provided below the tray 20 via a metal fitting 32, and a branch cable extra length storage portion 31 is provided on the lower frame 33. Yes. The branch cable extra length storage unit 31 stores an optical cable with a jacket (drop optical fiber 13b, drop cable 13a, cord 13c, etc.), and the optical cable stored therein is provided in the connector storage unit 21. The wiring gap 23 is wired to the upper side of the tray 20 and is connected to the connector. These cables with jackets are easy to handle and can be wired in the air, so they can be freely stored under the tray 20.

As shown in FIGS. 1 and 2 (A), branch cable gripping portions 24a and 24b for gripping the branch cables 13a and 13b wired on the outer side and the lower side of the tray 20 are provided on the side surface and the lower side of the tray 20, respectively. Is provided. The branch cables 13 a and 13 b are led out downward through the metal fitting 32.
The branch cable gripping portion 24a provided on the side surface of the tray 20 is a member that grips the drop cable 13a. That is, as shown in FIG. 2B, the branch cable gripping portion 24a grips the tip of the outer cover of the drop cable 13a, and the branch optical fiber core 15 separated from the tape core of the drop cable 13a is a tray. 20 is routed from the gap 20c of the outer peripheral wall 20a to the core wire extra length storage portion 22 of the tray 20.
The branch cable gripping portion 24b provided below the tray 20 grips the outer cover of the drop optical fiber 13b wired below the tray 20, for example, and guides it to the outside of the closure 10. Yes.

  FIGS. 5A and 5B show a clamp 40 for gripping the optical fiber core wire 11 that is separated by removing the jacket of the optical cable 12. At the center of the clamp 40, an attachment portion 41 for attaching the clamp 40 to the main frame 16a is provided. The attachment portion 41 corresponds to the cross-sectional shape of the main frame 16a, and is attached so as to be movable in the axial direction along the main frame 16a.

  Further, a first holding portion 42 that always holds all the optical fiber core wires 11 is provided at one end portion of the clamp 40. In the first holding portion 42, the optical fiber core wire 11 is gripped by winding the cord-like member 42 a around the optical fiber core wire 11 and engaging the engaging portion 42 b at the tip of the cord-like member 42 a. I am doing so. The grasped optical fiber core wire 11 can be taken out by removing the engaging portion 42b of the string-like member 42a. In this form, the string-like member 42 a can be opened downward, and the optical fiber core wire 11 can be easily moved to the second holding portion 43. Moreover, you may employ | adopt the form which opens upward as a string-like member as another form. When the string-like member is opened upward, the optical fiber core wire can be held with the upward shape restoring force.

  Further, a second optical fiber 11b is moved to the inner side of the main frame 16a and held at the other end without being cut when the single fiber core is separated. A holding portion 43 is provided. The second holding portion 43 is for temporarily retracting the optical fiber core wire 11b so as not to obstruct the operation during the single core separation operation of the tape core wire. It has a structure that only hooks.

  Accordingly, the optical fiber core wire 11 is always securely held by the first holding portion 42 so that it does not vary, and the first holding portion 42 is released and cut when the core wire is connected. The optical fiber core wire 11b that is not cut other than the optical fiber core wire 11a to be connected is held by the second holding portion 43. Thereby, it is possible to avoid damaging the other optical fiber core wire 11b during the single core separation operation of the desired optical fiber core wire 11a, thereby improving the workability. Further, since the clamp 40 is attached so as to be movable in the axial direction of the main frame 16a, the holding position of the optical fiber core wire 11a to be connected can be adjusted to optimize the slack of the optical fiber core wire 11a. Workability can be improved.

As shown by the two-dot chain line in FIG. 1 and as shown in FIG. 6, the casing 17 of the closure 10 encloses the tray 20 and the branch cable extra length storage portion 31 in the center portion in the longitudinal direction of the optical fiber core wire 11. A wide portion 17a and width details 17b for gripping the optical cable are provided on both front and rear sides of the wide portion. Therefore, the overall side surface shape is T-shaped as shown in FIG.
Thereby, the closure 10 becomes compact by the whole appearance, and an external appearance can be improved. Moreover, since the area of the side surface of the housing | casing 17 becomes small, while being able to reduce the influence of a wind, weight reduction can be achieved.

Next, the core wire connection work for connecting the branch cable 13 to the wired optical cable 12 will be described.
First, the jacket of the optical cable 12 in the vicinity of the desired connection point is removed slightly shorter than the length of the closure 10 to expose the optical fiber core wire 11, and cable fixing provided at both ends of the main frame 16 a of the closure 10. The main frame 16a is attached to the jacket of the optical cable 12 by the portion 16c. At this time, the optical fiber core wire 11b other than the optical fiber core wire 11a cut to perform the connection work among the optical fiber core wires 11 is moved to the back side of the main frame 16a and attached to the main frame 16a. The second holding part 43 of the clamp 40 is temporarily held. A socket 14a is attached to the end of the cut optical fiber core wire 11a.

  When connecting a drop cable 13a having a multicore tape core wire as the branch cable 13, the outer sheath of the end portion of the drop cable 13a is removed by a predetermined length to expose the tape core wire. The included branch optical fiber 15 is separated. Then, a plug 14 b is attached to the tip of each branch optical fiber core wire 15. The drop cable 13a is introduced into the closure 10 from the side with the fine width, and the end portion of the outer cover of the drop cable 13a is held by the branch cable holding portion 24a provided on the side surface of the tray 20 through the metal fitting 32. The exposed branched optical fiber 15 is routed inside the tray 20 through the gap 20c of the outer peripheral wall 20a of the tray 20, and the length is adjusted in the extra length housing portion 22 so that the plug 14b is connected to the optical cable 12. Connect to socket 14a. The connected socket 14a and plug 14b are accommodated in the connector accommodating portion 21. Finally, the housing 17 is attached.

  When connecting the drop optical fiber 13 b as the branch cable 13, the drop optical fiber 13 b drawn into the closure 10 from the width detail side surface is wired to the branch cable extra length storage portion 31 below the tray 20. The surplus length is stored in the branch cable surplus length storage portion 31, the tip is drawn upward from the wiring gap 23 of the connector storage portion 21 of the tray 20, and the plug 14b is directly attached to the tip of the drop optical fiber 13b. The plug 14b is connected to the socket 14a and stored in the connector storage unit 21. Finally, the housing 17 is attached.

  When the cord 13 c is connected as the branch cable 13, the cord 13 c is not drawn out of the closure 10. The cord 13c is accommodated in a branch cable surplus length storage portion 31 below the tray 20 to adjust the surplus length, and the plugs 14b attached to both ends are passed through the wiring gap 23 of the connector storage portion 21 of the tray 20 and moved upward. And is connected to the socket 14a and stored in the connector storage portion 21. Finally, the housing 17 is attached.

  As described above, in the optical cable connection closure 10 described above, the connector 14 for connecting the optical fiber core wire 11 and the branch cable 13 is stored in the connector storage portion 21 of the tray 20, so that the connector 14 does not rattle. And increase in connection loss can be prevented. Further, the extra length of the branched optical fiber 15 from which the outer sheath connected to the plug 14b on the branch cable 13 side is removed is accommodated in the extra core length accommodating portion 22 of the tray 20 and covered with the outer envelope. The excess length of the branch cable 13 is stored in a branch cable excess length storage portion 31 provided below the tray 20. Thereby, the thin branch optical fiber core wire 15 and the thick branch cable 13 can be distinguished and accommodated, and the safety of the branch optical fiber core wire 15 that is easily damaged can be ensured.

Next, another embodiment is shown in FIGS. In addition, the same code | symbol is attached | subjected to the site | part which is common in the site | part mentioned above in FIGS. 1-6, and the overlapping description is abbreviate | omitted.
In the optical cable connection closure 10 according to the above-described embodiment, the connector storage portion 21 provided in the tray 20 is formed flat. However, as shown in FIGS. 7 and 8, the connector storage portion 21B is stored in the connector storage portion. It can also be formed in a V shape that is symmetrically inclined with respect to the center of the portion 21B.

  In this case, when the branch cable 13 is wired downward from the wiring gap 23, the branch cable 13 is directed obliquely downward, so that the wiring can be performed without abrupt bending. Further, as shown in FIG. 8, when connecting the cut optical fiber cores 11a with cords 13c having connectors (plugs 14b) attached to both sides, both connectors 14 are connected to the same groove bracket 21b. And so as to face each other across the center. At this time, the length can be ensured by making it V-shaped to prevent interference.

FIG. 9 shows another embodiment of the connector housing. As shown in FIG. 9A, in the V-shaped connector housing portion 21, a holder 50 for fixing and holding a connector is provided between a plurality of parallel walls 21c, 21c. As shown in FIG. 9B, the holder 50 is provided with a locking projection 51 at one end and a shaft receiving portion 52 at the other end. The shaft receiving portion 52 receives a shaft bar 53 arranged so as to connect the adjacent vertical walls 21c and 21c of the connector housing portion 21, and the holder 50 can be turned upward with the shaft rod 53 as a fulcrum. Mobile). The locking projection 51 is locked in a hole 54 formed in the bottom of the connector housing portion 21 to fix the holder 50.

  A first locking hole 55 is formed on the upper surface of the holder 50 on the front side, and a second locking hole 56 is formed in the vicinity of the middle. The first engagement formed on the bottom surface of the connector 57 as shown in FIG. The connector 57 can be fixed to the holder 50 by engaging with the stop piece 58 and the second engaging piece 59. In order to fix the connector 57 to the holder 50, as shown in FIG. 9D, the connector 57 is disposed slightly rearward with respect to the holder 50, and the first locking piece 58 and the second locking piece 59 are placed in the holder 50. Are inserted into the first locking hole 55 and the second locking hole 56. Thereafter, as shown in FIG. 9E, when the connector 57 is slid forward, the hole and the locking piece are engaged and fixed to the holder 50.

  In the embodiment shown in FIG. 8 described above, for example, when only the plug is to be taken out, the plug can be taken out after taking out the socket and the plug from the connector housing portion. On the other hand, in the embodiment shown in FIG. 9, the holder to which the socket and the plug are fixed can be pivoted upward as indicated by the arrow to remove only the plug, so that the socket does not need to be removed, and The removal operation can be performed easily.

  The optical cable connection closure of the present invention is not limited to the above-described embodiments, and appropriate modifications and improvements can be made.

  As described above, the closure for connecting an optical cable according to the present invention trays the extra length storage portion for storing the extra length of the branched optical fiber from which the jacket connected to the connector on the branch cable side is removed. In addition to the branch cable extra length storage section tray that accommodates the extra length of the branch cable covered with the jacket, it is possible to distinguish and store thin branch optical fiber core wires and thick branch cables. It is possible to secure the safety of the branched optical fiber core that is easily damaged, and to improve the workability. For example, in FTTH, it is used when an optical drop cable is drawn from an optical cable into a house. It is useful as a closure for connecting optical cables.

It is a side view which shows 1st Embodiment which concerns on the optical cable connection closure of this invention. (A) is a whole perspective view of a closure. FIG. 2B is an enlarged plan view of a portion B in FIG. It is a top view of a connector storage part. It is a perspective view which shows the state which has pushed out the connector accommodated in the connector accommodating part with the finger | toe. (A) is a perspective view of a clamp. (B) is a front view which shows the attached state. It is a side view of a housing | casing. It is a side view of the connector storage part concerning another embodiment. It is a perspective view of the connector storage part concerning another embodiment. It is explanatory drawing of the connector accommodating part concerning another embodiment. (A) is a partially broken plan view of a conventional closure. (B) is a partially broken side view of a conventional closure. (A) is a top view of the state which built the core wire tray in the core wire drop tray. (B) is a top view of the state which expanded the core wire tray partially.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical cable connection closure 11 Optical fiber core wire 11a The cut | disconnected optical fiber core wire 11b The remaining optical fiber core wire 12 Optical cable 13 Branch cable 14 Connector 14b Plug (opposite connector)
DESCRIPTION OF SYMBOLS 15 Branch optical fiber 17 Case 17a Wide part 17b Detail 20 Tray 21 Connector accommodating part 21a Vertical wall 21c Locking protrusion 22 Core wire extra length accommodating part 23 Wiring space | gap 23a Extrusion space | gap 24a, 24b Grasp of branch cable Part 31 Branch cable extra length storage part 40 Clamp (holding member)
41 Mounting portion 42 First holding portion 43 Second holding portion

Claims (7)

A necessary optical fiber core is cut out from an arbitrary point of an optical cable having a plurality of optical fiber cores and connected to the branched optical fiber core cut out from the branch cable at the tip from the branch cable gripping portion of the branch cable, The remaining optical fiber core wire is a post-branch type optical cable connection closure that keeps it as it is without cutting,
In the casing of the closure, a connector housing portion for housing the respective connectors for connecting the cut optical fiber core wire and the branched optical fiber core wire, and a redundant core wire of the branched optical fiber core wire connected to the connector. A tray having a cord extra length accommodating portion for accommodating the length and a wiring gap for wiring the branched optical fiber cord;
A space in the housing below the tray is provided with a branch cable surplus storage portion for storing the surplus length of the branch cable introduced into the housing,
A closure for connecting an optical cable, wherein the branch cable gripping portion for gripping the branch cable is provided on a side surface of the tray and below the tray. The connector storage portion is symmetrical with respect to the center of the connector storage portion and is inclined downward with respect to the horizontal direction of the tray so as to have a V-shape and form a part of the bottom portion of the tray. The optical cable connection closure according to claim 1.   The said connector accommodating part is provided with the vertical wall which accommodates the said connector separately, and the latching protrusion provided in the said vertical wall in order to prevent the said accommodated connector from raising. An optical cable connection closure as described in 1. The optical cable connection closure according to any one of claims 1 to 3, further comprising a gap for extruding the connector at a bottom of the connector housing portion forming a part of the tray .   A holding member for holding the optical fiber core that is received without being cut is a first holding portion that always holds the optical fiber core and the optical fiber core at the time of a single core separation operation of the tape core 2. A second holding portion that holds the holding member by moving it to the back side, and a mounting portion for mounting the holding member so as to be movable in the axial direction of the optical fiber core wire. To 4. The optical cable connection closure according to any one of 1 to 4.   The closure housing includes a wide portion that encloses the tray and the branch cable extra length storage portion in a central portion in a longitudinal direction of the optical fiber core, and a width detail that grips the optical cable on both front and rear sides of the wide portion. The optical cable connection closure according to any one of claims 1 to 5, wherein the entire side surface has a T-shape.   The optical cable connection closure according to claim 1, wherein the connector housing portion includes a holder for fixing and holding the connector, and the holder is swingably attached.

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