JP2012053132A - Optical fiber closure, and holding structure of supporting line and optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber closure, etc. capable of surely protecting a connection part, etc., with excellent workability and a simple structure.SOLUTION: A closure 1 is mainly constituted of an optical fiber tray 7, a cable holding part 9, a cover 3 and an end face cover 5, etc. An optical fiber cable 11 and a supporting line 15 are held by a pair of cable holding parts 9. The cable holding parts 9 are provided in respective vicinities of both end parts of the closure 1 and are fixed to the optical fiber tray 7. The cable holding part 9 is mainly constituted of a pedestal 23 and a pressing member 25, etc. The pedestal 23 is a planar member fixed to the optical fiber tray 7. In the pedestal 23, a female screw part capable of being screwed to a bolt 27 is formed. The pressing member 25 can be mounted on the pedestal 23 by the bolt 27, and a distance between the pressing member 25 and the pedestal 23 can be adjusted by the bolt 27. In the cable holding part 9, a supporting line holding part 29 and an optical fiber cable holding part 31 are formed.

Description

  The present invention relates to an aerial closure or the like for an optical fiber that is used for a connection portion of an optical fiber cable or the like, and is used to accommodate and protect the connection portion or the like of the optical fiber cable.

  Conventionally, an optical fiber closure is used when an optical fiber cable is connected over the air. For example, in the optical fiber closure, the cores of the main optical fiber cable to be connected are drawn out, the ends of each are connected to form a connection part, and the extra fiber cores formed during the connection work The long portion and the connecting portion are accommodated in an optical fiber tray in the optical fiber closure, and are covered and protected by a cover or the like.

  As such an optical fiber closure, for example, as shown in Patent Document 1, a main frame is provided in the closure and an optical fiber tray or the like is attached to the main frame in order to securely protect the connection portion and the like. The main frame ensures the strength of the closure and reliably protects the connection portion and the like.

JP 2007-121773 A

  However, if the main frame is used and the components are attached to the main frame as in the prior art, the miniaturization cannot be achieved and the number of components increases. In addition, if the support wire holding portion is formed outside the closure to hold the support wire that supports the optical fiber cable, the distance between the support wire and the optical fiber cable becomes longer. Work for separating from the support wire is required, and workability is poor. For this reason, a closure with excellent workability and a small and simple structure is required.

  The present invention has been made in view of such problems, and an object thereof is to provide an optical fiber closure or the like that is excellent in workability, has a simple structure, and can reliably protect connection portions and the like.

  In order to achieve the above-described object, a first invention is a closure used for a connection portion of an optical fiber cable, and includes a cable holding portion for holding the cable and an optical fiber capable of storing the connection portion of the optical fiber cable. A tray and a cover that covers the optical fiber tray and the cable holding portion, and the cable holding portion is integrally formed so as to be able to hold a support line and an optical fiber cable, and the integrated cable holding portion. Are respectively provided in the vicinity of both ends of the closure and connected to each other along the laying direction of the optical fiber cable, and the cable holding portion is composed of a pedestal portion and a pressing member, and the pedestal portion and / Or the holding member includes a support wire holding portion for holding a support wire and an optical fiber for holding an optical fiber cable. And the support line and the optical fiber cable are arranged in the support line holding part and the optical fiber cable holding part, respectively, and the support line and the optical fiber cable are connected to the base part and the optical fiber cable, respectively. The support wire and the optical fiber cable are held by being sandwiched between the holding member, and the support wire holding portion and the optical fiber cable holding portion are recessed portions formed in at least one of the pedestal portion or the holding member. The depth of the concave portion in the support line holding portion is shallower than the depth of the concave portion in the optical fiber cable holding portion, and the cable holding portion and the optical fiber tray can be accommodated inside the cover. It is the optical fiber closure characterized.

  A pair of said cable holding parts may be connected by the said optical fiber tray, and the said cable holding part may be fixed with the said support line between a pair of said cable holding parts, and the said optical fiber tray.

  According to the first invention, since the cable holding portion that integrally holds the support line and the optical fiber cable is formed inside the closure, it is not necessary to separately form the holding portions of the support line and the optical fiber cable. . For this reason, the number of parts is small and the structure is simple.

  In addition, since the holding portion of the support wire and the optical fiber cable is formed inside the closure, the arrangement distance between the support wire and the optical fiber cable is short, and the workability during installation is excellent.

  Even in this case, the support wire and the holding portion of the optical fiber cable are integrated, so that downsizing can be achieved.

  In addition, the cable holding part is composed of a pedestal part and a pressing member, and the support wire and the optical fiber cable are sandwiched together by the pedestal and the pressing member, so there is no need for a holding member for holding each cable. Yes, installation work is also easy.

  Further, the support line holding part and the optical fiber cable holding part are each a recess formed in the base or the pressing member, and each cable is held in the recess, so that the cable does not come out of the holding part. Also, for the holding part of the optical fiber cable whose outer diameter is larger than that of the support wire, by increasing the depth of the recess, the pressing member is less likely to be inclined with respect to the base, and the cable can be pressed straight. it can.

  In addition, since the cable holding part is directly fixed and connected to the optical fiber tray, the support wire, the optical fiber tray, and the entire cable holding part are configured in a frame shape without separately forming a frame or the like. Since it can be secured, a compact closure can be obtained.

  A second invention is a holding structure of a support line and an optical fiber cable in a closure used for a connection part of an optical fiber cable, and is constituted by a pedestal part and a pressing member, and a cable holding part for holding the cable, An optical fiber tray capable of accommodating the connection portion of the optical fiber cable; and a cover covering the optical fiber tray and the cable holding portion, wherein the cable holding portion is capable of holding a support wire and an optical fiber cable. A pair of the cable holding portions formed integrally and provided in the vicinity of both end portions of the closure are connected to each other along the laying direction of the optical fiber cable by the optical fiber tray. And / or the holding member includes a support wire holding portion for holding a support wire and an optical fiber cable. An optical fiber cable holding part for holding a cable, and the support line and the optical fiber cable arranged in the support line holding part and the optical fiber cable holding part, respectively, The support line holding part and the optical fiber cable holding part are arc-shaped recesses formed in at least one of the pedestal part or the pressing member, and the support line holding part includes the support line holding part and the optical fiber cable holding part. A holding wire and an optical fiber cable holding, wherein a radius of curvature of the concave portion is larger than a radius of the supporting line, and a radius of curvature of the concave portion in the optical fiber cable holding portion is larger than a radius of the optical fiber cable. Structure.

  The cable holding part may be integrally formed with a branch cable holding part capable of holding a branch cable.

  According to the second invention, the strength of the closure can be reliably maintained without separately providing a frame structure such as a main frame, and the support wire and the optical fiber cable can be collectively held. Is simple and small, and because the radius of curvature of each holding part is larger than the outer diameter of the support wire and the optical fiber cable, it is possible to cope with variations in the outer diameter of each cable. The same structure can be used for this cable, and a holding structure capable of reliably holding the support wire and the optical fiber cable can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in workability | operativity, An optical fiber closure etc. which can protect a connection part etc. reliably with a simple structure can be provided.

It is a figure which shows the closure 1, (a) is a front view, (b) is a top view. It is a figure which shows the cable holding structure 10, (a) is an AA arrow directional view of FIG.1 (b), (b) is an exploded view of the cable holding part 9. FIG. (A) is sectional drawing which shows the support line 15, (b) is sectional drawing which shows the optical fiber cable 11, (c) is sectional drawing which shows the pressing member 25. The figure which shows the frame structure 35 of the closure 1. FIG. It is a figure which shows other embodiment, (a) is a figure which shows the cable holding structure 10a, (b) is a figure which shows the cable holding structure 10b. The figure which shows the cable holding structure 10c. The figure which shows the cable holding structure 10d.

  Hereinafter, the closure 1 concerning embodiment of this invention is demonstrated. 1A and 1B are diagrams showing an optical fiber closure 1 used for a connection portion of an optical fiber cable, where FIG. 1A is a front view and FIG. 1B is a plan view. 1A is a diagram illustrating a state where the cover 3 is seen through, and FIG. 1B is a diagram illustrating a state where the cover 3, the end surface cover 5 and the like are removed.

  The closure 1 mainly includes an optical fiber tray 7, a cable holding unit 9, a cover 3, an end surface cover 5, and the like. In the following description, a state where the cover 3 and the end surface cover 5 are removed is also referred to as a closure 1.

  The closure 1 is used for a connection portion between optical fibers in the optical fiber cable 11 and protects the connection portion. The optical fiber cable 11 is supported by a support line 15 outside the closure 1. The support wire 15 is, for example, a steel wire.

  The optical fiber cable 11 and the support wire 15 are held by a pair of cable holding portions 9. The cable holding portions 9 are respectively provided in the vicinity of both end portions of the closure 1. Since the optical fiber cable 11 is held by the cable holding portion 9, it is possible to prevent tension or the like from being applied to the connection portion or the like of the optical fiber inside the closure 1.

  The cable holding part 9 is fixed to the optical fiber tray 7. That is, the pair of cable holding portions 9 are connected by the optical fiber tray 7 along the longitudinal direction of the closure 1 (the direction in which the optical fiber cable is laid).

  As shown in FIG. 1B, the optical fiber tray 7 is a part in which the connecting portion 19 between the optical fibers 17 and the extra length portion 21 are accommodated. The surplus length portion 21 is an extra length of the optical fiber 17 required for handling the optical fiber to the connection device, cutting operation, and other operations when the connection portion 19 is formed.

  The cable holding unit 9 and the optical fiber tray 7 are covered with the cover 3. That is, the optical fiber cable 11 and the support line 15 are inserted through the closure (cover 3). The cover 3 is, for example, a resin member that can be opened and closed. In the closed state, the cover 3 is fixed so as to cover the cable holding unit 9 and the optical fiber tray 7, but can be removed by opening the cover 3. That is, the cover 3 is removed during the connection work or the like inside the closure 1.

  End cover 5 is provided on each end face of closure 1. The end surface cover 5 is for sealing both end surfaces of the cover 3. The end surface cover 5 is formed with a hole through which each cable (such as the optical fiber cable 11 and the support wire 15) passes.

  Fig.2 (a) is an AA arrow directional view of FIG.1 (b), and is a figure which shows the cable holding structure 10 (cable holding part 9). FIG. 2B is an exploded view of the cable holding unit 9. The cable holding part 9 is mainly composed of a pedestal 23, a pressing member 25, and the like.

  The pedestal 23 is a plate-like member fixed to the optical fiber tray 7. The pedestal 23 is erected substantially perpendicular to the optical fiber tray 7. The pedestal 23 is formed with a female thread portion that can be screwed into the bolt 27.

  The pressing member 25 can be attached to the pedestal 23 with a bolt 27, and the distance between the pressing member 25 and the pedestal 23 can be adjusted with the bolt 27. The cable holding unit 9 is formed with a support line holding unit 29 and an optical fiber cable holding unit 31. The support line holding part 29 is a part that holds the support line 15. The optical fiber cable holder 31 is a part that holds the optical fiber cable 11.

  As shown in FIG. 2B, the support line 15 and the optical fiber cable 11 are respectively arranged on the support line holding part 29 and the optical fiber cable holding part 31, and the holding member 25 is attached to the base 23 and the bolt 27 is tightened. Thus, as shown in FIG. 2A, the support wire 15 and the optical fiber cable 11 can be sandwiched and held between the base 23 and the pressing member 25. That is, the supporting wire 15 and the optical fiber cable 11 can be held together by the single pressing member 25 at a position that is very close.

  Next, the shapes of the support wire holding part 29 and the optical fiber cable holding part 31 will be described. 3A is a cross-sectional view showing the support wire 15, FIG. 3B is a cross-sectional view showing the optical fiber cable 11, and FIG. 3C is a cross-sectional view showing the holding member 25.

  As shown in FIG. 3A, the outer diameter of the support wire 15 is d1, and as shown in FIG. 3B, the outer diameter of the optical fiber cable 11 is d2. Usually, the outer diameter d2 of the optical fiber cable 11 is larger than the outer diameter d1 of the support wire 15.

  A concave portion 25 a is formed on the holding side of the support line 15 at a portion of the pressing member 25 corresponding to the support line holding portion 29. Similarly, a recess 31 a is formed on the holding side of the optical fiber cable 11 at a portion of the pressing member 25 corresponding to the optical fiber cable holding portion 31. The concave depth of the concave portion 31a is deeper than the concave depth of the concave portion 25a. The depth of the concave portion 25a and the depth of the concave portion 31a correspond to the outer diameters of the support line 15 and the optical fiber cable 31 to be held, and the holding member 25 with respect to the pedestal 23 with each cable held. It is desirable to be fixed almost straight. That is, the depth of the recess 31a is set deeper by (d2-d1) than the recess 25a.

  The curvature radius r <b> 1 of the recess 25 a is larger than ½ of the outer diameter of the support wire 15. Further, the radius of curvature r2 of the recess 31a is larger than ½ of the outer diameter of the optical fiber cable 11. Therefore, the cables can be reliably held even for cables larger than the set outer diameter due to variations in the outer diameters of the respective cables (support line 15 and optical fiber cable 11).

  FIG. 4 is a front view showing a state in which the support wire 15 and the optical fiber cable 11 are held by the cable holding unit 9. As described above, in the closure 1 according to the present invention, the support wire 15 is securely held substantially straight by the pair of cable holding portions 9. Further, the cable holding portion 9 is fixed in the vicinity of both end portions of the optical fiber tray 7. Accordingly, a substantially rectangular frame structure 35 is formed by the optical fiber tray 7, the cable holding portion 9, and the support wire 15. At this time, the optical fiber cable 11 is formed so as to penetrate the frame structure 35.

  That is, the closure 1 has a small number of parts because the frame structure 35 is formed by components such as the support wire 15, the optical fiber tray 7, and the cable holding portion 9 without providing a special main frame. is there. Further, since the support line 15 is held in the vicinity of the optical fiber cable 11 and accommodated in the closure 1, it is not necessary to separate the support line 15 to the outside of the closure 1 and the workability is good.

  As described above, according to the first embodiment, the frame structure 35 of the closure can be formed with the components of the closure 1 without using a frame member or the like. Further, since the support wire 15 is integrally held by the cable holding member 9 so as to be close to the optical fiber cable 11, the holding work is easy, and the labor for separating the support wire 15 and the optical fiber cable 11 can be reduced.

  Further, each cable can be securely held by the respective concave portions of the support wire holding portion 29 and the optical fiber cable holding portion 31, and at this time, by setting the depth of the concave portion corresponding to the outer diameter of each cable, It can be prevented from being tilted. Also, by making the radius of curvature of each recess larger than the radius of curvature of the outer diameter of the cable to be held, due to variations in the outer diameter of the cable (tolerance), it is possible to handle cables having a larger outer diameter than the set value. be able to.

  Next, another embodiment of the cable holding structure will be described. In the following description, components having the same functions as those of the cable holding structure 10 are denoted by the same reference numerals as those in FIG. Fig.5 (a) is a figure which shows the cable holding structure 10a. In the cable holding structure 10a, the support wire 15 and the optical fiber cable 11 are held by the cable holding portion 9a. The cable holding portion 9 a is substantially the same as the cable holding portion 9, but differs in that a bent portion 37 is formed at the end of the base 23.

  The bent portion 37 is a portion formed by being bent toward the holding member 25 side substantially perpendicular to the standing direction of the pedestal 23. That is, the pedestal 23 is formed in a substantially U-shape, and the pressing member 25 is attached and fixed from the U-shaped opening side. Accordingly, the support line 15 and the like are more reliably held by the bent portion 37 and are not detached from the holding portion.

  The bent portions 37 and the pressing member 25 can reduce the depths of the concave portions of the support line holding portion 29 and the optical fiber cable holding portion 31. Further, even when applied to the support wires 15 and the optical fiber cables 11 having different outer diameters (different sizes), the respective cables are not detached and can be reliably held. In other words, the applicable cable size range can be set by the length of the bent portion 37, and cable disconnection at this time can be prevented.

  In the above description, the concave portions in the support wire holding portion 29 and the optical fiber cable holding portion 31 are provided on the pressing member 25 side, but they may be formed on the pedestal 23 side or both.

  For example, FIG.5 (b) is a figure which shows the cable holding structure 10b using the cable holding part 9b which formed the recessed part in the base 23 side. In the example shown in the figure, the support line holding portion 29 is formed with a recess only on the pedestal 23 side, and the optical fiber cable holding portion 31 is formed with a recess on both the pedestal 23 and the pressing member 25. That is, the concave portion in each cable holding portion may be formed in at least one of the base and the pressing member.

  Moreover, as shown in FIG. 6, you may hold | maintain the branch cable 41 collectively. FIG. 6 is a diagram showing a cable holding structure 10 c using a cable holding portion 9 c having a branch cable holding portion 39. In the cable holding part 9 c, a branch cable holding part 39 capable of holding at least one branch cable 41 is formed below the optical fiber cable holding part 31. The branch cable holding unit 39 has substantially the same configuration as the optical fiber cable holding unit 31.

  In addition, the branch cable 41 may be added later in the rear branch in addition to the case where the branch cable 41 is provided from the beginning. In this case, if the bolt 27 is between the support line holding part 29 and the optical fiber cable holding part 31, the support line 15 and the optical fiber cable 11 can be reliably held even without the branch cable 41.

  Further, the pressing member 25 may be divided into two parts, and the pressing member for pressing the support wire 15 and the optical fiber cable 11 and the pressing member for pressing only the branch cable 41 may be configured separately and fixed to the base. .

  When the branch cable 41 is held integrally, a cable holding structure 10d having a cable holding portion 9d as shown in FIG. 7 may be used. In the cable holding part 9d, an arm part 43 and a protrusion part 45 are formed on a branch cable holding part 39 for holding the branch cable 41.

  The arm portion 23 has a plate shape and is erected on the pedestal 23 of the branch cable holding portion 39 so that the respective plate surfaces face each other. The arm portions 43 are provided such that the plate surfaces are parallel to each other, and the width direction of the arm portions 43 corresponds to the cable laying direction. A protrusion 45 is formed near the tip of the arm 43. The protrusion 45 has a blade-shaped (sharp) tip, and projects in a direction substantially perpendicular to the laying direction of the branch cable 41 to be laid. When the branch cable 41 is pushed in between a pair of adjacent arm portions 43, the protrusion 45 holds the branch cable 41 so as to bite into the sheath of the branch cable 41.

  The protruding portion 45 is formed only within a predetermined range from the end portion of the arm portion 43 (the right end portion in the figure and the cable insertion side end portion). That is, there is a range where the protrusion 45 is not formed from the base of the arm 43 (the left end of the arm in the figure) to the end of the protrusion 45 (the left end). Here, the interval between the arm portions 43 is slightly wider than the outer diameter of the branch cable 41 to be inserted. Further, the interval between the protrusions 45 is slightly narrower than the outer diameter of the branch cable 41. Therefore, when the branch cable 41 is inserted between the protrusions 45, the branch cable 41 is inserted with a slight deformation. At this time, a taper shape is formed on the insertion side of the branch cable 41 in the protrusion 45 so that the interval between the protrusions 45 facing each other gradually increases toward the insertion-side end. For this reason, the insertability of the branch cable 41 is excellent.

  Since the length of the arm portion 43 is longer than the outer diameter of the branch cable 41, the branch cable 41 is completely pushed between the arm portions 43. At this time, the length from the base of the arm 43 to the end of the protrusion 45 (the end opposite to the insertion side) is longer than ½ of the outer diameter of the branch cable 41. That is, the length to the protrusion 45 is larger than the radius of the branch cable 41.

  Note that the protrusion margin of the protrusion 45 is desirably equal to or less than the sheath thickness of the branch cable 41. This is because when the branch cable 41 is inserted, there is a risk of damaging the internal optical fiber core or the like. Further, in a state where the branch cable 41 is completely pushed to the base of the base, if the end portion of the protrusion 45 is bitten into the sheath of the branch cable 41, the force in the axial direction of the branch cable 41 is more A large holding force can be obtained.

  According to the cable holding portion 9d, the branch cable 41 can be easily held, and even when the branch cable 41 is provided by rear branching, it is not necessary to remove the pressing member 25 and each cable can be securely held. Since the respective holding portions are integrally formed, a small closure can be obtained.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Closion 3 ......... Cover 5 ......... End surface cover 7 ......... Optical fiber trays 9, 9a, 9b, 9c, 9d ......... Cable holding parts 10, 10a, 10c, 10d ......... Cable holding Structure 11 ......... Optical fiber cable 15 ......... Support line 17 ... ... Optical fiber 19 ... ... Connection part 21 ... ... Extra length part 23 ... ... Base 25 ... ... Holding member 25a ... ... Recess 27 ......... Bolt 29 ... ... Support wire holding part 31 ... ... Optical fiber cable holding part 31a ... ... Recess 35 ... ... Frame structure 37 ... ... Bending part 39 ... ... Branch cable holding part 41 ... ... Branch cable 43 ......... Arms 45 ......... Protrusions

Claims (4)

A closure used for a connection part of an optical fiber cable,
A cable holder for holding the cable;
An optical fiber tray capable of storing the connection portion of the optical fiber cable;
A cover that covers the optical fiber tray and the cable holder;
Comprising
The cable holding portion is integrally formed to be able to hold a support line and an optical fiber cable,
The integrated cable holders are provided in pairs near both ends of the closure, and are connected to each other along the laying direction of the optical fiber cable,
The cable holding part is composed of a pedestal part and a pressing member,
The pedestal portion and / or the pressing member are formed with a support wire holding portion for holding a support wire and an optical fiber cable holding portion for holding an optical fiber cable, and the support wire and the optical fiber cable are connected to each other. By sandwiching the support line and the optical fiber cable between the pedestal part and the pressing member in a state of being arranged in the support line holding part and the optical fiber cable holding part, respectively, the support line and the optical fiber cable Is retained,
The support line holding part and the optical fiber cable holding part are recesses formed in at least one of the pedestal part or the pressing member,
The depth of the concave portion in the support line holding portion is shallower than the depth of the concave portion in the optical fiber cable holding portion,
The optical fiber closure, wherein the cable holding portion and the optical fiber tray can be accommodated in the cover.   The pair of cable holding portions are connected by the optical fiber tray, and the cable holding portion is fixed by the support line between the pair of cable holding portions and the optical fiber tray. Item 10. An optical fiber closure according to Item 1. A holding structure for a support line and an optical fiber cable in a closure used for a connection part of an optical fiber cable,
A cable holding portion configured to include a pedestal portion and a pressing member and hold a cable;
An optical fiber tray capable of storing the connection portion of the optical fiber cable;
A cover that covers the optical fiber tray and the cable holder;
Comprising
The cable holding portions are integrally formed so as to be able to hold a support line and an optical fiber cable, and a pair of the integrated cable holding portions is provided in the vicinity of both end portions of the closure. Connected to each other along the fiber cable laying direction,
The pedestal part and / or the pressing member are formed with a support line holding part for holding a support line and an optical fiber cable holding part for holding an optical fiber cable,
The support line and the optical fiber cable respectively disposed in the support line holding part and the optical fiber cable holding part are sandwiched and held between the pedestal part and the pressing member,
The support line holding portion and the optical fiber cable holding portion are arc-shaped concave portions formed in at least one of the pedestal portion or the pressing member,
A support having a radius of curvature of the recess in the support line holding portion larger than a radius of the support line, and a radius of curvature of the recess in the optical fiber cable holding portion being larger than a radius of the optical fiber cable. Wire and fiber optic cable retention structure.   4. The holding structure for supporting wires and optical fiber cables according to claim 3, wherein the cable holding part is formed integrally with a branch cable holding part capable of holding a branch cable.

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