JP2012053134A - Optical fiber closure and holding structure of branch cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact holding structure of a branch cable having a simple structure and excellent workability, and an optical fiber closure, etc. using the holding structure.SOLUTION: An optical fiber tray 7 includes a branch holding part 10 which is a portion for holding a branch cable 13. The branch holding part 10 is mainly constituted of at least a pair of arm parts 23 and projection parts 25 which are formed in internal surfaces of the arm parts 23 facing with other and mutually project inward. The arm parts 23 are planar shapes and are stood on a pedestal part of the branch holding part 10. The arm parts 23 are provided in parallel to each other, and width directions of the arm parts 23 correspond to a laying direction of the branch cable 13. The projection parts 25 are formed in the vicinities of end parts of the arm parts 23. When the branch cable 13 is pressed in between the pair of arm parts 23 adjacent to each other, the projection parts 25 are capable of holding the branch cable 13 in such a manner to bite into a sheath of the branch cable 13.

Description

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

  Conventionally, an optical fiber closure is used when an optical fiber cable is branched over the air. For example, in the optical fiber closure, the core fibers of the main optical fiber cable and the branch optical fiber cable are drawn out, the ends of each are connected to form a connection portion, and the optical fiber core wire formed at the time of connection work The extra length 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.

  In such an optical fiber closure, the optical fiber cable is gripped by a cable gripping bracket. For example, as shown in Patent Document 1, the optical fiber cable can be held by sandwiching the optical fiber cable between the upper plate and the lower plate and screwing them.

JP 2009-98468 A

  However, the conventional method for holding an optical fiber cable uses screws and bolts, requires a tool for fixing, and needs to provide a space for attaching the bolts and screws. In addition, since a fixing member such as an upper plate or a lower plate is used, the number of parts is increased, and further, it is necessary to form a mounting portion of a screw or a bolt on such a fixing member. .

  On the other hand, a normally used optical fiber cable having a circular cross section requires several hundreds of N or more as a holding force in the longitudinal direction, for example, higher holding force than a flat cable. For this reason, as a cable holding part of such a circular cross-section optical fiber cable, the holding means using a bolt or the like as described above has been applied. However, some branch optical fiber cables may not require a high holding force in the longitudinal direction. In such a case, the holding method as described above has an unnecessary holding force.

  However, in addition to the longitudinal tension, a bending force may be applied to the optical fiber cable. Therefore, there is a need for a small branch optical fiber cable holding structure that does not easily release the holding force against such a force, is simple and excellent in workability.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a compact branch cable holding structure, an optical fiber closure using the same, etc., having a simple structure, excellent workability, and the like. .

  In order to achieve the above-described object, a first invention is a branch cable holding structure in a closure used for a branch part of an optical fiber cable, and is branched with a main line holding part for holding a main fiber optic cable. A branch holding unit that holds the branch optical fiber cable; an optical fiber tray that can store the connection part of the optical fiber cable; and a cover that covers the optical fiber tray, the main line holding unit, and the branch holding unit. The branch holding portion has at least a pair of arm portions that are substantially parallel to each other, and a projection portion that is formed toward the opposing direction of the arm portion, and the projection portion is formed from the tip of the arm portion. A predetermined length is formed in the base portion direction of the arm portion, the branch optical fiber cable is pushed between the arm portions, and the distance between the pair of protrusions is the branch light. The branch optical fiber cable is smaller than the outer diameter of the fiber cable and larger than the core diameter of the branch optical fiber cable obtained by subtracting twice the sheath thickness from the outer diameter of the branch optical fiber cable. In the state where the base portion of the arm portion is completely inserted, the lower portion of the projection portion contacts the sheath of the branch optical fiber cable.

  The protrusions are tapered so that the distance between the protrusions facing each other toward the tips of the arm portions is widened, and the tips of the protrusions in the opposing direction are tapered with a tip angle of 30 to 60 °. The shape is desirable.

  Three or more arm portions may be provided side by side, the protrusions may be formed between the arm portions, and the branch optical fiber cable may be inserted between the arm portions. The branch optical fiber cable may have a substantially circular cross section.

  According to the first aspect of the invention, the branch optical fiber cable is inserted between the pair of protrusions having an interval smaller than the outer diameter of the branch optical fiber cable, so that the branch optical fiber cable is sandwiched and held by the protrusions. The At this time, the branch optical fiber cable is prevented from coming off by the protrusion provided on the distal end side of the arm portion. In particular, if the length from the base of the arm part to the lower end of the protruding part is longer than ½ of the outer diameter of the branched optical fiber cable, it is sure to prevent the branched optical fiber cable completely pushed between the arm parts. Can be prevented from coming off. In addition, the branch optical fiber cable is moved in the axial direction because the lower part of the projection contacts the branch optical fiber cable with the branch optical fiber cable fully inserted between the arms to the base (the lowermost end of the arm). Can be prevented.

  Such holding of the branched optical fiber cable by the arm portion and the protruding portion is particularly effective for the branched optical fiber cable having a substantially circular cross section. For example, even if a bending force or the like is applied to the branched optical fiber cable so that a force is applied in a direction parallel to the arm portion, the protruding optical fiber cable is reliably prevented from coming off. Further, when pushing between the arm portions, the branched optical fiber cable is deformed and securely held between the arm portions.

  Moreover, if it has a taper shape so that the front-end | tip of a projection part may open, it will be easy to insert a branch optical fiber cable between arm parts.

  The arm portion is not easily deformed when the branched optical fiber cable is inserted, and has sufficient rigidity with respect to the branched optical fiber cable. That is, even if a branch optical fiber cable having an outer diameter larger than the interval between the protrusions is inserted between the protrusions, the arm part is hardly deformed and the outer shape of the branch optical fiber cable is deformed (or the tip of the protrusion). Is inserted into the sheath of the branch optical fiber cable).

2nd invention is an optical fiber closure used for a branch part of an optical fiber cable, and a main line holding part holding a main line optical fiber cable, a branch holding part holding a branched optical fiber cable to be branched, An optical fiber tray capable of accommodating the connection portion of the optical fiber cable; and a cover covering the optical fiber tray, the main line holding portion, and the branch holding portion, wherein the branch holding portions are at least substantially parallel to each other. A pair of arms and a protrusion formed toward the opposing direction of the arms, the protrusion being formed with a predetermined length from the tip of the arm toward the base of the arm. ,
(C / 2) <G <{((C / 2) ^ 2)-(D / 2-H) ^ 2} ^ (1/2) + (C / 2)
However, C: the outer diameter of the branched optical fiber cable, D: the distance between the arm portions, G: the height from the base of the arm portion to the lower end of the protruding portion of the protruding portion, and H: the protrusion margin of the protruding portion from the arm portion. An optical fiber closure characterized by the following.

  According to the second aspect of the present invention, it is possible to obtain an optical fiber closure that can easily hold the branch optical fiber cable, has a small number of parts, and can be miniaturized.

  According to the present invention, it is possible to provide a compact branch cable holding structure, an optical fiber closure using the same, etc. with a simple structure and excellent workability.

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 branch holding | maintenance part 10, (a) is the A section enlarged view of FIG.1 (b), (b) is the BB arrow line view of (a). (A) is a figure which shows the holding | maintenance state of the branch cable 13 to the branch holding | maintenance part 10, (b) is the EE arrow line view of (a). The front view which shows the closure 30. FIG. It is a figure which shows the cable holding part 31, and is the JJ sectional view taken on the line of FIG. (A) is a figure which shows the holding | maintenance state of the branch cable 13 to the branch holding | maintenance part 10a, (b) is a KK arrow line view of (a).

  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 main line holding unit 9, a branch holding unit 10, 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 the main cable 11 and the branch cable 13 which are optical fiber cables, and protects the connection portion. The main line cable 11 is supported by a support line 15 outside the closure 1. The support wire 15 is, for example, a steel wire.

  The main line cable 11 and the like are held by a pair of main line holding units 9. The main line holding portions 9 are provided in the vicinity of both end portions of the closure 1. In addition, although the closure 1 shown in the figure shows an example in which the main cable 11 and the support line 15 are held by one cable holding portion 9 for simplicity, they may be held by separate cable holding portions.

  The main line holding unit 9 holds the main line cable 11 by sandwiching the main line cable 11 by fixing the pressing member to the base with a bolt or the like. Since the main line cable 11 is held by the main line holding unit 9, it is possible to prevent tension or the like from being applied to an optical fiber connection unit or the like inside the closure 1.

  The main line holding unit 9 is fixed to the optical fiber tray 7. That is, the pair of main line holding portions 9 are coupled 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 main cable 11 and the branch cable 13 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.

  In the vicinity of both ends of the optical fiber tray 7, a branch holding unit 10 is provided. The branch holding unit 10 is a part that holds the branch cable 13. The branch cable 13 is an optical fiber cable having a substantially circular cross-sectional shape. Details of the branch holding unit 10 will be described later.

  The main line holding unit 9, the branch holding unit 10, and the optical fiber tray 7, which are cable holding units, are covered by the cover 3. The support line 15 may be disposed outside the cover 3. In this case, the holding part of the support wire 15 may be connected to the main line holding part 9 or the like and formed outside the cover 3. That is, at least the main cable 11 may be held as the main line protection unit 9 in the present invention. The cover 3 is, for example, a resin member that can be opened and closed. When the cover 3 is closed, the cover 3 is fixed so as to cover the main line holding unit 9, the branch holding unit 10, and the optical fiber tray 7, but can be removed by opening the cover 3. It is. 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 passes.

  In the example shown in the figure, the optical fiber 17 is taken out from the main cable 11 and connected to the optical fiber 17 of the branch cable 13 to form a connection portion 19. At this time, the branch cable 13 is held by the branch holding unit 10 as described above.

  FIG. 2A is an enlarged view of a portion A in FIG. 1B and shows the branch holding unit 10. Moreover, FIG.2 (b) is a BB arrow line view of Fig.2 (a). The branch holding portion 10 is mainly formed on at least a pair of (four in the figure) arm portions 23 and an inner surface (opposing surface) between the arm portions 23, and projecting portions 25 projecting in directions facing each other. It consists of.

  The arm portion 23 has a plate shape, and is erected on the pedestal portion of the branch holding portion 10 so that the plate surfaces face each other. The arm portion 23 may be provided directly on the optical fiber tray 7. The arm portions 23 are provided so that the plate surfaces are parallel to each other, and the width direction of the arm portions 23 corresponds to the cable laying direction.

  A protrusion 25 is formed in the vicinity of the tip of the arm 23 and at a part (substantially the center) in the width direction. The protruding portion 25 is formed in a tapered shape (the tip is blade-shaped (sharp)) in a direction facing each other, and protrudes in a direction substantially perpendicular to the laying direction of the branch cable 13 to be laid. When the branch cable 13 is pushed between a pair of adjacent arm portions 23, the protruding portion 25 holds the branch cable 13 so as to bite into the sheath of the branch cable 13.

  FIG. 3A is a diagram illustrating details of the arm portion 23 and the projection portion 25. The protruding portion 25 is formed only within a predetermined range from the end portion (upper end portion in the figure) of the arm portion 23. That is, there is a range where the protrusion 25 is not formed by a distance G from the base of the arm 23 (the lower end of the arm in the drawing) to the end (lower end) of the protrusion 25. Here, the interval (length D in the figure) between the arm portions 23 is slightly wider than the outer diameter C of the branch cable 13 to be inserted. The distance (D-2H) between the protrusions 25 is slightly narrower than the outer diameter C of the branch cable 13. That is, D> C> (D-2H). Therefore, when the branch cable 13 is inserted between the protrusions 25, the branch cable 13 is inserted with a slight deformation (or so that the tip of the protrusion 25 bites into the sheath of the cable). At this time, a taper is formed above the protrusion 25 (on the side where the branch cable 13 is inserted) so that the distance between the protrusions 25 facing each other gradually increases (opens) as it goes to the end on the insertion side. A shape is provided. For this reason, the insertability of the branch cable 13 is excellent.

  Since the length (height) (length F in the drawing) of the arm portion 23 is longer than the outer diameter C of the branch cable 13, the branch cable 13 is completely pushed between the arm portions 23. At this time, the protrusion 25 is formed within a predetermined range (F-G in the drawing) from the upper end of the arm 23. The length G from the base portion of the arm portion 23 to the lower end of the projection portion 25 is longer than ½ of the outer diameter of the branch cable 13. That is, the length G to the protrusion 25 is larger than the radius of the branch cable 13.

  In order to avoid damaging the internal optical fiber core or the like when the branch cable 13 is inserted, for example, when the sheath thickness is t, the cable core diameter is (C-2t), but the protrusion 25 It is desirable that the distance (D-2H)> (C-2t). Further, in a state where the branch cable 13 is pushed in, if the lower portion of the projection 25 is in a state of being bitten into the sheath of the branch cable 13, a larger holding force is obtained with respect to the axial force of the branch cable 13. be able to. For this reason, the length G to the lower end of the protrusion 25 is larger than the radius of the branch cable 13, and the protrusion length H of the protrusion 25 is also in a state where the branch cable 13 is completely inserted to the arm base. Therefore, it is desirable to set so as to contact (cut into) the outer jacket of the branch cable 13. That is, (C / 2) <G <{((C / 2) ^ 2)-(D / 2-H) ^ 2} ^ (1/2) + (C / 2).

  As the branch holding portion 10 having such a relationship, for example, when a branch cable of 9 mmφ (sheath thickness t is 1.5 mm) is used, the arm interval D is about 10 mm. The protrusion length H of the protrusion is about 2 mm. In this case, the projection height G is about 5 mm, and the arm height F is about 11 mm. In consideration of the pushing force of the cable and the effect of preventing the cable from being pulled out, it is desirable that the interval between the protrusions 25 be about 2 mm (one side 1 mm) smaller than the cable diameter. This is because if the distance between the protrusions is too narrow with respect to the cable diameter, the pushing force of the cable becomes too strong, and if the distance between the protrusions is too wide with respect to the cable diameter, the cable receiving effect is reduced. In this case, C = D−2H + 2 mm may be set in the above formula.

  FIG.3 (b) is an EE direction arrow line view of Fig.3 (a). The protrusion 25 is formed only at the approximate center of the arm 23. That is, the width of the protruding portion 25 is sufficiently narrow with respect to the arm portion 23. The width of the protruding portion 25 (the length with respect to the cable laying direction) is set as appropriate, but the tip of the protruding portion (the tip in the protruding direction with respect to the arm portion) is sharpened like a blade so as to bite into the sheath portion of the branch cable ( (Tapered shape) is desirable. In addition, as for the front-end | tip angle of the projection part which is a taper shape, about 30-60 degrees is desirable. If the angle is less than 30 °, the protrusion may be damaged when the cable is inserted or when tension is applied to the cable after the cable is inserted. If the angle exceeds 60 °, the protrusion may bite into the cable. This is because the cable becomes weak and the holding power of the cable is reduced. More preferably, the tip angle is about 40 to 45 °. If the angle of the tip of the protrusion is determined, the width of the protrusion (I in the figure) is determined by the protrusion length H of the protrusion and the tip angle. For example, if the tip angle is 40 ° and H is 2 mm, the width I of the protrusion is about 1.4 to 1.5 mm.

  As described above, according to the first embodiment, the branch holding part 10 is configured by the arm part 23 and the protrusion part 25, so that the branch cable 13 can be held with an extremely simple structure. . Note that when the branch cable 13 is pushed between the arm portions 23, the protrusions 25 bite into the outer peripheral portion of the branch cable 13, so that a necessary holding force required for the branch cable 13 can be secured, and an excessive holding force is obtained. Does not occur.

  Moreover, since the taper shape is formed on the insertion portion side of the protrusion 25, the branch cable 13 can be easily inserted. The protrusion 25 is not formed within a predetermined range from the base of the arm 23, and the length from the lower end of the protrusion 25 (the end opposite to the branch cable insertion side) to the base of the arm 23 is a branch cable. Since it is longer than the radius of 13, when the branch cable 13 is completely inserted between the arm portions 23 (when the branch cable 13 is inserted to the base of the arm portion 23), the branch cable 13 is pulled out by the protrusion 25. It is surely prevented. That is, even when a bending force is applied to the branch cable 13 so as to come out from the arm portion 23, the branch cable 13 does not come out from the arm portion 23.

  In particular, by forming three or more arm portions 23 and holding a plurality of branch cables 13 between the respective arm portions, at least the deformation of the arm portion 23 positioned in the middle (the distance D between the arm portions on the distal end side of the arm portion). Since deformation in the direction of leaving) is suppressed, it is possible to more reliably prevent the branch cable 13 from coming off. In addition, if the rigidity of the arm part 23 is sufficiently large with respect to the restoring force in the deformation amount (deformation due to C> D-2H) when the branch cable 13 is inserted, the arm part 23 is not deformed so as to open.

  Next, a second embodiment will be described. FIG. 4 is a front view showing a closure 30 according to the second embodiment. Note that in the following embodiments, the same functions as those of the closure 1 are denoted by the same reference numerals as those in FIG.

  The closure 30 is different from the closure 1 in that a cable holding portion 31 is formed. The cable holding portion 31 holds the main line cable 11 and the branch cable 13 integrally, and the main line holding portion 9 and the branch holding portion 10 in FIG. 1 are integrally formed. In the present embodiment, the example in which the support line 15 is also integrally held has been described. However, the support line 15 may be held by another holding unit or the like outside the closure 30. The pair of cable holding portions 31 are respectively fixed in the vicinity of both end portions of the optical fiber tray 7.

  FIG. 5 is a view showing the cable holding portion 31 and is a cross-sectional view taken along the line JJ of FIG. The cable holding portion 31 includes a pedestal 33, a pressing member 35, and the like. The pedestal 33 is formed with a support wire holding portion 39 that holds the support wire 15, a main wire holding portion 41 that holds the main cable 11, and a branch holding portion 43 that holds the branch cable 13.

  The support wire holding portion 39 is provided with a recess having a slightly larger radius of curvature than the outer diameter of the support wire 15. Similarly, the main line holding part 41 is formed with a concave part having a slightly larger radius of curvature than the outer diameter of the main line cable.

  The holding member 35 is fixed with bolts 37 in a state where the support line 15 and the main line cable 11 are arranged on the support line holding part 39 and the main line holding part 41, respectively. That is, the support wire 15 and the main cable 11 are held by sandwiching the support wire 15 and the main cable 11 between the pressing member 35 and the base 33, respectively.

  A branch holding unit 43 is formed below the support line holding unit 39 and the main line holding unit 41. The branch holding unit 43 has substantially the same configuration as the branch holding unit 10 described above. The branch holding part 43 is formed with a plurality of arm parts 23 (three in the example in the figure) and projections 25, and the branch cables 13 are held vertically. That is, in the example shown in the figure, the support line 15, the main line cable 11, and the branch cable 13 are held so as to be aligned in a substantially straight line.

  The branch cable 13 does not need to be pressed by the pressing member 35 because it does not require a strong holding force in the cable axial direction like the main cable 11 and the support line 15. For this reason, it is excellent in workability, and it is not necessary to remove the pressing member 35 when adding a branch cable.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Further, since the branch cable 13 can be easily held and integrated with the main line holding portion 41 and the like, an extremely small holding portion can be formed.

  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.

  For example, the form of the arm portion 23 is not limited to the example described above. 6A and 6B are diagrams illustrating the branch holding unit 10a, in which FIG. 6A is a plan view and FIG. 6B is a view taken along the line KK in FIG. 6A. The arm portion 23 does not have to be a plate-like member having a predetermined width in the cable laying direction, and may be formed only in the formation range of the protruding portion 25 as shown in FIG. That is, if the rigidity of the arm part 23 is sufficient, the arm part 23 does not need to be a plate-like member. On the other hand, in order to further suppress deformation of the arm 23 (deformation in which the arm interval is widened when the branch cable 13 is inserted), the length of the arm 23 with respect to the direction perpendicular to the laying direction of the branch cable 13. If the (thickness) is increased, the deformation of the arm portion 23 can be further suppressed.

1, 30 ......... Closing 3 ......... Cover 5 ......... End Cover 7 ......... Optical Fiber Tray 9 ......... Main Line Holding Unit 10, 10a ......... Branch Holding Section 11 ......... Main Line Cable 13 ... ... branch cable 15 ... support wire 17 ... optical fiber 19 ... connection part 21 ... extra length part 23 ... arm part 25 ... projection part 31 ... cable holding part 33 ... ... Base 35 ......... Pressing member 37 ......... Bolt 39 ......... Support line holding part 41 ......... Main line holding part 43 ......... Branch holding part

Claims (5)

A structure for holding a branch cable in a closure used for a branch part of an optical fiber cable,
A main wire holding section for holding a main fiber optic cable;
A branch holding unit for holding a branched optical fiber cable to be branched;
An optical fiber tray capable of storing the connection portion of the optical fiber cable;
A cover that covers the optical fiber tray, the main line holding unit, and the branch holding unit;
Comprising
The branch holding portion includes at least a pair of arm portions that are substantially parallel to each other, and a projection portion that is formed on a part of the arm portion in a direction facing each other,
The protrusion is formed with a predetermined length from the tip of the arm to the base of the arm, and the branch optical fiber cable is pushed between the arms.
The distance between the pair of protrusions is smaller than the outer diameter of the branch optical fiber cable, and the core of the branch optical fiber cable is obtained by subtracting twice the sheath thickness from the outer diameter of the branch optical fiber cable. Larger than the diameter,
A holding structure for a branching cable, wherein a lower part of the projection contacts a sheath of the branching optical fiber cable in a state where the branching optical fiber cable is completely inserted to the base of the arm part.   The protrusions are tapered so that the distance between the protrusions facing each other toward the tips of the arm portions is widened, and the tips of the protrusions in the opposing direction are tapered with a tip angle of 30 to 60 °. The branch cable holding structure according to claim 1, wherein the branch cable holding structure has a shape.   Three or more arm portions are provided side by side, the projection portions are formed between the arm portions, and the branch optical fiber cable can be inserted between the arm portions. The branch cable holding structure according to claim 1 or 2.   4. The branch cable holding structure according to claim 1, wherein the branch optical fiber cable has a substantially circular cross section. An optical fiber closure used in a branch portion of an optical fiber cable,
A main wire holding section for holding a main fiber optic cable;
A branch holding unit for holding a branched optical fiber cable to be branched;
An optical fiber tray capable of storing the connection portion of the optical fiber cable;
A cover that covers the optical fiber tray, the main line holding unit, and the branch holding unit;
Comprising
The branch holding portion includes at least a pair of arm portions that are substantially parallel to each other, and a protrusion portion that is formed toward the opposing direction of the arm portions,
The protrusion is formed with a predetermined length from the tip of the arm to the base of the arm,
(C / 2) <G <{((C / 2) ^ 2)-(D / 2-H) ^ 2} ^ (1/2) + (C / 2)
However, C: the outer diameter of the branched optical fiber cable, D: the distance between the arm portions, G: the height from the base portion of the arm portion to the lower end of the protruding portion, and H: the protrusion margin of the protruding portion from the arm portion. Optical fiber closure.

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