JP4637811B2 - Optical fiber cable branch gripping part and optical fiber cable storage case used in combination with it - Google Patents

Description

  The present invention relates to a multi-core optical cable or a multi-core optical fiber or a multi-core optical core to a multi-core optical core branch (fan-out branch), and an optical core used in combination therewith. The present invention relates to a storage case, and an optical fiber storage case with an optical fiber branching part gripping component that combines the gripping component and the optical fiber storage case.

  When an optical communication line is opened for multiple subscribers in an apartment house, a multi-core optical cable (drop cable) is drawn into the apartment house, and the multi-core optical cable is connected to a small-core optical fiber ( It is usually necessary to branch to a single core wire. Since the branched optical fiber is weak in strength, it is reinforced with a protective tube. However, even if the protective tube is placed, the optical fiber is exposed even though the branch portion is a short section, and it is necessary to reinforce this portion in some form.

  Conventionally, as a means for reinforcing a branch portion from a multi-core optical cable or a multi-core optical core wire to a low-core optical core wire, sealing the branch portion with a resin or the like is known (see Patent Document 1).

  In addition, the optical fiber branching portion and the plurality of optical fibers branched are usually stored in the optical fiber storage case. When a subscriber is generated, a single optical fiber cable wired to the subscriber is connected to the branched optical fiber, and the connecting portion is stored in the storage case (see Patent Document 2).

JP 2001-281509 A JP 2006-98611 A

  The resin-encapsulated fan-out bifurcation part is troublesome to assemble and takes time to assemble, so it can be produced at the factory, but it is difficult to build a multi-core optical cable drawn into an apartment or the like at the construction site. .

  Moreover, since the case which accommodates the conventional optical fiber branch part has many large things and requires a big installation space, it is difficult to ensure an installation space in a small apartment house.

  The object of the present invention is to easily assemble the optical fiber branch at the construction site, and to reliably protect the optical fiber, and to use the optical fiber branch in combination with the grip. An object of the present invention is to provide an optical fiber core storage case, and an optical fiber core storage case with an optical fiber core branching portion gripping component that combines the gripping component and the storage case.

The optical fiber branch part gripping component according to the present invention is:
Optical fiber storage case
With the bottom substrate and the walls erected in parallel on both sides of the bottom substrate, the extra length of the multi-core optical cable or the multi-core optical core branched from the multi-core optical core is stored in a protective tube. An extra length storage part is formed,
A gripping part mounting part for mounting a core part branching part gripping part is provided at three locations of the center part on one end side of the bottom substrate and the corner parts on both sides thereof,
In the region of each gripping component mounting portion of the bottom substrate, a closing plate inserted into the closing plate insertion hole of the optical fiber branch portion gripping component is erected.
Optical fiber cable branching part gripping part that is used by attaching to the gripping part mounting part of this optical fiber cable storage case and grips a branch part from a multi-fiber optical cable or a multi-fiber optical cable to a light-core optical fiber. And
On the bottom plate, one trunk side gripping part that grips the multi-core optical cable before branching or the protection tube containing multi-core optical cores, and three branch side gripping parts that grip the protection tube containing the small core optical cores after branching And are integrally formed,
The three branch side gripping parts include one central gripping part provided in the same direction as the trunk side gripping part, and two side gripping parts provided so as to be obliquely divided on both sides of the central gripping part. Consists of
A position corresponding to the inlet of the central gripping portion of the bottom plate is formed a closed塞板insertion hole, this closing plate insertion hole, the gripping part attached to the optical center line branching part gripping part said optical core housing case When attached to the part, a blocking plate erected on the bottom substrate of the optical fiber storage case is inserted, thereby preventing the protective tube containing the small optical fiber from being pushed into the central gripping part .
It is characterized by this.

  The optical fiber branch portion gripping component according to the present invention is preferably such that a holding core wire mounting portion is formed between the central grip portion and the side grip portion.

The optical fiber storage case according to the present invention is
With the bottom substrate and the walls erected in parallel on both sides of the bottom substrate, the extra length of the multi-core optical cable or the multi-core optical core branched from the multi-core optical core is stored in a protective tube. An extra length storage part is formed,
The central portion of one end of the bottom board and three of the corners on both sides, the gripping component mounting portion is provided for mounting the optical core wire branch section gripping part,
A connector support plate is provided at the intermediate position in the height direction of the wall on the other end side of the bottom substrate so as to straddle both side walls, and is attached to the end of the optical fiber after branching on the connector support plate A connector mounting portion for mounting the connector is provided,
In the region of each gripping component mounting portion of the bottom substrate, a closing plate inserted in the closing plate insertion hole of the gripping component is erected.
It is characterized by this.

  Moreover, the optical fiber storage case with the optical fiber branch portion gripping component according to the present invention is provided with any one of the optical fiber storage cases configured as described above, the optical fiber branch portion. Insert the closure plate into the closure plate insertion hole and insert the locking piece into the engagement piece insertion hole, and the closure plate protruding into the gripping component will enter the entrance of the central gripping part of the gripping component. By blocking, the center gripping part cannot be pushed into the protective tube containing the optical fiber after branching.

  The optical fiber branching part gripping part according to the present invention pushes the multi-core optical cable before branching or the protective tube containing multi-core optical fiber into the trunk side gripping part, and the post-branching optical fiber core containing protection tube into the branch side By simply pushing into the grip portion, it is possible to configure a reinforced optical fiber branch portion. Further, the optical fiber branching part gripping part according to the present invention can be used alone as a part for protecting the optical fiber branching part, or is combined with the optical fiber storage case to introduce the optical fiber storage case. It can also be used as a part that protects the optical core branching portion at the mouth. For this reason, the number of parts can be reduced, and it is not necessary to store the optical fiber branch part in the optical fiber storage case, which is effective for downsizing the optical fiber storage case.

  In addition, since the optical fiber storage case according to the present invention can be attached to the optical fiber branch part gripping component in three directions, the optical fiber branch storage part can be gripped according to the situation of the site where the storage case is installed. The direction in which the components are attached can be selected, and the multi-core optical cable before branching or the protection tube with the multi-core optical fiber can be easily wired. In addition, if a gripping part is attached to the storage case, the branched protection tube with a small optical fiber can not be pushed into the central gripping part of the gripping part. It is distributed to the side gripping part and stored clockwise and counterclockwise, making it easy to secure the allowable bending diameter of the optical fiber and reducing the storage space for the small optical fiber with the connector. The storage case can be downsized.

  FIG. 1 shows an embodiment of the optical fiber branch portion gripping component according to the present invention. This gripping component 11 has a bottom plate 13 shaped like a fan with a handle, and holds a multi-core optical cable or a multi-core optical core-containing protective tube before branching at a portion corresponding to the handle of the bottom plate 13. One trunk side gripping part 15 is formed, and three branch side gripping parts 17A, 17B, and 17C are formed to grip the branched protection tube containing the small-core optical fiber in the fan-shaped part.

  Of the three branch side gripping portions, one gripping portion constitutes a central gripping portion 17A that faces in the same direction as the trunk side gripping portion 15, and the other two gripping portions extend to both sides of the central gripping portion 17A. Side gripping portions 17B and 17C that are divided obliquely are configured. The angle of the side gripping portions 17B and 17C with respect to the central gripping portion 17A is preferably 45 degrees.

  Each gripping part 15, 17 </ b> A to 17 </ b> C has a groove formed by standing a wall on the bottom plate 13, and a rib 19 is formed in the depth direction on the inner surface of the groove. When the multi-core optical cable or the multi-core optical fiber protection tube is pushed into the gripping portion, the rib 19 bites into the optical cable jacket or the optical core protection tube so that the optical cable or the optical core protection tube can be gripped. It has become. Such a gripping part is conventionally known.

  Further, a closing plate insertion hole 21 is formed at a position corresponding to the entrance of the center gripping portion 17 </ b> A of the bottom plate 13. When the gripping component 11 is assembled to an optical fiber cord storage case, which will be described later, the closing plate insertion hole 21 is inserted into the storage case side closing plate and protrudes to the entrance of the central gripping portion 17A. This is to prevent use (to prevent the branched protective tube containing the optical fiber core from being pushed in).

  Further, a locking piece insertion hole 23 is formed at a position corresponding to between the center gripping portion 17A and the side gripping portions 17B and 17C of the bottom plate 13. The latching piece insertion hole 23 is a portion where the latching piece on the storage case side is inserted and the gripping component 11 and the storage case are coupled when the gripping component 11 is assembled to a storage case described later.

  Further, a concave retaining core wire mounting portion 25 is formed between the center gripping portion 17A and the side gripping portions 17B and 17C. The holding core wire mounting unit 25 is a portion that holds a holding core wire that is not connected to a subscriber.

  Further, a line 27 formed by a ridge or a groove is formed on the bottom plate 13 near the inner end portions of the trunk side gripping portion 15 and the side gripping portions 17B and 17C. This line 27 serves as a guideline for determining the position of the end portion of the outer cover of the optical cable or the end portion of the protection tube of the optical core wire pushed into each gripping portion. By restricting the position of the end of the jacket of the optical cable or the end of the protective tube of the optical fiber with the line 27, the optical fiber exposed in the gripping part 11 is bent to a bending diameter smaller than the allowable bending diameter. Can be prevented.

  Further, on both sides of the bottom plate 13, brackets 29 are formed for fixing the gripping part 11 to a wall or the like when the gripping part 11 is used alone.

  The gripping component 11 is covered with a lid (not shown) having the same shape as the bottom plate 13, but when the lid is removed, the optical cable or the protective tube containing the optical fiber is not escaped from the gripping portion. Further, a pop-out preventing piece 31 is provided in the vicinity of the upper edge of each gripping part 15, 17 </ b> A to 17 </ b> C.

  FIG. 2 shows an example of a state in which the optical fiber branch portion is gripped by the gripping component 11 configured as shown in FIG. Reference numeral 1 denotes a multi-core optical cable, 2 denotes a plurality of optical core wires obtained by peeling and exposing the outer sheath 3 of the multi-core optical cable 1, and 4 denotes a protective tube placed on the optical core wire 2. The optical cable 1 is gripped by pushing a portion of the jacket 3 into the trunk side gripping portion 15. Further, the branched optical fiber 2 is gripped by being collectively pushed into the central gripping portion 17A with the protective tube 4 covered. Thus, since the multi-core optical cable 1 before branching is gripped by the trunk side gripping portion 15 and the optical core wire 2 after branching is gripped by the central gripping portion 17A with the protective tube 4 covered, the branching portion There is no possibility that an external force is applied to the optical fiber 2 exposed to the light, and the protection of the branch portion is reliable. Also, since no sealing resin is used, assembly at the construction site is easy.

  In FIG. 2, the case where the optical cable 1 has two cores is shown for simplification, but the optical cable 1 usually has four core fibers, and may have six cores, eight cores, and 16 cores. FIG. 2 shows the case where the branched optical fiber 2 is gripped by the central gripping portion 17A. However, when the optical core wire 2 is gripped by one of the side gripping portions 17A and 17B, or the two side gripping portions 17A and 17B. In some cases, it is distributed and gripped. Moreover, the trunk | side holding | grip part 15 may hold | grip the protection tube containing a multi-core tape core wire instead of a multi-core optical cable.

  FIG. 3 shows an embodiment of the optical fiber storage case according to the present invention. The optical fiber storage case 33 includes a bottom substrate 35 serving as a bottom of the case, and walls 37 erected in parallel on both sides of the bottom substrate 35. The extra length storage part which accommodates the extra length of the small optical fiber core branched from the optical core fiber in the state put in the protective tube is comprised.

  Grip component attachment portions 39A, 39B, and 39C for attaching the above-described optical core branching portion grip component 11 are provided at the central portion on one end side of the bottom substrate 35 and the corner portions on both sides thereof. It is preferable that the gripping component mounting portions 39B and 39C in the corner portion are provided at an angle of 45 degrees with respect to the gripping component mounting portion 39A in the center portion. A support protrusion 41 is erected between the gripping component mounting portion 39A at the center and the gripping component mounting portions 39B and 39C at the corners.

  Further, in the region of the gripping component mounting portions 39A to 39C of the bottom substrate 35, the closing plate 43 inserted into the closing plate insertion hole 21 of the gripping component 11 and the locking inserted into the locking piece insertion hole 23. A piece 45 is erected.

  In addition, a wall 37 on both sides extends to the other end side of the bottom substrate 35, and a connector extends across the walls 37, 37 on both sides at an intermediate position in the height direction of the extended portion of the wall 37. A support plate 47 is provided. Therefore, the bottom substrate 35 and the connector support plate 47 are separated from each other in the height direction of the wall 37, and there is a gap between them so that the protective tube containing the optical fiber can be easily passed. On the connector support plate 47, there are provided four connector mounting portions 49 for mounting connectors attached to the ends of the branched optical core wires.

  Further, on the outer surfaces of the walls 37, 37 on both sides, a bracket 51 for attaching the storage case 33 to the wall or the like, and an elastic fitting portion 53 for attaching the storage case 33 to two vertical support bars on the shelf in multiple stages. Is protruding.

  The storage case 33 is also covered with a lid that extends over the upper edge of the wall 37, but is not shown.

  4A shows a state before assembling the optical fiber branch portion gripping component 11 shown in FIG. 1 and the connector 55 to the storage case 33 configured as described above, and FIG. 4B shows the storage case. A state is shown in which the optical fiber branch portion gripping component 11 is attached to the gripping component attaching portion 39A of 33, and the connector 55 is attached to the connector mounting portion 49. When attaching the gripping component 11 to the gripping component mounting portion 39A, the closing plate 43 is inserted into the closing plate insertion hole 21 and the locking piece 45 is inserted into the locking piece insertion hole 23. After attachment, both sides of the gripping component 11 are supported by the support protrusions 41. Further, since the retaining piece 45 is formed with a retaining projection 57 that is hooked to the gripping component 11 side, the attachment state of the gripping component 11 is stabilized. Further, when the gripping component 11 is attached to the gripping component mounting portion 39A (or 39B, 39C), the closing plate 43 protrudes into the gripping component 11 as shown in FIG. It is impossible to push the branched optical tube containing the protection tube into the gripping portion 17A.

  FIG. 4B shows the case where the gripping component 11 is attached to the gripping component mounting portion 39A at the center, but when the gripping component 11 is attached to the gripping component mounting portion 39B at the corner, FIG. Thus, this storage case 33 can selectively attach the gripping component 11 to any of the three gripping component mounting portions 39A to 39B having different directions.

  Next, the use state of the optical fiber branch portion gripping component 11 and the optical fiber storage case 33 configured as described above will be described with reference to FIGS.

  First, with reference to FIGS. 7A to 7D, a use state of the optical fiber storage case 33 to which the optical fiber branch portion gripping component 11 is attached will be described. Since the optical fiber storage case 33 is for four fibers, the four-fiber optical cable (or the protective tube with a four-fiber ribbon cable) 1 is introduced into the trunk-side grip 15 of the grip part 11.

  (A) branches the four-core optical cable 1 into four optical cores 2 in the gripping component 11, and covers one of the optical cores 2 with the protective tube 4 from one side gripping part 17C. A state in which the connector 55 attached to the tip of the first connector mounting portion 49 closest to the side gripping portion 17C is mounted on the first connector mounting portion 49 after being pulled out into the storage case 33 and having a loop length of one loop clockwise. It is. The remaining three optical fibers 2 are covered with the storage tube 5 and pulled out from the storage core mounting portion 25 into the storage case 33, looped, and stored in the storage case 33. An optical cable to the first subscriber is connected to the connector 55.

  (B) shows a case where the number of subscribers increases to two. In this case, one optical fiber 2 is pulled out from the holding tube 5 and the optical fiber 2 is covered with the protective tube 4 and introduced into the storage case 33 from one side gripping part 17C, and one loop clockwise. After taking the extra length, the connector 55 attached to the tip is attached to the second connector attachment portion 49 adjacent to the first connector attachment portion 49. An optical cable for the second subscriber is connected to the second connector 55.

  (C) shows a case where the number of subscribers is increased to three. In this case, one optical core 2 is pulled out from the holding tube 5, and the protective tube 4 is put on the optical core 2 and this time, it is introduced into the storage case 33 from the other side gripping part 17B and turned counterclockwise. After taking the extra length for one loop, the connector 55 attached to the tip is attached to the third connector attachment portion 49 adjacent to the second connector attachment portion 49. The third connector 55 is connected to an optical cable for the third subscriber.

  (D) shows a case where the number of subscribers increases to four. In this case, the remaining one optical fiber 2 is pulled out from the holding tube 5, and the optical fiber 2 is covered with the protective tube 4 and introduced into the storage case 33 from the other side gripping portion 17B. After taking the extra length for one loop, the connector 55 attached to the tip is attached to the fourth connector attachment portion 49 closest to the side gripping portion 17B. An optical cable for the fourth subscriber is connected to the fourth connector 55.

  As described above, the optical fiber storage case 33 to which the optical fiber branch portion gripping component 11 is attached can sequentially cope with an increase in subscribers in a small apartment house or the like. The width of the storage case 33 is limited to a width that allows four connectors 55 to be mounted side by side, but the branched optical core 2 is rotated clockwise and counterclockwise by two by the left and right side gripping portions 17B and 17C. Therefore, there is no possibility that the optical core 2 is forcibly bent to a small bending diameter. Accordingly, the storage case 33 becomes very small and can be installed in an empty space in the switchboard.

  Further, the two side gripping portions 17B and 17C of the branch gripping component 11 are formed at an angle of 45 degrees with respect to the central gripping portion 17A, and the gripping component mounting portions 39B at the two corner portions of the storage case 33 are formed. 39C is also formed at an angle of 45 degrees with respect to the gripping component mounting portion 39A at one central portion, and is thus introduced into the storage case 33 from the two side gripping portions 17B and 17C of the branching gripping component 11. The protective tube 4 with the optical fiber 2 can be smoothly guided clockwise and counterclockwise to form a surplus loop. The example of FIG. 7 is a case where the gripping component 11 is attached to the gripping component mounting portion 39A in the center of the storage case 33, but the same is true when the gripping component 11 is attached to the gripping component mounting portion 39B or 39C at the corner. .

  Further, when the branching part gripping part 11 is attached to any of the gripping part attaching parts 39A to 39C of the storage case 33, the closing plate 43 protrudes from the entrance of the central gripping part 17A of the gripping part 11 (see FIG. 5). Since the gripping part 17A becomes unusable, there is no risk of accidentally pushing the branched protective tube 4 containing the optical fiber 2 into the central gripping part 17A. From this point also, the optical fiber 2 is forced to have a small bending diameter. It can prevent bending.

  By the way, the optical fiber branch portion gripping component 11 can be used alone in addition to the case where it is used by being assembled to the optical fiber storage case 33 as shown in FIG. Examples of use are shown in FIGS. 8 to 10, 59 is a switchboard installed in a small-scale apartment house and the like, and 61 is an electric device already assembled therein. That is, these examples show a case where the optical fiber storage case 33 with the optical fiber branch portion gripping component 11 is installed in an empty space in the switchboard 59.

  8 and 9 show a case where the 8-core optical cable 1 is drawn into the switchboard 59. FIG. Since the optical fiber storage case 33 is for four fibers, in this case, two sets of the optical fiber storage cases 33 with the gripping parts 11 are installed in the switchboard 59. In addition to this, the optical fiber branch portion gripping component 11 is installed alone. The 8-core optical cable 1 is branched into two 4-core ribbons 6 and a protective tube 7 is put on each 4-fiber ribbon 6. In this state, in FIG. 8, the 8-core optical cable 1 is pushed into the trunk side gripping portion 15 of the optical fiber branching portion gripping component 11 installed alone, and the two 4-fiber ribbons 6 are inserted into the central gripping portion 17A. The protective tube 7 is pushed in to complete the first branch. Thereafter, the distal end side of the two four-core ribbons 6 is branched into a single filament, and the tip of the protective tube 7 containing the four-core ribbon 6 is attached to the storage case 33. Is pushed into the trunk-side grip 15. The subsequent processing is the same as in FIG.

  Further, in the example of FIG. 9, since two sets of optical fiber storage cases 33 with the gripping parts 11 are set apart in the switchboard 59, the side gripping parts 17B and 17C of the gripping parts 11 that are installed independently are arranged. The protection tube 7 containing the 4-core tape core wire 6 is pushed in one by one, and the drawing direction of the protection tube 7 containing the 4-core tape core wire 6 is matched with the arrangement of the storage case 33. The rest is the same as the example of FIG.

  FIG. 10 shows a case where one set of storage cases 33 with gripping parts 11 is installed in the switchboard 59 and the four-core optical cable 1 is drawn, but the drawing position of the optical cable 1 and the setting position of the storage case 33 are shifted laterally. Therefore, the gripping part 11 is independently installed at the drawing position of the optical cable 1, and the optical cable 1 is pushed into the trunk side gripping part 15 and the one side gripping part 17C of the gripping part 11 that is installed alone. The wiring can be performed stably without difficulty. That is, in this example, the gripping component 11 is used as a guide component for the optical cable 1.

  As described above, the optical fiber branch portion gripping component 11 can be used in combination with the optical fiber storage case 33, or can be used alone, so that the type of components can be reduced.

1A is a plan view, and FIG. 1B is a perspective view, illustrating an embodiment of an optical fiber branch part gripping component according to the present invention. FIGS. 2A and 2B show a state where an optical fiber branch part is assembled with the optical fiber branch part gripping component of FIG. 1, in which FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view showing an embodiment of an optical fiber storage case according to the present invention, and FIG. (A) is a perspective view which shows the state before assembling | attaching the optical fiber branch part holding | grip part and connector of FIG. 1 to the optical fiber storage case of FIG. 3, (B) is the perspective view after assembling similarly. The perspective view which looked at the state which assembled | attached the optical fiber branch part holding | gripping part of FIG. 1 to the optical fiber storage case of FIG. 3 from the opposite side to FIG. 4 (B). The perspective view which shows the state which assembled | attached the optical core line branch part holding | gripping part of FIG. 1 in the location different from FIG.4 (B) of the optical fiber storage case of FIG. (A)-(C) is a front view which shows the use condition of the optical fiber storage case with an optical fiber branch part holding | grip part which concerns on this invention. The front view which shows an example of the use condition of the optical core line branch part holding | grip part which concerns on this invention, and the optical core line storage case with an optical core line branch part grip part. The front view which similarly shows another example. Similarly, the front view which shows another example.

Explanation of symbols

1: Multi-core optical cable 2: Optical core wire 3: Multi-core optical cable jacket 4: Protection tube 5: Retention tube 6: 4-core tape core wire 7: Protection tube 11: Optical core wire branching part gripping part 13: Bottom plate 15 : Trunk side gripping part 17A: Central gripping part (branch side gripping part)
17B, 17C: Side gripping part (branch side gripping part)
21: Blocking plate insertion hole 23: Locking piece insertion hole 25: Retention core wire mounting branch portion 33: Optical core wire storage case 35: Bottom substrate 37: Wall 39A: Grasping part mounting portion 39B: 39C: Corner portion Gripping component mounting portion 41: support protrusion 43: closing plate 45: locking piece 47: connector support plate 49: connector mounting branching portion 55: connector

Claims (4)

Optical fiber storage case
With the bottom substrate and the walls erected in parallel on both sides of the bottom substrate, the extra length of the multi-core optical cable or the multi-core optical core branched from the multi-core optical core is stored in a protective tube. An extra length storage part is formed,
A gripping part mounting part for mounting a core part branching part gripping part is provided at three locations of the center part on one end side of the bottom substrate and the corner parts on both sides thereof,
In the region of each gripping component mounting portion of the bottom substrate, a closing plate inserted into the closing plate insertion hole of the optical fiber branch portion gripping component is erected.
Optical fiber cable branching part gripping part that is used by attaching to the gripping part mounting part of this optical fiber cable storage case and grips a branch part from a multi-fiber optical cable or a multi-fiber optical cable to a light-core optical fiber. And
On the bottom plate, one trunk side gripping part that grips the multi-core optical cable before branching or the protection tube containing multi-core optical cores, and three branch side gripping parts that grip the protection tube containing the small core optical cores after branching And are integrally formed,
The three branch side gripping parts include one central gripping part provided in the same direction as the trunk side gripping part, and two side gripping parts provided so as to be obliquely divided on both sides of the central gripping part. Consists of
A position corresponding to the inlet of the central gripping portion of the bottom plate is formed a closed塞板insertion hole, this closing plate insertion hole, the gripping part attached to the optical center line branching part gripping part said optical core housing case When attached to the part, a blocking plate erected on the bottom substrate of the optical fiber storage case is inserted, thereby preventing the protective tube containing the small optical fiber from being pushed into the central gripping part .
An optical core branching part gripping part characterized by the above.   The optical fiber cord branching part gripping component according to claim 1, wherein a holding core wire mounting part is formed between the central gripping part and the side gripping part. With the bottom substrate and the walls erected in parallel on both sides of the bottom substrate, the extra length of the multi-core optical cable or the multi-core optical core branched from the multi-core optical core is stored in a protective tube. An extra length storage part is formed,
A gripping component mounting portion for mounting the optical core branching gripping component according to claim 1 or 2 is provided at a central portion on one end side of the bottom substrate and corner portions on both sides thereof,
A connector support plate is provided at the intermediate position in the height direction of the wall on the other end side of the bottom substrate so as to straddle both side walls, and is attached to the end of the optical fiber after branching on the connector support plate A connector mounting portion for mounting the connector is provided,
In the region of each gripping component mounting portion of the bottom substrate, a closing plate inserted in the closing plate insertion hole of the gripping component is erected.
Optical fiber storage case characterized by that.   The optical fiber branch portion gripping component according to claim 1 or 2 is inserted into the closing plate insertion hole into the gripping component mounting portion of any one of the optical core storage cases according to claim 3 and locked. A protective tube containing a light core wire after branching into the central gripping part by attaching a piece inserted into the engaging piece insertion hole and closing the entrance of the central gripping part of the gripping part with a closing plate protruding into the gripping part An optical fiber storage case with optical fiber branch part gripping parts, characterized in that it cannot be pushed in.

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