JP2003240971A - Fixing fixture for optical cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing fixture for an optical cable capable of preventing a coated optical fiber from damage or the like. <P>SOLUTION: The fixing fixture 6 for the optical cable has the main body section 60 of the fixing fixture. The main body section 60 of the fixing fixture is provided with a pair of leg sections 61a, 61b. The leg sections 61a, 61b at their insides are provided with a holding blade 62 for holding the optical cable 2 by engaging the holding blade in the bundled covering 11 of the optical cable 2. The leg sections 61a, 61b at their outsides are provided with a locking pawl 64 for locking the leg sections 61a, 61b inserted in a hole section 71 with a base plate 7. The main body section 60 of the fixing fixture at its extremity is provided with a holding projecting part 65 for holding a protective tube 80 for protecting the coated optical fiber 3 exposed from the bundled covering 11 of the optical cable 2. The holding projecting part 65 is in the form of a C shape at a cross section having a tube-holding groove 66 for inserting and holding the protective tube 80. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cable fixture provided on an optical closure or the like.

[0002]

2. Description of the Related Art As such an optical cable fixture,
For example, the one described in JP-A-10-133031 is known. In this publication, an optical fiber core wire is passed through a core wire insertion concave groove of a cable fixing member, and two tension member insertion holes are provided on both sides of the core wire insertion concave groove.
It is described that each tension member of the book is inserted, and the tension member is fixed with a screw.

[0003]

However, in the above-mentioned prior art, since the optical fiber core wire remains exposed, the optical fiber core wire is erroneously fixed when the tension member is fixed to the cable fixing metal fitting. It may hurt you.

An object of the present invention is to provide an optical cable fixture capable of preventing damage to the optical fiber core wire.

[0005]

SUMMARY OF THE INVENTION The present invention comprises at least one
An optical cable fixture for fixing an end portion of an optical cable having an optical fiber core of a book to a base portion, a fixture main body portion that holds the end portion of the optical cable, and a tip of the fixture main body portion, And a holding projection for holding a protection tube for protecting the optical fiber core wire exposed from the coating.

In the present invention as described above, when fixing the terminal portion of the optical cable to the base portion, first, the coating of the terminal portion of the optical cable is removed and the optical fiber core wire is taken out. Subsequently, the covering portion of the end portion of the optical cable is held by the fixture main body portion, the optical fiber core wire is inserted into the protective tube, and in this state, the protective tube is held by the holding projection portion. Then, the fixture body is fixed to the base. By thus covering the optical fiber core wire with the protective tube, the optical fiber core wire can be protected. Further, by holding the protective tube on the holding projection, the protective tube does not move. As a result, it is possible to reliably prevent the optical fiber core wire from being damaged in the terminal portion of the optical cable.

[0007] Preferably, the fixture main body portion is a projection portion to be inserted into a hole portion provided in the base portion, a holding blade provided on each projection portion for holding the optical cable by biting into the coating of the optical cable, Each of the protrusions has a locking claw that locks each protrusion inserted into the hole to the base. In such a structure, the holding blade of the fixture main body is made to bite into the coating of the optical cable to hold the optical cable, and in this state, both protrusions of the fixture main body are inserted into the holes of the base. At this time, since both projecting portions of the fixture main body are locked to the base by the locking claws, other parts for fixing the fixture main body to the base are unnecessary. Further, since the holding blade holds the optical cable, it is possible to hold the optical cable in a stable manner.

Further preferably, the holding projection has a tube holding portion for inserting and holding the protective tube through which the optical fiber core wire is inserted. As a result, for example
It is possible to easily hold the small-diameter protection tube, through which the optical fiber core wire of about this length is inserted, on the holding projection.

In this case, preferably, the holding protrusion has a C-shaped cross section. This makes it possible to prevent the protective tube inserted into the tube holding portion from easily coming off the holding projection. Further, by covering the holding projection with a large-diameter protective tube having a large number of optical fiber cores inserted therein, the holding projection can be easily held.

Further, the present invention is an optical cable fixture for fixing a terminal portion of an optical cable having at least one optical fiber core wire and at least one strength member to a base portion, which is exposed from a coating of the optical cable. A fixture main body that holds each tensile strength member, and a holding projection that is provided at the tip of the fixture main body and that holds a protective tube for protecting the optical fiber core exposed from the coating of the optical cable. It is characterized by.

In the present invention as described above, when fixing the end portion of the optical cable to the base portion, first, the coating of the optical cable is removed to take out the optical fiber core wire and the strength member. Next, the strength member is held by the fixture main body, the optical fiber core wire is inserted through the protection tube, and the protection tube is held by the holding projection in this state. Then, for example, the strength member is fixed to the base portion with a screw or the like. By thus covering the optical fiber core wire with the protective tube, the optical fiber core wire can be protected.
Further, by holding the protective tube on the holding projection, the protective tube does not move. As a result, it is possible to reliably prevent the optical fiber core wire from being damaged in the terminal portion of the optical cable.

Preferably, the fixture main body has at least one holding insertion hole for holding each strength member, and a guide portion for passing an optical fiber core wire, and the holding protrusion is It has a tube holding part formed so as to be connected to the guide part and for inserting and holding a protective tube through which the optical fiber core wire is inserted. This makes it possible to easily hold each strength member to the fixture main body,
It is possible to easily hold the small-diameter protection tube, through which about one or two optical fiber cores are inserted, on the holding projection.

In this case, preferably, the holding protrusion has a C-shaped cross section. This makes it possible to prevent the protective tube inserted into the tube holding portion from easily coming off the holding projection. Further, by covering the holding projection with a large-diameter protective tube having a large number of optical fiber cores inserted therein, the holding projection can be easily held.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an optical cable fixture according to the present invention will be described below with reference to the drawings. In the description of the embodiments, the same reference numerals indicate the same elements.

First, a first embodiment of an optical cable fixture according to the present invention will be described with reference to FIGS. Figure 1
FIG. 4 is a cross-sectional view showing a cable connecting portion closure including the optical cable fixture of the present embodiment. In the figure,
The cable connection closure 1 has a housing H that can be opened and closed, and the optical cable 2 is introduced into the housing H from both sides. The optical cable 2 is one in which one optical fiber core wire 3 and two strength members 8 are arranged in parallel and are collectively covered 11 (see FIG. 3). In the housing H, a connection tray 4 for accommodating a fiber connection part that connects the optical fiber core wires 3 of different optical cables 2 is arranged. Wiring guides 5 to which a plurality of optical cable fixtures 6 are mounted are provided on both sides of the connection tray 4.

A perspective view of the wiring guide 5 is shown in FIG.
In the figure, the wiring guide 5 has a main body 10 fixed to the housing H and a base plate 7 attached to the main body 10, and the optical cable fixture 6 is mounted on the base plate 7. The base plate 7 is made of metal such as stainless steel and has a two-step structure bent in a substantially U-shape. In addition, the base plate 7 is formed with a plurality of holes 71 for fixing the optical cable fixture 6 and a hole-shaped grounding portion 9 for inserting the strength member 8 of the optical cable 2, for example.

The optical cable fixture 6 is a member for fixing the terminal portion of the optical cable 2 to the base plate 7. 3 is a perspective view of the optical cable fixture 6, FIG. 4 is a plan view of the optical cable fixture 6, FIG. 5 is a side view of the optical cable fixture 6, and FIG. 6 is a front view of the optical cable fixture 6. is there.

The optical cable fixture 6 has a fixture body 60 for holding the end portion of the optical cable fixture 2, and a pair of fixture body 60 is inserted into the ground portion 71 of the base plate 7. Legs 61a and 61b are provided.

On each inner side surface of the leg portions 61a and 61b, for example, three linear holding blades 62 extending in the longitudinal direction of the leg portions 61a and 61b are provided. This holding blade 62
Is to hold the optical cable 2 stably by biting into the collective coating 11 of the optical cable 2. Holding blade 6
An inclined portion 63 is provided at the tip of the second member. As a result, when the holding blade 62 is bitten into the collective coating 11 of the optical cable 2, the pushing direction of the holding blade 62 with respect to the optical cable 2 is gradually converted to the biting direction of the holding blade 62, and the holding blade 62 is batched. It smoothly cuts into the coating 11. Therefore, the optical cable 2 is attached to the fixture body 60.
Can be easily held.

Locking claws 64 for locking the leg portions 61a, 61b inserted into the holes 71 of the base plate 7 to the base plate 7 are provided on the outer surfaces of the leg portions 61a, 61b.
As a result, the leg portions 61a and 61b do not come off from the hole portion 71, so that other members for preventing the fixture main body portion 60 from coming off the base plate 7 and preventing the optical cable 2 from falling off. Is unnecessary.

At the tip of such a fixture body 60,
A holding projection 65 for holding a protective tube 80 for protecting the optical fiber core wire 3 exposed by removing the collective coating 11 of the optical cable 2 is provided. The holding projection 65 has a C-shaped cross section having a tube holding groove 66. The tube holding groove 66 is for inserting and holding the protective tube 80 having a diameter of about 0.9 mm while allowing the optical fiber core wire 3 to pass therethrough. In this way, by making the holding projection 65 have a C-shaped cross section with an opening of less than 180 °, the protective tube 80 inserted into the tube holding groove 66 can be easily inserted and does not easily come off. The protective tube 80 can be securely held by the holding projection 65.

Further, as shown in FIG. 7, the holding projection 65 has an outer diameter dimension which does not easily come off even when a protection tube 82 having a large diameter of, for example, about 3.5 mm is covered.
In this case, it is effective when using the optical cable 2A having a plurality of optical fiber core wires 3. That is, even if there are a plurality of optical fiber core wires 3 and a protection tube having a large diameter is required, it is possible to protect with the same optical cable fixture.

As the material of the optical cable fixture 6, a plastic such as polyamide (nylon), polyacetal, polypropylene or polycarbonate is used. Further, as the material of the protective tubes 80 and 82,
Tetrafluoroethylene, hexafluoropropylene copolymer, tetrafluoroethylene resin and the like are used.

Optical cable fixture 6 constructed as described above
When the optical cable 2 is fixed to the base plate 7 by means of the above, first, the end portion of the optical cable 2 is torn again in half in the longitudinal direction, the collective coating 11 of the optical cable 2 is removed, and the two strength members 8 and the optical fiber 2 are removed. The fiber core wire 3 is exposed. In this state, the optical cable fixture 6 is arranged so that the optical cable 2 is sandwiched between the leg portions 61a and 61b. And
The holding blade 62 is made to bite into the collective coating 11 of the optical cable 2 to hold the optical cable 2 in the fixture body 60, and for example, the exposed optical fiber core wire 3 is inserted into the tube holding groove 66 of the holding projection 65. insert. After that, the protective tube 80 is inserted into the holding projection 65 while covering the optical fiber core wire 3 from the tip side of the holding projection 65, and the protection tube 80 is held by the holding projection 65.

When the optical cable 2A having a plurality of optical fiber core wires 3 is used, each optical fiber core wire 3 is inserted into the tube holding groove 66 of the holding projection 65 and then inside the protective tube 82. The protective tube 82 is attached to the outer surface of the holding projection 65 so that the holding projection 65 is inserted into
And hold it (see FIG. 7).

Next, the two strength members 8 are inserted into the grounding portions 9 of the base plate 7, respectively. At this time, the strength member 8
Since the strength member 8 is held by the base plate 7 even in the open state, the strength member 8 does not affect the optical fiber core wire 3. Further, the strength member 8 can be grounded. Then, the leg portion 61 of the optical cable fixture 6
Insert a and 61b into the hole 71 of the base plate 7. At this time, the leg portions 6a and 61b are locked by the locking claws 64.
1a and 61b are locked to the base plate 7, and the optical cable 2
Is securely fixed and held in a state of being sandwiched between the fixture body 60 and the base plate 7.

As described above, according to the optical cable fixture 6 of this embodiment, the holding projection 65 is provided at the tip of the fixture body 60 to hold the protective tube 80 for protecting the optical fiber core wire 3. The optical fiber core wire 3 is reliably protected at the terminal portion of the optical cable when the optical cable is fixed to the base plate 7 because it is held by the projecting portion 65. As a result, damage to the optical fiber core wire 3 can be prevented.

Further, since it is not necessary to provide other parts for fixing the fixture main body 60 to the base plate 7, the number of parts can be reduced and the cost can be reduced.

In this embodiment, the holding projection provided at the tip of the fixture body has a C-shaped cross section, but the holding projection has a U-shaped cross section in addition to this. The shape may be a cylindrical shape having a through hole into which the protective tube 80 having a small diameter can be inserted.

The shape of the holding projection is C-shaped in section or U-shaped in section.
In the case of a structure having at least one opening in the periphery such as a letter shape, the optical fiber core wire 3 can be housed in the holding projection from the side, which improves workability.

Further, in the present embodiment, the pair of legs are provided on the fixture main body, but the present invention is not limited to this. For example, one having a protrusion inserted into the hole 71 of the base plate 7 is provided. But good. Further, although the holding blade is configured to be sandwiched between the pair of legs, the present invention is not limited to this. For example, a recess is provided in the fixture main body separately from the legs, and the holding blade is provided on the inner surface thereof. You may form.

Next, a second embodiment of the optical cable fixture according to the present invention will be described with reference to FIGS. In the figure,
The same or equivalent members as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The optical cable fixture of this embodiment is for fixing an optical cable to a base member 90 as shown in FIG. 8 instead of the wiring guide 5 of the first embodiment. The base member 90 has a plurality of insertion holes 91 through which the tensile strength members 8 exposed from the collective coating 11 of the optical cable 2 are inserted.
And a plurality of guide recesses 99 for passing the optical fiber core wires 3 exposed from the collective coating 11 of the optical cable 2. Further, the base member 90 has an insertion hole 9
A thread groove (not shown) that penetrates to 1 is formed,
The tensile strength body inserted in the insertion hole 91 is fixed by the screw 92 screwed into this thread groove.

FIG. 9 shows an optical cable fixture 9 of this embodiment.
It is a perspective view showing 3. In the figure, the optical cable fixture 93 includes two strength members 8 exposed from the optical cable 2.
Has a fixture main body portion 94 for holding. The fixture main body 94 includes a pair of holding insertion holes 95 for holding the two strength members 8 in a separated state, and the optical cable 2.
Guide groove 9 for passing the optical fiber core wire 3 exposed from the
6 and 6. It should be noted that the holding insertion hole 95 may be one, and the two strength members 8 may be inserted together.

At the tip of the fixture body 94 as described above,
A holding protrusion 97 having a shape similar to that of the holding protrusion 65 in the first embodiment is provided. The holding projection 97 has a tube holding groove 66 for inserting and holding the thin protective tube 80, and the tube holding groove 66 is formed so as to be connected to the guide groove 96.

The optical cable fixture 93 configured as described above
When fixing the optical cable 2 to the base member 90 by
First, the optical cable 2 is split again in two in the longitudinal direction, the collective coating 11 of the optical cable 2 is removed, and the two strength members 8 and the optical fiber core wire 3 are exposed. Next, each strength member 8 is inserted into the pair of holding insertion holes 95 of the optical cable fixture 93, and the optical fiber core wire 3 is inserted into the guide groove 96 and the tube holding groove 66.

Next, when the number of the optical fiber core wire 3 is only one, as shown in FIG. 9, the protective tube 80 is covered on the optical fiber core wire 3 from the tip end side of the holding projection 97, and then the tube holding groove 66 is provided. The protective tube 80 is inserted and held by the holding projection 97. When there are a plurality of optical fiber core wires 3, as shown in FIG.
A protection tube 82 having a larger diameter than
Cover.

Thereafter, the two strength members 8 are attached to the base member 9
0 is inserted into one insertion hole 91, and the screw 92 is tightened and fixed. Thereby, the optical cable 2 is securely fixed and held by the base member 90.

Therefore, the optical cable fixture 9 of the present embodiment
Also by 3, the optical fiber core wire 3 is surely protected when the optical cable is fixed to the base member 90, so that the optical fiber core wire 3 can be prevented from being damaged.

In this embodiment, the fixture main body 94 of the optical cable fixture 93 holds only the strength member 8, but in order to make it easier to insert the strength member 8 into the holding insertion hole 95, the holding member 8 is held. A taper portion may be formed on the rear end side (the side through which the tensile strength member 8 is inserted) of the insertion hole 95 for use, and the end portion of the collective coating 11 of the optical cable 2 may be press-fitted and fixed.

Also in this embodiment, the shape of the holding projection is not limited to the C-shaped cross section, but may be a U-shaped cross section or a cylindrical shape having a through hole into which the protective tube can be inserted. Further, the guide portion of the optical fiber core wire 3 formed on the fixture main body 94 is not limited to the groove shape, and may be a through hole.

The preferred embodiment of the optical cable fixture according to the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, the holding protrusion holds one protective tube, but it may have a structure capable of holding a plurality of protective tubes.

Further, in the above embodiment, an example of the optical cable composed of one optical fiber core wire and two tensile strength members was illustrated, but the present invention is not limited to this, and one minimum optical fiber core wire is used. And one strength member is enough.

Further, in the above-mentioned embodiment, when the optical cable 2 having only one optical fiber core wire 3 is used, the protective tube 80 is inserted and held in the tube holding groove of the holding projection, and a plurality of optical fibers are inserted. Optical cable 2 with fiber 3
When A is used, the protective tube 82 is held by covering the holding projection, but if the number of the optical fiber core wires 3 existing in the optical cable 2 is about two or three, the optical fiber core wire 3 is used.
May be inserted into the protective tube 80.

[0045]

According to the present invention, since the holding projection for holding the protective tube for protecting the optical fiber core wire is provided at the tip of the fixture main body for holding the end portion of the optical cable, the strength is improved. It is possible to prevent damage to the weak optical fiber core.

[Brief description of drawings]

FIG. 1 is a diagram showing a cable connection closure including an optical cable fixture according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a wiring guide provided in the cable connecting portion closure shown in FIG.

FIG. 3 is a perspective view showing a state in which an optical cable having one optical fiber core wire is fixed to a base plate by the optical cable fixing tool according to the first embodiment of the present invention.

FIG. 4 is a plan view of the optical cable fixture shown in FIG.

FIG. 5 is a side view of the optical cable fixture shown in FIG.

FIG. 6 is a front view of the optical cable fixture shown in FIG.

7 is a perspective view showing a state in which an optical cable having a plurality of optical fiber cores is fixed to a base plate by the optical cable fixture shown in FIG.

FIG. 8 is a view showing a base member to which an optical cable is fixed by an optical cable fixing tool according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing a state where an optical cable having one optical fiber core is fixed to a base member by an optical cable fixing tool according to a second embodiment of the present invention.

FIG. 10 is a perspective view showing a state where an optical cable having a plurality of optical fiber cores is fixed to a base member by an optical cable fixing tool according to a second embodiment of the present invention.

[Explanation of symbols]

2, 2A ... Optical cable, 3 ... Optical fiber core wire, 6 ... Optical cable fixture, 7 ... Base plate, 8 ... Tensile body, 11 ... Collective coating, 61a, 61b ... Leg part (protruding part), 62 ... Holding blade , 64 ... Locking claws, 65 ... Holding projections, 66 ... Tube holding grooves (tube holding portions), 71a, 71b ... Holes, 80, 82 ... Protective tubes, 90 ... Base member, 9
3 ... Optical cable fixing tool, 94 ... Fixing device main body section, 95 ... Holding insertion hole, 96 ... Guide groove (guide section), 97 ... Holding projection section.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuya Iwamoto             1-226, Higashi 1-226, Komaki City, Aichi Prefecture             Within Denryo Corporation (72) Inventor Tatsuya Ishihara             1-226, Higashi 1-226, Komaki City, Aichi Prefecture             Within Denryo Corporation (72) Inventor Koji Machino             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Masahiro Hashiguchi             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Masafumi Awamori             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 2H038 AA21 CA32 CA36                 5G363 AA07 BA10 DA13 DC08

Claims (7)

[Claims] 1. An optical cable fixture for fixing a terminal part of an optical cable having at least one optical fiber core wire to a base part, a fixture body part for holding the terminal part of the optical cable, and the fixture body. An optical cable fixture, which is provided at a tip of a portion, and which holds a protective tube for holding a protective tube for protecting the optical fiber core wire exposed from the coating of the optical cable. 2. The holding body for holding the optical cable, wherein the fixture main body portion is provided in each of the projection portions, and a projection portion to be inserted into a hole provided in the base portion, and to hold the optical cable by biting into a coating of the optical cable. The optical cable fixing tool according to claim 1, further comprising: a blade and a locking claw that is provided on each of the protrusions and locks each of the protrusions inserted into the hole with the base portion. . 3. The optical cable fixture according to claim 1, wherein the holding projection has a tube holding portion for inserting and holding the protection tube in which the optical fiber core wire is inserted. . 4. The optical cable fixture according to claim 3, wherein the holding projection has a C-shaped cross section. 5. An optical cable fixture for fixing a terminal portion of an optical cable having at least one optical fiber core wire and at least one tensile strength member to a base portion, wherein each tensile strength exposed from a coating of the optical cable. A fixture main body that holds the body, and a holding projection that is provided at the tip of the fixture main body and that holds a protective tube for protecting the optical fiber core exposed from the coating of the optical cable are provided. An optical cable fixture characterized in that 6. The fixture main body portion has at least one holding insertion hole for holding each of the strength members, and a guide portion for passing the optical fiber core wire, and the holding protrusion. 6. The optical cable fixture according to claim 5, wherein the portion has a tube holding portion that is formed so as to be connected to the guide portion and that inserts and holds the protective tube into which the optical fiber core wire is inserted. 7. The optical cable fixture according to claim 6, wherein the holding projection has a C-shaped cross section.