JP2001013329A - Anchoring member for optical cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchoring member for an optical cable capable of preventing the generation of twists of the optical cable or two coated high- tensile wires and moreover capable of satisfactorily displaying the light transmitting function of an optical fiber core wire in the area near a bare optical fiber core wire even when the twists are generated in the optical cable owing to various factors in accordance with each working within a junction box. SOLUTION: An anchoring member 1 for an optical cable is composed of the fixing member 2 which is composed of an optical fiber core wire 7a, a high-tensile wire 7b arranged in parallel to the optical fiber core wire 7a and the optical cable 7 integrally coating the optical fiber core wire 7a and the high-tensile wire 7b and which fixes and holds to a fixed position the high-tensile wire 7b exposed outside together with the optical fiber core wire 7a by removing the coating body 7c of the terminal fixing objective part L1 of the optical cable 7 noncircular in cross section, and the guide member (twist preventing spacer) 4 which guides the optical cable 7 in a nonrotational state so that the optical cable 7 is not twisted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining member for an optical cable used in an optical communication line.

[0002]

2. Description of the Related Art For example, when an optical cable 7 shown in FIGS. 12 and 13 is wired in a connection box 5 installed in a drawing area of an optical communication line, it is put in and out of a storage shelf member 6a in the connection box 5. It is fixed and held by a retaining member 1A mounted on a possible plurality of storage trays 6b.

As shown in FIG. 13, the conventional retaining member 1A is peeled off from the two coated tensile wires 7B, 7B which are crotch-shaped in a Y-shape from the optical cable 7 by an extra connection length L1. It has a function of guiding and fixing and holding the tensile strength wires 7b, 7b, which have been peeled and removed from the optical fiber core wire 7a and the covering 7c, in a protected state.

[0004] That is, the retaining member 1A has a state in which the optical fiber core wire 7a is accommodated in the guide groove 200 of the base 2A and extended toward a required position, and the tensile strength wires 7b, 7b are connected to the base 2A. The guide hole 201 is inserted into the guide hole 201 and the guide hole 20 is fixed by a fixing screw 210 (see FIGS. 13 and 14).
1 can be fixedly held.

[0005]

However, the above-mentioned conventional retaining member 1A uses the fixing screws 21 to remove the tensile strength lines 7b, 7b which are stripped from the two coated tensile strength lines 7B, 7B and extend.
In this case, the fixing system is fixed to the guide hole 201 only by the reference numeral 0.

[0006] Here, the optical cable 7 supports a region (the position where the two tensile strength lines 7b, 7b are fixedly held) by the retaining member 1A as a result of various operations in the connection box 5. And twist on the upstream side (see Fig. 15)
Easy to occur.

[0007] Then, the optical fiber core wire 7a is a portion of the two coated tensile wires 7B, 7B exposed to the outside from the Y-shaped cleavage start position O1, and the two coated tensile wires 7B, 7B are twisted.
7B.

Therefore, the optical fiber core 7a is twisted 2
Unnecessary side pressure is applied when the sheet is pinched or abutted by the coated tensile strength lines 7a, 7a, thereby deteriorating the light transmission function.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above circumstances. Optical cable or 2 near the line
An object of the present invention is to provide a retaining member for an optical cable which can prevent the twist of the coated tensile strength wire and can sufficiently exhibit the light transmitting function of the optical fiber.

[0010]

According to the present invention, there is provided a retaining member for an optical cable, comprising: an optical fiber core, a tensile wire arranged parallel to the optical fiber, an optical fiber core, and the tensile wire. Fixing the tensile strength wire exposed to the outside together with the optical fiber core in a fixed position by removing the coating of the end fixing target portion of the optical cable having a non-circular cross section and comprising a coating to cover And a guide member for guiding the optical cable in a non-rotating state so that the optical cable is not twisted.

The retaining member is previously mounted on a plurality of storage trays which can be put in and out of a storage shelf member in a connection box installed in a drawing area of the optical communication line.

Here, the optical cable is subjected to a wiring process (operation for connecting and fixing and holding) to the retaining member mounted on the storage tray.

That is, first, an optical cable is split in a Y-shape from an end to a terminal fixing target portion (excess connection length region) in a Y-shape, and two coated tensile strength lines obtained by dividing the optical cable in a Y-shape from a crotch start position are obtained. Strip the optical fiber core. Also, 2
The two coated tensile strength lines become two tensile strength lines in a state where the coated body from the crotch start position to the tip is peeled off and removed.

Next, an optical cable is inserted through the guide member of the retaining member along the axial direction thereof so that the optical fiber core wire and the two tensile strength wires are not peeled off (the covering member having a non-circular cross-sectional shape). Region) is held and guided in a non-rotating state.

Subsequently, the two tensile strength wires are fixedly held at the fixed position by the fixing member of the retaining member while the optical fiber core wire is held at the fixed position. The optical cable is in a state in which two coated tensile strength lines divided in a Y shape are formed in a region between the guide member and the fixing member of the retaining member.

Therefore, the retaining member of the present invention can hold the optical fiber core and securely fix and hold the two tensile strength wires at a position separated from the optical fiber core by the fixing member. Further, a unique function of guiding the optical cable having a non-circular cross section in a non-rotational state is obtained by the guide member.

For this reason, according to the retaining member of the present invention,
Even if the optical cable is twisted due to various factors, it is possible to prevent the optical cable or the two coated tensile wires from being twisted in a region close to the bare optical fiber core, and to prevent the optical fiber core from being twisted. The light transmission function can be sufficiently exhibited.

[0018]

The fixing member may also serve as a ground terminal. In this case, conduction can be achieved, and unnecessary charges can be quickly released via the ground terminal.

The fixing member includes a hole (referred to as a penetrating state), a hole (referred to as a non-penetrated state), a groove, and the like through which a tensile strength wire can be inserted, and can place the tensile strength wire at a fixed position. Can be used. The number of holes, holes, grooves and the like can be set variously according to the purpose.

The fixing member includes a base and a movable member detachably mounted on the base. The fixing member is fixed and held at a fixed position by clamping or pressing a tensile strength line between the base and the movable member. Can be used.

The base is made of metal, synthetic resin, or the like.

As the movable member, a bolt or a screw member for tightening can be used.

The guide member may have a non-circular cross-sectional shape and a guide hole having a shortest diameter smaller than the longest diameter of the cross section of the optical cable. In this case, the optical cable can be inserted along the longitudinal direction, the rotational movement can be restricted, and the optical cable can be prevented from being twisted. The size and number of the guide holes can be variously set according to the purpose.

The guide member may be made of extruded synthetic resin.

The optical cable may have a cross section in the form of a cocoon having a large cross section at both ends and a narrow width at the upper and lower central portions, and a rectangular cross section of the guide hole may be used. In this case, the optical cable can be inserted into the guide hole of the guide member along the longitudinal direction of the optical cable, the rotation can be restricted, and the optical cable can be prevented from being twisted.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a retaining member for an optical cable according to the present invention will be described with reference to FIGS. A description will be given of a case where the present invention is applied to a case where a plurality of drawer-type storage trays 6b are attached to and used in 6a.

The optical cable 7 shown in FIG. 6 will be described first.

The optical cable 7 includes an optical fiber core 7a,
Two tensile wires 7b, 7b arranged in parallel at symmetrical positions while maintaining a predetermined interval on both sides of the optical fiber core wire 7a;
The cover 7c integrally covers the optical fiber core wire 7a and the tensile strength wires 7b, 7b with a non-circular cross-sectional shape.

The optical fiber core 7a is obtained by coating a glass fiber with an ultraviolet curable resin or the like. The tensile strength wires 7b, 7b are formed of steel or the like.

The cover 7c is made of a vinyl chloride resin or the like and has a cross-sectional shape in which the distance W1 between both ends is large and the width W2 in the upper and lower central portions is narrow. (See FIG. 7) and a horizontally long substantially elliptical shape (see FIG. 7).

The coating 7c is provided on the surface 7 of the coating 7c.
At 0, on the upper surface side and the lower surface side, separation grooves 71 having a V-shaped cross section are provided along the longitudinal direction P at the center in the direction of the width W1 (directly above and immediately below the optical fiber core wire 7a). .

The details of the retaining member 1 of the embodiment will be described below.

The retaining member 1 shown in FIG.
And a protection spacer 3 and a guide member (twist prevention spacer) 4 attached to the fixing member 2 respectively.

The fixing member 2 is connected to each of the storage trays 6b (FIG. 10).
And FIG. 11).
An upper vertical wall portion 2b, a lower vertical wall portion 2c extending vertically upward and downward from one end side of the mounting portion 2a;
b, a plate-like upper mounting portion 2d and a lower mounting portion 2e extending substantially horizontally from the upper end side and the lower end side to the opposite side to the mounting portion 2a, or one of them extends so as to slightly widen the angle.
And

The mounting portion 2a has two screw holes 20 for mounting in each storage tray 6b (see FIG. 1).

The upper vertical wall portion 2b has a plurality of horizontal guide holes 21 facing and communicating with respective guide grooves 3c formed in the protective spacer 3 described later, and a screw vertically penetrating the horizontal guide holes 21. A hole 22 is formed. Screw hole 2
2, a screw 23a for fastening and fixing is screwed into the lower end 23 thereof.
0 and the bottom surface 210 of the horizontal guide hole 21, the tensile strength line 7
b, 7b can be clamped in a parallel position or in an overlapped state, and can be fixedly held.

The upper vertical wall portion 2b and the upper mounting portion 2
A guide slit 24 is formed in d to guide and protect the optical fiber core wire 7a and face a V-shaped guide groove 3d formed on the upper surface of the protection spacer 3.

The mounting portion 2a, the upper vertical wall portion 2b, the lower vertical wall portion 2c, the upper mounting portion 2d, and the lower mounting portion 2e
A substantially inverted U-shaped insertion space 2f is formed. A protection spacer 3 described later is fitted into the space 2f.

The lower mounting portion 2e is longer than the upper mounting portion 2d, and has a guide member (twist prevention spacer) 4 mounted on the upper surface 25 at the distal end thereof, and a locking leg 4c of the guide member 4 on the lower surface 26. The recess 27 is formed to engage the front end locking claw 47.

The lower mounting portion 2e has a screw hole 28 which penetrates in the thickness direction and is screwed with the screw 23b for attaching the ground terminal.
Are formed. The terminal 290 of the ground wire 29 is attached by the screw 23b.

The protection spacers 3 are formed with horizontal holes 3a, 3a, which are formed at predetermined intervals in the horizontal direction through the tensile strength lines 7b, 7b and form four pairs of two pairs, and horizontal holes 3a, 3a. And a groove 3c where the branch grooves 3b and 3b join. The cross sections of the branch groove 3b and the groove 3c are concave.

The guide member 4 is made of extruded synthetic resin, and is thick and horizontally long as shown in FIG. The guide member 4 has four guide holes 4a (see FIGS. 1 and 2) formed at horizontal positions facing the four pairs of horizontal holes 3a of the protective spacer 3, respectively, 47 is provided with a locking leg 4c.

The guide hole 4a has a non-circular cross section and a shortest diameter d2 (see FIGS. 2 and 5) smaller than the longest diameter D1 of the cross section of the optical cable 7. The guide hole 4a is opened by a slit 40 formed above.

The guide member 4 is provided with a plurality of spaces 4d for reducing material costs in parallel with the guide holes 4a.

The guide member 4 is provided on the lower mounting portion 2 of the fixed member 2.
e, the recess 27 on the lower surface 26 side while being placed on the upper surface 25
By engaging the front end locking claw 47 of the locking leg 4c with the lower mounting portion 2e, the lower mounting portion 2e is securely fixed and held.

The retaining member 1 configured as described above is
A plurality of storage trays 6b which are stacked so as to be able to be taken in and out of the connection box 5 installed in the drawing-in area of the optical cable 7 are mounted by mounting screws (not shown) inserted into the screw holes 20, 20 of the mounting portion 2a. You.

Here, the optical cable 7 is connected to a predetermined length at the inside of the connection box 5 installed in the drawing area.

That is, the optical cable 7 is cut along the separating grooves 71, 71 of the cover 7c by the connection length L1 into two substantially symmetrical coated tensile strength lines 7B, 7B in a Y-shape. The fiber core wire 7a is exposed to the outside, and the cover 7c of the terminal fixing target portion is peeled off and removed to expose the two tensile strength wires 7b, 7b to the outside.

The optical fiber core 7a is guided and connected to an optical fiber component (not shown) at the distal end.

Here, for example, as shown in FIGS. 1 to 5, the optical cable 7 is inserted into four guide holes 4 a of the guide member 4 of the guide retaining member 1.

Then, as shown in FIGS. 6 and 7, the optical cable 7 has a cross-sectional shape of the covering 7 c constituting the external shape, as shown in FIGS.
Is a narrow cocoon, and the four guide holes 4a of the guide member 4 are non-circular in cross section and the shortest diameter d2 forms a guide hole smaller than the longest diameter D1 of the cross section of the optical cable 7. Are kept guided in a non-rotating state and do not twist.

In this state, the optical cable 7 is connected to the fixing member 2.
Horizontal holes 3a, 3a of the protective spacer 3e attached to
a, two tensile strength lines 7 in the branch grooves 3b, 3b, and the groove 3c.
b and 7b are inserted and held on the bottom surface 210 of the horizontal guide hole 21 of the fixing member 2. The two tensile strength lines 7b, 7b arranged on the hole bottom surface 210 of the horizontal guide hole 21 are screwed into the screw hole 22 of the upper vertical wall portion 2b by the tightening screw 23a. And is fixedly held.

According to the retaining member 1 of the embodiment, the optical cable 7 has the two tensile wires 7b, 7b connected to the protective spacer 3e.
Is fixed and held by the fixing member 2 in a state where it is inserted and arranged, and at the upstream side, the covering body 7c constituting the external shape is held in a state where it is guided in a non-rotational state by the guide hole 4a of the guide member 4. be able to.

That is, the retaining member 1 is connected to the optical cable 7
And a function of restraining rotation on the upstream side of the tip portion.

As a result, the retaining member 1 of the embodiment is
Even if the optical cable 7 is twisted due to various factors in connection with each operation in the connection box 8, even if the optical fiber 7 is exposed, the bare optical fiber core 7a (the separation groove 7
The optical fiber core wire 7 exposed to the outside at a tearing start position O1 which is cut in a Y-shape as two coated tensile strength lines 7B, 7B having a predetermined length along the lengths 1 and 71 as substantially symmetrical shapes.
The twisting of the two coated tensile wires 7B, 7B can be prevented in a region close to a), and the optical fiber core wire 7a is pinched by the twisting of the coated tensile wires 7B, 7B, and a side pressure is applied to reduce the light transmission function. Can be avoided.

Accordingly, by using the retaining member 1 of the embodiment, the light transmission function of the optical fiber core wire 7a can be normally maintained, and the work can be performed without unnecessarily nervous operation by the worker. Performance can be improved.

[0057]

According to the present invention, there is provided a retaining member for an optical cable, comprising: an optical fiber core wire; a tensile wire arranged in parallel with the optical fiber core wire; and a coating for integrally coating the optical fiber core wire and the tensile strength wire. A fixing member for fixing and holding the tensile strength wire exposed to the outside together with the optical fiber core wire in a fixed position by removing the coating of the terminal fixing target portion of the optical cable having a non-circular cross section and comprising a body; A guide member for guiding the optical cable in a non-rotating state so that the optical cable is not twisted.

A retaining member for an optical cable according to the present invention has the above-described configuration. For this reason, in the state where the optical cable is guided in a non-rotational state by the guide member, the covering is removed in advance at the distal end region [the portion of the cable to be fixed at the terminal (excess connection length region)]. The two tensile strength lines exposed to the outside together with the wires are fixed and held in a state where they are fixed and held in place by the fixing member.

That is, the retaining member has a function of fixing and holding the optical cable at the distal end thereof and a function of restraining the optical cable from rotating upstream of the distal end.

Thus, even if the optical cable is twisted due to various factors due to various operations in the connection box, the retaining member can be used in a region near the bare optical fiber core. A phenomenon that twisting of the two coated tensile wires separated in a Y shape from the optical cable can be prevented, and the optical fiber core wire is pinched by the twisting of the two coated tensile wires, a side pressure is applied and the light transmission function is reduced. Can be avoided.

Therefore, by using the optical cable detent member of the present invention, the light transmission function of the optical fiber core wire can be normally maintained, and the work can be performed without unnecessarily nervous operation by the operator. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a main part of a retaining member of an optical cable according to an embodiment is sectioned and an optical cable is held in a part thereof.

FIG. 2 is a view taken in the direction of the arrow C showing that the optical cable in a cross-sectional state is guided by a retaining member of the optical cable of the embodiment so as not to be twisted and is in a non-rotating state.

FIG. 3 is a sectional view taken along line A1-A2 in FIG. 1;

FIG. 4 is a sectional view taken along line B-A2 in FIG.

FIG. 5 is a schematic perspective view showing a cross section and an exploded view of a part of a retaining member of the optical cable of the embodiment.

FIG. 6 is a schematic perspective view showing one example of use of the optical cable applied to the optical cable detent member of the embodiment.

FIG. 7 is a schematic perspective view showing another example of use of the optical cable applied to the retaining member of the optical cable according to the embodiment.

FIG. 8 is a schematic perspective view showing a state in which the optical cable in FIG. 6 is cut in a Y shape along a separating groove and separated into three, that is, two coated tensile wires and an optical fiber core wire.

FIG. 9 is a schematic plan view showing a connection box that accommodates a retaining member of the optical cable according to the embodiment, which is installed in a drawing area of the optical cable.

FIG. 10 shows a housing shelf member installed inside the connection box in FIG. 9, a drawer-type housing tray composed of a plurality of stages that can be put in and out of the housing shelf member, and a pull-out optical fiber cable of the embodiment attached to the housing tray. The schematic front view which shows a stop member.

FIG. 11 shows a housing shelf member installed inside the connection box in FIG. 9, a plurality of drawer-type housing trays that can be put in and taken out of the housing shelf member, and a pull-out optical fiber cable of the embodiment attached to the housing tray. The schematic side view which shows a stop member.

FIG. 12 is a schematic plan view showing a connection box for accommodating a conventional optical cable retaining member installed in an optical cable lead-in area.

FIG. 13 is an enlarged schematic plan view showing a retaining member of the conventional optical cable in FIG.

FIG. 14 is a sectional view taken along the line AA in FIG. 13;

FIG. 15 is a perspective view showing a state in which an optical fiber core wire is sandwiched between two coated tensile wires at a Y-shaped tearing start position due to a twisting phenomenon of an optical cable that occurs when a conventional optical cable retaining member is used. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Detention member 2 ... Fixing member 2a ...
Plate-shaped mounting portion 2b Upper vertical wall portion 2c Lower vertical wall portion 2d
... upper mounting part 2e ... lower mounting part 2f ... space for fitting and insertion 3 ... protection spacer 3a ... horizontal hole 3b ... branch groove 3c ... groove 4 ... guide member (twist prevention spacer) 4a ... guide hole 4b ... material reduction Space for 4c ...
Locking leg 40 Slit 5 Connection box 6a Storage shelf member 6b Storage tray 7 Optical cable 7B Coated tensile wire 7a Optical fiber core wire 7b Tensile wire 7c
... Coating

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kanaya Oyabe 1300, Kitagaiyama Irikashinda, Oaza, Komaki-shi, Aichi Japan Telecommunications Materials Co., Ltd. 1300 Nippon Telegraph and Telephone Corporation (72) Inventor Akihisa Kajiya 3-1-2, Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Yasuyuki Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nippon Telegraph and Telephone Co., Ltd. (72) Akira Ono 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo F-term within Nippon Telegraph and Telephone Co., Ltd. 2H038 CA32 CA52 CA62

Claims (4)

[Claims] 1. A non-circular cross-sectional shape comprising an optical fiber core wire, a tensile wire disposed parallel to the optical fiber core wire, and a coating body that integrally covers the optical fiber core wire and the tensile strength wire. A fixing member that removes the covering of the terminal fixing target portion of the optical cable and fixes and holds the tensile strength wire exposed to the outside together with the optical fiber core in a fixed position; A detent member for an optical cable, comprising: a guide member for guiding a rotation state. 2. The optical cable restraining member according to claim 1, wherein said fixing member also serves as a ground terminal. 3. The optical cable retaining member according to claim 1, wherein said guide member has a non-circular cross-sectional shape and a guide hole whose shortest diameter is smaller than the longest diameter of the cross section of said optical cable. 4. The optical cable retaining member according to claim 3, wherein the optical cable has a cross section in the form of a cocoon having a large cross section at both ends and a narrow width at the upper and lower central portions, and a cross section of the guide hole is rectangular.