JPH0980254A - Closure for cable connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive structure which prevents a cable connection part storage body from deforming, increases safety and airtightness, and greatly improves assembling operability. SOLUTION: One axial side of a sleeve 1 is formed at the flange 10 of a thick part having abutting join surfaces which are divided along the length, a recessed groove 6 where a gasket 7 is fitted and clamped is formed in the join surface along the length, and a clamper 12 which is engaged with and disengaged from the flange 10 is arranged; and a metallic coupler 8 provided with a metallic cable gripper 4, made of a band for attachment and detachment, a metallic tension member gripper 5, and a core protection tube fixation member 9 is fixed and mounted on the end surface plate 2 in the sleeve 1. Consequently, the join surface of the sleeve can easily be clamped in an abutting state with the clamper and coating storing operation for the cable connection part can be performed very quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closure for protecting a connecting portion of a communication cable such as an optical cable, and more particularly to an improvement of a closure for an optical cable.

[0002] Generally, a cable connection closure comprises an end face plate that penetrates the cables on both sides of the cable connection part and is attached to it, and a vertically-separated cylindrical sleeve that covers and accommodates the connection part. A structure is often used in which a sleeve is mounted between the sleeves, and the divided butted portions facing each other are connected and integrated by a fixing means such as a bolt or a band to hermetically protect the cable connecting portion.

[0003] In the conventional cable connection housing, the components of the sleeve must be tightly coupled to each other and the cable end and the cable end must be kept rigid to prevent deformation of the sleeve and to prevent ingress of moisture. The connection between them must also be tight, the cable housing provided with the airtight material is complicated to manufacture, expensive and costly, and there is also a problem in terms of durability,
There was a problem that management of tightening force and assembly workability became complicated to ensure airtightness. The present invention is intended to eliminate these conventional drawbacks, prevents deformation of the housing of the cable connection portion, and enhances safety and airtightness, and
It is an object of the present invention to provide a cable connection closure that can significantly improve the assembly workability in a simple and inexpensive form.

[0004]

According to the present invention, an end face plate is provided at both ends of a cylindrical sleeve which covers the circumference of a cable connecting portion and is divided in the axial direction, and which penetrates cables on both sides of the cable connecting portion. In a closure in which abutting portions of the split sleeve that face each other are connected and integrated by a fixing means, one side in the axial direction of the sleeve is formed into a thick inner flange having a butt joint surface divided in the longitudinal direction, A cable holding metal fitting having a groove on the joint surface along which the gasket can be fitted and held along the length direction, a fastener that is engaged with and disengaged from the flange is provided, and a detachable band is formed on the end face plate in the sleeve. And a tension member holding metal fitting and a core wire protection tube fixing member are fixedly installed.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION After connecting a cable to a tension member holding metal fitting within a sleeve, the outer circumference of the cable is polished in the circumferential direction and an airtight tape is wound around or a spacer is inserted and then the cable holding metal fitting is attached. And tighten the mounting bolts evenly. Then, the end plate gasket is wound around the outer periphery of the end plate so that the seam of the end plate gasket comes to the center of the protrusion of the end plate, and the seam is made to fit. Then press the end plate against the lower sleeve and insert the gasket into the gasket groove to fit the end plate gasket, cover the upper sleeve, press the sleeves together and tighten the fasteners in order from the center to the outside. Then, it is fastened several times with a predetermined torque and assembled by re-tightening each bolt, the mounting posture of the cable seal material and the end plate is stable and strong, and the sealing property is greatly improved, and it is injected from the valve. It is safely used as a closure by gas.

[0006]

EXAMPLES The present invention will be described with reference to the examples of FIGS.
The trunk optical fiber cable 3 is penetrated into the cylindrical sleeve 1 and fixed by the cable gripping metal fitting 4.
The tension member is connected and connected to the tension member holding metal fitting 5. The split sleeve 1 is a cylindrical housing, one side of which can be split by a separate joint surface along the axial direction and which can be expanded in the radial direction.
For example, a sleeve gasket groove 6 is provided opposite to a pair of butt joint surfaces formed of PP resin or flame-retardant FRPP and separated along the longitudinal direction of the sleeve, and the sleeve gasket 7 is fitted in the groove 6. A flange 10 formed on the joint surface and formed in a thick portion, and a fastener 12 having a tightening screw 11 is detachably attached to the flange 10 at an appropriate interval to provide a sealing property on a separation surface. The height is increased so that they can be connected.

As the fastener 12, a pair of locking claws are connected by a tightening screw 11, and the pair of locking claws are brought into contact with and separated from each other by the screw 11, so that the sleeve 1 can be easily attached to and detached from the flanges 10 and 10. However, the sleeve 1 may be attached and detached by a band around which the sleeve 1 is wound by connecting both ends with tightening screws. The sleeve 1 may be vertically separable, but in any case, one of the sleeves, for example, a lower sleeve, is provided with the cable gripping metal 4
, And the tension member holding metal fitting 5 are fixedly arranged by the connecting metal fitting 8 together with the core wire protection tube fixing member 9, and the end face plates 2 and 2 having the end face sealing materials 13 at both ends are fitted and arranged.

The end plates 2 are made of FRPP resin in the shape of a semi-disk, and a pair of disks are formed so as to be fixed so as to face both ends of the sleeve 1. in this case,
A cylindrical portion is provided so as to project on the inner surface side of the end face plate 2 and a ring-shaped stepped portion is formed on the outer peripheral side thereof so that the sleeve end edge is fitted therein. It is also effective to secure the adhesiveness by adopting a form of fitting on the inner peripheral side of the portion. The split joint surface has a flange portion 21 in which one or a few cable insertion recesses 20 are formed, and a pair of bolts are provided with a sealing tape 22 interposed on the joint surface including the insertion recess 20. It is configured to be fastened by 23, the cable insertion hole is penetrated into the inside and outside of the closure, and further, the sealing material 24 for maintaining airtightness is fitted to the outer periphery of the end face plate 2 along the circumferential direction. The seal function can be maintained for a long time. As the sealing material 24, one having a length that goes around the end face plates 2 and 2 which are circular plates is used.

It should be noted that the through holes formed by the cable insertion recesses 20 and 20 are wrapped with a spacer 25 made of rubber or airtight tape so that the outer peripheral surface of the cable 3 can be adhered. There is.

Further, connecting fittings 8 are fixed to the inner surface of the end plate 2 on the lower sleeve side of the end plate 2, and cable gripping fittings 4 are attached to both ends of the connecting fittings 8 with a mounting plate 4 ₁ and a tension member. successively attaching the end fitting 5 with fixing pieces 5 _1, accommodating mounting bracket 15 to the central portion of the pair of rings 14 and 14
The core wire protection tube fixing member 9 can be provided so that the core wire 3 ₁ can be distributed and guided and connected. (Figs. 10 and 11)

Furthermore, as the cable clamping hardware 4, bracket as 1 with cable insertion recess 16 ₁ as shown in FIG. 7
6, a band having a curved portion or a pressing piece is provided, and the cable 3 is clamped by being screwed with a screw 19 or, as shown in FIG. 12, a cable insertion recess 16 ₁ is provided. A curved arm 17 along the outer circumference of the cable is rotatably provided on the tool 16 by a pivot 18, and is opened / closed so that the cable 3 is held and fixed by a screw 19 so that the cable can be easily gripped.

The sleeve 1 or the end plate 2 is provided with a gas inlet port 27 having a valve 26, and the gas inlet port 2 is provided.
A sealing gas is injected from 7 to ensure the protection of the connection part.

When assembling the connection portion having such a structure, a spacer 25 is inserted into each cable 3 or a cable sealing material is wound around, and the end face plates 2 and 2 are attached in a pinched state from above, and the end of the cable 3 is also attached. After fixing the outer skin of the section with the cable grip 4, the end plates 2 and 2
The connecting surfaces of the fringes 10 and 10 of the sleeve 1 are butted to the outer peripheral portion of the flange 1 via the end plate sealing material 24, and the flange 1
The fasteners 12 are engaged with each other in 0 and 10, and the screws 11 are tightened and fixed. The fasteners 12 are sequentially attached at predetermined intervals, and the tightening is repeated to make the sleeve 1 airtight over the entire length. The maintenance can be made strong and the sealing structure can be highly reliable. In this assembled state, since the sleeve gasket 7 is compressed in the radial direction between the vertically joined surfaces, high airtightness can be maintained with a relatively small holding force, and the end face plate 2,
A spacer 25 is interposed between the cable 2 and the cable 3 in the cable length direction, and there is an end face plate sealing material 24.
The posture of No. 2 is stable, the assembling is facilitated, and the airtightness can be remarkably improved.

On the other hand, when the sleeve is released from the fastening state, the bolt 11 of the fastening tool 12 is loosened and the fastening tool 12 is released.
The cable 3 can be easily replaced by removing the bolts from the flanges 10 and 10 to expand and separate the joint surface of the sleeve 1 and, if necessary, remove and divide the bolts 23 of the end face plates 2 and 2.

In the example shown in FIG. 13, a tightening band 12 ₁ is used as the fastener 12 instead of the locking claw, and the fastener 12 is wound around the outer circumference of the sleeve 1 and fixed by a fastening screw 11 _1. is there. Ribs 1 ₁ projecting ribs 1 ₁ in the outer periphery of the case sleeve 1, 1 band 1 into the groove between ₁
2 ₁ is wound to help prevent misalignment, and the sleeve 1 is provided with a gas inlet 27 having a valve 26.

[0016]

According to the present invention, an end face plate that penetrates the cables on both sides of the cable connecting portion is provided at both ends of a cylindrical sleeve that covers the circumference of the cable connecting portion and is divided in the axial direction. In a closure in which the mutually facing butted portions are connected and integrated by a fixing means, one side in the axial direction of the sleeve is formed into a flange of a thick portion having a butted joint surface divided along the longitudinal direction,
A cable grip consisting of a detachable band is provided on the end face plate in the sleeve, with a groove along the length direction in which a gasket can be fitted and held on the joint surface, and a fastener that is engaged with and disengaged from the flange. By fixing the connecting metal fittings, which include the metal fittings, the tension member gripping metal fittings, and the core wire protection tube fixing member, it is easy to butt the joint surfaces of the sleeves and tighten them with fasteners. It can be performed remarkably quickly, and it is possible to secure reliable sealing by uniformly pressing the entire circumference of the sleeve with a few tightening points, and the end plate mounting posture is stable and easy to handle, facilitating assembly work. It is also easy and safe to connect and secure with a cable gripping tool, and the cable connection closure has a simple and durable structure. It can be in such form.

[Brief description of drawings]

FIG. 1 is a perspective view of a use state in which a part is cut away to show the inside according to an embodiment of the present invention.

FIG. 2 is a partially cut side view taken along line AA of FIG.

FIG. 3 is a partially cut plan view taken along line BB of FIG.

4 is a sectional front view taken along the line CC of FIG.

FIG. 5 is a front view seen from the outside of FIG.

FIG. 6 is a vertical cross-sectional view in which a sleeve is fastened and the inside is omitted.

7 is a sectional front view taken along the line D-D in FIG.

8 is a cut front view taken along the line EE of FIG.

9 is a cut front view taken along line FF of FIG.

FIG. 10 is a plan view of a connecting fitting showing a connected state of a cable grip fitting and the like.

11 is a side view of the example of FIG.

FIG. 12 is a front view of another embodiment of the cable grip fitting in a usage state.

FIG. 13 is a partial cutaway side view of another embodiment of the fastener in use.

[Explanation of symbols]

1 Sleeve 2 End Face Plate 3 Cable 4 Cable Grip Metal Fitting 5 Tension Member Grip Metal Fitting 6 Recessed Groove 7 Sleeve Gasket 8 Connection Metal Fitting 9 Core Wire Protective Tube Fixing Member 10 Flange 11 Screw 12 Fastener 13 End Face Sealing Material 14 Ring 15 Storage Mounting Metal Fitting 16 Receiver 16 ₁ Cable insertion recess 17 Detachable band 18 Pivot 19 Screw 20 Cable insertion recess 21 Flange 22 Sealing tape 23 Bolt 25 Spacer 26 Valve 27 Gas injection port

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Noriaki Hayashi 4-35-3 Yoyogi, Shibuya-ku, Tokyo Inside Japan Recom Co., Ltd.

Claims (2)

[Claims] 1. A cylindrical sleeve that covers the circumference of the cable connecting portion and is divided in the axial direction is provided with end plates that penetrate the cables on both sides of the cable connecting portion, and the end sleeves face each other. In a closure in which butt portions are connected and integrated by a fixing means, one side in the axial direction of the sleeve is formed into a flange of a thick portion having a butt joint surface divided along the longitudinal direction, and a gasket is fitted to the joint surface. Provided with a groove that can be held along the length direction, deploying a fastener that is engaged with and disengaged from the flange,
A closure for cable connection, which is fixedly equipped with a connecting metal fitting provided with a cable gripping metal fitting composed of a detachable band, a tension member gripping metal fitting, and a core wire protection tube fixing member in the end plate in the sleeve. 2. The end plate is made up of a pair of semi-circular plates which are disc bodies and are divided into two parts from the center. Cable joining recesses are arranged opposite to each other on their joint surfaces, and flange portions are provided so as to project. 2. The cable connecting closure according to claim 1, wherein the flange portions facing each other with a sealing tape interposed between the joint surfaces are detachably connected with bolts.