JPH08237850A - Cable sealing material for cable connection closures - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the handling of the set of the cable sealing material in the cable connection housing, improve the safety and airtightness, and significantly improve the assembly workability. A closure formed by forming a butt joint surface that divides the sleeve 1 vertically into two in the axial direction, and connecting and joining the joint surfaces of the divided sleeve, which are opposed to each other, by a fixing means, is attached to the sleeve 1. At least one cable insertion hole 20 is formed in the end face plate 3, a hollow cylindrical spacer is fitted and disposed around the cable led out from the cable insertion hole, and a ring-shaped mountain groove is formed on the inner circumference and the outer circumference of the spacer. By using the cable-seal material that has been formed respectively, it is easy to tightly tighten the cable lead-out portion, the cable lead-out cover accommodating work of the cable connection part can be performed very quickly, and the sleeve has a highly reliable seal. Can be secured.

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 connection portion of a communication cable such as an optical cable, and more particularly to an improvement of a cable sealing material used for a closure for an optical cable.

[0002]

2. Description of the Related Art Generally, a cable connection closure is
An end face plate that penetrates the cables on both sides of the cable connecting part, and a vertically-separated cylindrical sleeve that accommodates the connecting part by covering the connecting part. There is often used a structure in which the divided butted portions opposed to each other are connected and integrated by a fixing means such as a bolt or a band to hermetically protect the cable connecting portion.

Since the sleeve of the housing for protecting the connection portion of the conventional cable must maintain rigidity for preventing deformation of the sleeve and prevent ingress of moisture, the respective components of the sleeve are tightly coupled to each other. In addition, the connection between the cable end and the cable end must be tight, the outer diameter of the cable to be led out is also different, and the set handling is troublesome, and the cable container with the airtight material is complicated to manufacture, expensive and expensive. In other words, there is also a problem in terms of durability, and even if a cable sealing material is used, there is a problem in that tightening force management and assembly workability are complicated in order to ensure airtightness. The present invention is intended to eliminate these conventional drawbacks, and in a cable connection closure, simplifies the derivation of a cable from a sleeve, enhances safety and airtightness, and significantly improves assembly workability. It is intended to provide a sealing material.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a butt joint surface which surrounds a cable connecting portion and axially divides a cylindrical sleeve into which a cable can be led out so as to face each other. In the closure in which the joint surfaces are connected and integrated by a fixing means, a hollow cylindrical spacer is fitted and deployed around the cable led out from the cable insertion hole of the sleeve, and the inner and outer circumferences of the spacer are formed into a ring shape. This is a cable sealing material with mountain grooves.

[0005]

[Operation] Strip the cable jacket to the required length, cut the internal slot rod from the strip, and cut it to the specified size.
Complete the preparation for connecting the cable by making the tension member bare so that the slot member has a predetermined size using a cutter or the like. After circumferentially polishing and cleaning the jacket of the cable at the specified position and inserting the cable spacer, cut out the thin-walled cap and the slanted slit that will become the cable insertion hole of the end plate, and open the slit end. Then, insert the cable and pass through the cable insertion hole, install a seal member with a groove in the slit part, fit a connecting piece to hold the slit closed and cover the slit part of the outer peripheral part of the end face plate. To
Adhere the tape-shaped gasket so that it fits in well. After that, attach the cable grips to the cable jacket using the required spacers, tighten them with the tightening bolts to the prescribed torque, and then use the tension members to tighten the tension member grips with the tightening screws. Tighten with torque. Then, while pressing the end plate against the lower sleeve, adjust it to the end plate gasket, cover it with the upper sleeve, press the sleeves together, and tighten the fasteners in order from the center to the outside. Assembled by tightening in separate steps to stabilize and firmly attach the cable seal material and end plate.
The sealing property is also greatly enhanced, and it is safely used as a closure by the gas injected from the valve.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a cylindrical sleeve 1 shown in FIGS. 1 to 15 and an end face plate 3 fitted to a side fitting portion 2 of the sleeve 1.
An example of the closure including and will be described with reference to FIGS.
As shown in FIG. 2, the trunk optical cable is penetrated through the end plates 3 and 3 and fixed by the cable gripping metal fitting 4, and the tension member of the cable is fixed to the tension member gripping metal fitting 5.
Is connected and connected to. The sleeve 1 is a cylindrical housing, and both sides thereof can be divided into upper and lower portions along the axial direction by separating and joining surfaces. And olefinic thermoplastic elastomers and the like, which are butt joint surfaces that are vertically divided into two in the axial direction, and end face plates 3 fitted at both ends of the sleeve 1, such as weather resistance and ozone resistance. EP with excellent characteristics such as
A rubber plate such as DM is provided, and at least one cable insertion hole 20 is formed in the end face plate 3, and the cable insertion hole 20
Is integrally provided with a thin-walled cap portion 21 capable of covering and separating the hole, and a slit 22 communicating with the cable insertion hole 20.
Is provided so as to penetrate the outer surface of the end plate so that the terminal cut by the slit 22 can be expanded. The cable is led out to the cable insertion hole 20 via the spacer 43, and further includes a joint surface facing the end face plate 3, and the divided joint surface of the sleeve 1 is provided with the concave groove 6 into which the gasket 7 can be fitted and held. , A cable holding metal fitting 4 consisting of a pressing and holding piece along the outer circumference of the cable on the inner surface facing the end plate 3.
And a coupling member 8 provided with a tension member gripping member 5 and a tension member connecting tool 9, and a buckle 30 for fastening the opposing joint surfaces of the split sleeves, and if necessary, on the outer circumference of the sleeve 1. A band 12 having a fastener 11 composed of a screw is detachably wound and provided so that the sealing property at the separation surface is enhanced and the band can be connected.

The band 12 is formed of a band-shaped metal plate or the like that can be wound around the sleeve 1, hooks are provided at both ends thereof, and the bolt 1 is engaged through engaging pieces engaged with the hooks.
1 is screwed so that the hooks can be connected and disconnected freely, but ribs (not shown) are provided on the outer periphery of the sleeve 1, and the band 12 is wound and mounted in the concave portion between the ribs. It is also considered to be useful for preventing the detachment.

The sleeve 1 is vertically separable, and a sealing material is interposed between the end face plates 3 so as to maintain the airtightness in the closure together with the sleeve gasket 7. The surfaces can be connected and integrated by fixing means. That is, a buckle 30 is provided which connects one side in the longitudinal direction of the sleeve with a hinge mechanism of a fixed hinge or a detachable hinge, and can be tightened or tightened or retightened to the other side. The end plate 3 is made of a rubber elastic body such as an oval shape, an elliptical shape, or a circular shape, and has a plurality of cable insertion holes 20 each having a thin wall cap portion 21, and the thin wall cap portion 21 is selectively cut open. And is used as a through hole, and a cable insertion hole having a slit 22 inclined with respect to a horizontal plane for easy insertion and insertion of the cable is provided.
The seal member 25 is provided in the slit 22 and is provided in the concave surface portion 23 that fits and holds the connection piece 24 across both sides of the slit 2.
And is fastened by the connecting piece 24 so that the cable insertion hole penetrates the inside and outside of the closure. (Figs. 5 to 8)

It should be noted that a spacer 43 made of rubber or the like or an air tight tape may be wound around the through hole or the cable lead-out hole formed by the cable insertion holes 20 and 20 so that the outer peripheral surface of the cable can be closely attached. It is considered. In this case, a hollow cylindrical spacer 43 is provided around the cable led out from the sleeve 1.
Is provided with a slit 44 for inserting and inserting a cable on one side of the spacer 43 so that the spacer 43 can be expanded to one side, and the inner and outer peripheries of the spacer 43 have ring-shaped mountain grooves 45, 4
It is preferable that each of them is provided with 6 to facilitate the ensuring of airtightness and to simplify the work of assembling and disassembling (FIG. 9).

Since the spacer 43 uses a rubber elastic body in a natural environment, it is made of EPDM or a styrene-based or olefin-based thermoplastic elastomer capable of contracting and expanding in accordance with the environmental temperature, and is used between the outer circumference and the sleeve and the cable. A spacer corresponding to the pressure change between the inner diameter of the insertion hole and the cable and by minimizing the pressure change, the compressive stress is secured and the low temperature shrinkage is prevented. Further, the spacer 43 is slit to facilitate the cable insertion, A plurality of ring-shaped ridges are provided on the outer peripheral surface and / or the inner peripheral surface. Also, when cables having different outer diameters are inserted into the cable insertion holes 20 of the end face plate 3, the outer diameter is the same as the insertion hole and the inner diameter is the cable outer diameter so that the insertion holes having the same diameter can be used. It is preferable that the corresponding cable spacer 43 be provided with mountain grooves on its inner and outer diameters and set on the cable to ensure airtightness.

Further, the cable holding metal fittings 4 and 4 are attached to both ends of the connecting metal fitting 8 fixed to the sleeve 1 so as to face the inner surface side of the end face plate 3, and the tension member is fixed to the holding metal fitting 5 by fixing screws. Sequential mounting, mounting fittings having a pair of rings 14, 14 in the central portion, for example, storage tray 1
5, the tension member connection tool 9 can be provided so that the core wire can be distributed and guided to be connected.
(Figs. 1 and 11)

The cable grip 4 is shown in FIG.
As shown in FIG. 3, the cable holding portion 17 along the outer periphery of the cable is rotatably provided on the receiving member 16 having the cable insertion concave portion 16 ₁ by the pin 18 to open and close, and the cable is gripped and fixed by the screw 19 so that the cable is gripped. It is made easy. That is, the receiving member 16 integrally provided with a plurality of cable insertion concave portions 16 ₁ , the bending holding piece 17 rotatably pivotingly attached to the receiving member 16 by the hinge mechanism by the pin 18 which can be attached and detached, and the bending holding piece 17. , A mounting screw 19 for attaching and detaching to the receiving member 16
It is configured to be capable of gripping a cable, and a plurality of mountain-shaped protrusions are provided on the inner surface of the receiving member and the inner surface of the curved holding piece so that a gripping force can be obtained by biting into the cable jacket. The curved holding piece 17 may have a detachable structure which is detachably attached to the receiving tool 16.

The cable tension member attached to the tension member gripping member 5 is of a single hole type or a multi-hole type, but the attachment plate is provided with one to a plurality of cable insertion portions via arms, and the sleeve 1 Holds the cable secured inside. For example, as shown in FIG. 12, the cable tension member gripping tool 51 provided in the sleeve is provided with an insertion part 47 for inserting a cable on the handling plate 49 via one or more arms 48, and fixed to the insertion part 47. It is possible to easily equip the tension member holding metal fitting 5 with a screw equipped with a screw 50 and apply tension to the center of one or more cables. The sleeve 1 or the end face plate 3 is provided with a gas inlet port (not shown) having a valve, and a sealed gas is injected from the gas inlet port to ensure protection of the closure connection portion. There is.

When assembling the connecting portion having such a structure, a spacer 43 is attached to each cable, or a cable sealing material is wrapped around the cable, and the outer jacket of the end portion of the cable is fixed by the cable grip fitting 4, and then the end face plate 3 is formed. The joint surface of the split sleeves 1 and 1 is butted against the joint surface of the sleeve 1 and the joint surface of the sleeve 1 via the gasket 7, and the buckle 30 on the outer circumference of the sleeve is tightened, and the band 12 having the fastener 11 is attached. The fasteners 11 are wound and fixed by tightening the fasteners 11, and the buckles 30 are sequentially provided at predetermined intervals.
By repeatedly attaching and tightening, the airtightness can be firmly maintained over the entire length of the sleeve 1 to form a highly reliable sealing structure. In this assembled state, since the sleeve gasket 7 is compressed in the radial direction between the vertically joined surfaces, it is possible to maintain high airtightness with a comparatively small holding force, and the end face plate 3 and A spacer 43 is interposed between the cable and the cable in the cable length direction to stabilize the posture of the sleeves 1 and 1, facilitate assembly, and significantly improve airtightness. This sleeve gasket 7 has a rectangular cross-sectional shape with rounded corners and concave grooves formed on the upper and lower surfaces to provide a lip effect, and is considered to improve the assemblability and airtightness. There is.

On the other hand, when releasing the fastened state of the sleeves 1 and 1, the bolts of the fastener 11 are loosened and the band 1 is released.
2 is removed from the sleeves 1 and 1, the fastening of the buckle 30 is released, the connecting piece 24 for preventing slit opening is removed from the end face plate 3, and the joint surface of the sleeve 1 is separated and divided, so that the cable can be easily replaced. Can be

As shown in FIG. 2, a hinge mechanism of a hooking hinge 27 and an insertion hole 28 is provided on the divided edge portion of the sleeve 1 so as to be detachable, and the hooking hinge 27 is inserted into the insertion hole. The upper and lower sleeves 1 and 1 can be easily fitted together simply by fitting the buckle 30 on the spot after fitting it on the site. That is, the hinge mechanism is
A fixed hinge or a removable hinge which is composed of a plurality of pins and corresponding insertion holes, or which is fixedly or detachably provided by a single rod penetrating the plurality of insertion holes.

As shown in FIGS. 5 to 8, the end face plate 3 is provided with a rubber spacer having four cable insertion holes 20 of equal diameter or different diameter, and a slit 22 for each hole.
A cable can be inserted and fitted by opening the end, and the change of the hole diameter of the cable insertion hole 20 and the cable diameter is performed through the end face plate 3. A seam spacer having a mountain groove on both sides made of plastic is inserted in the middle portion of the slit 22, and the diagonal slit 22 has a thin wall on one side and the outer peripheral surface of the end face plate 3 when the cable is not inserted. Since the cap portion 21 of the insertion hole can be cut off at the same time when the cable is inserted, the work can be improved and the airtightness and reliability can be improved. When the slit 22 is cut and used, the connecting piece 24 as a stopper is a concave surface to prevent the opening action and the deviation of the cut outer peripheral portion in the step of reclosing after inserting the cable with the sleeve 43. It is attached to the section 23. In addition, the outermost peripheral surface of the end face plate 3 is provided with a plurality of mountain grooves 26 over the entire circumference, and a compression force with the inner surface of the sleeve is obtained to maintain airtightness, and the compression force transmitted to the inside of the cable It is designed to be airtight with. That is, in the airtightness maintaining mechanism for the fitting portion 2 of the sleeve 1 and the end face plate 3, the mountain groove 26 is provided on the outer circumference of the end face plate 3, and the sleeve 1 receives the tightening force of the band to the mountain groove 26 to maintain the airtightness. As a result, the end face plate gasket is unnecessary and the workability of assembling and disassembling can be improved.

As shown in FIG. 11, the storage tray 15 for the core wire mounting metal fittings allows mounting of 5 to 20 tapes per tray as a fixing method for each tape, and the storage trays are stacked in multiple stages and hinged. By connecting the parts, the required tray position can be opened and the workability can be improved. In addition,
The sleeve 1 is composed of a pair of semi-cylindrical bodies that are vertically divided into two parts along the longitudinal direction, and are formed in a thicker portion toward the divided joint surface of the sleeve and are concave on the outer joint surface. Although the groove 6 is provided so as to ensure the maintenance of airtightness, it is also possible to select a cable direct insertion shape in which the end face plate 3 is omitted.

In order to closely fix the split joint surfaces of the sleeves 1 and 1, as shown in FIG. 13, one side in the longitudinal direction of the split edge portion of the sleeve is a detachable hinge consisting of a pin catching hinge 27 and an insertion hole. By making it possible to fasten the other side with the rotatable buckle 30, the workability is improved, and the sleeve gasket 7 installed in the sleeve groove 6 on the hinge side closes the sleeve 1 with the hinge as a fulcrum. It is also possible to automatically fit into the concave groove 6 of the upper and lower sleeves 1 and 1 by rotating the upper sleeve 1 and the lower sleeve 1. The hinge mechanism may be fixed to the upper and lower sleeves 1, a pin may be attached to one sleeve in the longitudinal direction, and an insertion hole may be provided opposite to the other sleeve to remove the hinge mechanism.

As the buckle 30, hooks are hooked and the upper and lower sleeves 1 can be operated with a single operation of the handle.
After fastening 1 to a predetermined size, it is preferable to use a retightening mechanism capable of further approaching the size, for example, a device provided with a screw rod and a nut so as to be adjustable.

In the sleeve 1, the end face plate 3 as shown in FIGS. 14 and 15 may be selected to have an assembled and sealed structure with the sleeve, and the end face plate 3 is provided with a plurality of ridges 26 on the outer circumference. The compression force with the inner surface of the sleeve is obtained to maintain the airtightness, and the compression force transmitted to the inside keeps the airtightness with the cable. A central spacer 29 is provided on the end face plate 3 as required, and the thin cap portions 21 formed in the plurality of cable insertion holes 20 are selectively cut and used as through holes. A slit 22 that is easy to insert and is inclined or parallel to the horizontal plane is provided.
Concave part 2 that fits and holds the connecting piece across both sides with the pinch in between
3, the seal member 25 is applied to the slit 22 and is fastened by the connecting piece, and the cable insertion hole 20 penetrates the inside and outside of the closure.

In the example of FIG. 16, the cylindrical sleeve 1 which covers the periphery of the cable connecting portion and is divided into two in the axial direction is connected and integrated by the fixing means at the joint surfaces facing each other, and the cable is inserted and led out through the spacer. The end plate portion ₁₁ having the fitting insertion recess 52 and the gasket recess groove formed on the split joint surface 54 is integrally provided at both ends of the sleeve 1 so that the end plate and the assembling work thereof are omitted to directly connect the cable. It can be inserted, the airtightness can be easily secured, and the handling is simple. Furthermore, the split sleeves 1 and 1 are connected to one side in the longitudinal direction by a hinge mechanism of a fixed hinge or a detachable hinge 27 and tightened to the other side. A buckle 30 that can be tightened as needed is provided to facilitate the work of assembling and disassembling the sleeve.

[0023]

According to the present invention, a butt joint surface that covers the periphery of a cable connection portion and axially divides a cylindrical sleeve from which a cable can be led out is formed. In a closure integrally connected by a fixing means, at least one cable insertion hole is formed in an end plate provided on the sleeve as needed, and a hollow cylindrical spacer is fitted around a cable led out from the cable insertion hole. By inserting and deploying the cable seal material with ring-shaped mountain grooves formed on the inner and outer peripheries of the spacer, the cable lead-out portion can be easily and airtightly tightened, and the cable connection part can be covered and accommodated. It can be performed remarkably quickly, and it can cope with the difference in size of the cable diameter. With wear, handling is good, help facilitate the assembly work, the connection fixing both easy comfortably safely performed configuration, can be made inexpensive form.

[Brief description of drawings]

FIG. 1 is a perspective view of a use state in which an embodiment of the present invention is separated and a part is separated and a notch is shown.

FIG. 2 is an exploded perspective view of a portion of the sleeve of FIG.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a partially cut side view of the example of FIG. 1 in an assembled state.

5 is an enlarged front view of the end plate of the example of FIG.

FIG. 6 is a sectional plan view taken along the line AA of FIG.

7 is a cut side view taken along line BB of FIG.

FIG. 8 is a side view as seen from the outside of FIG.

FIG. 9 is an embodiment of a spacer, (a) is a side view,
(B) is a front view and (c) is a vertical cross-sectional view taken along line YY.

10 is a front view of the cable grip fitting of the example of FIG. 1. FIG.

11 is a side view of the storage tray of the example of FIG. 1, FIG.
(B) is the top view.

FIG. 12 is an embodiment of a cable tension member gripping tool, (a) is a front view and (b) is a plan view.

FIG. 13 is a perspective view of a notched sleeve according to another embodiment of the present invention.

FIG. 14 is another embodiment of the end plate, (a) is a front view,
(B) is a partially cut plan view, and (c) is a longitudinal sectional view.

15A and 15B are still another embodiment of the end plate, FIG. 15A is a front view, FIG. 15B is a partially cut plan view, and FIG. 15C is a side view.

FIG. 16 is a perspective view of another embodiment of the sleeve of the present invention in a partially cutaway state.

[Explanation of symbols]

1 Sleeve 2 Side Fitting Part 3 End Face Plate 4 Cable Grip Metal Fitting 5 Tension Member Grip Metal Fitting 6 Recessed Groove 7 Sleeve Gasket 8 Connection Metal Fitting 9 Tension Member Grip Metal Fitting 11 Fastener 12 Band 14 Ring 15 Storage Tray 16 Receiver 16 ₁ Cable Insertion concave part 17 Holding piece 18 Pivot 19 Screw 20 Cable insertion hole 21 Thin-walled cap part 22 Slit 23 Concave part 24 Connection piece 25 Seal member 26 Mountain groove 27 Hinge 28 Insert hole 29 Spacer 30 Buckle 31 Bracket 32 Handle 33 Rotating member 34 Screw Rod 35 Pin 36 Nut 37 Hook 38 Pin 43 Spacer 45, 46 Mountain Groove 51 Cable Tension Member Holding Tool

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kohei Sasaki 1-25-17 Himonbunya, Meguro-ku, Tokyo Toto Soken Co., Ltd. Address: Nihonhon Denshin Denryoku Co., Ltd. (72) Inventor, Kunihiko Jimbo 1-12-23 Tajiri, Ichikawa City, Chiba Daiichi Gijutsu Sangyo Co., Ltd. No. 6 Nihon Telegraph and Telephone Corporation (72) Inventor Koji Okamoto 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (4)

[Claims] 1. A butt joint surface that covers the periphery of a cable connection portion and divides a cylindrical sleeve from which a cable can be drawn into two in the axial direction, and the joint surfaces of the divided sleeves that face each other are connected by a fixing means. In the integrated closure, a hollow cylindrical spacer is fitted and arranged around the cable led out from the cable insertion hole of the sleeve, and ring-shaped mountain grooves are provided on the inner circumference and the outer circumference of the spacer, respectively. Cable seal material for cable connection closures. 2. The cable seal according to claim 1, wherein the spacer is made of EPDM rubber or thermoplastic elastomer and has a cable insertion hole at its center, and a cable insertion slit communicating with the cable insertion hole is provided on one side of the spacer. Material. 3. The spacer according to claim 1, wherein the spacer has an outer periphery into which the cable insertion hole can be fitted, and a plurality of mountain grooves are provided at radially spaced intervals on an inner and outer peripheral surface having an inner periphery along the cable outer periphery. The cable seal material described in 2. 4. The spacer is fitted in a cable insertion hole formed in an end face plate provided at both ends of the sleeve, and is provided by expanding a slit communicating with the cable insertion hole. The cable sealing material according to 2 or 3.