JP3628059B2 - Cable sealant for cable connection closure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an improvement in a cable seal material used in a closure for protecting a connection portion of a communication cable such as an optical cable, in particular, a closure for an optical cable.
[0002]
[Prior art]
Generally, a cable connection closure is composed of an end face plate that is attached through cables on both sides of a cable connection portion, and a vertically divided cylindrical sleeve that covers and accommodates the connection portion. A structure is often used in which the divided butted portions of the sleeve that are opposed to each other are connected and integrated by fixing means such as bolts or bands, so that the cable connection portion is hermetically protected.
[0003]
Since the sleeve of the housing that protects the connection portion of the conventional cable must maintain rigidity to prevent deformation of the sleeve and prevent moisture from entering, the sleeve components are tightly coupled to each other, and the cable The connection between the ends must also be tight, the outer diameter of the cable to be derived varies, and the set handling is troublesome, and the cable housing provided with an airtight material is complicated to manufacture, expensive, and expensive. There is also a problem in terms of durability, and even when a cable sealing material is used, there is a problem that management of tightening force and assembly workability are complicated to ensure airtightness.
The present invention is intended to eliminate these conventional drawbacks. In the cable connection closure, the cable can be easily led out from the sleeve, the safety and the airtightness can be improved, and the assembling workability can be greatly improved. The object is to provide a sealing material.
[0004]
[Means for Solving the Problems]
The present invention forms a butt joint surface that covers the periphery of the cable connection portion and divides the cylindrical sleeve into which the cable can be led into two parts in the axial direction, and the joint surfaces facing each other of the split sleeve are connected and integrated by a fixing means. In the closed closure, a hollow cylindrical spacer is fitted and arranged around the cable led out from the cable insertion hole of the sleeve, and a cable seal material provided with ring grooves in the inner periphery and outer periphery of the spacer, respectively It is a thing.
[0005]
[Action]
After stripping the cable jacket to the required length and cutting the internal slot rod to the specified dimension, strip the tension member to the specified dimension using a cutter etc. Finish preparation. After the cable sheath is polished and cleaned in the circumferential direction and the cable spacer is inserted, the thin cap part and the oblique slit part that become the cable insertion hole of the end face plate are cut and opened, and the slit terminal is expanded. Then, insert the cable, let it pass through the cable insertion hole, attach a sealing member with a ridge to the slit part, fit the connection piece to keep the slit closed, and cover the slit part on the outer peripheral part of the end face plate Adhere the tape-like gasket so that it fits. After that, attach the cable gripping bracket to the cable jacket using the necessary spacers, fasten it with the specified torque with the fastening bolts, and then use the tension member gripping bracket to the tension member gripping bracket with the fastening screw. Tighten with torque. Then, while pressing the end plate against the lower sleeve, fit it with the end plate gasket, cover the upper sleeve, press the sleeves together, tighten the fasteners one after the other from the central part, and install them at the specified torque. It is assembled by fastening in parts, and the mounting posture of the cable sealing material and end face plate is made stable and strong, and the sealing performance is greatly improved, and it is used safely as a closure by the gas injected from the valve. .
[0006]
【Example】
The present invention will be described with reference to an example of a closure including the 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. FIGS. As described above, the trunk optical cable is passed through the end face plates 3 and 3 and fixed by the cable holding bracket 4, and the tension member of the cable is connected and connected to the tension member holding bracket 5. The sleeve 1 is a cylindrical housing that can be divided vertically along the axial direction with separate joining surfaces, and is made of flame retardant FRPP or styrene filled with synthetic resin, such as PP resin or glass fiber. A butt-joint surface that is made of a olefin-based or olefin-based thermoplastic elastomer, and is divided into two parts in the axial direction, and end face plates 3 that are fitted to both ends of the sleeve 1, such as weather resistance and ozone resistance. And a rubber plate made of EPDM or the like having excellent characteristics such as, at least one cable insertion hole 20 is formed in the end face plate 3, and a thin cap portion 21 that covers and separates the hole is integrally formed in the cable insertion hole 20. In addition, a slit 22 communicating with the cable insertion hole 20 is provided so as to penetrate the outer surface of the end face plate so that the terminal incised by the slit 22 can be expanded. .
A cable is led out to the cable insertion hole 20 via a spacer 43, and further includes a joint surface facing the end face plate 3 and a groove 6 into which the gasket 7 can be fitted and held on the split joint surface of the sleeve 1. On the inner surface facing the end face plate 3, a cable fitting 4 comprising a presser holding piece along the outer periphery of the cable, and a connecting fitting 8 provided with a tension member holding fitting 5 and a tension member connector 9 are fixedly equipped, and further divided. A buckle 30 for fastening the opposing joint surfaces of the sleeve is provided, and if necessary, a band 12 having a fastener 11 made of a screw is detachably wound around the outer periphery of the sleeve 1 to improve sealing performance on the separation surface. So that it can be connected.
[0007]
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 bolts 11 are screwed through engagement pieces engaged with the hooks so that a gap between the hooks is obtained. It is designed so that it can be connected and separated freely, but it is also considered that a rib (not shown) is provided on the outer periphery of the sleeve 1 and a band 12 is wound around the recess between the ribs to help prevent it from coming off. Is done.
[0008]
The sleeve 1 is configured so that it can be divided into upper and lower parts, 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, and the joint surfaces facing each other are fixed. It can be connected and integrated by means. In other words, one side in the longitudinal direction of the sleeve is connected by a hinge mechanism of a fixed hinge or a detachable hinge, and a buckle 30 that can be tightened or tightened to the other side and retightened is provided. The end face plate 3 is made of a rubber elastic body such as an oval shape, an oval shape, or a circular shape, and has a thin cap portion 21 in each of the plurality of cable insertion holes 20. The thin cap portion 21 is selectively cut and opened. The cable insertion hole 20 has a slit 22 that is inclined with respect to the horizontal plane so that the cable can be easily inserted, and the connection piece 24 is fitted across both sides of the slit 22. It is provided in the concave portion 23 to be held together, and is configured to be fastened by the connecting piece 24 by applying the seal member 25 to the slit 22 so as to penetrate the cable insertion hole 20 into and out of the closure. is there. (FIGS. 5 to 8)
[0009]
In addition, it is considered that the outer peripheral surface of the cable can be closely attached to the through hole or the cable outlet hole formed by the cable insertion holes 20 and 20 by winding a spacer 43 made of rubber or air tight tape. Yes.
In this case, a hollow cylindrical spacer 43 provided on the periphery of the cable derived from the sleeve 1 is provided around the cable insertion holes 46 _1, and a slit 44 communicating from the outside to the cable insertion hole 46 ₁ is provided It can be expanded to one side.
That is, a slit 44 for inserting and inserting a cable is provided on one side of the spacer 43, and the inner and outer circumferences of the spacer 43 are provided with ring-shaped grooves 45 and 46, respectively. It is better to simplify the handling of the sex (FIG. 9).
[0010]
Since this spacer 43 uses a rubber elastic body in a natural environment, it uses EPDM or a styrene-based or olefin-based thermoplastic elastomer that can shrink and expand in accordance with the environmental temperature, and between the outer periphery and the sleeve, the inner diameter of the cable insertion hole. And spacers that respond to pressure changes between the cable outer periphery and the pressure change as much as possible to ensure compressive stress and prevent low-temperature shrinkage. Furthermore, the spacer 43 has a slit 44 to facilitate cable insertion, When a plurality of ring-shaped ridges are provided on the surface and the inner peripheral surface, and cables having different outer diameters are inserted into the cable insertion holes 20 of the end face plate 3, the insertion holes with the same diameter can be used. Therefore, the outer diameter is the same as the insertion hole, and the inner diameter is a cable spacer 43 corresponding to the outer diameter of the cable. There a structure airtightness can be ensured by setting.
[0011]
Further, the cable gripping brackets 4 and 4 are attached to both ends of the connecting bracket 8 fixed to the sleeve 1 so as to face the inner surface of the end face plate 3 with mounting screws, and the tension members are sequentially fixed to the gripping bracket 5 with fixing screws. A storage mounting bracket having a pair of rings 14 and 14 at the center, for example, a storage tray 15, is provided, and a tension member connector 9 can be provided so that the core wire can be distributed and guided. (FIGS. 1 and 11)
[0012]
As the cable clamping hardware 4, and the curved holding pieces 17 along the cable outer circumference receiving fixture 16 with a cable insertion recess 16 ₁ is provided rotatably by a pin 18 to open and close as shown in FIG. 10, the cable with screws 19 The cable can be easily gripped by holding the cable. That is, the receiving fixture 16 provided more integrally the cable insertion recess 16 _1, the curved holding piece 17 of the hinge mechanism is rotatably pivoted by removable pins 18 to receiving member 16, the curved holding pieces 17 And a mounting screw 19 that is attached to and detached from the receiver 16 so that the cable can be gripped. A plurality of mountain-shaped protrusions are provided on the inner surface of the receiver and the inner surface of the bent holding piece, and the cable jacket is engaged. The gripping force can be obtained with this. The bent holding piece 17 may have a detachable structure that is detachably provided on the receiver 16.
[0013]
The cable tension member attached to the tension member gripping bracket 5 uses a single hole type or a plurality of hole types. However, one to a plurality of cable insertion portions are provided on an attachment plate via an arm, and are fixed in the sleeve 1. To hold the cable.
For example, the cable tension member gripper 51 provided in the sleeve is provided with an insertion portion 47 into which the cable is inserted and inserted into the handling plate 49 through one or more arms 48 as shown in FIG. Equipment equipped with the attached screw 50 can be easily installed by attaching to the tension member holding metal fitting 5 and applying tension at the center of one or more cables.
The sleeve 1 or the end face plate 3 is provided with a gas inlet part (not shown) having a valve, and a sealed gas is injected from the gas inlet part to ensure the protection of the closure connecting part. It is.
[0014]
When assembling the connection portion having such a structure, a spacer 43 is attached to each cable, or a cable sealing material is wound, and the outer cover of the end portion of the cable is fixed by the cable gripping metal fitting 4, and then the joining surface of the end face plate 3 Further, the joining surface of the split sleeves 1 and 1 is abutted against the joining surface of the sealing material and the sleeve 1 via the gasket 7, the buckle 30 on the outer periphery of the sleeve 1 is tightened, and the band 12 with the fastener 11 is wound. The fastener 11 is fastened and fixed, and the attachment and tightening of the buckle 30 are sequentially repeated at a predetermined interval so that the airtightness can be maintained over the entire length of the sleeve 1 and a highly reliable sealing structure can be obtained.
In this assembled state, the sleeve gasket 7 is compressed in the radial direction between the vertically joined surfaces, so that high airtightness can be maintained with a relatively small gripping force. A spacer 43 is interposed between the cable and the cable in the length direction of the cable, so that the posture of the sleeves 1 and 1 is stabilized, the assembly is facilitated, and the airtightness can be remarkably improved. The sleeve gasket 7 has a rectangular cross-section and rounded corners, and a concave groove is formed on the upper and lower surfaces to give a lip effect, so as to improve assembly and airtightness. Yes.
[0015]
On the other hand, when releasing the fastening state of the sleeves 1, 1, the bolts 12 of the fasteners 11 are loosened to remove the band 12 from the sleeves 1, 1, and the fastening of the buckle 30 is released to prevent the slit opening from the end face plate 3. If the connecting piece 24 is removed and the joining surface of the sleeve 1 is separated and divided, the replacement of the cable can be facilitated.
[0016]
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 28 in the field. After the fitting, the upper and lower sleeves 1 and 1 can be easily aligned simply by hooking and fastening the buckle 30. That is, the hinge mechanism is composed of a plurality of pins and corresponding insertion holes, or a fixed hinge or a detachable hinge that is fixed or detachably provided by a single support penetrating the plurality of insertion holes. To do.
[0017]
As shown in FIGS. 5 to 8, the end face plate 3 has a rubber insertion spacer 20 having a diameter of 4 holes of equal or different diameter, and has a slit 22 for each hole. The cable can be inserted and fitted, and the hole diameter of the cable insertion hole 20 and the change in the cable diameter are handled via the end face plate 3. A gap spacer having plastic grooves in both sides of the slit 22 and having a groove on both sides can be inserted. The oblique slit 22 has a thin wall on one side and outer peripheral surface of the end plate 3 when no cable is inserted. Since the cap portion 21 of the insertion hole is excised at the same time as the cable is inserted, the cap portion 21 can be excised and opened, thereby improving workability and airtight reliability.
When the slit 22 is used after being cut off, the connection piece 24 as an opening stopper is a concave surface in order to prevent the opening and shifting of the outer peripheral portion cut off during the closing process after inserting the cable with the sleeve 43. Attached to the part 23.
Further, the outermost peripheral surface of the end face plate 3 is provided with a plurality of ridges 26 over the entire circumference so that a compressive force with the sleeve inner surface is obtained and airtightness is maintained, and the cable is transmitted by the compressive force transmitted to the inside. Airtightness is obtained.
In other words, the airtight holding mechanism between the fitting portion 2 of the sleeve 1 and the end face plate 3 is provided with a ridge groove 26 on the outer periphery of the end face plate 3 so that the sleeve 1 can receive the band tightening force and be transmitted to the ridge groove 26 to keep the airtightness. In this way, the end face plate gasket is not required and the assembly and disassembly workability can be improved.
[0018]
As shown in FIG. 11, the storage tray 15 for the core wire mounting bracket can be mounted with 5 to 20 tapes / tray as a fixing method for each tape, and the storage trays are stacked in multiple stages and connected by hinges. Thus, the position of the necessary tray can be opened and workability can be improved.
The sleeve 1 is composed of a pair of semi-cylindrical bodies that are vertically divided in the longitudinal direction along the longitudinal direction, and is formed in a thick portion as it goes to the divided joining surface of the sleeve, and the outer joining surface However, it is also possible to select a cable direct insertion shape in which the end face plate 3 is omitted.
[0019]
As shown in FIG. 13, the sleeve 1 and 1 are joined to each other in the longitudinal direction of the split edges of the sleeves 1 and 1 as a detachable hinge including a pin hooking hinge 27 and an insertion hole as shown in FIG. Workability is improved by enabling tightening with a rotatable buckle 30, and the sleeve gasket 7 installed in the sleeve groove 6 on the hinge side rotates in a direction to close the sleeve 1 with the hinge as a fulcrum. Thus, it is possible to automatically fit in the concave grooves 6 of the upper and lower sleeves 1, 1. As the hinge mechanism, it can be selected that the upper and lower sleeves 1 are fixed, a pin is attached to one sleeve in the longitudinal direction, and an insertion hole is provided on the other sleeve so as to be attached and detached.
[0020]
The buckle 30 can be adjusted with a retightening mechanism, such as a screw rod and a nut, which can be further approached after a hook is hooked and the upper and lower sleeves 1 and 1 are fastened to a predetermined size by one-touch operation. It is good to use what was made like this.
[0021]
In addition, the sleeve 1 may have an assembly sealing structure with the sleeve by selecting the end face plate 3 as shown in FIGS. 14 and 15, and the end face plate 3 is provided with a plurality of groove grooves 26 on the entire outer periphery, and the inner surface of the sleeve 1 is provided. Thus, the airtightness of the cable is maintained by the compressive force transmitted to the inside.
In addition, a spacer 29 serving as a shape retaining piece is fitted in the center of the end face plate 3 as necessary, and the thin cap portions 21 formed in the plurality of cable insertion holes 20 are selectively cut open and used as through holes. In addition, a slit 22 that is inclined or parallel to the horizontal plane is provided so that the cable can be easily inserted, and a concave portion 23 that fits and holds the connecting piece across both sides of the slit 22 is provided. In addition, the seal member 25 is applied to the slit 22 and fastened by a connection piece, and the cable insertion hole 20 is penetrated into and out of the closure.
[0022]
In the example of FIG. 16, the cylindrical sleeve 1 that covers the periphery of the cable connecting portion and bisects in the axial direction is joined and integrated with the joining surfaces facing each other by fixing means, and the cable can be inserted and led out via a spacer. an end plate portion 1 ₁ formed with the use recess 52 and gasket groove the split joint surface 54 can insert arranged in direct cable omit the assembling work of the end face plate provided integrally with both ends of the sleeve 1, Ensuring airtightness is easy and easy to handle. Further, 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 accordingly is provided to facilitate assembly and disassembly of the sleeve.
[0023]
【The invention's effect】
The present invention forms a butt joint surface that covers the periphery of the cable connection portion and divides the cylindrical sleeve into which the cable can be led into two parts in the axial direction, and the joint surfaces facing each other of the split sleeve are connected and integrated by a fixing means. In the closed closure, at least one cable insertion hole is formed in an end face plate provided in the sleeve as necessary, and a hollow cylindrical spacer is fitted and arranged around the cable led out from the cable insertion hole, The spacer is made of EPDM rubber or thermoplastic elastomer and has a cable insertion hole at the center, and is provided with a cable insertion slit that communicates with the cable insertion hole, and has an outer periphery that can be inserted into the cable insertion hole, and By having a cable insertion hole with an inner periphery along the cable outer periphery, and providing a plurality of ridges on the inner and outer peripheral surfaces with radial spacing. , Spacer corresponding to pressure change between outer circumference and sleeve, cable insertion hole inner diameter and cable outer circumference, and reducing pressure change as much as possible to secure compressive stress and prevent low temperature shrinkage, and make the cable lead-out part airtight The spacer can be easily tightened, and the spacer is processed with a slit to facilitate cable insertion, and a plurality of ring-shaped peaks are provided on the outer peripheral surface and the inner peripheral surface, and the cable insertion hole of the end face plate is provided. When cables with different outer diameters are inserted into the cable, the outer diameter is the same as the insertion hole and the inner diameter is the same as the outer diameter of the cable spacer corresponding to the outer diameter of the cable. Since it has a structure that can secure airtightness by providing a groove in the cable and setting it in the cable, it is possible to carry out the covering operation of the cable connection part extremely quickly, and the cable diameter Even small differences can be accommodated, and evenly compressed over the entire circumference to ensure a reliable seal, good handling, easy assembly work, easy and secure connection, simple configuration, and low cost. It can be in the form.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention in a use state in which a part is separated and cut out to show the inside.
2 is an exploded perspective view of a portion of the sleeve of FIG. 1. FIG.
FIG. 3 is a front view of FIG. 2;
4 is a partially cut side view of the assembled state of the example of FIG. 1. FIG.
FIG. 5 is an enlarged front view of the end face plate of the example of FIG. 1;
6 is a sectional plan view taken along line AA in FIG.
7 is a cut-away side view taken along the line BB in FIG.
8 is a side view seen from the outside of FIG. 5. FIG.
9A is a side view, FIG. 9B is a front view, and FIG. 9C is a longitudinal sectional view taken along line YY.
FIG. 10 is a front view of the cable gripping metal fitting in the example of FIG. 1;
11A is a side view and FIG. 11B is a plan view of the storage tray in the example of FIG. 1;
FIGS. 12A and 12B show an embodiment of a cable tension member gripping tool, in which FIG. 12A is a front view and FIG.
FIG. 13 is a perspective view of a sleeve in which a part of another embodiment of the present invention is cut away.
14A is a front view, FIG. 14B is a partially cut plan view, and FIG. 14C is a longitudinal sectional view of another embodiment of the end face plate.
15A is a front view, FIG. 15B is a partially cut plan view, and FIG. 15C is a side view.
FIG. 16 is a partially cutaway perspective view of another embodiment of the sleeve of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sleeve 2 Side fitting part 3 End face plate 4 Cable holding metal fitting 5 Tension member holding metal fitting 6 Groove 7 Sleeve gasket 8 Connecting metal fitting 9 Tension member connector 11 Fastener 12 Band 14 Ring 15 Storage tray 16 Receptacle 16 ₁ Cable Insertion recess 17 Holding piece 18 Pivot 19 Screw 20 Cable insertion hole 21 Thin cap portion 22 Slit 23 Concave portion 24 Connection piece 25 Seal member 26 Mountain groove 27 Hinge 28 Insertion hole 29 Spacer 30 Buckle 31 Bracket 32 Handle 33 Rotating member 34 Screw杆 35 Pin 36 Nut 37 Hook 38 Pin 43 Spacer 44 Slit 45, 46 Mountain groove 46 ₁ Cable insertion hole 51 Cable tension member gripping tool

Claims (2)

A butt joint surface that covers the periphery of the cable connecting portion, divides the cylindrical sleeve 1 into which the cable can be led out from the cable insertion hole in the axial direction, is formed, and the cable insertion hole 20 is provided on the end surface portion of the sleeve 1; In the closure in which the joint surfaces facing each other of the divided sleeves are connected and integrated by fixing means, a hollow cylindrical spacer 43 is fitted around the cable led out from the cable insertion hole 20 of the sleeve 1 , and the spacer 43 is provided in the center of the cable insertion holes 46 ₁ made of EPDM rubber or thermoplastic elastomer, which was provided with a cable insertion slit communicating with said cable insertion holes 46 _1, it can fitted into the cable insertion hole 20 It has an outer periphery, and has a cable insertion hole 46 ₁ having an inner periphery along the cable outer circumference, apart radially inner and outer peripheral surfaces Cable sealing material in the closure cable connection, characterized in that a plurality of Yamamizo 45 and 46 are. The spacer 43 is inserted into a cable insertion hole 20 formed in an end face plate 3 provided at both ends of the sleeve 1, and is equipped with an opening of a slit 22 communicating with the cable insertion hole 20. The cable sealing material described.

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