JPH0297216A - Cable joint closure - Google Patents

Abstract

PURPOSE:To provide a general use cable joint closure which can be used for cables having different diameters by constructing a grip metal with pressure screw members and arranging a seal member composed of elastic material such as rubber between a cable through-hole and a cable. CONSTITUTION:At first, a grip metal 31 is split into two grip metal chips 31a, 31a which are applied onto cables 10, 11, then the grip metal chips 31a, 31a are jointed through bolts 33 and integrated. Thereafter, each pressure screw member 32 is fastened uniformly by means of a screw driver being set to a predetermined fastening torque so that a stopper board 34 contacts against the outer circumferential faces of the cables 10, 11. An end face board 40 is split into two board chips 44, 44 and fitted to the cables 10, 11, then they are jointed through a fastening bolt 45. A cable seal member 47 previously wound around the outer circumferential faces of the cables 10, 11 seals the gap formed between a cable through-hole and the cables 10, 11.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention prevents water from entering the connecting portion of a communication cable, etc., and reduces the tensile force acting on the communication cable, etc.
There is C related to a cable connection closure that protects a connection part from external forces such as compressive force and vibration.

(Prior art) At the connection point of a communication cable, it is necessary to remove the outer jacket of the cable and protect it from the intrusion of water etc. from the outside after the cable is connected. Cable connection closures having an airtight structure have been used.

In this cable connection jar, pressurized air, nitrogen gas, etc. is sealed inside the cable to prevent water from entering from the outside, and to make the cable part more completely waterproof. When doing so (commonly known as "gas maintenance"), it is also required to prevent sealed pressurized air, nitrogen gas, etc. from leaking to the outside from the connection part.

FIG. 5 is an exploded perspective view showing an example of a conventional cable connection closure of this type, designated by reference numeral 100 in the figure.

110 is a cable, 200 is a sleeve, 300 is a gripping hardware, and 400 is an end plate.

The sleeve 200 has a cylindrical shape and is divided into two sleeve pieces 210, 210 with a semicircular cross section, which cover the cables 100, 110 and the connecting part 120. Here, the sleeve pieces 210, 210
A sleeve connection bolt 230 is attached to the joint portions 211, 211 of
By attaching and interconnecting the sleeve pieces 21
0,210 are integrated. In addition, this joint portion 211,
A sleeve sealing material 220 is interposed between the sleeves 211 and 211 .

Further, the gripping hardware 300 has dimensions as shown in detail in FIG.
Cut line 1 provided in the cable sheath 101 (111)
01a (111a) to cable core (not shown)
A pair of internal gripping metal fittings 310 having a semicircular cross section are inserted between the cable sheath 101 (111) and the cable sheath 101 (111) (the figure shows the joint portion 311 protruding from the cable sheath 101) 111), a pair of external gripping fittings 320 having a semicircular cross section and fitted from the outside.
The connecting portion 311 of the internal gripping hardware 310 and the connecting portion of the external gripping hardware 320 are connected by bolts 33.
Cable 100 (110
) is fixed to the outer periphery of the

=3 This gripping hardware 300 is fixed to the cables 100 and 110, respectively, and two rigid connecting rods 500.
By connecting and covering the connecting portions 500 with each other, the connecting portion 120 is prevented from acting on the connecting portion 120. ′? l' 1. Furthermore, the external force acting on the cables 100, 110 is stopped by the gripping metal fittings 300, 300 and the connecting rods 500, 500.

The end plate 400 is made of an elastic material, has a cable through hole 410 in the center, and is inserted into the openings 240 at both ends of the sleeve 200 in the axial direction. As shown in detail in FIG. 7, it is divided into two end plate pieces 420.420 with a semicircular cross section.The joint parts 421, 42 of the end plate pieces 420.4.20
1 are connected to each other by connecting pols 1-422. Here, between the joint parts 421 and 421, a mating surface seal 4 is provided.
60 is interposed. In addition, a filling part 411 for filling the adhesive sealing material 430 is provided at the center of the inner peripheral surface of the cable through hole 410, and an elastic material is provided on both sides of the filling part 411 to prevent the adhesive sealing material 430 from leaking. A portion 412 into which a sealing washer 440 made of wood fits is provided. Further, the outer circumferential surface of the end plate piece 420 is connected to the sleeve piece 21.
The IC recess 241 is formed on the inner peripheral surface of the opening 240 of 0, and a recess 422 is formed on the outer peripheral surface thereof to be filled with an adhesive seal 450.

Note that metal plates may be attached to both sides of the end plate 400 in order to cover the end plate 400 so that it does not expand due to the pressure of the gas sealed inside the closure (inside the sleeve 200) and lose airtightness.

In the cable connection closure described above, the connecting portion 120 is covered with the sleeve 200, the openings 240 at both axial ends of the sleeve 200 are closed with the end plates 400, 400, the sleeve sealing material 220, the adhesive sealing material 430, the adhesive By creating an airtight structure inside the sleeve 200 with the sealing material 450, it is possible to prevent water, etc. from entering the connecting portion 120 from the outside, and also prevent pressurized air, nitrogen gas, etc. sealed in for "gas maintenance" from entering the outside. prevent leakage. Then, the external force acting on the cables 100, 110 is stopped by the gripping hardware 300, 300 and the connecting rod 500, 500 so that it does not act on the connecting portion 120.

(Problems to be Solved by the Invention) However, the above-described conventional cable connection closure has the following problems regarding each component.

That is, regarding the gripping hardware 300, the internal gripping hardware 3101 and the external gripping hardware 320 constituting it are connected to the cable 1.
00,110, cable 1oo,
110, the number and types of parts increase, which poses a problem that hinders efforts to reduce the cost of Cron V.Furthermore, it is difficult to fix the gripping hardware 300 to the cable 100°110. , the cable sheath 101 (
111) is provided with a score line 1o1a (111a) to divide it into 4 to 6 equal parts, and an internal gripping hardware 31 is provided between the cable core (not shown) and the cable sheath 101 (111).
There was a problem in that the assembly process took time because 0 was inserted. Roughly speaking, the gripping hardware 300 is connected to each other by the connecting rod 500, but since the connecting rod 500 occupies a part of the space inside the closure, there is a problem that this space cannot be utilized.

Also, regarding the end plate 400, the cable 100 (11
Since the adhesive sealant 4.30 is used to seal between the end plate 400 and the cable through hole 41
It is not possible to make a large difference between the inner diameter of cable 100 (110) and the outer diameter of cable 100 (110).
(110), which similarly increases the number and types of parts, which poses a problem that hinders attempts to reduce closure loss by 1 to 1.

Furthermore, there were also the following problems regarding the airtight structure inside the closure.

In other words, the adhesive sealant 4 is filled between the cable through hole 410 and the cable 100 (110) in order to maintain airtightness for a long time against expansion and contraction caused by temperature changes.
30, sleeve 200 and end plate 4. It is necessary to always add a horn to the adhesive seal 450 that is filled between the adhesive seal 450 and make it tightly adhere to the part that comes in contact with these adhesive seals 450,
For this purpose, the end plate 400 is formed of a rubber elastic material, and the elastic repulsive force generated by compression of the end plate 400 is used to apply force to the adhesive sealing material 430,450. However, by tightening the sleeve connection ports 1 to 230 and compressing the end plate 400, even if force is applied to the adhesive sealing material 430, the inner peripheral surface of the cable through hole 410 and the outer peripheral surface of the cable 100<110) Sealing washer 440
It was difficult to deform the adhesive sealing material 430 until the gap surrounded by the groove was completely filled with the detailed unevenness so that there were no gaps, and a very large tightening force was required. For example, it is necessary to apply a huge torque of 180 kg·cm to a large number of sleeve connecting bolts 230 using a torque wrench or the like, resulting in poor assembly workability.

Furthermore, since adhesive sealing materials 430 and 450 are used, there is a problem in that even if it is attempted to disassemble for reconnection, it will be extremely difficult due to the strong adhesion of the sealing portions.

This invention solves the above-mentioned problems of the prior art.The purpose of this invention is to provide versatility that can be used even if the diameter of the cable changes, thereby making it possible to reduce costs. We provide a cable connection closure that can ensure airtightness, improve assembly work efficiency, make effective use of the space inside the closure, and require no effort to disassemble for reconnection. It's about doing.

[Structure of the Invention] (First Means for Solving the Problem) In order to achieve the above object, the cable connection closure according to claim (1) of the present invention is divided into a plurality of sleeve pieces that cover and accommodate the cable connection part. a pair of end plates that have cable through holes and fit into and cover openings at both axial ends of the sleeve; and a pair of gripping hardware that grips the cable within the sleeve. In the cable connection closure that maintains the cable in an airtight state and protects the cable connection portion from external force, the end plate is made of a highly rigid material, and the gripping hardware is attached to a cylindrical gripping tool. It is configured by arranging pressing screw members that contact the cable at appropriate intervals in the circumferential direction, and further between the joint surfaces of the sleeve pieces, between the cable through hole and the cable, and between the end plate and the opening of the sleeve. It is characterized by a structure in which a sealing material made of an elastic material such as rubber is interposed between the parts.

Further, in the cable connection closure according to claim (2),
The gripping hardware may be integrally formed with the inner surface of the end plate, or may be formed separately and connected to and covered with the inner surface of the end plate.

In the cable connection device according to requirement (3), the end plate is made of plastic or glass fiber-containing reinforced plastic.

Further, in the cable connection closure according to claim (4),
The sleeve and the end plate are made of the same material.

(Function) The gripping hardware is fixed to the cable by covering the cable with the gripping tool, tightening the pressing screw member, and touching the cable outer skin. In this case, even if the diameter of the cable changes, it is only necessary to adjust the movement of the pressing screw member. Further, since the gripping hardware is mounted on the end plate or connected to the end plate, there is no need to connect the gripping hardware to a connecting rod or the like in a rigid manner. In addition, pass the cable through the cable through hole and attach the end plate. Cover the cable connection portion with a sleeve piece so that the end plate fits into the opening.

Then, when a plurality of sleeve pieces are integrated with a sleeve fastening member such as a band, the sealing material receives compressive force from the sleeve and is elastically deformed, and the sealing material is elastically deformed between the joining surfaces of the sleeve pieces and between the end plate and the frontage of the sleeve. Fill the gaps in between to ensure airtightness. In addition, between the cable penetration hole and the cable, when the cable is passed through the cable penetration hole and the end plate is attached to the cable, the sealing material receives compressive force from the end plate and deforms elastically to ensure airtightness. .

This prevents water, etc. from entering the cable connection portion from the outside, and also prevents pressurized air, etc. sealed for "gas maintenance" from leaking to the outside. Furthermore, even if an external force is applied to the cable, the gripping hardware, end plate, and sleeve prevent the external force from acting on the connection portion of the cable.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

Figures 1 to 4 show one embodiment of this invention.
, Fig. 1 is a perspective view of the whole with a part cut away, Fig. 2 is an exploded perspective view of the end plate portion, Fig. 3 is a cross-sectional view of the gripping metal part, and Fig. 4 is the A--A in Fig. 3. It is a sectional view taken along the line A. In the figure, reference numerals 10 and 11 are cables, 20 is a sleeve, 30 is a gripping hardware, and 40 is an end plate.

The sleeve 20 is cylindrically formed and the cable 10.1
1, and has a 12-piece structure divided into two sleeve pieces 22 and 22 each having a semicircular cross section, and a plurality of sleeves are fastened around each other at appropriate intervals in the axial direction. By tightening the member 24, the sleeve pieces 22,22 are held together. Here, a sleeve sealing material 23 is interposed between the joining surfaces 22a and 22a of the sleeve pieces 22.22, and when the sleeve fastening member 24 is tightened, this sleeve sealing member 23 is elastically deformed by compressive force, and the sleeve Maintain airtightness between pieces 22.22. Note that the sleeve fastening member 24 is connected to the band 24
a and back 271. b, and the fastening force can be adjusted.

Furthermore, the gripping hardware 30 is composed of a cylindrical gripping tool 31 and a plurality of (three in the drawings) pressing screw members 32 arranged on the gripping tool 31 at appropriate intervals in the circumferential direction. , respectively fixed to the cable 10.11 within the sleeve 20. As shown in FIG.
It has a two-piece structure divided into parts A and C, which are put over the cable 10 (11) and then integrated with bolts 33. Further, on the side surface of the gripper 31 on the end plate 40 side,
A convex portion 31b is provided which engages and connects the end plate 40. Further, the pressing screw part 32 is screwed into the screw hole 31C of the gripper piece 31a, and is movable in the radial direction of the gripper 31. A presser plate 34 that comes into contact is rotatably provided.

The inner surface of the holding plate 34 is provided with a projection 34a (see FIG. 3) that bites into the outer skin of the cable 10 (11).

Furthermore, the end plate 40 is installed by fitting into the recess 21a (see Fig. 1) provided in the inner surface of the opening 21 at both axial ends of the sleeve 20, and is more suitable than the conventional rubber end plate. A connecting fitting part 43 that is formed of a highly rigid material such as plastic into a disk shape, has a cable through hole 41 in its center, and that the convex part 31b of the gripper 31 fits into the inner surface of the connecting fitting part 43. is provided. This end plate 4
0, two end plate pieces 44.0 each have a semicircular cross section, as shown in FIG. ．． It has a two-piece structure divided into 44 parts, and is integrated by connecting joint parts 4 and 48 provided on the end plate pieces 44 with connecting bolts 45. Here, a recess 44. b, and an end face plate sealing material 46 made of a rubber elastic material is interposed between the recess 44b and the recess 21a. A cable sealing material 47 made of a rubber elastic material is interposed between the circumferential surface of the cable through hole 41 and the outer circumferential surface of the cable 10.11, and a mating surface sealing material 47 is provided between the joint portions 44a and 44a. Material 48
is intervened. This mating surface sealing material /1.8 only needs to fill in minute irregularities on the surface of the joint 4.4a.
Adhesive sealant is used.

Note that a thin adhesive sealing layer is provided on the innermost and outermost sides of the cable sealing material 47, and this adhesive sealing layer protects the surface that comes into contact with the cable sealing material 47 (the circumferential surface of the cable through hole 41, the cable 10° 11 The airtightness may be further improved by filling in small irregularities on the outer circumferential surface of the container.

Next, attach the above cable connection closure to cable 10.1.
The case where it is attached to the connecting portion 12 of No. 1 will be explained.

First, the gripping tool 31 is divided into two gripping tool pieces 31a, 31a.
After dividing into two parts and wrapping them around the cables 10 and 11, the gripping pieces 31a and 31b are connected with bolts 33 and fixed together. Next, each press screw member 32 is equally tightened using a screwdriver or the like set to a predetermined torque, and the press plate 34 is brought into contact with the outer peripheral surface of the cable 10.11. As a result, the protrusion 34a of the holding plate 34 holds the cable 10°1.
The gripping hardware 30 bites into the outer skin of the cable 10.1.
11 is held in place.

Also, the end plate 40 is divided into two end plate pieces 44. Divide it into 10/14 pieces, fit it into the cable 10.11, and connect the connecting bolt 45.
The joint portions 44a are connected to each other by.

At this point, the cable seal material 47 is wrapped around the outer peripheral surface of the cable 10.11 in advance, and when the cable seal material 47 is connected with the connecting bolt 45, the cable seal material 47 receives a compressive force from the highly rigid end plate 40, and this compressive force The cables 10 and 10 are brought into close contact with each other by the elastic repulsive force generated in opposition to the cables 10 and 10, thereby sealing the gap between the cable through hole 41 and the cable 10.11. Further, a mating face sealing material 48 is interposed between the joint parts 448 and 44a, and when the joint parts 448 and 44a are connected by the connecting bolts 45, the joint parts 448 and 44a
a.

Seal the gap between 44a.

Then, cover the sleeve pieces 22 and 22 so that the outer peripheral part of the end plate 40 fits into the recess 21a, and
When the sleeve fastening member 24 is wrapped and tightened from the outside of 2.22, the sleeve pieces 22.22 are integrated, and the end plate sealing material 46 and the sleeve sealing material 23 receive compressive force from the sleeve piece 22. The opposing elastic repulsion forces bring them into close contact, sealing the gaps between the sleeve 20 and the end plate 40 and the gaps between the sleeve pieces 22 and 22.

As a result, the inside of the closure becomes airtight, preventing water, etc. from entering the connecting portion 12 from the outside, and
Prevents sealed pressurized air, nitrogen gas, etc. from leaking to the outside during gas maintenance. And cable io, i”
An external force acts on +, and C also
0, 40 and the sleeve 20 are fixed so that they can be hung so that no external force is applied to the connecting portion 12.

In the cable connection closure of the above embodiment, even if the diameter of the cable 10.11 changes, the gripping hardware 30, the end plate 40
It can be easily covered without replacing.

In other words, regarding the gripping hardware 30, the pressing screw member 32
(the amount of radial movement of the gripping tool 31) can be adjusted, and it is not necessary to prepare a gripping hardware 30 for each cable 10 (11).

In addition, as for the end plate 40, since a cable sealing material 47 manufactured by a rubber elastic material is used, the cable 10 (11) is wrapped around the cable sealing material 47, and the end plate 40 is
Airtightness can be maintained by compressing the seal to ensure a seal contact surface pressure that is higher than the gas pressure inside the seal. For this reason, the end plate 40 provided with the cable through hole 41 of a constant diameter is
It is possible to apply to several types of cables 10 (11) with different diameters, and the end plate 4 is attached to the cable 10 (11) fi.
There is no need to prepare 0.

Therefore, it is possible to reduce the number and types of component parts, thereby reducing production costs.

Moreover, in order to attach the gripping hardware 30 to the cable 10211, it is sufficient to tighten the pressing screw member 32, and the assembly work time can be significantly shortened compared to the prior art.

Furthermore, since the gripping hardware 30 is connected to the end plate 40,
There is no need to connect the gripping hardware with connecting rods, and the space occupied by the connecting rods can be utilized more effectively than in the prior art.

- Regarding the airtight structure between the cable through hole 41 and the cable 10.11, the end plate 40 is made of a highly rigid material, the cable sealing material 47 is made of a rubber elastic material, and the sleeve fastening member 24, but by applying a compressive force from the end plate 40 to the cable sealing material 47 using the fastening force of the connecting bolt 45 that integrates the end plate pieces 44, the cable sealing material 47 is sealed. cm
There is no need for a huge tightening torque, and only a small tightening force is required. Further, regarding the airtight structure between the sleeve 20 and the end plate 40, the end plate seal member 46 is formed from a rubber elastic material, and a compressive force is applied to the end plate seal material 46 by the fastening force of the sleeve fastening member 24. Although the seal is covered, since this sharpened end plate 40 is made of a highly rigid material,
The elastic repulsion 1 of the end plate sealing material 46 is prevented, and similarly, a large fastening force is not required.

That is, the end plate sealing material 46 made of elastic material,
By combining the cable sealing material 47 and the highly rigid end plate 40, the cable through hole 4 is closed using different fastening forces.
1 and cable 10. ``Since the airtightness between the sleeve 20 and the end plate 40 is ensured, only a small tightening force is required, and the assembly workability is superior to the conventional technology.

Also, when the closure is disassembled for reconnection, the end plate sealing material 46 and cable sealing material 47 made of rubber elastic material are used, so the tight contact of the sealing material is difficult as in the prior art. There will be no situation where dismantling becomes difficult.

The end plate 40 and the sleeve 20 may be made of the same material; in this case, the expansion and contraction rates due to temperature changes do not change, which is advantageous in terms of maintaining airtightness.

Further, the gripping tool 31 of the gripping hardware 30 may be formed integrally with the end plate 40 without being connected to the end plate 40.

In addition, since the external force acting on the cable 10.11 is transmitted to the end plate 40, it is required to improve the mechanical strength of the end plate 40 from the material and structural aspects depending on the environmental conditions in which the closure is used. be done. Therefore, in terms of material, it may be made of glass fiber reinforced plastic (FRP) instead of simple plastic. In addition, from a structural point of view, it may be strengthened by providing a bump or the like to cope with stress.

[Effects of the Invention] As explained above, according to the invention of claim (1), the end plate is formed from a material with high rigidity, and the gripping hardware is arranged in a cylindrical gripper at appropriate intervals in the circumferential direction. The structure includes a press screw member that contacts the cable, and an elastic material such as rubber between the joining surfaces of the sleeve pieces, between the cable member and the cable, and between the end plate and the opening of the sleeve. Because it is constructed with a sill material interposed, it has the versatility of being able to be used with different cable diameters, reducing costs, and ensuring airtightness even with a small tightening force.
The efficiency of assembly work can be greatly improved, and furthermore, it does not take much time to disassemble for reconnection.

In connection with ensuring airtightness even with a small tightening force, it has become possible to integrate the sleeve pieces without using bolts as in the prior art. ), which results in
It is not necessary to provide a connecting flange on the sleeve piece and make holes for bolt insertion in this flange, thereby reducing the cost of the sleeve.

Furthermore, since a sealing material made of a rubber elastic material is used, there is no leakage of the sealing material, and there is no need to use a sealing washer as in the prior art.

Further, according to the invention of claim <2>, the gripping hardware is configured to be integrally formed on the inner surface of the end plate, or formed separately and connected to the inner surface of the end plate. Therefore, the connecting rod becomes unnecessary, and the space inside the closure can be used effectively (the effective space for accommodating the core wire is expanded).

Further, according to the invention of claim (3), since the end plate is made of plastic or glass fiber reinforced plastic, the end plate is made of a reinforcing plate (metal plate) against the swelling phenomenon like the end plate made of rubber elastic material. In terms of manufacturing, mass production is possible by plastic molding, and the vulcanization process is also eliminated, so the cost of the end plate can be reduced.

Further, according to the invention of claim (4), since the sleeve and the end plate are made of the same material, they have the same expansion and contraction rates with respect to temperature changes, which is advantageous in maintaining airtightness. Become.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention.
Fig. 1 is a perspective view of the whole with a part cut away, Fig. 2 is an exploded perspective view of the end plate portion, Fig. 3 is a cross-sectional view of the gripping hardware, and Fig. 4 is the A-〆 of Fig. 3. Arrow sectional view, Figures 5 to 7
The drawings show the prior art: FIG. 5 is an exploded perspective view of the entire device, FIG. 6 is an exploded perspective view of the gripping metal part, and FIG. 7 is an exploded perspective view of the end plate part. 10.11... Cable 12... Connection portion 20... Sleeve 21... Opening 22... Sleeve piece 23... Sleeve sealing material 24... Sleeve fastening member 30... Gripping hardware 31...Gripper 32...Press screw member 40...End plate 41...Cable through hole 43...Connection fitting part 46...End plate sealing material 47...Cable sealing material

Claims (4)

[Claims] (1) A sleeve that can be divided into a plurality of sleeve pieces that covers and accommodates a cable connection part, a pair of end plates that have a cable through hole and that fit into openings at both axial ends of the sleeve, and A cable connection closure comprising a pair of gripping metal fittings for gripping a cable to maintain the cable connection part in an airtight state and protect the cable connection part from external force, wherein the end plate has a high rigidity. material, and the gripping hardware is configured by arranging pressing screw members that abut the cable at appropriate intervals in the circumferential direction on a cylindrical gripping tool,
Furthermore, a sealing material made of an elastic material such as rubber is interposed between the joint surfaces of the sleeve pieces, between the cable through hole and the cable, and between the end plate and the opening of the sleeve. Closure for cable connection. (2) Claim (1) characterized in that the gripping hardware is configured to be integrally formed inside the end plate or formed separately and connected to the inner surface of the end plate.
) Cable connection closures listed in ). (3) The cable connection closure according to claim 1, wherein the end plate is made of plastic or glass fiber reinforced plastic. (4) The cable connection closure according to claim (1), wherein the sleeve and the end plate are made of the same material.