JPH0323799Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a communication cable connecting portion used for connecting a gas-filled communication cable filled with pressurized gas, for example.

[Prior art and its problems]

In communication cables that require gas maintenance, pressurized air or nitrogen gas is sealed inside the cables, so it is necessary to prevent gas leakage from the connections. For this reason, conventionally, to construct the above-mentioned cable connections, airtight construction methods such as auxiliary lead pipe construction method using heat, GS cable construction method, heating wire fusion construction method, see-through fusion construction method, etc., or purely mechanically, sealing tape was used. Airtight construction methods are used.

However, these conventional airtight construction methods for connecting cables are complicated and require heat, or require wrapping multiple layers of highly adhesive sealing tape, making the work difficult. Moreover, there were drawbacks such as the fact that it was impossible or extremely difficult to disassemble the seal portion for reconnection. Furthermore, there are construction methods that use non-adhesive sealing materials to compensate for these drawbacks of conventional methods, but the flow of the sealing material and the expansion of the auxiliary lead pipes can cause cable defects, so over a long period of time the connections become airtight. There were disadvantages such as a lack of reliability, such as poor performance and gas leaks.

[Purpose of invention]

This idea was made in view of the above circumstances,
The object of the present invention is to provide a communication cable connection part that has a simple structure, is easy to construct and disassemble, and has excellent airtightness and high reliability.

[Structure of the idea]

The communication cable connection part of this invention consists of a connection box that covers the conductor connection point of the communication cable from the periphery, and an annular end plate interposed between the communication cable and the inner peripheral surface of both ends of the connection case. and a sealing material that seals between the end plate and the communication cable and between the end plate and the connection case, and the end plate is made of an elastic body with greater rigidity than the sealing material and is used for connection. It is characterized by a slit being formed in communication with the inside of the container.

[Effect]

The connection part of the communication cable of this invention closes the space between the communication cable and the connection case with a relatively rigid end plate, and seals the gap between the connection case and the connection case. When pressure is applied inside, the end plate is pushed out from the slit in the radial direction by the pressure, and the sealing materials on the outer and inner peripheries of the end plate can be brought into close contact.

〔Example〕

FIGS. 1 and 2 show an example of the connection portion of the communication cable of this invention.

1 and 2, each conductor 2 of the cable 1 to be connected is connected to each conductor of a mating cable (not shown) at a conductor connection point 3, respectively. A pair of end plates 5 are placed on the jacket 4 of the cable 1 sandwiching the conductor connection point 3 therebetween.
(The one on the cable sheath of the other party is not shown.) are arranged facing each other.

The end plate 5 has a substantially disk-like appearance, and is formed by integrally joining semicircular disk-shaped half-split bodies 6, 6 made of an elastic material with a large amount of deformation, such as rubber. Here, the half bodies 6, 6 located at the center of the end plate 5
A through hole 7 having an inner diameter slightly larger than the outer diameter of the cable 1 is bored along the axial direction in the center of the opposing surface. Further, a plurality (five in the figure) of annular grooves each having a semicircular cross section are formed along the circumferential direction on the inner circumferential surface of the through hole 7 of the half bodies 6, 6. An annular protrusion 8 is formed between them. Furthermore, the above-mentioned half body 6,
Thick cylindrical half-split bulges 9 are formed on both end faces of the cylindrical parts 6, respectively, and bulge outward along the axial direction by a predetermined length, and are opposed to each other. The half bodies 6, 6 are each disposed oppositely on the outer sheath 4 of the cable 1 via an adhesive sealing material 10 such as an unvulcanized rubber tape wound around the outer sheath 4 of the cable 1, They are integrally connected by bolts 11 and nuts 12 provided on each bulge 9.

Further, the conductor connection point 3 is located at a predetermined distance radially outward from the inner peripheral surface of the half body 6.
The end face 13 of the bulging part 9 located on the side has a cut 14, and the axial direction is directed inward from the cut 14 of the end face 13 to a position slightly beyond the center of the half body 6 in the axial direction. A slit 15 is formed. As shown in FIG. 2, this slit 15 is formed in an arc shape with a cut end 14 extending outward from the inner circumferential surface of the half body 6 and drawing a substantially semicircular shape with a predetermined radius along the inner circumferential surface. has been done.

Furthermore, annular protrusions 16 along the circumferential direction are provided at both ends in the axial direction of the outer peripheral surfaces of the half bodies 6, 6 of the end plate 5,
16 are formed. Here, the protrusion 16,1
A sealing material 17 similar to the sealing material 10 is also wound around the outer periphery of the end plate 5 on which the sealing material 6 is formed. A connection case 18 is provided on the outer periphery of the end plate 5 with the sealing material 16 interposed therebetween.
This connection box 18 has a substantially cylindrical appearance, and is made up of half bodies 19, 19 divided into two equal parts along the axial direction and integrally joined by bolts 20 and nuts 21. . At the end of the connection box 18 and at a position slightly longer than the width of the end plate 5 from this end along the axial direction, there are annular shapes projecting radially inward. Locking protrusions 22, 22 are formed. The connection case 18 is attached to the outer periphery of the end plate 5 so as to sandwich the outer periphery of the end plate 5 between the locking protrusions 22, 22. The other end (not shown) of the connection case 18 is similarly attached to the outer periphery of an end plate provided on the other cable jacket. As a result, the conductor connection point 3 covered with the connection case 18
A space 23 is formed around the connection box 18 and the end plate 5.

In the communication cable connection section configured in this manner, when a maintenance gas such as air or nitrogen gas is pressurized and sealed into the cable 1, the outer sheath 4 is peeled off and the exposed conductor connection point 3 is passed through the space above. 23 is also filled with the gas, and the inside of the connection case 18 is pressurized to the same pressure as the inside of the cable 1. Then, the gas pressure inside the connection box 18 acts to spread the gap between the slits 15 of the highly flexible end plate 5 from the cut 14 into the slits 15. As a result, the end plate 5 expands toward the outer circumference and the inner circumference, so that the protrusions 8..., 16... formed on the inner and outer circumferential surfaces of the end plate 5 are formed by sealing material 1, respectively.
0 and 17, the cable 1 is tightly adhered to the outer sheath 4 of the cable 1 and the inner peripheral surface of the connection case 18, so that the inside of the connection case 18 is kept airtight.

However, according to such a connection part of a communication cable, the pressurized gas inside the connection case 18 expands the end plate 5 from inside the slit 15 in the inner and outer circumferential directions, and the inside of the connection case 18 expands. Since the sheath 4 of the cable 1 is hermetically sealed, even if creep deformation or the like occurs in the outer sheath 4 of the cable 1, the airtightness does not deteriorate and high airtightness can be maintained. Moreover, it is only necessary to form the slits 15 in the end plate 5, and the structure thereof can be made extremely simple. Therefore, construction and disassembly are easy, and reconnection of the cable 1 can therefore be made easy.

Further, an annular protrusion 8 is formed on the inner and outer peripheral surfaces of the end plate 5.
..., 16... are provided, the sealing effect between the contact surfaces increases and higher airtightness can be obtained.

[Effect of idea]

As explained above, in the connection part of the communication cable of this invention, the gas pressure inside the connection case expands the end plate from inside the slit in the inner and outer circumferential directions, causing the sealing material to come into close contact with the inside of the connection case. Since it is sealed for a long time, high airtightness can be maintained for a long period of time. In addition, the structure is extremely simple, and it is easy to install and disassemble, making it easy to reconnect cables.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the communication cable connection part of this invention, with Figure 1 being a side sectional view of the main part, and Figure 2 being a - line view of Figure 1. . 1...Cable, 3...Conductor connection point, 4...
Outer cover, 5... end plate, 13... end face, 14... cut, 15... slit, 18... connection case.

Claims (1)

[Scope of utility model registration request] A connection box that covers the conductor connection point of the communication cable from the surrounding area, an annular end plate interposed between the inner peripheral surface of both ends of the connection case and the communication cable, and a connection between the end plate and the communication cable. and a sealing material for sealing between the end plate and the connection case, and the end plate is made of an elastic body having greater rigidity than the sealing material and communicates with the connection case to form a slit. Connecting part of communication cable.