JPH0879958A - Communication cable connection closure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a closure for connecting a communication cable having high water tightness. A communication cable connection closure including a hollow sleeve 2 for accommodating a connection portion 1A of a communication cable 1 and an end face plate 3 airtightly attached to an end portion of the sleeve 2, wherein an inner side of the end face plate 3 is provided. In the vicinity, a closure for connecting a communication cable is formed by disposing a water-absorbing substance 5 densely packed inside a shape retaining case 4 having a large number of small holes on the entire surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication cable connection closure.

[0002]

2. Description of the Related Art Since a connecting portion 1A of a communication cable 1 needs to be protected from the outside in an airtight manner, a conventional closure structure is adopted by the method shown in FIG. 3 or 4. In the structure shown in FIG. 3, the connecting portion 1A is surrounded by a half-cylindrical sleeve 2 and the airtightness at the end face in the axial direction is secured by winding the periphery of the communication cable 1 with a sealing tape 101.

The closure shown in FIG. 4 has a structure in which an end face plate 3 made of a material such as rubber is arranged on the end face of a sleeve 2 for accommodating the connecting portion 1A, and this serves as an airtight packing. is there.

[0004]

The conventional communication cable connection closure described above is mainly used to protect the connection portion of a metal communication cable.
In this case, the pressurized gas is constantly filled inside the closure, and the change in the gas pressure is detected to detect the occurrence of pinholes in the closure or the cable sheath. Therefore, in the above-described conventional communication cable connection closure, intrusion of moisture from the outside could be relatively easily prevented by the gas pressure inside. However, since the optical fiber cable does not contain gas inside, it is necessary to secure the watertightness by the sealing itself on the end face plate. In this respect, the conventional sealing structure has some anxiety about the watertightness. .

[0005]

The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is a hollow sleeve for accommodating a connection portion of a communication cable, and the sleeve. A connection closure for a communication cable, which is provided with an end face plate that is airtightly attached to an end portion, in which a water absorbing substance is disposed in the vicinity of the inside of the end face plate.

According to a second aspect of the present invention, the water-absorbing substance contains powdery calcium carbonate as a main component, and the water-absorbing substance is contained in a shape-holding case having a large number of small holes. It is a closure for connecting the communication cable of.

[0007]

[Function] Even if some of the moisture from the outside passes through the face plate and enters the inside of the closure, these are absorbed by the water-absorbing substance inside the shape-holding case located close to the inside of the end face plate. Moreover, since the water-absorbing substance expands due to this water absorption, the sealing effect as the packing is enhanced and the subsequent water infiltration is prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus according to an embodiment of the present invention will be described with reference to FIG. Reference numerals 1, 2 and 3 denote communication cables, closure sleeves and end plates, respectively, as in FIGS. 3 and 4, except for the elements designated 4 and 5 in this FIG. It is the closure structure itself for connecting cables.

In the present invention, a shape-retaining case 4 having a substantially hollow disk shape is arranged near the inside of the end face plate 3. The shape holding case 4 has a shape similar to that of the end face plate 3, and is disposed by fitting a groove inside the sleeve 2 so as to perform a packing action.

As shown in FIG. 2, the shape-retaining case 4 is formed into a hollow disk shape with, for example, a synthetic resin, and a large number of small holes 41 are formed on the entire surface. However, the shape-holding case 4 is densely filled with a powdery or granular water-absorbing substance 5 such as calcium carbonate or silica gel. In other words, in other words, this has the same meaning as forming a packing with such a water-absorbing substance 5 as a whole, and the name of "shape-retaining case" also comes out from here.

Instead of the large number of small holes 41 of the shape retaining case 4, a mesh plate having a fine mesh may be used. Further, the water-absorbing substance 5 may be directly arranged in close proximity to the inside of the end face plate 3 without using the shape holding case 4 as shown in FIG.

[0012]

According to the first aspect of the present invention, even if there is something that may pass through the face plate and enter the inside of the closure by moisture from the outside, these are located close to the inside of the end face plate. It is absorbed by a water-absorbing substance and has a sufficient waterproof effect to keep moisture from coming into contact with the connection part inside the closure.

According to the second aspect of the invention, since the water-absorbing substance filled in the inside is expanded by absorbing the moisture as described above, the sealing effect as the packing of the shape-holding case is enhanced, and the subsequent moisture infiltration. There is an advantage that it is more surely prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a shape-retaining case used in the present invention and a water-absorbing substance filled therein.

FIG. 3 is a side sectional view illustrating the configuration of a conventional communication cable connection closure.

FIG. 4 is a side cross-sectional view illustrating the configuration of a conventional communication cable connection closure.

[Explanation of symbols]

 1 Communication cable 1A Cable connection part 2 Sleeve 3 End face plate 4 Shape holding case 41 Small hole 5 Water absorbing material

Claims (2)

[Claims] 1. A hollow sleeve (2) for accommodating a connecting portion (1A) of a communication cable (1), and the sleeve (2).
A connection closure for a communication cable comprising an end face plate (3) airtightly attached to the end of the communication cable, wherein a water absorbing substance (5) is arranged near the inside of the end face plate (3). Closure for connection. 2. The water-absorbing substance (5) is mainly composed of powdery calcium carbonate, which is contained in a shape-retaining case (4) having a large number of small holes (41). A closure for connecting a communication cable according to item 1.