JPS6029294Y2 - Connection case for local termination - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intra-office connection case used in an intra-office cable sheath connection method.

Broadly speaking, branch connection methods for plastic sheathed station cables can be divided into the mechanical joint method and the resin filling method. The disadvantage is that it is not reliable, and while the latter can be easily sealed all at once by filling it with resin, airtightness is maintained by the adhesive strength or adhesion between the resin and the cable surface. It was difficult to do so, and the length of the cable in the part to be filled with resin needed to be long to some extent.

This invention was made in view of the above situation, and provides a connection case for in-office termination that uses a resin compound and mechanical airtight means to ensure airtightness within the cable and the case.

Next, an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a partial vertical sectional view of the connection case of the present invention attached to the cable end, and shows an airtight chamber at the sheath end of the cable 1. A cylindrical portion 2 made thin at one end of the forming cylindrical body A is fitted, and this cylindrical portion is airtightly attached using a sealing means 4 such as a shrink tube or adhesive tape.

Each cable core of this cable 1 is an in-office cable 5.
This internal cable is inserted through the internal cable that is drilled through the internal cable fixing plate B, which is placed on the top of the thick cylindrical part 3 of the airtight room forming cylinder A. The insertion hole 6 is usually provided with a diameter adjusting collar 7 so that the diameter can be adjusted according to the outer diameter of the intra-office cable.

Inside this internal cable fixing tray B, the area around the internal cable is filled with a resin 8 that maintains elasticity by curing, such as a urethane-based two-component hardening resin.

Furthermore, a lid C for urging the surface of this resin 8 is installed on top of this.

This cover C is provided with an insertion hole 9 corresponding to the intra-office cable insertion hole 6 provided in the intra-office cable fixing plate B, through which each intra-office cable is inserted.

Further, this insertion hole 9 is also provided with a diameter adjusting collar 10, and each of the cylinder body A for forming an airtight chamber, the dish body B for fixing an internal cable, and the lid body C has a flange portion A'.

In B' and C', the tightening member 9, for example, the tightening bolt 1
1 and a spring-loaded tightening bolt 12, the area around the internal cable is compressed airtight due to the elasticity of the compound, and the gas valve 1 of the cylinder A for forming an airtight chamber is tightened.
If the cable is filled with dry air from step 3, the cable and the airtight chamber will be kept dry, allowing the cable to perform its gas maintenance function as is.

Note that a gas valve cap 14 is provided.

FIG. 2 is a top view showing an example of the lid C, which has a plurality of internal cable insertion holes 9 and one resin injection hole 9a. Usually, the resin is injected and hardened after the lid C is installed. Ru.

11 is a normal tightening bolt 12 is a spring-loaded tightening bolt.

FIG. 3 is a partial vertical cross-sectional view showing an example of the structure of the inner tightening part of the connection case of the present invention, in which the internal cable 5 is fitted with a fine adjustment collar 10 in the cable insertion hole 9 of the dish body B and the lid body C. The space between the plate body B and the lid body C is filled with resin and hardened.

Then, the flanges A', B', and C' of the airtight chamber forming cylinder A1, the plate body B, and the lid C are tightened with spring-loaded tightening bolts 12 such as disk springs, and the airtight chamber forming cylinder A An O-ring 15 is provided on the flange part A' to ensure airtightness of the flange part, and the resin is elastically tightened by the tightening and compression action of the spring-loaded bolt, so that the inside of the cylinder A for forming an airtight chamber is completely sealed. kept airtight.

The bending point of the fine adjustment collar and the internal cable are sealed with putty or adhesive 16 to prevent resin from leaking during resin injection.

As described above, the present invention realizes the two features of a mechanical joint and a resin-filled joint with a simple structure, and makes it possible to obtain a simple and reliable connection part for the sheath connection of a multi-branch cable. In addition to the collective sealing, the effect of the elastic body after the resin hardens and the ability to constantly apply pressure to the elastic body by the lid C have the advantage of ensuring airtight reliability over a long period of time.

[Brief explanation of drawings]

Figure 1 shows a partial longitudinal section of the connecting case of the present invention attached to a cable termination, Figure 2 is a top view of the lid, and Figure 3 shows the structure of the inner tightening part of the connecting case of the present invention. FIG. A: Cylindrical body for forming an airtight chamber, B: Cable fixing plate, C:
Lid body, D: tightening member.

Claims (2)

[Scope of utility model registration request] (1) A cylindrical body A for forming an airtight chamber consisting of a thin cylindrical part that is fitted onto the outer sheath of the end of the main cable, and a thick cylindrical part that covers the ends of a plurality of internal cables branched from the main cable; A dish-shaped internal cable fixing dish body B that is fitted into the open end of a thick cylindrical part, has holes through which the internal cables are individually inserted, and can be filled with a compound around the internal cables; It is placed on the fixing plate B and consists of a lid C having holes through which the internal cables are individually inserted.
A connecting case for local termination in which each of the flange portions A', B' and C' is elastically supported by a tightening member. (2) The connection case for local termination according to claim 1, wherein the tightening member is a bolt with a spring.