JPS5920251B2 - How to form a filled cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a filled type cable connection part in which a core connection part that connects core wires is covered with an outer shell, and the outer shell is filled with a filler such as a waterproofing compound. This relates to a method of forming.

Recently, for the purpose of improving the waterproofness of the connection part, the outer periphery of the core connection part is covered with an outer shell, and a waterproof mixture or the like is filled therein as a filler.

As methods for forming this type of filled-in type cable connection portion, methods such as (a) and (b) described below have been proposed.

Method (a) A packing is attached to the outer periphery of the cable, a two-part plastic molded outer shell is attached via the packing, and a filler such as a waterproofing mixture is filled through an injection port provided in the molded outer shell.

Method (b) A thin plastic sheet is wound around the core connection part to form a thin plastic sheet outer shell, and a filler such as a waterproofing mixture is filled through an injection port provided in the outer shell.

However, in both methods (a) and (b), it is necessary to have a see-through outer shell so that the internal state can be observed while the filling material is being filled. When used in environments exposed to sunlight, it is necessary to take measures to block sunlight to prevent deterioration, which not only increases the labor involved but is also uneconomical.

In addition, in both methods (a) and (b), it is necessary to provide an injection port in the outer shell, and this injection port must be sealed after the filler is injected. If there is, the waterproofness of the outer shell will be reduced.

If the structure allows moisture to infiltrate into the outer shell, the filling material will not only have a waterproofing effect on the connection points of the core wires, but the filling material itself will not deteriorate due to water. It must also have good chemical resistance and oil resistance against substances such as chemicals and oil that mix with water and enter, so the range of fillers that can be applied is limited. It will be limited.

As a result, it is undeniable that it is generally disadvantageous in terms of economy.

Next, method (a) requires an outer shell made by injection molding, etc., which requires extensive manufacturing equipment to manufacture the outer shell, and requires the use of small quantities of different types of outer shells. It has the disadvantage of being economically unsuitable for application to connections.

Furthermore, method (b) has the disadvantage that it is difficult to make the joints of thin plastic sheets completely waterproof.

The present invention proposes a method for forming a filled-in type cable connection part that can be formed by improving the various drawbacks of the conventional method as described above, and will be described in detail below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, in forming the filled-in type cable connection part according to the present invention, both sides to be connected (
The sheath 2 of the cable 1 (one of which is not shown) is peeled off to expose the cable core 3, and the core wires of both cable cores 3 are connected to each other to form the core connection part 4.

On the other hand, on the cable sheath 2 on both sides of the core connection part 40,
The two end blocks 6 are each fitted with a sealing material 5 interposed therebetween, and the outer periphery thereof is tightened and fixed with a tightening fitting 7, a tightening bolt 8, and a NAND (not shown).

In addition, a sheath retaining fitting 9 is tightened and fixed on the cable sheath 2 at a position near the core connection part 4 with a retaining bolt 10 and a nut 11, and this sheath retaining fitting 9 is bolted to the protrusion 7A of the tightening fitting 1. 12 and a nand (not shown), the cable sheath 2 is fastened to the tightening fitting T.

The clamping fittings 1 on both sides of the core connection part 40 are connected by a tension member 13 so that even if tension is applied to the cable 1, the tension does not act on the core connection part 4.

A sealing groove 14 is provided on the outer periphery of the end block 6, and sloped portions 15 are provided at both edges of the sealing groove 14 on the entrance side.
has been established.

A composite sealing material 16 is provided on the outer periphery of the end block 6 as a sealing material that can be reduced in diameter to correspond to the sealing groove 14.
is wrapped around it.

As shown in FIG. 3, this composite sealing material 16 has a structure in which an elastic inner layer 16a made of an elastic material such as rubber is provided with a viscous outer periphery 16b made of unvulcanized or low-vulcanized rubber around the outer circumference of the elastic inner layer 16a. .

The outer diameter of the elastic inner layer 16a of such a composite sealing material 16 is selected to be equal to the width of the entrance of the sealing groove 140, and the outer diameter of the viscous outer layer 16b is selected to be slightly larger than the width of the entrance of the sealing groove 140.

Therefore, the composite sealing material 16 rests on the inclined portions 15 on both sides of the sealing groove 14 until a predetermined pressure is applied.

The single-split internal cylindrical outer shell 17 surrounding the core connection portion 4 is placed over both end blocks 6 around which the composite sealing material 16 is wound in this way.

This single-split inner cylindrical outer shell 1T has a cylindrical shape as shown in FIGS. 4 and 5, and a split opening 18 is provided along the longitudinal direction at one location in the circumferential direction. Lip portions 19 and 19 are integrally formed on both edges of 18.

The inner diameter of the outer shell 17 is an inner diameter d that is approximately equal to the outer diameter of the end block 6 in an unexpanded state.

has been selected. In the state before filling with the filler, the outer shell 1
7 is supported on a composite sealing material 16 having an outer diameter d, so its inner diameter is the normal inner diameter d.

It has been enlarged to a larger inner diameter d.

Therefore, in this state, the outer shell 17 has the split opening 18 open as shown in FIG. 4, and both ends thereof are closed with the end block 6 and the composite sealing material 16 on its outer periphery.

A filler 20 such as a waterproofing mixture is filled into the inside of the outer shell 17 in an expanded diameter state through the open split opening 18 .

At this time, the filling state can be fully observed through the open slot 18.

Therefore, the outer shell 17 does not need to be made of a see-through material, and can be made of a material with excellent weather resistance, such as polyethylene containing carbon, for example.

After filling the outer shell 17 with the filler 20, a sealant 21 is interposed between the lip portions 19 and 19,
The lip portion 19.19 is sealed by tightening with a pair of fasteners 22.22 disposed on both sides thereof and a tightening screw 23 that passes through one of these fasteners 22.22 and is threaded into the other.

When the lip portion 19.19 is tightened, the tightening force causes the outer shell 17 to contract in diameter.

At this time, a diameter-reducing force also acts on the composite sealing material 16 via the outer shell 17, and a portion of the composite sealing material 16id falls into the sealing groove 14 due to this diameter-reducing force.

In this case, as described above, the composite sealant 16 has a structure in which the core is the elastic inner layer 16a and the outer periphery is provided with the soft viscous outer layer 16b, so the viscous outer layer 16b flows due to pressure and the sealing groove 14 and the outer shell 17 are connected. Filling the gap formed, the elastic outer layer 16a falls into the sealing groove 14 together with a part of the viscous outer layer 16b.

The space between the outer shell 17 and the end block 6 is completely sealed with the composite sealing material 16 which is thus deformed and closes the gap.

Note that the sealing material that can be reduced in diameter is not limited to the composite sealing material 16 as shown in FIG.
It may be made of only a simple adhesive material.

Further, as shown in FIG. 1, a tapered sealing material 24 protruding from the outer periphery of the end of the end block 6 can be used.

In this case, it is necessary to separately arrange a sealing material 25 such as a composite sealing material or 01J ring around the outer periphery of the end block 6.

As explained above, in the method for forming a filled cable connection part according to the present invention, the outer shell covering the outer periphery of the core connection part has a cylindrical shape and is split along the longitudinal direction at one point in the circumferential direction. A single-split concave cylindrical outer shell with a spout is used, and the diameter of this outer shell is enlarged to fill the filler with the spout open, so the filling state can be observed through the open spout.

Therefore, this cylindrical outer shell does not need to be made of a material that can be seen through, but can be made of an opaque material such as a material with excellent weather resistance. There is no need to perform a process to shut off the power, which saves time and effort, and is economical.

In particular, since the method of the present invention uses a sealing material that can be reduced in diameter, it can be used even when the diameter of the single-split concave cylindrical outer shell is expanded to open the split opening, or when the diameter is reduced and the split opening is opened. Even when the tube is closed, both ends can be sealed to accommodate changes in diameter, which is extremely beneficial in terms of workability.

Further, according to the present invention, there is no need to provide a special injection port in the outer shell, and the waterproofness and reliability of the outer shell can be sufficiently improved, and the degree of freedom in selecting the filling material can be increased. .

Furthermore, the outer shell can be manufactured by rolling a sheet, etc., which is advantageous in terms of production equipment, and can also be economically adapted to cable connections using a small number of different types of outer shells.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side view showing an example of a filled-in cable connection manufactured by the method of the present invention, and FIG. 2 is a cross-sectional view showing the sealed state of the outer shell lip of this connection. , Fig. 3 is a vertical cross-sectional view showing the relationship between the end block used in this example and the sealing material that can be reduced in diameter, and Figs. 4 and 5 are views showing the diameter expansion of the outer shell used in this example. Fig. 6 is a longitudinal sectional view of the outer shell fastener used in this embodiment, and Fig. 1 is a cross-sectional view showing another embodiment of the end block and the sealing material that can be reduced in diameter. FIG. 3 is a partially cutaway side view. DESCRIPTION OF SYMBOLS 1... Cable, 4... Core connection sound barrier 6... End block, 14... Sealing groove, 16... Composite sealing material as a sealing material capable of diameter reduction, 16
a... Elastic inner layer, 16b... Viscous outer layer, 17...
Single split concave cylindrical outer shell, 18... split opening, 20... filler, 24... tapered sealing material as a sealing material that can be reduced in diameter.

Claims (1)

[Claims] 1. In a method for forming a filled cable connection part, in which both ends of an outer shell surrounding a core connection part are closed with end blocks and a filler is filled therein, the outer shell has a cylindrical shape, and the outer shell has a cylindrical shape, and Using a single-split cylindrical outer shell having a split opening along the longitudinal direction at one location, the diameter of the outer shell is expanded at the outer periphery of the core connection part to open the split opening, and the outer shell is expanded in diameter. The gap between the shell and the end block is filled with a sealing material that can be reduced in diameter, and the filler is filled from the split opening of the outer shell in the enlarged diameter state, and after filling is completed, the sealing material is reduced in diameter and the outer shell is 1. A method of forming a filled-type cable connection part, characterized in that the shell is reduced in diameter to close the split opening.