JPS5849990B2 - Method for manufacturing heat-shrinkable plastic auxiliary sleeve for cable connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a heat-shrinkable plastic auxiliary sleeve for connecting cables, which is mainly used when connecting cables or branching the ends of cables.

Recently, a method shown in FIG. 1 has been proposed as a cable connection method.

According to this method, the core wire connection part 3 of the cable 1 and the cable 2 is covered with the main sleeve 4, and the heat-shrinkable plastic auxiliary sleeves 5, 5 disposed at both ends of the main sleeve 40 are heat-shrinked to cover the cable 1 and the cable 2. , 2 in close contact with the sheath part.

Therefore, even if the cables have different outer diameters, the connection work can be performed without any problem, and the core wire connection portion can be sufficiently sealed.

By the way, the heat-shrinkable plastic auxiliary sleeve 5 is composed of a bottomed cylindrical base 5a and a heat-shrinkable plastic sleeve portion 5b, which are simultaneously molded integrally by extrusion or injection molding, and It is manufactured by expanding it and fitting it into a mold to make it heat-shrinkable.

For this reason, there are problems in that it is time-consuming and the manufacturing cost increases.

Therefore, a method has been proposed in which the base and the heat-shrinkable sleeve are molded separately, and then one end of the heat-shrinkable plastic sleeve is inserted into a mounting hole formed on the bottom of the base and fixed with adhesive or the like. has been done.

However, even in this case, there are problems such as the work of fixing using adhesive is troublesome and the airtightness of the fixing part is not sufficient.

The present invention has been made in view of the above circumstances, and its purpose is to provide a cable connection that is easy to manufacture and has sufficient airtightness at the connection between the base and the heat-shrinkable plastic sleeve. An object of the present invention is to provide a method for manufacturing a heat-shrinkable plastic auxiliary sleeve.

That is, in the present invention, a heat-shrinkable plastic sleeve is molded in advance, and one end of the heat-shrinkable plastic sleeve is attached to the bottom of the base during molding of the base. It is characterized by being embedded and melted into one piece so that the inside of the stand communicates with each other.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows the heat-shrinkable plastic auxiliary sleeve 10 of this embodiment.

As shown in FIG. 3, the heat-shrinkable plastic sleeve portion 11 of the heat-shrinkable plastic auxiliary sleeve 10 is
It is constructed by providing a translucent heat-sealing layer 13 made of uncrosslinked polyethylene on the inner peripheral surface of a heat-shrinkable material 12 having a two-layer structure consisting of a semitransparent inner layer 12a made of crosslinked polyethylene and a black outer layer 12b.

Note that at one end of this heat-shrinkable plastic sleeve portion 11, the heat-shrinkable layer 12 is removed and the heat-sealing layer 13 protrudes, and at the other end, the outer layer 12b of the heat-shrinkable layer 12 is removed.
The inner layer 12a and the heat sealing layer 13 protrude.

This protrusion becomes transparent when heated, so that the state of fusion with the cable sheath can be seen through.

One end portion (thermal adhesive layer 13) of the heat-shrinkable plastic sleeve portion 11 is attached to the base 14 at the same time when the bottomed cylindrical base 14 is extrusion molded or injection molded from plastic.
It is embedded in the bottom surface 14a of 4 and melted and integrated.

To explain this in detail with reference to FIG. 4, when molding the base 14, one end of the heat-shrinkable plastic sleeve portion 11 is inserted into the mold 15 of the base 14 via the support rod 16. By inserting and fixing, the one end is heated and melted by the plastic injected into the molding die 15, and the base 14 is heated and melted.
At the same time as the molding of It is embedded and melted and integrated in this way.

The heat-shrinkable plastic auxiliary sleeve 10 constructed as described above is used for connecting cables as shown in FIG.

Note that FIG. 5 shows a case where the main cable 20 and the branch cable 21 are connected, and one end of the main sleeve 23 (left side in FIG. ) is provided with a heat-shrinkable plastic auxiliary sleeve 10 having one heat-shrinkable plastic sleeve portion 11, and the other end (right side in FIG. 5) is provided with two heat-shrinkable plastic sleeve portions 11. A heat-shrinkable plastic auxiliary sleeve 10 is provided.

Then, the heat-shrinkable plastic sleeve portion 11 of each heat-shrinkable plastic auxiliary sleeve 10 is heat-shrinked by an appropriate heating means such as a burner, and is brought into close contact with the sheath portions of the main cable 20 and the branch cable 21.

In particular, when the sheath part is made of polyethylene, the heat-shrinkable sleeve part 11 is heat-shrinked and the heat-sealing layer 13 is heat-sealed to the sheath part.

In this case, since the end portion consisting of the heat-shrinkable inner layer 12a and the heat-sealing layer 13 is heated and becomes translucent, it can be confirmed whether the heat-sealed inner layer 12a and the heat-sealing layer 13 are completely heat-sealed to the sheath portion.

Furthermore, the heat-shrinkable plastic auxiliary sleeve 10 is similarly used when branching the ends of a cable.

In the above embodiment, one or two heat-shrinkable plastic sleeves 11 are provided on the bottom surface 14a of the base 14, but the present invention is not limited to this, and three or more heat-shrinkable plastic sleeves 11 may be provided. Of course.

As explained above, according to the present invention, when a bottomed cylindrical base is molded from plastic, one end of a preformed heat-shrinkable plastic sleeve is attached to the bottom of the base using a heat-shrinkable plastic sleeve. The inside and the inside of the base are embedded and fused together so that they communicate with each other.

Therefore, compared to the case where the base and the heat-shrinkable plastic sleeve are integrally molded at the same time and are later made heat-shrinkable, the manufacturing process is much simpler and the manufacturing cost can be reduced.

Furthermore, manufacturing is simpler than in the case where the heat-shrinkable plastic sleeve is fixed to the base using fixing means such as adhesive, and there is no problem with airtightness at the connection portion.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted sectional view explaining the cable connection method, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a side view, and Fig. 3 is a heat shrinkable FIG. 4 is a partially cutaway side view of the plastic sleeve portion, FIG. 4 is a partially cutaway sectional view illustrating a manufacturing method, and FIG. 5 is a partially cutaway sectional view showing an example of use. 10...Heat-shrinkable plastic auxiliary sleeve. 11...Heat-shrinkable plastic sleeve part, 1
4...Base, 14a...Bottom.

Claims (1)

[Claims] 1. When a bottomed cylindrical base is molded from plastic at one end of the pre-formed heat-shrinkable plastic sleeve part, the inside of the heat-shrinkable plastic sleeve and the inside of the base communicate with each other on the bottom surface of the base. A method for manufacturing a heat-shrinkable plastic auxiliary sleeve for cable connection, characterized by embedding and melting and integrating the sleeve.