JPH0147090B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a connection structure for connecting the sheath of a plastic sheathed cable using a heat-shrinkable plastic sleeve, and particularly to a connection structure that can be disassembled and reconnected relatively easily. Regarding.

(Prior art) (Problem to be solved) Heat-shrinkable sleeves are used to connect communication cables and power cables with plastic sheaths, and a typical example is a heat-shrinkable sleeve made mainly of polyethylene. A method is used in which the cable connection part is placed so as to be wrapped around it, both ends are heat-shrinked to tightly fit it onto the cable sheath, and this tightly adhered part is then heat-fused to make an airtight connection. The structure makes reconnection difficult.

However, in order to easily reconnect cables once they have been installed, when it becomes necessary to reconnect the core wires, a half-split type heat-shrinkable sleeve has been developed. However, since it has a special shape, it takes time and effort to manufacture, and has the drawback of increasing costs.

(Means for Solving the Problems) The present invention was made in view of the above-mentioned circumstances, and uses a heat-shrinkable main sleeve and an auxiliary sleeve having different diameter parts, and connects the small diameter part of the auxiliary sleeve to a cable. This is a connection structure in which the ends are heat-sealed, and the heat-shrinkable main sleeve is heat-shrinked to the middle part adjacent to the large diameter part of the auxiliary sleeve, and the ends are welded.

(Function) Since the structure is as described above, when dismantling the cable connection part and reconnecting it internally, or performing repairs, etc., it is necessary to disassemble the cable connection part and reconnect it internally, or to carry out repairs, etc., immediately near the part where the main sleeve is fused to the auxiliary sleeve. By cutting at the unfused part of the main sleeve, the main sleeve can move freely, and after reconnecting or repairing the inner core wire connection part, the main sleeve can be cut again between the large diameter parts of the auxiliary sleeve. It is possible to seal and reconnect by extending the sleeve over the sleeve and tightly attaching the end portion to the auxiliary sleeve using polyethylene tape, for example, and welding and integrating the sleeve.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. FIG. has been done.

1 shows the connecting portion of the cable core. The structure of the auxiliary sleeve 2 includes a large diameter part 3 that regulates the outer diameter of the main sleeve, a middle part 4 adjacent to the large diameter part 3 to which the end of the main sleeve is fused, and a middle part 4 that is inserted into the end of the cable sheath. It is made of plastic and consists of a small diameter part 5 that is fused. The main sleeve 7 is made of heat-shrinkable plastic made of cross-linked polyethylene, etc., and as shown in the figure, an aluminum foil 8 is pasted inside to enhance the moisture-proofing effect and also have a shielding effect. sleeve 7
is designed not to come into close contact with the surface of the large diameter portion 3 of the auxiliary sleeve 2.

To form the connection structure shown in the figure, the small diameter portion 5 of the auxiliary sleeve 2 is connected to the connection portion 1 of the cable core in advance.
The small diameter portion 5 is fused 6 to the sheath of the cable C. Next, after connecting the cable cores, the heat-shrinkable sleeve (main sleeve 7) that has been fitted onto one side of the cable in advance is pulled back to cover the cable core connection part 1, and the end is heat-shrinked. sleeve 2
It is closely attached to the middle section 4 over the large diameter section 3, and is heat-sealed there.

FIG. 1B shows another embodiment of the present invention, which differs from that shown in FIG. 1A in that aluminum foil is not bonded to the inner surface of the heat-shrinkable sleeve 7. For this reason, the surface of the large diameter portion 3 of the auxiliary sleeve 2 is provided with a non-adhesive layer 9 such as cotton tape wrapping or polyester tape wrapping. Since the same reference numerals are given, the explanation will be omitted.

The connection structure of the present invention is constructed in this manner, and the disassembly and reconnection of the connection structure of FIG. 1A will be described as follows.

That is, as shown in FIG. 2, the main sleeve 7 is cut at the raised end of the heat-shrinked main sleeve 7 between the middle part 4 and the large diameter part 3 of the auxiliary sleeve 2. In the figure, a round cut surface 10 along the end surface of the large diameter portion 3 is shown.
Although the cross section is cut into an L-shape at the plane a and the plane 10b orthogonal thereto, the present invention is not limited thereto.

The main sleeve 1 that has been cut in this way is completely separated from the auxiliary sleeve 2, so it is moved to one side of the cable, the cable cores are repaired, reconnected, etc., and then the main sleeve 1 is completely separated from the auxiliary sleeve 2. It is pulled back to its original position. Next, as shown in FIG.
A plastic tape wrap 11 made of polyethylene, for example, is applied over the remaining welded portion 7a of the main sleeve 7, and the tape is fused and sealed to form a complete connection structure again.

Although FIGS. 2 and 3 show only the left side, the same applies to the right side, and the same parts as in FIG. 1A are given the same reference numerals.

Further, since the matters related to the cutting and reconnection of the main sleeve shown in FIG. 1B can be carried out in accordance with FIGS. 2 and 3, illustrations and explanations thereof are omitted.

(Effects of the Invention) As can be understood from the above embodiments, the connection structure of the present invention is such that the auxiliary sleeve is fused to the cable sheath, and the heat-shrinkable main sleeve is fused to the middle part of the auxiliary sleeve. Since the main sleeve and auxiliary sleeve are long, they can be easily dismantled by cutting the unfused part next to the fused part of the main sleeve and the auxiliary sleeve. After re-connecting, etc., it is possible to put it back on the auxiliary sleeve and seal the end with plastic tape, thereby creating an airtight connection again.

[Brief explanation of drawings]

FIG. 1A is a partially longitudinal sectional front view showing a connection structure of one embodiment of the present invention, B is a left side longitudinal sectional view showing another embodiment of the invention, and FIGS. 2 and 3 are the same as those shown in FIG. FIG. 2 is a vertical sectional front view of the left side when the main sleeve is cut in the connection structure of A, and a vertical sectional front view of the left side when the main sleeve is reconnected. 1...Cable core connection part, 2...Auxiliary sleeve, 3...Large diameter part, 4...Middle section, 5...Small diameter part, 6...Fusion, 7...Main sleeve, 8...Aluminum Foil, 9... Non-adhesive layer, 10a...
Round cut surface, 11b...orthogonal surface, C...cable.

Claims (1)

[Claims] 1 Consists of a large diameter part that regulates the outer diameter of the main sleeve, a middle part adjacent to the large diameter part to which the end of the main sleeve is fused, and a small diameter part that is inserted into and fused to the end of the cable sheath. A plastic auxiliary sleeve is inserted and fused onto the end of the plastic sheathed cable, and a main sleeve made of heat-shrinkable plastic covers the cable core connection and is heated so as to extend between the large diameter portions of the auxiliary sleeve. A sheath connection structure for a plastic sheath cable that is easily disassembled and reconnected, characterized in that the contracted end portion is closely fused to the surface of the middle section of the auxiliary sleeve.