JP2765789B2 - Cable with moisture-proof dam - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal communication cable, and more particularly to a cable with a moisture-proof dam.

[0002]

2. Description of the Related Art FIG.
The cable sheath 2 which is a jacket of the moisture-proof dam mounting portion 10 is stripped off, and a large number of core wires 3 are exposed to increase the interval between the core wires 3. Then, the sleeve 11 was attached thereto, and the room-temperature curing resin 7 was injected between the core wires 3 in the sleeve 11 to produce the moisture-proof dam portion 12.
When the room temperature setting resin 7 is injected into the sleeve 11, the area of the air is large, so that the room temperature setting resin 7 easily flows into the sleeve 11 and is easily replaced with the air inside the sleeve 11. For this reason, the room temperature curing resin 7 is sufficiently filled in the space 3 between the cords, so that the room temperature curing resin 7 can have a moisture proof property or a gas tightness.

[0003]

By the way, in the case of manufacturing the above-mentioned moisture-proof dam portion, the cable sheath is peeled off, the sleeve is covered, the space between the cords is widened, and the gap is filled with a room temperature curing resin to prevent the moisture. However, there is a problem that an extra mounting space is required for the length of the sleeve because a sleeve having a larger diameter than the cable is mounted.

[0004] For this reason, if the room temperature curing resin can be filled between core wires inside the cable sheath without peeling the cable sheath, an extra length space is not required for the moisture-proof partition. However, since the gap between the core wires may be extremely small, even if an attempt is made to fill the room temperature setting resin with the room temperature setting resin, it is difficult to replace the air in the cable and the room temperature setting resin due to the fluidity of the resin. Unreplaced air remains and an internal pressure is applied, and only a small amount of resin flows into the cable sheath, so that the reliability of the moisture-proof effect is lacking.

An object of the present invention is to provide a cable with a moisture-proof dam which can solve the above-mentioned problems of the prior art and can manufacture a moisture-proof dam portion without requiring an extra mounting space. .

[0006]

In order to achieve the above object, a cable with a moisture-proof dam according to the present invention has a multi-core air vent tube having a plurality of air vent holes between the cores of the cable. The cable sheath is filled with a room temperature curing resin between core wires inside the cable sheath.

In the present invention, examples of the material of the room-temperature-curable resin include polyurethane, rubber, epoxy-based compounds and jelly-like compounds having good adhesiveness, and have soft flexibility and insulating properties with flexibility. Anything should do.

The material of the tube is plastic,
Rubber, tetrafluoride resin, and the like may be used as long as they have flexible soft hardness and insulating properties.

The method of filling the room temperature curing resin includes natural injection, press-fitting, and vacuuming.

[0010]

The air vent tube having a plurality of air vent holes between the cores of the multi-core cable extends over the entire length of the cable, so that air between the cores in the cable sheath at any position can freely flow through the cable. Get out of the For this reason, even if the room temperature curing resin is filled between the core wires without peeling the cable sheath, the air in the cable comes out through the air vent tube, so that a necessary amount of the room temperature curing resin is added to the core inside the cable sheath. It can be filled between lines. Therefore, it is possible to manufacture the moisture-proof dam portion without requiring an extra mounting space.

[0011]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a multi-core (multi-core including multi-pair) cable, and a core 3 of a cable sheath 2 thereof.
An air bleeding tube 5 having a plurality of air bleed holes 4 (see FIG. 2) therebetween is inserted over the entire length of the cable 1.

As shown in FIG. 2, the air bleeding tube 5 is provided with a predetermined distance in the longitudinal direction thereof.
Are opened. As shown in FIGS. 1 and 2, a plurality of tubes 5 are provided with air vent holes 4 near the cable sheath 2 and on the cable sheath 2 side, and the air vent holes 4 of each tube 5 are mutually connected. The air vent holes 4 are inserted into the cable 1 so as not to overlap each other at a remote position, that is, in the longitudinal direction of the cable 1. The air bleeding tube 5 is used when the cable 1 is manufactured.
By covering the cable sheath 2 with a plurality of core wires 3 together with a plurality of core wires 3 via a presser winding tape 6, the cable sheath 2 can be easily put in the cable 1.

The room temperature hardening resin 7 is filled between the core wires 3 inside the cable sheath 2 by a method such as natural injection, press-fitting, and vacuuming to form a moisture-proof dam portion 8.

In the above, an air release tube 5 having a plurality of air release holes 4 between the core wires 3 of the multi-core cable 1
Is inserted over the entire length of the cable 1, so that air between the core wires 3 in the cable sheath 2 at an arbitrary position can be freely (naturally or evacuated) outside the cable 1 through the air vent hole 4 and the tube 5. Go to For this reason, if the room temperature hardening resin 7 is filled in the small gap between the core wires 3 in the cable sheath 2 without peeling the cable sheath 2, the air remaining in the cable 1 without being replaced by the room temperature hardening resin 7 is evacuated. The tube 5 enters the tube 5 through the hole 4 and exits the cable 1. As described above, even if the room-temperature curing resin 7 is filled in the small gap between the core wires 3, since the air in the cable 1 comes out through the air bleeding tube 5, almost no internal pressure is applied inside the cable 1. And the required amount of the room temperature curing resin 7
Filling (inflow) can be performed in between.

As a result, it is possible to manufacture the moisture-proof dam portion 8 for a moisture-proof partition having the same moisture-proof properties as the conventional one without attaching the sleeve, that is, without peeling the cable sheath 2 as in the conventional case. This eliminates the need for extra mounting space for the length of the sleeve.

The air release tube 5 is located near the cable sheath 2 and each air release hole 4 is located on the cable sheath 2 side. The resin 4 makes it difficult for the hole 4 to be closed. Also, at the time of filling, even if one hole 4 is closed by the resin 7, a plurality of air release tubes 5 are inserted into the cable 1 and each air release hole 4 extends in the longitudinal direction of the cable 1. Since the air vent holes 4 are arranged so as not to overlap with each other, the air in the cable 1 comes out of the cable 1 through another hole 4, so that the air in the cable 1 is taken out without fail. be able to.

Further, even when the moisture-proof dam portions are formed at both ends of the cable 1, the room-temperature curing resin 7 is filled between the core wires 3 below the cable sheath 2 at the midpoint of the cable 1 to form a moisture-proof dam portion. 8 can be produced.

[0019]

In summary, according to the present invention, since the air vent tube having a plurality of air vent holes between the core wires of the multi-core cable extends over the entire length of the cable, the core wire inside the cable sheath is provided. The required amount of the room-temperature curing resin can be filled in between, and the excellent effect that the moisture-proof dam portion can be manufactured without requiring an extra mounting space is exhibited.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a cable with a moisture-proof dam of the present invention.

FIG. 2 is a view showing an example of a state in which the air vent tube of the present invention is put in a cable.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable 2 Cable sheath 3 Core wire 4 Air vent hole 5 Air vent tube 7 Room temperature cured resin

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyuki Otani 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Inside Hidaka Works, Hitachi Cable Corporation (72) Inventor Rikuo Ikeda, Hidaka-cho, Hitachi City, Ibaraki Prefecture 5-1-1, Hidaka Works, Hitachi, Ltd. (56) References JP-A-57-8216 (JP, A) JP-A-57-95039 (JP, U) JP-A-43-23180 (JP, U.S.A.) , B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 15/00-15/34 H01B 11/00

Claims (1)

(57) [Claims] An air bleeding tube having a plurality of air bleeding holes between the cores of a multi-core cable is inserted over the entire length of the cable, and a room temperature curing resin is filled between the cores inside the cable sheath. Cable with moisture-proof dam.