JP2532370B2 - Lead wire end coating structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICABILITY The present invention has a possibility that some sort of connection work may be carried out on a lead wire which is installed outdoors and is led out from an instrument main body, but the connection work is carried out depending on circumstances. The present invention relates to a lead wire end covering structure in the case of not being damaged.

2. Description of the Related Art Heretofore, there have been the following types of processing structures for wire insulation between the tips of lead wires of this type, or for insulation and waterproofing from the outside. As one of them, as shown in FIG. 3, there is a structure in which an epoxy resin adhesive 2 is built up on the tip of a lead wire 1 covered with a core wire. in this case,
The epoxy resin adhesive 2 uses an adhesive which is a combination of this agent and a curing agent, and has a curing time of 24 hours.

Further, as shown in FIG. 4, the tip end of the lead wire 1 is inserted into the closed-end tube connector 2, and after caulking (this caulking portion is indicated by reference numeral 2a), a resin adhesive 3 is poured and cured. There is a structure.

The problem to be solved by the invention However, in the former structure, since the epoxy resin adhesive is used, it takes time to mix this agent and the curing agent, and the curing time of the epoxy resin is 24 hours. Because it is long
It takes too much man-hours to process parts. Furthermore, lead wire 1
However, there is a drawback in that the insulation / waterproofness as a result of treating the terminal cannot be judged immediately. Further, as shown in FIG. 3, the thickness of the built-up epoxy resin adhesive 2 is not uniform, and the thickness can be reduced.
There is a problem that it is difficult to secure quality and reliability.

On the other hand, in the case of the latter structure, the work of injecting the adhesive 3 into the gap is difficult to perform, and similarly to the case of the former, it takes time to cure, and further, due to the addition of the caulking step, There is a problem that it takes more time.

As described above, the conventional structure still has room for improvement in terms of workability, economic efficiency, and time (man-hours).

The present invention eliminates such conventional problems, and can easily, at low cost, end coat a lead wire, and further,
It is an object of the present invention to provide a lead wire terminal covering structure having excellent insulation and waterproof properties.

Means for Solving the Problems In order to achieve the above object, the lead wire end coating structure of the present invention is provided with an outer layer cylinder having electrical insulation and heat shrinkage hardening, and an electric insulation integrally provided on the inner surface of the outer layer cylinder. Equipped with an insulating tube made of an inner layer tube having heat resistance and heat melting hardening property, and a plurality of covered electric wires which are inserted into the insulating tube with cut end faces aligned in different stages and are covered by the heat melting hardening property of the inner layer tube. It is a thing.

With the above structure, the terminal covering structure of the lead wire of the present invention cuts a plurality of covered electric wires, holds the end surfaces of the electric wires so that they are separated from each other, and inserts them into the insulating tube so as to cover the end surfaces. To do. In this state, the outer surface of the outer tube of the insulating tube is heated. At this time, heat is transferred from the heated outer-layer cylinder to the inner-layer cylinder, and the inner-layer cylinder melted by this heat is contracted so as to be in close contact with the outer circumference of the covered electric wire in the outer-layer cylinder whose outer diameter is thermally contracted, It flows to the tip side of the cut end surface where it easily flows out in the insulating tube. Then, when the heating is stopped at the time of reaching the end surface of the insulating tube, the inner layer tube which is cooled by the outside air and melt-deformed and the outer layer tube whose outer diameter is reduced and deformed are rapidly hardened in that state.

EXAMPLE An example of the lead wire end coating structure of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is a lead wire, and the core wire is covered with a covering tube.
Since a and 1b enhance the electric insulation, one is long and the other is short. Reference numeral 4 denotes an outer-layer cylinder made of a heat-shrinkable tube formed of polyolefin or the like, and 5 denotes an inner-layer cylinder made of an ethylene-vinyl acetate copolymer integrally provided on the inner surface of the outer-layer cylinder 4, and is a lead before the outer-layer cylinder 4 contracts. A cavity 6 is ensured for easy insertion of the wire 1.

Next, the covering structure of the terminals 1a and 1b of the lead wire 1 will be described.

The ends 1a and 1b of the lead wire 1 are inserted into the inner layer tube 5, and the outer layer tube 4 is heated. The outer layer cylinder 4 is thermally contracted and hardened by heating, and the inner layer cylinder 5 also flows due to the above-described action of the outer layer cylinder 4 and the gap between the terminals 1a, 1b and the inner layer cylinder 5 (before contraction shown in FIG. 1) ( The cavity 6) is filled and cured as in FIG. In this state, the terminals 1a and 1b of the lead wire 1 are the outer cylinders.
4, The inner layer cylinder 5 is hardened together with the inner layer cylinder 5 so that it will not come off easily, and the inner layer cylinder 5 covers the cut end face of the lead wire 1 so that electrical insulation is achieved even if water droplets or the like adhere. You can keep your sex.

If the cut end surface of the lead wire 1 is visually controlled so as not to protrude from the inner layer cylinder 5, it can be sealed with the melted inner layer cylinder 5 flowing from the left side to the right side in the drawing. In this case, even if one of the cut end faces is exposed to the outside air due to the bad flow of the inner layer cylinder 5, if the other cut end faces are sealed, the electrical insulation between the cut end faces is maintained. Be done.

Furthermore, even if the two cut end faces are in the same cavity formed by the melted inner layer pipe 5, as long as the tip of the outer layer pipe 4 is sealed by the melted inner layer pipe 5, both cut end face tubes are Since they are arranged in different steps, electrical insulation is maintained as well.

EFFECTS OF THE INVENTION As is clear from the above description, the lead wire terminal covering structure of the present invention has the following effects.

(1) An inner layer cylinder in which cut end faces of a plurality of covered electric wires are arranged in a stepwise manner and are separated from each other, and the vicinity of the cut end face of the stepwise difference is closely covered with a heat-melting curable material, and the inner layer cylinder is closely contracted by heat shrinkage curability. Since it is a structure that is sealed by the outer layer cylinder that has been made, the cut end surface of each covered electric wire has excellent drip-proof property,
Can protect against electrical short circuits.

(2) In the terminal covering structure of the lead wire formed in this way, the inner layer tube bundles and holds a plurality of electric wires, and the electric wire holding force of the inner layer tube and the outer layer tube is strong, so It does not easily fall off due to vibration, etc., and reliability is further improved.

(3) Also, the electrical insulation treatment can be performed only by the heating process, so that it can be realized in a short time as compared with the case of using the conventional epoxy resin which requires each process of mixing, filling and curing, for example. Is good.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lead wire terminal covering structure before shrinkage in one embodiment of the present invention before shrinking, FIG. 2 is a vertical cross-sectional view after shrinkage, and FIGS. 3 and 4 are vertical cross-sectional views of a conventional example. It is a figure. 1 ... Lead wire, 4 ... Outer layer tube, 5 ... Inner layer tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeru Kimura 4-11-3 Kikawahigashi, Yodogawa-ku, Osaka City Kuroda Electric Co., Ltd. (72) Takashi Yamazaki 4--11-3 Kigawahigashi, Yodogawa-ku, Osaka Issue Kuroda Electric Co., Ltd. (56) Bibliography Sho 55-160072 (JP, U) Rikai 57-36673 (JP, U)

Claims (1)

(57) [Claims] 1. An insulating tube comprising an outer layer cylinder having electrical insulation and heat shrinkage hardening, and an inner layer cylinder integrally provided on the inner surface of the outer layer cylinder and having electrical insulation and heat melt hardening, and a cut end surface having different steps. And a plurality of covered electric wires which are inserted into the insulating tube and are covered by the heat-melt hardening property of the inner layer cylinder.