JPH028379Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a wire connection sleeve used for connecting coated wires in series.

<Prior Art> Conventionally, a wide variety of sleeves for connecting electric wires of this type have already been commercialized. However, in these products, the coating resin containing the metal sleeve for wire connection caulking is usually made of polyvinyl chloride and has poor heat shrinkage.

<Problem to be solved by the invention> Therefore, in the conventional sleeve for connecting electric wires, a gap is created between the large diameter part into which the sheathing part of the electric wire to be connected is inserted and the sheathing part of the electric wire, and the sheathing is peeled off. The disadvantage was that it was not possible to maintain the watertightness of the connections made with bare electric wires, and that they could not be used in humid locations with a lot of water droplets due to the risk of electrical leakage.

The purpose of this invention is to solve this problem, and although the sheathing part of the connecting wire is formed to have a large diameter part that can be easily inserted when connecting the wires, it is possible to The present invention proposes an electric wire connecting sleeve whose diameter portion can be reduced and deformed into a structure in which it comes into close contact with the covering portion of the electric wire, and which can be brought into close contact with the covering portion of the electric wire in a watertight manner.

<Means for Solving the Problems> The structure of the present invention for achieving this object will be explained using FIGS. 1 to 4 corresponding to the embodiments. 1
A synthetic resin covering sleeve 4 which holds the metal sleeve 1 therein, a small diameter part 2a located on and in close contact with the covering sleeve 4, and a large diameter part 2b which covers the covering part of the electric wire K. It consists of a pair of left and right synthetic resin tubes 2, 2, and these pair of synthetic resin tubes 2, 2 are made of a heat-shrinkable resin material, and a heat-melting resin layer 3 is adhered to the inner peripheral surface thereof. , the small diameter portion 2a is a small diameter portion that has been heat-shrinked and is brought into close contact with the covering sleeve 4 by reducing its diameter.

<Function> Since the present invention has such a structure, after connecting the electric wires, the large diameter parts 2b, 2b of the tubes 2, 2 can be heated and contracted using a heating device such as a hot gun. , each electric wire K connecting these large diameter portions 2b, 2b,
It is sufficient if it is brought into close contact with the covered portion of K.

<Examples> Examples of the present invention will be described below based on the drawings.

1 to 4 are diagrams showing a first embodiment of the present invention. This embodiment relates to a metal sleeve 1 for connecting and caulking electric wires, in which the central part of the cylinder has a small diameter 1a for a stopper, and both left and right ends have tubes for inserting bare electric wires. The metal sleeve 1 is made of copper, the outer sheathing sleeve 4 is made of polyvinyl chloride, and the outer heat-shrinkable tube 2 is made of light-colored transparent nylon, and the entire inner surface is coated with hot-melted polyamide material. It is a double tube with layer 3 formed thereon. The covering sleeve 4 is formed into a cylindrical shape with the same diameter over the entire length, and the copper sleeve 1 is placed in the middle part thereof, and the double tubes 2 and 3 are heated and shrunk only at one end thereof to become a small diameter part 2a. , which are held in close contact with both ends of the covering sleeve 4, as shown in FIG. By doing this, the unshrinked large-diameter portions 2b, 2b of the heat-shrinkable tubes 2, 2 are placed on the outer side of both ends of the covering sleeve 4.
It was formed so that the

Then, the two electric wires K and K are separated into tubes 2 and 2, respectively, as shown by the dashed line in FIG.
After inserting the bare wire parts k, k into the copper sleeve 1 in opposing positions as shown in FIG. 2, as shown in FIG. , the outer peripheral part of the copper sleeve 1 is pressurized and compressed 5, 5 from above the covering sleeve 4 with a pressure tool (not shown) to crimp and clamp the bare electric wire parts k,
Next, the large diameter portions 2b, 2b of the tubes 2, 2 are heat-shrinked and deformed 2', 2' using a heating device such as a hot gun, as shown in FIG.

By this heating operation, the heat-melted layers 3, 3 formed on the inner surfaces of these heat-shrinkable tubes 2, 2 are melted, and due to the shrinkage pressure of the tubes 2, 2, the covering of the electric wires K, K and the tubes 2, 2 are bonded together. A part remains in between, and a part flows out to the inner and outer surfaces, and lumps 3a,
Form 3a.

In this way, the sheathing sleeve 4 and the wire connections located within the tubes 2,2 remain completely watertight.

The embodiments shown in FIGS. 5 to 7 are embodiments in which the covering sleeve 4 has large diameter portions 4a, 4a at both ends.

The outermost heat-shrinkable tube 2 is made of injection-molded high-density polyethylene (HDPE).
It is a molded product, the large diameter portions 2b, 2b of which extend beyond the large diameter portions 4a, 4a of the covering sleeve 4 to the outside, and a polyamide hot melt layer 3, 3 is formed on the inner surface. It has a structure that is

In this way, the bare wire portions k, k of the wires K, K, whose coatings have been peeled off, are twisted together, and the metal sleeve 1
(Fig. 5), press the outer peripheral surface of the metal sleeve 1 with a pressure tool to connect and clamp it (Fig. 6), and then press the outer peripheral part of the large diameter parts 2b, 2b of the tubes 2, 2. It is heated with a heating flame to shrink it and make it adhere tightly to the covered parts of the electric wires K and K (Fig. 7).

At this time, the hot melt layer 3 in the large diameter portions 2b, 2b is hot melted, and as shown in FIG.
a, 3a are formed, and watertightness is maintained.

FIG. 8 shows yet another embodiment, in which both ends of the covered sleeve 4 are formed to have an enlarged diameter, so that when the bare electric wires k, k are inserted into the metal sleeve 1, they can be inserted smoothly. A guide surface is formed to make it easier to move. The present invention can also be implemented in this manner.

In addition to those shown in the above embodiments, the heat-shrinkable tube 2 and the heat-melting resin layer 3 referred to in the present invention may be a double layer of high-temperature nylon and low-melting nylon, and the heat-melting material used inside 3 may be a hot-melt adhesive, and materials with good adhesion to polyvinyl chloride (PVC), which is generally used as a covering material for electric wires, are particularly suitable.

In addition, if the heat-shrinkable tube 2 and the inner covering sleeve 4 are made transparent or semi-transparent, it is convenient to see through the insertion state of the electric wire and the crimping state of the electric wire with respect to the inner metal sleeve 1. Can be used. Also, these tubes 2
If the inner metal sleeve 1 and the inner metal sleeve 1 are colored to have different colors depending on the inner diameter size of the inner metal sleeve 1, it is possible to conveniently use the electric wires K and K without making a mistake in their sizes.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structure of these embodiments, and the present invention is not necessarily limited to the structure of these embodiments. It can be implemented with appropriate modifications within the scope of achieving the following effects.

<Effects of the invention> As is already clear from the above explanation, the invention has the following effects:
In the sleeve for connecting electric wires, the outer periphery of the part where the metal sleeve is deformed by pressure is covered with a covering sleeve, and covering tubes for maintaining insulation are attached to the outside of both ends of the covering sleeve using heat-shrinkable resin material. Because it is formed to protrude, the outer periphery of the wire that is deformed under pressure by the pressure tool is protected by the covering sleeve, and it will not be destroyed by the pressure tool and there is no risk of electrical leakage. It is safe, and the heat-shrinkable tube can be made into a thin film that does not impede the flexibility of the wire, making it easy to heat-shrink the tube and make it adhere tightly to the wire, ensuring watertightness at the wire connection. Therefore, it has the advantage that it can be used as a connection sleeve without the risk of electrical leakage even in humid areas.
In particular, since an adhesive layer is formed on the inner surface of the sheathing tube using a heat-melting resin or adhesive, there is no risk of water droplets entering the connection sleeve from the wire sheathing, allowing safe wire connection. Can be used as a sleeve.

[Brief explanation of the drawing]

Figures 1 to 4 are views showing the first embodiment of the present invention, in which Figure 1 is an overall perspective view, and Figures 2 to 4 are longitudinal longitudinal views showing the steps of use. The top view and FIGS. 5 to 7 are views showing other embodiments, and each is a central vertical sectional view sequentially showing the process of using the same, and FIG. 8 is a center longitudinal sectional view showing still another embodiment. FIG. In the figure, 1 is a metal sleeve, 2 is a synthetic resin tube, 2a is a small diameter portion, 2b is a large diameter portion, 3 is a hot-melt resin layer, 4 is a covering sleeve, and K is an electric wire.

Claims (1)

[Claims for Utility Model Registration] A metal sleeve 1 for electric wire connection caulking, a synthetic resin covering sleeve 4 in which the metal sleeve 1 is fitted and held, and a small diameter portion 2a located on and in close contact with the covering sleeve 4. and a pair of left and right synthetic resin tubes 2, 2 having a large diameter portion 2b that covers the covering portion of the electric wire K, and these pair of synthetic resin tubes 2, 2 are made of a heat-shrinkable resin material. A sleeve for connecting electric wires, in which a heat-melting resin layer 3 is adhered to the inner peripheral surface thereof, the small diameter portion 2a is a small diameter portion that is heat-shrinked, and is brought into close contact with the covering sleeve 4 by diameter reduction. The electric wire connection sleeve according to claim 1, wherein the synthetic resin tube 2 is made of nylon. The electric wire connection sleeve according to claim 1, wherein the synthetic resin tube 2 is made of polyethylene. The electric wire connection sleeve according to claim 1, wherein the synthetic resin tube 2 is made of high-density polyethylene. The electric wire connection sleeve according to claim 1, wherein the synthetic resin tube 2 is a transparent body whose interior can be seen through. The electric wire connection sleeve according to claim 1, wherein the synthetic resin tube 2 is a colored transparent body. The electric wire connection sleeve according to claim 1, wherein the covering sleeve 4 is made of polyvinyl chloride. The electric wire connection sleeve according to claim 1, wherein the covering sleeve 4 is made of ABS.