JPH028381Y2 - - 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 resin coating containing the metal sleeve for wire connection caulking is usually made of polyvinyl chloride, and the degree of heat shrinkage is poor.

<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 the present 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 difficult to avoid this large diameter part after the wires are connected. It is possible to reduce and deform the structure so that the diameter part is in close contact with the wire sheathing, and to make a watertight contact, and furthermore, the watertightness will not be destroyed even if the metal sleeve is roughly crimped and deformed with a crimping tool. We propose a sleeve for connecting electric wires.

<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
This metal sleeve 1, a synthetic resin covering sleeve 4 that is fitted and held over substantially the entire length of the metal sleeve 1, and a small diameter portion 2 that is located on and in close contact with the covering sleeve 4.
It consists of a series of synthetic resin tubes 2 consisting of an intermediate portion a and large diameter portions 2b and 2b end portions that cover the covering portion of the electric wire K, and this series of synthetic resin tubes 2 are heat-shrinkable. It is formed of a resin material, and a hot-melt resin layer 3 is adhered to its inner peripheral surface,
The covering sleeve 4 is made of a heat-resistant synthetic resin material, and the small diameter portion 2a of the synthetic resin tube 2
is a small-diameter portion that has been heat-shrinked and is tightly attached to the covering sleeve 4 due to the diameter reduction.

<Function> Since the present invention has such a structure, after connecting the electric wires, the large diameter portions 2b, 2b at both ends of the outer tube 2 can be heated and shrunk using a heating device such as a hot gun. Accordingly, these large diameter portions 2b, 2b may be brought into close contact with the covering portions of the electric wires K, K to be connected, respectively.

<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 that encases it is made of polyvinyl chloride, and the outer heat-shrinkable tube 2 is made of lightly colored transparent nylon, and its entire inner surface is coated with polyamide. It is made into a double tube in which a hot melt layer 3 of material is formed. The covering sleeve 4 is formed into a cylindrical shape with the same diameter over the entire length, and the copper sleeve 1 is housed in the middle part thereof, and the double tube 2 is heated and shrunk only in its central part to become a small diameter part 2a. As shown in FIG. 1, it has a structure in which it is closely attached to the outer peripheral surface of the covering sleeve 4. By doing so, the unshrinked large diameter portions 2b, 2b of the heat-shrinkable tube 2 are formed on the outer side of both ends of the covering sleeve 4.

Thus, the two electric wires K and K are separated from each other by peeling off the coating at the end of the covered electric wire K to form a bare electric wire K, and the two electric wires K and K are attached to the large diameter portions 2b and 2b of the tube 2, respectively, as shown by the dashed line in FIG. After inserting the bare electric wire parts k and k into the copper sleeve 1 so as to face each other as shown in FIG. 2, as shown in FIG. The upper part of the small diameter part 2a of the tube 2 is pressurized and compressed 5,5 using a pressure tool (not shown) to crimp and clamp the bare electric wire parts k, and then the large diameter part 2b of the tube 2, The top of 2b is heat-shrinked and deformed 2b', 2b' using a heating device such as a hot gun, as shown in FIG.

As a result of this heating operation, the heat-melting layers 3, 3, which were adhered and formed on the inner surfaces of the shrinkage-deformed parts 2b', 2b' of the heat-shrinkable tube 2, melt and become coated with the electric wires K, K by the shrinkage pressure of the tube 2. A portion remains between the tube 2 and a portion flows out to the inner and outer surfaces, forming lumps 3a, 3a on the covering portions of the electric wires K, K.

In this way, the covering sleeve 4 and tube 2
The wire connections located inside remain completely watertight.

Therefore, when deforming the copper sleeve 1 by pressure, even if there is no special tool for pressurization, and the tube 2 is deformed by pressure using a corrugated tool such as the tips of pliers. Since the covering sleeve 4 is interposed inside, the airtightness will not be destroyed.

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 parts 2b, 2b of which extend beyond the large diameter parts 4a, 4a of the covering sleeve 4 and further outward, and the polyamide hot melt layers 3, 3 are formed on the inner surface. The structure is based on

In this way, the bare wire parts k and k of the wires K and K from which the sheathing has been peeled are twisted together to form a tube 2.
into the metal sleeve 1 from both large diameter portions 2b, 2b side (Fig. 5), and pressurize the outer peripheral surface of the metal sleeve 1 from the outside of the tube 2 with a pressure tool to connect and clamp it (Fig. 6). Thereafter, the outer peripheries of the large diameter portions 2b, 2b on both ends of the tube 2 are heated with a heating flame to shrink and deform them 2b', 2b' so that they fit tightly onto the covering portions of the electric wires K, K (Fig. 7). .

The hot melt layer 3 in the large diameter portions 2b', 2b' deformed at this time is hot melted, and as shown in FIG. , 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 sleeve 4 are colored in different colors depending on the inner diameter size of the inner metal sleeve 1, the wires K and K can be conveniently used without making mistakes in the size.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. It can be implemented with appropriate modification 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 a sleeve for connecting electric wires, the outer periphery of the part where the metal sleeve is deformed by pressure is covered with a heat-resistant covering sleeve and a covering tube, and the outer covering tube is made of a heat-shrinkable resin material to cover both ends of the covering sleeve. Since it is formed so as to protrude outward, the outer periphery where the pressure connection of the wire is deformed by pressure with the pressure tool is doubly protected by the covering sleeve and the covering tube, so that it cannot be violently deformed by the pressure tool. It is safe because it does not break even when pressurized, there is no risk of electrical leakage, and the heat-shrinkable tube can be made into a thin film that does not inhibit the flexibility of the wire. Since it can be easily attached to the electric wire and the watertightness of the electric wire connection part can be maintained reliably, it has the advantage that it can be used as a connection sleeve without the risk of electric 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, making it a 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 crimping an electric wire connection, a synthetic resin covering sleeve 4 in which the metal sleeve 1 is fitted and held over substantially its entire length, and a covering sleeve 4 located on the covering sleeve 4. This series of synthetic resin tubes 2 consists of a middle part with a small diameter part 2a in close contact with the electric wire K, and both end parts with large diameter parts 2b and 2b which cover the covering part of the electric wire K. 2 is formed of a heat-shrinkable resin material, a heat-melting resin layer 3 is adhered to the inner peripheral surface thereof, the covering sleeve 4 is formed of a heat-resistant synthetic resin material, and the small diameter of the synthetic resin tube 2 is An electric wire connecting sleeve in which the portion 2a is a small diameter portion that is heat-shrinked and is brought into close contact with the covering sleeve 4 through 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.