JPH0338766Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a wire connection sleeve used to connect a plurality of covered wires arranged in parallel.

<Prior Art> Conventionally, a wide variety of electric wire connection sleeves 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.

Therefore, in conventional electric wire connection sleeves, a gap is created between the large diameter part into which the sheath of the electric wire to be connected is inserted and the sheath of the electric wire, and the watertightness of the connection part is reduced by peeling off the sheath and leaving a bare electric wire. The problem was that it could not be used in humid places with a lot of water droplets because there was a risk of electrical leakage.

In order to solve these problems, the applicant of the present invention proposed a wire connection sleeve as shown in FIGS. 12 to 16 in Utility Application No. 188442/1983.

The previously proposed idea will be briefly explained using the above-mentioned FIGS. 12 to 16. The metal sleeve 1 for connecting and caulking electric wires, the small diameter portion 2a that holds the metal sleeve 1 inside, and the covering portion of the electric wire K. Synthetic resin tube 2 having a large diameter portion 2b covering the top
The synthetic resin tube 2 is made of a heat-shrinkable resin material, and the small-diameter portion 2a is a heat-shrinkable small-diameter portion that shrinks to form the metal sleeve 1.
It has a structure that maintains the .

Further, as shown in FIG. 16, the sleeve is of a type in which the cylindrical shape has a small diameter part 2a having a bottom part 2c and a large diameter part 2b only on one open side, and two electric wires K, K's bare wire parts k and k are twisted together and inserted into the metal sleeve 1 in the small diameter part 2a from the large diameter part 2b, and after applying pressure to the outer peripheral surface of the metal sleeve 1 with a pressure tool to connect and clamp, Large diameter part 2
A structure was also proposed in which the outer circumferential portion of wire (b) was heated to shrink it and was brought into close contact with the covering of the two electric wires (K).

<Problems to be solved by the invention> In the wire connection sleeve having the structure shown in FIG. The longitudinal dimension of the large diameter portion 2b that is in close contact with the covering portion is approximately the same as the large diameter portion of one electric wire that is in close contact with the covering portion.

Therefore, due to the thermal contraction of the tube 2, the contact area of the large diameter portion that tightly adheres to the covering portions of the two electric wires K, K is small, and a portion of the hot melt layer 3 is Since the flow into the valley L between the electric wires K and K becomes insufficient, the effect of filling this valley L and maintaining watertightness is small.

The present invention aims to solve these problems.

<Means for solving the problem> The configuration of the present invention for achieving this purpose will be explained with reference to FIGS. 1 to 6, which correspond to typical embodiments. An electric wire connecting sleeve for connecting covered electric wires K, which includes a metal sleeve 1 for electric wire connection caulking, a small diameter portion 2a in which the metal sleeve 1 is fitted and held, and a covered portion of a plurality of electric wires K arranged in parallel. A hot-melt resin layer 3 is formed inside the large-diameter part 2d, preferably about twice or more long, for covering the sheathing part of one electric wire. The synthetic resin tube 2 is made of a heat-shrinkable resin material, and the small-diameter portion 2a is a heat-shrinkable small-diameter portion, and the shrinkage causes the metal to shrink. The structure is such that the sleeve 1 is held.

<Function> Since the present invention has such a configuration, by heating and shrinking the large diameter portion 2b using a heating device such as a hot gun after connecting a plurality of parallel electric wires, This large diameter portion 2b may be brought into close contact with the covering portion of the connecting wire.

This large diameter part 2b is longer in the longitudinal direction than the large diameter part 2d for sheathing the sheathing part of one electric wire, preferably about twice or more, so it is arranged in parallel by heat shrinking of the tube 2. The contact area of the large diameter portion 2b that is in close contact with the covering portion of the plurality of electric wires K, K is increased,
Moreover, the amount of the hot melt layer 3 flowing into the valley L between the electric wires K and K also increases.

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

1 to 6 are diagrams showing one embodiment of the present invention. This embodiment relates to a type of wire connection sleeve in which the central portion of the cylindrical body has a small diameter and both left and right end portions have large diameters. The inner metal sleeve 1 is made of copper, and the outer heat-shrinkable tube 2 is a light-colored transparent nylon product, which is a double tube with a heat-fused layer 3 of polyamide material formed on its inner surface. The double tube is formed into a full-length concentric cylindrical shape, and a copper sleeve 1 is installed in the middle part of the double tube, and only the outer peripheral surface of the copper sleeve 1 is heated and shrunk to a small diameter part 2a, so that the copper sleeve 1 is As shown in FIG. 1, the interior is retained. By doing so, unshrinked large diameter portions 2b and 2d are left at both left and right ends of the heat shrinkable tube 2.

One large-diameter portion 2d is for sheathing the sheathing part of one insulated electric wire K and bringing it into close contact, and the other large-diameter part 2b is for covering the sheathing part of two insulated electric wires K, K arranged in parallel. It is for covering and adhering,
Its longitudinal dimension is longer than that of one large diameter portion 2d, preferably approximately twice or more.

Further, a copper sleeve 1a having an inner diameter into which a bare electric wire k of one electric wire K is inserted is internally held in the copper sleeve 1 on one side of the large diameter portion 2d of the small diameter portion 2a.

The coating at the end of the covered wire K was peeled off to form a bare wire K, and the three wires K and one wire K were placed in a tube as shown by the dashed line in FIG. 2 into the large diameter parts 2b and 2d of the copper sleeves 1 and 2d, and the bare wire parts k and k are inserted into the opposite positions in the copper sleeves 1 and 1a, respectively, as shown in FIG. As shown above, the outer circumference of the copper sleeve 1 is compressed and deformed using a pressure tool to sandwich the bare wire parts k, and then the large diameter parts 2b and 2d of the tube 2 are heated with a hot gun or the like. The material is heated and shrunk and deformed using a heating device as shown in FIG.

By this heating operation, the heat-melted layer 3 formed on the inner surface of the heat-shrinkable tube 2 is melted, and due to the shrinkage pressure of the tube 2, a portion remains between the covering of the electric wire K and the tube 2, and a portion remains on the inner and outer surfaces. It flows out to form lumps 3a and 3b.

At this time, the hot melt layer 3 in the large diameter portions 2b and 2d is hot melted, and as shown in FIG. It also flows into the valleys L between the electric wires K, filling the valleys L and maintaining watertightness.

In this way, the wire connections within the tube 2 remain completely watertight.

FIG. 7 shows another embodiment, in which the copper sleeve 1a for connecting one electric wire K is omitted,
It is suitable for connecting a plurality of electric wires K arranged in parallel and a plurality of electric wires K arranged in parallel, and the embodiment shown in FIG. 8 is a structure for omitting the copper sleeve 1a. A small diameter portion 2e smaller in diameter than the small diameter portion 2a is formed at one end of the small diameter portion 2a of the tube 2, and a small diameter portion 1b having a smaller diameter is also formed at one end of the copper sleeve 1.

The embodiments shown in FIGS. 9 to 11 are examples of wire connection sleeves in which the cylindrical shape has a small diameter part 2a having a bottom part 2c and a large diameter part 2b only on one open side. It is something.

The outer heat-shrinkable tube 2 is an injection-molded high-density polyethylene (HDPE) molded product, and a copper metal sleeve 1 is press-fitted into the small diameter part 2a, and a polyamide sleeve is inserted into the inner surface of the large diameter part 2b. A hot melt layer 3 is formed.

In this way, the large diameter part 2 is twisted together with the bare wire parts k and k of the wires K and K whose coatings have been peeled off.
b into the metal sleeve 1 in the small diameter part 2a (Fig. 10), press the outer peripheral surface of the metal sleeve 1 with a pressure tool to connect and clamp it, and then heat the outer peripheral part of the large diameter part 2b with a heating flame. to shrink the electric wire K,
It is brought into close contact with the covered part of K (Fig. 11).

At this time, the hot melt layer 3 in the large diameter portion 2b is hot melted and a part of it is pushed out onto the covering of the electric wire K due to the contraction of the tube 2 as shown in FIG.
A portion also flows into the valley L between the two electric wires K and K, filling this valley L and maintaining watertightness.

In addition to the above-described embodiments, the heat-shrinkable tube 2 according to the present invention may be made of a double layer of high-temperature nylon and low-temperature melting nylon, and the heat-melting material used inside may be a heat-melting adhesive. In particular, materials that have good adhesion to polyvinyl chloride (PVC), which is commonly used as a covering material for electric wires, are suitable.

In addition, if the heat-shrinkable tube 2, including the inner heat-melting layer, is made transparent or semi-transparent, it is convenient to see through the state of insertion and crimping of the electric wire into the metal sleeve 1 inside. It can be used for. Further, if the tube is colored so that the tube has different colors depending on the inner diameter size of the inner metal sleeve, it can be conveniently used without making mistakes in the size.

To summarize the matters shown in the embodiments above, the present invention can be implemented as follows.

The synthetic resin tube 2 shall be made of nylon.

The synthetic resin tube 2 shall be made of polyethylene.

The synthetic resin tube 2 shall be made of high density polyethylene.

The synthetic resin tube 2 shall be a transparent body through which the inside can be seen.

The synthetic resin tube 2 should be a colored transparent body.

The synthetic resin tube 2 is assumed to have a small diameter section 2a at its longitudinally intermediate portion and a large diameter section 2b at both ends.

One large diameter portion 2b of the synthetic resin tube 2 is formed to be longer in the longitudinal direction than the other large diameter portion 2d.

The synthetic resin tube 2 has a small diameter part 2e on one end side of the small diameter part 2a, which is smaller in diameter than the small diameter part 2a.

The inner diameter of one end of the metal sleeve 1 for wire connection caulking shall be smaller than the inner diameter of the other end.

It shall have a metal sleeve 1a fitted inside one end side of the metal sleeve 1 for electric wire connection caulking.

The synthetic resin tube 2 is biased toward one end in the longitudinal direction to form a small diameter part 2a, its terminal end is closed, and only the other end is formed as a large diameter part 2b.

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 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 the electric wire connection sleeve, the covering tube of the metal sleeve is made of a heat-shrinkable resin material to maintain insulation, and a hot-melt resin or adhesive is formed on the inner surface of the tube, so that the electric wire After being connected under pressure, it can be heat-shrinked and brought into close contact with the electric wire, and the large-diameter part that covers the covering of the multiple electric wires installed in parallel is made long.
Since the watertightness of the wire connection portion can be maintained sufficiently, it has the advantage that it can be used as a connection sleeve with less risk of electrical leakage even in humid areas.

[Brief explanation of the drawing]

Figures 1 to 6 show one embodiment of the wire connection sleeve of the present invention, in which Figure 1 is an overall perspective view, and Figures 2 to 4 are sequential illustrations of the process of use. 5 and 6 are sectional views taken along lines - and - in FIGS. 2 and 4, and FIGS. 7 and 8 are central longitudinal sectional views showing different embodiments, respectively. 9 to 11 show other embodiments, in which FIG. 9 is a perspective view of the entire structure, and FIGS. 10 and 11 are central longitudinal cross-sectional views sequentially showing the process of using the same. 12 to 16 are reference explanatory diagrams showing the electric wire sleeve previously proposed by the applicant of the present invention, in which FIG. 12 is an overall perspective view, and FIG. 13 to 15 are central longitudinal sections in the order of use steps. The top view and FIG. 16 are central longitudinal cross-sectional views of the same embodiment. 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, and K is an electric wire.

Claims (1)

[Scope of utility model registration request] It is equipped with a metal sleeve 1 for caulking electric wire connections and a synthetic resin tube 2 made of a heat-shrinkable resin material, and the synthetic resin tube 2 has a small diameter in which the metal sleeve 1 is fitted and held by its heat shrinkage. An electric wire connection having a large diameter portion 2b having a diameter that covers the covering portions of a plurality of covered electric wires K arranged in parallel, and a large diameter portion 2b having a heat-melting resin layer 3 formed therein. In the sleeve, the large diameter portion 2b is 1
An electric wire connection sleeve characterized in that it has a length approximately twice or more than the length of another large diameter portion 2d for a covered electric wire K.