JPH0258749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for connecting a plurality of covered wires arranged in parallel using a wire connection sleeve.

<Prior Art> A wide variety of wire connection sleeves used in this type of conventional method for connecting covered wires 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 where the sheath is peeled off and the wire is left as a bare electric wire cannot be improved. It had the disadvantage that it could not be used in humid places with a lot of water droplets due to the 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 15. The metal sleeve 1 for connecting and caulking electric wires, the small-diameter portion 2a in which the metal sleeve 1 is fitted and held, and the covering portion of the electric wire K. A large diameter portion 2 having a jacket on the top and a heat-melting resin layer 3 formed inside.
a synthetic resin tube 2 having b.
The synthetic resin tube 2 is made of a heat-shrinkable resin material, and the small-diameter portion 2a is heated and shrunk, and the metal sleeve 1 is held by the small-diameter portion due to the shrinkage.

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
We also proposed a structure 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 structure in which two electric wires K and K installed in parallel are connected using the electric wire connection sleeve of the structure shown in FIG. 16, the large diameter portion 2b of the tube 2 is heat-shrinkable. The sheathing parts of the two electric wires K and K are closely attached to each other to provide watertightness. Since a gap was formed between the coated part of K and the large diameter part 2b that was in close contact with the outer periphery thereof, the effect of maintaining watertightness was not sufficient.

The present invention aims to solve these problems.

<Means for Solving the Solution> The structure of the present invention for achieving the object will be explained using FIGS. 1 to 6 corresponding to typical embodiments. A method for connecting a plurality of covered electric wires K..., which includes a metal sleeve 1 for wire connection caulking, and this metal sleeve 1.
A synthetic resin tube 2 having a small diameter part 2a which is fitted and held therein, and a large diameter part 2b which covers the covering parts of a plurality of insulated electric wires K... arranged in parallel and has a heat-meltable resin layer 3 formed therein. This synthetic resin tube 2 is made of a heat-shrinkable resin material, and the small diameter portion 2
The electric wire connection sleeve S which holds the metal sleeve 1 by contraction at a, and the circumscribed shape that circumscribes the covering portions of the plurality of parallelly arranged covered electric wires K... Book covered electric wire K...
The spacer 4 is provided with a recessed notch 4a into which each coated wire K is fitted, and the spacer 4 is provided between the coated portions of the plurality of insulated wires K disposed in parallel.
are inserted into the concave notches 4a by fitting and inserting the covering portions of the plurality of insulated wires K. ... is inserted into the metal sleeve 1 in the small diameter portion 2a from the large diameter portion 2b of the synthetic resin tube 2, and then the outer peripheral portion of the metal sleeve 1 is compressed and deformed under pressure to sandwich the bare electric wire portion k. After that, the large diameter portion 2b of the synthetic resin tube 2 is heated and shrunk to connect the plurality of covered electric wires K arranged in parallel.
It has a structure in which it is closely attached to the covering portion of... with the heat-melting resin layer 3 interposed therebetween.

<Function> Since the present invention has such a configuration, the spacer 4 is inserted between the sheathing parts of the plurality of electric wires K... arranged in parallel, and the large tube 2 is attached to the outer periphery of the sheathing part. By bringing the diameter portions 2b into close contact with each other by thermal contraction, there is no gap between the sheathing portions of the plurality of parallel electric wires K..., the spacer 4, and the heat-shrinked large diameter portion 2b.

<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 method for connecting two covered electric wires arranged side by side using a wire connecting sleeve of the type in which the central part of the cylinder has a small diameter and the left and right ends have large diameters. The inner metal sleeve 1 is made of copper, and the outer heat-shrinkable tube 2 is made of lightly colored transparent nylon, and is a super-heavy tube with a heat-melting resin layer 3 made 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, unshrinkable large diameter portions 2b, 2b are left at both left and right ends of the heat shrinkable tube 2.

One of the large diameter portions 2b is for encasing and adhering the covering portion of one covered wire K, and the other large diameter portion 2b is for covering the covering portions of two parallel covered wires K, K. It is a barrel that is covered with a cloak and tightly attached.

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

Reference numeral 4 denotes a spacer inserted between the covering parts of two parallel covered electric wires K, K, which is integrally molded from a rigid or preferably flexible synthetic resin material, and whose cross-sectional shape has a predetermined shape. It has a circumscribed shape that circumscribes the sheathing parts of two sheathed electric wires K and K that are arranged in parallel at an interval, and has a half-shape at both ends along the outer periphery of the sheathing part into which the half part of this sheathing part fits. Circular recessed portions 4a, 4a are formed, respectively.

Then, the coating at the end of the covered electric wire K is peeled off to form a bare electric wire part k, and the bare electric wire parts k, k are twisted together and a spacer 4 is placed between the coated parts of two electric wires K, K which are arranged in parallel. are inserted, and the covering portions of the two electric wires K, K arranged in parallel are fitted into the recessed notches 4a, 4a at both ends of the spacer 4, respectively. Then, these two parallel electric wires K, K and one electric wire K are inserted into the large diameter portions 2b, 2b of the tube 2, respectively, as shown by the dashed lines in FIG. As shown in , the bare wire parts k and k are covered with copper sleeves 1 and 1a.
After inserting the third
As shown in the figure, the outer periphery 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 part 2 of the tube 2
The tops of b and 2b are heated and deformed by heating using a heating device such as a hot gun, as shown in FIG.

By this heating operation, the heat-melting resin layer 3 formed on the inner surface of the heat-shrinkable tube 2 is melted, and due to the contraction pressure of the tube 2, a portion remains between the covering of the electric wire K and the tube 2. Mass 3a flowing out to the inner and outer surfaces,
3b is formed.

Furthermore, due to the contraction pressure of the tube 2, the covering portions of the two electric wires K and K arranged in parallel are
A and 4a are tightly pressed together to maintain watertightness.

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

FIGS. 7 and 8 show other embodiments for connecting three or more covered wires K, and the cross-sectional shape of the spacer 4 shown in FIG. It has a substantially triangular shape, and recessed notches 4a into which approximately two-thirds of the covering portion fits are formed at each of the three ends. Spacer 4 in Figure 8
similarly has a substantially rectangular shape, and has recessed notches 4a formed at each of its four ends.

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 resin layer 3 is formed.

Similar to the embodiments shown in FIGS. 1 to 6, a spacer 4 is provided between the covered parts of the two wires K, K, which are arranged in parallel by twisting the bare wire parts k, k.
Then, insert the bare wire parts k and k of these two wires K and K into the metal sleeve 1 in the small diameter part 2a from the large diameter part 2b (Fig. 10), and press the metal with a pressure tool. After pressurizing the outer circumference of the sleeve 1 to connect and clamp it, the outer circumference of the large diameter portion 2b is heated with a heating flame,
This is shrunk and brought into close contact with the covering portions of the electric wires K and K (Fig. 11).

At this time, the hot-melt resin layer 3 in the large diameter portion 2b is thermally melted and a part of it is pushed out onto the covering of the electric wire K by the contraction of the tube 2 as shown in FIG. The covering portions of the two electric wires K and K arranged in parallel are located in the concave notch 4 of the spacer 4.
A and 4a are tightly pressed together to maintain watertightness.

In addition to the above embodiments, the heat-shrinkable tube 2 used in 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. 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 resin layer, is made transparent or semi-transparent, it is possible to see through the state of insertion and crimping of electric wires into the metal sleeve 1 inside. It can be used conveniently. 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 2b.

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

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

The spacer 4 shall be made of flexible synthetic resin.

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. 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 description, the present invention has the following effects:
In a method for connecting multiple covered wires installed in parallel using a wire connection sleeve, the covering tube of the metal sleeve is formed using a heat-shrinkable resin material to maintain insulation, and the inner surface of the tube is made of a heat-shrinkable resin material. Since the resin material or adhesive is formed, it can be heat-shrinked to tightly adhere to the wire after the wires are connected under pressure, and it is also possible to insert a spacer between the covering parts of multiple wires installed in parallel. Since the wire connection portion can be sufficiently watertight by inserting the wire into the wire, 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 an embodiment of the covered wire connection method of the present invention, in which Figure 1 is an overall perspective view, and Figures 2 to 4 sequentially show the process of use. 5 and 6 are cross-sectional views taken along lines - and - in FIGS. 2 and 4, and FIGS. 7 and 8 are cross-sectional views showing different embodiments, respectively. 9 to 11 show other embodiments, FIG. 9 is a perspective view of the whole, and FIG.
0 and 11 are central vertical sectional views sequentially showing the process of using the sleeve, and FIGS. 12 to 16 are reference explanatory views showing the electric wire sleeve previously proposed by the applicant of the present invention. So, Figure 12 is an overall perspective view,
13 to 15 are central vertical cross-sectional views in the order of use steps, and FIG. 16 is a central vertical cross-sectional view 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, 3 is a hot-melt resin layer, 4 is a spacer, 4a is a recessed portion, and K is an electric wire.

Claims (1)

[Claims] 1 A method for connecting a plurality of coated electric wires K arranged in parallel, including a metal sleeve 1 for wire connection caulking, a small diameter portion 2a in which the metal sleeve 1 is fitted and held, and a plurality of coated electric wires arranged in parallel. It consists of a synthetic resin tube 2 having a large diameter portion 2b that covers the covering portion of the electric wire K and has a heat-meltable resin layer 3 formed inside, and this synthetic resin tube 2 is made of a heat-shrinkable resin material. A wire connecting sleeve S which is formed and holds the metal sleeve 1 by contraction at the small diameter portion 2a, and a circumscribed shape that circumscribes the covering portions of the plurality of covered wires K arranged in parallel, and each end thereof Spacers 4 each having a recessed notch 4a into which each covering portion of the plurality of covered wires K arranged in parallel is fitted.
and the plurality of covered electric wires K...
The spacer 4 is placed between the covering portions of the recessed portions 4a...
The covering portions of the plurality of covered electric wires K arranged in parallel are respectively fitted and inserted into the tube, and the bare electric wire portions k of the plurality of covered electric wires K arranged in parallel are inserted into the synthetic resin tube. 2 from the large diameter part 2b to the small diameter part 2
After inserting into the metal sleeve 1 in a, the outer peripheral part of the metal sleeve 1 is compressed and deformed under pressure to connect the bare electric wire parts k..., and then the large diameter part 2b of the synthetic resin tube 2 is inserted into the metal sleeve 1. A method for connecting covered electric wires, in which the covered electric wires are heat-shrinked and brought into close contact with the covered portions of the plurality of covered electric wires K arranged in parallel via the hot-melt resin layer 3.