JPS648437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for interconnecting core wires of communication cables, power cables, and the like.

The connections between core wires that have been implemented up to now can be broadly classified into twist connections of core wires, twist soldering connections, and mechanical connections using connectors or the like. Twisted connections are easy to work with and are economical because they simply twist the core wires together, but the twisted portions tend to become loose contacts, which not only has the drawback of lacking connection reliability, but also causes code conversion in data lines. That was pointed out. On the other hand, twisted solder connection of core wires has the highest reliability in the connection part, but it is dependent on the skill of the technique and has the drawback of lacking workability. In particular, since it takes time for the molten solder to solidify,
It was not suitable for mechanically connecting multiple lines. In addition, various types of connectors with good workability are available for mechanical connection, but the mechanical crimping or locking requires an increase in the size of the connection structure. Not only does this have the disadvantage of making the connection part thicker, but it also increases the weight and puts a strain on nearby cables.

As mentioned above, each connection has its advantages and disadvantages, so proposals have been made that take advantage of the reliability of brazing and the workability of mechanical connections. That is,
A solder thread is inserted into a cylindrical sleeve along with a core wire, and crimping and heating are applied simultaneously using a heated crimping tool. However, it is necessary to insert filamentous solder in addition to the core wire, and
The solder threads tend to fall off the sleeve, and workability is not improved. Further, crimping and heating must always be performed simultaneously using a heated crimping tool or the like. If heating is applied after crimping, not only will a highly reliable connection not be obtained because voids of filamentous solder before melting will be formed in the sleeve during crimping, but also the voids will form between the solder melting and solidification. The disadvantage was that the core wire had to be held inside so that it did not move. inside the sleeve,
A method in which a cylindrical brazing alloy is interposed in advance is also considered, but the same drawbacks as above occur.

The present invention was developed in view of the above-mentioned circumstances, and is capable of crimping and brazing core wires to each other using a metal substrate impregnated with a brazing alloy, and is highly reliable. The object of the present invention is to provide a method for interconnecting core wires that provides a good connection, has good workability, and allows the connection portion to be miniaturized. The present invention will be described below based on an illustrated embodiment.

1 to 3 show a basic embodiment of the method for connecting core wires according to the present invention, and FIG. 1A is a partially cutaway perspective view showing a connecting tool used in the method, and FIG. Figure B is a longitudinal sectional view of the same, Figure 2 is an enlarged sectional view showing a part of the metal substrate, Figure 3 A is a horizontal sectional view showing the connection state, and Figure B is an enlarged longitudinal sectional view of the same. be.

1 is a metal substrate having a brazing alloy impregnated portion, 2 is a small hole provided in the metal substrate 1 as an impregnated portion, 3 is a brazing alloy provided in the small hole 2, and 4 is a metal substrate 1
The insulating jacket 4 is an insulating jacket made of an insulating film that insulates the outside of the metal substrate 1. The insulating jacket 4 extends to both sides of the metal substrate 1. Further, a represents the core wire to be connected, and B represents the insulation coating of the core wire a.

The metal substrate 1 has a thin plate shape made of a metal material that is a good electrical conductor and is easily plastically deformable, such as iron or a copper alloy. The outer side of the insulating jacket 4 is similarly shaped like a U-shaped sleeve. A large number of small holes 2 are formed in this metal substrate 1 by means such as punching, and a brazing alloy 3 is impregnated into the small holes 2 by a dip dipping method or the like. small hole 2
is the hole diameter, depending on the calculation of the required amount of brazing alloy.
The number of holes is determined. As the brazing alloy 3, a low melting alloy such as solder is preferably used. Furthermore, flux is applied to the inside of the metal substrate 1.

As the insulating jacket 4, synthetic resin or rubber with good insulation properties is used. Although not shown, the insulating jacket 4 may be formed in advance into a cylindrical shape, and the U-shaped metal substrate 1 may be held within the cylinder.

Next, the connection method will be explained. Metal substrate 1
The core wires a, a with the insulating coatings b, b removed from the tips of the cables to be connected are inserted into the inside of the cable, and the core wires a, a are placed one on top of the other. after that,
Using a crimping tool or crimping mechanism, attach the insulation jacket 4.
If the metal substrate 1 is compressed from the outside, the core wires a, a
The metal substrate 1 is plastically deformed in the polymerized state. In this state, the core wires a and a are directly crimped and connected, and the connection position is fixed. Therefore, when heating is applied thereafter, the brazing alloy 3 melts from within the small hole 2 and enters the connecting portion of the core wires a and a to braze. Although it takes several seconds for the brazing alloy 3 to solidify after melting, since the connection position is already fixed, the connection can be made without any misalignment.

To be more specific, as shown in FIG. 3B, in the small hole group 2A located at the overlapping part of the core wires a and a, a suction effect is exerted due to the gap between the core wires a and the overlapping part, so that the inside of the small hole group 2A is The brazing alloy flows into the overlapping portion and mainly brazes the core wires together. On the other hand, in the small hole group 2B that is in close contact with the arc surface of the core wire a, the brazing alloy 3 remains in the small hole group 2B, mainly between the metal substrate 1 and the core wires a, a. Do the following. Moreover, since the metal substrate 1 is tightly crimped to the core wires a, a, a complete connection is achieved. In this case, the insulating jacket 4 is thermally deformed and conforms to the outer shape of the connection part, but when heat-shrinkable synthetic resin is used, it conforms well, especially in the part where the metal substrate 1 is not covered. shrinks along the outer shape of the insulation coating b. The heating is completed almost instantaneously using high frequency heating.

In the above, a method of heating after crimping has been described, but a method of heating simultaneously with crimping using a heating iron or the like may also be used. Further, although the drawings show the cables connected from opposite directions, the cables can be connected in the same way from the same direction. Furthermore, it does not prevent use without using the insulating jacket 4.

According to this embodiment, the core wires a, a can be easily inserted from above the U-shaped opening of the metal substrate 1, and there is an advantage that brazing can be performed mechanically.
Moreover, it is sufficient to cover the metal substrate 1 with the insulating jacket 4 at the time of connection and use, and there is no need to manufacture the connecting tool in advance.

FIG. 4 shows another embodiment, and FIG. 4A is a perspective view showing a connector configured in the shape of a cylindrical sleeve;
Figure B is a longitudinal sectional view showing the connected state.

In the figure, 5 is a metal substrate bent and formed into a cylindrical sleeve shape, 6 is the free end of the metal substrate 5 butted against the cylindrical arc surface, 7 is a cylindrical insulating jacket, 8
are the reduced diameter portions at both ends in the axial direction. For connection, the core wires a, a are inserted from opposite directions or from one direction, respectively, and then crimped. As the metal substrate 5 is crimped, the diameter of the metal substrate 5 is easily reduced due to the presence of the free ends 6, 6, and the metal substrate 5 is tightly crimped. When the free ends 6, 6 are overlapped and crimped together, the free ends 6, 6 can be firmly soldered to each other. Although not shown, a structure in which free ends of metal substrates are connected can also be implemented.

FIG. 5 is a partially omitted enlarged sectional view showing another example of the impregnated portion.

In the figure, reference numeral 9 indicates a depression as an impregnation part provided on one side of the metal substrate 10, and is formed by knurling or other surface roughening means.
is impregnated. The metal substrate 10 can be formed into a sleeve shape in the same manner as described above, with the recess 9 on the inside.

As mentioned above, we have explained the case where the metal substrate is bent and formed into a sleeve shape in advance.
The present invention includes a method of bending and forming a flat metal substrate into a sleeve shape after inserting a core wire. In the latter case, the metal substrate and the insulating film can be supplied at the same time to carry out the mass production process.

According to the present invention, the following effects are achieved.

(1) Since heating is applied after the metal substrates are crimped and the core wires are directly connected and fixed, there is no need to wait for the brazing alloy to solidify, enabling high-speed processing and high reliability. This allows for a reliable connection.

(2) Since it is pre-impregnated with a brazing alloy, it has the advantage that uniform connections can be made regardless of the skill of the brazing technique. In particular, there is no need to insert and hold the brazing alloy in the sleeve as in the past, which saves time and effort.

(3) For the reason (2) above, it is possible to eliminate the gap caused by the brazing alloy before melting, which is the case in the past, so the size of the metal substrate can be made as small as possible, and the connection area can also be reduced. Not only can it be miniaturized, but it can also be suitably implemented for multiple lines.

[Brief explanation of the drawing]

The drawings show an embodiment of the method for connecting cables to each other according to the present invention, and FIG. 1A is a partially cutaway perspective view showing a connecting tool used in the method, FIG. The figure is an enlarged sectional view showing a part of the metal substrate, FIG. 3A is a horizontal sectional view showing the connection state, FIG. FIG. 4A is a perspective view showing a connecting tool configured in the shape of a cylindrical sleeve, FIG. 4B is a longitudinal cross-sectional view showing a connected state, and FIG. 1, 5, 10... Metal substrate, 2, 9... Impregnated part, 3
...Brazing alloy, 4,7...Insulating jacket.

Claims (1)

[Claims] 1. A metal substrate is provided with an impregnated portion for impregnating a brazing alloy, and after inserting a core wire to be connected into the metal substrate, the metal substrate is crimped to fix the core wires to each other, and the crimping is performed. A method of interconnecting core wires in which the brazing alloy is melted by applying heat to the parts. 2. In what is stated in claim 1,
The impregnated part is a small hole drilled in the metal substrate, which is a method for connecting the core wires together. 3 In what is stated in claim 1,
The impregnated area is a recess provided on one side of the metal substrate and is a method for connecting the core wires together.