JPH038029Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lead-free cable connection part of an OF cable.

[Technical background of the invention and its problems]

Conventionally, when connecting a copper pipe and a metal sheath of an OF cable, a lead connection has been generally performed in which the part where the copper pipe and metal sheath are to be connected is kneaded and hardened with semi-molten solder.

Recently, lead-free connections that do not use lead have been used in place of such lead connections.

This lead-free connection part is a connection in which end fittings 2 whose inner surface is formed in the same shape as the corrugation of the metal sheath 1 are fixed to both ends, as shown in Fig. 1, across an insulator connection part (not shown). The copper tube 3 is screwed onto the outer periphery of the metal sheath 1, the elastic packing 4 is brought into contact with the outer end surface of the end fitting 2, and the tightening fitting 5, whose inner surface is formed in the same shape as the corrugation of the metal sheath 1, is elasticized from the outside. It is formed by screwing together toward the packing 4 and tightening the fastening fitting 5 and the end fitting 2 with a tightening bolt 6.

However, in such lead-free connections,
Metal sheath 1 with a corrugated outer periphery and metal sheath 1
There is a risk that a gap G will be formed at the joint surface with the fastening fitting 5, which has an inner periphery having the same shape as the wave shape of It was hot.

Therefore, as shown in FIG. 2a, the conductor braided wire 7
Solder one end to the copper tube 3 and attach the other end to the metal sheath 1
Alternatively, as shown in Fig. 2b, one end of the conductor braided wire 7 is soldered to the copper pipe 3,
A method is used in which the other end is wound around the metal sheath 1 and the outer periphery is tightened with a clamp fitting 8.
In the former case, when the conductor braided wire 7 is soldered to the metal sheath 1, even if the connection part is heated, the inside of the metal sheath 1 is not heated.
Heat is taken away by the OF oil, resulting in poor soldering. In addition, in the latter case, when winding the conductor braided wire 7 around the metal sheath 1, a large amount of the conductor braided wire 7 is required to obtain a good contact surface pressure, and both involve the use of fire, which poses a safety problem. It was hot.

[Purpose of invention]

The present invention has been made to solve these problems, and it is an object of the present invention to provide a lead-free cable connection part that provides a good electrical connection and does not have the above-mentioned drawbacks.

[Summary of the idea]

In other words, the lead-free cable connection part of the present invention is
A connecting copper tube covering a conductor connection part of the cable is oil-tightly fixed to the metal sheath of the cable, one end of a flexible conductor is connected to the connecting copper tube, and the other end of the flexible conductor is connected to the metal sheath. It is characterized in that the outer periphery is tightened with a clamp fitting, and an elastic body is interposed between the other end of the flexible conductor and the clamp fitting.

[Example of idea]

Hereinafter, details of the present invention will be described with reference to an embodiment shown in the drawings.

FIG. 3 is a vertical cross-sectional view showing a lead-free cable connection part according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view thereof. In the following figures, the same parts as in FIGS. 1 and 2 are given the same reference numerals.

In FIGS. 3 and 4, reference numeral 7 indicates a conductor braided wire that connects the metal sheath 1 and the connecting copper tube 3. In FIG. A terminal 1 is attached to one end of these conductor braided wires 7 to fit a bolt 9 provided around the end of the connecting copper pipe 3.
0 is provided and is tightened and fixed with bolts and nuts 9 and 9'. The other end of the conductor braided wire 7 is attached to the metal sheath 1, and a rubber-like elastic sheet 11 having elasticity that closely fits the corrugated shape of the outer periphery of the metal sheath 1 is screwed to the outer periphery of the wire. A clamp fitting 8 is disposed around the outer periphery and is fastened with bolts and nuts 12, 12'.

The cable lead-free connection section configured in this way is formed as shown below.

That is, first, the terminal 10 provided at one end of the conductor braided wire 7 is fastened to the bolt 9 provided around the end of the connecting copper tube 3 at a plurality of locations with a nut 9'.

After that, the other ends of the conductor braided wires 7 are respectively attached to the outer periphery of the metal sheath 1, and a rubber-like elastic sheet 11 having elasticity that tightly adheres to the corrugated shape of the outer periphery of the metal sheath is screwed together. Clamp fitting 8
The bolts and nuts 12, 1 are arranged so that the metal sheath 1 and the conductor braided wire 7 are in sufficient contact with each other.
2' to provide a connection with sufficient contact surface pressure.

As described above, the lead-free cable connection part of the present invention uses a terminal for the connection on the copper pipe side and a highly elastic rubber-like elastic sheet for the connection on the metal sheath side, so a reliable electrical connection can be achieved. and can easily form connections. Furthermore, since it does not require soldering like conventional methods, it is also highly safe.

[Effect of idea]

As explained above, according to the lead-free cable connection part of the present invention, since no soldering is used at the connection point, there is no connection failure, and since no flame is used, it is excellent in safety, and the connection part can be formed easily. It has good workability.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing a conventional cable-free connection, Figure 2 is a front view of a conventional cable-free connection, and Figure 3 is a vertical cross-section showing a cable-free connection of the present invention. , FIG. 4 is a cross-sectional view thereof. DESCRIPTION OF SYMBOLS 1...Metal sheath, 2...End fitting, 3...Connecting copper tube, 4...Elastic packing, 5...Tightening fitting, 6...Tightening bolt, 7...Conductor braided wire, 8...
...Clamp fitting, 11...Rubber-like elastic sheet.

Claims (1)

[Scope of utility model registration request] A connecting copper tube covering a conductor connection part of the cable is oil-tightly fixed to the metal sheath of the cable, one end of a flexible conductor is connected to the connecting copper tube, and the other end of the flexible conductor is connected to the metal sheath. 1. A lead-free cable connection section, characterized in that the outer periphery of the cable is tightened with a clamp fitting, and an elastic body is interposed between the other end of the flexible conductor and the clamp fitting.