JPH04215212A - Shield type twisted cable and connecting device thereof - Google Patents

Abstract

PURPOSE:To obtain a shield type twisted cable for improving the labor effectiveness of terminal processing of an outer shielding braided wire, and obtain a connecting device for connecting this cable to an electric connector or the like to be used. CONSTITUTION:An insulating inner cover 16 is located in the periphery of at least a pair of twisted insulated wires 12, 14, and a shielding braided wire 18 is fitted to the outer surface of the insulating inner cover 16 for fixation by adhesion or welding, and furthermore, the periphery thereof is covered with an insulating outer cover 20 to form a shield type twisted cable 10. At the time of connecting a conductor to the braided wire 18 of the end of this shield cable 10, a part of the braided wire 18 is exposed, and an inside ferrule 22 is inserted between the twisted wires 12, 14 and the inner cover 16, and a conductor to be connected is made to contact to the exposed braided wire 18, and an outside ferrule 20 is covered from the outside, and pressure-welding caulking work is performed for connection. Workability is improved by the inner cover, to which outer surface the braided wire is fitted for fixation, and short-circuit or the like to be caused by scattering of the cut braided wire is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shielded cables, and more particularly to shielded twisted cables and connection devices for the cables.

0002

[Prior Art] Signal connection cables for car stereos and other audio equipment used in automobiles and other noisy environments, or for engine control equipment that uses a microprocessor, are shielded (silent shielding) to avoid interference with noise. It is necessary to prevent deterioration in sound quality or malfunction. Therefore, generally shielded twisted cables have come to be widely used as signal transmission lines in such electronics sections. For example, twisted 2
An insulating jacket is formed around the outer periphery of a single insulated wire, that is, a twisted pair wire, via a braided wire.

Various proposals have been made for connection mechanisms and methods for connecting a braided wire at one end of a general coaxial cable or the like to another conductor or another similar braided wire such as a coaxial cable. One technique is to remove the jacket to expose the braided wire;
The exposed braided wire is folded back onto the outer sheath and connected by caulking with a metal sleeve or the like. Other techniques are
As disclosed in Japanese Patent No. 9381, the outer sheath is removed and the exposed braided wire is wrapped in a conductive sheet or the like and connected.

0004

However, in the case of a shielded twisted cable including a plurality of twisted insulated wires as described above, the outer shape of the twisted wires is a complicated shape other than a perfect circle. There was a problem in that it was difficult to manufacture the braided wire and connect the cable.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel shielded twist cable and its terminal connection device that overcomes the above drawbacks.

[0006]

[Means for Solving the Problems] According to the present invention, an inner sheath having a substantially circular outer periphery is provided on the outside of a plurality of twisted insulated wires, and preferably a braid is fixed to the outer surface of the inner sheath with an adhesive or the like. A shielded twisted cable is obtained with a wire and a jacket on its outer surface.

Further, according to the present invention, the outer sheath at the end of the shielded twisted cable described above is removed to expose the braided wire, and an annular inner ferrule is inserted between the twisted insulated wire and the inner sheath, and the exposed braided wire is removed. Contact the conductor to be connected to the outer periphery,
A connecting device for a shielded twisted cable is obtained, in which an annular outer ferrule is inserted and fixed by crimping.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing one end of a shielded twisted cable 10 according to the present invention. In this particular embodiment, it is a twisted pair of wires having two twisted insulated wires 12,14. Each insulated wire 12, 14 has a core 13, 15 consisting of a number of copper strands covered with insulation coatings of different colors, preferably red and white, similar to conventional wires. Such twisted insulated wire 1
Instead of the prior art technique of placing braided wire directly around the complex shape of wires 2 and 14, the present invention places an inner sheath 16 made of insulating plastic, which may be PVC. This inner cover 16 has a substantially perfect circular outer surface, and the braided wire 18 is fixedly attached to the outer surface. In a preferred embodiment, a thin adhesive is applied to the outer surface of the inner jacket 16 to securely secure the braided wire 18 thereto. If necessary, the outer surface of the braided wire 18 or the inner sheath 16 may be heated to thermally fix the two. Conventionally on the outside of the braided wire, e.g. PV
A shielded twisted cable 1 is formed by forming an outer sheath 20 of C.
Complete 0.

FIG. 2 is a schematic partial sectional view illustrating a connection device at one end of the shielded twisted cable 10 of FIG. 1. As shown in FIG. Figures (A) and (B) show a longitudinal cross-sectional view and a cross-sectional view, respectively. As is clear from the figure, the outer sheath 20, the braided wire 18 and the inner sheath 16 at one end of the shielded twisted cable 10
are cut to expose a predetermined length of the twisted insulated wires 12 and 14, and the twisted insulated wires 12, 14 are connected by known techniques such as pressure welding, crimping, or soldering as needed, although not shown. Furthermore, the outer covering 20 is removed,
A predetermined length of the braided wire 18 is exposed.

Next, a hard annular inner ferrule 22 made of metal, for example, and having approximately the same length as the exposed length of the braided wire 18 is inserted between the twisted insulated wires 12 and 14 and the inner sheath 16. after that,
A conductor 24 to be connected, such as a relatively flexible metal plate, is arranged on the outer surface of the exposed braided wire 18, and an annular outer ferrule 26, which is preferably longer than the inner ferrule 22, is arranged on the outer surface of the exposed braided wire 18.
The shielded twisted cable 10 and the conductor 24 to be connected are crimped (crimped) to fix the connection.

According to this connection technique, even if the twisted insulated wires 12 and 14 have a complicated external shape, they can be easily connected to the conductor 24 to be connected because the inner sheath 16 makes them approximately circular. be. What is also noteworthy is that the inner coat 16
Since the braided wire 18 is adhered and fixed, short cut pieces of the braided wire 18 will not be scattered when cut. When such cut pieces of the braided wire 18 get mixed into electronic equipment or parts, they cause short circuits and the like, causing failures of the equipment, but it is possible to eliminate such causes. Furthermore, due to the presence of the inner sheath 16, the twisted insulated wire 12 can be twisted when the braided wire 18 is cut.
, 14 and facilitates the insertion work of the inner ferrule 22.

FIG. 3 illustrates one embodiment of an electrical connector 30 that utilizes the shielded twisted wire or cable 10 described above in connection with FIGS. The electrical connector 30, in this particular embodiment, has an insulating housing 35 having two terminal receiving openings 32, 34, and a two-piece metal shielding case 36, 37 surrounding the outer periphery of the insulating housing 35. Each of the shield cases 36 and 37 has a plurality of openings 36a and 37a, which fit into projections 38 formed on the outer surface of the insulating housing 35, respectively. The rear ends of the shield case bodies 36 and 37,
That is, the cable 10 side has gutter-like parts 36c and 37c via substantially funnel-like parts 36b and 37b.

The terminal receiving openings 32, 34 of the insulating housing 35 of the electrical connector 30 insert and hold terminals 40, 42 having, for example, well-known press-fit connections. The twisted insulated wires 12, 14 of the cable 10 are press-connected to the press-contact portions of the terminals 40, 42 by a well-known method. Braided wire 18 and gutter-like portions 36c, 3 of shield cases 36, 37
7c is the same as explained in FIG.
6c and 37c are brought into contact with the outer periphery of the exposed braided wire 18,
After that, it is covered with an external ferrule 26, and this is crimped (crimped). As a result, the electrical connector 30
has a completely shielded structure.

FIG. 4 is a perspective view of the electrical connector 30 of FIG. 3 turned upside down and viewed from the front (fitting surface) side. This electrical connector 30 has a pair of receptacle terminals 40 and 42 each held in an opening on the front surface. Furthermore, a cantilever-like elastic latch arm 44 is provided in the valley at the center of the top surface and is integrally formed with the insulating housing 35. This latch arm 44 includes a pressing operation part 46 and a latch engaging part 4.
It has 8.

FIGS. 5A and 5B show a perspective view and a front view, respectively, of a female connector 50 into which a plurality of (two in the illustrated example) electrical connectors 30 of FIG. 4 can be inserted and connected. The female connector 50 includes an insulating housing 56 having a mounting portion 52, two cavities 53, 54 for receiving the electrical connector 30, and a post terminal 55. A metal shield cover 58 is provided around its outer periphery. This shield cover 58 has a plurality of contact pieces 59 protruding into the cavities 53 and 54.
are provided and come into contact with the shielding case 37 of the electrical connector 30 inserted into the cavities 53, 54.

Since the electrical connectors 30 and 50 shown in FIGS. 3 to 5 have substantially trapezoidal mating surfaces, there is no possibility of the electrical connectors being installed and inserted upside down. Although not shown, shoulders are formed on the upper surfaces of the cavities 53 and 54 to engage with the latch engaging portions 48 of the latch arms 44 of the electrical connector 30.

The preferred embodiments of the shielded twist cable of the present invention, the connection device for this cable, and the electrical connector using this cable have been described above in detail. However, it will be understood that the present invention should not be limited to these embodiments, and that various modifications and changes can be made depending on the specific application without departing from the gist of the present invention. For example, the braided wire 18 does not need to be applied over the entire surface of the inner sheath 16, but may be adhered or welded at points or lines at predetermined intervals.

[0019]

As can be understood from the above description, according to the present invention, a braided wire is provided on the outer periphery of a plurality of twisted insulated wires via an inner sheath having a substantially perfect circular outer surface. It is characterized by being adhered and fixed to the inner jacket. Therefore, the workability of connecting such a shielded twisted cable to an electrical connector or the like is extremely excellent. That is, the inner ferrule can be easily inserted inside the braided wire via the inner sheath. Moreover, since the cut braided wire is adhered and fixed to the outer surface of the inner sheath, it is possible to effectively prevent the cut short braided wire pieces from scattering and causing trouble to electronic equipment and the like.

Furthermore, the braided wire of such a shielded twisted cable can be easily connected by simply crimping it using the inner and outer ferrules, without folding back the exposed braided wire or adding any other special work steps. It is also reliable and allows existing crimping tools to be used.

Therefore, it is particularly effective when applied to shielded electronic equipment used in noisy environments such as automobiles.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one end of an embodiment of a shielded twisted cable according to the present invention.

FIG. 2 is a partial cross-sectional view showing an embodiment of the shielded twist cable connection device shown in FIG. 1;

FIG. 3 is an exploded perspective view of one embodiment of the electrical connector using the shielded twisted cable of FIG. 1;

FIG. 4 is an assembled perspective view of the electrical connector of FIG. 3;

FIG. 5 is a diagram showing a mating connector that mates with the electrical connector of FIG. 4;

[Explanation of symbols]

10 Shielded twisted cable 12, 14 Insulated wire 16 Inner jacket 18
Braided wire 20
Outer cover 22 Inner ferrule 26 Outer ferrule 24, 36, 37 Connected conductor

Claims (2)

[Claims] Claim 1: A plurality of twisted insulated wires, an inner sheath having a substantially perfect circular shape and arranged around the outer periphery of the twisted insulated wires, and a shielding braid attached to the outer periphery of the inner sheath. A shielded twist cable comprising: a wire; and a jacket provided around the outer periphery of the braided wire. 2. A shielded twisted cable having an inner sheath, a shielding braided wire, and an outer sheath sequentially formed around the outer periphery of a plurality of twisted insulated wires, and removing the outer sheath from at least one end of the cable, a hard annular inner ferrule inserted between the insulated wire and the inner sheath; and an annular outer ferrule arranged around the outer periphery of the exposed braided wire at one end of the cable via a connected conductor. A connecting device for a shielded twisted cable, characterized in that the outer ferrule is crimped to connect the braided wire and the conductor to be connected.