JPH11329096A - Armored cable - Google Patents

Abstract

(57) [Problem] There is a demand for a cable to be wired in a machine that moves rapidly, such as in a car, and that has excellent flexibility and is guaranteed to be safe for use. SOLUTION: An insulating layer coated with a conductor is formed by spirally winding a first metal strip on the insulating layer and forming a second metal strip outside the spirally wound first metal strip. Gap-winding the metal strip in a reverse spiral with the first metal strip, and if necessary, further winding the n-th metal strip in the reverse spiral with the spiral winding direction of the lower strip. An armored cable characterized by being protected by an armored structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armored cable for laying a communication cable, a control cable, a power supply cable, and the like in an in-vehicle such as an automobile.

[0002]

2. Description of the Related Art Communication cables, control cables, wire harnesses, power supply cables, and the like, which are wired in equipment such as automobiles, are devices having particularly sharp corners in order to move according to the vibration of the equipment. If it is wired in contact with a sharp or sharp point, the cable coating will be damaged and the conductor will be exposed, causing an electrical leakage accident, and even in places where movement is severe, there is a danger of accidents such as the cable being cut . As one of the countermeasures, conventionally, as shown in FIG.
Is spirally gap-wound, and the second metal band 24 is spirally gap-wound in the same direction as the winding direction of the first metal band 23 from above.
Protecting one. The gap portion 25 of the first metal strip 23 is generally about 1/3 or less of the width of the metal strip, and the width of the overlap between the first metal strip and the second metal strip is equal to the width of the strip. It is about 1/2 or less of the width. In the figure, reference numeral 30 denotes a sheath layer for protecting the armor 22.

[0003]

However, the armor 22 is formed by spirally winding the above-mentioned metal band in two steps in the same direction.
There is a problem that the conventional armored cable protected by the above is difficult to bend. That is, when the armored cable is bent by drum winding or laying at the time of manufacture and transportation, as shown in FIG. 6, the first metal band forming the armor 22 is formed at the inner portion where the cable is bent as shown in FIG. As shown in FIG. 7, a force 26 is applied to the body 23 by an end portion 27 of the second metal band 24 wound around the body 23 so as to be concaved so as to draw an arc in the longitudinal direction of the band 23. On the other hand, in the bent outer part,
As shown in FIG. 8, the second metal band 24 constituting the second metal band 24 is formed so as to draw an arc in the longitudinal direction of the band 24 by the end 28 of the first metal band 23 wound below the second metal band 24. Depressing force 2
9 acts. These concave forces 26 and 29 act in a direction perpendicular to the longitudinal direction of the metal strip, and exert almost no force in the longitudinal direction. Therefore, this force becomes resistance to bending, and since the force for denting such a metal band is very large, an armored cable in which a metal band is spirally wound in the same direction is difficult to bend, and the bending radius is small. Was a major drawback.

[0004]

According to a first aspect of the present invention, there is provided an insulating layer covering a conductor, a first metal strip is spirally gap-wound on the insulating layer, and the gap is spirally wound on the insulating layer. A second metal strip outside the first metal strip thus formed;
Characterized in that the armored cable is protected by an armor made by winding a gap in a reverse spiral with the metal band. Also, the second invention of the present application is a method of forming a first metal strip spirally gap-wound on a first metal strip by spirally winding an insulating layer covering a conductor on the insulating layer. A second metal strip is wound on the outside in a reverse spiral spiral shape with the first metal strip, and if necessary, an n-th metal strip is further spirally wound on the lower metal strip in a reverse spiral direction. An armored cable characterized by being protected by an armor wound in a gap shape.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows an embodiment of the present invention, wherein 1 is a cable insulating layer, and 2 is an armor for protecting the cable insulating layer 1. The cables protected by the armor include communication cables, control cables, wire harnesses, power supply cables, and the like. Reference numeral 3 denotes a first metal strip spirally wound on the cable insulating layer 1 and formed of a thin metal plate such as steel, copper alloy, or brass. The first metal strip 3 is placed on the cable insulating layer 1 with a width of the metal strip 1.
A gap 31 of is provided and spirally wound. Reference numeral 4 denotes a metal strip formed by winding a gap on the first metal strip 3 with a spiral opposite to the winding direction of the metal strip 3, and the width of the gap 41 is one width of the metal strip as in the lower layer. / 3
It has become. The material of the second metal strip 4 is the same as that of the first metal strip 3.

Reference numeral 5 denotes a third metal band wound around the metal band 4 as necessary, and the gap is wound in a spiral in a direction opposite to the lower spiral. The reason for providing the metal strip 5 is that the strength of the armor 2 is reinforced and the first and second metal strips 5 are used.
When the armoring 2 is composed of the metal strips 3 and 4 of FIG. 1, a diamond-shaped space 6 is generated as shown in FIG.
The whole can be protected by the armor 2 made of a metal band. When it is necessary to further protect the cable insulating layer 1 more strongly, the metal band may be wound into a plurality of layers (n layers). Even in such a case, the lower winding direction and the upper winding direction may be used. Of course, the winding direction is reversed. In the figure, reference numeral 7 denotes a sheath layer for protecting the armor 2.

[0007] As described above, when the cable of the present invention is wound with a plurality of layers (n layers) with the spiral direction wound around the metal band on the cable insulating layer 1 in the opposite direction, the cable is bent as shown in FIG. In the inner part, the lower metal strip (first metal strip 3 in the figure) is connected to the upper metal strip (second metal strip in the figure).
As shown in FIG. 3, a force 43 acts on the lower metal strip (3) toward the cable insulating layer 1 as shown in FIG. On the other hand, in the bent outer portion, the end 32 of the lower metal band (3) hits the upper metal band (4), and the upper metal band (4) has a cable insulation as shown in FIG. It acts as a depressing force 33 towards the side opposite to the layer 1.

As shown in FIGS. 3 and 4, this force acts as a concave force so as to draw a straight line in the width direction of the metal strip, and the concave length due to the concave force is shown in FIGS. The length of the dent acting on the conventional same-direction winding armor 22 is substantially the same as that of the dent. However, the direction of the force applied to the metal strip is the force in the longitudinal direction of the metal strip in the armor 2 of the present invention. The force acting as the longitudinal direction of the metal strip is weakened by the longitudinal movement of the metal strip.
That is, the concave force is dispersed by the movement of the metal band in the longitudinal direction, and the resistance force of the end portion of the metal band acting on the armor by bending is smaller than that of the conventional unidirectional armor. The resistance difference when the cable is bent is reduced by this difference in the force, and the cable is easily bent.

According to the present invention, as described above, the spiral winding direction of the lower metal band and the spiral direction of the metal band wound thereover are reversed, so that the cable is easily bent and can be bent with a small curvature. Can be.

[0010]

As described in detail above, according to the present invention,
Control cables for wiring in intense machines such as automobiles and cables with armor, such as wire harnesses, can be easily bent and reduced in bending radius, so that they can be wound on small-diameter drums. Even in the case of laying, there is an excellent industrial effect such as the restriction by bending is eased.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a bent state of the armored cable of the present invention.

FIG. 3 is an explanatory view schematically showing a dent force applied to an outer metal band in a state where the armored cable of the present invention is bent.

FIG. 4 is an explanatory view schematically showing a dent force applied to a metal band located inside in a state where the armored cable of the present invention is bent.

FIG. 5 is an explanatory view showing a conventional armored cable.

FIG. 6 is an explanatory view showing a bent state of a conventional armored cable.

FIG. 7 is an explanatory view schematically showing a dent force applied to an outer metal band in a state where a conventional armored cable is bent.

FIG. 8 is an explanatory view schematically showing a dent force applied to a metal band located inside when a conventional armored cable is bent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable insulating layer 2 Armor 3 1st metal strip 4 2nd metal strip 5 3rd metal strip 7 Sheath layer

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Susumu Kiyoshi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (2)

[Claims] 1. An insulating layer covering a conductor, a first metal band is spirally gap-wound on the insulating layer, and a second metal band is formed on the outside of the spiral gap-wound first metal band. The armored cable characterized in that the metal band of (1) is protected by an armor formed by winding a gap around the first metal band in a reverse spiral shape. 2. An insulating layer covering a conductor, a first metal strip is spirally gap-wound on the insulating layer, and a second metal strip is formed on the outside of the spiral gap-wound first metal strip. And the first metal strip is spirally wound in a reverse spiral shape, and if necessary, the n-th metal strip is further gap-winded in the reverse spiral direction with the spiral direction of the lower strip. An armored cable characterized by being protected by an armored armor.