JPH07192540A - Movable cable - Google Patents

Abstract

PURPOSE:To prevent disconnection due to the buckling of a conductor by making the conductor difficult to be bent at a small bending radius, that is, forming the whole conductor harder, through utilizing the rigidity of a fiber-reinforced plastic wire. CONSTITUTION:A conductor 1a is constituted of a substance wherein many tin-plated soft copper wires and a reinforced wire 1c composed of a fiberreinforced plastic wire are bundled to be collectively twisted in a same direction. Plural threads of insulated wire cores 1 are twisted together with an inclusion 4, and a cabtire sheath 2 is extrusion-coated on the outer side of the insulated wire cores via a presser tape 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving cable, and more particularly to a moving cable having a reinforcing wire in a conductor.

[0002]

2. Description of the Related Art Generally, there are a reel winding system and a curtain system wiring system as a power supply system for industrial mobile equipment such as a crane, and a cabtire cable having a special structure is used according to these applications. . As such a cabtire cable, for example, as shown in FIG. 3, an insulating core 1 composed of a conductor 1a and a rubber insulator 1b provided on the outer periphery of the conductor 1a, and a plurality of insulating cores 1 It is known that it is composed of a cabin tire sheath 2 provided outside the twisted body and a reinforcing layer 3 embedded in the middle of the cabin tire sheath. In the figure, reference numeral 2
a is a lower sheath, 2b is an upper sheath, 4 is an inclusion, and 5 is a holding tape.

[0003]

By the way, in the cabtire cable having such a structure, when the conductor 1a has a small size, there is a possibility that the conductor 1a may be broken due to pulling or bending during use of the cabtire cable. It was

Therefore, for a cable used under severe conditions such as a reel winding method, a steel wire is inserted into the conductor 1a to increase the tensile strength of the conductor 1a.

However, even if a steel wire is inserted into the conductor 1a to increase the tensile strength of the conductor 1a, the rigidity of the conductor 1a as a whole does not improve so much, so that the conductor buckles and eventually breaks.

The present invention has been made in order to solve such a problem, and improves the rigidity and tensile strength of the conductor, and prevents the disconnection of the conductor due to buckling and the disconnection of the conductor due to excessive tension. The purpose is to provide.

[0007]

The moving cable of the present invention is a moving cable having a sheath on the outer side of an insulating core formed by providing an insulator on the outer periphery of a conductor, wherein the conductor has a large number of conductors and a high conductor. It is characterized by being made up of a combination of a reinforcing wire having rigidity and high tensile strength.

[0008]

In the moving cable of the present invention, the conductor is composed of a large number of conductor wires and a reinforcing wire having high rigidity and high tensile strength, which are twisted together. Will be raised. When the rigidity of the conductor is increased, it becomes difficult to bend even when the size of the conductor is small, and as a result, buckling of the conductor is less likely to occur, which in turn makes it possible to prevent disconnection of the conductor due to buckling. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross sectional view showing an embodiment of the moving cable of the present invention, and FIG. 2 is a cross sectional view showing another embodiment of the moving cable of the present invention. 1 and 2, the same parts as those in FIG. 3 are designated by the same reference numerals. In FIG. 1, reference numeral 1 indicates an insulated wire core,
The insulating core 1 is composed of, for example, a conductor 1a and an insulator 1b made of a rubber / plastic material such as natural rubber, ethylene propylene rubber or vinyl chloride resin extruded on the outer periphery of the conductor 1a. In addition, conductor 1
A separator may be provided on the outer periphery of a, if necessary.

The conductor 1a has a thin conductive wire, for example, a wire diameter of 0.
A large number of 45 mm tin-plated annealed copper wires and a high-rigidity and high-strength reinforcing wire 1c that are assembled together in the same direction. The stranded wire conductor is concentrically formed, or the reinforcing wire 1c is wound around with a plurality of lead wires made of tin-plated annealed copper wire or the like. As the reinforcing wire having high rigidity and high tensile strength, a so-called fiber reinforced plastic wire in which glass fiber, carbon fiber or the like is dispersed in plastic to be reinforced and lightweight is preferable.

However, a plurality of insulated wire cores 1 are twisted together with inclusions 4 such as jute, and on the outside of this, from a rubber / plastic material such as polychloroprene rubber or vinyl chloride resin via a holding tape 5. The cabtire sheath 2 is formed by extrusion coating. FIG. 2 shows another embodiment of the present invention. In this embodiment, the conductor 1
Not only a, but also the reinforcing wire 1c is arranged at the center of the twisted gap of the insulated wire core 1. In addition, it is desirable to provide a coating layer 1d such as rubber on the outer periphery of the reinforcing wire 1c. This embodiment has an advantage over the cabtire cable shown in FIG. 1 in that the rigidity of the cable can be further increased and the disconnection of the cable can be prevented.

In the above-described embodiment, the case where the intertwisting gap of the insulating core is filled with the inclusions and the holding tape is provided outside the twisted body is described.
The present invention is not limited to this, and the lower sheath may be extrusion-coated in a tight manner in the twisted gap of the insulating wire core to omit the inclusions and the holding tape, and the middle of the cabtire sheath may be omitted. You may provide the reinforcement layer which consists of canvas etc.

In the moving cable having such a structure, the rigidity of the fiber-reinforced plastic wire is utilized to make it difficult for the conductor to be bent with a small bending radius, that is, because the entire conductor is made harder. It is possible to prevent disconnection due to buckling of the conductor. Further, since the fiber-reinforced plastic wire has a high tensile strength, there is no fear that the conductor will be broken even if an excessive tension acts on the cabtire cable.

[0015]

As described above, in the moving cable of the present invention, the rigidity of the conductor forming the insulated core is further increased, so that the conductor becomes difficult to bend, and eventually the conductor due to buckling is used. It becomes possible to prevent disconnection. Further, since the tensile strength of the conductor is also increased, there is an advantage that the conductor is not easily broken.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a moving cable of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the moving cable of the present invention.

FIG. 3 is a cross-sectional view showing an example of a conventional moving cable.

[Explanation of symbols]

 1 ... Insulated wire core 1a ... Conductor 1b ... Insulator 1c ... Reinforcing wire 2 ...... Cabtyre sheath 4 ...

Claims (1)

[Claims] 1. A moving cable having a sheath on the outer side of an insulated wire core formed by providing an insulator on the outer periphery of a conductor, wherein the conductor twists a large number of conductor wires with a reinforcing wire having high rigidity and high tensile strength. A moving cable, which is characterized by being composed of