JPH11329090A - Wire having excellent terminal workability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the terminal workability of a wire while facilitating the peeling work without degrading the strength of a sheath layer by providing the sheath layer for housing an insulated conductor with a slit for dividing the sheath layer into two layers in the thickness direction, and forming a tip thereof with a thin rippable part. SOLUTION: Three pairs of insulated conductors respectively formed of a conductor 5 and an insulator 6 are housed in a sheath layer 1 with an interposed material 7 so as to form a wire. A part of this sheath layer 1 in the circumferential direction is formed with a slit 2 from a surface so as to divide the sheath layer 1 into two layers in the thickness direction thereof. Furthermore, a tip of the slit 2 is made to bite into the sheath layer 1, and a thin part 3 having a thickness at a half or less of the thickness of the sheath layer 1 is formed in the sheath layer 2 so that it can be easily ripped by hands. With this structure, the thin part 3 is protected so as to prevent the degradation of the strength of the sheath layer 1, and in the case of the terminal work of the wire, the sheath layer 1 is easily ripped at the thin part 3 thereof so as to be peeled from inside, and the insulator 6 is eliminated so as to expose the conductor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire having good end workability. More specifically, the present invention relates to a sheathed wire in which an insulated conductor group is housed, and more particularly to an electric wire having improved terminal workability and good terminal workability.

[0002]

2. Description of the Related Art In general, after laying an electric wire, it is necessary to strip off a sheath layer or an insulator at a terminal portion to expose a conductor, and these operations are called terminal processing.

FIG. 5 is a cross-sectional view of a conventional electric wire having good terminal workability. 3 composed of a conductor 11 and an insulator 12
A set of insulated conductors together with an interposer 13 are housed by a sheath layer 14. A slit 15 is provided on the outer periphery of the sheath layer 14. The cross-sectional shape of the slit 15 has various shapes such as a rectangle and a triangle, and is provided continuously in the longitudinal direction of the electric wire. The shape and size of the cross section are determined by the thickness of the electric wire, the thickness of the sheath layer 14, and the like. In FIG. 5, the slit 15 having a triangular cross-section is
It is provided in the place.

[0004] When processing the terminal, the slit 1
After making a cut in 5 with a knife or the like, the sheath layer 14 is peeled off by hand, and processing of the terminal is advanced. The number of the slits 15 may be any number, and the slits 15 may be inside the sheath layer 14. Further, the number of insulated conductors is shown for three cases, but the same applies to any number of insulated conductors.

[0005]

The conventional electric wire with good end workability has the following problems.

(1) The operation of peeling off the sheath layer for terminal processing is usually performed using a knife or a terminal processing machine, and the knife is used to cut a slit provided on the surface or inside of the sheath layer to cut the sheath layer. The work of stripping the layer is a work that requires skill because there is a possibility that the insulator inside the electric wire may be damaged. Therefore, the cost of terminal processing has been high.

(2) A method using a terminal processing machine requires a dedicated device, and is not suitable for work at a construction site.

(3) Since a slit is provided in the sheath layer, the strength of that portion is deteriorated, and when lateral pressure is applied to the electric wire, a crack is formed in the longitudinal direction of the slit, and water enters the inside of the electric wire. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide an electric wire which is easy to strip off the sheath layer and has good terminal workability without deterioration of the strength of the sheath layer. .

[0010]

According to the present invention, in order to achieve the above object, in an electric wire provided with a sheath layer, the sheath layer is formed in a part of the sheath layer in the circumferential direction so that the sheath layer extends from the surface in the thickness direction. A slit was formed so as to be divided into layers, and a thin portion capable of being torn was formed at the tip of the slit.

The sheath layer divided into the two layers may have a total thickness greater than the thickness of the sheath layer.

Furthermore, the sheath layer divided into two layers may be provided with a concave portion and a convex portion, respectively, to form a hook portion.

Further, the portion of the sheath layer divided into two layers and the thin portion may be provided at two places on the outer periphery of the sheath layer.

[0014]

FIG. 1 is a sectional view showing a first embodiment of an electric wire having good terminal workability according to the present invention. The structure is such that three insulated conductors including the conductor 5 and the insulator 6 are housed in the sheath layer 1 together with the intervening 7. Sheath layer 1
Are provided with slits 2 from the surface of the sheath layer 1 so as to have the following features.

(1) The tip of the slit 2 is cut into the sheath layer 1 so that the thin portion 3 exists in the sheath layer 1. The thickness is set to half or less than the thickness of the original sheath layer.

(2) There is a portion where the sheath layer is divided into two layers in the thickness direction of the sheath layer 1.

Since the sheath portion 1 has the thin portion 3, the thin portion 3 can be torn by hand from the inside of the sheath layer 1 at the terminal portion, and the sheath layer 1 can be easily peeled off.

Since there are portions where the sheath layer 1 is divided into two layers, the following effects can be exerted.

(A) The thin portion 3 of the sheath layer 1 can be protected.

(B) The inner insulator can be protected from lateral pressure without reducing the strength of the sheath layer 1.

(C) When the wire is bent or stretched, the thin portion 3 of the sheath layer 1 is formed due to frictional resistance.
To prevent tearing.

(D) The thin portion 3 of the sheath layer 1 is hardly torn at the middle of the electric wire.

Although the above-described two-layered sheet layer portion and the thin portion are provided continuously in the longitudinal direction of the electric wire, they may be provided intermittently as needed.

FIG. 2 is a sectional view showing a second embodiment of the electric wire having good end workability according to the present invention. The total thickness of the sheath layer divided into two layers is larger than the thickness of the original sheath layer 1,
Raised from the surface. With this configuration, the location of the thin portion 3 of the sheath layer 1 becomes clear,
In addition, the protection effect of the thin portion 3 is equal to or more than that of the first embodiment.

FIG. 3 is a sectional view showing a third embodiment of the electric wire having good terminal workability according to the present invention. The hook portion 4 is formed by providing a concave portion and a convex portion on each of the two divided sheath layers. With this catching part 4, 2
The portion of the sheath layer divided into layers is prevented from easily shifting or rolling up, and the thin portion 3 of the sheath layer 1 is prevented from being torn by side pressure.

FIG. 4 is a sectional view showing a fourth embodiment of the electric wire having good terminal workability according to the present invention. This is one in which a portion of the sheath layer divided into two layers and the thin portion 3 of the sheath layer 1 are provided at two opposing positions, and the operation of peeling the sheath layer 1 at the end portion is further facilitated. . The locations where the slits 2 are provided may be two opposing locations as shown in FIG. 4 or two adjacent locations that are close to each other.

[0027]

According to the electric wire with good terminal workability of the present invention, since the sheath layer is provided with a slit from the surface and a portion of the sheath layer divided into two layers and a thin portion, the sheath layer is peeled off. The work can be easily performed, and the strength of the sheath layer is not deteriorated as compared with the case where the slit is simply cut to improve the peeling property.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of an electric wire having good terminal workability according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the electric wire having good terminal workability according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the electric wire having good terminal workability according to the present invention.

FIG. 4 is a cross-sectional view showing a fourth embodiment of an electric wire having good terminal workability according to the present invention.

FIG. 5 is a cross-sectional view of a conventional electric wire having good terminal workability.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheath layer 2 Slit 3 Thin part 4 Hook part 5 Conductor 6 Insulator 7 Interposition 11 Conductor 12 Insulator 13 Interposition 14 Sheath layer 15 Slit

Claims (4)

[Claims] 1. An electric wire provided with a sheath layer, wherein a slit is formed in a part of the sheath layer in the circumferential direction so that the sheath layer is divided into two layers in the thickness direction from the surface, and An electric wire having a good end workability, characterized in that a thin wall portion capable of being torn is formed at a tip portion. 2. The electric wire according to claim 1, wherein the sheath layer divided into two layers has a total thickness greater than the thickness of the sheath layer. 3. The terminal workability according to claim 1, wherein the sheath layer divided into two layers is provided with a concave portion and a convex portion to form a hook portion. Good wires. 4. The terminal workability according to claim 1, wherein a portion of the sheath layer divided into two layers and a thin portion are provided at two places on the outer periphery of the sheath layer. Good wires.