JP2003009331A - End-anchoring device of outer sheath wire for outer sheath cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end-anchoring device of outer sheath wires of an outer sheath cable, which can relieve damages and shearing breaks of the armor wires, even if bending forces are applied to the wires, while being applied with tensile forces. SOLUTION: A device, which anchors ends of a plurality of outer sheath wires having main parts (21) and end parts (12) spread radially from the main parts (21) respectively, includes an anchoring member (14), having a groove (23) which has a bottom surface (22) brought into contact with the end parts (12) of the respective wires (11), and through which the end parts are made to penetrate. At least parts of the bottom surface (22) of the groove (23), which are brought into contact with at least the parts of the end parts on the main part (21) side, are made to warp outward by into convex shapes, at positions which are brought into contact with the end parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal portion retaining device for an armored wire in an armored cable having a plurality of armored wires arranged around a cable core.

[0002]

2. Description of the Related Art For example, in the case of a submarine optical fiber cable laid on the seabed, a plurality of tensile strength members such as steel wires are twisted around an optical fiber unit or an optical fiber tube formed by twisting a plurality of optical fibers. Submarine optical fiber cable is made. When the submarine optical fiber cables are to be connected to each other via a terminal connecting device such as a joint box, the strength member is connected to and retained by the terminal connecting device. As a result, the tensile strength and the torsional strength are taken care of by the tensile strength member so that the optical fiber is not subjected to undue stress. However, when the submarine optical fiber cable is used as a cable core and an armored cable formed by twisting a plurality of armored wires around the cable core is used, the retaining force of the tensile strength member causes a tensile force or a twisting force applied to the armored cable. Since the strength to oppose is insufficient, connect multiple exterior wires to the terminal connection device and hold it,
Supplement the strength of the armored cable connection.

A conventional method of connecting and retaining the above-mentioned armoring wire of an armoring cable having a plurality of armoring wires arranged around it is as follows. As shown in FIG. 4 and FIG. 5 in a cross-sectional state, the terminal portions 12 of the plurality of exterior wires 11 arranged around the cable core 10 are radially expanded, and the terminal portions 12 are provided with a retainer 13.
Each terminal portion 12 is inserted into the groove 15 provided in the retaining member 14 to retain the exterior wire 11, and the retaining member 14 is fixedly attached to a terminal connecting device (not shown).

[0004]

When the bottom surface 16 of the groove 15 provided in the retaining member 14 is subjected to an axial force in the straight direction of the armored cable, that is, a pulling force without applying a bending force, the bottom surface of the outer cable 16 shown in FIG. As shown in FIG. 3, the terminal portion 12 of the exterior wire 11 is formed as an inclined surface that is in contact with the bottom surface 16 and has a constant angle or a parallel angle. As shown in the drawing, when the plurality of exterior wires 11 are arranged in the inner first layer 11A and the outer second layer 11B, the angle of the first layer 11A becomes smaller.

When a bending force is further applied to the armored cable while a tensile force is applied, the intersection of the bottom surface 16 and the end surface 17 of the retaining member 14 becomes a corner as shown in FIG. The portion 18 of the exterior wire 11 corresponding to the corner may be greatly bent and damaged, or may be sheared and broken. A similar situation can occur in an armored cable called a submarine coaxial cable or a submarine power cable, in which a conductor is arranged inside the cable core and the outer circumference of the cable core is twisted with a plurality of armored wires.

The present invention has been made in view of the above problems, and an object thereof is to alleviate the damage and shear fracture of the exterior wire even if a bending force is applied while a tensile force is applied. Another object of the present invention is to provide a terminal portion retaining device for an exterior wire of an exterior cable, which is capable of

[0007]

[Means for Solving the Problems] The present invention has the following constitution in order to solve the above problems. The gist of the invention according to claim 1 is a plurality of armoring wires arranged around a cable core, each armoring wire having a main body portion and a terminal portion radially expanded from the main body portion. A device for retaining the terminal portion of, wherein the outer wire has a bottom surface in contact with the terminal portion, including a retaining member provided with a groove for penetrating the terminal portion, the bottom surface of the groove is at least the A terminal retaining device for an external wire in an external cable is characterized in that a portion of the terminal located on the main body side is in contact with a portion outwardly in the radial direction and is convexly curved. The gist of the invention according to claim 2 is a plurality of armoring wires arranged around a cable core, each armoring wire having a main body portion and a terminal portion radially expanded from the main body portion. A device for retaining the terminal portion of, which has a bottom surface with which the terminal portion of each of the exterior wires is in contact,
Including a retaining member provided with a groove for penetrating the terminal portion,
The bottom surface of the groove has at least two inclined surfaces, a first inclined surface located on the main body side and a second inclined surface located farther from the main body than the first inclined surface. And the angle of the first inclined surface with respect to the axis of the cable core is larger than the angle of the second inclined surface with respect to the axis of the cable core. It exists in the terminal retaining device of the exterior wire in.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that parts or elements that perform substantially the same functions as conventional ones are given the same reference numerals.

Referring to FIGS. 1 and 2 showing a cross section, the terminal retaining device retains the terminal portions 12 of a plurality of exterior wires 11 arranged around the cable core 10 and connects them to the terminal connecting device 20. And includes a retaining member 14. The cable core 10 is a so-called LW cable including an optical fiber unit having a plurality of optical fibers, or a power cable or a coaxial cable in which an electric wire is covered with a cabtire or the like.

The armoring wire 11 is formed by twisting an iron wire and has a main body portion 21 which is in close contact with the cable core 10 and a terminal portion 12 which is radially expanded from the main body portion 21. In this way, when the terminal portion 12 of the exterior wire 11 is radially spread and held, the terminal portion 12 is located away from the cable core 10, so that the holding operation is easy and the terminal portion 12 can be securely held. Easy to secure and secure.

The retaining member 14 has a bottom surface 22 with which the terminal portion 12 of each armoring wire 11 is in contact, and is provided with a groove 23 that penetrates the terminal portion 12, and is machined from a structural material such as carbon steel. You can make it.

In the illustrated embodiment, the terminal portions 12 of the plurality of exterior wires 11 are the inner first layer 11A and the outer second layer 11.
Since it is arranged separately from B, the groove 23 for penetrating the terminal portion 12 of the first layer 11A is provided with the groove 23 of the second layer 11B.
Is formed deeper than the groove 23 that penetrates through. Furthermore, a groove 23 that penetrates the terminal portion 12 of the first layer 11A,
The grooves 23 that penetrate the terminal portion 12 of the second layer 11B are provided alternately in the circumferential direction of the retaining member 14.

The retaining member 14 penetrates the terminal portion 12 of each armoring wire 11 to prevent it from coming off. In the illustrated embodiment, a tubular sleeve is caulked to the terminal portion 12 to serve as a retainer 13. The sleeve is externally threaded and the nut 24 can be screwed into the external thread. The end portion 12 of the armoring wire 11 is inserted into the groove 23, and the nut 24 is inserted into a recess (not shown) provided in the retaining member 14 to prevent the end portion 12 of the armoring wire 11 from being displaced in the radial direction. . Nut 24
When is turned, the sleeve moves back and forth with respect to the nut 24, and the slack of each armoring wire 11 is adjusted to adjust each armoring wire 11
It is possible to make uniform the tensile force applied to.

The bottom surface 22 of the groove 23 of the retaining member 14 is curved in a convex shape outward in the radial direction at a portion in the groove 23 where at least the portion of the terminal portion 12 located on the main body 21 side is in contact. Has been done.

In the illustrated embodiment, the entire bottom surface 22 is curved in a convex shape outward in the radial direction. That is, a virtual plane including the axis of the cable core 10, that is, FIG.
The entire bottom surface 22 is curved so as to be convex outward in the radial direction.

Instead of bending the entire bottom surface 22,
A part of the bottom surface 22 is formed into a linear inclined surface, and a portion of the bottom surface 22 close to the end surface 17 of the retaining member 14, that is, the groove 2
It is also possible to curve the portion of the bottom surface 22 in which the portion of the terminal portion 12 located on the main body portion 21 side in contact with 3 contacts. In this form, the bottom surface 22 is composed of an inclined surface and a curved surface connected to the inclined surface.

When the entire bottom surface 22 is curved, as shown in FIG. 1, when only the pulling force acts on the armored cable, the end portion 12 of the armored wire 11 has one point, preferably the end surface 1.
It is preferable to determine the curvature of the curve so that the curve comes into tangential contact with the curved surface at a point as far as possible from 7. When a part of the bottom surface 22 is an inclined surface and a part is a curved surface, when only the pulling force acts on the armored cable, it is located far from the main body part 21 of the terminal portion 12 of the armored wire 11. The angle of the inclined surface is determined so that the portion contacts the inclined surface.

When the terminal portion 12 of the armoring wire 11 radially expanded from the main body portion 21 is clamped to the retaining member 14 and the retaining member 14 is fixed to the terminal connecting device 20 and brought into a use state, If only the pulling force works,
The terminal portion 12 of the exterior wire 11 is maintained in the state of FIG. If bending force acts on the armored cable in addition to pulling force,
As shown in, the cable core 10 bends, and the terminal portion 12 of the exterior wire 11 bends accordingly. At this time, since the bottom surface 22 of the groove 23 of the retaining member 14 is curved outwardly in a convex shape, the terminal portion 12 of the exterior wire 11 is smoothly curved. Therefore, the possibility that the terminal portion 12 of the exterior wire 11 is greatly bent and damaged or sheared is reduced.

The same action and effect can be obtained in the form of FIG. In FIG. 3 in which the groove is enlarged, the bottom surface of the groove 25 of the retaining member 14 has a first inclined surface 26 located on the main body 21 (FIG. 1) side, that is, the end surface 17 side, and a first inclined surface. It has three inclined surfaces, that is, a second inclined surface 27 located farther from the end surface 17 than the surface 26 and a third inclined surface 28 located farther from the second inclined surface 27. These inclined surfaces are set so that the angle with respect to the axis of the cable core 10 (FIG. 1) becomes smaller in the order of the first inclined surface 26, the second inclined surface 27, and the third inclined surface 28. In this embodiment, the first inclined surface 26 is 30 ° and the second inclined surface 2 is
7 is 20 ° and the third inclined surface 27 is 10 °. The boundary portion 29 between the first inclined surface 26 and the end surface 17 is chamfered, that is, has a rounded portion.

In the embodiment shown in FIG. 3, the bottom surface of the groove 25 is composed of three inclined surfaces 26, 27 and 28 having different angles, and when the bending force is applied, the end portion 12 (FIG. 1) of the exterior wire 11 bends. Between the inclined surfaces 26 and 27, and further the inclined surface 2
Since the angle difference between 7 and 28 is small and the angle formed by the first inclined surface 26 and the end surface 17 is large, it is possible to reduce damage and shear fracture due to extreme bending. The same action and effect can be obtained by providing the bottom surface of the groove 25 with at least two inclined surfaces having different angles.

The present invention is not limited to the above embodiment. For example, the retaining member 14 is formed so as to have an H-shaped cross section, but this can be changed according to the structure of the terminal connecting device 20. Further, the terminal portions 12 of the exterior wire 11 are arranged in the first layer 11A and the second layer 11B, but this may be arranged in a single layer according to the number of the exterior wires 11. In this case, the grooves 23 and 25 of the retaining member 14 have the same depth.

[0022]

According to the present invention, even if a bending force is applied to a sheathed cable while a tensile force is applied to the sheathed cable, it is possible to reduce the occurrence of damage or shear fracture at the end portion of the sheathed wire.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a device for retaining terminal portions of a sheathing wire in a sheathing cable according to the present invention, showing a state in which a pulling force is applied.

FIG. 2 is a cross-sectional view showing a main part of an embodiment of a terminal portion retaining device for a sheathing wire in a sheathing cable according to the present invention, showing a state in which a pulling force and a bending force are applied.

FIG. 3 is an enlarged sectional view showing a modification of three parts of FIG.

FIG. 4 is a cross-sectional view showing a conventional terminal retaining device, showing a state in which a pulling force is applied.

FIG. 5 is a cross-sectional view showing a conventional terminal retaining device, showing a state in which a pulling force and a bending force are applied.

[Explanation of symbols]

10 cable core 11 exterior wire 11A First layer 11B Second layer 12 Terminal 13 retaining 14 Retaining member 15,23,25 groove 16,22 Bottom 17 Edge 18 Exterior wire part 20 Terminal connection device 21 Main part 24 nuts 26,27,28 Inclined surface 29 border

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 15/08 H02G 15/08 E (72) Inventor Ryo Sugada 1-2-1 Shibaura, Minato-ku, Tokyo In Ocy Co., Ltd. (72) Inventor Nozomi Sakaguchi 1-2-1, Shibaura, Minato-ku, Tokyo In-Sea Co., Ltd. (72) Inventor Yoshihiro Matsueda 1-2-1, Shibaura, Minato-ku, Tokyo F Term (reference) 2H001 FF07 HH01 2H038 CA36 CA52 CA67 5G369 AA13 BA02 CB04 EA01 5G375 AA14 AA18 CD03 EA08 EA17

Claims (2)

[Claims] 1. A plurality of armoring wires arranged around a cable core, each armoring wire having a main body portion and a terminal portion radially extending from the main body portion, A device for retaining, including a retaining member provided with a groove through which the terminal portion of each of the exterior wires is in contact, wherein the bottom surface of the groove is located at least on the main body portion side. A terminal portion retaining device for an armored wire in an armored cable, characterized in that the terminal portion of the armored cable is curved in a convex shape outward in the radial direction at a portion in contact with the terminal portion. 2. A plurality of armoring wires arranged around a cable core, each armoring wire having a main body portion and a terminal portion radially extending from the main body portion, A device for retaining, which includes a retaining member having a bottom surface with which the terminal portion of each of the exterior wires is in contact and provided with a groove that penetrates the terminal portion, wherein the bottom surface of the groove is located on the main body portion side. The cable core of the first inclined surface has at least two inclined surfaces, a first inclined surface and a second inclined surface located farther from the main body than the first inclined surface. Is formed so as to be larger than the angle of the second inclined surface with respect to the axis of the cable core.