JPH07264761A - Cable pulling end - Google Patents

Abstract

PURPOSE:To protect a cable by accommodating with play a root area in the single side of a joint as a retainer of large diameter to be retained within a joint housing into an accommodation part of the joint housing. CONSTITUTION:Since a retaining part of a joint, for example, a ball joint 32 is accommodated with play into an accommodation part of a joint housing, a pulling direction of a cable 10 can be changed depending on change of the direction in the pulling force. When the pulling force is applied to a pulling bolt 16 through a smooth ball joint 32, the end part of the pulling terminal can be moved freely. Moreover, the end part of the pulling terminal can also be moved freely in such a case that a pin 38 is coupled at a right angle with the axial direction of the pulling bolt 16 and the pulling force is applied to the pulling bolt 15 through the pin 38. Therefore, a bending conduit in a large radius of curvature can also be run smoothly. Thereby since an excessive force is not applied to the end part of the cable 10, it can be protected from damage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction terminal for an optical fiber cable and a metal conductor cable.

[0002]

2. Description of the Related Art FIG. 2 shows an example of an optical fiber cable. (A) is an external view and (b) is a partial cross-section (during assembly). The tension member 12 of the cable 10 is exposed and passed through the hole of the traction bolt 16, and the whole traction bolt 16 is compressed and deformed and fixed. Further, a metal cap 18 is put on the cable sheath 14, and the metal sheath 18 is compressed and deformed to be fixed to the cable 10. The eye nut 20 is screwed into the tip of the tow bolt 16, and the rope 22 is pulled over this and pulled. Reference numeral 17 is a rubber ring, 19 is a cap, and 21 is a nut.

In the case of a metal conductor cable, the metal conductor replaces the tension member 12. Therefore, the term "tension member" in the present specification includes both the tension member itself in the case of an optical fiber cable and the cable conductor in the case of a metal conductor cable.

[0004]

The cable pulling terminal having the above structure is firmly fixed by the pulling bolt 16, the metal cap 18 and the eye nut 20, and the portion of the length L shown in FIG. 2 is completely bent. There is no such thing.
Therefore, the following problems occur. (1) Although there is no problem when passing through an ordinary non-bent pipe line, in the pipe line 24 which is bent with a large curvature (a sharp curve) as shown in FIG. 3, even if the cable 10 is bent, Since the towing terminal does not bend, it cannot pass. (2) When an aerial cable passes through a railcar on a pole, the towing terminal is often caught. If this happens, excessive force will be applied to the tip of the cable, which may damage the cable.

[0005]

[Means for Solving the Problems]

(1) As shown in FIG. 1A, a traction force is applied through a mooring portion, for example, a ball joint 32 housed in a joint housing at the tip of the traction bolt 16. The other end of the joint is a small eye nut (eye hole). (2) Alternatively, the pin 38 is fitted into the traction bolt 16 at right angles to the axial direction, and traction force is applied to the traction bolt 16 via the pin 38.

[0006]

[Work]

(1) Since the mooring portion of the joint is flexibly accommodated in the accommodating portion of the joint housing, the cable pulling direction can be changed according to the change in the pulling force direction. (2) If a pulling force is applied to the pulling bolt 16 via a smooth ball joint, the tip of the pulling terminal can move smoothly and freely. Further, since the large eye nut 20 is not necessary, the total length of the tow terminal is shortened. Therefore, it becomes easy to pass through a curved pipeline having a large curvature. (3) Also, when a pin is fitted in the traction bolt 16 at a right angle to the axial direction and a traction force is applied to the traction bolt 16 via the pin, the tip of the traction terminal can also freely move. . Further, since the large eye nut 20 is not necessary, the total length of the tow terminal is shortened. Therefore, it becomes easy to pass through a curved pipeline having a large curvature.

[0007]

EXAMPLE 1 In the case of FIG. 1A, an example of an optical fiber cable is shown. The tension member 12 of the cable 10 is exposed and is passed through the hole of the traction bolt 16,
6. The whole 6 is compressed and deformed and fixed. Further, a metal cap 18 is put on the cable sheath 14, and the metal sheath 18 is compressed and deformed to be fixed to the cable 10. Up to this point, it is the same as the conventional case. The coupling method of the joint and the joint housing is a ball coupling method, and the housing portion of the joint housing has a slightly larger spherical cross section according to the spherical shape of the mooring portion. The tow bolt 16 should be as short as possible. Further, the metal cap 18 is also made as short as possible.

A rubber ring 23 for waterproofing is put inside the metal cap 18. A socket 26 having a spherical inside is formed at the tip of the tow bolt 16, and a ball 28 having a rod 30 is fitted therein to form a ball joint 32. Then, the rope 22 is hooked in the eye hole 34 at the tip of the rod 30 and pulled.

The ball joint 32 and the traction bolt 16 may not be integrally formed, but may be formed as separate parts and joined together by screwing or the like. Further, the purpose of the ball joint in the present invention is that the joint axial direction freely changes in accordance with the direction of the traction force, and the direction of the force applied to the cable changes, so as a means for realizing this, It is not necessary to limit to the ball joint of the above-mentioned form. The point is that the root portion on one side of the joint forms a large-diameter mooring portion that stays in the joint housing, and the mooring portion is floating (the direction of the joint changes depending on the direction of the traction force) in the housing portion of the joint housing. ). If the area of the opening provided in the joint housing is larger than that of the shaft connecting the mooring portion and the eye nut, the shaft passes through the opening gently. Further, by making the mooring portion have a larger diameter than the opening, the joint does not catch on the opening and fall out, and the mooring portion is accommodated in the accommodating portion of the joint housing in a floating manner. According to the above-mentioned purpose, for example, it is also possible to adopt a hollow box type storage part, provide an opening partly on a side wall thereof, and adopt an arbitrary shape and area which does not pass through the opening part as the mooring part. .

[0010]

[Embodiment 2] FIG. 1 (b) shows a state as viewed from the side of the cable, and FIG. 1 (c) shows a state as viewed from the right side. Also in this case, the traction bolt 16 should be as short as possible. A slightly thick hole 36 is formed at the tip thereof so as to penetrate in the direction perpendicular to the axial direction. Pass the pin 38 through the hole 36, and
Hang and pull. Other than that, it is the same as the case of the first embodiment.

It is useful to use this towing terminal when passing an object through a narrow pipe other than passing a cable through a pipe.

[0012]

【The invention's effect】

(1) Since the tip of the towing terminal freely moves in all directions, it can pass through a conduit having a large curvature. Also, when passing through the money train, it is not caught. (2) Do not force the tip of the cable, so the cable will not be damaged.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of an example of a conventional tow terminal.

FIG. 3 is an explanatory diagram of a problem to be solved by the present invention.

[Explanation of symbols]

 10 Cable 12 Tension Member 14 Cable Sheath 16 Traction Bolt 17,23 Rubber Ring 18 Metal Cap 20 Eye Nut 22 Rope 24 Pipeline 26 Socket 28 Ball 30 Rod 32 Ball Joint 34 Eye Hole 36 Hole 38 Pin

Claims (3)

[Claims] 1. A pulling terminal of a cable for connecting a pulling bolt to a cable tension member, and applying a pulling force by meeting a joint connected to the bolt, wherein one side of the joint is a mooring portion and the other side is a pulling rope. A cable traction that forms an eye nut for bundling, and a shaft portion that connects the mooring portion and the eye nut gently passes through the opening of the joint housing, and the mooring portion is loosely accommodated in the accommodating portion of the joint housing. Terminal. 2. A pulling terminal for a cable, wherein a pulling bolt is connected to a tension member of the cable, and pulling force is applied to the pulling bolt via a ball joint. 3. A pulling bolt for connecting a tension member of the cable with a pulling bolt for applying pulling force to the bolt, wherein a pin is provided on the pulling bolt at a right angle to the axial direction, and the bolt is connected to the bolt through the pin. A cable traction terminal designed to apply traction.