JP3270240B2 - Cable retention end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining end of a cable, and more particularly, to a retaining end in which a pulling eye is attached to an end of a power cable or the like for prefabrication.

[0002]

2. Description of the Related Art Conventionally, a pulling eye has been attached to an end of an electric power cable or the like in order to be drawn into a laying pipeline.
Forming a detent end has been performed.

FIG. 2 shows the structure of such a retaining end. In the conventional retaining end, the end of the cable conductor 1 is inserted into the cylindrical portion 2b of the pulling eye main body 2 composed of the bolt portion 2a and the large-diameter cylindrical portion 2b, and compressed by being compressed from the outside. I have. In addition, on the outer periphery of such a crimped portion, the protective and anticorrosion layer 4 extends over the cable insulator 3.
Is provided, and a protective tube 5 is fitted on the outside thereof,
The rear end is fixed on the cable via a protective anticorrosion layer 4. Further, a ring-shaped lid 6 and an eye nut 7 are inserted or screwed into the bolt portion 2a of the pulling eye body 2 in order, and the lid 6 is enlarged by screwing the eye nut 7 into the bolt portion 2a. It is pressed against the diameter cylindrical portion 2b, and is fitted and fixed to the opening at the distal end of the protective tube 3.

[0004] In recent years, in order to reduce the work area in the field, a method of prefabricating a cable that has been subjected to terminal end treatment by constructing a cable end portion at a factory has been performed (prefabricated wire drawing method). . In this method, a cable in which terminal parts such as connection terminals are attached to conductor ends is drawn in.

[0005]

However, for such a prefabricated cable, the pulling eye body is directly compression-connected to the connection terminal as in the above-mentioned retaining end, and the cable is extended. No tension could be applied. That is, if the pulling eye body is directly compression-connected to the connection terminal attached to the end of the cable conductor, there is a problem that the current-carrying contact surface of the connection terminal is damaged. .

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a retaining end portion of a cable which can apply a sufficient extension tension to the cable without damaging a connection terminal or the cable. The purpose is to do.

[0007]

Means for Solving the Problems The retaining end of the cable of the present invention is used for drawing into a pipeline by a prefabricated wire drawing method.
At the retaining end of the cable, the rear end of the pooling eye is fitted to the distal end of the connecting terminal that is compression-connected to the conductor end of the cable, and the cylindrical retaining halves are fitted outside the connecting terminal. fitted over the bracket, and the both ends of the anchoring bracket, the outer circumference of the pulling eye and engaged engagement respectively with the rear end portion of the connecting terminal, and integrally connected to the connecting terminal and the pulling eye, further wherein In front of the retaining bracket
Attach a fixed sleeve to the outer circumference of the engaging portion with the pulling eye.
It is characterized by being fitted .

[0008]

[0009]

According to the present invention, a pulling eye is fitted to a tip of a connection terminal crimped to a conductor end of a cable, and a cylindrical catch is fitted on the outside thereof. The pulling eye and the connection terminal are integrally connected by engaging both ends of the retaining metal fitting with the outer periphery of the pooling eye and the rear end of the connection terminal, respectively. The applied tensile force (extended wire tension) acts on the rear end of the connection terminal via the retaining metal, and further acts on the end of the cable conductor to which the connection terminal is compression-connected. Therefore, the wire can be drawn without damaging the energizing contact surface of the connection terminal or the cable.

[0010] In such a pulling eye mounting structure, a centering metal fitting is inserted between the connection terminal and the pulling eye body, and a screw or the like is combined with the centering metal fitting. In this case, the center axis of the connecting terminal is aligned with the center axis of the connection terminal, so that the center axis of the pooling eye is attached to the center axis of the cable. Therefore, since the tension at the time of extension acts in the center axis direction of the cable, no bending force is applied to the cable,
No rattling occurs.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing one embodiment of a retaining end of a cable according to the present invention. In the figure, reference numeral 8
Shows a cable conductor exposed by stepping off the end of the cable, and a copper connection terminal 9 is compression-connected to the end. Also, a centering metal fitting 10 having a screw insertion hole at the center is disposed at a small-diameter portion at the distal end of the connection terminal 9, and a steel hole having a through-hole 11 for drawing at the distal end is further provided outside. The rear end of the pooling eye 12 is fitted. A centering screw 13 is provided at the center of the rear end fitted portion of the pulling eye 12 so as to penetrate in the axial direction. The centering screw 13 is screwed into the center of the distal end face of the connection terminal 9 through the insertion hole of the centering bracket 10, and the center axis of the pooling eye 12 is accurately aligned with the center axis of the connection terminal 9. So that they match. Further, on the outer side of the connection terminal 9, a two-piece retaining metal fitting 14 whose both ends in the axial direction are bent inward is fitted. And
The bent portions at both ends of the retaining metal fitting 14 are the pulling eyes 1
A groove provided in an annular shape on the outer periphery of the rear end of the connecting terminal 9;
Are engaged with the step portions between the rear end surface of the cable conductor 8 and the cable conductor 8, respectively.
2 and the connection terminal 9 are integrally connected. Further, a cylindrical fixing sleeve 15 is fitted around the outer periphery of the distal end portion of such a retaining fitting 14, and the pulling eye 12
Is pressed down from the outside. Further, a metal protective tube 1 is provided outside the connecting portion by the retaining fitting 14.
6 is fitted, and the rear end of the protective tube 16 is fixed on a cable sheath (not shown) by a protective anticorrosion layer (not shown). Further, a ring-shaped lid 17 is fitted into the distal end opening of the protective tube 16, and the lid 17 is fixed by a ring-shaped lock nut 18 screwed around the outer periphery of the pulling eye 12. ing. Reference numeral 19 denotes a cable insulator, and reference numeral 20 denotes an O-ring.

The retaining end of the embodiment having such a structure is as follows.
It is assembled according to the following procedure. That is, after the connection terminal 9 is first compression-connected to the end of the cable conductor 8, the centering metal fitting 10 is fitted to the tip of the connection terminal 9, and the center screw insertion hole coincides with the center of the tip end surface of the connection terminal 9. And cover it. Next, after the connection terminal 9 with the centering metal fitting 10 attached as described above is inserted into the recess at the rear end of the pooling eye 12, a screw hole formed at the center of the rear end of the pooling eye 12 is formed. Then, the centering screw 13 is inserted, and the centering of the connection terminal 9 is screwed through the screw insertion hole of the centering bracket 10 to the center of the distal end surface of the connection terminal 9. And the center axis of the pooling eye 12 is connected to the connection terminal 9.
, That is, the center axis of the cable. Next, the catch 14 is fitted over the outside of the connection terminal 9, and the rear end (inwardly bent portion) is engaged with the rear end of the connection terminal 9. Fit into the groove. Then, thus, the retaining bracket 1
After the protective tube 16 is fitted to the outside of the cable end to which the cable 4 is fixed, the cylindrical fixing sleeve 15 is driven into the distal end opening of the protective tube 16 to fit around the distal end of the retaining fitting 14. Thus, the divided portions of the retaining member 14 are integrally connected, and the protective tube 16 is concentrically restrained with respect to the cable. Next, after fitting the ring-shaped lid 17 from the tip of the pulling eye 12, the ring-shaped lock nut 18 having a threaded portion formed on the inner periphery is further fitted on the outer periphery of the pulling eye 12. Then, the threaded portion of the lock nut 18 is screwed into the threaded portion of the outer periphery of the pulling eye 12, and the lid 17 is pressed and fitted to the opening at the distal end of the protective tube 16. Finally, the lock nut 18 thus screwed is fixed by pushing the lock pin into a predetermined position.

At the cable retaining end of the embodiment assembled as described above, the connection terminal 9 crimped to the end of the cable conductor 8 and the pulling eye 12 attached to the end of the cable terminal 8 are connected to the outside of the terminal. Clasp 1 fitted on
4, the extension tension is applied from the pulling eye 12 to the rear end of the connection terminal 9 via the fastening metal 14, so that the energizing contact surface of the connection terminal 9 Wire can be drawn without damaging the cable or cable.

A centering metal fitting 10 is inserted between the connection terminal 9 and the pulling eye 12 such that its screw insertion hole is aligned with the center of the distal end face of the connection terminal 9. And the centering screw 13 is
Is inserted through the center screw hole of the centering metal fitting 10 in order and screwed into the center of the distal end surface of the connection terminal 9, so that the center axis of the pooling eye 12 is the center axis of the connection terminal 9, It matches the central axis of the cable. Therefore, since the tension at the time of extending the wire acts in the direction of the central axis of the cable, no bending force is applied to the cable and no rattling occurs.

Further, since the pooling eye 12 is not in direct contact with the cable conductor 8 and is not compressed, the pooling eye 12 can be made of an inexpensive metal material such as iron other than copper. Further, since the pulling eyes 12 can be used repeatedly as many times as possible after the cable pull-in and laying, it is economically advantageous.

[0016]

As described above, according to the retaining end of the cable of the present invention, the terminal processing of the cable end is performed,
The wire can be drawn with the connection terminal attached to the conductor end, which is suitable for the prefabricated wire drawing method.

Further, since the pulling eye and the connection terminal are connected to each other via the catch fitting fitted and engaged with the outside of the pulling eye, the current-carrying contact surface of the connection terminal and the cable may be damaged by extension tension. I will not receive it.

Further, since the pulling eye is attached so that the central axis thereof coincides with the central axis of the cable, and the extension tension is always applied in the direction of the central axis of the cable, the pulling eye is pulled when the extension is pulled in. No bending force is applied to the wire, and no rattling occurs.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a retaining end of a cable of the present invention.

FIG. 2 is a longitudinal sectional view showing the structure of a conventional cable retaining end.

[Explanation of symbols]

 8 Cable conductor 9 Connection terminal 10 Centering bracket 12 Pulling eye 13 Centering screw 14 Fastening bracket 15 Fixed sleeve 16 … Protective tube 18… Lock nut

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 15/02

Claims (1)

(57) [Claims] (1) A prefabricated wire drawing method is used to draw a pipe into a pipeline.
In anchoring end portion of the fit of the cable, as well as fitted on the rear end portion of the pulling eye at the tip portion of the compression joint connection terminal to a conductor end of the cable, the split in the cylindrical outside of the connection terminals argument A clasp is fitted, and both ends of the clasp are engaged with an outer periphery of the pooling eye and a rear end of the connection terminal, respectively, to integrally connect the pooling eye and the connection terminal , Of the retaining bracket
A fixing sleeve is provided on the outer periphery of the engagement portion with the pooling eye.
A retaining end portion of the cable, wherein the retaining end portion is fitted .