JPH09275627A - Cable connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a connecting part and to easily assemble it for the improvement of operation efficiency. SOLUTION: An internal electrode 23 is provided inside an insulation reinforcing member and the connecting hole is provided with a connecting terminal 31 which electrically connects the conductor 4 of a cable 1 with the internal electrode 23. A projection extruding and retreating mechanism 30 is used to fix the connecting terminal 31 onto the internal electrode 23. The connecting terminal 31 and an adapter 32 can be inserted into the internal electrode 23 lightly and easily with a slip-on system. Once the connection is completed, the projection extruding and retreating mechanism 30 prevents the detachment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connecting portion used for connecting conductors such as a straight connecting portion or a branch connecting portion of a cable.

[0002]

2. Description of the Related Art A structure for electrically and mechanically protecting a conductor connecting portion is adopted in a straight connecting portion or a branch connecting portion of a high voltage cable. FIG. 2 shows a vertical cross-sectional view of a conventional general cable connecting portion. (A) of the figure is a vertical cross-sectional view of the main part of the connecting portion, and (b) and (c) are schematic cross-sectional views during assembly. In the figure, a pair of cables 1 arranged on the left and right have a jacket 2 and an insulator 3 peeled off in order to expose a conductor 4, and the conductor 4 is compression-connected to each other by a connection terminal 5. The insulating reinforcing member 6 is formed by molding an insulator, an epoxy resin, or the like, and is surrounded and protected by the connection box 7. Further, a stress cone 11 is fitted into the insulator 3 of the cable 1 and is pressed against the inner wall surface of the insulating reinforcing member 6 with a predetermined pressure by using a pressing metal fitting 12 and a spring unit 13. The assembly is performed as follows.

First, as shown in (b), the cable jacket 2 and the insulator 3 are peeled off. At this time, the cable 2 on the right side has the jacket 2 removed for a sufficiently long time. Next, as shown in (c), the junction box is preliminarily divided into three parts 7
It is divided into A, 7B, and 7C and attached to both cables together with the stress cone 11. Further, the conductor 4 is connected by compressing the connection terminal 5 in a state where the insulation reinforcement body 6 is covered on the right cable 1 in advance. Therefore, at this time, the stress cone 11 on the right side is sufficiently retracted to the right side from the normal position and retracted. Then, after the connection of the conductors 4 is completed, the insulating reinforcing body 6 is slid in the direction of arrow A1, and then the stress cone 11 is also slid in the direction of arrow A2. In this way, after arranging each component at the proper position, the spring unit 13 is tightened and the tape winding portion 9 is formed to complete the connection portion.

[0004]

By the way, the above-mentioned conventional cable connecting portion has the following problems to be solved. When the cable connecting portion as described above is attached to a manhole or the like having a relatively small space, it is preferable that the cable connecting portion be as small as possible. Moreover, it is preferable that the assembling work is easy. However, as mentioned above,
A space for retracting the insulating reinforcement is required for the conductor connection work, and the entire connection part including the size of the connection box becomes large. Moreover, when the stress cone is displaced or returned to the normal position, a strong force is required because the stress cone is strongly fitted on the insulator. This imposes a heavy burden on the worker, and the workability is poor. The present invention has been made in view of the above points, and an object of the present invention is to provide a cable connecting portion that enables downsizing of the entire connecting portion, facilitates assembly work, and improves workability. It is a thing.

[0005]

The present invention employs the following structure to solve the above problems. <Structure> An insulating reinforcing body for accommodating the conductor connecting portion of the cable and an internal electrode electrically connected to the conductors of the cable inserted through the plurality of openings of the insulating reinforcing body inside the insulating reinforcing body are provided. The electrode is provided with a connection hole connected to the opening of the insulation reinforcement, and the connection terminal accommodated in the connection hole of the internal electrode is fixed to the conductor tip of the cable inserted from the opening of the insulation reinforcement. The connecting terminal is provided with a protrusion retracting mechanism that protrudes a protrusion toward the wall surface of the connection hole to prevent the connection terminal from coming off when the connection terminal is housed in a fixed position. Cable connection to do.

<Description> An internal electrode is provided inside the insulating reinforcing member, and a connection terminal for making an electrical connection between the conductor of the cable and the internal electrode is accommodated in the connection hole. To fix the connection terminal to the internal electrode, a protruding ball, an inner pipe for positioning the protruding ball, an outer pipe, or the like is used. The connection terminal and the adapter can be lightly and easily inserted into the internal electrode in a slip-on manner, and after the connection is completed, the projecting balls or the like prevent the connection terminal from coming off, and the connection portion can be easily completed in a small size. In the present invention, this adapter is called a protrusion retracting mechanism. It should be noted that this connecting portion is provided with two openings in the case of a straight line connection, and is provided with three openings in the case of a Y branch.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to specific examples. <Specific Example> FIG. 1 is a longitudinal sectional view of a main portion showing a specific example of the cable connecting portion of the present invention. In the figure, the cable 1 is
The jacket 2 and the insulator 3 are peeled off to expose the conductor 4 at the end. A connection terminal 31 and an adapter 32, which will be described later with reference to FIG. 3, are attached to the conductor 4, and the connection terminal 23 and the adapter 32 are connected to the connection hole 23A of the internal electrode 23 arranged inside the insulating reinforcement body 20.
Has been inserted. Protective metal fittings 25 are fixed to both ends of the insulating reinforcing body 20 to waterproofly protect the terminal portion of the cable 1 together with the tape winding portion 9. Further, the spring unit 13 and the push fitting 1 arranged on the inner peripheral surface of the protection fitting 25
2, stress cone 1 fitted into insulator 3
1 is configured to be pressed against the inner wall surface of the insulating reinforcing body 20 with an appropriate pressure.

In the cable connecting portion of the present invention having the structure shown in this figure, a pair of left and right cables are inserted from the tips, and electrical connection is completed by slip-on type connection. Therefore, the end can be assembled by a relatively simple connecting operation. In the case of such a configuration, it is preferable that the pulling-out force of the cable is supported by the conductor 4. Therefore, in the present invention,
The terminal structure as shown in FIG. 3 is adopted.

FIG. 3 shows a detailed sectional view of the terminal structure. In the illustrated cable 1, the conductor 4 is exposed for a predetermined length from the end of the insulator 3, and the connection terminal 31 is compression-connected thereto. A spring-shaped contactor 33 is disposed on the outer peripheral surface of the upper portion of the connection terminal 31 to reduce the electrical contact resistance during slip-on connection or the like. The connection terminal 31 is covered with an adapter 32 that fits just outside the connection terminal 31. That is, the connection terminal 31 is fitted in the through hole provided in the shaft portion of the adapter 32, the tip of the connection terminal 31 slightly protrudes from the adapter 32, and the C-shaped stop ring 35 is fitted so that the two do not come off. This has the same structure as a C ring which is well known as a mechanical part.

The adapter 32 is composed of a tubular conductor having an upper portion which is thick in the radial direction and a lower portion which is thin, and has a female screw portion 32A formed on the inner surface of the lower end. On the other hand, this adapter 3
At the lower part of 2, there is provided a projection retracting mechanism composed of an outer pipe 36, an inner pipe 37, a spring 38, a projecting ball 39 and the like. A male screw portion 36A is formed on the outer periphery of the upper end of the outer pipe 36, and the female screw portion 32A of the adapter 32 is just formed.
Both are connected by being screwed into. A step portion 36B is formed on the inner peripheral surface of the upper portion of the outer pipe 36.

The spring 3 is provided between the step portion 36B and the step portion 37B provided at the central portion of the inner pipe 37.
8, the spring 38 pushes the outer pipe 36 upward and the inner pipe 37 downward. The outer pipe 36 is provided with several ball storage holes 36C in the lower part thereof. A projecting ball 39 is housed in the ball housing hole 36C. The projecting ball 39 is made of a steel ball or the like, and the outer diameter is selected so that a part of the projecting ball 39 projects outward from the ball storage hole 36C. Further, on the outer peripheral surface of the inner pipe 37, as will be described later, a receiving groove 37C for receiving a part of the projecting ball 39 is provided.

Further, the projecting ball 39 is provided with a ball storage hole 36.
When protruding outward from C, the internal electrode 23 is provided with a positioning groove 23B so as to receive the protruding portion. That is, in the state as shown in this figure, the projecting ball 39 projects a part thereof from the ball storage hole 36C of the outer pipe 36 to the outside and projects a part thereof into the positioning groove 23B, and the adapter 32 is the internal electrode. It is prevented from sliding up and down with respect to the inner wall surface of the connection hole 23. That is, the connection terminal 31 is prevented from coming off.

The tip of the stress cone 11 fitted on the outer peripheral surface of the cable 1, that is, the upper end, is pushed by the spring unit 13 shown in FIG.
The stopper 17 is pushed upward so that the flange portion 37D of the inner pipe 37 is pressed against the lower end surface of the internal electrode 23. The position of the inner pipe 37 is determined by this force as shown in the figure. In this state, the ball storage hole 3 of the outer pipe 36
The projecting ball 39 housed in 6C is pushed outward by the outer wall surface of the inner pipe 37, and a part of the projecting ball 39 projects into the positioning groove 23B.

FIG. 4 shows the state of the cable terminal before the connection terminal is housed and positioned at the fixed position of the connection hole as described above. Before the completion of the cable connection part assembly, there is a gap between the stress cone 11 and the insulating reinforcement 20, and the inner pipe 37 is still below the fixed position. When forming such a terminal, first, the connection terminal 31 is compressed and connected to the conductor 4 of the cable, and then the inner pipe 37 is formed.
Is fitted, a spring 38 is fitted on the outer side thereof, and the outer pipe 36 is further covered on the outer side thereof. Next, spring 3
While compressing 8, the upper end of the inner pipe 37 is projected onto the outer pipe 36. And to prevent both from coming off,
The stopper ring 41 is fixed to the upper end of the inner pipe 37.

At this time, the protruding balls 39 are formed on the outer pipe 36.
The ball storage hole 36C and the receiving groove 37C of the inner pipe 37 are stored. Therefore, the entire protruding ball 39 is the outer pipe 3
6 is located inside the outer peripheral surface and is not projected to the outside. Here, finally, the adapter 32 is screwed into the outer pipe 36, and the tip of the connection terminal 31 is projected from the adapter 32.
When the C-shaped stop ring 35 is fitted, the assembly of the terminal portion is completed. Then, the adapter 32 is inserted into the connection hole of the internal electrode 23 in the state as shown in FIG. In this case,
Since the projecting ball 39 does not project to the outside, the adapter 32 is completely housed in the connection hole of the internal electrode 23 as shown in the figure.

In this state, the projecting ball 39 is arranged so as to face the positioning groove 23B. Here, when the stress cone 11 shown in FIG. 3 is pushed using the spring unit 13 shown in FIG. 1 or the like, the flange portion 37D of the inner pipe 37 is pushed upward via the stopper 17. As a result, the projecting ball 39 is pushed out of the receiving groove 37C and is pushed by the outer wall surface of the inner pipe 37, and the positioning groove 23 is pushed.
Part of it is projected to the B side. In this way, the protruding balls 39 position the adapter 32 and the like in the state as shown in FIG. 3, whereby the mechanical connection between the conductor 4 and the internal electrode 23 is achieved.

The cable connecting portion of the present invention having the above structure is
As described with reference to FIG. 1, the connection is performed by a simple connection work such as a slip-on type. Then, the protrusion / retraction mechanism including the protrusion ball 39 and the like configured by the adapter prevents the connection terminal from coming off, and a reliable connection portion having high mechanical strength is formed. Moreover, since it is not necessary to retract the insulating reinforcement, it is possible to further reduce the size.

The present invention is not limited to the above embodiments. The projection retracting mechanism itself may have a structure in which a pin or the like is projected in addition to the structure in which the ball is projected as described above.

[0019]

In the cable connecting portion of the present invention described above, the connection terminal accommodated in the connection hole of the internal electrode is fixed to the tip of the conductor of the cable inserted through the opening of the insulation reinforcement, and the connection terminal is When the connection hole is stored in a fixed position, the protrusion is projected toward the side wall surface to prevent the connection terminal from coming off.Therefore, the cable can be inserted and removed with a light force to facilitate workability. In addition, the mechanical strength that prevents the cable from being pulled out once connected can be increased. Further, it is possible to reduce the size as a whole.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a cable connecting part of the present invention.

FIG. 2 is a vertical sectional view of a conventional cable connecting portion.

FIG. 3 is a vertical cross-sectional view showing a conductor connecting portion of a cable connecting portion of the present invention.

FIG. 4 is a vertical cross-sectional view illustrating the assembling procedure of the cable connecting portion of the present invention.

[Explanation of symbols]

 1 Cable 3 Insulator 4 Conductor 11 Stress Cone 17 Stopper 23 Internal Electrode 23B Positioning Groove 31 Connection Terminal 32 Adapter 33, 34 Contact 36 External Pipe 37 Inner Pipe 37D Flange 39 Projecting Ball

Claims (1)

[Claims] 1. An insulating reinforcing body for accommodating a conductor connecting portion of a cable, and an internal electrode electrically connected to a conductor of a cable inserted through a plurality of openings of the insulating reinforcing body inside the insulating reinforcing body, The internal electrode is provided with a connection hole that is continuous with the opening of the insulation reinforcement, and the conductor tip of the cable inserted from the opening of the insulation reinforcement has a connection terminal accommodated in the connection hole of the internal electrode. The connection terminal is fixed and is provided with a protrusion retracting mechanism that protrudes the protrusion toward the wall surface of the connection hole to prevent the connection terminal from coming off when the connection terminal is housed in the fixed position of the connection hole. Characteristic cable connection part.