JPH08289451A - Wire branch connector - Google Patents

Abstract

PURPOSE: To facilitate the wiring work by simplifying the joint between an overhead main cable and a lead-in cable to a customer being branched. CONSTITUTION: When the connector is used, a branch joint box 30 is prepared previously for a main cable. The joint box 30 is provided with a receiving side terminal 33 to be connected with a lead-in cable 4. In the case of a four wire lead-in cable 4, the connector 10 is provided with four terminal blocks 13A, 13B. Three terminal blocks are inserted with fuses 23, for example, and the remaining terminal block is inserted with a short circuit conductor 24. Simultaneous connection of the lead-in cable 4 through fuses is completed immediately upon fitting the connector 10 to the joint box 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire branch connector used for connection between a lead-in cable branched from an overhead distribution line to supply power to a customer and a main cable constituting the overhead distribution line. .

[0002]

2. Description of the Related Art In a low voltage overhead power distribution system, for example, a 6600V class distribution line is laid using a utility pole, and a transformer is used on the utility pole to connect to a 200V class low voltage mains cable. This low-voltage trunk cable is laid near each customer, and this is further branched using a lead-in cable to supply power. FIG. 2 shows a perspective view of a connecting portion between such a low-voltage trunk cable and a lead-in cable. As shown in the figure, the main cable 1 is laid by being supported by an electric pole 3 using an insulator 2. And the main cable 1 at the part of this telephone pole 3
The lead-in cable 4 is connected to the terminal so that the lead-in cable can be led to the customer.

Such a branch portion is constructed as follows. FIG. 3 is a side view of a branch connection portion of the trunk cable and the drop cable. As shown in the figure, the coating of the main cable 1 is partially peeled off to expose the conductor 1A. The lead-in cable 4 also exposes the conductor 4A. This portion is sandwiched by connecting fittings 6 made of two metal plates, and a nut 7 is used for tightening connection. When a fuse is inserted in the lead-in cable 4, for example, in FIG.
As shown in FIG. 1, the lead-in cable 4 is connected in series with the fuse 8 in a cylindrical case.

[0004]

The conventional electric wire branch connection connector as described above has the following problems to be solved. First, the branch cable is, for example, 3 phase 4
In the case of wire type power distribution, four wires are bundled, and in the case of single phase three wire type power distribution, three wires are bundled and drawn. Of course, each of the drop cables is electrically connected to the main cable 1 shown in FIG. 2 by the structure shown in FIG.

These connection operations are relatively complicated, starting with the coating removal operation, fixing the connection fittings, and the subsequent waterproofing operation. However, this kind of work is a work at a high place, and it is preferable to finish it in a short time as easily as possible. Moreover, since many cables are crossed on the telephone pole 3, there is a difficulty in aesthetic appearance of the city. Furthermore, when the incoming cable becomes long or when the strength of the incoming cable becomes a problem, a work of separately installing a support line between the utility pole and the structure of the customer, and laying the incoming cable 4 along it Accompany. This kind of construction is complicated, and there are many parts that are aesthetically problematic as a whole.

The present invention has been made by paying attention to the above points, and simplifies a connecting portion between an aerial laid main cable and a lead-in cable for branching the main cable to distribute power to consumers, It is an object of the present invention to provide a wire branch connection connector that facilitates construction.

[0007]

The electric wire branch connection connector of the present invention electrically connects a lead-in cable to a distribution main cable for power distribution via a connection box suspended in the middle of the main cable. In the connector, the lead-in cable has a plurality of conductors for collective lead-in, and the connector has a plurality of terminal blocks for electrically connecting the plurality of conductors to predetermined terminals inside the connection box. And a fuse inserted in series in any one of the terminal blocks, and a short-circuit conductor inserted in place of the fuse in the remaining terminal block to maintain the electrical continuity of the terminal block. It is a feature.

[0008]

To use this connector, a junction box for branch connection is prepared in advance for the trunk cable. In this connection box, the receiving side terminal for connecting the drop cable is prepared. When the drop-in cable has, for example, a four-wire structure, the connector is provided with four terminal blocks. For example, fuses are inserted in three of the terminal blocks. A short-circuit conductor is inserted in the remaining one terminal block used for grounding or the like. As a result, by mounting the connector in the connection box, the lead-in cable is immediately connected together with the fuse.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of an electric wire branch connection connector of the present invention, in which (a) is a longitudinal sectional view of the connector, and (b) is a sectional view.
Is an end view, and (c) is a sectional view of a main part of the junction box. As shown in the figure, the coating is removed at the end portion of the lead-in cable 4, the insulator 11 is peeled off, and the conductor 12 is exposed. The lead-in cable 4 has a four-conductor structure. As shown in the figure, a rear end side terminal block 13A is compression-connected to each conductor 12. The rear end side terminal block 13A and the front end side terminal block 13B are electrically connected to each other and electrically connected to a conductor of a trunk cable (not shown).

The connector 10 is surrounded by a main protective metal member 15, and a tip portion thereof is surrounded by an intermediate protective metal member 17 connected to the main protective metal member through an intermediate connecting ring 16. Further, an inner cylinder 19 is screwed in the tip end direction of the intermediate protective fitting 17, and a main connecting ring 18 is attached to the outer side thereof. Inside the main protection fitting 15, four rear end side terminal blocks 13A are provided with a rear end side spacer 22 interposed therebetween.
Are placed exactly on the concentric circles. The main protective fitting 15 is made of a tube made of brass, aluminum alloy or the like, and the rear end side spacer 22 is made of an insulator block made of rubber or the like. The rear end side terminal block 13A is inserted into four through holes of the rear end side spacer 22 whose axes are oriented in the connector longitudinal direction.

Further, the tip side terminal block 13B is supported inside the inner cylinder 19 screwed into the inside of the intermediate protection fitting 17 via the tip side spacer 21. The tip side spacer 21 is also made of a block such as rubber. As shown in (b), the tip-side terminal block 13B is concentrically arranged and fitted to the tip-side spacer 21.
Such an electric wire branch connection connector 10 is connected to a connection box 30 suspended from a trunk cable (not shown).

Now, the structures of the main cable and the junction box will be described. FIG. 5 shows an external perspective view of the main cable and the connection box. As shown in the figure, the main cable 1 is bound and laid on a messenger wire 41 using a lashing wire 42, for example. The connection box 30 is suspended from the messenger wire 41 by using a suspension fitting 35. The trunk cable 1 is connected to the connection box 30 via the connector 36.

Further, the lead-in cable 4 is connected to the connection box 30 via the electric wire branch connection connector 10 described with reference to FIG. 1, and is supported by the messenger wire 43 and drawn into the consumer. In addition, the messenger wire 43
Is bound by a metal fitting 45 so as not to be separated from the lead-in cable 4, and the end portion of the messenger wire 43 is fixed to the messenger wire 41 by a metal fitting 44 and is suspended.

As shown in FIG. 1C, a receiving fitting 31 for the main cable is provided inside the connection box 30.
The receiving side terminal 33 is supported therein via the insulating spacer 32. The receiving terminal 33 is electrically connected to each conductor of a trunk cable (not shown) inside the connection box 30. The receiving side terminal 33 has an electric wire branch connection connector 10
The front end side terminal block 13B is inserted and is electrically connected to each other favorably.

FIG. 6 is an exploded perspective view for explaining the structure of each part of the electric wire branch connection connector 10.
As shown in this figure, the main protective fitting 15 has a flange 15A.
And the intermediate connecting ring 16 is fitted therein. A screw 17A is cut on the outer peripheral surface of the intermediate protection fitting 17 on the rear end side, and the screw 17A meshes with the screw 16A cut on the inner surface of the intermediate connecting ring 16 to be connected. Further, a screw 17B is cut on the inner surface of the intermediate protection metal fitting 17 on the front end side, and meshes with a screw 19A cut on the outer peripheral surface of the inner cylinder 19 on the rear end side to integrate them. A flange 1 is provided in the middle portion of the inner cylinder 19.
9B is provided. The main connection ring 18 is fitted in here.

An exploded perspective view of the terminal block is shown in the lower part of the figure, and the pin 23A of the fuse 23 is inserted into the contact hole 13C provided in the tip side terminal block 13B. This contact hole 13C is a pin 23A.
A well-known contact plate in the form of a leaf spring is provided inside in order to insert and remove the plug and to make a good electrical connection between them. Inside the fuse 23, a fuse body 23B inserted between the pins 23A is housed. A contact hole 13D is provided on the front end side of the rear end side terminal block 13A and has a structure for receiving the pin 23A of the fuse 23. A compression connection hole 13E is provided on the rear end side of the rear end side terminal block 13A so that the conductor 12 of the cable is received and compression connected.

The fuse 23 is inserted into only three of the four conductors, and the remaining one, that is, for the conductor used for grounding, has a short-circuit conductor 24 as shown in the figure. Is inserted. The short-circuit conductor 24 has pins 24A exposed at both ends and is connected to the front end side terminal block 13B and the rear end side terminal block 13A in the same manner as the fuse 23. Insulating cover 24B for insulation in the middle part
Is coated.

The electric wire branch connection connector of the present invention described above electrically connects the lead-in cable 4 to the connection box 30 as shown in FIG. In this case, the main connecting ring 18 shown in FIG.
The connector 10 is connected to the receiving fitting 31 by screwing into 1. At this time, the tip side terminal block 13B is inserted into the receiving side terminal 33 and electrically connected. In this way, the four conductors of the trunk cable and the four conductors of the lead-in cable 4 are electrically connected together.

One of the grounding conductors is electrically connected by inserting the short-circuit conductor 24 between the front end side terminal block 13B and the rear end side terminal block 13A. Further, the remaining conductors are electrically connected by inserting the fuse 23. Here, for example, when the fuse 23 is blown due to some accident, the intermediate connecting ring 16 is loosened to disconnect the main protective metal member 15 and the intermediate protective metal member 17, and the connector 10 is divided into two in the longitudinal direction. Take it out. After the fuse is replaced, the intermediate connection ring 16 may be tightened again to connect the main protective fitting 15 and the intermediate protective fitting 17.

When connecting the lead-in cable and the connection box 30, since the connector 10 is assembled in advance in the sectional structure shown in FIG. 1, electrical connection can be made with one touch at the site.

The present invention is not limited to the above embodiments. When the lead-in cable 4 has a three-conductor structure, the number of terminal blocks may be reduced as necessary, and the number of terminal blocks into which fuses are inserted and the number of terminal blocks into which short-circuit conductors are inserted are arbitrary. Good. The spacers 21 and 22
In order to avoid mistakenly inserting the terminal block into which the short-circuit conductor 24 is inserted, a hole having substantially the same thickness as the short-circuit conductor 24 is provided in advance. Since the fuses 23 are inserted into the other holes, the diameters are relatively large, so that the other holes can be easily distinguished and the connection can be prevented from being mistaken.

[0022]

The electric wire branch connection connector of the present invention described above is different from the overhead distribution main line cable for electric power distribution.
It is configured to electrically connect the lead-in cable via a connection box suspended in the middle, and the lead-in cable has multiple conductors for batch pull-in, and this connector allows batch connection, so connection work is extremely easy. Become. Moreover,
The connection box and the connector make it possible to make a connection that does not impair the aesthetic appearance of the city. In addition, the connector is provided with a plurality of terminal blocks for electrically connecting a plurality of conductors collectively, and a fuse can be inserted in series in this terminal block,
Since the short-circuit conductor is inserted in series instead of the fuse, the connector can be easily maintained for maintenance such as fuse replacement.

[Brief description of drawings]

FIG. 1 shows an embodiment of an electric wire branch connection connector of the present invention,
(A) is the longitudinal cross-sectional view, (b) is the end view, (c) is a principal part sectional view of a junction box.

FIG. 2 is a perspective view showing a connection portion between a conventional trunk cable for distribution and a lead-in cable.

FIG. 3 is a main part front view showing a connection portion between a conventional trunk cable and a lead-in cable.

FIG. 4 is a front view of a main portion showing another connection portion between a conventional trunk cable and a drop cable.

FIG. 5 is a perspective view showing a connection portion of a trunk cable of the present invention, its connection box, and a lead-in cable.

FIG. 6 is an exploded perspective view of the electric wire branch connection connector of the present invention.

[Explanation of symbols]

 4 lead-in cable 10 electric wire branch connector 12 conductor 13A rear end side terminal block 13B front end side terminal block 23 fuse 24 short-circuit conductor 30 junction box

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hajime Saito 1 Higashishinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. Showa Cable Denki Co., Ltd. (72) Inventor Hiroshi Kobayashi 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Showa Cable Denki Co., Ltd.

Claims (2)

[Claims] 1. A connector for electrically connecting a lead-in cable to a distribution main cable for distribution of electricity via a connection box suspended in the middle of the main-line cable, wherein the lead-in cable is a collective lead-in cable. And a plurality of terminal blocks for electrically connecting the plurality of conductors to predetermined terminals inside the connection box, and the connector is inserted in series into any one of the terminal blocks. And a short-circuit conductor that is inserted into the remaining terminal block instead of the fuse and maintains the electrical continuity of the terminal block. 2. The terminal block is housed inside a protective fitting which can be divided into a front end side and a rear end side at a fuse insertion portion, and the protective fitting is separably connected by an intermediate connecting ring. The electric wire branch connection connector according to claim 1.