JPS58115790A - Method of branching, molding and connecting cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cable branch mold connection method.

Main cables used for indoor wiring in high-rise buildings such as pillboxes and condominiums include several insulated wires (usually three).
A twisted single core stranded cable is used.

In such a single-fiber stranded main cable, each branch line for leading to each floor of the building is connected to each main line with a conductor in advance in the factory, the conductor connection part is molded insulated, and the main cable with the branch line is connected to the main line. It is usually transported and extended in the form of

By the way, as a branch mold connection method for a single-core twisted type cable, each core of a single-core twisted type cable in which branch lines are electrically connected is arranged in parallel with each other at a predetermined interval,
A connection method is known in which the periphery of these branch connections is collectively molded with a rubber/plastic insulating material.

However, the above-mentioned connection method requires a troublesome work of separating the single wire cores to make them parallel to each other, and this work is extremely difficult, especially in the case of large-sized cables. In addition, since the above connection part has a structure in which the cores are arranged in parallel, the outer diameter of the connection part is inevitably large, making it difficult to install a single-core twisted type cable with such a connection part vertically in a high-rise building, etc. In this case, there is also the problem that the floor through hole through which the cable is inserted must be made large.

The cable branch mold connection method according to the present invention is a method that can solve the above-mentioned difficulties, and is a method that can solve the above-mentioned difficulties. In the method of placing the trunk in a half-split mold and casting it with rubber or plastic material, the branch connections in each of the trunk lines are spaced apart from each other in the longitudinal direction.
The branch connections are arranged so that they do not come into contact with each other and the main lines are twisted together, and then housed in a half-split mold. A large number of wire insertion holes through which individual wires are inserted are provided in a concentric arrangement, and each of these wire insertion holes is divided into two vertically by dividing lines parallel to the tiles. Each main line and branch line is inserted and supported by each block having a circular cross section, and then a rubber/plastic insulating material is injected into the mold to insulate the branch connection part. shall be.

The present invention will be explained below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the branch mold connection method according to the present invention. In the figure, 1 is a trunk cable made by twisting a large number of trunk wires, and the one shown is three trunk wires. The so-called triplex type cross-linked polyethylene insulated vinyl sheath cable (C
vT key). 3, 3, . . . are branched and connected S through conductor sustaining sleeves 4 at predetermined short intervals of each main line 2, for example, every 3 to 5 m (story height of a building). This is a branch line with an insulating coating, and in the illustration, two branch lines 3, 3 are connected to a sleeve 4 for one main line 2.
It is taken out from the left and right sides. Reference numeral 5 denotes a cylindrical mold having a spindle-shaped cavity 51 and divided into upper and lower halves, and ring-shaped grooves 52 are formed on the inner walls of both ends.

53 and 54 are a resin injection hole and an air vent hole provided in the cylindrical mold 5, respectively. Reference numeral 6 is made of a rubber/plastic insulating material, such as vinyl chloride resin, which insulates the branch connection portion S by molding.

Reference numeral 7 denotes a metal block having a circular cross section that protrudes and is fixed to the inner walls of both ends of the mold 5, and the block 7 is shown in FIG. 2A.
, B and C, the main line 2. ...and branch line 3. . . . through holes 71° . . . and 72 . ... are arranged concentrically with respect to the circular cross section.

In the illustration, the main line holes and the branch line holes are arranged so as to be located on a concentric circle C1 and a concentric circle C2, respectively. In this case, each trunk line insertion hole 71, 7
1.71 and each of the branch wire insertion holes 72, 72, and 72 are desirably provided in a triangular arrangement from the viewpoint of structure and electrical characteristics. 73 is the insertion hole 71.・・・
・,72. It is a dividing surface that divides each of 73. ... are provided so as to be parallel to each other. 74 is a ring-shaped projection provided on the outer periphery of one end of the block 7, and the ring-shaped projection 2 has a shape that fits into the ring-shaped groove 52 in the mold 5 mentioned above. Reference numeral 75 designates a rectangular flange portion formed at the other end of the block 7, and a pin bell hole 76 is provided at both ends thereof in a direction perpendicular to the dividing surface 73, and the block 7 is divided at the dividing line 73. . 9
are the above-mentioned divided pieces 7 a , 7 b , 7 c , 7
d.

This is an auxiliary band that collectively holds 7'e.

Next, to explain the procedure of the branch mold connection method of the present invention, first, the branch connection parts S, S in each main line 2, 2.2,
'S should not be electrically contacted as shown in the first part. In this case, each branch connection S is connected to the trunk cable 1
Arrange them so that they are in a twisted state. Next, the branch connection part S is housed in the mold 5, and each trunk line 2 on both sides of the branch connection part S and each Branch line 3
firmly inserts and supports. Thereafter, the salt-flowered vinyl resin bound 6 is extruded from the resin injection holes SS and IL of the mold 5 using an extruder or a molding machine, thereby obtaining a molding machine-grade processed branch connection part.゛As mentioned above, the branch mode connection 5-2 connection method according to the present invention connects a branch line connection portion of each main line of a main line cable in which a large number of main line electric wires are twisted together.
□ Since the branch connections are shifted in the longitudinal direction so that they do not contact each other, and are placed in a twisted state of the main lines and then partially molded and insulated, the overall shape of the molded branch connection can be further miniaturized. The above-mentioned conventional difficulties can be eliminated. Moreover, since the branch connection parts are offset from each other in the longitudinal direction, electrical contact between the branch connection parts can be completely interrupted, so that a connection part with stable electrical characteristics can be obtained.

Furthermore, in the present invention, a large number of wire insertion holes are provided in a concentric arrangement at both ends of the mold for inserting and supporting main wires and branch wires individually, and each of these wire through holes is divided into upper and lower halves. The structure is divided by parallel dividing lines so that the cross section is circular 7"
: In order to attach and heat the wires to the mold, the wires inserted into the mold are twisted in the specified state, and a block is attached to the end of the cable. Regardless of the rotational phase of the block, since the outer periphery of the block is circular, a reliable fit between the block and the two-split cylindrical mold can be guaranteed, and it is also suitable for twisting trunk cables.
However, there is an advantage that the connection portion can be easily molded. Of course, since the blocks are divided, they can be easily separated after molding.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the cable branch mold connection method according to the present invention, FIG. 2A is a partially cutaway side view of a block with a circular cross section used in the present invention, and FIG. 2B is a diagram showing FIG. 2A. FIG. 2C is a sectional view taken along the Ro-Ro line in FIG. 2A. In the figure, 1 is the trunk cable, 2, 2, is the trunk cable, and 3 is the trunk cable.
, 3 is a branch line, 5 is a two-piece cylindrical mold, 6 is a rubber
Plastic insulating material, 7 is a block with a circular cross section, 71
and 72 are wire insertion holes, 73 is a dividing surface, and S is a branch connection portion. Patent applicant: Dainichi Nippon Electric Cable Co., Ltd. Yukio Aoyama

Claims (1)

[Claims] A method in which a branch connection section in which a branch line is conductor-connected to each main line of a main line cable made of a large number of twisted main line electric wires is housed in a half-split mold and molded with rubber or plastic material. The branch connections in the main line are shifted in the longitudinal direction so that the branch connections do not come into contact with each other, and are arranged so that the main line is in a twisted state, and then housed in a half-split mold. A large number of wire insertion holes are provided in a concentric arrangement at both ends of the mold for individually inserting the main line and branch wires, and each of these wire insertion holes is arranged parallel to each other so as to be divided into upper and lower halves. 1. A method for connecting a cable with a branch mold, which comprises: holding the cable for a certain amount of time, and then injecting rubber or plastic insulating material into the mold to give the branch connection part a 1:1 green treatment.