JP2005354758A - Branch cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a sufficient insulation property at a connection section of a trunk line and a branch line, improve construction, eliminate a large facility such as an injection molding machine in manufacture, improve a productivity, and reduce a cost. <P>SOLUTION: A cover member 15 is closely attached to an outer face of a branch section 14 before a cable is installed, and deformed by compressing it in the longitudinal direction of the trunk line 11 so as to expand an outside diameter after the cable is installed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a branch cable used for low-voltage wiring in buildings, apartment houses, factories, tunnels and the like, and relates to a structure for improving workability and productivity and reducing costs.

  For example, conventional branch cables having a branch structure as shown in Patent Documents 1 and 2 are known.

  6 and 7, the branch cable 20 includes a trunk line 21, a branch line 23 electrically connected to the trunk line 21 via a connector 22, and an end of the trunk line 21 (the upper end in FIG. 6). And a lifting bracket 24 fixed to the portion.

The electrical connection of the branch line 23 to the trunk line 21 is performed as follows. That is, after the covering 21 a of the main line 21 to which the branch line 23 is connected and the covering 23 a of the branch line 23 are peeled off, the conductor 23 b of the branch line 23 is connected to the conductor 21 b of the main line 21 via the connector 22. . A connecting portion 25 (hereinafter referred to as a branch portion 25) between the trunk line 21 and the branch line 23 is covered with a molded portion 26 made of a vinyl chloride resin or the like and is electrically insulated. The lifting bracket 24 is for lifting the cable for extending the cable when laying the cable.
Japanese Patent Laid-Open No. 11-308725 JP 2001-143536 A

  In the conventional branch cable 20 described above, the connecting process of the trunk line 21 and the branch line 23 is performed in advance at the factory, not at the cable construction site, so that labor saving and shortening of the construction period are possible, and stable high quality is achieved. There is an advantage that it can be obtained.

  However, there is a problem that the outer diameter of the branch portion 25 is large, and it is difficult to insert the cable into a through hole (not shown) such as a building when laying the cable, and the workability is low. In addition, in order to improve the workability, when trying to reduce the outer diameter of the branching portion 25, there is a problem that the molded portion 26 becomes thin, the insulation performance is lowered and the required electrical characteristics cannot be satisfied. there were. Furthermore, in order to form the molding part 26, a large facility such as an injection molding machine is required as a cable manufacturing facility, which causes a problem of reducing productivity and increasing costs.

  The present invention has been made in view of the above circumstances, and while ensuring sufficient insulation performance of the connecting portion of the main line and the branch line, it is possible to improve the workability, and to produce an injection molding machine. An object of the present invention is to provide a branch cable that can improve productivity and reduce costs without requiring a large facility.

  1) A branch cable according to the present invention is formed into a tubular shape with a trunk line, a branch line electrically connected to the trunk line via a connector, and a material having required electrical insulation and elasticity, And a cover member that covers the connection portion by being closely attached to the connection portion of the branch line, and the cover member is compressed by being compressed along the longitudinal direction of the trunk line after laying the cable. It is deformed so as to increase its diameter, and a predetermined insulating distance is secured in the radial direction between the connecting portions.

  2) The branch cable according to the present invention is the branch cable according to 1) above, wherein the cover member is deformed so as to expand its outer diameter after laying the cable, and both end portions in the longitudinal direction are locked members. It is preferable to be fixed to the main line by

  According to the branch cable of the present invention, it is possible to ensure sufficient insulation performance at the connecting portion between the main line and the branch line. Moreover, workability can be improved, large equipment such as an injection molding machine can be made unnecessary for production, and productivity can be improved and costs can be reduced.

  Moreover, the insulation distance of the connection part of a trunk line and a branch line, and a cover member can be hold | maintained reliably, and sufficient insulation performance of a connection part can be ensured more reliably.

  Hereinafter, the present invention will be described with reference to illustrated embodiments.

  FIG. 1 is a schematic side view of an essential part showing a state before construction of a branch cable according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of FIG. 1, and FIG. The principal part schematic side view which shows the state after construction, FIG. 4 is a schematic sectional drawing of FIG. FIG. 5 is a schematic cross-sectional view of the main part showing the deformation of the cover member before and after the branch cable shown in FIG.

  1 to 5, the branch cable 10 includes a trunk line 11, a branch line 13 that is electrically connected to the trunk line 11 via a connector 12, and a connection portion 14 (hereinafter, referred to as the trunk line 11 and the branch line 13). And a cover member 15 attached in close contact with the branching portion 14).

  The electrical connection of the branch line 13 to the main line 11 is performed as follows. That is, after covering 11a of branch line 13 in trunk line 11 and 13a of branch line 13 are peeled off, conductor 13b of branch line 13 is connected to conductor 11b of trunk line 11 via connector 12.

  The cover member 15 is made of a material such as rubber having required electrical insulation and elasticity, and has a tubular shape and one end portion (lower end portion in FIG. 1) formed in a bifurcated shape to insulate and protect the branch portion 14. .

  That is, the cover member 15 is attached so as to be in close contact with the outer surface of the branching portion 14 before laying the cable, and the bifurcated end portion (the lower end portion in FIG. Fixed to the line 13. Further, after laying the cable, the cover member 15 is deformed so as to expand the outer diameter by being compressed by a distance corresponding to the length of the arrow A in the direction of the arrow A in FIG. At the same time, the other end portion in the longitudinal direction (the upper end portion in FIG. 3) is fixed to the trunk line 11 by the insulation lock member 16. Thereby, the cover member 15 is ensured with a required insulation distance in the radial direction between the branch portion 14.

  In the above embodiment, in order to deform the cover member 15 so that the outer diameter of the cover member 15 is expanded after laying the cable, a member (not shown) that serves as a skeleton that supports the cover member 15 may be attached.

The operation of this embodiment will be described.
Before laying in a building, apartment house, factory, tunnel, etc., the branch cable 10 is attached so that the cover member 15 is in close contact with the outer surface of the branch portion 14, and the bifurcated end portion of the cover member 15 (the lower end in FIG. 1). Part) is fixedly fitted to the trunk line 11 and the branch line 13 by the insulation lock member 16 and is smoothly inserted and laid in a through hole (not shown) at the laying place.
After laying, the branch cable 10 is compressed so that the cover member 15 is compressed along the longitudinal direction of the trunk line 11 to expand the outer diameter, and the other end in the longitudinal direction of the cover member 15 (the upper end in FIG. 3). Part) is fixed to the trunk line 11 by the insulation lock member 16. Thereby, a required insulation distance is ensured between the cover member 15 and the branch part 14 in the radial direction.

  As described above, according to the above-described embodiment, the cover member 15 is attached so as to be in close contact with the outer surface of the branching portion 14 before laying the cable, and is compressed along the longitudinal direction of the trunk line 11 after laying the cable. Thus, the outer diameter is deformed.

  Therefore, the diameter of the branch portion 14 can be reduced when the cable is laid, workability can be improved, and sufficient insulation performance can be ensured for the branch portion 14 after the cable is laid. Moreover, since it is not necessary to form the branch part 14 by injection molding etc., a large sized equipment like an injection molding machine can be made unnecessary for manufacture, and productivity improvement and cost reduction can be aimed at.

It is a principal part schematic side view which shows the state before construction of the branch cable which is one Embodiment of this invention. It is a schematic sectional drawing of FIG. It is a principal part schematic side view which shows the state after construction of the branch cable of FIG. FIG. 4 is a schematic sectional view of FIG. 3. It is a principal part schematic sectional drawing which shows the deformation | transformation of the cover member before construction after the construction of the branch cable of FIG. It is a schematic side view which shows the conventional branch cable. It is principal part sectional drawing of the branch cable of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Branch cable 11 Main line 11a Cover of trunk line 11b Conductor of main line 12 Connector 13 Branch line 13a Cover of branch line 13b Conductor of branch line 14 Connection part (branch part) of main line and branch line
15 Cover member 16 Lock member (Insulation lock member)

Claims (2)

A trunk line, a branch line that is electrically connected to the trunk line via a connector, and a tube made of a material having required electrical insulation and elasticity, and is in close contact with the connecting part of the trunk line and the branch line A cover member that covers the connection portion by being attached;
The cover member is deformed so as to expand its outer diameter by being compressed along the longitudinal direction of the trunk line after laying the cable, and a predetermined insulation distance is ensured in the radial direction between the cover part and the cover member. A branch cable characterized by that.   2. The branch cable according to claim 1, wherein the cover member is fixed to the main line by a lock member at both ends in a longitudinal direction in a state where the cover member is deformed so as to expand the outer diameter after laying the cable.

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