JPH0145221Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a connection structure for connecting or branching communication cables in small handballs and the like.

Conventionally, connecting or branching communication cables buried underground has been done using manholes or small handballs. In recent years, there has been a growing trend to use small handballs to reduce the cost of drilling these holes.

Figures 1 and 2 respectively show conventional examples of communication cable connection methods using a small handball, in which communication cables 2A and 2B guided into the small handball 1 are bent into a loop shape, and a half-split shape is formed. The connections were made within the plastic junction boxes 3 and 4, and sealed by resin injection.

However, with the connection method shown in FIGS. 1 and 2, if you want to branch the cables after connecting the communication cables 2A and 2B, a new junction box is required to pass the branch cables, and also inside the narrow small handball 1. The work efficiency is poor because the connection boxes 3 and 4 must be replaced and resin is injected, and cable connections or branch connections tend to be limited to horizontal and straight sections.

The purpose of this invention is to provide a connection structure in which communication cables are connected in a curved manner, and the connection part can be easily sealed by covering the connection part with a heat-shrinkable sleeve and shrinking it by heat. be.

This invention will be explained below based on embodiments shown in the drawings.

3 and 4 show an embodiment of this invention, in which the ends of the communication cables 2A, 2B and the branch cable 5 are respectively projected through a branch plate 6 and connected to form a connecting part 7, The connecting portion 7 is covered with a heat-shrinkable sleeve 8.

That is, as shown in FIG. 4, the branching plate 6 has cutout grooves 9, 9 formed on its outer periphery through which the communication cables 2A, 2B are inserted, and a plurality of (six in the illustrated example) auxiliary grooves 9, 9. Pipes 10, 10... are provided integrally. This auxiliary pipe 10 is formed with a branch outlet 11 for pulling out the branch cable 5, and this branch outlet 11 is normally closed and is penetrated when the branch cable 5 is passed through. Further, the branch plate 6 is made of a material that can be heat-sealed to the inner surface of the heat-shrinkable sleeve 8.

Further, the heat-shrinkable sleeve 8 is an improved version of the conventional heat-shrinkable sleeve that connects communication cables in a straight line and covers the connected portion by heat-shrinking action. An inner layer 12 made of a heat-sealable tape (for example, uncrosslinked high-flow polyethylene tape) that can be heat-sealed to the outer jacket and the outer peripheral surface of the branch plate 6;
An outer layer 18 is formed by pasting and integrating a heat-shrinkable tape (such as a stretched cross-linked polyethylene tape irradiated with radiation) that has better heat resistance than the heat-adhesive tape on the inner layer 12. One end is set to have an opening size that can be covered with the branch plate 6, and a protruding locking protrusion 14 is integrally provided along the circumferential direction on the outer periphery of the other end. In the embodiment, a plurality of pairs of locking protrusions 14 slightly shorter than the half-circumference dimension are provided at intervals in the length direction of the heat-shrinkable sleeve 8 .
Note that these locking protrusions 14 are connected to the heat-shrinkable sleeve 8.
The purpose is to suppress slippage on the surface of the surface of the holder, and a large number of simple protrusions may be arranged.

Moreover, what is indicated by the reference numeral 15 in FIGS. 3 and 4 is an auxiliary heat-shrinkable sleeve that is integrally placed over the branch cable 5 and the auxiliary pipe 10.

Next, the case where the connecting portion 7 is sealed by each component shown in FIG. 3 will be described.

First, corresponding to the number of branch cables 5 to be branched from the communication cables 2A and 2B, auxiliary pipes
0 through the branch outlet 11, and insert the tip of the branch cable 5 into the branch outlet 11 via the auxiliary heat-shrinkable sleeve 15, and make it protrude from the branch plate 5 in one direction (upward in FIG. 3). . In addition, the communication cables 2A, 2B are made to protrude in one direction from the branch plate 5 via the notch groove 9, and the core wires of these cables are connected to form the communication cables 2A, 2B and the connecting portion 7 into a U-shape. to curve it. At this time, one of the communication cables 2A, 2B may be curved to form the connecting portion 7 in a straight line.

Then, connect both communication cables 2A and 2B to the branch plate 6.
The heat-shrinkable sleeve 8 is placed in the notch groove 9 of the connecting portion 7, etc., and the heat-shrinkable sleeve 8 is placed over the curved portion such as the connecting portion 7 from the outside, and one end thereof is placed on the outer periphery of the branch plate 6. Along with heating and shrinking,
The inner layer 12 is heat-sealed to the outer periphery of the branching plate 6 and to the communication cables 2A and 2B in the cutout groove 9, respectively, to fill the gap and seal it.

In addition, the auxiliary heat-shrinkable sleeve 15 is placed over the auxiliary pipe 10 and heat-shrinked, and the branch cable 5, the auxiliary pipe 10, and the auxiliary heat-shrinkable sleeve 15 are integrated by heat fusion to form the branch outlet 1.
Seal 1.

On the other hand, since the locking protrusion 14 is continuous in the circumferential direction at the other end of the heat-shrinkable sleeve 8, the locking protrusion 14
As shown in FIG. 4, the rigidity of the inner layers 12 and 12 form a flat shape as shown in FIG.
Use 4 to hold together with paper clips. Then the inner layer 12,
The vicinity of the seam No. 12 is heated to cause thermal fusion and seal the gap between the seams. Through these sealing operations, the connecting portion 7 is completely sealed.

In addition, if the heat-shrinkable sleeve 8 is long, the third
It may be removed by appropriately cutting as shown in Figure A-A.

If further reconnection is to be performed, that is, if additional branch cable 5 is to be drawn out from the structure shown in FIG. After inserting the additional branch cable 5, dismantling the necessary parts of the connecting part 7, and connecting the core wires, cover with a new heat-shrinkable sleeve 8 and seal it in the same manner as described above. .

Therefore, according to this invention, the communication cable or connection part that passes through the branch plate is made into a curved shape, and the curved part and the heat-shrinkable sleeve placed over the branch plate are heat-shrinked to seal the cable. Therefore, it is advantageous when connecting communication cables in a small space such as a small handball because it can be easily sealed, and when adding a branch cable because the heat-shrinkable sleeve can be attached and detached from one direction. There is no need to dismantle all of the connections, making work easier. Furthermore, since a notch groove is formed on the outer periphery of the branch plate, and the communication cable is engaged with the notch groove, even after the connection part is formed, the communication cable can be inserted from the radius outside of the branch plate. It has the advantage of being easy to install and having good workability.

[Brief explanation of the drawing]

FIGS. 1A and 1B are a plan view and a front view showing an example of a conventional connection method using a small handball;
Fig. 2 is a front view showing another conventional example, Figs. 3 and 4 show an embodiment of this invention, Fig. 3 is a partially sectional front view of the main part, and Fig. 4 is a front view showing another conventional example. The figure is an exploded perspective view of the main components used for connection. 2A, 2B... Communication cable, 5... Branch cable, 6... Branch plate, 7... Connection part, 8... Heat shrinkable sleeve, 9... Notch groove, 10... Auxiliary pipe, 11... Branch Drawer opening, 14...locking protrusion.

Claims (1)

[Scope of utility model registration request] A connecting portion 7 for communication cables 2A and 2B is arranged on one side of a branch plate 6 provided with a branch outlet 11 from which a branch cable 5 is pulled out, and the communication cable at or near the connecting portion is arranged in a U-shape. A pair of communication cables that are curved and pulled out in parallel from the curved portion are connected to the notch groove 9 on the outer periphery of the branch plate.
One end of the heat-shrinkable sleeve 8 covering the curved portion is tightly placed around the branch plate and the communication cable, and the other end of the heat-shrinkable sleeve is brought together and heat-sealed. A communication cable connection structure characterized by being sealed by.