JPS62237407A - Connection box for optical fiber composite wire - Google Patents

Abstract

PURPOSE:To secure a uniformly strong airtightness by equalizing a tightening and sealing force to a gasket, by integrally constituting the gaskets which are installed between a cover part and a body, and to a wire inserting part. CONSTITUTION:A body side gasket 6 and a gasket 7 of a wire inserting part are constituted as that of an integral structure just like a spectacle shape. By tightening a connection box body 1a and a cover part 1b, the gasket 6 of the body side and the gasket 7 of the wire inserting part are tightened as one body simultaneously, the airtightness which has been equalized to the whole body can be firmly secured, an assembly property of the connection box is simplified and the connection box of a moisture-proof structure having a high safety is obtained. In this regard, the gasket can be obtained by both a method for connecting integrally that which has been manufactured by dividing it into each part, and a method for forming it integrally by molding.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is applicable to, for example, an optical fiber composite overhead ground wire (hereinafter referred to as 0PGW).
The present invention relates to a junction box for connecting an electric wire to an optical fiber, in which an electric wire and an optical fiber for signal transmission are integrated into one.

[Prior art and problems] For example, in order to connect 0PGW, in order to avoid applying overhead line tension to the built-in optical fiber, the electric wire is tied to the tower using a retaining clamp in the usual way, and the optical fiber is The remaining length of the electric wire is pulled down to a suitable place on the steel tower, and the optical fiber 10 is connected in a tension-free state within a junction box 1 as shown in FIG.

If moisture intrudes into such a junction box, it will have a negative effect on the transmission characteristics of the optical fiber, so conventionally
As shown in FIG. 2, which is a sectional view taken along line A-A in FIG.
A gasket 3 was separately installed between the junction box body 1a and the lid part 1b, and a gasket 4 was separately installed at the wire insertion part to prevent moisture from entering.

However, when the gaskets are arranged separately in this way, it is difficult to maintain the same airtight properties, and differences in outside temperature can cause pressure fluctuations inside the junction box, resulting in insufficient airtightness. There was a risk of moisture infiltrating.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and provides an optical fiber composite that has an integral structure of the junction box body, the lid part, and the gasket of the wire insertion part, and which provides uniform airtightness. The present invention aims to provide a junction box for electric wires.

[Summary of the Invention The gist of the present invention is that the gaskets between the junction box body and the lid part and the wire insertion part are constructed as one piece, so that the gasket can be tightened by evenly dividing the sealing force. The structure is such that uniformly strong airtightness can be ensured.

[Example] This will be explained below based on examples.

FIG. 3 shows an embodiment of the gasket used in the junction box according to the present invention, in which the main body side gasket 6 and the electric wire insertion part gasket 7 are constructed as an integral structure in the shape of a pair of glasses. . Note that 8 is a notch to facilitate insertion.

FIG. 4 shows a cross-sectional view of a junction box according to the present invention to which the gasket shown in FIG. The gasket 7 of the wire insertion part is tightened together at the same time, ensuring evenly distributed airtightness throughout the whole, making it extremely easy to assemble the junction box, and creating a connection with a highly safe moisture-proof structure. I was able to provide the box.

In addition, to obtain a gasket like the one mentioned above, you can also manufacture it separately and connect them together.
Alternatively, it may be integrally formed by molding. Of course, the shape of the gasket can be formed to match the shape of the connection box, but the cross section of the gasket itself is not limited to a round cross section, and can be any shape such as a rectangular shape.

Further, the inside of the gasket of the cable insertion part must be round to match the electric wire (OP unit), but the outside shape may be either round or square. Further, the notch 8 that facilitates the insertion of the electric wire may be joined with an adhesive or the like after the cable is inserted.

[Effects of the Invention] As described above, according to the junction box of the present invention, the body of the junction box and the wire insertion part can be integrally and evenly divided to be strongly airtight, and the safety against moisture intrusion is further improved. The significance of what I have gained is enormous.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of a junction box for optical fiber composite electric wires, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is a sketch showing an embodiment of the gasket according to the present invention, and FIG. 4 is a cross-sectional view showing the state of a junction box equipped with the gasket according to the present invention. 1... Connection box 1a... Connection box body 1b... Lid part 3.4... Conventional gasket 5... Electric wire 6... According to the present invention Body side gasket 7...
...Gasket 8 of electric wire insertion part according to the present invention...
...Optical fiber agent Patent attorney Sa Rei Fujio High School 1st edition? 3 mouths too

Claims (1)

[Claims] (1) An optical fiber in which the gaskets attached between the lid and the main body and on the wire insertion portion are configured as one piece, and the lid and the wire insertion portion are configured to be sealed with one continuous gasket. Junction box for composite wires.