JPH0112241Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a junction box that protects the connection part of an optical fiber cable.

Optical fiber cable connections are similar to communication cables using general electrical conductors in that a sleeve or junction box is provided around the outer periphery of the cable connection to surround the entire connection, but optical fiber The internal structure of the connection part is quite different in that the cable core has a high chance of breakage, so a sufficiently long extra length is required for the work. The general method for determining this extra length is to spiral the cable core two to three times within the connection portion and fix it.

However, optical fiber cable cores tend to break when the bending radius is made small, so care must be taken not to make the spiral radius small; however, when connecting a large number of cables in a conventional cylindrical sleeve, the cables can bend in three dimensions. This makes it difficult to maintain a bending radius with sufficient margin.

In order to solve this problem, attempts have been made to fix the board within the sleeve so that the cable spirals within the same plane, but the cylindrical sleeve has a bad space factor and tends to make the connection work complicated.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an optical fiber cable connection box suitable for straight connection or branch connection of optical fiber cables.

As shown in the embodiment of the figure, the present invention consists of a flat plate-like main body A having a recess 1 for accommodating a cable connection part in the center, and a lid body B that engages with the main body A and isolates the recess 1 from the outside. , a cable fixing groove 3 connected to the recess 1 from the outside of the main body is provided on the peripheral edge 2 of the main body, a cable tension member clamp 4 is provided near the fixing groove, and a cable tension member clamp 4 is provided on the peripheral edge 2 of the main body A in the flat direction. The present invention relates to an optical fiber cable junction box characterized in that a through hole 5 for multiple connections is provided perpendicular to the fiber optic cable. In the figure, the sheath at the end of the optical fiber cable C has been removed, and a cable core 6 wound spirally to provide extra length is connected at a connection sleeve 7.

Further, since the cable tension member 8 is buried in the sheath of the cable C or inserted into the cable in parallel with the cable core 6, it is fixed by being wrapped around the clamp 4 made of screws or the like. The main body A and the lid B are airtightly engaged by applying silicone rubber or the like to the peripheral edge 2 of the main body A and then overlapping them. The through hole 9 is a screw hole for screwing the main body A and the lid B together at this time. In the example shown in the figure, two single-core cords are connected in a straight line, but even if the number of wires to be connected increases to 2-core or 3-core, the spouse factor, which creates a spiral in a plane and connects it, is also easy to work with. Also good.

Furthermore, if a large number of cable insertion holes 3 are provided, branch connections are also possible. In addition, when multiple connections of this type can be installed at the same location, multiple connection boxes can be fixed together since multiple connection through holes 5 are provided, and moreover, they can be fixed vertically to a wall surface, etc. It also has the advantage of being easy.

Furthermore, if the cable bending radius limiting member 10 is fixed in the cable connection portion accommodating recess 1, it is possible to maintain the cable core at a predetermined curvature by winding the optical fiber cable core around the outside of the cable bending radius limiting member 10. As shown in the figure, when a disk-shaped bending radius limiting member is provided in a flat junction box, it not only acts as a core for winding the fiber, but also creates a space in the flat junction box that can accommodate the cable core. Since the cable core is forcibly regulated, there is no possibility of accidentally applying excessive bending during the work of housing the cable core.

For this reason, the junction box of the present invention has the advantage of much better workability than a cylindrical connector in which the cable core is wound around a tube or the like beforehand and then housed in the outer box.

[Brief explanation of the drawing]

The figure is a perspective view of an embodiment of the junction box of the present invention, where A is the main body, 1 is the recess for the cable connection part, B is the lid body,
3 is a cable fixing groove, 4 is a tension member clamp, 5 is a through hole for multiple connection, C is a cable, 8
Reference numeral 10 indicates a messenger wire of the cable, and 10 indicates a bending radius limiting member.

Claims (1)

[Scope of utility model registration request] It consists of a flat plate main body having a recess for accommodating a cable connection part in the center, and a lid that engages with the flat plate main body and isolates the recess from the outside, and has a cable fixing groove connected to the recess from the outside of the main body at the peripheral edge of the main body. A cable tension member clamp is provided near this fixing groove, a disk-shaped cable bending radius limiting member is fixed in the cable connection part accommodation recess, and a cable tension member clamp is provided on the peripheral edge of the main body perpendicular to the flat direction. An optical fiber cable connection box characterized by being provided with a through hole for multiple connections.