JPH0631441Y2 - Terminal structure of optical fiber cable with connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a terminal structure of an optical fiber cable with a connector.

(Problems to be solved by conventional techniques and devices) Optical fiber cable connection requires precision so that the centers of the optical fibers are exactly aligned, and it is generally used at the construction site by using a dedicated fusing device. However, in order to make the connection at the installation site more efficient, by fitting the connector at the installation site, it is possible to connect the cables easily, so that the connector is installed in advance at the time of factory shipment. I have something to do.

For this reason, various studies have been made. As an example, as shown in Japanese Utility Model Laid-Open No. 59-48516, a spacer is fitted to the end of the flexible protective case and is tightened from the outside with a band. Tighten and wrap PVC tape on it,
Some are watertight, but the overall structure is complicated, it is difficult to remove the spacer, and because the tightening band is used, neither the spacer nor the protective pipe can withstand repeated use. It was expected that a structure that would withstand repeated use would emerge.

Further, as disclosed in Japanese Utility Model Laid-Open No. 59-112121, a protective pipe for protecting the connector attached to the end of the optical fiber cable is hermetically attached to the end of the optical fiber cable. In the terminal structure of the fiber cable, one end of the protection pipe is supported by a conical end cap mounted on the outer jacket of the cable body, and the other end has a second protection pipe. A terminal structure of an optical fiber cable with a connector, which is formed by molding the sealing material on the conical end cap and one end of the protective pipe after covering and reinforcing, is proposed. Two
It is troublesome to reinforce with a protective pipe.

(Means for Solving the Problems) The present invention has been solved by the following configuration in view of such circumstances.

A terminal structure of an optical fiber cable with a connector, in which a protection pipe for protecting a connector attached to an end of the optical fiber cable is airtightly attached to the end of the optical fiber cable, and one end of the protection pipe is provided. The part is supported by a conical end cap made of an elastic material mounted on the cable body jacket, the other end is supported by an end cap made of an inelastic material, and further made of said elastic material. A self-bonding tape and a protective PVC tape are laminated on the conical end cap and one end of the protective pipe, and a heat shrink tube is formed on the end cap made of the inelastic material and the other end of the protective pipe. A terminal structure for an optical fiber cable with a connector, which is characterized in that it is mounted.

That is, first, as shown in FIG. 1, the tension member 4 and the optical fiber 2 are connected to the optical fiber connector 3 having the connector protection plate 6 at the end of the cable body 1, and the tension member 4 is connected to the pooling eye 7. The PVC protection pipe 8 for protecting the connector during transportation, storage and installation of the cable is fixed with a PVC cap 9 at the mounting portion of the pooling eye 7, and is kept airtight by the polyethylene heat shrink tube 10 on the outside. On the other hand, the PVC protection pipe 8 is kept airtight by attaching an end material 11 made of a synthetic rubber, for example, an elastic material composed of a conical portion and a cylindrical portion, between the end portion on the cable body side and the cable body. Then, the synthetic rubber end cap 11 fitted and fitted into the inner cavity of the protective pipe and the self-bonding tape 12 are overlapped while applying tension so as to completely cover the joint portion of the cable body 1 and the protective pipe 8. The self-bonding tape 12 is wound, and the adhesive PVC tape 13 is wound on the outer side of the self-bonding tape 12 so as to completely cover it.

With such a configuration, the self-bonding tape is appropriately pressurized and flows between the outer pressing force of the PVC tape and the elastic end cap, so that the contact portion between the cable jacket and the end cap is It is hermetically sealed.
The other end of the protective pipe can be hermetically sealed by simply heating the heat-shrinkable tube.

(Effect of the Invention) According to the present invention, the terminal structure of the optical fiber cable with a connector, in which a protection pipe for protecting the connector attached to the end of the optical fiber cable is airtightly attached to the end of the optical fiber cable. The one end of the protective pipe is supported by a conical end cap made of an elastic material mounted on the cable body jacket, and the other end is made by an end cap made of an inelastic material. A self-bonding tape and a protective PVC tape are laminated on the conical end cap made of the elastic material and one end of the protective pipe, and the end cap made of the non-elastic material and the other end are attached. Since a heat shrink tube is attached to the end of the protective pipe, (1) the pressing force of the PVC protective tape and the end cap The adhesive layer of the self-adhesive tape properly flows due to the elasticity of the cap to improve its airtightness and waterproofness. (2) The relative bending between the cable and the terminal structure is due to the elastic deformation of the end cap. (3) Since the fixing means provided on the cable sheath is made of PVC protective tape and self-bonding tape, it does not require heat for fixing. There is no risk of damaging the cable sheath and easy disassembly and removal. (4) The other end where the cable is not present is sufficient by using the end cap and heat shrinkable tube made of non-elastic material. By heating, the inherent gripping force and airtightness of the heat-shrinkable tube can be used to secure the seal. (5) Pull the cable with a rope through the pooling eye. When laying, since the easy parts in contact with the pipe or the like made of the end cap and the heat-shrinkable tube of inelastic, is effective not damaged.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the terminal structure of an optical fiber cable with a connector according to the present invention. 1: Cable body, 2: Optical fiber, 3: Optical fiber connector, 4: Protective pipe, 11: Synthetic rubber end cap, 12: Self-bonding tape, 13: Protective PVC tape.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-101330 (JP, A) Actually opened 59-48516 (JP, U) Actually opened 59-90230 (JP, U) Actually opened 59- 112211 (JP, U) JP 59-32967 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A terminal structure of an optical fiber cable with a connector, wherein a protective pipe for protecting a connector attached to an end of the optical fiber cable is airtightly attached to the end of the optical fiber cable. One end of the pipe is supported by a conical end cap made of elastic material mounted on the cable body jacket, the other end is supported by an end cap made of inelastic material, and A self-bonding tape and a protective PVC tape are laminated on the conical end cap made of the elastic material and one end of the protective pipe,
A terminal structure for an optical fiber cable with a connector, characterized in that an end cap made of the non-elastic material and a heat-shrinkable tube are attached to the other end of the protective pipe.