JPS628008Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intra-office termination section of an optical fiber cable.

BACKGROUND OF THE INVENTION An optical fiber cable led into an office is coded with an optical fiber core 16 at the intra-office termination section.

In that case, for the in-office termination part, 1. Preventing moisture from entering the cable section, 2 Consideration for the tension acting on the cable, 3 Measures against tension acting on the cord, 4 Protection against the external environment; The following characteristics are required.

The object of this invention is to provide an intra-office termination section for optical fiber cables that satisfies the above requirements.

Example This is an example in which an intervening metal core wire is included.
The intervening metal core wire is grouped together separately from the optical fiber core due to the processing of MDF, etc. However, this intervening metal core wire part has no direct relation to the gist of the present invention.

In FIG. 1, 10 is the entire optical fiber cable, 12 is a cable sheath, 14 is a tension member, 16 is an optical fiber core, and 18 is an intervening metal core.

Each optical fiber core 16 is covered with a plastic tube 22 containing tensile strength fibers 20 such as Kevlar (trade name) to form an optical fiber cord 24, as described above. Note that a connector 26 is attached to the tip of each optical fiber cord 24.

Furthermore, all the intervening metal core wires 18 are bundled together, and a plastic tube 2 is placed on top of the metal core wires 18.
8 constitutes an intervening cable 30.

32 is a sheath gripping tool. This is a cylindrical item made of metal such as stainless steel, and has a screw 34 tightened on the inside. And this sheath gripping tool 32
is fixed by screwing the screw 13 at the end of the cable sheath 12 tightly.

36 is the end cap, which is made of plastic such as PVC. This is the rear (first
It consists of a cylindrical body with a tapered outer surface that slopes downward toward the left in the figure (Fig. 2). The inner surface of the rear half 38 is thick enough to fit snugly on the cable sheath 12, and the front half 40
The inner surface of the sheath gripper 32 is as thick as the inner surface of the sheath gripper 32, and the border thereof forms a stepped portion 42. For example, four holes 44 are provided at equal intervals on the front surface 43.

The end cap 36 is designed so that the stepped portion 42 is pulled by the sheath gripping tool 32 and cannot be pulled out.

Reference numeral 46 denotes a clamp fitting, which is made of metal such as stainless steel (Fig. 3). 48 is its main body, for example a short cylindrical body. There is a hole 50 in the center, and a screw hole 5 communicating with the hole 50.
2 are provided in the radial direction. Further, four stays 56, for example, protrude radially from the side surface of the main body 48, and are bent rearward from the middle.

This clamp fitting 46 is attached to a hole 5 in the exposed tension member 14 (cut appropriately short).
0, and the rear ends of the four stays 56 are inserted into the holes 44 of the end cap 36, and are fixed to the tension member 14 with setscrews 54.

58 is a shell, which is a cylindrical body made of plastic such as PVC.

Reference numeral 60 denotes an end plate, which is also made of PVC or the like, and has circular holes 62 and 64 penetrated at appropriate locations. All the optical fiber cords 24 are pulled out together from the circular hole 62, and the interposed cable 30 is pulled out from the circular hole 64.

The rear end of the shell 58 is connected to the end cap 36.
It is fitted externally and fixed by adhesive etc.
Further, an end plate 60 is fixed to the tip of the shell 58 by adhesive or the like.

For the sake of convenience, the end cap 36 and the end plate 60 of the shell 58 are combined into one body and will be referred to as a protective cap 66. This protective cap 66 is filled with a moisture-proof compound 68 such as urethane resin.

Functions and Effects (1) The protective cap 66 protects against the external environment.

(2) The protective cap 66 of this intra-office termination section is fixed to the intra-office frame. In the present invention, the sheath gripping tool 32 is fixed to the cable sheath 12, and the inner surface of the protective cap 66 engages with the sheath gripping tool 32, so that it cannot be moved forward from a certain position. When a tensile force is applied to the cable sheath 12,
The sheath gripper 32 engages the protective cap 66 and counteracts that force.

(3) The main body 48 of the clamp fitting 46 is fixed to the tension member 14, and the stay 56 protruding from the main body 48 engages with the protective cap 66, so that the clamp 46 moves backward from a certain position relative to the protective cap 66. Since the tension member 14 cannot be moved, even if a force that pulls only the tension member 14 backward is exerted, it can resist it.

(4) Since the rear end of the tensile strength fiber 20 of the optical fiber cord 24 is fixed to the clamp fitting 46, and the clamp fitting 46 is fixed to the tension member 14, the force that pulls the optical fiber cord 24 forward is Even if you work, you can fight it.

(5) Moisture-proof compound 6 is inside the protective cap 66.
8, it is possible to prevent moisture from entering the optical fiber cable 10.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the invention, FIG. 2 a is a partial longitudinal sectional explanatory diagram of the end cap 36, b is a side view thereof, FIG. 3 a is an elevational view of the clamp fitting 46, and b is its side view. 10: Optical fiber cable, 12: Cable sheath, 14: Tension member, 16: Optical fiber core wire, 18: Interposed metal core wire, 20: Tensile strength fiber, 22: Plastic tube, 24: Optical fiber cord, 32: Sheath Gripping tool, 34: screw,
46: Clamp fitting, 48: Main body, 56: Stay, 58: Shell, 60: End plate, 66: Protective cap, 68: Moisture-proof compound.

Claims (1)

[Claims for Utility Model Registration] Cable sheath 12 of optical fiber cable 10
A sheath gripping tool 32 is fixed to the end of the optical fiber cable 10, and a protective cap 66 with a closed front end is placed over the end of the optical fiber cable 10, including the sheath gripping tool 32, to the front thereof. The rear inner surface of the cap 66 is engaged with the sheath gripping tool 32 so that it cannot be moved forward from a certain position, and the main body 48 of the clamp fitting 46 is fixed to the protruding tension member 14. And main body 48
A stay 56 protrudes from the protective cap 66, and the stay 56 engages with the protective cap 66 to close the clamp fitting 46.
cannot move rearward from a certain position with respect to the protective cap 66, and the exposed optical fiber core wire 16 has a tensile strength fiber 2 on it.
A plastic tube 22 containing a number 0 is covered to constitute an optical fiber cord 24, and the rear end of the tensile strength fiber 20 is fixed to the clamp fitting 46, and the optical fiber cord 24 is attached to the protective cap 66. An internal termination section for an optical fiber cable, characterized in that the protective cap 66 is penetrated through the front end face and pulled out to the outside, and the inside of the protective cap 66 is filled with a moisture-proof compound 68.