JPH0239202U

JPH0239202U -

Info

Publication number: JPH0239202U
Application number: JP11684388U
Authority: JP
Priority date: 1988-09-07
Filing date: 1988-09-07
Publication date: 1990-03-15

Description

[Brief explanation of drawings]

第１図ａ，ｂは、本考案に係る制限可撓保護管
付きの光フアイバケーブルの拡大断面図であり、
そのうち、第１図ａはコード集合型ケーブルの場
合を示し、第１図ｂは芯線集合型ケーブルの場合
を示している。第２図ａ，ｂは、第１図ａ，ｂに
夫々対応していて、光フアイバケーブル先端の光
フアイバ芯線（コード）が曲げられたときの本考
案の制限可撓保護管の状態を示す拡大断面図であ
る。第３図は、本考案に係る制限可撓保護管の構
造の一具体例を示す断面図である。第４図ａは、
コード集合型ケーブルを用いた従来例に係るコネ
クタ付き光フアイバケーブルの略図である。第４
図ｂは、芯線集合型ケーブルを用いた従来例に係
わるコネクタ付き光フアイバケーブルの略図であ
る。第５図ａ，ｂは、第４図ａ，ｂに夫々対応し
た光コネクタ付き光フアイバケーブルの使用時の
一状態を示し、下方に引つ張つて光フアイバ芯線
（コード）２の付け根６が折れ曲がつた状態を示
す略図である。第６、第７図は、従来における類
似の光フアイバ芯線（コード）の折れ曲げ防止器
具を示す。１：光フアイバケーブル、２：光フアイバ芯線
（コード）、３：光コネクタ、４：固定部、５：
成端部、６：光フアイバ芯線（コード）の光フア
イバケーブル側の付け根、７：拡径部、８：縮径
部、９：プラグ、１０：ブツシユ、１１：湾曲凸
部、１２：制限可撓保護管、１３：断面角Ｓ字形
金属部材。 1a and 1b are enlarged cross-sectional views of an optical fiber cable with a limited flexible protection tube according to the present invention,
Of these, FIG. 1a shows the case of a cord assembly type cable, and FIG. 1b shows the case of a core wire assembly type cable. Figures 2a and b correspond to Figures 1a and b, respectively, and show the state of the limited flexible protective tube of the present invention when the optical fiber core wire (cord) at the tip of the optical fiber cable is bent. It is an enlarged sectional view. FIG. 3 is a sectional view showing a specific example of the structure of the limited flexible protection tube according to the present invention. Figure 4a is
1 is a schematic diagram of a conventional optical fiber cable with a connector using a cord assembly type cable. Fourth
FIG. b is a schematic diagram of a conventional connector-equipped optical fiber cable using a core wire assembly type cable. FIGS. 5a and 5b show a state in which the optical fiber cable with an optical connector corresponding to FIGS. 4a and 4b is used, and the base 6 of the optical fiber core wire (cord) 2 is It is a schematic diagram showing a bent state. 6 and 7 show similar conventional bending prevention devices for optical fiber core wires (cords). 1: Optical fiber cable, 2: Optical fiber core wire (cord), 3: Optical connector, 4: Fixed part, 5:
Termination part, 6: Root of optical fiber cable side of optical fiber core wire (cord), 7: Expanding diameter part, 8: Reducing diameter part, 9: Plug, 10: Bush, 11: Curved convex part, 12: Restriction possible Flexible protection tube, 13: S-shaped cross-sectional angle metal member.

Claims

[Claims for Utility Model Registration] (1) It has a tubular structure in which ring-shaped or spiral-shaped rigid members having engaging portions at both ends are successively connected, and furthermore, the members move freely relative to each other in the axial direction. Although the tube as a whole has flexibility, it is configured to restrict the movement of the member in the axial direction of the tube, and when the optical fiber core wire (cord) is bent, the core wire (cord) A limited flexible protective tube that does not bend to a bending radius smaller than the minimum bending radius that does not cause any abnormality in performance, but can be bent freely beyond the minimum bending radius, is removed when the outer sheath at the end of the optical fiber cable is removed. 1. An optical fiber core wire (cord) terminal protection cable, characterized in that the optical fiber core wire (cord) is provided near the exposed optical fiber core wire (cord). (2) The terminal protection cable according to claim 1, wherein the rigid member having engaging portions at both ends is a metal member having an S-shaped cross section. (3) The terminal protection cable according to claim (1), wherein the terminal protection cable includes an optical connector.