JP2803668B2 - Optical cord anchoring structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a retention structure of an optical fiber cord in which an optical fiber core is covered with a fiber bundle and the fiber bundle is covered with an outer cover, and the optical fiber core is covered with a fiber bundle such as aramid fiber. The purpose of the present invention is to provide a retaining structure for an optical cord in which the cord can be easily fixed and an operator does not vary when the optical fiber cord is retained. An optical fiber cord including a jacket is sandwiched in a thick portion, and an optical fiber core wire extending in a region where the jacket is stripped is accommodated in a thin portion of the groove,
An optical cord anchoring structure is characterized in that the fiber bundle in the area where the jacket is stripped is divided into a plurality of bundles, sandwiched between the joining surfaces, and the pair of metal fittings are fastened and fixed to each other. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cord retaining structure, and more particularly to an optical fiber cord retaining structure in which an optical fiber core wire is covered with a fiber bundle and the fiber bundle is covered with a jacket. An optical code used for optical communication needs to be connected to a transmission station device at both ends of a transmission path. If the optical cord is directly connected to the device at that time, the operability of the device deteriorates. Therefore, a method of temporarily converting the optical code into a connector-attached code and then connecting the device to the device is adopted. The optical cord retention structure of the present invention is suitable for use in a connection portion between an optical cord and a cord with a connector. [Prior Art] FIG. 5 shows a general optical cord with a connector, and FIG.
The figure is an enlarged sectional view taken along line VI-VI in FIG. In these figures, reference numeral 10 denotes an optical fiber cord, 11 denotes an optical fiber core wire, 12 denotes an aramid fiber bundle, 13 denotes a vinyl sheath as a jacket, 14 denotes an optical connector, and 15 denotes a connection point. As shown in the figure, the outside of the optical fiber core 11 is covered with a number of straight aramid fiber bundles 12 called Kevlar (registered trademark) in order to protect the optical fiber core 11 from tensile force, and the outside of the core is further subjected to elasticity. The optical fiber cord 10 is formed by covering the optical fiber cord 10 with a vinyl sheath 13 having a structure, and is fixed to the optical connector 14. When this optical fiber cord 10 is connected to a transmission line optical cord (not shown in FIGS. 5 and 6), the aramid fiber bundle 12 (vinyl sheath 13) on the opposite side of the optical connector 14 is used.
Out of the area) must be fixed against the tensile force. 7 and 8 are a front view and a side view of a conventional optical fiber cord anchoring structure. In these figures, 20 is a cord retaining tool, 21 is a cord fixing bush, and 22 is a fiber bundle fixing screw. Other numbers indicate the same parts as in FIGS. 5 and 6. As shown in the figure, conventionally, an optical fiber cord 10 including a vinyl sheath 13 is fixed by a cord fixing bush 21 near a position where the vinyl sheath 13 is peeled off, and a portion of the aramid fiber bundle 12 protruding from the vinyl sheath 13. Are roughly divided into two bundles, each of which is wound around a fiber bundle fixing screw 22 and these screws 22 are attached to the cord anchor 20.
The aramid fiber bundle 12 was fixed. [Problems to be Solved by the Invention] However, when two fiber bundle fixing screws 22 having the same right-hand thread are used, as shown in FIG. Since the other aramid fiber bundle 12 is pulled and fixed inside the screw 22, it is difficult to fix the left and right aramid fiber bundles 12 with a uniform pulling force, Has to be performed by a highly skilled person. Also, tap holes with one of the right and left fiber bundle fixing screws 22 having a right-hand thread and the other having a left-hand thread must also be provided with a right-hand thread and a left-hand thread, respectively. There was a problem that it was difficult. Accordingly, the present invention provides an optical cord having an optical fiber core wire covered with a fiber bundle such as an aramid fiber bundle, in which the mode fixing operation can be easily performed and the variation by the operator is eliminated. The purpose is to obtain a retention structure. [Means for Solving the Problems] In order to solve such problems, according to the present invention, an optical fiber cord in which an optical fiber core wire is covered with a fiber bundle and the fiber bundle is covered with a jacket is drawn. The structure to fasten,
The optical fiber cord including the jacket is sandwiched in the thick portion of the groove formed on the joint surface of the pair of metal fittings, and the optical fiber core wire extending to the region where the jacket is stripped is accommodated in the thin portion of the groove, and the sheath is formed. An optical cord retaining structure is provided, wherein the fiber bundle in the stripped area is divided into a plurality of bundles, sandwiched between the joining surfaces, and the pair of fittings are fastened and fixed to each other. [Operation] According to the optical cord retaining structure of the present invention, the fiber bundle divided into a plurality of pieces is sandwiched and fixed between the contact surfaces of the pair of metal fittings by a simple operation of simply tightening the pair of metal fittings together. In addition, the tensile force applied to each fiber bundle becomes uniform, and the work of fixing the optical cord is extremely simple and can be completed in a short time, and the variation by the operator is reduced. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows one embodiment of the optical cord anchoring structure of the present invention at a fixed position, and FIGS. 1 (a), (b) and (c) are a front view, a plan view and a side view, respectively. Also, the second
The figure shows the same embodiment in a non-fixed position, and FIG. 2 (a)
And (b) are a front view and a side view, respectively. The optical cord retaining structure of the present invention includes a pair of upper metal fittings 1a and lower metal fittings 1b that correspond to each other, and these metal fittings 1a and 1b are configured to be in contact with each other on the joint surface 2. The upper fitting 1a is formed with a groove 3a having a semicircular cross section for sandwiching the optical fiber cord 10 (vinyl sheet 13) extending from one end to the central portion on the joint surface 2, and is linearly formed in the groove 3a. A continuous groove 4a having a semicircular cross section for guiding the optical fiber core wire 11 and extending from the central portion to the other end is formed. Similarly, a corresponding groove 3b extending from one end to the center on the joining surface 2 of the lower metal fitting 1b, and a corresponding groove 4b extending straight from the groove 3b and extending from the center to the other end.
Is formed. Also, upper metal fittings are provided on both sides of the linear grooves 3a and 4a of the upper metal fitting 1a.
Holes 5 and 5 penetrating through 1a are provided, and tap holes 6 and 6 corresponding to the positions of the holes 5 and 5 are provided on both sides of the linear grooves 3b and 4b of the lower bracket 1b. Therefore, the screws 7, 7 are inserted through the holes 5, 5 of the upper fitting 1a to the lower fitting.
By tightening into the tap holes 6 and 6 of 1b, both metal fittings 1a,
1b can be brought into contact with each other on the surface 2 and fixed.
At this time, the cross section defined by the grooves 3a and 3b and the cross section defined by the grooves 4a and 4b are substantially circular, respectively, and the diameter of the grooves 3a and 3b is slightly smaller than the diameter of the vinyl sheath 13. The diameter of 4b is larger than the diameter of the optical fiber core wire 11 (about twice as large). This is when the two brackets 1a, 1b are fastened,
While fixing the vinyl sheath 13 of the optical fiber cord 10 so as not to move, the optical fiber core wire 11 is held so as to be freely movable so that an unreasonable tensile force or shear force does not act on the optical fiber core wire 11 itself. To do that. According to the optical cord retaining structure of the present invention, the optical fiber cord is retained and fixed as follows. First,
The vinyl sheath 13 of the optical fiber cord 10 is cut into a predetermined size. Next, the aramid fiber bundle 12 linearly entering the optical fiber cord 10 is roughly bisected. This is placed on the grooves 3b and 4b of the lower fitting 1b. At this time, the vinyl sheath 13 is inserted into the groove 3b, and the optical fiber core wire 11 is inserted into the groove 4b. Next, the upper fitting 1a is placed at the corresponding position on the lower fitting 1b, and the screws 7, 7 are inserted into the holes 5, 5 of the upper fitting 1a. Tighten 1a and 1b. The distance between the metal fittings 1a and 1b at the contact surface 2 is about 1 mm (that is, the distance at which the aramid fiber bundle 12 can be freely moved).
When the end of the vinyl sheath 13 is
The aramid fiber bundles 12, 12 divided into two are pulled to the left and right as shown in FIG. 1 (b) until they hit the step 9 between 4a and 4b. In this state, the screws 7 are tightly tightened. As a result, the aramid fiber bundles 12, 12 are brought into contact with the contact surfaces 2 of the metal fittings 1a, 1b.
Securely fixed with. Finally, aramid fiber bundles 12, 12
The portions protruding from the side portions of both metal fittings 1a and 1b are trimmed with a knife (not shown) or the like, and the operation is completed. Reference numeral 8 in FIG. 2 denotes a mounting hole for mounting the optical cord anchoring structure of the present invention to another device or the like. FIG. 3 is a view showing a state in which the optical cord anchoring structure of the present invention is attached to the device 30. 1 is an optical cord anchoring structure, 10 is an optical fiber cord, 11 is an optical fiber core wire, 30 is a device, and 36 is an optical fiber. A fixing screw for attaching the cord retaining structure 1 to the device 30. FIG. 4 is a schematic diagram of a transmission terminal apparatus for a submarine optical cable using the optical cord anchoring structure of the present invention. For example,
The optical cable 31 guided from the land side is converted into an optical fiber cord 10 with a sheath by the optical connector 14 and then retained by the optical cord retaining structure 1 of the present invention. After the optical fiber core wire 11 is wound around the extra length processing drum 32 a required number of times, it is connected to a sea side cable 34 by a splice fixing bracket 33. The seaside cable 34 is wound around another extra length processing drum 35 a required number of times, and then guided to a predetermined side. [Effects of the Invention] As described above, according to the optical cord retaining structure of the present invention, it is sufficient to simply tighten the attached metal fittings to each other. And the work can be performed in a shorter time without causing a variation in quality due to a difference in the skill level of the workers.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an optical cord anchoring structure according to the present invention at a fixed position, and FIGS. 1 (a), (b) and (c) are a front view and a plan view, respectively. 2 and 3 show the same embodiment in an unfixed position. FIGS. 2 (a) and 2 (b) are front and side views, respectively, and FIG. 3 is an optical cord anchoring structure of the present invention. FIG. 4 is a schematic view of a transmission terminal equipment for a submarine optical cable using the optical cord anchoring structure of the present invention, and FIG. 5 is a view showing a general optical cord with a connector. FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 5, and FIGS. 7 and 8 are a front view and a side view of a conventional optical fiber cord anchoring structure. 1a ... upper bracket, 1b ... lower bracket, 2 ... joint surface, 3a, 3b, 4a, 4b ... groove, 5 ... fixing hole, 6 ... tap hole, 7 ... fixing screw, 10 ... Optical fiber cord, 11: Optical fiber core wire, 12: Aramid fiber bundle, 13: Jacket (vinyl sheath).

Claims (1)

(57) [Claims] An optical fiber cord (10) in which an optical fiber core wire (11) is covered with a fiber bundle (12) and the fiber bundle is covered with a jacket (13)
With a thicker groove (3a, 3b) formed on the joint surface (2) of the pair of metal fittings (1a, 1b).
The optical fiber cord (10) including 3) is sandwiched, and the optical fiber core wire (11) extending to the area where the jacket (13) is stripped is accommodated in the narrow portion (4a, 4b) of the groove, and the jacket ( The fiber bundle (12) in the area where 13) has been stripped is divided into a plurality of bundles, sandwiched between the joining surfaces (2), and the pair of fittings (1a, 1b) are fastened and fixed to each other. Optical cord retention structure. 2. When the pair of brackets (1a, 1b) are fastened to each other,
The diameter of the thick portion (3a, 3b) of the groove is smaller than the diameter of the jacket (13) of the optical fiber cord (10), and the diameter of the narrow portion (4a, 4b) is the diameter of the optical fiber core wire (11). A structure as claimed in claim 1 which is larger. 3. 2. The structure according to claim 1, wherein the fiber bundle (12) is divided into two bundles and extends on both sides with respect to the grooves (3a, 3b; 4a, 4b). 4. The structure of claim 1, wherein said fiber bundle (12) comprises aramid fibers.