JPS5821207A - Detaining part of reinforcing tube for optical fiber - Google Patents

Abstract

PURPOSE:To obtain stable detaining force by sandwiching tensile fibers between an inside metallic sleeve and an outside metallic sleeve inserted onto a plastic pipe and press sticking the outside metallic sleeve. CONSTITUTION:After a plastic sheath 3 of a reinforcing tube for optical fibers is stripped in a prescribed position, tensile fibers 2 are placed uniformly on the circumference of a plastic pipe 1 by inserting a metallic inside tube 10 from the leading end of said tube, then an adhesive material 13 is coated thereon. Before the material 13 sets, a metallic outside sleeve 11 is put on the outside circumference of the fibers 2 and is press stuck at a number of positions. Finally, a case 14 for the detaining part is fixed to the sleeve 11, and a screw 9 for fixation is fitted. A rubber sleeve 16 is put on the case 14 and is fixed to a detaining plate. Since the tensile fibers are sandwiched between the sleeves 10 and 11 and are held press stuck from the outside, the fibers are hard to sag and provide stable detaining force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a retainer IIK of a reinforcing tube for optical 7 eyelids that is placed over a protective film for an optical fiber core drawn out from a terminal of a communication cable into a repeater body, etc. It is.

In order to prevent the optical fiber core used for wiring inside the repeater body from breaking due to human manipulation, an optical fiber reinforcing tube is often used to cover the fiber core. 3 is a cross-sectional view of a reinforcing chip for optical fibers used from /) a plastic pipe made by Nihon Co., Ltd.; , its outer diameter is approximately Jam. Of these, against artificial tension from the outside,
The tensile strength fibers have a strong electric current, and zoooo-to
Keppra fiber of 0.00 denier is used. Therefore, the tensile strength of the reinforcing tube for optical fibers is 100 kf or more. In order to fully demonstrate the original performance of such reinforcing tubes for optical fibers, it is necessary to use tensile strength fibers at the retaining portions of the reinforcing tubes. It is necessary to hold it firmly and to prevent it from sagging and rolling around. In this case, the target retention strength is said to be approximately 0.

FIG. 2 is a vertical cross-sectional view of a conventional retaining part using resin for casting, and the reference is epoxy resin! is a retaining plate. There is a method of gripping the retaining part shown in Figure 2 by bonding epoxy resin and tensile strength fibers, but if you just embed very thin fibers in the resin like this, the fibers will break when the resin hardens. Since the □ inside the resin becomes 1 IIK apart and protrudes freely, there is a large variation in the retention strength r, and there are cases where the target J'01# strength station is not satisfied.

Next, FIG. 1 is a longitudinal cross-sectional view of a conventional retaining part that mechanically grips tensile strength fibers, in which 4Fi tapered inner sleeve, 7ti tapered outer sleeve l is a holding screw, t is a fixing screw, The retaining bone tin shown in Fig. 3 has a structure in which the tensile strength fibers are folded back and inserted between the tapered inner sleeve 4 and the tapered outer sleeve 7 and tightened. The disadvantages are that the tensile strength fibers tend to sag during operation, and the gripping force is also weak. In an experiment on the retention strength using this structure, the gripping force was 1 to 1, and the gripping force was 1/all.

The present invention has been made to solve these shortcomings.In order to avoid electrophoresis, a high-strength fiber is inserted into the outer periphery of a plastic pipe, an adhesive is applied between the inner sleeve and the outer metal sleeve, and tensile strength fibers are sandwiched between them. , the tensile strength fibers are gripped by crimping the metal outer sleeve, and the strength of the tensile strength fibers is gripped by using both the crimping force of the metal sleeve and the adhesive force of the adhesive. The present invention will be described in detail with reference to the drawings below, which aims to obtain a stable structure and a tensile force.

FIG. 1 is a longitudinal sectional view of an embodiment of the reinforcing tube retaining portion for optical fiber according to the present invention, and io is a metal inner sleeve 1. , +'i<, is the metal outer sleeve, /, 2 is the metal outer sleeve crimping part, /J is the adhesive, l- is the retaining case, l! is a case rotation stopper, and 14 is a rubber sleeve. Steel, brass, stainless steel, etc. are suitable materials for the metal inner sleeve 10 and metal outer sleeve. The outer diameter is 4 o, ko~Q, and the inner thickness is 0, ko~0.
, J sm , the fleaness is 10 to 10. The metal outer sleeve // is the metal inner sleeve 10 and 01.
M511 is Oj ~0.1mwh, 111 in Ruyo Uni
-Nanka, wall thickness 0. J~0. J Ling, the length is 70~ko θ
In order to assemble this retainer, first attach the plastic jacket of the fiber reinforcing tube to the specified position by providing a threaded part at one end so that the retainer case can be attached. After stripping, the length of the tensile strength fiber is adjusted and the metal inner sleeve 10 is inserted from the tip of the plastic pipe l. Next, line the pile tension line -2 evenly along the circumference around the outer circumference of the metal inner sleeve IO, and apply a small amount of adhesive /J to the metal outer sleeve IO. / from the side of the plastic ivy jacket J, and apply adhesive to the outer periphery of the nine tensile strength fibers K.
11. Crimp the metal outer sleeve/l in several places using a crimping bench ◇ In this case, epoxy resin is used as the adhesive J, and the crimping shape of the T + crimping pliers is set so that the tensile fibers are not biased to one part. A rectangular one is suitable, and the metal outer sleeve crimping part/J has a cross-sectional area of 7 after crimping compared to before crimping. Suitable dimensions are such that the quality is constant.

Finally, fix the metal outer sleeve tiK retaining part case/II, then attach the fixing screw DE, cover the rubber sleeve 14 over the retaining part case/II, and fix it to the fixing screw and then to the retaining part. When setting the retainer INK, set the retainer part case to 9 cases - Roll stop I! Align the retaining plate with the position of the retaining plate to prevent the entire retaining part from being folded.

In order to grip the tensile strength fibers, this retaining part is inserted straight between the metal inner sleeve 10 and the metal outer sleeve /l, and is crimped from the outside, so when making the retainer part, The tensile strength fibers become sagging and become loose.

In addition, since tensile strength wire 11KJ bonding material is applied before crimping, it is possible to sufficiently impregnate the tensile strength fibers with the adhesive material. After the trench bonding material has hardened, the adhesive strength of the adhesive material increases. As expected, sufficient gripping force can be obtained.

In fact, the tensile test results showed that the gripping force of the retaining part produced in this way was sufficient, with the strength of JO-10k4I being 69 and the weight of the retaining part being less than j -0.4 mm. It has been confirmed that the outer diameter of the retainer was f%F1-1.

The following figure is a vertical cross-sectional view of an embodiment of the present invention in which the retaining part shown in Figure 1 can be made to have a diameter of -48 mm, and 17 is a sleeve rotation stopper provided on the metal outer sleeve. The gripping method is the same, but the retaining part case l# is screwed directly to the retaining plate j, and the outer diameter of the retaining part is Jo~J#- compared to the embodiment shown in Fig. Can be made small - State of the Invention As explained above, it takes only one plastic to hold the #IL tension fiber of the optical fiber reinforcement cord! Since the tensile strength fibers are inserted into the steel strip closely around the outer circumference of the pipe, and between the metal inner sprue and the metal outer sleeve, the tensile strength fibers are inserted into the steel sheet, so there is no resistance when making the retaining part. It is difficult for the tension line 111 to bend, and the gripping force is obtained from both the compression force of the metal outer sleeve and the adhesive applied to the tensile strength fibers, so it has sufficient strength. There is an advantage that the optical fiber core wire accommodated in the optical fiber reinforcing cord is less likely to be damaged.

This retaining part is small and lightweight, so it can be applied to the fiber pull-out part into the repeater case and the fiber termination part at the end of the communication cable*.It has a structure similar to that of an optical fiber reinforcing tube. It can also be used as a tensile strength fiber gripping part of an optical connector for attaching the Optical 7 EyePacord Kl.

[Brief explanation of the drawing]

Figure 91 is a cross-sectional view of a reinforcing tube for optical fibers, Figure J is a vertical cross-sectional view of a conventional retaining part using a crimp resin, and Figure 91 is a longitudinal cross-section of a conventional retaining part using a tapered sleeve. Figures 1 and 2 are longitudinal cross-sectional views of an embodiment of a retaining crane according to the present invention, and Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention in which the retaining portion of Fig. 1111 is further removed. l...plastic pipe, co...tensile strength, J
... Plastic ivy outer covering, etc. Epoxy resin,!・
...Retaining plate, 4...Tapered inner sleeve, 7...
・Tapered outer sleeve, S... Holding screw, 2...
Identification screw, 10...Metal inner sleeve, //...Metal outer sleeve, l...Metal outer sleeve crimping part, /J
...adhesive material, /tei...retaining part case, l! ...
Case rotation stopper, 14...Rubber sleeve, /7...
Sleeve rotation stopper. Patent applicant: Nippon Telegraph and Telephone Public Corporation 39-

Claims (1)

[Claims] 1. A tensile strength material such as Kepler is longitudinally placed on the outer periphery of a plastic pipe with an inner diameter 4 larger than the party 7 Aipah core wire, and the outer periphery is coated with plastic, and in the retaining part of the optical fiber reinforcing tube, Outer circumference K of the plastic pipe
. Insert a metal inner sleeve with an inner diameter slightly larger than that of the plastic pipe and a metal outer sleeve with an inner diameter larger than the outer diameter of the metal inner sleeve, and apply an adhesive such as 1 epoxy between the metal inner sleeve and metal outer sleeve. The nine tensile strength fibers are coated or impregnated with the same material and are arranged evenly on the circumference, the tensile strength fibers are gripped by crimping the metal outer sleeve, and the metal outer sleeve is fixed to the retaining plate with screws. Features: Retaining part of reinforcing tube for party fiber.