JP2007334159A - Method for easily increasing number of cables to be drawn, and drop closure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily increasing the number of cables to be drawn, etc. capable of increasing the number of fiber optic drop cables, even after the installation of a drop closure, without expanding an overall scale. <P>SOLUTION: In order to draw additional fiber optic drop cables 1 from a drop closure l0 after the number of cables drawn from the drop closure 10, having a sleeve 11 in which first, and second pendent parts 11<SB>1</SB>and 11<SB>2</SB>are formed on its bottom surface, has reached the limit, additional fiber optic drop cables 1 are drawn outside from the drop closure 10, by sandwiching them between the first and second pendent parts 11<SB>1</SB>and 11<SB>2</SB>of the sleeve 11. Since damage prevention measures for the additional fiber optic drop cables 1 are taken when drawing them outside from the drop closure 10, and since waterproof measures for the drop closure 10 are taken, first rubber packing 17<SB>1</SB>and second rubber packing 17<SB>2</SB>are provided to the first and second pendent parts 11<SB>1</SB>and 11<SB>2</SB>. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cable extension simple extension method and a drop closure, and more particularly, to a cable extension simple extension method and a drop closure suitable for increasing the number of optical drop cables that can be drawn from an already installed drop closure.

  With the spread of the Internet, FTTH (Fiber To The Home) that can transmit a high-speed and large-capacity signal to each home or office using an optical fiber has attracted attention. The optical drop cable drawn into the FTTH subscriber's home is a drop closure installed in the access optical cable network (see, for example, Patent Document 1 below). The number (hereinafter referred to as “the number of drawers”) is limited to 12 for the drop closure at the start of FTTH service, 32 for the drop closure that has recently been commercialized, and so on.

  There is no particular problem with using such drop closures in regions where the FTTH subscription rate is low, but in regions where the FTTH subscription rate is high, the number of optical drop cables has reached the limit. A situation has arisen in which an optical drop cable cannot be pulled out to a subscriber and a service cannot be provided.

  In addition, in the following Patent Document 2, the present applicant removes the extra length storage tray of the existing closure from the sleeve of the existing closure together with the optical cable in which the core wire is stored in the extra length storage tray, and the optical cable of the existing closure And a new closure having at least one extra extra length storage tray, the extra length storage tray removed from the sleeve of the new closure is attached, and the new closure is installed. A method for increasing the capacity of a closure for an optical cable, comprising a step of attaching an optical cable removed to a gripping portion of the closure is proposed.

In addition, in Patent Document 3 below, in order to efficiently perform the work of adding an optical fiber cable and to avoid the risk of losing parts during the work, a housing space for housing an existing closure internal unit is formed inside. And a connecting body fixing member for detachably fixing the connecting body for extension and the existing closure internal unit. The connecting body fixing member includes an inside of the existing closure. A pressing member for fixing the unit is attached, and the pressing member fixes a part of the existing closure internal unit between the connecting body fixing member and one end thereof is a connecting body fixing member. Optical fiber cable that is slidably supported with respect to the other end and is detachably fixed to the coupling body fixing member by a bolt設用 closure is disclosed.
JP 2004-163718 A JP 2005-148486 A Japanese Patent Laid-Open No. 10-10390

However, the method of newly installing a drop closure has the following problems.
(1) Equipment costs (repair costs) increase due to the new drop closure.
(2) The work efficiency of the access system optical cable trouble transfer deteriorates. In other words, even with a simple relocation work, the extra length cannot be used if there is a drop closure.
(3) Since the number of installed drop closures and the number of installation locations increase, the core management becomes complicated.
In addition, the optical fiber cable expansion closure as disclosed in Patent Document 3 requires a sleeve in which an accommodation space for accommodating the existing closure internal unit and the new closure internal unit is formed. There is a problem that the closure is greatly enlarged.

  An object of the present invention is to provide a cable extension simple extension method and a drop closure that can increase the number of optical drop cable extractions even after installation of the drop closure without significant increase in size.

The first cable drawing number simple extension method of the present invention is the number of pulling out of the drop closure (10) provided with the sleeve (11) having the first and second hanging parts (11 ₁ , 11 ₂ ) formed on the bottom surface. Is a method for easily adding an additional optical drop cable (1) from the drop closure after reaching the limit, wherein the additional optical drop cable is connected to the first and second of the sleeve. It is characterized in that it is pulled out from the drop closure by being sandwiched between the hanging parts.
Here, rubber first and second packings (17 ₁ , 17 ₂ ) are attached to the first and second hanging parts of the sleeve, and the additional optical drop cable is connected to the first of the sleeve. In addition, the extension optical drop cable may be prevented from being damaged when taken out from the drop closure by being sandwiched between the second hanging parts, and a waterproof measure for the drop closure may be taken.
The core wire (2) and the support wire (3) of the additional optical drop cable drawn into the drop closure are separated, and the separated support wire is fastened to a retaining metal fitting (16) attached in the drop closure. The additional optical drop cable may be supported by the drop closure.
Receiving metal fittings (18 ₁ , 18 ₂ ) with through holes formed along the longitudinal direction of the drop closure were attached to the outside of the drop closure, and the additional optical drop cable was received through the through holes of the receiving metal fittings. Later, it may be retracted into the drop closure.
According to the second method for easily extending the number of cable drawers of the present invention, the number of cable drawers for allowing an additional optical drop cable to be pulled out from the existing drop closure after the number of existing drop closures (110) reaches the limit. A left and right extension optical drop cable for introducing the extension optical drop cable into the existing drop closure on the outer periphery of the left and right end surfaces (112 ₁ , 112 ₂ ) of the existing drop closure. The left and right extension end face portions (150 ₁ , 150 ₂ ) in which the introduction ports (154 ₁ , 154 ₂ ) are formed are attached.
Here, the left and right additional end faces are two annular left and right additional end faces (151 ₁₁ , 151 ₁₂ ; 151 ₂₁ , 151 ₂₂ ) and the two left and right additional end faces. Left and right extension waterproof packings (152 ₁ , 152 ₂ ) provided between the plates, respectively, and the left and right extension end faces are attached to the outer periphery of the left and right end faces, and then the existing drop The expansion sleeve (171) is fixed to the closure, and the left and right expansion bolts (155 ₁ , 155 ₂ ) and the left and right expansion nuts (156 ₁ , 156 ₂ ) at the four corners of the left and right expansion end faces. And tighten the left and right extension end plates from both sides respectively, and use the left and right extension end plates to attach the left and right extension waterproof packings. May be compressed to bring the left and right extension end face portions into close contact with the left and right extension end face portions and the extension sleeve.

In the drop closure of the present invention, after the number of drawers of the drop closure (10) including the sleeve (11) having the first and second hanging parts (11 ₁ , 11 ₂ ) formed on the bottom reaches the limit. A drop closure that allows the extension optical drop cable (1) to be pulled out from the drop closure, and is attached to a housing space formed inside the drop closure by the sleeve, and the extension optical drop cable A retaining bracket (16) for holding the supporting optical line (3) and supporting the additional optical drop cable with the drop closure is provided, and the additional optical drop cable is connected to the first and second hanging parts of the sleeve. It is characterized by being pulled out from the drop closure.
Here, it further includes rubber first and second packings (17 ₁ , 17 ₂ ) attached to the first and second hanging parts of the sleeve, respectively, and the additional optical drop cable is connected to the sleeve. The extension optical drop cable may be prevented from being damaged when being pulled out from the drop closure by being sandwiched between the first and second hanging parts, and a waterproof measure for the drop closure may be taken.
A receiving bracket (18 ₁ , 18 ₂ ) attached to the outside of the drop closure and having a through hole formed along the longitudinal direction of the drop closure is further provided, and the additional optical drop cable is connected to the receiving bracket. It may be retracted through the through-hole and then drawn into the drop closure.
A number of holes equal to the maximum number of additional optical drop cables to be drawn into the drop closure are formed in a line along the longitudinal direction of the drop closure,
The support wire of the additional optical drop cable may be passed through the hole of the retaining metal fitting, wound around the retaining metal fitting, and retained.

The cable extension simple extension method and drop closure of the present invention have the following effects.
(1) Since it is not necessary to newly install a closure internal unit, the drop closure is not significantly increased in size.
(2) Since the number of optical drop cables can be increased even after installation of the drop closure, the equipment cost (repair cost) can be reduced.
(3) Since it is possible to increase the number of optical drop cables that can be drawn without hindering existing drop cables, operations can be performed at the convenience of the operator.
(4) Since the number of optical drop cables can be increased without cutting the access optical cable, the work efficiency of the access optical cable trouble transfer is not lowered.
(5) Since the number and location of drop closures do not increase, the management of the cores does not become complicated.

  For the above purpose, the additional optical drop cable can be pulled out from the drop closure by sandwiching the additional optical drop cable between the first and second hanging parts of the sleeve, or on the outer periphery of the left and right end surfaces of the existing drop closure. This was realized by attaching the left and right extension end faces with the left and right extension optical drop cable inlets to introduce the cable into the existing drop closure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for easily adding cable leads and a drop closure according to the present invention will be described below with reference to the drawings.
In this specification, the optical drop cable until the number of drop closures already installed reaches the limit is called “existing optical drop cable” and can be pulled out from this drop closure after the number of drawers reaches the limit. The optical drop cable to be added in this way is referred to as “additional optical drop cable”.

First, the cable extension simple extension method according to the first embodiment of the present invention will be described with reference to FIG. 1 and FIG.
As shown in FIG. 1, a drop closure 10 (drop closure according to an embodiment of the present invention) used in the method for easily extending the number of cable leads according to the present embodiment includes a cylindrical sleeve 11 and left and right end surface portions 12. ₁ , 12 ₂ , connecting bracket 13, left and right cable gripping brackets 14 ₁ , 14 ₂ , left and right suspension brackets 15 ₁ , 15 ₂ , retaining bracket 16, and first and second packings 17 _1. , 17 ₂ (see FIG. 2) and left and right side metal fittings 18 ₁ , 18 ₂ .

The sleeve 11 is made of a resin such as weather-resistant polyethylene, and is used to form an accommodation space for accommodating the fusion tray 21 and the optical coupler tray 22 inside the drop closure 10. Further, the sleeve 11, as shown in FIG. 2, ₁ first and second downwardly extending portion 11 which is projected vertically in the central portion of the bottom surface, 11 comprises _two, first and second hanging portion 11 _1, 11 ₂ can be opened and closed.

The cable extension simple extension method according to this embodiment is characterized in that the extension optical drop cable 1 is sandwiched between the first and second hanging parts 11 ₁ and 11 ₂ of the sleeve 11 and pulled out from the drop closure 10.
Therefore, in order to prevent damage to the additional optical drop cable 1, and when the additional optical drop cable 1 is drawn into the drop closure 10 in which the core of the existing optical drop cable having low water resistance is exposed, rainwater, etc. In order to take a waterproof measure so as not to enter the drop closure 10 due to capillarity, the first and second packings 17 ₁ and 17 ₂ made of rubber are connected to the first and second sleeves 11 by double-sided tape, for example. Are attached to the drooping portions 11 ₁ and 11 ₂ , respectively.

The first and second hanging parts 11 ₁ , 11 ₂ and the first and second packings 17 ₁ , 17 ₂ have four through-holes (four through holes for allowing the four fastening bolts 19 to pass through, respectively). (Not shown) are formed at regular intervals along the longitudinal direction (axial direction) of the sleeve 11. Thus, after passing the four fastening bolts 19 through these through holes, the first and second hanging parts 11 ₁ , 11 ₂ and the first and second packings 17 ₁ , 17 ₂ is tightened from both sides so that the additional optical drop cable 1 is sandwiched and fixed, and the accommodation space in the drop closure 10 is sealed in a watertight and airtight manner (see FIG. 2).

The left and right end surface portions 12 ₁ and 12 ₂ are for closing both ends of the drop closure 10 in the longitudinal direction. One optical cable inlet (not shown) for introducing the access optical cable into the drop closure 10 is formed at the center of the left and right end surface portions 12 ₁ , 12 _2. A plurality of existing optical drop cable inlets (not shown) for introducing a plurality of existing optical drop cables into the drop closure 10 are formed in the upper portions of the end surface portions 12 ₁ and 12 ₂ .

The connection fitting 13 is for fixing the fusion tray 21 and the optical coupler tray 22 in the drop closure 10, and both ends of the connection fitting 13 are fixed to the left and right end surface portions 12 ₁ and 12 ₂ , respectively. .

The left and right cable gripping brackets 14 ₁ and 14 ₂ are for gripping and fixing the access system optical cable introduced into the drop closure 10 through the optical cable introduction ports of the left and right end surface portions 12 ₁ and 12 _2. It is.

The fusion tray 21 is for fusing and connecting the core of the access optical cable and the core of the existing optical drop cable.
In the optical coupler tray 22, when the number of optical drop cables drawn out reaches the limit in the drop closure 10 (that is, the existing optical drop cables are connected from all the existing optical drop cable inlets on the left and right end faces 12 ₁ and 12 ₂ ). When the optical fiber is pulled out), one optical fiber of the access system optical cable (not shown) installed in the optical coupler tray 22 is branched into 32 from one optical fiber of the access system optical cable, and a maximum of 32 additional optical drop cables can be connected. By connecting each with a core wire, a maximum of 32 additional optical drop cables can be pulled out from the drop closure 10.

The left and right suspension brackets 15 ₁ and 15 ₂ are for hanging and fixing the drop closure 10 on a suspension line (not shown) installed between two utility poles (supports). The left and right suspension brackets 15 ₁ and 15 ₂ are attached to the upper outer portions of the left and right end surface portions 12 ₁ and 12 ₂ via support bars, respectively.

The retainer 16 is made of a metal plate (for example, a stainless steel plate) in which 32 holes equal in number to the maximum number (= 32) of additional optical drop cables are formed in a line along the longitudinal direction of the drop closure 10. The both ends are fixed to the left and right cable gripping fittings 14 ₁ , 14 ₂ , respectively, so that they are provided below the connecting fitting 13 in the accommodating space of the drop closure 10 (on the bottom side of the sleeve 11). It has been.

The simple method of extending the number of cable leads according to the present embodiment is to drop the extension optical drop cable 1 by passing the support wire 3 of the extension optical drop cable 1 through the hole of the retention fitting 16 and winding it around the retention fitting 16 one or more times. 10 is characterized by the point of support.
The reason why the retaining metal fitting 16 is provided in the drop closure 10 is as follows.
Generally, when an optical drop cable with a core wire and a support wire (steel wire) is drawn into the drop closure, the core wire and the support wire are separated from the outside of the drop closure and the separated support wire is retained. Thus, only the core wire is drawn into the drop closure. However, in the case where the support line is retained outside the drop closure as described above, if the number of core wires is increased, the retained portion of the support line is congested, which causes troubles during the removal work. Therefore, in the simple method of extending the number of cable leads according to the present embodiment, when the extension optical drop cable 1 is drawn into the drop closure 10, the extension optical drop cable 1 is dropped without separating the core 2 and the support line 3. The core wire 2 and the support wire 3 are separated from each other in the closure 10, and the support wire 3 is wound around the retainer 16 by winding the separated support wire 3 around the retainer 16.

The left and right receiving metal fittings 18 ₁ , 18 ₂ are fixed to the support rods of the left and right hanging metal fittings 15 ₁ , 15 ₂ , respectively, so that the left and right end surface parts 12 ₁ , 12 ₂ of the drop closure 10 It is attached between the left and right hanging brackets 15 ₁ and 15 ₂ . A through hole for passing an additional optical drop cable drawn from between the first and second hanging parts 11 ₁ , 11 ₂ of the sleeve 11 is provided at the other end of the left and right receiving brackets 18 ₁ , 18 _2. (Not shown) is formed along the longitudinal direction of the drop closure 10. The material of the left and right receiving brackets 18 ₁ and 18 ₂ is stainless steel that is resistant to rust.

The cable extension simple extension method according to the present embodiment is characterized in that the extension optical drop cable 1 is received through the through holes of the right and left receiving brackets 18 ₁ and 18 ₂ and then drawn into the drop closure 10.
The reason why the additional optical drop cable 1 is received by the right side or left side metal fittings 18 ₁ , 18 ₂ is as follows.
If the extension optical drop cable 1 is directly drawn into the drop closure 10, the downward tension is directly applied to the retainer 16 around which the support wire 3 of the extension optical drop cable 1 is drawn. When tension is applied, the additional optical drop cable 1 is detached from the drop closure 10. Therefore, the extension optical drop cable 1 is received by the right or left receiving metal fittings 18 ₁ , 18 ₂ and then drawn into the drop closure 10, thereby preventing downward tension from being directly applied to the retainer 16.

Next, the operation procedure in the cable extension simple extension method according to this embodiment will be described by taking as an example the case where the extension optical drop cable 1 shown in FIG. 1 is drawn into the drop closure 10.
The operator removes all the four fastening bolts 19 and pulls the first and second hanging parts 11 ₁ and 11 ₂ of the sleeve 11 left and right to open and remove the sleeve 11.
Thereafter, the operator passes the additional optical drop cable 1 through the through hole of the left-side metal fitting 18 ₁ , and then separates the core wire 2 and the support wire 3 at the tip of the additional optical drop cable 1. The operator winds the separated support wire 3 through the hole of the retaining metal 16 one or more times and connects the separated core wire 2 to the optical coupler in the optical coupler tray 22.
Thereafter, the worker attaches the sleeve 11 so that the extension optical drop cable 1 is sandwiched between the first and second packings 17 ₁ and 17 ₂ , and then attaches the four fastening bolts 19 to the first and second hanging parts. After passing through the through holes 11 ₁ , 11 _{2 and} the through holes of the first and second packings 17 ₁ , 17 ₂ , the first and second parts are constituted by four fastening bolts 19 and four fastening nuts 20. The sleeve 11 is fixed by tightening the hanging parts 11 ₁ , 11 ₂ and the first and second packings 17 ₁ , 17 ₂ .

  In the simple method for extending the number of cable leads according to the present embodiment, the drop closure 10 can be configured with the same size as the conventional drop closure, so that the drop closure is not significantly increased in size. Further, even after the drop closure 10 is installed, a maximum of 32 additional optical drop cables 1 can be drawn into the drop closure 10, so that the number of optical drop cables drawn out can be increased even after the drop closure 10 is installed. .

In the above description, the retainer 16 made of a metal plate with 32 holes formed is used. However, the retainer made of a metal plate with no holes formed, or 32 on both side surfaces. You may use the retaining metal fixture comprised from the metal plate in which the recessed part was formed.
In addition, although a maximum of 32 additional optical drop cables can be pulled out, for example, a maximum of 12 additional optical drop cables may be pulled out. In this case, the number of holes in the retaining metal 16 may be twelve.

Next, a description will be given of a simple method for extending the number of cable leads according to the second embodiment of the present invention.
The cable extension simple extension method according to this embodiment is based on the left and right end surfaces of the existing drop closure so that the extension optical drop cable can be pulled out from the existing drop closure after the number of existing drop closures reaches the limit. The left and right extension end face portions in which the left and right extension optical drop cable inlets for introducing the extension optical drop cable into the existing drop closure are formed are attached to the outer periphery of the optical fiber.

Hereinafter, with respect to the simple method of extending the number of cable leads according to the present embodiment, in the existing drop closure 110 shown in FIG. 3 (a), the left and right existing installations provided on the left and right end surface portions 112 ₁ and 112 _{2 respectively.} An example in which the additional optical drop cable can be pulled out from the existing drop closure 110 after the existing optical drop cable is pulled out from all of the optical drop cable inlets 134 ₁ and 134 ₂ will be described.

The existing drop closure 110 includes a cylindrical sleeve 111, left and right end surface portions 112 ₁ and 112 ₂ , a connecting metal fitting 113 (see FIG. 3B), and left and right cable holding metal fittings 114 ₁ and 114 ₂ ( (Not shown) and left and right hanging brackets 115 ₁ and 115 ₂ (not shown).

Similar to the sleeve 11 of the drop closure 10 shown in FIG. 1, the sleeve 111 includes first and second drooping portions 111 ₁ and 111 ₂ protruding vertically at the center of the bottom surface, and the first and second The hanging portions 111 ₁ and 111 ₂ can be opened and closed.
The first and second hanging parts 111 ₁ , 111 ₂ have four through holes (not shown) for passing through four fastening bolts (not shown) along the longitudinal direction of the sleeve 111. Are formed at regular intervals. As a result, after passing four fastening bolts through these through holes, the first and second drooping portions 111 ₁ and 111 ₂ are tightened from both side surfaces together with four fastening nuts (not shown). The accommodation space in 110 is sealed in a watertight and airtight manner.

As shown in FIG. 4A, the left end surface portion 112 ₁ has a left waterproof packing provided between the two left end surface plates 131 ₁₁ and 131 ₁₂ and the two left end surface plates 131 ₁₁ and 131 _12. 132 ₁ . Incidentally, the left side waterproof packing 132 ₁ is an annular access optical cable, the installed optical drop cable and left bolts 135 ₁ in order to penetrate. The right end surface portion 112 ₂ is configured similarly to the left end surface portion 112 ₁ .
An access optical cable is introduced into the drop closure 110 at the central portion of the left end plate 131 ₁₁ , 131 ₁₂ of the left end surface portion 112 ₁ and the central portion of the right end plate 131 ₂₁ , 131 ₂₂ of the right end surface portion 112 _2. The left and right optical cable inlets 133 ₁ and 133 ₂ are formed one by one (see FIG. 3B).
Also, a total of 32 existing optical drop cables are dropped on the upper and lower sides of the left end face plates 131 ₁₁ and 131 ₁₂ of the left end face portion 112 ₁ and the upper and lower sides of the right end face plates 131 ₂₁ and 131 ₂₂ of the right end face portion 112 _2. Eight left-side and right-side existing optical drop cable inlets 134 ₁ and 134 ₂ for introduction into the closure 110 are formed (see FIG. 3B).
Further, a left end face 112 ₁ of the left end surface plate 131 _11, 131 ₁₂ of left optical cable inlet 133 ₁ above the right end surface 112 _{and second} right-side end face plate 131 _21, 131 ₂₂ right optical cable inlet 133 ₂ of the above the left and right nuts 136 _1, 136 ₂ with the left and right end surface plate 131 _11, 131 _12, 131 _21, 131 ₂₂ left and right waterproof packing 132 ₁ by tightening each from both sides, 132 ₂ compression, respectively Thus, through holes for penetrating the left and right bolts 135 ₁ and 135 ₂ for sealing both ends of the existing drop closure 110 in a watertight and airtight manner are formed.

The connecting metal 113, the left and right cable holding metal pieces 114 ₁ and 114 ₂ and the left and right hanging metal fittings 115 ₁ and 115 ₂ are the same as the connecting metal 13 and the left and right cable holding metal parts 14 ₁ and 14 ₂ shown in FIG. The left and right hanging brackets 15 ₁ and 15 ₂ are configured in the same manner.

Next, with reference to FIGS. 5 and 6, the left and right extension end face portions 150 ₁ and 150 ₂ and the extension sleeve 171 used to allow the extension optical drop cable to be pulled out from the existing drop closure 110 will be described. explain.

Left for expansion end face 150 _1, as shown in FIG. 5 (a), and two annular left for expansion the end plate 151 _11, 151 _12, two left for expansion the end plate 151 _11, 151 ₁₂ ; and a waterproof packing 152 ₁ for left-side additional annular provided between.
The left extension end plates 151 ₁₁ , 151 ₁₂ are provided with two left extension droops 153 ₁₁ , 153 ₁₂ projecting vertically at the center of the bottom, and can be opened and closed by the left extension droops 153 ₁₁ , 153 ₁₂ . It is said that. As shown in FIG. 5 (b), a hole for inserting a left-side extension fastening bolt 161 ₁ and a left-side extension fastening nut 162 ₁ is formed in the center of the left-side extension hanging parts 153 ₁₁ and 153 ₁₂ . When a through hole for passing the fastening bolts 161 ₁ for left-side extension is formed. As a result, after the left extension end face 150 ₁ is placed on the left end face 112 ₁ , the left extension fastening bolt 161 ₁ and the left extension fastening nut 162 ₁ are used to attach the left extension droops 153 ₁ and 153 ₂ from both sides. by tightening, it can be attached to the left for expansion end face 150 ₁ in the left end face 112 _1.
In addition, a total of 16 additional optical drop cables are installed on the upper and lower sides of the left side extension end plates 151 ₁₁ and 151 ₁₂ and the left side extension waterproof packing 152 _{1 on} the left side extension end portion 150 ₁ in total. each left extension beam drop cable inlet 154 ₁ for introducing is formed by eight to.
Additionally, the left extension end face plate 151 _11, 151 to the the ₁₂ corners of the four corners and left for expansion waterproof packing 152 _1, four left extension nut 156 ₁ left for expansion end plates 151 ₁₁ with (not shown), The left extension waterproofing packing 152 ₁ is compressed by tightening 151 ₁₂ from both sides, and four left extension bolts 155 ₁ for sealing the left end of the existing drop closure 110 in a watertight and airtight manner are respectively inserted. For this purpose, a through hole is formed.
Right for expansion end surface ₁₅₀₂ is also configured similarly to the left for expansion end surface 150 _1.

Since the extension sleeve 171 has the left and right extension end face portions 150 ₁ and 150 ₂ attached to the left and right end face portions 112 ₁ and 112 ₂ , the size of the end face portion is slightly larger. This is used instead of the sleeve 111 shown in FIG.
As shown in FIG. 6, the expansion sleeve 171 includes first and second expansion droops 171 ₁ and 171 ₂ that protrude vertically in two steps at the center of the bottom surface. It can be opened and closed by extension hanging parts 171 ₁ , 171 ₂ . Although not shown, the first and second extension hanging parts 171 ₁ , 171 ₂ have four fastening bolts in the same manner as the first and second hanging parts 111 ₁ , 111 ₂ of the sleeve 111. Are formed at regular intervals along the longitudinal direction of the expansion sleeve 171. As a result, after passing four fastening bolts through these through holes, the first and second extension hanging parts 171 ₁ , 171 ₂ are tightened from both sides together with the four fastening nuts, and the inside of the existing drop closure 110. The housing space is sealed in a watertight and airtight manner.

Next, the work procedure in the simple method for extending the number of cable leads according to the present embodiment will be described with reference to FIGS.
After removing the sleeve 111 of the existing drop closure 110 (see FIGS. 3A and 3B), the operator turns the left and right bolts 135 ₁ and 135 ₂ of the left and right end surfaces 112 ₁ and 112 _2. Then, the left and right waterproof packings 132 ₁ and 132 ₂ are loosened respectively (see FIGS. 4A and 4B).

Thereafter, the operator attaches the left and right extension end face portions 150 ₁ , 150 ₂ to the outer periphery of the left and right end face portions 112 ₁ , 112 ₂ of the existing drop closure 110, respectively, and then the left and right extension fastening bolts 161. ₁ , 161 ₂ and left and right extension fastening nuts 162 ₁ , 162 ₂ are used to tighten left and right extension hanging parts 153 ₁₁ , 153 ₁₂ , 153 ₂₁ , and 153 ₂₂ from both sides (FIG. 5B). The left and right extension end face portions 150 ₁ and 150 ₂ are fixed to the outer circumferences of the left and right end face portions 112 ₁ and 112 ₂ of the existing drop closure 110, respectively.

Then, the operator tightens respectively from the left and right end face 112 _1, 112 ₂ of the left and right bolts 135 _1, 135 left and right waterproof packing 132 _{1 2} Turn, 132 ₂ both sides of the existing drop closure 110 As a result, the left and right end face portions 112 ₁ and 112 ₂ and the left and right extension end face portions 150 ₁ and 150 ₂ are brought into close contact with each other.

Thereafter, the operator, after retracted from extension Optical Drop Cable left or right add-on end of the core wire surface portion 150 _1, 150 ₂ of the left or right extension Optical Drop Cable inlet 154 _1, 154 _2, retracted extension light Connect the core of the drop cable to the optical coupler. At this time, the support line of the extension optical drop cable is fixed to, for example, the left or right hanging brackets 115 ₁ and 115 ₂ .

After that, the worker puts on the expansion sleeve 171 (see FIG. 6), and the first and second expansions of the expansion sleeve 171 with four additional fastening bolts and four additional fastening nuts. The extension sleeves 171 are fixed by tightening the hanging parts 171 ₁ and 171 ₂ from both sides.

Thereafter, the operator, the left and right extension for end face 150 _1, 150 ₂ of the left and right extension bolt 155 in the four corners _1, 155 _{1 2} and the left and right extension nuts 156, 156 ₂ and the left and right extension in The end face plates 151 ₁₁ , 151 ₁₂ , 151 ₂₁ , 151 ₂₂ are tightened from both sides to compress the left and right additional waterproof packings 152 ₁ , 152 ₂ , respectively, and the left and right additional end face parts 150 ₁ , 150 ₂ The expansion sleeve 171 is closely attached.

  In the above description, a maximum of 32 additional optical drop cables can be pulled out. However, for example, a maximum of 12 additional optical drop cables may be pulled out.

It is a figure which shows the structure of the drop closure 10 used in the cable lead-out simple extension method by the 1st Example of this invention. It is a figure which shows the structure of the sleeve 11 shown in FIG. It is a figure which shows the structure of the existing drop closure 110 used in the cable drawer number simple extension method by 2nd Example of this invention. It is a diagram showing a left end face 112 ₁ of the configuration of the existing drop closure 110 shown in FIG. Is a diagram showing the left side of the add-on end face 150 ₁ configured for use in a cable lead-out number Simple expansion method according to the second embodiment of the present invention. It is a figure which shows the structure of the sleeve 171 for extension used in the cable lead-out number simple extension method by 2nd Example of this invention.

Explanation of symbols

1 additional optical drop cable 2 core 3 support wire 10 drop closure 11, 111 sleeve 11 _1, 11 _2, 111 _1, 111 ₂ first and second hanging portions 12 _1, 12 _2, 112 _1, 112 ₂ left and right end face 13, 113 connecting member 14 _1, 14 _2, 114 _1, 114 ₂ left and right cable clamping hardware 15 _1, 15 _2, 115 _1, 115 ₂ left and right hanger 16 anchor bracket 17 _1, 17 ₂ a 1st and 2nd packings 18 ₁ , 18 ₂ Left and right side receiving brackets 19 Fastening bolt 20 Fastening nut 21 Fusing tray 22 Optical coupler tray 110 Existing drop closures 131 ₁₁ , 131 ₁₂ , 131 ₂₁ , 131 ₂₂ Left and right end plates 132 ₁ , 132 ₂ Left and right waterproof packing 133 ₁ , 133 ₂ Left and right optical cable inlet 134 _1, 134 ₂ left and right installed optical drop cable inlet 135 _1, 135 ₂ left and right bolts 136 _1, 136 ₂ left and right nuts 150 _1, 150 ₂ left and right extension for end surface 151 _11, 151 _12, 151 _21, 151 ₂₂ left and right extension end face plates 152 _1, 152 ₂ left and waterproof packing for the right extension 153 _11, 153 _12, 153 _21, 153 ₂₂ left and right extension pendent portion 154 _1, 154 ₂ left and right extension Optical drop cable inlets 155 ₁ , 155 ₂ Left and right side extension bolts 156 ₁ , 156 ₂ Left side and right side extension nuts 161 ₁ , 161 ₂ Left side and right side extension fastening bolts 162 ₁ , 162 ₂ Left side and right side extension bolts Nut 171 Expansion sleeve 171 ₁ , 171 ₂ First and second expansion hanging parts

Claims (10)

After the number of pull-outs of the drop closure (10) including the sleeve (11) having the first and second hanging parts (11 ₁ , 11 ₂ ) formed on the bottom surface reaches the limit, the additional optical drop is dropped from the drop closure It is a simple method for extending the number of cable drawers so that the cable (1) can be pulled out.
A method for easily extending the number of cable leads, wherein the additional optical drop cable is sandwiched between the first and second hanging portions of the sleeve and pulled out from the drop closure. Rubber first and second packings (17 ₁ , 17 ₂ ) are attached to the first and second hanging parts of the sleeve, and the additional optical drop cable is connected to the first and second of the sleeve. 2. The number of cable drawers according to claim 1, wherein the additional optical drop cable is prevented from being damaged when being pulled out from the drop closure by being sandwiched by the hanging part of the cable and waterproof measures for the drop closure are taken. Expansion method. Separating the core (2) and the support (3) of the additional optical drop cable drawn into the drop closure;
The separated support wire is fastened to a retaining metal fitting (16) attached in the drop closure, and the additional optical drop cable is supported by the drop closure,
The method for easily increasing the number of cable leads according to claim 1 or 2. Attached to the outside of the drop closure are receiving brackets (18 ₁ , 18 ₂ ) having through holes formed along the longitudinal direction of the drop closure,
After the additional optical drop cable is received through the through hole of the receiving metal fitting, it is pulled into the drop closure,
The method for easily increasing the number of cable leads according to any one of claims 1 to 3. A cable extension simple extension method for allowing an additional optical drop cable to be pulled out from the existing drop closure after the number of existing drop closures (110) reaches the limit,
On the outer periphery of the left and right end face portions (112 ₁ , 112 ₂ ) of the existing drop closure, left and right additional optical drop cable inlets (154 ₁ , 154 ₁ , 154) for introducing the additional optical drop cable into the existing drop closure 154 ₂ ) The left and right extension end face portions (150 ₁ , 150 ₂ ) formed with the cable are attached, and the cable extension number simple extension method is provided. The left and right extension end face portions are respectively disposed between two annular left and right extension end face plates (151 ₁₁ , 151 ₁₂ ; 151 ₂₁ , 151 ₂₂ ) and the two left and right extension end face plates, respectively. Provided with left and right waterproof packings (152 ₁ , 152 ₂ ),
After attaching the left and right extension end face portions to the outer periphery of the left and right end face portions, an extension sleeve (171) is fixed to the existing drop closure,
At the four corners of the left and right extension end faces, the left and right extension end plates are placed on both sides with left and right extension bolts (155 ₁ , 155 ₂ ) and left and right extension nuts (156 ₁ , 156 ₂ ). The left and right extension waterproof packings are compressed by the left and right extension end plates, respectively, and the left and right extension end faces are in close contact with the left and right extension end faces and the extension sleeve. Let
6. The method for easily adding cables according to claim 5, wherein: After the number of pull-outs of the drop closure (10) including the sleeve (11) having the first and second hanging parts (11 ₁ , 11 ₂ ) formed on the bottom surface reaches the limit, the additional optical drop is dropped from the drop closure A drop closure that allows the cable (1) to be pulled out,
For attaching the extension optical drop cable to the drop closure by attaching the support line (3) of the extension optical drop cable attached to the accommodation space formed inside the drop closure by the sleeve. A retaining bracket (16) is provided.
Sandwiching the additional optical drop cable between the first and second hanging parts of the sleeve and pulling it out from the drop closure;
Drop closure characterized by that. And further comprising rubber first and second packings (17 ₁ , 17 ₂ ) attached to the first and second hanging parts of the sleeve, respectively.
When the additional optical drop cable is sandwiched between the first and second hanging portions of the sleeve and pulled out from the drop closure, the additional optical drop cable is prevented from being damaged and measures against waterproofing of the drop closure are taken. ,
The drop closure according to claim 7, wherein: And further comprising receiving brackets (18 ₁ , 18 ₂ ) attached to the outside of the drop closure and having through holes formed along the longitudinal direction of the drop closure,
After the additional optical drop cable is received through the through hole of the receiving metal fitting, it is pulled into the drop closure,
The drop closure according to claim 7 or 8, characterized in that. A number of holes equal to the maximum number of additional optical drop cables to be drawn into the drop closure are formed in a line along the longitudinal direction of the drop closure,
The support line of the additional optical drop cable is passed through the hole of the retaining metal fitting and wound around the retaining metal part, and is retained.
The drop closure according to any one of claims 7 to 9, characterized in that.

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