JP2010008771A - Cable lead-in section structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable lead-in section structure capable of easily protecting a section susceptible to damage by birds and preventing breakage of core cables due to damage by birds in a reliable fashion. <P>SOLUTION: A protection part 100 is furnished for protecting the surface of a section of a cable that is a branch point when the cable is led-in, by attaching a removable clamp cover 101 to a spaced section between a cable connection closure 20 having a sleeve in which cable connection portions are accommodated, and a spiral hanger 21 spirally wound on the surface of the cable 4 disposed spaced from the cable connection closure 20 by a predetermined interval. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a cable lead-in portion, and is particularly useful when applied to a lead-in portion of FTTH (Fiber To The Home).

  Traditionally, in order to provide services related to lifelines such as electricity and the Internet network at electric power companies, etc., the cable installed in the aerial via a utility pole has been drawn into the contractor's facility, etc. A lifeline environment such as electricity and the Internet network is established for each contractor by laying one drop cable (lead-in wire) individually branched from the cable connection closure attached to the cable.

  In carrying out the above-described work, for example, various arrangements such as laying out a cable so that tension is not applied to the core of the cable, or bundling the main part of the cable laid using a spiral hanger, etc. Ingenuity has been made.

  Further, as a structure for suppressing damage to the cable core, an optical fiber cable connection structure and a connection closure (see Patent Document 1) have been proposed. On the other hand, an optical fiber cable fixing structure and fixing method (see Patent Document 2) and the like have been proposed as a structure for preventing the connection of the cable core wires.

  None of the above-mentioned structures is intended to protect the core wire that is the core of the lifeline, but it could not be applied in part to countermeasures against losses such as failures that have been known to some extent, such as bird damage. .

JP 2005-195784 A (Claims etc.) JP 2007-41014 A (Claims etc.)

  In view of such circumstances, the present invention provides a structure of a cable lead-in portion that can easily protect a part that is easily affected by bird damage and can reliably prevent disconnection of a core wire caused by bird damage. Objective.

  In order to achieve the above object, a first aspect of the present invention includes a cable connection closure having a sleeve in which a connection portion between cables is accommodated, and a predetermined distance from the cable connection closure. A detachable clamp cover is attached to a part separated from the spiral hanger that is wound spirally on the surface of the cable, and a protection part is provided to protect the surface of the cable part that becomes a branching point at the time of retraction. It is in the structure of the cable lead-in part characterized by this.

  In the first aspect, by providing the protection portion, it is possible to reliably protect the separated portion between the cable connection closure and the spiral hanger that are easily affected by bird damage.

  According to a second aspect of the present invention, the protection portion is configured such that the draining portion formed at a separation portion from the rear end portion of the cable connection closure to the tip end portion to which the spiral hanger is attached is formed by the clamp cover. The structure of the cable lead-in portion according to the first aspect is characterized in that it is configured by being sandwiched together with a cable support line.

  In the second aspect, it is possible to reliably and easily protect a part (drainage part) that is particularly aimed at the separation part by simply attaching the clamp cover.

  According to a third aspect of the present invention, the cable is an FTTH access line, and is a drop cable drawn from an aerial to a subscriber facility. The structure of the cable lead-in portion according to the first or second aspect It is in.

  In the third aspect, since a portion susceptible to bird damage can be protected and the disconnection of the core wire due to bird damage can be surely prevented, for example, an internet network whose demand as a lifeline is increasing Can be protected from the risk of failure.

  ADVANTAGE OF THE INVENTION According to this invention, the structure of the cable drawing-in part which can protect easily the site | part which is easy to be influenced by bird damage, and can prevent the disconnection of the core wire resulting from bird damage can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

  FIG. 1 is a perspective view for explaining a laying state of a cable according to the present embodiment, and FIG. 2 is a schematic configuration diagram showing a lead-in portion of the laid cable according to the present embodiment.

  In the present embodiment, it is assumed that an optical fiber cable serving as a communication line when constructing an Internet network environment for each contractor is assumed as a cable to be laid. That is, as illustrated in FIG. 1, an FTTH (Fiber To The Home) access line is assumed as the cable 4 drawn from the overhead wiring network 1 to the individual contractor's house 2 or the like via the utility pole 3.

  The leading end 10 of the cable 4 is connected to the overhead wiring network 1 via the cable connection closure 20 and the end is connected to the leading port 30 serving as an attachment point of the contractor's house 2 (house side). It is configured by being connected.

  Here, the structure of the service port 30 serving as a branch point when the cables 4 are individually pulled into the contractor's house 2 will be specifically described with reference to FIG.

  As shown in the figure, the cable connection closure 20 having a tray in which a connection portion between the cables is accommodated is provided with a fixing member 106 that is hooked on a metal fitting portion of the support wire 105 and fixes the support wire 105 with a dedicated fixing hole. Installed. In addition, the lead-in wire 104 drawn by the branching of the cable 4 is routed through the lead-in wire retainer 102 attached to the inter-pillar lead-in wire fastener 107 with the inter-pillar lead-in wire fastener 107 installed on the support wire 105 as a base point. It is drawn in.

  2A shows a state where the clamp cover 101 constituting the protection unit 100 is not attached to the retracting portion 10, and FIG. 2B shows the state where the clamp cover 101 constituting the protection unit 100 is attached. It shows the state that has been.

  Here, in Fig.2 (a), the A part has shown the site | part which is easy to be aimed at, and the B part has shown the site | part protected by the spiral sleeve etc. FIG. Here, the clamp cover 101 that protects the surface of the cable 4 is installed in the drain part 103 of the A part.

  There is a portion corresponding to the draining portion 103 in the front portion (B portion) of the lead-in wire 104 branched to the house side (contractor's home 2) via the lead-in wire retainer 102, but the B portion is in the A portion. The slackness of the track is small and inconspicuous. For this reason, in this embodiment, it becomes an attachment object of the clamp cover 101 which comprises the protection part 100. FIG.

  In the example shown in FIG. 2B, a cable connection closure 20 and a spiral hanger 21 that is arranged at a predetermined interval from the cable connection closure 20 and spirally wound on the surface of the cable 4; By attaching the detachable clamp cover 101 to the spaced apart portion to constitute the protection unit 100, the surface of the cable portion that becomes a branching point when drawing in is protected.

  Specifically, the protection unit 100 supports the cable 4 with the clamp cover 101 on the draining portion 103 formed in the separated portion from the rear end portion of the cable connection closure 20 to the front end portion to which the spiral hanger 21 is attached. It is configured by being sandwiched together with the line 105.

  Here, the drop cable which comprises the drawing-in part 10 with respect to each contractor's house 2 is demonstrated. FIG. 3 is a cross-sectional view showing an example of a drop cable used in the lead-in portion of the laying cable according to the present embodiment.

  As shown in FIG. 3, the drop cable (cable 4) applied to the present embodiment is a single-core drop, the tension member 42 is disposed so as to sandwich the optical fiber core wire 41 in the vertical direction from both sides, and the drop cable. A support wire 43 is provided at the top of the cable, and each of these lines is covered with a sheath 44 at a time.

  Such a drop cable (cable 4) 45 and 46 is laid in an appropriately separated state or a combined state, thereby forming a branch point of the lead-in portion 10.

  Here, the clamp cover 101 which comprises the protection part 100 of the cable 4 is demonstrated. FIG. 4 is a schematic diagram illustrating an example of a clamp cover that constitutes a protection portion of the laying cable according to the present embodiment.

  FIG. 4A shows a developed view of the clamp cover 101, and FIG. 4B shows a perspective view when the clamp cover 101 is attached.

  As shown in the figure, the clamp cover 101 is provided with a hinge part 121 so that it can be bent at the center part, and is formed in a shape that is symmetric with respect to the hinge part 121. It becomes a hollow state.

  An outer edge portion 123 is provided on the outer periphery of the clamp cover 101 except for the cable insertion port 122 that forms an opening when the cable 4 is inserted. The outer edge portion 123 is formed so that either one is a convex portion and the other is a concave portion, and the cable insertion port 122 has a shape penetrating the internal space into which the cable 4 is inserted. It has become. And one outer edge part 123A can be attached by inserting | pinching the cable 4 by fitting with the other outer edge part 123B.

  The above-described clamp cover 101 may be, for example, a cover manufactured exclusively. For example, a modified cover other than the one that can accommodate the cable 4 and has a hollow inside. It may be. Thereby, it becomes possible to take measures against bird damage without incurring the cost of manufacturing a dedicated cover.

  Further, the shape of the cable insertion port 122 is not necessarily circular. For example, the hatching portion shown in FIG. 4 may be cut out and formed so as to penetrate the other end, or the cable 4 may be processed into a shape that can be easily accommodated. In this manner, the shape (hatched portion) of the cable insertion opening 122 is freely formed and processed, so that measures against bird damage are appropriately taken according to the installation environment of the cable connection closure 20 and the forming state of the drainage portion 103. It becomes possible.

  As described above, in the present embodiment, since the detachable clamp cover 101 is attached to the separated portion between the cable connection closure 20 and the spiral hanger 21 that are susceptible to bird damage, for example, It is possible to reliably and easily prevent disconnection of the core wire that occurs when a bird caught in the cable connection closure 20 strikes the cable 4 with a scissors. Thereby, for example, it is possible to protect the Internet network, which is increasingly required as a lifeline for each household, from the risk of failure due to bird damage.

It is a perspective view explaining the laying situation of the cable concerning this embodiment. It is a schematic block diagram which shows the drawing-in part of the laying cable which concerns on this embodiment. It is sectional drawing which shows an example of the drop cable used for the drawing-in part of the laying cable which concerns on this embodiment. It is the schematic which shows an example of the clamp cover which comprises the protection part of the laying cable which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Overhead wiring network 2 Contractor's house 3 Telephone pole 4 Cable 10 Lead-in part 20 Cable connection closure 21 Spiral hanger 30 Lead-in port 41 Optical fiber core wire 42 Tension member 43 Support line 44 Sheath 100 Protection part 101 Clamp cover 102 Lead-in wire retainer 103 Water drain Part 104 Lead-in wire 105 Support line 106 Fixing member 107 Inter-pillar lead-in wire clamp 121 Hinge part 122 Cable insertion port 123 (123A, 123B) Outer edge part

Claims (3)

A cable connection closure having a sleeve in which a connection portion between the cables is accommodated, and a spiral hanger spirally wound on the surface of the cable arranged at a predetermined distance from the cable connection closure The structure of the cable drawing-in part characterized by providing the protection part which attaches a detachable clamp cover to the separation | spacing site | part, and protects the surface of the cable site | part used as the branch point at the time of drawing in. The protection part is configured by sandwiching a draining part formed at a separation part from a rear end part of the cable connection closure to a tip part to which the spiral hanger is attached together with a support line of the cable with the clamp cover. The structure of the cable lead-in part according to claim 1, wherein 3. The cable lead-in structure according to claim 1, wherein the cable is an FTTH access line and is a drop cable drawn from an aerial to a subscriber facility.

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