JP4235195B2 - Optical cable traction device and method - Google Patents

Description

  The present invention relates to an optical cable pulling apparatus and method for pulling an optical cable when laying and wiring an optical cable with a connector on, for example, indoor piping.

  When laying / wiring communication cables to indoor piping, etc., tow cables, that is, laying ropes and wires in the piping to be wired in advance, and connecting the tow cables to the communication cable for laying, A communication cable is laid by winding the tow rope. At this time, as a method of connecting the traction cable and the laid communication cable, conventionally, a traction tool called a cable grip is put on the communication cable and fixed with a wire or the like so as not to come off. Further, since the towing rope returns when towing, the turning back is connected. This method is mainly used when laying underground wiring cables having a large mass and a long pulling distance. On the other hand, optical fiber cables installed indoors are light, thin, and short, unlike underground cables, so do not use cable grips or other tendering tools, and lay the cables directly by connecting the communication cable and the towing cable. This is the current situation. Furthermore, when laying communication cables with connectors preinstalled at both ends indoors, a method of protecting the connector part with a flexible cylindrical object and pulling the cylindrical object, or a connector There is a method in which a connector is fixed to a tension member in an attached cable, and the tension member is pulled (for example, see Patent Document 1).

JP 2000-241692 A

  In the conventional method, the configuration of the connecting portion between the tow rope and the towing tool is a cable end, a pooling eye, a turnback, a towing rope eye, and a towing rope. In this configuration, when laying a communication cable in the pipe, the tow rope eye, turn back, and pooling eye are exposed, and it is hung on the uneven part of the pipe and the bent part, making it difficult to pull. There is a case. In the case of a cable with a connector, the connector part may be damaged due to being caught. In addition, the articles from the pulling end to turning back are individual articles, and it takes time to attach them separately.

  The present invention has been made in view of the above circumstances, and a connector connecting portion for connecting to a connector of an optical cable is provided with a tow rope attachment portion to which a tow rope is attached, so that the connector of the optical cable can be rotated. It is an object of the present invention to provide an optical cable pulling device and method that can simplify attachment and detachment of a tow rope and can provide a turn-back function, and can improve workability of laying and wiring work of an optical cable with a connector.

  To achieve the above object, the present invention provides an optical cable pulling device for pulling an optical cable when wiring an optical cable with a connector, a connector connecting portion for connecting to a connector attached to one end of the optical cable, The connector connecting portion includes a tow rope attachment portion that is rotatably provided and to which a tow rope is attached.

  The optical cable pulling device of the present invention is characterized in that the pulling rope side end of the connector connecting portion and the pulling rope side end of the pulling rope mounting portion are each formed in a curved shape.

  The optical cable pulling device of the present invention is characterized in that a slit groove is provided in the pulling direction on the outer surface of the connector connecting portion.

  The optical cable pulling method of the present invention uses the optical cable pulling device, attaches the pulling rope to the pulling rope attaching portion, attaches the cable grip to the pulling rope attaching portion and the pulling rope, and then attaches the optical cable to the connector connecting portion. After the connector is connected, the cable grip covers the tow rope attachment portion, the connector connection portion, and the connector of the optical cable, and then the optical cable is pulled by the tow rope.

  The optical cable pulling apparatus and method according to the present invention includes a connector connecting portion for connecting to a connector of an optical cable, and a pulling rope attaching portion to which the pulling rope is attached is provided rotatably, so that the optical cable connector and the pulling rope can be attached and detached. Can be simplified, and a turn-back function can be provided, and the workability of laying and wiring work of an optical cable with a connector can be improved.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1A is an exploded front view showing an optical cable pulling device according to an embodiment of the present invention, and FIG. 1B is an exploded plan view showing an optical cable pulling device according to an embodiment of the present invention. As shown in FIGS. 1A and 1B, an SC (Single Fiber Coupling) connector 11 attached to one end of an optical cable constituting an optical cable with a connector is gripped with respect to a connector main body 13 including a locking projection 12. 14 can slide in the axial direction. A ferrule 15 projects from the tip center shaft of the connector body 13. The connector connecting portion 16 for connecting to the SC connector 11 is configured in the same manner as the SC adapter, and a locking piece (not shown) is provided in the recess at one end of the connector connecting portion 16 into which the SC connector 11 is inserted. It is done. A swivel-type joint fitting 17 is attached to the other end of the connector connecting portion 16, and a tow rope attachment portion 18 is rotatably attached to the joint fitting 17 to integrate the turning back. A tow rope such as a rope or a wire is attached to the tow rope attachment portion 18. The tow rope side end of the connector connecting portion 16 and the tow rope side end of the tow rope mounting portion 18 are each formed in a curved shape such as an arc shape, for example.

  FIG. 2 is a plan view for explaining the optical cable pulling method according to the embodiment of the present invention. As shown in FIG. 2, the optical cable traction device shown in FIGS. 1A and 1B is used to attach a traction rope 21 to the traction rope attachment 18 and, for example, steel to the traction rope attachment 18 and the traction rope 21. A cable grip 22 having a mesh structure made of braided wires is attached. The cable grip 22 is attached to the tow rope 21 with a wire 23. Then, after the SC connector 11 of the optical cable 24 is connected to the connector connecting portion 16, the cable grip 22 covers the SC connector 11 of the tow rope mounting portion 18 and the connector connecting portion 16 and the optical cable 24, and then covers the tow cord. 21 pulls the optical cable with connector into the pipe. As described above, the cable grip 22 covers the SC connector 11 of the optical cable 24 by covering the tow rope mounting portion 18 and the connector connecting portion 16, thereby eliminating the projection portion that may be caught in the conduit to be wired. . Further, the cable grip 22 does not need to be subjected to a traction force, and hence it is not necessary to fix the cable grip 22 to the optical cable 24 to be pulled.

  The SC connector 11 is inserted / removed by operating the knob 14. That is, when the SC connector 11 is inserted so that the ferrule 15 is housed in the concave portion of the connector connecting portion 16, the locking protrusion 12 of the SC connector 11 is coupled to the locking piece of the connector connecting portion 16, and the SC connector 11 is Locked. When the SC connector 11 is pulled out, if the knob 14 is pulled backward, the locking piece of the connector connecting portion 16 is expanded by the movement of the knob 14, the lock is released, and the SC connector 11 is pulled out.

  Further, the cable grip 22 does not need to grip the cable and cover the traction tension as compared with the conventional one used for cable traction, reduces friction with the inner wall of the pipe, and the tow rope mounting portion 18, connector connection portion 16, The material and shape may mainly be the protection of the SC connector 11, and may be a cable grip made of a flexible rubber tube or chemical fiber, for example.

  Further, the tow rope mounting portion 18 integrates the turning back and separates the tow rope mounting portion 18 and the connector connecting portion 16 so that the twist generated during wiring can be eliminated at any time by the rotation of the towing rope mounting portion 18. Are connected by a swivel-type joint fitting 17.

  Furthermore, the friction with the inner wall of the pipe is reduced by forming the tow rope side end of the connector connecting portion 16 and the tow rope side end of the tow rope mounting portion 18 in a curved shape such as an arc shape, for example.

  Further, by making the inside of the connector connecting portion 16 the same structure as the SC adapter, the SC connector 11 can be easily attached and detached by being inserted into the connector connecting portion 16 and can be prevented from being damaged during towing.

  FIGS. 3A, 3B, and 3C are a front view, a plan view, and a side view for explaining a connector connecting portion according to another embodiment of the present invention. As shown in FIGS. 3A, 3 </ b> B, and 3 </ b> C, a plurality of slit grooves 32 are provided in the pulling direction on the outer peripheral surface of the connector connecting portion 31. Thus, by providing the slit groove 32, the contact area between the inner wall of the pipe and the connector connecting portion 31 can be reduced and the frictional force can be reduced during towing.

  As described above, by inserting the SC connector into the connector connection portion, forming the tow rope side end portion of the connector connection portion and the tow rope side end portion of the tow rope mounting portion in a curved shape, and further covering the cable grip, The tension during towing can be reduced, and the possibility of damaging the SC connector during towing is reduced. Further, since the SC connector of the optical cable to be pulled after assembling the connector connecting portion, the towing rope, and the cable grip is connected to the connector connecting portion, the attachment / detachment is easy and the time is shortened. Furthermore, since the ferrule part of the SC connector of the optical cable is accommodated in the connector connection part, the tip end surface of the SC connector including the ferrule can be protected. Further, by using the optical cable pulling device in which the pulling cable mounting part is rotatably attached to the connector connecting part, the mounting of the SC connector and the pulling cable can be simplified, and the workability of the optical cable pulling can be improved.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiment examples may be appropriately combined.

(A), (b) is the decomposition | disassembly front view and decomposition | disassembly top view which show the optical cable pulling apparatus based on the embodiment of this invention. It is a top view for demonstrating the optical cable pulling method which concerns on the embodiment of this invention. (A), (b), (c) is the front view, top view, and side view for demonstrating the connector connection part which concerns on the other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... SC connector, 12 ... Locking protrusion, 13 ... Connector main body, 14 ... Knob, 15 ... Ferrule, 16 ... Connector connection part, 17 ... Swivel type joint metal fitting, 18 ... Towing rope attachment part

Claims (4)

An optical cable pulling device for pulling an optical cable when wiring an optical cable with an SC connector,
A connector connecting portion provided with a locking piece in a recess at one end for connecting to an SC connector having a locking projection and an axially slidable knob attached to one end of the optical cable;
The connector connecting portion is provided rotatably and includes a tow rope mounting portion to which a tow rope is attached ,
When the SC connector is inserted into the concave portion of the connector connecting portion, the SC connector locking projection is coupled to the connector connecting portion locking piece, the SC connector is locked, and the SC connector knob is pulled backward. An optical cable pulling device characterized in that the locking piece of the connector connecting portion spreads by the movement of the knob, the lock is released, and the SC connector is pulled out .   The optical cable pulling device according to claim 1, wherein the tow rope side end of the connector connecting portion and the tow rope side end of the tow rope mounting portion are each formed in a curved shape.   The optical cable pulling device according to claim 1, wherein a slit groove is provided in an pulling direction on an outer surface of the connector connecting portion. The optical cable pulling device according to any one of claims 1 to 3, wherein a pulling rope is attached to the pulling rope attaching portion, a cable grip is attached to the pulling rope attaching portion and the pulling rope, and then the optical cable is attached to the connector connecting portion. after connecting the SC connector, the rear cable grips over said tow mounting portion and the connector connection portion and an optical cable of SC connectors, cable pulling method characterized by pulling the optical cable by tow.

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