JP2010231047A - Traction end part for cable with connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently draw a cable with a connector into a pipe. <P>SOLUTION: A traction end part 1a for cable with connector is composed of a connector protection part 2 covering a connector 11, a cable grip 3 into which an optical cable (cable) 12 is inserted to grip the optical cable 12, and a wire attaching part 4 (traction wire attaching part) provided in the distal end of the cable grip 3 and connected to the cable grip 3. The connector protection part 2 is separated from the cable grip 3 and the wire attaching part 4. The connection protection part 2 is attached to the connector 11, the cable grip 3 is provided in the optical cable 12, a wire 13 previously inserted into a pipe is connected to the wire attaching part 4, and the wire 13 is wound up to route the optical cable 12 into the pipe. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a towing end portion to be attached to a cable with a connector when the cable with a connector is towed to a pipe.

In recent years, optical communication using an optical cable as a transmission medium has become widespread, and construction for laying an optical cable in a building such as a condominium or an office building has been performed.
The optical cable is laid in a pipe by inserting a wire that has been quoted in advance into a pipe provided in the building, and connecting the wire and the optical cable drawn into the building to wind up the wire. is doing. A connector is created at the tip of the optical cable laid at a predetermined position and connected to an optical outlet.

However, creating connectors in the field requires technology and dedicated tools, and is time consuming and poor in workability. Therefore, it is necessary to lay an optical cable that pulls the optical cable on which the connector has been created in the pipe in advance. Yes.
According to Patent Document 1, a tow protector at the tip of a cable connector that is attached to a cable on which a connector is created and towed is proposed.
In this cable connector tip traction protector, it is provided between a connector housing (connector protection section) for housing the connector provided at the cable tip and a towing line connected to the tip of the connector housing for towing the cable. It is made up of the intention prevention means. The connector housing holds the tip of the cable and the connector, protects the load between the cable and the connector from being concentrated, and waterproofs and dusts the joint between the cable and the connector. . The intention prevention means prevents the optical cable from being twisted.

International Publication No. 97/42531 (WO97 / 42531) Pamphlet

However, in the towing protector at the tip of the cable connector according to Patent Document 1, the connector housing holds the tip of the cable as well as the connector, and thus has a large shape with respect to the connector. When the piping for laying the cable is thin or when the piping has a crank, there is a problem that the connector housing cannot pass through the piping. In addition, since the load due to towing is applied to the connector, the connector may be damaged.
In addition, since the connector housing is formed in accordance with the shape of the connector, a dedicated connector housing is required for each type of connector, resulting in poor productivity.

  The present invention has been made in view of the above-described problems, and it is possible to lay a cable with a connector even in a thin pipe and to prevent the connector from being damaged by towing, a towing end portion for a cable with a connector. The purpose is to provide.

  In order to achieve the above object, a cable traction end portion with a connector according to the present invention is a traction end portion that is attached to a cable provided with a connector at a distal end portion thereof and that pulls the cable into a pipe. A cable grip that is inserted and grips the cable, a torsion attachment part that is provided continuously with the cable grip and to which the torsion line is attached, and a connector protection part that protects the connector, the connector protection part being a cable It is characterized in that it is separated from the grip and the towing line attachment part.

In the present invention, the pulling force due to the traction acts on the towing cable attachment portion and the cable grip, and the cable grip fixes and holds the cable from the periphery by the pulling force acting on the cable grip.
Since the connector protection portion is separated from the cable grip and the towline attachment portion, no pulling force acts on the connector protection portion, so that the connector can be prevented from being damaged by the pulling force.
Moreover, since the connector protection part should just be protected from the impact by the dust prevention and waterproofing of a connector, and contact with piping, it can be reduced in size compared with the conventional connector protection part which protects a connector from the pulling force of traction. And since the connector protection part is miniaturized, even a thin pipe or a crank portion can pass through, so that a cable with a connector can be laid on a thin pipe or a pipe with a crank.
In addition, since the cable is gripped by the cable grip, the same cable towing end with a connector can be used for cables having different diameters.

In the traction end portion for a cable with a connector according to the present invention, it is preferable that the connection portion between the cable grip and the traction cable attachment portion is located behind the connection portion between the connector and the cable in the traction direction.
In the present invention, the connecting portion between the cable grip and the towline attaching portion is located behind the connector and cable connecting portion in the towing direction, so that the force acting on the towline attaching portion and the cable grip by the towing can be reduced. Since it does not act on the protective part, damage to the connector can be prevented.

In the traction end portion for a cable with a connector according to the present invention, the traction cable attachment portion is preferably formed longer in the axial direction of the cable than the connector protection portion.
In the present invention, since the towing line attachment portion is formed longer in the axial direction of the cable than the connector protection portion, it is possible to avoid the pulling force of the tow acting on the connector protection portion and to prevent damage to the connector. it can.

Moreover, in the towing end portion for a cable with a connector according to the present invention, a cushioning material that covers the periphery of the cable may be provided between the cable and the cable grip.
In the present invention, by providing a buffer material covering the periphery of the cable between the cable and the cable grip, the cable can be fixed with the cable grip via the buffer material even when the cable is thin. Moreover, the same cable grip can be used by installing a cushioning material for cables having different diameters.
Moreover, the sudden bending of the connection part of a cable and a connector can be suppressed by making the front-end | tip part of a buffering material contact or set close to the connection part of a cable and a connector.

  According to the present invention, the connector protection portion is separated from the towline attachment portion and the cable grip, so that no traction force acts on the connector protection portion, thereby preventing damage to the connector due to the traction force. As well as being able to reduce the shape of the connector protection part and laying the cable with the connector even in a thin pipe, the workability of laying the cable in the pipe can be improved. .

It is a figure which shows an example of the tow end part for cables with a connector by 1st embodiment of this invention. (A) is a figure which shows an example of the traction end part for cables with a connector by 2nd embodiment of this invention, (b) is the sectional view on the AA line of (a). It is a figure which shows an example of the tow end part for cables with a connector by 3rd embodiment of this invention.

Hereinafter, a towing end portion for a cable with a connector according to a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the towing end portion 1a for a cable with a connector according to the first embodiment uses an optical cable 12 having a connector 11 attached to the tip of a CD (Combined) provided indoors such as an apartment or office building. Duct) A member that is towed into a pipe such as a pipe. Towing is performed in the direction of the arrow (A) in the figure.
The cable-attached cable pulling end 1 a is provided at the tip of the cable grip 3, which is continuous with the connector protector 2 that covers the connector 11, the cable grip 3 through which the optical cable 12 is inserted and grips the optical cable 12, and the cable grip 3. And a wire attachment portion 4 (towing attachment portion).

  The optical cable 12 is a cable in which a protective coating is applied to an optical fiber, and is mainly used for a communication line. A connector 11 is attached to the tip of the optical cable 12 for use. In the present embodiment, the optical cable 12 to which the connector 11 is attached in advance at a factory or the like is towed.

  The connector protection unit 2 is a cover that can cover the connector 11 and is formed of plastic, vinyl, or the like having substantially the same size as the connector 11. The connector protection unit 2 is attached to protect the connector 11 from impact caused by contact between the connector 11 and the pipe during towing, dust or water droplets in the pipe, and the like.

The cable grip 3 is a member having a mesh structure formed in a cylindrical shape having a predetermined length by knitting wire-like stainless steel, thread-like polyester resin, or the like, for example, in a lattice shape. When the cable grip 3 is compressed in the axial direction, the mesh expands in the radial direction and increases in diameter, and when pulled in the axial direction, the mesh expands in the axial direction and decreases in diameter.
The cable grip 3 into which the optical cable 12 is inserted has a smaller diameter by being pulled in the axial direction, and fixes the optical cable 12 so as to be tightened from the outer peripheral surface. At this time, it is preferable to set the length of the cable grip 3 so that the strength with which the cable grip 3 grips the optical cable 12 exceeds 200N.
The cable grip 3 is preferably formed of a material that generates a predetermined friction between the cable grip 3 and the optical cable 12 so as not to slip on the outer peripheral surface of the optical cable 12.

  The wire attachment portion 4 is continuous with a wire-like stainless steel or a thread-like polyester resin that forms the cable grip 3 at the tip of the cable grip 3, and is formed into an annular shape by bundling them. The wire attaching portion 4 is a member to which the towed wire 13 is attached at the time of towing. When the wire attachment portion 4 is pulled by towing, a tensile force acts on the cable grip 3 that is continuous with the wire attachment portion 4.

Next, the attachment method to the optical cable 12 of the cable pulling end part 1a with a connector mentioned above is demonstrated.
First, the cable grip 3 is compressed in the axial direction to increase the diameter and is put on the optical cable 12, and the cable grip 3 is pulled in the axial direction and fixed to the optical cable 12. At this time, the connecting portion 4 a between the cable grip 3 and the wire attaching portion 4 is positioned behind the connecting portion 12 a between the connector 11 and the optical cable 12 in the towing direction. Further, the distal end portion 4 b of the wire attachment portion 4 is positioned ahead of the connector protection portion 2 in the traction direction.

  When the optical cable 12 is inserted into the cable grip 3, the connector 11 and the optical cable 12 are inserted into a cylindrical mounting tool, the cable grip 3 is mounted on the mounting tool, the tool is removed, and the cable grip 3 is installed. May be.

And the connector protection part 2 is installed in the connector 11 attached to the front-end | tip part of the optical cable 12. FIG.
The cable grip 3 may be installed on the optical cable 12 after the connector protection unit 2 is installed on the connector 11. Alternatively, after the cable grip 3 is installed on the optical cable 12, the connector 11 may be created at the tip of the optical cable 12 and the connector protection unit 2 may be attached to the connector 11.
The rear end of the cable grip 3 in the towing direction is fixed to the optical cable 12 with a tape 5 or the like to prevent the cable grip 3 from coming off from the optical cable 12. Alternatively, the connector protection portion 2 may be fixed to the wire attachment portion 4 with a tape or the like, and the connector 11 may be held by the wire attachment portion 4 during towing.

Next, a description will be given of a method of pulling the optical cable 12 to which the cable-attached cable pull end 1a described above is attached into the pipe.
First, the wire 13 inserted in advance in the pipe is attached to the wire attachment portion 4. Then, the optical cable 12 is drawn and laid in the pipe by winding the wire 13 from the opposite side of the pipe.
Then, the cable pulling end 1 a with the connector is detached from the connector 11 and the optical cable 12. The removed cable pulling end 1a with the connector may be reused.

  At this time, the wire attachment portion 4 is pulled by the winding of the wire 13, and a tensile force acts on the cable grip 3, and the optical cable 12 is clamped and gripped from the periphery, so that the optical cable 12 can be pulled. Further, since the cable grip 3 can hold the optical cable 12 in a wide range, it is possible to prevent the optical cable 12 from being broken due to the force concentrated on one point of the optical cable 12.

  The connector 11 is protected by the connector protection part 2 and separated from the cable grip 3 and the wire attachment part 4, and the connection part 4 a between the cable grip 3 and the wire attachment part 4 connects the connector 11 and the optical cable 12. Since it is located behind the portion 12a in the traction direction, a tensile force does not act on the connector 11 and the connector protection portion 2 during traction, and the connector 11 can be prevented from being damaged.

Further, since the force due to the traction does not act on the connector protection portion 2, the shape can be made smaller than the conventional connector protection portion that protects the connector from the pulling force of the traction. Since the connector 11 can be reduced in size, it can be pulled in a thin pipe or a pipe with a crank.
Further, since the connector 11 is created in advance at the tip of the optical cable 12, it is not necessary to create the connector 11 that requires technology and time in the field, the construction period can be shortened, and the construction work of the optical cable 12 can be shortened. It can be made free.

  In the cable pulling end portion 1a with a connector according to the first embodiment described above, the connector protection portion 2 is separated from the cable grip 3 and the wire attachment portion 4, so that the connector protection portion 2 has a tensile force caused by towing. Since the connector protection part 2 can be reduced in size without acting, it can be pulled even with a thin pipe or a pipe with a crank, and the connector 11 can be prevented from being damaged by the pulling force. There exists an effect which can improve the construction nature of laying of optical cable 12 with connector 11. FIG.

Next, other embodiments will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted. A configuration different from the embodiment will be described.
As shown in FIGS. 2 (a) and 2 (b), in the cable pulling end portion 1b with connector according to the second embodiment, a buffer material 21 is provided around the optical cable 12, and the cable grip 3 is a buffer material. It is the structure installed on 21.
The buffer material 21 is, for example, a member obtained by making a cut 21a in the length direction in a rubber tube having a predetermined thickness, and is installed around the optical cable 12. The buffer material 21 is structured to be fitted around the optical cable 12 from the cut 21a. The cross-sectional shape of the buffer material 21 is substantially the same as or slightly smaller than the cross-sectional shape of the connector protection part 2. The length of the buffer material 21 is adjusted to the length for holding the optical cable 12.
The buffer material 21 is installed so that the tip thereof is in contact with the connector protection unit 2.

  In the cable pulling end portion 1b with the connector according to the second embodiment, since the buffer material 21 is attached around the optical cable 12, even when the optical cable 12 is thin relative to the cable grip 3, the optical cable is passed through the buffer material 21. 12 can be gripped and fixed. Further, by attaching the buffer material 21 to the optical cables 12 having different diameters, the same cable pulling end portion 1b with a connector can be used. Further, since the buffer material 21 and the connector protection part 2 are in contact with each other, it is possible to prevent a sudden bending of the connection part 12a between the connector 11 and the optical cable 12 when passing through the bending of the pipe during towing.

  In the cable pulling end portion 1b with the connector according to the second embodiment, the optical cable 12 can be gripped and pulled by the cable grip 3 via the cushioning material 21, so that the cable with the connector according to the first embodiment is used. The same effects as the towing end portion 1a are obtained.

The cable pulling end portion 1 c with connector according to the third embodiment shown in FIG. 3 includes a buffer material 31 having a cross section formed larger than the cross section of the connector protection portion 2. When the cable grip 3 is pulled by the optical cable 12 in which the buffer material 31 is installed around the cable grip 3 and the optical cable 12 in which the cable towing end 1c with connector is installed around the connector protection unit 2, the cable grip 3 is pulled. The cable grip 3 fastens and fixes the buffer material 31. At this time, the cable grip 3 is also installed around the connector protection portion 2, but since the connector protection portion 2 has a smaller cross-sectional shape than the buffer material 31, the connector grip 2 has almost no tightening force due to the cable grip 3. It is the structure which does not act.

  In the cable traction end portion 1c with connector according to the third embodiment, the optical cable 12 can be gripped and pulled by the cable grip 3 via the cushioning material 31, so that the cable with connector according to the first embodiment can be pulled. The same effects as the towing end portion 1a are obtained.

As mentioned above, although embodiment of the tow end part for cables with a connector by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the embodiment described above, the optical cable 12 with the connector 11 is towed. Instead of the optical cable 12, the tow end portion for the cable with the connector according to the present invention is used when towing another cable. Also good.
In the second embodiment, the buffer material 21 and the connector protection unit 2 are in contact with each other, but the buffer material 21 and the connector protection unit 2 may be separated from each other.

1a, 1b, 1c Towing end for cable with connector 2 Connector protection 3 Cable grip 4 Wire attachment (towing end)
4a connection part 11 connector 12 optical cable (cable)
21, 31 cushioning material

Claims (4)

It is attached to a cable provided with a connector at the tip, and is a towing end for towing the cable into a pipe,
A cable grip through which the cable is inserted and grips the cable;
A traction line attachment portion provided continuously with the cable grip, to which the traction line is attached;
A connector protection portion for protecting the connector, wherein the connector protection portion is separated from the cable grip and the towline attachment portion.   The cable pulling end portion with a connector according to claim 1, wherein a connection portion between the cable grip and the towline attachment portion is located rearward in the pulling direction with respect to the connection portion between the connector and the cable. .   The towing end portion for a cable with a connector according to claim 1, wherein the towline attachment portion is formed longer in the axial direction of the cable than the connector protection portion.   The cable pulling end portion with a connector according to any one of claims 1 to 3, wherein a buffer material that covers the periphery of the cable is provided between the cable and the cable grip.

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