KR100258547B1 - Pulling eye and method how to use it - Google Patents

Abstract

PURPOSE: A pulling eye and a method how to use it are provided to be capable of distributing the concentration the tensile stress applied to a center extension line by simultaneously pulling the center extension line and sub extension lines of respective units when mounting optical cables, and to rigidly couple the sub extension lines to pull the optical cables. CONSTITUTION: A body member(10) comprises an inlet part(11), a tapered expansion part(13), an inlet hole(14) and screws(30). A center cable(42) of an optical cable is entered to the inlet part(11). A sloped surface inclined from the outer end of the inlet part(11) is formed on the tapered expansion part(13). The inlet hole(14) is lengthwise formed on the inlet part(11), a center extension line(44) within the center cable(42) is entered to the inlet hole(14). The screws(30) are fastened to screw holes(16) connected to the inlet hole(14) to fix the center extension line(44). A hook(20) is coupled to one end of the body member(10) opposite to the inlet part(11) for rotated in a direction orthogonal to the lengthwise center line of the body member(10). A fastening member covers the expansion part(13) to fix a sub extension line(48) of the optical cable(40).

Description

Pooling Eye and How to Use It

The present invention relates to a pulling eye for pulling an optical cable and a method of using the same. More particularly, the present invention provides a pulling eye and a sub-tensioning line of a unit at the time of laying an optical cable. It relates to a pulling eye and a method of using the same so that the tensile stress is dispersed.

In today's information society, various optical cables are installed underground, underwater and in the air, which can be installed in tens of thousands or thousands of kilometers. When laying and laying optical cables like this, digging the installation section of the optical cable, wiring the optical cable in it, and burying it with soil.

However, when the optical cable is installed as described above, it is very difficult to check whether there is a problem such as disconnection in the line of the optical cable, and it is very difficult to repair and replace the cable.

Therefore, in recent years, the installation work of the optical cable has been utilized by installing a hollow pipe having a constant diameter in the ground and inserting the cable into the pipe. However, pipelines can be buried or connected at regular distances because they can be buried in lengths of hundreds to thousands of kilometers.

As a result, it is not easy to insert an optical cable into a communication port for branching or connecting an optical cable, that is, a pipe is rarely buried in a straight line when installed in a pipeline. Also, when the pipeline is buried in the ground, the rope is inserted into the ground, and the cable is pulled into the pipeline by pulling the rope. As such, when the rope is tied to the end of the optical cable and the optical cable passing through the twisted conduit contacts the inner wall, a large frictional resistance is generated, and thus the optical cable is broken by the excessive tensile force of the rope tied to the cable.

Accordingly, a pulling eye has been proposed to tow the optical cable more effectively.

1 is a perspective view showing an optical cable.

Referring to this, the optical cable 40 has a center cable 42 in which the center tension line 44 is built, and a plurality of units 45 are arranged around the center cable 42. In the unit 45, a subtension cable 46 having a subtension line 48 embedded therein is disposed at the center of the slot rod, and a spiral slot 47 is formed along the outer circumferential surface thereof. In the slot 47, a multi-core optical fiber ribbon 49 is stacked.

Figure 2 is an exploded perspective view showing a conventional pulling eye.

Referring to this, the pulling eye is largely composed of the body member 10 and the ring 20, one side of the body member 10 is formed with an inlet portion 11 is inserted into the center cable 42 of the optical cable 40 On the other side, the fastening portion 12 to which the ring 20 is coupled is formed. In addition, a screw hole 16 to which the screw 30 is fastened is formed on the outer circumferential surface between the fastening portion 12 and the lead portion 11 of the trunk member 10.

The inlet portion 11 is formed with an inlet hole 14 through which the central tension line 44 embedded in the center cable 40 is inserted in the longitudinal direction from the inner side thereof. The inlet hole 14 communicates with the screw hole 16, and the central tension line 44 drawn into the inlet hole 14 is tightened by a screw 30 fastened to the screw hole 16. As shown in FIG.

The ring 20 is coupled to be rotated by the rotation means in the fastening portion 12 of the body member 10, the ring 20 is formed on one side of the fastening hole 22 and the coupling piece 24 is formed On the other side, the rotating shaft 26 is formed with a screw thread on the outer peripheral surface is coupled.

The rotation means is for rotatably coupling the ring 20 at the fastening portion 12 of the body member 10, the cap 27 and a plurality of bearings 28 and nuts coupled to the fastening portion 12 It consists of 29.

Cap 27 is coupled to the fastening portion 12, the center is formed with a rotating hole in which the rotating shaft 26 of the ring 20 is fitted.

The bearing 28 is rotated in contact with the inner circumferential surface of the fastening portion, and a through hole into which the rotating shaft 26 of the ring 20 is fitted is formed at the center thereof.

3 is a cross-sectional view showing an optical cable coupled to a conventional pulling eye.

Referring to this, the center cable 42 of the optical cable 40 is inserted into the inlet portion 11 of the body member 10, and the center tension line 44 of the center cable 42 is inserted into the inlet hole 14. do. Then, the screw 30 is fastened to the screw hole 16 so that the center tension line 44 is tightened by the screw 30 so that the optical cable 40 is bound to the trunk member 10.

Meanwhile, when the cap 27 and the bearing 28 and the nut 29 are sequentially coupled to the rotation shaft 26 of the ring 20, the ring 20 is rotated in the cap 27. When the cap 27 is coupled to the fastening part 12 in the assembled state, the ring 20 is assembled to rotate in the body member 10.

When the optical cable is connected to the pulling eye of such a structure and dragged using the ring 20 in the pipeline of several hundred meters, the central tension line 44 is tightened in point contact with the screw 30 at the inlet hole 14. 40 is attracted.

However, since the surface of the optical cable 40 is in contact with the pipe line and the frictional force thereof is increased, the tensile stress applied to the optical cable 40 is gradually increased. At this time, as the excessive stress is concentrated in the central tensile line 44 of the portion tightened by the screw 30, the central tensile line 44 is worn or elongated, and in severe cases, the central tensile line 44 is cut. There was this.

It is an object of the present invention to provide a pulling eye which can disperse the concentration of tensile stress applied to the central tensile line by simultaneously pulling the central tensile line and the sub-tension line of each unit when laying the optical cable.

Another object of the present invention is to provide a method of using a pulling eye that can firmly bind the sub-tension lines of the optical cable to tow the optical cable.

1 is a perspective view showing a multi-unit optical cable;

2 is an exploded perspective view showing a conventional pulling eye,

3 is a side cross-sectional view showing an optical cable coupled to a conventional pulling eye;

Figure 4 is an exploded perspective view showing a pulling eye according to the present invention,

5 is a side cross-sectional view of a fastener constituting a pulling eye according to the present invention;

Figure 6 is a side cross-sectional view showing that the optical cable is coupled to the pulling eye according to the present invention;

Figure 7 is a partially enlarged cross-sectional view showing that the sub-tension line of the optical cable is coupled to the pulling eye according to the present invention.

*** Explanation of symbols on the main parts of the drawing ***

10: body member 11: inlet

12: fastening portion 13: expansion portion

14: insertion hole 16: screw hole

18: screw portion 20: ring

22: fastening hole 24: fixing piece

26: rotating shaft 28: bearing

29: nut 30: screw

40: optical cable 42: center cable

44: center tensile line 45: unit

46: subtensile cable 47: slot

48: sub-tension line 49: optical fiber ribbon

50: fastener 52: guide surface

54: guide 60: fixture

In order to achieve the above object, the present invention provides a pulling eye for pulling a multi-unit optical cable, the inlet portion is formed inward from one side end to the center cable of the optical cable, and from the outer end of the outer peripheral surface of the inlet portion to the inside A tapered extension portion having an inclined surface having a predetermined slope, an inlet hole formed in the longitudinal direction at the inner surface of the inlet portion, into which a central tensile line embedded in the center cable is introduced, and formed to communicate with the inlet hole at an outer circumferential surface thereof. A body member comprising a screw coupled to a screw hole to fix the center tensile line, and a ring rotatably coupled in a direction perpendicular to a longitudinal center line at an end of the body member corresponding to the opposite side of the inlet; Overlaid on the extension to fix the sub-tension line of the optical cable It has a feature consisting of a fastening member.

The body member has a feature that the threaded portion is formed on the outer peripheral surface corresponding to a predetermined length range from the end of the extension portion.

The fastening member has a fastening member formed in a tapered shape having an inner circumferential surface having the same gradient as the outer circumferential surface of the extension portion, and a fastener for screwing in the screw portion and controlling the fastening and detachment state of the fastener for the extension portion.

According to the configuration of the present invention, the center tension line of the optical cable is inserted into the inlet hole of the body member and tightened with a screw, and each unit sub-tension line is extended into the expansion portion along the guide groove of the fastener. When the fixture is in close contact, the subtension is tightened between the inner surface of the fastener and the extension.

In another configuration of the present invention, in the use of a pulling eye, a fixing step of inserting the center cable into the inlet portion and fixing the center tensile line with a screw, and guide grooves on the outer circumferential surface of the fastener to the subtension line of each unit The insertion step of retracting from the end and retracting the fastener along the inner circumference of the fastener; and the close contact step of bringing the inner circumference of the fastener into close contact with the outer circumferential surface of the fastening part; Characterized in that it is used through the tightening step to be tightened between the expansion and the fastener.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is an exploded perspective view showing a pulling eye according to the present invention.

Referring to this, the pulling eye is composed of a trunk member 10 and the ring 20, the trunk member 10 is the inlet portion is inserted into the central cable 42 of the optical cable 40 by a predetermined length from one side end to the inside 11 is formed and the other end is formed with a fastening portion 12 to which the ring 20 is coupled. A plurality of screw holes 16 to which the screw 30 is fastened are arranged on the outer circumferential surface between the fastening portion 12 and the lead portion 11.

On the other hand, the inlet hole 14 through which the center tension line 44 embedded in the center cable 42 is inserted in the longitudinal direction from the inner side of the inlet part 11 is formed. The inlet hole 14 is in communication with the screw hole 16, the end of the screw 30 fastened to the screw hole 16 is to press the center tension line (44).

And the extension part 13 added to the outer peripheral surface of the lead-in part 11 so that the inclined surface which has a constant inclination from the outer end to the inner side may be formed. A screw portion 18 is formed on the outer circumferential surface by a predetermined length from the end of the expansion portion 13.

In addition, a fastener 50 for guiding the sub-tension line 48 of the unit 45 is coupled to the outer circumferential surface of the expansion part 13 by the fastener 60 coupled to the threaded portion 18.

The fixture 60 is coupled to the threaded portion 18 of the body member 10, the thread is formed on the inner circumferential surface with the same length as the outer diameter of the body member 10, the guide surface of the fastener (50) at one side end surface ( A fallopian tube-shaped clamping portion 62 is formed so as to be covered with 52).

The ring 20 is rotatably coupled to the rotating means at the fastening portion 12 of the body member 10. The ring 20 has a coupling piece 24 having a fastening hole 22 for coupling a rope or the like to the outer side, and protrudes a predetermined length on the inner side, and a rotating shaft 26 having a screw thread on the outer circumferential surface thereof. It is formed integrally.

Elements constituting the rotating means are given the same reference numerals as those given in FIG. The rotating means has a cap 27 having a rotating hole into which the rotating shaft 26 of the ring 20 is rotated, and is coupled to the rotating shaft 26 inside the cap 27 so as to contact the inner peripheral surface of the fastening portion 12. The bearing 28 is rotated, and the nut 29 is engaged and engaged inside the bearing 28 to prevent the ring 20 from being separated from the body member 10.

5 is a cross-sectional view showing a cross section of a fastener which is a component of a pulling eye according to the present invention.

Referring to this, the inner circumferential surface of the fastener 50 has a tapered shape having the same gradient as the outer diameter of the expansion portion 13, and an uneven portion 56 is formed around the inner circumferential surface. And the guide surface 52 which has a constant inclination from the side edge part is formed in the outer peripheral surface of the side part with short inner diameter of the fastener 50. As shown in FIG. In addition, a plurality of guide grooves 54 are formed on the outer circumferential surface of the fastener 50 so as to be spaced apart at a predetermined angle to guide the sub-tension line 48 in the longitudinal direction.

Figure 6 is a side cross-sectional view showing that the optical cable is coupled to the pulling eye according to the present invention.

Referring to this, the optical cable 40 leads the center cable 42 and the sub tension cable 46 of each unit 45 by a predetermined length, and then ends of each of the sub tension cable 46 and the center cable 42. Stripping the coating by a predetermined length at exposes the central tensile line 44 and the subtensioning line 48.

In this way, when the sheath stripped center cable 42 is inserted into the inlet portion 11, the center tension line 44 is inserted into the inlet hole 14 at the same time. Then, when the screw 30 is fastened to the screw hole 16, the free end of the screw 30 presses the center tensile line 44.

As shown in FIG. 7, the subtension cable drawn from each unit 45 in the guide groove 56 of the fastener 50 coupled to the extension 13 of the body member 10 in the coupled state ( The sub-tension line 48 of 46 is pulled back and pulled back from the end of the fastener 50 to be introduced between the extension portions 13. The tip of the sub-tension line 48 drawn between the expansion part 13 and the fastener 50 is discharged to be exposed to the outer end of the fastener 50.

In addition, when the fastener 60 is rotated forward by the screw portion 18 of the trunk member 10, the inner circumferential surface of the fastener 50 is brought into close contact with the outer circumferential surface of the expansion portion 13, and at the same time, the clamping portion 62 is the guide surface 52. The sub-tension line 48 is tightened when the sealing force of the expansion part 13 and the fastener 50 is increased by pressurizing.

On the other hand, the fastening portion 12 of the body member 10 is coupled to the ring 20 is rotated in the same manner as described in FIG.

As described above, when the optical cable 40 is installed, the optical cable 40 is connected to the trunk member 10 of the pulling eye according to the present invention, and the rope is connected to the fastening hole 22 of the ring 20 to draw the lead. In the hole 14, the stress is distributed to the center tension line 44, which is screwed to the screw 20, and the sub-tension line 46, which is joined between the expansion portion 13 and the fastener 50.

At this time, because the sub-tension line 46 is bent and tightened in the fastener 50 in the direction opposite to the direction in which the ring 20 is dragged, not only the tensile stress is applied to the sub-tension line 48 but also the fastener fastened to the fixture 60. The uneven portion 56 of the 50 prevents the sub-tension line 48 from sliding in the direction dragged from the outer circumferential surface of the extension 11.

According to the present invention described above, when the pulling eye simultaneously pulls the center tensile line of the optical cable and the sub-tensioning line of each unit, the tensile stress applied to the optical cable is distributed to the center-tensioning line and the sub-tensioning line so that the center-tensioning line is damaged or cut. This prevents the cable from being stably laid.

Further, the subtension of the optical cable can be firmly bound to the pulling eye by the extension part of the trunk member and the fastener.

Claims (5)

In a pulling eye for pulling a multi-unit optical cable, A tapered shape having an inlet portion 11 formed at an inner side at one end thereof, and having an inlet portion 11 into which the center cable 42 of the optical cable 40 is introduced, and an inclined surface having a constant inward from the outer end of the inlet portion 11. An extension hole 13, an inlet hole 14 formed in the longitudinal direction at the inner surface of the inlet part 11, into which the central tension line 44 embedded in the center cable 42 is introduced; A body member 10 which is coupled to a screw hole 16 formed in communication with the inlet hole 14 and is coupled with a screw 30 for fixing the center tensile line 44; A ring 20 coupled to be rotated in a direction orthogonal to the longitudinal center line at the end of the trunk member 10 corresponding to the opposite side of the inlet 11; A pulling eye comprising a fastening member which is covered by the expansion part 13 to fix the sub-tension line 48 of the optical cable 40. The method of claim 1, The trunk member 10 is a pulling eye, characterized in that the threaded portion 18 is formed on the outer circumferential surface corresponding to a predetermined length range from the end of the expansion portion (13). The method of claim 1, The fastening member has a fastener 50 made of a tapered shape having an inner circumferential surface having the same gradient as that of the outer circumferential surface of the expansion part 13, Pulling eye, characterized in that consisting of a fastener (60) that is screwed on the screw portion (18) and controls the fastening and detachment state of the fastener (50) for the expansion portion (13). The method of claim 3, The fastener (50) is a pulling eye, characterized in that formed in the longitudinal direction a plurality of guide grooves (52) for guiding the sub-tension line 48 at each position divided by a predetermined angle on the outer peripheral surface. In using the pooling eye, A fixing step of inserting the center cable 42 into the inlet part 11 and fixing the center tension line 44 with the screw 30; An insertion step of inserting the sub-tension lines 48 of the units 45 along the guide grooves 52 of the outer circumferential surface of the fastener 50 and then retracting them from the ends to retract them along the inner circumferential surface of the fastener 50; A close step of bringing the inner circumferential surface of the fastener 50 into close contact with the outer circumferential surface of the expansion part 13; Method of using a pulling eye including a tightening step for advancing and retracting the fixture 60 in the threaded portion 18 of the trunk member so that the sub-tension line 48 is tightened between the extension 13 and the fastener 50. .