JP3002872B2 - Threading device for helical support for cable suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawstring passing device for feeding and retracting a cable into a spiral support for suspending the cable on a messenger wire.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No.
No. 09374 (JP-A-9-135510),
With a safety method that does not require conventional dangerous suspension work,
In addition, a method for installing a spiral support for hanging a cable, which does not fall off or slip off, and a drawstring passing device for feeding a cable into the spiral support are proposed.

FIG. 3 is a schematic side view showing a construction method using a drawstring passing tool at that time. Within the diameter of the spiral support 3 wound around the messenger wire 2 stretched between the utility poles 1a and 1b, the worker 5 riding on the bucket 4 installed near one of the utility poles 1a draws the string through the stringer 106. It is a construction method which does not need to perform dangerous hanging work by pushing the drawstring part 110 by using it.

FIG. 4 shows a drawstring passing device 106 at that time.
FIG. The drawstring passing device 106 is connected to the drawstring portion 11.
0, a first conducting portion 107, and a blade portion 108,
A connecting portion 109 and a coupling portion 112 are provided on this. That is, the drawstring passing device 106 is provided with a conical leading end portion 107 at the front end, a wing portion 108 such as a leaf spring 108a attached at the rear, and a drawstring portion 110 made of a resilient rigid body at the rear end. Is provided. And the connecting portion 109
Is composed of a support portion of a coupling portion 112 having a structure broken in the vertical direction, and the coupling portion 112 is attached to the messenger wire 2.

[0005] In some cases, the drawstring passing tool 106 is not only pushed in at the time of construction, but sometimes it is necessary to examine the state of the previously constructed construction by pulling it in. However, in the drawstring passing device 106 of FIG. 4, the wings 108 such as leaf springs are in a state where they are stretched backward and hem, so that if they are pulled in this state, they can be hooked and returned. Did not.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention relates to a drawstring threading tool used in the method of installing a spiral support for hanging a cable disclosed in Japanese Patent Application Laid-Open No. Hei 9-135510, An object of the present invention is to provide a drawer for a helical support for hanging a cable, which can be pulled in as well as drawn.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a drawstring passing device for feeding and drawing a cable into a helical support for hanging a cable stretched between utility poles. The front end of the conical front conducting portion 7 and the front end of the plurality of leaf springs 8 are fixed to the rear of the conical front conducting portion 7 and the rear end of each leaf spring is focused on the connecting portion;
A spheroidal blade formed by expanding a central portion of each leaf spring, a sleeve 11 slidably supporting the connecting portion, and a rear portion of the sleeve 11 are connected. It is constituted by a drawstring portion made of a resilient rigid body and is used as a means for solving the problem. In addition, a coupling portion for covering a messenger wire that is stretched when a cable is drawn in is attached to an upper portion of the first conductive portion to solve the problem.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing one embodiment of the drawstring passing device of the present invention. FIG. 2 is a side view showing another embodiment of the drawstring passing device of the present invention.

The construction method using the product of the present invention is described in FIG.
As shown in the figure, an operator riding on a bucket 4 installed near one of the power poles 1a within the diameter of a spiral support 3 wound around a messenger wire 2 previously stretched between the power poles 1a and 1b. Reference numeral 5 denotes a construction operation using a drawstring passing tool.

FIG. 1 shows an embodiment of a pull cord passing device 6 according to the present invention for drawing a cable into a spiral support 3 for suspending a cable stretched between the electric poles 1a and 1b. . At the tip of the drawstring threader 6, a conical tip conducting portion 7 is provided. A blade 8 such as a leaf spring is attached to the rear in an elliptical spherical shape. Therefore, the wings 8 converge later, and a connecting portion 9 provided at the rear end thereof is connected to a drawstring 10 made of a resilient rigid body.

In the case of this embodiment, the drawstring 10 is 2.5
It is made of synthetic resin (FRP) reinforced by glass fiber of about mmφ. This may be a metal or synthetic resin material-coated product, but it is a rigid body that can keep the linearity enough to be inserted into the inside of the diameter of the spiral support 3,
Moreover, it is made of a material having some resilience.

The connecting portion 9 is a support portion, and has a sleeve 11 for connecting a drawstring portion 10 made of metal such as stainless steel. By the way, in the case of the present embodiment, the conical front conducting portion 7 at the tip is made of a rocket-type metal, but the shape and the material can be appropriately selected as long as it has a pointed conical shape. . Behind the first conducting portion 7, a blade portion 8 such as a leaf spring 8a is attached in a state of protruding in an elliptical spherical shape.

The leaf spring 8a is formed by bending a plurality of strips of piano wire, is electrically conductive, is silver-brazed to the rear outer periphery of the portion 7, and is formed of a plurality of separated aggregates just like a chasen. In the case of this embodiment, the blade section 8 is composed of four leaf springs. Therefore, each leaf spring 8a-8 of the blade part 8
When a is inserted into the outer circumference smaller than the outer diameter in the expanded state, the diameter of a is automatically reduced to a small value, and is urged to rebound when opened. The outer diameter of the blade 8 must be able to be inserted into the inner diameter of the spiral support 3 at least in a reduced state. Also the wings 8
Is required to be longer than at least one pitch length P of the spiral support 3 in FIG. 3, and preferably a length of two pitches or more.

That is, in the drawstring passing device 6 of the present invention, the center wire 12 in the sleeve 11 is in the direction of arrow T when the elliptical spherical leaf spring 8a is in the state of the original expanded and large outer diameter. . On the other hand, the leaf spring 8a is
When the outer diameter is small and reduced, the sleeve 11
Is extended in the direction of arrow S. It is characterized in that in this reduced state, not only feeding but also drawing can be performed.

FIG. 2 shows another embodiment of the drawstring passing device of the present invention. At the tip of the drawstring threader 26,
A conical tip conducting portion 27 is provided. At the rear, a blade portion 28 such as a leaf spring 28a is attached in an elliptical spherical shape.
Therefore, the wings 28 converge at the connecting portion 29 at the rear end, and the pulling string 30 made of a resilient rigid body is connected to the connecting portion 29 provided at the rear end via the sleeve 31. Is the same as in the previous embodiment.

However, in the case of the present embodiment, a coupling portion 32 for covering the messenger wire 2 which is stretched when the cable is drawn in is integrally attached to the upper portion of the first conducting portion 27. I do. The coupling portion 32 of the present embodiment has an inner diameter slightly larger than the outer diameter of the messenger wire 2, and the upper portion is vertically broken, so that it can be easily covered on the surface of the messenger wire 2 from below. Can be done.

The drawstring passing device 6 having the above structure,
26 can be easily fed by inserting it into the diameter of the spiral support 3 for hanging the cable and pressing it from the rear.
In the case where the coupling portion 32 is provided, since the surface of the messenger wire 2 can be smoothly slid, the feeding is further facilitated. Further, since the leading ends of the first conducting portions 7 and 27 are sharp, they can be rushed so as to push through the inside of the spiral support 3 for hanging the cable, and the outer diameters of the blades 8 and 28 are spiral. The cords are reduced along the inner diameter of the spiral support 3, and the drawstring portions 10, 30 are passed through the diameter of the spiral support 3.

Then, when the pull cord passing devices 6 and 26 reach the other electric pole 1b, the cables laid at the rear ends of the pull cord portions 10 and 30 are connected. Then, the drawstring portions 10 and 30 are wound up by a winch (not shown), and the cable is drawn into the diameter of the spiral support 3. In this case, although not shown in the drawing, a pull-in rope is laid between the electric poles 1a-1b between the electric poles by using the drawstring passing devices 6 and 26, respectively. By connecting both ends of each rope, it is possible to pull in a long span at a time. In addition, when additional cables are installed, although not shown, if the drawstring passing devices 6 and 26 are inserted into the diameter of the spiral support 3 in which the messenger wire 2 and the cable are already inserted. It can be constructed in the same manner, and the drawstring passing device of the present invention 6,2
6 is used for these constructions.

[0019]

By using the drawstring passing device of the present invention, the spiral support device can be pulled in as well as fed.

The use of the drawstring puller of the present invention eliminates the need for dangerous hanging work and allows all work to be performed near the utility pole. , Can be done safely and effortlessly.

When the drawstring passing device of the present invention is used, the cable can be smoothly drawn into the spiral support device within the diameter of the spiral support device.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a drawstring passing device of the present invention.

FIG. 2 is a side view showing another embodiment of the drawstring passing device of the present invention.

FIG. 3 is a schematic side view showing an example of construction using a conventional drawstring passing device.

FIG. 4 is a side view showing an embodiment of a conventional drawstring passing device.

[Explanation of symbols]

 Reference Signs List 1a telephone pole 1b telephone pole 2 messenger wire 3 helical support 4 bucket 5 worker 6 drawstring passing tool 7 conical tip conducting section 8 blade section 8a leaf spring 9 connecting section 10 pullstring section 11 sleeve 12 center wire rod 26 pullstring passing Tool 27 Conical leading end portion 28 Blade portion 28a Leaf spring 29 Connecting portion 30 Pulling cord portion 31 Sleeve 32 Coupling portion 33 Center wire 106 Pulling string passing tool 107 Leading conducting portion 108 Blade portion 108a Leaf spring 109 Connecting portion 110 Pulling cord Part 111 Sleeve 112 Coupling part L Length of pulling string passing device P One pitch of spiral support S Direction of decreasing outer diameter of leaf spring T Direction of increasing outer diameter of leaf spring

Claims (2)

(57) [Claims] 1. A drawstring passing tool for feeding and drawing a cable into a spiral support for suspending a cable stretched between telephone poles, wherein the drawstring passing tool has a conical leading conductive portion at a tip end. 7 and the front ends of the plurality of leaf springs 8 are connected to the rear part of the conical leading edge of the above-mentioned conical section 7, and the rear ends of the respective leaf springs are focused on the connecting portion. A spheroidal blade formed by bulging, a sleeve 11 for slidably supporting the connecting portion, and a pull cord made of a resilient rigid body connected to the rear of the sleeve 11. And a helical support for suspending a cable. 2. A cable suspension according to claim 1, wherein a coupling portion for covering a messenger wire which is stretched when the cable is drawn in is mounted on the upper portion of the leading portion. A threading tool for a spiral support.