JP2000270431A - String passing tool of spiral support for suspending cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spiral support for suspending a cable in which the cable can not only be pushed in but also be pulled in by an arrangement wherein the outside diameter at the ellipsoidal blade of a string passing tool can be adjusted to correspond to the diameter of the spiral support. SOLUTION: A conical leading/passing part 7 is provided at the forward end of a string passing tool 6 and a blade 8, e.g. a leaf spring, is stretched elliposidally in the rear. The blades 8 are bundled at a rear end coupling part 9 and a pull string part 10 made of a resilient rigid body is coupled to the rearmost end. The coupling part 9 is provided with a sleeve 12. When respective ellipsoidal leaf springs 8a are enlarged and the outer diameter of the string passing tool 6 is large, the central wire 13 in the sleeve 12 is elongated in the direction of arrow T. When the outside diameter of each leaf spring 8a is contracted in a spring support 3, the central wire 13 in the sleeve 12 is elongated in the direction of arrow S. Under the contracted state, a cable can not only be fed in but also be pulled in.

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 helical support for hanging the cable on a messenger wire.

[0002]

2. Description of the Related Art The present applicant has filed Japanese Patent Application No.
No. 56173, a method for constructing a helical support for suspending a cable by a safety method which does not require a conventional dangerous suspension work, and which does not fall off or slip off, and a method for feeding and drawing a cable into the helical support. A drawstring implement was proposed.

FIG. 2 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. 3 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 is provided for this. That is, the drawstring passing tool 106 is provided with a conical tip conducting portion 107 at the tip,
A blade 108 such as a leaf spring 108a is attached to the rear, and a drawstring 110 made of a resilient rigid body is provided at the rear end. The connecting portion 109 is attached to the drawstring portion 110 messenger wire 2 via the sleeve 112, and can be slid by the center wire 113 in the sleeve 112.

However, the outer diameter of the elliptical sphere of the wing portion 108 may be slightly larger than the diameter of the spiral support member 3, but if the outer diameter is too different, the insertion is not allowed if the outer diameter is too large. This has been a drawback in the prior art since it becomes unstable when it is too small.

As a prior art of the present technology, there is also a disclosure in Japanese Patent Application Laid-Open No. Hei 10-271627. However, the one described in this publication cannot adjust the outer diameter of the wing elliptical sphere in advance, similarly to FIG. Was.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention is an improvement of the drawstring passing device of the spiral support for suspending a cable disclosed in Japanese Patent Application No. 9-256173. It is an object of the present invention to provide a drawstring passing device capable of adjusting the outer diameter of the elliptical sphere in advance as necessary.

[0008]

According to the present invention, there is provided a drawstring passing device for drawing a cable into a helical support for suspending a cable stretched between utility poles to achieve the above object. At the tip of the drawstring passing device, a conical leading portion is provided, and at the rear, a blade portion such as a leaf spring is attached in an elliptical sphere around the center wire, and the blade portion is focused at the connecting portion at the rear end. ,
A rod connected to the center wire and having a male screw engraved at the rear end is provided at the rear of the connecting part, and a spring is provided between a female screw screwed to the male screw of the rod and the connecting part, and a rod is provided. The present invention constitutes a drawstring passing device of a helical support for hanging a cable having a pullstring portion made of a resilient rigid body at a rear end.

[0009]

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 schematic side view showing an example of construction using a drawstring passing device.

[0010] As shown in FIG. 2, the construction using the present invention is performed in such a manner that one of the helical supports 3 is wound by a messenger wire 2 previously stretched between utility poles 1a and 1b. Worker 5 on bucket 4 installed near telephone pole 1a
However, construction work is performed using a drawstring passing tool.

FIG. 1 shows an embodiment of a drawstring passing device of 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 at a connecting portion 9 provided at the rear end, and a pull cord 10 made of a resilient rigid body is connected to the last end.

In the case of this embodiment, the drawstring 10
It is made of synthetic resin (FRP) reinforced with glass fibers 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 supporting portion, and has a rear end portion 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 if it has a pointed conical shape,
The shape and material can be appropriately selected. 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 number of piano wires, firstly conducting, silver-brazed on the outer periphery of the rear portion of the portion 7, and composed of a number of separated assemblies just like a chasen. I have. 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.

The connecting member 9 is provided with a sleeve 12. That is, in the drawstring passing device 6 of the present invention, when each of the elliptical spherical leaf springs 8a to 8a is in the state of the original expanded and large outer diameter, the center wire 13 in the sleeve 12 is in the direction of the arrow T. . On the other hand, when each of the leaf springs 8a to 8a is in a state where the outer diameter is reduced and reduced in the spiral support 3, the center wire 13 in the sleeve 12 is extended in the direction of the arrow S. In this reduced state, not only feeding but also pulling can be performed.

However, if the outer diameter D of the elliptical sphere of the blade 8 is too different from the diameter of the helical support 3, the excessively large outer diameter D will not work if it is too large, and will become unstable if it is too small. Therefore, the drawstring passing device 6 of the present invention has an elliptical spherical outer diameter D composed of the blade portions 8 of the leaf springs 8a to 8a.
Can be adjusted in advance by the connecting portion 9. Thereby, the outer diameter D of the elliptical sphere can be adjusted in advance in accordance with the diameter of the spiral support 3, and this is characterized in that it can be adjusted in advance.

A sleeve 12 is connected to the connecting portion 9, and a rod 15 having an external thread 14 is provided on the outer periphery of the rear end of the sleeve 12. On the outer periphery of the rod 15, a female screw 16 screwed to the male screw 14 is provided, and a spring 17 is provided between the female screw and the connecting portion. Therefore, when the female screw 16 is turned, the connecting portion 9 moves forward and backward. That is, in the direction of arrow T, the outer diameter D of the elliptical spherical blade portion 8 expands and increases. Further, when the elliptical spherical blade portion 8 is shifted in the direction of the arrow S, the outer diameter D is reduced. However, the urging of the spring 17 does not hinder the slide during insertion.

The drawstring passing device 6 having the above structure
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. Further, since the leading end of the first conducting portion 7 is sharp, it can be made to protrude so as to push through the diameter of the spiral support 3 for suspending the cable, and the outer diameter D of the elliptical sphere of the blade 8 is a spiral. It is easy to reduce the size along the inner diameter of the
0 is passed through the diameter of the spiral support 3.

When the draw string passing tool 6 reaches the other electric pole 1b, a cable laid at the rear end of the draw string portion 10 is connected. Then, the drawstring 10 is 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 figure, between the electric poles 1a and 1b, the next between the electric poles is further connected with the drawstring passing tool 6 respectively.
After the pulling ropes are laid between the utility poles by using the above method, if both ends of the respective ropes are jointed, it is possible to pull in a long span at a time. In addition, when the cable is additionally constructed, although not shown, the same applies if the drawstring passing tool 6 is inserted into the diameter of the spiral support 3 in which the messenger wire 2 and the cable are already inserted. The drawstring passing device 6 of the present invention is used for these constructions.

[0020]

When the drawstring passing device of the present invention is used, not only feeding but also drawing is possible.

The use of the drawstring threader of the present invention eliminates the need for dangerous suspension work and allows all work near the utility pole. , Safe and easy to do.

In the drawstring passing device of the present invention, the outer diameter of the elliptical spherical blade portion can be adjusted in advance so as to correspond to the diameter of the spiral support. The cable can be smoothly and smoothly drawn in without difficulty.

[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 schematic side view showing an example of construction using a drawstring passing device.

FIG. 3 is a side view showing one embodiment of a conventional drawstring passing device.

[Explanation of symbols]

 2 Messenger Wire 3 Spiral Supporting Device 6 Pull String Passing Device 7 Conical Tip Conducting Portion 8 Blade Portion 9 Connecting Portion 10 Pulling String Portion 11 Rear End 12 Sleeve 13 Center Wire 14 Male Thread 15 Rod 16 Female Thread 17 Spring D Blade Outer diameter of elliptical sphere L Length of string puller P One pitch of spiral support S Direction of outer diameter of leaf spring T Direction of outer diameter of leaf spring

Claims (2)

[Claims] 1. A drawstring passing device for feeding and drawing a cable into a helical support for hanging a cable stretched between utility poles, wherein a leading end of the drawstring passing device is provided with a conical leading portion. In the rear, a blade portion such as a leaf spring is attached in an elliptical shape around the center wire, and the blade portion is converged at a connection portion at the rear end. Is provided at a rear end of the rod, a spring is provided between a female screw to be screwed into the external thread of the rod and the connecting portion, and a pull cord portion made of a resilient rigid body is provided at a rear end of the rod. A drawstring threader for a spiral support for suspending a cable, the stringer being provided. 2. The drawstring of the spiral support for hanging a cable according to claim 1, wherein the length of the blade portion is at least longer than one pitch length of the spiral support, and preferably longer than two pitches. Threading tool.