JPH09178957A - Chuck type pulling eye for flexible tube for cable protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck type pulling eye for a flexible tube for cable protection capable of easily and quickly inserting and detaching the flexible tube for the cable protection and eliminating the need of manufacturing a traction end. SOLUTION: A traction bolt 1 on which a plate force-fitting part 1a and a ring 1b for a line passing string are mounted is provided on one end. The bolt 1 is inserted to a plate fastening washer 2 and the plate fastening washer 2 is fixed inside a guide sleeve 3. Also, a pair of tapered chuck plates 4a and 4b whose rear inner sides are pierced in a tapered shape so as to make the plate force-fitting part 1a enter deeply are respectively provided movably in an radial direction. The plate fastening washer 2 and a pair of the tapered chuck plates 4a and 4b are inserted to the guide sleeve 3 whose tip part is sharp, a tightening nut 5 is screwed onto the traction bolt 1 and an eyenut 6 for traction is screwed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible tube pulling eye for protecting a chuck type cable.

[0002]

2. Description of the Related Art Conventionally, in the existing small-diameter optical cable accommodating conduit, when a plurality of optical cables are installed, a protective flexible tube for the optical cable is installed.

That is, in order to effectively use an existing underground conduit, when a new optical cable is installed in one conduit containing a small-diameter optical cable, a flexible tube for cable protection is installed, An optical cable is laid in it.

[0004] Generally, a 75 mm pipe is used for the underground pipe, and up to three optical cables may be laid,
In this case, two protective flexible tubes are laid on the existing optical cable.

Therefore, the flexible tube for protecting the optical cable is
It is a tube made of high-density polyethylene, and a line string is inserted to make the cable pulling work efficient.

In the work of laying the flexible tube, a hole is drilled near the mouth end of the flexible tube, a cable tie string is passed through, a cable cap is covered, a vinyl tape is wrapped, and a bent metal piece is further formed. I fixed the binding string and made the tow end.

However, there is a drawback in that the work takes a long time, and the pulling end is damaged during pulling, and the cable is tied off and the cord is disconnected.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention
It was devised to eliminate the above-mentioned drawbacks, and it is extremely easy and quick to insert a flexible tube for cable protection, does not require the production of a pulling end, and is a chuck type cable that is easy to remove. The purpose is to develop a flexible tube pooling eye for protection.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a pulling bolt having a tapered plate press-fitting portion and a wire string ring is provided at one end, and the bolt is inserted into a plate fastening washer and the plate fastening washer is inserted. The washer is fixed in the guide sleeve, and a pair of tapered chuck plates, each of which has a tapered inner hole on the inside of the rear side so as to bite into the plate press-fitting portion, are provided movably in the diametrical direction. The washer and the pair of taper chuck plates are characterized in that they are inserted into a guide sleeve having a sharp tip, and a tightening nut is screwed into the pulling bolt projecting from the guide sleeve, and a pulling eye nut is screwed. It consists of a flexible tube pulling eye for chuck type cable protection.

[0010]

According to the present invention, a wire string (used for inserting a cable into the protective tube) which is inserted through the flexible tube for protecting the cable is tied to the ring for the wire string,
Next, insert the tow bolt into the guide sleeve, and
Insert a plate washer near the tip to protrude from the tip of the guide sleeve, tighten the tightening nut to the protruding traction bolt, and tighten the eye nut for towing at the tip. It is attached and pulled inside the conduit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described in detail with reference to the drawings. A pulling bolt (1) having a tapered plate press-fitting portion (1a) and a wire string ring (1b) at one end thereof ( 1) is provided, the bolt (1) is inserted into the plate retaining washer (2), the plate retaining washer (2) is fixed in the guide sleeve (3), and the rear inner side is
A pair of tapered chuck plates (4a) that are formed in a tapered shape so that the plate press-fitting portions bite into each other.
(4b) are provided so as to be movable in the diametrical direction, and the plate retaining washer (2) and the pair of tapered chuck plates (4a) (4b) are inserted into a guide sleeve (3) having a sharp tip, A flexible tube for protecting a chuck type cable, wherein a tightening nut (5) is screwed onto the pulling bolt (1) protruding from the guide sleeve (3), and a pulling eye nut (6) is screwed onto the pulling bolt (1). It consists of pooling eyes.

Then, the taper chuck plate (4
The outer surfaces of a) and (4b) move in the direction orthogonal to the longitudinal direction in the direction of the tip of the guide sleeve (3) so as to fix the flexible tube (X) for cable protection to the guide sleeve (3). A rugged strip that expands is formed, and at the time of work, the flexible tube (X) for cable protection is fixed, and the work is completed.
When the flexible tube (X) for cable protection is removed, it is formed so as to be easily removed. Further, (Y) is a line string.

[0013]

According to the present invention, a wire string (used for inserting a cable into a protective tube) inserted through a flexible tube (X) for protecting a cable is used as a wire string for a tow bolt. It can be pulled simply by binding it to the work ring (1b), inserting the bolt into the guide sleeve (3), and tightening the tightening bolt. A pair of taper chuck plates (4a) (4b) are located inside the guide sleeve. The tapered plate press-fitting portion (1a) provided on the ring (1b) for wire string is bite into these plates and firmly fixed, and after the work is finished, loosen the tightening nut (5),
By hitting the towing eye nut (6) with a hammer,
The plate press-fitting portion (1a) that is biting into the pair of taper chuck plates (4a) (4b) is easily removed,
The flexible tube for cable protection (X) also comes off from the guide sleeve, and it is not necessary to manufacture the tow end by a troublesome work.
The working time can be shortened, and there are extremely beneficial effects such as efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an assembled state showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounted state of the present invention.

FIG. 3 is a cross-sectional view showing a working state of the present invention.

FIG. 4 is an explanatory view showing a detached state after the work of the present invention is completed.

[Explanation of symbols]

 1 Traction bolt 1a Plate press-fitting portion 1b Passage string ring 2 Plate retaining washer 3 Guide sleeve 4a Tapered chuck plate 4b Tapered chuck plate 5 Tightening nut 6 Pulling eye nut X Flexible tube for cable protection Y Passage string

Claims (1)

[Claims] 1. A pulling bolt equipped with a tapered plate press-fitting portion and a ring for a wire string is provided at one end, the bolt is inserted through a plate retaining washer, and the plate retaining washer is fixed in a guide sleeve. And the inside of the rear is
A pair of tapered chuck plates, each having a tapered shape so as to bite into the plate press-fitting portion, are provided movably in the diametrical direction, and the plate retaining washer and the pair of tapered chuck plates are guide sleeves with sharp tips. And a tightening nut is screwed into the tow bolt protruding from the guide sleeve,
A flexible tube pulling eye for protecting a chuck type cable, which is fitted with a towing eye nut.