JPH085445Y2 - Split line pulling terminal - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In some cases, an optical cable may be additionally installed in an underground conduit in which an optical cable has already been installed.

In such a case, generally, a method of laying one thin pipe-shaped divided pipe line in the pipe line and drawing a cable therein is adopted.

The present invention relates to a pulling terminal used when laying a single divided pipeline in an underground pipeline as described above, and has a small outer diameter and is capable of obtaining a required pulling force. Is.

[Prior Art and Its Problems] An example of additionally installing only one divided pipeline as described above has not been seen until now, but when four divided pipelines are collectively installed, for example, As shown in Figure 6.

That is, the cutout 12 is formed so that the pulling end of the divided pipeline 10 does not become thick, the iron wire 14 is used to tighten and the iron wire 16 is pulled, and the split pipeline 10 is drawn into the underground pipeline 11.

However, if this method is applied to one case, the notch
The stress concentrates on 12 and the tensile force is insufficient.

[Means for Solving Problems] The present invention is, as shown in FIGS. 1a and 1b, (1) a cylindrical body made of a high-strength, hard material whose inner diameter is equal to the outer diameter of the divided conduit 10. 20 and (2) a wedge 22 having a cylindrical portion 26 at least a part of the outer diameter of which is slightly larger than the inner diameter of the divided conduit 10, and (3) fixed or connectable to the front end of the wedge 22. The above problem is solved by using a pulling terminal composed of a flexible eye rod 40 and.

[First Embodiment] -Structure: In FIG. 1a, 20 is a main body.

It is made of a hard and high strength material such as stainless steel.

The main body 20 has a thin-walled cylindrical shape, and its inner diameter a is substantially equal to the outer diameter b of the divided conduit 10.

The inner surface of the main body 20 is provided with, for example, female screw-shaped irregularities so as to make the engagement with the divided conduit 10 stronger.

 22 is the whole wedge.

The rear portion (see arrow 21) has a tapered portion 24, the front portion thereof is a cylindrical portion 26, and the front portion thereof is a brim 28.

The outer diameter c of the cylindrical portion 26 is slightly larger than the inner diameter d of the divided conduit 10. The outer diameter of the collar 28 is equal to the outer diameter of the main body 20.

 The eye rod 40 is fixed to the front surface of the brim 28.

-Operation As shown in Fig. 1b, the main body 20 is externally fitted to the end of the divided conduit 10, and the wedge 22 is press-fitted into the divided conduit 10 by hitting it with a hammer, for example.

Then, the iron wire 16 is connected to the tip of the eye rod 40 and pulled.

[Second Embodiment] -Structure: The eye rod 40 is detachable.

As shown in Fig. 2, the piece caught on the rear part of the eye rod 40
Fix 44. The catching piece 44 has, for example, a square thick plate shape. 46 is a screw and 48 is a nut.

On the other hand, as shown in FIGS. 3a and 3b, holes 30 are formed in the wedge 22 in the front-rear direction. Note that FIG. 3a shows a cross section taken along the line AA of FIG. 2, and FIG. 3b shows a cross section taken along the line BB.

This hole 30 consists of the following parts. That is, 32 part: a square hole having a flat cross section through which the catching piece 44 can pass.

 34: A hole through which the eye rod 40 can pass.

The central axis of this hole coincides with the central axis of the above-mentioned 32 parts, and they are partially common.

Part 36: This is provided only in the rear part of the wedge 22.
The above-mentioned 32 is a square having a flat cross section at a right angle.

The catching piece 44 can be inserted into this from the rear.

-Operation (1) As shown in Fig. 4a, the main body 20 is externally fitted to the end of the divided conduit 10 and the wedge 22 is press-fitted into the divided conduit 10 (the same as the first embodiment up to this point).

(2) Wedge the eye rod 40 with the hooking piece 44
Thread through hole 30 in 22 (Fig. 4b) and then rotate 90 ° (Fig. 4c).

(3) Put the eye rod 40 back slightly forward and catch it.
Fit 44 into 36 of hole 30 (Fig. 4d) and tighten nut 48 (Fig. 4e).

 After that, the process is similar to that of the first embodiment.

(4) If it is necessary to protect the existing cable, as shown in Fig. 5, connect the front of the wedge 22 to the eye rod 40.
Then, attach the PVC cap 50.

-Advantages peculiar to the second embodiment: When driving the wedge 22 into the split conduit 10, the eye rod
Since 40 is not fixed, it is easy to drive and there is no need to worry about bending the eye rod 40 or crushing the head of the eye rod 40.

[Advantages of the Invention] (1) As described above, when the main body 20 is externally fitted to the end of the divided pipeline 10 and the wedge 22 is press-fitted into the divided pipeline 10, the divided pipeline 10 may spread outward. If it is not deformed, the wedge 22 and the end of the divided conduit 10 are integrated.

Therefore, by pulling the eye rod 40 that is fixed to the front end of the wedge 22 or can be connected, the split conduit 10
It is possible to stably apply the pulling force required for.

(2) It is not necessary to provide the notch 12 in which the stress is concentrated at the end of the divided conduit 10 as in the conventional case.

(3) Since the outside diameter of the pulling terminal is small, even if many cables have already been laid in the underground pipeline and the remaining gap is small, the split pipeline can be pulled in without damaging the cable. be able to.

[Brief description of drawings]

1a is an exploded view of the first embodiment of the present invention, FIG. 1b is an illustration of its operation, FIG. 2 is an illustration of a second embodiment of the present invention, and FIG. 3a is FIG. FIG. 3b is a sectional view taken along the line BB of FIG. 2, FIG. 4a, FIG. 4b, FIG. 4c, FIG. 4d, and FIG. 4e show the operation of the second embodiment. FIG. 5 is an explanatory view showing in order, and FIG. 5 is an explanatory view in a state where the cap 50 is attached. FIG. 6 is an explanatory diagram of a conventional technique. 10: Split pipe, 11: Pipe 12: Notch, 14, 16 Iron wire 20: Main body, 22: Wedge 24: Tapered portion, 26: Cylindrical portion 28: Collar, 30: Hole 40: Eye rod, 44: Hook piece 46: Screw, 48: Nut 50: Cap

Claims (2)

[Scope of utility model registration request] 1. High strength, whose inner diameter is equal to the outer diameter of the divided conduit,
A cylindrical body made of a hard material, a wedge having a cylindrical portion of which at least a part of the outer diameter is slightly larger than the inner diameter of the divided conduit, and fixed or connectable to the front end of the wedge A pulling terminal for a divided conduit, which comprises an eye rod and. 2. An eye rod is for fixing a hooking piece to a rear end thereof, and a hole is provided in the wedge into which the eyepiece with the hooking piece can be inserted, and the eyerod with the hooking piece is inserted in the hole. When the eye rod is inserted and rotated around its axis, the catch piece is caught by the wedge so that it cannot be pulled out forward. Pulling terminal for the described divided conduit.