JPH039787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a wire passage device for a small diameter pipe line including a bent portion.

Conventional technology In conventional gas pipes and water pipes, linings are being applied to branch pipes branched from the main pipe for the purpose of preventing rust or leakage. In many cases, it is necessary to run wires into branch pipes as a preliminary operation. However, such branch pipes usually have a small diameter of about 20 to 60 mmφ and have about 5 to 10 bends consisting of elbows (or bends) in the middle, so it is difficult to pass them with a normal wire passing machine. There were many cases where the line could not be lined up, which hindered work.

Problems to be Solved by the Invention The present invention has been made for the purpose of eliminating such conventional problems.

Means for Solving the Problems The present invention includes a spring wire that is inserted into a small-diameter conduit including a bent path, and a guide provided at the tip of the wire. It has a length approximately corresponding to the length of the central axis, and is composed of guide balls disposed at both ends and at least one in the middle, and coil springs that sequentially connect the guide balls. The coil spring has a spring force slightly weaker than that of the spring wire, and the guide ball has a diameter slightly smaller than the inner diameter of the pipe. Related to wire fittings.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

The wire passing tool of the present invention includes a spring wire 1 inserted into a small-diameter pipe including a bent path, and a guide 2 provided at the tip of the wire 1.

As the spring wire 1, various types of flexible wires with spring performance, such as those conventionally used for cleaning piping, can be used. For example, a so-called snake wire composed of one or more layers of coil springs can be used. .

For example, as shown in FIGS. 1 and 2, the spring wire 1 is stored in a wound state in a rotating container 4 rotatably supported by a frame 3, and is freely drawn out. can be transported,
Convenient for storage. The wire 1 can be twisted by rotating the rotary container 4 with the rotary handle 7 while the wire 1 is chucked by the chuck mechanism 6 provided at the drawer opening 5. Even if the wire 1 is stored and fed out manually as shown in Figure 1,
Alternatively, it may be of an automatic operation type as shown in FIG. In the case of the automatic operation type shown in FIG.
It is provided in a. In the figure, 10 is a guide roll. The wire 1 may be inserted into the tube by twisting it directly by hand.

Details of the guide 2 are shown in FIG. The guide 2 has a length that approximately corresponds to the length l of the central axis of the bent path b of the conduit a (see Fig. 4), and has guide balls 21 and 21' arranged at both ends and a middle portion. It consists of a guide ball 22 arranged at at least one location, and further coil springs 23 and 24 that sequentially connect the guide balls 21, 21' and 22. Although the figure shows a case in which one guide ball 22 is provided as the intermediate guide ball 22, about two to three guide balls may be provided.

The coil springs 23 and 24 that connect the guide balls 21, 21' and 22 need to have a spring force slightly weaker than that of the spring wire 1, which is usually equivalent to about 60 to 80% of the spring force of the wire 1. A spring force (spring constant) is used.
Further, it is preferable that the spring force of the springs 23 and 24 is set to be slightly lower as the tips end.

As the guide balls 21, 21' and 22, the pipe a
The diameter of the guide ball 21', which is directly connected to the wire 1, may be smaller than this by about 1 to 3 mm. The guide 2 may be detachably connected to the tip of the wire 1 by a suitable coupling (not shown).

FIG. 4 shows the guide 2 at the bend b of the pipe a.
The situation at the time of passage is shown.

Of the guide balls in guide 2, the most advanced guide ball 21
The coil spring 2 that follows the bending part b easily overcomes the unevenness on the inner surface of the bending part b when passing through the bending part b.
3 and 24 are smoothly bent along the bending part b.

In addition, the intermediate guide ball 22 and the proximal guide ball 2
1' is the coil spring 23 and 2 in the bent part b.
Perform centering in step 4.

For example, if there is no intermediate guide ball 22, the coil spring 25 between the guide balls 21 and 21' will meander within the bend b, as shown in FIG. 5, which will not only increase the resistance inside the pipe but also reduce the pushing force. I will do it.

In addition, if there is no guide ball 21' at the proximal end, the guide balls 21 and 22 will be too close together as shown in FIG.
The spring wire 1 is bent and gets stuck in the bent portion b, and the pushing force is not sufficiently transmitted to the distal end.

On the other hand, when the guide balls 21, 21' and 22 are provided at both ends and the middle part as in the present invention, the coil springs 23 and 24 are smoothly bent along the bending part b as shown in FIG. As a result, the pushing force from the wire 1 can be efficiently transmitted to the leading guide ball 21.

Furthermore, when passing through the bending part b of the guide 2, the wire 1 is twisted and the most advanced guide ball 2
It is necessary to make 1 take a swinging motion.

In the present invention, in order to transmit the twist of the wire 1 to the most advanced guide ball 21, coil springs 23 and 24 having a spring force slightly weaker than that of the wire 1 are used. By using 24, wire 1
The twist can be efficiently transmitted to the most advanced guide ball 21 via the coil springs 23 and 24. For example, if the coil springs 23 and 24 have a stronger spring force than the wire 1, the twisting of the coil springs 23 and 24 will be poor, while if it is too weak, the twist will be sufficient but the repulsive force will decrease, and eventually It is also not preferable.

As for the coil springs 23 and 24, it is preferable to use coil springs whose spring constants gradually become smaller as the tip ends.

In the present invention, the guide 2 can exhibit an extremely excellent guiding function as a whole due to the action of the guide balls 21, 21' and 22 and the coil springs 23 and 24 that connect them. ~
The purpose of wiring can be sufficiently achieved even for a small-diameter pipe line with a diameter of 60 mm and about 5 to 10 bends in the middle.

Effects of the Invention According to the wire threading tool of the present invention, it is possible to easily achieve the purpose of wire threading even in small-diameter pipes with bent parts, which was considered difficult in the past, and it is useful for lining the inner surface of branch pipes. It is extremely useful when applied to wires that can be used.

[Brief explanation of the drawing]

1 and 2 are vertical cross-sectional views showing different embodiments of the present invention, FIG. 3 is a partial vertical cross-sectional view showing an enlarged main part of the wire threading tool of the present invention, and FIG. 4 is a vertical cross-sectional view showing different embodiments of the present invention. FIGS. 5 and 6 are vertical cross-sectional views showing the wiring situation at the pipe bending part in a comparative product. In the figure, 1 is a spring wire, 2 is a guide, 21, 21' and 22 are guide balls, 23, 24
is a coil spring.

Claims (1)

[Claims] 1 A spring wire 1 inserted into a small-diameter conduit a including a bent path b, and a guide 2 provided at the tip of the wire 1, the guide 2 being connected to the central axis of the bent part b of the conduit a. Guide balls 21, 21' and 2 having a length approximately corresponding to the length of
2, and a coil spring 2 that sequentially connects the guide balls.
3 and 24, the coil spring 2 of the guide 2
3 and 24 apply a slightly weaker spring force than the spring wire 1, and guide balls 21, 21' and 22
A wire passing tool for a small-diameter conduit including a bent conduit, characterized in that each has a diameter slightly smaller than the inner diameter of the conduit a.