JPH0131431Y2 - - Google Patents

Description

[Detailed explanation of the invention] ● Industrial application field This invention uses a traction wire to install a corrugated metal pipe (flexible pipe) inside a sheath pipe that has already been piped when installing indoor gas piping. The present invention relates to a tool for connecting a corrugated pipe and a pulling wire used for pulling.

● Conventional technology and its problems Conventionally, cast iron pipes or steel pipes have been used for indoor gas piping, but these piping costs a lot of money and labor, and in the case of new construction, other construction work is required. There was a problem in that it took time to coordinate arrangements with related parties.

Therefore, recently, similar to indoor construction of electrical or telephone lines, sheath pipes (often plastic pipes) are installed in advance inside the gas piping system, and after the interior work such as floors and walls is completed, the sheath pipes are installed inside the sheath pipes. A gas pipe construction method has been developed and put into practical use, in which a metal flexible pipe is pulled in and used as a gas pipe.

Since the conventional flexible pipe is a spiral pipe made of metal, the pulling wire and the flexible pipe are connected by screwing a threaded cone into the flexible pipe.
The use of such a spiral tube has the drawback of high cost, and recently, inexpensive single-wave type (single-crest type) tubes have been used.

Therefore, in the case of a single waveform, the coupling method of screwing in the cone cannot be used, so
A proposal for a coupling method in this case is requested.

● Purpose of the present invention The purpose of the present invention is to propose a tool that can easily connect a pulling wire to the tip of a single-corrugated flexible pipe when pulling it into a sheath pipe. .

● Structure of the present invention In order to achieve the above object, the present invention has an inner cone formed by forming an enlarged part at the tip of the shaft, forming a connecting part with the traction tool at the upper end, and attaching a stopper in the middle. , a tapered surface into which the enlarged part of the inner cone fits from below and a fitting part are formed on the inner surface of the lower end, a convex part is formed on the outer peripheral surface, a split groove is inserted from the tip side, and the inner cone is formed in the center. A tool for drawing a corrugated tube into a sheath tube is proposed.

When using the above tool, first insert the shaft of the inner cone into the hole of the outer cone, and in this state insert the convex part of the outer cone into the cut end of the corrugated pipe.
Next, the shaft portion of the inner cone is pulled to raise the enlarged portion along the tapered surface, and the enlarged portion is fitted into the fitting portion so that the inner cone is prevented from slipping out by the stopper. You can tie the traction wire to the joint of the inner cone in advance, or you can tie it afterwards, but it is best to push the end of the traction wire tied to the joint into the piping sheath and make sure it comes out from the other end. The piping is carried out by pulling the corrugated tube into the sheath tube by hand.

● Embodiment Figures 1 and 2 show an embodiment of the present invention, in which 1 has an enlarged part 3 formed at the tip of the shaft part 2, a connecting part 1a with a traction tool at the upper end, and a stopper 4 in the middle. It is an inner cone made by attaching a.

5 is a tapered surface 7 into which the enlarged portion of the inner cone fits from below on the inner surface of the lower end, and a fitting portion 8 that follows the tapered surface 7;
This is an outer cone having a convex portion 6 formed on the outer circumferential surface, a split groove 10 inserted from the tip side, and a hole 9 provided in the center through which the shaft portion 2 of the inner cone 1 passes.

An example of the use of the tool having the above structure will be explained based on FIG. 3.

First, insert the shaft part 2 of the inner cone 1 into the hole 9 of the outer cone 5 from below and pull it up, tie the pulling wire d to the joint part 1a, and insert the convex part 6 of the outer cone 5 into the cut end b of the corrugated tube a. insert.

Next, the traction wire d or the shaft part 2 of the inner cone 1
When pulled upward, the enlarged part 3 becomes the tapered surface 7
During this upward movement, the convex part 6 of the outer cone 5 is expanded in the outer circumferential direction by the action of the groove 10, and the enlarged part 3 is accommodated in the fitting part 8 while maintaining this expansion.

As a result, the convex part 6 of the outer cone 5 fits into the convex part c in the corrugated tube a from the inside, and does not come out.

Once the tool has been installed, push the end of the pull wire d into the sheath pipe e that has already been piped, and pull the part that comes out from the other end by hand to draw the corrugated pipe a into the sheath pipe e. It is used to perform piping. When the retraction is completed, remove the stopper 4 and push down the inner cone 1. As the enlarged part 3 escapes from the fitting part 8 downward via the tapered surface 7, the convex part of the outer cone 5 6 shrinks due to its elastic action and easily escapes from the corrugated tube a.

● Effects of the present invention As described above, the present invention is achieved by inserting the shaft portion 2 of the inner cone 1 into the outer cone 5, pulling up the inner cone 1, and raising the enlarged portion 3 along the tapered surface 7. The tool of the present invention can be easily installed within the cut end of the corrugated tube a by expanding the portion 6 in the outer circumferential direction. The enlarged part 3 fits into the fitting part 8, and the stopper 4 fixes the inner cone 1 so that it does not come out. Therefore, the tool (outer cone 5) is never removed from the convex part c of the corrugated tube a. There's no need to worry about it coming off.

Furthermore, after piping is completed, simply removing the stopper 4 from the inner cone 1 and pushing the inner cone 1 downward will reduce the convex portion 6, making it easy to remove the tool from the corrugated pipe a. be.

[Brief explanation of the drawing]

Fig. 1 is an isolated perspective view of the outer cone and inner cone according to the present invention, Fig. 2 is a perspective view of the inner cone incorporated into the outer cone, and Fig. 3 is an example of how the tool of the present invention is attached to a corrugated pipe. It is an explanatory diagram. 1...Inner cone, 2...Shaft portion, 3...Enlarged portion, 4...Stopper, 5...Outer cone, 6...
... Convex portion, 7... Tapered surface, 8... Fitting portion, 9...
...hole, 10... split groove.

Claims (1)

[Claims for Utility Model Registration] An inner cone formed by forming an enlarged part at the tip of the shaft part, forming a connecting part with the traction tool at the upper end, and attaching a stopper in the middle, and an enlargement of the inner cone on the inner surface of the lower end. A convex portion is formed on the outer circumferential surface, a split groove is inserted from the tip side, and a hole is provided in the center through which the shaft portion of the inner cone passes. A tool for drawing an outer cone consisting of and a corrugated tube consisting of into the sheath tube.