JPH0125835Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used by being incorporated in the middle of piping for various fluids in order to absorb vibrations of fluids, etc. and displacement in the axis and perpendicular directions of the piping line, and the outer periphery is covered with blades. This invention relates to a flexible tube that does not have welded parts at the attachment point between the covered tube and the flange.

For example, as shown in FIG. 2, a conventional flexible tube is equipped with a collar 24 having a flange protruding toward the outer circumference for attaching a flange 23, which is a connecting fitting, to the end of a tube 22 whose outer circumference is covered with a blade 21. However, a structure in which the collar 24 and tube 22 are integrally welded has generally been adopted. However, in the structure described above, not only does the material at the welded part deteriorate and cracks occur during use, but the welding process is time-consuming and requires polishing work to make the weld build-up uniform. This has caused many problems in terms of product quality, manufacturing, and work. Further, the patent application published in Japanese Utility Model Application Publication No. 52-134823, which was previously filed by the applicant of the present invention, was a flexible tube without welded parts. However, in Utility Model Application No. 52-134823, the blade was simply placed inside the flange, so it had the disadvantage that the blade would come out if the flange was not tightened enough.

The present invention was devised in view of the above-mentioned problems and to improve them, and the object is to provide a flexible tube that does not require welding work, has a simple structure, and can form a strong connection. The purpose is to The present invention is a flexible tube in which a flange is fitted onto the outer peripheral surface of the end of a spiral tube whose outside is covered with a blade. On the other hand, a recess is bored in the inner surface of the flange, and the blade is placed in an inner ring having an outer circumferential recess that is prevented from coming off by an annular projection provided at an appropriate position on the spiral tube. The present invention relates to a flexible tube characterized in that the ends of the blade are brought together and forcedly pressed together by an annular outer ring so that the ends of the blade are fitted into the outer circumferential recess in a manner that prevents them from coming off.

The flexible tube of the present invention will be described below with reference to FIG. 1 showing an embodiment. In the figure, 1 is a bellows-like spiral tube that is the main body of the flexible tube, and the entire outside is covered with a blade 2.The end is cut off, fitted into a flange 3 on the outer circumferential surface, and the end is stretched. A washer 5 is interposed on the outer surface of the flange 3, and the front end of the spiral tube 1 is crushed together with the washer 5 to form a collar portion 1a. On the other hand, on the inner surface of the flange 3, a recess 3a is cut into the inner circumference, and the spiral pipe 1 is fitted in advance into the outer peripheral surface of the spiral pipe 1. The end of the blade 2 is placed inside the inner ring 6 which has an outer circumferential recess 6a which is prevented from coming off by an annular convex portion 1b provided at a certain position, and the annular outer ring 7 is attached to the outer circumferential recess of the inner ring 6. It is forcibly pressed and fitted into the blade 6a to prevent the end of the blade 2 from coming off. The outer ring 7 is forcibly pressed before the front end of the spiral tube 1 is pressed to form the flange 1a, and the outer ring 7 is pressed into the outer circumferential recess 6a of the inner ring 6 with the end of the blade attached. 7 are forcibly pressed to fit together, and then the inner ring 6 is fitted into the recess 3a inside the flange 3. After that, a flange 1a is formed at the tip of the spiral tube 1 via a washer 5, and the whole is assembled. It is configured.

Since the flexible tube of the present invention has the above-mentioned configuration and assembly method, there are no welding points that existed in conventional flexible tubes of this type, and there is no need for spiral tube 1 and blade 2.
Even if a force is applied in the direction of withdrawal, the tip of the blade 2 is caught in the outer circumferential recess 6a of the inner ring 6 and is pressed by the outer ring 7, so it will not come out at all and is strong despite its simple structure. The connection state is maintained. In particular, the end of the blade 2 of the present invention has a female-shaped outer circumferential recess 6a of the inner ring 6.
The blade 2 is forcibly pressed between the outer ring 7 and the male outer ring 7, and the annular convex portion 1b has a stronger effect of preventing the blade 2 from coming off than the conventional one. In addition, since there is no welding work, there is no need for skilled workers like in the past, and the number of manufacturing steps is reduced, which reduces the cost of the product.Furthermore, since defective parts caused by welding can be eliminated, the product has a long service life. Therefore, it is possible to provide a flexible tube that has many effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the flexible tube of the present invention, and FIG. 2 is a partially cutaway front view of a conventional flexible tube. 1... Spiral tube, 1a... Flange, 2... Blade, 3... Flange, 3a... Recess, 5...
Washer, 6...inner ring, 6a...outer periphery recess.

Claims (1)

[Scope of utility model registration request] Spiral tube 1 whose outside is covered with a blade 2
In a flexible tube formed by fitting a flange 3 into the outer peripheral surface of the end thereof, a washer 5 is interposed on the outer surface of the flange 3 and the front end of the spiral tube 1 is crushed to form a flange 1a. A recess 3a is bored in the inner surface, and an annular projection 1b is provided at an appropriate position of the spiral tube 1 within the recess 3a.
The end of the blade 2 is placed inside the inner ring 6, which has an outer circumferential recess 6a, which is prevented from coming off by the annular outer ring 7. A flexible tube characterized in that the parts are fitted together to prevent them from coming off.