JPS5851504Y2 - Hose connection fittings - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a hose connection fitting.

As shown in FIG. 5, the conventional connection fittings for hoses, pipes, etc. have a main body 20 equipped with an annular insertion part 21 and a main body 20.
a presser nut 22 screwed onto the outside of the ring, and an annular insertion portion 21
It consists of a ring 23 that crimply holds the hose inserted into the annular insertion part 21. After the hose is inserted into the annular insertion part 21, the holding nut 22 is tightened to compress and deform the ring 23.
The outer peripheral surface of the hose 24 is crimped and fixed by the changing strain of the ring 23.

Therefore, in the above-mentioned metal fittings, since the hose is crimped by the ring, permanent distortion occurs in the hose due to changes over time, and even if the retaining nut is tightened again, it cannot be tightened, resulting in leakage. .

Therefore, the present invention aims to solve the above-mentioned drawbacks and provide a connection fitting that does not cause leakage over a long period of time. This can be achieved by an improved tightening ring that is attached.

That is, the connecting fitting of the present invention has a main body having a fitting part into which the hose is inserted, and a holding nut having a tapered surface and an annular recess formed at the rear of the tapered surface is screwed on the outside of the fitting part of the main body. It is characterized in that it has a built-in tightening ring that has spring elasticity on the inside of the presser nut and is integrally provided with a hook part for crimping and holding the hose on the inside of the front part.

The shape of the fitting part in the main body of the present invention is a bamboo-shaped nipple part or a stepped hole.The nipple part is suitable for a soft hose, and the stepped hole is suitable for a hard pipe. used.

Hereinafter, embodiments of the present invention will be explained based on the drawings. Fig. 1 shows a connecting fitting for a soft hose, which has a nipple part in which the fitting part into which the hose is inserted is shaped like a bamboo shoot. The connecting piece is composed of a tubular main body 1, a holding nut 2, and a tightening ring 3.

The main body 1 has a tubular shape as a whole, and has a hexagonal spanner engagement part 4 formed on the outer periphery of the central part, and a bamboo-shaped nipple for fitting a hose 15 on one side of the spanner engagement part 4. In addition, a threaded thread 6 is formed on the circumferential surface of the large-diameter cylindrical part adjacent to the fitted part 5, and the presser nut 2 is screwed into this threaded thread 6. It has become.

On the other side of the main body 1, a screw tube 7 for connecting to a device 16 is integrally formed.

The retainer nut 2 has a screw bundle 8 engraved on the inner surface of one side to be screwed together with the screw bundle 6 of the main body 1, and the inner surface of the other side is formed into a tapered surface 9 that gradually becomes smaller in diameter toward the open end side. Furthermore, an annular recess 10 is formed between the tapered surface 9 and the screw bundle 8, and a tightening ring 3 is housed between the inner surface of the holding nut 2 and the outer surface of the fitting portion 5.

The tightening ring 3 is made of hard synthetic resin and is formed into a tapered cylindrical shape, and its large-diameter side mouth part is constricted inwardly, and the mouth edge is made to protrude outwardly so as to come into contact with the rising part 11 at the rear end of the fitting part. The receiver is provided with a portion 12, and the rear half on the large diameter side of the tapered tube is made thin so that spring elasticity acts, and the inner surface of the front half on the small diameter side is provided with a chevron-shaped hook portion 1 for holding the hose 15 against it.
3 is provided protrudingly, and a slit 14 is carved from the receiver part 12 side on the thinner peripheral wall of the rear half of the large diameter side.

When setting a hose to the connecting fitting configured as described above, insert the hose 15 from the fitting part 5 side, and when the tip of the hose 15 hits the front part of the tightening ring 3, the hose 15
When the tightening ring 3 is further inserted against the elastic force of the tightening ring 3, the tightening ring 3 is pushed into the retaining nut 2, and the slit 14 carved in the peripheral wall of the rear half of the cylindrical portion is expanded, and the hose 15 is fitted. It advances to a predetermined position at the rear end of section 5 and stops.

Here, the front hooking part 13 of the tightening ring 3 has a restoring elastic force (
However, since the front inner surface of the presser nut 2 has a tapered surface 9, the hook part 13 is pressed toward the outer peripheral surface of the fitting part 5, and the hose 15 is Press and hold tightly.

The fixing and holding function works to tighten the hose 15 as long as the elastic energy remains in the tightening ring 3.

FIG. 4 shows a connection fitting for a hard pipe, in which an O-ring 18 is fitted on the outside of the pipe fitting part 17 inside the main body 1' to maintain the sealing effect. The configuration is the same as the configuration described above.

The procedure for setting the hard pipe 19 is exactly the same as that for the soft hose 15 described above, and the hard pipe 19 is held under pressure as long as elastic energy remains in the tightening ring 3.

As described in detail above, the connecting fitting of the present invention is made of hard synthetic resin and molded into a tapered cylindrical shape inside the holding nut screwed onto the main body into which the hose (pipe) is inserted, and the large diameter opening is inserted inward. At the same time, the rear part of the tapered cylinder is made thinner, and a slit is carved from the receiver part side in the thin peripheral wall to give spring elasticity, and the inner surface of the front half part on the small diameter side is made thinner. It has a built-in tightening ring with an integrated chevron-shaped hook that holds the hose in its mouth and prevents it from coming off in the pulling direction, so the thin-walled cylindrical portion of the tightening ring is attached to the hose inserted from the fitting side of the main body. The elastic spring force accumulated in the ring acts to pinch and crimp the hose, stopping the hose from coming off.The hose is held in place as long as there is elastic energy remaining in the ring, so the hose will not undergo permanent deformation over time. Even if this occurs, it can be absorbed and a stable tightening condition can be maintained.

Therefore, conventionally, the permanent strain caused by changes over time was covered by the work of re-tightening, but with the present invention, it can be covered by the elastic energy of the tightening ring without having to perform such work at all.

Furthermore, the hoses can be set very easily by simply inserting the hoses as described above, and a connecting fitting with excellent workability can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view showing a connection fitting for a soft hose, and FIG.
3 is a perspective view of the tightening ring, 4 is a partially cutaway front view showing a connection fitting for a hard pipe,
FIG. 5 is a partially cutaway front view showing an example of a conventional connecting fitting. In the figure, 1, 1': main body, 2: holding nut, 3: tightening ring, 5, 17: fitting part, 9: tapered surface, 10: annular recess, 13: hooking part, 15: hose.

Claims (1)

[Scope of utility model registration request] A holding nut having a tapered surface on the inner surface of the front part and an annular recess formed at the rear of the tapered surface is screwed onto the outside of the fitting part of the main body having the fitting part into which the hose is inserted,
On the inside of the holding nut, a hard synthetic resin is molded into a tapered cylindrical shape, and the large-diameter side opening is drawn inward to provide a receiving part, and the rear half of the tapered cylinder is made thin, and the thin peripheral wall is A slit is carved from the side of the receiver to give it spring elasticity, and the inner surface of the front half of the small diameter side holds the hose in its mouth.
``iJ +'' A hose connection fitting featuring a built-in tightening ring with an integrated chevron-shaped hook that prevents it from coming off in the tension direction.