JPS5829340Y2 - Plastic hose fittings - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a metal fitting for a plastic hose that is used by being connected integrally with the end of a plastic hose.

As shown in Fig. 1, the central part is formed into a hexagonal surface part I, a threaded part 8 is formed on the -end side, and an insert part 9 that can be inserted into the end of the hose is formed on the other end side. The socket fitting 11 is arranged on the outer periphery of the tube body 10 and the insert part 9 in opposition to each other.
1 to the threaded part 12 of the main body 10 and the threaded part 1 of the socket part 11.
Plastic hose fittings are generally used which have an integrated structure by screwing two parts together.

However, in such a hose fitting, the threaded portion 12
．． 13 is not necessarily necessary, but preferably the threaded portion 12.
If you want to remove the processing of 13, then the entire hose fitting will be shortened by the length of the threaded part 12 (or 13), and for that purpose, if you connect the hose end there and integrate it,
The hose portion becomes longer, which is particularly advantageous for fastening a short hose to a hose fitting, and the flexibility of the plastic hose, which is relatively hard compared to rubber, can be effectively utilized.

Further, since the tube body 10 is made from a hexagonal material to form the serrated step portion 14, and the socket 11 is also made from a round bar material, the amount to be removed is large, resulting in wasted material costs and processing time.

Furthermore, there is a risk that the internal fluid may leak due to loosening between the threaded portions 12 and 13 during use.

For this reason, although not shown in the drawings, there is a hose fitting in which a socket part and an insert part are integrally provided in the connecting pipe main body, and a hose insertion gap is formed by the socket part and the insert part. There is a drawback that it is difficult to form an engagement step on the circumferential surface and the outer circumferential surface of the insert part. Since it is used without forming a step, it has the disadvantage that the hose is very easy to remove.

In addition, plastic hoses have various advantages over rubber hoses (for example, they are lightweight, chemical resistant, have a simple manufacturing process, and are easy to work with), so they have recently been gaining popularity. Although it tends to be used more frequently, if this stepped section of the plastic hose is integrated with a hose fitting as described above and used for a long period of time or repeatedly in applications such as high-temperature forward flow fluids, the socket section of the hose fitting will The hose part that is being compressed is generally thermoplastic, so it becomes soft and the tension (internal stress) of the hose itself decreases when it is compressed. There is a drawback that liquid leakage occurs.

Therefore, it is clear that the structure of the metal fittings described above alone cannot sufficiently prevent liquid leakage caused by the influence of such thermal history, and improvements are desired.

Taking these points into consideration, this idea was developed not only to reduce material costs and processing costs by changing the hose fittings, but also to reduce the risk of fluid leakage due to the hose itself becoming difficult to pull out. The purpose is to provide a metal fitting for a plastic hose that is less likely to cause damage, and its gist is to provide a metal fitting for a plastic hose in which a socket part 2 and an insert part 3 are integrally provided on a connecting metal pipe 1. , the inner peripheral surface of the socket part 2 and the insert part 3
A metal sleeve 6 having an uneven portion is disposed on at least one of the outer circumferential surfaces of the metal sleeve 6 with an elastic member 5 interposed therebetween.

An embodiment of the hose fitting of this invention will be described below with reference to the drawings. In Fig. 2, 1 is a connecting metal body,
A threaded portion 8 is formed on one outer periphery of the hexagonal surface portion 1, and a socket portion 2 and an insert portion 3 are integrally formed on the other side, forming a gap into which a hose end can be inserted.

In this case, the connecting metal body 1 only needs to be machined from a single hexagonal body, which has the advantage of reducing material costs and shortening machining time.

Reference numeral 4 denotes a cylindrical elastic member, which is fitted onto the outer circumferential surface of the insert portion 3 .

Reference numeral 6 denotes a metal sleeve on which a concavo-convex portion 5 is formed, and is fitted onto the outer circumferential surface of the elastic member 4.

In this case, the elastic member 4 and the metal sleeve 6 are simply arranged in a fitted manner, but it is also possible to arrange the elastic member 4 and the metal sleeve 6 in a state where 4 and 6 are arranged, or 3 and 4 are integrated with each other via an adhesive or the like. If you do this, it will be even more difficult to remove the end of the plastic hose.

It is also possible to arrange 4 and 6 on the inner circumferential surface of the socket portion 2.

When a device with such a configuration is actually inserted into the end of a plastic hose and integrated by compression, the metal sleeve 6
The uneven portion 5 bites into the inner layer of the hose, making it difficult for the hose itself to come off.

Moreover, the compressed plastic hose end of the hose fitting becomes soft due to the influence of heat passing through the hose.
Even if the tension force (internal stress) on the inner circumferential surface of the socket portion 2 or the outer circumferential surface of the metal sleeve 5 decreases, the elastic member 4 will cause the metal sleeve 5 to move in the radial direction due to the elastic force (compressive stress) applied when the socket portion 2 is compressed. Since the inner and outer circumferential surfaces of the plastic hose end are held in strong pressure contact with the outer circumferential surface of the metal sleeve 6 and the inner circumferential surface of the socket part 2,
Since the elastic member 4 compensates for the decrease in internal stress, it has the effect of sufficiently preventing leakage of internally circulating fluid at all times.

FIG. 3 shows another embodiment, in which a ring-shaped groove 16 with a concave cross section is formed on the insert side of the metal sleeve 15, and an elastic member 4 is disposed in the concave portion.

Such a configuration is advantageous in the case of an elastic member with poor liquid resistance because the internally circulating fluid does not come into direct contact with the elastic member 4.

As described above, according to the hose fitting of this invention, it is possible to save material costs and processing costs during manufacturing, prevent the hose from being unplugged during use, and prevent leakage of internally circulating fluid, etc., all at once. Practical value is a dog.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of a conventional hose fitting. FIG. 2 is a partially cutaway sectional view of one embodiment of the hose fitting of this invention, and FIG. 3 is a cutaway sectional view of essential parts of another embodiment of the hose fitting of this invention. 1: continuous metal tube, 2: socket part, 3, 9: insert part, 4: elastic member, 5, 15: metal sleeve, 6: uneven part, 7: hexagonal part, 8.12.13: threaded part, 10: Pipe body, 11: Socket fitting, 14: Serrated step.

Claims (1)

[Scope of utility model registration request] A socket part 2 and an insert part 3 are integrally provided on a connecting metal pipe 1, and the inner circumference of the socket part 2 and the outer circumference of the insert part 3 are attached to the hose fitting which is integrated with the end of the plastic hose. A fitting for a plastic hose, characterized in that a metal sleeve 6 having an uneven portion 5 is disposed on at least one of the surfaces via an elastic member 4.