JPS5952317B2 - flexible hose - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hose that is extremely strong compared to conventional hoses made only of resin, lighter and more flexible than hoses made only of rubber. This is what we intend to provide.

First, an embodiment of the present invention will be described based on the drawings. An outer peripheral wall part 2 made of a soft resin material such as soft vinyl chloride is integrally joined to an inner peripheral wall part 1 made of a rubber material. The outer circumferential wall 2 has a chevron shape with fins on both sides, and a soft resin strip 2a with a hard reinforcing material 3 such as hard vinyl chloride (or a metal wire may be used) embedded therein is attached to the fins at both ends. It is constructed by winding the pieces spirally so that they overlap each other and welding them together.

Note that this flexible hose includes a rubber strip 1a formed by extruding a rubber material mixed with a vulcanizing agent, for example, and
By extruding a soft resin material while embedding a linear hard reinforcing material 3a inside, the soft resin strip 2a is formed, and the two are thermally welded to each other in a semi-molten state, and then wound spirally. In each of the strips 1a and 2a, the end faces of adjacent ones are heat-welded to each other, and the rolled rubber strip 1a is heated at least from the inside to vulcanize and molecules enter each other. It was manufactured by changing the state to

As the rubber material, polysulfide rubber containing 40 to 80% sulfur (for example, T polymer) is preferable. In short, in the flexible hose according to the present invention, the inner circumferential wall 1 is made of a rubber material, the outer circumferential wall 2 is made of a soft resin material, and the outer circumferential surface of the outer circumferential wall 2 is formed into a corrugated shape. In a flexible hose, a rubber band 1a is placed on the inside, and a soft resin band 2a with a chevron-shaped cross section and a hard reinforcing material 3 embedded inside is wound spirally on the outside. The present invention is characterized in that the peripheral wall portions 1 and 2 are integrally formed by thermal welding in a state in which they are heated, and has the following advantages.

In other words, by making the inner layer made of rubber and the outer layer made of soft resin, it exhibits sufficient oil resistance and extremely high pressure resistance against internal pressure, and is also lighter and more flexible than when the gold layer is made of rubber. By taking advantage of the fact that the outer layer of the soft resin strip covers the drawback that rubber material strips have excellent flexibility and are difficult to form into complex cross-sectional shapes, it is easy to simultaneously add hard reinforcing materials inside the outer layer. By extrusion molding, the hose is wound spirally while being extruded, making it possible to obtain the above-mentioned hose with ease of manufacture.

In particular, since the chevron-shaped soft resin band with the hard reinforcing material embedded therein is wound around the inner layer formed of the rubber band, the hard reinforcing material can be held well. By making the outer circumference of the entire hose corrugated, flexibility is further improved, and the expansion and contraction of the entire hose can be shared by the outer peripheral wall, so the inner peripheral wall between the soft resin strips can be The expansion and contraction is concentrated locally and does not cause fatigue.

Furthermore, by providing a peripheral wall portion that is integrated by heat welding while the strips are spirally wound together, the inner layer made of the rubber strip and the soft resin strip are combined. The hose is highly integrated with the outer layer, and the two layers do not separate, making it possible to provide a highly durable hose.

[Brief explanation of the drawing]

The drawing is a partially cutaway front view showing an embodiment of the flexible hose according to the present invention. 1...Inner circumferential wall portion, 2...Outer circumferential wall portion, 3...Hard reinforcing material.

Claims (1)

[Claims] 1. A flexible hose in which the inner circumferential wall 1 is made of a rubber material, the outer circumferential wall 2 is made of a soft resin material, and the outer circumferential surface of the outer circumferential wall 2 is formed into a corrugated shape, and the inner side is made of rubber. A soft resin strip 2a having a chevron-shaped cross section with a strip 1a embedded inside a hard reinforcing material 3 on the outside.
The flexible hose is provided with the circumferential wall portions 1 and 2 which are integrally formed by heat welding while the two are spirally wound together.