JPS6025027Y2 - pressure hose - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an antistatic pressure hose in which two types of reinforcing bodies and an antistatic metal wire are embedded in the hose wall.

(Prior art and its problems) Conventionally, a method of embedding a metal wire such as a steel wire in a spiral shape within the wall of a rubber or synthetic resin hose to prevent the hose from being charged is disclosed in Japanese Utility Model Publication No. 48-9217. Most hoses have antistatic metal wires embedded between the pitches of a hard helical reinforcing body embedded in a soft hose wall, as is generally known and described in publications and the like, as shown in FIG.

However, when this hose is repeatedly bent to a small bending radius, as shown in FIG. In contrast, the metal wire 2 has no elasticity and does not expand, so there is a problem in that the hard hose wall is brought into tension downwardly (in the direction of the arrow) and is cut, causing cracks.

On the other hand, in order to exhibit excellent strength against internal and external pressure, the hose is made of rubber or synthetic resin and is made of a spiral reinforcement made of metal or hard synthetic resin and threads formed in a braid or mesh shape within the wall of the hose. A hose with embedded fiber reinforcing material and two types of reinforcing bodies to strengthen its pressure resistance was published in Japanese Patent Application Laid-open No. 52
As is known from Japanese Patent No.-137717, it is necessary to prevent the hose from being charged with electricity even in this type of hose.

In this case, if the antistatic metal wire is inserted between the pitches of the spiral reinforcing body as in the example shown in Figure 1, similar problems such as cutting of the hose wall will occur. There was a problem in that the fiber reinforcing material used was wasted and losses due to hose breakage increased.

(Technical problem of the invention) The technical problem of this invention is to solve the above problems.
It is an object of the present invention to provide a pressure-resistant hose that can increase the pressure resistance of the hose and at the same time prevent charging without causing any problems.

(Means for solving the problem) In order to solve the above-mentioned problem, the present invention has a spiral reinforcement body,
The embedded positional relationship of the reinforcing fiber layer and the antistatic metal wire inside the soft hose wall has been devised, and the hard spiral reinforcement is buried inside the soft hose wall, and the embedding position of the hard spiral reinforcement is radially inward from the buried position of the hard spiral reinforcement. Alternatively, in a pressure-resistant hose with an outward reinforcing fiber layer, antistatic metal wires are spirally buried in the radially intermediate portion between the hard helical reinforcement and the reinforcing fiber layer at the same pitch as the hard helical reinforcement. The technical stage is to enter the

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, a spiral reinforcing body 3 made of a hard synthetic resin and a reinforcing fiber layer 4 made of threads braided into a mesh are embedded in a hose wall 1 made of a soft synthetic resin.
The latter 4 is located radially inward from the buried position of the former 3.

Reference numeral 2 denotes an antistatic metal wire made of copper wire or the like, which is inserted into the hose wall 1 between the helical reinforcing body 3 and the reinforcing fiber layer 4 in the radial direction without making it contact with both the helical reinforcing body 3 and the reinforcing fiber layer 4. It is embedded in a spiral shape with the same pitch as 3.

FIG. 3 shows another embodiment in which the metal wires 2 embedded in the radially intermediate portion between the helical reinforcement 3 and the reinforcing fiber layer 4 are arranged at the same pitch as the helical reinforcement 3. (b) one embedded in contact with the inner surface of the spiral of the helical reinforcing body 3; (C) both 3, 4
The implants are shown in contact with both sides.

FIG. 4 shows still another embodiment, in which a mesh-like reinforcing fiber layer 4 is embedded in the soft synthetic resin hose wall 1 radially outward from the embedded position of the hard synthetic resin spiral reinforcement 3. Antistatic metal wires 2 are embedded in the radially intermediate portion between the helical reinforcement 3 and the reinforcing fiber layer 4 at the same pitch as the helical reinforcement 3 as shown in a to d. There is.

That is, a is the one in which the metal wire 2 is enlarged without contacting the reinforcing fiber layer 4 and the spiral reinforcement 3, b is the one in which the metal wire 2 is embedded in the reinforcing fiber layer 4 in contact with it, and C. d indicates that the metal wire 2 is embedded in contact with the outer surface of the helical reinforcing body 3, and d indicates that the metal wire 2 is embedded in contact with both the reinforcing fiber layer 4 and the helical reinforcing body 3. ing.

In the above-described embodiments, the fiber reinforcing layer 4 is not limited to the one formed by braiding filaments into a mesh shape, but may be formed by arranging or weaving the filaments in the axial direction.

(Operation and Effect of the Invention) As explained above, in the present invention, even if the hose is bent and the hose wall 1 at the bent portion expands in the radial direction, the metal wire is in tension contact with the hose wall. Since the helical reinforcing body 3 or the reinforcing fiber layer 4 is always embedded in the portion where the soft hose wall is cut over the entire length of the hose, it is possible to prevent the metal wire from cutting inside the soft hose wall.

That is, in the case shown in FIGS. 2 and 3, the reinforcing fiber layer 4 is located immediately inside the metal wire 2 (lower part in the figure) in the large diameter portion 1a of the bent portion, and In the portion 1b, the helical reinforcing body 3 is located just outside the metal wire 2 (lower in the figure), thereby preventing the metal wire from cutting or damaging the inside of the soft hose wall.

Moreover, in the embodiment shown in FIG. 4, contrary to the above case, the spiral reinforcement 3 is located immediately inside the metal wire 2 in the large diameter part of the bent part, and the metal wire 2 is located in the small diameter part of the bent part. Since the reinforcing fiber layer 4 is located just outside the hose wall, it is possible to similarly prevent the metal wire 2 from cutting inside the hose wall.

As described above, the present invention has great practical value as it can increase pressure resistance by embedding two types of reinforcing bodies in the hose wall and at the same time prevent the hose from being charged without any inconvenience.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional view showing a conventional example, Fig. 2 is a partially cutaway front view of the hose of the present invention, and Figs. 3 and 4 show other embodiments of the present invention. FIG. 1...Hose wall, 2...Metal wire, 3
... Helical reinforcing body, 4... Reinforcing fiber layer.

Claims (5)

[Scope of utility model registration request] (1) A hose in which a hard helical reinforcement is embedded in a soft hose wall and a reinforcing fiber layer is embedded radially inward or outward from the buried position of the hard helical reinforcement, the hard helical reinforcement and A pressure-resistant hose characterized in that antistatic metal wires are spirally embedded at the same pitch as the hard helical reinforcing body in a radially intermediate portion between the reinforcing fiber layer and the reinforcing fiber layer. (2) Utility model registration claim No. (1) in which the metal wire is embedded in both the hard helical reinforcement body and the reinforcing fiber layer without contacting them.
Pressure resistant hose as described in section. (3) The pressure-resistant hose according to claim (1), in which the metal wire is embedded only in contact with the reinforcing fiber layer. (4) The pressure-resistant hose according to claim (1), in which the metal wire is embedded only in contact with the hard spiral reinforcement. (5) The pressure-resistant hose according to claim (1), in which a metal wire is embedded in contact with both the hard helical reinforcing body and the reinforcing fiber layer.