JP2001056074A - Resin hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a displaced conductor body built in a helical reinforcing body from being exposed from an inner surface of a hose, and surely hold it between the helical reinforcing body and a hose wall. SOLUTION: A hose wall 2 is formed by winding a strip belt 5 made of a soft resin in a helical shape with its neighboring side ends in contact with each other. A reinforcing body 3 made of hard resin integrated with a conductor body 4 is wound in a helical shape on an outer peripheral surface of the hose wall 2. The neighboring side ends of the strip belt 5 are connected and combined by heat fusing them with the reinforcing body 3 wound over the neighboring side ends. The contact part position of the strip belt 5 is displaced from the built-in position of the conductor body 4 in the hose axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin hose used as, for example, a vacuum cleaner hose, in particular, a hose wall formed by spirally winding a strip made of a soft resin, and a spiral reinforcement made of a hard resin. The present invention relates to a resin hose including a body and a conductor built in a spiral reinforcement.

[0002]

2. Description of the Related Art With regard to this type of hose, the applicant of the present invention has previously proposed that a conductor made of a bare stranded copper wire is movably incorporated in a hard resin spiral reinforcement body as disclosed in Japanese Patent Application No. 11-408.
No. 0, and a flattened strip is spirally wound in a butt shape by pressing a molten resin tube extruded from a soft resin, and a butt portion between adjacent side edges thereof is joined to form a hose. Japanese Patent Application No. Hei 11-3 to form a wall
No. 5849.

[0003]

By the way, in the latter case, the connection and integration of the strips forming the hose wall are performed by straddling the outer surface of the butted portion of the strips which have already been cooled and have no welding property by themselves. This is performed by winding and fusing a spiral reinforcing body made of a hard resin in a molten state. When the conductor is incorporated in the spiral reinforcing body in the molten state as in the former case, it is usually shown in FIG. As shown in the figure, the built-in position of the conductor 10 and the abutting portion 12 between the strips 11 have a positional relationship substantially on the same line in the hose axis direction. There is a possibility that the hose moves toward the inside in the radial direction of the hose and is located between the butting portions 12 of the strips 11 that are not yet connected and integrated, and is exposed to the inner surface of the hose. This phenomenon was particularly remarkable when a slight tension was applied to the conductor during winding of the spiral reinforcement.

[0004] Thus, due to the displacement of the conductor,
The conductor may fall off from the hose, or if the conductor is a bare copper wire, it may cause an electric shock accident.
In view of the above, it is an object of the present invention to provide a resin hose that is securely held at least between a helical reinforcing body, which is an insulator, and a hose wall without being exposed to the inner surface of the hose even if the conductor is displaced. It is assumed that.

[0005]

Means for Solving the Problems The present invention has the following constitution to achieve the above object. (1) A strip made of a soft resin is spirally wound with its adjacent side edges in contact with each other to form a hose wall, and a hard resin-made strip having a conductor embedded in the outer peripheral surface of the hose wall. A resin hose spirally wound with a reinforcing body, and connected and integrated by thermal fusion with the reinforcing body wound across the side edges of the adjacent strips between the side edges, Displacing the contact position of the strip and the built-in position of the conductor in the hose axis direction. (2) In the resin hose of (1), the strip made of a soft resin is formed by pressing an extruded molten tube to flatten it.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows the entire shape of a resin hose of the present invention in which a part of a tube wall is cut away. A flexible hose 1 has a hose wall 2 made of a soft resin and an outer peripheral surface made of a hard resin.
The spiral reinforcements 3, 3 are formed by being attached at a double pitch, and a conductor 4 made of a bare stranded copper wire is built in each of the spiral reinforcements 3, 3.

The hose wall 2 is formed by spirally winding a strip 5 made of a soft resin such as a thermoplastic elastomer (TPE) with its side edges abutting against each other. A melt tube 6 extruded from a head of an extruder (not shown) is crushed and flattened in a tape shape (see FIG. 3). The melt tube 6 is straddled on a contact portion 7 of a strip 5 and immediately after extrusion molding. A helical reinforcing member 3 (one helical reinforcing member of double pitch) made of a polyolefin resin such as polypropylene or polyethylene, which is compatible with the strip 5 and is heat-fusible, is wound and fused. As a result, the strips 5 which have already been cooled and have no adhesiveness themselves are connected and integrated. In this embodiment,
The strip 5 is wide and the other spiral reinforcement 3 of double pitch is attached to an intermediate portion in the width direction.

As shown in the enlarged view of FIG. 2, the conductor 4 incorporated in the spiral reinforcement 3 is inserted inside the spiral reinforcement 3 with play and is movable around the spiral reinforcement 3. A space 8 is formed, and the built-in position in the spiral reinforcement 3 is a position deviated from the center in the width direction to the side edge direction, and is the same as the contact portion 7 of the strip 5 in the hose axis direction. It is displaced so as not to be on A. Therefore, even if the conductor 4 moves inward in the radial direction of the hose from the inside of the thickness of the spiral reinforcement 3 during the molding of the hose, the conductor 4 is retained on the outer surface of the strip 5 and moves further. Is prevented from being exposed on the inner surface of the hose.

In the present invention, the strip is not limited to a flattened tube, but may be a tape-shaped strip. The spiral reinforcing body may be wound into a single or three or more sections. The conductor may be attached to a wall, and the conductor is not limited to a bare stranded copper wire, but may be an insulated coating or a single wire.

[0010]

According to the present invention, in a resin hose made of a combination of a soft resin and a hard resin and having a conductor embedded in a spiral reinforcement, it is possible to reliably prevent the conductor from being exposed on the inner surface of the hose. There is no danger of falling off or electric shock, and in particular, there is an advantage that a low-cost bare copper wire can be used safely as a conductor.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a tube wall of a hose of the present invention is cut away.

FIG. 2 is a partially enlarged sectional view of a tube wall of a hose.

FIG. 3 is a diagram showing an example of forming a strip.

FIG. 4 is a sectional view of a tube wall showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible hose 2 Hose wall 3 Spiral reinforcement 4 Conductor 5 Strip 6 Tube 7 Contact part

Claims (2)

[Claims] 1. A hard resin in which a strip made of a soft resin is spirally wound with its adjacent side edges in contact with each other to form a hose wall, and a conductor is built in the outer peripheral surface of the hose wall. A spirally wound reinforcing member made of a stainless steel, and connected and integrated by heat fusion with the reinforcing member wound across the side edges of the adjacent strips between the side edges, A resin hose, wherein the position of the contact portion of the strip and the position of the built-in conductor are displaced in the hose axis direction. 2. The resin hose according to claim 1, wherein the strip made of a soft resin is flattened by pressing an extruded melting tube.