JPH0448090Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a flexible tube body for protecting cables such as electric wires or optical fibers.

(Prior art) Generally, when electrical control means or optical fiber cables are connected to machine tools or other various machines used in factories, the electric wire cords and optical fiber cables are exposed on the floor. It is wired in a shape.

However, when wiring is exposed on the floor, the outer sheath of the wire cord and cable can be damaged by being trampled by pedestrians walking over the floor, or by forklifts and other transport vehicles.
There is a risk of injury if the copper wire or optical fiber inserted inside is exposed. Therefore, as a means to solve the above-mentioned problems, insertion of the protective tube into the protective tube has been carried out. By the way, the pipes conventionally used to protect electric wire cords, cables, etc. are those made of soft synthetic resin such as polyethylene or vinyl chloride resin into a bellows shape, or the outside of a bellows pipe made of polyethylene. It is stored in a double tube with an outer tube made of vinyl chloride resin.

However, the former lacks pressure resistance and
They were easily damaged by treading pressure, and buckling occurred at bent portions, causing support during wiring work. The latter type lacked flexibility and caused accidents such as the inner and outer tubes peeling off when bent, and even breaking and agitating the tubes, making it impossible to run wires. In addition, in both cases, the innermost surface of the tube body that the wire cord or cable comes into contact with is made of soft synthetic resin, so when the wire or cable is inserted, the contact resistance is large, making it difficult to pass the wire through, reducing work efficiency. .

(Problems to be Solved by the Invention) In view of the conventional circumstances as described above, the object of the present invention is to provide a flexible tube that has pressure resistance, flexibility, and excellent wire conductivity.

(Means for Solving the Problems) The technical means taken by the present invention to solve the above problems is to form the tube body from a soft synthetic resin, and to cover the inner circumferential surface with a hard synthetic resin wire. A plurality of spirals are wound in a spiral shape, and at least one of the spirals is thick and the others are thin.

(Function) According to the above means, since a plurality of spiral bodies made of hard synthetic resin are fixedly joined to the inner surface of the tube body made of soft synthetic resin, the pressure resistance strength of the tube body is equal to that of the spiral bodies made of hard synthetic resin. The wire is reinforced by the helix, and flexibility is sufficiently ensured by the helix having different wire diameters, and when the wire cord or cable is passed through, it is guided by contacting only the thick helix.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In the figure, 1 is molded into a circular tube shape from a soft synthetic resin, such as vinyl chloride resin, rubbery synthetic resin, polyurethane resin, etc. The tube body 1 has spiral bodies 2 and 3 wrapped around its outer circumference with a hard synthetic resin such as vinyl chloride resin, nylon resin, polypropylene resin, polyethylene resin, etc., on the inner peripheral surface of the tube body 1. The surface is joined to the tube body 1, and the inner circumferential surface is integrally fixed with the inner surface protruding inward of the tube.

Spiral bodies 2 and 3 bonded and fixed to the inner surface of the tube body 1
In this method, one of the spiral bodies 2 is made thick and the other spiral body 3 is made thin, and the two spiral bodies 2 and 3 are wound at equal pitches with a predetermined interval.

As a result, thick spiral bodies 2 and thin spiral bodies 3 are alternately located inside the tube body 1, and electric wire cords, cables, etc. inserted into the tube body 1 are guided in contact with the thick spiral bodies 2.

The above-mentioned thin spiral body 3 is not limited to a wire rod having a circular cross section, but may of course be a strip-shaped spiral body 3' as shown in FIG.

Furthermore, by coating the inside of the flexible tube shown in the above-described embodiments with a slipping agent such as silicone or polyethylene glycol by wiping or coating, the wire conductivity can be further improved. Further, the above-mentioned flexible tube can be integrally formed by gluing or tightly integrating a soft synthetic resin tube on the outside of a spiral hard synthetic resin wire.

Furthermore, the spiral bodies 2 and 3, which are partially embedded and fixed in the inner peripheral surface of the tube body 1, do not have a circular cross-sectional shape, but are embedded in the tube body 1 as a dovetail shape with a constriction, and are joined. Of course, it is good to strengthen the integration.

Further, although the tube body 1 in the above-mentioned embodiment is formed of a single piece of soft synthetic resin, the tube body 1 is made of a fourth
As shown in the figure, warp yarns 4 may be embedded along the axial direction within the wall thickness to prevent elongation of the tube body 1.

With the above configuration, the thick spiral body 2 and the thin spiral body 3 are spirally wound around the inner surface of the tube body 1 at a predetermined interval (pitch), and since the pitch of the thick spiral body 2 becomes wider, the electric wire Contact resistance when inserting a cord or the like is reduced, and wire passing performance is improved. Further, since the thin spiral bodies 3 or 3' are arranged between the thick spiral bodies 2, the pitches of the thick spiral bodies 2 are also reinforced by the spiral bodies 3 or 3', thereby preventing collapse due to external pressure.

(Effects of the invention) As detailed above, the flexible tube of the present invention has a plurality of hard synthetic resin wires wound helically around the inner surface of the tube body made of soft synthetic resin, and
At least one of these helices is thick and the others are thin and protrude inward of the tube and are bonded and fixed, so that the following effects can be achieved.

A spiral body of hard synthetic resin is wrapped around the inside surface of the tube body in the form of a multi-threaded thread, creating an uneven surface.
When wiring cords, cables, etc., only the thick helix is contacted, so there is little contact resistance and the wire can be wired smoothly.

Since the tube body is made of soft synthetic resin and the wire rod is made of hard synthetic resin, the flexible tube has flexibility and flexibility, and is resistant to external pressure when placed between thick spiral bodies. The thin spiral body also exerts a reinforcing effect and reliably prevents it from breaking.

As mentioned above, it has excellent flexibility, so it can be used for bent pipes, and it can also be buried underground, reducing the number of connections between flexible pipes.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is a vertical side view taken along line 2-2 in Fig. 1, and Figs. It is a partially cutaway front view showing an example. In the figure, 1...tube body, 2, 3... spiral body.

Claims (1)

[Claims for Utility Model Registration] A plurality of spiral bodies made of hard synthetic resin are integrally joined to the inner surface of a tube body made of soft synthetic resin, and at least one of the spiral bodies is thick and other is a thin flexible tube. The flexible tube according to claim 1, wherein the tube body has a plurality of warp yarns embedded in the axial direction at intervals in the circumferential direction.