JPH0646175Y2 - Electric wire protection tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to improvement of a tube body for protecting a cable such as an electric wire or an optical fiber.

(Prior Art) When electrical control means or optical fiber cables are connected to machine tools and other various machines generally used in factories, wire cords and optical fiber cables are exposed as they are on the floor. It is wired.

However, when wiring is bare on the floor,
There is a risk that a pedestrian walking on the floor, a forklift, or other vehicles may be stepped on to damage the electric wire cord or the outer jacket of the cable, exposing the copper wire inserted inside or the optical fiber. Therefore, as a means for solving the above-mentioned problems, the protection tube is inserted. By the way, conventionally used as a tube for protecting electric wire cords and cables is a bellows tube made of a soft synthetic resin such as polyethylene or vinyl chloride resin, or a vinyl chloride resin outside the bellows tube made of polyethylene. There is a double tube in which the outer tube formed in 1 is stacked.

However, the former one lacks pressure resistance, is easily damaged by pedaling pressure, and causes buckling at the bent portion, which hinders the wire passing work. The latter one lacked flexibility, and the bending caused the inner and outer pipes to peel off, and further, the pipes could break, resulting in an accident such that the wire could not be passed.
In addition, since the innermost surface of the tubular body with which the electric wire cord and the cable come into contact with each other is made of soft synthetic resin, the contact resistance is large when the electric wire and the cable are inserted, the passability is poor, and the workability is deteriorated. .

(Technical Problem to be Solved by the Invention) A technical problem to be solved by the present invention is to provide a protective tube having pressure resistance, flexibility, and excellent wire passage property.

(Means for Solving the Technical Problem) The technical means taken by the present invention to solve the above-mentioned problems are as follows: a spiral shape of hard synthetic resin is formed on the inner peripheral surface of a tube body made of soft synthetic resin in a cylindrical shape. The reinforcing wire rod formed on the
On the outer peripheral surface of the pipe body, a tightening wire rod made of a hard material is spirally wound around the troughs located between the mountain-shaped projections of the reinforcing wire rod.

(Operation) When the electric wire cord or the cable protection pipe is passed through, the guide wire is inserted without resistance by the unevenness of the reinforcing wire material made of a hard synthetic resin and spirally wound around the inner peripheral surface of the tube body and having a small friction resistance. When a wire protection tube with a wire cord or cable is piped into a manhole, etc., it is guided and inserted without resistance due to the unevenness of the tightening wire made of a hard material that is installed around the outer peripheral surface of the tube body and has a low friction resistance. .

Further, the reinforcing wire made of hard synthetic resin and the tightening wire made of hard material reinforce the pressure resistance of the pipe body made of soft synthetic resin, and at the same time, ensure flexibility.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the figure, (A ₁ ) is a tube body formed of a soft synthetic resin, for example, a resin such as vinyl chloride resin, polyurethane resin, ethylene-vinyl acetate copolymer, or synthetic rubber into a cylindrical shape. reinforcing wire material formed helically hard synthetic resin (1) has circumferential設突set on the inner circumferential surface of _1).

The reinforcing wire (1) is formed by using, for example, vinyl chloride resin, polyethylene resin, polypropylene resin, nylon resin as a hard synthetic resin, and improves the wire passability in the electric wire protection tube (A) and is flexible. This is to secure the sex.

On the outer peripheral surface of the pipe body (A ₁ ), a tightening wire rod (2) made of a hard material is spirally wound along a valley portion located between the mountain-shaped convex portions (1a) of the reinforcing wire rod (1). It is laid around.

Clamping wire (2) is, the breakdown voltage of the reinforcement (1) and tube body (A ₁₎ the tube body as well as reducing the frictional resistance of the outer peripheral surface of preventing tube body the positional deviation between the (A ₁₎ (A ₁₎ It is used to reinforce the strength and ensure flexibility. It is made of a hard material such as stainless steel in addition to the hard synthetic resin described above, and is wound so that the pipe body (A ₁ ) is tightened from the outside. I am turning.

By surrounding the reinforcing wire (1) and the tightening wire (2), spiral uneven surfaces are formed on the inner peripheral surface and the outer peripheral surface of the pipe body (A ₁ ), and frictional resistance on both surfaces is reduced. .

FIG. 3 shows another embodiment, which is a means for spraying or applying a lubricant (3) such as silicone or polyethylene glycol onto the surface of the reinforcing wire (1) of the electric wire protection tube (A) shown in the previous embodiment. It is coated with, and the lineability is further improved.

(Effects of the Invention) As described above, the present invention is such that a reinforcing wire rod spirally formed of hard synthetic resin is projected around the inner peripheral surface of a tube main body formed of soft synthetic resin in a cylindrical shape. Since the tightening wire rod formed of a hard material is spirally wound around the outer peripheral surface of the main body along the valley portion between the mountain-shaped convex portions of the reinforcing wire rod, it has the following effects.

When wire cables and cables are passed through the protective tube, the hard synthetic resin-made reinforcing wire that is spirally installed around the inner surface of the tube body has a low friction resistance, so the contact resistance is low and guide insertion is easy. can do. In addition, when connecting a wire protection tube with a wire cord or cable to a manhole, etc., the contact resistance is low and easy due to the unevenness of the tightening wire material made of a hard material that is installed around the outer peripheral surface of the tube body and has little friction resistance. You can insert the guide.

The protective tube is flexible and flexible due to the reinforcing wire and the tightening wire that are provided around the inner and outer peripheral surfaces of the soft synthetic resin tube body, and the protective tube is reinforced against external pressure and may break. It can be surely prevented from being damaged.

Since it is excellent in flexibility as described above, it can be sufficiently used for bending pipes, can be buried underground, and the number of connection points between protective pipes can be reduced.

Therefore, the intended purpose can be achieved.

[Brief description of drawings]

Drawing shows an embodiment of the present invention, Fig. 1 is a partially cutaway front view, Fig. 2 is a vertical sectional side view taken along line II-II of Fig. 1, and Fig. 3 is a partially cutaway front view showing another embodiment. Figures and 4 are IV-I in Figure 3.
It is a V-line vertical side view. In the figure (A): Electric wire protection tube, (A ₁ ): Tube body (1): Reinforcing wire, (2): Tightening wire

Claims (1)

[Scope of utility model registration request] 1. A reinforcing wire rod spirally formed of hard synthetic resin is projectingly provided on an inner peripheral surface of a pipe main body formed of a soft synthetic resin in a cylindrical shape, and the above-mentioned reinforcement is formed on an outer peripheral surface of the pipe main body. An electric wire protection tube formed by spirally winding and tightening a tightening wire rod formed of a hard material along a valley portion located between mountain-shaped convex portions of the wire rod.