JPH10224943A - Shield tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield tube where there is no fault caused by breakdown of itself, and the mounting work and adjustment by cutting can be performed easily, and besides the contact condition between the fellow terminals at the overlap is reformed. SOLUTION: A shield tube 4 is made by stacking a conductive sheet 2 consisting of synthetic fiber cloth plated with metal and an insulating sheet 3 consisting of an flame retardant synthetic resin film, and this is provided with a coupling means 5, which couples the ends of the shield sheet in such condition that an overlap is brought into existence at both ends of the shield sheet 4 at the time of winding to a cable C of the shield sheet 4, outside the vicinities of both ends of the shield sheet 4, and here turnups 6 are made by bending the shield sheet 4 toward the insulating sheet 3 at the overlap of the shield sheet 4, and elastic bodies 7 are arranged inside the turnups 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tube for accommodating various cables and preventing leakage and interference of electromagnetic waves to the outside and intrusion and interference of electromagnetic waves from the outside.

[0002]

2. Description of the Related Art Heretofore, as a shield tube of this type for housing and shielding a cable inside, a flexible plate-shaped insulator is formed so as to be connectable to a tube by means of male and female connecting means. A metal foil is attached to the side surface as a conductor, and a flexible plate-like insulator formed by attaching a drain wire to the metal foil or a flexible plate-like insulator is formed so as to be connectable in a tube shape by male and female connection means. A mesh member formed by knitting a fine metal wire is attached, and a drain wire is attached to the mesh member.

[0003] As shown in Fig. 3, an insulator having a conductor attached to the inner surface is wound around a cable so that both ends thereof overlap with each other, and male and female connecting means provided outside near both ends are connected. Only the both ends of the insulator are formed so that the conductor goes around the outside, and the entire circumference of the cable is shielded by electrically conducting at the overlapped portion. .

[0004]

However, in the conventional product using the former metal foil as a conductor, since the metal foil has no elasticity,
When it is used by attaching it to a bent part or a movable part of a cable, the metal foil often breaks, and it has the disadvantage that the shielding property is impaired. The cut end of the wire may break the insulator, and the bulky mesh member makes it difficult to connect the connecting means, or the cable may get caught in the mesh when the cable is inserted inside the mesh member. For example, there is a drawback that the mounting operation takes time.

[0005] In the case of the latter, it is difficult to cut the mesh member when cutting is attempted due to the extra length, so that it takes time to adjust the length according to the cable.

Further, the contact between the both ends in the overlapped portion of the conventional product is made by the restoring force generated by bending the conductive and insulating materials so as to curl the base material in the form of a plate. , The contact state tended to be unstable.

Therefore, the present invention has been made to solve the above-mentioned problems, and there is no failure due to breakage of the shield tube, mounting work and cutting adjustment can be performed easily, and contact between both ends in the overlapped portion. It is an object of the present invention to provide a shield tube with an improved condition.

[0008]

In order to achieve the above object, a shield tube according to the present invention comprises a conductive sheet made of a metal-plated chemical fiber cloth and an insulating sheet made of a flame-retardant synthetic resin film. A shield sheet that is formed and wound around a cable with the conductive sheet side inside, and provided outside near both ends of the shield sheet,
It consists of connecting means connected in a state where overlapping portions are generated at both ends of the shield sheet when winding the shield sheet, and at the overlapping portion of the shield sheet, the shield sheet is bent toward the insulating sheet side to form a folded portion, Attaching a drain wire to the outside of one of the folded portions is a means for solving the problem.

It is preferable that an elastic body made of a flame-retardant resin foam is disposed inside the folded portion.

[0010]

Embodiments of the present invention will be described below. 1 is an end view of the shield tube in an unfolded state, and FIG. 2 is a cross-sectional view showing the use state of the shield tube. The shield tube denoted by reference numeral 1 shown in the figure is subjected to electroless copper plating and electroless nickel plating. A shield sheet 4 formed by laminating a conductive sheet 2 made of a polyester fiber cloth and an insulating sheet 3 made of a flame-retardant vinyl chloride film and wound around the cable C with the conductive sheet 2 side inside; And connecting means 5 which are provided near the both ends and are connected when the shield sheet 4 is wound. In addition, the insulating sheet 3
May be replaced with a flame-retardant vinyl chloride film and another flame-retardant synthetic resin film.
Other chemical fibers of polyester fiber cloth may be employed.

The connecting means 5 has band-shaped engaging portions 5a and 5b which are continuous along one side edge, and the other side edge is heat-sealed to the outer surface near each end of the shield sheet 4. This is a so-called vinyl zipper attached by the method described above, and is connected by engaging the male engaging portion 5a and the female engaging portion 5b. When the connection means 5 is connected, the shield sheet 4 is formed in advance so that the both ends of the shield sheet 4 have overlapping portions. In this embodiment, one of the connection means 5 having the male engagement portion 5a is provided. The length from the branch to the tip of the shield sheet 4 is 30 mm.
The length from the branch of the shield sheet 4 to one end of the shield sheet 4 is 25 mm, and the length from the branch of the shield sheet 4 to the tip of the other connecting means 5 having the female engaging portion 5b. 13 mm, the length from the junction of the connecting means 5 and the shield sheet 4 to the other end of the shield sheet 4 is 33 mm, and the male engagement portion 5a and the female engagement portion 5b
Are set so that the one end and the other end of the shield sheet 4 overlap by about 20 mm when they are engaged with each other.

In this embodiment, a vinyl fastener is used as the connecting means 5. However, the present invention is not limited to this, and a belt-like body provided with a hook-and-loop fastener or a hook along one side edge may be used. It may be attached to the outer surface near the end of the shield sheet 4 or the like.

In some cases, the surface of the conductive sheet 2 of the shield sheet 4 is coated with flame-retardant vinyl chloride for protection. This serves both to protect the plating of the conductive sheet 2 and to prevent the shield tube 1 from being ignited by the heat of the cable C stored during use. The flame-retardant vinyl chloride is thinly coated on the conductive sheet 2 so that the resistance is about 0.5Ω / □ or less. As a material for this protection treatment, another flame-retardant synthetic resin may be used instead of flame-retardant vinyl chloride.

A folded portion 6 is formed in the overlapped portion of the shield sheet 4 by bending an end of the shield sheet 4 toward the insulating sheet 3 and sewing the folded portion.
Is in a state of covering about 20 mm on the outer insulating sheet 3 surface.

Reference numeral 7 denotes an elastic body made of a flame-retardant polyurethane resin foam, which is sandwiched over the entire inside of the folded portion 6. Thereby, when the shield tube 1 is mounted, the ends of the shield sheet 4 are easily in contact with each other due to the swelling thereof, and a restoring force is generated against a force pressed from the outside. Will increase. The elastic body 7 is not limited to a polyurethane resin foam at all, and may be of any type as long as it is a flame-retardant resin foam.

Reference numeral 8 denotes a drain wire attached to the outside of one end of the shield sheet 4 by sewing along the end. By attaching in this manner, the drain wire 8 is connected to the cable C or the conductive sheet 2. To prevent the cable C and the conductive sheet 2 from being damaged by contact with the surface of the cable C.

When the shield tube 1 is attached to the cable C, the shield tube 1 receives the electromagnetic wave from the surface of the conductive sheet 2 and grounds it by the drain wire 8, thereby preventing the stored cable C from leaking and interfering with the outside. To prevent and protect the cable C,
As described above, the contact between the overlapped portions at both ends of the shield sheet 4 was ensured, so that the cable C could be shielded without leakage.

The material, dimensions, shape,
It goes without saying that the configuration, dimensions, shape, configuration, type of metal plating, and the like of the connecting means are not limited to the above-described embodiment.

[0019]

According to the present invention, the above-mentioned configuration achieves the original object. That is, according to the shield tube 1 of the present invention, the shield sheet 4 is formed by laminating the conductive sheet 2 made of chemical fiber cloth plated with metal on the insulating sheet 3 made of a flame-retardant synthetic resin film. The sheet 4 has excellent flexibility and the insulating sheet 3
Also, there is no possibility that the function is deteriorated due to damage to the conductive sheet 2.

Further, since the insulating sheet 3 and the conductive sheet 2 are integrated, mounting work such as accommodating the cable C and connecting the connecting means 5 is easy, and the length can be adjusted because it can be easily cut. Is simple, and the work time required for mounting and adjustment can be reduced.

Further, by disposing an elastic body 7 made of a flame-retardant resin foam inside the folded portion 6 at the end of the shield sheet 4, the folded portion 6 becomes elastic and swells. At this time, the ends of the shield sheet 4 are likely to come into contact with each other, and a restoring force is generated when the connecting means 5 is pressed inwardly or outwardly by the accommodated cable C. , The contact between the overlapping portions at both ends of the shield sheet 4 is assured, so that the shield tube 1 can shield the periphery of the cable C without leakage over the entire length of the mounted tube.

As described above, according to the present invention, the work of attaching and adjusting the cable is easy, the occurrence of breakage failure is small, and the contact between the overlapping portions at both ends of the shield sheet is ensured. It has such beneficial effects.

[Brief description of the drawings]

FIG. 1 is an end view of a developed state showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a use state of the embodiment.

FIG. 3 is an end view showing a use state of a conventional product.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shield tube 2 Conductive sheet 3 Insulating sheet 4 Shield sheet 5 Connecting means 5a Male engaging part 5b Female engaging part 6 Folding part 7
Elastic body 8 Drain wire C cable

Claims (2)

[Claims] 1. A shield sheet formed by laminating a conductive sheet made of a metal-plated chemical fiber cloth and an insulating sheet made of a flame-retardant synthetic resin film and wound around a cable with the conductive sheet side inside. Connecting means provided outside the vicinity of both ends of the shield sheet and connected in a state where overlapping portions are generated at both ends of the shield sheet when the shield sheet is wound, and a shield sheet is provided on the overlapping portion of the shield sheet with an insulating sheet. A shield tube characterized by being bent to the side to form a folded portion, and having a drain wire attached outside one of the folded portions. 2. The shield tube according to claim 1, wherein an elastic body made of a flame-retardant resin foam is disposed inside the folded portion.