JPH0247538Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background and Purpose of the Invention] The present invention relates to an improvement of a flat floor cable, particularly a flat floor cable most suitable for telephone wiring.

In recent years, attention has been paid to a wiring method in which power, telephone, and other data transmission cables in an office are routed under the carpet.

This flat floor cable wiring method is a wiring method in which flat cables are routed under a carpet spread on the floor, and unlike conventional wiring using ducts or piping buried in the floor, Since the route can be expanded and changed freely, it is easy to change the wiring route due to the recent expansion of office automation, and since there is no exposed wiring on the floor, it is safe and aesthetically pleasing.

In addition, there is no need to embed ducts or piping in the floor, which reduces the total cost of building construction.Furthermore, office carpeting has good soundproofing effects, provides excellent environmental friendliness, and has excellent heat insulation properties. It is excellent.

By the way, the characteristics required of this type of flat floor cable are that when it is wired under a carpet, the carpet surface must be free from unevenness, the thickness is limited, and It was necessary to withstand the load.

Conventionally, flat floor cables that meet this requirement include a cable core consisting of an insulated conductor and a protective sheath that covers multiple insulated conductors at once, and a reinforcing tape layer pasted from above and below the cable cores arranged in parallel. A flat floor cable consisting of a dam is proposed.

However, in this conventional flat floor cable, due to the need to reduce the thickness of the cable, the pairs or ends are arranged in parallel without being twisted, and therefore the crosstalk characteristics between the pairs or ends are not good.

That is, this is because the induced current induced in the metal foils of the upper and lower reinforcing tape layers constituting the cable's outermost sheath affects other pairs and ends as crosstalk.

The present invention was devised for the purpose of providing an improved flat floor cable with excellent electrical characteristics by improving a part of the conventional flat floor cable.

[Summary of the idea]

In other words, the gist of the present invention is a flat floor cable that is routed under a carpet spread on the floor, and the cable consists of an insulated conductor and a protective sheath that covers multiple insulated conductors at once. A reinforcing tape layer is attached from above and below the cable cores arranged in parallel so as to wrap around the cable cores, and the reinforcing tape layer is a metal tape with plastic tape on one side. The flat floor cable is characterized in that two or more slits are provided at the neck portions of the reinforcing tapes to which they are attached, and the slit pitches are staggered from each other.

〔Example〕

Next, an embodiment of the flat floor cable of the present invention will be further described with reference to the accompanying drawings.

As shown in the accompanying drawings, in the cable core, an insulator 2 made of polyethylene is extruded and coated around the outer periphery of a conductor 1, and two insulated conductors are further covered as a pair with a vinyl chloride sheath 3.

A predetermined number of cable cores are arranged in parallel,
A reinforcing tape 4 is attached so as to wrap the cable core from above and below.

The reinforcing tape 4 is constructed by pasting a metal tape with plastic tape on one side and adhesive on the other side, with the adhesive side facing inside.

A slit is provided in the adhering neck portion 5 of the reinforcing tape 4 to facilitate separation of the cable pair.

As the conductor 1, an annealed copper wire is used.

As the insulator 2, foamed polyethylene or the like is used in addition to polyethylene.

The cable cores are not limited to pairs as in the embodiment, but may be in the form of a pair, and the required number of cores may be arranged in parallel.

The vinyl chloride sheath 3 is necessary to improve external impact characteristics, and if foamed vinyl chloride is used, the characteristics will be further improved.

Here, two or more slits 6 are provided in the adhesion neck 5 of the reinforcing tape 4, and the pitches of the slits are shifted from each other, so that the electrical distance between the pairs is small. It is substantially larger and has excellent electrical characteristics.

[Effect of idea]

As explained above, the flat floor cable of the present invention has a simple structure, which makes it possible to provide an excellent flat floor cable with good electrical characteristics, and has great industrial value.

[Brief explanation of drawings]

The accompanying drawing is an explanatory cross-sectional view showing one embodiment of the flat floor cable of the present invention. 1: conductor, 2: insulator, 3: sheath, 4: reinforcing tape, 5: neck part to which reinforcing tape is attached, 6: slit.

Claims (1)

[Scope of utility model registration request] This is a flat floor cable that is routed under a carpet spread on the floor, and the cable consists of a cable core consisting of an insulated conductor and a protective sheath that envelops multiple insulated conductors, and a cable core that is arranged in parallel. It consists of a layer of reinforcing tape that is attached to the cable core from above and below so as to wrap it around the cable core, and the reinforcing tape is a metal tape with plastic tape provided on one side, and the neck portions of the reinforcing tapes are attached to each other. 1. A flat floor cable comprising two or more slits, and the slit pitches are staggered from each other.