Flexible conductor of high strength and light weight

Details Flexible conductor of high strength and light weight Flexible conductor of high strength and light weight

2000-09-21

2003-03-04

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Conduits, cables or conductors

Insulated

Reexamination Certificate

active

06528729

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a flexible conductor of high strength and light weight available to various kinds of electric wires such as trolley lines, overhead power lines, electric wires for wire harness and others.
2. Related Art
Conventionally, for purposes of imparting high tensile strength to conductors used to trolley lines, overhead power lines, electric wires for wire harness and others, for example as shown in FIGS.
2
(
a
) and
2
(
b
) such a conductor
13
has been employed where a plurality of reinforcing fibers
10
made of carbon fibers are encircled with a metal matrix
11
dispersed with ceramic particles, and if required, further furnished with a coating layer
12
on the outer circumference of the metal matrix. However, since in such a conductor
13
, each of the reinforcing fibers
10
is encircled with the metal matrix, the reinforcing fiber
10
is limited in serving performance, and in particular if the reinforcing fiber
10
occupies about 50% or more of the whole of the electric wire (volume ratio), flexural rigidity is too strong as a whole of the conductor and handling faculty is inferior.
For easily bending the conductor
13
, the thickness of the metal matrix
11
is reduced to make the whole of the conductor thin, but in turn the reinforcing fiber
10
is exposed in the surface of the metal matrix
11
, and the conductor
13
is difficult to make circular and a measure is necessary for die-processing. The coating layer
12
is thickened to correct the conductor
13
to be circular, inviting results opposite to aiming at reduction of the diameter.
As mentioned above, the conventional conductor supporting the reinforcing fiber therein is limited in improvement of tensile strength owing to restriction of the volume ratio of the reinforcing fiber, and is not suited to reduction of the diameter, either.
SUMMARY OF INVENTION
It is accordingly an object of the invention to provide a conductor having excellent tensile strength and bending characteristic and suited to reduction of the diameter thereof.
For accomplishing the object, the invention is to offer a flexible conductor of high strength and light weight (called briefly as “conductor” hereafter) which is provided by disposing at the center of the conductor a core material includes a plurality of twisted reinforcing fibers, and encircling a metal matrix therearound.


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