Electricity: conductors and insulators – Conduits – cables or conductors – With embedded conduit-duct or conductor
Patent
1989-11-08
1991-04-30
Askin, Laramie E.
Electricity: conductors and insulators
Conduits, cables or conductors
With embedded conduit-duct or conductor
29418, 29848, 156 47, 191 23R, 264139, 439110, H01B 700, H01B 1300, H02G 500, H01R 2514
Patent
active
050120441
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an assembly including a light alloy profiled section or member, and more particularly such a section made of aluminum or an aluminum alloy, including one or more insulated electrical conductors, as well as to a process for formation thereof.
Profiled sections obtained by extruding or drawing aluminum or an aluminum alloy have a cross-sectional shape defined by their own function/application, e.g. structural elements such as beams and frames, rails, ducts, vehicle body elements, etc. For some of these profiled sections it is particularly desirable to have one or more insulated electrical conductors integrated with the sections to provide energy or signal transport circuits. Currently, this is obtained by introducing commercial electrical cables into such sections; namely, cables having one or more conductors with generally at least one insulating sheath. It is obvious that the insertion of such an electrical cable into a profiled section constitutes a time-consuming, fastidious and extremely expensive operation comprising several steps which cannot be entirely mechanized and automated.
From U.S. Pat. No. 4,217,018 there is known an electrical supply track comprising a channel-shaped steel casing lined inwardly and outwardly with a synthetic resin and provided with a pair of supporting members molded integrally with the inner resin layer for embedding of exposed (bare) conductive members.
Obviously there is no possibility for an integrated in-line low cost manufacturing of supply tracks by the disclosed method comprising separate steps of bending of a steel plate into a channel shape, coating of shaped surfaces, providing integrally molded supporting members and finally insertion of the exposed conductive members into the supporting members.
FR No. 1,253,131 discloses, in connection with provision of an improved trolley line, a band comprising a series of parallel electrical conductors with exposed surfaces being cast into an insulating matrix and subsequently fastened by gluing to a metallic section. Once again, this is a laborious manufacturing multi-step process resulting in expensive products and probably also an inferior contact between the band and metallic section.
SUMMARY OF THE INVENTION
The object of the present invention is to overcome the above drawbacks and to provide an assembly including a light alloy profiled section or member having one or more insulated electrical conductors, the assembly of the profiled section and the conductors being integrally formed during manufacture using a process with several operating phases which may be entirely mechanized and automated, as well as to a process for the formation of such assembly.
Another object of the present invention is to provide an improved intimate adhesion between the insulated conductors and the surrounding profile section.
In accordance with the invention a light alloy profiled section comprises at least one linear electrical conductor extending parallel in the longitudinal direction of the profiled section, being formed from the same material as the profiled section, and being insulated electrically in a solid filling exhibiting a bare surface, and which itself has a bare surface oriented in the same general direction as that of the filling.
Also in accordance with the invention, when the profiled section is at an intermediate stage corresponding to its being drawn or extruded, it comprises at least two permanent walls and a temporary dividing wall, whose inner faces form a cavity for receiving the filling in a non-solid state, the inner face of the temporary dividing wall having longitudinal parallel sections for forming the insulated electrical conductors retained in the filling in the solid state after removal of the dividing wall, the inner face of at least one of the two walls having parallel longitudinal projections ensuring an intimate and firm contact between the walls and the solid filling.
According to other features of the invention the bare surface of one or mor
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patent: 2934815 (1960-05-01), Stumbock
patent: 3182217 (1965-05-01), Quinn
patent: 3603918 (1971-09-01), Woertz
patent: 4217018 (1980-08-01), Yoshida et al.
patent: 4342144 (1982-08-01), Doguchi
Askin Laramie E.
Norsk Hydro a.s.
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