GB625613A - Improvements in flexible electric power cables - Google Patents

Abstract

625,613. Cables. COMMERCIAL SECRETARIES, Ltd., FAIRFIELD, R. M., and DIXON, N. June 16, 1947, No. 15823. [Class 36] A flexible electric power cable has a number of conductors, which may be insulated or bare, embedded in an integral mass of conductive rubber formed by bonding a number of condutive rubber parts, each of which encloses one of said conductors, together or to a longitudinally extending member of conductive rubber. the conductors being free to move within their insulating coverings, or with their insulating coverings within the mass, this movement being facilitated by the use of lubricating material on or between the surfaces of the conductors or their insulating coverings and the conductive rubber mass. Four cores 1, the outer surfaces of which are smoothed by a lapping of metal tape 2, the outer surface of which is lubricated as by graphite, may be used. Three of the cores are encased in insulating rubber 3, the fourth or earth conductor being provided with a conductive rubber covering 4. A screen 5 of conductive rubber is applied to each of the insulated cores. The four cores are then laid in a conductive rubber cradle 6, the whole being enclosed in an insulating rubber sheath 7. The cable is vulcanized to make an integral structure in which the conductors are free to move. The metal tape 2 may be omitted, and a lubricated fabric tape may be placed between the layers 3 and 5, leaving each of the insulated power conductors free to move within the screening layer 5. An outer screen consisting of a number of segments 10 of conducting rubber, each of which encloses a metallic conductor 11, may be applied within a sheath 12 of insulating rubber. The conductors 11 are lubricated before being inserted in the segments 10.