| | High voltage, gas-filled electric cable with spacers between conductor and sheath - Patent 4450317 |
 | | The cable is formed by extrusion of the sheath over the twisted core conductors after insertion of the spacers, and is vacuum corrugated after extrusion, the corrugator being specially formed and operated so as to accommodate the locations whereat the spacer ends engage with and locally deform the extruded sheath. |
 | | The arrangement is necessarily such as to obtain synchronisation of insertion of spacers with the advance of the cable cores to and through the extruder and the operation of the corrugator, and any suitable and convenient means may be employed for achieving this. |
 | | As can be seen, the spacers are received at appropriately formed mould blocks spaced apart from one another by one-half of the lay length of the twisted cable cores, these specially formed mould blocks accommodating the deformations caused in the extruded sheath by the tips of the spacers. |
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