Method of making an electric cable
AssigneeUnited States Steel Corporation
InventorGeorge E. Ollis
Life of this patent
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Abstract
A method of making electric cable having a plurality of electric conductors stranded together with a deformable semi-conducting strand in each valley between the conductors and a shielding composition around and in intimate contact with the conductors and strands. The conductors and strands are stranded together into a stranding die and the plastic composition is forced around them while they are in the stranding die.
Claims3
The method of making a stranded electric cable having a plastic composition in continuous and intimate contact with the individual conductors throughout the length of the cable which comprises twisting the conductors together and passing the conductors through a stranding die, said stranding die having a long narrow passageway sized for the desired dimension of plastic composition surrounding the stranded conductors, a chamber located intermediate the ends of the passageway and a funnel shaped entrance, while simultaneously applying a plastic under high pressure through a transverse opening in the die into the chamber and at the same time through part of the transverse opening to the surface of the funnel shaped entrance through a branch opening connecting the transverse opening and the funnel shaped entrance.
The method of making a stranded electric cable according to claim 5 in which the plastic composition is semi-conducting and which includes providing a plurality of deformable strands of semi-conducting material, applying the plastic composition under pressure into and around the deformable strands while stranding the electric conductors and deformable strands together around a center core with a single deformable strand laid in each valley between conductors and deforming the deformable strands by compression upon passage through the sizing section of the stranding die.
Dependencies are inferred from the claim text.