Method of manufacturing a coaxial cable, and coaxial cable made by this method
AssigneeU.S. Philips Corporation
InventorLouis Joseph Henri Geominy
Life of this patent
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Abstract
A method of manufacturing a coaxial cable by a continuous process in which a cylindrical dielectric material is extruded about a central conductor, and parts of the dielectric are mechanically removed to form spaces at regular longitudinal intervals. An outer sheath is then applied, providing a low-loss cable having gas-filled spaces which are individually water-tight.
Claims7
A method of continuously manufacturing a coaxial cable having a dielectric which consists partly of a gas, comprising a central conducting wire, dielectric spacers surrounding said wire, and an envelope comprising a cylindrical outer conductor and an outer sheath, comprising the steps of continuously extruding a cylinder of synthetic dielectric material having a first diameter concentrically about a wire made of a conductive material, then cooling the synthetic material, then mechanically removing parts of the cylinder at longitudinally evenly distributed intervals along the cylinder by members which reciprocate with respect to the longitudinal direction of the cylinder of dielectric material such that said central conducting wire remains enveloped by directly adjacent dielectric material, while continuously advancing said cylinder in its longitudinal direction, the parts so removed being separated by circular cylindrical portions extending to said first diameter, and then applying a cylindrical sheathing about said dielectric so as to enclose gasfilled spaces, extending longitudinally along the cable without communication with one another, interiorly of said sheathing where the parts were removed.
A method of continuously manufacturing a coaxial cable having a dielectric which consists partly of a gas, comprising a central conducting wire, dielectric spacers surrounding said wire, and an envelope comprising a cylindrical outer conductor and an outer sheath, comprising the steps of continuously extruding a cylinder of synthetic dielectric material having a first diameter concentrically about a wire made of a conductive material, then cooling the synthetic material, then mechanically removing parts of the cylinder at longitudinally evenly distributed intervals along the cylinder such that said central conducting wire remains enveloped by directly adjacent dielectric material, the parts so removed being separated by portions extending to said first diameter, while continuously advancing said cylinder in its longitudinal direction, and then applying a cylindrical sheathing about said dielectric so as to enclose gas-filled spaces, extending longitudinally along the cable without communication with one another, interiorly of said sheating where the parts were removed;
- wherein said removing step comprises removing parts of the dielectric material to each side of a central portion, said central portion being bounded by two parallel faces lying on opposite sides of and parallel to the central conductor and by longitudinally meandering portions extending perpendicularly outward from said face to the surface of said cylinder having a first diameter.
Dependencies are inferred from the claim text.