High-temperature, low-noise coaxial cable assembly with high strength reinforcement braid
AssigneeEndevco Corporation
InventorRobert B. Johnson
Life of this patent
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Abstract
A high-temperature, low-noise coaxial cable assembly with high strength reinforcement braid is depicted and described. The cable assembly has very low self-noise generation and is particularly useful for telemetry and instrumentation purposes. Also, the cable assembly offers a tensile strength about an order of magnitude greater than conventional cable assemblies, and resultant improved service life and durability.
Claims15
A coaxial cable having a center conductor concentrically surrounded by a dielectric layer, said cable further comprising a continuous electrostatically conductive polymer layer including a spiral wrap of fused PTFE polymer tape having powder-fine carbon particles dispersed therein surrounding said dielectric layer, a conductive metallic wire braid over said electrostatically conductive layer, a high-strength fibrous braid over said wire braid, and means including a spiral wrap of fused nd heat-shrunk PTFE polymer tape, for applying a radially compressive force to said wire braid everywhere along its length, thereby to both inhibit relative movement of the wires of said wire braid and to insure their intimate electrical contact with said electrostatically conductive layer.
A coaxial cable assembly comprising:
- a center conductor concentrically surrounded by a dielectric;
- a concentric electrostatically conductive layer surrounding said dielectric;
- a high-strength fibrous braid over said electrostatically conductive layer;
- an end termination assembly having a center contact pin connecting with said center conductor and a connector body connecting separately with said electrostatically conductive layer and insulated from said center electrode,
- and mechanical attachment means attaching said fibrous braid with said connector body to sustain tensile forces applied to said cable assembly.
A method of making a high-temperature, low-noise, high-strength coaxial instrumentation cable, and method comprising the steps of:
- providing a center conductor with a concentric layer of high-temperature dielectric therearound;
- spiral-wrapping a layer of carbon-dispersed PTFE tape onto said dielectric, and heat-fusing said carbon-dispersed tape to provide a continuous electrostatically-conductive layer over said dielectric;
- providing a metallic wire braid followed by a high-strength fibrous braid onto said electrostatically conductive layer;
- tightly spiral-wrapping PTFE tape onto said fibrous braid, and heat-fusing said tape to further apply radially compressive force inhibiting relative movement of the wires of said wire braid while urging the latter into electrical contact with said electrostatically conductive layer.
A high-strength, high-temperature,low-noise coaxial instrumentation cable comprising:
- a stranded center conductor of copper coated steel wire;
- a concentric dielectric layer of PTFE on said center conductor;
- a continuous electrostatically conductive PTFE polymer layer surrounding said dielectric;
- a metallic wire braid surrounding said PTFE polymer layer,
- a high-strength fibrous braid surrounding said metallic braid;
- and an outer jacket layer of PTFE surrounding said fibrous braid and applying radially compressive force thereto and to said metallic braid to inhibit relative movement of the wires thereof as well as urging the latter into electrical contact with said electrostatically conductive PTFE polymer layer.
Dependencies are inferred from the claim text.