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US 4,398,058 AGranted
Moisture-proofing electrical cable
AssigneeKabelmetal Electro GmbH
InventorsDieter Gerth, Friedrich Schatz, Cornelius van Hove
Life of this patent
Estimating the term…
Abstract
Three stranded-together, insulated conductors are enveloped in a rubber-elastic, inner sleeve on which sits a corrugated twin tube arrangement of an inner copper tube and an outer steel tube. The corrugations seal the interior in a bulkhead-like fashion.
Claims8
A moisture-proof cable, comprising:
- a plurality of inner conductors assembled in a stranded bundle;
- an insulating jacket assembly around the conductor bundle and constituting therewith a cable core;
- and
- a twin tube comprised of two thin metal strips, a first one having been longitudinally folded around the core and seam-welded along edges of the first strip, a second one of the strips having been longitudinally folded around the first one and seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
1 more element
A moisture-proof cable, comprising:
- an inner conductor being comprised of a plurality of stranded-together wires;
- an insulating jacket assembly around the conductor and constituting therewith a cable core;
- and
- a twin tube comprised of two thin metal strips, a first one of the strips having been longitudinally folded around the core and longitudinally seam-welded along its edges, a second one of the strips having been longitudinally folded around the first one and longitudinally seam-welded along its edges, the first one having a higher electrical conductivity but a lower mechanical resistance than the second, outer one, the twin tube having corrugations commonly made in situ and which extend into the jacket in order to obtain longitudinal sealing against the migration of moisture.
1 more element
Dependencies are inferred from the claim text.