Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Patent
1984-09-24
1986-01-28
Grimley, A. T.
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
174113C, 174131A, H01B 704, H01B 708
Patent
active
045673217
ABSTRACT:
An improved, highly flexible flat multi-conductor electrical cable is provided, useful for example in robots wherein such cables may be flexed many times, comprising a plurality of conductor assemblies held in parallel relationship between layers of insulating coverings, the improvement comprising conductor assemblies having an elongate, non-conductive center core filament helically overwrapped along its longitudinal dimension by a first conductor in foil or tape form, such as copper foil, this first tape conductor having an outer covering of a conductive, low-friction material, the conductive covering being helically overwrapped along its longitudinal dimension by a second conductor in foil or tape form, such as copper foil, the second foil conductor being wrapped in a lay opposite to that of the first conductor, i.e. if one foil conductor is "S" wrapped, the other foil conductor is "Z" wrapped. A preferred core filament material is expanded, porous, sintered polytetrafluoroethylene, and a preferred conductive covering is conductive, unsintered polytetrafluoroethylene. Preferred insulating coverings are layers of polytetrafluoroethylene.
REFERENCES:
patent: 2998840 (1961-09-01), Davis
patent: 3234722 (1966-02-01), Gilmore
patent: 3760319 (1973-09-01), Kawazoe
patent: 4218581 (1980-08-01), Suzuki
patent: 4313645 (1982-02-01), Cocco
patent: 4423282 (1983-12-01), Suzuki et al.
patent: 4443657 (1984-04-01), Hill et al.
Fibrous Porous TFE Provides Dimensional Stability for High Temperature, Low Loss Coaxial Cable; Insulations/Circuits; Jun. 1971; p. 19.
Totsuka, M. et al.; The Small Size Telephone Set Cord; Review of the Electrical Communication Laboratories; vol. 22, Nos. 3-4; Mar.-Apr. 1974; Nippon Telegraph and Telephone Public Corp.
Grimley A. T.
Junkosha Co. Ltd.
Nimmo Morris H.
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