Yieldably extensible self-retracting shielded cable

Details Yieldably extensible self-retracting shielded cable Yieldably extensible self-retracting shielded cable

1988-12-09

1989-08-29

Askin, Laramie E.

Electricity: conductors and insulators

Conduits, cables or conductors

Extensible

174106R, 174107, 174108, 333243, H01B 706, H01P 306

Patent

active

048619450

ABSTRACT:
A yieldably extensible, self-retracting cable comprises a flexible center conductor surrounded by a primary dielectric material with a flexible wire shield exterior thereof and a thermoplastic or thermosetting elastomeric outer jacket formed permanently in a helical shape. The primary dielectric insulation comprises materials such as polymeric fluorocarbon or irradiated polyethylene having an exceptionally low dielectric constant. The low dielectric constant is maintained despite the permanently coiled configuration of the cable by ensuring that the plasticizing or curing temperature of the jacket is less than the melting or other degradation temperature of the dielectric material, and by utilizing unbraided wire shielding comprising a pair of concentric layers of wire wound helically in mutually-opposite directions to avoid mechanical injury of the dielectric material.

REFERENCES:
patent: 3240867 (1966-03-01), Maddox
patent: 3274329 (1966-09-01), Timmons
patent: 3334177 (1967-08-01), Martin
patent: 4131757 (1978-12-01), Felkel
patent: 4408089 (1983-10-01), Nixon
patent: 4552989 (1985-11-01), Sass
patent: 4638114 (1987-01-01), Mori
patent: 4738734 (1988-04-01), Ziemek

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