Tapered retractile cords

Details Tapered retractile cords Tapered retractile cords

1981-04-29

1983-02-22

Askin, Laramie E.

Electricity: conductors and insulators

Conduits, cables or conductors

Extensible

H01B 706

Patent

active

043750125

ABSTRACT:
A retractile telephone cord of this invention has a retractility which decreases substantially linearly from each end to a center of its length and an extensibility which increases substantially linearly from each end to a center of its length. The cordage includes a plurality of conductors which are individually insulated with a first plastic material and which are disposed in a planar array, and a jacket of a second plastic material which encloses the array. The jacket is formed about the array to provide a cross-section transversely of the cordage which includes at least one side that is parallel to the array. In making the retractile cord, a length of the cordage is wound helically about a mandrel with the one side of the cross-section of the cord being in engagement with the mandrel. This prevents any axial twisting of the cordage as it is wound on the mandrel and subsequent to the heating of the cord and the reversing of the direction of the helical wind, results in a cord having the above-mentioned retractility and extensibility properties.

REFERENCES:
patent: 2704782 (1955-03-01), Ames
patent: 3988092 (1976-10-01), Bloxham et al.
patent: 4090763 (1978-05-01), Congdon et al.
patent: 4123585 (1978-10-01), Sparzak et al.
patent: 4166881 (1979-09-01), Congdon et al.

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