Electricity: conductors and insulators – Conduits – cables or conductors – Extensible
Patent
1989-06-30
1990-12-04
Askin, Laramie E.
Electricity: conductors and insulators
Conduits, cables or conductors
Extensible
57216, 57225, 114253, 174131A, 244 3, 280480, H01B 706, F41J 910, B60D 118, B63B 2156
Patent
active
049755439
ABSTRACT:
An energy-absorbing towline (14) comprises an elastomeric core (16) having a set of internal polymeric strands (18) helically wound around the outer surface (20) of the core in a first direction and a set of external polymeric strands (22) helically wound around the outer surface (24) of the internal strands in a direction opposite to the first direction. There may be more internal strands than external strands in order to maintain torque balance as the cable elongates. Each of the internal and external strands consists of a plurality of filaments (30), and each external strand (22) may have fewer strand filaments than each internal strand (18) so as to aid in torque balancing. Electrical conductors (26) may be helically disposed between turns of the external or the internal strands. When the towline experiences tension, the elastomeric core elongates, as do the helixes. But the diameters of the helixes contract, so the strands themselves do not elongate. Consequently, the towline can elongate in response to tension and thereby absorb energy without placing any significant tensile stress on the electrical conductors used for electrical communication between a moving craft and a deployed drogue.
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Askin Laramie E.
Sanders Associates Inc.
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