Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1974-11-18
1977-02-01
Grimley, Arthur T.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
174107, 174108, 174115, 174131A, H01B 1722
Patent
active
040062899
ABSTRACT:
An electromechanical cable is adapted for deployment along a generally straight path and when thus deployed to be substantially free of torsional reactions resulting from changes in tensile stress in the longitudinal direction of the cable. The cable includes a plurality of strain members arranged in an annular configuration. When the cable lies straight and untwisted the strain members are also straight, parallel to the longitudinal axis of the cable and parallel to each other. The strain members are loosely confined within the cable structure so that when the cable is subsequently twisted they are free to move into helical positions relative to the axis of the cable.
The cable is first wound into a coil and concurrently pretwisted about its own axis by approximately 360.degree. for each loop of the coil. After being transported to the deployment site, the cable is pulled off the coil without relative rotation between the delivered end of the cable and the coil, so that the pretwist of the cable is relieved. The cable is then ready to carry a varying longitudinal tensile load without inducing significant torque or twisting action.
In one form of the invention the strain members are sandwiched between a sheath and an insulated core. In another form of the invention the strain members are disposed centrally of the cable and constitute a part of its inner core.
REFERENCES:
patent: 1705913 (1929-03-01), Gilbert
patent: 2509894 (1950-05-01), Toulmin, Jr. et al.
patent: 2589507 (1952-03-01), Noyes
patent: 2870311 (1959-01-01), Greenfield et al.
patent: 3259684 (1966-07-01), Wakefield
patent: 3261907 (1966-07-01), Morrison
patent: 3522699 (1970-08-01), Popradi
patent: 3584139 (1971-06-01), Swanson
patent: 3717720 (1973-02-01), Snellman
patent: 3798350 (1974-03-01), Clarke
patent: 3842584 (1974-10-01), Schmittman
Brown Gordon W.
Roe Norman P.
Consolidated Products Corporation
Grimley Arthur T.
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