Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – By means advancing along terrain and guiding pipe or cable...
Patent
1995-02-06
1997-06-24
Graysay, Tamara L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
By means advancing along terrain and guiding pipe or cable...
405180, H02G 106, F16L 1028
Patent
active
056412460
ABSTRACT:
A method of laying cable such as fiber optic cable which cannot be twisted past an obstacle includes rewinding the cable from the inner end through an excavation under the obstacle from a first reel onto a second reel downstream of the obstacle. Both the first and second reels are of a type having first and second end flanges both of which are removable from the reel and a radially collapsible hub. During the rewinding step, the supply reel from the plough is positioned on end and the cable withdrawn from the inner turns of the winding and pulled off over end thus introducing a turn of twist. The key to the system is that when the second reel is unwound at the obstacle it is inverted relative to the first reel so that the second end is uppermost thus causing the twist to be subtracted and cancelled rather than summated.
REFERENCES:
patent: 4871127 (1989-10-01), Clark
patent: 4890957 (1990-01-01), Rinas
patent: 5156355 (1992-10-01), Wadle
Battison Adrian D.
Graysay Tamara L.
Lagman Frederick L.
Thrift Murray E.
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