Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – Conduit snakes
Patent
1987-06-01
1988-07-19
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
Conduit snakes
E21C 2916
Patent
active
047579765
ABSTRACT:
A fiber optic cable pulling method and apparatus includes a series of large-diameter capstan winches placed at intermediate access points along the conduit through which the fiber optic cable is to be pulled. Each capstan winch pulls a portion of the cable through a segment of the conduit at a substantially uniform velocity. The capstan wheel of each winch is sized frictionally to engage the cable without exceeding its minimum bending radius. The winches are independently controlled by controllers which limit the rate of hydraulic fluid and its pressure flowing to the hydraulically powered winch, and thereby maintain pulling tension on each portion of the cable below a predetermined tension, if exceeded, which could damage the fiber optics in the cable. The capstan winches are spaced sufficiently close together so that the pulling tension necessary to pull a portion of cable through each conduit segment is ordinarily less than the tension provided by the capstan winches. If a portion of the cable catches in a segment of conduit, the winches cease pulling along the entire length of the cable.
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