Apparatus for pulling long runs of fiber optic cable

Details Apparatus for pulling long runs of fiber optic cable Apparatus for pulling long runs of fiber optic cable

1986-01-10

1987-06-02

Schmidt, Frederick R.

Implements or apparatus for applying pushing or pulling force

Method or apparatus for placement of conductive wire

Conduit snakes

H02G 108

Patent

active

046697055

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.

REFERENCES:
patent: 4270734 (1981-06-01), Straight
patent: 4454999 (1984-06-01), Woodruff
patent: 4456225 (1984-06-01), Lucas
patent: 4468003 (1984-08-01), Nonclercq et al.
patent: 4502666 (1985-03-01), Mattelon et al.
patent: 4508281 (1985-04-01), Plater

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