Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – By fluid pressure differential in conduit
Patent
1992-07-31
1993-03-30
Swann, J. J.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
By fluid pressure differential in conduit
B65H 5900
Patent
active
051977150
ABSTRACT:
An improved method for installing a cable (4) in a tubular cable conduit (6) with the aid of the drag forces of a flowing medium by applying additional tensile forces by a partially leaky pulling plug (10) coupled to the foremost end (8) of the cable and a partially leaky pulling plug for carrying out the improved method. The plug is provided with a suitably dimensioned flow opening (12) for allowing the flow through of the flowing medium in a manner not reducing the drag forces considerably, however with a certain pressure difference (Px--Px') across the plug (10). This pressure difference imparts thrust to the plug. The thrust of the plug exerts additional tensile forces on the foremost end (8) of the cable. Preferably the plug has a circumferential suction seal with the inside wall (11) of the conduit (6), and the flow opening is dimensioned such that during installation the flow velocity in the flow opening is essentially equal to that of sound in the flowing medium. The flow opening (12) may be fixedly chosen or may vary in a pressure-dependent manner.
REFERENCES:
patent: 4185809 (1980-01-01), Jonnes
patent: 4733850 (1988-03-01), Thompson
patent: 4830538 (1989-05-01), Ueda
patent: 4934662 (1990-06-01), Griffioen
"The Installation of Conventional Fiber-Optic Cables in Conduits Using the Viscous Flow of Air", by Willem Griffioen, Feb. 1989, IEEE, pp. 297-302.
Koninklijke PTT Nederland N.V.
Swann J. J.
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