Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – By fluid pressure differential in conduit
Patent
1994-05-24
1995-12-12
Kisliuk, Bruce M.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
By fluid pressure differential in conduit
B66F 300
Patent
active
054742773
ABSTRACT:
A partially leaky pulling plug (10) coupled to the foremost end (8) of a cable (4) which is to be pulled through a tubular cable conduit (6) with the aid of drag forces of a flowing medium, 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:
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patent: 5121644 (1992-06-01), Grey et al.
"The Installation of Conventional Fiber-Optic Cables in Conduits Using the Viscous Flow of Air", by Willem Griffioen, Feb. 1989, IEEE, pp. 297-302.
Kisliuk Bruce M.
Koninklijke PTT Nederland N.V.
Morgan Eileen P.
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