Implements or apparatus for applying pushing or pulling force – Method or apparatus for placement of conductive wire – By fluid pressure differential in conduit
Patent
1991-02-27
1993-04-27
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Method or apparatus for placement of conductive wire
By fluid pressure differential in conduit
B66F 324
Patent
active
052055426
ABSTRACT:
An apparatus and method for introducing a transmission line into a duct through which it is to be propelled by viscous drag of fluid propellant. A high local flow of fluid is created by inputting fluid, preferably compressed air, adjacent the input of the transmission line to the duct and bleeding a proportion of the fluid from the duct a short distance along from the input. This local flow provides the driving force to progress the transmission line along the first third of the duct against the hydrostatic potential. The extent of the venting via the bleed valve is controllable to control the driving force on the transmission line. This technique is especially useful for transmission lines including optical fibres.
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patent: 4691896 (1987-09-01), Reeve et al.
patent: 4756510 (1988-07-01), Klamm
patent: 4856760 (1989-08-01), Frost et al.
British Telecommunications Public Limited
Watson Robert C.
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