Title:
【発明の名称】伝送線の布設方法および装置
Document Type and Number:
Japanese Patent JP2896400
Kind Code:
B2
Abstract:
An apparatus and method for introducing a transmission line (5) into a duct (1) through which it is to be propelled by viscous drag of a 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 (5). This technique is especially useful for transmission lines including optical fibres.
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Inventors:
KIIBURU PIITA JON
Application Number:
JP50275488A
Publication Date:
May 31, 1999
Filing Date:
March 23, 1988
Export Citation:
Assignee:
BURITEITSUSHU TEREKOMYUNIKEESHONZU PLC
International Classes:
G02B6/46; G02B6/44; H02G1/08; (IPC1-7): G02B6/46; H02G1/08
Other References:
【文献】米国特許3654114(US,A)
【文献】欧州公開108590(EP,A1)
【文献】欧州公開108590(EP,A1)
Attorney, Agent or Firm:
Naotaka Ide