초록 ▼

A transmission line, such as an optical fiber (or wire) transmission line, is installed by first installing a conduit having one or more bores and subsequently inserting flexible, lightweight optical fiber members containing the optical fibers into the bores. The optical fiber members are propelled

A transmission line, such as an optical fiber (or wire) transmission line, is installed by first installing a conduit having one or more bores and subsequently inserting flexible, lightweight optical fiber members containing the optical fibers into the bores. The optical fiber members are propelled by employing the fluid drag of air, or another suitable gas, passed at high velocity through the bores.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of advancing an elongate, flexible tubular element along a previously installed duct, said method comprising:a) inserting the free end of an elongate, flexible tubular element into the previously installed duct by applying to the tubular member a force in the d

[ What is claimed is:] [1.]1. A method of advancing an elongate, flexible tubular element along a previously installed duct, said method comprising:a) inserting the free end of an elongate, flexible tubular element into the previously installed duct by applying to the tubular member a force in the direction of insertion;b) inserting a gaseous medium into the pathway with a flow velocity much higher than the desired rate of advance of the tubular element along the duct; andc) propelling the free end and following portions of the tubular element along the duct by continuance of said insertion force in cooperation with the fluid drag of the gaseous medium passed along the length of the duct in the desired direction of advance, said gaseous medium having substantially higher velocity than said tubular element throughout the length of the duct.