| 摘要 |
<p>A device indirectly connects an outlet of a feed chamber of an optical fibre installation unit to an open end of a preformed tube, e.g. one that is pre-installed in a building, in order to enable one or more optical fibres to be introduced into the tube by the viscous drag of a flow of gas. The device comprises a flexible hose (6) one end of which can be connected to the feed chamber outlet, the hose having a number of insulated electrical conductors (36) extending along its length. At the other end of the hose is a coupler (1) which comprises a tubular spigot (8) for forming a spigot and socket connection to a connector associated with the tube, an electric safety switch (28) operatively coupled to the spigot and electrically connected to one of the conductors (36) which can be electrically connected to signal means associated with the feed chamber. The coupler (1) includes at least one electrically operated exhaust valve (30) electrically connected to another of the conductors (36) and can be connected to control means associated with the feed chamber so that when a connection has been made between the coupler (1) and a hose a signal can be sent to the control system to close the valves (30) and to commence introduction of the optical fibre(s). The coupler (1) may be provided with one or more triggers (12,14) to enable disconnection of the spigot (8) from the hose and to actuate an override switch that can override the safety switch (28) so that a further length of fibre can be introduced by the feed chamber once the coupler has been disconnected from the tube, thereby enabling the installed fibre to be terminated.</p> |
