| 摘要 |
Apparatus for use in positioning a unit successively relative to a plurality of tubes of a regular array of tubes supported by a tube-plate within an enclosure provided with an access opening, e.g. relative to the boiler tubes of a steam generator of a nuclear power station, as described in U.S. Pat. No. 4,004,698 is adapted for association with transporting apparatus for placing the positioning apparatus in the enclosure, the transporting apparatus comprising a rectilinear guide rod for passing through the access opening and for guiding a carriage provided with a coupling assembly for releasably coupling the positioning apparatus to the carriage during movement thereof between the outside and the inside of the enclosure and which are disconnectable to permit movement of the positioning apparatus across the tube-plate.
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