Mounting for attaching a tubular member in co-axial registration with an aperture in a wall

Claim 1

A gas turbine engine including a turbine, ducting positioned upstream and downstream of said turbine and defining a working fluid passage through said turbine, the ducting including a tubular nozzle shroud member, supporting structure for said shroud member, said shroud member having at one end thereof a spigot which is to be fitted into an aperture in said supporting structure, and a mounting supporting the tubular nozzle shroud member in co-axial registration with the aperture in said supporting structure, said mounting comprising said spigot, which is of complementary shape to said aperture, a plurality of radially outwardly extending lugs spaced apart around the periphery of said spigot, and the supporting structure having a corresponding number of notches spaced apart around the periphery of the aperture, said lugs when aligned with the notches being insertable through said notches by axial movement of said tubular member and retained, in the manner of a bayonet-type of coupling, by portions of said supporting structure between said notches when said tubular member has been partly turned abouts its longitudinal axis, said tubular member also having a flange spaced axially from said lugs and sealingly engageable with said supporting structure when said lugs are located behind said portions between said notches, said lugs and said flange together holding said tubular member from axial movement with respect to said supporting structure, said supporting structure and said flange each having a pin-receiving opening therein, said openings being so positioned in said supporting structure and said flange respectively that when said tubular member has been turned to said retained position said openings are in registration one with the other, a removable locking pin insertable in said registered openings to prevent turning of said tubular member from said retained position, one of said openings being elongate in a direction radially of the longitudinal axis of said tubular member to permit limited relative movement between said tubular member and said supporting structure.