Title: Gas turbine engines

Abstract: A seal clearance control device for maintaining a radial clearance between turbine blade tips and the surrounding seal ring. The shroud is controlled by a relatively fast response ring and a relatively slow ring the fast ring serving to control the radial growth of the sealing ring and the slow ring serving to control the radial contraction of the seal ring.

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Inventors: Needham, Peter Richard (Bristol, EN)
Langley, Kenneth Richard (Wotton-under-Edge, EN)

Application Number: 634849
Filing Date: 1975-11-24
Publication_date: 1977-09-27
Assignee: Rolls-Royce (1971) Limited (EN)
Primary Class(es): 415/116 415/136
Other Classes:
US Patent Ref:

3146992	Sep, 1964	Farrell	415/12.
3520635	Jul, 1970	Killman et al.	415/136.
3807891	Apr, 1974	McDow et al.	415/134.
3860358	Jan, 1975	Cavicche et al.	415/134.
3966354	Jun, 1976	Patterson	415/116.

Other Refs:
Primary Examiner: Croyle, Carlton R.
Assistant Examiner: Casaregola, L. F.
Attorney: Stevens, Davis, Miller & Mosher