Title: Platform for a swing root turbomachinery blade

Abstract: A rotor apparatus comprising a blade having a root adapted to swing laterally within a supporting spindle under impact loading is provided with a flow path defining platform. The platform comprises an inner shroud extending generally laterally of the blade airfoil portion and adapted to swing laterally therewith. In one embodiment wherein the blade primarily comprises a laminate of composite filament plies, the inner shroud is bonded to the laminate. An outer shroud, fixed with respect to the supporting spindle, forms a lateral extension of the inner shroud with the blade in its normal operating position. The inner and outer shrouds are provided with a pair of complementary adjacent surfaces contoured to pass in relatively close-fitting relationship to each other when the blade swings under impact loadings.

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Inventors: Ravenhall, Richard (Cincinnati, OH, US)

Application Number: 654787
Filing Date: 1976-02-03
Publication_date: 1977-08-30
Assignee: The United States of America as represented by the Administrator of the (Washington, DC)
Primary Class(es): 416/135 416/190, 416/193A, 416/241A
Other Classes:
US Patent Ref:

2877980	Mar, 1959	Stalker	416/190.
2936155	May, 1960	Howell et al.	416/134.
2967043	Jan, 1961	Dennis	416/221.
3487879	Jan, 1970	McCarthy et al.	416/220.
3656864	Apr, 1972	Wagle	416/193.
3801222	Apr, 1974	Violette	416/220.
3860361	Jan, 1975	McMurtry et al.	416/131.
3905722	Sep, 1975	Guy et al.	416/193.

Other Refs: 1,341,910

Sep, 1963	FR

Primary Examiner: Powell, Jr., Everette A.
Assistant Examiner:
Attorney: Musial; Norman T., Lawrence; Derek P., Lampe, Jr.; Robert C.