Actuating mechanism for gas turbine engine nozzles

Claim 1

A movable vane assembly of the type used in a gas turbine engine or compressor for interaction with a gas stream comprising: a plurality of radially aligned vanes circumferentially arranged within an annular passage formed by a first housing, said vanes being supported for rotation about their radial axes to vary the effective cross sectional area of said annular passage, a plurality of rotatable gear means connected for rotation with said plurality of aligned vanes, a ring gear having teeth means adapted for simultaneous engagement with the teeth means of said plurality of rotatable gear means such that rotation of the ring gear causes rotation of said plurality of vanes, actuating means for selectively rotating said ring gear, said actuation means including first and second link means connected at first and second diametrically opposed points on the periphery of said ring gear, and first motor means for simultaneously actuating said first and second links to rotate said ring gear, said actuating means further including first and second bell crank means connected between said first and second links and said first motor means, first lever means connected by rod means for movement with said fluid motor, said first lever means being fixed for rotation upon a first shaft, and second lever means also fixed for rotation upon said first shaft and connected for movement with said link means.