Patent ID: 7114919

Claim:
A guiding grid of variable geometry comprising: a plurality of guiding vanes ( 7 ) arranged around a central axis (R), each vane ( 7 ) being pivotal about a pivoting axis ( 8 ); a nozzle ring ( 6 ) for supporting said vanes ( 7 ) and their pivoting axes ( 8 ) around said central axis (R); a unison ring ( 5 ) which is pivotable around said central axis (R) relative to said nozzle ring ( 6 ); and a transmission mechanism ( 16 – 19 ) by which said unison ring ( 5 ) is connected to said vanes ( 7 ) for pivoting said vanes ( 7 ) about their respective pivoting axes ( 8 ), having a first transmission element ( 16 ) with an opening ( 18 ) in which a second transmission element ( 17 ) is slidably guided, wherein said second transmission element ( 17 ) is a drag lever ( 17 ) which is pivotably guided on an associated ring and in that said drag lever ( 17 ) immerges into said opening ( 18 ) of the first transmission element ( 16 ) in an approximately radial direction; wherein said drag lever ( 17 ) has a longitudinal axis (A, A′), wherein said longitudinal axis (A, A′) is bent with respect to its articulation point ( 19 ) measured as a bending angle (β), wherein said bending angle (β) is selected so that planes (P 1 , P 2 ) pass through the central axis (R), through the middle of each respective pivoting axis ( 8 ), and through the articulation point ( 19 ) of said drag lever ( 17 ), and wherein the bending angle (β) is an angle less than about 12°, and that an angle (γ) between the longitudinal axes of bent sections of the drag lever ( 17 ) is between about 170° to about 120°.