Patent ID: 8511974

Claim:
A control mechanism for moving at least two components of a gas turbine engine, the control mechanism comprising: a moveable actuation rod, a first linkage arrangement which includes a first bell crank, wherein the first linkage arrangement operatively connects the actuation rod to a first component of the gas turbine engine such that movement of the actuation rod produces an output motion of the first bell crank which in turn drives movement of the first component, and a second linkage arrangement which includes a second bell crank, wherein the second linkage arrangement operatively connects the actuation rod to a second component of the gas turbine engine such that movement of the actuation rod produces an output motion of the second bell crank which in turn drives movement of the second component; wherein the first linkage arrangement and the second linkage arrangement are configured so that over a predetermined range of movement of the actuation rod the first component is moved by the first bell crank while the second component is not moved by the second bell crank, and wherein the first and second components are respective unison rings.