Variable van drive mechanism

In an axial flow gas turbine engine of the type having variable inlet guide vanes operable by rotating a unison ring circumferentially about the engine case, the improvement which comprises:

• a plurality of flexible drive lever arms extending from the unison ring, one each to a post at the radially outward end of a corresponding inlet guide vane;
• and
• means for attaching the drive lever arm to the post which includes a post end having a polyhedral geometry which is tapered to a smaller area cross section at the most outward end thereof, a receptacle on the drive lever arm of a geometry corresponding to the geometry of the post, and a bolt passing through the lever arm into the vane post for holding the lever arm and post in tight engagement to prevent wear under vibratory loading.