Patent ID: 7588415

Claim:
A variable vane assembly having a plurality of rotatable stator vanes radially arranged between an inner diameter vane shroud and an outer diameter fan case, the variable vane assembly characterized by: the plurality of rotatable stator vanes, each vane comprising; a blade portion; an outer diameter end for rotating in the outer diameter fan case; an inner diameter end for rotating in the inner diameter vane shroud, the inner diameter end comprising: a trunnion for rotating within a socket in the inner diameter vane shroud; a quadrangular arm post extending generally radially from the trunnion for receiving a vane arm; a fastener channel extending generally radially into the arm post and the trunnion; a fastener having a head and a shaft, the shaft extending into the fastener channel; and a button having an inner channel surrounding a portion of the shaft such that the head of the fastener biases the button against the arm post; a synch ring rotatably located in an inner channel defined by the inner diameter vane shroud; and a plurality of vane arms connecting the quadrangular arm posts of each stator vane of the plurality of rotatable stator vanes with the synch ring within the inner channel so that the plurality of rotatable stator vanes rotate synchronously.