A drive mechanism for a bimini top with a pair of bimini arms supporting the bimini top includes a motor, a worm screw coupled with the motor for rotation by the motor, and a driven gear coupled with the worm screw. One of the pair of bimini arms is connected to the driven gear, and the driven gear is configured for displacement between a stowed position and an extended position by operation of the motor. A pivot hub engages the driven gear via an intermediate hub, and the other of the pair of bimini arms is connected to the pivot hub. The pivot hub and intermediate hub are configured for displacement between a down position and an up position by operation of the motor through the driven gear and the intermediate hub. A first arc spanned by the driven gear between the stowed position and the extended position is greater than a second arc spanned by the pivot hub between the down position and the up position.