Patent ID: 9101944
Filing Date: 2015-08-11
Classification: B04B

Abstract:
1. A drive for rotating a first structure at a first angular velocity relative to a stationary support and rotating a second structure at a second angular velocity relative to the stationary support about a common axis of rotation, the drive comprising: a rotatable drive shaft supporting the first structure; a drive motor operatively engaging, directly or indirectly, the drive shaft for rotating the first structure; the second structure mounted to the first structure so as to be rotatable relative to the first structure about the common axis of rotation; a first stationary shaft mounted interior of the drive shaft; a first gear mounted to the first stationary shaft so as to be coaxial with the common axis of rotation and rotatably fixed relative to the stationary support; a second gear rotatably mounted to the first structure so as to rotate with the first structure about the common axis and axially rotate relative to the first structure, the second gear operatively engaging, directly or indirectly, the first gear to rotate the second gear relative to the first structure upon rotation of the first structure by the drive motor; a third gear rotatably mounted to the first structure so as to rotate with the first structure about the common axis and axially rotate relative to the first structure synchronously with and at the same rate of rotation as the second gear; and a fourth gear fixed to the second structure for rotation therewith about the common axis, the fourth gear operatively engaging, directly or indirectly, the third gear to rotate the second structure relative to the first structure upon rotation of the first structure by the drive motor.