- Create a simple object as trend unit like this one.

- Adjust the pivot point and put it where it should rotate.

- Duplicate it 40 Times

- Make Joints over the geometry

- Make each joint parent to its geo unit

- Create a spline like this one

- Go to Animation Menu > Skeleton > IK Spline Handle Tool (Hit The Option Box)

- Deselect “Auto Create Curve” option

- Select the first joint then the last joint then the curve

- Adjust the curve control point to make them fit to your geometry

- Select the IK Handle then animate the Offset Attributes

Thats it . . . Hope you enjoy it . . . your comments and question are welcome