This is the Disk Lift, one of the Ball-Lifting Mechanisms used in Rolling Ball Sculptures. Details and videos of this and other lifts can be found in the Complex Lifting Mechanisms page of EddiesMind.com.
Rolling Ball Sculpture by Jeffrey Zachmann & photo by Mark Olejarczyk
Kinetic Rolling Ball Desktop Sculpture Dropping by TomHaroldArt
Factory, a multi-track rolling ball sculpture by Californian Larry Lawrence. Sculpture features adjustable speed settings depending on how much "work" you want to get done!