US Patent 10024004 Variable eccentricity via sliding mechanism

A vibratory mechanism may include a support housing extending between a first end and a second end and disposed along a common axis of the drum assembly, a first shaft coupled to the first end of the support housing and rotatably movable about the common axis, a second shaft coupled to the second end of the support housing and axially movable along the common axis, an eccentric mass disposed between the first shaft and the second shaft and rotatable about a travel radius, a first link pivotally coupling the eccentric mass to the first shaft, and a second link pivotally coupling the eccentric mass to the second shaft.