Patent ID: 8678478

Claim:
A machine comprising: a frame; an operator cab supported by the frame; an external roll-over protection structure; one or more passive mounts mounted between the cab and the frame; one or more controllable mounts mounted between the cab and the external roll-over protection structure, wherein the one or more passive mounts positioned near an inertial pitch axis of the cab and the one or more controllable mounts positioned remotely from the inertial pitch axis of the cab, the one or more controllable mounts including: a housing; a pin mounted within the housing; a rheological fluid within the housing; and coils positioned relative to the housing to generate a field through the rheological fluid; and an electronic control unit operatively associated with the coils and adapted to change a level of current applied to the coils to adjust an apparent viscosity of the rheological fluid to actively change the damping characteristics of the one or more controllable mounts.