Patent ID: 8196936

Claim:
In combination with at least one of a tractor, lawnmower and cutting deck having one of a frame and a body and a plurality of wheels disposed underneath thereof, a suspension apparatus for independently controlling attitude of each wheel, said suspension apparatus comprising: (a) a plurality of screw drive assemblies, each of said plurality of screw drive assemblies having a stationary portion thereof attached to said one of said frame and said body, an end of a moveable portion thereof connected to a respective wheel and an electric motor coupled to a source of electric power and rotatable in a first direction for moving said respective wheel away from said one of said frame and said body upon receiving a first command signal, said electric motor rotatable in an opposite direction for moving said respective wheel toward said one of said frame and said body upon receiving a second command signal; and (b) at least one tilt sensor mounted in a predetermined position on said at least one of tractor, lawnmower and cutting deck, said at least one tilt sensor enabling each of said first and second command signals.