Patent ID: 8261845

Claim:
A tillage machine comprising: a mobile frame having tillage tools supported thereon and presenting a front and a rear with respect to the normal direction of forward travel of the machine; a pair of laterally spaced wheel arms pivotally attached to the frame, each of said wheel arms being adapted for up and down swinging movement relative to the frame about a first transverse axis; a primary beam for each of said wheel arms and having a front end and a rear end with respect to the normal direction of forward travel of the machine, each of said primary beams being pivotally attached to its wheel arm at a point intermediate said front and rear ends of the primary beam for up and down rocking movement relative to the wheel arm about a second transverse axis; a first ground-engaging wheel rotatably attached to the front end of each primary beam respectively; a secondary beam for each primary beam and having a front end and a rear end with respect to the normal direction of forward travel of the machine, each of said secondary beams being pivotally attached to the rear end of its primary beam at a point intermediate the front and rear ends of the secondary beam for up and down rocking movement relative to the primary beam about a third transverse axis; a second ground-engaging wheel rotatably attached to the rear end of each secondary beam respectively; a third ground-engaging wheel rotatably attached to the front end of each secondary beam respectively; and hydraulic lift mechanism operably connected between the frame and said wheel arms for swinging the wheel arms up and down relative to the frame to raise and lower the frame relative to the ground, said primary beams having outboard sides with respect to the normal direction of forward travel of the machine that face away from one another and inboard sides with respect to the normal direction of forward travel of the machine that face toward one another, said first and second ground-engaging wheels being on the outboard sides of the primary beams and said third ground-engaging wheels being on the inboard sides of the primary beams.