Patent ID: 6880644

Claim:
A tillage tool comprising: a transverse tool bar adapted to be positioned at a predetermined height above the ground as the tool is advanced along a path of travel; a shank assembly attached to said tool bar and including a generally upright shank having a tillage point at its lower end for lifting and fracturing the subsoil as the shank is advanced; a pair of ground-engaging wheels located on opposite lateral sides of the shank above and behind the point; and a pair of springs on opposite lateral sides of the shank independently mounting the corresponding ground wheels to the shank assembly for individual up and down movement of the wheels under the resistance of the respective springs as the wheels ride along and firm up soil tending to erupt on opposite sides of the shank, each of said springs comprising a leaf spring, each of said leaf springs being provided with anti-twist structure operable to prevent the leaf spring from twisting as it flexes during up and down movement, said anti-twist structure for each leaf spring including an upright, stationary guide secured to the shank assembly and a follower secured to said leaf spring for movement therewith in engagement with said guide.