US Patent 7540331 Soil working implement with retractable wheels

A soil working implement is dragged behind a towing vehicle. The implement includes a hitch part and a soil working part. The soil working part may be pivoted about the hitch part by extending or retracting a longitudinal linkage member interposed between the hitch part and the soil working part. Wheels are mounted on the implement and may be raised and lowered relative to the implement by an operator-actuated mechanism, to thereby permit the soil working part to be raised off of the ground by lowering the wheels to thereby facilitate movement of the implement from one treatment area to another, whereupon the wheels may be raised to permit the soil working part to engage the soil.