Patent ID: 7770657

Claim:
An agricultural tillage sweep adapted for forward movement through soil, the sweep comprising: a stem portion; a leading nose portion extending forwardly from the stem portion and having outwardly directed soil contacting surfaces for lifting the soil and moving the soil outwardly around the stem portion; wing structure extending outwardly from the stem portion and rearwardly from the leading nose portion, the wing structure including upwardly directed wing surfaces extending outwardly from the leading nose portion towards outer ends of the wing rearwardly of leading wing edges, the surfaces having an upwardly and outwardly concave surface portion extending rearwardly from the nose portion outwardly of the stem portion, the concave surface portion extending along a substantial portion of the wing structure from an inward location outwardly of the stem portion, the concave surface having a radius of curvature centered above the sweep and providing increasing outward soil deflection in the rearward direction; and wherein the leading nose portion diverges in the rearward direction at an angle of less than 45 degrees and includes generally flat soil contacting surfaces forming an angle of less than 30 degrees with horizontal to provide primarily soil lifting action and secondarily outward soil deflection dependent on forward operating speed.