Plow with symmetrical bodies having concave vertical and horizontal cross-sections

A plow system adapted to be pulled by a pulling means and further adapted for two-way plowing whereby the plow will throw plowed earth in a first geographic direction to a first side of the pulling means when the pulling means advances in a first geographic sense, and, when the pulling means returns in a second geographic sense, 180.degree. from the said first geographic sense, will throw plowed earth in the same said first geographic direction but to the opposite side of the returning pulling means, the plow system including:

• at least one moldboard (11);
• a first support means (10) for supporting said moldboard (11), said first support means (10) being operatively connected to said moldboard (11);
• a second support means for supporting said first support means, said second support means including a main beam (8), the first support means being pivotably connected to the second support means;
• means for connecting (1, 4) said second support means to the said pulling means so that the second support means is positioned at an acute angle to the direction of travel of said pulling means with the forward portion of the second support means directed to one side of the pulling means when the pulling means advances in a first geographical sense so as to throw plowed earth in said first geographical direction;
• means for altering (17, 18) the relation of the second support means to the pulling means so that the forward portion of the second support means is directed to the opposite side of the pulling means when the pulling means returns in a second geographical sense, 180.degree. from the said first geographical sense so as to throw plowed earth in the same said first geographical direction;
• said moldboard (11) having a surface which contacts and throws the earth being plowed which is at least partially concave, this concave surface being concave in its horizontal section (46) as well as being concave in its vertical section (47), wherein the said surface of the moldboard has a concavity in its horizontal section which has a substantially shorter radius of curvature at the upper portion of the moldboard than at the lower portion of the moldboard.