Plow disk of the type intended to be mounted free in rotation on a shaft integral with the frame of a plow

A plow disk for mounting with a plurality of disks of the same nature on a frame of a plow, free in rotation about an axis parallel to the ground, but angled relative to a direction of advance of said plow in order to impart a movement of rotation to said plurality of disks during advance of said plow, each of said disks having a periphery constituted by a plurality of blades each comprising:

• a first convex leading cutting edge having an inner extremity directed toward a center of said disk and an outer extremity at said periphery of said disk, a shape of said first convex leading cutting edge being such that when going from said inner extremity to said outer extremity a radial line toward said center of said disk is always moving angularly in a same direction,
• a second cutting edge adjacent to said first convex leading cutting edge, a shape of which is substantially arcuate with its center located at said center of said disk, the length of said second arcuate cutting edge being substantially shorter than the length of said first convex leading cutting edge,
• a back concave trailing edge adjacent to said second arcuate cutting edge which is directed substantially in the direction of said center of said disk,
• the length of said second cutting edge being substantially smaller than a distance between said second cutting edges of two adjacent blades,
• each blade having a crosswise dimension which decreases while moving away from said axis of rotation, and
• a position of said disk on said plow being such that a first convex leading cutting edge of each blade is directed toward said direction of advance of said plow when said blade enters the ground.