Fastening device for coupling of blades in agricultural cultivation machines

Fastening device for coupling of blades in an agricultural cultivation machine, wherein the blades are linked on a rotary plate integral to the cultivation machine, comprising:

• an intermediate fastening element which attaches a blade to the rotary plate, said intermediate fastening element including:
• a solid body;
• a fastening arrangement for attaching the fastening element to the rotary plate;
• a guiding arrangement for inserting the blade into the intermediate fastening element, the guiding arrangement for inserting the blade including two opposite grooves arranged partially along a perimeter on a contact face of the solid body with the blade slidably retained within the grooves and with each groove including a portion that overlies the blade slid into the groove;
• and
• at least one through hole transverse to the direction of the guiding arrangement;
• and
• a removable pin removably insertable into the at least one through hole and which, in an insertion position of said pin, acts as a retention element for the blade with respect to the intermediate fastening element, said removable pin having an R-shape with a linear portion that extends into the one through hole, a grasping portion connected to one end of the linear portion by a connecting portion, and said grasping portion is positioned above through hole and said blade for removal of the pin manually without any accessory tool.