Subsoiling machine

A movable implement for loosening soil below ground, comprising:

• a row of blades with blade holders perpendicular to a direction of motion of said implement;
• a supporting arm having one end articulated to each of said blades;
• a frame articulated to another end of said supporting arm;
• a connecting rod of crank means engaging said supporting arm and operating in a vertical plane parallel to said direction of motion;
• a blade adjustment lever with two arms mounted on said supporting arm and pivoting coaxially with an articulating shaft;
• a stop mounted on a downward-extending arm of said blade-adjustment lever and pointing below said articulating shaft;
• lever-adjusting means engaging an upward-extending arm of said blade-adjustment lever and having a variable angle to said supporting arm and varying thereby the angle of the blade to said ground;
• spring means forcing a blade holder for said blades against said stop;
• said soil exerting a resistance forcing said blades away from said stop during movement of said implement.