Soil cultivator

A soil cultivator comprising a supporting frame;

• means for attachment of said frame to a tractor;
• a first lever arm pivoted at one end to said frame, a second lever arm pivoted at an intermediate position to the other end of said first lever arm, said second lever arm being provided with a first arm portion extending downwardly below said intermediate pivot point and having secured thereto a shovel or the like soil working tool, and with a second arm portion integral with said first arm portion and extending upwardly above said intermediate pivot point, a fixed guide element secured to said support frame, the free end of said second arm portion being in sliding engagement with and being urged downwardly along said guide element by spring means while being caused to slide upwardly along said guide means in opposition to the force of said spring by effect of the resistance opposed by the soil to the progress of the working tool, so as to only partially lift the working tool with respect to the soil by an amount proportional to the soil resistance encountered, while maintaining it at all times in substantial operating and working engagement with the soil without substantially changing its angle of attack with respect thereto.