Ground driven disc cultivator

Claim 1

A CULTIVATOR ATTACHMENT ADAPTED TO BE CONNECTED TO AND PROPELLED BY A TRACTOR, SAID ATTACHMENT COMPRISING A PLURALITY OF SIDE-BY-SIDE GENERALLY HORIZONTAL SUPPORT UNITS, MEANS MOUNTING SAID SUPPORT UNITS AT THEIR FORWARD PORTIONS FOR FREE, INDIVIDUAL VERTICAL TILTING ABOUT GENERALLY HORIZONTAL AXES EXTENDING TRANSVERSELY OF THE PATH OF MOVEMENT OF THE ASSOCIATED TRACTOR, SUPPORT MEANS CONNECTED TO EACH SUPPORT UNIT AND LIMITING INDIVIDUAL DOWNWARD TILTING WHILE ALLOWING INDIVIDUAL UPWARD TILTING OF EACH UNIT, A CULTIVATOR TOOL MOUNTED UPON AND EXTENDING DOWNWARDLY FROM THE REAR PORTION OF EACH UNIT, A PAIR OF SHOES RIGIDLY SUPPORTED FROM THE REAR END PORTION OF EACH SUPPORT UNIT, DISPOSED ON OPPOSITE SIDES OF THE CORRESPONDING TOOL AND POSITIONED TO RAKE AND DIRECT SOIL UPON THE FURROW OPENED BY SAID TOOL, SAID SHOES EACH COMPRISING AN UPSTANDING PLATE-LIKE KNIFE SURFACE MEANS EXTENDING GENERALLY NORMAL TO SAID AXES AND INCLUDING A GENERALLY HORIZONTALLY STRAIGHT FORWARD END PORTION PROJECTING FORWARDLY OF THE CORRESPONDING TOOL AND A REAR END PORTION WHICH EXTENDS REARWARDLY OF AND IS INCLINED SLIGHTLY INWARDLY BEHIND THE CORRESPONDING TOOL, EACH OF SAID SUPPORT UNITS INCLUDING OPPOSITE SIDE DEPENDINGLY SUPPORTED CULTIVATOR DISC MEANS SPACED FORWARDLY OF AND ALIGNED WITH SAID FORWARD END PORTIONS OF SAID SURFACE KNIFE MEANS, THE ADJACENT KNIFE MEANS OF ADJACENT SUPPORT UNITS BEING LATERALLY SPACED APART A DISTANCE ADAPTED TO CLOSELY RECEIVE THEREBETWEEN A ROW OF YOUNG PLANTS.