Apparatus for harvesting sub-surface crops

Claim 1

IN A HARVESTER FOR SUB-SURFACE CROPS ADAPTED FOR ATTACHMENT TO A TRACTOR HAVING DRAFT MEANS AND LIFT MEANS OPERATIVELY CONNECTED TO SAID DRAFT MEANS FOR RAISING AND LOWERING SAID DRAFT MEANS, A PLOW FRAME OPERATIVELY CONNECTED TO SAID DRAFT MEANS TO BE RAISED AND LOWERED THEREWITH, A GROUND ENGAGING PLOW CARRIED BY SAID PLOW FRAME AND DISPOSED TO MOVE TO OPERATIVE POSITION UPON LOWERING SAID PLOW FRAME, A REARWARDLY EXTENDING MAIN FRAME PIVOTALLY SUPPORTED ADJACENT ITS FORWARD END BY SAID PLOW FRAME AND ADAPTED FOR VERTICAL MOVEMENT RELATIVE THERETO WHEREBY SAID PLOW FRAME IS ADAPTED FOR INDEPENDENT MOVEMENT RELATIVE TO SAID MAIN FRAME, MEANS LIMITING VERTICAL MOVEMENT OF SAID PLOW FRAME RELATIVE TO SAID MAIN FRAME UPON LIFTING SAID PLOW FRAME WHEREBY SAID MAIN FRAME MOVES UPWARDLY WITH SAID PLOW FRAME AFTER SAID PLOW FRAME HAS BEEN LIFTED A PREDETERMINED AMOUNT, DEPENDING GROUND ENGAGING MEANS MOUNTED ADJACENT THE REAR OF SAID MAIN FRAME DISPOSED TO SUPPORT THE REAR END OF SAID MAIN FRAME UPON LOWERING SAID PLOW FRAME TO OPERATIVE POSITION, A DOWNWARDLY AND FORWARDLY SLOPING CONVEYOR FRAME MOUNTED ADJACENT ITS UPPER END TO THE REAR OF SAID MAIN FRAME AND ADAPTED FOR PIVOTAL MOVEMENT RELATIVE TO SAID MAIN FRAME AND SAID PLOW FRAME, AND A DOWNWARDLY AND FORWARDLY SLOPING PICK-UP CONVEYOR CARRIED BY SAID CONVEYOR FRAME TO PICK UP AND DELIVER REARWARDLY THE CROP PLOWED UP BY SAID PLOW.