Elevational control mechanism for an implement carrier

Claim 1

IN A VEHICLE, A SUPPORT MOUNTED FOR BOTH FORWARD AND REARWARD EARTH TRAVERSING MOVEMENT ALONG A PREDETERMINED PATH, AN IMPLEMENT CARRIER, MEANS MOUNTING SAID CARRIER ON THE SUPPORT FOR ELEVATIONALLY ADJUSTABLE MOVEMENT, FLUID CONTROL MEANS MOUNTED ON SAID SUPPORT AND CONNECTED TO SAID CARRIER FOR RAISING AND LOWERING SAID CARRIER AND INCLUDING A POWER CYLINDER CONNECTED TO SAID CARRIER, A VALVE ARRANGED WHEN ACTUATED TO CONTROL FLOW OF FLUID TO SAID CYLINDER, GROUND ENGAGING MEANS CONNECTED TO SAID CARRIER FOR SENSING THE CHANGES IN THE CONTOUR OF TERRAIN TRAVERSED DURING FORWARD MOVEMENT OF SAID SUPPORT, MEANS OPERABLY INTERCONNECTING SAID GROUND ENGAGING MEANS AND SAID VALVE FOR ACTUATING SAID VALVE TO ENERGIZE SAID CYLINDER AND THUS RAISE AND LOWER SAID CARRIER IN RESPONSE TO RAISE AND FALL OF SAID GROUND ENGAGING MEANS DURING SAID FORWARD MOVEMENT, AND MEANS ON SAID SUPPORT FOR EFFECTING REARWARD MOVEMENT THEREOF AND BEING OPERABLY ASSOCIATED WITH SAID INTERCONNECTING MEANS FOR RAISING SAID GROUND ENGAGING MEANS ANF THUS SAID CARRIER DURING REARWARD MOVEMENT OF SAID SUPPORT.