Automatic bucket positioning mechanism

Claim 1

IN THE COMBINATION COMPRISING A MATERIAL HANDLING IMPLEMENT PIVOTALLY MOUNTED ON BOOM MEANS FOR MOVEMENT TOWARD AND FROM A PREDETERMINED POSITION RELATIVE THERETO, SAID BOOM MEANS BEING PIVOTALLY MOUNTED FOR RAISING AND LOWERING MOVEMENT THEREOF, AND FLUID PRESSURE OPERATED IMPLEMENT AND BOOM MEANS JACKS RESPECTIVELY OPERABLE TO MOVE SAID IMPLEMENT AND BOOM MEANS; THE IMPROVEMENT COMPRISING FLUID CIRCUIT INTERCONNECTING SAID IMPLEMENT AND BOOM MEANS JACKS, AND CONTROL VALVE MEANS IN SAID CIRCUIT MEANS OPERABLY CONNECTED TO SAID IMPLEMENT TO SENSE A POSITION OF THE LATTER DISPLACED FROM SAID PREDETERMINED POSITION THEREOF, SAID CONTROL VALVE MEANS BEING OPERABLE AUTOMATICALLY IN RESPONSE TO DISPLACEMENT OF SAID IMPLEMENT FROM SAID PREDETERMINED POSITION THEREOF AND ACTUATION OF SAID BOOM MEANS TO LOWER THE LATTER TO MOVE SAID IMPLEMENT TOWARD SAID PREDETERMINED POSITION THEREOF.