Submarine scraper

Claim 1

AN EARTH MOVING SCRAPER COMPRISING A CHASSIS, WHEELS ON WHICH THE CHASSIS IS SUPPORTED FOR MOVEMENT IN A FORE AND AFT DIRECTION OVER THE SURFACE OF THE GROUND, AN EARTH CARRYING FORE AND AFT BUCKET HAVING A CUTTING EDGE AT ITS FORE END SLIDABLY AND PIVOTALLY SECURED AT ITS FORE END AND AFTER END TO THE CHASSIS FOR VERTICAL MOVEMENT OF SAID FORE END BETWEEN A FIRST POSITION IN WHICH THE CUTTING EDGE EXTENDS BELOW THE SURFACE OF THE GROUND TO A SECOND POSITION IN WHICH SAID CUTTING EDGE LIES ABOVE SAID SURFACE, SAID BUCKET BEING NORMALLY BIASED BY WEIGHT THEREOF TO SAID FIRST POSITION, SAID AFTER END BEING MOVABLE FROM A NORMAL WEIGHT-BIASED LOWER POSITION TO AN UPPER POSITION IN WHICH SAID AFTER END IS ELEVATED ABOVE THE FORE END, A HAUL-IN CABLE SECURED TO THE SCRAPER AT ITS FORE END TO MOVE THE LATTER FORWARDLY, MEANS CONNECTING THE FORE END OF THE BUCKET AND SAID CABLE AND OPERABLE UPON TENSION BEING APPLIED TO SAID CABLE TO MOVE SAID FORE END FROM ITS NORMAL POSITION TOWARDS ITS SECOND POSITION, RETARDING MEANS CONNECTED TO THE BUCKET TO RETARD THE LATTER MOVEMENT, SAID RETARDING MEANS BEING ADJUSTABLE TO CORRELATEDLY TIME THE UPWARD MOVEMENT OF THE CUTTING EDGE WITH THE FORWARD MOVEMENT OF THE SCRAPER TO PERMIT THE BUCKET TO LOAD ITSELF BEFORE THE CUTTING EDGE IS LIFTED OUT OF THE GROUND, A HAULBACK CABLE SECURED TO THE AFTER END OF THE SCRAPER TO PULL THE LATTER REARWARDLY, AND BUCKET DUMPING MEANS CONNECTING THE HAULBACK CABLE AND THE AFTER END OF THE BUCKET OPERABLE AS TENSION IS APPLIED TO THE HAULBACK CABLE, TO ELEVATE SAID AFTER END ABOVE THE FORE END TO THEREBY DUMP THE LOAD.