Elevating scraper

Claim 1

AN EARTH SCRAPING MACHINE COMPRISING: A MOBILE, OPEN-FRONT, OPEN-TOP EARTH CARRYING CONTAINER HAVING LATERALLY SPACED SIDE WALLS; A DOWNWARDLY AND FORWARDLY EXTENDING EARTH SCRAPING BLADE CARRIED AT THE FRONT OF SID CONTAINER BETWEEN SAID SIDE WALLS; AN ELONGATED ENDLESS CONVEYOR BETWEEN SAID SIDE WALLS AT A POSITION ABOVE SAID SCRAPING BLADE, SAID CONVEYOR EXTENDING UPWARDLY AND REARWARDLY AND HAVING AN ELONGATED RIGID FRAME MEANS; MEANS FOR PIVOTALLY MOUNTING SAID CONVEYOR FOR MOVEMENT IN A VERTICAL PLANE, SAID MEANS INCLUDING A FORWARDLY AND UPWARDLY EXTENDING CONVEYOR SUPPORT LINK PIVOTED ABOUT A TRANSVERSE AXIS AT ITS UPPER END TO SAID FRAME MEANS INTERMEDIATE THE ENDS OF SAID FRAME MEANS AND ABOUT ANOTHER TRANSVERSE AXIS AT ITS LOWER END TO ONE OF SAID SIDE WALLS; BIASING MEANS YIELDABLY URGING THE LOWER FORWARD END OF SAID CONVEYOR DOWNWARDLY; AND MEANS FOR GUIDING THE LOWER END OF SAID CONVEYOR FROM A FIRST POSITION ABOVE THE LEVEL OF SAID SCRAPING BLADE ASSUMED WHEN NO DIRT IS PASSING OVER SAID BLADE TO AN INTERMEDIATE POSITION FORWARDLY AND DOWNWARDLY OF SID FIRST POSITION ASSUMED WHEN A MODERATE AMOUNT OF DIRT IS PASSING OVER SAID BLADE AND THEN TO A FINAL POSITION FORWARDLY AND UPWARDLY OF SAID INTERMEDIATE POSITION, SAID GUIDE MEANS INCLUDING A RIGID GUIDE ELEMENT DISPOSED ALONG THE INSIDE OF ONE OF SAID SIDE WALLS ADJACENT DISPOSED ALONG THE INSIDE SAID CONVEYOR AND HAVING A GUIDE SURFACE ENGAGED BY SAID CONVEYOR, SAID GUIDE ELEMENT BEING SUPPORTED BY SAID ONE SIDE WALL; AND MEANS FOR PREVENTING UPWARD MOVEMENT OF THE LOWER END OF SAID CONVEYOR BEYOND A PREDETERMINED POINT.