Earth scraper with retractable bottom wall

Claim 1

IN AN EARTH-MOVING APPARATUS WHICH INCLUDES A MOBILE, OPEN-FRONT DIRT-CARRYING CONTAINER, A MOVABLE BOTTOM WALL SECTION AT THE FRONT OF SAID CONTAINER, A MOVABLE MOUNTING SAID BOTTOM WALL SECTION FROM SAID CONTAINER FOR RELATIVE MOVEMENT FORWARDLY AND READWARDLY, AND A DIRT-DIGGING SCRAPER BLADE CARRIED BY AND DISPOSED IN ADVANCE OF SAID MOVABLE BOTTOM WALL SECTION THE IMPROVEMENT COMPRISING: AUXILIARY SUPPORT MEANS FOR RESTRAINING DOWNWRD MOVEMENT OF THE FRONT OF SAID WALL SECTION WHEN SAID SECTION IS IN ITS FORWARDMOST POSITION, SAID AUXILIARY SUPPORT MEANS INCLUDING A FIRST MEMBER CARRIED BY THE FORWARD PORTION OF SAID WALL SECTION AND A SECOND MEMBER CARRIED BY SAID CONTAINER AT THE FORWARD END THEREOF IN A POSITION TO BE OUT OF CONTACT WITH SAID FIRST MEMBER WHEN SAID BOTTOM WALL IS IN A REARWARD POSITION AND TO BE ENGAGEABLE WITH AT LEAST THE LOWER SURFACE OF SAID FIRST MEMBER WHEN SAID BOTTOM WALL SECTION IS IN ITS FORWARDMOST POSITION, TO PREVENT DOWNWARD MOVEMENT OF SAID BOTTOM WALL SECTION, SAID FIRST AND SECOND MEMBERS BEING DISPOSED AT THE SIDE OF SAID APPARATUS OUT OF THE LINE OF TRAVEL OF DIRT PASSING OVER SAID SCRAPER BLADE.