Dump truck

Claim 1

A DUMP BODY COMPRISING A RECTANGULAR BED ADAPTED FOR MOUNTING ON A CHASSIS WITH ITS LONGER DIMENSION EXTENDING FRONT TO BACK OF SAID CHASSIS AND ITS SHORTER DIMENSION CENTERED ON SAID CHASSIS, A LOAD-CARRY ING DUMP BUCKET OF GENERALLY SYMMETRICAL CONFIGURATION ABOUT A VERTICAL PLANE EXTENDING LONGITUDINALLY THROUGH ITS CENTER AND ALONG THE LONGER DIMENSION OF SAID BED, OPPOSED UPWARDLY AND DIVERGENTLY EXTENDING SIDES ON SAID BUCKET EXTENDING ANGULARLY WITH RESPECT TO SAID CENTRAL PLANE OF SAID BUCKET, FRONT AND REAR END WALLS ON SAID BUCKET CONNECTED TO SAID SIDES AND PROJECTING UPWARDLY ABOVE SAID SIDES, AT LEAST ONE OF SAID SIDES TERMINATING IN A LIP EXTENDING ESSENTIALLY THE FULL LENGTH THEREOF AND LOCATED SUBSTANTIALLY BELOW THE TOP OF SAID END WALLS, A GATE HINGED TO SAID BUCKET ADJACENT SAID LIP AND EXTENDING THE FULL LENGTH OF SAID LIP AND PROJECTING UPWARD THEREFROM IN THE LOAD-CARRYING POSITION OF SAID BUCKET, MEANS FORMING AN UPWARD EXTENION FROM THE OTHER OF SAID SIDES TO AT LEAST THE TOP OF SAID END WALLS, SAID SIDE AND SAID END WALLS TOGETHER WITH SAID GATE AND SAID EXTENSION FORMING MEANS DEFINING A LOAD-CARRYING ENCLOSURE WHICH HAS A DEPTH ALONG ITS SAID CENTRAL PLANE OF MORE THAN ONE-HALF THE WIDTH OF SAID BUCKET AT ITS GREATEST WIDTH DIMENSION ADJACENT ITS TOP, MOUNTING MEANS FOR SAID BUCKET POSITIONING IT ON SAID BED WITH ITS SAID CENTRAL PLANE CENTERED WITH RESPECT TO SAID BED IN LOAD-CARRYING POSITION, PIVOT MEANS INCLUDED IN SAID MOUNTING MEANS AND ATTACHED TO SAID BUCKET DEFINING A PIVOT AXIS EXTENDING PARALLEL TO AND SPACED ABOVE SAID LIP AND LOCATED SUBSTANTIALLY CLOSER TO SAID LIP THAN TO SAID CENTRAL PLANE OF SAID BUCKET, SAID PIVOT AXIS BEING ABOVE THE CENTER OF GRAVITY OF SAID BUCKET WHEN SAID BUCKET IS IN ITS LOAD-CARRYING POSITION WITH A LOAD THEREIN, POWER DUMPING MEANS ACTING ON SAID BUCKET FOR CAUSING PIVOTAL MOVEMENT THEREOF ABOUT SAID PIVOT AXIS TO CAUSE SAID LIP TO MOVE DOWNWARDLY AND INWARDLY AND TO CAUSE THE CENTER OF GRAVITY OF THE LOADED BUCKET TO REMAIN NEAR TO SAID CENTRAL PLANE UNTIL AFTER THE MATERIAL BEING TO DISCHARGE OVER SAID LIP, AND MEANS FOR OPENING SAID GATE DURING DUMPING MOTION OF SAID BUCKET TO CARRY MATERIAL DICHARGE OVER SAID LIP OUTWARDLY OVER SAID GATE BEYOND THE SIDE OF SAID BED.