Sanding attachments for dump trucks

Claim 1

IN A SANDING ATTACHMENT FOR A VEHICLE, AN ELONGATED HOPPER HAVING FRONT, REAR, AND END WALLS WITH ITS FRONT AND REAR WALLS INCLINED TOWARDS EACH OTHER, A GATE EXTENDING LENGTHWISE OF THE LOWER EDGE OF THE FRONT WALL, HINGE MEANS PROVIDING A PIVOT AXIS AND CONNECTING SAID GATE TO THE LOWER EDGE OF THE FRONT WALL, AN ARM FIXEDLY ATTACHED TO SAID GATE AT THE PIVOT AXIS THEREBY FORMING A PIVOTING PORTION, SAID ARM BEING FAST ON SAID PIVOTING PORTION AND EXTENDING UPWARDLY PART WAY ACROSS THE PROXIMATE END WALL, THE LOWER EDGES OF THE GATE AND THE REAR WALL BEING SPACED APART TO PROVIDE A DISCHARGE SLOT, A ROTOR EXTENDING LENGTHWISE OF AND BELOW SAID SLOT AND INCLUDING A PLURALITY OF CIRCUMFERENTIALLY SPACED RIBS, A SPRING CONNECTED TO SAID ARM AND EXTENDING PART WAY ACROSS SAID PROXIMATE END WALL AND ANCHORED THERETO, SAID SPRING YIELDABLY HOLDING SAID ARM AND SAID GATE IN A FIRST POSITION IN WHICH THE SLOT IS SUBSTANTIALLY CLOSED BY SAID ROTOR AND ITS RIBS BUT PERMITTING SAND TO ESCAPE FROM THE HOPPER AS IT ROTATES, SAID SPRING YIELDING TO PERMIT DISCHARGE OF OBJECTS SO DIMENSIONED THAT THEY WOULD NOT OTHERWISE BE DISCHARGED FROM SAID HOPPER, SUPPORTING STRUCTURE ATTACHED TO AND EXTENDING REARWARDLY OF SAID HOPPER AND INCLUDING A SHAFT PARALLEL TO THE ROTOR AXIS AND PROVIDED WITH AT LEAST ONE GROUND ENGAGING WHEEL, A DRIVE INTERCONNECTING SAID ROTOR AND SAID SHAFT AND INCLUDING A CLUTCH, AND CONNECTING MEANS FOR ATTACHING SAID ATTACHMENT TO SAID VEHICLE.