Gravity grain box

Claim 1

A GRAVITY EMPTIED BOX INCLUDING A HOPPER FOR FLUENT MATERIAL, A FRAMEWORK CONNECTED WITH THE HOPPER AND ADAPTED TO BE SUPPORTED ON THE BED OF A TRUCK, SAID HOPPER HAVING SIDE WALLS, A FRONT AND A BACK WALL, SAID BACK WALL HAVING A DISCHARGE OPENING, A BOTTOM CONNECTED TO THE SIDE WALLS, FRONT WALL AND BACK WALL OF SAID HOPPER AND SLOPING DOWNWARDLY TOWARD SAID BACK WALL, A DOOR, A VERTICAL TRACK CONNECTED WITH SAID BACK WALL AND VERTICALLY SLIDABLY SUPPORTING THE DOOR, MEANS INCLUDING A LEVER MOUNTED FOR VERTICAL SWINGING MOVEMENT ON THE BACK WALL OVER THE OPENING AND OPERATIVELY CONNECTED TO THE DOOR FOR ELEVATING SAID DOOR, A VERTICALLY SWINGABLE CHUTE PIVOTALLY CONNECTED WITH SAID HOPPER AND HAVING A BOTTOM WHICH FORMS A SUBSTANTIAL CONTINUATION OF SAID SLOPING BOTTOM OF SAID HOPPER WHEN SAID CHUTE IS IN A LOWERED OPERATIVE POSITION, SAID LEVER BEING MOVABLE TO A LOWERED POSITION AND ENGAGING THE CHUTE WHEN SAID CHUTE IS IN A RAISED INOPERATIVE POSITION AND THE DOOR IS IN A LOWERED OPERATIVE POSITION FOR POSITIVELY HOLDING SAID CHUTE IN SAID RAISED INOPERATIVE POSITION.