Bottom discharge bin

Claim 1

A BIN FOR TRANSPORTING AND STORING BULK FLOWABLE MATERIAL, SAID BIN COMPRISING AN UPRIGHT HOLLOW BODY HAVING SIDE WALLS, A SUBSTANTIALY RECTANGULAR FLOOR AND DEPENDING LEGS DISPOSED SUBSTANTIALLY AT THE CORNERS OF SAID FLOOR, SAID FLOOR HAVING A CENTRAL OPENING OF SUBSTANTIALLY RECTANGULAR SHAPE, A BOTTOM WALL SECTION OF SUBSTANTIALLY INVERTED V-SHAPE DISPOSED ABOVE SAID OPENING, A PAIR OF HORIZONTALLY SPACED BIN DISCHARGE OPENINGS IN SAID BOTTOM WALL SECTION AT THE LOWER END THEREOF EXTENDING SUBSTANTIALLY THE FULL LENGTH OF SAID SECTION IN A HORIZONTAL DIRECTION, A PAIR OF DOOR MEMBERS HINGED AT THEIR UPPER ENDS OF SAID WALL SECTION ABOVE SAID DISCHARGE OPENINGS FOR MOVEMENT BETWEEN POSITIONS OPENING AND CLOSING SAID DISCHARGE OPENINGS, EACH DOOR MEMBER IN THE CLOSED POSITION THEREOF BEING POSITIONED SO THAT THE WEIGHT OF BULK MATERIAL IN SAID BIN URGES SAID DOOR MEMBER TOWARD ITS OPEN POSITION, MEANS ON SAID BIN ATTACHED TO SAID DOOR MEMBERS OF MOVING SAID DOOR MEMBERS TO SAID CLOSED POSITIONS AND ALLOWING SAID DOOR MEMBERS TO MOVE TO OPEN POSITIONS IN WHICH THEY EXTEND DOWNWARDLY ABOVE THE LOWER ENDS OF SAID LEGS AT POSITIONS TOTALLY WITHIN THE AREA BOUNDED BY VERTICAL PLANES EXTENDING DOWNWARDLY FROM THE UPPER ENDS OF THE BIN DISCHARGE OPENINGS, AND INCLINED INTERNAL WALLS IN SAID BIN ON TRANSVERSELY OPPOSITE SIDES OF SAID BOTTOM WALL SECTION FOR DIRECTING MATERIAL IN SAID BIN TOWARD SAID DISCHARGE OPENINGS.