Bin for bulk materials and apparatus for manipulating bins

Claim 1

IN A SHIPPING CONTAINER FOR GRANULAR MATERIALS, A RECTANGULAR BOTTOM WALL PROVIDED ADJACENT ITS CORNERS WITH DEPENDING LEGS, SUBSTANTIALLY RECTANGULAR SIDE WALLS EXTENDING UPWARDLY FROM SAID BOTTOM WALL, A RECTANGULAR TOP WALL SECURED TO THE UPPER ENDS OF SAID SIDE WALLS AND HAVING CORNER LEG SUPPORTING PORTIONS AT THREE OF THE CORNERS THEREOF POSITIONED IN SUBSTANTIAL VERTICAL ALIGNMENT DISCHARGE OPENING IN THE FOURTH CORNER OF SAID TOP AND DISCHARGE OPENING IN THE FOURTH CORNER OF SAID TOP WALL, SAID MEANS COMPRISING A UNITARY TRANSITION MEMBER FORMED OF A RIGID MATERIAL FOR DIRECTING BULK MATERIAL INTO OR OUT OF SAID CONTAINER, SAID MEMBER HAVING AN UPWARDLY DIRECTED TUBULAR PORTION, AN IRREGULARLY SHAPED FLANGE INTEGRAL WITH SAID TUBULAR PORTION AND EXTENDING TRANSVERSELY THEREOF, SAID FLANGE BEING SECURED TO THE UPPER ENDS OF A PAIR OF SAID SIDE WALLS WHICH INTERSECT ADJACENT SAID FOURTH CORNER AND TO SAID TOP WALL SO THAT SAID TUBULAR PORTION IS IN A SUBSTANTIALLY FLUID TIGHT RELATION WITH SAID TOP AND SIDE WALLS, FLOWING DIRECTING MEANS FORMED INTEGRAL WITH SAID TUBULAR PORTION AND SECURED TO SAID PAIR OF SIDE WALLS BELOW SAID FLANGE FOR DIRECTING MATERIAL IN SAID CONTAINER TO SAID TUBULAR PORTION ON TIPPING OF SAID CONTAINER, A COVER FOR THE UPPER END OF SAID TUBULAR PORTION, AND COACTING MEANS ON SAID COVER AND TRANSITION MEMBER RELEASABLY MAINTAINING SAID COVER IN A MOUNTED POSITION ON SAID TUBULAR PORTION.