Sliding closure hopper outlet construction

Claim 1

IN COMBINATION, A FOUR-SIDED HOPPER HAVING A DISCHARGE OPENING AND A GENERALLY HORIZONTALLY SLIDABLE CLOSURE FOR THE OPENING, AID HOPPER COMPRISING A FRAME AROUND THE OPENING, SAID FRAME HAVING WALL SECTIONS OVERLYING THE CLOSURE WHEN IN CLOSED POSITION, SAID CLOSURE HAVING UPSTANDING SIDE AND END WALLS BORDERING THREE SIDES OF THE CLOSURE PROVIDING A THREE-SIDED PAN-SHAPED STRUCTURE GENERALLY HORIZONTALLY SLIDABLE TO CLOSED POSITION TO EXTEND IN JUXTAPOSITION TO THE OUTER SURFACES OF THREE OF THE OVERLYING WALLS OF THE FRAME AND EXTEND BENEATH THE LOWER MARGINAL EDGE OF THE FOURTH OVERLYING WALL, MEANS MOUNTING SAID CLOSURE FOR GENERALLY HORIZONTAL SLIDING MOVEMENT WITH ITS TOP SURFACE IN CLOSE PROXIMITY TO THE LOWER MARGINAL EDGE OF THAT WALL OF SAID FRAME THAT IS JUXTAPOSED TO SAID END WALL OF SAID CLOSURE IN CLOSED POSITION THROUGHOUT SUBSTANTIALLY THE ENTIRE RANGE OF MOVEMENT OF SAID CLOSURE BETWEEN CLOSED AND OPEN POSITIONS, SAID CLOSURE WHEN IN CLOSED POSITION SLOPING UPWARDLY AT AN ANGLE FROM THE HORIZONTAL PLANE, SUPPORTING MEANS FOR THE LEADING EDGE OF THE CLOSURE TO SUPPORT IT IN CLOSED POSITION, AND OTHER SUPPORTING MEANS DISPOSED INTERMEDIATE THE ENDS OF THE OPENING AND SPACED BELOW THE LEVEL OF THE CLOSED POSITION OF THE CLOSURE FOR SUPPORTING THE CLOSURE WHEN THE LEADING END IS RELEASED FROM ITS SUPPORT.