Hopper unit for concrete slab laying machines

Claim 1

IN A SLAB LAYING MACHINE WHICH INCLUDES A FORWARDLY MOVABLE ABOVE-GROUND SLAB FORMING PAN, AND MIX-RECEIVING HOPPER DISPOSED IMMEDIATELY AHEAD OF THE PAN AND OPEN TO THE GROUND, THE HOPPER INCLUDING A REAR WALL EXTENDING UPWARDLY FROM THE FRONT END OF THE PAN AND TRANSVERSELY OF THE MACHINE, AND FORWARDLY EXTENDING END WALLS; A TRANSVERSELY EXTENDING UPSTANDING BAFFLE PLATE STRUCTURE IN THE HOPPER EXTENDING BETWEEN THE END WALLS AHEAD OF AND RELATIVELY CLOSE TO BUT SPACED FROM THE REAR WALL, MEANS TO FEED MIX INTO THE HOPPER INSTEAD OF THE BAFFLE PLATE STRUCTURE AND TO A LEVEL ABOVE THE LOWER EDGE THEREOF, SUCH STRUCTURE BEING DISPOSED WITH SAID LOWER EDGE A MATERIAL DISTANCE ABOVE THE PAN, AND MEANS PIVOTALLY MOUNTED THE BAFFLE PLATE STRUCTURE AT ITS UPPER EDGE