Forage chopper

Claim 1

IN COMBINATION WITH A FORAGE CHOPPER CUTTERHEAD HAVING A CENTRAL SHAFT AND KNIVES MOUNTED ON SAID SHAFT, SAID KNIVES HAVING CUTTING EDGES ROTATABLE IN A PREDETERMINED CIRCULAR PATH ABOUT THE AXIS OF SAID SHAFT, A HOUSING HAVING A PAIR OF PLANAR PARALLEL SIDE WALLS BETWEEN WHICH SAID SHAFT EXTENDS, SAID HOUSING HAVING A FORWARD INLET, A REARWARD OUTLET AND A SEPARABLE ARCUATE PERIPHERAL WALL DISPOSED BETWEEN SAID INLET AND OUTLET AND EXTENDING BETWEEN SAID SIDE WALLS, SAID ARCUATE WALL HAVING A POSITION REQUIREMENT OF BEING PARALLEL AND CLOSELY SPACED RELATIVE TO SAID PREDETERMINED CIRCULAR PATH OF ROTATION OF SAID CUTTING EDGES, IMPROVED MEANS FOR MOUNTING SAID ARCUATE WALL ON SAID SIDE WALLS COMPRISING, A PAIR OF ARCUATE GUIDE PLATES, EACH OF SAID GUIDE PLATES HAVING AN ARCUATE OUTER SURFACE WHOSE RADIUS OF CURVATURE EXCEEDS THAT OF THE CIRCULAR PATH OF TRAVEL OF SAID CUTTING EDGES BY A PREDETERMINED AMOUNT CORRESPONDING TO THE REQUIRED POSITION OF SAID ARCUATE WALL, MEANS FIXEDLY MOUNTING SAID GUIDE PLATES RESPECTIVELY ON THE INWARD SIDES OF SAID PARALLEL SIDE WALLS WITH SAID ARCUATE SURFACS CONCENTRIC RELATIVE TO THE AXIS OF SAID CUTTERHEAD SHAFT, AND MEANS INTERENGAGING SAID ARCUATE WALL AND SAID SIDE WALLS AND FORCING SAID ARCUATE WALL RADIALLY INWARDLY AGAINST SAID ARCUATE SURFACES TO CLAMP SAID ARCUATE WALL IN ITS REQUIRED POSITION.