Rotary lawnmower

Claim 1

A COMBINED MATERIAL CUTTING AND MULCHING MOWING MACHINE COMPRISING A HOUSING HAVING A SMOOTH, REGULAR SEMITOROIDAL INTERNAL SURFACE, A BLADE, MEANS MOUNTING SAID BLADE FOR ROTATION ABOUT THE MAJOR HOUSING AXIS, AND MEANS FOR ROTATING SAID BLADE, SAID BLADE HAVING FORWARDLY SHARPENED END PORTIONS INCLINING UPWARD IN A DIRECTION CONTRARY TO THE DIRECTION OF BLADE ROTATION, SAID UPWARDLY INCLINING END PORTIONS OF THE BLADE LYING WITHIN THE OUTER PERIPHERAL HALF OF THE INTERNAL SURFACE OF THE HOUSING, THE EFFECTIVE CUTTING LENGTHS OF THE UPWARDLY INCLINING END PORTIONS OF SAID BLADE LYING OUTSIDE THE CIRCULAR PATH OF THE GENERATRIX OF SAID SEMITOROIDAL SURFACE OF THE HOUSING, SAID FORWARDLY SHARPENED UPWARDLY INCLINING END PORTIONS OF THE BLADE CUTTING THE MATERIAL AND IMPARTING BOTH A TANGENTIAL AND AN UPWARD VELOCITY TO THE CUT MATERIAL, SAID HOUSING DEFLECTING THE CUT MATERIAL AROUND ITS INTERNAL SURFACE, SAID BLADE HAVING INTERMEDIATE PORTIONS LYING AT LEAST PARTLY WITHIN THE INNER PERIPHERAL HALF OF SAID INTERNAL SURFACE OF THE HOUSING, SAID INTERMEDIATE PORTIONS OF THE BLADE INCLINING DOWNWARD IN A DIRECTION CONTRARY TO THAT OF BLADE ROTATION FOR DRAWING CUT MATERIAL DOWNWARD FROM THE INNER PORTION OF SAID INTERNAL SURFACE OF SAID HOUSING AND INTO THE PATH OF THE INTERMEDIATE BLADE PORTIONS, SAID INTERMEDIATE BLADE PORTIONS BEING FORWARDLY SHARPENED FOR FURTHER CUTTING THE CUT MATERIAL AND MULCHING THE TERRAIN.