Snow plow attachment for lawn mowers

Claim 1

IN COMBINATION WITH A ROTARY LAWN MOWER CONSISTING OF A WHEELED, GENERALLY HORIZONTAL BASE HAVING A DOWNTURNED SKIRT AROUND ITS EDGES, SAID BASE AND SKIRT DEFINING AN OUTLET TUNNEL EXTENDING LATERALLY TO THE LINE OF TRAVEL OF SAID BASE AT ONE SIDE THEREOF, SAID BASE AND TUNNEL BEING OPEN AT THE BOTTOM, AND A PRIME MOWER MOUNTED ON THE TOP OF SAID BASE AND HAVING A VERTICAL POWER OUTPUT SHAFT EXTENDING DOWNWARDLY THROUGH SAID BASE, A SNOW PLOW ATTACHMENT COMPRISING: (A) A GENERALLY PLANAR, HORIZONTAL PAN AFFIXED TO SAID BASE TO CLOSE THE BOTTOM THEREOF AT THE LEVEL OF THE LOWER EDGE OF SAID SKIRT, WHEREBY TO FORM A CHAMBER BETWEEN SAID BASE AND SAID PAN, SAID PAN HAVING A RESTRICTED APERTURE FORMED THEREIN WHICH IS ELONGATED TRANSVERSELY OF THE BASE, SAID APERTURE EXTENDING SUBSTANTIALLY TO THE SIDE OF THE BASE AT WHICH SAID TUNNEL IS DISPOSED BUT TERMINATING IN SPACED RELATION FROM THE OPPOSITE SIDE OF THE BASE, AND (B) AN IMPELLER BLADE AFFIXED TO SAID SHAFT WITHIN SAID CHAMBER AND OPERABLE TO DRAW AIR AND SNOW INTO SAID CHAMBER THROUGH SAID PAN APERTURE AND TO DISCHARGE THEM FROM SAID CHAMBER THROUGH SAID TUNNEL, SAID IMPELLER BLADE INCLUDING SECTIONS EXTENDING RADIALLY FROM SAID SHAFT AND INCLINED TO THEIR PLANE OF ROTATION, SAID BLADE BEING ROTATED SO AS TO MOVE REARWARDLY AT THE SIDE OF THE BASE AT WHICH SAID TUNNEL IS DISPOSED, AND FORWARDLY AT THE OPPOSITE SIDE OF THE BASE.