Lawn mower with orbital motion cutting blade

Claim 1

A MOWER INCLUDING A HOUSING HAVING A TOP WALL AND A DEPENDING, PERIPHERAL SKIRT, A GUARD PLATE SUPPORTED ON SAID SKIRT AND SPACED VERTICALLY BENEATH SAID TOP WALL, GROUND SUPPORT MEANS FOR SUPPORTING SAID HOUSING ON THE GROUND WITH SAID GUARD PLATE SPACED ABOVE THE GROUND IN SUBSTANTIALLY PARALLEL RELATIONSHIP THEREWITH, A PLURALITY OF OPENINGS IN SAID GUARD PLATE FOR RECEIVING STEMS OF GRASS AND OTHER PLANT GROWTH WITHIN SAID HOUSING BETWEEN SAID TOPWALL AND GUARD PLATE, AND A CUTTER IN THE FORM OF A PLATE-LIKE MEMBER SUPPORTED IN SAID HOUSING IN CLOSE, MATING RELATIONSHIP WITH THE UPPER SURFACE OF SIAD GUARD PLATE AND HAVING AN AREA LESS THAN THE AREA OF THE GUARD PLATE, SAID CUTTER BEING SUPPORTED FOR CYCLICAL MOVEMENT ALONG THE UPPER SURFACE OF SAID GUARD PLATE AND BEING MADE UP OF A GRID WORK OF CUTTER BARS OPERABLE DURING SAID CYCLICAL MOVEMENT TO SWEEP ACROSS SAID OPENINGS AND SHEAR THE PLANT MATERIAL PROJECTING THROUGH SAID OPENINGS, SAID CUTTER BARD INTERSECTING EACH OTHER TO DEFINE THE PERIPHERIES OF A PLURALITY OF SUBSTANTIALLY EQUILATERAL TRIANGULAR-SHAPED OPENINGS IN SAID CUTTER OF LARGER AREA THAN THE OPENING IN SAID GUARD PLATE WITH A PORTION OF EACH OF SAID CUTTER BARS FORMING SAID TRIANGULAR OPENINGS SWEEPING ACROSS AT LEAST ONE OF THE GUARD PLATE OPENINGS DURING EACH CYCLE OF MOVEMENT OF THE CUTTER, AND AT LEAST ONE FAN BLADE SUPPORTED IN SAID HOUSING ROTATABLE TO CREATE A SUCTION FORCE THROUGH THE OPENINGS IN SAID GUARD PLATE TENDING TO URGE THE PLANT STEMS TO PROJECT INTO SAID OPENINGS.