hines

Claim 1

IN A ROTARY TILLING IMPLEMENT WHEREIN A PLURALITY OF DISC-LIKE TILLING ELEMENTS ARE MOUNTED UPON A POSITIVELY DRIVEN ROTARY SHAFT, THE SHAFT BEING ARRANGED AT RIGHT ANGLES TO THE DIRECTION OF IMPLEMENT TRAVEL AND THE TILLING ELEMENTS BEING SPACED ALONG SAID SHAFT TO ROTATE IN PARALLEL PLANES, PARALLEL TO THE DIRECTION OF IMPLEMENT TRAVEL, A PLURALITY OF TILLING ELEMENTS EACH ELEMENT INCLUDING: A TILLING PLATE OF GENERALLY DIC SHAPE, SAID PLATE HAVING AT LEAST SIX SECTORS, EACH SECTOR HAVING: A CENTRAL BODY PORTION EXTENDING OUTWARDLY ALONG THE TWO RADII OF THE SECTOR, SAID BODY PORTION BEING DEFINED BY SAID RADII AND A CHORD SEGMENT OF SAID DISC, SAID CHORD SEGMENT BEING A PART OF A CHORD OF SAID DISC, THE LENGTH OF SAID CHORD BEING APPROXIMATELY EQUAL TO A RADIUS OF SAID DISC WHEN SIX SECTORS ARE USED, SAID CHORD HAVING A LENGTH RELATIVELY LESS THAN THAT OF SAID RADIUS WHEN MORE THAN SIX SECTORS ARE USED, AND A SEGMENT PORTION EXTENDING OUTWARDLY OF THE BODY PORTION TOWARD THE CIRCUMFERENCE OF SAID DISC AND DEFINED BY A PAIR OF STRAIGHT LINES AND SAID CIRCUMFERENCE, ONE OF SAID LINES BEING AN APPROXIMATE EXTENSION OF ONE END OF SAID CHORD SEGMENT TO SAID CIRCUMFERENCE, AND THE OTHER OF SAID LINES JOINING THE OTHER END OF SAID CHORD SEGMENT TO THE CIRCUMFERENCE AND FORMING AN INTERNAL ACUTE ANGLE WITH SAID CHORD SEGMENT, THE EDGE DEFINED BY SAID OTHER OF SAID LINES BEING SHARPENED TO A CUTTING EDGE;