Percussive drill bits

Claim 1

IN A PERCUSSIVE DRILL BIT HAVING A WORKING SURFACE OF WINGED SHAPE AND DIVIDED NOTIONALLY INTO INNER, CENTRAL AND OUTER CONCENTRIC CUTTING REGIONS, SAID SURFACE HAVING RADIAL RECESSES THEREIN, A PLURALITY OF RADIAL INSERTS DISPOSED WITHIN SAID RECESSES AND EACH INSERT HAVING A CUTTING EDGE DISPOSED RADIALLY AND EXPOSED FROM SAID WORKING SURFACE, SAID INSERTS CONSTITUTING A FIRST LINE EXTENDING ACROSS THE WIDTH OF SAID OUTER REGION IN EACH WING, A SECOND LINE CONSTITUTED BY TWO SUCH INSERTS EXTENDING ACROSS THE WIDTH OF SAID OUTER REGION AND THE WIDTH OF SAID CENTRAL REGION IN EACH WING AND HAVING A GAP BETWEEN SAID INSERTS, WHICH GAP IS LOCATED AT THE BORDER OF SAID OUTER AND CENTRAL REGIONS AND A THIRD LINE CONSTITUTED BY THREE SUCH INSERTS EXTENDING ACROSS THE WIDTH OF SAID OUTER, CENTRAL AND INNER REGIONS IN EACH WING AND HAVING A GAP BETWEEN EACH SAID INSERT, ONE SAID GAP BEING LOCATED AT THE BORDER OF SAID OUTER AND CENTRAL REGIONS AND THE OTHER SAID GAP BEING LOCATED AT THE BORDER OF SAID CENTRAL AND INNER REGIONS.