Cutting wheel for rock drilling machine

Claim 1

IN A CUTTER FOR A MACHINE HAVING A ROTARY HEAD WHICH BORES INTO ROCK SO AS TO FORM A TUNNEL THEREIN, SAID HEAD FUNCTIONING TO FORM IN THE ROCK SURFACE BEING BORED A PLURALITY OF CIRCULAR KERFS SO AS TO FRACTURE ROCK BETWEEN A PROXIMATE PAIR OF SAID KERFS IN A MANNER TO CAUSE ROCK FRAGMENTS TO BE SEPARATED FROM THE ROCK BEING BORED, SAID CUTTER ACTING TO FORM A RELATED ONE OF SAID KERFS, (A) A CUTTING WHEEL MOUNTED ON SAID CUTTER FOR ROTARY MOTION SO AS TO BE ABLE TO ROLL ALONG THE KERF BEING CUT, SAID CUTTING WHEEL HAVING A CIRCUMFERENTIAL CUTTING EDGE AND TWO CIRCUMFERENTIAL OUTWARDLY TAPERING SIDES WHICH FORM SAID CUTTING EDGE, SAID CUTTING EDGE WITH SAID OUTWARDLY TAPERING EDGE, SAID CUTTING EDGE WITH SAID OUTWARDLY TAPERING SIDES ACTING TO FORM SAID KERF, THE WHEEL PROVIDING A PLURALITY OF RECESSES IN EACH OF SAID TAPERING SIDES SPACED AT EQUIDISTANT INTERVALS OF THE CIRCUMFERENCE A DISTANCE GREATER THAN THE MAXIMUM WIDTH OF THE RECESSES, EACH OF SAID RECESSES BEING EXPOSED TO THE SIDE FACES AND BEING UNDERCUT ALONG BOTH LATERAL EDGES SO THAT THE RECESSES HAVE A WIDTH IN THE PLANE OF THE SIDE FACE NARROWER THAN THE WIDTH IN A PARALLELING PLANE WHICH IS REMOVED INWARDLY THEREFROM, THE RECESS IN ONE SIDE BEING STAGGERED IN RELATION TO THE RECESSES IN THE OTHER SIDE OF THE WHEEL, (B) A RESPECTIVE TOOTH OCCUPYING EACH OF SAID RECESSES OF SAID CUTTING WHEEL AND BEING RELATIVELY HARD WITH RESPECT TO THE MATERIAL OF SAID CUTTING WHEEL, THE TIP OF EACH TOOTH BEING AT SAID CIRCUMFERENTIAL CUTTING EDGE.