Annular hole cutter

Abstract

Abstract 40. AN ANNULAR HOLE CUTTER COMPRISING: (A) A GENERALLY CIRCULAR CYLINDRICAL SIDE WALL HAVING A PLURALITY OF CUTTING TEETH SPACED AROUND THE LOWER END THEREOF AND HAVING MEANS AT THE UPPER END FOR MOUNTING THE CUTTER ON A ROTARY DRIVING MEMBER; (B) EACH TOOTH HAVING AN INNER CUTTING EDGE EXTENDING GENERALLY RADIALLY OUTWARDLY FROM THE INNER PERIPHERY OF SAID SIDE WALL AND AN OUTER CUTTER EDGE EXTENDING RADIALLY INWARDLY FROM THE OUTER PERIPHERY OF SAID SIDE WALL; (C) ALL OF SAID INNER CUTTING EDGES BEING DISPOSED AT SUBSTANTIALLY THE SAME HEIGHT SO AS TO PENETRATE INTO THE MATERIAL BEING CUT TO SUBSTANTIALLY THE SAME DEPTH AND ALL OF SAID OUTER CUTTING EDGES BEING DIDPOSED AT SUBSTANTIAL THE SAME HEIGHT SO AS TO PENETRATE INTO THE MATERIAL BEING CUT TO SUBSTANTIALLY THE SAME DEPTH WHEN THE CUTTER IS ROTATED AND FED AXIALLY INTO THE WORKPIECE, WHEREBY THE CUTTING LOAD IS SUBSTANTIALLY THE SAME ON ALL OF THE INNER CUTTING EDGES AND THE CUTTING LOAD IS SUBSTANTIALLY THE SAME ON ALL OF THE OUTER CUTTING EDGES; (D) THE INNER CUTTING EDGE OF EACH TOOTH BEING STAGGERED CIRCUMFERENTIALLY FORWARDLY IN THE DIRECTION OF ROTATION OF THE CUTTER AT ITS RADIALLY OUTER END RELATIVE TO THE RADIALLY INNER END OF THE OUTER CUTTING EDGE ON EACH TOOTH AND BEING SPACED SUBSTANTIALLY CLOSE TO THE OUTER CUTTING EDGE OF ITS RESPECTIVE TOOTH THAN TO THE OUTER CUTTING EDGE OF THE NEXT SUCCESSIVE TOOTH; (E) THE CIRCUMFERENTIAL SPACE BETWEEN THE CUTTING EDGES OF SUCCESSIVE TEETH COMPRISING RADIALLY UPWARDLY OUTER GULLETS, SAID INNER GULLET EXTENDING UPWARDLY FROM SAID INNER CUTTING EDGE AND HAVING A RADIALLY INNER WALL WHICH TAPERS RADIALLY OUTWARDLY IN AN UPWARD DIRECTIONS, SAID OUTER GULLET EXTENDING UPWARDLY FROM SAID OUTER CUTTING EDTE AND RADIALLY INWARDLY FROM THE OUTER PERIPHERY OF SAID SIDE WALL, SAID INNER GULLET OPENING OUTWARDLY INTO SAID OUTER GULLET, SAID OUTER GULLET HAVING A RADIALLY INNER WALL SPACED RADIALLY OUTWARDLY FROM THE INNER WALL OF SAID INNER GULLET AND EXTENDING UPWARDLY SUBSTANTIALLY BEYOND SAID INNER GULLET AND BEYOND SAID TEETH; (F) THE TRAILING FACE OF THE OUTER GULLET BEING STAGGERED CIRCUMFERENTIALLY REARWARDLY FROM THE TRAILING FACE OF THE INNER GULLET; (G) SAID OUTER GULLET HAVING A RADIAL DIMENSION AND A CIRCUMFERENTIAL DIMENSION AT LEAST AS LARGE AS THE EFFECTIVE LENGTH OF THE INNER CUTTING EDGE SO AS TO ACCOMMODATE THE FLOW OF CLIPS CUT BY THE INNER CUTTING EDGE AND DIRECTED INTO THE OUTER GULLET BY THE RADIALLY INNER WALL OF THE INNER GULLET AND THEREBY DISCHARGE THE CHIPS CUT BY BOTH THE INNER AND OUTER CUTTING EDGES UPWARDLY THROUGH THE PASSAGEWAY DEFINED BY THE OUTER GULLET AND THE OUTER PERIPHERY OF THE GROOVE CUT BY SAID TEETH.

Inventors

No inventors recorded.

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