Dental engines

Claim 1

IN AN AIR DRIVEN DENTAL TURBINE HAVING A CASING INCLUDING OPPOSED ENDS, A STATOR PLATE AT EACH END OF THE CASING INWARDLY OF SAID OPPOSED ENDS, A SHAFT ROTATABLY MOUNTED IN SAID CASING, AND A ROTOR FIXED TO SAID SHAFT FOR ROTATION BETWEEN SAID STATOR PLATES; THE NOVELTY COMPRISING A ROW OF TURBINE BUCKETS ON THE AXIAL ENDS OF SAID ROTOR ADJACENT THE PERIPHERY OF SAID ROTOR, AND A PLURALITY OF NOZZLES IN SAID STATOR PLATES POSITIONED RADIALLY INWARDLY OF SAID TURBINE BUCKETS AND ARRANGED TO DIRECTED AIR TANGENTIALLY OUTWARDLY SO THAT AIR PASSING THROUGH SAID NOZZLES WILL IMPINGE AN SAID BUCKETS TO ROTATE SAID ROTOR, SAID BUCKETS EXTENDING AXIALLY FROM THE ENDS OF SAID ROTOR, SAID BEING CURVED IN THE RADIAL DIRECTION, THE AXIAL LENGTH OF SAID BUCKETS BEING GREATEST AT THEIR RADIAL INWARD EDGE AND TAPERING IN THEIR AXIAL LENGTH TOWARD THE PERIPHERY OF THE ROTOR, THE STEEPNESS OF THE TAPER BEING SUCH THAT A CIRCULAR SECTION THROUGH THE BLADES AT ANY RADIUS IS OF SUBSTANTIALLY EQUAL AREA TO ANY OTHER SIMILAR SECTION, WHEN SAID ROTOR IS CENTERED AXIALLY BETWEEN SAID STATOR PLATES.