Air driven variable speed turbine for angular and straight handpieces

Claim 1

A DENTAL HANDPIECE, COMPRISING A HOUSING, A TURBINE SHAFT ROTATABLY MOUNTED WITHIN SAID HOUSING, SAID HOUSING PROVIDING A TURBINE CHAMBER, IMPELLER MEANS MOUNTED UPON SAID SHAFT WITHIN SAID CHAMBER FOR ROTATING SAID SHAFT WHEN FLUID UNDER PRESSURE IS DIRECTED THEREAGAINST, A STATOR FOR DIRECTING FLUID UNDER PRESSURE TOWARD SAID IMPELLER MEANS, MOVABLE FLUID FLOW RESTRICTOR MEANS, DISPOSED WITHIN SAID HOUSING BETWEEN SAID STATOR AND SAID IMPELLER, SAID FLUID FLOW RESTRICTER MEANS BEING MOVABLE BETWEEN A FIRST POSITION AND A SECOND POSITION LEVER MEANS PIVOTALLY MOUNTED UPON SAID SHAFT FOR PIVOTAL RADIAL MOVEMENT UNDER THE INFLUENCE OF CENTRIFUGAL FORCE WHEN SAID SHAFT IS ROTATED, CLUTCH MEANS INTERPOSED BETWEEN SAID LEVER MEANS AND SAID FLUID FLOW RESTRICTER MEANS FOR URGING SAID FLUID FLOW RESTRICTER MEANS FROM SAID FIRST POSITION TOWARD SAID SECOND POSITION WHEN SAID LEVER MEANS IS PIVOTED OUTWARDLY UNDER THE INFLUENCE OF CENTRIFUGAL FORCE, AND COUNTER-BALANCING MEANS CARRIED BY SAID SHAFT AND ENGAGING SAID LEVER MEANS, SAID COUNTER-BALANCING MEANS BEING SHIFTABLE AXIALLY TO OFFSET THE EFFECT OF CENTRIFUGAL FORCE ON SAID LEVER MEANS, AND ADJUSTING MEANS PROVIDED BY SAID HOUSING FOR MANUALLY SHIFTING SAID COUNTER-BALANCING MEANS INTO ANY OF A VARIETY OF SELECTED POSITIONS.