Fluid driven motor unit for a dental apparatus

Claim 1

A DRIVE UNIT TO WHICH A DENTAL HANDPIECE MAY BE REMOVABLY CONNECTED, SAID UNIT COMPRISING: A HOUSING, A FLUID OPERATED MOTOR HAVING A FIXED ANGLE SWASH PLATE, SAID MOTOR BEING MOUNTED WITHIN SAID HOUSING, A GASEOUS FLUID SUPPLY SOURCE CONNECTED TO SAID MOTOR WHICH DELIVERS TO SAID MOTOR ON DEMAND A SUPPLY OF SAID FLUID, SAID WASH PLATE HAVING A PLURALITY OF PISTONS OPERATIVELY ACTING UPON ITS OUTER PERIPHERAL SURFACE, SAID PISTONS BEING LONGITUDINALLY DISPOSED WITHIN SAID MOTOR AND HAVING AN AXIAL PROJECTION FROM ONE END THEREOF, PROVIDING A FRICTIONAL CONTACT BETWEEN SAID AXIAL PROJECTION AND SAID SWASH PLATE, A DRIVE SHAFT CONNECTED TO A HUB MEMBER, A SAID HUB MEMBER BEING AN INTEGRAL PART OF SAID SWASH PLATE AND OPERATIVELY CONNECTED THERETO BY BEARING MEMBERS, THEREBY ALLOWING SAID SHAFT TO ROTATE WHEN SAID PISTONS ARE LINEARLY MOVED BY THE GASEOUS FLUID, AND A STATIONARY LOCATING SLEEVE DISPOSED ABOUT SAID DRIVE SHAFT, MEANS FOR SECURING SAID LOCATING SLEEVE AT ONE END TO SAID HOUSING, AND RESILIENT LOCKING MEANS MOUNTED ON SAID LOCATING SLEEVE, WHEREBY A DENTAL HANDPIECE MAY BE DRIVINGLY CONNECTED TO SAID DRIVE UNIT.