Servo motor

Claim 1

IN A SERVO MOTOR FOR MOVING RELATIVELY ROTATABLE FRICTION MEMBERS INTO AND OUT OF FULL FRICTIONAL ENGAGEMENT, A HOUSING HAVING A CAVITY THEREIN, A PISTON ASSEMBLY MOVABLY MOUNTED IN SAID CAVITY TO DEFINE AT LEAST ONE FLUID WORKING CHAMBER, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID WORKING CHAMBER, SAID PISTON ASSEMBLLY INCLUDING PRIMARY AND SECONDARY PISTONS, AN APPLY MEMBER OPERATIVELY CONNECTED TO ONE OF THE FRICTION MEMBERS, FIRST RESILIENT MEANS IN SAID CAVITY FOR URGING SAID PISTON MEMBER TO A PREDETERMINED POSITION IN SAID WORKING CHAMBER, SECOND RESILIENT MEANS MECHANICALLY CONNECTING SAID PRIMARY PISTON AND SAID APPLY MEMBER FOR TRANSMISSION OF PRIMARY PISTON APPLY FORCE TO SAID APPLY MEMBER TO INITIALLY MOVE SAID APPLY MEMBER AND TAKE UP CLEARANCE BETWEEN THE FRICTION MEMBERS AND FOR SUBSEQUENT DEFLECTION TO INCREASE THE VOLUME OF SAID WORKING CHAMBER AND REDUCE THE RATE THAT FORCE IS APPLIED TO THE FRICTION MEMBERS BY SAID PRIMARY PISTON, MEANS FOR TRANSMITTING PRIMARY PISTON APPLY FORCE TO SAID SECONDARY PISTON OPPOSING THE FORCE OF SAID FIRST RESILIENT MEANS TO PERMIT SAID SECONDARY PISTON TO MOVE IN SAID CAVITY TO FURTHER INCREASE THE VOLUME OF SAID FLUID WORKING CHAMBER SO THAT THE RATE THAT FORCE IS APPLIED BY THE PRIMARY PISTON WILL BE FURTHER REDUCED TO CALIBRATE THE ENGAGEMENT OF SAID FRICTION MEMBERS.