Brake and clutch adjusters

Claim 1

IN AN APPLY MOTOR FOR A FRICTION ENGAGING DEVICE THE COMBINATION OF (A) A SUPPORT STRUCTURE, A FIRST FRICTION MEMBER RIGIDLY SECURED TO SAID SUPPORT STRUCTURE, A SECOND FRICTION MEMBER, A ROTATABLE THIRD FRICTION MEMBER SANDWICHED BETWEEN SAID FIRST AND SECOND FRICTION MEMBERS, SAID SECOND FRICTION MEMBER BEING ADVANCEABLE IN ONE DIRECTION INTO ENGAGEMENT WITH SAID THIRD FRICTION MEMBER SO AS TO URGE SAID THRID FRICTION MEMBER INTO ENGAGEMENT WITH SAID FIRST FRICTION MEMBER WHEREBY RELATIVE ROTATION MAY BE PREVENTED BETWEEN SAID FIRST, SECOND AND THIRD FRICTION MEMBERS, (B) FLUID MOTOR MEANS SUPPORTED BY SAID SUPPORT STRUCTURE INCLUDING A PISTON OPERABLE TO ADVANCE SAID SECOND FRICTION MEMBER INTO ENGAGEMENT WITH SAID THIRD FRICTION MEMBER ND SAID THIRD FRICTION MEMBER INTO ENGAGEMENT WITH SAID FIRST FRICTION MEMBER INTO ENGAGEMENT WITH SAID FIRST FRICTION MEMBER WHEN (C) A SHIFTABLE FRICTION DRAG RING FRICTIONALLY GRIPPED IN SAID MOTOR MEANS AND ABUTTABLE ON ONE SIDE WITH SSAID PISTON TO DETERMINE A RETRACTED POSITION FOR SAID PISTON WHICH PROVIDES A PREDETERMINED RUNNING CLEARANCE BETWEEN SAID THIRD FRICTION MEMBER AND SAID FIRST AND SECOND FRICTION MEMBERS, (D) A SPRING ARRANGED BETWEEN SAID PISTON AND SAID DRAG RING, SAID SPRING BEING PRESTRESSED TO YIELDINGLY HOLD SAID PISTON AGAINST SAID DRAG RING AND IN THE RETRACTED POSITION AND HAVING A COMPRESSIBLE LENGTH SUCH THAT WHEN WEAR OCCURS AT SAID FRICTION MEMBERS SAID PISTON IS EFFECTIVE BY VIRTUE OF SAID SPRING BEING FULLY COMPRESSED AS SAID PISTON TRAVELS A DISTANCE GREATER THAN SAID PREDETERMINED RUNNING CLEARANCE TO ADVANCE SAID DRAG RING TO COMPENSATE FOR SUCH WEAR, (E) AND DEFLECTION COMPENSATING MOTOR MEANS INCLUDING SAID DRAG RING, A MOTOR CHAMBER CONNECTED TO RECEIVE FLUID PRESSURE FROM SAID FLUID MOTOR MEANS AND TO APPLY THE FLUID PRESSURE TO ACT ON ONE SIDE OF SAID DRAG RING IN A DIRECTION OPPOSITE SAID ONE DIRECTION, A VENT CHAMBER EFFECTIVELY CONNECTING THE OTHER SIDE OF SAID DRAG RING TO EXHAUST SO THAT WHEN SAID SUPPORT STRUCTURE IS DEFLECTED AS SAID PISTON IS ADVANCED TO ENGAGE SAID FRICTION MEMBERS THEREBY ADVANCING SAID DRAG RING AND THEREAFTER THE FLUID PRESSURE IS EXHAUSTED FROM SAID FLUID MOTOR MEANS THE DECAY OF FLUID PRESSURE ACTING IN SAID MOTOR CHAMBER IS EFFECTIVE TO MOVE SAID DRAG RING CONFJOINTLY WITH SAID PISTON DURING THE MAJOR PORTION OF DEFLECTION DECAY THEREBY MAINTAINING SAID SPRING FULLY COMPRESSED UNTIL SAID FRICTION MEMBERS APPROACH DISENGAGEMENT WHEREUPON SAID PISTON IS RETURNED TO AN ADVANCED RETRACTED POSITION BY SAID SPRING SO THAT SAID PREDETERMINED RUNNING CLEARANCE IS RESTORED WHEN WEAR AND DEFLECTION OF SAID SUPPORT STRUCTURE OCCURS.