Fluid operated brake

Claim 1

IN COMBINATION WITH A BRAKE BOOSTER HAVING AN EMERGENCY MECHANICAL OPERATOR SECURED TO THE END CAP THEREOF, SAID EMERGENCY OPERATOR COMPRISING A HOUSING CARRIED BY AND PROJECTING AXIALLY FROM SAID END CAP AND DIVIDED TRANSVERSELY THEREOF INTO FIRST AND SECOND CHAMBERS BY A GENERALLY FLAT IMPERFORATE FLEXIBLE DIAPHRAGM, FOLLOWER MEANS HAVING A FLUID-TIGHT SLIDING FIT THROUGH SAID HOUSING FOR OPERATING THE BRAKE BOOSTER AND WITH ITS OPPOSITE END EXTENDING INTO SAID HOUSING NORMALLY BEARING AGAINST THE ADJACENT FACE OF SAID EMERGENCY DIAPHRAGM, POWERFUL COIL SPRING MEANS INCLUDING A BEARING PLATE NESTED TO ONE END THEREOF ENCLOSED BY SAID SECOND CHAMBER WITH SAID BEARING PLATE HELD PRESSED AGAINST THE CENTRAL AREA OF SAID DIAPHRAGM, SOLELY BY SAID SPRING MEANS, THE OTHER END OF SAID SPRING MEANS BEING NESTED TO POSITIONING MEANS THEREFOR CARRIED BY THE INTERIOR END WALL OF SAID SECOND CHAMBER, SAID BEARING PLATE AND THE ADJACENT END OF SAID SPRING BEING FLOATINGLY SUPPORTED WITHIN SAID SECOND CHAMBER OPPOSITE THE CENTRAL AREA OF SAID DIAPHRAGM FREE SLIDING ENGAGEMENT WITH ANY OTHER SURFACE OF SAID BRAKE OPERATING ASSEMBLY DURING COMPRESSION AND EXPANSION OF SAID SPRING THEREBY ALLOWING TILTING OF THE BEARING PLATE A SUBSTANTIAL AMOUNT WITHOUT ANY RISK OF BINDING WHEREBY OPERATION OF THE EMERGENCY OPERATOR IS ASSURED, AND MEANS TO ADMIT PRESSURIZED AIR TO SAID FIRST CHAMBER TO HOLD SAID SPRING NORMALLY COMPRESSED IN SAID SECOND CHAMBER.