Zero travel vacuum suspended brake booster

Claim 1

A BRAKE BOOSTER COMPRISING: A HOUSING CARRIED BY A FIXED PORTION OF A VEHICLE; A VACUUM INLET TO SAID HOUSING FROM A VACUUM PRESSURE SOURCE; AN INLET INTO SAID HOUSING FOR COMMUNICATING ATMOSPHERIC PRESSURE THEREINTO; POWER PISTON MEANS MOVABLY SUPPORTED BY SAID HOUSING AND ADAPTED TO TRANSFER AN OUTPUT FORCE TO A BRAKE MASTER CYLINDER; VALVE MEANS SLIDABLY DISPOSED IN SAID HOUSING AND ARRANGED TO SELECTIVELY ROUTE VACUUM AND ATMOSPHERIC PRESSURES TO PORTIONS OF SAID HOUSING IN RESPONSE TO AN INPUT FORCE, SAID VALVE MEANS ACTING AS A PILOT FOR SAID POWER PISTON MEANS DURING MOVEMENT THEREOF; AND A PLURALITY OF DIAPHRAGMS PERIPHERALLY CARRIED BY SAID HOUSING AND BEING CENTRALLY CARRIED BY SAID POWER PISTON MEANS, THEREBY SEPARATING SAID HOUSING INTO SEVERAL COMPARTMENTS INDIVIDUALLY PRESSURIZABLE, AT LEAST ONE OF SAID DIAPHRAGMS BEING RESPONSIVE TO ATMOSPHERIC PRESSURE AND INCLUDING MEANS FOR IMPARTING A FORCE ON SAID VALVE MEANS THEREBY EFFECTIVELY INCREASING THE INPUT FORCE NECESSARY TO OBTAIN A GIVEN OUTPUT FORCE AT THE BRAKE MASTER CYLINDER, SAID LAST NAMED MEANS INCLUDES A PIN SLIDABLY CARRIED BY SAID POWER PISTON MEANS AND RESPONSIVE TO MOVEMENT OF ONE OF SAID DIAPHRAGMS TO IMPOSE A FORCE ON SAID VALVE MEANS DURING AN ACTUATING MOVEMENT THEREOF WHICH IS TRANSMITTED AS A RESISTANCE TO THE ACTUATING FORCE ACTING ON SAID VALVE MEANS, SAID PIN HAS A PLURALITY OF PERIPHERALLY DISPOSED RESILIENT BUMPERS SERVING TO RETAIN SAID PIN IN SAID POWER PISTON MEANS AND AS A SHOCK ABSORBER WHEN CONTACTED BY SAID DIAPHRAGM DURING MOVEMENT THEREOF IN RESPONSE TO A PRESSURE INCREASE.