Differential area wheel cylinder for anti-skid

Claim 1

FORCE MULTIPLYING APPARATUS FOR THE ACTUATION OF VEHICLE BRAKE, SAID VEHICLE BRAKES COMPRISING A PLURALITY OF BRAKES SHOES CARRYING FRICTIONAL ELEMENTS THEREON AND ADAPTED TO BE DRIVEN INTO FRICTIONAL ENGAGEMENT WITH A ROTATABLE DRUM DISPOSED THEREAROUND, SAID FORCE MULTIPLYING APPARATUS COMPRISING: A PRESSURE SOURCE; WHEEL CYLINDER MEANS ADAPTED TO APPLY FORCES IN OPPOSITE DIRECTIONS TO DRIVE THE BRAKE SHOES INTO ENGAGEMENT WITH THE ROTATABLE DRUM; AND MEANS CONNECTING A PRESSURE SOURCE TO THE WHEEL CYLINDER MEANS FOR COMMUNICATING THE PRESSURE CREATED IN THE PRESSURE SOURCE; SAID WHEEL CYLINDER MEANS COMPRISING: A CYLINDER BODY HAVING A BORE THEREIN; FIRST PISTON MEANS DISPOSED IN SAID BORE ADAPTED TO BE DRIVEN INTO ENGAGEMENT WITH A VEHICLE BRAKE SHOE; SECOND PISTON MEANS DISPOSED IN SAID BORE AND BEING IN COMMUNICATION WITH SAID PRESSURE SOURCE; AND THIRD PISTON MEANS SLIDABLY DISPOSED WITHIN SAID SECOND PISTON MEANS AND ADAPTED TO TRANSMIT A FORCE TO ANOTHER BRAKE SHOE OPPOSITELY DISPOSED FROM SAID FIRST-MENTIONED BRAKE SHOE, AND A CHAMBER WHEREIN HYDRAULIC FLUID IS DISPOSED GENERALLY FORMED BY ONE SURFACE OF THE FIRST PISTON MEANS AND THE THIRD PISTON MEANS, SAID CHAMBER BEING PRESSURIZABLE BY THE APPLICATION OF FORCE FROM THE PRESSURE SOURCE TO THE SECOND PRESSURE MEANS WHEREBY THE FIRST PISTON MEANS AND THE THIRD PISTON MEANS ARE DRIVEN IN OPPOSITION TO ONE ANOTHER IN A FORCE MULTIPLYING MANNER THEREBY BRINGING THE BRAKE SHOES INTO FRICTIONAL ENGAGEMENT WITH THE ROTATABLE DRUM WITH A FORCE GREATER THAN PROVIDED TO THE WHEEL CYLINDER BY THE PRESSURE SOURCE.