Vehicle brake device

Claim 1

IN A BRAKE DEVICE FOR A VEHICLE WHEEL HAVING A BACKING PLATE AND BRAKE SHOES AND A WHEEL CYLINDER FOR EXPANDING SAID SHOES AND PROVIDED WITH A SOURCE OF HYDRAULIC FLUID, AND A CONTROL DEVICE CARRIED BY THE BACKING PLATE AND COMPRISING PASSAGE MEANS BETWEEN SAID SOURCE AND SAID WHEEL CYLINDER AND COMPRISING A FIRST CHAMBER COMMUNICATING WITH SAID SOURCE AND A SECOND CHAMBER COMMUNICATING WITH SAID WHEEL CYLINDER AND PROVIDED WITH A PORT THEREBETWEEN, AN AXIALLY MOVABLE MEMBER IN SAID FIRST CHAMBER PROVIDED, WITH A VALVE MOVABLE TO CLOSE SAID PORT, SAID VALVE BEING NORMALLY OPEN TO PROVIDE NORMAL COMMUNICATION THROUGH SAID PASSAGE MEANS, MEANS RESPONSIVE TO A PREDETERMINED BRAKE TORQUE FOR CLOSING SAID VALVE, SUCH MEANS COMPRISING A ROCKING MEMBER CONNECTED WITH THE BRAKE SHOES AND ENGAGING SAID AXIALLY MOVABLE MEMBER, SAID ROCKING MEMBER HAVING A NORMAL POSITION WHEN SAID BRAKE SHOES ARE RELEASED, AND FROM WHICH POSITION IT IS MOVABLE BY BRAKE TORQUE TO CLOSE SAID VALVE, AND A SPRING BIASING SAID AXIALLY MOVABLE MEMBER TO NORMAL POSITION TO PREDETERMINE THE BRAKE TORQUE AT WHICH SAID ROCKING MEMBER WILL CLOSE SAID VALVE, AND MEANS RESPONSIVE TO PRESSURE IN SAID SOURCE, IF SAID VALVE IS CLOSED, FOR REDUCING THE VOLUME OF SAID SECOND CHAMBER TO DISPLACE FLUID THEREFROM TO SAID WHEEL CYLINDER AT A RATE LOWER THAN THE NORMAL RATE OF FLOW OF FLUID THROUGH SAID PASSAGE MEANS.