Floating cam brake having brake shoe linings of different volumes

Claim 1

IN A VEHICLE BRAKE ASSEMBLY CHARACTERIZED BY A BRAKE DRUM AND A SUPPORT HAVING AT LEAST TWO BRAKE SHOES PIVOTALLY MOUNTED ON SAID SUPPORT ON FIXED AXES AT ONE OF THEIR ENDS, CAM MEANS POSITIONED BETWEEN THE OTHER ENDS OF SAID BRAKE SHOES AND ADAPTED TO BE ACTUATED TO MOVE SAID SHOES TOWARD DRUM ENGAGEMENT, MEANS RIGID WITH SAID SUPPORT FOR MOUNTING AND GUIDING SAID CAM MEANS FOR FLOATING DISPLACEMENT SUBSTANTIALLY IN THE DIRECTION OF MOVEMENT OF SAID OTHER ENDS OF SAID SHOES, RETURN SPRING MEANS FOR MOVING SAID SHOES AWAY FROM SAID DRUM TO AN INACTIVE POSITION, ONE OF SAID SHOES AWAY FROM SAID DRUM TO AN SHOE AND THE OTHER OF SAID SHOES A SECONDARY SHOE, SAID PRIMARY SHOE BEING PROVIDED WITH A BRAKE LINING OF PREDETERMINED THICKNESS INITIALLY LARGER THAN THE THICKNESS OF THE LINING OF SAID SECONDARY SHOE, AND FRICTIONAL ADJUSTING MEANS CONNECTED BETWEEEN SAID SUPPORT AND ONE OF SAID SHOES PROGRESSIVELY EFFECTIVE AS THE LINING WEARS TO ARREST RETURN MOVEMENT OF SAID ONE SHOE CLOSE TO SAID DRUM TO THEREBY AUTOMATICALLY PROVIDE CONSTANT SPACING BETWEEN SAID ONE SHOE AND SAID BRAKE DRUM AS THE LINING ON SAID ONE SHOE WEARS, SAID FLOATING CAM MEANS BEING INITIALLY LOCATED ON THE SIDE OF A GEOMETRIC BRAKE CENTERLINE OPPOSITE TO THE END OF SAID PRIMARY SHOE AND SAID FLOATING CAM MEANS BEING ADAPTED TO MOVE TOWARD SAID PRIMARY SHOE AS BRAKE LINING WEAR PROGRESSES.