Master cylinder with in-line compensating valve

Claim 1

A MASTER CYLINDER FOR THE DEVELOPING OF HYDRAULIC PRESSURE FOR A VEHICLE BRAKING SYSTEM, SAID MASTER CYLINDER COMPRISING: A CYLINDER BODY INCLUDING A FIRST AND A SECOND CHAMBER, SAID FIRST CHAMBER BEING A BORE, SAID SECOND CHAMBER BEING A FLUID RESERVOIR; FLUID DISPLACING MEANS SLIDABLY DISPOSED IN THE FIRST CHAMBER AND ADAPTED TO BE TRANSLATIONALLY MOVED THEREIN; CONDUIT MEANS ARRANGED TO PROVIDE A PATH FOR FLUID FLOW FROM THE RESERVOIR TO THE FIRST CHAMBER; AND VALVE MEANS INCLUDING A PILOTING PORTION ADAPTED FOR TRANSLATIONAL MOVEMENT ON A PORTION OF THE CONDUIT MEANS AND BIASED INTO ENGAGEMENT WITH A SEAT ON THE CONDUIT MEANS BY A SPRING; SAID FLUID DISPLACING MEANS BEING BIASED INTO A FIRST EXTREME OF TRANSLATIONAL MOVEMENT BY SPRING MEANS AND BEING ADAPTED TO BE PUSHED BY AN ACTUATOR INTO A SECOND EXTREME OF TRANSLATIONAL MOVEMENT TO DEVELOP PRESSURE IN THE FIRST CHAMBER, MOVEMENT OF THE FLUID DISPLACING MEANS IN A PRESSURE DEVELOPING DIRECTION CAUSING THE VALVE MEANS TO SEAL THE CONDUIT MEANS FROM THE PASSAGE OF FLUID FROM THE FIRST CHAMBER TO THE RESERVOIR, SAID FLUID DISPLACING MEANS BEING RESPONSIVE TO RELEASE OF PRESSURE FROM THE ACTUATOR TO BE MOVED BY THE SPRING MEANS TO SAID FIRST EXTREME OF TRANSLATIONAL MOVEMENT, THE FLUID DISPLACING MEANS DEVELOPING A NEGATIVE PRESSURE IN THE FIRST CHAMBER DURING THE RETURN MOTION THEREBY CAUSING THE VALVE MEANS TO BE UNSEATED FROM THE CONDUIT THEREBY ALLOWING THE FLOW OF FLUID FROM THE RESERVOIR INTO THE FIRST CHAMBER, SAID FLUID DISPLACING MEANS INCLUDING BIASING MEANS AND BEING MOVABLE IN A NON-PRESSURE DEVELOPING DIRECTION PAST A NORMAL POISED POSITION TO DRAW SAID VALVE MEANS FROM ITS SEAT THEREBY EQUALIZING PRESSURE IN SAID FIRST AND SECOND CHAMBER WHEN THE PRESSURE IN SAID FIRST CHAMBER EXCEEDS PRESSURE IN SAID SECOND CHAMBER AND THE EXCESS PRESSURE IS INDUCED BY FLUID EXPANSION IN THE HDYDRAULIC BRAKING SYSTEM.