Shock absorber base valve

Claim 1

IN A SHOCK ABSORBER HAVING A COMPRESSION CHAMBER AND A RESERVOIR, BASE VALVE MEANS PARTITIONING SAID COMPRESSION CHAMBER FROM SAID RESERVOIR, SAID BASE VALVE MEANS INCLUDING A BODY HAVING A PORT THERETHROUGH LEADING TO SAID RESERVOIR, THE SURFACE OF SAID BODY ON THE COMPRESSION CHAMBER SIDE THEREOF HAVING AN INNER VALVE SEAT ADJACENT SAID PORT AND AN OUTER ALVE SEAT REMOTE FROM SAID PORT, INNER AND OUTER ORIFICES RECESSED INTO SAID INNER AND OUTER SEATS RESPECTIVELY, A PRESSURE CHAMBER RECESSED INTO SAID SURFACE BETWEEN SAID SEATS, SAID BASE VALVE MEANS INCLUDING SHIFTABLE VALVE PLATE MEANS ADAPTED TO SEAT AT SAID INNER AND OUTER SEATS AND COVER SAID INNER AND OUTER ORIFICES AND PRESSURE CHAMBER, SAID OUTER VALVE SEAT AND PLATE MEANS SEATED THEREAT COOPERATING TO SEPARATE SAID COMPRESSION CHAMBER FROM SAID PRESSURE CHAMBER, SAID INNER VALVE SEAT AND PLATE MEANS SEATED THEREAT COOPERATING TO SEPARATE SAID PRESSURE CHAMBER FROM SAID PORT, SAID COMPRESSION CHAMBER AND PORT BEING IN UNRESTRICTED COMMUNICATION WHEN SAID PLATE MEANS IS UNSEATED FROM SAID SEATS, SAID VALVE PLATE MEANS BEING RESPONSIVE TO THE PRESSURE DIFFERENTIAL BETWEEN SAID COMPRESSION CHAMBER AND PORT TO BE UNSEATED FROM SAID VALVE SEATES WHEN THE PRESSURE IN SAID COMPRESSION CHAMBER FALLS TO A PREDETERMINED VALUE BELOW THE PRESSURE IN SAID PORT, AND TO BE URGED TOWARD SAID SEATS TO SEAT THEREAT BY A FORCE PROPORTIONAL TO SAID PRESSURE DIFFERENTIAL WHEN THE PRESSURE IN SAID COMPRESSION CHAMBER RISES TO A PREDETERMINED VALUE ABOVE THE PRESSURE IN SAID PORT, THE INNER ORIFICE IN SAID INNER VALVE SEAT BEING OF RESTRICTED CROSS SECTIONAL AREA AND CONNECTING SAID PRESSURE CHAMBER AND PORT, THE OUTER ORIFICE IN SAID OUTER VALVE SEAT CONNECTING SAID COMPRESSION CHAMBER AND PRESSURE CHAMBER AND BEING COMPARATIVELY NONRESTRICTIVE TO FLUID FLOW WITH RESPECT TO SAID RESTRICTED PASSAGE SO AS TO COMMUNICATE THE PRESSURE OF SAID COMPRESSION CHAMBER TO SAID PRESSURE CHAMBER, THE PORTION OF SAID VALVE PLATE MEANS COVERING SAID INNER ORIFICE COMPRISING A FLAT LEAF SPRING COOPERATING WITH SAID INNER ORIFICE TO PROVIDE A RESTRICTED PASSAGE FOR FLUID FROM SAID PRESSURE CHAMBER TO SAID PORT, SAID LEAF SPRING BEING YIELDABLE FROM SAID INNER VALVE SEAT IN RESPONSE TO A PREDETERMINED PRESSURE IN SAID PRESSURE CHAMBER TO OPEN THE COMMUNICATION BETWEEN SAID PRESSURE CHAMBER AND PORT.