Hydraulic cushion device for railway cars

Claim 1

IN A HYDRAULIC CUSHION UNIT COMPRISING A CYLINDER HAVING A BORE, A FIRST BASE PLATE FIXED TO ONE END OF SAID CYLINDER, A PISTON HEAD RECIPROCABLE WITHIN THE BORE OF SAID CYLINDER AND HAVING AN AXIAL ORIFICE, SAID PISTON HEAD DEFINING A HIGH PRESSURE CHAMBER ON ONE SIDE THEREOF WITH SAID FIRST BASE PLATE AND A LOW PRESSURE CHAMBER ON THE OPPOSITE SIDE THEREOF, A TUBULAR PISTON ROD FIXED AT ONE END TO SAID PISTON HEAD WITH THE OTHERE END EXTENDING THROUGH THE OPEN END OF SAID CYLINDER, SAID TUBULAR PISTON ROD HAVING A BORE COAXIALLY DISPOSED RELATIVE TO SAID AXIAL ORIFICE, A SECOND BASE PLATE FIXED TO SAID OTHER END OF SAID PISTON ROD, A FLEXIBLE BOOT RESERVOIR HAVING BEADS AT EACH END THEREOF, SAID FLEXIBLE BOOT RESERVOIR HAVING A REVERSELY TURNED END PORTION WHICH IS TURNED INWARDLY INTO SAID BOOT, AN INTERMEDIATE CYLINDER HEAD HAVING AN ORIFICE, SAID INTERMEDIATE CYLINDER HEAD BEING FIXED TO SAID CYLINDER AND INCLUDING AN ORIFICE AND AN ANNULAR CLAMPING MEANS FOR HOLDING ONE OF SAID BEADED ENDS OF SAID FLEXIBLE BOOT RESERVOIR CLAMPED TO SAID INTERMEDIATE CYLINDER HEAD A FIRST CLAMPING RING FIXED ON SAID PISTON ROD, A SECOND CLAMPING RING SLIDABLE ON SAID PISTON ROD TO COACT WITH SAID FIRST CLAMPING RING FOR CLAMPING SAID BEADED END ON SAID REVERSELY TURNED END PORTION ON SAID PISTON ROD, ONE OF SAID FIRST AND SECOND CLAMPING RINGS HAVING AN INCLINED PERIPHERAL SURFACE UNDERLYING SAID REVERSELY TURNED END, RETAINING MEANS ON SAID PISTON ROD FOR RETAINING SAID SECOND CLAMPING MEANS IN CLAMPING RELATIONSHIP WITH SAID FIRST CLAMPING RING, AND HYDRAUILC FLUID FILLING SAID CYLINDER, SAID PISTON HEAD AND SAID CYLINDER BEING MOVABLE RELATIVELY TO EACH OTHER FROM AN EXTENDED NEUTRAL POSITION TO A CONTRACTED POSITION UPON IMPACT AT SAID BASE PLATES AND THEREBY TO DISPLACE FLUID FROM SAID HIGH PRESSURE CHAMBER INTO SAID LOW PRESSURE CHAMBER AND SAID FLEXIBLE BOOT RESERVOIR.