Piston-type hydraulic damper

Claim 1

A PISTON TYPE HYDRAULIC DAMPER OF THE CHARACTER DESCRIBED COMPRISING: A HOUSING INCLUDING A PAIR OF GENERALLY CUP-SHAPED MEMBERS EACH OF WHICH HAS A CLOSURE HEAD END PORTION AND AN AXIALLY EXTENDING TUBULAR FLANGE, SAID TUBULAR FLANGES BEING OF DIFFERENTIAL DIAMETER AND BEING ASSEMBLED ONE WITHIN THE OTHER WITH THE HEAD END PORTIONS AT OPPOSITE ENDS OF THE ASSEMBLY WHEREBY THE INNER OF SAID FLANGES AND THE HEAD END PORTIONS DEFINE A WORKING CHAMBER; EACH OF SAID END PORTIONS HAVING A BEARING BORE OF SMALLER DIAMETER COAXIALLY ALIGNED AND OPENING FROM SAID WORKING CHAMBER; A PISTON UNIT COMPRISING A PISTON ROD EXTENDING THROUGH SAID CHAMBER AND IN GUIDED BEARING ENGAGEMENT IN SAID BEARING BORES AND HAVING A PISTON FLANGE INTERMEDIATELY THEREON DIVIDING SAID WORKING CHAMBER INTO SUBCHAMBERS, THE PISTON ROD HAVING A HOLLOW INTERIOR CHAMBER AND PASSAGE MEANS ASSOCIATED WITH SAID PISTON FLANGE FOR DISPLACEMENT OF HYDRAULIC DAMPING FLUID BETWEEN SAID INTERIOR AND SAID WORKING CHAMBER ON BOTH SIDES OF SAID FLANGE; VALVE MEANS CONTROLLING SAID DISPLACEMENT IN THE RELATIVE WORKING RECIPROCATIONS OF THE PISTON AND HOUSING: ONE END PORTION OF THE PISTON ROD PROJECTING SUBSTANTIALLY BEYOND THE HEAD END PORTION OF ONE OF SAID MEMBERS AND HAVING MEAND THEREON FOR ATTACHING THE PROJECTING PORTION OF THE PISTON ROD TO ONE TO TWO OPPOSED SPACED RELATIVELY MOVABLE MEMBERS TO BE DAMPED; MEANS ON THE HEAD END PORTION OF THE OTHER OF SAID HOUSING MEMBERS FOR ATTACHING THE DAMPER TO THE MEMBERS TO BE DAMPED; MEANS FOR FILLING AND HOLLOW INTERIOR CHAMBER COMPRISING A FILLER OPENING IN THE END OF SAID PISTON ROD EXPOSED FOR ACCESS OUTSIDE AND HOUSING ADJACENT TO SAID LAST MENTIONED ATTCHING MEANS AND A FILLER PLUG SCREWED THERETO AND ADAPTED TO PLACE HYDRAULIC FLUID FILLED THROUGH THE OPENING INTO SAID HOLLOW INTERIOR CHAMBER UNDER PRESSURE; AND A COMPRESSIBLE PRESSURIZED BODY MOUNTED IN SAID HOLLOW INTERIOR CHAMBER AND ADAPTED TO BE COMPRESSED BY THE PRESSURIZED HYDRAULIC FLUID TO BE COMPRESSED PLENISHING PRESSURE THEREON TO MAINTAIN THE WORKING CHAMBER FILLED THROUGH SAID PASSAGE MEANS.