Hydraulic device

Claim 1

A HYDRAULIC SHOCK ABSORBING UNIT COMPRISING, IN COMBINATION, A CYLINDER HAVING ONE END CLOSED BY AN END WALL, A CYLINDRICAL RAM ASSEMBLY TELESCOPICALLY MOUNTED IN THE OPPOSITE OPEN END OF SAID CYLINDER FOR RELATIVE MOVEMENT THEREIN AND HAVING ITS OUTER END PROVIDED WITH A CLOSURE, A PISTON MOUNTED ON THE INNER END OF SAID RAM ASSEMBLY AND HAVING A CENTRAL CYLINDRICAL OPENING FORMED THEREIN, A GENERALLY CYLINDRICAL METERING PIN HAVING ONE END MOUNTED IN THE CENTER OF SAID END WALL AND PROJECTING INWARDLY OF SAID CYLINDER AND THROUGH SAID CENTRAL OPENING IN SAID PISTON IN A MANNER SUCH THAT THE PROJECTING PORTION OF SAID METERING PIN IS LATERALLY SUPPORTED IN SAID PISTON DURING LONGITUDINAL MOVEMENT OF SAID PISTON RELATIVE THERETO, MEANS ON SAID METERING PIN DEFINING WITH SAID PISTON OPENING ORIFICE MEANS BETWEEN OPPOSITE FACES OF SAID PISTON, MEANS DEFINING AN AXIAL BORE IN SAID PROJECTING END OF SAID METERING PIN, AN ACCUMULATOR PISTON FLOATINGLY MOUNTED IN SAID RAM ASSEMBLY AND BIASED TOWARD SAID PISTON BY A CHARGE OF COMPRESSED GAS IN A GAS CHAMBER DEFINED IN SAID RAM ASSEMBLY BETWEEN SAID ACCUMULATOR PISTON AND SAID RAM ASSEMBLY END CLOSURE, A GUIDE PIN MOUNTED IN THE CENTER OF THE FACE OF SAID ACCUMULATOR PISTON ADJACENT SAID PISTON AND PROJECTING INTO SAID AXIAL BORE FORMED IN SAID METERING PIN TO STABILIZE SAID ACCUMULATOR PISTON AND PREVENT CANTING THEREOF IN SAID RAM ASSEMBLY, THE INNER PORTION OF SAID CYLINDER DEFINED BETWEEN SAID END WALL AND THE OUTER FACE OF SAID PISTON PROVIDING A HIGH PRESSURE HYDRAULIC FLUID CHAMBER AND THE INNER PORTION OF SAID RAM ASSEMBLY DEFINED BETWEEN THE INNER FACE OF SAID PISTON AND THE ADJACENT FACE OF SAID ACCUMULATOR PISTON PROVIDING A LOW PRESSURE HYDRAULIC FLUID CHAMBER, AND PRESSURE REGULATING VALVE MEANS FOR BYPASSING SAID ORIFICE MEANS UPON THE DEVELOPMENT OF A PREDETERMINED HIGH PRESSURE IN SAID HIGH PRESSURE CHAMBER.