Hydraulic jack assembly and housing

Claim 1

IN A JACK ASSEMBLY, THE COMBINATION OF A HOUSING INCLUDING A HOUSING BLOCK PROVIDED WITH A PAIR OF VERTICALLY EXTENDING, SPACED AND SUBSTANTIALLY PARALLEL BORE MEANS DEFINING RESPECTIVE COMPARTMENTS, A FLUID PRESSURIZING MEMBER AND A FLUID ACTUATED MEMBER MOUNTED FOR RECIPROCATORY MOVEMENT IN SAID RESPECTIVE COMPARTMENTS, SLEEVE MEANS ARRANGED WITHIN SAID COMPARTMENT OF SAID FLUID ACTUATED MEMBER TO DEFINE AN ANNULAR RESERVOIR COMPARTMENT FOR A FLUID MEDIUM, SAID HOUSING BLOCK HAVING CHANNEL MEANS COMMUNICATING EACH OF SAID COMPARTMENTS WITH ONE ANOTHER, SAID CHANNEL MEANS INCLUDING A PRESSURE AND A SUCTION CHANNEL LYING IN A COMMON SUBSTANTIALLY HORIZONTAL PLANE WITH RESPECT TO AT LEAST THE LOWER END OF SAID COMPARTMENT OF SAID FLUID PRESSURIZING MEMBER, VALVE MEANS DISPOSED IN SAID CHANNEL MEANS, SAID VALVE MEANS COMPRISING A FIRST VALVE COOPERATING WITH SAID SUCTION CHANNEL AND OPENING IN THE DIRECTION OF SAID FLUID PRESSURIZING MEMBER, A SECOND VALVE COOPERATING WITH SAID PRESSURE CHANNEL AND OPENING AWAY FROM SAID FLUID PRESSURIZING MEMBER, AND A RELEASE VALVE COOPERATING WITH SAID PRESSURE CHANNEL AND ADAPTED TO BE OPENED BY SEALING PISTON MEANS, SAID CHANNEL MEANS FURTHER INCLUDING A TRANSVERSELY EXTENDING CHANNEL, SAID TRANSVERSELY EXTENDING CHANNEL BEING PROVIDED WITH DISPLACEABLE SEALING PISTON MEANS MOVABLE IN THE DIRECTION OF SAID PRESSURE CHANNEL FOR OBTURATING ONE END OF SAID SUCTION CHANNEL AND OPENING SAID RELEASE VALVE TO COMMUNICATE SAID PRESSURE CHANNEL WITH SAID ANNULAR RESERVOIR, SAID SEALING PISTON MEANS DURING LIFTING OPERATION OF SAID JACK ASSEMBLY BEING FREE OF SAID ONE END OF SAID SUCTION CHANNEL, AND MEANS OPERATIVELY CONNECTED WITH SAID SEALING PISTON MEANS TO DISPLACE THE LATTER.