Hydro-pneumatic or hydraulic jack devices

Claim 1

A HYDRAULIC JACK FOR A VEHICLE HAVING A FRAME AND WHEELS, SAID JACK COMPRISING A FIRST HOLLOW BODY HAVING A BOTTOM PORTION, AN OPEN UPPER END AND A FIRST CUPSHAPED MEMBER AT SAID OPEN UPPER END AND COMMUNICATING WITH SAID FIRST BODY, AND FIRST CUP-SHAPED MEMBER BEING OPEN AT ITS TOP; A SECOND CUP-SHAPED MEMBER, OPEN AT ITS BOTTOM, ATTACHED TO THE OPEN TOP OF SAID FIRST CUPSHAPED MEMBER; A DEFORMABLE DIAPHRAGM FIXED BETWEEN AND EXTENDING THROUGH SAID FIRST AND SECOND CUP-SHAPED MEMBERS AND PROVIDING THEREWITH TWO SUBSTANTIALLY EQUAL CHAMBERS RESPECTIVELY BELOW AND ABOVE SAID DIAPHRAGM; MEANS ON SAID SECOND CUP-SHAPED MEMBERS FOR ATTACHING THE LATTER AND SAID FIRST BODY TO ONE PART OF THE VEHICLE FRAME AND WHEELS; A SECOND HOLLOW BODY CLOSED AT ITS BOTTOM AND BEING COAXIAL WITH SAID FIRST BODY AND SURROUNDING AND SLIDABLY ENGAGING AT LEAST A PORTION THEREOF; A PISTON SLIDABLY ENGAGING AND BEING MOUNTED COAXIALLY WITHIN SAID FIRST BODY; A PISTON ROD FAST WITH SAID PISTON; A GIIDE BEARING FOR SAID PISTON ROD IN THE BOTTOM PORTION OF SAID FIRST BODY; A RIGID CONNECTION BETWEEN SAID PISTON ROD AND THE BOTTOM END OF SAID SECOND BODY; MEANS FOR CONNECTING SAID PISTON ROD AND WITH IT SAID SECOND BODY TO THAT PART OF THE FRAME AND WHEELS WHICH IS NOT CONNECTED TO SAID FIRST BODY; A FLUID UNDER PRESSURE IN THE UPPER OF SAID TWO CHAMBERS; A FLUID IN SAID FIRST BODY AND IN THE LOWER OF SAID TWO CHAMBERS; A PASSAGEWAY IN SAID PISTON FOR THE PASSAGE OF FLUID THROUGH SAID PISTON FROM ONE FACE THEREOF TO THE OTHER WITHIN SAID FIRST BODY; VALVE MEANS FOR CLOSING AND OPENING SAID PASSAGEWAY; MEANS IN SAID PISTON FOR PERMITTING PASSAGE OF FLUID BETWEEN SAID PISTON AND SAID FIRST BODY FROM ONE FACE OF SAID PISTON TO THE OTHER; A FIRST FLUID PASSAGE EXTENDING THROUGH SAID PLATE BEARING AND LOCATED BETWEEN SAID PISTON ROD AND THE WALL OF SAID FIRST BODY; A SECOND FLUID PASSAGE EXTENDING THROUGH SAID GUIDE BEARING AND BEING LOCATED BETWEEN SAID WALL OF SAID FIRST BODY, AND THE SURROUNDING SAID SECOND BODY; VALVE MEANS FOR OPENING AND CLOSING SAID FIRST AND SECOND FLUID PASSAGES; A DEFORMABLE CONVOLUTE DIAPHRAGM HAVING TWO OPEN ENDS AND BEING CONCENTRIC WITH BOTH SAID FIRST AND SAID SECOND BODIES; A FLUID TIGHT CONNECTION BETWEEN ON OF SAID ENDS OF SAID TUBULAR DIAPHRAGM AND SAID FIRST BODY; AND A FLUID TIGHT CONNECTION BETWEEN THE OTHER OF SAID ENDS OF SAID TUBULAR DIAPHRAGM AND SAID SECOND BODY.