Hydraulic locking device

Claim 1

IN A HYDRAULIC LOCKING DEVICE OF THE CHARACTER DESCRIBED RELATIVE TO EACH OTHER, THE COMBINATION OF: SPACING RELATIVE TO EACH OTHER, THE COMBINATION OF: A FIRST STRUCTURE IN THE FORM OF A SINGLE CYLINDER HAVING AN OUTER CLOSED END FOR CONNECTION TO ONE OF SAID TWO MEMBERS AND HAVING AN INNER OPEN END; A SECOND STRUCTURE FOR CONNECTION TO THE OTHER OF SAID TWO MEMBERS, SAID SECOND STRUCTURE INCLUDING AN OUTER CYLINDER AND AN INNER CYLINDER FIXEDLY CONNECTED THERETO, SAID OUTER CYLINDER TELESCOPING OVER SAID SINGLE CYLINDER AND SAID INNER CYLINDER SLIDINGLY TELESCOPING INTO THE SINGLE CYLINDER WITH THE SINGLE CYLINDER AND THE INNER CYLINDER FORMING A VARIABLE HYDRAULIC CHAMBER, SAID SINGLE CYLINDER AND SAID OUTER AND INNER CYLINDERS FORMING TWO ANNULAR COMPARTMENTS INTERCONNECTED THROUGH THE WALL OF THE SINGLE CYLINDER, SAID TWO COMPARTMENTS TOGETHER FUNCTIONING AS A SECOND VARIABLE HYDRAULIC CHAMBER OF SUBSTANTIALLY THE SAME CROSS-SECTIONAL AREA AS THE FIRST HYDRAULIC CHAMBER; A HYDRAULIC RESERVOIR INSIDE SAID INNER CYLINDER; A PASSAGE MEANS IN SAID INNER CYLINDER FOR COMMUNICATION BETWEEN THE TWO HYDRAULIC CHAMBERS AND FOR COMMUNICATION BETWEEN THE RESERVOIR AND THE TWO CHAMBERS; A LOCKING VALVE IN SAID PASSAGE MEANS NORMALLY CLOSED TO CUT OFF COMMUNICATION BETWEEN THE TWO HYDRAULIC CHAMBERS; AND CONTROL MEANS TO OPEN SAID LOCKING VALVE TO PERMIT FLUID FLOW BETWEEN THE TWO CHAMBERS FOR CHANGE IN THE SPACING OF THE TWO MEMBERS.