Hydraulic devices for reciprocating elements having high inertia

Claim 1

A HYDRALIC DEVICE FOR RECIPROCATING ELEMENTS HAVING HIGH INERTIA COMPRISING: A PRESSURE LIQUID SOURCE; A HYDRAULIC MOTOR HAVING TWO MOTOR CHAMBERS CORRESPONDING TO THE REQUIRED DIRECTION OF MOVEMENT OF THE HIGH INERTIA ELEMENT; A THREE POSITION DISTRIBUTOR DISPOSED BETWEEN THE CHAMBERS AND THE PRESSURE LIQUID SOURCE, THE THREE POSITIONS RESPECTIVELY DIRECTING PRESSURE LIQUID TO THE FIRST MOTOR CHAMBER WHILE CONNECTING THE SECOND CHAMBER TO AN UNPRESSURISED SAPCE, DIRECTING PRESSURE LIQUID TO THE SECOND MOTOR CHAMBER WHILE CONNECTING THE FIRST CHAMBER TO AN UNPRESSURISED SPACE AND ISOLATING BOTH CHAMBERS FROM THE PRESSURE SOURCE; TWO DUCTS CONNECTING RESPECTIVELY THE CHAMBERS TO THE DISTRIBUTOR; A DISCHARGE SPACE; A SINGLE VALVE CONNECTED BETWEEN THE DISCHARGE SPACE AND EACH OF THE DUCTS, SAID SINGLE VALVE COMPRISING A VALVE MEMBER; A CLOSURE MEMBER FOR THE CORRESPONDING DUCT SLIDABLE THEREIN; SAID LAST MENTIONED DUCT INCLUDING A SEAT FOR SAID CLOSURE MEMBER; A PLUNGER FREELY SLIDABLE INSIDE THE CLOSURE MEMBER; AND A PISTON FREELY MOVABLE WITH RESPECT TO BOTH SAID VALVE MEMBER AND SAID PLUNGER AND FITTING SLIDABLY IN SAID VALVE MEMBER TO SEPARATE THEREIN; FIRST AND SECOND CHAMBERS, THE FIRST CHAMBER BEING BOUNDED BY THE CLOSURE MEMBER AND PLUNGER AND COMMUNICATING WITH THE DISCHARGE SPACE AND THE SECOND CHAMBER COMMUNICATING WITH ONE OF SAID DUCTS EXTENDING FROM THE DISTRIBUTOR TO THE HYDRAULIC MOTOR; A SINGLE SPRING IN AID VALVE MEMBER, SAID SPRING BEING LOCATED IN THE FIRST CHAMBER BETWEEN THE CLOSURE MEMBER AND THE PISTON; A COMMUNICATION PASSAGE CONTROLLED BY THE PLUNGER BETWEEN THE CHAMBERS OF THE VALVE MEMBER, THE PLUNGER END OPPOSED TO THAT BOUNDING THE FIRST CHAMBER OF THE VALVE MEMBER BEARING THE PRESSURE IN THE DUCT FROM THE DISTRIBUTOR TO THE CORRESPONDING CHAMBER OF THE HYDRAULIC MOTOR.