Hydraulically-operated reciprocating apparatus

Claim 1

HYDRAULICALLY OPERATED RECIPRICATING APPARATUS COM PRISING A MAIN WORKING PISTON AND CYLINDER ASSEMBLY INCLUDING A MAIN WORKING CYLINDER AND A MAIN WORKING PISTON HAVINGA PART OF LARGER DIAMETER DISPOSED FOR RECIPROCATION WITHIN THE MAIN WORKING CYLINDER AND COOPERATING THEREWITH TO FORM A FIRST WORKING CHAMBER FOR LARGER CROSS-SECTIONAL AREA, A SUBSIDIARY WORKING PISTON AND CYLINDER ASSEMBLY COMPRISING A SUBSIDIARY WORKING PISTON AND A SUBSIDIARY WORKING CYLINDER ARRANGED FOR RECIPROCATION RELATIVELY TO ONE ANOTHER, ONE OF SUCH RELATIVELY MOVING PARTS BEING RIGID WITH THE MAIN WORKING PISTON WHILE THE OTHER IS RIGID WITH THE MAIN WORKING CYLINDER, THE SUBSIDIARY WORKING CYLINDER OPENING INTO THE END OF THE MAIN WORKING CYLINDER REMOTE FROM THE SAID WORKING CHAMBER OF LARGER CROSS-SECTIONAL AREA AND BEING OF SMALLER CROSS-SECTION AREA THAN SAID WORKING CHAMBER OF LARGER CROSS-SECTIONAL AREA, FLUID PRESSURE SUPPLY MEANS, PASSAGE MEANS CONNECTING SAID FLUID PRESSURE SUPSUPPLY MEANS CONTINUOUSLY TO SAID WORKING CHAMBER OF SMALLER CROSS-SECTIONAL AREA, A HYDRAULIC ACCUMULATOR HAVING ITS LIQUID PRESSURE CHAMBER CONNECTED TO SAID PASSAGE MEANS, A NON-RETURN VALVE BETWEEN SAID LIQUID PRESSURE CHAMBER AND THE PART OF SAID PASSAGE MEANS BETWEEN SAID FLUID PRESSURE SUPPLY MEANS AND SAID LIQUID PRESSURE CHAMBER TO PERMIT LIQUID TO FLOW FROM SAID FLUID PRESSURE SUPPLY MEANS INTO SAID LIQUID PRESSURE CHAMBER BUT NOT OUT OF SAID LIQUID PRESSURE CHAMBER TOWARDS SAID FLUID PRESSURE SUPPLY MEANS, WHILE OPEN PASSAGE MEANS CONTINUOUTSLY CONNECT SAID LIQUID PRESSURE CHAMBER OF SAID HYDRAULIC ACCUMULATOR TO SAID SUBSIDIARY WORKING CYLINDER, RELIEF PASSAGE MEANS, AND VALVE MEANS OPERATING TO CONNECT SAID WORKING CHAMBER OF LARGE CROSS-SECTIONAL AREA ALTERNATELY TO SAID FLUID PRESSURE SUPPLY MEANS AND TO SAID RELIEF PASSAGE MEANS.