Drive regulating mechanisms

Claim 1

IN A CONSTRUCTION INCLUDING A DRIVE MEMBER HAVING A DRIVE SHAFT ADAPTED TO RECIPROCATE IN A PRE-SET PATTERN BETWEEN FIRST AND SECOND POSITIONS, AND A DRIVEN MEMBER ADAPTED TO BE MOVED BY SAID DRIVE MEMBER BETWEEN FIRST AND SECOND POSITIONS, THE IMPROVEMENT COMPRISING HYDRAULIC COUPLING MEANS ADAPTED TO REGULATE THE EXTENT OF THE IMPROVEMENTS IMPARTED TO SAID DRIVEN MEMBER, SAID COUPLING MEANS INCLUDING A FIRST PISTON CONNECTED TO SAID DRIVE SHAFT, A CYLINDER FOR HOLDING HYDRAULIC FLUID, A SECOND PISTON CONNECTED TO SAID DRIVEN MEMBER AND MEANS COMMUNICATING SAID CYLINDER WITH SAID SECOND PISTON WHEREBY MOVEMENT OF SAID FIRST PISTON CAN TRANSMIT CORRESPONDING MOVEMENT TO SAID SECOND PISTON, FIRST AND SECOND OUTLET LINES ASSOCIATED WITH SAID CYLINDER, FIRST AND SECOND VALVE MEANS ASSOCIATED WITH THE RESPECTIVE OUTLET LINES, AN HYDRAULIC FLUID RESERVOIR IN COMMUNICATION WITH SAID OUTLET LINES, MEANS FOR OPERATING SAID FIRST VALVE MEANS AT A TIME INTERMEDIATE THE COMPLETION OF THE STROKE OF SAID FIRST PISTON AS IT MOVES FROM SAID FIRST POSITION TO SAID SECOND POSITION TO OPEN COMMUNICATION BETWEEN SAID CYLINDER AND SAID FIRST OUTLET LINE WHEREBY SAID FLUID CAN BE PASSED FROM SAID CYLINDER THROUGH SAID FIRST OUTLET LINE TO SAID RESERVOIR TO RELIEVE SAID PRESSURE OF SAID FLUID ON SAID SECOND PISTON AND TO THEREBY EFFECT STOPPING OF SAID SECOND PISTON BEFORE COMPLETION OF SAID STROKE, AND MEANS FOR OPERATING SAID SECOND VALVE MEANS AT A TIME INTERMEDIATE THE COMPLETION OF THE RETURN STROKE OF SAID FIRST PISTON TO OPEN COMMUNICATION BETWEEN SAID RESERVOIR AND SAID CYLINDER THROUGH SAID SECOND OUTLET LINE DURING SAID RETURN STROKE FOR RETURNING SAID FLUID TO SAID CYLINDER.