Coil positioning control

Claim 1

A PRESSURE CONTROL FOR A HYDRAULIC CYLINDER LIMITED BY THE PRESENT LOAD ON THE CYLINDER COMPRISING, VALVE MEANS TO CHARGE SAID CYLINDER WITH A HYDRAULIC PRESSURE AT A PREDETERMINED RATE SUFFICIENTLY TO MOVE SAID LOAD, A MEMORY ACCUMULATOR CONNECTED TO RECEIVE A HYDRAULIC PRESSURE CORRELATED WITH THE HYDRAULIC PRESSURE APPLIED TO THE CYLINDER TO MOVE THE LOAD, A SECOND VALVE MEANS TO CHARGE SAID CYLINDER WHEN SAID FIRST VALVE MEANS IS SHUT OFF AND SAID MEMORY ACCUMULATOR IS ISOLATED FROM SAID CYLINDER, SAID SECOND VALVE MEANS ADDING A CHARGE TO SAID CYLINDER AT A REDUCED RATE AND AT AN ADDITIONAL HYDRAULIC PRESSURE WHILE SAID MEMORY ACCUMULATOR REMAINS ISOLATED, A PRESSURE CONTROL MEANS HAVING PISTON MEANS OPERATING IN OPPOSED PRESSURE CHAMBERS AND A CYLINDER DISCHARGE PORT CONTROLLED BY SAID PISTON MEANS, THE FIRST OF SAID PRESSURE CHAMBERS SUBJECTED TO THE PRESSURE OF SAID MEMORY ACCUMULATOR AND THE SECOND OF SAID PRESSURE CHAMBERS SUBJECTED TO SAID ADDITIONAL HYDRAULIC PRESSURE TO ACTUATE SAID PISTON MEANS AND ALLEVIATE THE LATTER HYDRAULIC PRESSURE THROUGH SAID DISCHARGE PORT WHEN THIS HYDRAULIC PRESSURE ON THE CYLINDER EXCEEDS A PREDETERMINED PRESSURE ABOVE THE ORIGINAL PRESSURE APPLIED TO SAID CYLINDER BY SAID FIRST VALVE MEANS TO BALANCE THE LOAD.