Hydraulically actuated controller

Claim 1

A CONTROLLER COMPRISING, SENSING MEANS EXPOSED TO AN EXTERNAL VARIABLE FORCE, CONTROL MEANS ACTUATABLE BY DISPLACEMENT THEREOF, AND INTERNAL TRANSMITTING MEANS OPERATIVELY CONNECTED TO THE SENSING MEANS AND CONTROL MEANS FOR DISPLACEMENT BY A PRESET AMOUNT IN ONE DIRECTION IN INSTANTANEOUS RESPONSE TO INCREASE OF THE EXTERNAL FORCE ON THE SENSING MEANS BEYOND ONE VALUE AND DISPLACEMENT BY SAID PRESET AMOUNT IN THE OPPOSITE DIRECTION INSTANEOUSLY UPON REDUCTION OF THE EXTERNAL FORCE BELOW A SECOND VALUE, SAID TRANSMITTING MEANS COMPRISING A PAIR OF SEPARATELY SEALED FLUID FILLED CHAMBERS INTERCONNECTED BY A PAIR OF FLOW PASSAGES, SAID CHAMBERS BEING RESPECTIVELY IN CONTACT WITH SAID EXTERNAL FORCE SENSING MEANS AND SAID CONTROL MEANS, AND FLOW BLOCKING VALVE MEANS OPERATIVELY DISPOSED IN SAID PAIR OF FLOW PASSAGES FOR DIRECTIONALLY BLOCKING FREE AND CONTINUOUS FLOW TO CAUSE SIMULTANEOUS DISPLACEMENT OF BOTH CHAMBERS BY SAID PRESET AMOUNTS IN INSTANTANEOUS RESPONSE ONLY TO A PREDETERMINED PRESSURE DIFFERENTIAL APPLIED TO THE VALVE MEANS BY FLUID IN SAID CHAMBERS, SAID VALVE MEANS COMPRISING A PAIR OF ADJUSTABLE OPPOSITELY DIRECTED SPRINGBIASED, ONE-WAY VALVES INTERCONNECTING SAID CHAMBERS.