Method and means for ensuring the shifting with reference to a stationary body of a movable body subjected to a variable external force

Claim 1

APPARATUS FOR MAINTAINING A CONSTANT DISTANCE BETWEEN A MOVABLE BODY RELATIVE TO A STATIONARY BODY WHEN AN OUTER VARIABLE FORCE IS EXERTED ON SAID MOVABLE BODY, SAID APPARATUS COMPRISING A CONTROL MECHANISM CARRIED BY SAID STATIONARY BODY AND MOVABLE RELATIVE TO SAID MOVABLE BODY, ONE END OF SAID CONTROL MECHANISM DISPOSED WITHIN AND SPACED FROM SAID MOVABLE BODY, A SOURCE OF SUPPLY OF FLUID UNDER PRESSURE, CONDUIT MEANS IN SAID MOVABLE BODY CONNECTED WITH SAID SOURCE OF SUPPLY, AT LEAST ONE PRIMARY CHAMBER BETWEEN ADJACENT WALLS OF THE TWO BODIES AND ADAPTED TO BE FED WITH FLUID UNDER PRESSURE FROM SAID SOURCE OF SUPPLY, THE FLUID UNDER PRESSURE BEING CONTROLLED BY MOVEMENT OF THE END OF SAID CONTROL MECHANISM, AUXILIARY CONTROL MEANS INCLUDING A CORRECTING MEMBER SLIDABLY MOUNTED IN SAID MOVABLE BODY DISPOSED BETWEEN SAID CONDUIT MEANS AND SAID PRIMARY CHAMBER AND OPPOSITE THE END OF SAID CONTROL MECHANISM, SAID CORRECTING MEMBER ADJUSTING THE PRESSURE OF FLUID IN SAID PRIMARY CHAMBER AND PROVIDING A COMPENSATING MOVEMENT RELATIVE TO SAID MOVABLE BODY WHEREBY IT MOVES NEARER TO OR AWAY FROM AN ADJACENT WALL OF SAID MOVABLE BODY BY AN AMOUNT EQUAL TO THAT BY WHICH IT MOVES NEARER TO OR AWAY FROM THE END OF SAID CONTROL MECHANISM, SAID AUXILIARY CONTROL MEANS FURTHER INCLUDING AN INTERMEDIATE CHAMBER FORMED BY THE BODY OF SAID CORRECTING MEMBER, THE UPPER END OF SAID CORRECTING MEMBER BEING OF GREATER DIAMETER THAN THE BODY THEREOF AND DISPOSED ADJACENT THE SURFACE OF THE END OF SAID CONTROL MECHANISM TO PROVIDE AN INLET PORT OF VARYING CROSS SECTION FOR PASSAGE OF THE FLUID UNDER PRESSURE INTO SAID INTERMEDIATE CHAMBER, AND AN OUTLET PORT OF FIXED CROSS SECTION COMMUNICATING WITH A VENT OPENING IN SAID MOVABLE BODY.