Pressure responsive device

Claim 1

IN A SERVO DEVICE INCLUDING A LONG-STROKE PRESSUREOPERATED MOTOR HAVING A CHAMBER AND A MEMBER, WHEREIN SAID MEMBER IS MOVABLE IN A STRAIGHT LINE IN RESPONSE TO FORCE DUE TO ADMISSION OF FLUID PRESSURE TO SAID CHAMBER, AND INCLUDING MEANS FOR ADMITTING FLUID UNDER PRESSURE TO SAID CHAMBER, A NOZZLE CONNECTED TO SAID CHAMBER FOR ALLOWING FLUID UNDER PRESSURE TO ESCAPE FROM SAID CHAMBER; A BAFFLE FOR THROTTLING FLOW OF FLUID OUT OF SAID NOZZLE, SAID NOZZLE BEING EFFECTIVELY PART OF SAID MEMBER AND OPENING IN THE DIRECTION OF SAID LINE, SAID BAFFLE BEING PIVOTED ON SAID MEMBER AND EXTENDING IN FRONT OF SAID NOZZLE, THE ARRANGEMENT BEING THAT SAID BAFFLE IS PIVOTABLE TOWARD AND AWAY FROM SAID NOZZLE TO RESPECTIVELY OBSTRUCT AND FREELY PERMIT FREE FLOW OF FLUID FROM SAID NOZZLE; MEANS BIASING THE SAID MEMBER ALONG SAID LINE IN THE DIRECTIONOF SAID BAFFLE, SAID BIAS MEANS BEING CONSTRUCTED AND ARRANGED SUCH THAT IF FLUID PRESSURE BE ADMITTED TO SAID CHAMBER, AND SAID NOZZLE BE THROTTLED, SAID MEMBER WILL MOVE IN THE DIRECTION OPPOSITE TO THE LAST SAID DIRECTION; A BAFFLE ACTUATOR AND A LEVER, SAID ACTUATOR BEING FIXED TO ONE PART OF SAID LEVER AND SAID LEVER BEING PIVOTED TO A FIXED POINT FOR ANGULAR MOVEMENT OF SAID ACTUATOR IN A PLANE CONTAINING SAID LINE, CONDITION RESPONSIVE MEANS MOVING SAID LEVER TO ANGULAR POSITIONS REPRESENTATIVE OF SAID CONDITION, SAID BAFFLE HAVING A PLANE-SURFACED PORTION EXTENDING ACROSS THE PATH OF SAID ACTUATOR AND SAID PORTION BEING IN CONTACT WITH SAID ACTUATOR, SAID ACTUATOR HAVING A SPHERICAL SURFACE NEXT ADJACENT SAID PLANE-SURFACED PORTION AND TANGENT THERETO, SAID LVER, SAID BAFFLE, SAID ACTUATOR AND SAID MEMBER BEING SO PROPORTIONED AND ORIENTED THAT THE CENTER OF CURVATURE OF SAID SPHERICAL SURFACE AND THE PIVOT AXIS OF SAID LEVER BOTH LIE IN A PLANE NORMAL TO SAID STRAIGHT LINE FOR ONE VALUE OF SAID CONDITION, SAID NOZZLE BEING POSITIONED AT JUST SUFFICIENT DISTANCE FROM SAID BAFFLE THAT SAID BAFFLE ALLOWS JUST ENOUGH FLUID TO ESCAPE FROM SAID NOZZLE THAT THE SAID BIAS MEANS PREVENTS MOTION OF SAID MEMBER AWAY FROM SAID BAFFLE, WHEREAS THE FORCE ON SAID MEMBER DUE TO FLUID PRESSURE IN SAID CHAMBER IS SUFFICIENT TO PREVENT SAID BIAS MEANS FROM MOVING SAID MEMBER TOWARD SAID BAFFLE.