Automatic transmission control circuit

Claim 1

IN AN AUTOMATIC POWER TRANSMISSION MECHANISM HAVING A POWER INPUT DRIVING PORTION, A POWER OUTPUT DRIVEN PORTION, AND A PLURALITY OF GEAR ELEMENTS INTERCONNECTING SAID DRIVING AND DRIVEN PORTIONS; A GEAR CONTROL MEANS FOR REGULATING RELATIVE MOVEMENT BETWEEN SAID GEAR ELEMENTS TO ACCOMMODATE A DELIVERY OF TORQUE THERETHROUGH AT VARIOUS TORQUE RATIONS, SAID GEAR CONTROL MEANS INCLUDING A DOUBLE ACTING FLUID PRESSURE RESPONSIVE SERVO ADAPTED TO ACTUATE THE SAME, SAID SERVO HAVING A SERVO PRESSURE RELEASE CHAMBER AND A SERVO PRESSURE APPLY CHAMBER, A FLUID PRESSURE SOURCE,A CONTROL VALVE CIRCUIT INCLUDING A SEPARATE FLUID PRESSURE PASSAGE INTERCONNECTING SAID FLUID PRESSURE SOURCE AND EACH OF SAID SERVO CHAMBERS, AND AN ACCUMULATOR COMPRISING A FLUID CHAMBER, A MOVABLE MEMBER SITUATED IN SAID CHAMBER DEFINING SEPARATE ACCUMULATOR PORTIONS ON EITHER SIDE THEREOF, A FIRST BRANCH PASSAGE CONNECTING ONE ACCUMULATOR PORTION WITH SAID PRESSURE SOURCE TO PROVIDE DIRECT AND CONTINUOUS FLUID COMMUNICATION THEREBETWEEN AND A SECOND BRANCH PASSAGE CONNECTING CONTINUOUSLY THE OTHER ACCUMULATOR PORTION WITH ONE PRESSURE CHAMBER OF SAID SERVO, AND VALVE MEANS DISPOSED IN AND PARTLY DEFINING SAID SECOND BRANCH PASSAGE FOR DISTRIBUTING PRESSURE SELECTIVLY TO SAID ONE PRESSURE CHAMBER.