Automatic control valve system for a multiple speed-ratio power transmission system

Claim 1

IN AN AUTOMATIC POWER TRANSMISSION SYSTEM HAVING GEAR ELEMENTS ADAPTED TO FORM A DRIVING CONNECTION BETWEEN A DRIVING MEMBER AND A DRIVEN MEMBER, MEANS INCLUDING A FLUID FRICTION TORQUE ESTABLISHING DEVICE FOR CONTROLLING THE RELATIVE MOTION OF THE GEAR ELEMENTS OF SAID SYSTEM TO ESTABLISH SPEED-RATIO CHANGES, A FLUID PRESSURE OPERATED SERVO CONNECTED TO A PRESSURE OPERATED PART OF SAID FRICTION TORQUE ESTABLISHING DEVICE FOR ACTUATING THE SAME, A FLUID PRESSURE SOURCE, CONDUIT STRUCTURE INTERCONNECTING SAID SOURCE AND SAID SERVO, FLUID PRESSURE REGULATOR VALVE MEAN IN SAID CONDUIT STRUCTURE FOR MAINTAINING A CONTROLLED, EFFECTIVE PRESSURE IN SAID CONDUIT STRUCTURE AND AN ACCUMULATOR VALVE SYSTEM ADAPTED TO CUSHION THE RATE OF APPLICATION OF SAID SERVO AS FLUID PRESSURE IS DISTRIBUTED THERETO, SAID ACCUMULATOR VALVE SYSTEM COMPRISING A PRESSURE REGULATOR VALVE MEANS FOR VARYING THE MAGNITUDE OF THE PRESSURE MADE AVAILABLE TO SAID SERVO, A MODIFIER VALVE MEANS FOR CHANGING THE PRESSURE REGULAT-