Power shift assist mechanism for clutches

Claim 1

IN A TRANSMISSION HAVING A CLUTCH MEMBER ADAPTED TO BE SELECTIVELY MOVED IN OPPOSITE DIRECTIONS FROM A NEUTRAL POSITION TO ESTABLISH DIFFERENT TRANSMISSION DRIVE RATIOS, HOUSING A SHIFT RAIL IN SAID HOUSING, A SHIFTER FORK FIXED TO SAID RAIL AND OPERABLY CONNECTED TO SAID CLUTCH MEMBER, A FLUID PRESSURE RESPONSIVE SERVO MEMBER FIXED TO SAID SHAFT RAIL, CONTROL CHAMBERS AT OPPOSITE SIDES OF SAID SERVO MEMBER, A ROTATABLE SHAFT SUPPORTED FOR ROTATION IN SAID HOUSING, A SHIFT FINGER FIXED TO SAID SAHFT, YIELDABLE MEANS CONNECTING SAID SHIFT FINGER TO SAID YOKE AND NORMALLY EFFECTIVE TO POSITION SAID SHIFT FINGER IN A PREDETERMINED POSITION WITH RESPECT TO SAID YOKE, SECOND YIELDABLE MEANS FOR OPPOSING MOTION OF SAID SHIFT RAIL UPON INITIAL ROTATION OF SAID SHAFT, A FIRST VALVE MEMBER FIXED TO SID SHAFT RAIL FOR MOVEMENT WITH SAID RAIL, A SECOND VALVE MEMBER MOVABLE WITH RESPECT TO SAID FIRST VALVE MEMBER, A VALVE CONTROL FINGER FIXED TO SAID SHAFT, MEANS CONNECTING SAID SECOND VALVE MEMBER TO SAID SHIFT FINGER, PASSAGES V CONNECTING SAID CONTROL CHAMBERS, RESPECTIVELY TO SAID FIRST VALVE, MEMBER, A FLUID PRESSURE SOURCE CONNECTED TO SAID SECOND VALVE MEMBER, SAID SECOND VALVE MEMBER BEING EFFECTIVE WHEN SAID SHIFT FINGER IS DISPOSED IN SAID PREDETERMINED POSITION TO CONNECT BOTH OF SAID CONTROL CLAMBERS TO EXHAUST, SAID VALVE CONTROL FINGER BEING MOVABLE UPON INITIAL ROTATION OF SAID SHAFT TO DISPLACE SAID SECOND VALVE MEMBER WITH RESPECT TO SAID FIRST VALVE MEMBER TO SELECTIVELY CONNECT ONE OR THE OTHER OF SAID CONTROL CHAMBERS TO PRESSURE SOURCE, AND SAID FIRST VALVE MEMBER BEING MOVABLE BY SAID SHIFT RAIL TO RENDER SAID SECOND VALVE MEMBER EFFECTIVE TO CONNECT BOTH OF SAID CONTROL CHAMBERS TO EXHAUST UPON COMPLETION OF CHANGE OF TRANSMISSION DRIVE RATIO.