Hydraulic transmission control

Claim 1

IN A TRANSMISSION HYDRAULIC CONTROL SYSTEM INCLUDING MODULATED FLUID UNDER PRESSURE DELIVERED TO A SPEED CLUTCH SYSTEM THE COMBINATION COMPRISING A VALVE HOUSING, A VALVE SPOOL SLIDABLY RESIDING IN SAID HOUSING AND FORMING AN ORIFICE THEREWITH, THE FLUID UNDER PRESSURE COMMUNICATING WITH ONE SIDE OF SAID ORIFICE, A DIRECTIONAL CLUTCH SYSTEM COMMUNICATING WITH THE OTHER SIDE OF SAID ORIFICE, MOVEMENT OF SAID SPOOL RELATIVE TO SAID HOUSING VARYING THE AREA OF SAID ORIFICE, A PISTON ADJACENT ONE END OF SAID SPOOL AND SLIDABLY MAINTAINED IN A PISTON CHAMBER IN SAID HOUSING, SAID SPOOL HAVING A CENTRAL BORE IN ITS OTHER END, SAID BORE COMMUNICATING WITH THE SIDE OF SAID ORIFICE WHICH COMMUNICATES WITH SAID DIRECTIONAL CLUTCH SYSTEM WHEREBY FLUID ENTERING SAID BORE INDUCES MOVEMENT OF SAID SPOOL RELATIVE TO SAID HOUSING, A VALVE SPRING OPPOSING THE MOTION INDUCED BY FLUID IN SAID BORE, A POPPET VALVE COMMUNICATING WITH SAID PISTON CHAMBER, SAID MODULATED FLUID COMMUNICATING WITH SAID POPPET VALVE WHEREBY FLUID ENTERS SAID PISTON CHAMBER AND INDUCES MOVEMENT OF SAID VALVE SPOOL IN OPPOSITION TO THE MOVEMENT INDUCED BY THE PRESSURE IN SAID BORE, MOVEMENT BY PRESSURE IN SAID BORE OPERATIVE TO REDUCE THE AREA OF SAID ORIFICE WHILE MOVEMENT IN OPPOSITION THERETO IS OPERATIVE TO INCREASE THE AREA OF SAID ORIFICE.