Device for controlling rate of engagement of hydraulic clutch

Claim 1

IN A TRANSMISSION, A ROTATABLE CLUTCH DRUM, AN ENGAGEABLE AND RELEASABLE CLUTCH, FLUID PRESSURE RESPONSIVE MEANS FOR ENGAGING AND RELEASING SAID CLUTCH FORMING WITH SAID DRUM A CHAMBER ADAPTED TO RECEIVE FLUID UNDER PRESSURE TO ENGAGE SAID CLUTCH, A FLUID PRESSURE SOURCE, A VALVE CONNECTED TO SAID SOURCE FOR CONTROLLING ADMISSION OF PRESSURE TO AND EXHAUST OF PRESSURE FROM SAID CHAMBER PASSAGE MEANS CONNECTING SAID VALVE TO SAID CHAMBER INCLUDING FIRST AND SECOND PASSAGES IN SAID DRUM, A FIXED RESTRICTION IN SAID FIRST PASSAGE FOR RESTRICTING FLUID FLOW TO SAID CHAMBER UPON ADMISSION OF FLUID PRESSURE TO SAID PASSAGE, A SECOND VALVE IN SAID SECOND DRUM PASSAGE MOVABLE IN RESPONSE BOTH TO CONTRIFUGAL FORCE AND TO FLUID PRESSURE ADMITTED TO SAID SECOND PASSAGE TO PERMIT UNRESTRICTED FLUID FLOW TO SAID CHAMBER, SAID SECOND VALVE BEING MOVABLE IN RESPONSE TO PRESSURE RISE IN SAID CHAMBER TO BLOCK OFF FLUID FLOW TO SAID CHAMBER THROUGH SAID SECOND PASSAGE.