Automatic hydraulic engine timing device

Claim 1

A MEANS TO ADJUST THE ANGULAR PHASE RELATIONSHIP BETWEEN ROTARY DRIVING AND DRIVEN PARTS IN AN ENGINE TIMING TRAIN WHICH COMPRISES A COUPLING ELEMENT SLIDABLY CONNECTED TO BOTH PARTS AND HAVING A HELICAL SPLINE CONNECTION WITH ONE PART TO VARY THE ANGULAR PHASE UPON SLIDING ADJUSTMENT THEREOF, SUCH PARTS BEING RECESSED TO RECEIVE AND CONFINE SAID COUPLING ELEMENT FOR SLIDING ADJUSTMENT, MEANS TO DIRECT FLUID UNDER PRESSURE TO ONE END OF THE CONFINING RECESS, NORMALLY OPEN VALVE MEANS RELIEVING FLUID PRESSURE FROM SAID END, FLYWEIGHTS CARRIED BY ONE OF SAID ROTATING PARTS TO CLOSE SAID VALVE MEANS UPON INCREASE IN ROTARY SPEED TO ENTRAP PRESSURE AT SAID END AND EFFECT SLIDING OF SAID COUPLING ELEMENT AWAY FROM A NORMAL SLOW SPEED POSITION, RESILIENT MEANS OPPOSING ACTION OF THE FLYWEIGHTS AND TENDING TO RETURN THE COUPLING TO NORMAL, A SECOND RESILIENT MEANS TENDING TO RETURN THE COUPLING TO NORMAL, AND MEANS TO DAMP THE RETURN MOVEMENT OF SAID COUPLING, THE DAMPENING MEANS INCLUDING MEANS TO TRAP FLUID WHICH ACTUATES THE COUPLING AND FORCE IT THROUGH INTERSTICES OF THE HELICAL SPLINE.